KR20230000065A - Automotive air conditioning system - Google Patents

Abstract

The present invention relates to a vehicle cooling and heating system, which can improve heating performance, comprising: a compressor for compressing an introduced refrigerant to discharge the same in a high-temperature and high-pressure gaseous state; a first heat exchanger; a gas-liquid separator; a second heat exchanger; a third heat exchanger; a fourth heat exchanger; an expansion valve unit; an opening/closing valve unit; and a control unit.

Description

Vehicle air conditioning system {Automotive air conditioning system}

The present invention relates to a cooling and heating system for a vehicle, and more particularly, to a cooling and heating system for a vehicle that cools and heats a vehicle using a refrigerant heat-exchanged with cooling water in a second heat exchanger and a gaseous refrigerant separated in a gas-liquid separator.

Referring to Korean Patent Publication No. 10-2020-0061457 (2020.06.03.), an air conditioner for a vehicle typically includes a cooling system for cooling the interior of a vehicle and a heating system for heating the interior of the vehicle. . The cooling system is configured to cool the interior of the vehicle by exchanging heat with a refrigerant flowing inside the evaporator to exchange air passing through the outside of the evaporator with a refrigerant flowing inside the evaporator, thereby cooling the interior of the vehicle. It is configured to heat the interior of the vehicle by exchanging heat with the refrigerant and converting it into warmth.

On the other hand, the above-described air conditioner for vehicles uses a heat pump system capable of selectively performing cooling and heating by changing the flow direction of the refrigerant using one refrigerant cycle. For example, a plurality of heat exchangers and a flow of refrigerant A direction control valve, which is a three-way valve capable of switching directions, and a plurality of electronic expansion valves that selectively open and close a passage through which the refrigerant is moved while depressurizing the moving refrigerant are provided. Therefore, cooling and heating are possible according to the pressure reduction of the refrigerant by the plurality of electronic expansion valves (electronic expansion valve for heating, electronic expansion valve for cooling) and the flow direction of the refrigerant by the direction control valve. In addition, by using a plurality of 2-way valves instead of 3-way valves, the 2-way valves are selectively opened and closed to enable cooling and heating.

However, it is impossible to control the gas injection with the control of the existing electronic expansion valve for incoherent use, resulting in a problem in that the heating performance deteriorates.

The present invention has been created to solve the above problems, and additionally installs an electronic expansion valve for gas injection intermediate pressure to control the maximum performance through the electronic expansion valve for gas injection medium pressure while maintaining control of the existing electronic expansion valve for heating. It is an object of the present invention to provide a vehicle cooling and heating system capable of improving heating performance.

In order to achieve the above object, the present invention compresses the introduced refrigerant and discharges it in a high-temperature, high-pressure gaseous state; a first heat exchanger connected to the compressor by a first flow path, into which the high-temperature and high-pressure refrigerant discharged from the compressor flows in and heats the room in a heating mode by exchanging heat with the air flowing in the air conditioning case; It is connected to the first heat exchanger by a second flow path, takes in the refrigerant discharged from the first heat exchanger and temporarily stores it, separates the introduced refrigerant into liquid refrigerant and gaseous refrigerant, and separates the gaseous phase in the gas injection heating mode. a gas-liquid separator supplying refrigerant to the compressor through a branch passage; a second heat exchanger connected to the gas-liquid separator by a third flow path and condensing the refrigerant through heat exchange with cooling water by introducing the liquid refrigerant discharged from the gas-liquid separator; a third heat exchanger connected to the second heat exchanger by a fourth flow path and condensing the refrigerant by taking in the refrigerant discharged from the second heat exchanger and exchanging heat with external air; Connected to the third heat exchanger by a fifth flow path, connected to the compressor by a sixth flow path, and supplying the refrigerant discharged from the third heat exchanger to the interior of the vehicle through the air conditioning case while vaporizing the refrigerant a fourth heat exchanger that cools the interior of the vehicle by exchanging heat with air; an expansion valve unit provided on the second flow path, the third flow path, and the fifth flow path to expand and depressurize the refrigerant moving to the second flow path, the third flow path, and the fourth flow path; an on-off valve unit provided on a branch flow path connecting the gas-liquid separator and the compressor at a point where a bypass flow path branched off from the fourth flow path and connected to the sixth flow path diverges from the fourth flow path; and a control unit connected to the expansion valve unit and the opening/closing valve unit and controlling the operation of the expansion valve unit, opening/closing of the opening/closing valve unit, and opening/closing directions corresponding to respective modes.

The cooling and heating system for vehicles according to the present invention is provided on the first flow path, the branch flow path, and the sixth flow path, and measures the temperature and pressure of the refrigerant moving to the first flow path, the branch flow path, and the sixth flow path, The sensor unit may further include a sensor unit disposed adjacent to the third heat exchanger to measure a temperature of outside air, and the sensor unit may be connected to the control unit.

In the cooling and heating system for a vehicle according to the present invention, the expansion valve is provided at the front end of the gas-liquid separator on the second flow path, and expands and reduces the refrigerant supplied to the gas-liquid separator from the first heat exchanger in the gas injection heating mode. A first electronic expansion valve for intermediate pressure of gas injection and a refrigerant provided at the front end of the second heat exchanger on the third flow path and supplied from the gas-liquid separator to the second heat exchanger in heating mode and gas injection heating mode A second electronic expansion valve for heating that expands and reduces pressure, and is provided at the front end of the fourth heat exchanger on the fifth flow path, and expands and reduces the refrigerant supplied from the third heat exchanger to the fourth heat exchanger in the cooling mode. It may include a solenoid expansion valve for cooling.

The on-off valve part is provided on the fourth flow path at a point where the bypass flow path diverges, and the first on-off valve converts the flow of the refrigerant moving to the fourth flow path, and a branch flow path connecting the gas-liquid separator and the compressor. It may include a second opening/closing valve provided on the top and selectively opening and closing the branch flow path. The first opening/closing valve may be a 3-way valve, and the second opening/closing valve may be a 2-way valve.

The sensor unit includes a high-pressure PT sensor provided on the first flow path to measure the temperature and pressure of the refrigerant moving from the compressor to the first heat exchanger, and a high pressure PT sensor provided on the branch flow path to move from the gas-liquid separator to the compressor. a medium-pressure PT sensor for measuring the temperature and pressure of the gaseous refrigerant, a low-pressure PT sensor provided on the sixth flow path and measuring the temperature and pressure of the refrigerant moving from the fourth heat exchanger to the compressor; An outdoor air temperature sensor provided adjacent to the heat exchanger to measure the temperature of the outdoor air may be included.

In the cooling mode, the first on-off valve of the on-off valve part provided on the fourth flow path may open toward the third heat exchanger, and the second on-off valve of the on-off valve part provided on the branch flow path may be closed. The first electronic expansion valve of the expansion valve part provided on the second flow path and the second electronic expansion valve of the expansion valve part provided on the third flow path may be completely opened, and on the fifth flow path The solenoid expansion valve of the expansion valve unit provided at the front end of the fourth heat exchanger may expand the refrigerant supplied to the fourth heat exchanger while being opened.

In the heating mode, the first on-off valve of the on-off valve part provided on the fourth flow path can be opened in the direction of the bypass flow path, and the second on-off valve of the on-off valve part provided on the branch flow path can be closed. The first electronic expansion valve of the expansion valve part provided on the second flow path can be completely opened, and the second electronic expansion valve of the expansion valve part provided on the third flow path is opened to the second heat exchanger. The supplied refrigerant can be expanded.

In the gas injection heating mode, the first on-off valve of the on-off valve part provided on the fourth flow path may open in the direction of the bypass flow path, and the second on-off valve of the on-off valve part provided on the branch flow path may open. The second electronic expansion valve of the expansion valve part provided on the third flow path can be completely opened, and the first electronic expansion valve of the expansion valve part provided on the second flow path is opened while the gas-liquid separator The refrigerant supplied to the can be expanded.

In the vehicle cooling and heating system according to the present invention, the first electronic expansion valve for intermediate pressure of gas injection is additionally installed in front of the gas-liquid separator, thereby maintaining the control of the existing second electronic expansion valve for heating and the first electronic expansion valve for intermediate pressure of gas injection. It can be controlled to the maximum performance through this, so the heating performance of the vehicle cooling and heating system can be improved.

1 is a configuration diagram showing a cooling and heating system for a vehicle according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating a state in which a refrigerant is circulated in a cooling mode of the cooling and heating system for a vehicle shown in FIG. 1 .
FIG. 3 is a diagram illustrating a state in which a refrigerant is circulated in a heating mode of the cooling and heating system for a vehicle shown in FIG. 1 .
FIG. 4 is a diagram illustrating a state in which a refrigerant is circulated in the gas injection heating mode of the cooling and heating system for a vehicle shown in FIG. 1 .

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms or words used in this specification and claims should not be construed as being limited to the usual or dictionary meaning, and the inventor appropriately uses the concept of the term in order to explain his/her invention in the best way. It should be interpreted as a meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined.

1 to 4, a vehicle cooling and heating system 100 according to an embodiment of the present invention includes a compressor 1100, a first heat exchanger 1200, a gas-liquid separator 1300, and a second heat exchanger ( 1400), a third heat exchanger 1500, a fourth heat exchanger 1600, an expansion valve unit 1700, an on-off valve unit 1800, and a control unit 1900, including a sensor unit 2000 ) may further include.

Referring to FIG. 1 , in the vehicle cooling and heating system 100 according to an embodiment of the present invention, a compressor 1100, a first heat exchanger 1200, a gas-liquid separator 1300, and a second heat exchanger are installed on a refrigerant circulation line in which a refrigerant circulates. The group 1400, the third heat exchanger 1500, and the fourth heat exchanger 1600 are connected, and is preferably applied to an electric vehicle or a hybrid vehicle.

The compressor 1100 takes in and compresses the refrigerant through an input end connected to a passage through which the refrigerant flows, and then discharges the compressed refrigerant to the passage through an output end. At this time, the discharged refrigerant is a high-temperature and high-pressure refrigerant (refrigerant gas; gas ) is discharged.

The output end of the compressor 1100 is connected to the first flow path R1, and the input end of the first heat exchanger 1200 and the output end of the compressor 1100 are connected through the first flow path R1, so that the compressor The high-temperature and high-pressure refrigerant (gas) compressed in (1100) is output to the first heat exchanger (1200).

The first heat exchanger 1200 is provided in an air conditioning case (not shown), and the first heat exchanger 1200 transfers the high-temperature and high-pressure refrigerant (gas) discharged from the compressor 1100 to the first flow path R1. enter through The first heat exchanger 1200 condenses the high-temperature and high-pressure refrigerant (gas) supplied to the inside through heat exchange with air supplied to the vehicle interior through an air conditioning case (not shown), and heats the air with the condensed heat, Heating of the vehicle interior is provided. As the first heat exchanger 1200, it is preferable to use an indoor condenser provided inside an air conditioning case (not shown). Preferably, a PTC heater (not shown) is provided, and the PTC heater (not shown) serves to supply an insufficient heating heat source.

The structure of the air conditioning case (not shown) and the process of supplying the heat-exchanged air to the interior of the vehicle after the air conditioning case (not shown) draws in air to heat the vehicle are known technologies, and detailed descriptions thereof are omitted. I'm going to do it.

The output end of the first heat exchanger 1200 is connected to the second flow path R2, and the second flow path R2 is connected to the gas-liquid separator 1300. The gas-liquid separator 1300 takes in the refrigerant discharged from the first heat exchanger 1200 and temporarily stores the refrigerant, separates the introduced refrigerant into a gaseous refrigerant and a liquid refrigerant, and then removes the separated gaseous refrigerant in the gas injection heating mode. supplied to the compressor 1100. It is preferable that the gas-liquid separator 1300 and the compressor 1100 are connected by a branch passage QR, and on the second oil R2, a first electronic expansion valve 1720 of an expansion valve unit 1700 to be described later. ) is provided.

A heater rod (not shown) made of a carbon heating composite material may be provided inside the gas-liquid separator 1300 to vaporize the supplied liquid refrigerant, and a heater rod (not shown) inside the gas-liquid separator 1300 As provided, the superheat of the refrigerant supplied to the compressor 1100 through the branch passage QR can be increased, thereby improving heating efficiency.

The gas-liquid separator 1300 is connected to the second heat exchanger 1400 by a third flow path R3, and the second heat exchanger 1400 is connected to the gas-liquid separator 1300 through the third flow path R3. It serves to condense and evaporate the refrigerant by heat exchange with the cooling water flowing in the cooling water line (not shown) by introducing the refrigerant discharged from the cooling water line. A second electronic expansion valve 1720 of an expansion valve unit 1700 to be described later is provided on the third flow path R3, and a water-cooled condenser is preferably used as the second heat exchanger 1400.

The second heat exchanger 1400 is connected to the third heat exchanger 1500 through a fourth flow path R4. The third heat exchanger 1500 condenses the refrigerant introduced through the fourth flow path R4 through heat exchange with external air, and then discharges the refrigerant to the fifth flow path R5 through the output terminal. The fifth flow path R5 is connected to the fourth heat exchanger 1600 and supplies the refrigerant that is output after being condensed in the third heat exchanger 1500 to the fourth heat exchanger 1600 .

The third heat exchanger 1500 draws in refrigerant from the second heat exchanger 1400 and condenses the refrigerant through heat exchange with outside air. The third heat exchanger 1500 is a vehicle drive unit (drive motor, not shown) ), it is disposed close to the radiator unit (not shown) provided in the input side, condenses the refrigerant introduced through the input side by exchanging heat with the outside air, and then discharges it to the fifth flow path R5, and the third heat exchanger 1500 Outdoor capacitors are preferably used.

The fifth flow path R5 is connected to the fourth heat exchanger 1600 and supplies the refrigerant condensed in the third heat exchanger 1500 and then output to the fourth heat exchanger 1600, and the fourth heat exchanger 1600 The unit 1600 serves to cool the interior of the vehicle by exchanging heat with air supplied to the interior of the vehicle through an air conditioning case (not shown) while vaporizing the introduced refrigerant. An evaporator is preferably used as the fourth heat exchanger 1600, and the fourth heat exchanger 1600 is connected to the compressor 1100 through the sixth flow path R6.

An expansion valve unit 1700 is provided on the second flow path R2, the third flow path R3, and the fifth flow path R5, and the expansion valve unit 1700 is provided on the second flow path R2, It serves to expand and depressurize the refrigerant moving to the third flow path (R3) and the fifth flow path (R5).

The expansion valve unit 1700 includes a first electronic expansion valve 1710, a second electronic expansion valve 1720, and a solenoid expansion valve 1730. The first electronic expansion valve 1710 is used for gas injection intermediate pressure, and is provided at the front end of the gas-liquid separator 1300 on the second flow path R2 so that the gas-liquid in the first heat exchanger 1200 in the gas injection heating mode It serves to expand and depressurize the refrigerant supplied to the separator 1300, and it is preferable that the first electronic expansion valve 1710 is fully opened in the cooling mode and heating mode.

The second electronic expansion valve 1720 is used for heating and is provided at the front end of the second heat exchanger 1400 on the third flow path R3 to remove heat from the gas-liquid separator 1300 in heating mode and gas injection heating mode. It serves to expand and depressurize the refrigerant supplied to the second heat exchanger 1400, and the second electronic expansion valve 1720 is preferably fully opened in the cooling mode.

The solenoid expansion valve 1730 is used for cooling and is provided at the front end of the fourth heat exchanger 1600 on the fifth flow path R5 so that the third heat exchanger 1500 to the fourth heat exchanger (1730) in the cooling mode 1600) to expand and depressurize the refrigerant supplied, and the solenoid expansion valve 1730 is preferably closed in heating mode and gas injection heating mode.

On the branch flow path (QR) connecting the gas-liquid separator 1300 and the compressor 1100, the bypass flow path (BR) branched from the fourth flow path (R4) and connected to the sixth flow path (R6) is An on-off valve unit 1800 is provided at a branching point from the fourth flow path R4, and the on-off valve unit 1800 switches the flow of refrigerant moving to the fourth flow path R4 in response to each mode. and moves to the bypass passage BR or selectively opens and closes the branch passage QR.

The on-off valve unit 1800 includes a first on-off valve 1810 and a second on-off valve 1820. The first on-off valve 1810 is provided at a point where the bypass flow path BR is branched on the fourth flow path R4 and serves to switch the flow of refrigerant moving to the fourth flow path R4. , The second on-off valve 1820 is provided on a branch passageway (QR) connecting the gas-liquid separator 1300 and the compressor 1100, and serves to selectively open and close the branch passageway (QR). The first on/off valve 1810 is opened in the direction of the third heat exchanger 1500 in the cooling mode to supply the refrigerant discharged from the second heat exchanger 1400 to the third heat exchanger 1500, In the heating mode and the gas injection heating mode, it is opened in the direction of the bypass passage (BR) so that the refrigerant discharged from the second heat ventilator (1400) is supplied to the compressor (1100) through the bypass passage (BR).

The second on-off valve 1820 is closed in the cooling mode and heating mode to prevent the refrigerant discharged from the gas-liquid separator 1300 from being supplied to the compressor 1100, and is opened in the gas injection heating mode to allow the gas-liquid separator ( 1300) to supply the refrigerant discharged to the compressor 1100, the first on-off valve 1810 is preferably a 3-way valve, and the second on-off valve 1820 is a 2-way valve. .

The expansion valve unit 1700 and the on-off valve unit 1800 are connected to the control unit 1900, and the control unit 1900 controls the operation of the expansion valve unit 1700 and the on-off valve unit in response to each mode. It serves to control the opening and closing direction of the 1800, and the control unit 1900 is connected to the sensor unit 2000.

The sensor unit 2000 is provided on the first flow path R1, the branch flow path QR, and the sixth flow path R6, and the first flow path R1, the branch flow path QR, and the sixth flow path R6. It serves to measure the temperature and pressure of the refrigerant moving to the 6 flow path (R6) and serves to measure the temperature of the outside air by being disposed adjacent to the third heat exchanger (1500).

The sensor unit 2000 includes a high pressure PT sensor 2010, a medium pressure PT sensor 2020, a low pressure PT sensor 2030, and an outside temperature sensor (not shown). The high-pressure PT sensor 2010 is provided on the first flow path R1 and serves to measure the temperature and pressure of the high-pressure refrigerant moving from the compressor 1100 to the first heat exchanger 1200. . The intermediate pressure PT sensor 2020 is provided on the branch flow path QR and serves to measure the temperature and pressure of the gaseous refrigerant in an intermediate pressure state moving from the gas-liquid separator 1300 to the compressor 1100. .

The low pressure PT sensor 2030 is provided on the sixth flow path R6 and serves to measure the temperature and pressure of the refrigerant moving from the fourth heat exchanger 1600 to the compressor 1100, and the outside temperature A degree sensor (not shown) is provided adjacent to the third heat exchanger 1500 and serves to measure the temperature of the outside air. The control unit 2000 measures the temperature and pressure of the refrigerant moving to the first flow path R1, the branch flow path QR, and the sixth flow path R6, and measures the outside air adjacent to the third heat exchanger 1500. After measuring the temperature of , when it is transmitted to the controller 1900, the controller 1900 controls the expansion valve unit 1700 and the on-off valve unit 1800 based on the temperature of the outside air and the superheat of the refrigerant. to switch to each mode.

Referring to FIG. 2, the flow of refrigerant in the cooling mode is a compressor 1100, a first heat exchanger 1200, a gas-liquid separator 1300, a second heat exchanger 1400, a third heat exchanger 1500, a fourth While circulating through the heat exchanger 1600 and the compressor 1100, the interior of the vehicle is cooled.

The first on-off valve 1810 of the on-off valve unit 1800 provided on the fourth flow path R4 is opened toward the third heat exchanger 1500 and discharged from the second heat exchanger 1400. The refrigerant is supplied to the third heat exchanger 1500, and the refrigerant is not moved through the bypass passage BR. The second opening/closing valve 1820 of the opening/closing valve unit 1800 provided on the branch passage QR is closed so that the refrigerant discharged from the gas-liquid separator 1300 passes through the branch passage QR to the compressor 1100. It is supplied to the second heat exchanger 1400 while preventing it from being supplied to.

The first electronic type expansion valve 1710 of the expansion valve unit 1700 provided on the second flow path R2 and the second electromagnetic type expansion valve 1700 provided on the third flow path R3 The expansion valve 1720 is fully opened to move the refrigerant, and the solenoid expansion valve 1730 of the expansion valve unit 1700 provided at the front end of the fourth heat exchanger 1600 on the fifth flow path R5 While opening, the refrigerant supplied from the third heat exchanger 1500 to the fourth heat exchanger 1600 is expanded and reduced in pressure, and the refrigerant that has passed through the fourth heat exchanger 1600 is circulated to the compressor 1100.

Referring to FIG. 3 , in the heating mode, the flow of refrigerant circulates through the compressor 1100, the first heat exchanger 1200, the gas-liquid separator 1300, the second heat exchanger 1400, and the compressor 1100 while circulating the interior of the vehicle. heating will be performed.

The first on-off valve 1810 of the on-off valve part 1800 provided on the fourth flow path R4 is opened in the direction of the bypass flow path BR, and the refrigerant discharged from the second heat exchanger 1400 is supplied to the compressor 1100 through the bypass flow path BR while not being supplied to the third heat exchanger 1500. The second opening/closing valve 1820 of the opening/closing valve unit 1800 provided on the branch passage QR is closed so that the refrigerant discharged from the gas-liquid separator 1300 passes through the branch passage QR to the compressor 1100. It is supplied to the second heat exchanger 1400 while preventing it from being supplied to.

The first electronic expansion valve 1710 of the expansion valve unit 1700 provided on the second flow path R2 is fully opened to move the refrigerant, and the expansion valve provided on the third flow path R3 When the second electronic expansion valve 1720 of the unit 1700 is opened, the refrigerant supplied from the gas-liquid separator 1300 to the second heat exchanger 1400 is expanded and reduced in pressure, and passes through the second heat exchanger 1400. The refrigerant is circulated to the compressor 1100 through the bypass flow path BR.

Referring to FIG. 4, in the gas injection heating mode, the flow of refrigerant passes through the compressor 1100, the first heat exchanger 1200, and the gas-liquid separator 1300, and then part of the refrigerant passes through the second heat exchanger 1400, the compressor ( 1100), and another part of the refrigerant that has passed through the gas-liquid separator 1300 circulates through the branch passage QR to the compressor 1100 to heat the interior of the vehicle.

The first on-off valve 1810 of the on-off valve part 1800 provided on the fourth flow path R4 is opened in the direction of the bypass flow path BR, and the refrigerant discharged from the second heat exchanger 1400 is supplied to the compressor 1100 through the bypass flow path BR while not being supplied to the third heat exchanger 1500. The second on-off valve 1820 of the on-off valve part 1800 provided on the branch flow path QR is open, and the refrigerant discharged from the gas-liquid separator 1300 passes through the branch flow path QR to the compressor 1100. to be supplied with

The first electronic expansion valve 1710 of the expansion valve unit 1700 provided on the second flow path R2 expands the refrigerant supplied from the first heat exchanger 1200 to the gas-liquid separator 1300 while being opened. and the second electronic expansion valve 1720 of the expansion valve unit 1700 provided on the third flow path R3 is opened while supplying the gas-liquid separator 1300 to the second heat exchanger 1400 The refrigerant expands and depressurizes it. The refrigerant that has passed through the second heat exchanger 1400 is circulated to the compressor 1100 through the bypass passage BR, and part of the refrigerant that has passed through the gas-liquid separator 1300 passes through the branch passage QR It is circulated to the compressor 1100.

Therefore, by additionally installing the first electronic expansion valve 1710 for intermediate pressure of gas injection at the front end of the gas-liquid separator 1300, the control of the existing second electronic expansion valve 1720 for heating is maintained while maintaining the first intermediate pressure of gas injection. It can be controlled to the maximum performance through the electronic expansion valve 1710, so the heating performance of the vehicle cooling and heating system can be improved.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

100: vehicle heating and cooling system 1100: compressor
1200: first heat exchanger 1300: gas-liquid separator
1400: second heat exchanger 1500: third heat exchanger
1600: fourth heat exchanger 1700: expansion valve unit
1710: first electronic expansion valve 1720: second electronic expansion valve
1730: solenoid expansion valve 1800: on-off valve part
1810: first on-off valve 1820: second on-off valve
1900: control unit 2000: sensor unit
2010 : High pressure PT sensor 2020 : Medium pressure PT sensor
2030: low pressure PT sensor not shown: outdoor temperature sensor

Claims (8)

A compressor that compresses the introduced refrigerant and discharges it in a high-temperature, high-pressure gaseous state;
a first heat exchanger connected to the compressor by a first flow path, into which the high-temperature and high-pressure refrigerant discharged from the compressor flows in and heats the room in a heating mode by exchanging heat with the air flowing in the air conditioning case;
It is connected to the first heat exchanger by a second flow path, takes in the refrigerant discharged from the first heat exchanger and temporarily stores it, separates the introduced refrigerant into liquid refrigerant and gaseous refrigerant, and separates the gaseous phase in the gas injection heating mode. a gas-liquid separator supplying refrigerant to the compressor through a branched passage;
a second heat exchanger connected to the gas-liquid separator by a third flow path and condensing the refrigerant through heat exchange with cooling water by introducing the liquid refrigerant discharged from the gas-liquid separator;
a third heat exchanger connected to the second heat exchanger by a fourth flow path and condensing the refrigerant by taking in the refrigerant discharged from the second heat exchanger and exchanging heat with external air;
Connected to the third heat exchanger by a fifth flow path, connected to the compressor by a sixth flow path, and supplying the refrigerant discharged from the third heat exchanger to the interior of the vehicle through the air conditioning case while vaporizing the refrigerant a fourth heat exchanger that cools the interior of the vehicle by exchanging heat with air;
an expansion valve unit provided on the second flow path, the third flow path, and the fifth flow path to expand and depressurize the refrigerant moving to the second flow path, the third flow path, and the fourth flow path;
an on-off valve unit provided on a branch flow path connecting the gas-liquid separator and the compressor at a point where a bypass flow path branched off from the fourth flow path and connected to the sixth flow path diverges from the fourth flow path; and
and a control unit connected to the expansion valve unit and the opening/closing valve unit and controlling an operation of the expansion valve unit, opening/closing and opening/closing directions of the opening/closing valve unit in response to each mode.
The method of claim 1,
It is provided on the first flow path, the branch flow path, and the sixth flow path to measure the temperature and pressure of the refrigerant moving to the first flow path, the branch flow path, and the sixth flow path, and disposed adjacent to the third heat exchanger. And further comprising a sensor unit for measuring the temperature of the outside air,
The cooling and heating system for a vehicle, characterized in that the sensor unit is connected to the control unit.
The method of claim 1,
The expansion valve part,
A first electronic expansion valve for intermediate pressure of gas injection provided at the front end of the gas-liquid separator on the second flow path and expanding and reducing the refrigerant supplied from the first heat exchanger to the gas-liquid separator in the gas injection heating mode;
A second electronic expansion valve for heating provided on the third flow path at a front end of the second heat exchanger and expanding and reducing the refrigerant supplied from the gas-liquid separator to the second heat exchanger in a heating mode or a gas injection heating mode;
A solenoid expansion valve provided on the fifth flow path at a front end of the fourth heat exchanger and configured to expand and reduce the refrigerant supplied from the third heat exchanger to the fourth heat exchanger in a cooling mode. A cooling and heating system for a vehicle.
The method of claim 1,
The on-off valve part,
A first opening/closing valve provided at a branching point of the bypass passage on the fourth passage to switch the flow of the refrigerant moving to the fourth passage;
A second on-off valve provided on a branch passage connecting the gas-liquid separator and the compressor to selectively open and close the branch passage,
The cooling and heating system for a vehicle, characterized in that the first on-off valve is a 3-way valve and the second on-off valve is a 2-way valve.
The method of claim 2,
The sensor unit,
A high-pressure PT sensor provided on the first flow path and measuring the temperature and pressure of the refrigerant moving from the compressor to the first heat exchanger;
an intermediate pressure PT sensor provided on the branch flow path to measure the temperature and pressure of the gaseous refrigerant moving from the gas-liquid separator to the compressor;
a low pressure PT sensor provided on the sixth flow path to measure the temperature and pressure of the refrigerant moving from the fourth heat exchanger to the compressor;
A cooling and heating system for a vehicle comprising an outside air temperature sensor provided adjacent to the third heat exchanger to measure the temperature of the outside air.
The method of claim 2,
In the cooling mode, the first on-off valve of the on-off valve part provided on the fourth flow path is opened in the direction of the third heat exchanger, and the second on-off valve of the on-off valve part provided on the branch flow path is closed,
The first electronic expansion valve of the expansion valve part provided on the second flow path and the second electronic expansion valve of the expansion valve part provided on the third flow path are fully opened, and the fourth heat exchanger is provided on the fifth flow path. The cooling and heating system for a vehicle, characterized in that the solenoid expansion valve of the expansion valve part provided at the front end of the expansion valve expands the refrigerant supplied to the fourth heat exchanger while being opened.
The method of claim 2,
In the heating mode, the first on-off valve of the on-off valve part provided on the fourth flow path is opened in the direction of the bypass flow path, and the second on-off valve of the on-off valve part provided on the branch flow path is closed,
The first electronic expansion valve of the expansion valve part provided on the second flow path is completely opened, and the second electronic expansion valve of the expansion valve part provided on the third flow path is opened while refrigerant supplied to the second heat exchanger is released. An air-conditioning system for a vehicle, characterized in that it expands.
The method of claim 2,
In the gas injection heating mode, the first on-off valve of the on-off valve part provided on the fourth flow path is opened in the direction of the bypass flow path, and the second on-off valve of the on-off valve part provided on the branch flow path is opened. ,
The second electronic expansion valve of the expansion valve part provided on the third flow path is fully opened, and the first electronic expansion valve of the expansion valve part provided on the second flow path is opened to expand the refrigerant supplied to the gas-liquid separator. A cooling and heating system for a vehicle, characterized in that for doing.

Images