CN216112321U

CN216112321U - Four-way reversing valve for refrigerating system

Info

Publication number: CN216112321U
Application number: CN202122549472.0U
Authority: CN
Inventors: 淮晓利; 付刚平; 其他发明人请求不公开姓名
Original assignee: Shanghai Konowei New Energy Technology Co ltd
Current assignee: Wuxi Konowei New Energy Technology Co ltd
Priority date: 2021-10-22
Filing date: 2021-10-22
Publication date: 2022-03-22
Anticipated expiration: 2031-10-22

Abstract

The utility model discloses a four-way reversing valve for a refrigerating system, which comprises: the valve seat is provided with four pipe orifices; a cross-shaped partition plate is arranged in the valve seat to divide the lower space in the valve seat into a first accommodating cavity, a second accommodating cavity, a third accommodating cavity and a fourth accommodating cavity, wherein each accommodating cavity is communicated with a pipe orifice; the valve core is hollow, the bottom of the valve core is open, and a partition plate is arranged in the valve core to divide the interior of the valve core into a first flow passage and a second flow passage; the motor can drive the valve core to switch states; in a first state, the first flow channel communicates the first accommodating cavity with the second accommodating cavity, and the second flow channel communicates the other two accommodating cavities; in a second state obtained by anticlockwise rotation, the first flow passage communicates the first accommodating cavity with the fourth accommodating cavity, and the second flow passage communicates the other two accommodating cavities; and in a second state obtained by anticlockwise rotation, the first flow channel communicates the second accommodating cavity with the third accommodating cavity, and the second flow channel communicates the other two accommodating cavities. The utility model discloses a four-way reversing valve for refrigerating system that provide need not through pressure differential control.

Description

Four-way reversing valve for refrigerating system

Technical Field

The utility model relates to the technical field of refrigeration, in particular to a four-way reversing valve for a refrigeration system.

Background

In a refrigeration system, a traditional four-way reversing valve pushes a piston to move in position through the difference between the exhaust pressure and the suction pressure of the refrigeration system so as to realize reversing. If the refrigeration system needs to operate a heat pump circulation mode in winter, the refrigeration cycle must be started first, when the pressure difference between the high pressure and the low pressure of the refrigeration system is higher than a set difference value, a pilot valve electrifying pipeline of the four-way reversing valve is switched on, and high-pressure gas is led out from the exhaust of the compressor to push the piston position of the four-way reversing valve to move, so that the reversing action of the four-way reversing valve is realized. At this point, the refrigeration system is again switched to the heat pump cycle mode. In the prior art, the mode of realizing the action of the four-way reversing valve through differential pressure control and mode conversion transition is complex in operation, low in efficiency and very inconvenient to use.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problems, the utility model provides the four-way reversing valve which is directly driven by the motor, has a simple structure and is convenient to reverse.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a four-way reversing valve for a refrigeration system, comprising:

the valve seat is provided with four pipe orifices along the circumferential direction, namely a first pipe orifice, a second pipe orifice, a third pipe orifice and a fourth pipe orifice in sequence; a cross-shaped partition plate is arranged in the lower space in the valve seat and divides the lower space in the valve seat into four accommodating cavities, namely a first accommodating cavity, a second accommodating cavity, a third accommodating cavity and a fourth accommodating cavity, wherein each accommodating cavity is communicated with one pipe orifice;

the valve core is arranged in the valve seat and is arranged above the accommodating cavity, the valve core is of a hollow structure, the bottom of the valve core is open, a partition plate is arranged in the valve core to divide the interior of the valve core into two halves to form two flow channels, and the two flow channels are a first flow channel and a second flow channel respectively;

the motor is arranged on the valve seat and connected with the valve core, and the motor can drive the valve core to rotate in the valve seat so as to switch the valve core between a first state and a second state;

in the first state, the first flow passage communicates the first accommodating cavity with the second accommodating cavity, and the second flow passage communicates the third accommodating cavity with the fourth accommodating cavity;

the second state is obtained by clockwise rotation or anticlockwise rotation of the valve core under the first state; when the valve core rotates anticlockwise under the first state to obtain the second state, at the moment, under the second state, the first flow passage communicates the first accommodating cavity with the fourth accommodating cavity, and the second flow passage communicates the second accommodating cavity with the third accommodating cavity; when the valve core rotates clockwise in the first state to obtain the second state, the first flow passage communicates the second accommodating cavity with the third accommodating cavity and the second flow passage communicates the first accommodating cavity with the fourth accommodating cavity in the second state.

As an alternative to the four-way reversing valve for a refrigeration system described above, the valve spool has a rotational angle of +90 ° or-90 °.

As an alternative to the four-way selector valve for a refrigeration system described above, the valve element is cylindrical, and the first flow passage and the second flow passage are two semi-cylindrical flow passage grooves.

As an alternative of the four-way reversing valve for the refrigeration system, a connecting shaft is arranged at the top end of the valve core and connected to the motor; a bearing is sleeved on the connecting shaft;

the bottom of case is provided with the installation axle, the installation axle rotates to be located on the cross baffle.

As an alternative of the four-way reversing valve for the refrigeration system, the valve seat comprises a valve seat body and a valve cover, the motor is arranged on the valve cover, and the connecting shaft penetrates through the valve cover from the inside of the valve seat and is connected with the motor.

As an alternative of the four-way reversing valve for the refrigeration system, one of the valve core and the valve cover is provided with a limiting column, the other is provided with an arc-shaped limiting groove, and the circle center of the arc-shaped limiting groove is located on the central axis of the valve core so as to limit the rotation angle of the valve core.

As an alternative of the four-way reversing valve for the refrigeration system, an elastic part is arranged at the top of the valve core, the top end of the elastic part is abutted against the valve cover, the bottom end of the elastic part is abutted against the valve core, and the elastic part has a pretightening force for pressing down the valve core.

As an alternative to the four-way reversing valve for a refrigeration system described above, the four-way reversing valve further comprises:

and the high-pressure gas circuit is connected to the top of the valve core so as to generate downward pressure on the valve core.

As an alternative to the four-way reversing valve for a refrigeration system described above, the valve element is provided with an annular groove on its outer periphery.

As an alternative to the four-way reversing valve for the refrigeration system, a polytetrafluoroethylene coating is arranged on the contact surface of the valve core and the valve seat.

The utility model has the advantages that: the motor is arranged on the four-way reversing valve for the refrigerating system, the valve core is driven by the motor to move, reversing is achieved, the four-way reversing valve does not need to move through pressure difference control and mode conversion transition, the implementation mode is simple, control is accurate, and efficiency is high. The valve core is internally provided with a first flow passage and a second flow passage, the valve seat is internally provided with accommodating cavities communicated with different pipe orifices of the valve seat, the valve core is rotated to ensure that the flow passages in the valve core are communicated with different accommodating cavities on the valve seat, so that the refrigerant can be reversed, different working modes can be switched, the structure is simple, and the operation is convenient.

Drawings

FIG. 1 is a schematic view of the construction of a four-way reversing valve according to the present invention;

FIG. 2 is an exploded view of the four-way reversing valve of the present invention;

FIG. 3 is a schematic view of the structure of FIG. 2 from another perspective;

FIG. 4 is a schematic top view of the four-way reversing valve of the present invention;

FIG. 5 is a schematic view of the structure of section A-A in FIG. 4;

FIG. 6 is a schematic structural view of section B-B of FIG. 4;

FIG. 7 is a schematic view of the construction of the valve seat body of the present invention;

FIG. 8 is a schematic top view of the valve seat body of the present invention;

fig. 9 is a schematic view of the valve cartridge of the present invention.

In the figure:

100. a valve seat; 101. a bearing; 110. a valve seat body; 111. a first nozzle; 112. a second orifice; 113. a third nozzle; 114. a fourth orifice; 115. a cross-shaped partition plate; 116. a first accommodating chamber; 117. a second accommodating chamber; 118. a third accommodating chamber; 119. a fourth accommodating chamber; 120. a valve cover; 121. an arc-shaped limiting groove;

200. a valve core; 201. a partition plate; 202. a first flow passage; 203. a second flow passage; 204. a limiting column; 205. a connecting shaft; 206. installing a shaft; 207. a seal ring;

300. an electric motor.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The meaning of the above terms in the present invention can be understood by those of ordinary skill in the art as the case may be.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The technical scheme of the utility model is further explained by the specific implementation mode in combination with the attached drawings.

The utility model provides a four-way reversing valve for a refrigerating system. As introduced in the background art, the four-way reversing valve of the present invention is mainly an improvement to overcome the disadvantages of the four-way reversing valve in a refrigeration system, and therefore, the four-way reversing valve of the present invention is mainly used in the refrigeration system, but may also be applied to other technical fields and scenes, and is not limited herein.

Referring to fig. 1 to 4, the four-way reversing valve of the present invention includes a valve seat 100, a valve element 200 installed in the valve seat 100, and a motor 300. The valve seat 100 includes a valve seat body 110 and a valve cover 120. The motor 300 is disposed on the valve seat 100, and particularly, may be disposed on the valve cover 120, the valve element 200 is disposed in the valve seat 100, and the valve element 200 is connected to a rotor shaft of the motor 300, so that the valve element 200 is driven by the motor 300 to rotate.

As shown in fig. 1 to 4, four nozzles are circumferentially disposed on the valve seat 100, which are a first nozzle 111, a second nozzle 112, a third nozzle 113 and a fourth nozzle 114 in sequence. The valve seat 100 has an accommodating space for accommodating the valve element 200, as shown in fig. 7, a cross-shaped partition plate 115 is disposed in a lower space of the valve seat 100, the cross-shaped partition plate 115 divides the lower space of the valve seat 100 into four accommodating cavities, namely a first accommodating cavity 116, a second accommodating cavity 117, a third accommodating cavity 118 and a fourth accommodating cavity 119, and each accommodating cavity is communicated with one pipe orifice. As shown in fig. 7 and 8, the first receiving chamber 116 communicates with the first nozzle 111, the second receiving chamber 117 communicates with the second nozzle 112, the third receiving chamber 118 communicates with the third nozzle 113, and the fourth receiving chamber 119 communicates with the fourth nozzle 114.

As shown in fig. 5, the valve body 200 is disposed above the housing chambers (the first housing chamber 116, the second housing chamber 117, the third housing chamber 118, and the fourth housing chamber 119) inside the valve seat 100. As shown in fig. 9, the valve core 200 is a hollow structure, the bottom of the valve core is open, a partition plate 201 is arranged in the valve core, the partition plate 201 divides the interior of the valve core 200 into two halves to form two bilaterally symmetrical flow channels, which are a first flow channel 202 and a second flow channel 203 respectively.

When the four-way reversing valve works, the motor 300 drives the valve core 200 to rotate in the valve seat 100, so that the valve core 200 is switched between a first state and a second state. When the valve element 200 is in the first state, please refer to fig. 6 to 9, the first flow channel 202 of the valve element 200 is located right above the first receiving cavity 116 and the second receiving cavity 117 in the valve seat 100, so that the first flow channel 202 connects the first receiving cavity 116 with the second receiving cavity 117 to form a flow path, the refrigerant enters the first receiving cavity 116 from the first nozzle 111 of the valve seat 100, enters the first flow channel 202 of the valve element 200, enters the second receiving cavity 117 of the valve seat 100 through the first flow channel 202, and flows out from the second nozzle 112, the second flow channel 203 of the valve element 200 is located above the third receiving cavity 118 and the fourth receiving cavity 119 in the valve seat 100, and the third receiving cavity 118 is connected with the fourth receiving cavity 119 through the second flow channel 203.

When the refrigeration system needs to change direction, the valve core 200 of the four-way reversing valve rotates a certain angle, generally 90 degrees, in the valve seat 100, the valve core 200 rotates to the second state, the valve core 200 can rotate 90 degrees clockwise to obtain the second state, and can also rotate 90 degrees counterclockwise to obtain the second state, that is, the rotation angle of the valve core 200 is +90 degrees or-90 degrees. When the spool 200 is rotated counterclockwise by 90 ° to the second state, the first flow passage 202 communicates the first accommodation chamber 116 with the fourth accommodation chamber 119, and the second flow passage 203 communicates the second accommodation chamber 117 with the third accommodation chamber 118; when the spool 200 is rotated clockwise by 90 ° to the second state, the first flow passage 202 communicates the second accommodation chamber 117 with the third accommodation chamber 118, and the second flow passage 203 communicates the first accommodation chamber 116 with the fourth accommodation chamber 119.

In the embodiment of the present invention, the first pipe orifice 111 of the valve seat 100 is an exhaust port of a compressor, the second pipe orifice 112 is a heat exchanger port on the outdoor side, the third pipe orifice 113 is an intake port of the compressor, and the fourth pipe orifice 114 is a heat exchanger port on the cabin inner side. When the refrigeration system is in a refrigeration cycle operation mode, an exhaust port (a first pipe orifice 111) of the compressor is connected with a heat exchanger port (a second pipe orifice 112) on the outdoor side, high-pressure exhaust of the compressor enters a heat exchanger on the outdoor side, and the heat exchanger on the outdoor side is a condenser; the suction port (third pipe 113) of the compressor is connected with the port (fourth pipe 114) of the heat exchanger on the inner side of the cabin, the heat exchanger in the cabin is used as an evaporator, and the air sucked by the evaporator enters the suction port of the compressor. When the refrigerating system is in a heating cycle operation mode, an exhaust port (a first pipe orifice 111) of the compressor is communicated with a heat exchanger port (a fourth pipe orifice 114) on the inner side of the cabin, high-pressure exhaust gas of the compressor enters a heat exchanger in the cabin, and the heat exchanger in the cabin is a condenser; the heat exchanger port (second port 112) on the outdoor side communicates with the suction port (third port 113) of the compressor, the heat exchanger on the outdoor side serves as an evaporator, and suction air of the evaporator enters the suction port of the compressor.

The cross-shaped diaphragm 115 may be formed on the valve seat 100 by integral casting or machining, and similarly, the diaphragm 201 may be formed on the valve body 200 by integral casting or machining. In the present invention, the shape and size of the first flow channel 202 and the second flow channel 203 are not particularly limited as long as they can communicate with the corresponding receiving cavities of the valve seat 100. In one embodiment, the valve core 200 is cylindrical, the hollow space therein is also cylindrical, and the first flow channel 202 and the second flow channel 203 are two semi-cylindrical flow channel grooves.

In order to limit and guide the rotation of the valve core 200, as shown in fig. 2, 3 and 5, a limiting post 204 may be disposed on one of the valve core 200 and the valve cover 120, an arc-shaped limiting groove 121 may be disposed on the other of the valve core 200 and the valve cover 120, and the limiting post 204 is engaged in the arc-shaped limiting groove 121 to limit and guide the valve core 200. In the present invention, the arc-shaped stopper groove 121 is formed on the valve cap 120, and the stopper column 204 is formed on the valve body 200. As shown in fig. 3, the center of the arc-shaped limiting groove 121 is located on the central axis of the valve core 200, and when the valve core 200 rotates, the limiting post 204 is driven to slide in the arc-shaped limiting groove 121, so as to limit the rotation angle of the valve core 200, and improve the stability of the valve core 200 during rotation. It will be appreciated that the arc-shaped restriction groove 121 corresponds to a central angle of 90 ° to restrict the valve element 200 from rotating only 90 °. In addition, when the motor 300 is designed, the position of the motor 300 can be further limited, and the accurate position feedback and running state monitoring of the four-way reversing valve can be ensured by combining the mechanical limiting mechanism matched with the limiting column 204 through the arc-shaped limiting groove 121 and the limiting design of the motor 300. For example, if the valve element 200 does not rotate to the mechanical limit point of the limit post 204 and the arc-shaped limit groove 121, it indicates that the valve element 200 is actually blocked and cannot rotate to the mechanical limit point, and if the motor 300 detects that the valve element is not in place, it can be determined that the four-way reversing valve is blocked, and then fault reporting can be performed.

In order to facilitate the installation of the valve cartridge 200, as shown in fig. 5, a connecting shaft 205 is provided at the top end of the valve cartridge 200, and the connecting shaft 205 passes through the valve cover 120 from the inside of the valve seat 100 and is connected to the motor 300 on the valve cover 120. The other end of the valve core 200 is provided with a mounting shaft 206, and the mounting shaft 206 is rotatably arranged on the cross-shaped partition plate 115. The mounting shaft 206 serves as a pivot point of the valve cartridge 200, and the valve cartridge 200 is rotated more stably. Referring to fig. 5, the bearing 101 is sleeved on the connecting shaft 205, so that the valve element 200 is rotatably connected to the valve cover 120 through the bearing 101, and the valve element 200 can rotate more smoothly.

In the utility model, the motor 300 is arranged outside the valve seat 100, the valve core 200 is driven by the open-type motor 300 to rotate to realize the reversing of the four-way reversing valve, and the motor 300 does not need to be made into a semi-closed or closed motor 300 form, so that the motor 300 does not need to carry out refrigerant pressure bearing design, and does not need to carry out motor 300 sealing design and refrigerant compatibility design, thereby leading the design matching of the motor 300 to be simpler. The DC motor 300 of 12V or 24V or the stepping motor 300 can be adopted.

Referring to fig. 5, in order to improve the sealing performance, a sealing ring 207 is sleeved on the connecting shaft 205. Specifically, a seal ring 207 is provided on the connecting shaft 205 at a position above the bearing 101 to prevent leakage of refrigerant from mating surfaces of the connecting shaft 205 and the valve cover 120.

Referring to fig. 6, since the refrigerant flows upward into the valve cartridge 200 from below the valve cartridge 200 in the present invention, it has a force of lifting up the valve cartridge 200. In the utility model, a path of high pressure is introduced into the top of the valve core 200 to generate downward pressure on the valve core 200, thereby ensuring the sealing effect of the valve core 200 and realizing trace leakage. That is, the four-way reversing valve further comprises a high-pressure air passage, and the high-pressure air passage is connected to the top of the valve core 200 and generates downward pressure on the valve core 200.

In order to further generate the depression effect on the valve core 200, an elastic member (not shown) such as a wave spring having a small elastic force may be further provided on the top of the valve core 200. The top end of the elastic element is abutted with the valve cover 120, the bottom end of the elastic element is abutted with the valve core 200, and the elastic element has a pretightening force for pressing down the valve core 200 so as to press down the valve core 200.

In one embodiment, an annular groove may be provided at the outer circumference of the valve cartridge 200. The annular groove is mainly used for collecting impurities which can enter, and on the other hand, the annular groove can also play a role of an air seal ring to realize sealing. 1-2 annular grooves can be machined. Specifically, the width of the groove may be 0.5mm, and the depth may be 0.5 mm.

In one embodiment, the contacting surface of the valve element 200 and the valve seat 100 is coated with teflon or chrome-plated to form a chrome-plated layer, which can increase the lubricity. A teflon coating and a chrome plating layer may be provided on the surface of the valve cartridge 200. The polytetrafluoroethylene coating belongs to soft material, can reduce the rotatory friction loss of case 200. If the valve core 200 has downward pressure, the polytetrafluoroethylene coating is arranged to enable the contact surface to be flexible, and the structure is simpler and more reliable.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the utility model. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A four-way reversing valve for a refrigeration system, comprising:

the valve seat (100), four orifices are arranged on the valve seat (100) along the circumferential direction, and are a first orifice (111), a second orifice (112), a third orifice (113) and a fourth orifice (114) in sequence; a cross-shaped partition plate (115) is arranged in the lower space in the valve seat (100), the lower space in the valve seat (100) is divided into four accommodating cavities, namely a first accommodating cavity (116), a second accommodating cavity (117), a third accommodating cavity (118) and a fourth accommodating cavity (119), and each accommodating cavity is communicated with one pipe orifice;

the valve core (200) is arranged in the valve seat (100) and above the accommodating cavity, the valve core (200) is of a hollow structure, the bottom of the valve core is open, a partition plate (201) is arranged in the valve core (200) to divide the interior of the valve core (200) into two halves to form two flow channels, and the two flow channels are a first flow channel (202) and a second flow channel (203) respectively;

the motor (300) is arranged on the valve seat (100) and connected with the valve core (200), and the motor (300) can drive the valve core (200) to rotate in the valve seat (100) so as to switch the valve core (200) between a first state and a second state;

in the first state, the first flow passage (202) communicates the first accommodating cavity (116) with the second accommodating cavity (117), and the second flow passage (203) communicates the third accommodating cavity (118) with the fourth accommodating cavity (119);

the second state is obtained by clockwise rotation or anticlockwise rotation of the valve core (200) in the first state; when the valve core (200) rotates anticlockwise in the first state to obtain the second state, in the second state, the first flow passage (202) communicates the first accommodating cavity (116) with the fourth accommodating cavity (119), and the second flow passage (203) communicates the second accommodating cavity (117) with the third accommodating cavity (118); when the valve core (200) rotates clockwise in the first state to obtain the second state, in the second state, the first flow passage (202) rotates anticlockwise to communicate the second accommodating cavity (117) with the third accommodating cavity (118), and the second flow passage (203) communicates the first accommodating cavity (116) with the fourth accommodating cavity (119).

2. The four-way reversing valve for a refrigeration system according to claim 1, wherein the rotation angle of the valve spool (200) is +90 ° or-90 °.

3. The four-way reversing valve for a refrigeration system according to claim 1, wherein the valve spool (200) is cylindrical, and the first flow passage (202) and the second flow passage (203) are two semi-cylindrical flow passage grooves.

4. The four-way reversing valve for the refrigerating system according to claim 1, wherein a top end of the valve core (200) is provided with a connecting shaft (205), and the connecting shaft (205) is connected to the motor (300); a bearing (101) is sleeved on the connecting shaft (205);

the bottom of case (200) is provided with installation axle (206), installation axle (206) are rotated and are located on the cross baffle (115).

5. The four-way reversing valve for the refrigerating system according to claim 4, wherein the valve seat (100) comprises a valve seat body (110) and a valve cover (120), the motor (300) is arranged on the valve cover (120), and the connecting shaft (205) passes through the valve cover (120) from the inside of the valve seat (100) and is connected with the motor (300).

6. The four-way reversing valve for the refrigerating system according to claim 5, wherein one of the valve core (200) and the valve cover (120) is provided with a limiting column (204), the other one of the valve core and the valve cover is provided with an arc-shaped limiting groove (121), and the center of the arc-shaped limiting groove (121) is on the central axis of the valve core (200) so as to limit the rotation angle of the valve core (200).

7. The four-way reversing valve for the refrigerating system according to claim 5, wherein an elastic member is arranged at the top of the valve core (200), the top end of the elastic member abuts against the valve cover (120), the bottom end of the elastic member abuts against the valve core (200), and the elastic member has a pre-tightening force for pressing down the valve core (200).

8. The four-way reversing valve for a refrigeration system of claim 1, further comprising:

the high-pressure air passage is connected to the top of the valve core (200) to generate downward pressure on the valve core (200).

9. The four-way reversing valve for the refrigeration system according to claim 1, wherein the valve core (200) is provided at an outer circumference thereof with an annular groove.

10. The four-way reversing valve for the refrigerating system according to claim 1, wherein the contact surface of the valve core (200) and the valve seat (100) is provided with a polytetrafluoroethylene coating.