KR20150041739A - Heat pump system for vehicle - Google Patents

Abstract

The present invention relates to a heat pump system for vehicle. More specifically, the invention relates to a heat pump system which can prevent noise and vibration due to refrigerant differential pressure by controlling in such a way as to perform a direction conversion after delaying direction conversion of a direction conversion value for a certain amount of time when inputting a mode change signal between an air-conditioner mode and a heat-pump mode.

Description

[0001] Heat pump system for vehicle [0002]

The present invention relates to a vehicle heat pump system, and more particularly, to a heat pump system for a vehicle, and more particularly, to a heat pump system for a vehicle, To a vehicle heat pump system capable of preventing noise and vibration due to refrigerant pressure difference.

Background Art [0002] A vehicle air conditioner generally includes a cooling system for cooling the interior of a vehicle and a heating system for heating the interior of the vehicle. Wherein the cooling system is configured to cool air in the vehicle interior by exchanging air passing through the outside of the evaporator at the evaporator side of the refrigerant cycle with the refrigerant flowing in the evaporator to convert into cool air, The air passing through the outside of the core is exchanged with the cooling water flowing in the inside of the heater core to warm the inside of the vehicle.

A heat pump system which can selectively perform cooling and heating by switching the flow direction of refrigerant by using one refrigerant cycle is different from the above vehicle air conditioning system. For example, two heat exchangers (That is, an indoor heat exchanger installed inside the air conditioner case for exchanging heat with air blown into the vehicle interior, and an outdoor heat exchanger for exchanging heat outside the air conditioner case), and a direction control valve for switching the flow direction of the refrigerant do. Therefore, when the cooling mode is operated according to the flow direction of the refrigerant by the direction control valve, the indoor heat exchanger functions as a cooling heat exchanger. When the heating mode is activated, the indoor heat exchanger functions as a heating heat exchanger .

Various kinds of such a heat pump system for vehicles have been proposed, and a representative example thereof is shown in Fig.

1 includes a compressor 30 for compressing and discharging a refrigerant, an indoor heat exchanger 32 for dissipating heat of a refrigerant discharged from the compressor 30, A first expansion valve 34 for expanding the refrigerant having passed through the heat exchanger 32 and a first direction switching valve 34 for selectively flowing the refrigerant having passed through the indoor heat exchanger 32 to the first expansion valve 34 An evaporator 60 for evaporating the refrigerant passed through the outdoor heat exchanger 48, and an evaporator 60 for evaporating the refrigerant that has passed through the outdoor heat exchanger 48. The outdoor heat exchanger 48, An accumulator 62 for separating the refrigerant having passed through the evaporator 60 into a gaseous phase and a liquid refrigerant and an internal heat exchanger for exchanging heat between the refrigerant supplied to the evaporator 60 and the refrigerant returning to the compressor 30 (50), and a refrigerant supplied to the evaporator (60) And a bypass line 59 connecting the outlet side of the outdoor heat exchanger 48 and the inlet side of the accumulator 62. The bypass line 59 is connected to the first expansion valve 56, And a second direction switching valve (58) installed at a branch point of the second direction switching valve (58).

1, reference numeral 10 denotes an air conditioning case in which the indoor heat exchanger 32 and the evaporator 60 are installed, 12 denotes a temperature control door for controlling the mixing amount of cool air and warm air, 20 denotes an inlet of the air conditioner case And 37 denotes a bypass line for bypassing the first expansion valve 34, respectively.

According to the conventional vehicular heat pump system configured as described above, when the heat pump mode (heating mode) is activated, the first direction switching valve 36 switches the direction so that the refrigerant passes through the first expansion valve 34 And the second direction switching valve 58 switches the direction so that the refrigerant bypasses the second expansion valve 56. In addition, the temperature control door 12 operates as shown in Fig. Therefore, the refrigerant discharged from the compressor 30 flows through the indoor heat exchanger 32, the first direction switching valve 36, the first expansion valve 34, the outdoor heat exchanger 48, The second direction switching valve 58, the accumulator 62 and the low pressure portion 54 of the internal heat exchanger 50 are sequentially returned to the compressor 30. That is, the indoor heat exchanger 32 serves as a radiator, and the outdoor heat exchanger serves as an evaporator.

When the air conditioner mode (cooling mode) is activated, the first direction switching valve 36 switches the direction so that the refrigerant bypasses the first expansion valve 34, and the second direction switching valve 58 switches the direction And is then switched so as to pass through the second expansion valve 56. In addition, the temperature control door 12 closes the passage of the indoor heat exchanger 32. Therefore, the refrigerant discharged from the compressor 30 flows through the indoor heat exchanger 32, the first direction switching valve 36, the outdoor heat exchanger 48, the high pressure portion 52 of the internal heat exchanger 50, the second expansion valve 56, the evaporator 60, the accumulator 62, and the low-pressure section 54 of the internal heat exchanger 50 in this order. That is, the evaporator 60 functions as an evaporator, and the indoor heat exchanger 32, which is closed by the temperature control door 12, functions as a heater as in the heat pump mode.

However, in the conventional vehicle heat pump system, there is a problem that when the high pressure refrigerant is discharged at a low pressure due to the refrigerant pressure difference between the heat pump mode and the air conditioning mode, noise and vibration occur.

That is, in the air conditioner mode, high-temperature, high-pressure refrigerant flows to the first direction switching valve 36 and the bypass line 37 side and the second stall switching valve 58, When the heat pump mode is changed to the heat pump mode at this time, the first direction switching valve 36 is switched to the low pressure state by the high-temperature high-pressure refrigerant passing through the indoor heat exchanger 32, And the second directional control valve (58) is connected to the outdoor heat exchanger (48) so that the high-temperature and high-pressure refrigerant passing through the outdoor heat exchanger (48) Bypass line 59, noise and vibration due to refrigerant pressure difference are generated.

In the heat pump mode, the high-temperature and high-pressure refrigerant flows through the first direction switching valve 36, the low-temperature low-pressure refrigerant flows through the second switching valve 58, and the bypass line 37 and the second When the mode is changed to the air conditioning mode, the first directional control valve 36 controls the first expansion valve 34 such that refrigerant of high temperature and high pressure, which has passed through the indoor heat exchanger 32, And the refrigerant is bypassed to flow toward the bypass line 37, which is in a low pressure state, so that noise and vibration due to the refrigerant pressure difference are generated.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems by providing a control device for controlling a direction change of a directional control valve by delaying a direction of a directional change valve And to provide a vehicle heat pump system capable of preventing noise and vibration.

According to an aspect of the present invention for achieving the above object, there is provided a refrigerating apparatus including a plurality of devices including a compressor, an indoor heat exchanger, a first valve, an outdoor heat exchanger, and an evaporator in a refrigerant circulation line, A bypass line and a second valve for bypassing a specific device among the devices are provided. When the mode change signal is input between the air conditioner mode and the heat pump mode, the flow direction of the refrigerant is switched through the direction change of the second valve Wherein the control unit controls the direction switching of the second valve after delaying the direction of the second valve by a predetermined time at the time of inputting the mode change signal.

The present invention can prevent the noise and vibration due to the refrigerant pressure difference by controlling the direction switching of the directional switching valve after a certain time delay after the mode change signal is inputted between the air conditioner mode and the heat pump mode .

1 is a schematic view showing a conventional heat pump system for a vehicle,
FIG. 2 is a diagram showing an air conditioner mode in a heat pump system for a vehicle according to the present invention,
3 is a diagram showing a heat pump mode in a vehicle heat pump system according to the present invention,
4 is a view showing a dehumidifying mode during heat pump mode operation in a heat pump system for a vehicle according to the present invention.
5 is a sectional view showing a state in which the on-off valve of the first valve is opened and closed in the heat pump system for a vehicle according to the present invention,
6 is a cross-sectional perspective view showing the expansion means in the vehicle heat pump system according to the present invention,
7 is a graph showing a delay time according to an outside temperature in a heat pump system for a vehicle according to the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

First, a heat pump system for a vehicle according to the present invention includes a compressor 100, an indoor heat exchanger 110, a first valve 120, an outdoor heat exchanger 130, an evaporator 160, And a bypass line (R1) and a second valve (191) for allowing a refrigerant circulating through the refrigerant circulation line (R) to bypass a specific one of the plurality of devices, And a control unit (not shown) for switching the flow direction of the refrigerant through the direction switching of the second valve 191 when a mode change signal is inputted between the air conditioner mode and the heat pump mode.

The bypass line R1 for bypassing the expansion means 140 and the evaporator 160 as well as the bypass line R1 for bypassing the outdoor heat exchanger 130 are provided on the refrigerant circulation line R. [ A line R2 is also installed.

At this time, the second valve 191 is installed at the branch point of the bypass line R1 and the third valve 192 is provided at the branch point of the auxiliary bypass line R2.

2, the refrigerant discharged from the compressor 100 flows through the indoor heat exchanger 110, the first valve 120, the outdoor heat exchanger 130, the expansion means 140, the evaporator (not shown) The indoor heat exchanger 110 functions as a condenser and the evaporator 160 serves as an evaporator and the first valve 120 functions as a condenser, Thereby allowing the refrigerant to pass in an unexpanded state.

Meanwhile, the outdoor heat exchanger 130 functions as a condenser as the indoor heat exchanger 110.

3, the refrigerant discharged from the compressor 100 flows through the indoor heat exchanger 110, the orifice 128 of the first valve 120, the outdoor heat exchanger 130, the bypass line The indoor heat exchanger 110 serves as a condenser and the outdoor heat exchanger 130 serves as an evaporator and the first valve 120 And the refrigerant is not supplied to the expansion means 140 and the evaporator 160.

On the other hand, in the heat pump mode, part of the refrigerant circulating in the refrigerant circulation line R is supplied to the evaporator 160 through the dehumidification line R3, which will be described later, to perform the room interior dehumidification.

Hereinafter, each component of the heat pump system will be described in detail.

First, the compressor 100 installed on the refrigerant circulation line R is driven by receiving power from an engine (internal combustion engine) or a motor or the like, sucking the refrigerant, compressing the refrigerant, and discharging the refrigerant in a state of high temperature and high pressure.

The compressor 100 sucks and compresses the refrigerant discharged from the evaporator 160 in the air conditioning mode and supplies the compressed refrigerant to the indoor heat exchanger 110. In the heat pump mode, And sucks and compresses the refrigerant discharged through the bypass line R1 and supplies the compressed refrigerant to the indoor heat exchanger 110 side.

In the dehumidifying mode of the heat pump mode, the refrigerant is simultaneously supplied to the evaporator 160 through the bypass line R1 and the dehumidifying line R3 described later. In this case, Passes through the pass line (R1) and the evaporator (160), sucks the combined refrigerant, compresses it, and supplies it to the indoor heat exchanger (110) side.

The indoor heat exchanger 110 is installed inside the air conditioning case 150 and is connected to the refrigerant circulation line R at the outlet side of the compressor 100 and is connected to the air flowing in the air conditioning case 150 The refrigerant discharged from the compressor 100 is heat-exchanged.

The evaporator 160 is installed inside the air conditioning case 150 and is connected to the refrigerant circulation line R at the inlet side of the compressor 100 so that the air flowing in the air conditioning case 150 The refrigerant flowing into the compressor 100 is heat-exchanged.

The indoor heat exchanger 110 functions as a condenser in both the air conditioning mode and the heat pump mode,

The evaporator 160 serves as an evaporator in the air conditioning mode, and stops operating because the refrigerant is not supplied in the heat pump mode. Of course, in the dehumidifying mode, a part of the refrigerant is supplied to perform the evaporator function.

The indoor heat exchanger 110 and the evaporator 160 are installed in the air conditioner case 150 at a predetermined distance from the air conditioner case 150, And an indoor heat exchanger 110 are sequentially installed.

2, the low-temperature and low-pressure refrigerant discharged from the expansion means 140 is supplied to the evaporator 160. At this time, the blower (not shown) Air passing through the air conditioning case 150 through the evaporator 160 passes through the evaporator 160 and is exchanged with the low temperature low pressure refrigerant in the evaporator 160 to be converted into a cool air, .

In the heat pump mode in which the indoor heat exchanger 110 serves as a condenser, refrigerant of high temperature and high pressure discharged from the compressor 100 is supplied to the indoor heat exchanger 110 as shown in FIG. 3, The air flowing through the inside of the air conditioner case 150 through the indoor heat exchanger 110 passes through the indoor heat exchanger 110 and is heat-exchanged with the high temperature and high pressure refrigerant in the indoor heat exchanger 110, So that the inside of the car is heated.

The amount of air passing through the indoor heat exchanger 110 and the amount of air passing through the indoor heat exchanger 110 are adjusted between the evaporator 160 and the indoor heat exchanger 110 in the air conditioning case 150 A temperature control door 151 is provided.

The temperature control door 151 adjusts the amount of air passing through the indoor heat exchanger 110 and the amount of air passing through the indoor heat exchanger 110 to control the temperature of the air discharged from the air conditioning case 150 Can be adjusted appropriately,

2, when the front side passageway of the indoor heat exchanger 110 is completely closed through the temperature control door 151 as shown in FIG. 2, the cold air passing through the evaporator 160 passes through the indoor heat exchanger 110, So that the maximum cooling is performed. In the heat pump mode, when the passageway for bypassing the indoor heat exchanger 110 is completely closed through the temperature control door 151 as shown in FIG. 3 , All the air passes through the indoor heat exchanger (110) serving as a condenser, and is converted into warm air, and the warm air is supplied to the room.

The outdoor heat exchanger 130 is installed outside the air conditioning case 150 and is connected to the refrigerant circulation line R to exchange heat between the refrigerant circulating in the refrigerant circulation line R and the outside air do.

The outdoor heat exchanger 130 is installed on the front side of the vehicle engine room to exchange heat with refrigerant flowing in the outdoor space.

The outdoor heat exchanger 130 functions as the same condenser as the indoor heat exchanger 110 in the air conditioning mode. At this time, the high-temperature refrigerant flowing in the outdoor heat exchanger 130 is condensed while exchanging heat with the outside air . In the heat pump mode, the refrigerant acts as an evaporator opposite to the indoor heat exchanger 110. At this time, the low-temperature refrigerant flowing in the outdoor heat exchanger 130 is evaporated by heat exchange with the outside air.

The first valve 120 includes an on-off valve 125 installed on a refrigerant circulation line R between the indoor heat exchanger 110 and the outdoor heat exchanger 130 to turn on / off a refrigerant flow, Off valve 125 and an orifice 128 for expanding the refrigerant. In the air conditioning mode, the on-off valve 125 is opened to cause the refrigerant to flow in an unexpanded state. In the heat pump mode, The on-off valve 125 is closed to expand the refrigerant through the orifice 128 to flow.

In other words, the first valve 120 is configured by integrating a two-way on-off valve 125 and an orifice 128 acting as a throttling.

5 is a view showing an opening and closing operation state of the first valve 120. A flow path 126 through which the refrigerant flows is formed inside the on-off valve 125, (127).

At this time, the valve member 127 is provided with an orifice 128 for expanding the refrigerant.

On the one side of the on-off valve 125, a solenoid 129 for opening and closing the valve member 127 is provided.

The solenoid 129 linearly reciprocates the valve member 127 to open or close the refrigerant passage 126.

Accordingly, when the valve member 127 of the first valve 120 opens the flow passage 126, the refrigerant passing through the first valve 120 passes without being inflated, When the valve member 127 closes the flow passage 126, the refrigerant passing through the first valve 120 is expanded and then passes through the orifice 128 of the valve member 127.

On the other hand, although not shown in the drawing, a motor may be provided instead of the solenoid 129 to operate the valve member 127 of the on-off valve 125.

That is, the motor is installed on one side of the on-off valve 125 to rotate the valve member 127.

In the case of the solenoid 129, the valve member 127 linearly reciprocates to open and close the refrigerant passage 126. However, in the case of the motor, the valve member 127 is rotated to open and close the refrigerant passage 126 .

The bypass line R1 is provided so as to connect the refrigerant circulation line R at the outlet side of the outdoor heat exchanger 130 and the refrigerant circulation line R at the inlet side of the compressor 100, So that the refrigerant circulating through the line R selectively bypasses the expansion means 140 and the evaporator 160.

The bypass line R1 is disposed in parallel with the expansion unit 140 and the evaporator 160. That is, the inlet side of the bypass line R1 is connected to the outdoor heat exchanger 130 Is connected to a refrigerant circulation line (R) connecting the expansion means (140) and an outlet side is connected to a refrigerant circulation line (R) connecting the evaporator (160) and the compressor (100).

The refrigerant that has passed through the outdoor heat exchanger 130 flows into the expansion device 140 and the evaporator 160 while in the heat pump mode, The refrigerant flows directly to the compressor 100 side through the bypass line R 1 to bypass the expansion means 140 and the evaporator 160.

Here, the second valve 191 serves to change the flow direction of the refrigerant according to the air conditioner mode and the heat pump mode.

The second valve 191 is installed at a branch point between the bypass line R 1 and the refrigerant circulation line R and is connected to the outdoor heat exchanger 130 through the outdoor heat exchanger 130, The flow direction of the refrigerant is switched so as to flow toward the bypass line (R1) or the expansion means (140) side.

At this time, the second valve 191 is opened when the refrigerant discharged from the compressor 100 and passed through the indoor heat exchanger 110, the first valve 120, and the outdoor heat exchanger 130 in the air conditioning mode flows through the expansion means The refrigerant discharged from the compressor 100 flows through the indoor heat exchanger 110 and the orifices 128 of the first valve 120 and the refrigerant discharged from the outdoor heat exchanger 110 to the evaporator 160. [ So that the refrigerant passing through the bypass line (130) flows in the bypass line (R1).

Meanwhile, the second valve 191 is installed at a branching point on the inlet side of the bypass line R1, and it is preferable to use a three-way valve.

It is preferable that not only the second valve 191 but also the third valve 192 use a three-way valve.

On the bypass line R1, a heat supply means 180 for supplying heat to the refrigerant flowing along the bypass line R1 is installed.

The heat supply unit 180 includes a refrigerant heat exchanger 181a through which the refrigerant flowing through the bypass line R1 flows so that the waste heat of the vehicle electrical equipment 200 can be supplied to the refrigerant flowing through the bypass line R1, And a cooling water heat exchanger 181b which is provided at one side of the refrigerant heat exchanger 181a and is capable of exchanging heat with the cooling water heat exchanger 181b through which the cooling water circulating in the vehicle electrical appliance 200 flows.

Therefore, the heating performance can be improved by recovering the heat source from the waste heat of the vehicle electrical equipment 200 in the heat pump mode.

On the other hand, the vehicle electrical equipment 200 is typically a motor, an inverter, or the like.

An accumulator 170 is installed on the refrigerant circulation line R on the inlet side of the compressor 100.

The accumulator 170 separates the liquid refrigerant and the gaseous refrigerant from the refrigerant supplied to the compressor 100 so that only the gaseous refrigerant can be supplied to the compressor 100.

An electric heater 115 is further installed on the downstream side of the indoor heat exchanger 110 in the air conditioning case 150 to improve the heating performance.

That is, the heating performance can be improved by operating the electric heating type heater 115 as an auxiliary heat source at the start of the vehicle, and the electric heating type heater 115 can be operated even when the heating heat source is insufficient.

As the electric heater 115, a PTC heater is preferably used.

An auxiliary bypass line R2 is installed in parallel with the refrigerant circulation line R so that the refrigerant passing through the first valve 120 bypasses the outdoor heat exchanger 130.

The auxiliary bypass line R2 is provided so as to connect the inlet side refrigerant circulation line R and the outlet side refrigerant circulation line R of the outdoor heat exchanger 130 to the refrigerant circulation line R, Thereby bypassing the outdoor heat exchanger 130.

In addition, a third valve 192 is provided to switch the flow direction of the refrigerant so that the refrigerant circulating through the refrigerant circulation line R flows selectively into the auxiliary bypass line R2.

The third valve 192 is installed at a branch point between the auxiliary bypass line R2 and the refrigerant circulation line R so that the refrigerant flows to the outdoor heat exchanger 130 or the auxiliary bypass line R2 The flow direction of the refrigerant is switched.

At this time, since the outdoor heat exchanger 130 can not smoothly absorb heat from the outside air when the outdoor heat exchanger 130 is concealed or the outdoor temperature is lower than 0 ° C, So that the refrigerant circulating in the outdoor heat exchanger (R) bypasses the outdoor heat exchanger (130).

On the other hand, when the outdoor temperature is not necessarily 0 ° C and the heat exchange efficiency between the outdoor air and the refrigerant flowing through the outdoor heat exchanger 130 is good, the refrigerant passes through the outdoor heat exchanger 130 and the heat exchange efficiency is low The outdoor heat exchanger 130 is bypassed, thereby improving the heating performance and efficiency of the system.

When the refrigerant flows to the auxiliary bypass line (R2) and bypasses the outdoor heat exchanger (130) when the outdoor heat exchanger (130) is concealed, the conception can be delayed or the conception can be solved.

A dehumidifying line R3 for supplying a part of the refrigerant circulating in the refrigerant circulation line R to the evaporator 160 is provided on the refrigerant circulation line R in order to perform dehumidification in the car in the heat pump mode Respectively.

At this time, since the low-temperature refrigerant is supplied to the evaporator 160 in order to dehumidify the inside of the car, the dehumidifying line R3 is connected to a section where the low-temperature refrigerant circulates in the refrigerant circulation line R.

More specifically, the dehumidifying line R3 is installed to supply a part of the low-temperature refrigerant that has passed through the orifice 128 of the first valve 120 to the evaporator 160 side.

That is, the dehumidifying line R3 is installed to connect the outlet-side refrigerant circulation line R of the first valve 120 and the inlet-side refrigerant circulation line R of the evaporator 160.

The inlet of the dehumidifying line R3 is connected to the refrigerant circulation line R between the first valve 120 and the outdoor heat exchanger 130 so that the refrigerant passing through the first valve 120 A part of the refrigerant before it flows into the outdoor heat exchanger 130 flows to the dehumidifying line R3 and is supplied to the evaporator 160 side.

On the dehumidification line R3, only a portion of the refrigerant having passed through the first valve 120 is allowed to flow into the dehumidification line R3 only in the dehumidification mode of the passenger compartment, Off valve 195 is provided.

The on-off valve 195 opens the dehumidifying line R3 only in the dehumidifying mode, and closes the dehumidifying line R3 when it is not in the dehumidifying mode.

Accordingly, when the on-off valve 195 is opened in the dehumidifying mode, a part of the refrigerant passing through the orifice 128 of the first valve 120 flows to the evaporator 160 through the dehumidifying line R3, Therefore, it is possible to smoothly carry out dehumidification in the car interior.

The outlet of the dehumidifying line R3 is connected to the expansion means 140 but the refrigerant having passed through the dehumidifying line R3 is not expanded in the expansion means 140, .

That is, the expansion means 140 includes an expansion valve 144 for expanding the refrigerant as shown in FIG. 6, and a bypass valve 147 for bypassing the expansion valve 144 140a.

At this time, the outlet of the dehumidifying line R3 is connected to the bypass line 147 of the expansion valve 140a, and the refrigerant passing through the dehumidification line R3 flows through the bypass line 147, The steam is supplied to the evaporator 160 by bypassing the evaporator 144.

6, an expansion valve 140 is disposed between the inlet and outlet 142a and 142b so as to expand the refrigerant supplied to the evaporator 160. The expansion valve 140 is provided with an expansion valve 140, A main body 141 formed with a first flow path 142 and a second flow path 143 through which the refrigerant discharged from the evaporator 160 flows and a main body 141 installed in the main body 141 to adjust the opening degree of the expansion flow path 144 A valve body 145 that adjusts the flow rate of the refrigerant passing through the expansion passage 144 and an evaporator 145 that is installed in the body 141 so as to move up and down, And a rod 146 for moving up and down the valve body 145 in accordance with the temperature change of the refrigerant at the outlet side of the valve body 145.

A diaphragm (not shown) is disposed at an upper end of the main body 141 to be displaced according to a temperature change of the refrigerant flowing in the second flow path 143. Accordingly, the rod 146 is moved up and down according to the displacement of the diaphragm to operate the valve body 145.

The bypass passage 147 is formed in the body 141 so as to communicate with the outlet 142b of the first passage 142 downstream of the expansion passage 144 in the refrigerant flow direction do.

The refrigerant having passed through the dehumidifying line R3 bypasses the expansion passage 144 of the expansion means 140 through the bypass passage 147 and is directly supplied to the evaporator 160. [

Meanwhile, since the outlet of the dehumidifying line (R3) is inserted and assembled into the bypass flow path (147) of the expansion means (140), the dehumidifying line (R3) can be easily assembled. Weight can be reduced.

The dual pipe heat exchanger 210 is installed to exchange heat between the refrigerant discharged from the outdoor heat exchanger 130 and flowing into the expansion means 140 and the refrigerant discharged from the evaporator 160.

The double pipe heat exchanger 210 schematically illustrates the dual pipe heat exchanger 210. In the dual pipe heat exchanger 210, an inner pipe and an outer pipe are formed in a double pipe structure.

At this time, the inner pipe is connected to the inlet side refrigerant circulation line (R) of the expansion means (140), and the outer pipe is connected to the outlet side refrigerant circulation line (R) of the evaporator (160). It could, of course, be connected in the opposite way.

Therefore, since the high-temperature refrigerant discharged from the outdoor heat exchanger 130 and the low-temperature refrigerant discharged from the evaporator 160 exchange heat with each other, the temperature of the refrigerant flowing into the inflating unit 140 is lowered, And the liquid refrigerant contained in the refrigerant discharged from the evaporator 160 can be evaporated to prevent the liquid refrigerant from flowing into the compressor 100.

In the present invention, a control unit (not shown) is provided for switching the flow direction of the refrigerant through the switching of the direction of the second valve 191 when the mode is changed between the air conditioner mode and the heat pump mode.

That is, the control unit may change the direction of the second valve 191 to change between the air conditioning mode and the heat pump mode when the mode change signal is inputted by automatic control or passenger control of the passenger.

At this time, when the mode change signal is inputted between the air conditioner mode and the heat pump mode, the controller controls the direction switching of the second valve 191 to be delayed for a predetermined time and then to perform the direction change.

That is, when the mode is changed between the air conditioner mode and the heat pump mode, the direction of the second valve 191 is not immediately changed but is delayed by a predetermined time and then the direction is switched.

The reason why the switching of the second valve 191 is delayed for a predetermined time when the mode change signal is input between the air conditioner mode and the heat pump mode is that the pressure of the refrigerant circulating through the refrigerant circulation line R is lower than a predetermined pressure When the pressure of the refrigerant is reduced, pressure parallel between the high pressure side and the low pressure side is established in the refrigerant circulation line (R).

When the mode change signal is input between the air conditioner mode and the heat pump mode, the direction of the second valve 191 is delayed for a predetermined time to reduce the pressure of the refrigerant circulating in the refrigerant circulation line R to a predetermined pressure or less The second valve 191 is controlled so as to change its direction so that noise and vibration due to the refrigerant pressure difference can be prevented.

In addition, when the mode change signal is input between the air conditioner mode and the heat pump mode, the control unit not only delays the changeover of the second valve 191, The opening / closing operation of the door 125 is delayed by a predetermined time and then controlled to perform the opening / closing operation.

That is, when the mode change signal is inputted between the air conditioner mode and the heat pump mode, the direction of the second valve 191 is switched and the on / off valve 125 is opened and closed. At this time, Off valve 125 is controlled to be delayed for a certain period of time so as to prevent the second valve 191 and the on / off valve 125 from opening and closing.

When the mode change signal is input between the air conditioner mode and the heat pump mode, the controller turns off the compressor 100 and then switches the direction of the second valve 191 and the on- The operation of opening and closing the door 125 is delayed for a predetermined time.

That is, rather than delaying the direction of the second valve 191 and only opening and closing the on-off valve 125, the compressor 100 is first turned off and then the second valve 191 and the on- 125 may be delayed to reduce the pressure of the refrigerant circulating in the refrigerant circulation line R to a predetermined pressure or less.

At this time, it is preferable that the direction of the second valve 191 and the opening / closing operation of the on-off valve 125 are performed after the pressure of the refrigerant is reduced to 10 kgf / cm ² or less.

It is preferable that when the mode change signal is input between the air conditioner mode and the heat pump mode, the change signal is input from the heat pump mode to the air conditioner mode.

A cooling water line (not shown) is connected to the heat supply unit 180 to supply electric waste heat to the heat supply unit 180. A cooling water switching valve (not shown) is installed in the cooling water line. The cooling water switching valve is also turned off.

7, the delay time of the switching of the second valve 191 and the opening / closing operation of the on-off valve 125 is increased or decreased in proportion to the outside air temperature.

7, it can be seen that the delay time decreases as the outside air temperature decreases, and the delay time increases as the outside air temperature increases. That is, the lower the outside air temperature, the faster the pressure balance between the high pressure side and the low pressure side of the refrigerant circulation line R becomes.

The delay time according to the outside temperature of FIG. 7 is preferably applied when changing from the heat pump mode to the air conditioning mode.

On the other hand, when the valve member 127 of the on-off valve 125 is opened and closed by a motor, when the mode change signal is input between the air conditioner mode and the heat pump mode, The rotational operation speed of the valve member 127 is controlled so as to delay the operation for a predetermined time.

The control unit sequentially performs the switching of the direction of the second valve 191 and the opening and closing of the on-off valve 125 with a time difference.

In other words, when the mode change signal is inputted between the air conditioner mode and the heat pump mode, preferably, when the change signal is inputted from the air conditioner mode to the heat pump mode, the controller 100 is turned off first, After the delay, the direction of the second valve 191 is changed. -> 1 second, the opening / closing operation of the on-off valve 125 is performed, and the compressor 100 is turned on after 1 second.

That is, in the air conditioner mode, because the refrigerant does not flow to the bypass line R1 side and the bypass line R1 is in a low-pressure state, the problem of the instantaneous switching of the second valve 191 upon inputting a change- That is, the direction of the refrigerant flowing toward the expansion means 140 side is immediately switched to the bypass line R 1 side, the high-pressure refrigerant flows to the low-pressure side while the noise and vibration due to the refrigerant pressure difference and the low-pressure water-cooled heat exchanger 181 ). ≪ / RTI >

The pressure difference between the second valve 191 side and the first valve 120 side in the refrigerant circulation line R is different from that at the time of changing the direction of the second valve 191, (10) seconds after the compressor 100 is turned off and the compressor (100) is turned off upon input of the change signal from the air conditioner mode to the heat pump mode because the pressure difference of the first valve (191) And the opening / closing operation of the on-off valve 125 is performed after 1 second.

That is, the delay time is given to the on-off valve 125 located on the side of the refrigerant circulation line R where the pressure difference largely acts between the second valve 191 and the on-off valve 125.

When a change signal is input from the air conditioner mode to the heat pump mode, a time difference is generated between the switching of the second valve 191 and the opening and closing of the on-off valve 125 after a predetermined time (10 seconds) This is done sequentially.

On the other hand, the controller controls the compressor 100 to be turned on after switching the direction of the second valve 191 and opening and closing the on-off valve 125.

When the key switch of the vehicle or the heat pump system is turned off immediately after the vehicle is operated in the air conditioning mode and the change signal is input to the heat pump mode (including automatic change and manual change) The control unit calculates the delay time (10 seconds) from the time when the vehicle is turned off or the heat pump system is turned off.

That is, since the compressor 100 is turned off when the key-off of the vehicle or the heat pump system is turned off, the delay time is calculated from this point.

When the vehicle is operated in the heat pump mode, the controller turns on the vehicle immediately after the key off of the vehicle or the heat pump system is turned off and inputs a change signal to the air conditioning mode. Off or the delay time from the time when the heat pump system is turned off.

On the other hand, when the vehicle is in the heat pump mode, even though it is turned on immediately after the key off of the vehicle or the heat pump system is turned off during the operation in the heat pump mode, 2 valve 191 is switched to the original mode when the vehicle is restarted (the key-on of the vehicle or the heat pump system is turned on).

Hereinafter, the operation of the vehicle heat pump system according to the present invention will be described.

end. Air conditioning mode (cooling mode) (Fig. 2)

2, the auxiliary bypass line R2 is closed through the third valve 192 and the bypass line R1 is closed through the second valve 191. In this case, And the first valve 120 opens the on-off valve 125. As shown in FIG.

The cooling water circulating through the electrical component 200 is not supplied to the water-cooled heat exchanger 181 of the heat supply unit 180.

On the other hand, at the time of maximum cooling, the temperature control door 151 in the air conditioning case 150 is operated to close the passage through the indoor heat exchanger 110, so that the air blown into the air conditioning case 150 by the blower Is cooled while passing through the evaporator (160), and is then supplied to the interior of the vehicle by bypassing the indoor heat exchanger (110), thereby cooling the interior of the vehicle.

Next, the refrigerant circulation process will be described.

The high-temperature, high-pressure gaseous refrigerant discharged from the compressor 100 after being compressed is supplied to the indoor heat exchanger 110 installed in the air conditioning case 150.

The refrigerant supplied to the indoor heat exchanger 110 flows through the first valve 120 without heat exchange with air because the temperature control door 151 closes the passage on the side of the indoor heat exchanger 110 as shown in FIG. And flows to the outdoor heat exchanger 130.

The refrigerant flowing into the outdoor heat exchanger 130 is condensed while exchanging heat with the outside air, thereby changing the gaseous refrigerant into the liquid refrigerant.

Meanwhile, both the indoor heat exchanger 110 and the outdoor heat exchanger 130 serve as a condenser, but the refrigerant mainly condenses in the outdoor heat exchanger 130, which exchanges heat with outside air.

Subsequently, the refrigerant passing through the outdoor heat exchanger 130 is decompressed and expanded in the course of passing through the expansion means 140 to be a low-temperature low-pressure liquid-phase refrigerant, and then flows into the evaporator 160.

The refrigerant flowing into the evaporator 160 is heat-exchanged with the air blown into the air conditioning case 150 through the blower to evaporate, and at the same time, the air is cooled by an endothermic effect due to the latent heat of evaporation of the refrigerant. And supplied to the vehicle interior to be cooled.

Then, the refrigerant discharged from the evaporator 160 flows into the compressor 100 and recycles the cycle as described above.

I. Heat pump mode (Figure 3)

In the heat pump mode, the auxiliary bypass line R2 is closed through the third valve 192, the bypass line R1 is opened through the second valve 191, The refrigerant is not supplied to the expansion means 140 and the evaporator 160 side.

In addition, the on-off valve 125 of the first valve 120 is closed to perform a refrigerant expansion through the orifice 128.

On the other hand, the cooling water heated by the vehicle electrical component 200 is supplied to the cooling water heat exchanger 181b of the water-cooled heat exchanger 181 serving as the heat supply means 180.

In the heat pump mode, the temperature control door 151 in the air conditioning case 150 is operated to close the passage bypassing the indoor heat exchanger 110, so that the air blown into the air conditioning case 150 by the blower Passes through the indoor heat exchanger 110 after passing through the evaporator 160 (operation stop), and is converted into hot air to be supplied to the interior of the vehicle, thereby heating the interior of the vehicle.

Next, the refrigerant circulation process will be described.

The high-temperature, high-pressure gaseous refrigerant discharged from the compressor 100 after being compressed is introduced into the indoor heat exchanger 110 installed inside the air conditioning case 150.

The high-temperature, high-pressure gaseous refrigerant introduced into the indoor heat exchanger 110 is condensed while exchanging heat with the air blown into the air conditioning case 150 through the blower. At this time, air passing through the indoor heat exchanger 110 After changing to hot air, it is supplied to the interior of the vehicle, and the interior of the vehicle is heated.

Subsequently, the refrigerant discharged from the indoor heat exchanger (110) is decompressed and expanded in the process of passing through the orifice (128) of the first valve (120) to become the low temperature low pressure liquid refrigerant, (130).

The refrigerant supplied to the outdoor heat exchanger 130 is evaporated while exchanging heat with the outside air and then passes through the bypass line R1 by the second valve 191. At this time, Exchanges heat with the cooling water passing through the cooling water heat exchanging unit 181b in the course of passing through the refrigerant heat exchanging unit 181a of the water-cooled heat exchanger 181 to recover the waste heat of the vehicle electrical equipment 200, (100) and recycle the cycle as described above.

All. The dehumidifying mode of the heat pump mode (Figure 4)

The dehumidifying mode of the heat pump mode is operated when dehumidification of the passenger compartment is required while the heat pump mode of Fig. 3 is operating.

Therefore, only the portions different from the heat pump mode of FIG. 3 will be described.

In the dehumidifying mode, the dehumidifying line (R3) is further opened through the on-off valve (195) in the heat pump mode.

In the dehumidifying mode, the temperature control door 151 in the air conditioning case 150 is operated to close the passage bypassing the indoor heat exchanger 110, so that the air blown into the air conditioning case 150 by the blower After passing through the evaporator 160, the refrigerant passes through the indoor heat exchanger 110 and is converted into hot air to be supplied to the interior of the vehicle, thereby heating the interior of the vehicle.

At this time, since the amount of the refrigerant supplied to the evaporator 160 is small, the air cooling performance is low, so that the change in the room temperature is minimized, and the air passing through the evaporator 160 is dehumidified smoothly.

Next, the refrigerant circulation process will be described.

The refrigerant passing through the orifices 128 of the compressor 100, the indoor heat exchanger 110 and the first valve 120 passes through the outdoor heat exchanger 130, (R3).

The refrigerant having passed through the outdoor heat exchanger 130 is evaporated while being exchanged heat with the outside air and then passes through the bypass line R1 by the second valve 191. At this time, The refrigerant is heat-exchanged with the cooling water passing through the cooling water heat exchanging part 181b in the process of passing through the refrigerant heat exchanging part 181a of the water-cooling type heat exchanger 181 to evaporate the waste heat of the vehicle electrical appliance 200,

The refrigerant that has passed through the dehumidifying line (R3) is supplied to the evaporator (160) and evaporates in the process of heat exchange with air flowing inside the air conditioning case (150).

In this process, the air passing through the evaporator 160 is dehumidified, and the dehumidified air passing through the evaporator 160 is converted into hot air while passing through the indoor heat exchanger 110, Dehumidification is heated.

Then, the refrigerant having passed through the water-cooled heat exchanger 181 and the evaporator 160 is combined and then flows into the compressor 100, and recycles the cycle as described above.

100: compressor 110: indoor heat exchanger
115: Electric heater
120: first valve 125: on-off valve
128: Orifice
130: outdoor heat exchanger 140: expansion means
150: air conditioning case 151: temperature control door
160: Evaporator 170: Accumulator
180: Heat supply unit 181: Water-cooled heat exchanger
191: second valve 192: third valve
195: On-off valve 200: Electrical part
210: double pipe heat exchanger
R: Refrigerant circulation line R1: Bypass line
R2: auxiliary bypass line R3: dehumidifying line

Claims (15)

A plurality of devices including a compressor 100, an indoor heat exchanger 110, a first valve 120, an outdoor heat exchanger 130 and an evaporator 160 are connected to a refrigerant circulation line R, R) is provided with a bypass line (R1) and a second valve (191) for bypassing a specific one of the plurality of devices,
And a control unit for switching a flow direction of the refrigerant through a direction change of the second valve (191) when a mode change signal is inputted between the air conditioner mode and the heat pump mode,
Wherein the controller controls to change the direction of the second valve (191) after a predetermined time delay when the mode change signal is input. The method according to claim 1,
The first valve 120 includes an on-off valve 125 installed on a refrigerant circulation line R between the indoor heat exchanger 110 and the outdoor heat exchanger 130 to turn on and off refrigerant flow, Off valve 125 and an orifice 128 for expanding the refrigerant,
In the air conditioning mode, the on-off valve 125 is opened to cause the refrigerant to flow into the unexpanded state. In the heat pump mode, the on-off valve 125 is closed to expand the refrigerant through the orifice 128, The heat pump system for a vehicle. 3. The method of claim 2,
Wherein the controller controls the opening and closing operation of the on-off valve (125) to be delayed by a predetermined time and then performs an opening and closing operation when the mode change signal is inputted. The method of claim 3,
The control unit first turns off the compressor 100 when the mode change signal is input and then switches the direction of the second valve 191 and the opening and closing operations of the on- The heat pump system for a vehicle. 5. The method of claim 4,
Wherein the control unit sequentially performs the switching of the direction of the second valve (191) and the opening / closing operation of the on-off valve (125) sequentially with a time difference from each other. 5. The method of claim 4,
Wherein when the mode change signal is input, a change signal is input from the heat pump mode to the air conditioner mode. 6. The method of claim 5,
Wherein when the mode change signal is input, a change signal is input from the air conditioner mode to the heat pump mode. 5. The method of claim 4,
Wherein the controller (112) controls the compressor (100) to be turned on after switching the direction of the second valve (191) and opening and closing the on-off valve (125) Heat pump system. The method according to claim 1,
Wherein the delay time of the second valve (191) is increased or decreased in proportion to the temperature of outside air. The method according to claim 1,
The bypass line R1 is provided to connect an outlet side refrigerant circulation line R of the outdoor heat exchanger 130 and an inlet side refrigerant circulation line R of the compressor 100,
Wherein the second valve (191) is installed at a branch point between the bypass line (R1) and the refrigerant circulation line (R). The method according to claim 1 or 3,
When the vehicle is operated in the air conditioning mode, the vehicle is turned on immediately after the key off of the vehicle or the heat pump system is turned off,
Wherein the control unit calculates the delay time from when the key-off of the vehicle or the heat pump system is turned off. The method according to claim 1 or 3,
When the key switch of the vehicle is turned on or the heat pump system is turned off again during the operation in the heat pump mode,
Wherein the control unit calculates the delay time from when the key-off of the vehicle or the heat pump system is turned off. 3. The method of claim 2,
The on-off valve 125 includes a valve member 127 having the orifice 128 formed therein for opening and closing the refrigerant passage 126 formed therein,
And a solenoid (129) for operating the valve member (127) is installed on one side of the on-off valve (125). 3. The method of claim 2,
The on-off valve 125 includes a valve member 127 having the orifice 128 formed therein for opening and closing the refrigerant passage 126 formed therein,
Wherein a motor for rotating the valve member (127) is provided on one side of the on-off valve (125). 15. The method of claim 14,
Wherein the control unit controls the rotational operation speed of the valve member (127) so as to delay the opening / closing operation of the valve member (127) for a predetermined time when the mode change signal is inputted.

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