CN112324944A

CN112324944A - Reversing valve system and air conditioning system comprising same

Info

Publication number: CN112324944A
Application number: CN201910717535.3A
Authority: CN
Inventors: 李静; 徐文远; 周月娴
Original assignee: York Guangzhou Air Conditioning and Refrigeration Co Ltd; Johnson Controls Technology Co
Current assignee: York Guangzhou Air Conditioning and Refrigeration Co Ltd; Johnson Controls Technology Co
Priority date: 2019-08-05
Filing date: 2019-08-05
Publication date: 2021-02-05

Abstract

The application provides a switching-over valve system and use air conditioning system of this switching-over valve system, the switching-over valve system includes: the shell is provided with a cavity, and the shell is provided with at least three openings; a piston reciprocable within the cavity; and a switching device configured to be connectable to a source of control gas, the switching device being capable of holding the piston stationary or reciprocating within the chamber to selectively communicate with at least one pair of the at least three openings; wherein the at least three openings are independent of the control gas source. The reversing valve system and the air conditioning system have the advantages that the reversing valve system can be successfully reversed even if the pressure in the high-pressure side or the low-pressure side of the air conditioning system fluctuates by arranging the control air source independent of the opening of the shell of the reversing valve system.

Description

Reversing valve system and air conditioning system comprising same

Technical Field

The application relates to the field of air conditioning systems, in particular to a reversing valve system in an air conditioning system.

Background

The existing air conditioning system comprises a compressor, a throttling device and at least two heat exchangers, and the compressor, the throttling device and the at least two heat exchangers form a circulating system of refrigerant. When the refrigerant flows in different directions, the refrigerant can flow through the at least two heat exchangers in different sequences, such that the air conditioning system operates in different modes. The air conditioning system further includes a reversing valve system for changing a flow direction of the refrigerant. For example, when the reversing valve system is controlled such that the refrigerant flows in one direction, the air conditioning system is operated in a cooling mode. When the reversing valve system is controlled such that the refrigerant flows in the opposite direction, the air conditioning system operates in the heating mode.

Disclosure of Invention

One prior reversing valve system is reversed by pneumatic control. The reversing valve system has four openings that communicate with the compressor suction side, the compressor discharge side, and at least two heat exchangers, respectively. By providing a pressure difference to the reversing valve system, the four openings can be communicated in pairs in two ways, thereby changing the flow direction of the refrigerant.

However, even if it is ensured that the magnitude of the pressure difference supplied to the reversing valve system is not lower than a desired value when the reversing valve system is actuated, the conventional reversing valve system sometimes fails in reversing, so that the air conditioning system needs to be stopped for maintenance, and even the refrigerant may need to be recovered and the piping may need to be removed. In some cases, failure to reverse may also result in failure of the oil system in the air conditioning system to circulate and damage the compressor.

In order to solve the above problems, at least one object of the present application is to provide a reversing valve system capable of ensuring the success of reversing the reversing valve system.

To achieve the above object, the present application provides in a first aspect a reversing valve system comprising: a housing having a cavity with at least three openings therein in fluid communication with the cavity, the housing having opposing left and right end plates; a piston mounted within the cavity of the housing and reciprocable within the cavity, the reciprocation of the piston selectively communicating with at least one pair of the at least three openings, the piston having opposing first and second ends configured to conform to the shape of the cavity such that a first control chamber is formed between the first end of the piston and the left end plate of the housing and a second control chamber is formed between the second end of the piston and the right end plate of the housing; and a switching device configured to be connectable with a control gas source, the switching device being capable of selectively placing the control gas source in fluid communication with the first control chamber or the control gas source in fluid communication with the second control chamber such that the piston is capable of remaining stationary or reciprocating within the cavity of the housing to selectively communicate with at least one pair of the at least three openings; wherein the at least three openings are independent of the control gas source.

According to the first aspect, the piston is provided with a piston separation plate between the first end and the second end thereof, the piston separation 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, the second chamber is provided with a second partition plate inclined at a second angle, and the piston separation plate is configured such that the outer contour thereof matches the shape of the receiving chamber, so that the first chamber and the second chamber can be isolated from each other when the piston separation plate and the four openings are staggered; wherein the at least three openings communicate with at least one pair of openings in a first manner when the at least three openings are in the first cavity; the at least three openings communicate with at least one pair of openings in a second manner when the at least three openings are in the second cavity.

According to the first aspect, the at least three openings include four openings, and the reciprocating motion of the piston selectively connects the four openings in pairs; wherein the four openings form a first pattern of paired communication when the four openings are in the first chamber; the four openings form a second manner of paired communication when the four openings are in the second chamber.

According to the first aspect above, the reversing valve system comprises the control gas source, the control gas source comprising at least one of a high pressure control gas source and a low pressure control gas source; the four openings comprise a high-pressure connecting port and a low-pressure connecting port, the high-pressure connecting port is used for being in fluid communication with a high-pressure side of an air conditioning system, and the low-pressure connecting port is used for being in fluid communication with a low-pressure side of the air conditioning system; the control gas source is independent of the high-pressure connecting port and the low-pressure connecting port.

According to the first aspect above, the control gas source comprises a high pressure control gas source having an inlet and an outlet; the inlet of the high pressure control air supply is for controllable fluid communication with a high pressure side of the air conditioning system, and the outlet of the high pressure control air supply is in fluid communication with the switching device.

According to the first aspect above, the control gas source comprises a low pressure control gas source having an inlet and an outlet; the inlet of the low pressure control air supply is in fluid communication with the switching device and the outlet of the low pressure control air supply is for controllable fluid communication with a low pressure side of the air conditioning system.

According to the first aspect above, the control gas source comprises a high pressure control gas source having an inlet and an outlet and a low pressure control gas source having an inlet and an outlet; the inlet of the high pressure control air supply is in controllable fluid communication with a high pressure side of the air conditioning system, and the outlet of the high pressure control air supply is in fluid communication with the switching device; the inlet of the low pressure control air supply is in fluid communication with the switching device and the outlet of the low pressure control air supply is for controllable fluid communication with a low pressure side of the air conditioning system.

According to the first aspect described above, the reversing valve system further comprises: a first control valve through which the inlet of the high pressure control gas source is in controllable fluid communication with the high pressure connection port of the housing.

According to the first aspect described above, the reversing valve system further comprises: a second control valve through which the outlet of the low pressure control gas source is in controllable fluid communication with the low pressure connection port of the housing.

According to the first aspect, the switching device is a four-way pilot valve having four pilot valve conducting tubes including 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 conduit and the low pressure conduit is for fluid communication with the control gas source, the first control conduit is for fluid communication with the first control chamber, and the second control conduit is for fluid communication with the second control chamber; the four-way pilot valve is controlled by an electromagnetic signal.

According to the first aspect, the cavity is cylindrical in shape.

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

According to the first aspect, the control air source is integrally arranged on the shell.

According to the first aspect, the control gas source is provided with a maintenance port for controllably connecting or disconnecting an external gas source.

According to the first aspect, the control air source is a closed pot-shaped container fixedly connected to at least one of the left end plate and the right end plate of the housing, so that the control air source and the housing are integrally arranged to form a single piece.

According to the first aspect, the control air source is a closed tubular container, the tubular container is sleeved outside at least one opening of the four openings of the housing, and a control air source cavity is formed between the tubular container and the at least one opening of the four openings, so that the control air source and the housing are integrally arranged to form a single piece.

The present application provides in a second aspect an air conditioning system comprising: the air conditioning system comprises a first refrigerant circulating loop and a second refrigerant circulating loop; the air conditioning system further comprises a reversing valve system as described in the first aspect, which controls the air conditioning system to communicate with the refrigerant first circulation circuit or the refrigerant second circulation circuit.

According to the second aspect, the at least two heat exchangers comprise 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 sequentially connected to form a first refrigerant circulation loop, and the compressor, the second heat exchanger, the throttling device and the first heat exchanger are sequentially connected to form a second refrigerant circulation loop; the compressor has a suction end and a discharge end; the at least three openings of the reversing valve system include a high pressure connection port in fluid communication with the discharge end of the compressor, a low pressure connection port in fluid communication with the suction end of the compressor, a first heat exchanger connection port in fluid communication with the first heat exchanger, and a second heat exchanger connection port in fluid communication with the second heat exchanger; when the piston moves to the first working position, the air conditioning system is communicated with the first refrigerant circulating loop, and when the piston moves to the second working position, the air conditioning system is communicated with the second refrigerant circulating loop.

According to the 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 sequentially connected to form a first refrigerant circulation loop, and the compressor, the third heat exchanger, the throttling device and the second heat exchanger are sequentially connected to form a second refrigerant circulation loop; the compressor has a suction end and a discharge 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 in fluid communication with the discharge end of the compressor, the first heat exchanger connection port is in fluid communication with the first heat exchanger, and the third heat exchanger connection port is in fluid communication with the third heat exchanger; when the piston moves to the first working position, the air conditioning system is communicated with the first refrigerant circulating loop, and when the piston moves to the second working position, the air conditioning system is communicated with the second refrigerant circulating loop.

In accordance with the second aspect described above, the air conditioning system includes the control air supply, which includes a high pressure control air supply having an inlet and an outlet, the inlet of the high pressure control air supply being in controllable fluid communication with the discharge end of the compressor, the outlet of the high pressure control air supply being in fluid communication with the switching device.

According to the second aspect, the air conditioning system comprises the control air supply, the control air supply comprises a low pressure control air supply having an inlet and an outlet, the inlet of the low pressure control air supply is in controllable fluid communication with the switching device, and the outlet of the low pressure control air supply is in controllable fluid communication with the suction end of the compressor.

According to the second aspect above, the high pressure controlled gas source comprises a medium pressure tank having a gas inlet, a gas outlet and a liquid outlet; wherein the gas inlet of the intermediate pressure tank is in controllable fluid communication with the discharge end of the compressor, the gas outlet of the intermediate pressure tank is in controllable fluid communication with the switching device, and the liquid outlet of the intermediate pressure tank is in controllable fluid communication with an outlet side of the throttling device of the air conditioning system.

According to the second aspect above, the high pressure control gas source comprises an oil storage tank having an inlet, a gas outlet and an oil outlet, the compressor having an oil outlet and an oil return; wherein said inlet of said oil storage tank is in controllable fluid communication with said oil outlet of said compressor, said gas outlet of said oil storage tank is in fluid communication with said switching device, said oil outlet of said oil storage tank is in controllable fluid communication with said oil return of said compressor.

The reversing valve system and the air conditioning system have the advantages that the reversing valve system and the air conditioning system are provided with the control air source independent of the opening of the shell 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, the pressure difference between the control chamber and the pressure provided by the switching device to the reversing valve system cannot be directly influenced, the piston can move to the specified position, and the reversing success of the reversing valve system is ensured.

Drawings

FIG. 1A is a block diagram of an embodiment of an air conditioning system of the present application;

FIGS. 1B and 1C are block diagrams of two refrigerant circulation circuits of the air conditioning system of FIG. 1A;

FIGS. 2A-2C are block diagrams of one embodiment of the reversing valve system of FIG. 1A;

3A-3C are perspective block diagrams of one embodiment of the diverter valve system of FIG. 2A;

FIGS. 4A-4B are schematic diagrams illustrating the switch device of FIG. 3A;

FIG. 5 is a block diagram of another embodiment of an air conditioning system including the reversing valve system of FIG. 2A;

FIG. 6 is a block diagram of a further embodiment of an air conditioning system including the reversing valve system of FIG. 2A;

FIG. 7 is a perspective block diagram of one embodiment of a high pressure controlled gas source in the diverter valve system of FIG. 2A;

FIGS. 8A and 8B are perspective block diagrams of another embodiment of the diverter valve system according to FIG. 2A;

FIG. 9 is a perspective block diagram of another embodiment of the reversing valve system according to FIG. 2A;

FIG. 10 is a perspective block diagram of yet another embodiment of the reversing valve system according to FIG. 2A;

FIG. 11 is a perspective view of yet another embodiment of the reversing valve system according to FIG. 2A;

FIG. 12 is a perspective block diagram of yet another embodiment of the diverter valve system according to FIG. 2A;

FIGS. 13A-13C are block diagrams of alternative embodiments of the air conditioning system of the present application.

Detailed Description

Various embodiments of the present application will now be described with reference to the accompanying drawings, which form a part hereof. It should be understood that although directional terms, such as "front," "rear," "upper," "lower," "left," "right," "top," "bottom," "side," and the like may be used herein to describe various example structural portions and elements of the application, these terms are used herein for convenience of description only and are intended to be based on the example orientations shown in the figures. Because the embodiments disclosed herein can be arranged in a variety of orientations, these directional terms are used for purposes of illustration only and are not to be construed as limiting.

Fig. 1A to 1C are block diagrams showing an embodiment of an air conditioning system of the present application, which are used to explain a connection relationship of the directional valve system 100 in the air conditioning system 150. In which fig. 1A shows a connection structure of the air conditioning system 150, and fig. 1B and 1C show two

refrigerant circulation circuits

160 and 170 of the air conditioning system 150, respectively, in which fig. 1B shows the refrigerant circulation circuit 160 in a cooling mode, and fig. 1C shows the refrigerant circulation circuit 170 in a heating mode.

As shown in fig. 1A, 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 by piping to form a closed system, and the system is charged with refrigerant. The air conditioning system 150 further includes a reversing valve system 100, the reversing valve system 100 being capable of controlling the air conditioning system 150 to communicate with either the refrigerant circulation loop 160 as shown in fig. 1B or the refrigerant circulation loop 170 as shown in fig. 1C.

As shown in fig. 1A, the compressor 151 includes a discharge end 151A and a suction 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, and in the present 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. Wherein the components are connected by tubing to achieve fluid communication as follows: 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. The connection port 153a of the first heat exchanger 153 is connected to the connection port 152a of the throttle device 152, and the connection port 152b of the throttle device 152 is connected to the connection port 154a of the second heat exchanger 154. As an example, the first heat exchanger 153 is a wind side heat exchanger, the second heat exchanger 154 is a water side heat exchanger, and the second heat exchanger 154 is used for connecting with a water supply and return pipe, so that the second heat exchanger 154 can provide heat or cold required by a user side when operating.

In addition, the reversing valve system 100 further comprises a switching device 103 and a control gas source, which comprises a high-pressure control gas source 120 and a low-pressure control gas source 121. It should be noted that, in the embodiment of the present application, the high-pressure control gas source 120 and the low-pressure control gas source 121 only indicate the controlled high-pressure or low-pressure, and do not represent the actual gas. As one example, the high pressure control gas source 120 may be a vessel containing high pressure gas refrigerant to have a higher pressure; the low pressure control gas source 121 may be a container having a cavity with a lower pressure to receive the pressure or gaseous refrigerant discharged from the outside. Specifically, the high-pressure control gas source 120 and the low-pressure control gas source 121 may each include a tank-shaped container, the high-pressure control gas source 120 may be a high-pressure energy storage tank for storing high-pressure gas refrigerant, and the low-pressure control gas source 121 may be a low-pressure surge tank for receiving pressure or gas refrigerant to maintain the pressure stable. When the high-pressure control gas source 120 and the low-pressure control gas source 121 contain the refrigerant in a gas form, in order to avoid the refrigerant from being condensed from a gas state to a liquid state to affect the normal operation of the pneumatic reversing valve system 100, an insulating layer may be further disposed outside the high-pressure control gas source 120 and the low-pressure control gas source 121 to insulate the high-pressure control gas source 120 and the low-pressure control gas source 121, such as the insulating cotton 1082 in fig. 10 and the insulating cotton 1182 in fig. 11.

Wherein the switching device 103 includes a high pressure conduit 125, a low pressure conduit 126, and control

conduits

127 and 128, the high pressure control gas source 120 includes an inlet 120a and an outlet 120b, and the low pressure control gas source 121 includes an inlet 121a and an outlet 121 b. Wherein the components are connected by tubing to achieve fluid communication as follows: the inlet 120a of the high pressure control gas source 120 is controllably connected to the discharge end 151a of the compressor 151, and the high pressure conduction pipe 125 of the switching device 103 is connected to the outlet 120b of the high pressure control gas source 120, whereby the high pressure conduction pipe 125 of the switching device 103 is controllably communicated with the discharge end 151a of the compressor 151 through the high pressure control gas source 120. The low pressure conduction pipe 126 of the switching device 103 is connected to the inlet 121a of the low pressure control gas source 121, and the outlet 121b of the low pressure control gas source 121 is controllably connected to the suction end 151b of the compressor 151, whereby the low pressure conduction pipe 126 of the switching device 103 is controllably communicated with the suction end 151b of the compressor 151 through the low pressure control gas source 121. Wherein the

control conduits

127 and 128 of the switching device 103 are connected to control chambers 204 and 205 (see fig. 2A-2C) in the reversing valve system 100.

Specifically, the air conditioning system 150 further includes a first control valve 157 and a second control valve 158, and as one 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 therethrough is one-way flowing from the inlet to the outlet. Wherein an inlet of the first control valve 157 is connected to a discharge end 151a of the compressor 151, an outlet of the first control valve 157 is connected to an inlet 120a of the high pressure control gas source 120, and wherein an inlet of the second control valve 158 is connected to an outlet 121b of the low pressure control gas source 121, and an outlet of the second control valve 158 is connected to a suction end 151b of the compressor 151. Thus, first control valve 157 is capable of allowing refrigerant to flow into high pressure control gas source 120, but preventing refrigerant from flowing out of high pressure control gas source 120, allowing high pressure to be maintained in high pressure control gas source 120 for a period of time; the second control valve 158 allows the refrigerant in the low pressure control gas source 121 to flow out, but prevents the refrigerant from flowing into the low pressure control gas source 121, maintaining the low pressure in the low pressure control gas source 121 for a period of time. The high-pressure control air source 120 and the low-pressure control air source 121 can maintain the pressure difference within a certain time, so that the reversing of the reversing valve system is smoothly completed.

In other embodiments, the inlet of the first control valve 157 may also be connected to elsewhere on the high pressure side of the air conditioning system or not connected in the air conditioning system, but rather to a control gas source at other high pressure outside the air conditioning system, such as to an additional refrigerant gas compression tank or the like. Likewise, the outlet of the second control valve 158 may be connected to a source of low pressure control air outside the air conditioning system, such as a low pressure tank or the like, or not connected to the air conditioning system.

Thus, the high-pressure control gas source 120 and the low-pressure control gas source 121 can be isolated from or not directly communicated with the high-pressure side or the low-pressure side of the air conditioning system, and further, the four connection ports (i.e., the four openings) 111,112,113,114 of the reversing valve system 100, so that the high-pressure control gas source 120 and the low-pressure control gas source 121 are independent of the four connection ports 111,112,113,114 of the reversing valve system 100. The pressures in the high pressure control gas source 120 and the low pressure control gas source 121 are introduced into the

control chambers

204 and 205 in the reversing valve system 100 by the switching device 103, thereby providing a pressure differential between the

control chambers

204 and 205 in the reversing valve system 100. When the pressure in the high pressure side of the air conditioning system or the low pressure side of the air conditioning system fluctuates, the pressure difference provided by the switching device 103 to the

control chambers

204 and 205 in the reversing valve system 100 is not directly affected.

As an example, by controlling the pipe diameter of the connection pipe connected between the inlet 120a of the high pressure control gas source 120 and the discharge end 151a of the compressor 151, only a small amount of high pressure gas refrigerant discharged from the discharge end 151a of the compressor 151 can flow into the high pressure control gas source 120 through the inlet 120a of the high pressure control gas source 120 for providing a pressure difference between the

control chambers

204 and 205, and 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 100 to participate in the refrigerant circulation loop of the air conditioning system 150. Therefore, although the high pressure control air source 120 separately connected to the high pressure side of the air conditioning system and the low pressure control air source 121 separately connected to the low pressure side of the air conditioning system are provided, the refrigerant cycle of the air conditioning system 150 is not affected.

It should be noted that in some embodiments of the present application, the control gas source may also include only one of the high-pressure control gas source 120 and the low-pressure control gas source 121. When the control gas source comprises only the high-pressure control gas source 120, the low-pressure conduction pipe 126 of the switch device 103 is directly connected to the suction end 151b of the compressor 151; and when the control gas source includes only the low-pressure control gas source 121, the high-pressure conduction pipe 125 of the switching device 103 is directly connected to the discharge end 151a of the compressor 151.

The switching device 103 controls the air conditioning system 150 to communicate with the refrigerant circulation circuit 160 shown in fig. 1B or communicate with the refrigerant circulation circuit 170 shown in fig. 1C by communicating the high pressure control gas source 120 with one of the

control chambers

204 and 205 and communicating the low pressure control gas source 121 with the other of the

control chambers

204 and 205 so that the four connection ports 111,112,113,114 of the reversing valve system 100 communicate in pairs. The structural principle of the switching device 103 controlling the four connection ports 111,112,113,114 of the reversing valve system 100 to communicate in pairs will be described in detail with reference to fig. 2A-2C.

As shown in FIG. 1B, the four connection ports 111,112,113,114 of the reversing valve system 100 communicate in pairs in a first manner, i.e., the high-pressure connection port 111 of the reversing valve system 100 is in fluid communication with 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 in fluid communication with 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 end 151a of the compressor 151 flows into the first heat exchanger 153, releases heat in the first heat exchanger 153, is condensed into a high-pressure liquid refrigerant, then flows into the expansion device 152, is expanded into a low-pressure liquid refrigerant, then flows into the second heat exchanger 154, absorbs heat in the second heat exchanger 154, is evaporated into a low-pressure gas refrigerant, and finally flows into the suction end 151b of the compressor 151, thereby completing the refrigerant cycle. At this time, the second heat exchanger 154 absorbs heat of the user side, and thus can cool the outside, and the air conditioning system is in a cooling mode.

In the cooling mode, the refrigerant flowing between the discharge end 151a of the compressor 151 and the connection port 152a of the throttling device 152 (i.e., the high-pressure side of the air conditioning system) through the first heat exchanger 153 is a high-pressure refrigerant, and the refrigerant flowing between the connection port 152b of the throttling device 152 and the suction end 151b of the compressor 151 (i.e., the low-pressure side of the air conditioning system) through the second heat exchanger 154 is a low-pressure refrigerant.

As shown in FIG. 1C, the four connection ports 111,112,113,114 of the reversing valve system 100 communicate in pairs in a second manner, i.e., the high-pressure connection port 111 of the reversing valve system 100 is in fluid communication with 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 in fluid communication with 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 end 151a of the compressor 151 flows into the second heat exchanger 154, releases heat in the second heat exchanger 154, is condensed into a high-pressure liquid refrigerant, then flows into the expansion device 152, is expanded into a low-pressure liquid refrigerant, then flows into the first heat exchanger 153, absorbs heat in the first heat exchanger 153, is evaporated into a low-pressure gas refrigerant, and finally flows into the suction end 151b of the compressor 151, thereby completing the refrigerant cycle. At this time, the second heat exchanger 154 releases heat to the user side, so that the air conditioning system can be in a heating mode by heating the outside.

In the heating mode, the refrigerant flowing between the discharge end 151a of the compressor 151 and the connection port 152b of the expansion device 152 (i.e., the high-pressure side of the air conditioning system) via the second heat exchanger 154 is a high-pressure refrigerant, and the refrigerant flowing between the connection port 152a of the expansion device 152 and the suction end 151b of the compressor 151 (i.e., the low-pressure side of the air conditioning system) via the first heat exchanger 153 is a low-pressure refrigerant.

Fig. 2A-2C are block diagrams of one embodiment of the reversing valve system 100 of fig. 1A, illustrating the operation of the reversing valve system 100. In which the housing 201 is shown in dashed lines, the piston 202 in fig. 2A, 2B and 2C is in a different position with respect to the housing 201. The piston 202 in fig. 2A is in a middle position, and is used for illustrating the positional relationship between the piston and the four connecting ports when the four connecting ports are communicated with each other; the piston 202 in fig. 2B is at the rightmost end and is used for illustrating the positional relationship between the piston and the four connection ports when the four connection ports are communicated in pairs in the first manner; the piston 202 in fig. 2C is at the leftmost end and is used to show the positional relationship between the piston and the four connection ports when the four connection ports communicate in pairs in the second manner.

As shown in fig. 2A-2C, reversing valve system 100 includes a housing 201, a piston 202, and a switch arrangement 103, wherein piston 202 reciprocates within housing 201 and switch arrangement 103 is used to control the movement of piston 102 within housing 101.

Specifically, the housing 201 is substantially in the shape of a cylinder or a square cylinder with two closed ends, the housing 201 has a cavity 210 inside, and the two ends of the housing 201 include a left end plate 207 and a right end plate 208. Wherein the piston 202 is disposed in the cavity 210 and moves linearly in the cavity 210 to the left end plate 207 or to the right end plate 208. The four connection ports 111,112,113,114 of the reversing valve system 100 are disposed in the middle of the housing 201 in a circumferential direction of the housing 201 in a pair-wise opposition. In the embodiment shown in the drawings, the high-pressure connection port 111 and the low-pressure connection port 112 of the reversing valve system 100 are oppositely disposed on the housing 201 in the up-down direction, and the first heat exchanger connection port 113 and the second heat exchanger connection port 114 are oppositely disposed on the housing 201 in the front-rear direction.

The piston 202 comprises a piston left end 217 (i.e. a first end) and a piston right end 218 (i.e. a second end), wherein the left end 217 and the right end 218 of the piston 202 have a shape or an outer contour substantially identical or matching the shape of the cavity 210 of the housing 201, such that a substantially 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 substantially 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 switching device 103 controls the high pressure control gas source 120, the low pressure control gas source 121 and the

control conduits

127 and 128 to communicate, the switching device 103 can communicate the high pressure control gas source 120 with one of the first control chamber 204 and the second control chamber 205 and communicate the low pressure control gas source 121 with 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 time, the pressure difference can keep the piston 202 at the current position, or the control chamber on the higher pressure side can control the piston 202 to move to the control chamber on the lower pressure side until the end (e.g., left end 217 or right end 218) of the piston 202 abuts against the end plate (e.g., left end plate 207 or right end plate 208) of the housing 201.

The piston 202 further includes a piston isolation plate 231, and the piston isolation plate 231 is disposed between the left end 217 and the right end 218, and divides a space between the piston 202 and the housing 201 into a first chamber 235 and a second chamber 236, i.e., a space enclosed between a portion between the left end 217 and the right end 218 of the piston 202 and a 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 such that the four connecting ports 111,112,113,114 of the reversing valve system 100 can be located in the first chamber 235 or the second chamber 236, respectively (i.e., communicate with the first chamber 235 or the second chamber 236, respectively). Wherein the shape of the piston isolating plate 231 is also substantially the same as or matched to the shape of the cavity 210 of the housing 201 (i.e., the shape of the cross-section of the cavity 210), such that when the piston 202 is in the position shown in fig. 2B and 2C, the piston isolating plate 231 is offset from the four connecting 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. While the piston 202 is in the position shown in fig. 2A, the piston isolation plate 231 is not misaligned with the four ports 111,112,113,114 of the reversing valve system 100, and the first chamber 235 and the second chamber 236 are in communication with each other through the four ports 111,112,113,114 of the reversing valve system 100, i.e., the four ports 111,112,113,114 of the reversing valve system 100 are also in communication with each other. 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 communicated with each other, so that the pressures of the high pressure side and the low pressure side of the air conditioning system are rapidly balanced, that is, the pressure in the pipe of the high pressure side of the air conditioning system is rapidly decreased, and the pressure in the pipe of the low pressure side of the air conditioning system is rapidly increased.

Also, a first partition 337 (see the first partition 337 in fig. 3A) inclined at a first angle is provided in the first chamber 235, a second partition 338 (see the second partition 338 in fig. 3A) inclined at a second angle is provided in the second chamber 236, and the first partition 337 and the second partition 338 are provided to partition the first chamber 235 and the second chamber 236, respectively, to selectively communicate the four connection ports 111,112,113,114 of the reversing valve system 100 in pairs. The specific manner in which the first and

second partitions

337, 338 communicate with the four connection ports will be described in detail below in conjunction with fig. 3A-3C.

The switch arrangement 103 includes four conducting

conduits

125, 126, 127 and 128, a first control conducting conduit 127, a second control conducting conduit 128, a high pressure conducting conduit 125 and a low pressure conducting conduit 126, respectively, wherein the first control conducting conduit 127 is in communication with the first control chamber 204, the second control conducting conduit 128 is in communication with the second control chamber 205, the high pressure conducting conduit 125 is for communication with the high pressure control gas source 120, and the low pressure conducting conduit 126 is for communication with the low pressure control gas source 121.

As shown in FIG. 2B, the switching device 103 controls the high pressure control gas source 120 to communicate with the first control chamber 204 through the first control conduit 127 and controls the low pressure control gas source 121 to communicate with the second control chamber 205 through the second control conduit 128. At this point, 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 operating position). The four ports 111,112,113,114 of the reversing valve system 100 are located in the first chamber 235, and a first partition 337 (not shown, see FIGS. 3A-3C) in the first chamber 235 connects the four ports 111,112,113,114 in pairs in a first manner. The piston isolating plate 231 is misaligned with the four connection ports 111,112,113,114 so that the first chamber 235 and the second chamber 236 are sealed from each other.

At this time, the reversing valve system 100 is in communication with the recirculation loop 160 of the air conditioning system 150 as shown in FIG. 1B, and the air conditioning system is in cooling mode.

As shown in FIG. 2C, the switching device 103 controls the low pressure control gas source 121 to communicate with the first control chamber 204 through the first control conduit 127 and controls the high pressure control gas source 120 to communicate with the second control chamber 205 through the second control conduit 128. At this point, 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 far left (i.e., the second operating position). The four ports 111,112,113,114 of the reversing valve system 100 are located in the second chamber 236, and a second partition 338 (not shown, see FIGS. 3A-3C) in the second chamber 236 communicates the four ports 111,112,113,114 in pairs in a second manner. At this time, the piston isolating plate 231 is misaligned with the four connection ports 111,112,113,114, and thus the first chamber 235 and the second chamber 236 are sealed from each other.

At this time, the reversing valve system 100 communicates with the circulation loop 170 of the air conditioning system 150 as shown in fig. 1C, and the air conditioning system is in a heating mode.

It is noted that when the air conditioning system is switched from the cooling mode to the heating mode, or from the heating mode to the cooling mode, the piston 202 will move from the rightmost end as shown in fig. 2B to the leftmost end as shown in fig. 2C, or from the leftmost end as shown in fig. 2C to the rightmost end as shown in fig. 2B. During both movements, the piston 202 will pass through the position shown in fig. 2A. If the high-pressure control air supply 120 and the low-pressure control air supply 121 of the present application are not included in the air conditioning system, but directly connects the high-voltage conduction tube 125 of the switching device 103 to the high-voltage side of the air conditioning system, and the low pressure conduction pipe 126 of the switching device 103 is connected to the low pressure side of the air conditioning system, which is controlled to communicate with the first control chamber 204 and the second control chamber 205, even if the pressure difference between the first control chamber 204 and the second control chamber 205 is sufficient to move the piston 202 from one end to the other end, the pressures on the high pressure side and the low pressure side of the air conditioning system are rapidly equalized by passing through the position shown in fig. 2A, resulting in the switching device 103 not providing a sufficient pressure differential to maintain the motion of the piston 202, the piston 202 may be left in the position shown in fig. 2A and may not continue to move, thereby causing the air conditioning system to fail to reverse.

By arranging the high-pressure control air source 120 and the low-pressure control air source 120 which are independent from the four connecting ports, the reversing valve system and the air conditioning system can not directly influence the pressure difference provided by the switching device 103 to the

control chambers

204 and 205 in the reversing valve system 100 even if the pressure in the high-pressure side or the low-pressure side of the air conditioning system fluctuates, so that the piston 202 can move to a specified position, and the reversing of the reversing valve system is ensured to be successful.

Specifically, with reference to fig. 1A-1C, when the air conditioning system is operating in a heating or cooling mode, the high pressure control air supply 120 is in communication with the high pressure side of the air conditioning system to maintain a higher pressure, the low pressure control air supply 121 is in communication with 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 to remain stationary.

The reversing valve system 100 operates similarly when the air conditioning system switches from the cooling mode to the heating mode or from the heating mode to the cooling mode, and will be described in detail below with reference to the switching of the air conditioning system from the cooling mode to the heating mode.

When the air conditioning system is switched from the cooling mode to the heating mode, the switching device 103 receives an electromagnetic signal. The switching device 103 switches from communicating the high-pressure control gas source 120 with the first control chamber 204 to communicating the high-pressure control gas source 120 with the second control chamber 205, and simultaneously switches from communicating the low-pressure control gas source 121 with the second control chamber 205 to communicating the low-pressure control gas source 121 with the first control chamber 204. At this time, the pressure or gas refrigerant in the first control chamber 204 is discharged to the low-pressure control gas source 121 through the switching device 103, causing the pressure in the first control chamber 204 to decrease; and the high-pressure gas refrigerant in the high-pressure control gas source 120 is discharged into the second control chamber 205 through the switching device 103, raising the pressure in the second control chamber 205. The pressure differential in the first control chamber 204 and the second control chamber 205 forces the piston 202 to move from the rightmost end to the left as viewed in fig. 2B. It should be noted that when 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 in the second control chamber 205), the first control valve 157 remains open, and the same second control valve 158 remains open.

When the piston 202 moves to the intermediate position as shown in fig. 2A, the four connection ports 111,112,113,114 communicate with each other through the first and second chambers 235,236, so that the pressure in the high-pressure connection port 111 is rapidly decreased and the pressure in the low-pressure connection port 112 is rapidly increased, and thus the pressure on the high-pressure side of the air conditioning system is rapidly decreased and the pressure on the low-pressure side of the air conditioning system is rapidly increased. When the pressure on the high pressure side of the air conditioning system decreases below the pressure of high pressure control gas supply 120, first control valve 157 closes, thereby maintaining a higher pressure in high pressure control gas supply 120, thereby enabling a higher pressure in second control chamber 205 as well. Likewise, when the pressure on the low pressure side of the air conditioning system increases above the pressure of the low pressure control gas supply 121, the second control valve 158 closes, thereby maintaining a lower pressure in the low pressure control gas supply 121, thereby enabling a lower pressure in the first control chamber 204 as well. The first control chamber 204 and the second control chamber 205 can continue to maintain the pressure difference, and the piston 202 can continue to move leftward until the piston isolation plate 231 is misaligned with the four connection ports, and the piston 202 reaches the leftmost end as shown in fig. 2C, so that the air conditioning system is switched to the heating mode.

Fig. 3A-3C are perspective views of an embodiment of the reversing valve system in fig. 2A, illustrating a specific manner in which the first partition 337 and the second partition 338 of the piston 202 are in pairs with four connection ports on the housing. Fig. 3B and 3C are cross-sectional views of the piston 202 and the four connecting ports on the housing, taken at two different positions along two sides of the piston isolating plate 331, wherein fig. 3B is used for illustrating a specific manner in which the first partition plate 337 communicates with the four connecting ports, and fig. 3C is used for illustrating a specific manner in which the second partition plate 338 communicates with the four connecting ports.

As shown in fig. 3A, a housing 301 is a specific structure of an embodiment of the reversing valve system in fig. 2A to 2C, and the housing 301 and four connection ports connected to the housing 301 are shown by dotted lines in order to show a piston 302 inside the housing 301. The reversing valve system comprises a shell 301, a left end plate 307 is arranged on the left side of the shell 301, a right end plate 308 is arranged on the right side of the shell 301, a containing cavity 310 is arranged in the shell 301, four connecting

ports

311, 312, 313 and 314 are arranged in the middle of the shell 301 at intervals of 90 degrees along the circumferential direction, a high-pressure connecting port 311 and a low-pressure connecting port 312 are oppositely arranged on the shell 301 in the up-and-down direction, and a first heat exchanger connecting port 313 and a second heat exchanger connecting port 314 are oppositely arranged on the shell 301 in the front-and-back direction.

The piston 302 is disposed in the chamber 310 and moves in a straight line left and right in the chamber 310. The piston 302 has a piston left end 317 and a piston right end 318, wherein the piston left end 317 and the housing left end plate 307 form a first control chamber 304 therebetween and the piston right end 318 and the housing right end plate 308 form a second control chamber 305 therebetween. The piston 302 includes a piston isolator 331 in the middle, a first chamber 335 between the piston left end 317 and the piston isolator 331, and a second chamber 336 between the piston right end 318 and the piston isolator 331. The first chamber 335 is provided with a first partition 337 inclined backward from top to bottom, and the second chamber 336 is provided with a second partition 338 inclined forward from top to bottom, as an example, the first partition 337 and the second partition 338 are arranged perpendicular to each other.

The reversing valve system further comprises 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 outside of the housing 301, for example, welded to the outside of the housing 301. The four-way pilot valve 303 has four conduits 325,326,327 and 328, with a first control conduit 327 communicating with the first control chamber 304 and a second control conduit 328 communicating with the second control chamber 305. The high pressure conduit 325 is adapted to communicate with the high pressure control gas source 120 and the low pressure conduit 326 is adapted to communicate with the low pressure control gas source 121. When the four-way pilot valve 303 communicates the high pressure control gas source 120 and the low pressure control gas source 121 with the first control chamber 304 or the second control chamber 305, respectively, there is a pressure differential between the first control chamber 304 or the second control chamber 305, thereby causing the piston 302 to move linearly side-to-side in the receiving chamber 310.

FIG. 3B shows a cross-sectional view taken along line A-A of FIG. 3A to illustrate the first partition 337 in the first chamber 335 communicating the four connecting

ports

311, 312, 313 and 314 in pairs in a first manner; fig. 3C shows a cross-sectional view of fig. 3A taken along line B-B to illustrate that the second partition 338 in the second chamber 336 communicates the four

connection ports

311, 312, 313, and 314 in pairs in a second manner.

As shown in fig. 3B, the four

connection ports

311, 312, 313, and 314 communicate with the first chamber 335, the high-pressure connection port 311 communicates with the first heat exchanger connection port 313, and the low-pressure connection port 312 communicates with the second heat exchanger connection port 314.

As shown in fig. 3C, the four

connection ports

311, 312, 313, and 314 are also communicated with the second chamber 336, the high-pressure connection port 311 is communicated with the second heat exchanger connection port 314, and the low-pressure connection port 312 is communicated with the first heat exchanger connection port 313.

Therefore, in the state shown in fig. 3A, the high-pressure connection port 311 and the first and second heat

exchanger connection ports

313 and 314 are all communicated, and the low-pressure connection port 312 and the first and second heat

exchanger connection ports

313 and 314 are all communicated, so that the four

connection ports

311, 312, 313 and 314 are all communicated with each other.

Fig. 4A and 4B are specific structural schematic diagrams of the switching device of fig. 3A, in which a specific structure of the four-way pilot valve 303 is shown to illustrate a specific structure in which the four-way pilot valve 303 provides a pressure difference between a first chamber and a second chamber to control the movement of a piston in the reversing valve system. In which fig. 4A and 4B are shown in cross-section for the purpose of illustrating the internal structure of the four-way pilot valve 303. Note that, in fig. 4A and 4B, the solenoid-operated partial structure is omitted, and only the valve body partial structure of the four-way pilot valve 303 is shown.

As shown in fig. 4A and 4B, the four-way pilot valve 303 has a housing 441, and four conduction pipes 325,326,327, and 328 are connected to the housing 441, wherein the high-pressure conduction pipe 325 is provided at an upper portion of the housing 441, and the low-pressure conduction pipe 326, the first control conduction pipe 327, and the second control conduction pipe 328 are provided side by side at a lower portion of the housing 441.

Also included within the housing 441 is a plunger rod 442, the plunger rod 442 being driven by an electromagnetic signal (not shown) to move left and right within the housing 441, fig. 4A showing the plunger rod 442 in a rightmost position, and fig. 4B showing the plunger rod 442 in a leftmost position. The piston rod 442 has a piston cavity 445 therein, the piston cavity 445 being in communication with the high pressure conduit 325, and the piston cavity 445 also being capable of communicating with one of the first control conduit 327 or the second control conduit 328 when the piston rod 442 is in different positions.

The piston cavity 445 includes an upwardly domed cover 448 therein, the cover 448 dividing the piston cavity 445 into two-

part passages

446 and 449 inside the cover 448 and outside the cover 448. Wherein a passage 446 inside the cover 448 is capable of communicating the low pressure conduit 326 with one of the first control conduit 327 or the second control conduit 328, and a passage 449 outside the cover 448 is capable of communicating the high pressure conduit 325 with the other of the first control conduit 327 or the second control conduit 328.

In the state of the four-way pilot valve 303 as shown in fig. 4A, the low pressure conduit 326 and the second control conduit 328 communicate through the passage 446, and the high pressure conduit 325 and the first control conduit 327 communicate through the passage 449; in the state shown in fig. 4B, the four-way pilot valve 303 has the low-pressure conduit 326 and the first control conduit 327 communicating through the passage 446, and the high-pressure conduit 325 and the second control conduit 328 communicating through the passage 449.

Thus, the four-way pilot valve 303 is capable of selectively communicating the high pressure control gas source 120 with one of the first and

second control chambers

204, 205 and the low pressure control gas source 121 with the other of the first and

second control chambers

204, 205.

Fig. 5 is a block diagram of another embodiment of an air conditioning system including the reversing valve system of fig. 2A, which in this embodiment is also a four-way reversing valve. In the embodiment shown in fig. 5, the high pressure controlled gas source comprises a medium pressure tank 520. Also, for more clarity of illustration, in the embodiment shown in fig. 5, one of the refrigerant circulation circuits of the air conditioning system 550 is shown.

Specifically, as shown in fig. 5, the air conditioning system 550 is substantially identical in structure to the air conditioning system 150, except that the air conditioning system 550 includes an intermediate pressure tank 520, the intermediate pressure tank 520 having a gas inlet 520a, a gas outlet 520b, and a liquid outlet 520 c. Wherein the gas inlet 520a communicates with the discharge end 151a of the compressor 151 through the first control valve 157 (i.e., the first check valve 157) to receive the high-pressure gas refrigerant discharged from the discharge end 151a of the compressor 151. The gas outlet 520b communicates with the high pressure conduction pipe 125 of the switching device 103 (i.e., the four-way pilot valve) to introduce the high pressure gas refrigerant discharged from the gas outlet 520b into the first control chamber or the second control chamber (not shown in the drawings) of the four-way valve system. The liquid outlet 520c communicates with a low pressure side of the air conditioning system 550, for example, an outlet of the throttling device 152, to supplement the air conditioning system 550 with the liquid refrigerant stored in the medium pressure tank 520.

In the present embodiment, the medium-pressure tank 520 is a commonly used component in an air conditioning system, and has many functions in the air conditioning system, such as temporarily storing refrigerant when the pressure of the air conditioning system is too high, and supplementing refrigerant to the air conditioning system when the refrigerant in the air conditioning system is insufficient, and the like. Therefore, the medium pressure tank 520 is controllably connected to the high pressure side of the air conditioning system, so that the medium pressure tank 520 can be used as the high pressure control air source without additionally providing a container as the high pressure control air source.

In addition, by controlling the pipe diameter of the connection pipe connecting the gas inlet 520a of the middle pressure tank 520 and the discharge end 151a of the compressor 151, only a small amount of high pressure gas refrigerant discharged from the discharge end 151a of the compressor 151 can flow into the middle pressure tank 520 through the gas inlet 520a for providing a pressure difference between the first control chamber and the second control chamber, and 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.

Fig. 6 is a block diagram of another embodiment of an air conditioning system including the reversing valve system of fig. 2A, which in this embodiment is also a four-way reversing valve. In the embodiment shown in fig. 6, the high pressure controlled gas source comprises a storage tank 620. Wherein, for clarity, one of the refrigerant circulation circuits of the air conditioning system 650 is shown in the embodiment shown in fig. 6.

Specifically, as shown in fig. 6, the air conditioning system 650 has substantially the same structure as the air conditioning system 150, except that the air conditioning system 650 includes an oil tank 620, the oil 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 651 d. Wherein the inlet 620a communicates with an oil outlet 651c of the compressor 151 through the first control valve 157 (i.e., the first check valve 157) to receive oil discharged from the oil outlet 651c of the compressor 151 and entrained high-pressure gas refrigerant. The gas outlet 620b communicates with the high pressure conductance pipe 125 of the switching device 103 (i.e., the four-way pilot valve) to introduce the high pressure gas refrigerant discharged from the gas outlet 620b into the first control chamber or the second control chamber (not shown in the drawings) of the four-way valve system. The oil outlet 620c communicates with an oil return port 651d of the compressor 151 to supplement the oil stored in the oil tank 620 to the compressor 151.

In the present embodiment, the oil storage tank 620 is a common part in an air conditioning system, and oil discharged from the oil separation system of the compressor 151 and entrained high-pressure gas refrigerant flow into the oil storage tank 620 through the oil outlet 651c of the compressor 151 and the inlet 620a of the oil storage tank 620. The oil has a high density and thus can sink to the bottom of the oil storage tank 620 to be stored, and when a certain amount is reached, the stored oil is returned to the compressor 151 through the oil outlet 620c of the oil storage tank 620 and the oil return port 651d of the compressor 151. The high-pressure gas refrigerant contained in the oil storage tank 620 has a low density and can be discharged from the gas outlet 620b of the oil storage tank 620. Since the high-pressure gas refrigerant is discharged from the oil outlet 651c of the compressor 151, the oil reservoir 620 may be used as the high-pressure control gas source in this embodiment without providing a separate tank as the high-pressure control gas source.

The oil discharged from the oil outlet 651c of the compressor 151, with only a small amount of high-pressure gas refrigerant entrained therein, flows into the oil storage tank 620 through the inlet 620a together with the oil for providing a pressure difference between the first control chamber and the second control chamber, and most of the high-pressure gas refrigerant is discharged from the discharge 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.

Fig. 7 is a perspective view of an embodiment of a high pressure controlled gas source in the reversing valve system of fig. 2A, illustrating the specific structure of an embodiment of the high pressure controlled gas source.

As shown in fig. 7, the high-pressure control gas source includes a high-pressure energy storage tank 720, and the high-pressure energy storage tank 720 is a closed tank-shaped container and is used for containing high-pressure gas refrigerant inside. The high-pressure energy storage tank 720 is provided at the top with an inlet 720a and at the bottom with an outlet 720b, the inlet 720a and the outlet 720b communicating with the interior of the high-pressure energy storage tank 720, so that high-pressure gas refrigerant can flow into the high-pressure energy storage tank 720 from the inlet 720a and high-pressure gas refrigerant can flow out from the outlet 720 b.

Wherein, the inlet 720a of the high pressure energy storage tank 720 is used to connect with the discharge end 151A of the compressor 151 through the first control valve 157 (see fig. 1A-1C) to unidirectionally receive the high pressure gas refrigerant from the discharge end 151A of the compressor, but not to discharge the 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 adapted to be connected to the high pressure conducting tube 125 of the switching device 103 (see fig. 1A-1C, i.e., the four-way pilot valve 303 of fig. 3A).

The top of the high-pressure energy storage tank 720 is further provided with a maintenance port 733, and a control valve can be further arranged at the maintenance port 733, so that the maintenance port 733 can be controllably connected with an external air source, and therefore pressure is provided for the high-pressure energy storage tank 720 through the external air source, and further pressure is provided for the control chamber.

As an example, when the reversing valve system fails to reverse, the piston stays at the neutral position (as shown in fig. 2A), resulting in the air conditioning system needing to be shut down for maintenance, pressure may also be provided to the high pressure storage tank 720 through the maintenance port 733, and thus to the control chamber, so that the piston moves away from the neutral position to a designated position to complete the reversing of the reversing valve system. At this time, the reversing valve system can be reversed without removing all the pipes of the reversing valve system and the air conditioning system and without discharging the refrigerant.

Fig. 8A and 8B are schematic structural views of another embodiment of the reversing valve system according to fig. 2A, illustrating a specific structure in which a high-pressure control air source is integrally disposed on a connecting port of a housing. Wherein fig. 8B is a sectional view of fig. 8A, the sectional plane being an axial section of the housing of fig. 8A. It should be noted that, in the present embodiment, the reversing valve system only includes the high-pressure control gas source and does not include the low-pressure control gas source.

As shown in fig. 8A and 8B, the reversing valve system includes a housing 801, the housing 801 having a cylindrical shape, a first heat exchanger connection port 813 on the front side of the housing 801, a second heat exchanger connection port 814 on the rear side, a high pressure connection port 811 on the upper side, and a low pressure connection port 812 on the lower side. The left end of the housing 801 is provided with a left end plate 807, and the right end is provided with a right end plate 808.

The interior of the housing 801 also includes a piston 802, and the piston 802 reciprocates left and right within the interior of the housing 801. The piston 802 includes a left end 817 and a right end 818. A first control chamber 804 is formed between the piston left end 817 and the housing left end plate 807, and a second control chamber 805 is formed between the piston right end 818 and the housing right end plate 808.

The reversing valve system includes a four-way pilot valve 803, the four-way pilot valve 803 having four

conduits

825, 826, 827 and 828, with a first control conduit 827 communicating with the first control chamber 804 and a second control conduit 828 communicating with the second control chamber 805. The high pressure conduit 825 is adapted to communicate with the high pressure control gas source 820, and the low pressure conduit 826 is adapted to communicate with the low pressure connection port 812. It should be noted that, in the present embodiment, the low-pressure conduction pipe 826 is directly connected to the low-pressure connection port 812 without including the low-pressure control gas source. Since the low-pressure connection port 812 is for connection with the low-pressure side of the air conditioning system, the low-pressure conduction pipe 826 of the four-way pilot valve can also be connected to the low-pressure side of the air conditioning system.

The reversing valve system further comprises a high-pressure control gas source, in the embodiment shown in the present application, the high-pressure control gas source is a tubular container 820 with two closed ends, and the tubular container 820 is sleeved outside the high-pressure connecting port 811 on the housing 801, so that a control gas source accommodating 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 connection port 811 has an outer wall 885, and the interior of the outer wall 885 is used to form the conduit of the high-pressure connection port 811. The tubular container 820 has an outer wall 884 disposed around the outer wall 885 of the high-pressure connection port, the outer wall 884 of the tubular container being spaced a distance from the outer wall 885 of the high-pressure connection port to enable a controlled gas source volume 886 to be formed between the outer wall 884 of the tubular container and the outer wall 885 of the high-pressure connection port. Wherein upper end 887 and lower end 888 of tubular container 820 are attached to outer wall 885 of the high-pressure connection port, such as welded to outer wall 885, such that tubular container 820 is fixedly attached to high-pressure connection port 811, such that tubular container 820 is integrally disposed with housing 801 as a single piece, and such that control gas supply volume 886 is not in communication with the outside air.

Tubular container 820 has an inlet 820a and an outlet 820b and a service port 833 is provided in outer wall 884, wherein inlet 820a, outlet 820b and service port 833 are all in communication with controlled gas supply volume 886. The inlet 820a communicates with the inside of the outer wall 885 of the high-pressure connection port 811 through the check valve 857, and the outlet 820b communicates with the high-pressure conduction pipe 825 of the four-way pilot valve. Since the high-pressure connection port 811 is for connection with the high-pressure side of the air conditioning system, i.e., the inlet 820a of the tube-shaped container can also be controllably connected to the high-pressure side of the air conditioning system. It should be noted that although the tubular container 820 is in communication with the high-pressure connection port 811, it is not in direct communication but is in controllable fluid communication through the one-way control valve 857, so that it is possible to ensure that the high-pressure gas refrigerant flows into the tubular container 820 through the high-pressure connection port 811, but the high-pressure gas refrigerant is prevented from flowing back from the tubular container 820 to the high-pressure connection port 811. The high pressure gas refrigerant in the tube 820 can only flow out of the outlet 820b through the four-way pilot valve 803 into either the first control chamber 804 or the second control chamber 805.

It should be noted that the high-pressure control gas source provided as a tube container may be provided outside the outer wall of any one of the connection ports. In this embodiment, the tubular container 820 is disposed outside the high-pressure connection port 811, and can facilitate connection of the inlet 820a of the high-pressure control gas source with the high-pressure connection port 811.

Fig. 9 is a schematic structural view of another embodiment of the reversing valve system according to fig. 2A, illustrating a specific structure in which a low-pressure control air source is integrally provided on a connection port of a housing. It should be noted that, in the present embodiment, the reversing valve system only includes the low-pressure control gas source and does not include the high-pressure control gas source.

As shown in FIG. 9, the structure of the diverter valve system 900 is substantially similar to the structure of the diverter valve system 800, and like parts will not be described again. The reversing valve system 900 also includes a housing 901, and the housing 901 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. The left end of the casing 901 is provided with a left end plate 907, and the right end is provided with a right end plate 908. Although not shown, it should be understood that the reversing valve system 900 also includes a piston, also having two control chambers 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.

The reversing valve system 900 further comprises a four-way pilot valve 903, the four-way pilot valve 903 having four conducting

tubes

925, 926, 927 and 928, wherein a first control conducting tube 927 is adapted to communicate with a first control chamber (not shown), a second control conducting tube 928 is adapted to communicate with a second control chamber (not shown), the high pressure conducting tube 925 is adapted to communicate with the high pressure connection port 911, and the low pressure conducting tube 926 is adapted to communicate with a low pressure control gas source.

The diverter valve system 900 differs from the diverter valve system 800 in that the high pressure control gas source is not included in the diverter valve system 900, but rather a low pressure control gas source. Specifically, the low pressure control gas source is a tubular container 921 with two closed ends, the structure of the tubular container 921 is similar to that of the tubular container 820, but the tubular container 921 surrounds and is sleeved outside the low pressure connection port 912 to form a cavity (not shown) with the low pressure connection port 912, and the tubular container 921 and the housing 901 are integrally arranged to form a single piece.

The tube container 921 has an inlet 921a and an outlet 921b, wherein the inlet 921a communicates with a low pressure conduction pipe 926 of the four-way pilot valve, and the outlet 921b communicates with the low pressure connection port 912 through a one-way control valve 958. Since the low pressure connection port 912 is for connection to the low pressure side of the air conditioning system, the 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 although the tubular container 921 is in communication with the low-pressure connection port 912, it is not in direct communication but is in controllable fluid communication through the one-way control valve 958, so that the pressure or gas refrigerant in the tubular container 921 can flow into the low-pressure connection port 912 but is prevented from flowing back into the tubular container 921 from the low-pressure connection port 912. Also, the tube 921 can only flow pressure or gas refrigerant from the first control chamber or the second control chamber (not shown in the figure) through the four-way pilot valve 903.

It should be noted that the low-pressure control gas source provided as the tube container may be provided outside any one of the connection ports. In this embodiment, the tubular container 921 is provided outside the low-pressure connection port 912, and it is possible to facilitate connection of the inlet 921a of the low-pressure control gas source with the low-pressure connection port 912.

Fig. 10 shows a schematic structural view of another embodiment of the reversing valve system according to fig. 2A, for explaining a specific structure in which the high-pressure control gas source is integrally provided at the end of the housing. It should be noted that, in the present embodiment, the reversing valve system only includes the high-pressure control gas source and does not include the low-pressure control gas source.

As shown in fig. 10, the general structure of the reversing valve system 1000 is similar to the reversing valve system 800, and the same parts will not be described again. The reversing valve system 1000 also includes a housing 1001, and the housing 1001 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. The left end of the housing 1001 is provided with a left end plate 1007 and the right end is provided with a right end plate 1008. Although not shown, it should be understood that the reversing valve system 1000 also includes a piston, with two control chambers also 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.

The reversing valve system 1000 further includes a four-way pilot valve 1003, the four-way pilot valve 1003 having four

conduction pipes

1025, 1026, 1027 and 1028, wherein the first control conduction pipe 1027 is adapted to communicate with a first control chamber (not shown), the second control conduction pipe 1028 is adapted to communicate with a second control chamber (not shown), the high pressure conduction pipe 1025 is adapted to communicate with a high pressure control gas source, and the low pressure conduction pipe 1026 is adapted to communicate with the low pressure connection port 1012.

The reversing valve system 1000 further comprises a high pressure control gas source, which in this embodiment is a high pressure energy storage tank 1020 arranged as a can-shaped vessel, and the high pressure energy storage tank 1020 is connected to an end of the housing 1001, for example, welded or riveted to the right end plate 1008 of the housing 1001, such that the high pressure energy storage tank 1020 and the housing 1001 are integrally arranged as a single piece. Although not shown, it will be understood by those skilled in the art that the high pressure energy storage tank 1020 also has a cavity therein for containing high pressure gaseous refrigerant. The outer wall of the high-pressure energy storage tank 1020 is also provided with a maintenance port 1033, and the maintenance port 1033 is communicated with the accommodating cavity.

The high-pressure energy storage tank 1020 has an inlet 1020a and an outlet 1020b, wherein the inlet 1020a communicates with the high-pressure connection port 1011 through a one-way control valve 1057, and the outlet 1020b communicates with a high-pressure conduction pipe 1025 of the four-way pilot valve. It should be noted that although the high-pressure energy storage tank 1020 is in communication with the high-pressure connection port 1011, it is not in direct communication but is in controllable fluid communication by the one-way control valve 1057, so that it is possible to ensure that the high-pressure gas refrigerant flows into the high-pressure energy storage tank 1020 through the high-pressure connection port 1011, but to prevent the high-pressure gas refrigerant from flowing out of the high-pressure energy storage tank 1020 to return to the high-pressure connection port 1011. The high pressure gas refrigerant in the high pressure energy storage tank 1020 can only flow out of the outlet 1020b through the four-way pilot valve 1003 into the first control chamber or the second control chamber.

Because the high-pressure energy storage tank 1020 contains the refrigerant in a gas state, in order to avoid the influence on the normal operation of the pneumatic reversing valve system caused by the fact that the refrigerant is condensed from a gas state to a liquid state, an insulating layer can be further arranged outside the high-pressure energy storage tank 1020, and as an example, the outer side of the high-pressure energy storage tank 1020 is further wrapped by a layer of insulating cotton 1082.

Fig. 11 shows a schematic structural view of another embodiment of the reversing valve system according to fig. 2A, for explaining a specific structure in which a low pressure control air supply is integrally provided at an end portion of a housing. It should be noted that, in the present embodiment, the reversing valve system only includes the low-pressure control gas source and does not include the high-pressure control gas source.

As shown in fig. 11, the general structure of the reversing valve system 1100 is similar to that of the reversing valve system 1000, and the same parts are not described again. The reversing valve system 1100 also includes a housing 1101 and a four-way pilot valve, 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 provided on the housing 1101. The left end of the housing 1101 is provided with a left end plate 1107, and the right end is provided with a right end plate 1108. The four-way pilot valve has four

conductance tubes

1125, 1126, 1127, and 1128.

The diverter valve system 1100 differs from the diverter valve system 1000 in that it does not include a high pressure control gas source and includes a low pressure control gas source. In this embodiment, the low pressure control air source is a low pressure surge tank 1121, and the low pressure surge tank 1121 is a tank-shaped container similar to the high pressure energy storage tank 1020, is connected to the right end plate 1108 of the housing 1001, has a cavity inside, 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, wherein the inlet 1121a communicates with a low pressure conduction pipe 1126 of the four-way pilot valve, and the outlet 1121b communicates with the low pressure connection port 1112 through the check valve 1158. The low-pressure surge tank 1121 is also wrapped with a layer of heat-insulating cotton 1182.

Fig. 12 shows a schematic structural view of another embodiment of the reversing valve system according to fig. 2A, for explaining a specific structure in which the high-pressure control gas source and the low-pressure control gas source are integrally provided on the housing. It should be noted that, in the present embodiment, the reversing valve system includes both the high-pressure control gas source and the low-pressure control gas source.

As shown in fig. 12, the directional valve system 1200 is similar to the directional valve system 800, including a tubular container 1220 as a high pressure control gas source, and is also similar to the directional valve system 1100, including a low pressure surge tank 1221 as a low pressure control gas source, wherein the same parts are not described again. The reversing valve system 1200 also includes a housing having a high pressure connection 1211, a low pressure connection 1212, a first heat exchanger connection 1213 and a second heat exchanger connection 1214, and a four-way pilot valve. 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

conduction tubes

1225, 1226, 1227, and 1228.

The tubular container 1220 surrounds and is sleeved outside the high-pressure connecting port 1211, a cavity is formed between the tubular container 1220 and the high-pressure connecting port 1211, and the tubular container 1220 and the shell are integrally arranged to form a single piece. The tube-shaped container 1220 has an inlet 1220a and an outlet 1220b, the inlet 1220a communicates with the high-pressure connection port 1211 through the one-way control valve 1257, and the outlet 1220b communicates with the high-pressure conduction pipe 1225 of the four-way pilot valve.

A low pressure surge tank 1221 is attached to the housing right end plate 1208, has a volume therein, and is integrally formed as a single piece with the housing. The low-pressure surge tank 1221 also has an inlet 1221a and an outlet 12121b, wherein the inlet 1221a communicates with a low-pressure conducting pipe 1226 of the four-way pilot valve, and the outlet 1221b communicates with the low-pressure connecting port 1212 through the check valve 1258.

In the embodiment of this application, high pressure control air supply and low pressure control air supply all can set up the tip at the casing, for example connect on the left end board or the right end board of casing, also can set up in the connector outside of casing, for example encircle and establish the outside at high pressure connector or low pressure connector, can both make high pressure control air supply and low pressure control air supply and casing as whole setting.

Fig. 13A-13C show block diagrams of another embodiment of an air conditioning system 1350 in which the reversing valve system 1300 is a three-way reversing valve. In which fig. 13A shows a connection structure of an air conditioning system 1350, and fig. 13B and 13C show two

refrigerant circulation circuits

1360 and 1370 of the air conditioning system 1350, respectively.

As shown in fig. 13A, in comparison with air conditioning system 150, air conditioning system 1350 includes, in addition to compressor 1351, first heat exchanger 1353, second heat exchanger 1354, throttling device 1352, switching device 103, and high pressure control gas source 120, a third heat exchanger 1355, which are connected by piping to form a closed system and which is filled with refrigerant. Also, air conditioning system 1350 further includes a reversing valve system 1300, where reversing valve system 1300 can control the operation of first heat exchanger 1353 and third heat exchanger 1355 for communication with refrigerant circulation circuit 1360 as shown in fig. 13B, or control the operation of second heat exchanger 1354 and third heat exchanger 1355 for communication with refrigerant circulation circuit 1370 as shown in fig. 13C.

As shown in fig. 13A, similar to air conditioning system 150, compressor 1351 includes a discharge end 1351a and a suction end 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 gas source 120 includes an inlet 120a and an outlet 120 b. And unlike the air conditioning system 150, the third heat exchanger 1355 includes

ports

1355a and 1355b and the reversing valve system 1300 does not include a low pressure port and includes a high pressure port 1311, a first heat exchanger port 1313, and a third heat exchanger port 1314. In this embodiment, the reversing valve system 1300 may be configured substantially the same as that shown in FIG. 2A, except that it does not include a low pressure connection port.

It should be noted that although the reversing valve system 1300 does not include the low-pressure connection port, the high pressure in the high-pressure control air source 120 and the low pressure on the suction side of the air conditioning system (i.e., on the side of the suction end 1351B) can be connected to two control chambers (not shown) of the reversing valve system 1300 by the switch device 103, and the piston in the reversing valve system 1300 is controlled to reciprocate, thereby communicating at least two openings in the reversing valve system 1300, so that the air conditioning system 1350 forms a refrigerant circulation loop as shown in fig. 13B or 13C.

Specifically, the high pressure connection port 1311 of the reversing valve system 1300 is connected to the discharge end 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, and 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. A connection port 1353a of the first heat exchanger 1353 is connected to a connection port 1352a of the throttle device 1352, and a connection port 1352a of the throttle device 1352 is also connected to a connection port 1355a of the third heat exchanger 1355. A connection port 1352b of the throttling device 1352 is connected to a connection port 1354a of the second heat exchanger 1354, and a connection port 1354b of the second heat exchanger 1354 is connected to a suction end 1351b of the compressor 1351. The connection structure of the switching device 103 and the high-pressure control air supply 120 is the same as that of the air conditioning system 150, and will not be described in detail. It should be noted that in the air conditioning system 1350 of the present embodiment, the low pressure control air source is not included, so the low pressure conduction pipe 126 of the switch device 103 can be directly connected to the suction end 1351b of the compressor 1351.

As an example, the first heat exchanger 1353 is a wind side heat exchanger, the second heat exchanger 1354 and the third heat exchanger 1355 are water side heat exchangers, and the second heat exchanger 1354 and the third heat exchanger 1355 are used for connecting with a water supply and return pipe, so that the second heat exchanger 1354 and the third heat exchanger 1355 can provide heat or cold required by a user side when operating.

As shown in fig. 13B, 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 time, the high-pressure gas refrigerant discharged from the discharge end 1351a of the compressor 1351 flows into the first heat exchanger 1353, releases heat in the first heat exchanger 1353 to be condensed into a high-pressure liquid refrigerant, then flows into the throttling device 1352, is throttled into a low-pressure liquid refrigerant, then flows into the second heat exchanger 1354, absorbs heat in the second heat exchanger 1354 to be evaporated into a low-pressure gas refrigerant, and finally flows into the suction end 1351b of the compressor 1351, completing the refrigerant cycle. At this time, the second heat exchanger 1354 absorbs heat of the user side, and thus can cool the outside, and the air conditioning system is in a cooling mode. At this time, since the third heat exchanger connection port 1314 of the direction change valve system 1300 is not communicated, the third heat exchanger 1355 is not connected to the refrigerant circulation circuit 1360.

As shown in fig. 13C, the high-pressure connection port 1311 of the reversing valve system 1300 is in fluid communication with 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 end 1351a of the compressor 1351 flows into the third heat exchanger 1355, releases heat in the third heat exchanger 1355 to be condensed into a high-pressure liquid refrigerant, then flows into the throttling device 1352, is throttled into a low-pressure liquid refrigerant, then flows into the second heat exchanger 1354, absorbs heat in the second heat exchanger 1354 to be evaporated into a low-pressure gas refrigerant, and finally flows into the suction end 1351b of the compressor 1351, completing the refrigerant cycle. At this time, the third heat exchanger 1355 releases heat to the user side, thus heating the outside, and the second heat exchanger 1354 absorbs heat of the user side, thus cooling the outside, thereby putting the air conditioning system in a heat recovery mode. At this time, since the first heat exchanger connection port 1313 of the direction valve system 1300 is not connected, the first heat exchanger 1353 is not connected to the refrigerant circulation circuit 1370.

Therefore, the reversing valve system is not only suitable for the four-way reversing valve, but also suitable for the three-way reversing valve, and only needs to be a pneumatic reversing valve. The three-way selector valve of the present embodiment differs from the four-way selector valve of fig. 2A only in that the housing 201 does not have a low-pressure connection port, and the piston 202 and other parts of the housing 201 have the same configuration as the four-way selector valve of fig. 2A.

Since the three-way selector valve does not have a low-pressure connection port, when the piston is in the intermediate position as shown in fig. 2A, the high-pressure connection port 1311, the first heat exchanger connection port 1313, and the third heat exchanger connection port 1314 may communicate with each other to cause a fluctuation in pressure in the high-pressure side of the air conditioning system (i.e., a decrease in pressure in the high-pressure side of the air conditioning system). By providing the high pressure control air source 120, the pressure in the high pressure conduction pipe 125 of the switch device 103 can be maintained for a certain period of time, so that the pressure difference between the high pressure conduction pipe 125 and the low pressure conduction pipe 126 is maintained, namely the pressure difference between the two control chambers of the piston is maintained, therefore, the piston can move to a designated position, and the reversing success of the air conditioning system is ensured.

Although the present application will be described with reference to the particular embodiments shown in the drawings, it should be understood that the reversing valve system of the present application can take many forms without departing from the spirit and scope of the teachings of the present application. Those of ordinary skill in the art will also realize that there are different ways of varying the details of the structures in the embodiments disclosed in this application that fall within the spirit and scope of the application and the claims.

Claims

1. A reversing valve system, characterized by: the reversing valve system (100) comprises:

a housing (201), said housing (201) having a cavity (210), said housing (201) having at least three openings (111,112,113,114) therein, said openings being in fluid communication with said cavity (210), said housing (201) having opposing left and right end plates (207, 208);

a piston (202), said piston (202) being mounted within said cavity (210) of said housing (201) and being reciprocally movable within said cavity (210), the reciprocal movement of said piston (202) being capable of selectively communicating with at least one pair of said at least three openings (111,112,113,114), said piston (202) having opposite first and second ends (217, 218), said first and second ends (217, 218) being configured to match the shape of said cavity (210) such that a first control chamber (204) is formed between said first end (217) of said piston (202) and said left end plate (207) of said housing (201) and a second control chamber (205) is formed between said second end (218) of said piston (202) and said right end plate (208) of said housing (201); and

a switching device (103), said switching device (103) being configured to be connectable to a control gas source (120,121), said switching device (103) being capable of selectively placing said control gas source (120,121) in fluid communication with said first control chamber (204) or said control gas source (120,121) in fluid communication with said second control chamber (205) such that said piston (202) is capable of remaining stationary or reciprocating within said volume (210) of said housing (201) to selectively communicate with at least one pair of said at least three openings (111,112,113, 114);

wherein the at least three openings (111,112,113,114) are independent of the control gas source (120, 121).

2. The reversing valve system of claim 1, further comprising:

said piston (202) being provided with a piston spacer (231) between said first end (217) and said second end (218) thereof, said piston spacer (231) dividing said piston (202) and said housing (201) into a first chamber (235) and a second chamber (236), said first chamber (235) being provided with a first partition (337) inclined at a first angle, said second chamber (236) being provided with a second partition (338) inclined at a second angle, said piston spacer (231) being arranged with an outer contour matching the shape of said receptacle (210) such that said first chamber (235) and said second chamber (236) are isolated from each other when said piston spacer (231) and said four openings (111,112,113,114) are misaligned;

wherein the at least three openings (111,112,113,114) communicate with at least one pair of openings in a first manner when the at least three openings (111,112,113,114) are located in the first cavity (235); when the at least three openings (111,112,113,114) are located in the second chamber (236), the at least three openings (111,112,113,114) communicate with at least one pair of openings in a second manner.

3. The reversing valve system of claim 2, further comprising:

the at least three openings (111,112,113,114) comprise 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;

wherein the four openings (111,112,113,114) form a first manner of pair-wise communication when the four openings (111,112,113,114) are located in the first cavity (235); the four openings (111,112,113,114) form a second manner of pair-wise communication when the four openings (111,112,113,114) are located in the second chamber (236).

4. The reversing valve system of claim 3, further comprising:

the diverter valve system (100) includes the control gas source (120,121), the control gas source (120,121) including at least one of a high pressure control gas source (120) and a low pressure control gas source (121);

the four openings (111,112,113,114) including a high pressure connection port (111) and a low pressure connection port (112), the high pressure connection port (111) for fluid communication with a high pressure side of an air conditioning system, the low pressure connection port (112) for fluid communication with a low pressure side 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 of claim 4, further comprising:

the control gas source (120,121) comprises a high pressure control gas source (120), the high pressure control gas source (120) having an inlet (120a) and an outlet (120 b);

the inlet (120a) of the high pressure control air supply (120) is for controllable fluid communication with a high pressure side of the air conditioning system, and the outlet (120b) of the high pressure control air supply (120) is in fluid communication with the switching device (103).

6. The reversing valve system of claim 4, further comprising:

the control gas source comprises a low-pressure control gas source (121), the low-pressure control gas source (121) having an inlet (121a) and an outlet (121 b);

the inlet (121a) of the low pressure control air supply (121) is in fluid communication with the switching device (103), and the outlet (121b) of the low pressure control air supply (121) is for controllable fluid communication with a low pressure side of the air conditioning system.

7. The reversing valve system of claim 4, further comprising:

the control gas source comprises a high-pressure control gas source (120) and a low-pressure control gas source (121), the high-pressure control gas source (120) is provided with an inlet (120a) and an outlet (120b), and the low-pressure control gas source (121) is provided with an inlet (121a) and an outlet (121 b);

the inlet (120a) of the high pressure control air supply (120) is for controllable fluid communication with a high pressure side of the air conditioning system, the outlet (120b) of the high pressure control air supply (120) is in fluid communication with the switching device (103);

8. The reversing valve system of claim 5 or 7, further comprising: the reversing valve system (100) further comprises:

a first control valve (157), the inlet (120a) of the high pressure control gas source (120) being in controllable fluid communication with the high pressure connection port (111) of the housing (201) through the first control valve (157).

9. The reversing valve system of claim 6 or 7, further comprising: the reversing valve system (100) further comprises:

a second control valve (158), the outlet (121b) of the low pressure control gas source (121) being controllably in fluid communication with the low pressure connection port (112) of the housing (201) through the second control valve (158).

10. The reversing valve system of claim 1, further comprising:

the switching device (103) is a four-way pilot valve (303), the four-way pilot valve (303) is provided with four pilot valve conducting pipes (325,326,327,328), and the four pilot valve conducting pipes (325,326,327,328) comprise 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 conduit (325) and the low pressure conduit (326) is for fluid communication with the control gas source (120,121), the first control conduit (327) is for fluid communication with the first control chamber (204), and the second control conduit (328) is 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 of claim 1, further comprising:

the cavity (210) is cylindrical in shape.

12. The reversing valve system of claim 1, further comprising:

the control gas source (120,121) is a closed pot-shaped container (720).

13. The reversing valve system of claim 1, further comprising:

the control air source (120,121) is integrally arranged on the shell (201).

14. The reversing valve system of claim 1, further comprising:

the control gas source (120,121) has a service port (733,833,1033), the service port (733,833,1033) for controllably connecting or disconnecting an external gas source.

15. The reversing valve system of claim 13, further comprising:

the control gas source (120,121) is a closed canister (1020,1121,1221), the canister (1020,1121,1221) being fixedly attached to at least one of a left end plate (1007,1107,1207) and a right end plate (1008,1108,1208) of the housing (1001) such that the control gas source (120,121) is integrally provided with the housing (1001) as a single piece.

16. The reversing valve system of claim 13, further comprising:

the control air source (120,121) is a closed tubular container (820,921,1220), the tubular container (820,921,1220) is sleeved outside at least one opening (811,912,1211) of the four openings of the housing (801,901), and a control air source accommodating cavity (886) is formed between the tubular container (820,921,1220) and the at least one opening (811,912,1211) of the four openings, so that the control air source (120,121) and the housing (801,901) are integrally arranged to form a single piece.

17. An air conditioning system characterized by: 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 circulation circuit (160) of refrigerant and a second circulation circuit (170) of refrigerant;

the air conditioning system (150) further comprises a reversing valve system (100) according to any of claims 1-16, the reversing valve system (100) controlling the air conditioning system (150) to communicate with the refrigerant first circulation circuit (160) or the refrigerant second circulation circuit (170).

18. The air conditioning system of claim 17, wherein:

the at least two heat exchangers (153,154) comprise 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 connected in sequence 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 connected in sequence to form a second refrigerant circulation loop (170); the compressor (151) having a suction end (151b) and a discharge end (151 a);

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 discharge end (151a) of the compressor (151), the low pressure connection port (112) is in fluid communication with the suction 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 a first working position, the air conditioning system (150) is communicated with the refrigerant first circulation circuit (160), and when the piston (202) moves to a second working position, the air conditioning system (150) is communicated with the refrigerant second circulation circuit (170).

19. The air conditioning system of claim 17, wherein:

the at least two heat exchangers (1353,1354,1355) comprise 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 connected in series to form a first refrigerant circulation circuit (1360), and the compressor (151), the third heat exchanger (1355), the throttling device (1352) and the second heat exchanger (1354) are connected in series to form a second refrigerant circulation circuit (1370); the compressor (1351) having a suction end (1351b) and a discharge end (1351 a);

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 discharge 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);

the air conditioning system (1350) communicates with the refrigerant first circulation circuit (1360) when the piston is moved to the first operating position, and the air conditioning system (1350) communicates with the refrigerant second circulation circuit (1370) when the piston is moved to the second operating position.

20. An air conditioning system as claimed in claim 18 or 19, wherein:

the air conditioning system (150) comprises the control air supply (120,121), the control air supply (120,121) comprises a high pressure control air supply (120), the high pressure control air supply (120) has an inlet (120a) and an outlet (120b), the inlet (120a) of the high pressure control air supply (120) is controllably in fluid communication with the discharge end (151a) of the compressor (151), and the outlet (120b) of the high pressure control air supply (120) is in fluid communication with the switching device (103).

21. The air conditioning system of claim 18, wherein:

the air conditioning system (150) comprises the control air supply (120,121), the control air supply (120,121) comprises a low pressure control air supply (121), the low pressure control air supply (121) has an inlet (121a) and an outlet (121b), the inlet (121a) of the low pressure control air supply (121) is in fluid communication with the switch device (103), and the outlet (121b) of the low pressure control air supply (121) is in controllable fluid communication with the suction end (151b) of the compressor (151).

22. The air conditioning system of claim 20, wherein:

the high pressure control gas source (120) comprises an intermediate pressure tank (520), the intermediate pressure tank (520) having a gas inlet (520a), a gas outlet (520b) and a liquid outlet (520 c);

wherein the gas inlet (520a) of the medium pressure tank (520) is in controllable fluid communication with the discharge end (151a) of the compressor (151), the gas outlet (520b) of the medium pressure tank (520) is in fluid communication with the switching device (103), and the liquid outlet (520c) of the medium pressure tank (520) is in controllable fluid communication with an outlet side of the throttling device (152) of the air conditioning system (150).

23. The air conditioning system of claim 20, wherein:

the high-pressure control gas source (120) comprises an oil storage tank (620), the oil storage tank (620) is provided with an inlet (620a), a gas outlet (620b) and an oil outlet (620c), and the compressor (151) is provided with an oil outlet (651c) and an oil return port (651 d);

wherein said inlet (620a) of said oil storage tank (620) is in controllable fluid communication with said oil outlet (651c) of said compressor (151), said gas outlet (620b) of said oil storage tank (620) is in fluid communication with said switching device (103), said oil outlet (620c) of said oil storage tank (620) is in controllable fluid communication with said oil return (651d) of said compressor (151).