KR20220160190A - Automotive air conditioning system - Google Patents

Abstract

The present invention provides an automotive air conditioning system. The automotive air conditioning system comprises: a compressor which compresses an introduced refrigerant and discharges the compressed refrigerant in a high-temperature and high-pressure gaseous state; a first heat exchanger which is connected to the compressor via a first flow passage, in which the high-temperature and high-pressure refrigerant discharged from the compressor is introduced, and which exchanges heat between the introduced refrigerant and air flowing inside an air conditioning case to heat the interior in a heating mode; a second heat exchanger which is connected to the first heat exchanger via a second flow passage, in which the refrigerant discharged from the first heat exchanger is introduced, and which condenses the refrigerant through heat exchange with cooling water; a third heat exchanger which is connected to the second heat exchanger via a third flow passage, in which the refrigerant discharged from the second heat exchanger is introduced, and which condenses the refrigerant through heat exchange with external air; a fourth heat exchanger which is connected to the third heat exchanger via a fourth flow passage and to the compressor via a fifth flow passage, in which the refrigerant discharged from the third heat exchanger is introduced, and which cools down the interior of a vehicle by vaporizing the refrigerant through heat exchange with the air supplied to the interior of the vehicle through the air conditioning case; an expansion valve unit which is provided on the second and fourth flow passages to expand and depressurize the refrigerant moving via the second and fourth flow passages; an opening/closing valve which is provided at a point where a bypass flow passage connected to the fifth flow path diverges on a branching point branched from the third flow passage and connected to the fourth flow passage; and a control unit which is connected to the expansion valve unit and the opening/closing valve and controls the operation of the expansion valve unit and an opening/closing direction of the opening/closing valve in response to each mode. The present invention aims to provide an automotive air conditioning system that utilizes a single 3-way valve, which can form a bi-directional flow, to carry out both the heating and cooling, thereby enabling component optimization and packaging efficiency.

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 by using a refrigerant heat-exchanged with cooling water in a second heat exchanger.

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 the refrigerant flowing inside the evaporator to exchange air passing through the outside of the evaporator with the refrigerant flowing inside the evaporator to cool the interior of the vehicle. The air is heated by exchanging heat with the coolant flowing inside the heater core to convert the air into warm air, thereby heating the interior of the vehicle.

On the other hand, different from the above-mentioned vehicle air conditioner, a heat pump system capable of selectively performing cooling and heating by changing the flow direction of the refrigerant using one refrigerant cycle is applied. For example, two heat exchangers and , It is provided with a directional control valve, which is a three-way valve that can switch the flow direction of the refrigerant. Therefore, cooling and heating are possible according to 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, when using the existing 3-way directional control valve, the directional control valve can only selectively switch modes, and when using multiple 2-way valves, if bi-directional refrigerant branching is required, each 2-way valve needs a refrigerant distribution function. Due to the problem of increasing the number of parts and the need to install a plurality of 2-way valves, disadvantages occurred in mountability.

The present invention was created to solve the above problems, and it is possible to implement a heating and cooling mode by using one 3-way valve, which is an on-off valve, so that bi-directional flow can be formed when necessary, thereby improving the optimization and packaging of parts. Its purpose is to provide a cooling and heating system for a vehicle.

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, in which the high-temperature and high-pressure refrigerant discharged from the compressor flows in and exchanges heat with the air flowing in the air conditioning case to heat the room in a heating mode; a second heat exchanger connected to the first heat exchanger by a second flow path and condensing the refrigerant through heat exchange with cooling water by introducing the refrigerant discharged from the first heat exchanger; a third heat exchanger connected to the second heat exchanger by a third flow path and condensing the refrigerant through heat exchange with external air by taking in the refrigerant discharged from the second heat exchanger; Connected to the third heat exchanger by a fourth flow path, connected to the compressor by a fifth 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 through heat exchange; an expansion valve unit provided on the second and fourth flow passages to expand and depressurize the refrigerant moving to the second and fourth flow passages; an on-off valve provided at a point where a bypass flow path connected to the fifth flow path diverges on a branch flow path branched from the third flow path and connected to the fourth flow path; and a control unit connected to the expansion valve unit and the opening/closing valve and controlling an operation of the expansion valve unit and an opening/closing direction of the opening/closing valve corresponding to each mode.

In the cooling and heating system for a vehicle according to the present invention, the expansion valve unit is provided at the front end of the second heat exchanger on the second flow path, and in the first heating mode, the second heating mode, the third heating mode, and the heating and dehumidifying mode. An electronic expansion valve that expands and decompresses the refrigerant supplied from the first heat exchanger to the second heat exchanger, and is provided at a front end of the fourth heat exchanger on the fourth flow path and in a cooling mode through the fourth flow path. A solenoid expansion valve for expanding and reducing the refrigerant supplied to the heat exchanger may be included.

A 3-way valve may be used as the opening/closing valve, and a ball provided inside the opening/closing valve may have a discharge port connected to the compressor side, and first to fourth inlet ports communicating with the discharge port may be formed. When the ball is rotated around the discharge port, when the first inlet, the second inlet, the third inlet, and the fourth inlet are not all open or are open, one or more may be opened.

The second inlet and the third inlet may be disposed perpendicular to the discharge port, the first inlet and the third inlet may be positioned corresponding to the discharge port, and the fourth inlet may be positioned to correspond to the discharge port. Between the first inlet and the third inlet, it may be spaced apart from the first inlet and within a range of 40° to 50°.

The first inlet and the fourth inlet may have the same diameter, the second inlet and the third inlet may have the same diameter, and the first inlet and the fourth inlet may have the same diameter as the second inlet and the third inlet. It may have a smaller diameter than the third inlet.

In the cooling mode, the discharge port of the on-off valve provided at the point where the bypass flow path diverges on the branch flow path can be opened toward the compressor, the first to fourth inlet ports of the on-off valve can be closed, and the second flow path The electronic expansion valve of the expansion valve part provided on the upper part can be opened, and the solenoid expansion valve of the expansion valve part provided on the fourth flow path can expand the refrigerant supplied to the fourth heat exchanger through the fourth flow path. have.

In the first heating mode, an outlet of an on-off valve provided at a branching point of the bypass flow path on the branch flow path may be opened toward the compressor, and the first inlet and the third inlet of the on-off valve unit may be connected to the second heat exchanger, respectively. It can be opened to the third heat exchanger, the second inlet and the fourth inlet can be closed, and the electronic expansion valve of the expansion valve unit provided on the second flow path can expand the refrigerant moving to the second flow path, , The solenoid expansion valve of the expansion valve unit provided on the fourth flow path may be closed so that the refrigerant does not move to the fourth flow path.

In the second heating mode, the outlet of the on-off valve provided at the point where the bypass flow path diverges on the branch flow path can be opened to the compressor, and the second inlet of the on-off valve unit can be opened to the second heat exchanger. , The first inlet, the third inlet, and the fourth inlet can be closed, and the electronic expansion valve of the expansion valve part provided on the second flow path can expand the refrigerant moving to the second flow path, and the fourth flow path The solenoid expansion valve of the expansion valve part provided on the upper part may be closed so that the refrigerant does not move to the fourth passage.

In the third heating mode, the outlet of the on-off valve provided at the point where the bypass flow path diverges on the branch flow path can be opened to the compressor, and the second inlet of the on-off valve unit can be opened to the third heat exchanger. , The first inlet, the third inlet, and the fourth inlet can be closed, and the electronic expansion valve of the expansion valve part provided on the second flow path can expand the refrigerant moving to the second flow path, and the fourth flow path The solenoid expansion valve of the expansion valve part provided on the upper part may be closed so that the refrigerant does not move to the fourth passage.

In the heating and dehumidifying mode, the outlet of the on-off valve provided at the point where the bypass flow path diverges on the branch flow path can be opened to the compressor, and the fourth inlet of the on-off valve unit can be opened to the second heat exchanger, The first inlet, the second inlet, and the third inlet may be closed, and the electronic expansion valve of the expansion valve part provided on the second flow path may expand the refrigerant moving to the second flow path, and the fourth flow path may be closed. The solenoid expansion valve of the expansion valve part provided in is opened to supply the refrigerant moving to the fourth flow path to the fourth heat exchanger.

In the cooling and heating system for a vehicle according to the present invention, it is possible to implement a cooling and heating mode by switching the flow of refrigerant using one on-off valve, which is a three-way valve, and optimize parts by enabling bi-directional flow of refrigerant when necessary using an on-off valve. And it is possible to improve the packaging property, it is possible to improve the mountability of the on-off valve by mounting only one on-off valve.

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 flow chart of refrigerant circulation in the cooling and heating system for a vehicle shown in FIG. 1 , opening/closing states of opening/closing valves, and a flow state of refrigerant through the opening/closing valves.
FIG. 3 is a diagram illustrating a flow chart of refrigerant circulation in the first heating mode of the heating and cooling system for a vehicle shown in FIG. 1, opening/closing states of opening/closing valves, and a flow state of refrigerant through the opening/closing valves.
FIG. 4 is a diagram illustrating a flow chart of refrigerant circulation in the second heating mode of the vehicle cooling and heating system shown in FIG.
FIG. 5 is a flowchart illustrating circulation of a refrigerant in a third heating mode of the cooling and heating system for a vehicle shown in FIG. 1, an open/closed state of an on/off valve, and a flow state of the refrigerant through the on/off valve.
FIG. 6 is a diagram showing a flow of refrigerant circulation in the heating and dehumidifying mode of the cooling and heating system for a vehicle shown in FIG.

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 6, a vehicle cooling and heating system 10 according to an embodiment of the present invention includes a compressor 100, a first heat exchanger 200, a second heat exchanger 300, and a third heat exchanger. It includes a group 400, a fourth heat exchanger 500, an expansion valve unit 600, an on-off valve 700, and a control unit 800.

Referring to FIG. 1 , a vehicle cooling and heating system 10 according to an embodiment of the present invention includes a compressor 100, a first heat exchanger 200, a second heat exchanger 300, and a second heat exchanger 300 on a refrigerant circulation line in which a refrigerant circulates The third heat exchanger 400 and the fourth heat exchanger 500 are connected, and is preferably applied to an electric vehicle or a hybrid vehicle.

The compressor 100 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 100 is connected to the first flow path R1, and the input end of the first heat exchanger 200 and the output end of the compressor 100 are connected through the first flow path R1, so that the compressor The high-temperature and high-pressure refrigerant (gas) compressed in (100) is output to the first heat exchanger (200).

The first heat exchanger 200 is provided in an air conditioning case (not shown), and the first heat exchanger 200 transfers the high-temperature and high-pressure refrigerant (gas) discharged from the compressor 100 to the first flow path R1. enter through The first heat exchanger 200 condenses the high-temperature and high-pressure refrigerant (gas) supplied to the inside through heat exchange with air supplied to the interior of the vehicle through an air conditioning case (not shown), and heats the air with the condensed heat, Heating of the vehicle interior is provided. It is preferable that an indoor condenser provided inside an air conditioning case (not shown) is used as the first heat exchanger 200, and an indoor condenser provided inside the air conditioning case (not shown) is adjacent to the first heat exchanger 200. 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 200 is connected to the second flow path R2, and the second flow path R2 is connected to the second heat exchanger 300. The second heat exchanger 300 takes in the refrigerant discharged from the first heat exchanger 200 through the second flow path R2 and condenses the refrigerant through heat exchange with the cooling water flowing in a cooling water line (not shown). And it serves to evaporate, and an electronic expansion valve 610 of an expansion valve unit 600 to be described later is provided on the second flow path R2, and a water-cooled condenser is preferably used as the second heat exchanger 300. do.

The second heat exchanger 300 is connected to the third heat exchanger 400 by a third flow path R3. The third heat exchanger 400 receives the refrigerant introduced through the third flow path R3. The refrigerant is condensed by heat exchange with external air and then discharged to the fourth flow path R4 through the output stage. The fourth flow path R4 is connected to the fourth heat exchanger 500 and supplies the refrigerant that is output after being condensed in the third heat exchanger 400 to the fourth heat exchanger 500 .

The third heat exchanger 400 draws in the refrigerant from the second heat exchanger 300 and condenses the refrigerant through heat exchange with outside air. ), it is disposed close to the radiator unit (not shown) provided, the refrigerant introduced through the input side is condensed by heat exchange with the outside air, and then discharged to the fourth flow path R4, and the third heat exchanger 400 Outdoor capacitors are preferably used.

The fourth flow path R4 is connected to the fourth heat exchanger 500 to supply the refrigerant that is output after being condensed in the third heat exchanger 400 to the fourth heat exchanger 500. The unit 500 serves to cool the interior of the vehicle by evaporating the introduced refrigerant and exchanging heat with air supplied to the interior of the vehicle through an air conditioning case (not shown), and an evaporator is used as the fourth heat exchanger 500. it is desirable to be The fourth heat exchanger 500 is connected to the compressor 100 by a fifth flow path R5, and the refrigerant supplied from the fourth heat exchanger 500 and the third flow path are connected to the fifth flow path R5. The refrigerant supplied from the bypass passage BR branched from R3 and connected to the fourth passage R4 and branched from the branch passage QR connected to the fifth passage R5 is temporarily stored and introduced. It is preferable that an accumulator (not shown) is provided to separate the refrigerant into liquid refrigerant and gaseous refrigerant and supply the separated gaseous refrigerant to the compressor 100 .

A heater rod (not shown) made of a carbon heating composite material for vaporizing the supplied liquid refrigerant may be provided inside the accumulator (not shown), and a heater rod (not shown) is installed inside the accumulator (not shown). As provided, it is possible to increase the degree of superheat of the refrigerant supplied to the compressor 100, thereby improving heating efficiency.

An expansion valve 600 is provided on the second flow path R2 and the fourth flow path R4, and the expansion valve unit 600 selectively operates the second flow path R2 and the fourth flow path R4. While opening and closing, it serves to expand and depressurize the refrigerant moving to the second and fourth flow passages R2 and R4. The expansion valve unit 600 includes an electronic expansion valve 610 and a solenoid expansion valve 620, and the electronic expansion valve 610 is provided on the second flow path R2 to provide a first heating mode, In the second heating mode, the third heating mode, and the heating and dehumidifying mode, the refrigerant passing through the first heat exchanger 200 and moving to the second flow path R2 is expanded and reduced in pressure.

The solenoid expansion valve 620 is provided on the fourth flow path R4 adjacent to the fourth heat exchanger 500 and passes through the third heat exchanger 400 in the cooling mode to reach the fourth heat exchanger 500. It expands and decompresses the refrigerant supplied to the refrigerant.

An on-off valve ( 700) is provided, and the opening/closing valve 700 switches the flow of the refrigerant moving to the third flow path R3 and the third flow path R4 and moves it to the branch flow path QR or to the branch flow path It serves to convert the flow of refrigerant moving to (QR) and move it to the bypass passage (BR).

The on-off valve 700 is preferably a 3-way valve having a ball with a passage processed therein. Since the on-off valve 700 uses a 3-way valve with a built-in ball formed therein, the incoming refrigerant can be discharged in both directions at the same time, and the refrigerant can flow simultaneously according to the differential pressure of each refrigerant circuit by the control unit 800 described below. Preferably, the opening is controlled so that

2 to 6, the ball 710 provided inside the on-off valve 700 includes a first inlet 711, a second inlet 712, a third inlet 713, and a fourth inlet ( 714), an outlet 715 is formed, and the first inlet 711, the second inlet 712, the third inlet 713, the fourth inlet 714, and the outlet 715 are preferably in communication with each other. do.

The first inlet 711 is connected to the second heat exchanger 300 in the first heating mode, and the third inlet 713 is connected to the third heat exchanger 400 in the first heating mode. The refrigerant introduced into the opening/closing valve 700 through the first inlet 711 and the third inlet 713 enters the compressor 100 through the outlet 715 and the bypass passage BR. supplied to the side.

The second inlet 712 is connected to the second heat exchanger 300 in the second heating mode, and the refrigerant introduced into the opening/closing valve 700 through the second inlet 712 in the second heating mode. is supplied to the compressor 100 through the discharge port 715 and the bypass passage BR.

The fourth inlet 714 is connected to the second heat exchanger 300 in the heating and dehumidifying mode, and the refrigerant introduced into the opening/closing valve 700 through the fourth inlet 714 in the heating and dehumidifying mode It is supplied to the compressor 100 through the discharge port 715 and the bypass passage BR, and when the ball 710 rotates around the discharge port 715, the first inlet 711 and the second inlet ( 712), the third inlet 713, and the fourth inlet 714 are not all open, or if they are open, at least one is preferably opened.

The second inlet 712 and the third inlet 713 are preferably disposed perpendicular to the outlet 715, and the first inlet 711 and the third inlet 713 are the outlet. It is located correspondingly with 715 as the center. The fourth inlet 714 is preferably positioned to be spaced apart from the first inlet 711 within a range of 40 ° to 50 ° between the first inlet 711 and the third inlet 713. When the ball 710 rotates around the outlet 715, the first inlet 711, the second inlet 712, the third inlet 713, and the fourth inlet 714 either do not open or are open. In this case, more than one will be open.

The first inlet 711 and the fourth inlet 714 have the same diameter, the second inlet 712 and the third inlet 713 have the same diameter, and the first inlet 711 and The fourth inlet 714 preferably has a smaller diameter than the second inlet 712 and the third inlet 713 .

Referring to FIG. 1 , the expansion valve unit 600 and the opening/closing valve 700 are connected to a control unit 800, and the control unit 800 operates the expansion valve unit 600 in response to each mode. , It serves to control the opening and closing direction of the opening and closing valve 700. The control unit 800 is preferably connected to a sensor unit (not shown), and the sensor unit (not shown) is disposed adjacent to the third heat exchanger 400 to measure the temperature of the outside air, and the compressor ( 100) measures the degree of superheat of the refrigerant supplied and transmits it to the control unit 800, the control unit 800 controls the expansion valve unit 600 and the Control the on-off valve 700 to switch to each mode.

Referring to FIG. 2, the flow of refrigerant in the cooling mode is a compressor 100, a first heat exchanger 200, a second heat exchanger 300, a third heat exchanger 400, a fourth heat exchanger 500, While circulating through the compressor 100, cooling of the interior of the vehicle is performed.

The opening and closing provided at the branching point of the bypass passage BR connected to the fifth passage R5 on the branch passage QR branched from the third passage R3 and connected to the fourth passage R4. The first inlet 711, the second inlet 712, the third inlet 713, and the fourth inlet 714 of the valve 700 are all closed so that the third flow path R3 and the fourth flow path R4 The refrigerant moved to is not moved to the branch passage QR.

The electronic expansion valve 610 provided on the second flow path R2 is open and supplies the refrigerant moving to the second flow path R2 to the second heat exchanger 300, and provided on the fourth flow path The solenoid expansion valve 620 expands the refrigerant moving to the fourth flow path R4 and then supplies the refrigerant to the fourth heat exchanger 500 . The refrigerant passing through the fourth heat exchanger 500 is separated into liquid refrigerant and gaseous refrigerant while passing through an accumulator (not shown), and the separated gaseous refrigerant is circulated to the compressor 100 .

Referring to FIG. 3, in the first heating mode, the flow of refrigerant passes through the compressor 100, the first heat exchanger 200, and the second heat exchanger 300, and then some of the refrigerant passes through the branch passage QR and bypasses. Some of the refrigerant that circulates to the compressor 100 through the flow path BR and passes through the second heat exchanger 300 passes through the third heat exchanger 400, then the branch flow path QR and the bypass flow path BR. ), while circulating to the compressor 100, heating the vehicle interior is performed.

The opening and closing provided at the branching point of the bypass passage BR connected to the fifth passage R5 on the branch passage QR branched from the third passage R3 and connected to the fourth passage R4. The first inlet 711 of the valve 700 is opened to the second heat exchanger 300 and the third inlet 713 is opened to the third heat exchanger 400, so that the first inlet 711 and the third inlet 711 are opened. The refrigerant introduced through the inlet 713 is supplied to the compressor 100 through the bypass passage BR.

The electronic expansion valve 610 provided on the second flow path R2 is open and supplies the refrigerant moving to the second flow path R2 to the second heat exchanger 300, and provided on the fourth flow path The solenoid expansion valve 620 is closed so that the refrigerant discharged from the third heat exchanger 400 is not supplied to the fourth heat exchanger 500 .

The electronic expansion valve 610 provided on the second flow path R2 is opened and the refrigerant moving to the second flow path R2 is expanded and then supplied to the second heat exchanger 300, and the second heat exchanger Some of the refrigerant that has passed through 300 is supplied to an accumulator (not shown) located at the front of the compressor 100 through the branch flow path QR and the bypass flow path BR, and the second heat exchanger 300 Some of the coarse refrigerant passes through the third heat exchanger 400 and then is supplied to an accumulator (not shown) through a branch passage (QR) and a bypass passage (BR). It is separated into refrigerant, and the separated gaseous refrigerant is circulated to the compressor (100).

Referring to FIG. 4, in the second heating mode, the refrigerant flows through the compressor 100, the first heat exchanger 200, the second heat exchanger 300, the branch passage QR and the bypass passage BR. While circulating through the compressor 100, the interior of the vehicle is heated.

The opening and closing provided at the branching point of the bypass passage BR connected to the fifth passage R5 on the branch passage QR branched from the third passage R3 and connected to the fourth passage R4. The second inlet 712 of the valve 700 is opened toward the second heat exchanger 300, and the first inlet 711, the third inlet 713, and the fourth inlet 714 are closed, The refrigerant introduced through the second inlet 712 is discharged through the outlet 715 to the bypass passage BR, and is supplied to the compressor 100 after passing through the bypass passage BR.

The electronic expansion valve 610 provided on the second flow path R2 is open and supplies the refrigerant moving to the second flow path R2 to the second heat exchanger 300, and provided on the fourth flow path The solenoid expansion valve 620 is closed and the refrigerant discharged from the second heat exchanger 300 is preferably supplied to the compressor 100 through the branch passage QR and the bypass passage BR.

The electronic expansion valve 610 provided on the second flow path R2 is opened and the refrigerant moving to the second flow path R2 is expanded and then supplied to the second heat exchanger 300, and the second heat exchanger The refrigerant that has passed through 300 is supplied to an accumulator (not shown) located at the front end of the compressor 100 through a branch passage (QR) and a bypass passage (BR), and the liquid refrigerant and gas phase in the accumulator (not shown) After being separated into refrigerant, the separated gaseous refrigerant is circulated to the compressor (100).

Referring to FIG. 5, in the third heating mode, the flow of refrigerant flows through the compressor 100, the first heat exchanger 200, the second heat exchanger 300, the third heat exchanger 400, and the branch passage QR. Heating of the vehicle interior is performed while circulating to the compressor 100 through the bypass flow path BR.

The opening and closing provided at the branching point of the bypass passage BR connected to the fifth passage R5 on the branch passage QR branched from the third passage R3 and connected to the fourth passage R4. The second inlet 712 of the valve 700 is open to the third heat exchanger 400, and the first inlet 711, the third inlet 713, and the fourth inlet 714 are closed, The refrigerant introduced through the second inlet 712 is discharged through the outlet 715 to the bypass passage BR, and is supplied to the compressor 100 after passing through the bypass passage BR.

The electronic expansion valve 610 provided on the second flow path R2 is open and supplies the refrigerant moving to the second flow path R2 to the second heat exchanger 300, and provided on the fourth flow path The solenoid expansion valve 620 is closed so that the refrigerant discharged from the third heat exchanger 400 is not supplied to the fourth heat exchanger 500 .

The electronic expansion valve 610 provided on the second flow path R2 is opened and the refrigerant moving to the second flow path R2 is expanded and then supplied to the second heat exchanger 300, and the second heat exchanger The refrigerant that has passed through 300 is supplied to the third heat exchanger 400, and the refrigerant that has passed through the third heat exchanger 400 is supplied to the compressor 100 through a branch passage QR and a bypass passage BR. It is supplied to an accumulator (not shown) located at the front end, and after being separated into a liquid refrigerant and a gaseous refrigerant in the accumulator (not shown), the separated gaseous refrigerant is circulated to the compressor 100 .

Referring to FIG. 6, in the heating and dehumidifying mode, the flow of refrigerant passes through the compressor 100, the first heat exchanger 200, and the second heat exchanger 300, and then part of the refrigerant flows through the third heat exchanger 400 and the second heat exchanger 400. 4 Circulates through the heat exchanger 500 and the compressor 100, and the other part of the refrigerant that has passed through the second heat exchanger 300 circulates through the branch flow path QR and the bypass flow path BR to the compressor 100. While heating and dehumidifying the interior of the vehicle.

The opening and closing provided at the branching point of the bypass passage BR connected to the fifth passage R5 on the branch passage QR branched from the third passage R3 and connected to the fourth passage R4. The fourth inlet 714 of the valve 700 is opened toward the second heat exchanger 300, and the first inlet 711, the second inlet 712, and the third inlet 713 are closed, 4 The refrigerant introduced through the inlet 714 is discharged through the discharge port 715 to the bypass passage BR, and is supplied to the compressor 100 after passing through the bypass passage BR. The compressor after passing through the third heat exchanger 400 and the fourth heat exchanger 500 exceeds the amount of refrigerant supplied to the compressor 100 through the branch passage QR and the bypass passage BR. It is preferable that the amount of refrigerant supplied to the (100) side is small.

The electronic expansion valve 610 provided on the second flow path R2 is open and supplies the refrigerant moving to the second flow path R2 to the second heat exchanger 300, and provided on the fourth flow path The solenoid expansion valve 620 is also opened so that the refrigerant discharged from the third heat exchanger 400 is supplied to the fourth heat exchanger 500.

The electronic expansion valve 610 provided on the second flow path R2 is opened and the refrigerant moving to the second flow path R2 is expanded and then supplied to the second heat exchanger 300, and the second heat exchanger The refrigerant that has passed through 300 is supplied to an accumulator (not shown) located at a front end of the compressor 100 through the branch passage QR and the bypass passage BR. The refrigerant that has passed through the third heat exchanger 400 and the fourth heat exchanger 500 is also supplied to the accumulator (not shown). Refrigerant is circulated to the compressor (100).

Therefore, it is possible to implement a cooling/heating mode by switching the flow of refrigerant using one on-off valve 700, which is a three-way valve, and optimize parts by enabling bi-directional flow of refrigerant when necessary using the on-off valve 700. And packaging properties can be improved, and mounting of the on-off valve 700 can be improved by mounting only one on-off valve 700 .

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.

10: vehicle heating and cooling system 100: compressor
200: first heat exchanger 300: second heat exchanger
400: third heat exchanger 500: fourth heat exchanger
600: expansion valve unit 610: electronic expansion valve
620: solenoid expansion valve 700: on-off valve
800: control unit

Claims (10)

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, in which the high-temperature and high-pressure refrigerant discharged from the compressor flows in and exchanges heat with the air flowing in the air conditioning case to heat the room in a heating mode;
a second heat exchanger connected to the first heat exchanger by a second flow path and condensing the refrigerant through heat exchange with cooling water by introducing the refrigerant discharged from the first heat exchanger;
a third heat exchanger connected to the second heat exchanger by a third flow path and condensing the refrigerant through heat exchange with external air by taking in the refrigerant discharged from the second heat exchanger;
Connected to the third heat exchanger by a fourth flow path, connected to the compressor by a fifth 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 through heat exchange;
an expansion valve unit provided on the second and fourth flow passages to expand and depressurize the refrigerant moving into the second and fourth flow passages;
an on-off valve provided at a point where a bypass flow path connected to the fifth flow path diverges on a branch flow path branched from the third flow path and connected to the fourth flow path; and
and a control unit connected to the expansion valve unit and the opening/closing valve and controlling an operation of the expansion valve unit and an opening/closing direction of the opening/closing valve corresponding to each mode.
The method of claim 1,
The expansion valve part,
It is provided at the front end of the second heat exchanger on the second flow path and supplies the refrigerant from the first heat exchanger to the second heat exchanger in the first heating mode, the second heating mode, the third heating mode, and the heating and dehumidifying mode. An electronic expansion valve for expanding and reducing pressure;
and a solenoid expansion valve disposed in front of the fourth heat exchanger on the fourth flow path and expanding and reducing the refrigerant supplied to the fourth heat exchanger through the fourth flow path in a cooling mode.
The method of claim 1,
The on-off valve uses a 3-way valve,
A discharge port connected to the compressor side and a first to fourth inlet port communicating with the discharge port are formed in the ball provided inside the on-off valve,
When the ball is rotated around the discharge port, the first inlet, the second inlet, the third inlet, and the fourth inlet are not all opened, or if all are opened, at least one is opened.
The method of claim 3,
The second inlet and the third inlet are disposed perpendicular to the discharge port, the first inlet and the third inlet are positioned to correspond to the discharge port, and the fourth inlet is positioned to correspond to the first inlet and the discharge port. The cooling and heating system for a vehicle, characterized in that located spaced apart from the first inlet and within the range of 40 ° to 50 ° between the third inlet.
The method of claim 4,
The first inlet and the fourth inlet have the same diameter, the second inlet and the third inlet have the same diameter, and the first inlet and the fourth inlet are smaller than the second inlet and the third inlet. A cooling and heating system for a vehicle, characterized in that it has a small diameter.
The method of claim 5,
In the cooling mode, the discharge port of the on-off valve provided at the point where the bypass flow path diverges on the branch flow path is opened toward the compressor, and the first to fourth inlet ports of the on-off valve are closed.
The electronic expansion valve of the expansion valve part provided on the second flow path opens, and the solenoid expansion valve of the expansion valve part provided on the fourth flow path expands the refrigerant supplied to the fourth heat exchanger through the fourth flow path. A cooling and heating system for a vehicle, characterized in that for doing.
The method of claim 5,
In the first heating mode, the discharge port of the on-off valve provided at the point where the bypass flow path diverges on the branch flow path is opened toward the compressor, and the first inlet and the third inlet of the on-off valve unit are respectively connected to the second heat exchanger and the third inlet. Open to the heat exchanger side, the second inlet and the fourth inlet are closed,
The electronic expansion valve of the expansion valve part provided on the second flow path expands the refrigerant moving to the second flow path, and the solenoid expansion valve of the expansion valve part provided on the fourth flow path is closed to supply the refrigerant to the fourth flow path. A cooling and heating system for a vehicle, characterized in that it does not move.
The method of claim 5,
In the second heating mode, the discharge port of the on-off valve provided at the point where the bypass flow path diverges on the branch flow path is opened to the compressor, the second inlet of the on-off valve unit is opened to the second heat exchanger, and the first inlet And the third inlet and the fourth inlet are closed,
The electronic expansion valve of the expansion valve part provided on the second flow path expands the refrigerant moving to the second flow path, and the solenoid expansion valve of the expansion valve part provided on the fourth flow path is closed to supply the refrigerant to the fourth flow path. A cooling and heating system for a vehicle, characterized in that it does not move.
The method of claim 5,
In the third heating mode, the discharge port of the on-off valve provided at the point where the bypass flow path diverges on the branch flow path is opened to the compressor, the second inlet of the on-off valve part is opened to the third heat exchanger, and the first inlet And the third inlet and the fourth inlet are closed,
The electronic expansion valve of the expansion valve part provided on the second flow path expands the refrigerant moving to the second flow path, and the solenoid expansion valve of the expansion valve part provided on the fourth flow path is closed to supply the refrigerant to the fourth flow path. A cooling and heating system for a vehicle, characterized in that it does not move.
The method of claim 5,
In the heating and dehumidifying mode, the outlet of the on-off valve provided at the point where the bypass flow path diverges on the branch flow path is opened to the compressor, the fourth inlet of the on-off valve part is opened to the second heat exchanger, and the first inlet and The second inlet and the third inlet are closed,
The electronic expansion valve of the expansion valve unit provided on the second flow path expands the refrigerant moving to the second flow path, and the solenoid expansion valve of the expansion valve unit provided on the fourth flow path is opened and moved to the fourth flow path. Cooling and heating system for a vehicle, characterized in that for supplying the refrigerant to the fourth heat exchanger.

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