KR101340472B1 - Heat pump system for vehicle - Google Patents

Abstract

The present invention relates to a vehicle heat pump system, and more particularly, in a heat pump system having a bypass line and a branch line installed on a refrigerant circulation line, an expansion valve function for expanding a refrigerant flowing through the refrigerant circulation line; By installing the combined valve device to perform the on-off valve function to open and close the branch line, it is possible to simultaneously perform the expansion valve function and the open / close valve function in one composite valve device, simplifying the refrigerant line as well as the heat pump system The present invention relates to a vehicle heat pump system capable of compacting, thereby securing a space in a narrow vehicle engine room.

Description

[0001] Heat pump system for vehicle [0002]

The present invention relates to a vehicle heat pump system, and more particularly, in a heat pump system having a bypass line and a branch line installed on a refrigerant circulation line, an expansion valve function for expanding a refrigerant flowing through the refrigerant circulation line; By installing the combined valve device to perform the on-off valve function to open and close the branch line, it is possible to simultaneously perform the expansion valve function and the open / close valve function in one composite valve device, simplifying the refrigerant line as well as the heat pump system The present invention relates to a vehicle heat pump system capable of compacting, thereby securing a space in a narrow vehicle engine room.

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.

The vehicle heat pump system shown in FIG. 1 includes a compressor 30 for compressing and discharging a refrigerant, a high pressure side heat exchanger 32 for dissipating the refrigerant discharged from the compressor 30, and a parallel structure. The first expansion valve 34 and the first opening and closing valve 36 for selectively passing the refrigerant passing through the high pressure side heat exchanger 32, and the first expansion valve 34 or the first opening and closing valve 36 The outdoor unit 48 for heat-exchanging the refrigerant having passed through the outside, the low pressure side heat exchanger 60 for evaporating the refrigerant passing through the outdoor unit 48, and the refrigerant passing through the low pressure side heat exchanger 60 are separated from the gas phase. Accumulator (62) for separating liquid phase refrigerant, internal heat exchanger (50) for exchanging refrigerant supplied to the low pressure side heat exchanger (60), refrigerant returned to the compressor (30), and the low pressure side heat exchanger Second expansion valve 56 for selectively expanding the refrigerant supplied to the machine 60 And a bypass line 58a installed in parallel with the second expansion valve 56 and the low pressure side heat exchanger 60, and connecting the outlet side of the outdoor unit 48 and the inlet side of the accumulator 62. And a second opening / closing valve 58 for opening and closing the bypass line 58a.

1, reference numeral 10 denotes an air conditioning case in which the high-pressure side heat exchanger 32 and the low-pressure side heat exchanger 60 are incorporated, reference numeral 12 denotes a temperature control door for controlling the mixing amount of cold air and warm air, And an air blower installed at the entrance of the air conditioning case.

The first opening and closing valve 36 and the second expansion valve 56 are closed and the first expansion valve 34 And the second on-off valve 58 are opened. In addition, the temperature control door 12 operates as shown in Fig. Therefore, the refrigerant discharged from the compressor 30 is the high pressure side heat exchanger 32, the first expansion valve 34, the outdoor unit 48, the high pressure part 52 of the internal heat exchanger 50, and the second open / close valve 58. Then, the accumulator 62 and the low pressure part 54 of the internal heat exchanger 50 are sequentially returned to the compressor 30. That is, the high-pressure side heat exchanger 32 serves as a radiator, and the outdoor unit 48 serves as an evaporator.

When the air conditioning mode (cooling mode) is activated, the first opening / closing valve 36 and the second expansion valve 56 are opened, and the first expansion valve 34 and the second opening / closing valve 58 are closed. Further, the temperature control door 12 closes the high-pressure side heat exchanger 32 passage. Accordingly, the refrigerant discharged from the compressor 30 may include the high pressure side heat exchanger 32, the first open / close valve 36, the outdoor unit 48, the high pressure unit 52 of the internal heat exchanger 50, and the second expansion valve 56. The low pressure side heat exchanger (60), the accumulator (62), and the low pressure portion (54) of the internal heat exchanger (50) are returned to the compressor (30). That is, the low-pressure side heat exchanger 60 serves as an evaporator, and the high-pressure side heat exchanger 32 closed by the temperature control door 12 serves as a radiator as in the heat pump mode do.

The vehicle heat pump system is provided with not only a bypass line 58a for bypassing the circulating coolant, but also a branch line for branching a predetermined amount of the circulating coolant and supplying it to a specific site, although not shown in the drawing. On the line through which the coolant flows, a three-way valve (not shown) for switching the flow direction of the coolant, on / off valves 36 and 58 for opening and closing the flow of the coolant, and expansion valves 34 and 56 for expanding the coolant are provided.

However, in the conventional vehicle heat pump system, a pipe such as the bypass line 58a and the branch line, the three-way valve, the opening / closing valves 36 and 58 and the expansion valves 34 and 56 have a narrow engine room of the vehicle. As it is arranged in close together, the structure of the refrigerant line (pipe) is complicated, as well as each valve is installed separately, there is a problem that the heat pump system takes up a lot of space.

An object of the present invention for solving the above problems is an expansion valve function and the branch line to expand the refrigerant flowing through the refrigerant circulation line in a heat pump system provided with a bypass line and a branch line on the refrigerant circulation line. By installing the combined valve device to perform the opening / closing valve function, the expansion valve function and the opening / closing valve function can be simultaneously performed in one composite valve device, thereby simplifying the refrigerant line and making the heat pump system compact. Accordingly, the present invention provides a vehicle heat pump system capable of securing a space in a narrow vehicle engine room.

In order to achieve the above object, the present invention provides a refrigerant circulation line in which each device including a compressor, an indoor heat exchanger, an outdoor heat exchanger, an expansion unit, and an evaporator is installed, and a specific section of the refrigerant circulation line, A bypass line for allowing the refrigerant flowing along the refrigerant circulation line to bypass the specific device according to a mode or a heat pump mode, and by branching a predetermined amount of the refrigerant flowing along the bypass line and the refrigerant circulation line, respectively. In the vehicle heat pump system comprising a branch line for supplying to the device side, A composite valve device comprising an expansion valve unit for expanding the refrigerant flowing through the refrigerant circulation line, and an on-off valve unit for opening and closing the branch line It is characterized by including.

The present invention provides a heat pump system in which a bypass line and a branch line are installed on a refrigerant circulation line to perform an expansion valve function for expanding a refrigerant flowing through the refrigerant circulation line and an on / off valve function for opening and closing the branch line. By installing the combined valve device, it is possible to simultaneously perform the expansion valve function and the open / close valve function in a single composite valve device, which simplifies the refrigerant line (piping) and makes the heat pump system compact. Space can be reserved for a vehicle engine room.

In addition, a refrigerant circulation passage and a branch passage are formed in the composite valve device, an expansion valve for expanding the refrigerant is provided on the expansion passage side in the refrigerant circulation passage, and an opening / closing valve is provided on the branch passage, thereby providing the expansion valve and the Through the control of the on / off valve, the heat pump mode can be diversified like the maximum heating mode, heating mode, dehumidification mode, and defrost mode, thereby improving the efficiency of the heat pump system and improving heating performance and maintaining heating performance. In addition, the mileage of the vehicle can be increased by minimizing the operation of the electric heater.

1 is a schematic view showing a conventional heat pump system for a vehicle,
FIG. 2 is a view showing an air conditioning mode of a heat pump system for a vehicle according to the present invention,
3 is a cross-sectional view showing a composite valve device in FIG.
4 is a block diagram showing a first heating mode during the heat pump mode operation of the vehicle heat pump system according to the present invention,
5 is a cross-sectional view showing a composite valve device in FIG.
Figure 6 is a block diagram showing a second heating mode during the heat pump mode operation of the vehicle heat pump system according to the present invention,
7 is a cross-sectional view showing a composite valve device in FIG.
8 is a block diagram showing a dehumidification mode of the heat pump mode operation of the vehicle heat pump system according to the present invention,
9 is a block diagram showing a defrost mode of the heat pump mode operation of the vehicle heat pump system according to the present invention,
FIG. 10 is a cross-sectional view illustrating the combined valve device of FIG. 9. FIG.

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

The vehicle heat pump system according to the present invention includes a compressor 100, an indoor heat exchanger 110, an outdoor heat exchanger 130, expansion means, and an evaporator 160 on a refrigerant circulation line R of an air conditioning system. Each device including a) is installed and configured, and is preferably applied to an electric vehicle or a hybrid vehicle.

In addition, bypass lines R1 and R4 for allowing a refrigerant flowing along the refrigerant circulation line R to bypass the specific device in a specific section of the refrigerant circulation line R according to an air conditioner mode or a heat pump mode. And a branch line R2 for branching a predetermined amount of refrigerant flowing along the bypass line R1 and the refrigerant circulation line R to a specific device.

Here, the bypass lines R1 and R4 may include a first bypass line R1 for bypassing the evaporator 160 and a second bypass line R4 for bypassing the outdoor heat exchanger 130. The first and second bypass lines R1 and R4 are connected in parallel to the refrigerant circulation line R, respectively.

In addition, the expansion means is installed at two points, one expansion means 120 is an expansion line (R3) connected in parallel on the refrigerant circulation line connecting the indoor heat exchanger 110 and the outdoor heat exchanger (130). The expansion means is installed on the inlet refrigerant circulation line (R) of the evaporator 160, wherein the other expansion means is installed on the inlet refrigerant circulation line (R) of the evaporator (160). The expansion means is an expansion valve 320 of the composite valve device 300 to be described later.

The first three-way valve 191 is installed at the branch point of the second bypass line R4, and the second three-way valve 192 is installed at the branch point of the expansion line R3. The three-way valve 193 for switching the refrigerant flow direction is also installed at the branch point of the first bypass line R1.

In addition, a branch line (R2) is provided to connect the first bypass line (R1) and the inlet refrigerant circulation line (R) of the evaporator 160, the branch line (R2) is the composite valve device ( And a branch passage 313 which communicates the refrigerant circulation passage 311 and the bypass line (first bypass line R1) in 300, and an on / off valve 330 is provided on the branch passage 313. Is installed.

Accordingly, in the air conditioner mode, as shown in FIG. 2, the refrigerant discharged from the compressor 100 is expanded to the indoor heat exchanger 110, the outdoor heat exchanger 130, the three-way valve 193, and the combined valve device 300. 320, the evaporator 160 and the compressor 100 are sequentially circulated, and at this time, the indoor heat exchanger 110 serves as a condenser (heater).

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

In the heat pump mode (first heating mode), the refrigerant discharged from the compressor 100 as shown in Figure 4 is the indoor heat exchanger 110, expansion means 120, outdoor heat exchanger 130, three-way valve ( 193), the first bypass line R1 and the compressor 100 are sequentially circulated, wherein the indoor heat exchanger 110 serves as a condenser (heater) and the outdoor heat exchanger 130 is an evaporator. It serves as 160, the refrigerant is not supplied to the evaporator 160.

As described above, the heat pump system of the present invention has the same refrigerant circulation direction in the air conditioner mode and the heat pump mode, and the refrigerant circulation except for the first and second bypass lines R1 and R4 and the expansion line R3. By sharing all the sections of the line R, it is possible to prevent the refrigerant congestion that occurs when the refrigerant does not flow, and to simplify the entire refrigerant circulation line (R).

In the present invention, the heat pump mode is diversified as the first heating mode, the second heating mode, the dehumidifying mode, and the defrosting mode depending on the outdoor temperature, the heat load, or the purpose.

At this time, the controller not shown performs the first heating mode or the dehumidification mode or the defrost mode during the heat pump mode operation when the outdoor temperature is higher than the reference temperature, and the second heating mode during the heat pump mode operation when the outdoor temperature is lower than the reference temperature. Will be performed.

Here, the reference temperature of the outdoor temperature for performing the first heating mode, the dehumidification mode or the defrost mode during the heat pump mode operation is 0 ℃ or more (image), the reference of the outdoor temperature for performing the second heating mode during the heat pump mode operation The temperature is below 0 ° C. (subzero).

Of course, the reference temperature of the outdoor temperature is not limited to 0 占 폚, but may be changed according to the purpose.

The refrigerant circulation path for each mode will be briefly described as follows.

In the first heating mode, as shown in FIG. 4, after the refrigerant discharged from the compressor 100 passes through the indoor heat exchanger 110, the expansion means 120, and the outdoor heat exchanger 130, the three-way valve ( In 193, the flow direction is changed to flow into the first bypass line R1, and the refrigerant introduced into the first bypass line R1 is circulated to the compressor 100 through the heat supply means 180. Is done.

In the dehumidification mode, as shown in FIG. 8, after the refrigerant discharged from the compressor 100 passes through the indoor heat exchanger 110, the expansion means 120, and the outdoor heat exchanger 130, the three-way valve 193. ) And the flow direction is changed to face the first bypass line (R1), some of the refrigerant to the first bypass line (R1) is the heat supply means 180 of the first bypass line (R1) It is circulated to the compressor 100, and part is made to circulate to the compressor 100 via the evaporator 160 through the branch passage 313 of the combined valve device 300 which is the branch line (R2).

In the defrost mode, as shown in FIG. 9, after the refrigerant discharged from the compressor 100 passes through the indoor heat exchanger 110 and the outdoor heat exchanger 130, the refrigerant circulation passage of the composite valve device 300 ( Some of the refrigerant introduced into 311 and expanded by the expansion valve 320 and expanded by the expansion valve 320 to flow through the refrigerant circulation passage 311 passes through the evaporator 160 to the compressor 100. And, part is made to circulate to the compressor 100 via the heat supply means 180 of the first bypass line (R1) through the branch passage 313 of the composite valve device 300 which is the branch line (R2). .

In the second heating mode, as shown in FIG. 6, the refrigerant discharged from the compressor 100 passes through the indoor heat exchanger 110 and the expansion means 120 and then flows to the second bypass line R4. Bypassing the outdoor heat exchanger 130, the refrigerant passing through the second bypass line (R4) is changed in the flow direction in the three-way valve (193) to face the first bypass line (R1) Some of the refrigerant directed to the first bypass line R1 circulates to the compressor 100 via the heat supply means 180 of the first bypass line R1, and some of the refrigerant flows through the branch line R2. It is made to circulate to the compressor 100 via the evaporator 160 through the branch passage 313 of the phosphorus composite valve device 300.

In addition, the compressor 100 installed on the refrigerant circulation line R receives power from an engine (an internal combustion engine or a motor), drives the refrigerant, compresses the refrigerant, and discharges the gas in a high temperature and high pressure gas state.

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, The refrigerant having passed through the first bypass line R1 is sucked, compressed, and supplied to the indoor heat exchanger 110 side.

In addition, in the second heating mode, the dehumidification mode, or the defrost mode during the heat pump mode operation, the first bypass line R1 and the evaporator 160 through the branch passage 313 of the combined valve device 300 described later. Since the refrigerant is supplied at the same time, in this case, the compressor 100 passes through the first bypass line R1 and the evaporator 160, and sucks and compresses the combined refrigerant to supply the indoor heat exchanger 110. .

For reference, the second heating mode during the heat pump mode operation is a mode that operates when the outdoor temperature is below zero, and the heating performance is lower than the first heating mode.

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 And the refrigerant supplied to the compressor 100 is heat-exchanged.

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

The evaporator 160 serves as an evaporator in the air conditioner mode, and is stopped because the refrigerant is not supplied in the first heating mode during the heat pump mode operation, and the refrigerant is partially in the second heating mode, the dehumidification mode, and the defrost mode. Supplied to act as an evaporator.

At this time, the performance of the evaporator 160 in the second heating mode, the dehumidification mode and the defrost mode during the heat pump mode operation is lower than the performance of the evaporator 160 in the air conditioning mode.

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.

Therefore, in the air conditioner mode in which the evaporator 160 serves as the evaporator, as shown in FIG. 2, the low temperature low pressure refrigerant expanded through the expansion valve 320 of the composite valve device 300 is transferred to the evaporator 160. Supplied, and at this time, air flowing in the air conditioning case 150 through a blower (not shown) is exchanged with cold refrigerant of low temperature and low pressure inside the evaporator 160 in the course of passing through the evaporator 160 to be converted into cold air. The air is discharged into the vehicle interior to cool the interior of the vehicle.

4, the high-temperature and high-pressure refrigerant discharged from the compressor 100 is supplied to the indoor heat exchanger 110 through the indoor heat exchanger 110. In the heat pump mode (first heating mode) in which the indoor heat exchanger 110 serves as a condenser Temperature and pressure inside the indoor heat exchanger 110 in the course of the air flowing inside the air conditioning case 150 through the blower (not shown) through the indoor heat exchanger 110. At this time, Exchanges heat with the refrigerant, and is then discharged to the vehicle interior to heat the vehicle interior.

The size of the evaporator 160 may be larger than the size of the indoor heat exchanger 110.

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 heater 115 as an auxiliary heat source at the start of the vehicle. Of course, the electric heater 115 may serve as an auxiliary heating not only during the start-up but also during the heat pump mode operation.

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

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,

In this case, when the air conditioner mode completely closes the front side passage of the indoor heat exchanger 110 through the temperature control door 151 as shown in FIG. 2, the cold air passing through the evaporator 160 is indoor heat exchanger 110. Since the bypass is supplied to the vehicle interior, the maximum cooling is performed, and in the heat pump mode (first heating mode), the indoor heat exchanger 110 is bypassed through the temperature control door 151 as shown in FIG. 4. When the passage is completely closed, all the air passes through the indoor heat exchanger 110 serving as a condenser (heater), and is converted into warm air, and the warm air is supplied into the vehicle, so the maximum heating is performed.

Meanwhile, when the position of the temperature control door 151 is adjusted, the temperature of the air discharged into the passenger compartment can be appropriately adjusted. For example, in the air conditioning mode, the temperature control door 151 is operated, Some of the cold air passing through the evaporator 160 bypasses the indoor heat exchanger 110 and part of the cold air passes through the indoor heat exchanger 110 It is changed into warm air. Thereafter, the cold air and the hot air are mixed to control the temperature of the inside of the car to an appropriate temperature. In addition, since the air passes through the evaporator 160 serving as an evaporator, dehumidification is also performed.

In addition, in the present invention, the evaporator 160 dehumidifies the interior of the vehicle in the second heating mode, the dehumidification mode, and the defrost mode in which some refrigerant is supplied to the evaporator 160 during the heat pump mode operation. .

As described above, in the present invention, the dehumidification function of the passenger compartment can be operated even in the air condition mode as well as the heat pump mode.

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 through the refrigerant circulation line R and the outdoor air. Let's go.

Here, the outdoor heat exchanger 130 is installed on the front side of the vehicle engine room to heat exchange the refrigerant flowing inside with the outdoor air.

The outdoor heat exchanger 130 serves as the same condenser as the indoor heat exchanger 110 in the air conditioner mode, where the high temperature refrigerant flowing inside the outdoor heat exchanger 130 is condensed as it exchanges heat with outdoor air. do.

In the heat pump mode (first heating 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 performs heat exchange with the outdoor air And evaporates.

In addition, the heat pump system according to the present invention is provided with a combined valve device 300, the combined valve device 300, expansion valve unit (expansion means) for expanding the refrigerant flowing through the refrigerant circulation line (R) And, it comprises an opening and closing valve unit for opening and closing the branch line (R2).

That is, the expansion valve unit and the open / close valve unit are integrally formed in one composite valve device 300, thereby enabling the expansion valve function and the open / close valve function to be performed, thereby simplifying the refrigerant line (piping) as well as the heat. It is possible to compact the pump system, thereby securing a space in a narrow engine compartment.

The combined valve device 300 includes a main body 310, a branch passage 313, an expansion valve 320, and an open / close valve 330.

The main body 310 is connected to the refrigerant circulation line (R) is a refrigerant circulation passage 311 is formed therein so that the refrigerant flowing through the refrigerant circulation line (R) passes through.

The main body 310 is installed on the inlet side refrigerant circulation line R of the evaporator 160, and the refrigerant circulation passage 311 is formed to penetrate one side and the lower side of the main body 310.

The inlet 311a of the refrigerant circulation passage 311 is connected to the outlet refrigerant circulation line R of the outdoor heat exchanger 130, and the outlet 311b is an inlet refrigerant circulation line of the evaporator 160. Connected to R).

At this time, the inlet (311a) of the refrigerant circulation passage 311 is a three-way valve (193) installed at the branch point of the outlet refrigerant circulation line (R) and the first bypass line (R1) of the outdoor heat exchanger (130). ).

Here, the first bypass line (R1) is installed to connect the outlet side refrigerant circulation line (R) of the outdoor heat exchanger 130 and the outlet side refrigerant circulation line (R) of the evaporator (160), In the heat pump mode, the refrigerant discharged from the outdoor heat exchanger 130 bypasses the evaporator 160 through the first bypass line R1.

In this case, an inlet of the first bypass line R1 is connected to the three-way valve 193.

In addition, the branch passage 313 is formed inside the main body 310 and communicates the refrigerant circulation passage 311 and the first bypass line R1.

The branch passage 313 serves as the branch line R2, and communicates the refrigerant circulation passage 311 and the first bypass line R1 to the inside of the main body 310 instead of a separate pipe. This is done by forming a passage.

In addition, an expansion passage 314 is formed in the refrigerant circulation passage 311 in which the refrigerant circulation passage 311 is reduced to expand the refrigerant passing through the refrigerant circulation passage 311.

Here, the expansion passage 314 is formed in a direction perpendicular to the inlet (311a) of the refrigerant circulation passage (311).

On the other hand, the refrigerant circulation passage 311 is formed in a form shifted in the vertical direction, with the expansion passage 314 interposed therebetween.

At this time, up and down ends of the refrigerant circulation passage 311 communicate with each other through the expansion passage 314.

In addition, the outlet 311b of the refrigerant circulation passage 311 is formed in a direction perpendicular to the inlet 311a of the refrigerant circulation passage 311.

On the other hand, the expansion passage 314 may be formed directly in the refrigerant circulation passage 311 of the main body 310, as shown in the drawing by installing a separate member 314a in the refrigerant circulation passage 311 The expansion passage 314 may be configured.

In addition, the expansion valve 320 is installed in the main body 310 and serves as the expansion valve part, and selectively selects a refrigerant flowing through the refrigerant circulation passage 311 according to an air conditioner mode or a heat pump mode. Inflated.

The expansion valve 320 is coupled to an expansion passage 314 for expanding the refrigerant passing through the refrigerant circulation passage 311 and one side of the main body 310 facing the expansion passage 314. One side is composed of a first driving device 321 is provided with an operating unit 322 to operate to open and close the expansion passage 314.

In addition, a first opening and closing plate 323 having a diameter larger than that of the expansion passage 314 may be provided on the outer circumferential surface of one end of the operation portion 322 to smoothly open and close the expansion passage 314.

On the other hand, the first opening and closing plate 323 and the expansion passage 314 provided in the operation unit 322 of the first drive device 321 constitutes the expansion valve portion.

In addition, the first driving device 321 is preferably a stepping motor for linearly reciprocating the operation part 322.

Therefore, in the air conditioner mode, the operating unit 322 is operated by the first driving device 321 to be raised, and thus the first opening and closing plate 323 provided at the end of the operating unit 322 is The expansion passage 314 is opened. Thereafter, the refrigerant discharged from the outdoor heat exchanger 130 side passes through the refrigerant circulation passage 311 of the composite valve device 300 by changing the direction of the three-way valve 193, wherein the refrigerant circulation passage 311 In the process of passing through the expansion passage 314 of the) is expanded, the expanded refrigerant is supplied to the evaporator 160 side through the outlet (311b) of the refrigerant circulation passage (311).

In the heat pump mode, the operation unit 322 is operated to descend by the first driving device 321, and thus the first opening and closing plate 323 provided at the end of the operation unit 322 is The expansion passage 314 is closed. Thereafter, the refrigerant discharged from the outdoor heat exchanger 130 side is supplied to the compressor 100 through the first bypass line R1 by changing the direction of the three-way valve 193 to the expansion valve 320. The evaporator 160 will be bypassed.

As such, the expansion valve 320 of the composite valve device 300 opens and closes the expansion passage 314 formed on the refrigerant circulation passage 311 through the operation unit 322 according to the air conditioner mode or the heat pump mode. To selectively expand the refrigerant.

The on / off valve 330 is installed on the main body 310 and serves as the on / off valve part to selectively open and close the branch passage 313 according to an air conditioner mode or a heat pump mode.

In addition, the branch passage 313 is formed in the opening and closing hole (313a) that is opened and closed by the opening and closing valve 330. At this time, the opening and closing hole (313a) is formed concentric with the operation portion 332 of the second drive device 331 to be described later.

The opening and closing valve 330 is coupled to one side of the main body 310 facing the opening and closing hole (313a), and one side is provided with an operating unit 332 for reciprocating toward the opening and closing hole (313a) The second driving device 331 and the outer circumferential surface of the operation unit 332 is provided with a second opening and closing plate 333 for opening and closing the opening and closing hole (313a) when the operation unit 332 is operated.

The operation part 332 passes through the center of the opening and closing hole 313a, and the second opening and closing plate 333 is formed larger than the diameter of the opening and closing hole 313a to open and close the opening and closing hole 313a. .

Here, the second driving device 331 is preferably a solenoid for linearly reciprocating the operation part 332.

In addition, a support plate 334 having a larger diameter than the second opening and closing plate 333 is provided on an outer circumferential surface of the operation part 332 spaced apart from the second opening and closing plate 333 by a predetermined distance, and the branch passage 313 is provided. In one side of the support plate 334, an elastic member 335 for elastically supporting the support plate 334 is installed.

That is, when the power is applied, the second driving device 331 raises the operating part 332 to close the opening and closing hole 313a, but when the power is cut off, the elastic member 335 By the operation portion 332 is lowered to the initial position to open the opening and closing hole (313a).

In addition, the operation unit 332 and the second opening and closing plate 333 may be inserted into the branch passage 313 inside the main body 310 between the second driving device 331 and the branch passage 313. The through hole 316 is formed to be.

The through hole 316 is formed concentrically with the support plate 334 and is in close contact with a sealing member provided on an outer circumferential surface of the support plate 334. As a result, the support plate 334 seals and penetrates the through-hole 316 while the support plate 334 moves up and down in the through-hole 316 during the elevating operation of the operation unit 332 by the second driving device 331. The refrigerant is prevented from leaking to the ball 316 side.

When the opening / closing hole 313a is opened by the opening / closing valve 330, the refrigerant circulation passage 311 and the first bypass line R1 of the main body 310 are opened by the branch passage 313. Communicate.

Thus, in the mode in which the refrigerant flows in the refrigerant circulation passage 311, some of the refrigerant flowing in the refrigerant circulation passage 311 may flow toward the first bypass line R1 through the branch passage 313. In the mode in which the refrigerant flows in the first bypass line R1, some of the refrigerant flowing in the first bypass line R1 flows through the branch passage 313. After being supplied to the side will be able to flow to the evaporator 160 side.

And, when the second heating mode, dehumidification mode, defrost mode during the heat pump mode operation using the branch passage 313 and the opening and closing valve 330,

First, in the second heating mode during the heat pump mode operation, as shown in FIG. 6, some of the refrigerant flowing in the first bypass line R1 by the three-way valve 193 are water-cooled on the first bypass line R1. The waste heat of the vehicle electrical appliance 200 is recovered while passing through the heat exchanger 181, and part of the waste heat is discharged to the outlet 311b of the refrigerant circulation passage 311 through the branch passage 313 to pass through the evaporator 160. .

In the second heating mode as shown in FIG. 6, the outdoor heat exchanger 130 is operated through a second bypass line R4 to minimize the influence of low temperature outdoor air. In this case, the refrigerant flowing through the first bypass line (R1) through the branch passage 313 to recover the waste heat of the vehicle electrical equipment 200 and the heat source of the indoor air to improve the heating performance. The water-cooled heat exchanger 181 and the evaporator 160 will be supplied at the same time. Herein, indoor air is introduced into the air conditioning case 150 and is controlled in an air inflow mode so as to exchange heat with the evaporator 160.

In the dehumidification mode during the heat pump mode operation, as shown in FIG. 8, a part of the refrigerant flowing to the first bypass line R1 by the three-way valve 193 is a water-cooled heat exchanger on the first bypass line R1. The waste heat of the vehicle electrical appliance 200 is recovered while passing through 181, and part of the waste heat is discharged to the outlet 311 b of the refrigerant circulation passage 311 through the branch passage 313 to pass through the evaporator 160.

The dehumidification mode as shown in FIG. 8 is a mode in which the outdoor temperature is an image, and the refrigerant passing through the outdoor heat exchanger 130 to recover the heat source of the outdoor air and the waste heat of the vehicle electronics 200 is first Passing through the pass line (R1) passes through the water-cooled heat exchanger (181), at this time, a portion of the refrigerant flowing through the first bypass line (R1) branched through the branch passage 313 to supply to the evaporator 160 The air flowing inside the air conditioning case 150 is dehumidified.

In the defrost mode during the heat pump mode operation, the refrigerant flows to the refrigerant circulation passage 311 by the three-way valve 193 as shown in FIG. 9, and at this time, the expansion passage 314 on the refrigerant circulation passage 311 is opened. Some of the refrigerant expanded while passing through passes through the evaporator 160, and some passes through the water cooling heat exchanger 181 on the first bypass line R1 through the branch passage 313. Waste heat is recovered.

9 is a mode for defrosting the outdoor heat exchanger 130 which serves as the evaporator 160 when operating in the first heating mode as shown in FIG. It operates to supply a high-temperature refrigerant to the outdoor heat exchanger 130 to defrost. At this time, a portion of the expansion refrigerant passed through the expansion passage 314 on the refrigerant circulation passage 311 after passing through the outdoor heat exchanger 130 By branching through the branch passage 313 and supplied to the water-cooled heat exchanger 181 to reduce the performance of the evaporator 160 to minimize the temperature change of the indoor air during the defrost mode operation.

In addition, a second bypass line R4 is installed in parallel in the refrigerant circulation line R such that the refrigerant passing through the expansion means 120 bypasses the outdoor heat exchanger 130. At the branch point of the pass line R4 and the refrigerant circulation line R, the refrigerant passing through the expansion means 120 flows to the outdoor heat exchanger 130 or the second bypass line R4 according to the outdoor temperature. The first three-way valve 191 for switching the flow direction of the refrigerant to be installed.

That is, when the outdoor temperature is an image, the refrigerant is controlled to flow to the outdoor heat exchanger 130 through the control of the first three-way valve 191, and when the outdoor temperature is below zero, the first three-way valve 191. The refrigerant is controlled to bypass the outdoor heat exchanger 130 and flow to the second bypass line R4.

Here, when the outdoor temperature is below zero, the refrigerant passing through the expansion means 120 bypasses the outdoor heat exchanger 130 as in the second heating mode of FIG. 6 so as to minimize the influence of low temperature outdoor air. To the second bypass line R4, and the refrigerant passing through the second bypass line R4 flows first through the first bypass line R1 by the three-way valve 193. It is supplied to the water-cooled heat exchanger 181 on the bypass line (R1) to recover the waste heat of the vehicle electrical equipment 200, a part is supplied to the evaporator 160 through the branch passage (313).

At this time, indoor air is introduced into the air conditioning case 150 and is controlled to be in an air inflow mode so as to exchange heat with the evaporator 160, so that the refrigerant supplied to the evaporator 160 recovers the heat source of the indoor air .

As such, in a low heat source condition at which the outdoor temperature is below zero, the refrigerant bypasses the outdoor heat exchanger 130 through the second bypass line R4 to minimize the influence of low temperature outdoor air, and further, the first The refrigerant flowing through the bypass line (R1) branched through the branch passage 313, part of the evaporator 160 to recover the waste heat of the vehicle electronics 200 through the water-cooled heat exchanger 181, and part of the heat exchange with the indoor air By recovering the heat source of the indoor air through it, it is possible to improve the heating performance.

On the other hand, the control unit, if both the outdoor temperature and the indoor temperature after the vehicle start is below the reference temperature (0 ℃) to operate the electric heating heater 115 to perform the initial heating, after which the indoor temperature is above the reference temperature (0 ℃) In this case, the air inflow mode is controlled to be an inflow mode so that indoor air is introduced into the air conditioning case 150, and then the second heating mode as shown in FIG. 6 is operated.

As described above, the present invention recovers the waste heat of the vehicle electrical equipment 200 and the heat source of the outdoor air under the condition that the outdoor temperature is an image, and the waste heat of the vehicle electrical equipment 200 and the heat source of the indoor air when the outdoor temperature is below zero. In addition to the recovery, the heat pump mode is set according to the heat load and the purpose, such as the first heating mode (FIG. 4), the second heating mode (FIG. 6), the dehumidification mode (FIG. 8), and the defrost mode (FIG. 9). By varying the efficiency of the heat pump system to maintain the heating performance, it is possible to increase the mileage of the vehicle (electric vehicle or hybrid vehicle) by minimizing the operation of the electric heating heater 115.

In addition, the expansion means 120 installed on the refrigerant circulation line R connecting the indoor heat exchanger 110 and the outdoor heat exchanger 130 has the outdoor heat exchanger 130 according to an air conditioner mode or a heat pump mode. The refrigerant supplied to is selectively expanded.

The expansion means 120, the expansion line (R3) connected in parallel on the refrigerant circulation line (R) connecting the indoor heat exchanger 110 and the outdoor heat exchanger 130, and the expansion line (R3) Is installed on the expansion valve 121 for expanding the refrigerant.

In addition, at the branching point of the expansion line (R3) and the refrigerant circulation line (R), the refrigerant passing through the indoor heat exchanger 110 in accordance with the air conditioning mode or the heat pump mode passes through the outsole valve 121 Alternatively, a second three-way valve 192 for changing a refrigerant flow direction to bypass the expansion valve 121 is installed.

Here, the expansion means 120 may be used in addition to the expansion valve 121 orifice (not shown).

Therefore, in the air conditioner mode, the refrigerant discharged from the compressor 100 by the second three-way valve 192 and passed through the indoor heat exchanger 110 bypasses the expansion valve 121 to the outdoor heat exchanger. 130, and

In the heat pump mode (first heating mode), the refrigerant discharged from the compressor 100 by the second three-way valve 192 and passed through the indoor heat exchanger 110 passes through the expansion valve 121. After being expanded while passing, the outdoor heat exchanger 130 is supplied.

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

The heat supply unit 180 is a refrigerant heat exchanger through which the refrigerant flowing through the first bypass line R1 flows to supply the waste heat of the vehicle electronics 200 to the refrigerant flowing through the first bypass line R1. A water-cooled heat exchanger 181 including a portion 181a and a coolant heat exchanger 181b provided at one side of the refrigerant heat exchanger 181a and having a coolant circulating in the vehicle electrical equipment 200 flows therethrough. It is done by

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.

Here, the heat supply means 180 will be described in more detail, and is composed of a cooling water circulation line (W), a water cooling radiator 210, a cooling water bypass line (W1), and a cooling water three-way valve (230).

The cooling water circulation line W connects the vehicle electrical component 200 and the water-cooled radiator 210 to circulate the cooling water to the vehicle electrical component 200.

At this time, a water pump 220 is provided on the cooling water circulation line W for circulating cooling water.

Although two electrical components 200 are connected to the cooling water circulation line W in the drawing, the number of the electrical components 200 is variable.

The water-cooled radiator 210 is installed on the cooling water circulation line W so as to cool the cooling water circulating in the cooling water circulation line W to cool the vehicle electrical equipment 200, The cooling water circulating in the line W is heat-exchanged.

At this time, a blowing fan 215 is installed on one side of the water-cooled radiator 210 to blow outdoor air toward the water-cooled radiator 210, thereby improving the cooling performance of the cooling water circulating through the cooling water circulation line W.

The cooling water bypass line W1 connects the cooling water circulation line W and the cooling water heat exchanger 181b of the water-cooling type heat exchanger 181 in parallel to each other through the water pump 220, Passes through the water-cooled radiator 210 and flows to the cooling water heat exchanger 181b.

In addition, the cooling water three-way valve 230 is installed at the branch point of the cooling water bypass line (W1) and the cooling water circulation line (W) to switch the flow direction of the cooling water in accordance with the air conditioning mode or the heat pump mode.

Therefore, in the heat pump mode, the cooling water passing through the electrical equipment 200 by the operation of the water pump 220 bypasses the water cooling radiator 210 by the cooling water three-way valve 230 and the water cooling heat exchanger ( 181 flows to the cooling water heat exchanger 181b, and in this process, the cooling water flowing through the cooling water heat exchanger 181b and the refrigerant flowing through the refrigerant heat exchanger 181a along the first bypass line R1 exchange with each other. The waste heat of the vehicle electronics 200 is recovered.

In the air conditioner mode, the coolant that has passed through the electrical equipment 200 by the operation of the water pump 220 circulates through the water cooling radiator 210 by the coolant three-way valve 230, and the circulating coolant in the process. Is cooled by heat exchange with the outdoor air to cool the electrical equipment (200).

On the other hand, as the cooling water three-way valve 230 is installed between the two electrical equipment 200, it is shown only to recover the waste heat of the first electrical equipment 200 in the cooling water flow direction, the cooling water three-way valve 230 ) Is installed at the outlet side of the second electrical appliance 200, it is possible to recover the waste heat of the two electrical appliances 200.

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 may be supplied to the compressor 100.

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

end. Air conditioning mode (cooling mode)

In the air conditioner mode (cooling mode), as shown in FIGS. 2 and 3, the inlet of the first bypass line R1 is closed through the three-way valve 193 and the refrigerant is provided through the first driving device 321. The circulation passage 311 and the expansion passage 314 are opened, the second bypass line R4 is closed through the first three-way valve 191, and the second three-way valve 192 is expanded to the expansion line R3. ) Will also be closed.

In addition, the coolant three-way valve 230 closes the coolant bypass line W1 and circulates through the water pump 220 to cool the vehicle electronics 200 and the water-cooled writer while circulating the vehicle electronics 200. Cooled.

On the other hand, during maximum cooling, the temperature control door 151 in the air conditioning case 150 operates to close a passage through the indoor heat exchanger 110 (condenser), and is blown into the air conditioning case 150 by a blower. After the air is cooled while passing through the evaporator 160, the indoor heat exchanger 110 is bypassed and supplied to the interior of the vehicle, thereby cooling the interior of the vehicle.

Next, the refrigerant circulation process will be described.

The high temperature and high pressure gaseous refrigerant discharged after being compressed by the compressor 100 is supplied to the indoor heat exchanger 110 (condenser role) installed in the air conditioning case 150.

As the refrigerant supplied to the indoor heat exchanger 110, the temperature control door 151 closes the passage of the indoor heat exchanger 110 side as shown in FIG. To the condenser).

The refrigerant flowing into the outdoor heat exchanger 130 is condensed as it exchanges heat with outdoor air, thereby converting the gaseous refrigerant into a liquid refrigerant.

On the other hand, both the indoor heat exchanger 110 and the outdoor heat exchanger 130 is condenser dynamics, but the refrigerant is mainly condensed in the outdoor heat exchanger 130 that exchanges heat with outdoor air.

Subsequently, the refrigerant passing through the outdoor heat exchanger 130 expands under reduced pressure in the process of passing through the expansion passage 314 of the refrigerant circulation passage 311 of the composite valve device 300 via the three-way valve 193. After the low temperature low-pressure liquid refrigerant is introduced 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. First heating mode during heat pump mode operation

The first heating mode during the heat pump mode operation is a mode in which the outdoor temperature is an image and uses waste heat of the outdoor air and the vehicle electrical appliance 200 as a heat source. As shown in FIGS. 4 and 5, the three-way valve ( An inlet of the first bypass line R1 is opened through 193, and a refrigerant circulation passage 311 and an expansion passage 314 are closed through the first driving device 321, and the evaporator 160 is closed. The coolant is not supplied to the side.

In addition, the second bypass line R4 is closed through the first three-way valve 191, and the expansion line R3 is opened through the second three-way valve 192.

On the other hand, the cooling water three-way valve 230 opens the cooling water bypass line (W1), the cooling water circulating through the water pump 220 passes through the vehicle electrical equipment 200, the water-cooled heat exchanger (181) Into the cooling water heat exchanger (181b) of the) continue to circulate. At this time, the cooling water heated by the vehicle electrical component 200 flows to the cooling water heat exchanger 181b of the water-cooled heat exchanger 181.

In the first heating mode, the temperature control door 151 in the air conditioning case 150 operates to close a passage that bypasses the indoor heat exchanger 110 (the condenser role), and the air conditioning case 150 is blown by the blower. After the air blown into the evaporator 160 (operation stop) passes through the indoor heat exchanger 110 is converted into warm air and supplied to the interior of the vehicle, thereby heating the interior of the vehicle interior.

Next, the refrigerant circulation process will be described.

The high temperature and high pressure gaseous refrigerant discharged after being compressed by the compressor 100 is introduced into an indoor heat exchanger 110 (condenser role) installed in 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 flows to the expansion line R3 through the second three-way valve 192, and the refrigerant flowing to the expansion line R3 passes through the expansion valve ( In the process of passing through 121, the product is expanded under reduced pressure to form a liquid refrigerant having a low temperature and low pressure, and then supplied to the outdoor heat exchanger 130 (evaporator role).

The refrigerant supplied to the outdoor heat exchanger 130 passes through a first bypass line R1 by the three-way valve 193 after evaporating while exchanging heat with outdoor air. The refrigerant passing through R1) exchanges heat with the cooling water passing through the cooling water heat exchanger 181b in the process of passing through the refrigerant heat exchanger 181a of the water-cooled heat exchanger 181 to recover the waste heat of the vehicle electrical equipment 200. After that, the cycle as described above is recycled while flowing into the compressor 100.

All. Second heating mode during heat pump mode

The heating mode during the heat pump mode operation is a mode that operates under conditions where the outdoor temperature is below zero, and uses the waste heat of the indoor air (pitch inflow mode) and the vehicle electrical appliance 200 as a heat source, as shown in FIGS. 6 and 7. An inlet of the first bypass line R1 is opened through a three-way valve 193, and the refrigerant circulation passage 311 and the expansion passage 314 are closed through the first driving device 321. The branch passage 313 is opened through the on / off valve 330.

In addition, a second bypass line R4 is opened through the first three-way valve 191, and the expansion line R3 is opened through the second three-way valve 192.

In addition, the cooling water three-way valve 230 opens the cooling water bypass line (W1), so that the cooling water circulated through the water pump 220 passes through the vehicle electronics (200), the water-cooled heat exchanger (181) Into the cooling water heat exchanger (181b) of the) continue to circulate. At this time, the cooling water heated by the vehicle electrical component 200 flows to the cooling water heat exchanger 181b of the water-cooled heat exchanger 181.

On the other hand, if the room temperature is a video condition, the air inflow mode of the air conditioner case 150 is controlled to be the air inflow mode, and the room air flows into the air conditioner case 150.

In the second heating mode, the temperature control door 151 in the air conditioning case 150 operates to close a passage that bypasses the indoor heat exchanger 110 (the condenser role), and the air conditioning case 150 is blown by the blower. After the air blown into the evaporator 160 (operation stop) passes through the indoor heat exchanger 110 is converted into warm air and supplied to the interior of the vehicle, thereby heating the interior of the vehicle interior.

Next, the refrigerant circulation process will be described.

The high temperature and high pressure gaseous refrigerant discharged after being compressed by the compressor 100 is introduced into an indoor heat exchanger 110 (condenser role) installed in 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 flows to the expansion line R3 through the second three-way valve 192, and the refrigerant flowing to the expansion line R3 passes through the expansion valve ( After expanding under reduced pressure in the process of passing through 121, the liquid refrigerant is cooled to low temperature and low pressure, and then flows to the second bypass line R4 while bypassing the outdoor heat exchanger 130.

At this time, since the refrigerant bypasses the outdoor heat exchanger (130), the influence of outdoor air at a low temperature is minimized.

Thereafter, the refrigerant passing through the second bypass line R4 passes through the first bypass line R1 by the three-way valve 193, and passes through the first bypass line R1. Some of the refrigerant may exchange heat with the cooling water passing through the cooling water heat exchanger 181b in the process of passing through the refrigerant heat exchanger 181a of the water-cooled heat exchanger 181 on the first bypass line R1. 200 is evaporated while recovering the waste heat, and a part of the waste heat is discharged to the outlet 311b of the refrigerant circulation passage 311 through the branch passage 313 and then supplied to the evaporator 160 to provide an interior of the air conditioning case 150. It is evaporated during heat exchange with the flowing indoor air.

The refrigerant that has passed through the water-cooled heat exchanger 181 and the evaporator 160 is combined and then flows into the compressor 100 to recycle the cycle as described above.

la. Dehumidification mode during heat pump mode operation

The dehumidification mode during the heat pump mode operation is performed under the condition that the outdoor temperature is an image, and uses the waste heat of the outdoor air and the vehicle electronics 200 as a heat source. As shown in FIG. 8, the dehumidification mode operates in the first heating mode of FIG. 4. It works when indoor dehumidification is needed.

Therefore, only the portions different from the first heating mode of FIG. 4 will be described.

In the dehumidification mode, the branch passage 313 is opened through the on / off valve 330 in the first heating mode.

In the dehumidification mode, the temperature control door 151 in the air conditioning case 150 operates to close the passage that bypasses the indoor heat exchanger 110 (the condenser role), and the blower enters the air conditioning case 150 by the blower. After the blown air is cooled in the course of passing through the evaporator 160, the air is converted into warm air while being passed through the indoor heat exchanger 110 and supplied to the interior of the vehicle, thereby heating the interior of the vehicle interior.

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 compressor 100, the indoor heat exchanger 110, the expansion valve 121, and the outdoor heat exchanger 130 passes through the first bypass line R1 by the three-way valve 193. In this case, some of the refrigerant passing through the first bypass line R1 passes through the refrigerant heat exchanger 181a of the water-cooled heat exchanger 181 on the first bypass line R1. Heat exchange with the coolant passing through the (181b) to evaporate while recovering the waste heat of the vehicle electrical equipment 200, a part is discharged to the outlet (311b) of the refrigerant circulation passage (311) through the branch passage (313) after the evaporator ( 160 is evaporated in the process of heat exchange with the air flowing through the interior of the air conditioning case 150.

In the process, dehumidification of air passing through the evaporator 160 is performed, and the dehumidified air passing through the evaporator 160 is changed into warm air while passing through the indoor heat exchanger 110 (condenser) and then the vehicle. It is supplied to the room and heated by dehumidification.

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.

hemp. Defrost mode during heat pump mode operation

The defrost mode during the heat pump mode operation operates under the condition that the outdoor temperature is an image, and uses the waste heat of the outdoor air and the vehicle electronics 200 as a heat source. As illustrated in FIGS. 9 and 10, the outdoor heat exchanger 130 It works when defrost is needed due to the problem of freezing.

In the defrost mode, when the outdoor heat exchanger 130 needs to be defrosted while operating in the first heating mode of FIG. 4, the refrigerant is operated in the air conditioner mode of FIG. 2 to supply the high temperature refrigerant to the outdoor heat exchanger 130. Supply and defrost.

In addition, in the defrost mode, the circulating direction of the coolant for recovering the waste heat of the vehicle electrical equipment 200 is the same as that of FIG. 4, and only the refrigerant is operated in the air conditioner mode of FIG. 2. The branch passage 313 is opened through.

In the defrost mode, the temperature control door 151 in the air conditioning case 150 operates to close a passage that bypasses the indoor heat exchanger 110 (the condenser role), and is blown into the air conditioning case 150 by a blower. After the blown air is cooled in the course of passing through the evaporator 160, the air is converted into warm air while being passed through the indoor heat exchanger 110 and supplied to the interior of the vehicle, thereby heating the interior of the vehicle interior.

At this time, since the amount of the refrigerant supplied to the evaporator 160 is small, the air cooling performance is low, thereby minimizing changes in the room temperature.

Next, the refrigerant circulation process will be described.

The high temperature and high pressure gaseous refrigerant discharged after being compressed by the compressor 100 is supplied to the indoor heat exchanger 110 (condenser role) installed in 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 high temperature refrigerant discharged from the indoor heat exchanger 110 flows to the outdoor heat exchanger 130 (which serves as a condenser) to defrost the outdoor heat exchanger 130.

Subsequently, the refrigerant passing through the outdoor heat exchanger 130 is depressurized in the process of passing through the expansion passage 314 on the refrigerant circulation passage 311 of the composite valve device 300 via the three-way valve 193. After being expanded to become a low-temperature low-pressure liquid refrigerant, it is supplied to the evaporator 160, wherein some of the expansion refrigerant passing through the expansion passage 314 passes through the branch passage 313 to the first bypass line. It flows to the (R1) side.

The refrigerant supplied to the evaporator 160 is evaporated by heat exchange with the air blown into the air conditioning case 150 through the blower, and the refrigerant supplied to the first bypass line R 1 flows through the water-cooled heat exchanger 181 Exchanges heat with the cooling water passing through the cooling water heat exchanging unit 181b to collect the waste heat of the vehicle electrical equipment 200 and evaporate.

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: expansion means 121: expansion valve
130: outdoor heat exchanger
150: air conditioning case 151: temperature control door
160: Evaporator 170: Accumulator
180: Heat supply unit 181: Water-cooled heat exchanger
181a: refrigerant heat exchanger 181b: cooling water heat exchanger
191: first three-way valve 192: second three-way valve
193: three-way valve
200: Electrical equipment 210: Water-cooled radiator
220: water pump 230: cooling water three-way valve
300: composite valve device 310: main body
311: refrigerant circulation passage 313: branch passage
314: expansion passage 316: through hole
320: expansion valve 321: first drive device
322: operation unit 323: first opening and closing plate
330: on-off valve
331: second drive unit 332: operating unit
333: second opening and closing plate 334: support plate
R: refrigerant circulation line R1: first bypass line
R2: branch line R3: expansion line
R4: 2nd bypass line

Claims (9)

Refrigerant circulation line (R) and each of the devices, including the compressor 100, the indoor heat exchanger 110, outdoor heat exchanger 130, expansion means, evaporator 160 is installed, and the refrigerant circulation line (R) A bypass line R1 installed in a specific section and allowing the refrigerant flowing along the refrigerant circulation line R to bypass the specific device according to the air conditioner mode or the heat pump mode, and the bypass line R1. In the vehicle heat pump system comprising a branch line (R2) for branching each of the refrigerant flowing along the refrigerant circulation line (R) to supply to a specific device side,
A vehicle heat pump comprising an expansion valve unit for expanding a refrigerant flowing through the refrigerant circulation line (R) and an open / close valve unit for opening and closing the branch line (R2). system. The method of claim 1,
The composite valve device 300,
A main body 310 having a refrigerant circulation passage 311 penetrating therein so as to be connected to the refrigerant circulation line R to allow the refrigerant flowing through the refrigerant circulation line R to pass therethrough;
A branch passage 313 formed inside the main body 310 and communicating with the refrigerant circulation passage 311 and the bypass line R1 to serve as the branch line R2;
An expansion valve 320 installed in the main body 310 and acting as the expansion valve part to selectively expand the refrigerant flowing in the refrigerant circulation passage 311 according to an air conditioner mode or a heat pump mode;
It is installed on the main body 310 and serves as the on-off valve, characterized in that it comprises an on-off valve 330 to selectively open and close the branch passage 313 in accordance with the air conditioning mode or heat pump mode. Automotive heat pump system. 3. The method of claim 2,
The expansion valve 320,
An expansion passage 314 formed inside the refrigerant circulation passage 311 and formed to reduce the refrigerant circulation passage 311 to expand the refrigerant passing through the refrigerant circulation passage 311;
The first driving device 321 is coupled to one side of the main body 310 facing the expansion passage 314 and one side is provided with an operating unit 322 that operates to open and close the expansion passage 314. Vehicle heat pump system, characterized in that made. The method of claim 3, wherein
The first driving device (321) is a vehicle heat pump system, characterized in that the stepping motor for linearly reciprocating the operating unit (322). 3. The method of claim 2,
An opening and closing hole 313a which is opened and closed by the on / off valve 330 is formed in the branch passage 313.
The opening and closing valve 330 is coupled to one side of the main body 310 facing the opening and closing hole (313a), and one side is provided with an operating unit 332 for reciprocating toward the opening and closing hole (313a) The second driving device 331,
Is provided on the outer circumferential surface of the operating unit 332, the vehicle heat pump system, characterized in that made of a second opening and closing plate (333) for opening and closing the opening and closing hole (313a) during the operation of the operating unit (332). The method of claim 5, wherein
The second driving device (331) is a vehicle heat pump system, characterized in that the solenoid to linearly reciprocate the operating unit (332). 3. The method of claim 2,
The inlet 311a of the refrigerant circulation passage 311 of the main body 310 is connected to the refrigerant circulation line R of the outlet side of the outdoor heat exchanger 130, and the outlet 311b is the inlet of the evaporator 160. Vehicle heat pump system, characterized in that connected to the refrigerant circulation line (R). The method of claim 5, wherein
A support plate 334 having a larger diameter than the second opening and closing plate 333 is provided on an outer circumferential surface of the operation part 332 spaced apart from the second opening and closing plate 333 by a predetermined distance, and in the branch passage 313. One side of the support plate 334 is a vehicle heat pump system, characterized in that the elastic member 335 is installed to support the support plate 334 elastically. The method of claim 1,
The bypass line R1 is installed to connect the outlet side refrigerant circulation line R of the outdoor heat exchanger 130 and the outlet side refrigerant circulation line R of the evaporator 160.
The three-way valve (193) for switching the refrigerant flow direction in accordance with the air conditioning mode or the heat pump mode is installed at the branch point of the outlet refrigerant circulation line (R) and the bypass line (R1) of the outdoor heat exchanger (130) A vehicle heat pump system.

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