Directional valve

Abstract

The present application provides a directional control valve, which includes a valve body, an end cover, and a welding groove for filling a welding material, the valve body is a tubular structure, the end of the valve body is a connecting end, the end cover includes a cover, a tapered tube, and a cylinder, one end of the tapered tube with a small outer diameter is connected to the cover, one end of the tapered tube with a large outer diameter is connected to the cylinder, the tapered tube and the cylinder are both inserted into the connecting end, and the outer wall of the tapered tube and the outer wall of the cylinder are both welded to the inner wall of the connecting end, the welding groove includes a first groove segment and a second groove segment that communicate with each other, the first groove segment is located between the outer wall of the tapered tube and the inner wall of the connecting end, and the second groove segment is located between the outer wall of the cylinder and the inner wall of the connecting end. The technical aspects provided by the present application can solve the problem of poor welding quality between the end cover and the inner wall of the valve body in the prior art.

Description

[Technical Field]

[0001] TECHNICAL FIELD This application relates to the technical field of valves, and more particularly to directional control valves. [Background technology]

[0002] In heat pump air conditioning systems, the four-way valve is an important component for switching the system between cooling and heating circulation modes. The four-way valve is primarily composed of a solenoid coil, a pilot valve, and a main valve. The main valve, working in conjunction with the solenoid coil and pilot valve, switches the direction of the refrigerant flow, enabling the air conditioning system to alternate between cooling and heating modes.

[0003] The main valve in a four-way valve is composed of a valve body, an end cover, a piston, etc., and both ends of the valve body are sealed by welding the end cover to the valve body. In the prior art, the end cover and the internal cavity of the valve body are in close contact with each other, and there is no gap between them, so the welding material generated during welding cannot penetrate into the contact area, resulting in poor welding quality between the end cover and the inner wall of the valve body and making the valve body more susceptible to leakage problems. Summary of the Invention

[0004] The present application provides a directional control valve for solving the problem of poor welding quality between the end cover and the inner wall of the valve body in the prior art.

[0005] To solve the above problems, the present application provides a directional control valve comprising a valve body, an end cover, and a welding groove for filling with welding material, wherein the valve body has a tubular structure, and one end of the valve body is a connecting end, the end cover comprises a cover, a tapered tube, and a cylinder, one end of the tapered tube with a smaller outer diameter is connected to the cover and one end of the tapered tube with a larger outer diameter is connected to the cylinder, the tapered tube and the cylinder both extend into the connecting end, and the outer walls of the tapered tube and the cylinder are welded to the inner wall of the connecting end, the welding groove comprises a first groove segment and a second groove segment that communicate with each other, the first groove segment is located between the outer wall of the tapered tube and the inner wall of the connecting end, and the second groove segment is located between the outer wall of the cylinder and the inner wall of the connecting end.

[0006] Furthermore, the first groove segment is located on the outer wall of the tapered barrel and / or the second groove segment is located on the outer wall of the cylinder.

[0007] Furthermore, the first groove segment extends along the generatrix of the outer surface of the tapered cylinder, and the second groove segment extends along the axis of the cylinder.

[0008] Furthermore, the length of the first groove segment is equal to or less than the length of the generatrix of the outer surface of the tapered cylinder.

[0009] Furthermore, the length of the second groove segment is equal to or less than the axial length of the cylinder.

[0010] Furthermore, the weld groove has a groove depth of 0.02 to 0.1 mm in a radial cross section.

[0011] Furthermore, the inner wall of the connecting end includes a cylindrical wall and a conical wall connected to each other, where the cylindrical wall is welded to the cylinder and the conical wall is welded to the tapered tube.

[0012] Furthermore, the first groove segment is located in the conical wall and the second groove segment is located in the cylindrical wall.

[0013] Furthermore, there are a plurality of weld grooves, and the plurality of weld grooves are distributed along the circumferential direction of the end cover.

[0014] Furthermore, the connection between the tapered tube and the outer wall of the end cover is chamfered, and the multiple welding grooves are formed by a knurled structure.

[0015] Furthermore, the size of the cover in the radial direction of the valve body is smaller than the size of the tapered tube, and the length of the connecting end in the axial direction of the valve body is greater than the total length of the tapered tube and the cylinder.

[0016] By applying the technical aspects of the present application, there is provided a directional control valve including a valve body, an end cover, and a welding groove for filling with welding material, wherein the valve body has a tubular structure, one end of the valve body is a connecting end, the end cover includes a cover, a tapered tube, and a cylinder, one end of the tapered tube with a smaller outer diameter is connected to the cover and one end of the tapered tube with a larger outer diameter is connected to the cylinder, the tapered tube and the cylinder both penetrate into the connecting end, and the outer walls of the tapered tube and the cylinder are both welded to the inner wall of the connecting end, the welding groove includes a first groove segment and a second groove segment that communicate with each other, the first groove segment is located between the outer wall of the tapered tube and the inner wall of the connecting end, and the second groove segment is located between the outer wall of the cylinder and the inner wall of the connecting end.

[0013] In this embodiment, first and second groove segments are provided between the outer wall of the tapered tube and the inner wall of the connecting end, and between the outer wall of the cylinder and the inner wall of the connecting end, and the first and second groove segments are connected to each other. This allows the welding material to more easily penetrate the first and second groove segments when welding the outer walls of the tapered tube and the cylinder to the inner wall of the connecting end. Furthermore, the welding material can be sufficiently filled in the weld groove, thereby avoiding the problem of the welding material being unable to penetrate due to close contact between the end cover and the valve body. Here, the tapered tube on the end cover allows the welding material to more easily flow into the first and second groove segments during welding, improving the welding quality and sealing effect between the end cover and the valve body and preventing leakage from the valve body. [Brief explanation of the drawings]

[0017] The drawings in the specification that form a part of this application are intended to provide a further understanding of the application, and the schematic examples and descriptions thereof are intended to aid in the interpretation of the application and are not intended to unduly limit the application.

[0018] [Figure 1] 1 shows a structural diagram of a directional control valve provided by an embodiment of the present application. [Figure 2] An enlarged view of a portion of FIG. 1 is shown. [Figure 3] FIG. 2 is a cross-sectional view of the end cover in FIG. [Figure 4] FIG. 4 shows a top view of the end cover in FIG. 3. [Figure 5] 1. FIG. 4 is a cross-sectional view of another structure of the end cover in FIG.

[0019] Here, the above drawings include the following reference numerals: 10 valve body, 11 connection end, 111 cylindrical wall, 112 conical wall, 20 end cover, 21 cover, 22 tapered cylinder, 23 cylinder, 30 welding groove, 31 first groove segment, 32 second groove segment. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, the technical aspects of the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. However, it is clear that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. The following description of at least one exemplary embodiment is merely explanatory in nature and does not impose any restrictions on the present application and its application or use. Based on the embodiments of the present application, all other embodiments that can be obtained by those skilled in the art without creative efforts shall fall within the scope of protection of the present application.

[0021] 1 to 5 , an embodiment of the present application provides a directional control valve including a valve element 10, an end cover 20, and a welding groove 30 for filling with welding material. The valve element 10 has a tubular structure, and an end of the valve element 10 is a connecting end 11. The end cover 20 includes a cover 21, a tapered tube 22, and a cylinder 23. The tapered tube 22 has an end with a smaller outer diameter connected to the cover 21 and an end with a larger outer diameter connected to the cylinder 23. The tapered tube 22 and the cylinder 23 both extend into the connecting end 11, and the outer walls of the tapered tube 22 and the cylinder 23 are welded to the inner walls of the connecting end 11. The welding groove 30 includes a first groove segment 31 and a second groove segment 32 that communicate with each other. The first groove segment 31 is located between the outer wall of the tapered tube 22 and the inner wall of the connecting end 11, and the second groove segment 32 is located between the outer wall of the cylinder 23 and the inner wall of the connecting end 11.

[0022] In this embodiment, the first groove segments 31 and the second groove segments 32 are provided between the outer wall of the tapered tube 22 and the inner wall of the connecting end 11, and between the outer wall of the cylinder 23 and the inner wall of the connecting end 11, and the first groove segments 31 and the second groove segments 32 are connected to each other. This allows the welding material to more easily penetrate the first groove segments 31 and the second groove segments 32 when welding the outer walls of the tapered tube 22 and the cylinder 23 to the inner wall of the connecting end 11. Furthermore, the welding material can be sufficiently filled in the weld groove 30, thereby avoiding the problem of the welding material being unable to penetrate due to close contact between the end cover 20 and the valve disc 10. The provision of the tapered tube 22 on the end cover 20 allows the welding material to more easily flow into the first groove segments 31 and the second groove segments 32 during welding, improving the welding quality and sealing effect between the end cover 20 and the valve disc 10 and preventing leakage from the valve disc 10.

[0023] Here, the first groove segment 31 may be provided only on the outer wall of the tapered tube 22 or the inner wall of the connecting end 11, or may be composed of a groove on the outer wall of the tapered tube 22 and a groove on the inner wall of the connecting end 11. The second groove segment 32 may be provided only on the outer wall of the cylinder 23 or the inner wall of the connecting end 11, or may be composed of a groove on the outer wall of the cylinder 23 and a groove on the inner wall of the connecting end 11.

[0024] In this embodiment, one end of the first groove segment 31 communicates with the outside of the directional control valve. This allows the welding material to flow smoothly into the first groove segment 31 and the second groove segment 32 when the end cover 20 and the valve body 10 are welded together, thereby improving the welding quality.

[0025] Alternatively, the cross section of the weld groove 30 may be rectangular, semicircular, or the like.

[0026] Specifically, the first groove segment 31 is located on the outer wall of the tapered tube 22, and the second groove segment 32 is located on the outer wall of the cylinder 23. By providing the first groove segment 31 on the outer wall of the tapered tube 22 and the second groove segment 32 on the outer wall of the cylinder 23, processing becomes easier and costs are reduced.

[0027] Specifically, the first groove segment 31 extends along the generatrix of the outer surface of the tapered tube 22, and the second groove segment 32 extends along the axis of the cylinder 23. By using the above configuration, the length of the welding groove 30 when the end cover 20 and the connecting end 11 are welded can be effectively increased, allowing more welding material to penetrate between the end cover 20 and the connecting end 11, improving the welding quality.

[0028] Furthermore, the length of the first groove segment 31 is equal to or shorter than the length of the generatrix of the outer surface of the tapered tube 22. In this embodiment, the length of the first groove segment 31 may be equal to or shorter than the length of the generatrix of the outer surface of the tapered tube 22. Either of the above configurations allows for smooth penetration of the welding material during welding, thereby ensuring the quality of the weld between the end cover 20 and the valve body 10.

[0029] Specifically, the length of the second groove segment 32 is equal to or shorter than the axial length of the cylinder 23. In this embodiment, the length of the second groove segment 32 may be equal to or shorter than the axial length of the cylinder 23. Either of the above configurations allows smooth penetration of the welding material during welding, thereby ensuring the quality of the weld between the end cover 20 and the valve body 10.

[0030] In this embodiment, the groove depth of the weld groove 30 in the radial cross section is 0.02 to 0.1 mm. By setting the groove depth of the weld groove 30 in the radial cross section within this range, it is possible to ensure the penetration amount of the welding material during welding, thereby satisfying the requirements for welding quality and also reducing costs.

[0031] As shown in Figures 2 to 5, the inner wall of the connecting end 11 includes a cylindrical wall 111 and a conical wall 112 connected to each other, where the cylindrical wall 111 is welded to the cylinder 23 and the conical wall 112 is welded to the tapered tube 22.

[0032] The first groove segment 31 is located in the conical wall 112, and the second groove segment 32 is located in the cylindrical wall 111. In this embodiment, the connecting end 11 and the end cover 20 are crimped and then welded, and the conical wall 112 is crimped and then formed. By providing the first groove segment 31 in the conical wall 112 and the second groove segment 32 in the cylindrical wall 111 and then welding them, the welding effect between the end cover 20 and the connecting end 11 can be improved and the welding quality can be ensured.

[0033] Here, the valve body 10 includes a main body and a connecting end 11. The connecting end 11 has a wall thickness smaller than that of the main body, and the cylinder 23 abuts against the main body. The connecting end 11 includes an outer circumferential surface and a limiting surface. The limiting surface is engaged with the end cover 20, so that when the end cover 20 and the connecting end 11 are assembled, the limiting surface can limit the insertion depth of the end cover 20. Some structures of the end cover 20 are located outside the valve body 10, and the end cover 20 seals the opening of the valve body 10.

[0034] Specifically, there are multiple weld grooves 30, and the multiple weld grooves 30 are distributed along the circumferential direction of the end cover 20. By providing multiple weld grooves 30, the distribution of the welding material can be made more uniform, which strengthens the weld strength between the end cover 20 and the valve body 10, improves the sealing performance between them, and prevents leakage.

[0035] Here, the connection points between the tapered tube 22 and the outer wall of the end cover 20 are chamfered, and the multiple weld grooves 30 are formed by a knurled structure. By providing chamfers at the connection points between the tapered tube 22 and the outer wall of the end cover 20, welding and assembly become easier. By providing a knurled structure, processing costs can be reduced.

[0036] In this embodiment, the dimension of the cover 21 in the radial direction of the valve body 10 is smaller than the dimension of the tapered tube 22, and the length of the connecting end 11 in the axial direction of the valve body 10 is greater than the combined length of the tapered tube 22 and the cylinder 23. Making the dimension of the cover 21 smaller than the dimension of the tapered tube 22 facilitates assembly of the end cover 20. Making the length of the connecting end 11 greater than the combined length of the tapered tube 22 and the cylinder 23 ensures an effective length for welding, improving welding quality.

[0037] 1, there are two end covers 20 and two connecting ends 11. Specifically, the directional control valve is a four-way valve.

[0038] The four-way valve is located in the refrigerant circuit formed by the indoor heat exchanger, the outdoor heat exchanger, etc., and usually consists of three parts: a solenoid coil, a main valve, and a pilot valve. End covers 20 are welded to both ends of the valve body 10 of the main valve, and a slider is located inside the valve body 10. The slider is connected to the left and right pistons by connecting rods, respectively, which divide the main valve chamber into a left chamber, a middle chamber, and a right chamber. The slider has a step on the top and is engaged with the connecting rods by the step. It has an internal cavity at the bottom. One set of connecting pipes passes through the internal cavity to form a closed fluid circulation, and another set of connecting pipes passes through the internal cavity of the valve body 10 to form another closed fluid circulation. The two sets of fluid circulation paths are separated from each other by the body of the slider. When the air conditioner needs to perform cooling, a pressure difference is created between the left and right chambers of the main valve under the action of the pilot valve. This pressure difference between the left and right chambers of the main valve causes the slider and two pistons to move, and the refrigerant in the system flows from the compressor's outlet to its inlet, putting the system into cooling operation. When the air conditioner needs to perform heating, a pressure difference is created between the left and right chambers of the main valve under the action of the pilot valve. This pressure difference causes the slider and two pistons to move in opposite directions, causing the refrigerant to flow to the compressor's inlet, putting the system into heating operation. Through the above process, the combined purpose of cooling in the summer and heating in the winter is achieved.

[0039] The above is only a preferred embodiment of the present application, and is not intended to limit the present application, and those skilled in the art can make various modifications and variations to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. The valve includes a valve body (10), an end cover (20), and a welding groove (30) for filling with welding material; The valve body (10) has a tubular structure, and an end of the valve body (10) is a connecting end (11); The end cover (20) includes a cover (21), a tapered tube (22), and a cylinder (23), one end of the tapered tube (22) having a smaller outer diameter is connected to the cover (21), one end of the tapered tube (22) having a larger outer diameter is connected to the cylinder (23), the tapered tube (22) and the cylinder (23) both penetrate into the connecting end (11), and the outer walls of the tapered tube (22) and the cylinder (23) are both welded to the inner wall of the connecting end (11). The welding groove (30) includes a first groove segment (31) and a second groove segment (32) that communicate with each other, the first groove segment (31) being located between the outer wall of the tapered tube (22) and the inner wall of the connecting end (11), and the second groove segment (32) being located between the outer wall of the cylinder (23) and the inner wall of the connecting end (11); A directional control valve, wherein the first groove segment (31) extends along a generatrix of the outer surface of the tapered tube (22), and the second groove segment (32) extends along an axis of the cylinder (23).

2. 2. The directional control valve according to claim 1, wherein the first groove segment (31) is located on the outer wall of the tapered tube (22) and / or the second groove segment (32) is located on the outer wall of the cylinder (23).

3. 2. The directional control valve according to claim 1, wherein a length of the first groove segment (31) is equal to or smaller than a length of a generatrix of the outer surface of the tapered barrel (22).

4. 2. The directional control valve according to claim 1, wherein the length of the second groove segment (32) is equal to or less than the axial length of the cylinder (23).

5. 2. The directional control valve according to claim 1, wherein the weld groove (30) has a groove depth in a radial cross section of 0.02 to 0.1 mm.

6. 2. The directional control valve according to claim 1, wherein the inner wall of the connecting end (11) includes a cylindrical wall (111) and a conical wall (112) connected to each other, wherein the cylindrical wall (111) is welded to the cylinder (23) and the conical wall (112) is welded to the tapered tube (22).

7. 7. The directional control valve according to claim 6, wherein the first groove segment (31) is located in the conical wall (112) and / or the second groove segment (32) is located in the cylindrical wall (111).

8. 2. The directional control valve according to claim 1, wherein there are a plurality of the welding grooves (30), and the plurality of welding grooves (30) are distributed along the circumferential direction of the end cover (20).

9. 9. The directional control valve according to claim 8, wherein a chamfer is formed at a connection portion of the outer wall of the tapered tube (22) and the end cover (20), and the plurality of welding grooves (30) are formed by a knurling structure.

10. 2. The directional control valve according to claim 1, wherein a dimension of the cover (21) in a radial direction of the valve body (10) is smaller than a dimension of the tapered tube (22), and a length of the connection end (11) in an axial direction of the valve body (10) is greater than a total length of the tapered tube (22) and the cylinder (23).

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