Switching valve

Abstract

The invention provides a switching valve. The switching valve comprises a main valve assembly. The main valve assembly comprises a valve body, a valve seat and a first sealing piece. At least part of the valve seat is located in the containing cavity of the valve body and provided with a valve seat channel. The valve seat channel is communicated with a valve body channel of the valve body, and the valve body channel is communicated with the pilot valve; the wall forming the containing cavity comprises a first side face part, and the part, located in the containing cavity, of the valve seat comprises a second side face part. The valve body channel is provided with a first opening portion on the first side face portion, the valve seat channel is provided with a second opening portion on the second side face portion, and at least part of the first opening portion and the second opening portion are opposite and communicated. One side of the first sealing piece is in contact with the first side face part, the other side of the first sealing piece is in contact with the second side face part, the part, in contact with the first side face part, of the first sealing piece is defined as a first sealing part, the part, in contact with the second side face part, of the first sealing piece is defined as a second sealing part, and the first sealing part surrounds the peripheral side of the first opening part; and the second sealing part surrounds the peripheral side of the second opening part.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid control, and in particular to a switching valve. Background Art

[0002] In the related art, a switching valve can be applied to a refrigeration system. The switching valve includes a valve body assembly and an electromagnetic pilot valve. The electromagnetic pilot valve is used to control the valve body assembly to switch the flow direction of the refrigerant.

[0003] The valve body assembly requires two or more components and a number of flow channels. The flow channels form openings between at least two components that need to be butted against each other. There may be sealing problems between the butted openings, causing leakage. Summary of the invention

[0004] An object of the present invention is to provide a new technical solution for a switching valve, which can reduce leakage of the switching valve.

[0005] One embodiment of the present invention provides a switching valve, including a main valve assembly and a pilot valve, wherein the main valve assembly includes a valve body, a valve seat and a first sealing member; the valve body has a accommodating cavity, at least part of the valve seat is located in the accommodating cavity, and the valve seat has a valve seat channel; the valve body has a valve body channel, the valve seat channel is connected to the valve body channel, and the valve body channel is connected to the pilot valve; the wall forming the accommodating cavity includes a first side portion, and the part of the valve seat located in the accommodating cavity includes a second side portion; the valve body channel has a first opening portion on the first side portion, and the valve seat channel has a second opening portion on the second side portion, and at least part of the first opening portion is opposite to and connected to the second opening portion; one side of the first sealing member contacts the first side portion, and the other side of the first sealing member contacts the second side portion, the part of the first sealing member contacting the first side portion is defined as the first sealing member, and the part of the first sealing member contacting the second side portion is defined as the second sealing member, the first sealing member surrounds the outer peripheral side of the first opening portion, and the second sealing member surrounds the outer peripheral side of the second opening portion.

[0006] This embodiment reduces leakage at the junction of the first port and the second port by disposing a first seal between the first side portion and the second side portion and surrounding the first seal around the outer circumference of the first port and the second port, thereby improving the performance of the switching valve.

[0007] Other features and advantages of the present specification will become apparent from the following detailed description of exemplary embodiments of the present specification with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The accompanying drawings incorporated in and forming a part of this specification illustrate embodiments of the specification and, together with the description thereof, serve to explain the principles of the specification.

[0009] Figure 1 It is a schematic structural diagram of a switching valve in an embodiment of the present invention;

[0010] Figure 2 is Figure 1 an exploded view of a partial structure of

[0011] Figure 3 is Figure 1 a side sectional view of , first perspective;

[0012] Figure 4 is Figure 1 a side sectional view of , second perspective;

[0013] Figure 5 is Figure 4 a partial enlarged view of , one of them;

[0014] Figure 6 is Figure 1 a side view of a partial structure of ;

[0015] Figure 7 is Figure 6 a side sectional view taken along the A-A direction in ;

[0016] Figure 8 It is a schematic structural diagram of a connection component of the switching valve;

[0017] Figure 9 is Figure 4 a partial enlarged view of , two of them.

[0018] Explanation of reference numerals:

[0019] 100, switching valve; 10, main valve assembly; 20, pilot valve; 1, valve body; 1a, cylindrical part; 1b, protruding part; 11, slider; 111, communication channel; 12, accommodation cavity; 121, first sub-cavity; 122, second sub-cavity; 123, third sub-cavity; 124, first side surface part; 124a, first port; 13, connection part; 14, connecting rod; 15, piston; 2, valve seat; 21, stepped surface; 22, second side surface part; 22a, second port; 23, third side surface part; 31, first seal; 32, accommodation groove; 32a, chamfer; 32c, first stop wall; 32d, second stop wall; 4, connection component; 41, first communication flow channel; 42, second communication flow channel; 4a, fourth side surface part; 41a, fourth port; 43, third communication flow channel; 44, fourth communication flow channel; 51, second flow channel; 52, first flow channel; 53, third flow channel; 52a, valve seat channel; 52b, valve body channel. Detailed Description of the Invention

[0020] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0021] like Figure 1 , Figure 2 and Figure 3 As shown, the switching valve 100 includes a main valve assembly 10 and a pilot valve 20. The main valve assembly 10 includes a valve body 1, a valve seat 2 and a first sealing member 31. The valve seat 2 has a first flow channel 52, the valve body 1 has a receiving cavity 12, the slider 11 is located in the receiving cavity 12, the slider 11 has a communication channel 111, and the communication channel 111 is connected to the first flow channel 52.

[0022] At least part of the valve seat 2 is located in the accommodating cavity 12 and is sealed and connected to the valve body 1. The part of the valve seat 2 located in the accommodating cavity 12 has a valve seat channel 52a, and the valve seat channel 52a is connected to the first flow channel 52. The valve body 1 has a valve body channel 52b, and the valve seat channel 52a is connected to the valve body channel 52b, and the valve body channel 52b is connected to the pilot valve 20.

[0023] See also Figure 4 and Figure 5 The wall forming the accommodating cavity 12 includes a first side surface portion 124. The portion of the valve seat 2 located in the accommodating cavity 12 includes a second side surface portion 22, which is disposed opposite to the first side surface portion 124 and forms a clearance fit.

[0024] like Figure 5 , Figure 6 and Figure 7 As shown, the valve body channel 52b has a first opening 124a on the first side portion 124, and the valve seat channel 52a has a second opening 22a on the second side portion 22, and at least a portion of the first opening 124a is opposite to and communicates with the second opening 22a.

[0025] Specifically, the valve body passage 52b penetrates the first side surface portion 124 to form a first opening portion 124a, and the valve seat passage 52a penetrates the second side surface portion 22 to form a second opening portion 22a. The first opening portion 124a is connected to the second opening portion 22a.

[0026] One side of the first seal 31 contacts the first side portion 124, and the other side of the first seal 31 contacts the second side portion 22. The portion of the first seal 31 in contact with the first side portion 124 is defined as the first sealing portion, and the portion of the first seal 31 in contact with the second side portion 22 is defined as the second sealing portion. The first sealing portion is defined to surround the outer peripheral side of the first mouth portion 124a, and the second sealing portion is defined to surround the outer peripheral side of the second mouth portion 22a.

[0027] In this embodiment, a first seal 31 is provided between the first side face 124 and the second side face 22, and the first seal 31 surrounds the outer peripheral sides of the first opening 124a and the second opening 22a, thereby sealing the first opening 124a and the second opening 22a, effectively avoiding leakage at the position where the first opening 124a and the second opening 22a are butted against each other.

[0028] In a specific example, the first seal 31 is an elastic member. The elastic member is annular. The elastic member is tightly pressed between the first side face 124 and the second side face 22 and applies elastic force to the first side face 124 and the second side face 22. The elastic member can be made of rubber material.

[0029] The part of the elastic member that is pressed against the first side face 124 is the first seal part, and the part of the elastic member that is pressed against the second side face 22 is the second seal part.

[0030] At this time, in order to connect the valve seat 2 and the valve body 1, it is only necessary to weld the edges where the valve seat 2 and the valve body 1 are in contact. Under the action of the first side face 124 and the second side face 22, the first seal 31 seals the first opening 124a and the second opening 22a.

[0031] Specifically, as Figure 5 and Figure 7 shown, the valve body 1 includes a cylindrical portion 1a and a protruding portion 1b. Along the radial direction of the cylindrical portion 1a, the protruding portion 1b protrudes outward from the outer peripheral wall of the cylindrical portion 1a, and the first side face 124 is the inner side wall of the protruding portion 1b. The protruding portion 1b is integrally formed or fixedly connected with the cylindrical portion 1a. The second side face 124 is the outer peripheral wall of the part of the valve seat 2 located in the accommodation cavity 12, and the first side face 124 and the second side face 22 are opposite and in clearance fit.

[0032] Before assembling the main valve assembly 10, the valve seat 2 and the valve body 1 are in a split structure. A part of the valve seat 2 is inserted into the protruding portion 1b. The valve seat 2 is formed with a stepped surface 21. When assembling the main valve assembly 10, in the insertion direction, the end face of the protruding portion 1b away from the cylindrical portion 1a abuts against the stepped surface 21, and laser welding is performed at the position where the two abut.

[0033] Thus, by providing the protruding portion 1b, during the process of inserting the valve seat 2 into the receiving cavity 12, the protruding portion 1b plays a role in limiting and guiding the valve seat 2. In addition, the stepped surface 21 of the valve seat 2 can increase the contact surface between the protruding portion 1b and the valve seat 2 in the insertion direction, and can also provide a welding position for laser welding, which is convenient for operation. When laser welding the valve seat 2 and the valve body 1, the weld seam is located between the protruding portion 1b and the stepped surface 21. Laser welding generally does not use solder. Even if a small amount of solder is used, almost no solder can penetrate between the first side surface portion 124 and the second side surface portion 22. Therefore, after welding, there may still be a gap between the first side surface portion 124 and the second side surface portion 22. In addition, compared with the solution where the communication component 4 is directly connected to the valve seat 2 after crossing the weld seam, in the present application, the communication component 4 only needs to be welded to one part of the valve body 1, which is beneficial to the fitting of the welding surface, and the communication component 4 does not block the above-mentioned weld seam, thus facilitating the incidence of laser and facilitating laser welding.

[0034] In another specific example, the first seal 31 is a welding ring. The welding ring is the solder during the furnace welding process. The first side surface portion 124 and the second side surface portion 22 are connected by the welding ring. The first sealing portion is the part where the welding ring is welded to the first side surface portion 124, and the second sealing portion is the part where the welding ring is welded to the second side surface portion 22.

[0035] At this time, the valve body 1 and the valve seat 2 can be connected by furnace welding. During the furnace welding process, after the welding ring melts, it connects the first side surface portion 124 and the second side surface portion 22 respectively. The part where the welding ring is welded to the first side surface portion 124 is the first sealing portion, and this welded part is arranged around the first opening 124a. Similarly, the part where the welding ring is welded to the second side surface portion 22 is the second sealing portion, and this welded part is arranged around the second opening 22a. Thus, the first opening 124a and the second opening 22a are sealed from the outside through the welding ring, and further the first flow channel 52 is sealed.

[0036] By adopting the method in this embodiment, the first seal 31 can adapt to different welding methods and provides more selectable sealing methods for different connection methods of the switching valve 100. In addition, setting the first seal 31 as a welding ring enables the first seal 31 to play a sealing role while serving as solder.

[0037] In a specific example, as Figures 1-3 shown, the first flow channel 52 forms an opening in the valve seat 2 to connect to the low-pressure medium source, so as to transmit the low-pressure medium to the communication channel 111, and the communication channel 111 is a low-pressure cavity.

[0038] The accommodation cavity 12 of the valve body 1 includes a first sub-cavity 121, and the first sub-cavity 121 is connected to a high-pressure medium source. The slider 11 provided with a communication channel 111 is located in the first sub-cavity 121. The first sub-cavity 121 does not include the space occupied by the valve seat 2.

[0039] If no first seal 31 is provided between the first side face 124 and the second side face 22, the high-pressure medium in the first sub-cavity 121 will leak into the first flow channel 52 through the gap between the first side face 124 and the second side face 22.

[0040] In this embodiment, the first seal 31 can be a closed ring, square or other shape, as long as it can surround the first opening 124a and the second opening 22a.

[0041] Optionally, continue to refer to Figure 5 In order to accommodate the first seal 31, the main valve assembly 10 further has a receiving groove 32, and at least a part of the first seal 31 is located in the receiving groove 32. In this embodiment, the receiving groove 32 is recessed in the direction away from the first side face 124 of the second side face 22 to form. In other embodiments, the receiving groove 32 is recessed in the direction away from the second side face 22 of the first side face 124 to form, or a part of the receiving groove 32 is recessed in the direction away from the second side face 22 of the first side face 124 to form, and another part of the receiving groove 32 is recessed in the direction away from the first side face 124 of the second side face 22 to form.

[0042] The receiving groove 32 is formed by stamping or machining on the outer peripheral side of the first opening 124a, and the receiving groove 32 is located on the first side face 124.

[0043] Or the receiving groove 32 is formed on the outer peripheral side of the second opening 22a, and the receiving groove 32 is located on the second side face 22.

[0044] Or a part of the receiving groove 32 is located on the first side face 124, and a part is located on the second side face 22, and the first seal 31 is located in the receiving space surrounded by the receiving groove 32.

[0045] Those skilled in the art can set the position of the receiving groove 32 according to needs, so that while the first seal 31 can be accommodated, the first seal 31 can be pressed against between the first side face 124 and the second side face 22. Accommodating the first seal 31 through the receiving groove 32 plays a role in positioning the first seal 31 during the installation process.

[0046] Optionally, define the direction in which the first seal 31 contacts the first side face 124 and the second side face 22 as the first direction, and the direction perpendicular to the first direction as the second direction.

[0047] Such asFigure 9 As shown, the receiving groove 32 is a recess, and the recess is spaced apart from the first opening 124a and the second opening 22a in the second direction. The walls forming the recess include a first stop wall 32c and a second stop wall 32d. The first stop wall 32c and the second stop wall 32d extend in the first direction and are oppositely arranged in the second direction. The first stop wall 32c cooperates with the inner ring side of the first seal 31, and the second stop wall 32d cooperates with the outer ring side of the first seal 31.

[0048] Or, as Figure 5 shown, the receiving groove 32 is a stepped groove, and the stepped groove is connected to the first opening 124a and the second opening 22a in the second direction, and the stepped groove communicates with the first opening 124a and the second opening 22a.

[0049] The wall forming the stepped groove includes a third stop wall, and the third stop wall cooperates with the inner ring side of the first seal 31. By providing the recess or the stepped groove, at least part of the first seal 31 can be received, and at the same time, a stop fit can be formed on at least the outer ring side of the first seal 31 to prevent the first seal 31 from being misaligned.

[0050] As Figure 5 shown, a chamfer 32a is formed at the notch position of the receiving groove 32 to facilitate the placement of the first seal 31.

[0051] Optionally, the first seal 31 can be in contact with the outer peripheral sides of the first opening 124a and the second opening 22a, or can be spaced from the outer peripheral sides of the first opening 124a and the second opening 22a. No specific limitation is made here, and it shall be subject to the actual design requirements of those skilled in the art.

[0052] Optionally, as Figure 4 and Figure 5 shown, the radial dimension of the valve seat passage 52a is larger than the radial dimension of the valve body passage 52b; or the radial dimension of the valve seat passage 52a is smaller than the radial dimension of the valve body passage 52b. By forming a difference in the inner diameter dimensions of the valve seat passage 52a and the valve body passage 52b, the positioning requirements between the valve body 1 and the valve seat 2 can be reduced, and the docking accuracy between the first opening 124a and the second opening 22a can be reduced.

[0053] In other embodiments of the switching valve 100, such as Figure 1 、 Figure 4 and Figure 8As shown, the switching valve 100 further includes a connecting component 4, and the connecting component 4 has a fourth side surface 4a. The fourth side surface 4a is fixedly connected to the outer peripheral wall of the valve body 1. The connecting component 4 at least includes a first connecting flow channel 41 and a second connecting flow channel 42. At least a part of the accommodating cavity 12 is connected to the pilot valve 20 through the first connecting flow channel 41, and the first flow channel 52 is connected to the pilot valve 20 through the second connecting flow channel 42;

[0054] A groove structure is formed on the fourth side surface 4a, and the groove structure serves as one of the first connecting flow channel 41 and the second connecting flow channel 42, and the other of the first connecting flow channel 41 and the second connecting flow channel 42 forms at least a fourth opening 41a on the fourth side surface 4a. By forming a groove on the fourth side surface 4a to replace the capillary tube externally disposed on the main valve assembly 10, the complexity of the main valve assembly 10 can be significantly reduced, and the structural strength of the main valve assembly 10 can be improved.

[0055] Of course, it is also possible to form a plurality of mutually isolated groove structures on the fourth side surface 4a to replace the many capillary tubes of the traditional main valve assembly 10.

[0056] In addition, both the first connecting flow channel 41 and the second connecting flow channel 42 can be groove structures, which will not be elaborated here.

[0057] In this embodiment, the fourth side surface 4a is welded to the outer peripheral wall of the valve body 1. Specifically, welding is performed by directly coating solder on the fourth side surface 4a or the outer periphery of the valve body 1.

[0058] Alternatively, a second sealing member is provided between the fourth side surface 4a and the outer peripheral wall of the valve body 1, and the second sealing member is disposed around the outside of the groove structure and / or around the outer periphery of the second opening 22a. The second sealing member is an elastic member. Thus, a seal can be formed between the groove structure and the second opening 22a.

[0059] Please refer to the description of the first sealing member 31 above to understand the second sealing member. The structure and type of the second sealing member are the same as those of the first sealing member 31, which will not be elaborated here.

[0060] In order to accommodate the second sealing member, the aforementioned accommodating groove is also formed on the fourth side surface 4a and / or the outer peripheral wall of the valve body 1. For the specific structure of the accommodating groove, refer to the accommodating groove of the first sealing member 31 for understanding, which will not be elaborated here.

[0061] Those skilled in the art can select the type of the first sealing member 31 according to the welding method between the connecting component 4 and the valve body 1 with reference to the foregoing content.

[0062] In another embodiment of the switching valve 100, as Figure 1 and Figure 2As shown, the main valve assembly 10 further includes a connecting pipe portion 13, and the flow channel of the connecting pipe portion 13 communicates with the first sub-chamber 121. In one embodiment, the flow channel of the connecting pipe portion 13 communicates with the high-pressure side in the refrigeration cycle, the first flow channel 52 communicates with the low-pressure side in the refrigeration cycle, and the first seal 31 fluidly separates the valve body channel 52b from the first sub-chamber 121. By providing the first seal 31, the communication between the high-pressure side and the low-pressure side in the refrigeration cycle through the gap between the first side surface portion 124 and the second side surface portion 22 is reduced, thereby improving the efficiency of the refrigeration cycle.

[0063] Before assembling the main valve assembly 10, the connecting pipe portion 13 and the valve body 1 are of a split structure. The connecting pipe portion 13 and the valve body 1 are hermetically connected by welding, riveting, clamping or other means. Thus, the complexity of the valve body 1 is simplified and the processing is facilitated.

[0064] Specifically, referring to Figure 2 and Figure 3 , a connecting rod 14 is provided in the valve body 1, and a slider 11 is provided on the connecting rod 14. A piston 15 is provided at each end of the connecting rod 14. The first sub-chamber 121 is located between the two pistons 15. The accommodating chamber 12 further includes a second sub-chamber 122 and a third sub-chamber 123. The second sub-chamber 122 is located on the side of the first sub-chamber 121 away from the third sub-chamber 123, and the third sub-chamber 123 is located on the side of the first sub-chamber 121 away from the second sub-chamber 122. A pressure difference can be formed between the second sub-chamber 122 and the third sub-chamber 123 to push the slider 11 to move.

[0065] The valve seat 2 includes a third side surface portion 23, and the third side surface portion 23 is used for sliding cooperation with the slider 11. The valve seat 2 further has a second flow channel 51 and a third flow channel 53, and openings are formed in the third side surface portion 23 for the second flow channel 51, the first flow channel 52, and the third flow channel 53.

[0066] When the slider 11 is in the first working position, the second flow channel 51 communicates with the first flow channel 52 through the communication channel 111, and the third flow channel 53 communicates with the first sub-chamber 121. When the slider 11 is in the second working position, the first flow channel 52 communicates with the third flow channel 53 through the communication channel 111, and the second flow channel 51 communicates with the first sub-chamber 121.

[0067] The pilot valve 20 is provided with four interfaces, namely a high-pressure inlet, a low-pressure inlet, a first outlet, and a second outlet. The connecting component 4 further includes a third connecting flow channel 43 and a fourth connecting flow channel 44. The first sub-chamber 121 is connected to the high-pressure inlet through the first connecting flow channel 41. The first flow channel 52 is connected to the low-pressure inlet through the second connecting flow channel 42. The second sub-chamber 122 is connected to the first outlet through the third connecting flow channel 43, and the third sub-chamber 123 is connected to the second outlet through the fourth connecting flow channel 44.

[0068] In this article, specific examples are used to elaborate on the principles and implementation modes of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principles of the present invention, several improvements and modifications can still be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A switching valve, characterized in that, It includes a main valve assembly (10) and a pilot valve (20). The main valve assembly (10) includes a valve body (1), a valve seat (2), and a first seal (31). The valve body (1) has a receiving cavity (12), at least part of the valve seat (2) is located in the receiving cavity (12), and the valve seat (2) has a valve seat passage (52a). The valve body (1) has a valve body passage (52b). The valve seat passage (52a) communicates with the valve body passage (52b), and the valve body passage (52b) communicates with the pilot valve (20). The wall forming the receiving cavity (12) includes a first side surface portion (124), and the part of the valve seat (2) located in the receiving cavity (12) includes a second side surface portion (22). The valve body passage (52b) has a first opening (124a) on the first side surface portion (124), and the valve seat passage (52a) has a second opening (22a) on the second side surface portion (22). At least part of the first opening (124a) is opposite to and communicates with the second opening (22a). One side of the first seal (31) contacts the first side surface portion (124), and the other side of the first seal (31) contacts the second side surface portion (22). The part of the first seal (31) contacting the first side surface portion (124) is defined as the first seal part, and the part of the first seal (31) contacting the second side surface portion (22) is defined as the second seal part. The first seal part surrounds the outer peripheral side of the first opening (124a), and the second seal part surrounds the outer peripheral side of the second opening (22a).

2. The switching valve according to claim 1, wherein At least part of the first side surface portion (124) is opposite to the second side surface portion (22). The first seal (31) is an elastic member. The part of the elastic member pressing against the first side surface portion (124) is the first seal part, and the part of the elastic member pressing against the second side surface portion (22) is the second seal part.

3. The switching valve according to claim 1, characterized in that, At least part of the first side surface portion (124) is opposite to the second side surface portion (22). The first seal (31) is a welding ring. The first side surface portion (124) and the second side surface portion (22) are connected through the welding ring. The first seal part is the part where the welding ring is welded to the first side surface portion (124), and the second seal part is the part where the welding ring is welded to the second side surface portion (22).

4. The switching valve according to any one of claims 1 to 3, characterized in that, The radial dimension of the valve seat passage (52a) is larger than the radial dimension of the valve body passage (52b); or The radial dimension of the valve seat passage (52a) is smaller than the radial dimension of the valve body passage (52b).

5. The switching valve according to any one of claims 1 to 3, characterized in that, The main valve assembly (10) further has a receiving groove (32), and at least part of the first seal (31) is located in the receiving groove (32). The receiving groove (32) is recessed in the direction away from the second side surface portion (22) of the first side surface portion (124). Alternatively, the receiving groove (32) is recessed in the direction away from the first side surface portion (124) of the second side surface portion (22). Alternatively, a part of the receiving groove (32) is recessed from the first side surface (124) away from the second side surface (22), and another part of the receiving groove (32) is recessed from the second side surface (22) away from the first side surface (124).

6. The switching valve according to claim 5, characterized in that, A chamfer (32a) is formed at the notch position of the receiving groove (32).

7. The switching valve according to claim 5, characterized in that Define the direction in which the first seal (31) contacts the first side surface (124) and the second side surface (22) as the first direction, and the direction perpendicular to the first direction as the second direction; The receiving groove (32) is a groove, and the groove is spaced apart from the first opening (124a) and the second opening (22a) in the second direction; or The receiving groove (32) is a stepped groove, and the stepped groove is connected to the first opening (124a) and the second opening (22a) in the second direction.

8. The switching valve according to any one of claims 1-3, characterized in that, The valve seat (2) has a first flow channel (52), and the valve seat channel (52a) communicates with the first flow channel (52); the switching valve includes a slider (11), the slider (11) is located in the receiving cavity (12), and the part of the valve seat (2) located in the receiving cavity (12) includes a third side surface (23), and the third side surface (23) is slidably matched with the slider (11); the slider (11) has a communication channel (111), and the communication channel (111) remains in communication with the first flow channel (52).

9. The switching valve according to any one of claims 1 to 3, characterized in that, The switching valve further includes a communication component (4), the communication component (4) includes a first communication flow channel (41), a second communication flow channel (42) and a fourth side surface (4a), a groove structure is formed on the fourth side surface (4a), and the groove structure serves as one of the first communication flow channel (41) and the second communication flow channel (42), and the other of the first communication flow channel (41) and the second communication flow channel (42) forms at least a fourth opening (41a) on the fourth side surface (4a); The fourth side surface (4a) is welded to the outer peripheral wall of the valve body (1); or A second seal is provided between the fourth side surface (4a) and the outer peripheral wall of the valve body (1), the second seal is disposed around the outside of the groove structure and / or around the outer periphery of the second opening (22a), and the second seal is an elastic member.

10. The switching valve according to any one of claims 1-3, characterized in that, The valve body (1) includes a cylindrical portion (1a) and a protruding portion (1b), along the radial direction of the cylindrical portion (1a), the protruding portion (1b) protrudes outward from the outer peripheral wall of the cylindrical portion (1a), the protruding portion (1b) encloses part of the receiving cavity (12), a part of the valve seat (2) is inserted into the protruding portion (1b), the first side surface (124) is a part of the inner side wall of the protruding portion (1b), and the second side surface (124) is the outer peripheral wall of the part of the valve seat (2) located in the receiving cavity (12).

11. The switching valve according to claim 8, wherein, The main valve assembly (10) includes a connecting pipe portion (13), the connecting pipe portion (13) and the valve body (1) are of a split structure, and the connecting pipe portion (13) is sealingly connected to the outer peripheral wall of the valve body (1); The accommodation cavity (12) includes a first sub-cavity (121), the slider (11) is located in the first sub-cavity (121), and the flow channel of the connecting pipe portion (13) communicates with the first sub-cavity (121); The first seal (31) fluidly separates the valve body channel (52b) from the first sub-cavity (121).

12. The switching valve according to claim 11, wherein The valve seat (2) further includes a second flow channel (51) and a third flow channel (53), and openings are formed in the third side surface portion (23) of the first flow channel (52), the second flow channel (51) and the third flow channel (53); When the slider (11) is in the first working position, the second flow channel (51) communicates with the first flow channel (52) through the communication channel (111), and the third flow channel (53) communicates with the first sub-cavity (121); When the slider (11) is in the second working position, the first flow channel (52) communicates with the third flow channel (53) through the communication channel (111), and the second flow channel (51) communicates with the first sub-cavity (121).

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