A method of manufacturing a check valve

Abstract

The application discloses a manufacturing method of a one-way valve. The valve body is prepared, the valve body has a first positioning part, the first positioning part comprises a first step surface, and the valve body further comprises a first end part; the valve cover is prepared, the valve cover has a second positioning part, the second positioning part comprises a second step surface, and the valve cover further comprises a second end part, the second end part comprises a protruding part, and the protruding part protrudes along the longitudinal direction of the valve cover; the support part is prepared, the support part comprises a blocking piece, the blocking piece comprises a fixing part, the fixing part comprises a first matching surface and a second matching surface; the first matching surface of the blocking piece is matched with the first positioning part of the valve body, the protruding part is opposite to the second matching surface, the valve cover is press-fitted with the valve body, and the first end part of the valve body is welded and fixed with the second end part of the valve cover. Therefore, the welding reliability of the valve body and the valve cover can be improved.

Description

Technical Field

[0001] This invention relates to the field of fluid control technology, and more specifically to a method for manufacturing a one-way valve. Background Technology

[0002] One-way valves are mainly used to control the forward and reverse flow of fluids. They are widely used in refrigeration systems to control the refrigerant in the system to flow in only a certain specified direction.

[0003] like Figure 1 The diagram shown is a schematic diagram of a one-way valve in the background art. Figure 2a As shown Figure 1 A structural diagram of the valve body as a component. Figure 2b As shown Figure 1 A structural diagram of the middle retaining ring when it is used as a component. Figure 2c As shown Figure 1 A structural diagram of the middle cover as a component.

[0004] like Figure 1 , Figure 2a , Figure 2b , Figure 2c As shown, the one-way valve includes a valve body 01, a cover 02, a retaining ring 03, a sliding rod 04, and a valve core component 05. The sliding rod 04 and the retaining ring 03 are riveted together to form a single unit. The edge of the retaining ring 03 is press-fitted between the valve body 01 and the cover 02. The valve body 01 and the cover 02 are welded together. The valve core component 05 can move axially relative to the sliding rod 04 along the valve body 01 to open or close the valve port 06. The end face of the valve body 01 that mates with the retaining ring 03 is a circular annular plane, and the end face of the cover 02 that mates with the retaining ring 03 is also a circular annular plane. The finished one-way valve requires that after the valve body 01 and the cover 02 are press-fitted together, there should be no gap between the valve body and the cover; otherwise, the welding quality of the welded positions at the end faces of the valve body 01 and the cover 02 will be affected. Furthermore, the size of the press-fit gap between the retaining ring 03 and the valve body 01 and the cover 02 directly affects the operational reliability of the valve core component 05. Therefore, the dimensional accuracy requirements for the inner step height L of valve body 01, the thickness T of retaining ring 03, and the outer step H of cover body 02 are all very high. Summary of the Invention

[0005] The purpose of this invention is to provide a method for manufacturing a one-way valve, comprising the following steps:

[0006] Manufacturing a valve body: The manufactured valve body has a first positioning part, the first positioning part includes a first stepped surface, and the valve body also includes a first end;

[0007] Manufacturing a valve cover: The manufactured valve cover has a second positioning part, the second positioning part includes a second stepped surface, and the valve cover also includes a second end, the second end includes a protrusion, the protrusion protruding along the longitudinal direction of the valve cover;

[0008] Fabrication of a support component: The support component includes a stop, the stop includes a fixing part, and the fixing part includes a first mating surface and a second mating surface;

[0009] The first mating surface of the stop is mated with the first positioning part of the valve body, so that the protrusion is opposite to the second mating surface. The valve cover is pressed onto the valve body, and the first end of the valve body is welded and fixed to the second end of the valve cover.

[0010] The manufacturing method of the one-way valve described above can improve the welding reliability of the valve body and valve cover. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of a one-way valve in the background art;

[0012] Figure 2a for Figure 1 A schematic diagram of the valve body in the diagram;

[0013] Figure 2b for Figure 1 A schematic diagram of the retaining ring structure in the middle;

[0014] Figure 2c for Figure 1 A schematic diagram of the valve body in the diagram;

[0015] Figure 3 This is a schematic diagram of the structure of the valve body and valve cover before welding, according to an embodiment of the one-way valve of the present invention.

[0016] Figure 4a Figure 4 shows a schematic diagram of the valve body structure.

[0017] Figure 4b This is a schematic diagram of the structure of the stop in Figure 4;

[0018] Figure 4c This is another structural schematic diagram of the stop in Figure 4;

[0019] Figure 5 for Figure 1 Schematic diagram of the middle valve cover;

[0020] Figure 5a for Figure 5 Cross-sectional view of the valve cover;

[0021] Figure 5b for Figure 5a A magnified view of a section at point I;

[0022] Figure 6 This is a schematic diagram of the valve cover of the one-way valve of the present invention in Example 2;

[0023] Figure 6a for Figure 6 A magnified view of a portion of I1. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The vertical orientation of this document refers to the appendix. Figure 1 , Figure 2c , Figure 3 , Figure 5a and Figure 6 The horizontal direction shown refers to the axial direction of the part when the corresponding part is cylindrical or has a circular hole.

[0025] Figure 3 This is a schematic diagram of the structure of the valve body and valve cover before welding, according to Embodiment 1 of the one-way valve of the present invention. It should be noted that the drawing is only one embodiment and is not a limitation on the assembly steps in the manufacturing method. Figure 3 As shown, the one-way valve in this embodiment includes a valve body 1, a valve seat 2 and a valve cover 3 fixedly connected to the valve body 1, and also includes a valve core component 4 and a support component 5. The valve seat 2 is connected to a first connecting pipe, and the valve cover 3 is connected to a second connecting pipe. The valve seat 2 includes a valve port 21 and a fluid inlet 22, and the valve cover 3 includes a fluid outlet 32. The valve core component 4 includes an annular sealing element 41 and a valve core body 42 with a guide hole 421. The sealing element 41 and the valve core body 42 are riveted and fixed. The support component 5 includes a positioning rod 51 and a stop 52. The positioning rod 51 and the stop 52 are riveted together or welded together. The one-way valve operates as follows: when the valve core component 4 abuts against the valve port 21, the fluid inlet 22 and the fluid outlet 32 ​​are not connected; when the valve core component 4 is separated from the valve port 21, the fluid inlet 22 and the fluid outlet 32 ​​are connected.

[0026] like Figure 3 As shown, the valve body 1, valve seat 2, valve cover 3, positioning rod 51, and stop 52 are made of stainless steel. Figure 4a , Figure 5 , Figure 5a and Figure 5b As shown, the structure of valve body 1 is similar to... Figure 2a The valve bodies shown have the same structure and are cylindrical. Valve body 1 includes a first positioning portion 13 and a first end portion 14. In this specific embodiment, the first positioning portion 13 is a first stepped portion formed on the inner wall of valve body 1. The first stepped portion includes a first stepped surface 131 and a first stepped wall 132, with the first stepped surface 131 facing the stop member 52. In the axial direction of valve body 1, the axial dimension of the first stepped portion 13 is L1, that is, the distance between the first stepped surface 131 and the end face of the first end portion 14 is L1. Figure 4b and 4cAs shown, the stop 52 is manufactured by stamping. The stop 52 includes an annular base 521 as shown by the dashed line M in Figure 4. The inner side of the base 521 is a receiving hole 522. One end of the positioning rod 521 passes through the receiving hole 522 and is riveted to the stop 52. The stop 52 also includes a plurality of legs 523 that extend radially from the outer edge of the base 521 and are spaced apart. In this embodiment, there are four legs 523, which are evenly distributed around the circumference of the base 521. Each leg 523 includes a fixing part 524 that abuts against the valve body 1 and the valve cover 3. Specifically, the fixing part 524 refers to the part that contacts the first step surface 131 on one side and the valve cover 523 on the other side. It should be noted that the specific shape of the stop 52 is not limited. The stop 52 can be a ring with or without a connector hole 522. When it does not have a connector hole 522, the positioning rod 51 can be welded to the stop 52. Alternatively, the positioning rod 51 and the stop 52 can be integrally formed from the same material. Furthermore, in the aforementioned stop with legs 523, the number of supports 523 is not limited; it can be two or three, etc.

[0027] like Figure 5 and Figure 5a , Figure 5b As shown, the valve cover 3 includes a second positioning portion 33 and a second end portion 34. The second positioning portion 33 is a second stepped portion formed on the outer wall of the valve cover 3. The second stepped portion includes a second stepped surface 331 and a second stepped wall 332. The second stepped surface 331 faces the valve body 1, and the first stepped wall 132 is located outside the second stepped wall 332. That is, the second stepped wall 332 of the valve cover 3 is located inside the valve body 1.

[0028] like Figure 4a , 4b 4c, 5a and Figure 5b As shown, when the valve cover 3 is used as a component, its second end 34 includes a protrusion 30. The protrusion 30 protrudes longitudinally along the valve cover 3 and is machined by turning, specifically by a CNC lathe. The amount of axial reduction in the size of the protrusion 30 along the valve body 1 before and after welding the valve cover 3 to the valve body 1 is defined as the deformation of the protrusion 30. The fixing part 524 of the stop 52 includes a first mating surface 5241 that mates with the first stepped surface 131 and a second mating surface 5242 that mates with the protrusion 30.

[0029] The protrusion 30 includes a root 301 and an abutment end 302. In the longitudinal direction of the valve cover 3, the cross-sectional area of ​​the abutment end 302 is smaller than the cross-sectional area of ​​the root 301, so that the protrusion has a shape that is smaller at one end and larger at the other in the longitudinal direction of the valve cover 3, making the protrusion 30 easy to be deformed by force compression.

[0030] The manufacturing process of the check valve with the above structure includes the following steps:

[0031] Preparation of valve body 1: A cylindrical valve body 1 is prepared using stainless steel material, and a first positioning part 13 is machined on the outer wall of the valve body;

[0032] Preparation of valve cover 3: Valve cover 3 is prepared using stainless steel material, and a second positioning part 33 is machined on the inner wall of valve cover 3;

[0033] Prepare support component 5;

[0034] a1: Assemble the first component A, which includes a valve body 1 and a valve seat 2. Weld the valve body 1 and the valve seat 2 together. Specifically, the valve body 1 and the valve seat 2 are fixed by laser welding.

[0035] a2: Install valve core component 4 into first component A;

[0036] a3: Install support component 5: Insert the positioning rod 51 part of the support component 5 into the guide hole 421 of the valve core body 42;

[0037] a4: Fixing the valve body 1 and valve cover 3: Position the first mating surface 5241 of the stop 52 with the first step surface 131 of the first positioning part 13 of the valve body 1. Then, extend the part of the valve cover 3 with the second step wall 332 into the valve body 1, so that the abutting end 302 of the protrusion 30 is opposite to the second mating surface 5242 of the stop 52. Then, press the valve cover 3 towards the valve body 1 using a tooling, so that the valve cover 3 presses the stop 52 and the valve body 1. During the pressing process, the protrusion 30 is squeezed and deformed until the second step surface 331 of the valve cover 3 is pressed against the end face of the first end 14 of the valve body 1. Then, laser weld the valve body 1 and the valve cover 3.

[0038] In the manufacturing method of the above-mentioned one-way valve, during the press-fitting process of valve body 1 and valve cover 3, the protrusion 30 is deformed. By controlling the amount of deformation of the protrusion 30, the stop 52 is clamped by valve body 1 and valve cover 3, which improves the fit between the first end 14 of valve body 1 and the second step surface 331 of valve cover 3, so that the fit position of valve body 1 and valve cover 3 at the first end 14 and the second step surface 331 can be laser welded.

[0039] In addition, after the valve body 1 and the valve cover 3 are pressed together, the protrusion 30 is used to press the stop 52, which can also effectively limit the circumferential rotation of the stop 52 relative to the valve body 1 to a certain extent. If the stop 52 rotates circumferentially relative to the valve body 1, it will increase the risk of rotational friction between the positioning rod 51 and the valve core 42, which is not conducive to the reliability of the valve core component 5.

[0040] Furthermore, after the valve body 1 and valve cover 3 are press-fitted, the protrusion 30 is used to press the stop 52, which can also limit the radial movement of the stop 52 relative to the valve body 1 to a certain extent, thereby driving the positioning rod 51 to move radially relative to the valve body 1, improving the operational reliability of the valve core component 5, and improving the reliability of the cooperation between the valve core component 5 and the valve port 21.

[0041] When the valve cover 3 is used as a component, its second end 34 includes a protrusion 30 and a flat portion 40. The protrusion 30 is a convex ring that protrudes from the flat portion 40 in a direction away from the second step surface 331. The protrusion 30 includes an annular pointed corner 31 near the end of the stop member 52. The end of the pointed corner 31 away from the valve body 1 is connected to the flat portion 40. In the longitudinal direction of the valve cover 3, the longitudinal section of the protrusion 30 is triangular. The angle θ of the pointed corner 31 is between 55° and 65°, and the height H1 of the protrusion 30 is between 0.15mm and 0.25mm. This makes it easier to control the deformation of the protrusion 30. During production, a life test can be conducted with the height of the protrusion 30 and the angle θ of the pointed corner at their minimum to confirm the reliability of the corner strength.

[0042] When the protrusion 30 is assembled, the end near the stop 52 is set as a sharp corner 31. When the valve cover 3 is pressed into the valve body 1, the protrusion 30 is easily deformed.

[0043] In the longitudinal direction of the valve cover 3, the cross-sectional area of ​​the protrusion 30 is smaller than the area of ​​the end face of the flat part 40, in order to further facilitate the extrusion deformation during the press-fitting process.

[0044] The structural shape of the protrusion 30 can be modified. For example, it can omit the sharp corner 31 and design the sharp corner 31 as an arc, or the longitudinal section of the protrusion 30 in the axial direction of the valve body 1 can be rectangular, etc.

[0045] Figure 6 The diagram shown is a structural schematic of another embodiment where the valve cover 3 is used as a component. Figure 6a for Figure 6 A magnified view of a portion of I1.

[0046] As shown in the figure, the valve cover 3A includes a second end portion 34A, which includes an annular groove portion 35A. A protrusion 30A extends from the bottom of the groove portion 35A, and the end of the protrusion 30A away from the bottom of the groove portion 35A is higher than the opening end face of the groove portion 35A, thereby improving the deformation of the protrusion 30A. Compared to Figure 5a The valve cover shown has the advantage of being able to more effectively control the deformation range of the protrusion after being squeezed, and the size of the end of the protrusion 30A located at the bottom of the groove can be made larger to improve its strength.

[0047] The above-described method for processing the check valve solves the technical problem of high precision requirements for the valve body, stop, and cover in the prior art check valve, making part processing easier and reducing manufacturing costs. Furthermore, during production, when the thickness T1 of the stop varies between batches, it also improves the welding reliability of the valve body 1 and valve cover 3, as well as the fixing reliability of the stop 52.

[0048] In the longitudinal direction of the valve cover 3, the dimension H1 of the second step portion is the distance between the second step surface 331 and the end face of the flat portion 40 of the second end 34.

[0049] Compared to the prior art, the technical solution of this application features a protrusion that improves the welding reliability of the valve body 1 and valve cover 3 and the fixing reliability of the stop 52 without changing the structure of other components. The height of the sharp corner is controlled at 0.2±0.05mm, and the angle at 60°±5°, making the sharp corner more susceptible to deformation under pressure.

[0050] The above is merely a description of specific embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for manufacturing a one-way valve, comprising the following steps: Manufacturing a valve body: The manufactured valve body has a first positioning part, the first positioning part includes a first stepped surface, and the valve body also includes a first end; Manufacturing a valve cover: The manufactured valve cover has a second positioning part, the second positioning part includes a second stepped surface, and the valve cover also includes a second end, the second end includes a protrusion, the protrusion protruding along the longitudinal direction of the valve cover; Fabrication of a support component: The support component includes a stop, the stop includes a fixing part, and the fixing part includes a first mating surface and a second mating surface; The first mating surface of the stop is mated with the first positioning part of the valve body, so that the protrusion is opposite to the second mating surface. The valve cover is pressed onto the valve body, so that the protrusion is squeezed and deformed. The first end of the valve body is welded and fixed to the second positioning part of the valve cover.

2. The method for manufacturing a one-way valve according to claim 1, characterized in that, The protrusion is annular and includes a root and an abutment end for abutting against the valve body. In the longitudinal direction of the valve cover, the cross-sectional area of ​​the abutment end is smaller than the cross-sectional area of ​​the root.

3. The method for manufacturing the one-way valve according to claim 2, characterized in that, When manufacturing the valve cover, a sharp corner is machined at the second end of the valve cover as the protrusion by a machining method. In the longitudinal direction of the valve cover, the longitudinal section of the sharp corner is triangular, and the angle θ of the sharp corner is between 55° and 65°.

4. The method for manufacturing a one-way valve according to claim 2, characterized in that, When the valve cover is manufactured, a flat portion and a sharp corner portion are formed at the second end of the valve cover by a machining method, and the height of the sharp corner portion is between 0.15mm and 0.25mm.

5. The method for manufacturing the one-way valve according to claim 1 or 2, characterized in that, When manufacturing the valve cover, an annular groove is machined at the second end, and the protrusion extends from the bottom of the groove, with the end of the protrusion away from the bottom of the groove protruding above the opening end face of the groove.

6. A method for manufacturing a one-way valve according to any one of claims 1-4, characterized in that, The valve body is made of stainless steel, the valve cover is made of stainless steel, and the valve body and the valve cover are welded and fixed by laser welding.

7. The method for manufacturing a one-way valve according to claim 5, characterized in that, The valve body is made of stainless steel, the valve cover is made of stainless steel, and the valve body and the valve cover are welded and fixed by laser welding.

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