WO2022042101A1

WO2022042101A1 - Four-way main valve, four-way reversing valve assembly, and air conditioning unit

Info

Publication number: WO2022042101A1
Application number: PCT/CN2021/106127
Authority: WO
Inventors: 韩润虎; 金华海
Original assignee: 浙江盾安人工环境股份有限公司
Priority date: 2020-08-26
Filing date: 2021-07-13
Publication date: 2022-03-03
Also published as: CN213685381U

Abstract

Provided are a four-way main valve (100), a four-way reversing valve assembly (10), and an air conditioning unit; the four-way main valve (100) comprises a cylinder body (110) and a reversing piston (120); a first air chamber (102) and a second air chamber (104) in the cylinder body (110) are in communication with an air inlet duct (111) by means of a ventilation groove (112) at the same end of the cylinder body (110); when reversing, the reversing piston (120) must be pushed to the other side. Since the first air chamber (102) and the second air chamber (104) are both in communication with the corresponding air inlet duct (111) by means of the ventilation groove (112) on the inner wall of the cylinder body (110); therefore, when performing a reversal operation, the high-pressure air in a pilot valve (200) can pass through the corresponding air inlet duct (111) and ventilation groove (112) and directly enter the first air chamber (102) or the second air chamber (104), thereby pushing the reversing piston (120) to move. The high-pressure gas in the pilot valve (200) does not need to be transferred by means of the flow channel in the middle of the reversing piston (120), and the reversing piston (120) does not need to be additionally provided with a flow channel and a flow-channel switching mechanism.

Description

Four-way main valve, four-way reversing valve assembly and air conditioning unit

technical field

The present application relates to the technical field of air conditioners, and in particular, to a four-way main valve, a four-way reversing valve assembly and an air conditioner unit.

Background technique

The four-way reversing valve assembly is composed of a main valve and a pilot valve that controls the reversing of the main valve, and the main valve is mainly composed of a cylinder and a reversing piston. Both ends of the cylinder body are sealed with end caps, and the side wall of the cylinder body is provided with a plurality of main valve ports. The air inlets and air outlets of the condenser, the evaporator and the compressor are respectively connected to different main valve ports. By sliding along the cylinder, the reversing piston can switch the communication state of a plurality of different main valve ports, thereby changing the flow direction of the refrigerant and switching between cooling and heating.

In the existing four-way main valve, the reversing piston slides along the cylinder body, and its end faces are often in close contact with the inner sides of the end caps at both ends of the cylinder body. In this way, when the main valve needs to switch the communication state of each main valve port, the high-pressure gas in the high-pressure intake pipe needs to be introduced into the center of the piston through the flow channel set on the piston, and then passed through the flow channel set in the center of the piston and the corresponding flow channel. The conversion mechanism directs the high-pressure air flow to the corresponding chamber in order to push the piston. Then, when the piston moves through the hole connecting the pilot valve and the main valve, the high pressure gas can be introduced into the corresponding chamber through the pilot valve, so as to continue to push the piston to move until the direction change is realized.

It can be seen that, in order to achieve smooth reversing, more flow passages must be opened inside the reversing piston in the existing four-way main valve and a corresponding flow passage switching mechanism must be provided. As a result, the structure of the existing four-way main valve is complicated and the cost is high.

Application content

Based on this, it is necessary to provide a four-way main valve, a four-way reversing valve assembly and an air-conditioning unit with a simple structure and low cost to solve the above problems.

A four-way main valve, comprising:

The cylinder body is provided with a plurality of main valve ports, the side walls at both ends of the cylinder body are provided with air inlet channels, and the inner walls at both ends of the cylinder body are provided with ventilation grooves. The air inlet passages at the same end communicate with each other and extend along the axial direction of the cylinder; and

a reversing piston, which is slidably arranged in the cylinder, and two sides of the reversing piston cooperate with the cylinder to form a first air chamber and a second air chamber respectively;

Wherein, the first air chamber and the second air chamber are communicated with the air inlet channel through the ventilation groove located at the same end of the cylinder.

In one embodiment, the vent groove extends to the end of the barrel.

In one embodiment, the four-way main valve further includes an inner bushing disposed on the inner wall of the cylinder, and an air guide structure is provided at a position corresponding to the ventilation groove.

In one of the embodiments, the air guide structure is a through groove overlapping with the ventilation groove.

In one embodiment, the air guide structure is a plurality of through holes, and the plurality of through holes are arranged at intervals in the extending direction of the ventilation groove.

In one embodiment, the cylindrical body is a hollow cylindrical structure with two ends open, and the two ends of the cylindrical body are provided with end caps.

In one embodiment, a surface of the end cover facing the cylinder body is provided with an abutment disc, and the outer diameter of the abutment disc is smaller than the inner diameter of the cylinder body, so as to cooperate with the inner wall of the cylinder body to form an annular groove into which the ventilation groove extends.

In one of the embodiments, the plurality of main valve ports are arranged at equal intervals around the circumference of the cylinder.

A four-way reversing valve assembly includes a pilot valve and the four-way main valve according to any one of the above preferred embodiments, wherein the pilot valve is used to control the four-way main valve to change direction.

In the above four-way main valve and four-way reversing valve assembly, when reversing, the reversing piston needs to be pushed to the other side. Because the first air chamber and the second air chamber are both communicated with the corresponding air inlet holes through the ventilation grooves on the inner wall of the cylinder. Therefore, when the reversing operation is performed, the high-pressure gas in the pilot valve can directly enter the first air chamber or the second air chamber through the corresponding air inlet port and the ventilation groove, thereby pushing the reversing piston to move. That is to say, the high-pressure gas in the pilot valve does not need to be transferred through the flow passage in the middle of the reversing piston. In this way, there is no need to additionally provide a flow channel and a flow channel switching mechanism on the reversing piston. Therefore, the structure of the four-way main valve and the four-way reversing valve assembly is simplified and the cost is significantly reduced.

An air conditioning unit includes the four-way reversing valve assembly as described in the above preferred embodiment, wherein the heat exchanger and the compressor are respectively communicated with the corresponding main valve ports.

Description of drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that are used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

1 is a schematic structural diagram of a four-way reversing valve assembly in a preferred embodiment of the application;

FIG. 2 is a schematic structural diagram of a four-way main valve in the four-way reversing valve assembly shown in FIG. 1;

Fig. 3 is an enlarged schematic view of part A in the four-way main valve shown in Fig. 2;

Fig. 4 is the structural schematic diagram of the cylinder in the four-way main valve shown in Fig. 2;

Fig. 5 is the enlarged schematic diagram of part B in the cylinder shown in Fig. 4;

FIG. 6 is a schematic structural diagram of the inner bushing in the four-way main valve shown in FIG. 2;

FIG. 7 is a schematic structural diagram of an inner bushing in another embodiment.

detailed description

Referring to FIG. 1 , the present application provides a four-way reversing valve assembly 10 and a four-way main valve 100 . The four-way reversing valve assembly 10 includes a pilot valve 200 and a four-way main valve 100 , and the pilot valve 200 is used to control the four-way main valve 100 to change direction.

The pilot valve 200 is an electromagnetic four-way reversing valve, which generally includes a solenoid valve (not shown) and a four-way valve (not shown). By controlling the on-off of the solenoid valve, the communication state of each valve port of the pilot valve 200 can be controlled, thereby controlling the reversing process of the four-way main valve 100 . Specifically, the pilot valve 200 has a first pilot valve port a, a second pilot valve port b, a third pilot valve port c, and a fourth pilot valve port d. When the solenoid valve is powered off, the first pilot valve port a is communicated with the fourth pilot valve port d, and the second pilot valve port b is communicated with the third pilot valve port c. When the solenoid valve is energized, the first pilot valve port a can be communicated with the second pilot valve port b, and the third pilot valve port c can be communicated with the fourth pilot valve port d.

It should be noted that, in other embodiments, the above control process may also be reversed. That is, when the solenoid valve is de-energized, the first pilot valve port a is communicated with the second pilot valve port b, and the third pilot valve port c is communicated with the fourth pilot valve port d. When the solenoid valve is energized, the first pilot valve port a is communicated with the fourth pilot valve port d, and the second pilot valve port b is communicated with the third pilot valve port c.

Please also refer to FIG. 2 , the four-way main valve 100 in the preferred embodiment of the present application includes a cylinder body 110 and a reversing piston 120 .

The cylindrical body 110 is generally a metal cylindrical structure and is cylindrical. The cylinder body 110 is provided with a plurality of main valve ports, and the main valve ports are used to communicate with the heat exchanger and the compressor in the air conditioning unit. In order to facilitate connection with each component of the air-conditioning unit, a plurality of main valve ports are arranged at equal intervals around the circumference of the cylinder body 110 . Specifically, the main valve ports on the cylinder body 110 are the first main valve port 101 , the second main valve port (not shown), the third main valve port 103 and the fourth main valve port (not shown), and the above The four main valve ports are arranged on the cylinder body 110 in a cross shape. Since the second main valve port and the fourth main valve port are in the direction perpendicular to the drawing paper, they are not shown in the figure because they are blocked.

In addition, the present application provides an air-conditioning unit (not shown), the air-conditioning unit includes a four-way reversing valve assembly 10, an outdoor unit (not shown), an indoor unit (not shown) and a compressor (not shown) . The heat exchanger of the outdoor unit, the heat exchanger of the indoor unit and the compressor are respectively communicated with the corresponding main valve ports.

More specifically, the first main valve port 101 is in communication with the air outlet (high pressure side) of the compressor, and the high-temperature and high-pressure refrigerant gas flows in from the first main valve port 101; the second main valve port is in communication with the heat exchanger of the indoor unit. The third main valve port 103 communicates with the suction port (low pressure side) of the compressor, and the low temperature and low pressure refrigerant gas will flow in from the third main valve port 103; the fourth main valve port communicates with the heat exchanger of the outdoor unit.

It should be pointed out that, in other embodiments, the connection relationship between the plurality of main valve ports, the compressor and the heat exchanger can be interchanged.

The side walls at both ends of the cylinder body 110 are provided with air inlet channels 111 . The air inlet channel 111 penetrates the side wall of the cylindrical body 110 to communicate with the interior of the cylindrical body 110 . The intake port 111 is used to communicate the cylinder 110 with the valve port of the pilot valve 200 . Specifically, in the figure, the intake port 111 located at the left end of the cylinder 110 is connected to the second pilot valve port b through the second connecting pipe 202, and the intake port 111 located at the right end of the cylinder 110 is connected to the fourth connecting pipe 204 through the fourth connecting pipe 204. The pilot valve port d is communicated. In addition, the first pilot valve port a of the pilot valve 200 communicates with the first main valve port 101 through the first connecting pipe 201; the third pilot valve port c communicates with the third main valve port 103 through the third connecting pipe 203. That is, the first pilot valve port a is connected to the high pressure side, and the third pilot valve port c is connected to the low pressure side.

It should be pointed out that, in other embodiments, the connection relationship between each valve port in the pilot valve 200 and the intake port 111 on the cylinder body 110 and the plurality of main valve ports can be changed.

Further, please refer to FIG. 4 and FIG. 5 together, the inner walls of both ends of the cylinder body 110 are provided with ventilation grooves 112 , and the ventilation grooves 112 are in communication with the air inlet channels 111 located at the same end of the cylinder body 110 and extend along the axial direction of the cylinder body 110 . . The ventilation groove 112 can be formed by machining methods such as drilling and milling.

Specifically, in this embodiment, the cylindrical body 110 is a hollow cylindrical structure with two ends open, and the two ends of the cylindrical body 110 are provided with end caps 113 . The end cover 113 is generally fastened to the end face of the cylinder body 110 by screws, and a sealing gasket is provided to achieve sealing between the two. The end caps 113 can be detached from both ends of the cylindrical body 110 , so it is convenient to process the ventilation grooves 112 on the inner walls of the two ends of the cylindrical body 110 .

It should be pointed out that, in other embodiments, the cylindrical body 110 may also be a closed or semi-closed cylindrical structure with no openings at both ends or only one opening at one end.

Please refer to FIGS. 1 and 2 again, the reversing piston 120 is slidably disposed in the cylinder 110 , and two sides of the reversing piston 120 cooperate with the cylinder 110 to form the first air chamber 102 and the second air chamber 104 respectively. The first air chamber 102 and the second air chamber 104 are used to distinguish the two air chambers formed in the cylinder 110. The air chamber on the right side of the figure is called the first air chamber 102, and the air chamber on the left side is called the first air chamber 102. is the second air chamber 104 . When the pressure of the first air chamber 102 is higher than that of the second air chamber 104, the reversing piston 120 will be pushed to slide to the left due to the pressure difference; otherwise, the reversing piston 120 will be pushed to slide to the right.

The first air chamber 102 and the second air chamber 104 communicate with the air inlet channel 111 through the ventilation groove 112 located at the same end of the cylinder 110 . For example, one end of the ventilation groove 112 located on the right side of the cylinder body 110 extends into the first air chamber 102 so as to connect the first air chamber 102 with the air inlet channel 111 on the right side. Moreover, no matter where the reversing piston 120 slides, the ventilation groove 112 can maintain communication with the first air chamber 102 . Similarly, the ventilation groove 112 located on the left side of the cylinder body 110 can also be kept in communication with the second air chamber 104 all the time.

The reversing piston 120 can switch the communication state between the main valve ports by sliding along the cylinder 110 , thereby realizing the reversing of the four-way main valve 100 . Specifically, the reversing piston 120 is provided with a first compartment 121 and a second compartment 122 along its axial direction, and both the first compartment 121 and the second compartment 122 are divided into two parts along the radial direction of the reversing piston 120 part.

When the reversing piston 120 slides to a position where the first compartment 121 is opposite to each main valve port, the first main valve port 101 and the fourth main valve port communicate through a part of the first compartment 121, and the second main valve The port and the third main valve port 103 are communicated through another part of the first compartment 121; when the reversing piston 120 slides to the relative position of the second compartment 122 and each main valve port, the first main valve port 101 and The second main valve port is communicated through a part of the second compartment 122 , and the fourth main valve port and the third main valve port 103 are communicated through another part of the second compartment 122 .

It can be seen that, by changing the position of the reversing piston 120, the refrigerant flow direction can be changed, so that the air conditioning unit can be switched between the cooling and heating modes.

Specifically, when the first main valve port 101 is in communication with the fourth main valve port, and the second main valve port is in communication with the third main valve port 103, the air conditioner unit is in the cooling mode. At this time, the high-temperature and high-pressure refrigerant gas enters the heat exchanger of the outdoor unit through the first main valve port 101 and the fourth main valve port, and flows through the heat exchanger of the indoor unit to absorb heat after releasing heat, and finally forms a low-temperature and low-pressure gas Return to the compressor through the second main valve port and the third main valve port 103, and circulate in sequence.

And when the first main valve port 101 is in communication with the second main valve port, and the fourth main valve port is in communication with the third main valve port 103, it is in the heating mode. At this time, the high-temperature and high-pressure refrigerant gas first enters the heat exchanger of the indoor unit through the first main valve port 101 and the second main valve port, and then flows through the heat exchanger of the outdoor unit to absorb heat after releasing heat, and finally forms a low-temperature and low-pressure gas It returns to the compressor through the fourth main valve port and the third main valve port 103, and circulates in sequence.

The overall working process of the four-way reversing valve assembly 10 is briefly described below with reference to FIG. 1 :

When the solenoid valve of the pilot valve 200 is not energized, the first pilot valve port a communicates with the fourth pilot valve port d, and the second pilot valve port b communicates with the third pilot valve port c. Moreover, the first pilot valve port a and the first main valve port 101 are kept in communication through the first connecting pipe 201 , and the third pilot valve port c and the third main valve port 103 are maintained in communication through the third connecting pipe 203 . Therefore, the first air chamber 102 is connected to the high-pressure side through the intake port 111, the fourth pilot valve port d, the first pilot valve port a and the first main valve port 101 in sequence, while the second air chamber 104 is sequentially connected to the high pressure side through the intake air port 101. The orifice 111 , the second pilot valve port b, the third pilot valve port c and the third main valve port 103 are connected to the low pressure side.

At this time, the air pressure of the first air chamber 102 is greater than that of the second air chamber 104, so the reversing piston 120 will be driven to move leftward under the action of the pressure difference. After the reversing piston 120 moves to the left, the second compartment 122 will be opposite to each main valve port, so the first main valve port 101 will communicate with the second main valve port, and the fourth main valve port will be connected with the third main valve port. The valve port 103 communicates. The high-temperature and high-pressure refrigerant gas will first enter the heat exchanger of the indoor unit from the first main valve port 101 and the second main valve port, and then flow through the heat exchanger of the outdoor unit to absorb heat, and finally form a low-temperature and low-pressure gas through the fourth. The main valve port and the third main valve port 103 return to the compressor, and the air conditioning unit will be in the heating mode.

When the solenoid valve of the pilot valve 200 is energized, the first pilot valve port a communicates with the second pilot valve port b, the fourth pilot valve port d communicates with the third pilot valve port c, and the first pilot valve port a communicates with the third pilot valve port c. The first main valve port 101 is kept in communication with the first connecting pipe 201 , and the third pilot valve port c is kept in communication with the third main valve port 103 . Therefore, the first air chamber 102 is connected to the low pressure side through the intake port 111, the fourth pilot valve port d, the third pilot valve port c and the third main valve port 103 in sequence, while the second air chamber 104 is sequentially connected through the intake air The orifice 111 , the second pilot valve port b, the first pilot valve port a and the first main valve port 101 are connected to the high pressure side.

At this time, the air pressure of the second air chamber 104 is greater than the air pressure of the first air chamber 102, so the reversing piston 120 will be driven to move to the right under the action of the pressure difference. When the reversing piston 120 moves in place, the first compartment 121 is opposite to each main valve port, so the first main valve port 101 communicates with the fourth main valve port, and the second main valve port and the third main valve port 103 Connected. The high-temperature and high-pressure refrigerant gas will enter the heat exchanger of the outdoor unit through the first main valve port 101 and the fourth main valve port, and then flow through the heat exchanger of the indoor unit to absorb heat after releasing heat, and finally form low-temperature and low-pressure gas through the second heat exchanger. The main valve port and the third main valve port 103 return to the compressor. The four-way main valve 100 realizes reversal, and the air conditioning unit will switch to the cooling mode.

During reversing, both the first air chamber 102 and the second air chamber 104 are kept in communication with the corresponding air inlet passages 111 through the ventilation grooves 112 on the inner wall of the cylinder 110 . Therefore, when the reversing operation is performed, the high-pressure gas in the pilot valve 200 can directly enter the first air chamber 102 or the second air chamber 104 through the corresponding air inlet port 111 and the ventilation groove 112, thereby pushing the reversing piston 120 to move . That is to say, the high-pressure gas in the pilot valve 200 does not need to pass through the flow passage in the middle of the reversing piston 120 for transfer. In this way, the reversing piston 120 does not need to be additionally provided with a flow passage and a flow passage switching mechanism, the processing of the reversing piston 120 is simpler, the number of parts is reduced, the structure of the four-way main valve 100 is simplified, and the cost is significantly reduced.

In this embodiment, the ventilation groove 112 extends to the end of the cylinder body 110 .

Specifically, the ventilation groove 112 in this embodiment extends to the edge of the opening of the cylinder body 110 . For the cylindrical body 110 that is not open at both ends, the ventilation groove 112 may extend to the end surface of the cylindrical body 110 . In this way, the ventilation groove 112 can always protrude from the surface of the reversing piston 120 without being blocked by the reversing piston 120 , so as to ensure that the ventilation groove 112 is kept in communication with the corresponding first air chamber 102 and the second air chamber 104 .

Referring to FIG. 5 again, and referring to FIGS. 6 and 7 together, in this embodiment, the four-way main valve 100 further includes an inner bushing 130 disposed on the inner wall of the cylinder body 110 , and the inner bushing 130 corresponds to the ventilation groove 112 The air guide structure 131 is provided at the position of .

The inner bushing 130 can be formed of materials such as ceramics, stainless steel, etc., which can protect the inner wall of the cylinder body 110 and improve the smoothness of the reversing piston 120 during the sliding process. The air guide structure 131 can prevent the inner bushing 130 from covering the ventilation groove 112, so that the ventilation groove 112 can be kept in communication with the air chamber.

The air guide structure 131 may be in various forms, as long as the inner bushing 130 does not block the ventilation groove 112 . For example, as shown in FIG. 6 , in this embodiment, the air guide structure 131 is a through groove overlapping with the ventilation groove 112 . Similarly, the through grooves can be formed by drilling, milling or cutting.

As shown in FIG. 7 , in another embodiment, the air guide structure 131 is a plurality of through holes, and the plurality of through holes are arranged at intervals in the extending direction of the ventilation groove 112 . Likewise, through holes can be formed by drilling, milling or cutting.

Please also refer to FIG. 3 , in this embodiment, the surface of the end cover 113 facing the cylinder body 110 is provided with an abutment disc 1131 , and the outer diameter of the abutment disc is smaller than the inner diameter of the cylinder body 110 to match the inner wall of the cylinder body 110 . An annular groove 114 is formed into which the vent groove 112 extends.

Specifically, the reversing piston 120 can slide to the contact plate 1131 on the end cover 113 in the cylindrical body 110 to realize reversing. Due to the existence of the abutment plate 1131 , the reversing piston 120 cannot be in complete contact with the end surface of the cylindrical body 110 . That is, the reversing piston 120 cannot reach the area where the annular groove 114 is located. Also, the vent groove 112 extends to the annular groove 114 . Therefore, the high-pressure gas in the pilot valve 200 can first enter the annular groove 114 through the intake hole 111 and the ventilation groove 112, and then the reversing piston 120 can be pushed to slide, thereby realizing reversing.

The above-mentioned four-way main valve 100 and four-way reversing valve assembly 10 need to push the reversing piston 120 to the other side during reversing. Because the first air chamber 102 and the second air chamber 104 are both communicated with the corresponding air inlet channels 111 through the ventilation grooves 112 on the inner wall of the cylinder body 110 . Therefore, when the reversing operation is performed, the high-pressure gas in the pilot valve 200 can directly enter the first air chamber 102 or the second air chamber 104 through the corresponding air inlet port 111 and the ventilation groove 112, thereby pushing the reversing piston 120 to move . That is to say, the high-pressure gas in the pilot valve 200 does not need to pass through the flow passage in the middle of the reversing piston 120 for transfer. In this way, the reversing piston 120 does not need to additionally provide a flow channel and a flow channel switching mechanism. Therefore, the structures of the above-mentioned four-way main valve 100 and the four-way reversing valve assembly 10 are simplified and the cost is significantly reduced.

The above-mentioned embodiments only represent several embodiments of the present application, and the descriptions thereof are relatively specific and detailed, but should not be construed as a limitation on the scope of the patent application. It should be pointed out that for those skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the scope of protection of the patent of the present application shall be subject to the appended claims.

Claims

A four-way main valve, characterized in that it includes:

The cylinder body is provided with a plurality of main valve ports, the side walls at both ends of the cylinder body are provided with air inlet channels, and the inner walls at both ends of the cylinder body are provided with ventilation grooves. The air inlet passages at the same end communicate with each other and extend along the axial direction of the cylinder; and

a reversing piston, which is slidably arranged in the cylinder, and two sides of the reversing piston cooperate with the cylinder to form a first air chamber and a second air chamber respectively;

Wherein, the first air chamber and the second air chamber are communicated with the air inlet channel through the ventilation groove located at the same end of the cylinder.
The four-way main valve according to claim 1, wherein the ventilation groove extends to the end of the cylinder.
The four-way main valve according to claim 1, wherein the four-way main valve further comprises an inner bushing disposed on the inner wall of the cylinder, and the inner bushing is arranged at a position corresponding to the ventilation groove With air guide structure.
The four-way main valve according to claim 3, wherein the air guide structure is a through groove that overlaps with the ventilation groove.
The four-way main valve according to claim 3, wherein the air guide structure is a plurality of through holes, and the plurality of through holes are arranged at intervals in the extending direction of the ventilation groove.
The four-way main valve according to claim 1, wherein the cylinder body is a hollow cylinder structure with two ends open, and the two ends of the cylinder body are provided with end caps.
The four-way main valve according to claim 6, wherein a surface of the end cover facing the cylinder body is provided with an abutment disc, and the outer diameter of the abutment disc is smaller than the inner diameter of the cylinder body, so as to An annular groove is formed in cooperation with the inner wall of the cylinder, and the ventilation groove extends into the annular groove.
The four-way main valve according to claim 1, wherein the plurality of main valve ports are arranged at equal intervals around the circumference of the cylinder.
A four-way reversing valve assembly, characterized in that it comprises a pilot valve and the four-way main valve according to any one of the preceding claims 1 to 8, wherein the pilot valve is used to control the reversing of the four-way main valve .
An air-conditioning unit, characterized in that it comprises the four-way reversing valve assembly as claimed in claim 9, wherein the heat exchanger and the compressor are respectively communicated with the corresponding main valve ports.