CN116255478A - Switching valve and refrigerating system thereof - Google Patents

Abstract

The invention relates to the technical field of valves, in particular to a switching valve and a refrigerating system thereof. A switching valve comprises a valve body and a rotating pipe, wherein at least a first interface, a second interface and a third interface are formed in the valve body; the rotary pipe is internally provided with a first channel, the valve body is internally provided with a second channel communicated with a second interface or a third interface, the second channel is arranged around the first channel, and the end face of the rotary pipe, which is far away from the first interface, is attached to the inner wall of the valve body in the process of rotating the rotary pipe. The invention has the advantages that: thereby reducing the motion resistance of the rotating tube and ensuring smooth reversing.

Description

Switching valve and refrigerating system thereof

Technical Field

The invention relates to the technical field of valves, in particular to a switching valve and a refrigerating system thereof.

Background

The switching valve is arranged in the refrigerating system and used for realizing switching of pipelines.

In the existing switching valve, a piston structure is arranged in a valve body, a first channel and a second channel are isolated through the piston structure, and as pressure difference exists between the first channel and the second channel, the piston structure needs to overcome the pressure difference between the two channels when the piston structure is switched, so that the resistance of the piston structure in movement is increased, and the switching of products is difficult or failed.

Disclosure of Invention

In order to solve the problems, the invention provides a switching valve, which has the following technical scheme:

the switching valve comprises a valve body and a rotating pipe, wherein at least a first interface, a second interface and a third interface are formed in the valve body, one end of the rotating pipe is connected to the first interface, and the rotating pipe can rotate so that the first interface is selectively communicated with the second interface or the third interface through the rotating pipe; the rotary pipe is internally provided with a first channel, the valve body is internally provided with a second channel communicated with the second interface or the third interface, the second channel surrounds the first channel, and in the process of rotating the rotary pipe, the end face of the rotary pipe, which is far away from the first interface, is attached to the inner wall of the valve body.

The rotary pipe is arranged in the second channel, so that even if the medium pressure in the first channel is different from the medium pressure in the second channel, the circumferential direction of the rotary pipe is subjected to uniform force, and in the reversing process, the rotary pipe only needs to overcome the friction force with the inner wall of the valve body, so that the movement resistance of the rotary pipe is reduced, and the reversing is smooth; meanwhile, the end face of the rotating pipe is always attached to the inner wall of the valve body in the rotating process, so that the problem of mutual blowby of media between the first channel and the second channel is solved, the blowby is reduced, and when the rotating pipe is applied to a refrigerating system and used as a four-way reversing valve, the energy efficiency of the refrigerating system and the working stability of a compressor can be improved.

In one embodiment, the second interface and the third interface are located at the same end of the valve body, and the first interface is disposed opposite to the second interface and the third interface, respectively.

The rotary pipe is arranged in such a way that the rotary path is shorter in the process of rotating the rotary pipe, the reversing rapidity is realized, and in the process of rotating, excessive bending is not needed, so that the rotary pipe can be always attached to the inner wall of the valve body in the process of rotating; and, because the week side of rotatory pipe receives even circumference force, pressure can not form pressure to the both ends of rotatory pipe between first passageway and the second passageway, and the one end that the rotatory pipe was kept away from first interface can not the perk, strengthens the leakproofness between first passageway and the second passageway.

In one embodiment, the bottom wall inside the valve body is a plane, and the second interface and the third interface are arranged on the plane.

By means of the arrangement, the first channel and the second channel can be kept isolated as far as possible in the rotating process of the rotating tube.

In one embodiment, a sealing groove is formed in the end face of the end, far away from the first connector, of the rotating pipe, a sealing piece is arranged in the sealing groove, and the sealing piece is abutted to the plane.

Therefore, the tightness between the first channel and the second channel is further enhanced, and internal leakage is prevented.

In one embodiment, a first adapter is disposed at an end of the rotary tube away from the first interface, and one side of the rotary tube is rotatably connected to the bottom wall of the valve body through the first adapter, so that the rotary tube can rotate around the first adapter.

In this way, the swivel tube is conveniently and accurately positioned to the corresponding interface.

In one embodiment, a second adapter is arranged at one end of the rotating pipe, which is close to the first connector, and the rotating pipe is rotatably connected with the inner wall of the valve body through the second adapter.

In one embodiment, the switching valve further comprises a driving assembly, at least part of which is connected to the rotating tube to drive the rotating tube to rotate.

In one embodiment, the driving assembly comprises a first wheel, and the first wheel is sleeved outside the rotating tube and is positioned at one end of the rotating tube, which is close to the first interface.

By the first wheel driving, the switching valve can be applied to occasions where driving is not needed by pressure difference, and the application range is enlarged.

In one embodiment, the driving assembly further comprises a driving piece and a second wheel, a third cavity is further formed in the valve body, the third cavity is separated from the second channel, the driving piece is arranged in the third cavity, and the second wheel is connected with the driving piece and in transmission connection with the first wheel.

Thus, by means of two gear drives, the gear wheel connected with the driving member can be made smaller, enabling a saving of driving force.

The invention also provides the following technical scheme:

the refrigerating system comprises the switching valve, the refrigerating system comprises a compressor, an indoor heat exchanger and an outdoor heat exchanger, a fourth interface is further formed in the valve body, two ends of the compressor are respectively communicated with the first interface and the fourth interface, the second interface is communicated with the indoor heat exchanger, and the third interface is communicated with the outdoor heat exchanger.

So set up, first interface intercommunication compressor's import or export when the swinging arms rotates, can alleviate the gas channeling problem between the high low pressure runner, increase refrigerating system efficiency and compressor job stabilization nature.

In one embodiment, when the refrigeration system is in a refrigeration mode or a defrosting mode, the rotating pipe is communicated with the second port, and the third port is communicated with the fourth port through the second channel; when the refrigerating system is in a heating mode, the rotating pipe is communicated with the third interface, and the second interface is communicated with the fourth interface through the second channel.

Compared with the prior art, the switching valve provided by the invention has the advantages that the second channel is arranged around the first channel, so that the circumferential stress of the rotating pipe is consistent, the two ends of the rotating pipe are not stressed, and the resistance can be reduced only by overcoming the friction force between the rotating pipe and the inner wall of the valve body in the rotating process of the rotating pipe.

Drawings

FIG. 1 is a cross-sectional view of a switching valve provided by the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is a front view of the switching valve;

FIG. 4 is a cross-sectional view taken at B-B in FIG. 3;

fig. 5 is a perspective view of the switch.

The symbols in the drawings are as follows:

100. a switching valve; 10. a valve body; 11. a valve cavity; 111. a second channel; 112. a third chamber; 12. a first interface; 121. a first connection pipe; 13. a second interface; 131. a second connection pipe; 14. a third interface; 141. a third connection pipe; 15. a fourth interface; 151. a fourth connection pipe; 17. a plane; 171. a mounting groove; 18. a receiving groove; 20. a rotary tube; 21. a first channel; 22. sealing grooves; 23. a seal; 24. a first adapter; 25. a second adapter; 26. an extension shaft; 30. a drive assembly; 31. a driving member; 32. a first wheel; 33. and a second wheel.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It will be understood that when an element is referred to as being "mounted" to another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or/and" as used herein includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1, 3 and 5, the switching valve 100 provided by the present invention is installed in a refrigeration system for switching a pipeline.

In the existing switching valve, taking a high-capacity four-way reversing valve as an example, a piston structure is arranged in a valve body, a first interface, a second interface, a third interface and a fourth interface are circumferentially arranged in the valve body, the first interface is communicated with a compressor outlet, and the fourth interface is communicated with a compressor inlet. When the first interface is communicated with the second interface, the third interface is communicated with the fourth interface, a first channel is formed between the first interface and the second interface, a second channel is formed between the third interface and the fourth interface, and the piston structure isolates the first channel from the second channel; when the reversing is needed, the first channel is high pressure, the second channel is low pressure, and the piston structure needs to overcome pressure difference during reversing, so that the movement resistance of the piston structure is increased, and the reversing is failed or the piston structure is blocked.

The existing four-way reversing valve with another structure, such as a household four-way valve, is provided with a first interface arranged on one side of a valve body, a second interface, a third interface and a fourth interface arranged on the other side of the valve body, a piston structure slides along a valve seat, a cavity is arranged in the piston structure and is communicated with a compressor inlet, the first interface is communicated with a compressor outlet, the upper end of the piston structure is subjected to larger pressure, and the piston structure can be tightly attached to the valve seat to slide due to pressure difference during reversing, so that reversing is difficult and even noise can be generated during reversing.

Referring to fig. 1, the switching valve 100 of the present invention includes a valve body 10 and a rotary tube 20, wherein the valve body 10 has a valve cavity 11, the rotary tube 20 is disposed in the valve cavity 11, and at least a first port 12, a second port 13, a third port 14 and a fourth port 15 are disposed on the valve body 10. The rotary tube 20 is disposed in the valve cavity 11, one end of the rotary tube 20 is connected to the first connector 12, and the rotary tube 20 can rotate, so that the other end of the rotary tube 20 can be selectively communicated with the second connector 13 or the third connector 14, thereby realizing the reversing function. It should be noted that, in this embodiment, the switching valve 100 is a four-way reversing valve, the valve body 10 is further provided with a fourth interface 15, the first interface 12 is connected to an outlet or an inlet of the compressor, the fourth interface 15 is connected to the inlet or the outlet of the compressor, the second interface 13 is connected to the first heat exchanger, and the third interface 14 is connected to the second heat exchanger; when the first port 12 is connected to the compressor outlet, the fourth port 15 is connected to the compressor inlet, and when the first port 12 is connected to the compressor inlet, the fourth port 15 is connected to the compressor outlet. In other embodiments, the switching valve 100 may also be a three-way valve, a five-way valve, or the like.

The rotary tube 20 is internally provided with a first channel 21, one end of the first channel 21 is communicated with the first interface 12, and the other end is communicated with the second interface 13 or the third interface 14; the valve cavity 11 includes a second channel 111, the second channel 111 is respectively communicated with the fourth interface 15 and the second interface 13 or the third interface 14, the second channel 111 is arranged around the first channel 21, that is, the first channel 21 is arranged in the second channel 111, and in the process of rotating the rotating tube 20, the end surface of one end of the rotating tube 20 away from the first interface 12 is always attached to the inner wall of the valve body 10. When the rotary tube 20 is in communication with the second port 13, the second passage 111 is in communication with the third port 14, and when the rotary tube 20 is in communication with the third port 14, the second passage 111 is in communication with the second port 13.

It can be appreciated that, in the switching valve 100 of the present invention, the second channel 111 surrounds the first channel 21, the circumferential pressure of the rotating tube 20 is consistent, and no force for preventing the rotating tube 20 from rotating and reversing is generated due to the pressure, so that the rotating tube 20 can rotate and reverse only by overcoming the friction force between the two ends of the rotating tube 20 and the inner wall of the valve body 10 during the rotation process, and the movement resistance is greatly reduced, so that the reversing is smoother; and the end surface of the rotating pipe 20 far away from the first connector 12 is always attached to the inner wall of the valve body 10 in the rotating process, so that the problem of mutual blowby of media between the first channel 21 and the second channel 111 is relieved, the blowby is reduced, and the energy efficiency of the refrigerating system and the working stability of the compressor are improved.

Further, the second port 13 and the third port 14 are located at the same end of the valve body 10, and the first port 12 is disposed opposite to the second port 13 and the third port 14, respectively. In the rotating process of the rotating pipe 20, the rotating path is short, the reversing rapidity is realized, and in the rotating process, excessive bending is not needed, so that the rotating pipe 20 can be always attached to the inner wall of the valve body 10 in the rotating process. Moreover, since the circumferential pressure applied to the inner wall of the first channel 21 is uniform, the pressure difference between the first channel 21 and the second channel 111 does not generate pressure on the two ends of the rotating tube 20, that is, the rotating tube 20 is not pressed downwards, so that the end of the rotating tube 20 away from the first interface 12 is not lifted, the tightness between the first channel 21 and the second channel 111 is enhanced, and meanwhile, the friction force when the end surface of the rotating tube 20 away from the end of the first interface 12 rotates is reduced.

The bottom wall inside the valve body 10 is a plane 17, the second port 13 and the third port 14 are opened on the plane 17, and the rotating pipe 20 can move along the plane 17 in the rotating process, so that the first channel 21 and the second channel 111 are kept isolated as far as possible.

The first connecting pipe 121 is arranged at the first interface 12, the second connecting pipe 131 is arranged at the second interface 13, the third connecting pipe 141 is arranged at the third interface 14, and the fourth connecting pipe 151 is arranged at the fourth interface 15. The first connection pipe 121, the second connection pipe 131, the third connection pipe 141 and the fourth connection pipe 151 are used for connecting with a pipeline of a refrigerating system.

In this embodiment, the valve body 10 is made of aluminum alloy, and has light weight, good sealing performance and high strength, and the first connecting pipe 121, the second connecting pipe 131, the third connecting pipe 141 and the fourth connecting pipe 151 are all copper pipes, so that the valve body is convenient to weld with pipelines of a refrigeration system.

Referring to fig. 2, a sealing groove 22 is formed in the end surface of the end, far away from the first interface 12, of the rotating pipe 20, a sealing piece 23 is arranged in the sealing groove 22, the sealing piece 23 is abutted against the plane 17, and the sealing piece 23 can strengthen the tightness between the first channel 21 and the second channel 111. The seal member 23 can seal the first passage 21 and the second passage 111 from internal leakage when the rotating pipe 20 is not rotated.

The end of the rotating pipe 20, which is close to the first connector 12, is provided with a second adapter 25, and the rotating pipe 20 is rotatably connected with the inner wall of the valve body 10 through the second adapter 25.

The one end that the rotation pipe 20 kept away from first interface 12 is equipped with first adaptor 24, and the one end that the rotation pipe 20 kept away from first interface 12 is provided with extension axle 26, and the one end that extension axle 26 is close to first interface 12 and rotation pipe 20 fixed connection, first adaptor 24 are connected with the one end that extension axle 26 kept away from first interface 12 and valve body 10 inner wall respectively, and extension axle 26 is connected with valve body 10 inner wall rotation through first adaptor 24, and extension axle 26 can encircle first adaptor 24 rotation. So that the rotating tube 20 does not displace at the joint with the extension shaft 26 during the rotation, and the other side rotates around the extension shaft 26 and moves to another interface, thereby facilitating the accurate positioning of the rotating tube 20 to the corresponding interface.

In an embodiment, the first adapter 24 and the second adapter 25 are rolling bearings, the plane 17 is provided with a mounting groove 171, the mounting groove 171 is located between the second interface 13 and the third interface 14, one end of the extension shaft 26 away from the first interface 12 is connected to the inner side of one of the rolling bearings, and the outer side wall of the rolling bearing is connected to the groove wall of the mounting groove 171; one end of the rotating tube 20, which is close to the first interface 12, is penetrated in another rolling bearing and is connected with the inner wall of the rolling bearing, the outer wall of the rolling bearing is connected with the inner wall of the valve body 10, and the friction force during the rotation of the rotating tube 20 can be reduced through the first adapter 24 and the second adapter 25. In other embodiments, the first adapter 24 and the second adapter 25 may also be a sleeve, or the first adapter 24 is a rolling bearing, the second adapter 25 is a sleeve, or the first adapter 24 is a sleeve, and the second adapter 25 is a rolling bearing.

The first adapter 24 and the second adapter 25 are coaxially disposed so that both ends of the rotating tube 20 do not twist with each other during rotation.

Referring to fig. 4, the switching valve 100 further includes a driving assembly 30, where the driving assembly 30 is at least partially connected to the rotating tube 20 for driving the rotating tube 20 to rotate.

The driving assembly 30 comprises a driving member 31, a first wheel 32 and a second wheel 33, the first wheel 32 is sleeved on the outer side of one end of the rotating tube 20, the second wheel 33 is connected to the driving member 31, the second wheel 33 is in transmission connection with the first wheel 32, the driving member 31 drives the second wheel 33 to rotate and drives the first wheel 32 to rotate, so that the rotating tube 20 is driven to rotate. The second wheel 33 can be made smaller by the transmission achieved by the two gears, and the driving force can be saved by rotating the large first wheel 32 by the small second wheel 33. In addition, the switching valve 100 of the present invention can be driven without using a differential pressure to realize a change-over, thereby expanding the application.

In one embodiment, the driving member 31 is a motor, which is small in size. In other embodiments, the driving member 31 may also be a driving member such as a rotary cylinder, which is capable of driving the second wheel 33 to rotate.

In one embodiment, the first wheel 32 and the second wheel 33 are gears, and the transmission is realized through gear meshing, so that the overall volume of the switching valve 100 can be reduced, and in other embodiments, the first wheel 32 and the second wheel 33 can also be pulleys, and the transmission is realized between the two pulleys through a belt.

The valve body 10 is internally provided with the accommodating groove 18, the first wheel 32 is arranged in the accommodating groove 18, and the groove wall of the accommodating groove 18 plays a supporting role on the first wheel 32, so that the rotating tube 20 is supported; the second adaptor 25 abuts against the first wheel 32, and the first wheel 32 plays a supporting role for the second adaptor 25.

The first wheel 32 and the rotating tube 20 may be integrally provided or may be separately provided and fixedly connected by welding.

The valve chamber 11 further includes a third chamber 112, the third chamber 112 being isolated from the second passage 111 such that the driver 31 is disposed in the third chamber 112 to operate normally. The driving member 31 is disposed in the third chamber 112, thereby ensuring the integrity of the switching valve 100 and avoiding mess of parts. Of course, in other embodiments, the driving member 31 may be disposed outside the valve body 1, so as to facilitate maintenance.

In another embodiment, the driving assembly 30 may be provided at one end of the valve body 10 where the mounting groove 171 is provided. The driving member 31 is fixedly installed on the valve body 10, an output shaft of the driving member 31 is directly fixedly connected with the extension shaft 26, and the driving member 31 can drive the extension shaft 26 to rotate so as to enable the rotating tube 20 to rotate the switching valve 100 for reversing. Of course, the drive assembly 30 is also driven in rotation by the motor in conjunction with the gear to extend the shaft 26, as not limited herein.

The invention also provides a refrigerating system comprising a compressor, a first heat exchanger, a second heat exchanger and the switching valve 100.

The first connection pipe 121 of the switching valve 100 is connected to the compressor outlet or the compressor inlet, the second connection pipe 131 is connected to the first heat exchanger, the third connection pipe 141 is connected to the second heat exchanger, and the fourth connection pipe 151 is connected to the compressor inlet or the compressor outlet.

When the refrigeration system is in the refrigeration mode or the defrosting mode, the rotary pipe 20 rotates to the second port 13, the first channel 21 is communicated with the first port 12 and the first heat exchanger, and the second channel 111 is communicated with the fourth port 15 and the third port 14. When the first connecting pipe 121 is connected with the compressor inlet, the fourth connecting pipe 151 is connected with the compressor outlet, the first heat exchanger is an evaporator, the second heat exchanger is a condenser, one path of medium enters the first channel 21 from the second interface 13, flows into the compressor inlet from the first interface 12, one path of medium enters the second channel 111 from the fourth interface 15, and enters the second heat exchanger from the third interface 14; when the first connection pipe 121 is connected to the compressor outlet, the fourth connection pipe 151 is connected to the compressor inlet, the first heat exchanger is a condenser, the second heat exchanger is an evaporator, a medium enters the first channel 21 from the first interface 12, flows out to the first heat exchanger from the second interface 13, and a medium enters the second channel 111 from the third interface 14 and enters the compressor from the fourth interface 15.

When the refrigeration system is in the heating mode, the rotary tube 20 rotates to the third port 14, the first channel 21 is communicated with the first port 12 and the second heat exchanger, and the second channel 111 is communicated with the fourth port 15 and the second port 13. When the first connecting pipe 121 is connected with the inlet of the compressor, the fourth connecting pipe 151 is connected with the outlet of the compressor, the first heat exchanger is a condenser, the second heat exchanger is an evaporator, one path of medium enters the first channel 21 from the third interface 14, enters the compressor from the first interface 12, one path of medium enters the first channel 21 from the fourth interface 15, and flows out to the first heat exchanger from the second interface 13; when the first connecting pipe 121 is connected with the compressor outlet, the fourth connecting pipe 151 is connected with the compressor inlet, the first heat exchanger is an evaporator, the second heat exchanger is a condenser, one path of medium enters the first channel 21 from the first interface 12, enters the second heat exchanger from the third interface 14, one path of medium enters the first channel 21 from the second interface 13, and flows out to the compressor from the fourth interface 15.

In operation, when the refrigeration system is in a refrigeration mode, one medium enters the second channel 111 and one medium enters the first channel 21; when the heating mode needs to be switched, the driving piece 31 drives the first wheel 32 to rotate, drives the rotary tube 20 to rotate, and the rotary tube 20 rotates to the third interface 14 against the inner wall of the valve body 10, so that the first channel 21 is communicated with the third interface 14, and the second channel 111 is communicated with the second interface 13, and the reversing is realized. In the reversing process, the end face of one end of the rotating pipe 20 is attached to the inner wall of the valve body 10, so that the problem of blowby between the first channel 21 and the second channel 111 is relieved, and the medium in the second channel 111 circulates around the circumference of the rotating pipe 20, so that the circumferential stress of the rotating pipe 20 is consistent, and the resistance applied to the rotating pipe 20 during rotation can be saved.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims (11)

1. The switching valve is characterized by comprising a valve body (10) and a rotating pipe (20), wherein at least a first interface (12), a second interface (13) and a third interface (14) are formed in the valve body (10), one end of the rotating pipe (20) is connected to the first interface (12), and the rotating pipe (20) can rotate so that the first interface (12) is selectively communicated with the second interface (13) or the third interface (14) through the rotating pipe (20);

the rotary pipe (20) is internally provided with a first channel (21), the valve body (10) is internally provided with a second channel (111) communicated with the second interface (13) or the third interface (14), the second channel (111) is arranged around the first channel (21), and in the process of rotating the rotary pipe (20), the end face of the rotary pipe (20) away from the first interface (12) is attached to the inner wall of the valve body (10).

2. The switching valve according to claim 1, characterized in that the second port (13) and the third port (14) are located at the same end of the valve body (10), and the first port (12) is arranged opposite to the second port (13) and the third port (14), respectively.

3. Switching valve according to claim 1, characterized in that the bottom wall inside the valve body (10) is a plane (17), the second interface (13) and the third interface (14) being open in the plane (17).

4. A switching valve according to claim 3, wherein the end surface of the end of the rotary pipe (20) far away from the first interface (12) is provided with a sealing groove (22), a sealing element (23) is arranged in the sealing groove (22), and the sealing element (23) is abutted with the plane (17).

5. The switching valve according to claim 1, wherein a first adapter (24) is provided at an end of the rotary tube (20) remote from the first port (12), and one side of the rotary tube (20) is rotatably connected to the bottom wall of the valve body (10) through the first adapter (24) so that the rotary tube (20) can rotate around the first adapter (24).

6. The switching valve according to claim 1, characterized in that the end of the rotary tube (20) close to the first port (12) is provided with a second adapter (25) and is rotatably connected with the inner wall of the valve body (10) by means of the second adapter (25).

7. The switching valve according to claim 1, further comprising a drive assembly (30), at least part of the drive assembly (30) being connected to the rotating tube (20) for driving the rotating tube (20) in rotation.

8. The switching valve according to claim 7, wherein the driving assembly (30) comprises a first wheel (32), and the first wheel (32) is sleeved outside the rotating tube (20) and is located at one end of the rotating tube (20) close to the first interface (12).

9. The switching valve according to claim 8, wherein the driving assembly (30) further comprises a driving member (31) and a second wheel (33), the valve body (10) further comprises a third cavity (112), the third cavity (112) is isolated from the second channel (111), the driving member (31) is arranged in the third cavity (112), and the second wheel (33) is connected to the driving member (31) and is in transmission connection with the first wheel (32).

10. A refrigeration system comprising a switching valve according to any one of claims 1-9, wherein the refrigeration system comprises a compressor, a first heat exchanger and a first heat exchanger, the valve body (10) is further provided with a fourth interface (15), two ends of the compressor are respectively communicated with the first interface (12) and the fourth interface (15), the second interface (13) is communicated with the first heat exchanger, and the third interface (14) is communicated with the first heat exchanger.

11. A refrigeration system according to claim 10, wherein the rotary tube (20) communicates with the second port (13) and the third port (14) communicates with the fourth port (15) through the second passage (111) when the refrigeration system is in a refrigeration mode or a defrost mode; when the refrigerating system is in a heating mode, the rotating pipe (20) is communicated with the third interface (14), and the second interface (13) is communicated with the fourth interface (15) through the second channel (111).

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