Valve assembly of switching valve and switching valve

Abstract

The present application relates to a valve assembly of a switching valve and a switching valve. The valve assembly of the switching valve comprises a valve body (1) and a valve seat (2); a valve cavity (10) is formed inside the valve body (1); a pipe inlet hole (11) for mounting a gas inlet pipe and pipe connecting holes (12) for mounting connecting pipes are formed in the valve body (1); the pipe inlet hole (11) and the pipe connecting holes (12) are in communication with the valve cavity (10); there are at least two pipe connecting holes (12) which are arranged at intervals in the axial direction of the valve body (1); the valve seat (2) is located in the valve cavity (10), and the valve seat (2) is provided with valve seat holes (21) in communication with the pipe connecting holes (12) and the valve cavity (10) at positions corresponding to the pipe connecting holes (12); the valve body (1) is further provided with a through hole (13) for accommodating a brazing material; and the through hole (13) runs through the valve body (1) along the wall thickness direction of the valve body (1), such that the fitting surface between the valve body (1) and the valve seat (2) is completely filled and covered by the brazing material, thereby avoiding the occurrence of brazing skip, and thus improving the brazing quality and achieving a better fitting strength between the valve body (1) and the valve seat (2), that is, achieving a better fitting effect.

Description

Valve assembly of a switching valve and the switching valve

[0001] This application claims priority to the patent application with the application number 202421794737.0, the title of "Pilot valve assembly and switching valve having the same", filed on July 26, 2024, with the State Intellectual Property Office of China;

[0002] This application claims priority to the patent application with the application number 202422530280.9, the title of "Valve assembly of a switching valve and the switching valve", filed on October 18, 2024, with the State Intellectual Property Office of China. TECHNICAL FIELD

[0003] The present application relates to the technical field of reversing valves, in particular to a valve assembly of a switching valve and the switching valve. BACKGROUND

[0004] The existing reversing valves include three-way valves, four-way valves, etc., and usually include a valve body, a valve seat and a slider arranged in the inner cavity of the valve body. The valve body is provided with an inlet and a plurality of reversing interfaces, and the slider moves in the inner cavity of the valve body to realize the communication of the inlet and one of the reversing interfaces.

[0005] At present, the valve body and the valve seat are usually fixed by welding. After the solder is melted by heat, there are usually some areas between the valve body and the valve seat that cannot be completely filled and covered, resulting in the occurrence of broken welding, which affects the structural strength. SUMMARY

[0006] Therefore, it is necessary to provide a reversing valve to improve the bonding strength between the valve body and the valve seat.

[0007] To solve the above technical problems, the present application provides a valve assembly of a switching valve, which includes a valve body and a valve seat. The inside of the valve body forms a valve cavity. The valve body is provided with an inlet pipe hole for installing an inlet pipe and a connecting pipe hole for installing a connecting pipe. The inlet pipe hole and the connecting pipe hole are both in communication with the valve cavity. There are at least two connecting pipe holes, which are arranged at intervals along the axial direction of the valve body. The valve seat is located in the valve cavity, and the valve seat is provided with a valve seat hole at the position corresponding to the connecting pipe hole, which communicates the connecting pipe hole with the valve cavity. The valve body is provided with a through hole at the position corresponding to the valve seat for accommodating welding material. The through hole penetrates the valve body along the wall thickness direction of the valve body.

[0008] In an embodiment, the through hole is located between two adjacent connecting pipe holes. Certainly, the through hole and the connecting pipe hole are arranged on the same side.

[0009] It can be understood that the distance between the through hole and the two connecting holes is shortened, the welding material (such as a welding ring, a welding wire, a solder or a welding paste) in the through hole is melted by heat, and the first side wall of the valve seat and the bonding surface of the valve body are completely filled and covered by the welding material, so that the valve body and the valve seat are connected together, the generation of broken welding is prevented, and the welding quality is improved.

[0010] In an embodiment, the through hole is located at the middle of the two adjacent connecting holes.

[0011] It can be understood that the distance between the through hole and the two connecting holes is shortened, the welding material (such as a welding ring, a welding wire, a solder or a welding paste) in the through hole is melted by heat, and the first side wall of the valve seat and the bonding surface of the valve body are completely filled and covered by the welding material, so that the valve body and the valve seat are connected together, the generation of broken welding is prevented, and the welding quality is improved.

[0012] In an embodiment, a side wall of the valve seat facing the through hole is defined as a first side wall, and the through hole is isolated from the valve cavity through the first side wall.

[0013] In one of the embodiments, the first side wall is a complete wall surface corresponding to the through hole.

[0014] It can be understood that the melted welding material flows better into the valve body and the valve seat to fill the bonding surface therebetween, prevents broken welding, and improves the welding quality between the valve body and the valve seat.

[0015] In an embodiment, the connecting hole is coaxially arranged with the through hole.

[0016] In an embodiment, the axis of the through hole and the axis of each connecting hole are located on the same plane.

[0017] In an embodiment, the connecting hole has two, and the through hole and the connecting hole are the same in shape and size.

[0018] In an embodiment, the through hole is located beside at least two connecting holes. That is, one of the at least two connecting holes is located between the through hole and the other connecting hole.

[0019] In an embodiment, the through hole and the connecting hole are circular holes, and the diameter φA of the through hole and the diameter φB of the connecting hole satisfy: φA≤φB.

[0020] In an embodiment, the connecting hole is a circular hole, and the diameter φa of the connecting hole and the diameter φA of the through hole satisfy: φa<φA.

[0021] The application further provides a switching valve, comprising a valve assembly, wherein the valve assembly is the valve assembly of any one of the above embodiments, and a sliding member for switching the fluid flow direction is further arranged in the valve cavity, the side wall of the valve seat away from the through hole is defined as a second side wall, and the sliding member is arranged to move on the second side wall in the axial direction of the valve body; and the switching valve further comprises a pilot valve assembly arranged on the valve assembly.

[0022] Compared with the prior art, in the switching valve provided by the application, the through hole penetrating through the wall plate of the valve body is arranged on the valve body, the through hole is used for accommodating the welding material, the position for accommodating the welding material is additionally arranged, after the welding material is heated and melted, the welding material will flow into the valve body and the valve seat, so that the bonding surface between the valve body and the valve seat is more easily filled and covered by the welding material, the welding quality is improved, the bonding strength between the valve body and the valve seat is improved, that is, a better bonding effect is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0024] Fig. 1 is a perspective view of a switching valve according to an embodiment of the application;

[0025] Fig. 2 is a working principle diagram of the switching valve according to an embodiment of the application;

[0026] Fig. 3 is a structural schematic diagram of a valve body of the switching valve shown in Fig. 1;

[0027] Fig. 4 is a sectional view of the valve body shown in Fig. 3;

[0028] Fig. 5 is a perspective view of a valve seat of the switching valve shown in Fig. 1;

[0029] Fig. 6 is a sectional view of the valve seat shown in Fig. 5;

[0030] Fig. 7 is a structural schematic diagram of a switching valve according to an embodiment of the application;

[0031] Fig. 8 shows an enlarged view of A in Fig. 7;

[0032] Fig. 9 shows a sectional view of an exhaust pipe according to an embodiment of the application;

[0033] Fig. 10 shows a structural schematic diagram of part of a pilot valve body according to an embodiment of the application;

[0034] Figure 11 shows a cross-sectional view of a part of the pilot valve body according to an embodiment of the present application.

[0035] Reference signs: 1, valve body; 10, valve cavity; 11, inlet pipe hole; 12, connecting pipe hole; 13, through hole; 2, valve seat; 21, valve seat hole; 211, hole section; 22, first side wall; 221, wall surface; 23, second side wall; 3, sliding member; 4, connecting pipe; 50, pilot valve body; 51, first cavity; 52, exhaust port; 53, limiting protrusion; 14, pilot valve pipe; 15, valve core assembly; 16, coil; 20, first capillary tube; 26, first air inlet; 27, first air outlet; 28, second capillary tube; 24, third capillary tube; 25, fourth capillary tube; 30, exhaust pipe; 31, second air inlet; 32, second air outlet; 33, fixed end; 34, free end; 41, first inlet; 42, first outlet; 43, second outlet; 44, first piston cavity; 45, second piston cavity. DETAILED DESCRIPTION

[0036] The technical solutions in the at least one embodiment will be clearly and completely described with reference to the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The following description of the at least one embodiment is only illustrative, and is not as a limitation on the present application and its applications. Based on the embodiments in the present application, other embodiments obtained by a person of ordinary skill in the art without creative work are within the scope of protection of the present application.

[0037] Please refer to Figures 1-6. In order to avoid the case of incomplete welding material filling and covering the joint surface of the valve seat and the valve body, the present application provides a switching valve which can be used in an air conditioning system.

[0038] As shown in Figures 1 and 2, the switching valve includes a valve assembly and a sliding member 3. The valve assembly includes a valve body 1 and a valve seat 2. The valve body 1 has a valve cavity 10 defined inside, and the wall plate of the valve body 1 is provided with an inlet pipe hole 11 for installing an air inlet pipe and a connecting pipe hole 12 for installing a connecting pipe. The inlet pipe hole 11 and the connecting pipe hole 12 are both in communication with the valve cavity 10. The switching valve is a three-way valve, a four-way valve or a five-way valve, etc. Therefore, the connecting pipe hole 12 has at least two, and is arranged along the axial direction of the valve body 1. In the present application, a three-way valve is mainly taken as an example for detailed description. Therefore, the connecting pipe hole 12 has two.

[0039] As shown in Fig. 2, the valve seat 2 is located in the valve cavity 10, and the valve seat 2 is provided with a valve seat hole 21 corresponding to the pipe hole 12, which connects the pipe hole 12 and the valve cavity 10. The valve body 1 is provided with a through hole 13 for accommodating welding material at a position corresponding to the valve seat 2, and the through hole 13 penetrates the wall of the valve body 1 along the wall thickness direction of the valve body 1. The aforementioned through hole 13 is a solder hole, and is arranged on the same side as the pipe hole 12. The aforementioned welding material is a welding ring, a welding wire, a solder, or a solder paste, etc.

[0040] The through hole is provided to add a position for accommodating solder. After the solder is heated and melted, the solder flows between the valve body and the valve seat, so that the bonding surface between the valve body and the valve seat is more easily completely filled and covered by the solder, preventing the occurrence of broken welding, improving the welding quality, and making the bonding strength between the valve body and the valve seat better, i.e., achieving a better bonding effect.

[0041] As shown in Fig. 2, the side wall of the valve seat 2 facing the through hole 13 is defined as a first side wall 22, and the side wall of the valve seat 2 away from the through hole 13 is defined as a second side wall 23. The through hole 13 is isolated from the valve cavity 10 by the first side wall 22. The part of the first side wall 22 corresponding to the through hole 13 is a complete wall surface 221. The provision of the complete wall surface 221 makes the melted solder flow better between the valve body 1 and the valve seat 2 to fill therebetween, preventing broken welding and improving the welding quality between the valve body 1 and the valve seat 2. In addition, the part of the first side wall 22 corresponding to the through hole 13 can also be provided with a flow guide channel for facilitating the flow of solder.

[0042] In an embodiment, the through hole 13 is located between two adjacent pipe holes 12. In another embodiment, the through hole 13 is arranged beside the two pipe holes 12, i.e., one of the pipe holes 12 is located between the other pipe hole 12 and the through hole 13. In order to better avoid the occurrence of broken welding and make the valve seat 2 and the valve body 1 better connected together, the through hole 13 is located in the middle between the two adjacent pipe holes 12. Then, when the distance between the centers of the two pipe holes 12 is 2L, the distance between the center of the through hole 13 and the center of one of the pipe holes 12 is L. In this way, the two pipe holes 12 are equidistant from the through hole 13. After the solder in the through hole 13 is heated and melted, the melted solder flows in the direction of the two pipe holes 12, and the melted solder is uniformly distributed on both sides of the through hole 13, so that the bonding surface between the first side wall 22 of the valve seat 2 and the valve body 1 is completely filled and covered by the solder, the valve body 1 and the valve seat 2 are connected together, broken welding is prevented, and the welding quality is improved.

[0043] In an embodiment, the inlet hole 11 is arranged opposite to the through hole 13. As shown in Fig. 4, the inlet hole 11 is coaxially arranged with the through hole 13, and thus the center of the through hole 13 and the center of the inlet hole 11 are located on the same straight line. In another embodiment, the inlet hole 11 and the through hole 13 can be arranged in a circumferential manner along the valve body 1. In addition, the axis of the through hole 13 and the axis of each connecting hole 12 are located on the same plane.

[0044] In an embodiment, the inlet hole 11, the through hole 13 and the connecting hole 12 are all circular holes. The diameter φa of the inlet hole 11 and the diameter φA of the through hole 13 satisfy: φa < φA. Since the inlet hole 11 is arranged opposite to the through hole 13, the through hole 13 and the inlet hole 11 can be formed in sequence when a punch is used to punch the valve body 1, which facilitates the processing of the inlet hole 11 and the through hole 13.

[0045] As shown in Fig. 4, the diameter φA of the through hole 13 and the diameter φB of the connecting hole 12 satisfy: φA ≤ φB. In this way, the solder is prevented from gathering, and the welding quality is improved. In addition, the through hole 13 and the connecting hole 12 are not limited to circular holes, and other shapes can also be used.

[0046] As shown in Figs. 4 and 6, the valve seat hole 21 is also a circular hole, and the distance between the centers of the two valve seat holes 21 is equal to the distance between the centers of the two connecting holes 12, such as both being 2L.

[0047] As shown in Figs. 1, 2 and 6, the switching valve further includes a connecting pipe 4, and each connecting hole 12 corresponds to a connecting pipe 4, and thus the two connecting pipes 4 are arranged in a spaced manner along the axial direction of the valve body 1. The two connecting pipes 4 are connected to the corresponding connecting holes 12 in the same manner, and one of them will be described below. One end of the connecting pipe 4 penetrates through the corresponding connecting hole 12 and is inserted into the corresponding valve seat hole 21. In order to facilitate the connecting pipe 4 to be constrained in the corresponding valve seat hole 21, the valve seat hole 21 has a hole section 211 with a diameter equal to that of the corresponding connecting hole 12, and the connecting pipe 4 is constrained in the hole section 211.

[0048] In addition, the valve body of the present application can be used with a four-way valve, improving the versatility of the switching valve. At this time, the shape and size of the through hole 13 and the connecting hole 12 are the same, and the through hole 13 can be used as a connecting hole. In this design, the valve body can be standardized during production, reducing the preparation during production, and the valve body of the three-way valve and the four-way valve can be used, reducing the cost.

[0049] As shown in Figs. 2 and 6, the sliding member 3 is located in the valve cavity 10, and the sliding member 3 is arranged to move on the second side wall 23 along the axial direction of the valve body 1, thereby realizing the change of the flow direction of the fluid. The principle of realizing the reversing by the movement of the sliding member is the same as that in the prior art, and will not be described in detail in the present embodiment.

[0050] As shown in FIGS. 7-9, the switching valve further comprises a pilot valve assembly arranged on the valve assembly, the pilot valve assembly comprising a pilot valve body 50, a first capillary tube 20 and an exhaust pipe 30. The pilot valve body 50 has a first cavity 51 and an exhaust port 52 in communication with the first cavity 51. The first capillary tube 20 comprises a first inlet port 26 and a first outlet port 27, and the first inlet port 26 is in communication with the exhaust port 52. The exhaust pipe 30 is fixed to the outer side of the pilot valve body 50 and comprises a second inlet port 31 in communication with the first outlet port 27, and the exhaust pipe 30 is in communication with the first cavity 51 through the first capillary tube 20.

[0051] The pilot valve body 50 has the first cavity 51 and the exhaust port 52, the first inlet port 26 of the first capillary tube 20 is in communication with the exhaust port 52 of the pilot valve body 50, the exhaust pipe 30 is fixed to the outer side of the pilot valve body 50 and comprises the second inlet port 31 in communication with the first outlet port 27, and the exhaust pipe 30 is in communication with the first cavity 51 through the first capillary tube 20. Through the above arrangement, the first outlet port 27 is arranged on the exhaust pipe 30 instead of the pilot valve body 50, so that there is no need to process a capillary hole in the pilot valve body 50 for connecting and exhausting the first capillary tube 20, thereby simplifying the structure of the pilot valve assembly, avoiding the problem of processing difficulty caused by the oversize or complex structure of the pilot valve body 50, and saving the processing and maintenance costs.

[0052] As shown in FIGS. 7 and 9, the pilot valve body 50 has an end arranged in the axial direction and provided with a fixing portion, and the exhaust pipe 30 has a fixed end 33 and a free end 34 arranged oppositely, and the fixed end 33 is connected with the fixing portion. Through the above arrangement, the structure of the exhaust pipe 30 is simple and convenient for processing.

[0053] As shown in FIGS. 7-9, the exhaust pipe 30 further comprises a second outlet port 32 arranged on the free end 34, so that the second outlet port 32 is convenient for exhausting and can be welded with an external pipe at the free end 34 for connection according to the actual working condition. Arranging the second outlet port 32 at the free end 34 can also avoid interference with other components when the second outlet port 32 is exhausting. The second inlet port 31 is arranged on the side wall of the exhaust pipe 30. Through the above arrangement, the first outlet port 27 is in communication with the second inlet port 31, and the above structure is simple and convenient for processing the exhaust pipe 30.

[0054] As shown in FIGS. 9-11, the fixed part includes a limiting protrusion 53 annularly arranged on the end face of the pilot valve body 50, and the fixed end 33 is located in the annularly arranged limiting protrusion 53. In this way, the exhaust pipe 30 is connected with the pilot valve body 50 through the limiting protrusion 53 on the pilot valve body 50, the structure of the connecting part is simple, the structure of the pilot valve body 50 is further simplified, and the problems of machining difficulty or inconvenience of maintenance, high maintenance cost and the like caused by the complex structure of the pilot valve body 50 are avoided.

[0055] Further, an annular groove or a circular hole which is adapted to the structure of the fixed end 33 can be formed on the end face of the limiting protrusion 53, which facilitates the connection of the pilot valve body 50 and the exhaust pipe 30, and further improves the stability of the connection of the limiting protrusion 53 and the fixed end 33. Meanwhile, the above structure also facilitates the assembly and positioning of the fixed end 33 and the limiting protrusion 53, and improves the installation efficiency of the assembly. Moreover, the fixed end 33 is located in the limiting protrusion 53, and thus the limiting protrusion 53 can also limit and guide the position of the exhaust pipe 30, so as to avoid the shaking of the exhaust pipe 30 during work or when connecting the external pipe, and to affect the work or assembly precision.

[0056] Specifically, the limiting protrusion 53 can be integrally formed with the pilot valve body 50 through turning or other machining methods, and the above machining method is simple and very convenient to operate. Moreover, the integral forming of the limiting protrusion 53 and the pilot valve body 50 can also improve the structural strength of the pilot valve body 50 and the connecting part.

[0057] In other embodiments of the present application, different shaped grooves or holes can be machined on the end face of the limiting protrusion 53 according to the specific structure of the fixed end 33 of the exhaust pipe 30, as long as the fixed connection of the exhaust pipe 30 and the pilot valve body 50 can be realized.

[0058] In some embodiments of the present application, the exhaust pipe 30 can also be sleeved on the outer periphery of the limiting protrusion 53.

[0059] Further, as shown in FIGS. 7-9, the end face of the fixed end 33 abuts against the end part of the pilot valve body 50. Compared with the prior art in which one end of the first capillary tube penetrates through the limiting protrusion and an additional capillary tube hole needs to be additionally arranged on the limiting protrusion, the fixed end cannot abut against the end face of the pilot valve body. In the present application, the first air outlet 27 on the first capillary tube 20 is communicated with the second air inlet 31 on the exhaust pipe 30, so that the first capillary tube 20 is not arranged on the limiting protrusion 53, and the limiting protrusion 53 does not need to be additionally provided with a capillary tube hole, the first capillary tube 20 does not interfere with the fixed end 33, the end face of the fixed end 33 can abut against the end part of the pilot valve body 50, so that the connection strength of the exhaust pipe 30 and the limiting protrusion 53 is ensured, and meanwhile, the length of the limiting protrusion 53 along the axial direction of the pilot valve body 50 is reduced, the material is saved, and the manufacturing cost is saved.

[0060] As shown in FIG. 7 and FIG. 9, the exhaust pipe 30 has a flow channel passing through the fixed end 33 and the free end 34, and the second air inlet 31 and the second air outlet 32 are both communicated with the flow channel, which facilitates the processing of the exhaust pipe 30. The fixed end 33 is sealingly fixed with the pilot valve body 50, so that the fluid in the exhaust pipe 30 can be discharged from the second air outlet 32, avoiding leakage from the connection between the fixed end 33 and the limiting protrusion 53. A sealing ring can be arranged between the fixed end 33 and the limiting protrusion 53 to ensure the sealing.

[0061] As shown in FIG. 7, the extension direction of the exhaust pipe 30 is the same as that of the pilot valve body 50. If the extension direction of the exhaust pipe 30 has an angle with the extension direction of the pilot valve body 50, when the exhaust pipe 30 is relatively long, not only the space volume of the pilot valve assembly will be increased, but also the exhaust pipe 30 is prone to interfere with other components. Through the above arrangement, not only can the interference between the exhaust pipe 30 and other components during assembly and use be reduced, the flexibility of installation and disassembly and the convenience of operation of the exhaust pipe 30 and the pilot valve body 50 are improved, but also the structure size of the pilot valve assembly can be further reduced, facilitating processing and transportation.

[0062] The exhaust port 52 and the second air inlet 31 are located on the same side of the pilot valve body 50. If the second air inlet 31 and the exhaust port 52 are not on the same side, the extension direction of the first capillary tube 20 will have an angle with the extension direction of the pilot valve body 50, which will increase the space volume of the pilot valve assembly. Through the above arrangement, when the first capillary tube 20 communicates the exhaust pipe 30 and the pilot valve body 50, it only needs to be inserted into the second air inlet 31 after being bent by 180°, so that the extension direction of the first capillary tube 20 is still located in the same plane as the extension direction of the pilot valve body 50, which can further reduce the space volume of the pilot valve assembly, and also avoid the interference between the first capillary tube 20 and other components.

[0063] Alternatively, the exhaust pipe 30 and the pilot valve body 50 are welded, and the connection mode of the first capillary tube 20 and the exhaust pipe 30 is not limited, which can adopt fastening connection, interference fit and other connection modes. Or the first capillary tube 20 and the exhaust pipe 30 are welded, and the connection mode of the exhaust pipe 30 and the pilot valve body 50 is not limited, which can adopt tight fitting or fixed connection through fasteners. In this embodiment, the exhaust pipe 30 and the pilot valve body 50 are welded, and the first capillary tube 20 and the exhaust pipe 30 are welded. Through the above arrangement, the connection mode is simple, which improves the convenience of operation, facilitates the connection of the exhaust pipe 30, the pilot valve body 50 and the first capillary tube 20, and the welding connection makes the connection between the components more stable.

[0064] Specifically, the second air inlet 31 is located at the middle of the exhaust pipe 30. By the above arrangement, compared with the second air inlet 31 being located at the end of the exhaust pipe 30 close to the pilot valve body 50, the design of the present application can avoid the first capillary tube 20 being excessively bent, thereby reducing the fatigue damage or fracture of the first capillary tube 20. Compared with the second air inlet 31 being located at the end of the exhaust pipe 30 away from the pilot valve body 50, the design of the present application can reduce the length of the first capillary tube 20, and avoid the first capillary tube 20 being too close to the end of the exhaust pipe 30 away from the pilot valve body 50, which affects the connection of the exhaust pipe 30 and the external pipe.

[0065] In the embodiment of the present application, the outer periphery of the second air inlet 31 of the exhaust pipe 30 is annularly provided with a connecting protrusion for connecting with the first capillary tube 20. By the above arrangement, the connecting protrusion can increase the contact area of the second air inlet 31 and the first air outlet 27, further improving the stability of the connection of the first capillary tube 20 and the exhaust pipe 30.

[0066] Specifically, the first capillary tube located at one end of the first air outlet 27 can be located inside the connecting protrusion, or can be located outside the connecting protrusion.

[0067] The pilot valve body 50 includes a pilot valve pipe 14, a valve core assembly 15 and a coil 16. The pilot valve pipe 14 has a first cavity 51, an exhaust port 52 and two switching ports. The exhaust port 52 is located between the two switching ports. The valve core assembly 15 is located in the pilot valve pipe 14. The coil 16 is located at one end of the pilot valve pipe 14. The coil 16 is used to drive the valve core assembly 15 to move. The exhaust pipe 30 is located at the end of the pilot valve pipe 14 away from the coil 16. By the above arrangement, the position of the valve core assembly 15 is controlled by the coil 16, thereby controlling the exhaust port 52 to communicate with one of the switching ports, and the first cavity 51 to communicate with the other switching port. The exhaust pipe 30 is located at the end of the pilot valve pipe 14 away from the coil 16, which can further improve the rationality of the layout of the pilot valve assembly.

[0068] Specifically, the valve assembly has a first inlet 41, a first outlet 42 and a second outlet 43 arranged oppositely. The valve assembly further has a communication cavity. The valve assembly further includes a piston located in the communication cavity to divide the communication cavity into a first piston cavity 44, a valve cavity 10 and a second piston cavity 45. The first piston cavity 44 and the second piston cavity 45 are respectively located at two ends of the valve cavity 10. The first inlet 41, the first outlet 42 and the second outlet 43 all communicate with the valve cavity 10. The first inlet 41 is arranged at one side of the valve assembly. The first outlet 42 and the second outlet 43 are arranged at the other side of the valve assembly.

[0069] Further, the pilot valve assembly further comprises a second capillary tube 28 for connecting the first chamber 51 with the first inlet 41, a third capillary tube 24 for connecting the first piston chamber 44 with one switching port, and a fourth capillary tube 25 for connecting the second piston chamber 45 with another switching port. In this way, when the valve body is driven to reciprocate in the first chamber 51 by the coil 16 to drive the spool assembly 15, the piston can be driven to reciprocate in the communication chamber through the third capillary tube 24 and the fourth capillary tube 25, so as to switch the communication between the first inlet 41 and the first outlet 42 or the second outlet 43, to complete the switching and control of the flow path of the fluid in the switching valve.

[0070] The above only describes some embodiments of the present application and is not intended to limit the present application. Various modifications and changes can be made by those skilled in the art based on the spirit and principles of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A valve assembly of a switching valve, characterized by, The valve assembly comprises a valve body (1) and a valve seat (2), the inside of the valve body (1) forms a valve cavity (10), the valve body (1) is provided with an inlet hole (11) for installing an inlet pipe and a connecting hole (12) for installing a connecting pipe, the inlet hole (11) and the connecting hole (12) are communicated with the valve cavity (10), the connecting hole (12) is at least two and is arranged along the axial direction of the valve body (1), the valve seat (2) is located in the valve cavity (10), and the valve seat (2) is provided with a valve seat hole (21) corresponding to the connecting hole (12) and communicated with the connecting hole (12) and the valve cavity (10), the valve body (1) is provided with a through hole (13) for accommodating welding material at a position corresponding to the valve seat (2), and the through hole (13) penetrates the valve body (1) along the thickness direction of the wall of the valve body (1).

2. The valve assembly of claim 1, wherein, The through hole (13) is located between the two adjacent connecting holes (12); Or, the through hole (13) is located at the middle of the two adjacent connecting holes (12); Or, the through hole (13) is located on the side of the at least two connecting holes (12); The inlet hole (11) is coaxially arranged with the through hole (13); The axis of the through hole (13) and the axis of each connecting hole (12) are located on the same plane.

3. The valve assembly of claim 1, wherein, The side wall of the valve seat (2) facing the through hole (13) is defined as a first side wall (22), and the through hole (13) is isolated from the valve cavity (10) by the first side wall (22).

4. The valve assembly of claim 3, wherein, The part of the first side wall (22) corresponding to the through hole (13) is a complete wall surface (221).

5. The valve assembly of claim 1, wherein, The connecting hole (12) is two, the shape and size of the through hole (13) and the connecting hole (12) are the same.

6. The valve assembly of any one of claims 1-5, wherein, The through hole (13) and the connecting hole (12) are circular holes, and the diameter φA of the through hole (13) and the diameter φB of the connecting hole (12) satisfy: φA≤φB.

7. The valve assembly of claim 6, wherein, The inlet hole (11) is a circular hole, and the diameter φa of the inlet hole (11) and the diameter φA of the through hole (13) satisfy: φa<φA.

8. A switching valve comprising a valve assembly, characterized by The valve assembly is the valve assembly of any one of claims 1-7, the valve cavity (10) is further provided with a sliding piece (3) for switching the flow direction of the fluid, the side wall of the valve seat (2) away from the through hole (13) is defined as a second side wall (23), and the sliding piece (3) is arranged to move on the second side wall (23) along the axial direction of the valve body (1); the switching valve further comprises a pilot valve assembly arranged on the valve assembly.

9. The switching valve of claim 8, wherein The pilot valve assembly comprises: A pilot valve body (50) having a first cavity (51) and an exhaust port (52) communicated with the first cavity (51); A first capillary tube (20) comprising a first inlet port (26) and a first outlet port (27), the first inlet port (26) being communicated with the exhaust port (52); An exhaust pipe (30) is fixed outside the pilot valve body (50), the exhaust pipe (30) comprises a second inlet (31), the second inlet (31) is communicated with the first outlet (27), the exhaust pipe (30) is communicated with the first cavity (51) through the first capillary (20).

10. The switching valve of claim 9, wherein The end of the pilot valve body (50) in the axial direction is provided with a fixed part, the exhaust pipe (30) has an opposite fixed end (33) and a free end (34), the fixed end (33) is connected with the fixed part.

11. The switching valve of claim 10, wherein The exhaust pipe (30) further comprises a second outlet (32), the second outlet (32) is located at the free end (34), and the second inlet (31) is located on the side wall of the exhaust pipe (30).

12. The switching valve of claim 10, wherein The fixed part comprises a limiting protrusion (53), the limiting protrusion (53) is annularly arranged on the end face of the pilot valve body (50), and the fixed end (33) is located in the annularly arranged limiting protrusion (53); or, the fixed end (33) is sleeved outside the periphery of the annularly arranged limiting protrusion (53); the end face of the fixed end (33) abuts against the end of the pilot valve body (50).

13. The switching valve of claim 11, wherein The exhaust pipe (30) has a flow channel penetrating through the fixed end (33) and the free end (34), the second inlet (31) and the second outlet (32) are both communicated with the flow channel, and the fixed end (33) is sealingly fixed with the pilot valve body (50).

14. The switching valve of claim 9, the extension direction of the exhaust pipe (30) is the same as the extension direction of the pilot valve body (50).

15. The switching valve of claim 12, wherein The exhaust port (52) and the second inlet (31) are located on the same side of the pilot valve body (50).

16. The switching valve of claim 9, wherein The second inlet (31) is located in the middle of the exhaust pipe (30); an annular connecting protrusion is arranged on the periphery of the second inlet (31) of the exhaust pipe (30), and the connecting protrusion is used for connecting with the first capillary (20).

17. The switching valve of claim 9, wherein The pilot valve body (50) comprises a pilot valve pipe (14), a valve core assembly (15) and a coil (16), the pilot valve pipe (14) has the first cavity (51) and the exhaust port (52), the valve core assembly (15) is located in the pilot valve pipe (14), the coil (16) is located at one end of the pilot valve pipe (14), the coil (16) is used for driving the valve core assembly (15) to move, and the exhaust pipe (30) is located at the end of the pilot valve pipe (14) away from the coil (16).

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