JP2006013408A - Deionized water boiling and cooling equipment with cooling medium opening and closing means - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide equipment that is operated well even in below a freezing environment as boiling and cooling equipment that uses deionized water as a cooling medium. <P>SOLUTION: Deionized water boiling and cooling equipment has: an evaporator that receives heat from a cooled body and converts deionized water as a cooling medium from a liquid phase to a gas phase; a gas path that is communicated with the evaporator to guide the deionized water converted from a liquid state to a gas state; a condenser that is communicated with the gas path to receive heat from the deionized water converted to a gas state, thus converting the deionized water from a gas phase to a liquid phase; and a sealed-up cooling system composed of a liquid path that is communicated with the condenser to guide the deionized water converted from a gas phase to a liquid phase back to the evaporator. A cooling medium opening and closing means is provided with either or both of the gas path and liquid path that controls or switches circulation of a cooling medium. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a boiling cooling apparatus that cools an object to be cooled by using a phase change of a cooling medium, and more particularly to a pure water boiling cooling apparatus that uses pure water as a cooling medium.

  Conventionally, as described in Patent Document 1, chlorofluorocarbon-based materials have been used as a cooling medium for a boiling cooling device that cools using a gas phase change of the cooling medium. However, chlorofluorocarbon-based materials have a warming potential. Therefore, from the viewpoint of inducing warming of the environment when leaking from the boiling cooling device, pure water that does not affect warming is currently used as a cooling medium as described in Patent Document 2. In addition, water has higher performance for boiling cooling than chlorofluorocarbon-based materials, and from this point of view, the use of pure water as a cooling medium is attracting attention.

  FIG. 8 shows a conventional pure water boiling cooling apparatus disclosed in Patent Document 2. In this figure, 1 is a flat semiconductor element as a body to be cooled, 2 is a cooling block for processing the heat generated by the flat semiconductor element 1, 3 is a bubble generated during the heat treatment, 4 is a stack of the flat semiconductor element 1 and the cooling block 2 Clamping bolts 5 and 5 are integrated stacks, and 6 is a sealed container that communicates with the cooling block 2. Evaporation that converts pure water 7 of the cooling medium stored in the cooling block 2 together with the cooling block 2 from a liquid phase to a gas phase. Configure the vessel. Here, pure water refers to pure water obtained by highly purifying water to remove impurities. 8 is a gas phase tube that is a passage for the generated bubbles 3, 9 is a liquid phase tube that is a passage of pure water that has changed phase from the gas phase to the liquid phase, 10 is water vapor that is aggregated by the bubbles 3, and 11 is liquid from the gas phase Pure water phase-changed into phases, 12 is a cooling pipe, 13 is a fin provided in the cooling pipe 12, 14 is cooling air that has passed through the cooling pipe 12, and 15 includes the cooling pipe 12, in which a cooling medium is contained. It is a condenser that converts from the gas phase to the liquid phase.

  In the conventional boiling cooling apparatus configured as described above, heat is generated when the flat semiconductor element 1 is energized. This heat is transmitted to the cooling block 2 disposed on the anode surface and the cathode surface of the flat semiconductor element 1 to change the phase of the pure water 7 filled in the cooling block 2 from a liquid phase to a bubble 3 which is a gas phase. . The phase-change pure water becomes water vapor 10 and is led to the condenser 15 through the gas phase pipe 8. Thereby, the water vapor 10 is filled in the condenser 15. Here, in the cooling pipe 12 of the condenser 15, heat exchange with air or the like as the secondary cooling medium is performed by the fins 13 provided on the surface thereof. As a result, the water vapor 10 is cooled while passing through the cooling pipe 12 and changes from the gas phase to the liquid phase. The pure water 11 that has returned to the liquid phase has a significantly increased density, and the influence of gravity is more dominant than the pressure difference, and starts to fall. The liquid-phase pure water that has started to fall returns to the cooling block 2 through the liquid-phase tube 9 and is subjected to boiling cooling again. By this continuous operation, the flat semiconductor element 1 is favorably cooled by the pure water vaporization latent heat of the cooling medium.

  However, such a boiling cooling apparatus has a specific problem that the cooling medium freezes in a sub-freezing environment because the cooling medium is water.

  That is, in an outdoor type boiling cooling device, a condenser or a cooling pipe is exposed to the outside air in order to improve the cooling capacity. Depending on the operating environment, particularly in a boiling cooling device used in a cold region, It can be enough.

  As described above, when the boiling cooling device, particularly the condenser or the cooling pipe is in a sub-freezing environment, if the temperature in the sealed cooling system is lowered as the outside air temperature is lowered, the inner temperature is reduced according to Boyle-Charle's law (P∝T). Atmospheric pressure decreases proportionally. When the pressure in the evaporator is lowered, the boiling point of pure water as a cooling medium is also lowered.

  For this reason, pure water as a cooling medium is vaporized in the evaporator at a relatively low temperature, and if the temperature in the condenser is lower than the temperature in the evaporator placed indoors, there is a difference in temperature between the two. At the same time, since a pressure difference is also generated, the water vapor 10 rises from the evaporator 2 through the gas phase pipe 8 and is sent to the condenser 15 where it is cooled in the cooling pipe to condense the water vapor in the gas phase and turn into a liquid phase. When the condenser or the cooling pipe is installed in a sub-freezing environment, the pure water as the liquid phase cooling medium is frozen on the spot. As a result, there is a shortage of liquid returning to the evaporator side due to freezing, and if this condition continues for a long time, the evaporator side will eventually dry out (liquid withering), and the device will have a cooling capacity. You will lose.

Therefore, in order to avoid such danger, it is important to prevent freezing of water as a cooling medium or to suppress the freezing amount.

  In Patent Document 1, as a means for preventing freezing of water as a cooling medium in a sub-freezing environment, an antifreeze liquid such as alcohol is mixed in the cooling medium water. It is considered that there is a possibility that it will adhere to the condenser, cooling pipe, etc. of the boiling cooling device by using it over a long period of time, thereby leading to deterioration of these devices, resulting in a decrease in cooling capacity or a shortage of return liquid.

  In Patent Document 2, as shown in FIG. 9, a heater 16 is provided in the condenser to prevent water from freezing. However, this method increases the number of parts by the number of heaters and heater attachment parts, thereby reducing the reliability of the product and is disadvantageous in terms of cost. In addition, since the heater needs a heat generation capacity equivalent to the heat generation capacity of the object to be cooled, there remains a problem in terms of power consumption.

  In Patent Document 3, as shown in FIG. 10, by using two or more types of heat pipes 19 having different thermal resistance, the heat radiation capacity is divided into several stages according to the outside air temperature. However, in this method, it is necessary to make two or more closed systems, and the cost, size, or weight increases as compared with the common condenser structure as shown in the conventional example.

In addition, as another means for solving the same problem, there is a method of increasing the pressure loss by reducing the diameter of the gas phase tube or the liquid phase tube. This method can certainly limit the circulation of the cooling medium and extend the time to dryout, but it also restricts the cooling capacity of the core because the gas phase tube and liquid phase tube diameter are thin.
JP-A-5-326773 (specification) Japanese Unexamined Patent Publication No. 2003-148883 (section 4, FIGS. 1 to 3) Japanese Patent Laid-Open No. 2001-118976 (Section 5, FIG. 5)

  The present invention solves the problems in these conventional methods, and provides an apparatus that can be used satisfactorily even in sub-freezing environments by adjusting the circulation amount of the cooling medium in a boiling cooling apparatus using pure water as a cooling medium. This is a problem.

  In order to solve the above-described problems, the present invention provides an evaporator 2 that receives heat from an object to be cooled and converts pure water as a cooling medium from a liquid phase to a gas phase, and a liquid that communicates with the evaporator 2. A gas phase passage 8 for inducing pure water converted from the phase into the gas phase, and receiving heat from the pure water converted into the gas phase in communication with the gas phase passage, the pure water is converted from the gas phase to the liquid phase. A pure water boiling cooling apparatus having a hermetically sealed cooling system comprising a condenser 15 for converting to water and a liquid phase passage 9 that communicates with the condenser and converts pure water converted from a gas phase to a liquid phase to the evaporator. In the above, a cooling medium opening / closing means for suppressing or opening / closing the circulation of the cooling medium is provided in one or both of the gas phase passage and the liquid phase passage.

  In the present invention, as the cooling medium opening / closing means, a differential pressure valve that opens and closes using a pressure difference inside and outside the boiling cooling device can be used. And this differential pressure valve is comprised with the pipe | tube formed of the flexible member, and also the pipe | tube is good to make it a flat shape or an inward folding shape.

  Similarly, this problem can also be solved by using a control valve such as an electromagnetic valve that is controlled to open and close in accordance with the outside air temperature and operating state of the boiling cooling device.

  According to the present invention, the cooling medium opening / closing means is provided in both the gas phase tube 8 or the gas phase tube and the liquid phase tube 9 of the boiling cooling device, so that the outside air temperature is below the freezing point and pure water (steam) as the cooling medium is introduced into the outside air. When there is a risk of freezing in the exposed condenser, this cooling medium opening / closing means blocks or suppresses the flow of pure water (steam), which is the cooling medium, into the condenser. Freezing of the condensed water can be minimized.

  As a result, the time to dry-out of the evaporator can be greatly extended, and the effect that the pure water boiling cooling device can be satisfactorily used even in a sub-freezing environment can be obtained.

  FIG. 1 is a cross-sectional view of a boiling cooling apparatus showing an embodiment of the present invention.

  Since the pure water boiling cooling apparatus targeted by the present invention forms a closed system made of metal or the like, the volume (V) of the closed system hardly changes regardless of changes in internal and external pressures (V≈const. ). Therefore, it can be understood that the internal pressure P of the closed system increases and decreases in proportion to the internal temperature T (steam temperature) of the closed system (P∝T) according to the PV / T = k equation of Boyle-Charles' law. On the other hand, the atmospheric pressure, which is the external pressure, is maintained in a substantially constant state regardless of the temperature.

  The apparatus of the present invention shown in FIG. 1 includes cooling medium opening / closing means 8A and 9A that interrupt or suppress the circulation of the cooling medium in the middle of the gas phase pipe 8 and the liquid phase pipe 9 that connect the evaporator 2 and the condenser 15, respectively. 4 is different from the conventional apparatus shown in FIG. 4 except that the other components are the same. Therefore, the same components are denoted by the same reference numerals and the description thereof is omitted.

  As the cooling medium opening / closing means 8A and 9A, a differential pressure valve mechanism that opens and closes according to the pressure difference between the external air pressure and the internal pressure in the closed system, or a control valve mechanism that opens and closes under the control of the outside is used. it can.

  When the differential pressure valve mechanism is used for the cooling medium opening / closing means 8A and 9A, this is because the operation of the apparatus is stopped and the temperature in the closed system is lowered due to the outside air temperature dropping to a temperature below the freezing point. At the same time, the internal pressure also decreases and the pressure difference from the atmospheric pressure increases, so that the circulation path of the cooling medium in the gas phase pipe 8 and the liquid phase pipe 9 is automatically closed or reduced to circulate the cooling medium vapor. Stops or suppresses. On the other hand, when the temperature in the closed system rises due to the start of operation of the device or the rise in the outside air temperature, the internal pressure also rises, so that the pressure difference between the inside and outside becomes small, and the circulation path of the cooling medium is opened or closed. Enlarging and allowing circulation of the cooling medium, the cooling medium circulation path is opened and closed according to the operating state of the boiling cooling device or the outside air temperature, and the circulation amount of the cooling medium is adjusted.

  Next, when a control valve mechanism is used for the cooling medium opening / closing means 8A and 9A, this is done by monitoring the outdoor outside air temperature where the condenser 15 is installed and the operating state of the object to be cooled, and condensing in the condenser 15. Circulation of the vapor of the cooling medium by closing or reducing the circulation path of the cooling medium in the gas phase pipe 8 and the liquid phase pipe 9 according to a control signal from an external control device when there is a risk of water freezing Is controlled so as to open or expand the circulation path of the cooling medium when the object to be cooled enters the operating state or when the outside air temperature rises, The cooling medium circulation path is opened and closed according to the outside air temperature to adjust the circulation amount of the cooling medium.

  By providing such cooling medium opening / closing means 8A and 9A in the boiling cooling device, when the outside air temperature drops below freezing point, the temperature in the closed system decreases and the pressure decreases, and this means is activated to The pipe 8 and the liquid phase pipe 9 are closed, or the pipe cross-sectional area is reduced and reduced. Alternatively, when the outside air temperature drops below freezing point and there is a risk of the condensed water freezing in the condenser 15, this means is activated to close the gas phase tube 8 and the liquid phase tube 9, or Reduce the road cross-sectional area.

  In the apparatus of the present invention, in such a low temperature state, the cooling medium opening / closing means 8A, 9A closes the gas phase pipe 8 and the liquid phase pipe 9 serving as a cooling medium circulation path, or reduces the circulation path. Therefore, even if the water of the cooling medium evaporates in the evaporator 2, the steam is blocked here, or the flow rate is slightly limited, so that it is not sent or sent to the condenser 15. Become scarce. For this reason, in a low temperature state where there is a risk of freezing, the vapor of the cooling medium water hardly flows into the condenser 2 and the generation of condensed water is suppressed, so that the occurrence of freezing can be prevented or minimized. it can. As a result, it is possible to suppress a decrease in pure water that is a cooling medium in the evaporator accompanying freezing, and to greatly extend the time to dryout during operation of the apparatus.

  In order to completely prevent freezing in the condenser, the passages of the gas phase pipe 8 and the liquid phase pipe 9 are preferably completely blocked by the cooling medium opening / closing means 8A and 9A.

  However, since the main problem to be solved by the present invention is to prevent or minimize the freezing of the condensed water in the condenser, the cooling medium opening and closing means is connected to the gas phase pipe 8 and the liquid phase pipe 9. It is not always necessary to provide both. Even if it is provided only on the gas phase tube 8 side, the function is sufficient.

  As such a cooling medium opening / closing means in the present invention, various types of valve mechanisms can be used.

  2a and 2b show a first embodiment of a valve mechanism using a tube formed of a flexible member.

  2A and 2B, reference numeral 80 denotes a valve mechanism serving as a cooling medium opening / closing means 8A interposed in the middle of the gas phase pipe 8. The valve mechanism 80 has flange portions 81 and 82 at both ends, and has a valve portion 83 formed of a flexible member that is easily deformed at an intermediate portion between the both flange portions. Then, the gas phase pipe 8 is coupled via the valve mechanism 80 by airtightly fitting both the flange portions 81 and 82 to the divided gas phase pipe 8.

  When the boiling cooling apparatus having such a valve mechanism 80 is in an operating state (a state where the cooled object 1 is in an operating state), the cooled object 1 generates heat, and pure water which is a cooling medium in the evaporator 2 11 is heated by this heat and evaporates.

  The water vapor generated by heating by the cooled object 1 flows from the evaporator 2 into the condenser 15 through the gas phase pipe 8, so that the gas in the closed system, which is normally set to a negative pressure lower than the atmospheric pressure, is obtained. As the internal pressure of the phase tube 8 increases and the pressure difference between the internal pressure and the external pressure decreases, the valve portion 83 of the valve mechanism 80 is pressed from the inside to the outside of the gas phase tube 8 as shown in FIG. Therefore, since the inner diameter of the valve portion 83 is expanded to the same extent as the inner diameter of the gas phase tube 8, the water vapor flows into the condenser 15 without any limitation. The water vapor that has flowed into the condenser 15 is cooled in the cooling pipe 12 to be converted into a liquid phase, and then returned to the evaporator 2 again through the liquid phase pipe 9, and thereafter the same cooling cycle is repeated (see FIG. 1). .

  When the body 1 to be cooled constitutes a ground facility or an in-vehicle facility of an electric railway, its operation is stopped at night when the railway operation is stopped. If such an operation stop is performed at night in winter when the outside air temperature falls below freezing point, the condenser 15 is usually installed outdoors, so that the temperature drops to near the outside air temperature below freezing point. When the temperature of the condenser 15 falls below the freezing point, the internal pressure in the closed system also decreases, and the valve portion 83 of the valve mechanism 80 is further pressed by the external air pressure as shown in FIG. Therefore, the inner diameter of the valve portion 83 is reduced or completely closed. As a result, water vapor flowing into the condenser 15 through the gas phase pipe 8 is suppressed or blocked, so that the condenser 8 can be prevented from freezing even in a low temperature state below the freezing point. Minimized. For this reason, evaporation of water which is a cooling medium in the evaporator 2 is suppressed, and the time until dryout when the operation of the cooled object 1 is resumed can be greatly extended.

  Although a slight amount of water is generated from the cooling medium water surface 9a of the liquid phase tube 9 of the boiling cooling device of FIG. 1, in order to prevent the vapor from flowing into the condenser 15 through the liquid phase tube 9, You may make it provide the valve mechanism 80 also in 9A part of the liquid phase pipe | tube 9. As shown in FIG. In this case, the valve mechanism must be provided indoors or in a place protected from the outside air according to this. This is to prevent the condensed water returning from the condenser 15 to the evaporator 2 from being frozen by this valve mechanism.

  As described above, when the valve portion 83 is formed of a flexible member, the valve portion 83 is likely to be deformed according to the pressure fluctuation in the closed system due to the operation state of the boiling cooling device and the outside air temperature. The advantage that the configuration can be simplified because the circulation path of the cooling medium in the sealed type can be controlled to open and close according to the operating state of the apparatus and the state of the outside air temperature without providing a means for monitoring the outside air temperature. There is.

  An elastic member such as rubber is suitable as the flexible member that forms the valve portion 83.

  Next, FIGS. 3a to 3c show a second embodiment of the valve mechanism using a tube formed of a flexible member as in the first embodiment.

  In this embodiment, the principle and configuration are the same as those in the first embodiment. However, as shown in FIG. 3A, the gas phase tube or liquid phase tube is provided with a flat gas phase tube 8 or liquid phase tube 9, and the gas phase tube The valve mechanism 80 is provided with a valve portion 83 made of a flexible member so that a part of the pipe or the liquid phase pipe is more easily affected by the fluctuation of the internal atmospheric pressure.

  The valve portion 83 is formed in a tubular shape having a substantially flat cross section as shown in the cross-sectional view taken along the line AA ′ of FIG. 3A shown in FIG. 3B, and the configuration thereof is a surface 83b having two long sides facing each other. 83b and two surfaces 83a and 83a having two short sides with a thickness which can be formed by joining both ends of the long side surfaces 83b and 83b, respectively.

 Here, since the short side surfaces 83a and 83a of the valve section are thick, the short side surfaces 83a and 83a are not deformed even if the internal / external pressure difference is relatively large, but the two opposing long side surfaces 83b and 83b are Since the wall is thin, the cross-sectional area of the internal passage is enlarged or reduced by a slight change in the internal / external pressure difference accompanying a change in the external temperature. That is, when the outside air temperature becomes low, the internal air pressure decreases, so that the outer walls of the long side surfaces 83b and 83b of the valve portion 83 are deformed inward, and the cross section of the internal passage is reduced or closed, while the outside air temperature becomes high. Since the internal air pressure rises, the outer walls of the long side surfaces 83b and 83b of the valve portion 83 are deformed outward, the cross section of the internal passage is widened, and the circulation path of the cooling medium is efficiently controlled to open and close. It becomes possible to adjust the circulation amount effectively.

  The valve mechanism according to the second embodiment achieves the object of the present invention as long as the long side surfaces 83b and 83b have a configuration, shape, or member that satisfies the requirement of easily operating even with slight fluctuations in internal and external pressure differences accompanying changes in the outside air temperature. Therefore, the short side surfaces 83a and 83a and the long side surfaces 83b and 83b in the valve section are not necessarily the same member. For example, the short side surfaces 83a and 83a of the valve section are not limited to flexible members, and may be configured by highly rigid members that are difficult to deform.

  Next, FIGS. 3d to 3g show a third embodiment of the valve mechanism using a tube formed of a flexible member, as in the first and second embodiments.

  In this embodiment, the principle and configuration are the same as those in Embodiments 1 and 2, but a flat gas-phase tube 8 or liquid-phase tube 9 is provided in the gas-phase tube or liquid-phase tube as shown in FIG. 3d. The valve mechanism 80 is provided with a valve portion 83 made of a flexible member so that a part of the gas phase pipe or the liquid phase pipe is more easily affected by the fluctuation of the internal atmospheric pressure.

  The valve part 83 is formed in a substantially rectangular tubular shape as shown in the cross-sectional view along the line AA ′ in FIG. 3d shown in FIG. 3e, and both ends of the opposing long sides 83b and 83b are formed. Two short sides 83a and 83a that connect the two are folded inward at an intermediate fold 83c, and can be expanded and contracted like a bellows.

  For this reason, the valve part 83 deform | transforms the short side surfaces 83a and 83a according to the fluctuation | variation of the internal / external pressure difference, and expands / contracts the cross-sectional area of an internal channel | path. That is, when the pressure in the internal passage of the valve portion 83 is higher than the external air pressure, the long side surfaces 83b and 83b are pushed outward, so that the short side surfaces 83a and 83a extend outward, as shown in FIG. The cross-sectional area of is enlarged. When the pressure in the internal passage becomes lower than the external pressure, the long side surfaces 83b and 83b are pushed inward, so that the short side surfaces 83a and 83a are folded inward to reduce the cross-sectional area of the internal passage in FIG. Reduced as shown.

  In this way, the upper and lower end portions a and b and the intermediate portion c of the short side surfaces 83a and 83a of the valve portion 83 are formed so as to be easily refracted, and the short side surfaces 83a and 83a can be folded inwardly. By doing so, the valve portion can be greatly deformed inward and outward by a slight fluctuation in the internal / external pressure difference, and the valve portion can be easily opened and closed.

  Specifically, when the outside air temperature becomes low, the pressure in the internal passage decreases and becomes lower than the outside air pressure. Therefore, the short side surfaces 83a and 83a of the valve portion 83 are inside by the outside air pressure due to the long side surfaces 83b and 83b. Since the folds 83c and 83c are deformed so as to be folded inward, the cross-sectional area of the internal passage is reduced or closed.

    On the other hand, when the outside air temperature rises, the internal pressure rises and becomes higher than the outside air pressure. Therefore, when the long side surfaces 83b and 83b of the valve portion 83 are pushed outward, the valve portion 83 configured to be internally foldable. Since the short side surfaces 83a and 83a open outward, the cross-sectional area of the internal passage is enlarged or expanded.

 With such an operation, the circulation path of the cooling medium can be efficiently controlled to be opened and closed, and the circulation amount of the cooling medium can be effectively adjusted.

  Since the valve mechanism according to the third embodiment can achieve the object of the present invention as long as it has a configuration, shape, or member that satisfies the requirements of easily operating even a slight fluctuation in internal / external pressure accompanying a change in the outside air temperature, The short side surfaces 83a and 83a and the long side surfaces 83b and 83b of the partial cross section are not necessarily the same member. For example, the long side surface of the cross section of the valve portion is not limited to a flexible member, and can be constituted by a highly rigid member that is not easily deformed.

  The cross-sectional shape of the valve portion 83 made of a flexible member constituting the valve mechanism 80 which is the cooling medium opening / closing means of the present invention is not limited to the flat and rectangular tube shown in FIGS. 3b and 3e. .

 For example, as shown in the cross-sectional views of the valve portion in FIGS. 3g (1) and 3g (2), a plurality of refracting portions (a to e) When the pressure is applied to the valve part due to fluctuations in the internal pressure, the valve part cross section is expanded and contracted so that the refracting part (ae) can expand and contract like a bellows according to its shape. The valve can be easily opened and closed.

 Further, as shown in the valve section sectional view of FIG. 3g (3), a valve section in which a plurality of unit valve sections each having a plurality of refracting sections (am) are provided on one side surface of the valve section is firmly bonded. Then, when pressure is applied to the valve part due to fluctuations in internal pressure, the refracting part (am) expands and contracts the valve part cross section so that it can expand and contract like a bellows according to its shape, making it easy to open and close the valve. Is possible.

 Furthermore, as shown in the cross-sectional view of the valve portion in FIG. 3g (4), in the valve portion having a star shape having the refracting portions (a to j), when pressure is applied to the valve portion due to fluctuations in internal pressure. The refracting portions (a to j) can expand and contract the cross section of the valve portion according to the shape thereof, thereby facilitating the opening and closing of the valve.

 In order to connect the valve mechanism 80 constituted by the valve portion 83 and the flange portions 81 and 82 to the gas phase tube 8 or the liquid phase tube 9, the flange portions 81 and 82 made of a flexible member are used. The gas phase tube 8 or the liquid phase tube 9 can be combined with the gas phase tube 8 or the liquid phase tube 9 via the valve mechanism 80 by forming the gas phase tube 8 or the liquid phase tube 9 so as to be fitted.

  Next, a fourth embodiment of the cooling medium opening / closing means according to the present invention is shown in FIG.

  In FIG. 4, 84 is an electromagnetic valve disposed in the gas phase pipe 8. Unlike the valve mechanism 80 configured by the flexible member shown in FIG. 2, the electromagnetic valve 84 itself does not have a function that operates according to the pressure difference between the inside and outside of the gas phase pipe 9. A control device 85 is provided for controlling 84 in accordance with the outside air temperature and the operating state of the cooled object 2. The controller 85 is connected to an outside air temperature detector 86 for detecting the outside air temperature and a cooled object temperature detector 87 for detecting the operating state of the cooled object.

  When the object to be cooled 2 is in operation, the controller 85 is heated by the heat generated by itself and is at a temperature higher than a predetermined temperature. Therefore, the controller 85 monitors the temperature of the object to be cooled 2 to operate it The state can be detected. Further, the control device 85 detects whether or not the outside air temperature is below the freezing point where there is a risk of freezing by monitoring the detection signal of the outside air temperature detector 86.

  The control device 85 processes the output signals of the two temperature detectors and controls the solenoid valve according to the flow shown in FIG.

  That is, the control device 85 reads the detection signal of the cooled object temperature detector 87 in S1, and determines whether or not the cooled object 2 is in an operating state from the magnitude of this read signal in S2. When it is determined that the temperature is equal to or higher than the predetermined temperature and the body to be cooled 2 is in operation, the process proceeds to S3 to give an open command to the electromagnetic valve 84 (FIG. 4a).

  When it is determined that the object to be cooled 2 has stopped operating, the process proceeds to S4, and the detection signal of the outside air temperature detector 86 is read. It is determined from the read outside temperature detection output signal whether or not the outside temperature is below the freezing point temperature at which there is a risk of freezing (S5). When the outside temperature is higher than below freezing point, the process proceeds to S3 and the solenoid valve 84 is instructed to open. Keep giving. When the temperature is lower than the freezing point, the process proceeds to S6 to give a close command to the electromagnetic valve 84 (FIG. 4b).

  By such a control device 85, the electromagnetic valve 84 is opened as long as the cooled object 2 is operated, and the vapor of the cooling medium (water) generated in the evaporator 2 is circulated through the gas phase pipe 8. The object to be cooled 2 is normally cooled by the boiling cooling device. When the operation of the cooled object 2 is stopped and the outside air temperature is below the freezing point where the risk of freezing occurs, the solenoid valve 84 is closed, so that the circulation of the steam generated in the evaporator 2 is interrupted. .

  For this reason, when the operation of the cooled object 2 is stopped at night in winter and the outside air temperature falls below the freezing point causing the risk of freezing, the vapor phase pipe 8 of the boiling cooling device in FIG. Since the inflow of the vapor of the cooling medium (water) from the evaporator 2 is shut off, the water vapor 10 does not flow into the condenser 15, and the evaporation of pure water as a refrigerant is suppressed in the evaporator 2. The time to dryout can be greatly extended.

  When the operation is resumed, the temperature of the cooled object 2 rises, and when the predetermined temperature is reached, an opening command is given from the control device 85 to the electromagnetic valve 54, so that the vapor phase pipe 8 is opened. The steam generated in the evaporator 2 flows to the condenser 15, and the boiling cooling operation of the cooled object 2 is automatically restarted.

It is sectional drawing of the pure water boiling cooling device which shows the structure of this invention. It is sectional drawing which shows the 1st Example of the cooling medium circulation promotion or opening / closing means used for this invention. It is sectional drawing used for operation | movement description of the apparatus shown in FIG. 2a. It is the 2nd Example of the substantially flat tubular gas-phase pipe | tube or liquid phase pipe | tube used for this invention. It is A-A 'sectional drawing which shows the 2nd Example of the cooling medium circulation promotion or opening / closing means used for this invention. It is A-A 'sectional drawing used for description of operation | movement of the apparatus shown in FIG. 3b. It is the 3rd Example of the substantially rectangular tubular gas-phase pipe | tube or liquid phase pipe | tube used for this invention. It is A-A 'sectional drawing which shows the 3rd Example of the cooling medium circulation promotion or opening / closing means used for this invention. It is A-A 'sectional drawing used for description of operation | movement of the apparatus shown in FIG. 3e. It is sectional drawing of the cooling-medium circulation promotion or opening / closing means of the other shape. It is a block diagram which shows the 5th Example of the cooling medium circulation promotion or opening / closing means used for this invention. It is a figure which shows the operation | movement flow of the control apparatus shown in FIG. It is a partially expanded sectional view which shows the conventional pure water boiling cooling device. It is sectional drawing which shows the pure water boiling cooling device using the conventional heater. It is sectional drawing which shows the cooling device using the conventional heat pipe.

Explanation of symbols

1 Object to be cooled (flat semiconductor element)
2 Cooling block 3 Bubble 4 Clamping bolt 5 Stack 6 Sealed container 7 Pure water 8 Gas phase pipe 8A Cooling medium circulation promotion or opening / closing means 80 Valve mechanism 81 Flange 82 Flange 83 Valve portion 83a Short side surface 83b Long side surface 83c Fold 84 Electromagnetic Valve 85 Control device 86 Outside air temperature detector 87 Cooled object temperature detector 9 Liquid phase tube 9A Cooling medium circulation promotion or switching means 10 Water vapor 11 Pure water 12 Cooling tube 13 Fin 14 Cooling air 15 Condenser

Claims (7)

An evaporator that receives heat from an object to be cooled and converts pure water as a cooling medium from a liquid phase to a gas phase, and a vapor phase that communicates with the evaporator and induces pure water converted from a liquid phase to a gas phase. A passage, a condenser that receives heat from the pure water that has been converted into the gas phase and communicates with the gas phase passage, and converts the pure water from the gas phase to a liquid phase; In a pure water boiling cooling device having a sealed cooling system comprising a liquid phase passage for returning pure water converted to a liquid phase to the evaporator,
A pure water boiling cooling device comprising a cooling medium opening / closing means for suppressing or opening / closing a circulation of a cooling medium in one or both of a gas phase passage and a liquid phase passage.   2. The pure water boiling cooling device according to claim 1, wherein the cooling medium opening / closing means is a cooling medium opening / closing valve.   3. The pure water boiling cooling device according to claim 2, wherein the cooling medium on-off valve is a differential pressure valve that operates by a pressure difference between an external pressure inside and outside the sealed system and an internal pressure.   The pure water boiling cooling apparatus according to claim 3, wherein a part or all of the valve portion of the differential pressure valve is a tube formed of a flexible member.   The pure water boiling cooling apparatus according to claim 3 or 4, wherein a cross section of a valve portion of the differential pressure valve is a substantially flat tube.   5. The pure water boiling cooling device according to claim 3, wherein a cross section of a valve portion of the differential pressure valve is an internally folded pipe.   The pure water boiling cooling device according to claim 2, wherein the cooling medium on-off valve is an electromagnetic valve.

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