KR-102962806-B1 - Automotive heat pump system

KR102962806B1KR 102962806 B1KR102962806 B1KR 102962806B1KR-102962806-B1

Abstract

The present invention comprises: a compressor that compresses an incoming refrigerant and discharges it in a gaseous state; an indoor condenser connected to the compressor by a first flow path, into which high-temperature, high-pressure refrigerant discharged from the compressor is introduced, and which heats the vehicle interior during a heating mode by exchanging heat between the incoming refrigerant and air flowing within an air conditioning case; an outdoor heat exchanger connected to the indoor condenser by a second flow path, which draws in the refrigerant discharged from the indoor condenser and condenses the refrigerant by exchanging heat with air supplied from the outside; and an evaporator connected to the outdoor heat exchanger by a third flow path, which cools the interior by exchanging heat with air supplied to the vehicle interior while vaporizing the refrigerant during a cooling mode, battery cooling mode, or heating/dehumidification mode, and supplies the heat-exchanged refrigerant to the compressor through a fourth flow path. An integrated chiller provided on a fifth path that branches off from the third path and connects to the fourth path, receiving refrigerant discharged from the outdoor heat exchanger during battery cooling mode, heating mode, and heating dehumidification mode, and refrigerant discharged from the indoor condenser during heating defrosting mode, exchanging heat with battery cooling water, and supplying the heat-exchanged refrigerant to the compressor; an expansion valve section provided on the second path, on the third path, upstream of the evaporator, and on the fifth path, upstream of the integrated chiller, which selectively opens and closes the second path, the third path, and the fifth path, and selectively expands the refrigerant moving to the second path, the third path, and the fifth path; and an opening/closing valve provided on a sixth path that branches off from the second path adjacent to the outdoor heat exchanger and connects to the fifth path at the upstream of the integrated chiller, which selectively opens and closes the sixth path. A vehicle heat pump system is provided, comprising a control unit that controls the operation of the expansion valve unit and the opening/closing valve in response to each mode. Therefore, it is possible to implement battery cooling and heating modes without adding a separate battery chiller and expansion valve, simultaneously absorb heat from an external heat source and a cooling water waste heat source, and improve heating performance by allowing selective heat absorption depending on the heat source condition.

Inventors

김철민
이강종

Assignees

주식회사 두원공조

Dates

Publication Date: 20260512
Application Date: 20201119

Claims (16)

A compressor that compresses the incoming refrigerant and discharges it in a gaseous state; An interior condenser connected to the above compressor by a first flow path, into which high-temperature, high-pressure refrigerant discharged from the compressor flows, and which heats the vehicle interior in heating mode by exchanging heat between the incoming refrigerant and the air flowing inside the air conditioning case; An outdoor heat exchanger connected to the indoor condenser by the second Euro, which draws in the refrigerant discharged from the indoor condenser and condenses the refrigerant through heat exchange with air supplied from the outside; An evaporator connected to the above outdoor heat exchanger by a third path, and in cooling mode, battery cooling mode, and heating/dehumidification mode, receiving refrigerant discharged from the above outdoor heat exchanger, vaporizing the refrigerant, and cooling the interior by heat exchange with the air supplied to the vehicle interior, and supplying the heat-exchanged refrigerant to the above compressor through a fourth path; An integrated chiller provided on a fifth euro that branches off from the third euro and connects to the fourth euro, which receives refrigerant discharged from the outdoor heat exchanger during battery cooling mode, heating mode, and heating dehumidification mode, and refrigerant discharged from the indoor condenser during heating defrosting mode, exchanges heat with battery cooling water, and supplies the heat-exchanged refrigerant to the compressor; An expansion valve section provided on the second and third flow paths, at the front end of the evaporator, and on the fifth flow path, at the front end of the integrated chiller, which selectively opens and closes the second, third, and fifth flow paths and selectively expands the refrigerant moving to the second, third, and fifth flow paths; An opening/closing valve provided on a sixth path that branches off from a second path adjacent to the outdoor heat exchanger and connects to the fifth path at the front end of the integrated chiller, thereby selectively opening and closing the sixth path; and It includes a control unit that controls the operation of the expansion valve unit and the opening/closing valve in correspondence with each mode, The above expansion valve section is, A first electronic expansion valve provided on the second Euro above, which expands and reduces pressure of the refrigerant passing through the indoor condenser during heating mode and heating/dehumidification mode, and A solenoid expansion valve provided at the front end of the evaporator on the third Euro above, which expands and reduces pressure of the refrigerant passing through the outdoor heat exchanger during cooling mode, battery cooling mode, and heating/dehumidification mode, and It includes a second electronic expansion valve provided at the front end of the integrated chiller on the fifth Euro above, which expands and reduces the pressure of the refrigerant passing through the outdoor heat vent during battery cooling mode, and A dehumidification path that branches off from the upstream end of the first electronic expansion valve on the second path and is connected to the solenoid expansion valve provided on the third path, and It further includes a dehumidification path opening/closing valve provided on the dehumidification path to selectively open and close the dehumidification path, and The above dehumidification path opening/closing valve is selectively opened/closed by the control unit, and A vehicle heat pump system characterized by the above dehumidification path being connected to the orifice hole of the above solenoid expansion valve.
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In claim 1, A vehicle heat pump system characterized by the use of a 2-way valve for the above-mentioned shut-off valve.
In claim 1, In cooling mode, The first electronic expansion valve provided on the second Euro is opened, and The second electronic expansion valve provided on the fifth euro and the opening/closing valve provided on the sixth euro are closed, and A vehicle heat pump system characterized by the solenoid expansion valve provided on the third Euro above expanding the refrigerant supplied to the evaporator.
In claim 1, In battery cooling mode, The first electronic expansion valve provided on the second Euro is opened, and the opening/closing valve provided on the sixth Euro is closed, and A vehicle heat pump system characterized in that the solenoid expansion valve provided on the third Euro expands the refrigerant supplied to the evaporator, and the second electronic expansion valve provided on the fifth Euro expands the refrigerant supplied to the integrated chiller.
In claim 1, In heating mode, The solenoid expansion valve provided on the third euro and the opening/closing valve provided on the sixth euro are closed, and The second electronic expansion valve provided on the above fifth Euro is opened, and A vehicle heat pump system characterized in that the first electronic expansion valve provided on the second Euro expands the refrigerant supplied from the indoor condenser to the outdoor heat exchanger.
A compressor that compresses the incoming refrigerant and discharges it in a gaseous state; An interior condenser connected to the above compressor by a first flow path, into which high-temperature, high-pressure refrigerant discharged from the compressor flows, and which heats the vehicle interior in heating mode by exchanging heat between the incoming refrigerant and the air flowing inside the air conditioning case; An outdoor heat exchanger connected to the indoor condenser by the second Euro, which draws in the refrigerant discharged from the indoor condenser and condenses the refrigerant through heat exchange with air supplied from the outside; An evaporator connected to the above outdoor heat exchanger by a third path, and in cooling mode, battery cooling mode, and heating/dehumidification mode, receiving refrigerant discharged from the above outdoor heat exchanger, vaporizing the refrigerant, and cooling the interior by heat exchange with the air supplied to the vehicle interior, and supplying the heat-exchanged refrigerant to the above compressor through a fourth path; An integrated chiller provided on a fifth euro that branches off from the third euro and connects to the fourth euro, which receives refrigerant discharged from the outdoor heat exchanger during battery cooling mode, heating mode, and heating dehumidification mode, and refrigerant discharged from the indoor condenser during heating defrosting mode, exchanges heat with battery cooling water, and supplies the heat-exchanged refrigerant to the compressor; An expansion valve section provided on the second and third flow paths, at the front end of the evaporator, and on the fifth flow path, at the front end of the integrated chiller, which selectively opens and closes the second, third, and fifth flow paths and selectively expands the refrigerant moving to the second, third, and fifth flow paths; An opening/closing valve provided on a sixth path that branches off from a second path adjacent to the outdoor heat exchanger and connects to the fifth path at the front end of the integrated chiller, thereby selectively opening and closing the sixth path; and It includes a control unit that controls the operation of the expansion valve unit and the opening/closing valve in correspondence with each mode, The above expansion valve section is, A first electronic expansion valve provided on the second Euro above, which expands and reduces pressure of the refrigerant passing through the indoor condenser during heating mode and heating/dehumidification mode, and A solenoid expansion valve provided at the front end of the evaporator on the third Euro above, which expands and reduces pressure of the refrigerant passing through the outdoor heat exchanger during cooling mode, battery cooling mode, and heating/dehumidification mode, and It includes a second electronic expansion valve provided at the front end of the integrated chiller on the fifth Euro above, which expands and reduces the pressure of the refrigerant passing through the outdoor heat vent during battery cooling mode, and In heating defrost mode, The solenoid expansion valve provided on the third Euro and the second electronic expansion valve provided on the fifth Euro are closed, and The above-mentioned shut-off valve provided on the above-mentioned sixth Euro is opened, and A vehicle heat pump system characterized in that the first electronic expansion valve provided on the second Euro expands the refrigerant supplied from the indoor condenser to the integrated chiller.
In claim 1, In heating/dehumidification mode, The opening and closing valve provided on the above-mentioned sixth Euro is closed, and The second electronic expansion valve provided on the above fifth Euro is opened, and A vehicle heat pump system characterized in that the first electronic expansion valve provided on the second path expands the refrigerant supplied from the indoor condenser to the outdoor heat exchanger, and the solenoid expansion valve provided on the third path expands the refrigerant supplied from the outdoor heat exchanger to the evaporator.
In claim 1, It further includes a direction control valve provided at the point where the sixth euro branch off from the second euro and switches the direction of movement of the refrigerant moving to the second euro, and A vehicle heat pump system characterized in that a 3-way valve is used as the directional control valve, and the opening and closing direction of the directional control valve is controlled by a control unit.
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In claim 1, In cooling mode, The first electronic expansion valve provided on the second Euro path is opened, and The second electronic expansion valve provided on the fifth path, the shut-off valve provided on the sixth path, and the dehumidification path shut-off valve provided on the dehumidification path are closed, and A vehicle heat pump system characterized by the solenoid expansion valve provided on the third Euro above expanding the refrigerant supplied to the evaporator.
In claim 1, In battery cooling mode, The first electronic expansion valve provided on the second Euro is opened, and The shut-off valve provided on the sixth Euro and the dehumidification path shut-off valve provided on the dehumidification path are closed, and A vehicle heat pump system characterized in that the solenoid expansion valve provided on the third Euro expands the refrigerant supplied to the evaporator, and the second electronic expansion valve provided on the fifth Euro expands the refrigerant supplied to the integrated chiller.
In claim 1, In heating mode, The solenoid expansion valve provided on the third path, the opening/closing valve provided on the sixth path, and the dehumidification path opening/closing valve provided on the dehumidification path are closed, and The second electronic expansion valve provided on the above fifth Euro is opened, and A vehicle heat pump system characterized in that the first electronic expansion valve provided on the second Euro expands the refrigerant supplied from the indoor condenser to the outdoor heat exchanger.
In claim 1, In heating defrost mode, The solenoid expansion valve provided on the third Euro, the second electronic expansion valve provided on the fifth Euro, and the dehumidification path opening/closing valve provided on the dehumidification path are closed, and The above-mentioned shut-off valve provided on the above-mentioned sixth Euro is opened, and A vehicle heat pump system characterized in that the first electronic expansion valve provided on the second Euro expands the refrigerant supplied from the indoor condenser to the integrated chiller.
In claim 1, In heating/dehumidification mode, The opening/closing valve provided on the sixth euro and the solenoid expansion valve provided on the third euro are closed, and The second electronic expansion valve provided on the fifth Euro and the dehumidification path opening/closing valve provided on the dehumidification path are opened, and A vehicle heat pump system characterized in that the first electronic expansion valve provided on the second Euro expands the refrigerant supplied from the indoor condenser to the outdoor heat exchanger, and the refrigerant supplied from the indoor condenser to the evaporator through the dehumidification path expands while passing through the orifice hole of the solenoid expansion valve.
In claim 1, In heating/defrosting/dehumidification mode, The solenoid expansion valve provided on the third Euro and the second electronic expansion valve provided on the fifth Euro are closed, and The shut-off valve provided on the sixth Euro and the shut-off valve provided on the dehumidification path are opened, A vehicle heat pump system characterized in that the first electronic expansion valve provided on the second Euro expands the refrigerant supplied from the indoor condenser to the integrated chiller, and the refrigerant supplied from the indoor condenser to the evaporator through the dehumidification path expands while passing through the orifice hole of the solenoid expansion valve.

Description

Automotive heat pump system The present invention relates to a heat pump system for a vehicle, and more specifically, to a heat pump system for a vehicle that performs heating and cooling of a vehicle using a refrigerant that has exchanged heat with air in an indoor condenser and an outdoor heat exchanger, and a refrigerant that has exchanged heat with coolant in an integrated chiller. A vehicle air conditioning system typically comprises a cooling system for cooling the interior of a vehicle and a heating system for heating the interior of a vehicle. The cooling system is configured to cool the interior of the vehicle by exchanging heat between the air passing outside the evaporator on the evaporator side of the refrigerant cycle and the refrigerant flowing inside the evaporator, thereby converting it into cold air. The heating system is configured to heat the interior of the vehicle by exchanging heat between the air passing outside the heater core on the heater core side of the coolant cycle and the coolant flowing inside the heater core, thereby converting it into warm air. Meanwhile, unlike the vehicle air conditioning system described above, a heat pump system capable of selectively performing cooling and heating by switching the flow direction of the refrigerant using a single refrigerant cycle is applied, for example, and is equipped with two heat exchangers (i.e., an indoor heat exchanger installed inside the air conditioning case to exchange heat with the air blown into the vehicle interior, and an outdoor heat exchanger outside the air conditioning case to exchange heat) and a directional control valve capable of switching the flow direction of the refrigerant. Accordingly, when the cooling mode is activated according to the flow direction of the refrigerant by the directional control valve, the indoor heat exchanger acts as a cooling heat exchanger, and when the heating mode is activated, the indoor heat exchanger acts as a heating heat exchanger. Various types of such vehicle heat pump systems are being proposed, and a representative example is shown in Fig. 1. A vehicle heat pump system illustrated in FIG. 1 comprises a compressor (30) that compresses and discharges refrigerant, a high-pressure heat exchanger (32) that dissipates heat from the refrigerant discharged from the compressor (30), a first expansion valve (34) and a first bypass valve (36) installed in a parallel structure to selectively pass the refrigerant that has passed through the high-pressure heat exchanger (32), an outdoor heat exchanger (48) that heat-exchanges the refrigerant that has passed through the first expansion valve (34) or the first bypass valve (36) outdoors, a low-pressure heat exchanger (60) that evaporates the refrigerant that has passed through the outdoor heat exchanger (48), an accumulator (62) that separates the refrigerant that has passed through the low-pressure heat exchanger (60) into gaseous and liquid refrigerants, and a heat exchanger for the refrigerant supplied to the low-pressure heat exchanger (60) and the refrigerant returning to the compressor (30). It comprises an internal heat exchanger (50), a second expansion valve (56) that selectively expands the refrigerant supplied to the low-pressure side heat exchanger (60), and a second bypass valve (58) installed in parallel with the second expansion valve (56) to selectively connect the outlet side of the outdoor heat exchanger (48) and the inlet side of the accumulator (62). In FIG. 1, reference numeral 10 represents an air conditioning case in which the high-pressure side heat exchanger (32) and the low-pressure side heat exchanger (60) are housed, reference numeral 12 represents a temperature control door that controls the amount of mixing of cold air and warm air, and reference numeral 20 represents a blower installed at the inlet of the air conditioning case. According to the conventional vehicle heat pump system configured as described above, when the heat pump mode (heating mode) is activated, the first bypass valve (36) and the second expansion valve (56) are closed, and the first expansion valve (34) and the second bypass valve (58) are opened. Additionally, the temperature control door (12) operates as shown in FIG. 1. Accordingly, the refrigerant discharged from the compressor (30) passes through the high-pressure side heat exchanger (32), the first expansion valve (34), the outdoor heat exchanger (48), the high-pressure section (52) of the internal heat exchanger (50), the second bypass valve (58), the accumulator (62), and the low-pressure section (54) of the internal heat exchanger (50) in sequence and returns to the compressor (30). That is, the high-pressure side heat exchanger (32) acts as a heater, and the outdoor heat exchanger (48) acts as an evaporator. When the air conditioner mode (cooling mode) is activated, the first bypass valve (36) and the second expansion valve (56) are opened, and the first expansion valve (34) and th