Electromagnetic valve

Abstract

The invention provides an electromagnetic valve which comprises a valve body, a valve seat and a first connecting pipe, the valve body is fixedly connected with the valve seat, the valve seat is made of metal materials in a stamping mode, the valve seat comprises an upper section and a lower section, the upper section comprises a top, an upper cylinder part and a connecting part connecting the top and the upper cylinder part, the top is in a circular-ring-shaped flat plate shape, and the lower section is in a circular-ring-shaped flat plate shape. The top part is provided with a valve port part, the lower section comprises a lower cylinder part, the inner diameter of the lower cylinder part is larger than that of the upper cylinder part, the first connecting pipe is partially located in an inner cavity of the valve seat, the lower cylinder part is fixedly connected with the first connecting pipe, the lower surface of the top part is a flat plate surface, the outer diameter of the flat plate surface is defined as D, the inner diameter of the upper cylinder part is T, the minimum inner diameter of the first connecting pipe is P, and T > D > = P. According to the electromagnetic valve, the stress area of the top of the valve seat can be guaranteed, and therefore the valve port part can be extruded conveniently.

Description

[0001] This application claims priority to the following Chinese patent application, the entire contents of which are incorporated herein by reference: Application number: 202311027567.3, Application date: August 14, 2023, Applicant: Zhejiang Sanhua Commercial Refrigeration Co., Ltd., Invention name: A solenoid valve. Technical Field

[0002] The present invention relates to the technical field of fluid control, and in particular to a solenoid valve. Background Art

[0003] Solenoid valve products are widely used. Figure 1 The following is a schematic diagram of the structure of a solenoid valve in the background technology. Figure 1 As shown, the solenoid valve includes a valve body 01, a sleeve 02, a first connecting pipe 03, and a second connecting pipe 04. The valve body 01 includes a valve mouth portion 011, and the valve mouth portion 011 is formed by extrusion. In the specific production process, in order to avoid the thermal influence of welding on the valve mouth portion 011, the valve body 01, the sleeve 02, the first connecting pipe 03, and the second connecting pipe 04 are often extruded and shaped after the valve body 01, the sleeve 02, the first connecting pipe 03, and the second connecting pipe 04 are welded into one. In view of this, how to conveniently extrude the valve mouth portion provides a subject for improvement for those skilled in the art. Summary of the invention

[0004] The solenoid valve provided by the present invention includes a valve body, a valve seat and a first connecting pipe, the valve body is fixedly connected to the valve seat, the valve seat is made of stamping metal material, the valve seat includes an upper section and a lower section, the upper section includes a top, an upper cylindrical portion and a connecting portion connecting the top and the upper cylindrical portion, the top is in the shape of a circular ring-shaped flat plate, the top has a valve mouth portion, the lower section includes a lower cylindrical portion, the inner diameter of the lower cylindrical portion is greater than the inner diameter of the upper cylindrical portion, the first connecting pipe portion is located in the inner cavity of the valve seat, the lower cylindrical portion is fixedly connected to the first connecting pipe, the lower surface of the top is a flat surface, the outer diameter of the flat surface is defined as D, the inner diameter of the upper cylindrical portion is T, the minimum inner diameter of the first connecting pipe is P, then it satisfies: T>D≥P.

[0005] The solenoid valve provided in the present application can ensure the force-bearing area of ​​the top of the valve seat, thereby facilitating squeezing of the valve mouth. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 : Background technology A schematic diagram of the structure of a solenoid valve;

[0007] Figure 2 : The present invention provides a structural schematic diagram of a solenoid valve;

[0008] Figure 3 : Figure 2 A local enlarged schematic diagram of point I in the middle;

[0009] Figure 4 : Figure 2 Schematic diagram of the structure of the middle valve seat;

[0010] Figure 5 : Schematic diagram of tooling when the valve mouth is squeezed;

[0011] Figure 6 : The present invention provides a schematic diagram of the structure of another solenoid valve.

[0012] Figure 2-Figure 6 Explanation of symbols:

[0013] 1-valve body, 10-inner cavity of valve body, 11-side hole;

[0014] 2-valve seat, 20-inner cavity of the valve seat;

[0015] 21-upper section, 211-top;

[0016] 2111-extrusion hole section, 2112-straight hole section;

[0017] 2113- flat surface;

[0018] 210-valve port, 2100-valve port;

[0019] 212- curved portion, 213- upper cylindrical portion;

[0020] 214-connecting part, 22-lower section;

[0021] 221-lower cylindrical portion, 222-bending portion;

[0022] 3-first connecting pipe, 31-first matching part;

[0023] 4 / 4A-second connecting pipe, 41-second matching portion, 42A-external convex portion;

[0024] 5-moving iron core component, 51-moving iron core;

[0025] 52-valve core, 6-head;

[0026] 7-gasket, 70-mounting hole;

[0027] 8- extrusion part, 9- mandrel;

[0028] L-center axis, Q-annular accommodating cavity. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. Figure 2 The positions of the components shown in the figure are defined only for the clarity and convenience of expressing the technical solution. It should be understood that the directional words used in this article should not limit the scope of protection requested by this application.

[0030] Figure 2 A structural schematic diagram of a solenoid valve is provided for the present invention; Figure 3 for Figure 2 A local enlarged schematic diagram of point I in the middle; Figure 4 for Figure 2 Schematic diagram of the structure of the middle valve seat; Figure 5 This is a schematic diagram of the tooling during valve mouth extrusion.

[0031] like Figure 2 As shown, the solenoid valve comprises a valve body 1, a valve seat 2 and a first connecting pipe 3. The valve body 1 is made of a stainless steel tube and is cylindrical. The valve seat 2 is made of a metal sheet by stamping and is roughly cylindrical. The valve seat 2 is located in the inner cavity 10 of the valve body 1.

[0032] Specifically, Figure 2 , Figure 3 As shown, the valve seat 2 includes an upper section 21 and a lower section 22. The upper section 21 includes a top 211, an upper cylindrical portion 213 and a connecting portion 214, wherein the connecting portion 214 connects the top 211 and the upper cylindrical portion 213, and the top 211 is in the shape of an annular flat plate, that is, the top 211 is arranged to extend radially along the valve body 1, and the top 211 has a valve mouth portion 210. The lower section 22 includes a lower cylindrical portion 221, wherein the inner diameter of the lower cylindrical portion 221 is greater than the inner diameter of the upper cylindrical portion 213, and the first connecting pipe 3 is partially located in the inner cavity 20 of the valve seat 2, and the lower cylindrical portion 221 is fixedly connected to the first connecting pipe 3. The lower surface of the top 211 is a flat surface 2113, and the outer diameter of the flat surface 2113 is defined as D, the inner diameter of the upper cylindrical portion 213 is defined as T, and the minimum inner diameter of the first connecting pipe 3 is defined as P, then the following is satisfied: T>D≥P. With such a configuration, as Figure 5 As shown, during the extrusion process of the valve mouth portion 210, the core rod 9 passes through the first connecting pipe 3 to support the top 211, which facilitates the extrusion of the valve mouth portion 210 by the extrusion piece 8, and the outer diameter of the core rod 9 can be close to the minimum inner diameter of the first connecting pipe 3, ensuring the force-bearing area of ​​the top 211 and improving the convenience of the extrusion process.

[0033] Further, the solenoid valve further comprises a moving iron core component 5 and a sealing head 6, the upper section of the valve body 1 is fixedly connected to the sealing head, and the lower section of the valve body 1 is fixedly connected to the valve seat 2. The moving iron core component 5 is located in the inner cavity 10 of the valve body 1, and the moving iron core component 5 comprises a moving iron core 51 and a valve core 52, the moving iron core 51 and the valve core 52 are limitedly connected, the moving iron core 51 can move along the axial direction of the valve body 1 with the valve core 52, and the valve core 52 can abut the valve port 210. The valve port 210 comprises a valve port 2100, and the inner diameter of the valve port 2100 is defined as d, which satisfies: 2.5≥D / d≥2. When D / d is less than 2, that is, when the inner diameter d of the valve port 2100 is constant, the outer diameter D of the flat surface 2113 of the top 211 is too small, which will result in a smaller support surface area of ​​the top 211, making it difficult to extrude and process the valve port 210; when D / d is greater than 2.5, that is, when the inner diameter d of the valve port 2100 is constant, the outer diameter D of the flat surface 2113 is too large, which will result in a decrease in the impact resistance of the top 211. Under repeated impacts of the valve core 51, the top 211 will collapse downward, affecting the service life of the solenoid valve. That is, the convenience of extruding the valve port can be improved, while the impact resistance of the top can be taken into account.

[0034] In this embodiment, the valve core 52 is a steel ball, and the valve mouth portion 210 includes an extruded hole section 2111 and a straight hole section 2112. The extruded hole section 2111 is formed by extrusion, and the valve core 52 can be offset against the extruded hole section 2111. The inner diameter of the extruded hole section 2111 gradually decreases downward along the axial direction of the valve body 1, and the straight hole section 2112 includes the above-mentioned valve mouth 2100.

[0035] Furthermore, the upper section 21 includes a curved portion 212, and the curved portion 212 connects the upper cylindrical portion 213 and the lower section 22. The upper end of the first connecting pipe 3 contacts the curved portion 212, and the first connecting pipe 3 is welded and fixed to the lower cylindrical portion 221. In this way, the curved portion 212 can position the first connecting pipe 3 in the axial direction of the valve body 1, which is convenient for welding.

[0036] As a specific solution, the first connecting pipe 3 includes a first matching portion 31, and the axial positioning of the first connecting pipe 3 is achieved by the upper end of the first matching portion 31 contacting the bent portion 212. The first matching portion 31 is specifically formed by wire drawing or knurling. Since the inner diameter of the first matching portion 31 is slightly reduced after wire drawing or knurling, the minimum inner diameter P of the first connecting pipe 3 is located at the first matching portion 31. Such a configuration is conducive to solder flow and improves welding quality.

[0037] In this embodiment, the lower section 22 further includes a bent portion 222, which is formed by bending outward from the lower end of the lower cylindrical portion 221 along the radial direction of the valve seat 2, and the bent portion 222 is higher than the lower end of the valve body 1, and the bent portion 222 is welded and fixed to the valve body 1. In this way, the valve body 1, the valve seat 2 and the first connecting pipe 3 form an annular accommodating chamber Q, and the accommodating chamber Q is used to place the welding ring.

[0038] As a specific implementation method, Figure 3 As shown in Figure 4, the matching length between the first matching portion 31 and the lower cylindrical portion 221 is defined as A1, which satisfies: A1>1.5mm, and the thickness of the top portion 211 is defined as A2, which satisfies: A2>0.5mm. This arrangement can ensure the impact resistance of the valve seat 2.

[0039] Further, such as Figure 2 As shown in Figure 3, the solenoid valve of this embodiment further includes a second connecting pipe 4, which includes a second matching portion 41. The second matching portion 41 is formed by wire drawing or knurling. The second matching portion 41 penetrates the side hole 11 of the valve body 1. In the radial direction of the valve body 1, the second matching portion 41 contacts the upper cylindrical portion 213 to achieve the positioning of the second connecting pipe 4. In the axial direction of the valve body 1, the top 211 of the valve seat 2 is flush with the central axis L1 of the second matching portion 41. The central axis L1 of the second matching portion 41 can extend through the top 211, that is, in the height direction of the solenoid valve, the upper limit of the central axis L1 of the second matching portion 41 is not higher than the upper surface of the top 211, and the lower limit is not lower than the lower surface of the top 211. By limiting the relative position of the valve seat 2 and the second connecting pipe 4 in the axial direction of the valve body 1, a beneficial effect is that if the position of the second connecting pipe 4 relative to the valve seat 2 is too high, the length of the moving iron core 51 will be lengthened. The moving iron core 51 is made of soft magnetic material, which is expensive, and lengthening it will increase the material cost; if the position of the second connecting pipe 4 relative to the valve seat 2 is too low, the valve seat 2 will block the fluid flowing in from the second connecting pipe 4, affecting the flow rate of the solenoid valve.

[0040] Further, such as Figure 3 As shown, the solenoid valve further includes a metal gasket 7, the thickness of which is greater than the thickness of the valve body 1. The gasket 7 includes a mounting hole 70, the second matching portion 41 matches with the hole wall of the side hole 11 and the hole wall of the mounting hole 70, and the second connecting pipe 4, the valve body 1 and the gasket 7 are welded and fixed. By providing the gasket 7, the welding matching surface is lengthened, and the welding quality of the second connecting pipe 4 and the valve body 1 can be improved.

[0041] In this embodiment, Figure 4 As shown, along the axial direction of the valve seat 2, the height of the upper section 21 is defined as H1, and the height of the lower section 22 is defined as H2, then: H1≤2H2. ​​Since the valve seat 2 is mainly welded to the valve body 1 and the first connecting pipe 3 through the lower section 22, and the valve seat 2 is made by stamping a metal sheet, if the height H1 of the upper section 21 exceeds 2 times H2, the axial elongation rate of the valve seat 2 increases, and since the top 211 of the valve seat 2 needs to withstand repeated impacts of the valve core 52, a low-profile valve seat is more impact-resistant and can improve its reliability.

[0042] Figure 6 A structural schematic diagram of another solenoid valve is provided for the present invention.

[0043] The difference between this embodiment and the above-mentioned embodiment lies in the structure of the second connecting pipe.

[0044] Specifically, Figure 6 As shown, the second connecting pipe 4A passes through the side hole 11 of the valve body 1, and the second connecting pipe 4A includes an outer convex portion 41A. The outer convex portion 41A is in a circular ring shape, and its outer diameter is larger than the hole diameter of the side hole 11. Along the radial direction of the valve body 1, the outer convex portion 41A contacts the valve body 1, and the second connecting pipe 4A is positioned along the radial direction of the valve body 1.

[0045] Along the axial direction of the valve body 1, the top 211 of the valve seat 2 is flush with the central axis L2 of the second connecting pipe 4A. The central axis L2 of the second connecting pipe 4A can extend through the top 211, that is, in the height direction of the solenoid valve, the upper limit of the central axis L2 of the second connecting pipe 4A is not higher than the upper surface of the top 211, and the lower limit is not lower than the lower surface of the top 211. By limiting the relative position of the valve seat 2 and the second connecting pipe 4A in the axial direction of the valve body 1, the beneficial effects are the same as those of the above embodiment, and will not be repeated here.

[0046] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A solenoid valve, characterized in that: It includes a valve body, a valve seat and a first connecting pipe, the valve body is fixedly connected to the valve seat, the valve seat is made of stamping metal material, the valve seat includes an upper section and a lower section, the upper section includes a top, an upper cylindrical portion and a connecting portion connecting the top and the upper cylindrical portion, the top is in the shape of a circular ring-shaped flat plate, the top has a valve mouth portion, the lower section includes a lower cylindrical portion, the inner diameter of the lower cylindrical portion is greater than the inner diameter of the upper cylindrical portion, the first connecting pipe portion is located in the inner cavity of the valve seat, the lower cylindrical portion is fixedly connected to the first connecting pipe, the lower surface of the top is a flat surface, the outer diameter of the flat surface is defined as D, the inner diameter of the upper cylindrical portion is T, the minimum inner diameter of the first connecting pipe is P, then it satisfies: T>D≥P.

2. The solenoid valve according to claim 1, characterized in that It also includes a valve core, which can abut against the valve mouth part. The inner diameter of the valve mouth of the valve mouth part is defined as d, and the following is satisfied: 2.5≥D / d≥2.

3. The solenoid valve according to claim 2, characterized in that: The valve core is a steel ball, and the valve mouth portion includes an extruded hole section and a straight hole section. The extruded hole section is formed by extrusion, and the valve core can be offset against the extruded hole section. The inner diameter of the extruded hole section gradually decreases downward along the axial direction of the valve body, and the straight hole section includes the valve mouth.

4. The solenoid valve according to claim 1, characterized in that: The upper section includes a curved portion, the curved portion connects the upper cylindrical portion and the lower section, the upper end portion of the first connecting pipe contacts the curved portion, and the first connecting pipe is fixed to the valve seat by welding.

5. The solenoid valve according to claim 4, characterized in that The first connecting pipe includes a first matching portion, the first matching portion is at least partially located in the inner cavity of the valve seat, the upper end of the first matching portion is in contact with the bent portion, and the minimum inner diameter of the first connecting pipe is located in the first matching portion.

6. The solenoid valve according to claim 5, characterized in that The lower section also includes a bending portion, which is formed by bending outward from the lower end of the lower cylindrical portion along the radial direction of the valve seat. The bending portion is higher than the lower end of the valve body, and the bending portion is welded and fixed to the valve body.

7. The solenoid valve according to claim 5, characterized in that The matching length between the first matching portion and the lower cylindrical portion is defined as A1, then: A1>1.5mm; the thickness of the top is defined as A2, then: A2>0.5mm.

8. The solenoid valve according to any one of claims 1 to 7, characterized in that: It also includes a second connecting pipe, which includes a second matching portion. The second matching portion passes through the side hole of the valve body. Along the radial direction of the valve body, the second matching portion contacts the upper cylindrical portion. Along the axial direction of the valve body, the top is flush with the central axis of the second matching portion.

9. The solenoid valve according to claim 8, characterized in that It also includes a gasket, the thickness of which is greater than the wall thickness of the valve body, the gasket includes a mounting hole, the second matching portion matches with the hole wall of the side hole and the hole wall of the mounting hole, and the second connecting pipe, the valve body and the gasket are welded and fixed.

10. The solenoid valve according to claim 8, characterized in that Along the axial direction of the valve seat, the height of the upper section is defined as H1, and the height of the lower section is defined as H2, then: H1≤2H2.

11. The solenoid valve according to any one of claims 1 to 7, characterized in that: It also includes a second connecting pipe, which passes through the side hole of the valve body. The second connecting pipe includes an outer convex portion, and the outer diameter of the outer convex portion is larger than the hole diameter of the side hole. Along the radial direction of the valve body, the outer convex portion is in contact with the valve body, and along the axial direction of the valve body, the top is flush with the central axis of the second connecting pipe.

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