Pilot-operated type electromagnetic valve

Abstract

The utility model provides a pilot-operated type electromagnetic valve which comprises a valve body part and a valve head part, the valve head part comprises a valve cover, a piston part and a limiting part, the valve cover is detachably connected with the valve body part, the valve cover comprises an inner cavity, at least part of the piston part is located in the inner cavity, the valve body part comprises a main valve port part, the piston part can abut against the main valve port part, and the valve cover comprises a limiting groove. The limiting piece comprises a clamping part and a limiting part, the clamping part is at least partially located in the limiting groove, and the limiting part can make contact with the piston component to limit the piston component to be separated from the valve deck. Compared with the prior art, by optimizing the structure of the electromagnetic valve, the convenience of maintaining the electromagnetic valve is improved.

Description

Technical Field

[0001] The present application relates to the technical field of valves in refrigeration systems, and in particular to a pilot-operated solenoid valve. Background Art

[0002] Solenoid valve products are widely used and are generally used to control the opening or closing of fluids. Figure 1 FIG. 1 is a cross-sectional diagram of a solenoid valve in the background art. Figure 1 As shown, the solenoid valve comprises a valve body 1, a piston 2, and a pilot valve 3. The pilot valve 3 includes a valve cover 31, which is threadedly connected to the valve body 1. The piston 2 is axially movable relative to the valve body 1. This solenoid valve is detachable, meaning threaded. During maintenance, the valve cover 31 can be threadedly removed from the valve body 1. However, the piston 2 remains within the inner cavity of the valve body 1. Since the solenoid valve's connecting pipe is welded to the system piping, it is difficult to remove the piston 2 during maintenance.

[0003] In view of this, how to optimize the structure of the solenoid valve and improve the convenience of maintaining the solenoid valve has become a problem considered by those skilled in the art. Utility Model Content

[0004] To solve the above problems, the present application provides a pilot-operated solenoid valve that can realize the integral disassembly and assembly of the piston component and the pilot valve component. The specific technical solution is as follows:

[0005] A pilot solenoid valve includes a valve body component and a valve head component. The valve head component includes a valve cover, a piston component, and a limit member. The valve cover is detachably connected to the valve body component. The valve cover includes an inner cavity. The piston component is at least partially located in the inner cavity. The valve body component includes a main valve mouth portion. The piston component can abut the main valve mouth portion. The valve cover includes a limit groove. The limit member includes a clamping portion and a limit portion. The clamping portion is at least partially located in the limit groove. The limit portion can contact the piston component to limit the piston component from separating from the valve cover.

[0006] The pilot solenoid valve provided in the present application has a valve cover including a limit groove, and the valve cover and the valve body component are detachably connected, a portion of the limit member is located in the valve cover limit groove, and another portion of the limit member can contact the piston component. When the pilot solenoid valve needs to be repaired, the valve cover and the valve body component can be threadedly disassembled and the piston component can be taken out at the same time, which is convenient for maintenance.

[0007] Furthermore, in the pilot-operated solenoid valve provided in the present application, the limiting groove of the valve cover is arranged on the outer wall or the inner wall of the valve cover, and the limiting groove is in the shape of a circular ring, which is convenient for machining and also convenient for installing the limiting parts, thereby improving assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1The figure shows a schematic structural diagram of a pilot-operated solenoid valve in the background art;

[0009] Figure 2 The figure shows a cross-sectional schematic diagram of the pilot-operated solenoid valve provided by the present invention;

[0010] Figure 3 Shown Figure 2 Schematic diagram of the valve cover cross section;

[0011] Figure 4 Shown Figure 2 Schematic diagram of the middle limiter;

[0012] Figure 5 Shown Figure 2 Schematic diagram of the middle valve cover and the limiter after assembly in one direction;

[0013] Figure 6 Shown is a schematic cross-sectional view of a valve cover according to another embodiment of the present application;

[0014] Figure 7 Shown is a schematic diagram of a position limiting member according to another embodiment of the present application;

[0015] Figure 8 Shown Figure 7 A schematic diagram of another direction;

[0016] Figure 9 Shown Figure 6 The valve cover and Figure 7 A schematic diagram of one direction after the limiting part is assembled;

[0017] Reference numerals:

[0018] 100-valve body parts;

[0019] 11-valve seat, 111-main valve port, 112-mounting portion, 1120-step portion;

[0020] 500-valve head parts;

[0021] 51-pilot valve component;

[0022] 511-valve sleeve components, 5110-valve sleeve

[0023] 52-valve cover;

[0024] 521-main body, 5210-limiting groove, 5210A-limiting groove, 5212A-first groove sidewall, 5213-second groove sidewall, 522-external protrusion;

[0025] 5221-first mating section, 5222-second mating section, 5230-threaded mounting portion;

[0026] 53-piston component;

[0027] 531-piston, 532-piston seal, 5321-pilot valve port, 5322-main valve port seal

[0028] 54-limiting piece; 54A-limiting piece

[0029] 541-clamping portion, 541A-clamping portion, 542-limiting portion, 542A-limiting portion, 543-bending portion,

[0030] 5431-first bending portion, 5432-second bending portion, 5433-third bending portion. Specific embodiments

[0031] Here, exemplary embodiments will be described in detail, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numerals in different drawings represent the same or similar elements.

[0032] It should be understood that the words “first”, “second” and similar terms used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, “several” means two or more quantities, unless otherwise specified. The directional words such as up, down, left, right, front, back, inside, outside, top, bottom, etc. mentioned or may be mentioned in the text are defined relative to the structure shown in the corresponding drawings. They are relative concepts and may therefore change accordingly according to their different positions and different usage states. Therefore, these or other directional terms should not be interpreted as restrictive terms. Words such as “include” or “comprise” and the like mean that the elements or objects appearing before “include” or “comprise” include the elements or objects listed after “include” or “comprise” and their equivalents, and do not exclude other elements or objects.

[0033] The pilot-operated solenoid valve of the present application will be described in detail below with reference to the accompanying drawings. In the absence of conflict, the features of the following embodiments and implementations may complement or be combined with each other.

[0034] like Figure 2 、 Figure 3 、 Figure 4As shown, a pilot solenoid valve includes: a valve body component 100, a valve head component 500, the valve head component 500 includes a valve cover 52, a piston component 53, and a limit member 54, the valve cover 52 is detachably connected to the valve body component 100, and the detachable connection here specifically refers to a threaded connection, the valve cover 52 and the valve body component 100 are threadedly connected. In the refrigeration system, the pilot solenoid valve is welded and fixed in the pipeline. If the piston component 53 needs to be repaired and replaced, the valve head component 500 needs to be threadedly removed from the valve body component 100. The solution given in this application prevents the piston component 53 from detaching from the valve cover 52 by setting a limit member 54, thereby realizing the detachment of the entire valve head component 500 from the valve body component 100. The valve cover 52 includes an inner cavity, with the piston component 53 at least partially located in the inner cavity. The valve body component 100 includes a main valve opening 111, and the piston component 53 can abut the main valve opening 111. The valve cover 52 includes a limiting groove 5210. The limiting member 54 includes a clamping portion 541 and a limiting portion 542. The clamping portion 541 is at least partially located in the limiting groove 5210, and the limiting portion 542 can contact the piston component 53 to prevent the piston component 53 from separating from the valve cover 52. The valve head component 500 also includes a pilot valve component 51. The inner cavity wall of the main body 521 also includes a second mating section 5222. The pilot valve component 51 includes a valve sleeve component 511. The valve sleeve component 511 includes a valve sleeve 5110. The second mating section 5222 is fixedly mated with the valve sleeve 5110. The fixed mating herein specifically refers to welding, such as laser welding. The outer wall of the piston component 53 is slidably engaged with the first mating section 5221. When the piston component 53 abuts the main valve mouth portion 111, the limiting portion 542 does not contact the piston component 532. This arrangement is to ensure the movement stroke of the piston component 53, avoid interference, and improve the sealing performance of the product. The piston component 53 includes a piston 531 and a piston seal 532. The piston 531 and the piston seal 532 are fixedly engaged. The fixed engagement here can specifically be riveted. The piston seal 532 includes a pilot valve mouth portion 5321 and a main valve mouth sealing portion 5322. The pilot valve mouth portion 5321 is located on a side of the piston seal 532 close to the pilot valve component 51, and the main valve mouth sealing portion 5322 is located on a side of the piston seal 532 away from the pilot valve component 51.

[0035] like Figure 1 As shown in the figure, a pilot solenoid valve in the background technology includes a valve body component 1, a piston component 2 and a pilot valve component 3. The piston component 2 is a moving component in the pilot solenoid valve, which reciprocates in the inner cavity of the valve cover 31. The outer diameter of the piston component 2 is slidably matched with the inner cavity wall of the valve cover 31. There is a gap between the outer diameter of the piston component 2 and the inner cavity wall of the valve cover 31.

[0036] Therefore, when the valve cover 31 is threadedly detached from the valve body component 1, the piston component 2 will remain in the inner cavity of the valve body component 1, making it inconvenient to remove the piston component 2 for maintenance and replacement. In the pilot-operated solenoid valve of the present application, a portion of the limiter 54 is located in the limiter groove 5210 of the valve cover 52, and a portion contacts the piston component 53 and restricts the piston component 53 from being separated from the valve cover 52. That is, when the valve cover 52 is threadedly detached from the valve body component 100, the limiter 542 of the limiter 54 can contact the piston component 53 and restrict the piston component 53 from being separated from the valve cover 52. When the valve cover 52 is threadedly detached from the valve body component 100, the entire valve head component 500 is detached from the valve body component 100, and the limiter 54 is detachably connected to the valve cover 52. After the limiter 54 is removed, it is convenient for the piston component 53 to be separated from the valve cover 52, and the next step of replacing the piston component 53 for maintenance can be carried out.

[0037] Specifically, the limiting member 54 is detachably connected to the valve cover 52. The detachable connection here refers to an elastic snap connection. The snap connection portion 541 is elastically snapped into the limiting groove 5210. The limiting member 54 can be installed into the limiting groove 5210 by a tool, and the limiting member 54 can also be removed from the limiting groove 5210 by a tool. The structure is simple and easy to install. Specifically, the snap connection portion 541 includes an opening. Along the radial direction of the valve cover 52, the limiting portion 542 extends from the end of the opening toward the center of the inner cavity of the valve cover 52. The limiting portion 542 at least partially contacts the piston component 53. The setting of the limiting portion 542 is to ensure that when the valve cover 52 is disassembled, it can abut against the piston component 53 to prevent the piston component 53 from detaching from the valve cover 52. The setting of the opening provides the snap connection portion 541 with a deformation space, which facilitates the elastic snap connection into the limiting groove 5210. It should be noted that the retaining member 54 is formed from a wound spring steel wire. Specifically, the engaging portion 541 is annular, and the size of the engaging portion 541 is matched to the size of the retaining groove 5210. For example, the outer diameter of the engaging portion 541 in its free state is larger than the bottom diameter of the retaining groove 5210. The outer diameter of the engaging portion 541 is defined as A1, and the bottom diameter of the retaining groove 521 is defined as A2. Then, 1% A2 > A1 > 0.5% A2. With this configuration, the engaging portion 541 is compressed and squeezed into the retaining groove 521. Then, the engaging portion 541 elastically engages in the retaining groove 521 under its own rebound force, thereby retaining the retaining member 54 relative to the valve cover 52. This configuration prevents the retaining member 54 from shaking in the retaining groove 5210, thereby preventing noise generation. It also improves the assembly stability of the retaining member 54, further ensuring that the piston component 53 is prevented from separating from the valve cover 52. The limiting portion 542 is formed by bending, and the bending size and bending angle are not fixed and can be adjusted accordingly according to the size of the valve cover 52 and the piston component 53, as long as the limiting portion 542 after bending can contact the piston component 53, the use requirement of limiting the piston component 53 from separating from the valve cover 52 is achieved.

[0038] like Figure 3 As shown, the valve cover 52 includes a main body 521, which is cylindrical and includes an inner cavity. The inner side wall of the end of the main body 521 close to the main valve mouth 111 includes the limiting groove 5210. Along the radial direction of the valve cover 52, the limiting groove 5210 is radially recessed outward from the inner wall of the inner cavity. The valve cover 52 also includes an outer protrusion 522, which extends radially outward from an end of the main body 521 away from the main valve port 111. The outer protrusion 522 includes an abutment surface 5221 facing the valve seat 11. The outer wall of the main body 521 also includes a threaded mounting portion 5230, which is threadedly connected to the valve body component 100. In the longitudinal direction of the pilot solenoid valve, the threaded mounting portion 5230 is located between the outer protrusion 522 and the limiting groove 5210. The limiting groove 5210 is located in the inner hole wall of the main body 521 and is a complete annular groove. The limiting groove 5210 is provided on the outer wall or inner wall of the valve cover 52. The annular shape of the limiting groove 5210 facilitates machining and installation of the limiting member, thereby improving assembly efficiency.

[0039] The valve body component 100 includes a valve seat 11, which includes a main valve port portion 111 and a mounting portion 112. The mounting portion 112 is threadedly engaged with the valve cover 52. The mounting portion 112 includes a step portion 1120 with a stepped surface facing the outer protrusion 522, and the stepped surface abuts the abutting surface 5221. The provision of the step portion 1120 makes the threaded installation of the valve cover 52 and the valve body component 100 more reliable. The step surface, serving as a sealing surface, can be configured as a flat surface, a convex surface, or a concave surface. The shape of the step surface is configured to match the shape of the abutting surface. If the step surface is configured as a flat surface, the abutting surface is configured as a flat or convex surface; if the step surface is configured as a concave surface, the abutting surface is configured as a convex surface; if the step surface is configured as a convex surface, the abutting surface is configured as a flat surface. In this configuration, the step surface and the sealing surface are in flat contact or in concave-convex contact, which can improve sealing performance.

[0040] In one embodiment, if Figure 6 、 Figure 7 、 Figure 8As shown, the outer wall of the main body 521, on the side away from the pilot valve component 51, includes a limiting groove 5210A. The limiting groove 5210A is recessed radially inward from the outer wall along the radial direction of the valve cover 52. The limiting groove 5210A includes a groove sidewall 5212A. The outer wall of the main body 521 serves as the groove sidewall 5212A. The outer wall diameter of the threaded mounting portion 5230 is larger than the diameter of the groove sidewall 5212A. This arrangement can reduce the weight of the components of the valve cover 52 and the bottom wall diameter of the limiting groove 5210A. This can also reduce the size of the limiting member 54, facilitating product miniaturization. In this embodiment, the limiting member 54A also includes a bent portion 543. One end of the bent portion 543 is connected to the clamping portion 541A, and the other end of the bent portion 543 is connected to the limiting portion 542A. The bent portion 543 is partially located below the valve cover 52. It should be noted that the bent portion 543 is provided to connect the clamping portion 541A and the limiting portion 542A to accommodate valve covers 52 of different structures. In this embodiment, the bent portion 543 includes a first bent portion 5431, a second bent portion 5432, and a third bent portion 5433. The first bent portion 5431 extends radially outward from the clamping portion 541, the second bent portion 5432 extends downward from the outer end of the first bent portion 5431 away from the clamping portion 541 and exceeds the lower end of the valve cover 52, and the third bent portion 5433 extends from one end of the second bent portion 5432 away from the first bent portion 5431 toward the center of the inner cavity of the valve cover 52. The limiting member 54A of this structure can meet the structure in which the limiting groove 5210 is set on the outer wall of the valve cover 52. There is no need to punch holes or re-grooves on the bottom wall of the limiting groove 5210A, and the limiting part 542A can be set in the inner cavity of the valve cover 52 to achieve the ultimate purpose of contacting the piston component 53 and limiting the piston component 53 from separating from the valve cover 52. The shape of the clamping portion 541A here is annular, and the shape of the limiting groove 5210A is annular. The shape of the clamping portion 541A matches the limiting groove 5210A. The clamping portion 541A is clamped with the bottom wall of the limiting groove 5210A. When the limiting member 54A is in a free state, the diameter of the inner ring of the clamping portion 541A abutting the limiting groove 5210A is smaller than the diameter of the bottom wall of the limiting groove 5210A. The outer diameter of the clamping portion 541A is defined as B1, and the diameter of the bottom wall of the limiting groove 5210 is defined as B2. Then 1% B2<B1 <3% B2. With such arrangement, when the clamping portion 541A is installed into the limiting groove 5210A, the clamping portion 541A is stretched and arranged in the limiting groove 5210A, and then elastically clamped in the limiting groove 5210A by the rebound force of the clamping portion 541A itself, so that the limiting member 54 and the valve cover 52 are relatively limited. Such arrangement can avoid the shaking of the limiting member 54A in the limiting groove 5210A, on the one hand to avoid noise generation, and on the other hand to improve the assembly stability of the limiting member 54A, and further ensure that the piston component 53 is restricted from being separated from the valve cover 52.

[0041] In one embodiment, if Figure 3 As shown, the limiting groove 5210 includes a first groove sidewall 5212 and a second groove sidewall 5213. The inner cavity wall of the main body 521 includes a first mating section 5221, which slidably engages with the outer wall of the piston component 53. The first mating section 5221 serves as the first groove sidewall 5212. The inner diameter of the second groove sidewall 5213 is larger than that of the first mating section 5221. The second groove sidewall 5213 is located below the first groove sidewall 5212. The first mating section 5221 serves as the first groove sidewall 5212 to facilitate the assembly and movement of the piston component 53. The inner diameter of the second groove sidewall 5213 is larger than that of the first mating section 5221 to facilitate the assembly of the limiting member 54. This arrangement can also reduce the difficulty of manufacturing the limiting groove 5210.

[0042] It should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although this specification has described the present invention in detail with reference to the above embodiments, ordinary technicians in this field should understand that technicians in the relevant technical field can still modify or replace the present invention with equivalents, and all technical solutions and improvements that do not depart from the spirit and scope of the present invention should be included in the scope of the present invention.

Claims

1. A pilot-operated solenoid valve, characterized in that: The invention comprises a valve body component and a valve head component, the valve head component comprises a valve cover, a piston component and a limiting component, the valve cover is detachably connected to the valve body component, the valve cover comprises an inner cavity, the piston component is at least partially located in the inner cavity, the valve body component comprises a main valve mouth portion, the piston component can abut against the main valve mouth portion, the valve cover comprises a limiting groove, the limiting component comprises a clamping portion and a limiting portion, the clamping portion is at least partially located in the limiting groove, and the limiting portion can contact the piston component to limit the piston component from separating from the valve cover.

2. The pilot-operated solenoid valve according to claim 1, characterized in that: The limiting member is detachably connected to the valve cover, the clamping portion includes an opening, and along the radial direction of the valve cover, the limiting portion extends from the end of the opening toward the center of the inner cavity of the valve cover, and at least part of the limiting portion can contact the piston component.

3. The pilot-operated solenoid valve according to claim 2, characterized in that: The limiting member further includes a bending portion, one end of the bending portion is connected to the clamping portion, and the other end of the bending portion is connected to the limiting portion, and the bending portion is partially located below the valve cover.

4. The pilot-operated solenoid valve according to claim 3, characterized in that: The bending portion includes a first bending portion, a second bending portion, and a third bending portion. The first bending portion extends radially outward from the clamping portion, the second bending portion extends downward from the outer end of the first bending portion away from the clamping portion and exceeds the lower end of the valve cover, and the third bending portion extends from an end of the second bending portion away from the first bending portion toward the center of the inner cavity of the valve cover.

5. The pilot-operated solenoid valve according to claim 4, characterized in that: The valve head component also includes a pilot valve component, the valve cover includes a main body and an outer convex portion, the limiting groove is located at one side end of the main body close to the main valve mouth, the main body is cylindrical, the main body includes an inner cavity, the outer convex portion extends radially outward from one side end of the main body away from the valve body component, the outer side wall of the main body also includes a threaded mounting portion, the threaded mounting portion is threadedly connected to the valve body component, in the longitudinal direction of the pilot solenoid valve, the threaded mounting portion is located between the outer convex portion and the limiting groove, the inner cavity wall of the main body at one side end away from the pilot valve component includes the limiting groove, and along the radial direction of the valve cover, the limiting groove is radially recessed outward from the inner wall of the inner cavity.

6. The pilot-operated solenoid valve according to claim 4, characterized in that: The valve head component also includes a pilot valve component, the valve cover includes a main body and an outer protrusion, the limiting groove is located at one side end of the main body close to the main valve mouth, the main body is cylindrical, the main body includes an inner cavity, the outer protrusion extends radially outward from one side end of the main body away from the valve body component, the outer side wall of the main body also includes a threaded mounting portion, the threaded mounting portion is threadedly connected to the valve body component, in the longitudinal direction of the pilot solenoid valve, the threaded mounting portion is located between the outer protrusion and the limiting groove, the outer side wall of the main body at one side end away from the pilot valve component includes the limiting groove, and along the radial direction of the valve cover, the limiting groove is radially recessed inward from the outer side wall.

7. The pilot-operated solenoid valve according to claim 6, characterized in that: The limiting groove includes a first groove side wall, the outer side wall of the main body portion serves as the first groove side wall, and the diameter of the outer side wall of the threaded mounting portion is greater than the diameter of the first groove side wall.

8. The pilot-operated solenoid valve according to claim 5, characterized in that: The limiting groove includes a second groove side wall, the inner cavity wall of the main body includes a first mating section, the first mating section is slidably mated with the outer wall of the piston component, the inner diameter of the second groove side wall is larger than the inner diameter of the first mating section, and the second groove side wall is located below the first mating section.

9. The solenoid valve according to any one of claims 1 to 8, characterized in that: The valve head component also includes a pilot valve component, the valve cover includes a main body, the inner cavity wall of the main body also includes a second mating section, the pilot valve component includes a valve sleeve component, the second mating section is fixedly mated with the valve sleeve component, and when the piston component abuts the main valve mouth, the limiting portion does not contact the piston component.

10. The solenoid valve according to claim 9, characterized in that The piston component includes a piston and a piston seal. The piston is fixedly matched with the piston seal. The piston seal includes a pilot valve opening and a main valve opening sealing portion. The pilot valve opening is located on a side close to the pilot valve component, and the main valve opening sealing portion is located on a side away from the pilot valve component. The valve cover also includes an outer protrusion, which extends radially outward from the end of the main body on one side away from the valve body component. The valve body component includes a valve seat, and the valve seat includes a main valve mouth and a mounting portion. The mounting portion is threadedly engaged with the valve cover, and the mounting portion includes a step portion with a step surface facing the outer protrusion, and the step surface abuts the outer protrusion.

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