CN221860647U

CN221860647U - Magnetic resonance system and cooling system for a magnetic resonance system

Info

Publication number: CN221860647U
Application number: CN202323117477.1U
Authority: CN
Inventors: 刘海亮; 张存礼; 威廉姆·博诺; 董怀宇; 胡刚; 张旭
Original assignee: GE Precision Healthcare LLC
Current assignee: GE Precision Healthcare LLC
Priority date: 2023-11-17
Filing date: 2023-11-17
Publication date: 2024-10-18
Anticipated expiration: 2033-11-17

Abstract

The utility model provides a magnetic resonance system and a cooling system for a magnetic resonance system, the cooling system comprising: a first fluid circuit and a second fluid circuit. The first fluid circuit is coupled to a thermal load of the magnetic resonance system. The second fluid circuit includes an indoor heat exchange module and an outdoor heat exchange module, the indoor heat exchange module being in communication with the outdoor heat exchange module. The second fluid circuit exchanges heat with outdoor air via the outdoor heat exchange module and exchanges heat with the first fluid circuit via the indoor heat exchange module.

Description

Magnetic resonance system and cooling system for a magnetic resonance system

Technical Field

The present utility model relates to the field of medical imaging, and in particular to a Magnetic Resonance (MR) system and a cooling system for a MR system.

Background

Magnetic resonance systems typically include a water cooling system that can cool various thermal loads of the magnetic resonance system to ensure proper operation of the heat generating components. The thermal load typically includes high power electronics such as gradient coils, gradient drivers, radio frequency power amplifiers, and the like, as well as compressor assemblies dedicated to cooling the superconducting magnet, including helium compressor assemblies, which are more widely used.

The core components of the conventional water cooling system include a compressor assembly, which includes a fluorine compressor assembly in a relatively wide application, and in order to enable the superconducting magnet to be continuously in a superconducting state, the helium compressor assembly needs to be operated for 24 hours to provide a low-temperature environment for the superconducting magnet, so that the fluorine compressor assembly of the water cooling system also needs to be continuously operated to cool the helium compressor assembly. Therefore, the cooling capacity required for the water cooling system is very large, and accordingly, has very large energy consumption.

Disclosure of utility model

An aspect of the utility model provides a cooling system for a magnetic resonance system comprising a first fluid circuit and a second fluid circuit. The first fluid circuit is coupled to a thermal load of the magnetic resonance system. The second fluid circuit includes an indoor heat exchange module and an outdoor heat exchange module, the indoor heat exchange module being in communication with the outdoor heat exchange module. The second fluid circuit exchanges heat with outdoor air through the outdoor heat exchange module and exchanges heat with the first fluid circuit through the indoor heat exchange module.

In another aspect, the cooling system further includes a third fluid circuit, a cryogen cooling module, and a controller. The third fluid circuit includes the outdoor heat exchange module. The refrigerant cooling module is configured to exchange heat with the third fluid circuit to be cooled and configured to exchange heat with the first fluid circuit to cool the first fluid circuit. The controller is configured to selectively turn on the second fluid circuit or the third fluid circuit and the refrigerant cooling module based on an outdoor temperature.

In another aspect, the refrigerant cooling module includes a refrigerant circuit, a first fluid passage in heat exchange relationship with the refrigerant circuit, and a second fluid passage in heat exchange relationship with the refrigerant circuit; the third fluid circuit includes the outdoor heat exchange module and the first fluid passage, and the first fluid circuit includes the second fluid passage.

In another aspect, the cooling system further includes a switching valve for switching the second fluid circuit and the third fluid circuit, the controller selectively opening either the second fluid circuit or the third fluid circuit by operating the switching valve.

In another aspect, the second fluid circuit includes the first fluid passage of the cryogen cooling module.

In another aspect, the cooling system further comprises a switching valve comprising: a first end in communication with the outdoor heat exchange module, a second end in communication with the indoor heat exchange module, and a third end in communication with the first fluid passage of the refrigerant cooling module. The controller is used for controlling the first end of the switching valve to be communicated with the second end so as to open the second fluid loop, or controlling the first end of the switching valve to be communicated with the third end so as to selectively open the third fluid loop.

In another aspect, the fluid inlet of the outdoor heat exchange module is in communication with the fluid outlet of the first fluid passage, and a flow regulating module is connected between the fluid inlet of the outdoor heat exchange module and the fluid outlet of the first fluid passage, the controller being configured to operate the flow regulating module based on the outdoor temperature to control an amount of fluid flowing from the first fluid passage to the outdoor heat exchange module.

In another aspect, the flow regulating module is a fluid mixing valve comprising: a first end in communication with the fluid inlet of the outdoor heat exchange module, a second end in communication with the fluid outlet of the first fluid passage, and a third end in communication with the fluid outlet of the outdoor heat exchange module.

In another aspect, the refrigerant circuit includes an evaporator, a compressor, a condenser, and an expansion valve, wherein:

the condenser comprises: a first refrigerant channel for exchanging heat with the first fluid channel;

The evaporator comprises: a second refrigerant passage for exchanging heat with the second fluid passage;

Two ends of the compressor are respectively communicated with the refrigerant inlet of the first refrigerant channel and the refrigerant outlet of the second refrigerant channel;

the two ends of the expansion valve are respectively communicated with the refrigerant outlet of the first refrigerant channel and the refrigerant inlet of the second refrigerant channel.

In another aspect, the cooling system further includes an outdoor temperature detecting unit for transmitting the detected outdoor temperature to the controller.

In another aspect, the outdoor heat exchange module includes a fan for cooling fluid flowing through the outdoor heat exchange module.

In another aspect, the second fluid circuit includes a flow regulation module connected between the fluid outlet of the indoor heat exchange module and the fluid inlet of the outdoor heat exchange module, the controller being configured to operate the flow regulation module based on the outdoor temperature to control an amount of fluid flowing from the indoor heat exchange module to the outdoor heat exchange module.

In another aspect, the second fluid circuit includes a first switching valve and the third fluid circuit includes a second switching valve, the controller being configured to operate the first switching valve to open or close the second fluid circuit and to operate the second switching valve to open or close the third fluid circuit.

Another aspect of the utility model provides a cooling system for a magnetic resonance system including a first fluid circuit, a second fluid circuit, and a controller. The first fluid circuit is coupled to a thermal load of the magnetic resonance system. The second fluid circuit includes an indoor heat exchange module and an outdoor heat exchange module, the indoor heat exchange module being in communication with the outdoor heat exchange module. The second fluid circuit exchanges heat with outdoor air through the outdoor heat exchange module and exchanges heat with the first fluid circuit through the indoor heat exchange module. The controller is used for opening the second fluid circuit in a first preset time period and closing the second fluid circuit in a second preset time period.

Another aspect of the utility model provides a magnetic resonance system comprising a thermal load and a cooling system for the magnetic resonance system of any of the above aspects.

It should be understood that the brief description above is provided to introduce in simplified form some concepts that are further described in the detailed description. It is not meant to identify key or essential features of the claimed subject matter, the scope of which is defined uniquely by the claims that follow the detailed description. Furthermore, the claimed subject matter is not limited to implementations that solve any disadvantages noted above or in any section of this disclosure.

Drawings

The utility model will be better understood by reading the following description of non-limiting embodiments, with reference to the attached drawings, in which:

figure 1 shows a schematic diagram of an exemplary magnetic resonance system in accordance with some embodiments;

FIG. 2 shows a schematic view of the superconducting magnet and its cooling arrangement of FIG. 1;

FIG. 3 illustrates one example of a prior art water cooling system;

Figure 4 shows a schematic diagram of a cooling system for a magnetic resonance system according to some embodiments of the present utility model;

Figure 5 shows a schematic view of a cooling system for a magnetic resonance system according to further embodiments of the present utility model;

Figure 6 shows a schematic diagram of a cooling system for a magnetic resonance system according to further embodiments of the present utility model;

Fig. 7 shows an operating state of the cooling system 600 when the outdoor temperature is low;

fig. 8 shows an operating state of the cooling system 600 when the outdoor temperature is high;

figure 9 shows a schematic diagram of a cooling system for a magnetic resonance system according to another embodiment of the present utility model.

The figures show the components described for a magnetic resonance system and a cooling system for a magnetic resonance system. The accompanying drawings illustrate and explain the structural principles, methods and principles described herein in connection with the following description. In the drawings, the thickness and size of the components may be exaggerated or otherwise modified for clarity. Well-known structures, materials, or operations are not shown or described in detail to avoid obscuring the described components, systems, and methods.

Detailed Description

In the following, specific embodiments of the present utility model will be described, and it should be noted that in the course of the detailed description of these embodiments, it is not possible in the present specification to describe all features of an actual embodiment in detail for the sake of brevity. It should be appreciated that in the actual implementation of any of the implementations, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another. Moreover, it should be appreciated that while such a development effort might be complex and lengthy, it would nevertheless be a routine undertaking of design, fabrication, or manufacture for those of ordinary skill having the benefit of this disclosure, and thus should not be construed as having the benefit of this disclosure.

Unless defined otherwise, technical or scientific terms used in the claims and specification should be given the ordinary meaning as understood by one of ordinary skill in the art. The terms "first," "second," and the like in the description and in the claims, are not used for any order, quantity, or importance, but are used for distinguishing between different elements. The terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, is intended to mean that elements or items that are immediately preceding the word "comprising" or "comprising", are included in the word "comprising" or "comprising", and equivalents thereof, without excluding other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, nor to direct or indirect connections. Furthermore, it should be appreciated that references to "one embodiment" or "an embodiment" of the present utility model are not intended to be interpreted as excluding the existence of additional embodiments that also incorporate the recited features.

Referring to fig. 1, a schematic diagram of an exemplary MR (Magnetic Resonance) magnetic resonance system 100 is shown, in accordance with some embodiments. The operation of the magnetic resonance system 100 is controlled by an operator workstation 110, which operator workstation 110 comprises an input device 114, a control panel 116 and a display 118. The input device 114 may be a joystick, keyboard, mouse, trackball, touch activated screen, voice control, or any similar or equivalent input device. The control panel 116 may include a keyboard, touch-activated screen, voice control, buttons, sliders, or any similar or equivalent control device. The operator workstation 110 is coupled to and communicates with a computer system 120 that enables an operator to control the generation and viewing of images on the display 118. Computer system 120 includes a plurality of components that communicate with each other via electrical and/or data connection modules 122. The connection module 122 may be a direct wired connection, a fiber optic connection, a wireless communication link, or the like. Computer system 120 may include a Central Processing Unit (CPU) 124, a memory 126, and an image processor 128. In some embodiments, image processor 128 may be replaced by image processing functions implemented in CPU 124. Computer system 120 may be connected to an archive media device, permanent or backup storage, or a network. The computer system 120 may be coupled to and in communication with a separate Magnetic Resonance Imaging (MRI) system controller 130.

The MRI system controller 130 includes a set of components that communicate with each other via electrical and/or data connection modules 132. The connection module 132 may be a direct wired connection, a fiber optic connection, a wireless communication link, or the like. MRI system controller 130 may include a CPU 131, a sequence pulse generator 133 in communication with operator workstation 110, a transceiver (or RF transceiver) 135, a memory 137, and an array processor 139. In some embodiments, the sequence pulse generator 133 may be integrated into the magnetic resonance component 140 of the magnetic resonance system 100.

The MR scanned subject 170 may be positioned within the cylindrical imaging volume 146 of the magnetic resonance assembly 140 via a scan couch, which is controlled by the MRI system controller 130 to travel in the Z-axis direction of the magnetic resonance system to deliver the subject 170 into the imaging volume 146. The magnetic resonance assembly 140 includes a superconducting magnet body 143 having superconducting coils 144, a radio frequency coil assembly, and a gradient coil assembly 142. The superconducting coil 144 has magnet bores to form the cylindrical imaging volume 146. The superconducting coil 144, in operation, provides a static uniform longitudinal magnetic field B ₀ throughout the cylindrical imaging volume 146. The radio frequency coil assembly may include a body coil 148 and a surface coil 149, which may be used to transmit and/or receive radio frequency signals.

The MRI system controller 130 may receive commands from the operator workstation 110 to indicate MR scan sequences to be performed during an MR scan. The sequence pulse generator 133 of the MRI system controller 130 transmits instructions describing the timing, intensity and shape of the radio frequency pulses and gradient pulses in the sequence based on the indicated sequence to operate the system components that execute the sequence.

The radio frequency pulses in the scan sequence transmitted by the sequence pulse generator 133 may be generated via the transceiver 135 and amplified by the radio frequency power amplifier 162. The amplified radio frequency pulses are provided to the body coil 148 via a transmit/receive switch (T/R switch) 164, and the body coil 148 then provides a transverse magnetic field B ₁, which transverse magnetic field B ₁ is substantially perpendicular to B ₀ throughout the cylindrical imaging volume 146, and which transverse magnetic field B ₁ is used to excite excited nuclei (or protons) within the scanned subject to generate MR signals.

Gradient pulses in the scan sequence sent by the sequence pulse generator 133 may be generated via the gradient controller 136 and applied to the gradient driver system 150, which gradient driver system 150 includes G _x、G_y and G _z amplifiers, etc. Each of the G _x、G_y and G _z gradient amplifiers is used to excite a corresponding gradient coil in the gradient coil assembly 142 to generate a gradient magnetic field that is superimposed on the static magnetic field and to spatially encode the magnetic field gradients of the MR signals during the MR scan.

The components of the gradient driver system 150 may be powered by a gradient power supply 180.

The sequencer 133 is coupled to and in communication with a scan room interface system 145, which scan room interface system 145 receives signals from various sensors associated with the status of the magnetic resonance assembly 140. The scan room interface system 145 is also coupled to and in communication with a patient positioning system 147 that sends and receives signals to control the movement of the patient table to a desired position for MR scanning. In some embodiments, the scan room interface system 145 can include a wall-penetrating board (not shown) disposed between the scan room and the equipment room.

The transceiver 135 in the MRI system controller 130 generates RF excitation pulses that are amplified by a radio frequency power amplifier 162 and provided to the body coil 148 through a transmit/receive switch (T/R switch) 164. The body coil 148 and the surface coil 149 may be configured to operate in transmit and receive modes, transmit mode, or receive mode.

As described above, the body coil 148 and the RF surface coil 149 may be used to transmit RF excitation pulses and/or to receive resulting MR signals from a patient undergoing an MR scan. MR signals emitted by excited nuclei within the patient of the MR scan may be sensed and received by the body coil 148 or the surface coil 149 and sent back to the preamplifier 166 through the T/R switch 164. The T/R switch 164 may be controlled by a signal from the sequence pulse generator 133 to electrically connect the radio frequency power amplifier 162 to the body coil 148 during a transmit mode and to connect the preamplifier 166 to the body coil 148 during a receive mode. The T/R switch 164 may also enable the surface coil 149 to be used in either a transmit mode or a receive mode.

In some embodiments, the MR signals sensed and received by the body coil 148 or RF surface coil 149 and amplified by the pre-amplifier 166 are demodulated, filtered, and digitized in the receive portion of the transceiver 135 and stored as an array of raw image data in the memory 137 for post-processing. A reconstructed magnetic resonance image may be acquired by transforming/processing the stored raw image data.

In some embodiments, the MR signals sensed and received by the body coil 148 or RF surface coil 149 and amplified by the pre-amplifier 166 are demodulated, filtered, and digitized in the receive portion of the transceiver 135 and transferred to the memory 137 in the MRI system controller 130. For each image to be reconstructed, the data is rearranged into separate arrays of image data, and each of these separate arrays of image data is input to an array processor 139 that is operative to fourier transform the data into an array of image data.

The array processor 139 uses a transformation method, most commonly a fourier transform, to create an image from the received MR signals. These images are transferred to computer system 120 and stored in memory 126. In response to commands received from the operator workstation 110, the image data may be stored in long term memory or may be further processed by the image processor 128 and transferred to the operator workstation 110 for presentation on the display 118.

The magnetic resonance system 100 may further comprise a cooling device 200 for cooling the superconducting magnet, as will be described in detail below in connection with fig. 2.

Referring to fig. 2, the superconducting magnet includes a superconducting magnet body 143 and a superconducting coil 144 wound on the superconducting magnet body 143, the superconducting coil 144 is used to generate a main magnetic field, and the superconducting coil 144 needs to be cooled to a superconducting state to maintain a required main magnetic field strength, for which purpose, the superconducting coil 144 is immersed in a cryogenic container 210 for containing a cryogenic cryogen, such as liquid helium, in particular, the cryogenic container 210 may surround the superconducting magnet body 143. In addition to being immersed in a cryogenic vessel, superconducting coil 144 may be heat exchanged with a cryogenic cryogen in other ways to achieve a desired temperature. The cryogen vessel 210 may be disposed within a thermal shield 220, and a vacuum shielding region may be provided between the thermal shield 220 and the cryogen vessel 210, the thermal shield 220 and the vacuum shielding region isolating the cryogen from an external heat source, thereby avoiding volatilization of the cryogen.

The cooling device 200 also includes a refrigerant compressor 230, which may be, for example, a helium compressor. The refrigerant compressor 230 is configured to compress a gaseous refrigerant, and the compressed gaseous refrigerant is cooled by the refrigerant line 240, and then becomes a liquid state and circulates to the cryogenic container 210 to cool the superconducting coil 144 in the cryogenic container 210, and the refrigerant line 240 may include a cold head 241, for example. In the cryogen vessel 210, part of the liquid cryogen is re-turned into gaseous cryogen due to the heat of the heat load of adsorption, which can be circulated back into the cryogen compressor 230 via loop 250 for recompression.

It should be appreciated that the magnetic resonance system 100 and the cooling device 200 therein described above are for illustration only and may include more, fewer and/or different components, respectively.

In the working process of the magnetic resonance system, volatilization of the low-temperature refrigerant should be avoided, on one hand, the volatilization of the refrigerant can lead to quench of the superconducting magnet, and great cost is generated when excitation is performed again, on the other hand, the low-temperature refrigerant is relatively expensive, the volatilization can lead to great cost waste, and safety problems can also be caused. Thus, it is necessary to rely on the cooling device 200 to continuously provide the low temperature environment required for the superconducting coil, which is necessary to ensure that the cooling device 200 is continuously operating normally, and when the cooling device 200 or some of the components thereof are overheated, it may not be operating normally to cause quench, and thus, further cooling of the cooling device 200 is necessary.

One or more components of the magnetic resonance system 100 are referred to as heat generating components or thermal loads, which may include, for example, one or more of the above-described gradient driver system 150, gradient power supply 180, radio frequency power amplifier 162, T/R switch 164, MRI system controller 130, etc., and one or more components of the cooling device 200 as described above.

Fig. 3 shows an example of a conventional water cooling system 300 for cooling one or more heat loads as described above, the water cooling system 300 comprising a water cooling unit 310 integrally provided outdoors and a cooling line 320 provided indoors, the cooling line 320 comprising a heat exchange assembly comprising a first channel 321 and a second channel 322 for exchanging heat, the first channel 321 being in communication with the water cooling unit 310 via a pipe connection 330 to form a first circuit, the second channel 322 being coupled to a pipe 350 via a pipe connection 340 to form a second circuit, the pipe 350 being for coupling with one or more heat loads, for example for absorbing heat emitted by the heat loads by approaching or contacting the heat loads. The outdoor water chiller 310 includes a refrigerant assembly 312, the refrigerant assembly 312 is configured to form a refrigerant (e.g., freon) loop to exchange heat with the first loop to cool water in the first loop, and cold water in the first loop is configured to exchange heat with hot water flowing through the heat load in the second loop to cool the hot water, and the refrigerant assembly 312 generally continues to operate to meet heat dissipation requirements and thus consume a relatively large amount of energy. In addition, the refrigerant assembly 312 typically needs to be located outdoors to integrate with the outdoor air cooling device (e.g., fan), making the outdoor water cooling unit particularly bulky and therefore subject to stringent site requirements, and to ensure safety, requires professional qualification personnel to be able to install, maintain, repair, etc. the freon cooling device, which results in significant costs and maintenance efficiency.

The present utility model provides a cooling system of at least one embodiment having a portion coupled to one or more thermal loads for cooling the thermal loads. Referring to fig. 4, the cooling system 400 includes a first fluid circuit 410 and a second fluid circuit 420. The first fluid circuit 410 is coupled to the thermal load of the magnetic resonance system. The second fluid circuit 420 includes an indoor heat exchange module 421 and an outdoor heat exchange module 425, the indoor heat exchange module 421 and the outdoor heat exchange module 425 being in communication, the second fluid circuit 420 exchanging heat with outdoor air via the outdoor heat exchange module 425 and exchanging heat with the first fluid circuit 410 via the indoor heat exchange module 421.

The above "coupling" may include, but is not limited to, heat exchanging in contact with each other, in proximity to each other, in connection with each other, etc.

The term "communicating" as used herein means interconnecting to form a fluid path. In an embodiment of the present utility model, the indoor heat exchange module 421 and the outdoor heat exchange module 425 are communicated through a fluid pipeline 440, and the fluid pipeline 440 may include a plurality of parts connected in sequence, and two adjacent parts may be connected together through a pipeline connector 441 to form a fluid passage.

The indoor heat exchange module 421 is disposed indoors, and the outdoor heat exchange module 425 is disposed outdoors, and the "indoor" may be in a medical building, and in particular, the indoor heat exchange module 421 may be disposed between water cooling devices of the medical building. Accordingly, "outdoor" may be outside of a medical building.

Optionally, the cooling system 400 may further include a controller 430, and the controller 430 may turn on or off the second fluid circuit 420 based on the outdoor temperature.

In one example, the controller 430 turns on the second fluid circuit 420 when the outdoor temperature is low, the outdoor heat exchange module 425 in the second fluid circuit 420 cools the fluid in the circuit to a lower temperature using outdoor cold air, and the lower temperature fluid exchanges heat with the hotter fluid in the first fluid circuit 410 when flowing through the indoor heat exchange module 421, thereby cooling the hotter fluid in the first fluid circuit 410 to a temperature required for heat dissipation, without using a refrigerant cooling device (e.g., at least including a refrigerant compressor) for fluid cooling, and energy consumption is reduced.

In one embodiment, the controller 430 opens the second fluid circuit 420 when the outdoor temperature is less than or equal to a certain temperature; when the outdoor temperature is higher than the specific temperature, the controller 430 turns on the third fluid circuit. The specific temperature may be, for example, about 10 degrees.

In summary, the second fluid circuit may be opened when the outdoor temperature is low, and thus may be applied to winter, night or other periods of low temperature. Accordingly, the controller 430 may also be configured to open the second fluid circuit 420 for a first predetermined period of time and to close the second fluid circuit 420 for a second predetermined period of time. The first preset time period, the second preset time period may be determined based on a temperature prediction within the time period. For example, the first and second preset time periods may include a continuous plurality of hours, days, weeks, months, or seasons, respectively. However, when the magnetic resonance system is used in a low temperature place throughout the year, the second fluid circuit may be used all the time without being turned on or off based on the outdoor temperature, in which case the controller 430 may not be required.

In the embodiment of the utility model, the second fluid loop with the outdoor heat exchange part and the indoor heat exchange part is used for cooling the fluid in the first fluid loop by utilizing the heat exchange between the second fluid loop and the first fluid loop, so as to cool the thermal load coupled with the first fluid loop, the cold energy required by the cooling system is supplemented by using the outdoor cold air, and the first fluid loop is further cooled without exchanging heat with the refrigerant cooling module, so that the energy consumption is reduced.

Figure 5 shows a cooling system 500 for a magnetic resonance system according to another embodiment of the present utility model, wherein the first fluid circuit 410, the second fluid circuit 420 and the controller 430 are included, and wherein the cooling system 500 further comprises a cryogen cooling module 510 and a third fluid circuit 520. The third fluid circuit 520 comprises the outdoor heat exchange module 425, i.e. the outdoor heat exchange module 425 of the third fluid circuit 520 may be a heat exchange module shared with the second fluid circuit 420. In this embodiment, for convenience of description, a portion of the third fluid circuit 520 that is not shared with the second fluid circuit 420 is shown in fig. 5 by a dotted line. The second fluid circuit 420 and the third fluid circuit 520 may also share further fluid passages, as will be described below in connection with fig. 6.

The refrigerant cooling module 510 is configured to exchange heat with the third fluid circuit 520 and the first fluid circuit 410, respectively, wherein the refrigerant cooling module 510 exchanges heat with the third fluid circuit 520 to be cooled, and exchanges heat with the first fluid circuit 410 to cool the first fluid circuit 410. The controller 430 is configured to selectively turn on the second fluid circuit or turn on the third fluid circuit 520 and the refrigerant cooling module 510 based on an outdoor temperature.

The third fluid circuit 520 and the second fluid circuit 420 share the outdoor heat exchange module 425, when the controller 430 selects to turn on the third fluid circuit 520, the refrigerant cooling module 510 is turned on, the refrigerant cooling module 510 generates heat during operation, the fluid in the third fluid circuit 520 is cooled by the outdoor heat exchange module 425, and the third fluid circuit 520 further exchanges heat with the refrigerant cooling module 510 to cool the refrigerant cooling module 510, so that the refrigerant cooling module 510 can work normally. The refrigerant cooling module 510 generates cold energy when operating normally and transfers the cold energy to the first fluid circuit 410 when exchanging heat with the first fluid circuit 410, so that the fluid in the first fluid circuit 410, which is warmed by the thermal load, is cooled, and the cooled fluid is circulated back to the thermal load via the first fluid circuit 410 to cool the thermal load again, thus circulating.

In one example, the controller 430 turns on the third fluid circuit 520 when the outdoor temperature is high, and the refrigerant cooling module 510 is operated to generate a high heat to raise the temperature of the fluid flowing through the third fluid circuit to a high temperature, for example, about 60 degrees celsius, and the temperature of the fluid is lowered after the fluid flows through the outdoor heat exchange module 425, for example, about 40 degrees celsius, and the cooled fluid is circulated in the third fluid circuit back to the refrigerant cooling module 510 to raise the temperature after taking away the heat of the refrigerant cooling module 510, so that the circulation ensures that the refrigerant cooling module 510 is operated normally to generate the cooling capacity for cooling the first fluid circuit 410.

Figure 6 illustrates a cooling system 600 for a magnetic resonance system including a first fluid circuit 410, a second fluid circuit 420, a third fluid circuit 520, a cryogen cooling module 510, and a controller 430, in accordance with another embodiment of the present utility model, the third fluid circuit 520 and the second fluid circuit 420 sharing an outdoor heat exchange module 425, as described above. And further, the second fluid circuit 420 flows through the refrigerant cooling module 510, that is, when the refrigerant cooling module 510 is in a non-operating state, it is only used to circulate the fluid in the second fluid circuit 420, so that the third fluid circuit 520 and the second fluid circuit 420 also share more fluid channels, so as to save the configuration resources of the cooling system and reduce the cost.

As shown in fig. 6, the refrigerant cooling module 510 includes a refrigerant circuit 610, a first fluid passage 620 exchanging heat with the refrigerant circuit 610, and a second fluid passage 630 exchanging heat with the refrigerant circuit 610. The third fluid circuit 520 includes the first fluid passage 620 to cool the higher temperature refrigerant in the refrigerant circuit 610 through the first fluid passage 620. The first fluid circuit 410 includes the second fluid passage 630 to receive the cold generated from the refrigerant circuit 610 through the second fluid passage 630.

Specifically, the refrigerant circuit 610 includes an evaporator 611, a compressor 612, a condenser 613, and an expansion valve 614. The refrigerant circuit 610 is used for circulating a refrigerant, which may include, for example, a freon fluid, the freon fluid as a whole is compressed into a high-pressure gas via a compressor 612, the high-pressure gas is circulated to a condenser 613 to be condensed, heat is generated in the condensation process, and the condensed freon fluid is circulated to an expansion valve 614 to be depressurized, cooled, and depressurized, the freon fluid is circulated to an evaporator 611 and is evaporated into a gas in the evaporator 611, the heat is absorbed in the evaporation process, and the gas generated by the evaporation is circulated to the compressor 612 to be compressed, thus circulated.

The condenser 613 comprises a first refrigerant channel 616 for exchanging heat with the first fluid channel 620, the first fluid channel 620 may be arranged, for example, at one side (e.g. the outside) of the condenser 613, and the other side (e.g. the inside) of the condenser 613 is for circulating the refrigerant, thereby achieving heat exchange.

The evaporator 611 includes a second refrigerant channel 617 for exchanging heat with the second fluid channel 630, the second fluid channel 630 may be provided at one side (e.g., the outside) of the evaporator 611, for example, and the other side (e.g., the inside) of the evaporator 611 may be used for circulating the refrigerant, thereby achieving heat exchange.

Both ends of the compressor 612 are respectively connected to the refrigerant inlet of the first refrigerant passage 616 and the refrigerant outlet of the second refrigerant passage 617. Both ends of the expansion valve 614 are respectively connected to the refrigerant outlet of the first refrigerant passage 616 and the refrigerant inlet of the second refrigerant passage 617.

In an embodiment of the present utility model, the refrigerant cooling module 510 is a modular device independent of the outdoor heat exchange module 425, which may be disposed in a different space from the outdoor heat exchange module 425 and in communication through a pipe, for example, the refrigerant cooling module 510 may be placed indoors, and its volume may be small enough to be placed in a water-cooled cabinet between water-cooled devices. Specifically, the refrigerant cooling module 510 may be integrated with the first fluid channel 620 and the second fluid channel 630 to form a modular device, so that the modular device is directly operated during installation or replacement, and no refrigerant pipeline is required to be operated, thereby improving safety and convenience.

In some embodiments of the present utility model, a switching valve 680 is further included, the switching valve 680 is used to switch the third fluid circuit 520 and the second fluid circuit 420, in particular, the controller 430 selectively opens the second fluid circuit or the third fluid circuit by operating the switching valve 680, as shown in fig. 6, the second fluid circuit 420 and the third fluid circuit 520 share a part of the pipeline, and in embodiments of the present utility model, a common switching valve 680 may be provided, which is connected to the second fluid circuit 420 and the third fluid circuit 520 to switch therebetween.

Specifically, the switching valve 680 includes a first end 681, a second end 682, and a third end 683, wherein the first end 681 communicates with the outdoor heat exchange module 425, the second end 682 communicates with the indoor heat exchange module 421, and the third end 683 communicates with the first fluid passage 620 of the refrigerant cooling module 510. The controller 430 is configured to control the first end 681 of the switching valve 680 to communicate with the second end 682 or to communicate with the third end 683.

For ease of illustration, the portion of the second fluid circuit 420 that does not overlap the third fluid circuit 520 is shown in phantom in fig. 6.

Fig. 7 shows an operating state of the cooling system 600 when the outdoor temperature is low, wherein the flow direction of the fluid is shown by arrows on the fluid path. For ease of description, fig. 7 and fig. 8, which will be described below, represent portions of the circuit where no fluid and refrigerant are circulated in dashed lines. As shown in fig. 7, when the outdoor temperature is low, for example, less than or equal to 10 degrees celsius, the controller 430 controls the second fluid circuit 420 to be opened and the third fluid circuit 520 to be closed when the first end 681 and the second end 682 of the switching valve 680 are communicated. The temperature of the fluid after heat exchange with the outdoor cool air via the outdoor heat exchange module 425 is reduced, for example, to 12 degrees celsius, and the reduced temperature fluid absorbs heat of the first fluid circuit 410 in the indoor heat exchange module 421, and the temperature of the fluid of the second fluid circuit 420 is increased, for example, to 18 degrees celsius. In the second fluid circuit 420, the warmed fluid flows through the first fluid passage 620 in the condenser 613 and then back to the outdoor heat exchange module 425 to be cooled again to a lower temperature, for example, 12 degrees celsius, and so on. After the heat of the first fluid circuit 410 is absorbed in the indoor heat exchange module 421, the temperature is reduced, and flows to the heat load via the second fluid passage 630 in the evaporator 611, absorbs the heat of the heat load, flows to the indoor heat exchange module 421, and is cooled again in the indoor heat exchange module 421.

When the second fluid circuit 420 is in operation, the refrigerant cooling module 510 is not in operation and is only used for circulating the fluid in the first fluid circuit 410 and the second fluid circuit 420, namely, the coolant circuit 610 does not generate heat and does not generate cold, and the fluid temperature of the first fluid circuit 410 and the second fluid circuit 420 is not affected.

Fig. 8 shows an operating state of the cooling system 600 when the outdoor temperature is high, wherein the flow direction of the fluid is shown by arrow 801. As shown in fig. 8, when the outdoor temperature is high, for example, higher than 10 degrees celsius, the controller 430 controls the first end 681 and the third end 683 of the switching valve 680 to communicate, the third fluid circuit 520 is opened, the refrigerant cooling module 510 is opened, and the second fluid circuit 420 is closed. The refrigerant is condensed in the condenser 613, the fluid in the third fluid circuit 520 flows through the first fluid passage 620 of the condenser 613 and absorbs heat generated by the condensation, the temperature of the fluid is increased to, for example, about 60 degrees celsius, the temperature of the warmed fluid is reduced after heat exchange with outdoor cold air through the outdoor heat exchange module 425, for example, to about 40 degrees celsius, and the cooled fluid returns to the first fluid passage 620 to absorb heat generated by the condensation, and thus circulates. The heat of the first fluid circuit 410 is exchanged with the cold energy generated by the evaporation in the second fluid channel 630 in the evaporator 611, so that the fluid of the first fluid circuit 410 is cooled, the cooled fluid flows through the load, absorbs the heat of the heat load and then rises, and the heated fluid flows through the indoor heat exchange module 421 and then returns to the second fluid channel 630 to be cooled again, thus circulating.

Referring to fig. 6-8, in an embodiment of the present utility model, an outdoor temperature detection unit 691 for sending detection of the outdoor temperature to the controller 430, so that the controller 430 can turn on or off the second fluid circuit 420 or switch between the second fluid circuit 420 and the third fluid circuit 520 based on the outdoor temperature. The outdoor temperature detection unit may be coupled to the outdoor heat exchange module 425, for example, disposed at a fluid inlet of the outdoor heat exchange module 425 or on a housing.

In an embodiment of the present utility model, the outdoor heat exchange module 425 includes a fan 651 for cooling a fluid flowing through the outdoor heat exchange module 425, and in particular, the outdoor heat exchange module 425 may include a fluid passage, and the fan 651 is for blowing air to the fluid passage of the outdoor heat exchange module 425, so that the outdoor heat exchange module 425 achieves heat exchange between air and fluid. When the outdoor temperature is low, the fluid flowing through the outdoor heat exchange module 425 is cooled to a first temperature, and the fluid at the first temperature can directly exchange heat with the first fluid circuit 410 between the fluid in the indoor heat exchange module 421 to cool the first fluid circuit 410. When the outdoor temperature is high, the fluid flowing through the outdoor heat exchange module 425 is cooled to a second temperature, and the fluid with the second temperature is suitable for radiating the heat of the refrigerant cooling module 510, so that the refrigerant cooling module 510 can work normally.

As described above, the fluid inlet of the outdoor heat exchange module 425 communicates with the outlet of the first fluid passage 620, and further, a flow rate adjustment module 692 is further connected between the fluid inlet of the outdoor heat exchange module 425 and the first fluid passage 620, and the controller 430 is further configured to operate the flow rate adjustment module 692 based on the outdoor temperature to control the amount of fluid flowing from the first fluid passage 620 to the outdoor heat exchange module. By operating the flow adjustment module 692 to perform flow control such that when the outdoor temperature is too low, less fluid flows through the outdoor heat exchange module 425, avoiding the problem of too low a fluid temperature caused by a large amount of fluid being cooled.

Specifically, the flow adjustment module 692 is a fluid mixing valve that includes a first end 693, a second end 694, and a third end 695. The first end 693 of the fluid mixing valve communicates with the fluid inlet of the outdoor heat exchange module 425, the second end 694 communicates with the fluid outlet of the first fluid passage 620, and the third end 695 communicates with the fluid outlet of the outdoor heat exchange module 425. When the outdoor temperature is low, for example, below 0 degrees celsius, only less fluid may flow to the outdoor heat exchange module 425 via the second end 694 and the first end 693, respectively, while the remaining more fluid from the first fluid passage 620 flows to the fluid outlet of the outdoor heat exchange module 425 bypassing the outdoor heat exchange module 425 after passing the second end 694 and the third end 695, respectively, thus mixing the low temperature fluid and the high temperature fluid at the fluid outlet of the outdoor heat exchange module 425 to provide the mixed fluid with a suitable cooling temperature.

In an embodiment of the utility model, the second fluid circuit 420 and the third fluid circuit 520 further comprise pumps for fluid circulation, respectively, as shown in fig. 6, wherein a shared pump 696 is provided for the second fluid circuit 420 and the third fluid circuit 520.

In embodiments of the utility model, the first fluid circuit 410, the second fluid circuit 420, and the third fluid circuit 520 may each be in communication with a tank for replenishing fluid, e.g., the first fluid circuit 410 is in communication with the tank 697, and the second fluid circuit 420 and the third fluid circuit 520 are each in communication with the tank 698.

In an embodiment of the utility model, the first fluid circuit 410 also comprises a flow regulating valve 601, which may be a fluid mixing valve, for example comprising three ports, one of which communicates with the fluid outlet of the second fluid channel 630, one of which communicates with the fluid inlet of the indoor heat exchange module 421 and with the fluid outlet of the heat load cooling circuit, and the other of which communicates with the fluid inlet of the heat load cooling circuit, which may be part of the first fluid circuit for coupling with a heat load.

The first fluid circuit 410 may be coupled with a temperature detecting device (not shown) for feeding back the detected temperature at least one location of the first fluid circuit 410 to the controller 430, and the controller 430 may operate the flow regulating valve 601 based on the temperature at the at least one location to control the amount of cold water flowing to the heat load.

Optionally, the first fluid circuit 410 may also include a pump 602 for fluid circulation.

In the above embodiment of the present utility model, the second fluid circuit 420 directly cooled by the outdoor heat exchange module is provided, and the first fluid circuit 410 coupled to the thermal load exchanges heat with the second fluid circuit 420 to be cooled, thereby dissipating heat from the thermal load. And further provides a third fluid circuit 520 that cools via the outdoor heat exchange module and dissipates heat from the refrigerant cooling module, the first fluid circuit 410 coupled to the thermal load being cooled via the refrigerant cooling module, thereby dissipating heat from the thermal load. The third fluid circuit 520 and the second fluid circuit 420 are switched via the controller 430.

As described above, the third fluid circuit 520 and the second fluid circuit 420 have common portions, for example, at least a part of the components of the outdoor heat exchange module 425, the first fluid passage 620, the flow adjustment module 692, the pump 696, the water tank 697, the switching valve 680, and the like and a connection line between the at least a part of the components may be shared, however, as shown in fig. 9, the second fluid circuit 420 may be independent from the third fluid circuit 520, wherein the cooling system 900 may include two outdoor heat exchange modules 921, 922, two flow adjustment modules 991, 992, and two switching valves (e.g., a first switching valve 981, a second switching valve 982) for the second fluid circuit 420 and the third fluid circuit 520, respectively, and, as shown in fig. 5 and 9, the second fluid circuit 420 may not pass through the first fluid passage 620. The two outdoor heat exchange modules 921, 922 described above may have a similar structure to the corresponding outdoor heat exchange module 425, the two flow regulating modules 991, 992 may have a similar structure to the flow regulating module 692, and the two switching valves (e.g., the first switching valve 981, the second switching valve 982) may include only two ports, wherein each switching valve is operable to disconnect or connect its two ports.

The controller 430 may open the first switching valve 981 of the second fluid circuit 420 to open the second fluid circuit 420 when the outdoor temperature is lower than or equal to a specific temperature, or open the second switching valve 982 of the third fluid circuit 520 to open the third fluid circuit 520 when the outdoor temperature is higher than a specific temperature.

For ease of understanding, the second fluid circuit 420 is shown in phantom in fig. 9.

The "fluid" described above may be water or other fluid coolant capable of flowing.

Based on the above embodiments, the present utility model may provide a cooling system 400, 500, 600, 900 for a magnetic resonance system 100, the cooling system 400, 500, 600, 900 comprising:

a first fluid circuit 410, the first fluid circuit 410 being coupled to a thermal load of the magnetic resonance system 100; and

A second fluid circuit 420 including an indoor heat exchange module 421 and an outdoor heat exchange module 425, 921, the indoor heat exchange module 421 being in communication with the outdoor heat exchange module 425 or 921, the second fluid circuit 420 exchanging heat with outdoor air via the outdoor heat exchange module 425 and exchanging heat with the first fluid circuit 410 via the indoor heat exchange module 421;

Optionally, the cooling system 400, 500, 600, 900 may further include:

A third fluid circuit 520, the third fluid circuit 520 comprising the outdoor heat exchange module 425 or 922;

A refrigerant cooling module 510 for exchanging heat with the third fluid circuit 520 to be cooled and for exchanging heat with the first fluid circuit 410 to cool the first fluid circuit 410; and

A controller 430 for selectively opening the second fluid circuit 420 or the third fluid circuit 520 and the refrigerant cooling module 510 based on an outdoor temperature.

Optionally, the refrigerant cooling module 510 includes:

A refrigerant circuit 610;

a first fluid passage 620 in heat exchange relationship with the refrigerant circuit 610; and

A second fluid passage 630 in heat exchange relationship with the refrigerant circuit;

Wherein the third fluid circuit 520 comprises the outdoor heat exchange module 425 or 922 and the first fluid channel 620, and the first fluid circuit 410 comprises the second fluid channel 630.

Optionally, the cooling system 400, 500, 600, 900 may further include: the controller 430 selectively opens the second fluid circuit 420 or the third fluid circuit 520 by operating the switching valve 680 or the switching valve (e.g., the first switching valve 981, the second switching valve 982) for switching the second fluid circuit 420 and the switching valve 680 or the switching valve (e.g., the first switching valve 981, the second switching valve 982) of the third fluid circuit 520.

Optionally, the second fluid circuit 420 includes the first fluid passage 620 of the cryogen cooling module 510.

Optionally, the switching valve 680 includes:

A first end 681 in communication with the outdoor heat exchange module 425;

A second end 682 in communication with the indoor heat exchange module 421; and

A third end 683 of the first fluid passage 620 that communicates with the cryogen cooling module 510.

The controller 430 is configured to control the first end 681 of the switching valve 680 to communicate with the second end 682 to open the second fluid circuit 420, or to control the first end 681 of the switching valve 680 to communicate with the third end 683 to selectively open the third fluid circuit 520.

Optionally, the fluid inlet of the outdoor heat exchange module 425, 922 is in communication with the fluid outlet of the first fluid channel 620, and a flow regulating module 692, 992 is connected between the fluid inlet of the outdoor heat exchange module 425, 922 and the fluid outlet of the first fluid channel 620, the controller 430 being configured to operate the flow regulating module 692, 992 based on the outdoor temperature to control the amount of fluid flowing from the first fluid channel 620 to the outdoor heat exchange module 425 or 922.

Alternatively, the flow regulation modules 692, 991, 992 may be fluid mixing valves, for example, comprising:

A first end 693 in communication with the fluid inlet of the outdoor heat exchange module 425;

A second end 694 in communication with a fluid outlet of the first fluid passage 620; and

A third end 695 in communication with the fluid outlet of the outdoor heat exchange module 425.

Optionally, the refrigerant circuit 610 includes an evaporator 611, a compressor 612, a condenser 613, and an expansion valve 614, wherein,

The condenser 613 includes: a first refrigerant channel 616 for exchanging heat with the first fluid channel 620;

The evaporator 611 includes: a second refrigerant channel 617 for exchanging heat with the second fluid channel 630;

Both ends of the compressor 612 are respectively communicated with the refrigerant inlet of the first refrigerant passage 616 and the refrigerant outlet of the second refrigerant passage 617;

Both ends of the expansion valve 614 are respectively connected to the refrigerant outlet of the first refrigerant passage 616 and the refrigerant inlet of the second refrigerant passage 617.

Optionally, the cooling system 400, 500, 600, 900 may further comprise an outdoor temperature detection unit 691 for sending the detected outdoor temperature to the controller.

Optionally, the outdoor heat exchange module 425, 921, 922 comprises a fan 651 for cooling fluid flowing through the outdoor heat exchange module 425, 921, 922.

Optionally, the second fluid circuit 420 comprises a flow regulating module 991, the flow regulating module 991 being connected between the fluid outlet of the indoor heat exchange module 421 and the fluid inlet of the outdoor heat exchange module 925, the controller 430 being configured to operate the flow regulating module 992 based on the outdoor temperature to control the amount of fluid flowing from the indoor heat exchange module 421 to the outdoor heat exchange module 925.

Optionally, the second fluid circuit 420 includes a first switching valve 981, the third fluid circuit includes a second switching valve 982, and the controller 430 is configured to operate the first switching valve 981 to open or close the second fluid circuit 420 and to operate the second switching valve 982 to open or close the third fluid circuit 520.

Embodiments of the present utility model may also provide another cooling system 400, 500, 600 or 900 for a magnetic resonance system, wherein the controller 430 is configured to open the second fluid circuit 420 for a first preset period of time and to close the second fluid circuit 420 for a second preset period of time.

Embodiments of the utility model may also provide a magnetic resonance system 100 comprising a thermal load and the cooling system 400, 500, 600 or 900 for the magnetic resonance system 100 of any of the embodiments described above.

In addition to any previously indicated modifications, many other variations and alternative arrangements may be devised by those skilled in the art without departing from the spirit and scope of the present description, and the appended claims are intended to cover such modifications and arrangements. Thus, while the information has been described above with particularity and detail in connection with what is presently deemed to be the most practical and preferred aspects, it will be apparent to those of ordinary skill in the art that numerous modifications, including, but not limited to, forms, functions, manner of operation, and use may be made without departing from the principles and concepts set forth herein. Also, as used herein, examples and embodiments are intended to be illustrative only in all respects and should not be construed as limiting in any way.

The above specific embodiments are provided to provide a more thorough understanding of the present disclosure, but the present utility model is not limited to these specific embodiments. It will be understood by those skilled in the art that various modifications, equivalent substitutions and changes may be made to the present utility model without departing from the spirit thereof, and such changes should be construed to be within the scope of the present utility model.

Claims

1. A cooling system for a magnetic resonance system, comprising:

A first fluid circuit coupled to a thermal load of the magnetic resonance system; and

The second fluid loop comprises an indoor heat exchange module and an outdoor heat exchange module, wherein the indoor heat exchange module is communicated with the outdoor heat exchange module, and the second fluid loop exchanges heat with outdoor air through the outdoor heat exchange module and exchanges heat with the first fluid loop through the indoor heat exchange module.

2. The cooling system for a magnetic resonance system according to claim 1, further comprising:

a third fluid circuit including the outdoor heat exchange module; and

A refrigerant cooling module for exchanging heat with the third fluid circuit to be cooled and for exchanging heat with the first fluid circuit to cool the first fluid circuit; and

A controller for selectively opening the second fluid circuit or the third fluid circuit and the refrigerant cooling module based on an outdoor temperature.

3. The cooling system for a magnetic resonance system according to claim 2, wherein the cryogen cooling module comprises:

A refrigerant circuit;

a first fluid passage in heat exchange relationship with the refrigerant circuit; and

A second fluid passage in heat exchange relationship with the refrigerant circuit;

wherein the third fluid circuit includes the first fluid channel and the first fluid circuit includes the second fluid channel.

4. A cooling system for a magnetic resonance system according to claim 2, further comprising a switching valve for switching the second fluid circuit and the third fluid circuit, the controller selectively opening the second fluid circuit or the third fluid circuit by operating the switching valve.

5. A cooling system for a magnetic resonance system according to claim 3, characterized in that the second fluid circuit comprises the first fluid channel of the cryogen cooling module.

6. The cooling system for a magnetic resonance system according to claim 5, further comprising a switching valve comprising:

A first end communicated with the outdoor heat exchange module;

The second end of the indoor heat exchange module is communicated; and

A third end in communication with the first fluid passage of the cryogen cooling module;

The controller is used for controlling the first end of the switching valve to be communicated with the second end so as to open the second fluid loop, or controlling the first end of the switching valve to be communicated with the third end so as to selectively open the third fluid loop.

7. The cooling system for a magnetic resonance system according to claim 5, wherein a fluid inlet of the outdoor heat exchange module and a fluid outlet of the first fluid channel are in communication, and a flow adjustment module is connected between the fluid inlet of the outdoor heat exchange module and the fluid outlet of the first fluid channel, the controller being configured to operate the flow adjustment module based on the outdoor temperature to control an amount of fluid flowing from the first fluid channel to the outdoor heat exchange module.

8. The cooling system for a magnetic resonance system according to claim 7, wherein the flow regulating module is a fluid mixing valve comprising:

A first end in communication with a fluid inlet of the outdoor heat exchange module;

A second end in communication with the fluid outlet of the first fluid passageway; and

And a third end in communication with the fluid outlet of the outdoor heat exchange module.

9. A cooling system for a magnetic resonance system according to claim 3, characterized in that the refrigerant circuit comprises an evaporator, a compressor, a condenser and an expansion valve, wherein,

the evaporator includes: a second refrigerant channel for exchanging heat with the second fluid channel;

Two ends of the compressor are respectively communicated with a refrigerant inlet of the first refrigerant channel and a refrigerant outlet of the second refrigerant channel;

Two ends of the expansion valve are respectively communicated with the refrigerant outlet of the first refrigerant channel and the refrigerant inlet of the second refrigerant channel.

10. The cooling system for a magnetic resonance system according to claim 2, further comprising an outdoor temperature detection unit for transmitting the detected outdoor temperature to the controller.

11. The cooling system for a magnetic resonance system according to claim 1, wherein the outdoor heat exchange module comprises a fan for cooling fluid flowing through the outdoor heat exchange module.

12. The cooling system for a magnetic resonance system according to claim 2, wherein the second fluid circuit comprises a flow regulation module connected between a fluid outlet of the indoor heat exchange module and a fluid inlet of the outdoor heat exchange module, the controller being configured to operate the flow regulation module based on the outdoor temperature to control an amount of fluid flowing from the indoor heat exchange module to the outdoor heat exchange module.

13. The cooling system for a magnetic resonance system according to claim 4, wherein the second fluid circuit comprises a first switching valve, the third fluid circuit comprises a second switching valve, and the controller is configured to operate the first switching valve to open or close the second fluid circuit and to operate the second switching valve to open or close the third fluid circuit.

14. The cooling system for a magnetic resonance system according to any one of claims 2 to 10, 12 and 13, wherein the controller opens the second fluid circuit when the outdoor temperature is lower than or equal to a specific temperature; the controller opens the third fluid circuit when the outdoor temperature is higher than the specific temperature.

15. A cooling system for a magnetic resonance system, comprising:

a first fluid circuit coupled to a thermal load of the magnetic resonance system;

A second fluid circuit comprising an indoor heat exchange module and an outdoor heat exchange module, the indoor heat exchange module being in communication with the outdoor heat exchange module, the second fluid circuit exchanging heat with outdoor air via the outdoor heat exchange module and exchanging heat with the first fluid circuit via the indoor heat exchange module; and

And the controller is used for opening the second fluid loop in a first preset time period and closing the second fluid loop in a second preset time period.

16. A magnetic resonance system, comprising:

A thermal load; and

A cooling system for a magnetic resonance system according to any one of claims 1 to 15.