Vehicle air conditioning system for providing liquid cooling and liquid heat and control method of vehicle air conditioning system

Abstract

The invention belongs to the technical field of new energy automobile air conditioners, and provides a vehicle air conditioning system for providing liquid cooling and liquid heat and a control method thereof, the vehicle air conditioning system comprises a compressor, a four-way reversing valve, an outdoor heat exchanger, a cabin heat exchanger, a three-way valve, a plate heat exchanger, a cooling liquid circulating pump and a cooling / heating unit; a four-way reversing valve and a three-way valve are arranged in the system, and a liquid cooling and liquid heating function is added on the basis of cooling / heating of a vehicle cabin, so that multiple working modes are generated in a crossed and expanded manner, and the requirements of a full application scene of the heat management system are met; particularly, amp heating of a vehicle cabin is achieved; and in the liquid heating mode, cabin heating and liquid heating are both provided by the heat pump system, the traditional high-energy-consumption heating mode only using PTC is avoided, and the heating working condition is more energy-saving.

Description

Technical Field

[0001] The present invention belongs to the technical field of new energy automobile air conditioning, and in particular relates to a vehicle air conditioning system providing liquid cooling and liquid heating and a control method thereof. Background Art

[0002] The production and sales ratio of pure electric new energy vehicles is gradually increasing, which is one of the important development directions of new energy vehicles in the future. However, the performance and safety of the power battery of pure electric vehicles are sensitive to the operating temperature, and reliable thermal management is required to maintain a specific temperature range; in addition, pure electric vehicles have no waste heat to utilize, and their range in winter is seriously reduced. In order to further improve vehicle performance, an integrated thermal management system based on heat pump air conditioning and liquid cooling and liquid heating technology is a future development trend.

[0003] The current integrated thermal management system can achieve coordinated cabin cooling and liquid cooling. Liquid heating still mainly relies on PTC heating and does not use heat pumps. It is even more difficult to further meet the various cross-working modes of cabin cooling and heating and liquid cooling and heating. As a result, the current air-conditioning structure and circulation method cannot meet the multi-scenario application of the thermal management system. Summary of the invention

[0004] In order to solve the above problems, the present invention proposes a vehicle air-conditioning system that provides liquid cooling and liquid heating and a control method thereof. By arranging a four-way reversing valve and a three-way valve in the system, liquid cooling and liquid heating functions are added on the basis of cabin cooling / heating, thereby cross-exchanging and expanding a variety of working modes to meet the needs of all application scenarios of the thermal management system; in particular, when realizing the cabin heating & liquid heating mode, the cabin heating and liquid heating are both provided by the heat pump system, avoiding the traditional high-energy consumption heating method of using only PTC, and the heating condition is more energy-efficient.

[0005] In order to achieve the above-mentioned object, in a first aspect, the present invention provides a vehicle air conditioning system providing liquid cooling and liquid heating, which adopts the following technical solutions:

[0006] A vehicle air conditioning system providing liquid cooling and liquid heating, comprising a compressor, a four-way reversing valve, an outdoor heat exchanger, a cabin heat exchanger, a three-way valve, a plate heat exchanger, a coolant circulation pump and a cooling / heating unit;

[0007] The compressor outlet is connected to the first four-way interface of the four-way reversing valve on one path, and to the first three-way interface of the three-way valve on the other path; the second four-way interface of the four-way reversing valve is connected to the first interface of the outdoor heat exchanger, the second interface of the outdoor heat exchanger is connected to the first interface of the cabin heat exchanger on one path, the second interface of the cabin heat exchanger is connected to the fourth four-way interface of the four-way reversing valve, the third four-way interface of the four-way reversing valve and the second three-way interface of the three-way valve are both connected to the inlet of the compressor; the second interface of the outdoor heat exchanger is connected to the first interface on the refrigerant side of the plate heat exchanger on the other path, the second interface on the refrigerant side of the plate heat exchanger is connected to the third three-way interface of the three-way valve, and the coolant side of the plate heat exchanger is connected to the cold / heat unit and the coolant circulation pump in sequence.

[0008] Furthermore, a stop valve and a first throttle valve are provided between the outdoor heat exchanger and the cabin heat exchanger; a second throttle valve is provided between the outdoor heat exchanger and the plate heat exchanger;

[0009] The second interface of the outdoor heat exchanger is connected to the first interface of the stop valve, the second interface of the stop valve is connected to the first interface of the first throttle valve in one way, and is connected to the first interface of the second throttle valve in the other way; the second interface of the first throttle valve is connected to the first interface of the cabin heat exchanger, and the second interface of the cabin heat exchanger is connected to the fourth four-way interface of the four-way reversing valve; the second interface of the second throttle valve is connected to the first interface on the refrigerant side of the plate heat exchanger.

[0010] In order to achieve the above-mentioned purpose, in a second aspect, the present invention further provides a vehicle air conditioning system control method providing liquid cooling and liquid heating, which adopts the following technical scheme:

[0011] A control method for a vehicle air conditioning system providing liquid cooling and liquid heating adopts the vehicle air conditioning system providing liquid cooling and liquid heating as described in the first aspect, including a first four-way interface and a fourth four-way interface connected, a second four-way interface and a fourth four-way interface connected, a first three-way interface and a third three-way interface connected, and a first throttle valve, a second throttle valve and a stop valve are all opened; the high-temperature and high-pressure gaseous refrigerant at the compressor outlet is divided into two paths, one path flows into the cabin heat exchanger through the first four-way interface and the fourth four-way interface path to condense and release heat to become a high-pressure liquid phase, heats the air inside the cabin, and then throttles and reduces the pressure through the first throttle valve, and the other path flows into the plate heat exchanger through the first three-way interface and the third three-way interface path to condense and release heat, heats the coolant, and then throttles and reduces the pressure through the second throttle valve, the two fluids are mixed and flow into the outdoor heat exchanger to absorb heat and evaporate, the vaporized refrigerant flows into the suction port of the compressor through the second four-way interface and the third four-way interface path, the coolant circulation pump works, and drives the high-temperature coolant to the heat-using unit.

[0012] Furthermore, the first four-way interface and the second four-way interface are connected, and the third four-way interface and the fourth four-way interface are connected; the three-way valve is closed, the first throttle valve is opened, the second throttle valve is closed, and the stop valve is opened, and the high-temperature and high-pressure gaseous refrigerant at the compressor outlet flows in from the first four-way interface and flows out from the second four-way interface, and then enters the outdoor heat exchanger to release heat and condense into a high-pressure liquid phase. After throttling and reducing the pressure by the first throttle valve, it flows into the cabin heat exchanger to absorb heat and evaporate, cooling the air inside the cabin, and the vaporized refrigerant flows into the suction port of the compressor through the third four-way interface and the fourth four-way interface of the four-way reversing valve.

[0013] Furthermore, the first four-way interface is connected to the fourth four-way interface, and the second four-way interface is connected to the third four-way interface; the three-way valve is closed, the first throttle valve is opened, the second throttle valve is closed, and the stop valve is opened; the high-temperature and high-pressure gaseous refrigerant at the compressor outlet flows in from the first four-way interface of the four-way reversing valve and flows out from the fourth four-way interface, then enters the cabin heat exchanger to condense and release heat to become a high-pressure liquid phase, heating the air inside the cabin, and then flows into the outdoor heat exchanger to absorb heat and evaporate after throttling and reducing the pressure through the first throttle valve, and the vaporized refrigerant flows into the suction port of the compressor through the second four-way interface and the third interface of the four-way reversing valve.

[0014] Furthermore, the first four-way interface and the second four-way interface are connected, the third four-way interface and the fourth four-way interface are connected, the second three-way interface and the third three-way interface are connected, the first throttle valve is closed, the second throttle valve is opened, and the stop valve is opened; the high-temperature and high-pressure gaseous refrigerant at the compressor outlet flows in from the first four-way interface of the four-way reversing valve, flows out from the second four-way interface, and then enters the outdoor heat exchanger to release heat and condense into a high-pressure liquid phase. After throttling and reducing the pressure by the second throttle valve, it flows into the plate heat exchanger to absorb heat and evaporate, cooling the coolant. The vaporized refrigerant flows into the suction port of the compressor through the second three-way interface and the third three-way interface of the three-way valve, and the coolant circulation pump works to drive the low-temperature coolant to the cold unit.

[0015] Furthermore, the first four-way interface and the fourth four-way interface of the four-way reversing valve are connected, the second four-way interface and the third four-way interface are connected, the first three-way interface and the third three-way interface are connected, the first throttle valve is closed, the second throttle valve is opened, and the stop valve is opened; the high-temperature and high-pressure gaseous refrigerant at the compressor outlet flows into the plate heat exchanger through the first three-way interface and the third three-way interface to condense and release heat, heating the coolant, and the liquefied refrigerant is throttled and reduced in pressure by the second throttle valve, and then flows into the outdoor heat exchanger to absorb heat and evaporate, and the vaporized refrigerant flows into the suction port of the compressor through the second four-way interface and the third four-way interface, and the coolant circulation pump works to drive the high-temperature coolant to the heat-using unit.

[0016] Furthermore, the first four-way interface and the second four-way interface are connected, the third four-way interface and the fourth four-way interface are connected, the second three-way interface and the third three-way interface are connected, and the first throttle valve, the second throttle valve and the stop valve are all opened; the high-temperature and high-pressure gaseous refrigerant at the compressor outlet flows in through the first four-way interface of the four-way reversing valve, flows out through the second four-way interface, and then enters the outdoor heat exchanger to release heat and condense into a high-pressure liquid phase. After throttling and reducing the pressure through the first throttle valve, one path flows into the cabin heat exchanger to absorb heat and evaporate, cooling the air inside the cabin. The vaporized refrigerant flows into the suction port of the compressor through the third four-way interface and the fourth four-way interface of the four-way reversing valve. After throttling and reducing the pressure through the second throttle valve, the other path flows into the plate heat exchanger to absorb heat and evaporate, cooling the coolant. The vaporized refrigerant flows into the suction port of the compressor through the second three-way interface and the third three-way interface. The coolant circulation pump works to drive the low-temperature coolant to the cold unit.

[0017] Furthermore, the third four-way interface and the fourth four-way interface are connected, the first three-way interface and the third three-way interface are connected, the first throttle valve and the second throttle valve are opened, and the stop valve is closed; the high-temperature and high-pressure gaseous refrigerant at the compressor outlet flows into the plate heat exchanger through the first three-way interface and the third three-way interface to condense and release heat, heating the coolant, and the liquefied refrigerant is throttled and reduced in pressure by the second throttle valve and the first throttle valve in turn, and then flows into the cabin heat exchanger to absorb heat and evaporate, cooling the air inside the cabin, and the vaporized refrigerant flows into the suction port of the compressor through the third four-way interface and the fourth four-way interface, and the coolant circulation pump works to drive the high-temperature coolant to the heat-using unit.

[0018] Furthermore, the first four-way interface and the fourth four-way interface are connected, the second three-way interface and the third three-way interface are connected, the first throttle valve and the second throttle valve are opened, and the cut-off valve is closed; the high-temperature and high-pressure gaseous refrigerant at the compressor outlet flows into the cabin heat exchanger through the first four-way interface and the fourth four-way interface to condense and release heat to become a high-pressure liquid phase, heating the air inside the cabin, and then throttles and reduces the pressure through the first throttle valve and the second throttle valve in turn, flows into the plate heat exchanger to absorb heat and evaporate, cools the coolant, and the vaporized refrigerant flows into the suction port of the compressor through the second three-way interface and the third three-way interface, the coolant circulation pump works, and drives the low-temperature coolant to the cold unit.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. In the present invention, a four-way reversing valve and a three-way valve are arranged in the system, and on the basis of cabin cooling / heating, the functions of liquid cooling and liquid heating are added, thereby cross-extension and expansion generate multiple working modes to meet the needs of all application scenarios of the thermal management system; especially when the cabin heating & liquid heating mode is realized, the first four-way interface is connected to the fourth four-way interface, the second four-way interface is connected to the fourth four-way interface, and the first three-way interface is connected to the third three-way interface; the high-temperature and high-pressure gaseous refrigerant at the outlet of the compressor is divided into two paths, one of which passes through the first four-way interface and the fourth four-way interface. The refrigerant flows into the cabin heat exchanger to condense and release heat as a high-pressure liquid phase, heating the air inside the cabin. The other path flows into the plate heat exchanger through the first three-way interface and the third three-way interface to condense and release heat, heating the coolant. The two fluids are mixed and flow into the outdoor heat exchanger to absorb heat and evaporate. The vaporized refrigerant flows into the air intake of the compressor through the second four-way interface and the third four-way interface. The coolant circulation pump starts to drive the high-temperature coolant to the heat unit. The cabin heating and liquid heat are both provided by the heat pump system, avoiding the traditional high-energy consumption heating method of using only PTC, and the heating condition is more energy-saving.

[0021] 2. In the present invention, the refrigerant circulation loop is thermally coupled with the cooling water circulation loop via a plate heat exchanger, the system integration is higher, waste heat recovery and utilization can be realized in multiple scenarios, and energy utilization is more sufficient.

[0022] 3. The present invention can realize 8 working modes of cabin cooling, heating, liquid cooling and liquid heating through valve switching circulation process. The refrigerant circuit and the coolant circuit are thermally coupled, and have the ability to recover waste heat in multiple scenarios. The system has high system integration, comprehensive working modes and more effective energy utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings in the specification that constitute a part of this embodiment are used to provide a further understanding of this embodiment. The schematic embodiments of this embodiment and their descriptions are used to explain this embodiment and do not constitute improper limitations on this embodiment.

[0024] Figure 1 This is a system schematic diagram of Embodiment 1 of the present invention;

[0025] Among them, 1. compressor; 2- four-way reversing valve; a. first four-way interface; b. second four-way interface; c. third four-way interface; d. fourth four-way interface; 3. outdoor heat exchanger; 4. stop valve; 5. first throttle valve; 6. cabin heat exchanger; 7. three-way valve; A. first three-way interface; B. second three-way interface; C. third three-way interface; 8. second throttle valve; 9. plate heat exchanger; 10- coolant circulation pump; 11. cold / hot unit. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0027] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0028] PTC heating element, composed of PTC ceramic heating element and aluminum tube, has the advantages of small thermal resistance and high heat exchange efficiency. It is an automatic constant temperature and power saving electric heater.

[0029] Embodiment 1:

[0030] like Figure 1 As shown, this embodiment provides a vehicle air-conditioning system that provides liquid cooling and liquid heating, including a compressor 1, a four-way reversing valve 2, an outdoor heat exchanger 3, a stop valve 4, a first throttle valve 5, a cabin heat exchanger 6, a three-way valve 7, a second throttle valve 8, a plate heat exchanger 9, a coolant circulation pump 10 and a cooling / heating unit 11.

[0031] Optionally, the outlet of the compressor 1 is connected to the first four-way interface a of the four-way reversing valve 2 in one way, and to the first three-way interface A of the three-way valve 7 in another way, the second four-way interface b of the four-way reversing valve 2 is connected to the first interface of the outdoor heat exchanger 3, the second interface of the outdoor heat exchanger 3 is connected to the first interface of the stop valve 4, the second interface of the stop valve 4 is connected to the first interface of the first throttle valve 5 in one way, and to the first interface of the second throttle valve 8 in another way, the second interface of the first throttle valve 5 is connected to the first interface of the cabin heat exchanger 6, and the The second interface of the cabin heat exchanger 6 is connected to the fourth four-way interface b of the four-way reversing valve 2, the third four-way interface b of the four-way reversing valve 2 and the second three-way interface B of the three-way valve 7 are both connected to the inlet of the compressor 1, the second interface of the second throttle valve 8 is connected to the first interface on the refrigerant side of the plate heat exchanger 9, the second interface on the refrigerant side of the plate heat exchanger 9 is connected to the third three-way interface B of the three-way valve 7, and the coolant side of the plate heat exchanger 9 is connected to the cold / heat unit 11 and the coolant circulation pump 10 in sequence, thereby forming a coolant circulation loop.

[0032] The system's operating modes include eight operating modes: cabin cooling, cabin heating, liquid cooling, liquid heating, cabin cooling & liquid cooling, cabin cooling & liquid heating, cabin heating & liquid cooling, and cabin heating & liquid heating.

[0033] Embodiment 2:

[0034] This embodiment provides a method for controlling a vehicle air conditioning system that provides liquid cooling and liquid heating, and adopts a vehicle air conditioning system that provides liquid cooling and liquid heating described in Embodiment 1. Specifically, when executing each mode:

[0035] Cabin cooling mode: the first four-way interface a and the second four-way interface b of the four-way reversing valve 2 are connected, and the third four-way interface c and the fourth four-way interface d are connected; the three-way valve 7 is closed, the first throttle valve 5 is opened, the second throttle valve 8 is closed, and the stop valve 4 is opened.

[0036] Specifically, the high-temperature and high-pressure gaseous refrigerant at the outlet of the compressor 1 flows in through the first four-way interface a and flows out through the second four-way interface b, then enters the outdoor heat exchanger 3 to release heat and condense into a high-pressure liquid phase, and after throttling and reducing the pressure through the first throttle valve 5, flows into the cabin heat exchanger 6 to absorb heat and evaporate, thereby cooling the air inside the cabin. The vaporized refrigerant flows into the intake port of the compressor 1 through the third four-way interface c and the fourth four-way interface d of the four-way reversing valve 2, thereby completing the cycle.

[0037] Cabin heating mode: the first four-way interface a and the fourth interface d of the four-way reversing valve 2 are connected, and the second four-way interface b and the third interface c are connected; the three-way valve 7 is closed, the first throttle valve 5 is opened, the second throttle valve 8 is closed, and the stop valve 4 is opened.

[0038] Specifically, the high-temperature and high-pressure gaseous refrigerant at the outlet of the compressor 1 flows in through the first four-way interface a of the four-way reversing valve and flows out through the fourth four-way interface b, then enters the cabin heat exchanger 6 to condense and release heat to become a high-pressure liquid phase, heating the air inside the cabin, and then flows into the outdoor heat exchanger 3 to absorb heat and evaporate after throttling and reducing the pressure through the first throttle valve 5. The vaporized refrigerant flows into the intake port of the compressor 1 through the second four-way interface b and the third interface c of the four-way reversing valve 2, completing the cycle.

[0039] Liquid cooling mode: the first four-way interface a and the second four-way interface b of the four-way reversing valve 2 are connected, the third four-way interface c and the fourth four-way interface d are connected, the second three-way interface B and the third three-way interface C of the three-way valve are connected, the first throttle valve 5 is closed, the second throttle valve 8 is open, and the stop valve 4 is open.

[0040] Specifically, the high-temperature and high-pressure gaseous refrigerant at the outlet of the compressor 1 flows in through the first four-way interface a of the four-way reversing valve, flows out through the second four-way interface b, then enters the outdoor heat exchanger 3 to release heat and condense into a high-pressure liquid phase, and after throttling and reducing the pressure through the second throttle valve 8, flows into the plate heat exchanger 9 to absorb heat and evaporate, cooling the coolant. The vaporized refrigerant flows into the suction port of the compressor 1 through the second three-way interface B and the third three-way interface C of the three-way valve 7, completing the cycle. The coolant circulation pump 10 works to drive the low-temperature coolant to the cold unit.

[0041] Liquid heating mode: the first four-way interface a and the fourth four-way interface d of the four-way reversing valve 2 are connected, the second four-way interface b and the third four-way interface c are connected, the first three-way interface A and the third three-way interface C of the three-way valve 7 are connected, the first throttle valve 5 is closed, the second throttle valve 8 is open, and the stop valve 4 is open.

[0042] Specifically, the high-temperature and high-pressure gaseous refrigerant at the outlet of the compressor 1 flows into the plate heat exchanger 9 through the first three-way interface A and the third three-way interface C of the three-way valve 7 to condense and release heat, heating the coolant. The liquefied refrigerant is throttled and reduced in pressure by the second throttle valve 8, and then flows into the outdoor heat exchanger 3 to absorb heat and evaporate. The vaporized refrigerant flows into the suction port of the compressor 1 through the second four-way interface b and the third four-way interface c of the four-way reversing valve 2 to complete the cycle. The coolant circulation pump 10 starts to drive the high-temperature coolant to the heat-using unit.

[0043] Cabin cooling & liquid cooling mode: the first four-way interface a and the second four-way interface b of the four-way reversing valve 2 are connected, the third four-way interface c and the fourth four-way interface d are connected, the second three-way interface B and the third three-way interface C of the three-way valve 7 are connected, and the first throttle valve 5, the second throttle valve 8 and the stop valve 4 are all open.

[0044] Specifically, the high-temperature and high-pressure gaseous refrigerant at the outlet of the compressor 1 flows in through the first four-way interface a of the four-way reversing valve, flows out through the second four-way interface b, and then enters the outdoor heat exchanger 3 to release heat and condense into a high-pressure liquid phase. One path is throttled and reduced in pressure by the first throttle valve 5, and then flows into the cabin heat exchanger 6 to absorb heat and evaporate, thereby cooling the air inside the cabin. The vaporized refrigerant flows into the air intake port of the compressor 1 through the third four-way interface c and the fourth four-way interface d of the four-way reversing valve 2. The other path is throttled and reduced in pressure by the second throttle valve 8, and then flows into the plate heat exchanger 9 to absorb heat and evaporate, thereby cooling the coolant. The vaporized refrigerant flows into the air intake port of the compressor 1 through the second three-way interface B and the third three-way interface C of the three-way valve 7, thereby completing the cycle. The coolant circulation pump 10 works to drive the low-temperature coolant to the cold unit.

[0045] Cabin cooling & liquid heating mode: the first four-way interface a and the second four-way interface b of the four-way reversing valve 2 are connected, the third four-way interface c and the fourth four-way interface d are connected, the first three-way interface A and the third three-way interface C of the three-way valve 7 are connected, the first throttle valve 5 and the second throttle valve 8 are opened, and the stop valve 4 is closed.

[0046] Specifically, the high-temperature and high-pressure gaseous refrigerant at the outlet of the compressor 1 flows into the plate heat exchanger 9 through the first three-way interface A and the third three-way interface C of the three-way valve 7 to condense and release heat, thereby heating the coolant. The liquefied refrigerant is throttled and reduced in pressure by the second throttle valve 8 and the first throttle valve 5 in turn, and then flows into the cabin heat exchanger 6 to absorb heat and evaporate, thereby cooling the air inside the cabin. The vaporized refrigerant flows into the air intake port of the compressor 1 through the fourth four-way interface d and the third four-way interface c of the four-way reversing valve 2, thereby completing the cycle. The coolant circulation pump 10 starts to work, driving the high-temperature coolant to the heat-using unit.

[0047] Cabin heating & liquid cooling mode: the first four-way interface a and the fourth four-way interface d of the four-way reversing valve 2 are connected, the second four-way interface b and the third four-way interface c are connected, the second three-way interface B and the third three-way interface C of the three-way valve 7 are connected, the first throttle valve 5 and the second throttle valve 8 are opened, and the stop valve 4 is closed.

[0048] Specifically, the high-temperature and high-pressure gaseous refrigerant at the outlet of the compressor 1 flows into the cabin heat exchanger 6 through the first four-way interface a and the fourth four-way interface d of the four-way reversing valve 2 to condense and release heat into a high-pressure liquid phase, heating the air inside the cabin, and then throttles and reduces the pressure through the first throttle valve 5 and the second throttle valve 8 in sequence, flows into the plate heat exchanger 9 to absorb heat and evaporate, and cools the coolant. The vaporized refrigerant flows into the intake port of the compressor 1 through the second three-way interface B and the third three-way interface C of the three-way valve 7 to complete the cycle, and the coolant circulation pump 10 starts to drive the low-temperature coolant to the cold unit.

[0049] Cabin heating & liquid heating mode: the first four-way interface a and the fourth four-way interface d of the four-way reversing valve 2 are connected, the second four-way interface b and the third four-way interface c are connected, the first three-way interface A and the third three-way interface C of the three-way valve 7 are connected, and the first throttle valve 5, the second throttle valve 8 and the stop valve 4 are all open.

[0050] Specifically, the high-temperature and high-pressure gaseous refrigerant at the outlet of the compressor 1 is divided into two paths. One path flows into the cabin heat exchanger 6 through the first four-way interface a and the fourth four-way interface d of the four-way reversing valve 2 to condense and release heat to become a high-pressure liquid phase, heating the air inside the cabin, and then throttles and reduces the pressure through the first throttle valve 5. The other path flows into the plate heat exchanger 9 through the first three-way interface A and the third three-way interface C of the three-way valve 7 to condense and release heat, heating the coolant, and then throttles and reduces the pressure through the second throttle valve 8. After the two fluids are mixed, they flow into the outdoor heat exchanger 3 to absorb heat and evaporate. The vaporized refrigerant flows into the suction port of the compressor 1 through the second four-way interface b and the third four-way interface c of the four-way reversing valve 2 to complete the cycle. The coolant circulation pump 10 works to drive the high-temperature coolant to the heat-using unit.

[0051] The above description is only a preferred embodiment of the present embodiment and is not intended to limit the present embodiment. For those skilled in the art, the present embodiment may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present embodiment shall be included in the protection scope of the present embodiment.

Claims

1. A vehicle air conditioning system providing liquid cooling and liquid heating, characterized in that: It includes a compressor, a four-way reversing valve, an outdoor heat exchanger, a cabin heat exchanger, a three-way valve, a plate heat exchanger, a coolant circulation pump and a cooling / heating unit; The compressor outlet is connected to the first four-way interface of the four-way reversing valve on one path, and to the first three-way interface of the three-way valve on the other path; the second four-way interface of the four-way reversing valve is connected to the first interface of the outdoor heat exchanger, the second interface of the outdoor heat exchanger is connected to the first interface of the cabin heat exchanger on one path, the second interface of the cabin heat exchanger is connected to the fourth four-way interface of the four-way reversing valve, the third four-way interface of the four-way reversing valve and the second three-way interface of the three-way valve are both connected to the inlet of the compressor; the second interface of the outdoor heat exchanger is connected to the first interface on the refrigerant side of the plate heat exchanger on the other path, the second interface on the refrigerant side of the plate heat exchanger is connected to the third three-way interface of the three-way valve, and the coolant side of the plate heat exchanger is connected to the cold / heat unit and the coolant circulation pump in sequence.

2. A vehicle air conditioning system providing liquid cooling and liquid heating as claimed in claim 1, characterized in that: A shutoff valve and a first throttle valve are provided between the outdoor heat exchanger and the cabin heat exchanger; a second throttle valve is provided between the outdoor heat exchanger and the plate heat exchanger; The second interface of the outdoor heat exchanger is connected to the first interface of the stop valve, the second interface of the stop valve is connected to the first interface of the first throttle valve in one way, and is connected to the first interface of the second throttle valve in the other way; the second interface of the first throttle valve is connected to the first interface of the cabin heat exchanger, and the second interface of the cabin heat exchanger is connected to the fourth four-way interface of the four-way reversing valve; the second interface of the second throttle valve is connected to the first interface on the refrigerant side of the plate heat exchanger.

3. A method for controlling a vehicle air conditioning system providing liquid cooling and liquid heating, characterized in that: A vehicle air conditioning system for providing liquid cooling and liquid heating as described in any one of claims 1 to 2 is adopted, including a first four-way interface and a fourth four-way interface connected, a second four-way interface and a fourth four-way interface connected, a first three-way interface and a third three-way interface connected, and a first throttle valve, a second throttle valve and a stop valve are all opened; the high-temperature and high-pressure gaseous refrigerant at the compressor outlet is divided into two paths, one path flows into the cabin heat exchanger through the first four-way interface and the fourth four-way interface path to condense and release heat to become a high-pressure liquid phase, heats the air inside the cabin, and then throttles and reduces the pressure through the first throttle valve, and the other path flows into the plate heat exchanger through the first three-way interface and the third three-way interface path to condense and release heat, heats the coolant, and then throttles and reduces the pressure through the second throttle valve, and the two fluids are mixed and flow into the outdoor heat exchanger to absorb heat and evaporate, and the vaporized refrigerant flows into the suction port of the compressor through the second four-way interface and the third four-way interface path, and the coolant circulation pump works to drive the high-temperature coolant to the heat-using unit.

4. A method for controlling a vehicle air conditioning system providing liquid cooling and liquid heating as claimed in claim 3, characterized in that: The first four-way interface is connected to the second four-way interface, and the third four-way interface is connected to the fourth four-way interface; the three-way valve is closed, the first throttle valve is opened, the second throttle valve is closed, and the stop valve is opened. The high-temperature and high-pressure gaseous refrigerant at the compressor outlet flows in from the first four-way interface and flows out from the second four-way interface, then enters the outdoor heat exchanger to release heat and condense into a high-pressure liquid phase. After throttling and reducing the pressure by the first throttle valve, it flows into the cabin heat exchanger to absorb heat and evaporate, cooling the air inside the cabin. The vaporized refrigerant flows into the suction port of the compressor through the third four-way interface and the fourth four-way interface of the four-way reversing valve.

5. A vehicle air conditioning system control method for providing liquid cooling and liquid heating as claimed in claim 3, characterized in that: The first four-way interface is connected to the fourth four-way interface, and the second four-way interface is connected to the third four-way interface; the three-way valve is closed, the first throttle valve is opened, the second throttle valve is closed, and the stop valve is opened; the high-temperature and high-pressure gaseous refrigerant at the compressor outlet flows in through the first four-way interface of the four-way reversing valve and flows out through the fourth four-way interface, then enters the cabin heat exchanger to condense and release heat to become a high-pressure liquid phase, heating the air inside the cabin, and then after throttling and reducing the pressure through the first throttle valve, flows into the outdoor heat exchanger to absorb heat and evaporate, and the vaporized refrigerant flows into the suction port of the compressor through the second four-way interface and the third interface of the four-way reversing valve.

6. A vehicle air conditioning system control method for providing liquid cooling and liquid heating as claimed in claim 3, characterized in that: The first four-way interface is connected to the second four-way interface, the third four-way interface is connected to the fourth four-way interface, the second three-way interface is connected to the third three-way interface, the first throttle valve is closed, the second throttle valve is opened, and the stop valve is opened; the high-temperature and high-pressure gaseous refrigerant at the compressor outlet flows in from the first four-way interface of the four-way reversing valve, flows out from the second four-way interface, then enters the outdoor heat exchanger to release heat and condense into a high-pressure liquid phase, after throttling and reducing the pressure by the second throttle valve, flows into the plate heat exchanger to absorb heat and evaporate, cools the coolant, and the vaporized refrigerant flows into the suction port of the compressor through the second three-way interface and the third three-way interface of the three-way valve, and the coolant circulation pump works to drive the low-temperature coolant to the cold unit.

7. A vehicle air conditioning system control method for providing liquid cooling and liquid heating as claimed in claim 3, characterized in that: The first four-way interface and the fourth four-way interface of the four-way reversing valve are connected, the second four-way interface and the third four-way interface are connected, the first three-way interface and the third three-way interface are connected, the first throttle valve is closed, the second throttle valve is opened, and the stop valve is opened; the high-temperature and high-pressure gaseous refrigerant at the compressor outlet flows into the plate heat exchanger through the first three-way interface and the third three-way interface to condense and release heat, heating the coolant, and the liquefied refrigerant is throttled and reduced in pressure by the second throttle valve, and then flows into the outdoor heat exchanger to absorb heat and evaporate, and the vaporized refrigerant flows into the suction port of the compressor through the second four-way interface and the third four-way interface, and the coolant circulation pump works to drive the high-temperature coolant to the heat-using unit.

8. A vehicle air conditioning system control method for providing liquid cooling and liquid heating as claimed in claim 3, characterized in that: The first four-way interface and the second four-way interface are connected, the third four-way interface and the fourth four-way interface are connected, the second three-way interface and the third three-way interface are connected, and the first throttle valve, the second throttle valve and the stop valve are all opened; the high-temperature and high-pressure gaseous refrigerant at the compressor outlet flows in through the first four-way interface of the four-way reversing valve, flows out through the second four-way interface, and then enters the outdoor heat exchanger to release heat and condense into a high-pressure liquid phase. One path is throttled and depressurized by the first throttle valve, and then flows into the cabin heat exchanger to absorb heat and evaporate, cooling the air inside the cabin. The vaporized refrigerant flows into the suction port of the compressor through the third four-way interface and the fourth four-way interface of the four-way reversing valve. The other path is throttled and depressurized by the second throttle valve, and then flows into the plate heat exchanger to absorb heat and evaporate, cooling the coolant. The vaporized refrigerant flows into the suction port of the compressor through the second three-way interface and the third three-way interface. The coolant circulation pump works to drive the low-temperature coolant to the cold unit.

9. A vehicle air conditioning system control method for providing liquid cooling and liquid heating as claimed in claim 3, characterized in that: The third four-way interface and the fourth four-way interface are connected, the first three-way interface and the third three-way interface are connected, the first throttle valve and the second throttle valve are opened, and the stop valve is closed; the high-temperature and high-pressure gaseous refrigerant at the compressor outlet flows into the plate heat exchanger through the first three-way interface and the third three-way interface to condense and release heat, heating the coolant, and the liquefied refrigerant is throttled and reduced in pressure by the second throttle valve and the first throttle valve in turn, and then flows into the cabin heat exchanger to absorb heat and evaporate, cooling the air inside the cabin, and the vaporized refrigerant flows into the suction port of the compressor through the third four-way interface and the fourth four-way interface, and the coolant circulation pump works to drive the high-temperature coolant to the heat-using unit.

10. A vehicle air conditioning system control method for providing liquid cooling and liquid heating as claimed in claim 3, characterized in that: The first four-way interface and the fourth four-way interface are connected, the second three-way interface and the third three-way interface are connected, the first throttle valve and the second throttle valve are opened, and the cutoff valve is closed; the high-temperature and high-pressure gaseous refrigerant at the compressor outlet flows into the cabin heat exchanger through the first four-way interface and the fourth four-way interface to condense and release heat to become a high-pressure liquid phase, heating the air inside the cabin, and then throttles and reduces the pressure through the first throttle valve and the second throttle valve in turn, flows into the plate heat exchanger to absorb heat and evaporate, cools the coolant, and the vaporized refrigerant flows into the suction port of the compressor through the second three-way interface and the third three-way interface, the coolant circulation pump works, and drives the low-temperature coolant to the cold unit.

Images