CN114719063A

CN114719063A - Manufacturing method of one-way valve

Info

Publication number: CN114719063A
Application number: CN202110627220.7A
Authority: CN
Inventors: 不公告发明人
Original assignee: Zhejiang Sanhua Climate and Appliance Controls Group Co Ltd
Current assignee: Zhejiang Sanhua Commercial Refrigeration Co ltd
Priority date: 2021-01-04
Filing date: 2021-06-04
Publication date: 2022-07-08

Abstract

The invention discloses a manufacturing method of a one-way valve, which comprises the following steps: preparing the valve body to have a first positioning part, wherein the first positioning part comprises a first step surface, and the valve body further comprises a first end part; preparing a valve cover: the prepared valve cover is provided with a second positioning part, the second positioning part comprises a second step surface, 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; preparing a supporting component: the supporting part comprises a stopper, the stopper comprises a fixing part, and the fixing part comprises a first matching surface and a second matching surface; and matching the first matching surface of the stopper with the first positioning part of the valve body, enabling the protrusion part to be opposite to the second matching surface, press-fitting the valve cover and the valve body, and welding and fixing the first end part of the valve body and the second end part of the valve cover. Thereby improving the welding reliability of the valve body and the valve cover.

Description

Manufacturing method of one-way valve

Technical Field

The invention relates to the technical field of fluid control, in particular to a manufacturing method of a one-way valve.

Background

The check valve is mainly used for controlling the forward and reverse flow of fluid, is widely applied to a refrigeration system, and is used for controlling the refrigerant in the system to flow only in a certain specified direction.

Fig. 1 is a schematic structural diagram of a check valve of the background art. Fig. 2a shows a schematic view of the valve body of fig. 1 as a component, fig. 2b shows a schematic view of the check ring of fig. 1 as a component, and fig. 2c shows a schematic view of the cap of fig. 1 as a component.

As shown in fig. 1, 2a, 2b, and 2c, the check valve includes a valve body 01, a cover 02, a retainer 03, a sliding rod 04, and a valve element 05, wherein the sliding rod 04 and the retainer 03 are riveted and fixed to form a whole, an edge of the retainer 03 is press-fitted between the valve body 01 and the cover 02, the valve body 01 and the cover 02 are welded and fixed, and the valve element 05 is axially movable along the valve body 01 relative to the sliding rod 04 to open or close the valve port 06. The end face of the valve body 01, which is matched with the retainer ring 03, is a circular plane, and the end face of the cover body 02, which is matched with the retainer ring 03, is also a circular plane. The finished product of the one-way valve requires that the valve body 01 and the cover body 02 are tightly pressed without clearance after being pressed, otherwise, the welding quality of the welding position of the end faces of the valve body 01 and the cover body 02 is influenced; in addition, the size of the press-fitting gap between the retainer ring 03 and the valve body 01 and the cover 02 directly affects the operational reliability of the valve element member 05. Therefore, the requirements for the dimensional accuracy of the inner step height L of the valve body 01, the thickness T of the retainer 03, and the outer step H of the cover 02 are all high.

Disclosure of Invention

The invention aims to provide a manufacturing method of a one-way valve, which comprises the following steps:

preparing a valve body: preparing the valve body to have a first positioning part, wherein the first positioning part comprises a first step surface, and the valve body further comprises a first end part;

preparing a valve cover: the prepared valve cover is provided with a second positioning part, the second positioning part comprises a second step surface, 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;

preparing a support component: the supporting part comprises a stopper, the stopper comprises a fixing part, and the fixing part comprises a first matching surface and a second matching surface;

and matching the first matching surface of the stopper with the first positioning part of the valve body, enabling the protrusion part to be opposite to the second matching surface, press-fitting the valve cover and the valve body, and welding and fixing the first end part of the valve body and the second end part of the valve cover.

The manufacturing method of the one-way valve can improve the welding reliability of the valve body and the valve cover.

Drawings

FIG. 1 is a schematic structural diagram of a check valve according to the background art;

FIG. 2a is a schematic structural view of the valve body of FIG. 1;

FIG. 2b is a schematic structural view of the retainer ring in FIG. 1;

FIG. 2c is a schematic structural view of the valve body of FIG. 1;

FIG. 3 is a schematic structural view of a check valve according to an embodiment of the present invention before welding the valve body and the valve cover;

FIG. 4a is a schematic structural view of the valve body in FIG. 4;

FIG. 4b is a schematic structural diagram of the stopper in FIG. 4;

FIG. 4c is a schematic view of another structure of the stopper in FIG. 4;

FIG. 5 is a schematic structural view of the valve cover of FIG. 1;

FIG. 5a is a cross-sectional view of the valve cover of FIG. 5;

FIG. 5b is an enlarged view of a portion of FIG. 5a at I;

FIG. 6 is a schematic structural view of a second example of a valve cover of the check valve of the present invention;

fig. 6a is an enlarged view of a portion of fig. 6 at I1.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments. The longitudinal direction in this context refers to the horizontal direction as shown in fig. 1, 2c, 3, 5a and 6, i.e. the axial direction of the parts when the corresponding parts are cylindrical or have circular holes.

Fig. 3 is a schematic structural diagram of a check valve according to an embodiment of the present invention before welding a valve body and a valve cover, and it should be noted that the drawing is only an embodiment and is not a limitation on an assembly step in a manufacturing method. As shown in fig. 3, the check valve of the present embodiment includes a valve body 1, a valve seat 2 fixedly connected to the valve body 1, and a valve cover 3, and further includes a valve core member 4 and a support member 5. The valve seat 2 is connected with a first connecting pipe, and the valve cover 3 is connected with 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 body member 4 includes an annular seal member 41 and a valve body 42 having a guide hole 421, and the seal member 41 is fixed to the valve body 42 by caulking. The support member 5 includes a positioning rod 51 and a stopper 52, and the positioning rod 51 and the stopper 52 are riveted or welded and fixed integrally. The working mode of the one-way valve is as follows: when the spool member 4 abuts the valve port 21, the fluid inlet 22 is not communicated with the fluid outlet 32, and when the spool member 4 is separated from the valve port 21, the fluid inlet 22 is communicated with the fluid outlet 32.

As shown in fig. 3, the valve body 1, the valve seat 2, the bonnet 3, the positioning rod 51, and the stopper 52 are made of a stainless steel material. As shown in fig. 4a, 5a and 5b, the valve body 1 has a cylindrical shape, similar to the valve body shown in fig. 2 a. The valve body 1 includes a first positioning portion 13 and a first end portion 14, in this embodiment, the first positioning portion 13 is a first step portion formed on an inner wall of the valve body 1, the first step portion includes a first step surface 131 and a first step wall 132, and the first step surface 131 faces the stopper 52. The axial dimension of the first step portion 13 in the axial direction of the valve body 1 is L1, that is, the distance between the first step surface 131 and the end surface of the first end portion 14 is L1. As shown in fig. 4b and 4c, the stopper 52 is formed by stamping, the stopper 52 includes an annular base 521 shown by a broken line M in fig. 4, a plug 522 is arranged inside the base 521, and one end of the positioning rod 521 passes through the plug 522 and is then riveted to the stopper 52. The stopper 52 further includes a plurality of spaced apart legs 523 extending radially from the outer edge of the base 521, in this embodiment, the number of the legs 523 is four, and the legs are uniformly distributed in the circumferential direction of the base 521. The leg 523 includes a fixing portion 524 that abuts against the valve body 1 and the bonnet 3, and specifically, the fixing portion 524 is a portion having one side contacting the first stepped surface 131 and the other side contacting the bonnet 523. Here, the specific shape of the stopper 52 is not limited, and the stopper 52 may be annular with or without the insertion hole 522, and when the insertion hole 522 is not provided, the positioning rod 51 may be welded and fixed to the stopper 52. Alternatively, the positioning rod 51 and the stopper 52 may be integrally formed of the same material. In the stopper with the leg 523, the number of the supports 523 is not limited, and may be 2 or 3.

As shown in fig. 5, 5a and 5b, the bonnet 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 bonnet 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 step wall 332 of the bonnet 3 is located inside the valve body 1.

As shown in fig. 4a, 4b, 4c, 5a and 5b, when the valve cap 3 is taken as a component, the second end portion 34 includes a protrusion 30, the protrusion 30 protrudes along the longitudinal direction of the valve cap 3, and the protrusion 30 is machined, specifically, by a numerically controlled lathe. The amount of size reduction of the boss 30 in the axial direction of the valve body 1 before and after welding of the bonnet 3 to the valve body 1 is defined as the amount of deformation of the boss 30. The fixing portion 524 of the stopper 52 includes a first mating surface 5241 that mates with the first step surface 131 and a second mating surface 5242 that mates with the protrusion 30.

The boss 30 includes a root 301 and an abutting end 302, and the cross-sectional area of the abutting end 302 is smaller than that of the root 301 in the longitudinal direction of the valve cap 3, so that the boss is shaped to be one small end and one large end in the longitudinal direction of the valve cap 3, and the boss 30 is easily deformed by being squeezed by force.

The check valve with the structure comprises the following steps during manufacturing:

preparing a valve body 1: preparing a cylindrical valve body 1 from a stainless steel material, and lathing a first positioning part 13 on the outer wall of the valve body;

preparing a valve cover 3: preparing the valve cover 3 from a stainless steel material, and lathing the second positioning part 33 on the inner wall of the valve cover 3;

preparing a support member 5;

a 1: the first subassembly A of equipment, first subassembly A include valve body 1 and disk seat 2, with valve body 1 and disk seat 2 welded fastening, specifically, pass through laser welding welded fastening with valve body 1 and disk seat 2.

a 2: installing the valve core component 4 into the first assembly A;

a 3: mounting the support member 5: the positioning rod 51 of the supporting component 5 partially extends into the guide hole 421 of the valve core body 42;

a 4: fixing the valve body 1 and the valve cover 3: the first mating surface 5241 of the stopper 52 is mated and positioned with the first stepped surface 131 of the first positioning portion 13 of the valve body 1, then the portion of the valve cover 3 on which the second stepped wall 332 is formed is extended into the valve body 1, so that the abutting end 302 of the boss 30 is opposite to the second mating surface 5242 of the stopper 52, then the valve cover 3 is press-fitted in the direction of the valve body 1 by a tool, so that the stopper 52 and the valve body 1 are pressed by the valve cover 3, the boss 30 is extruded and deformed during the pressing process until the second stepped surface 331 of the valve cover 3 is pressed against the end surface of the first end portion 14 of the valve body 1, and then the valve body 1 and the valve cover 3 are laser welded.

In the manufacturing method of the one-way valve, the bulge 30 is deformed in the press fitting process of the valve body 1 and the valve cover 3, the blocking piece 52 is ensured to be clamped by the valve body 1 and the valve cover 3 by controlling the deformation amount of the bulge 30, and the matching of the first end part 14 of the valve body 1 and the second step surface 331 of the valve cover 3 is improved, so that the valve body 1 and the valve cover 3 are subjected to laser welding at the matching position of the first end part 14 and the second step surface 331.

In addition, after the valve body 1 and the valve cover 3 are press-fitted, the stopper 52 is pressed through the arrangement of the protrusion 30, and the circumferential rotation of the stopper 52 relative to the valve body 1 can be effectively limited to a certain extent, and if the stopper 52 rotates in the circumferential direction relative to the valve body 1, the risk of the rotational friction between the positioning rod 51 and the valve core 42 is increased, which is not favorable for the operational reliability of the valve core component 5.

Moreover, after the valve body 1 and the valve cover 3 are pressed and mounted, the protrusion 30 is arranged to press the stopper 52, and the stopper 52 can be limited to move radially relative to the valve body 1 to drive the positioning rod 51 to move radially relative to the valve body 1, so that the action reliability of the valve core component 5 is improved, and the matching reliability of the valve core component 5 and the valve port 21 is improved.

When the valve cover 3 is a component, the second end portion 34 includes a flat portion 40 in addition to the protrusion portion 30, and the protrusion portion 30 is a convex ring protruding from the flat portion 40 in a direction away from the second step surface 331. The protrusion 30 includes an annular pointed portion 31 near one end of the stopper 52, one end of the pointed portion 31 remote from the valve body 1 is connected to the flat portion 40, and the longitudinal section of the protrusion 30 is triangular in the longitudinal direction of the bonnet 3. The angle theta of the sharp corner 31 is between 55 deg. and 65 deg., and the height H1 of the projection 30 is between 0.15mm and 0.25 mm. Thus, it is more convenient to control the amount of deformation of the boss 30. In production, a life test can be performed to confirm the reliability of the tip angle strength in a state where the height of the convex portion 30 and the tip angle θ are minimum.

The end of the boss 30 adjacent to the stopper 52 when assembled is provided as the pointed portion 31, and the boss 30 is easily deformed when the bonnet 3 is press-fitted to the valve body 1.

The cross-sectional area of the boss 30 is smaller than the area of the end face of the flat portion 40 in the longitudinal direction of the valve cover 3 in order to further facilitate the press-deformation during the press-fitting.

The configuration of the boss 30 may be modified, and for example, the sharp corner 31 may be omitted, the sharp corner 31 may be rounded, or the boss 30 may have a rectangular longitudinal section in the axial direction of the valve body 1.

Fig. 6 is a schematic structural view of a further embodiment with the valve cover 3 as a part, and fig. 6a is a partial enlarged view at I1 in fig. 6.

As shown in the figure, the valve cover 3A includes a second end portion 34A, the second end portion 34A includes an annular groove portion 35A, the protrusion portion 30A protrudes from a bottom of the groove portion 35A, and an end of the protrusion portion 30A remote from the bottom of the groove is higher than an opening end surface of the groove portion 35A, thereby improving a deformation amount of the protrusion portion 30A. The advantage of this valve cover over the valve cover shown in fig. 5a is that the extent of deformation of the protrusion after compression can be more effectively controlled and the end of the protrusion 30A at the base of the groove can be made larger for better strength.

The processing method of the check valve solves the technical problem that the check valve in the background art has high requirements on the processing precision of the valve body, the stopper and the cover body, so that parts are easy to process, and the manufacturing cost of the parts is reduced. In addition, in the production process, when the thickness dimension T1 of each batch of the stoppers is inconsistent, the welding reliability of the valve body 1 and the valve cover 3 and the fixing reliability of the stoppers 52 can be improved.

The dimension H1 of the second stepped portion is the distance between the second stepped surface 331 and the end surface of the flat surface portion 40 of the second end portion 34 in the longitudinal direction of the valve cover 3.

Compared with the background art, the technical scheme of the application has the advantages that the bulge is arranged, the welding reliability of the valve body 1 and the valve cover 3 and the fixing reliability of the stopper 52 can be improved without changing the structures of other parts. The height of the sharp corner part is controlled to be 0.2 +/-0.05 mm, and the angle of the sharp corner is controlled to be 60 +/-5 degrees, so that the sharp corner part is more easily deformed under pressure.

The foregoing is merely an illustration of specific embodiments of this invention and it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and are intended to be within the scope of the invention.

Claims

1. A method of manufacturing a one-way valve comprising the steps of:

preparing a supporting component: the supporting part comprises a stopper, the stopper comprises a fixing part, and the fixing part comprises a first matching surface and a second matching surface;

2. The manufacturing method of a check valve as claimed in claim 1, wherein the boss portion has a ring shape, the boss portion includes a root portion and an abutting end for abutting with the valve body, and an area of a cross section of the abutting end is smaller than an area of a cross section of the root portion in a longitudinal direction of the bonnet.

3. The manufacturing method of a check valve as claimed in claim 2, wherein a sharp corner portion having a triangular longitudinal section is machined as the protrusion at the second end portion of the valve cover by a turning method in manufacturing the valve cover, and an angle θ of a sharp corner of the sharp corner portion is between 55 ° and 65 ° in a longitudinal direction of the valve cover.

4. The manufacturing method of the check valve as claimed in claim 2, wherein the valve cover is manufactured by forming a flat portion and a sharp corner portion at the second end portion of the valve cover by a lathing method, and the height of the sharp corner portion is between 0.15mm and 0.25 mm.

5. The manufacturing method of a check valve according to claim 1 or 2, wherein the valve cover is manufactured by forming a groove portion having a ring shape at the second end portion, the protrusion portion protrudes from a bottom of the groove portion, and an end of the protrusion portion remote from the bottom of the groove portion is higher than an opening end surface of the groove portion.

6. The manufacturing method of a check valve according to any one of claims 1 to 4, wherein the valve body is made of a stainless steel material, the valve cover is made of a stainless steel material, and the valve body and the valve cover are welded and fixed by a laser welding method.

7. The manufacturing method of a check valve as claimed in claim 5, wherein the valve body is made of a stainless steel material, the valve cover is made of a stainless steel material, and the valve body and the valve cover are welded and fixed by a laser welding method.