KR-102962807-B1 - Automotive air conditioning system

KR102962807B1KR 102962807 B1KR102962807 B1KR 102962807B1KR-102962807-B1

Abstract

The present invention comprises: a compressor that compresses an incoming refrigerant and discharges it in a high-temperature, high-pressure gaseous state; an indoor condenser connected to the compressor by a first flow path, into which the high-temperature refrigerant discharged from the compressor flows, and which heats the interior during a heating mode by exchanging heat between the incoming refrigerant and the air flowing within the air conditioning case; a water-cooled condenser connected to the indoor condenser by a second flow path, which draws in the refrigerant discharged from the indoor condenser and condenses the refrigerant through heat exchange with cooling water; an outdoor condenser connected to the water-cooled condenser by a third flow path, which draws in the refrigerant discharged from the water-cooled condenser and condenses the refrigerant through heat exchange with the outside air; and an evaporator connected to the outdoor condenser by a fourth flow path, which draws in the refrigerant discharged from the outdoor condenser, vaporizes the refrigerant, and cools the interior by exchanging heat with the air supplied to the vehicle interior through the air conditioning case. An accumulator positioned adjacent to the compressor and connected to the compressor via the 6th path, and connected to the evaporator via the 5th path, which temporarily stores the refrigerant supplied from the evaporator, separates the incoming refrigerant into liquid refrigerant and gaseous refrigerant, and then supplies the separated gaseous refrigerant to the compressor; a battery chiller provided on a bypass path branched from the 4th path and connected to the 5th path, which cools the battery by heat exchange with battery cooling water during cooling mode and cooling battery cooperation mode; and an expansion valve section provided on the 2nd path, the 4th path, the bypass path, and a dehumidification path branched from the 2nd path and connected to the 4th path, which reduces the pressure of the refrigerant moving through the 2nd path, the 4th path, the bypass path, and the dehumidification path. A vehicle heating and cooling system is provided, comprising: a first branch path connecting to the second path at the first path, and a second branch path connecting to the fifth path at the third path, at the branch path; and a control unit that controls the opening and closing direction of the opening and closing valve unit and the operation of the expansion valve unit in correspondence with each mode. Therefore, within the refrigerant circuit constituting the heat pump system, the refrigerant discharged from the compressor can be bypassed to the indoor condenser under cooling conditions, while under mild cooling and heating conditions, the amount of refrigerant supplied to the indoor condenser can be varied to the extent that temperature control is possible. Additionally, by not installing a temperature control door in the HVAC, various types of fixtures required for mounting such a door can be eliminated, thereby allowing the HVAC to be made slimmer.

Inventors

안병국
박경태

Assignees

주식회사 두원공조

Dates

Publication Date: 20260512
Application Date: 20201126

Claims (12)

A compressor that compresses the incoming refrigerant and discharges it in a high-temperature, high-pressure gaseous state; An indoor condenser connected to the above compressor by a first flow path, into which high-temperature refrigerant discharged from the compressor flows, and which heats the indoor space during heating mode by exchanging heat between the incoming refrigerant and the air flowing within the air conditioning case; A water-cooled condenser connected to the above-mentioned indoor condenser by a second Euro, which draws in refrigerant discharged from the above-mentioned indoor condenser and condenses the refrigerant through heat exchange with cooling water; An outdoor condenser connected to the above-mentioned water-cooled condenser by a third flow path, which draws in refrigerant discharged from the above-mentioned water-cooled condenser and condenses the refrigerant through heat exchange with external air; An evaporator connected to the above-mentioned outdoor condenser by the fourth Euro, which draws in refrigerant discharged from the above-mentioned outdoor condenser, vaporizes the refrigerant, and cools the interior by exchanging heat with the air supplied to the vehicle interior through the above-mentioned air conditioning case; An accumulator positioned adjacent to the compressor and connected to the compressor by a sixth path, and connected to the evaporator by a fifth path, which temporarily stores the refrigerant supplied from the evaporator, separates the incoming refrigerant into liquid refrigerant and gaseous refrigerant, and then supplies the separated gaseous refrigerant to the compressor; A battery chiller provided on a bypass path that branches off from the above-mentioned fourth euro and connects to the above-mentioned fifth euro, and cools the battery by heat exchange with battery coolant during cooling mode and cooling battery cooperation mode; An expansion valve section provided on the second flow path, the fourth flow path, the bypass flow path, and the dehumidification flow path branched from the second flow path and connected to the fourth flow path, for depressurizing the refrigerant moving to the second flow path, the fourth flow path, the bypass flow path, and the dehumidification flow path; An opening/closing valve section provided at the point where a first branch path connecting to the second path branches off from the first path, and at the point where a second branch path connecting to the fifth path branches off from the third path; and It includes a control unit that controls the opening/closing direction of the opening/closing valve unit and the operation of the expansion valve unit in correspondence with each mode, The above expansion valve section is, A first electronic expansion valve provided at the front end of the water-cooled condenser on the second Euro above, which expands and reduces the pressure of the refrigerant supplied from the indoor condenser to the water-cooled condenser during heating mode and mild mode, and A solenoid expansion valve provided at the front end of the evaporator on the fourth path, which expands and reduces the pressure of the refrigerant supplied to the evaporator through the fourth path during cooling mode, cooling battery cooperative mode, and mild mode; A second electronic expansion valve provided at the front end of the battery chiller on the bypass path and which expands and reduces the pressure of the refrigerant supplied to the battery chiller through the bypass path during the cooling battery cooperation mode, and It includes a third electronic expansion valve provided on the dehumidification path that branches off from the second path and connects to the fourth path, and opens and closes the dehumidification path. A vehicle heating and cooling system characterized in that, in mild mode, the refrigerant expanded by the third electronic expansion valve of the dehumidification path flows into the evaporator through the orifice hole of the solenoid expansion valve.
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A compressor that compresses the incoming refrigerant and discharges it in a high-temperature, high-pressure gaseous state; An indoor condenser connected to the above compressor by a first flow path, into which high-temperature refrigerant discharged from the compressor flows, and which heats the indoor space during heating mode by exchanging heat between the incoming refrigerant and the air flowing within the air conditioning case; A water-cooled condenser connected to the above-mentioned indoor condenser by a second Euro, which draws in refrigerant discharged from the above-mentioned indoor condenser and condenses the refrigerant through heat exchange with cooling water; An outdoor condenser connected to the above-mentioned water-cooled condenser by a third flow path, which draws in refrigerant discharged from the above-mentioned water-cooled condenser and condenses the refrigerant through heat exchange with external air; An evaporator connected to the above-mentioned outdoor condenser by the fourth Euro, which draws in refrigerant discharged from the above-mentioned outdoor condenser, vaporizes the refrigerant, and cools the interior by exchanging heat with the air supplied to the vehicle interior through the above-mentioned air conditioning case; An accumulator positioned adjacent to the compressor and connected to the compressor by a sixth path, and connected to the evaporator by a fifth path, which temporarily stores the refrigerant supplied from the evaporator, separates the incoming refrigerant into liquid refrigerant and gaseous refrigerant, and then supplies the separated gaseous refrigerant to the compressor; A battery chiller provided on a bypass path that branches off from the above-mentioned fourth euro and connects to the above-mentioned fifth euro, and cools the battery by heat exchange with battery coolant during cooling mode and cooling battery cooperation mode; An expansion valve section provided on the second flow path, the fourth flow path, the bypass flow path, and the dehumidification flow path branched from the second flow path and connected to the fourth flow path, for depressurizing the refrigerant moving to the second flow path, the fourth flow path, the bypass flow path, and the dehumidification flow path; An opening/closing valve section provided at the point where a first branch path connecting to the second path branches off from the first path, and at the point where a second branch path connecting to the fifth path branches off from the third path; and It includes a control unit that controls the opening/closing direction of the opening/closing valve unit and the operation of the expansion valve unit in correspondence with each mode, The above-mentioned opening and closing valve section is, A first shut-off valve provided at the point where the first branch path branches off from the first path, for controlling the flow direction of the refrigerant moving to the first path, and It includes a second shut-off valve provided at the point where the second branch path branches off from the third path, which controls the flow direction of the refrigerant moving to the third path. A vehicle heating and cooling system characterized in that the first shut-off valve and the second shut-off valve use 3-way valves.
In claim 3, A vehicle heating and cooling system characterized in that the first shut-off valve and the second shut-off valve can be simultaneously opened in the direction of the indoor condenser and the direction of the first branch path, and in the direction of the outdoor condenser and the direction of the second branch path, and can be partially opened to allow refrigerant to flow simultaneously according to the differential pressure of each refrigerant circuit.
In claim 4, The first shut-off valve and the second shut-off valve switch their opening and closing directions by the rotational movement of a ball provided inside, A vehicle heating and cooling system characterized by the ability to control the discharge amount step by step according to the rotation of the ball.
In claim 1, A vehicle heating and cooling system further comprising a sensor unit that measures the pressure and temperature of the first and sixth lanes, provided on a first lane adjacent to the indoor condenser and a sixth lane adjacent to the compressor.
In claim 6, The sensor unit above is, A first sensor for measuring the temperature and pressure of the first flow path adjacent to the indoor condenser, and It includes a second sensor provided on the sixth path adjacent to the compressor and measuring the pressure and temperature of the sixth path, A vehicle heating and cooling system characterized in that the sensor unit is connected to the control unit.
In claim 6, In cooling mode, The third electronic expansion valve of the expansion valve unit provided on the dehumidification path is closed, the first shut-off valve of the shut-off valve unit provided at the point where the first branch path branches on the first path is opened in the direction of the first branch path, and the second shut-off valve of the shut-off valve unit provided at the point where the second branch path branches on the third path is opened in the direction of the outdoor condenser. A vehicle heating and cooling system characterized in that the first electronic expansion valve of the expansion valve section provided on the second path is opened, the second electronic expansion valve of the expansion valve section provided on the bypass path is closed, and the solenoid expansion valve of the expansion valve section provided on the fourth path expands the refrigerant supplied to the evaporator through the fourth path.
In claim 6, In heating mode, The third electronic expansion valve of the expansion valve unit provided on the dehumidification path is closed, the first shut-off valve of the shut-off valve unit provided at the point where the first branch path branches on the first path is opened toward the indoor condenser, and the second shut-off valve of the shut-off valve unit provided at the point where the second branch path branches on the third path is opened toward the second branch path. A vehicle heating and cooling system characterized in that the solenoid expansion valve of the expansion valve section provided on the fourth path and the second electronic expansion valve of the expansion valve section provided on the bypass path are closed, and the first electronic expansion valve of the expansion valve section provided on the second path expands the refrigerant supplied to the water-cooled condenser through the second path.
In claim 6, In heating/dehumidification mode, The third electronic expansion valve of the expansion valve unit provided on the dehumidification path is opened to expand the refrigerant, the first shut-off valve of the shut-off valve unit provided at the point where the first branch path branches on the first path is opened toward the indoor condenser, and the second shut-off valve of the shut-off valve unit provided at the point where the second branch path branches on the third path is opened toward both the second branch path and the outdoor condenser. A vehicle heating and cooling system characterized in that the second electronic expansion valve of the expansion valve section provided on the bypass path is closed, the solenoid expansion valve of the expansion valve section provided on the fourth path is opened, the first electronic expansion valve of the expansion valve section provided on the second path expands the refrigerant supplied to the water-cooled condenser through the second path, and the refrigerant supplied to the fourth path through the dehumidification path passes through the orifice hole of the solenoid expansion valve.
In claim 6, In mild mode, The third electronic expansion valve of the expansion valve unit provided on the dehumidification path is opened, the first shut-off valve of the shut-off valve unit provided at the point where the first branch path branches on the first path is opened toward the indoor condenser and toward the first branch path, and the second shut-off valve of the shut-off valve unit provided at the point where the second branch path branches on the third path is opened toward the outdoor condenser and toward the second branch path. A vehicle heating and cooling system characterized in that the second electronic expansion valve of the expansion valve section provided on the bypass path is closed, the solenoid expansion valve of the expansion valve section provided on the fourth path is opened, the first electronic expansion valve of the expansion valve section provided on the second path expands the refrigerant supplied to the water-cooled condenser through the second path, and the refrigerant supplied to the fourth path through the dehumidification path passes through the orifice hole of the solenoid expansion valve.
In claim 6, When in cooling battery cooperation mode, The third electronic expansion valve of the expansion valve unit provided on the dehumidification path is closed, the first shut-off valve of the shut-off valve unit provided at the point where the first branch path branches on the first path is opened in the direction of the first branch path, and the second shut-off valve of the shut-off valve unit provided at the point where the second branch path branches on the third path is opened in the direction of the outdoor condenser. A vehicle heating and cooling system characterized in that the first electronic expansion valve of the expansion valve section provided on the second path is opened, and the solenoid expansion valve of the expansion valve section provided on the fourth path and the second electronic expansion valve of the expansion valve section provided on the bypass path expand the refrigerant supplied to the evaporator through the fourth path and the refrigerant supplied to the battery chiller through the bypass path.

Description

Automotive air conditioning system The present invention relates to a vehicle heating and cooling system, and more specifically, to a vehicle heating and cooling system that performs heating and cooling of a vehicle using a refrigerant that has exchanged heat with coolant in a water-cooled condenser. 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 evaporator 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 the second bypass valve (58) are closed. Additionally, the temperature control door (12) closes the