Reversing valve system and air conditioning system including the same

Abstract

The present application provides a reversing valve system and an air conditioning system using the reversing valve system. The reversing valve system includes: a housing having a cavity and at least three openings; a piston capable of reciprocating within the cavity; and a switching device configured to be connected to a control air source. The switching device can cause the piston to remain stationary or reciprocate within the cavity, thereby selectively connecting at least one pair of the at least three openings; wherein the at least three openings are independent of the control air source. The reversing valve system and air conditioning system of the present application, by providing a control air source independent of the housing openings of the reversing valve system, can ensure successful reversal of the reversing valve system even when pressure on the high-pressure side or low-pressure side of the air conditioning system fluctuates.

Description

Technical Field

[0001] The present application relates to the field of air-conditioning systems, and in particular to a reversing valve system in an air-conditioning system. Background Art

[0002] Conventional air conditioning systems include a compressor, a throttling device, and at least two heat exchangers, which together form a refrigerant circulation system. When the refrigerant flows in different directions, it can flow through the at least two heat exchangers in different orders, allowing the air conditioning system to operate in different modes. The air conditioning system also includes a reversing valve system for changing the direction of refrigerant flow. For example, when the reversing valve system is controlled to cause the refrigerant to flow in one direction, the air conditioning system operates in cooling mode. When the reversing valve system is controlled to cause the refrigerant to flow in the opposite direction, the air conditioning system operates in heating mode. Summary of the Invention

[0003] A conventional reversing valve system is pneumatically controlled for reversing direction. This reversing valve system has four openings, which communicate with the compressor suction side, the compressor discharge side, and at least two heat exchangers. By applying a pressure differential to the reversing valve system, the four openings can be connected in pairs in two different ways, thereby changing the refrigerant flow direction.

[0004] However, even when ensuring that the pressure differential provided to the reversing valve system is at least the required value upon activation, existing reversing valve systems can sometimes fail to reverse, requiring the air conditioning system to be shut down for repairs, potentially even requiring refrigerant recovery and piping removal. In some cases, reversing failure can also prevent the oil system from circulating, damaging the compressor.

[0005] In order to solve the above problems, at least one object of the present application is to provide a reversing valve system that can ensure successful reversing of the reversing valve system.

[0006] In order to achieve the above-mentioned objectives, the present application provides a reversing valve system in the first aspect, the reversing valve system comprising: a shell, the shell having a cavity, the shell having at least three openings, the openings being in fluid communication with the cavity, the shell having a relative left end plate and a right end plate; a piston, the piston being installed in the cavity of the shell and capable of reciprocating in the cavity, the reciprocating movement of the piston being capable of selectively communicating with at least one pair of the at least three openings, the piston having a relative first end and a second end, the first end and the second end being configured to match the shape of the cavity so that the first end of the piston A first control chamber is formed between one end of the piston and the left end plate of the shell, and a second control chamber is formed between the second end of the piston and the right end plate of the shell; and a switching device is configured to be connectable to a control air source, and the switching device can selectively connect the control air source with the first control chamber fluid, or connect the control air source with the second control chamber fluid, so that the piston can remain stationary or reciprocate in the cavity of the shell, thereby selectively connecting at least one pair of the at least three openings; wherein, the at least three openings are independent of the control air source.

[0007] According to the first aspect above, the piston is provided with a piston isolation plate between its first end and the second end, and the piston isolation plate divides the space between the piston and the housing into a first chamber and a second chamber, the first chamber is provided with a first partition plate inclined at a first angle, and the second chamber is provided with a second partition plate inclined at a second angle, and the piston isolation plate is configured so that its outer contour matches the shape of the cavity, so that when the piston isolation plate and the four openings are staggered, the first chamber and the second chamber can be isolated from each other; wherein, when the at least three openings are located in the first chamber, the at least three openings are connected to at least one pair of openings in a first manner; when the at least three openings are located in the second chamber, the at least three openings are connected to at least one pair of openings in a second manner.

[0008] According to the above-mentioned first aspect, the at least three openings include four openings, and the reciprocating motion of the piston can selectively connect the four openings in pairs; wherein, when the four openings are located in the first chamber, the four openings form a first type of paired connection; when the four openings are located in the second chamber, the four openings form a second type of paired connection.

[0009] According to the first aspect above, the reversing valve system includes the control air source, and the control air source includes at least one of a high-pressure control air source and a low-pressure control air source; the four openings include a high-pressure connection port and a low-pressure connection port, the high-pressure connection port is used to communicate with the high-pressure side fluid of an air-conditioning system, and the low-pressure connection port is used to communicate with the low-pressure side fluid of the air-conditioning system; the control air source is independent of the high-pressure connection port and the low-pressure connection port.

[0010] According to the first aspect above, the control air source includes a high-pressure control air source, which has an inlet and an outlet; the inlet of the high-pressure control air source is used to controllably fluidically connect with the high-pressure side of the air-conditioning system, and the outlet of the high-pressure control air source is fluidically connected with the switching device.

[0011] According to the first aspect above, the control air source includes a low-pressure control air source, which has an inlet and an outlet; the inlet of the low-pressure control air source is fluidically connected to the switching device, and the outlet of the low-pressure control air source is used to controllably fluidically connect to the low-pressure side of the air-conditioning system.

[0012] According to the first aspect above, the control air source includes a high-pressure control air source and a low-pressure control air source, the high-pressure control air source has an inlet and an outlet, and the low-pressure control air source has an inlet and an outlet; the inlet of the high-pressure control air source is used to be controllably fluidically connected to the high-pressure side of the air-conditioning system, and the outlet of the high-pressure control air source is fluidically connected to the switching device; the inlet of the low-pressure control air source is fluidically connected to the switching device, and the outlet of the low-pressure control air source is used to controllably fluidically connect to the low-pressure side of the air-conditioning system.

[0013] According to the first aspect above, the reversing valve system further includes: a first control valve, through which the inlet of the high-pressure control gas source is controllably fluidically connected to the high-pressure connecting port of the housing.

[0014] According to the first aspect above, the reversing valve system further includes: a second control valve, through which the outlet of the low-pressure control air source is controllably fluidically connected to the low-pressure connection port of the housing.

[0015] According to the first aspect above, the switching device is a four-way pilot valve, which has four pilot valve conducting tubes, and the four pilot valve conducting tubes include a high-pressure conducting tube, a low-pressure conducting tube, a first control conducting tube, and a second control conducting tube; wherein at least one of the high-pressure conducting tube and the low-pressure conducting tube is used to communicate with the control gas source fluid, the first control conducting tube is used to communicate with the first control chamber fluid, and the second control conducting tube is used to communicate with the second control chamber fluid; the four-way pilot valve is controlled by an electromagnetic signal.

[0016] According to the first aspect above, the cavity is cylindrical in shape.

[0017] According to the first aspect above, the control gas source is a closed can-shaped container.

[0018] According to the first aspect above, the control air source is integrated on the housing.

[0019] According to the first aspect above, the control air source has a maintenance port, and the maintenance port is used to controllably connect or disconnect an external air source.

[0020] According to the first aspect above, the control gas source is a closed can-shaped container, which is fixedly connected to at least one of the left end plate and the right end plate of the shell, so that the control gas source and the shell are integrated into a single piece.

[0021] According to the first aspect above, the control gas source is a closed tubular container, which is arranged on the outside of at least one of the four openings of the shell, and a control gas source cavity is formed between the tubular container and the at least one of the four openings, so that the control gas source and the shell are integrated into a single piece.

[0022] In the second aspect, the present application provides an air-conditioning system, which includes: a compressor, a throttling device and at least two heat exchangers, and the air-conditioning system includes a first refrigerant circulation loop and a second refrigerant circulation loop; the air-conditioning system also includes a reversing valve system as described in the first aspect, and the reversing valve system controls the air-conditioning system to connect to the first refrigerant circulation loop or the second refrigerant circulation loop.

[0023] According to the above-mentioned second aspect, the at least two heat exchangers include a first heat exchanger and a second heat exchanger, wherein the compressor, the first heat exchanger, the throttling device and the second heat exchanger are connected in sequence to form a first refrigerant circulation loop, and the compressor, the second heat exchanger, the throttling device and the first heat exchanger are connected in sequence to form a second refrigerant circulation loop; the compressor has an intake end and an exhaust end; the at least three openings of the reversing valve system include a high-pressure connection port, a low-pressure connection port, a first heat exchanger connection port and a second heat exchanger connection port, wherein the high-pressure connection port is fluidly connected to the exhaust end of the compressor, the low-pressure connection port is fluidly connected to the intake end of the compressor, the first heat exchanger connection port is fluidly connected to the first heat exchanger, and the second heat exchanger connection port is fluidly connected to the second heat exchanger; when the piston moves to the first working position, the air-conditioning system is connected to the first refrigerant circulation loop, and when the piston moves to the second working position, the air-conditioning system is connected to the second refrigerant circulation loop.

[0024] According to the above-mentioned second aspect, the at least two heat exchangers include a first heat exchanger, a second heat exchanger and a third heat exchanger, wherein the compressor, the first heat exchanger, the throttling device and the second heat exchanger are connected in sequence to form a first refrigerant circulation loop, and the compressor, the third heat exchanger, the throttling device and the second heat exchanger are connected in sequence to form a second refrigerant circulation loop; the compressor has an intake end and an exhaust end; the at least three openings of the reversing valve system include a high-pressure connection port, a first heat exchanger connection port and a third heat exchanger connection port, wherein the high-pressure connection port is fluidly connected to the exhaust end of the compressor, the first heat exchanger connection port is fluidly connected to the first heat exchanger, and the third heat exchanger connection port is fluidly connected to the third heat exchanger; when the piston moves to the first working position, the air-conditioning system is connected to the first refrigerant circulation loop, and when the piston moves to the second working position, the air-conditioning system is connected to the second refrigerant circulation loop.

[0025] According to the above-mentioned second aspect, the air-conditioning system includes the control air source, the control air source includes a high-pressure control air source, the high-pressure control air source has an inlet and an outlet, the inlet of the high-pressure control air source is controllably fluidically connected to the exhaust end of the compressor, and the outlet of the high-pressure control air source is fluidically connected to the switching device.

[0026] According to the second aspect above, the air-conditioning system includes the control air source, the control air source includes a low-pressure control air source, the low-pressure control air source has an inlet and an outlet, the inlet of the low-pressure control air source is fluidically connected to the switching device, and the outlet of the low-pressure control air source is controllably fluidically connected to the suction end of the compressor.

[0027] According to the above-mentioned second aspect, the high-pressure control gas source includes a medium-pressure tank, which has a gas inlet, a gas outlet and a liquid outlet; wherein, the gas inlet of the medium-pressure tank is controllably fluidly connected to the exhaust end of the compressor, the gas outlet of the medium-pressure tank is fluidly connected to the switching device, and the liquid outlet of the medium-pressure tank is controllably fluidly connected to the outlet side of the throttling device of the air-conditioning system.

[0028] According to the second aspect above, the high-pressure control air source includes an oil storage tank, the oil storage tank has an inlet, a gas outlet and an oil outlet, and the compressor has an oil outlet and an oil return port; wherein, the inlet of the oil storage tank is controllably fluidically connected to the oil outlet of the compressor, the gas outlet of the oil storage tank is fluidically connected to the switching device, and the oil outlet of the oil storage tank is controllably fluidically connected to the oil return port of the compressor.

[0029] The reversing valve system and air-conditioning system of the present application are provided with a control air source independent of the shell opening of the reversing valve system, so that even if the pressure in the high-pressure side or the low-pressure side of the air-conditioning system fluctuates, it will not directly affect the control chamber in the reversing valve system and the pressure difference provided by the switching device, so that the piston can move to the specified position, thereby ensuring the successful reversing of the reversing valve system. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1A A structural block diagram of an embodiment of the air conditioning system of the present application;

[0031] Figure 1B and 1C for Figure 1A Structural block diagram of two refrigerant circulation loops of the air conditioning system;

[0032] Figures 2A-2C for Figure 1A A structural block diagram of an embodiment of the reversing valve system;

[0033] Figures 3A-3C for Figure 2A A three-dimensional structural diagram of a specific embodiment of the reversing valve system;

[0034] Figures 4A-4B for Figure 3A A schematic diagram of the specific structure of the switch device;

[0035] Figure 5 To include Figure 2A A structural block diagram of another embodiment of an air conditioning system of a reversing valve system;

[0036] Figure 6 To include Figure 2AA structural block diagram of another embodiment of an air conditioning system of a reversing valve system;

[0037] Figure 7 for Figure 2A A three-dimensional structural diagram of a specific embodiment of a high-pressure control gas source in a reversing valve system;

[0038] Figure 8A and Figure 8B Based on Figure 2A A three-dimensional structural diagram of another specific embodiment of the reversing valve system;

[0039] Figure 9 Based on Figure 2A A three-dimensional structural diagram of another specific embodiment of the reversing valve system;

[0040] Figure 10 Based on Figure 2A A three-dimensional structural diagram of another specific embodiment of the reversing valve system;

[0041] Figure 11 Based on Figure 2A A three-dimensional structural diagram of another specific embodiment of the reversing valve system;

[0042] Figure 12 Based on Figure 2A A three-dimensional structural diagram of another specific embodiment of the reversing valve system;

[0043] Figures 13A-13C This is a structural block diagram of another specific embodiment of the air-conditioning system of the present application. DETAILED DESCRIPTION

[0044] Various specific embodiments of the present application will be described below with reference to the accompanying drawings that form a part of this specification. It should be understood that although directional terms such as "front," "rear," "upper," "lower," "left," "right," "top," "bottom," and "side" are used in this application to describe various example structural parts and elements of the present application, these terms are used herein for convenience of description only and are determined based on the example orientations shown in the accompanying drawings. Because the embodiments disclosed in this application can be arranged in different orientations, these directional terms are intended to be illustrative only and should not be considered as limiting.

[0045] Figures 1A-1C FIG1 shows a structural block diagram of an embodiment of the air conditioning system of the present application, which is used to illustrate the connection relationship of the reversing valve system 100 in the air conditioning system 150. Figure 1A shows the connection structure of the air conditioning system 150, Figure 1B and Figure 1C Two refrigerant circulation circuits 160 and 170 of the air conditioning system 150 are shown respectively, wherein Figure 1B shows the refrigerant circulation circuit 160 in cooling mode, Figure 1C The refrigerant circulation circuit 170 is shown in the heating mode.

[0046] like Figure 1A As shown, the air conditioning system 150 includes a compressor 151, a first heat exchanger 153, a second heat exchanger 154 and a throttling device 152, which are connected to form a closed system through pipelines and filled with refrigerant. The air conditioning system 150 also includes a reversing valve system 100, which can control the air conditioning system 150 to communicate with the following: Figure 1B The refrigerant circulation circuit 160 shown is connected to Figure 1C A refrigerant circulation circuit 170 is shown.

[0047] like Figure 1A As shown, the compressor 151 includes an exhaust end 151a and an intake end 151b, the first heat exchanger 153 includes connection ports 153a and 153b, the second heat exchanger 154 includes connection ports 154a and 154b, and the throttling device 152 includes connection ports 152a and 152b. In this embodiment, the reversing valve system 100 is a four-way reversing valve, including a high-pressure connection port 111, a low-pressure connection port 112, a first heat exchanger connection port 113 and a second heat exchanger connection port 114. These components are connected by pipes in the following manner to achieve fluid communication: the high-pressure connection port 111 of the reversing valve system 100 is connected to the discharge end 151a of the compressor 151, the low-pressure connection port 112 of the reversing valve system 100 is connected to the suction end 151b of the compressor 151, the first heat exchanger connection port 113 of the reversing valve system 100 is connected to the connection port 153b of the first heat exchanger 153, and the second heat exchanger connection port 114 of the reversing valve system 100 is connected to the connection port 154b of the second heat exchanger 154. Furthermore, the connection port 153a of the first heat exchanger 153 is connected to the connection port 152a of the throttling device 152, and the connection port 152b of the throttling device 152 is connected to the connection port 154a of the second heat exchanger 154. As an example, the first heat exchanger 153 is an air-side heat exchanger, and the second heat exchanger 154 is a water-side heat exchanger. The second heat exchanger 154 is used to connect to the supply and return water pipes, so that the second heat exchanger 154 can provide the heat or cooling required by the user side when working.

[0048] In addition, the reversing valve system 100 also includes a switch device 103 and a control gas source, which includes a high-pressure control gas source 120 and a low-pressure control gas source 121. It should be noted that in the embodiments of the present application, the high-pressure control gas source 120 and the low-pressure control gas source 121 merely represent the controlled high or low pressures, and do not represent actual gases. As an example, the high-pressure control gas source 120 can be a container containing high-pressure gas refrigerant to maintain a high pressure; the low-pressure control gas source 121 can be a container with a cavity, which has a low pressure and receives pressure or gas refrigerant discharged from the outside. Specifically, both the high-pressure control gas source 120 and the low-pressure control gas source 121 can include tank-shaped containers. The high-pressure control gas source 120 can be a high-pressure energy storage tank for storing high-pressure gas refrigerant, and the low-pressure control gas source 121 can be a low-pressure surge tank for receiving pressure or gas refrigerant to maintain a stable pressure. When the high-pressure control gas source 120 and the low-pressure control gas source 121 contain refrigerant in gaseous form, in order to prevent the refrigerant from condensing from gaseous state to liquid state and affecting the normal operation of the pneumatic reversing valve system 100, an insulation layer can be further provided outside the high-pressure control gas source 120 and the low-pressure control gas source 121 to keep the high-pressure control gas source 120 and the low-pressure control gas source 121 warm, for example Figure 10 Insulation cotton 1082 and Figure 11 Insulation cotton 1182.

[0049] The switch device 103 includes a high-pressure conducting pipe 125, a low-pressure conducting pipe 126, and control conducting pipes 127 and 128. The high-pressure control air source 120 includes an inlet 120a and an outlet 120b, and the low-pressure control air source 121 includes an inlet 121a and an outlet 121b. These components are connected by pipelines in the following manner to achieve fluid communication: the inlet 120a of the high-pressure control air source 120 is controllably connected to the exhaust port 151a of the compressor 151, and the high-pressure conducting pipe 125 of the switch device 103 is connected to the outlet 120b of the high-pressure control air source 120. Thus, the high-pressure conducting pipe 125 of the switch device 103 is controllably connected to the exhaust port 151a of the compressor 151 via the high-pressure control air source 120. The low-pressure conducting pipe 126 of the switch device 103 is connected to the inlet 121a of the low-pressure control air source 121, and the outlet 121b of the low-pressure control air source 121 is controllably connected to the suction end 151b of the compressor 151. Thus, the low-pressure conducting pipe 126 of the switch device 103 is controllably connected to the suction end 151b of the compressor 151 via the low-pressure control air source 121. The control conducting pipes 127 and 128 of the switch device 103 are connected to the control chambers 204 and 205 in the reversing valve system 100 (see Figures 2A-2C ).

[0050] Specifically, the air conditioning system 150 further includes a first control valve 157 and a second control valve 158. As an example, the first control valve 157 and the second control valve 158 are one-way control valves, each having an inlet and an outlet, and fluid flowing through them flows unidirectionally from the inlet to the outlet. The inlet of the first control valve 157 is connected to the discharge port 151a of the compressor 151, and the outlet of the first control valve 157 is connected to the inlet 120a of the high-pressure control air source 120. The inlet of the second control valve 158 is connected to the outlet 121b of the low-pressure control air source 121, and the outlet of the second control valve 158 is connected to the intake port 151b of the compressor 151. Thus, first control valve 157 allows refrigerant to flow into high-pressure control air source 120 but prevents it from flowing out, maintaining a high pressure in high-pressure control air source 120 for a certain period of time. Second control valve 158 allows refrigerant from low-pressure control air source 121 to flow out but prevents it from flowing into low-pressure control air source 121, maintaining a low pressure in low-pressure control air source 121 for a certain period of time. The pressure difference between high-pressure control air source 120 and low-pressure control air source 121 is maintained for a certain period of time, ensuring smooth reversal of the reversing valve system.

[0051] In other embodiments, the inlet of the first control valve 157 may also be connected to another location on the high-pressure side of the air-conditioning system, or may not be connected to the air-conditioning system, but may be connected to another high-pressure control air source outside the air-conditioning system, such as another refrigerant gas compression tank. Similarly, the outlet of the second control valve 158 may also be connected to another location on the low-pressure side of the air-conditioning system, or may not be connected to the air-conditioning system, but may be connected to another low-pressure control air source outside the air-conditioning system, such as a low-pressure gas tank.

[0052] As a result, the high-pressure control air source 120 and the low-pressure control air source 121 are not directly connected to the high-pressure side or the low-pressure side of the air conditioning system, and are therefore also separated from or not directly connected to the four connection ports (i.e., four openings) 111, 112, 113, and 114 of the reversing valve system 100. This makes the high-pressure control air source 120 and the low-pressure control air source 121 independent of the four connection ports 111, 112, 113, and 114 of the reversing valve system 100. Through the switching device 103, the pressures of the high-pressure control air source 120 and the low-pressure control air source 121 are introduced into the control chambers 204 and 205 of the reversing valve system 100, thereby providing a pressure differential between the control chambers 204 and 205 of the reversing valve system 100. Fluctuations in the pressure on the high-pressure side or the low-pressure side of the air conditioning system do not directly affect the pressure differential provided by the switching device 103 to the control chambers 204 and 205 of the reversing valve system 100.

[0053] As an example, by controlling the diameter of the connecting pipe between the inlet 120a of the high-pressure control air source 120 and the exhaust end 151a of the compressor 151, it is possible to ensure that only a small amount of the high-pressure gas refrigerant discharged from the exhaust end 151a of the compressor 151 flows into the high-pressure control air source 120 through the inlet 120a of the high-pressure control air source 120, thereby providing a pressure difference between the control chambers 204 and 205. The majority of the high-pressure gas refrigerant, after passing through the reversing valve system 100, flows into the first heat exchanger 153 or the second heat exchanger 154, thereby participating in the refrigerant circulation circuit of the air-conditioning system 150. Therefore, although the present application provides a high-pressure control air source 120 that is separately connected to the high-pressure side of the air-conditioning system and a low-pressure control air source 121 that is separately connected to the low-pressure side of the air-conditioning system, this does not affect the refrigerant circulation of the air-conditioning system 150.

[0054] It should be noted that in certain embodiments of the present application, the control air source may include only one of the high-pressure control air source 120 and the low-pressure control air source 121. When the control air source includes only the high-pressure control air source 120, the low-pressure conduction pipe 126 of the switch device 103 is directly connected to the intake port 151b of the compressor 151. When the control air source includes only the low-pressure control air source 121, the high-pressure conduction pipe 125 of the switch device 103 is directly connected to the exhaust port 151a of the compressor 151.

[0055] The switch device 103 connects the high-pressure control air source 120 to one of the control chambers 204 and 205, and connects the low-pressure control air source 121 to the other of the control chambers 204 and 205, so that the four connection ports 111, 112, 113, and 114 of the reversing valve system 100 are connected in pairs, thereby controlling the air conditioning system 150 to be connected. Figure 1B The refrigerant circulation circuit 160 shown is connected to Figure 1C The refrigerant circulation circuit 170 shown in FIG. Among them, the switch device 103 controls the four connection ports 111, 112, 113, 114 of the reversing valve system 100 to be connected in pairs. Figures 2A-2C Provide detailed explanation.

[0056] like Figure 1BAs shown, the four connection ports 111, 112, 113, and 114 of the reversing valve system 100 are connected in pairs in a first manner, i.e., the high-pressure connection port 111 of the reversing valve system 100 is fluidically connected to the first heat exchanger connection port 113 of the reversing valve system 100, and the low-pressure connection port 112 of the reversing valve system 100 is fluidically connected to the second heat exchanger connection port 114 of the reversing valve system 100. At this time, the high-pressure gas refrigerant discharged from the discharge port 151a of the compressor 151 flows into the first heat exchanger 153, where it releases heat and is condensed into high-pressure liquid refrigerant. The refrigerant then flows into the throttling device 152, where it is throttled to low-pressure liquid refrigerant, and then flows into the second heat exchanger 154, where it absorbs heat and evaporates into low-pressure gas refrigerant. The refrigerant finally flows into the suction port 151b of the compressor 151, completing the refrigerant cycle. At this time, the second heat exchanger 154 absorbs heat from the user side, so it can cool the outside, and the air-conditioning system is in cooling mode.

[0057] Among them, in the cooling mode, the refrigerant flowing between the exhaust end 151a of the compressor 151 through the first heat exchanger 153 to the connecting port 152a of the throttling device 152 (i.e., the high-pressure side of the air-conditioning system) is all high-pressure refrigerant, and the refrigerant flowing between the connecting port 152b of the throttling device 152 through the second heat exchanger 154 to the suction end 151b of the compressor 151 (i.e., the low-pressure side of the air-conditioning system) is all low-pressure refrigerant.

[0058] like Figure 1C As shown, the four connection ports 111, 112, 113, and 114 of the reversing valve system 100 are connected in pairs in a second manner, i.e., the high-pressure connection port 111 of the reversing valve system 100 is fluidically connected to the second heat exchanger connection port 114 of the reversing valve system 100, and the low-pressure connection port 112 of the reversing valve system 100 is fluidically connected to the first heat exchanger connection port 113 of the reversing valve system 100. At this time, the high-pressure gas refrigerant discharged from the discharge port 151a of the compressor 151 flows into the second heat exchanger 154, where it releases heat and is condensed into high-pressure liquid refrigerant. The refrigerant then flows into the throttling device 152, where it is throttled to low-pressure liquid refrigerant, and then flows into the first heat exchanger 153, where it absorbs heat and evaporates into low-pressure gas refrigerant. The refrigerant finally flows into the suction port 151b of the compressor 151, completing the refrigerant cycle. At this time, the second heat exchanger 154 releases heat to the user side, so it can heat the outside, and the air-conditioning system is in heating mode.

[0059] Among them, in the heating mode, the refrigerant flowing between the exhaust end 151a of the compressor 151 through the second heat exchanger 154 to the connecting port 152b of the throttling device 152 (i.e., the high-pressure side of the air-conditioning system) is all high-pressure refrigerant, and the refrigerant flowing between the connecting port 152a of the throttling device 152 through the first heat exchanger 153 to the suction end 151b of the compressor 151 (i.e., the low-pressure side of the air-conditioning system) is all low-pressure refrigerant.

[0060] Figures 2A-2C for Figure 1A The structure block diagram of an embodiment of the reversing valve system 100 is used to illustrate the working principle of the reversing valve system 100. The dotted line represents the housing 201. Figure 2A 、 Figure 2B and Figure 2C The piston 202 is located at different positions relative to the housing 201. Figure 2A The piston 202 is in the middle position, which is used to illustrate the positional relationship between the piston and the four connecting ports when the four connecting ports are connected to each other; Figure 2B The piston 202 is at the rightmost end, which is used to illustrate the positional relationship between the piston and the four connecting ports when the four connecting ports are connected in pairs in the first manner; Figure 2C The piston 202 is at the far left end, which is used to illustrate the positional relationship between the piston and the four connecting ports when the four connecting ports are connected in pairs in the second manner.

[0061] like Figures 2A-2C As shown, the reversing valve system 100 includes a housing 201 , a piston 202 and a switch device 103 , wherein the piston 202 reciprocates in the housing 201 , and the switch device 103 is used to control the movement of the piston 102 in the housing 101 .

[0062] Specifically, the housing 201 is generally cylindrical or square, with both ends closed. It contains a chamber 210, with a left end plate 207 and a right end plate 208 at either end. The piston 202 is disposed within the chamber 210 and moves linearly within the chamber 210 to the left end plate 207 or the right end plate 208. The four connection ports 111, 112, 113, and 114 of the reversing valve system 100 are disposed in pairs, circumferentially, in the middle of the housing 201. In the illustrated embodiment, the high-pressure connection port 111 and the low-pressure connection port 112 of the reversing valve system 100 are disposed oppositely on the upper and lower sides of the housing 201, while the first heat exchanger connection port 113 and the second heat exchanger connection port 114 are disposed oppositely on the front and rear sides of the housing 201.

[0063] The piston 202 includes a left end 217 (i.e., the first end) and a right end 218 (i.e., the second end), wherein the shapes or outer contours of the left end 217 and the right end 218 of the piston 202 are roughly the same as or match the shape of the cavity 210 of the housing 201, so that a roughly closed first control chamber 204 can be formed between the left end 217 of the piston 202 and the left end plate 207 of the housing 201, and a roughly closed second control chamber 205 can be formed between the right end 218 of the piston 202 and the right end plate 208 of the housing 201. When the switch device 103 controls the high-pressure control air source 120 and the low-pressure control air source 121 to communicate with the control conduits 127 and 128, the switch device 103 can connect the high-pressure control air source 120 to one of the first control chamber 204 and the second control chamber 205, and connect the low-pressure control air source 121 to the other of the first control chamber 204 and the second control chamber 205, thereby creating a pressure differential between the first control chamber 204 and the second control chamber 205. At this point, the pressure differential can maintain the piston 202 in its current position, or the control chamber with higher pressure can control the piston 202 to move toward the control chamber with lower pressure until the end of the piston 202 (e.g., the left end 217 or the right end 218) contacts the end plate of the housing 201 (e.g., the left end plate 207 or the right end plate 208).

[0064] The piston 202 also includes a piston isolation plate 231, which is disposed between the left end 217 and the right end 218, and divides the space between the piston 202 and the housing 201 into a first chamber 235 and a second chamber 236. That is, the space enclosed between the portion between the left end 217 and the right end 218 of the piston 202 and the middle portion of the housing 201 is divided into the first chamber 235 and the second chamber 236. The piston isolation plate 231 reciprocates with the piston 202, so that the four connection ports 111, 112, 113, and 114 of the reversing valve system 100 can be respectively located in the first chamber 235 or the second chamber 236 (i.e., respectively connected to the first chamber 235 or the second chamber 236). The shape of the piston isolation plate 231 is also roughly the same as or matches the shape of the cavity 210 of the housing 201 (i.e., the shape of the cross section of the cavity 210), so that when the piston 202 is in a position such as Figure 2B and 2C When the piston 202 is in the position shown, the piston isolation plate 231 is staggered with the four connection ports 111, 112, 113, 114 of the reversing valve system 100, and the first chamber 235 and the second chamber 236 are isolated from each other. Figure 2AIn the position shown, the piston isolation plate 231 is not offset from the four connection ports 111, 112, 113, and 114 of the reversing valve system 100, and the first chamber 235 and the second chamber 236 are interconnected through the four connection ports 111, 112, 113, and 114 of the reversing valve system 100. That is, the four connection ports 111, 112, 113, and 114 of the reversing valve system 100 are also interconnected. At this time, the high-pressure side of the air conditioning system connected to the high-pressure connection port 111 of the reversing valve system and the low-pressure side of the air conditioning system connected to the low-pressure connection port 112 of the reversing valve system are also interconnected, so that the pressures on the high-pressure side and the low-pressure side of the air conditioning system are quickly balanced, that is, the pressure in the pipeline on the high-pressure side of the air conditioning system quickly decreases, while the pressure in the pipeline on the low-pressure side of the air conditioning system quickly increases.

[0065] Furthermore, a first partition plate 337 inclined at a first angle is provided in the first chamber 235 (see Figure 3A The first partition plate 337 in the second chamber 236 is provided with a second partition plate 338 inclined at a second angle (see Figure 3A The first partition plate 337 and the second partition plate 338 are used to separate the first chamber 235 and the second chamber 236 respectively, so as to selectively connect the four connection ports 111, 112, 113, and 114 of the reversing valve system 100 in pairs. The specific method of connecting the four connection ports by the first partition plate 337 and the second partition plate 338 will be described below in conjunction with Figures 3A-3C Detailed description.

[0066] The switch device 103 includes four conducting tubes 125, 126, 127 and 128, namely the first control conducting tube 127, the second control conducting tube 128, the high-pressure conducting tube 125 and the low-pressure conducting tube 126, wherein the first control conducting tube 127 is connected to the first control chamber 204, the second control conducting tube 128 is connected to the second control chamber 205, the high-pressure conducting tube 125 is used to connect to the high-pressure control gas source 120, and the low-pressure conducting tube 126 is used to connect to the low-pressure control gas source 121.

[0067] like Figure 2B As shown, the switch device 103 controls the high-pressure control air source 120 to communicate with the first control chamber 204 through the first control conduit 127, and controls the low-pressure control air source 121 to communicate with the second control chamber 205 through the second control conduit 128. At this time, the pressure in the first control chamber 204 is greater than the pressure in the second control chamber 205, and the piston 202 moves to the rightmost end (i.e., the first working position). The four connection ports 111, 112, 113, and 114 of the reversing valve system 100 are located in the first chamber 235. The first partition 337 in the first chamber 235 (not shown in the figure, see Figures 3A-3C) The four connecting ports 111, 112, 113, 114 are connected in pairs in the first manner. The piston isolation plate 231 is staggered with the four connecting ports 111, 112, 113, 114, so that the first chamber 235 and the second chamber 236 are sealed from each other.

[0068] At this time, the reversing valve system 100 is connected to the air conditioning system 150. Figure 1B In the illustrated circulation loop 160 , the air conditioning system is in cooling mode.

[0069] like Figure 2C As shown, the switch device 103 controls the low-pressure control air source 121 to communicate with the first control chamber 204 through the first control conduit 127, and controls the high-pressure control air source 120 to communicate with the second control chamber 205 through the second control conduit 128. At this time, the pressure in the second control chamber 205 is greater than the pressure in the first control chamber 204, and the piston 202 moves to the leftmost end (i.e., the second working position). The four connection ports 111, 112, 113, and 114 of the reversing valve system 100 are located in the second chamber 236. The second partition 338 in the second chamber 236 (not shown in the figure, see Figures 3A-3C ) The four connecting ports 111, 112, 113, 114 are connected in pairs in the second manner. At this time, the piston isolation plate 231 is staggered with the four connecting ports 111, 112, 113, 114, so that the first chamber 235 and the second chamber 236 are sealed from each other.

[0070] At this time, the reversing valve system 100 is connected to the air conditioning system 150. Figure 1C In the illustrated circulation loop 170 , the air conditioning system is in heating mode.

[0071] It is worth noting that when the air conditioning system switches from cooling mode to heating mode, or from heating mode to cooling mode, the piston 202 will be Figure 2B The rightmost end shown is as follows Figure 2C The leftmost movement shown, or from Figure 2C The leftmost end shown is as follows Figure 2B In both movements, the piston 202 will pass through the Figure 2A If the air conditioning system does not include the high-pressure control air source 120 and the low-pressure control air source 121 of the present application, but directly connects the high-pressure conducting pipe 125 of the switch device 103 to the high-pressure side of the air conditioning system, and connects the low-pressure conducting pipe 126 of the switch device 103 to the low-pressure side of the air conditioning system, and controls the high-pressure side and the low-pressure side of the air conditioning system to communicate with the first control chamber 204 and the second control chamber 205, then even if the pressure difference between the first control chamber 204 and the second control chamber 205 is sufficient to make the piston 202 move from one end to the other end, it will also be due to the passage of Figure 2A At the position shown, the pressures on the high-pressure side and the low-pressure side of the air-conditioning system are quickly balanced, and the switch device 103 cannot provide enough pressure difference to maintain the movement of the piston 202, which may cause the piston 202 to stay in the position shown. Figure 2A The position shown cannot move further, which will cause the air conditioning system to fail to reversing.

[0072] The reversing valve system and air-conditioning system of the present application are provided with a high-pressure control air source 120 and a low-pressure control air source 120 independent of the four connection ports, so that even if the pressure in the high-pressure side or the low-pressure side of the air-conditioning system fluctuates, it will not directly affect the pressure difference provided by the switching device 103 to the control chambers 204 and 205 in the reversing valve system 100, so that the piston 202 can move to the specified position, ensuring the successful reversing of the reversing valve system.

[0073] Specifically, combined Figures 1A-1C For example, when the air-conditioning system is operating in heating or cooling mode, the high-pressure control air source 120 is connected to the high-pressure side of the air-conditioning system to maintain a higher pressure, and the low-pressure control air source 121 is connected to the low-pressure side of the air-conditioning system to maintain a lower pressure, and the piston 202 can be maintained in the current position and remain motionless.

[0074] When the air conditioning system switches from cooling mode to heating mode, or switches from heating mode to cooling mode, the reversing valve system 100 has similar actions. The following is a specific description of the switching of the air conditioning system from cooling mode to heating mode.

[0075] When the air conditioning system switches from cooling mode to heating mode, the switch device 103 receives an electromagnetic signal. The switch device 103 switches from connecting the high-pressure control air source 120 and the first control chamber 204 to connecting the high-pressure control air source 120 and the second control chamber 205, and at the same time switches the connection between the low-pressure control air source 121 and the second control chamber 205 to connecting the low-pressure control air source 121 and the first control chamber 204. At this time, the pressure or gas refrigerant in the first control chamber 204 is discharged into the low-pressure control air source 121 through the switch device 103, so that the pressure in the first control chamber 204 is reduced; and the high-pressure gas refrigerant in the high-pressure control air source 120 is discharged into the second control chamber 205 through the switch device 103, so that the pressure in the second control chamber 205 is increased. The pressure difference between the first control chamber 204 and the second control chamber 205 pushes the piston 202 from Figure 2B It should be noted that at this time, the pressure on the high-pressure side of the air conditioning system is greater than the pressure of the high-pressure control air source 120 (i.e., the pressure of the second control chamber 205), and the first control valve 157 remains open, and similarly, the second control valve 158 also remains open.

[0076] When the piston 202 moves to Figure 2A In the intermediate position shown, the four connection ports 111, 112, 113, and 114 are interconnected via the first chamber 235 and the second chamber 236, causing the pressure in the high-pressure connection port 111 to rapidly decrease while the pressure in the low-pressure connection port 112 to rapidly increase. Consequently, the pressure on the high-pressure side of the air conditioning system rapidly decreases while the pressure on the low-pressure side of the air conditioning system rapidly increases. When the pressure on the high-pressure side of the air conditioning system decreases below the pressure of the high-pressure control air source 120, the first control valve 157 closes, maintaining a higher pressure in the high-pressure control air source 120, thereby allowing the second control chamber 205 to also have a higher pressure. Similarly, when the pressure on the low-pressure side of the air conditioning system increases above the pressure of the low-pressure control air source 121, the second control valve 158 closes, maintaining a lower pressure in the low-pressure control air source 121, thereby allowing the first control chamber 204 to also have a lower pressure. The first control chamber 204 and the second control chamber 205 can continue to maintain the pressure difference, so that the piston 202 can continue to move to the left until the piston isolation plate 231 is staggered with the four connection ports, and the piston 202 reaches the position as shown in FIG. Figure 2C The far left end is shown, causing the air conditioning system to switch to heating mode.

[0077] Figures 3A-3C for Figure 2A The three-dimensional structure diagram of a specific embodiment of the reversing valve system is used to illustrate the specific way in which the first partition 337 and the second partition 338 of the piston 202 are connected in pairs to the four connecting ports on the housing. Figure 3B 3C and 3D are cross-sectional views of the piston 202 and the four connection ports on the housing at two different positions along both sides of the piston isolation plate 331, wherein Figure 3B It is used to illustrate the specific way in which the first partition 337 connects the four connection ports. Figure 3C It is used to illustrate the specific way in which the second partition 338 connects the four connection ports.

[0078] like Figure 3A As shown, the housing 301 is Figures 2A-2C The specific structure of an embodiment of a reversing valve system in FIG. To illustrate the piston 302 within the housing 301, the housing 301 and four connection ports connected to the housing 301 are indicated by dashed lines. The reversing valve system includes a housing 301, with a left end plate 307 disposed on the left side and a right end plate 308 disposed on the right side. The housing 301 defines a cavity 310. Four connection ports 311, 312, 313, and 314 are disposed in the central portion of the housing 301 at 90° intervals along the circumference. The high-pressure connection port 311 and the low-pressure connection port 312 are disposed oppositely on the upper and lower sides of the housing 301, while the first heat exchanger connection port 313 and the second heat exchanger connection port 314 are disposed oppositely on the front and rear sides of the housing 301.

[0079] The piston 302 is disposed in the chamber 310 and moves linearly left and right within the chamber 310. The piston 302 has a left end 317 and a right end 318. A first control chamber 304 is formed between the left end 317 and the left end plate 307 of the housing, and a second control chamber 305 is formed between the right end 318 and the right end plate 308 of the housing. The central portion of the piston 302 includes a piston isolation plate 331. A first chamber 335 is formed between the left end 317 and the isolation plate 331, and a second chamber 336 is formed between the right end 318 and the isolation plate 331. A first isolation plate 337 is provided in the first chamber 335, tilted backward from top to bottom. A second isolation plate 338 is provided in the second chamber 336, tilted forward from top to bottom. As an example, the first isolation plate 337 and the second isolation plate 338 are disposed perpendicularly to each other.

[0080] The reversing valve system also includes a switching device, which in this embodiment is a four-way pilot valve 303. As an example, the four-way pilot valve 303 is fixedly connected to the exterior of the housing 301, for example, by welding. The four-way pilot valve 303 has four conduits 325, 326, 327, and 328. The first control conduit 327 communicates with the first control chamber 304, and the second control conduit 328 communicates with the second control chamber 305. The high-pressure conduit 325 is connected to the high-pressure control air source 120, and the low-pressure conduit 326 is connected to the low-pressure control air source 121. When the four-way pilot valve 303 connects the high-pressure control air source 120 and the low-pressure control air source 121 to the first control chamber 304 or the second control chamber 305, respectively, a pressure difference exists between the first control chamber 304 and the second control chamber 305, causing the piston 302 to move left and right along a straight line within the chamber 310.

[0081] Figure 3B Shown Figure 3A The cross-sectional view along line AA is used to illustrate that the first partition 337 in the first chamber 335 connects the four connection ports 311, 312, 313 and 314 in pairs in a first manner; Figure 3C Shown Figure 3A The cross-sectional view along line BB is used to illustrate that the second partition plate 338 in the second chamber 336 connects the four connection ports 311 , 312 , 313 and 314 in pairs in a second manner.

[0082] like Figure 3B As shown, four connection ports 311 , 312 , 313 and 314 are in communication with the first chamber 335 , the high-pressure connection port 311 is in communication with the first heat exchanger connection port 313 , and the low-pressure connection port 312 is in communication with the second heat exchanger connection port 314 .

[0083] like Figure 3CAs shown, the four connection ports 311 , 312 , 313 and 314 are also in communication with the second chamber 336 , the high-pressure connection port 311 is in communication with the second heat exchanger connection port 314 , and the low-pressure connection port 312 is in communication with the first heat exchanger connection port 313 .

[0084] Therefore, in Figure 3A In the state shown, the high-pressure connection port 311 is connected to the first heat exchanger connection port 313 and the second heat exchanger connection port 314, and the low-pressure connection port 312 is connected to the first heat exchanger connection port 313 and the second heat exchanger connection port 314, so that the four connection ports 311, 312, 313 and 314 are connected to each other.

[0085] Figure 4A and 4B for Figure 3A The specific structure diagram of the switch device in the embodiment of the present invention shows the specific structure of the four-way pilot valve 303, so as to illustrate the specific structure of the four-way pilot valve 303 providing a pressure difference between the first chamber and the second chamber to control the piston movement in the reversing valve system. In order to illustrate the internal structure of the four-way pilot valve 303, Figure 4A and 4B It is shown in a cross-sectional view. Figure 4A and 4B The electromagnetic control part of the structure is omitted, and only the valve body part of the four-way pilot valve 303 is shown.

[0086] like Figure 4A and 4B As shown, the four-way pilot valve 303 has a shell 441, and four conducting pipes 325, 326, 327 and 328 are connected to the shell 441, wherein the high-pressure conducting pipe 325 is arranged at the upper part of the shell 441, and the low-pressure conducting pipe 326, the first control conducting pipe 327 and the second control conducting pipe 328 are arranged side by side at the lower part of the shell 441.

[0087] The housing 441 also includes a piston rod 442. The piston rod 442 can move left and right inside the housing 441 after being driven by an electromagnetic signal (not shown in the figure). Figure 4A The piston rod 442 is shown in the rightmost position. Figure 4B The piston rod 442 is shown in the leftmost position. The piston rod 442 has a piston chamber 445 therein, which is in communication with the high-pressure conduit 325. When the piston rod 442 is in different positions, the piston chamber 445 can also be in communication with one of the first control conduit 327 or the second control conduit 328.

[0088] The piston chamber 445 includes an upwardly arched cover 448, which divides the piston chamber 445 into two channels 446 and 449: one inside the cover 448 and the other outside the cover 448. The channel 446 inside the cover 448 can connect the low-pressure conductive tube 326 with either the first control conductive tube 327 or the second control conductive tube 328, while the channel 449 outside the cover 448 can connect the high-pressure conductive tube 325 with the other of the first control conductive tube 327 or the second control conductive tube 328.

[0089] The four-way pilot valve 303 is Figure 4A In the state shown, the low-pressure conducting pipe 326 and the second control conducting pipe 328 are connected through the channel 446, and the high-pressure conducting pipe 325 and the first control conducting pipe 327 are connected through the channel 449; Figure 4B In the illustrated state, the low-pressure conductive tube 326 and the first control conductive tube 327 are in communication through the passage 446 , and the high-pressure conductive tube 325 and the second control conductive tube 328 are in communication through the passage 449 .

[0090] Thus, the four-way pilot valve 303 can selectively connect the high-pressure control air source 120 to one of the first control chamber 204 and the second control chamber 205 , and connect the low-pressure control air source 121 to the other of the first control chamber 204 and the second control chamber 205 .

[0091] Figure 5 Including Figure 2A The structural block diagram of another embodiment of the air conditioning system of the reversing valve system in this embodiment is also a four-way reversing valve. Figure 5 In the embodiment shown, the high pressure control gas source comprises a medium pressure tank 520. Figure 5 In the illustrated embodiment, one refrigerant circulation circuit of the air conditioning system 550 is shown.

[0092] Specifically, if Figure 5As shown, air conditioning system 550 has a substantially similar structure to air conditioning system 150, differing in that air conditioning system 550 includes an intermediate-pressure tank 520 having a gas inlet 520a, a gas outlet 520b, and a liquid outlet 520c. Gas inlet 520a communicates with the discharge port 151a of compressor 151 via a first control valve 157 (i.e., first one-way valve 157) to receive high-pressure gas refrigerant discharged from the discharge port 151a of compressor 151. Gas outlet 520b communicates with the high-pressure conduit 125 of switch device 103 (i.e., four-way pilot valve) to direct the high-pressure gas refrigerant discharged from gas outlet 520b into the first control chamber or the second control chamber (not shown) of the four-way valve system. Liquid outlet 520c communicates with the low-pressure side of air conditioning system 550, for example, with the outlet of throttling device 152, to replenish the liquid refrigerant stored in intermediate-pressure tank 520 into air conditioning system 550.

[0093] In this embodiment, the intermediate-pressure tank 520 is a commonly used accessory in air conditioning systems. It serves many functions, such as temporarily storing refrigerant when the system pressure is too high and replenishing refrigerant when the system is low. Therefore, by controllably connecting the intermediate-pressure tank 520 to the high-pressure side of the air conditioning system, the intermediate-pressure tank 520 can be used as a high-pressure control air source, eliminating the need for a separate container.

[0094] In addition, by controlling the diameter of the connecting pipe connecting the gas inlet 520a of the intermediate pressure tank 520 and the exhaust end 151a of the compressor 151, only a small amount of the high-pressure gas refrigerant discharged from the exhaust end 151a of the compressor 151 can flow into the intermediate pressure tank 520 through the gas inlet 520a, which is used to provide a pressure difference between the first control chamber and the second control chamber. Most of the high-pressure gas refrigerant flows into the first heat exchanger 153 or the second heat exchanger 154 after passing through the reversing valve system.

[0095] Figure 6 Including Figure 2A The structural block diagram of another embodiment of the air conditioning system of the reversing valve system in this embodiment is also a four-way reversing valve. Figure 6 In the embodiment shown, the high pressure control gas source comprises an oil storage tank 620. Figure 6 In the illustrated embodiment, one refrigerant circulation circuit of the air conditioning system 650 is shown.

[0096] Specifically, if Figure 6As shown, air conditioning system 650 has a substantially similar structure to air conditioning system 150, differing in that air conditioning system 650 includes an oil storage tank 620 having an inlet 620a, a gas outlet 620b, and an oil outlet 620c, and compressor 151 having an oil outlet 651c and an oil return port 651d. Inlet 620a communicates with oil outlet 651c of compressor 151 via a first control valve 157 (i.e., first one-way valve 157) to receive oil and entrained high-pressure gas refrigerant discharged from oil outlet 651c of compressor 151. Gas outlet 620b communicates with high-pressure conduction pipe 125 of switch device 103 (i.e., four-way pilot valve) to direct high-pressure gas refrigerant discharged from gas outlet 620b into the first control chamber or second control chamber (not shown) of the four-way valve system. The oil outlet 620 c communicates with the oil return port 651 d of the compressor 151 to replenish the oil stored in the oil storage tank 620 into the compressor 151 .

[0097] In this embodiment, the oil storage tank 620 is a common component in air conditioning systems. Oil discharged from the oil separation system of the compressor 151 and the entrained high-pressure gas refrigerant flow into the oil storage tank 620 through the oil outlet 651c on the compressor 151 and the inlet 620a on the oil storage tank 620. Because oil has a high density, it sinks to the bottom of the oil storage tank 620 and is stored. When a certain amount of oil is accumulated, it returns to the compressor 151 through the oil outlet 620c of the oil storage tank 620 and the oil return port 651d on the compressor 151. The entrained high-pressure gas refrigerant in the oil storage tank 620, on the other hand, has a lower density and can be discharged through the gas outlet 620b of the oil storage tank 620. Since the refrigerant discharged from the oil outlet 651c of the compressor 151 is already high-pressure gas refrigerant, in this embodiment, the oil storage tank 620 can be used as a high-pressure control gas source, eliminating the need for a separate container.

[0098] The oil discharged from the oil outlet 651c of the compressor 151 is mixed with only a small amount of high-pressure gas refrigerant, which flows into the oil storage tank 620 through the inlet 620a together with the oil, and is used to provide a pressure difference between the first control chamber and the second control chamber. Most of the high-pressure gas refrigerant is discharged from the exhaust end 151a of the compressor 151, passes through the reversing valve system, and then flows into the first heat exchanger 153 or the second heat exchanger 154.

[0099] Figure 7 for Figure 2A A three-dimensional structural diagram of a specific embodiment of a high-pressure control air source in a reversing valve system is used to illustrate the specific structure of an embodiment of a high-pressure control air source.

[0100] like Figure 7As shown, the high-pressure control gas source includes a high-pressure energy storage tank 720. The high-pressure energy storage tank 720 is a sealed can-shaped container that is used to store high-pressure gas refrigerant. The high-pressure energy storage tank 720 has an inlet 720a at the top and an outlet 720b at the bottom. The inlet 720a and outlet 720b are connected to the interior of the high-pressure energy storage tank 720, allowing the high-pressure gas refrigerant to flow into the high-pressure energy storage tank 720 through the inlet 720a and out through the outlet 720b.

[0101] The inlet 720a of the high pressure energy storage tank 720 is used to pass through the first control valve 157 (see Figures 1A-1C ) is connected to the exhaust port 151a of the compressor 151 to receive high-pressure gas refrigerant from the exhaust port 151a of the compressor in a one-way manner, but cannot discharge high-pressure gas refrigerant from the inlet 720a of the high-pressure energy storage tank 720. The outlet 720b of the high-pressure energy storage tank 720 is used to connect to the switch device 103 (see Figures 1A-1C ,Right now Figure 3A The high-pressure conducting pipe 125 of the four-way pilot valve 303 is connected.

[0102] A maintenance port 733 is also provided on the top of the high-pressure energy storage tank 720. A control valve can also be provided at the maintenance port 733 so that the maintenance port 733 can be controllably connected to an external gas source, thereby providing pressure to the high-pressure energy storage tank 720 through the external gas source, and then providing pressure to the control chamber.

[0103] As an example, when the reversing valve system fails to reverse, the piston stays in the middle position (such as Figure 2A If the air conditioning system needs to be shut down for maintenance (as shown), pressure can be supplied to the high-pressure accumulator tank 720 through the maintenance port 733, and thus to the control chamber, causing the piston to move from the intermediate position to the specified position, thereby completing the reversing of the reversing valve system. In this case, the reversing valve system can be reversed without removing the reversing valve system and all piping of the air conditioning system, and without draining the refrigerant.

[0104] Figure 8A and 8B Based on Figure 2A The schematic structural diagram of another specific embodiment of the reversing valve system is used to illustrate the specific structure of the high-pressure control gas source integrated on the connection port of the housing. Figure 8B for Figure 8A The cross-sectional view of Figure 8A It should be noted that, in this embodiment, the reversing valve system only includes a high-pressure control air source but does not include a low-pressure control air source.

[0105] like Figure 8A and 8BAs shown, the reversing valve system includes a cylindrical housing 801 with a first heat exchanger connection port 813 on the front and a second heat exchanger connection port 814 on the rear. A high-pressure connection port 811 is located above the housing 801, and a low-pressure connection port 812 is located below the housing 801. A left end plate 807 is located at the left end of the housing 801, and a right end plate 808 is located at the right end.

[0106] Housing 801 also includes a piston 802, which reciprocates left and right within housing 801. Piston 802 includes a left end 817 and a right end 818. A first control chamber 804 is formed between the piston's left end 817 and the housing's left end plate 807, while a second control chamber 805 is formed between the piston's right end 818 and the housing's right end plate 808.

[0107] The reversing valve system includes a four-way pilot valve 803, which has four conduits 825, 826, 827, and 828. A first control conduit 827 communicates with the first control chamber 804, and a second control conduit 828 communicates with the second control chamber 805. High-pressure conduit 825 is connected to a high-pressure control air source 820, while low-pressure conduit 826 is connected to a low-pressure connection port 812. It should be noted that in this embodiment, a low-pressure control air source is not included, and low-pressure conduit 826 is directly connected to low-pressure connection port 812. Since low-pressure connection port 812 is intended to connect to the low-pressure side of the air conditioning system, low-pressure conduit 826 of the four-way pilot valve can also be connected to the low-pressure side of the air conditioning system.

[0108] The reversing valve system also includes a high-pressure control gas source. In the embodiment shown in this application, the high-pressure control gas source is a tubular container 820 with closed ends. The tubular container 820 is mounted outside the high-pressure connecting port 811 on the housing 801, so that a control gas source chamber 886 for accommodating high-pressure gas refrigerant is formed between the tubular container 820 and the high-pressure connecting port 811. Specifically, the high-pressure connecting port 811 has an outer wall 885, the interior of which forms a conduit for the high-pressure connecting port 811. The tubular container 820 has an outer wall 884 that surrounds the outer wall 885 of the high-pressure connecting port. The outer wall 884 of the tubular container is spaced a certain distance from the outer wall 885 of the high-pressure connecting port, so that a control gas source chamber 886 can be formed between the outer wall 884 of the tubular container and the outer wall 885 of the high-pressure connecting port. Among them, the upper end 887 and the lower end 888 of the tubular container 820 are connected to the outer wall 885 of the high-pressure connecting port, for example, welded to the outer wall 885, so that the tubular container 820 and the high-pressure connecting port 811 are fixedly connected together, so that the tubular container 820 and the shell 801 are integrated into a single piece, and the control gas source cavity 886 is not connected to the outside air.

[0109] The tubular container 820 has an inlet 820a and an outlet 820b, and a maintenance port 833 is also provided on the outer wall 884. The inlet 820a, outlet 820b, and maintenance port 833 all communicate with the control gas source chamber 886. The inlet 820a communicates with the interior of the outer wall 885 of the high-pressure connection port 811 via a one-way control valve 857, while the outlet 820b communicates with the high-pressure conduit 825 of the four-way pilot valve. Since the high-pressure connection port 811 is intended to connect to the high-pressure side of the air conditioning system, the inlet 820a of the tubular container can also be controllably connected to the high-pressure side of the air conditioning system. It should be noted that while the tubular container 820 is connected to the high-pressure connection port 811, this connection is not direct. Instead, the connection is controllably fluidically connected via the one-way control valve 857. This ensures that high-pressure gas refrigerant flows through the high-pressure connection port 811 into the tubular container 820, but prevents high-pressure gas refrigerant from flowing back from the tubular container 820 into the high-pressure connection port 811. The high-pressure gas refrigerant in the tubular container 820 can only flow out from the outlet 820 b and enter the first control chamber 804 or the second control chamber 805 through the four-way pilot valve 803 .

[0110] It should be noted that the high-pressure control gas source configured as a tubular container can be disposed outside the outer wall of any of the connection ports. In this embodiment, the tubular container 820 is disposed outside the high-pressure connection port 811, making it easy to connect the inlet 820a of the high-pressure control gas source to the high-pressure connection port 811.

[0111] Figure 9 Based on Figure 2A The schematic structural diagram of another specific embodiment of the reversing valve system is used to illustrate the specific structure of the low-pressure control air source integrated with the connection port of the housing. It should be noted that in this embodiment, the reversing valve system only includes the low-pressure control air source and does not include the high-pressure control air source.

[0112] like Figure 9 As shown, the structure of reversing valve system 900 is generally similar to that of reversing valve system 800, and the common parts are not repeated here. Reversing valve system 900 also includes a housing 901, which is provided with a high-pressure connection port 911, a low-pressure connection port 912, a first heat exchanger connection port 913, and a second heat exchanger connection port 914. A left end plate 907 is provided at the left end of housing 901, and a right end plate 908 is provided at the right end. Although not shown, it should be understood that reversing valve system 900 also includes a piston, and two control chambers are also provided between the left end of the piston and the left end plate 907, and between the right end of the piston and the right end plate 908.

[0113] The reversing valve system 900 also includes a four-way pilot valve 903, which has four conducting pipes 925, 926, 927 and 928, wherein the first control conducting pipe 927 is used to communicate with the first control chamber (not shown in the figure), the second control conducting pipe 928 is used to communicate with the second control chamber (not shown in the figure), the high-pressure conducting pipe 925 is connected to the high-pressure connecting port 911, and the low-pressure conducting pipe 926 is used to communicate with the low-pressure control gas source.

[0114] The reversing valve system 900 differs from the reversing valve system 800 in that it does not include a high-pressure control air source, but rather a low-pressure control air source. Specifically, the low-pressure control air source is a tubular container 921, sealed at both ends. The structure of tubular container 921 is similar to that of tubular container 820, but tubular container 921 surrounds and fits over the outside of low-pressure connection port 912, forming a cavity (not shown) between the tubular container 921 and the housing 901. Furthermore, tubular container 921 is integrated with the housing 901 to form a single piece.

[0115] The tubular container 921 has an inlet 921a and an outlet 921b. Inlet 921a communicates with the low-pressure conduit 926 of the four-way pilot valve, while outlet 921b communicates with the low-pressure connection port 912 via a one-way control valve 958. Since the low-pressure connection port 912 is intended to connect to the low-pressure side of the air conditioning system, outlet 921b of the tubular container can also be controllably connected to the low-pressure side of the air conditioning system. It should be noted that while tubular container 921 is connected to the low-pressure connection port 912, this connection is not direct. Instead, the connection is controllably fluidically connected via the one-way control valve 958. Therefore, pressurized or gaseous refrigerant in tubular container 921 can flow into the low-pressure connection port 912, but is prevented from flowing back into tubular container 921 from the low-pressure connection port 912. Furthermore, tubular container 921 can only receive pressurized or gaseous refrigerant from the first control chamber or the second control chamber (not shown) via the four-way pilot valve 903.

[0116] It should be noted that the low-pressure control air source configured as a tubular container can also be disposed outside any of the connection ports. In this embodiment, the tubular container 921 is disposed outside the low-pressure connection port 912, making it easy to connect the inlet 921a of the low-pressure control air source to the low-pressure connection port 912.

[0117] Figure 10 Shown according to Figure 2A The schematic structural diagram of another specific embodiment of the reversing valve system is used to illustrate the specific structure in which the high-pressure control air source is integrated into the end of the housing. It should be noted that in this embodiment, the reversing valve system only includes the high-pressure control air source and does not include the low-pressure control air source.

[0118] like Figure 10As shown, the general structure of reversing valve system 1000 is similar to that of reversing valve system 800, and the common parts are not repeated here. Reversing valve system 1000 also includes a housing 1001, which is provided with a high-pressure connection port 1011, a low-pressure connection port 1012, a first heat exchanger connection port 1013, and a second heat exchanger connection port 1014. A left end plate 1007 is provided at the left end of housing 1001, and a right end plate 1008 is provided at the right end. Although not shown, it should be understood that reversing valve system 1000 also includes a piston, and two control chambers are also provided between the left end of the piston and the left end plate 1007, and between the right end of the piston and the right end plate 1008.

[0119] The reversing valve system 1000 also includes a four-way pilot valve 1003, which has four conducting pipes 1025, 1026, 1027 and 1028, wherein the first control conducting pipe 1027 is used to communicate with the first control chamber (not shown in the figure), the second control conducting pipe 1028 is used to communicate with the second control chamber (not shown in the figure), the high-pressure conducting pipe 1025 is used to communicate with the high-pressure control gas source, and the low-pressure conducting pipe 1026 is used to communicate with the low-pressure connecting port 1012.

[0120] The reversing valve system 1000 also includes a high-pressure control gas source. In this embodiment, the high-pressure control gas source is a high-pressure energy storage tank 1020 configured as a tank-shaped container. The high-pressure energy storage tank 1020 is connected to the end of the housing 1001, for example, by welding or riveting it to the right end plate 1008 of the housing 1001, so that the high-pressure energy storage tank 1020 and the housing 1001 are integrated into a single piece. Although not shown, those skilled in the art will understand that the high-pressure energy storage tank 1020 also has a cavity for accommodating high-pressure gas refrigerant. A maintenance port 1033 is also provided on the outer wall of the high-pressure energy storage tank 1020, which communicates with the cavity.

[0121] The high-pressure accumulator tank 1020 has an inlet 1020a and an outlet 1020b. Inlet 1020a communicates with the high-pressure connection port 1011 via a one-way control valve 1057, while outlet 1020b communicates with the high-pressure conduit 1025 of the four-way pilot valve. It should be noted that while the high-pressure accumulator tank 1020 is connected to the high-pressure connection port 1011, this connection is not direct. Instead, the two are in controllable fluid communication via the one-way control valve 1057. This ensures that high-pressure gas refrigerant flows into the high-pressure accumulator tank 1020 through the high-pressure connection port 1011, but prevents the high-pressure gas refrigerant from flowing out of the high-pressure accumulator tank 1020 and back into the high-pressure connection port 1011. The high-pressure gas refrigerant in the high-pressure accumulator tank 1020 can only flow out of the outlet 1020b and into the first control chamber or the second control chamber through the four-way pilot valve 1003.

[0122] Since the high-pressure energy storage tank 1020 contains a refrigerant in gaseous form, in order to prevent the refrigerant from condensing from gas to liquid and affecting the normal operation of the pneumatic reversing valve system, an insulation layer can also be provided on the outside of the high-pressure energy storage tank 1020. As an example, the outside of the high-pressure energy storage tank 1020 is also wrapped with a layer of insulation cotton 1082.

[0123] Figure 11 Shown according to Figure 2A The schematic structural diagram of another specific embodiment of the reversing valve system is used to illustrate the specific structure in which the low-pressure control air source is integrated into the end of the housing. It should be noted that in this embodiment, the reversing valve system only includes the low-pressure control air source and does not include the high-pressure control air source.

[0124] like Figure 11 As shown, the general structure of reversing valve system 1100 is similar to that of reversing valve system 1000, and the common parts are not repeated here. Reversing valve system 1100 also includes a housing 1101 and a four-way pilot valve. Housing 1101 is provided with a high-pressure connection port 1111, a low-pressure connection port 1112, a first heat exchanger connection port 1113, and a second heat exchanger connection port 1114. A left end plate 1107 is provided at the left end of housing 1101, and a right end plate 1108 is provided at the right end. The four-way pilot valve has four conducting pipes 1125, 1126, 1127, and 1128.

[0125] The reversing valve system 1100 differs from the reversing valve system 1000 in that it does not include a high-pressure control air source, but rather a low-pressure control air source. In this embodiment, the low-pressure control air source is a low-pressure surge tank 1121. This tank-shaped container, similar to the high-pressure energy storage tank 1020, is connected to the right end plate 1108 of the housing 1001. It has an internal cavity and is integrated with the housing 1101 to form a single piece. The low-pressure surge tank 1121 also has an inlet 1121a and an outlet 1121b. Inlet 1121a communicates with the low-pressure conduit 1126 of the four-way pilot valve, while outlet 1121b communicates with the low-pressure connection port 1112 via a one-way control valve 1158. The exterior of the low-pressure surge tank 1121 is also wrapped with a layer of insulation 1182.

[0126] Figure 12 Shown according to Figure 2A The schematic structural diagram of another specific embodiment of the reversing valve system is used to illustrate the specific structure in which a high-pressure control air source and a low-pressure control air source are integrated together and arranged on the housing. It should be noted that in this embodiment, the reversing valve system includes both a high-pressure control air source and a low-pressure control air source.

[0127] like Figure 12As shown, reversing valve system 1200 is similar to reversing valve system 800 and includes a tubular container 1220 serving as a high-pressure control air source. Similar to reversing valve system 1100, it also includes a low-pressure surge tank 1221 serving as a low-pressure control air source. Similar components are not repeated here. Reversing valve system 1200 also includes a housing and a four-way pilot valve. The housing is provided with a high-pressure connection port 1211, a low-pressure connection port 1212, a first heat exchanger connection port 1213, and a second heat exchanger connection port 1214. The left end of the housing is provided with a left end plate 1207, and the right end is provided with a right end plate 1208. The four-way pilot valve has four conducting pipes 1225, 1226, 1227, and 1228.

[0128] Tubular container 1220 surrounds and fits over the outside of high-pressure connection port 1211, forming a cavity between the container and the housing. Tubular container 1220 is integrated with the housing to form a single piece. Tubular container 1220 has an inlet 1220a and an outlet 1220b. Inlet 1220a communicates with high-pressure connection port 1211 via a one-way control valve 1257, while outlet 1220b communicates with a high-pressure conduit 1225 of the four-way pilot valve.

[0129] The low-pressure surge tank 1221 is connected to the right end plate 1208 of the housing. It has an internal cavity and is integrated with the housing to form a single piece. It also has an inlet 1221a and an outlet 12121b. Inlet 1221a communicates with the low-pressure conduit 1226 of the four-way pilot valve, while outlet 1221b communicates with the low-pressure connection port 1212 via a one-way control valve 1258.

[0130] In an embodiment of the present application, the high-pressure control air source and the low-pressure control air source can both be arranged at the ends of the shell, for example, connected to the left end plate or the right end plate of the shell, or can be arranged on the outside of the connection port of the shell, for example, surrounding and sleeved on the outside of the high-pressure connection port or the low-pressure connection port, so that the high-pressure control air source and the low-pressure control air source can be arranged as a whole with the shell.

[0131] Figures 13A-13C FIG1 shows a structural block diagram of another embodiment of an air conditioning system 1350, in which the reversing valve system 1300 is a three-way reversing valve. Figure 13A shows the connection structure of the air conditioning system 1350, Figure 13B and Figure 13C Two refrigerant circulation loops 1360 and 1370 of the air conditioning system 1350 are shown respectively.

[0132] like Figure 13AAs shown, compared with the air conditioning system 150, the air conditioning system 1350 includes not only a compressor 1351, a first heat exchanger 1353, a second heat exchanger 1354, a throttling device 1352, a switch device 103, and a high-pressure control air source 120, but also a third heat exchanger 1355. These are connected to form a closed system through pipelines and filled with refrigerant. In addition, the air conditioning system 1350 also includes a reversing valve system 1300, which can control the operation of the first heat exchanger 1353 and the third heat exchanger 1355 to connect the heat exchanger 1353 and the third heat exchanger 1355. Figure 13B The refrigerant circulation circuit 1360 shown in FIG. 1360 or the second heat exchanger 1354 and the third heat exchanger 1355 are controlled to operate so as to communicate with each other. Figure 13C Refrigerant circulation circuit 1370 is shown.

[0133] like Figure 13A As shown, similar to air conditioning system 150, compressor 1351 includes an exhaust port 1351a and an intake port 1351b, first heat exchanger 1353 includes connections 1353a and 1353b, second heat exchanger 1354 includes connections 1354a and 1354b, throttling device 1352 includes connections 1352a and 1352b, switching device includes high-pressure conduit 125, low-pressure conduit 126, and control conduits 127 and 128, and high-pressure control air source 120 includes an inlet 120a and an outlet 120b. However, unlike air conditioning system 150, third heat exchanger 1355 includes connections 1355a and 1355b, and reversing valve system 1300 does not include a low-pressure connection port, but rather a high-pressure connection port 1311, a first heat exchanger connection port 1313, and a third heat exchanger connection port 1314. In this embodiment, the structure of the reversing valve system 1300 can be Figure 2A The structure shown is essentially the same, differing only in that the low pressure connection port is not included.

[0134] It should be noted that, although the reversing valve system 1300 does not include a low-pressure connection port, the high pressure in the high-pressure control air source 120 and the low pressure on the air-conditioning system suction side (i.e., the side of the compressor suction end 1351b) can still be connected to the two control chambers (not shown in the figure) of the reversing valve system 1300 through the switch device 103, and the reciprocating motion of the piston in the reversing valve system 1300 is controlled, thereby connecting at least two openings in the reversing valve system 1300, so that the air-conditioning system 1350 forms a state as shown in Figure 13B or 13C. Figure 13C The refrigerant circuit is shown.

[0135] Specifically, the high-pressure connection port 1311 of the reversing valve system 1300 is connected to the exhaust port 1351a of the compressor 1351. The first heat exchanger connection port 1313 of the reversing valve system 1300 is connected to the connection port 1353b of the first heat exchanger 1353. The third heat exchanger connection port 1314 of the reversing valve system 1300 is connected to the connection port 1355b of the third heat exchanger 1355. Furthermore, the connection port 1353a of the first heat exchanger 1353 is connected to the connection port 1352a of the throttling device 1352, which is further connected to the connection port 1355a of the third heat exchanger 1355. The connection port 1352b of the throttling device 1352 is connected to the connection port 1354a of the second heat exchanger 1354, and the connection port 1354b of the second heat exchanger 1354 is connected to the intake port 1351b of the compressor 1351. The connection structure between switch device 103 and high-pressure control air source 120 is the same as that in air conditioning system 150 and will not be repeated here. It should be noted that in air conditioning system 1350 of this embodiment, a low-pressure control air source is not included. Therefore, the low-pressure conduction pipe 126 of switch device 103 can be directly connected to the suction port 1351b of compressor 1351.

[0136] As an example, the first heat exchanger 1353 is an air-side heat exchanger, the second heat exchanger 1354 and the third heat exchanger 1355 are both water-side heat exchangers, and the second heat exchanger 1354 and the third heat exchanger 1355 are used to connect to the supply and return water pipes, so that the second heat exchanger 1354 and the third heat exchanger 1355 can provide the heat or cooling required by the user side when working.

[0137] like Figure 13B As shown, the high-pressure connection port 1311 of the reversing valve system 1300 is in fluid communication with the first heat exchanger connection port 1313 of the reversing valve system 1300. At this point, the high-pressure gas refrigerant discharged from the discharge port 1351a of the compressor 1351 flows into the first heat exchanger 1353, where it releases heat and condenses into high-pressure liquid refrigerant. The refrigerant then flows into the throttling device 1352, where it is throttled to low-pressure liquid refrigerant. The refrigerant then flows into the second heat exchanger 1354, where it absorbs heat and evaporates into low-pressure gas refrigerant. The refrigerant finally flows into the intake port 1351b of the compressor 1351, completing the refrigerant cycle. At this point, the second heat exchanger 1354 absorbs heat from the user side, thus providing external cooling, and the air conditioning system is in cooling mode. Furthermore, since the third heat exchanger connection port 1314 of the reversing valve system 1300 is disconnected, the third heat exchanger 1355 is not connected to the refrigerant circulation circuit 1360.

[0138] like Figure 13CAs shown, the high-pressure connection port 1311 of the reversing valve system 1300 is fluidically connected to the third heat exchanger connection port 1314 of the reversing valve system 1300. At this time, the high-pressure gas refrigerant discharged from the discharge port 1351a of the compressor 1351 flows into the third heat exchanger 1355, where it releases heat and is condensed into high-pressure liquid refrigerant. The refrigerant then flows into the throttling device 1352, where it is throttled to low-pressure liquid refrigerant. The refrigerant then flows into the second heat exchanger 1354, where it absorbs heat and evaporates into low-pressure gas refrigerant. Finally, the refrigerant flows into the intake port 1351b of the compressor 1351, completing the refrigerant cycle. At this time, the third heat exchanger 1355 releases heat to the user side, thereby providing external heating, while the second heat exchanger 1354 absorbs heat from the user side, thereby providing external cooling, thus placing the air conditioning system in heat recovery mode. At this time, since the first heat exchanger connection port 1313 of the reversing valve system 1300 is not connected, the first heat exchanger 1353 is not connected to the refrigerant circulation circuit 1370 .

[0139] It can be seen that the reversing valve system of the present application is not only applicable to four-way reversing valves, but also to three-way reversing valves, as long as they are pneumatic reversing valves. Figure 2A The only difference between the four-way reversing valve in FIG. 2 is that the housing 201 does not have a low-pressure connection port, and the structure of the piston 202 and other parts of the housing 201 are the same as those of the four-way reversing valve in FIG. Figure 2A The four-way reversing valve is the same.

[0140] Since the three-way reversing valve does not have a low-pressure connection port, when the piston is in the Figure 2A In the intermediate position shown, high-pressure connection port 1311, first heat exchanger connection port 1313, and third heat exchanger connection port 1314 are interconnected, causing pressure fluctuations on the high-pressure side of the air conditioning system (i.e., reducing the pressure on the high-pressure side of the air conditioning system). By providing a high-pressure control air source 120, the pressure in high-pressure conduit 125 of switch device 103 can be maintained for a certain period of time, thereby maintaining a pressure differential between high-pressure conduit 125 and low-pressure conduit 126. This, in turn, maintains a pressure differential between the two control chambers of the piston, allowing the piston to move to the designated position and ensuring successful reversal of the air conditioning system.

[0141] Although the present application will be described with reference to specific embodiments shown in the accompanying drawings, it should be understood that the reversing valve system of the present application may be modified in many ways without departing from the spirit, scope, and context of the teachings of the present application. Those skilled in the art will also recognize that there are many ways to modify the structural details of the embodiments disclosed in the present application, all of which fall within the spirit and scope of the present application and the claims.

Claims

1. A reversing valve system, characterized in that: The reversing valve system (100) comprises: A housing (201), the housing (201) having a cavity (210), the housing (201) having at least three openings (111, 112, 113, 114), the openings being in fluid communication with the cavity (210), and the housing (201) having a left end plate (207) and a right end plate (208) opposite to each other; a piston (202), the piston (202) being mounted in the cavity (210) of the housing (201) and capable of reciprocating in the cavity (210), the reciprocating motion of the piston (202) being capable of selectively communicating with at least one pair of the at least three openings (111, 112, 113, 114), the piston (202) having a first end (217) and a second end (218) opposite to each other, the first end (217) and the second end (218) being configured to match the shape of the cavity (210) so that a first control chamber (204) is formed between the first end (217) of the piston (202) and the left end plate (207) of the housing (201), and a second control chamber (205) is formed between the second end (218) of the piston (202) and the right end plate (208) of the housing (201); and a switch device (103), wherein the switch device (103) is configured to be connectable to a control air source (120, 121), and the switch device (103) can selectively connect the control air source (120, 121) to the first control chamber (204) or connect the control air source (120, 121) to the second control chamber (205), thereby enabling the piston (202) to remain stationary or reciprocate within the cavity (210) of the housing (201), thereby selectively connecting at least one pair of the at least three openings (111, 112, 113, 114); The at least three openings (111, 112, 113, 114) are independent of the control air source (120, 121) and independent of the first control chamber (204) and the second control chamber (205), and during the reciprocating motion of the piston (202) in the cavity (210) of the housing (201), when the piston (202) passes through a position, the at least three openings (111, 112, 113, 114) can be interconnected, and when the at least three openings (111, 112, 113, 114) are interconnected, the control air source independent of the at least three openings (111, 112, 113, 114) is fluidically connected to the first control chamber (204) or the second control chamber (205) independent of the at least three openings (111, 112, 113, 114) so ​​that the piston (202) continues to move.

2. The reversing valve system according to claim 1, wherein: The piston (202) is provided with a piston isolation plate (231) between the first end (217) and the second end (218) thereof. The piston isolation plate (231) divides the space between the piston (202) and the housing (201) into a first chamber (235) and a second chamber (236). The first chamber (235) is provided with a first partition plate (337) inclined at a first angle, and the second chamber (236) is provided with a second partition plate (338) inclined at a second angle. The piston isolation plate (231) is configured so that its outer contour matches the shape of the cavity (210), so that when the piston isolation plate (231) and the at least three openings (111, 112, 113, 114) are staggered, the first chamber (235) and the second chamber (236) can be isolated from each other. When the at least three openings (111, 112, 113, 114) are located in the first cavity (235), the at least three openings (111, 112, 113, 114) are connected to at least one pair of openings in a first manner; when the at least three openings (111, 112, 113, 114) are located in the second cavity (236), the at least three openings (111, 112, 113, 114) are connected to at least one pair of openings in a second manner.

3. The reversing valve system according to claim 2, wherein: The at least three openings (111, 112, 113, 114) include four openings (111, 112, 113, 114), and the reciprocating motion of the piston (202) can selectively connect the four openings (111, 112, 113, 114) in pairs; When the four openings (111, 112, 113, 114) are located in the first cavity (235), the four openings (111, 112, 113, 114) form a first type of paired communication; when the four openings (111, 112, 113, 114) are located in the second cavity (236), the four openings (111, 112, 113, 114) form a second type of paired communication.

4. The reversing valve system according to claim 3, wherein: The reversing valve system (100) comprises the control air source (120, 121), wherein the control air source (120, 121) comprises at least one of a high-pressure control air source (120) and a low-pressure control air source (121); The four openings (111, 112, 113, 114) include a high-pressure connection port (111) and a low-pressure connection port (112), wherein the high-pressure connection port (111) is used for communicating with a high-pressure side fluid of an air-conditioning system, and the low-pressure connection port (112) is used for communicating with a low-pressure side fluid of the air-conditioning system; The control gas source (120, 121) is independent of the high-pressure connection port (111) and the low-pressure connection port (112).

5. The reversing valve system according to claim 4, wherein: The control gas source (120, 121) comprises a high-pressure control gas source (120), and the high-pressure control gas source (120) has an inlet (120a) and an outlet (120b); The inlet (120a) of the high-pressure control air source (120) is used for controllably fluidly communicating with the high-pressure side of the air-conditioning system, and the outlet (120b) of the high-pressure control air source (120) is fluidly communicated with the switch device (103).

6. The reversing valve system according to claim 4, wherein: The control air source comprises a low-pressure control air source (121), and the low-pressure control air source (121) has an inlet (121a) and an outlet (121b); The inlet (121a) of the low-pressure control air source (121) is in fluid communication with the switch device (103), and the outlet (121b) of the low-pressure control air source (121) is used for controllably communicating with the low-pressure side of the air conditioning system.

7. The reversing valve system according to claim 4, wherein: The control gas source comprises a high-pressure control gas source (120) and a low-pressure control gas source (121), wherein the high-pressure control gas source (120) has an inlet (120a) and an outlet (120b), and the low-pressure control gas source (121) has an inlet (121a) and an outlet (121b); The inlet (120a) of the high-pressure control air source (120) is used for controllably fluidly communicating with the high-pressure side of the air-conditioning system, and the outlet (120b) of the high-pressure control air source (120) is fluidly communicating with the switch device (103); The inlet (121a) of the low-pressure control air source (121) is in fluid communication with the switch device (103), and the outlet (121b) of the low-pressure control air source (121) is used for controllably communicating with the low-pressure side of the air conditioning system.

8. The reversing valve system according to claim 5 or 7, characterized in that: The reversing valve system (100) further includes: A first control valve (157), wherein the inlet (120a) of the high-pressure control gas source (120) is controllably fluidically connected to the high-pressure connection port (111) of the housing (201) through the first control valve (157).

9. The reversing valve system according to claim 6 or 7, characterized in that: The reversing valve system (100) further includes: A second control valve (158), the outlet (121b) of the low-pressure control gas source (121) is controllably fluidically connected to the low-pressure connection port (112) of the housing (201) through the second control valve (158).

10. The reversing valve system according to claim 1, wherein: The switch device (103) is a four-way pilot valve (303), and the four-way pilot valve (303) has four pilot valve conducting pipes (325, 326, 327, 328), and the four pilot valve conducting pipes (325, 326, 327, 328) include a high-pressure conducting pipe (325), a low-pressure conducting pipe (326), a first control conducting pipe (327), and a second control conducting pipe (328); wherein at least one of the high-pressure conducting tube (325) and the low-pressure conducting tube (326) is used for fluid communication with the control gas source (120, 121), the first control conducting tube (327) is used for fluid communication with the first control chamber (204), and the second control conducting tube (328) is used for fluid communication with the second control chamber (205); The four-way pilot valve (303) is controlled by an electromagnetic signal.

11. The reversing valve system according to claim 1, wherein: The cavity (210) is cylindrical in shape.

12. The reversing valve system according to claim 1, wherein: The control gas source (120, 121) is a closed can-shaped container (720).

13. The reversing valve system according to claim 1, wherein: The control air source (120, 121) is integrated on the housing (201).

14. The reversing valve system according to claim 1, wherein: The control gas source (120, 121) has a maintenance port (733, 833, 1033), and the maintenance port (733, 833, 1033) is used to controllably connect or disconnect an external gas source.

15. The reversing valve system according to claim 13, wherein: The control gas source (120, 121) is a closed can-shaped container (1020, 1121, 1221), and the can-shaped container (1020, 1121, 1221) is fixedly connected to at least one of the left end plate (1007, 1107, 1207) and the right end plate (1008, 1108, 1208) of the shell (1001), so that the control gas source (120, 121) and the shell (1001) are integrated into a single piece.

16. The reversing valve system according to claim 13, wherein: The control gas source (120, 121) is a closed tubular container (820, 921, 1220), which is sleeved on the outside of at least one opening (811, 912, 1211) of the at least three openings of the shell (801, 901). A control gas source cavity (886) is formed between the tubular container (820, 921, 1220) and the at least one opening (811, 912, 1211) of the at least three openings, so that the control gas source (120, 121) and the shell (801, 901) are integrated into a single piece.

17. An air conditioning system, characterized in that: The air conditioning system (150) comprises: A compressor (151), a throttling device (152) and at least two heat exchangers (153, 154), the air conditioning system (150) comprising a first refrigerant circulation loop (160) and a second refrigerant circulation loop (170); The air-conditioning system (150) further comprises a reversing valve system (100) according to any one of claims 1 to 16, wherein the reversing valve system (100) controls the air-conditioning system (150) to connect to the first refrigerant circulation circuit (160) or the second refrigerant circulation circuit (170).

18. The air conditioning system according to claim 17, wherein: The at least two heat exchangers (153, 154) include a first heat exchanger (153) and a second heat exchanger (154), wherein the compressor (151), the first heat exchanger (153), the throttling device (152) and the second heat exchanger (154) are sequentially connected to form a first refrigerant circulation loop (160), and the compressor (151), the second heat exchanger (154), the throttling device (152) and the first heat exchanger (153) are sequentially connected to form a second refrigerant circulation loop (170); the compressor (151) has an intake end (151b) and an exhaust end (151a); The at least three openings (111, 112, 113, 114) of the reversing valve system (100) include a high-pressure connection port (111), a low-pressure connection port (112), a first heat exchanger connection port (113), and a second heat exchanger connection port (114), wherein the high-pressure connection port (111) is in fluid communication with the exhaust end (151a) of the compressor (151), the low-pressure connection port (112) is in fluid communication with the intake end (151b) of the compressor (151), the first heat exchanger connection port (113) is in fluid communication with the first heat exchanger (153), and the second heat exchanger connection port (114) is in fluid communication with the second heat exchanger (154); When the piston (202) moves to the first working position, the air-conditioning system (150) is connected to the first refrigerant circulation circuit (160); when the piston (202) moves to the second working position, the air-conditioning system (150) is connected to the second refrigerant circulation circuit (170).

19. The air conditioning system according to claim 17, wherein: The at least two heat exchangers (1353, 1354, 1355) include a first heat exchanger (1353), a second heat exchanger (1354), and a third heat exchanger (1355), wherein the compressor (1351), the first heat exchanger (1353), the throttling device (1352), and the second heat exchanger (1354) are sequentially connected to form a first refrigerant circulation loop (1360), and the compressor (151), the third heat exchanger (1355), the throttling device (1352), and the second heat exchanger (1354) are sequentially connected to form a second refrigerant circulation loop (1370); the compressor (1351) has an intake end (1351b) and an exhaust end (1351a); The at least three openings (1311, 1313, 1314) of the reversing valve system (1300) include a high-pressure connection port (1311), a first heat exchanger connection port (1313), and a third heat exchanger connection port (1314), wherein the high-pressure connection port (1311) is in fluid communication with the exhaust end (1351a) of the compressor (1351), the first heat exchanger connection port (1313) is in fluid communication with the first heat exchanger (1353), and the third heat exchanger connection port (1314) is in fluid communication with the third heat exchanger (1355); When the piston moves to the first working position, the air-conditioning system (1350) is connected to the first refrigerant circulation circuit (1360), and when the piston moves to the second working position, the air-conditioning system (1350) is connected to the second refrigerant circulation circuit (1370).

20. The air conditioning system according to claim 18 or 19, characterized in that: The air conditioning system (150) includes the control air source (120, 121), the control air source (120, 121) includes a high-pressure control air source (120), the high-pressure control air source (120) has an inlet (120a) and an outlet (120b), the inlet (120a) of the high-pressure control air source (120) is controllably fluidically connected to the exhaust end (151a) of the compressor (151), and the outlet (120b) of the high-pressure control air source (120) is fluidically connected to the switch device (103).

21. The air conditioning system according to claim 18, wherein: The air conditioning system (150) includes the control air source (120, 121), the control air source (120, 121) includes a low-pressure control air source (121), the low-pressure control air source (121) has an inlet (121a) and an outlet (121b), the inlet (121a) of the low-pressure control air source (121) is fluidically connected to the switch device (103), and the outlet (121b) of the low-pressure control air source (121) is controllably fluidically connected to the suction end (151b) of the compressor (151).

22. The air conditioning system according to claim 20, wherein: The high-pressure control gas source (120) comprises a medium-pressure tank (520), wherein the medium-pressure tank (520) has a gas inlet (520a), a gas outlet (520b), and a liquid outlet (520c); The gas inlet (520a) of the medium-pressure tank (520) is controllably fluidically connected to the exhaust end (151a) of the compressor (151), the gas outlet (520b) of the medium-pressure tank (520) is fluidically connected to the switch device (103), and the liquid outlet (520c) of the medium-pressure tank (520) is controllably fluidically connected to the outlet side of the throttling device (152) of the air-conditioning system (150).

23. The air conditioning system according to claim 20, wherein: The high-pressure control gas source (120) includes an oil storage tank (620), the oil storage tank (620) has an inlet (620a), a gas outlet (620b), and an oil outlet (620c), and the compressor (151) has an oil outlet (651c) and an oil return port (651d); The inlet (620a) of the oil storage tank (620) is controllably fluidically connected to the oil outlet (651c) of the compressor (151), the gas outlet (620b) of the oil storage tank (620) is fluidically connected to the switch device (103), and the oil outlet (620c) of the oil storage tank (620) is controllably fluidically connected to the oil return port (651d) of the compressor (151).

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