Electromagnetic valve

Abstract

An electromagnetic valve. A sealing fitting portion has a first projection area (Q1) on a reference projection surface; a valve plug hole channel (521) has a second projection area (Q2) on the reference projection surface; and part of a valve plug (52) located between the sealing fitting portion and the valve plug hole channel (521) has a third projection area (Q3) on the reference projection surface, the third projection area (Q3) being located between the first projection area (Q1) and the second projection area (Q2). When a movable iron core (51) and the valve plug (52) are in sealing fit, the sealing fitting portion avoids the position of the valve plug hole channel (521), thus relatively ensuring the sealing fit between the movable iron core (51) and the valve plug (52).

Description

A solenoid valve

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on September 27, 2023, with application number 202311255775.9 and application name “A Solenoid Valve”, the entire contents of which are incorporated by reference into this application. Technical Field

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

[0003] As an electric control device, the solenoid valve is usually used in pneumatic textile machines. It includes a static iron core, a moving core assembly, a sleeve and a valve body. The valve body is provided with a large valve mouth. The moving core assembly includes a moving core and a sealing block. The sealing block can approach or move away from the large valve mouth. The sealing block is provided with a through hole running through its upper and lower surfaces. The through hole is arranged corresponding to the moving core. When the sealing block abuts the moving iron core, the through hole is integrally injection molded by the sealing block. The edge of the through hole of the sealing block will produce burrs in the injection molding process, or the right-angle edge of the through hole is easily deformed by convex or concave due to injection molding cooling. There is a risk of leakage at the small valve mouth. For technical personnel in this field, it is necessary to ensure the sealing reliability between the moving core and the sealing block as much as possible.

[0004] Summary of the Invention

[0005] An object of the present invention is to provide a solenoid valve that can relatively ensure the sealing fit between the moving iron core and the sealing block.

[0006] At least one embodiment of the present invention provides a solenoid valve, including a core assembly, the core assembly including a movable iron core and a valve plug, the movable iron core including a base portion, a connecting portion, and a sealing portion, the sealing portion protruding from the lower end surface of the base portion, the connecting portion being positionally connected to the valve plug, the valve plug being provided with a valve plug channel extending through its upper and lower surfaces, the valve plug including a sealing surface portion, the sealing portion being capable of abutting against the sealing surface portion to form a sealing mating portion;

[0007] The solenoid valve is defined as being provided with a reference projection surface perpendicular to the axis of the core assembly, the sealing fitting portion having a first projection area on the reference projection surface, the valve plug channel having a second projection area on the reference projection surface, and the portion of the valve plug located between the sealing fitting portion and the valve plug channel having a third projection area on the reference projection surface, wherein the third projection area is located between the first projection area and the second projection area.

[0008] Through the optimized design of the solenoid valve structure, the sealing fitting part has a first projection area on the reference projection plane, the valve plug channel has a second projection area on the reference projection plane, and the part of the valve plug located between the sealing fitting part and the valve plug channel has a third projection area on the reference projection plane, wherein the third projection area is located between the first projection area and the second projection area. When the moving iron core and the valve plug are sealed together, the sealing part of the moving iron core is abutted against the sealing surface part of the valve plug. The setting position of the second projection area corresponding to the sealing fitting part is separated from the first area corresponding to the valve plug channel by the third projection area corresponding to the part of the valve plug, so as to avoid the position of the edge of the valve plug channel, thereby greatly reducing the influence of burrs around the valve plug through hole during the valve plug injection molding process or deformation due to injection cooling, and can relatively guarantee the sealing fit between the moving core and the valve plug. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] FIG1 is a cross-sectional view of the overall structure of the solenoid valve provided by the present invention;

[0010] FIG2 is a schematic cross-sectional view of the core assembly of FIG1 ;

[0011] FIG3 is a schematic cross-sectional view of a moving iron core provided by the present invention;

[0012] FIG4 is a cross-sectional view of the valve plug structure provided by the present invention;

[0013] FIG5 is a schematic diagram of a projection of the valve plug and the sealing portion of the solenoid valve provided by the present invention on a reference projection plane in a closed valve state.

[0014] The following are the descriptions of the reference numerals:

[0015] Valve body 10, first valve mouth portion 10a, inlet channel 11, outlet channel 12, external threaded portion 13, valve mouth channel 14, threaded part 20, internal threaded portion 21, pressing portion 22, sleeve 30, main body portion 31, flanging portion 32, static iron core 40, core assembly 50, moving iron core 51, valve plug 52, base portion 511, connecting portion 512, through channel 5111, sealing portion 5112, limiting portion 5121, supporting portion 5122, second valve mouth portion 52a, valve plug channel 521, step portion 522, gasket 53, elastic part 60, sealing part 70, first projection area Q1, second projection area Q2, third projection area Q3. DETAILED DESCRIPTION

[0016] In order to enable those skilled in the art to better understand the technical solution provided by the present application, the technical solution of the present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] The present application focuses on optimizing the design and improvement of the matching structure between the moving iron core and the valve plug of the core assembly, by making the sealing matching part have a first projection area on the reference projection plane, the valve plug channel has a second projection area on the reference projection plane, and the part of the valve plug located between the sealing matching part and the valve plug channel has a third projection area on the reference projection plane, wherein the third projection area is located between the first projection area and the second projection area. When the moving iron core and the valve plug are sealed, the sealing part of the moving iron core is against the sealing surface part of the valve plug, and the setting position of the second projection area corresponding to the sealing matching part is separated from the first area corresponding to the valve plug channel by the third projection area corresponding to the part of the valve plug, so as to avoid the position of the edge of the valve plug channel, thereby greatly reducing the influence of burrs around the valve plug through hole during the valve plug injection molding process or deformation due to injection cooling, and can relatively guarantee the sealing matching between the moving core and the valve plug. For other components such as the static iron core, valve body, etc., adaptive improvements can be made according to the use environment or design.

[0018] 1-4 is a schematic cross-sectional view of the entire electronic valve, comprising a valve body 10, a threaded member 20, a sleeve 30, a static iron core 40 and a core assembly 50. The valve body 10 is provided with a first valve port portion 10a, an inlet channel 11, an outlet channel 12 and a valve port channel 14. The threaded member 20 includes an internal threaded portion 21 and a pressing portion 22. The valve body is further provided with an external threaded portion 13 and a groove. The internal threaded portion 21 and the external threaded portion 13 are threadedly connected and tightened. The sealing member 70 is limited in the groove of the valve body. The sleeve 30 includes a main body portion 31 and a flange portion 32. One side of the main body portion 31 is welded and fixed to the static iron core 40. The flange portion 32 is circumferentially flanged outward from the other side of the main body portion 31. Through the threaded tightening action between the threaded member 20 and the valve body 10, one side of the flange portion 32 is abutted against the pressing portion 22, and the other side of the flange portion 32 is abutted against the sealing member 70 to form a sealing fit.

[0019] The core assembly 50 includes a moving iron core 51, a valve plug 52 and a gasket 53. An elastic member 60 is provided between the static iron core 40 and the moving iron core 51. The moving iron core 51 is provided with a through hole 5111 running through the upper and lower surfaces thereof. The through hole 5111 includes a vertical hole and an inclined hole. The moving iron core 51 includes a base portion 511, a connecting portion 512 and a sealing portion 5112. The base portion 511 and the connecting portion 512 can be set as an integral structure. The connecting portion 512 protrudes outwardly from the base portion 511 in the circumferential direction. The sealing portion 5112 protrudes downward from the lower end surface of the base portion 511. The connecting portion 512 is limitedly connected to the valve plug 52. The connecting portion 512 includes a peripheral wall portion, a limiting portion 5121 and a supporting portion 5122. The limiting portion 5121 protrudes radially inwardly from the peripheral wall portion. 3 is sleeved on the base portion and supported on the support portion 5122. The valve plug 52 includes a second valve opening portion 52a and is provided with a valve plug channel 521 running through its upper and lower surfaces. The valve plug channel 521 is a straight hole channel structure with substantially equal diameter. At least part of the right-angle portion corresponding to the valve plug channel 521 forms the second valve opening portion 52a. The valve plug 52 includes a large diameter portion, a small diameter portion, and a tapered portion. The large diameter portion is located between the small diameter portion and the tapered portion. A step portion 522 is formed between the large diameter portion and the small diameter portion. The valve plug 52 also includes a sealing surface portion 525 and a second sealing surface portion 524. The sealing surface portion 525 and the second sealing surface portion 524 are located on different sides of the valve plug. The step portion 522 can abut against the limiting portion 5121, and the sealing portion 5112 can abut against or be away from the sealing surface portion.

[0020] 5 in combination with FIG1-FIG4 , the solenoid valve is defined as having a reference projection surface perpendicular to the axis of the core assembly 50. In the closed valve state, the sealing portion 5112 abuts against the sealing surface portion 525 of the valve plug, and the second sealing surface portion 524 of the valve plug abuts against the first valve port portion 10a. The sealing portion 5112 abuts against the sealing surface portion 525 to form a sealing fitting portion. It should be noted that the sealing fitting portion refers to the abutting fitting surface formed by the sealing portion 5112 and the sealing surface portion 525 of the valve plug abutting against each other in the closed valve state. The sealing fitting portion is defined as forming a first projection area Q1 on the reference projection surface, and the valve plug channel 521 forms a second projection area Q2 on the reference projection surface. There is no overlapping area between the first projection area Q1 and the second projection area Q2. The portion of the valve plug 52 located between the sealing fitting portion and the valve plug channel 521 has a third projection area Q3 on the reference projection surface, wherein the third projection area Q3 is located between the first projection area Q1 and the second projection area Q2. In the background technology, the valve plug is usually processed by one-piece injection molding. In the injection molding process, burrs will be generated around the through hole of the sealing block, or convex or concave deformations will easily occur at the edge of the through hole due to injection molding cooling, and poor leakage will easily occur at the small valve port in the fully closed state. Through the above design, the second projection area Q2 corresponding to the sealing fitting part is separated from the first projection area Q1 corresponding to the valve plug channel by the third projection area Q3. During the valve plug injection molding process, even if burrs are generated or deformation occurs due to cooling injection molding, the edge of the valve plug channel corresponding to the first projection area Q1 will not affect the position of the second projection area Q2 corresponding to the sealing fitting part, that is, the sealing part of the moving iron core and the sealing surface part of the valve plug are against each other. The setting position of the second projection area corresponding to the sealing fitting part is avoided by the third projection area corresponding to part of the valve plug and the first projection area corresponding to the valve plug channel, so as to avoid the position of the edge of the valve plug channel, thereby greatly reducing the influence of burrs around the valve plug through hole or deformation due to injection molding cooling during the valve plug injection molding process, and can relatively guarantee the sealing fit between the moving core and the valve plug.

[0021] Specifically, the portion of the valve plug 52 located between the sealing mating portion and the valve plug channel 521 has a third projection area Q3 on the reference projection plane, wherein the third projection area Q3 is located between the first projection area Q1 and the second projection area Q2. Specifically, the sealing portion 5112 has a conical groove that is recessed inward from the surface of the sealing portion, and the diameter of the conical groove is defined as D1, and the aperture of the valve plug channel 521 is defined as D2, wherein 1.2D2<D1<3D2. By setting the above parameters, the sealing portion can better avoid the position of the valve plug channel without affecting the through channel 5111. The processing setting of the sealing portion 5112 also includes a rounded corner portion 51121 to prevent the risk of damaging the sealing surface of the valve plug 52 caused by other right-angle or sharp-angle structures, thereby ensuring good sealing performance. In this embodiment, the sealing surface 525 of the valve plug is a planar structure, and the sealing portion 5112 includes a planar portion corresponding to the sealing surface. The planar portion can be matched with the planar sealing surface to achieve a better sealing fit between the moving iron core and the valve plug. It should be noted that the sealing portion can also be set to include an arc-shaped portion to achieve a match with the planar sealing surface, or the flat portion of the sealing portion can be matched with the flat sealing surface. The face part is matched with the sealing face part of the arc-shaped structure. As long as the seal between the two can be achieved, there is no restriction on the structure of the sealing face part and the specific structure of the sealing part used to achieve the match with the sealing face part. The valve plug 52 can be made of elastic TPU material, which has high elasticity, high cushioning and high wear resistance and is more suitable for use in high-frequency solenoid valves; the diameter of the limiting part is defined as D3, the diameter of the conical part of the valve plug 52 away from the large diameter part is D4, and the diameter of the large diameter part is D6, where D3>D4. When the moving iron core and the valve plug are connected and installed in a limited manner, the valve plug can be connected with the conical surface. The setting of the part is more convenient for installation into the connecting part. There is a gap between the peripheral wall part and the large diameter part of the connecting part 521, among which 0.1mm≤D5-D6≤0.3mm, which can ensure the relatively flexible movement of the valve plug in the connecting part, but the gap between the valve plug and the moving iron core is not too large to allow left and right translation to cause poor leakage; in the closed valve state, in order to make the valve plug move left and right in the connecting part, the sealing matching part can always avoid the position of the valve plug channel 521 to ensure the sealing matching between the moving iron core and the valve plug, the following setting can be made: D5-D6<D1-D2.

[0022] The operating principle of the solenoid valve is described below. A coil component is sleeved on the outer periphery of the sleeve 30. When the coil component is energized, the moving iron core 51 moves axially upward toward the static iron core 40 under the excitation of the coil component. The elastic member 60 is compressed, and the sealing portion 5112 is separated from the state of being in contact with the sealing surface portion 525. As the sealing portion 5112 moves away from the sealing surface portion, the gas pressure accumulated in the through-hole 5111 at the moment of valve opening and the gas pressure between the static iron core 40 and the moving iron core 51 above the through-hole 5111 are quickly discharged from the outlet channel 12 through the valve plug hole 521 and the valve port hole 14. The moving iron core 51 continues to move upward until the limit portion 5121 contacts the step portion 522, and the moving iron core 51 The solenoid valve is in a fully open state when the valve plug 52 moves upward together with the valve plug 52, and the valve plug 52 moves away from the first valve mouth part 10a. The first valve mouth part 10a is opened. When the gasket 53 abuts against the flange part 32, the solenoid valve is in a fully open state. At this time, the inlet channel 11, the through-hole 5111, the valve plug hole 521, the valve mouth hole 14 and the outlet channel 12 are in a connected state; when the coil component is in a power-off state, due to the reduction of the excitation of the coil component and the restoring force of the elastic member 60, the valve plug 52 abuts against the first valve mouth part 10a, and the sealing part 5112 abuts against the sealing surface part 525. At this time, the limiting part 5121 is away from the step part 522, and the gasket 53 is away from the flange part 32. The gas pressure in the inlet channel 11 applies a force to the valve plug 52 through the through-hole 5111 to keep the valve plug 52 against the first valve mouth part 10a. At this time, the valve plug hole is not connected with the inlet channel 11 and the through-hole 5111.

[0023] The present application provides a solenoid valve, including a core assembly, the core assembly including a movable iron core and a valve plug, the movable iron core including a base portion, a connecting portion, and a sealing portion, the sealing portion protruding from the lower end surface of the base portion, the connecting portion being position-limitingly connected to the valve plug, the valve plug being provided with a valve plug channel penetrating the upper and lower surfaces thereof, the valve plug including a sealing surface portion, the sealing portion being capable of abutting against the sealing surface portion to form a sealing mating portion;

[0024] The solenoid valve is defined as being provided with a reference projection surface perpendicular to the axis of the core assembly 50. In the valve closed state, the sealing portion 5112 abuts against the sealing surface portion 525 of the valve plug, and the second sealing surface portion 524 of the valve plug abuts against the first valve mouth portion 10a. The sealing portion 5112 abuts against the sealing surface portion 525 to form a sealing fitting portion. The sealing fitting portion is defined as forming a first projection area Q1 on the reference projection surface, and the valve plug channel 521 forms a second projection area Q2 on the reference projection surface, wherein there is no overlapping area between the first projection area Q1 and the second projection area Q2. The portion of the valve plug 52 located between the sealing fitting portion and the valve plug channel 521 has a third projection area Q3 on the reference projection surface, wherein the third projection area Q3 is located between the first projection area Q1 and the second projection area Q2. In the background technology, one-piece injection molding is usually used for valve plug processing. In the injection molding process, burrs will be generated around the through holes of the sealing block, or it is easy to overlap due to injection cooling. The edge of the through hole is deformed into convex or concave, and poor leakage is likely to occur at the small valve mouth in the fully closed state. Through the above design, the second projection area Q2 corresponding to the sealing fitting part is separated from the first projection area Q1 corresponding to the valve plug channel by the third projection area Q3. During the valve plug injection molding process, even if burrs are generated or deformation occurs due to cooling injection molding, the edge of the valve plug channel corresponding to the first projection area Q1 will not affect the position of the second projection area Q2 corresponding to the sealing fitting part, that is, the sealing part of the moving iron core is against the sealing surface part of the valve plug. The setting position of the second projection area corresponding to the sealing fitting part is avoided by the third projection area corresponding to part of the valve plug and the first projection area corresponding to the valve plug channel, so as to avoid the position of the edge of the valve plug channel, thereby greatly reducing the influence of burrs around the valve plug through hole or deformation due to injection molding cooling during the valve plug injection molding process, and can relatively guarantee the sealing fit between the moving core and the valve plug.

[0025] It should be noted that the directional nouns such as "inside" and "outside" or ordinal numbers such as "first" and "second" mentioned in this article are all based on the drawings in the specification and are introduced for the convenience of description; it does not mean any limitation on any order of the components. The solenoid valve provided by the relevant technical solution is introduced in detail above, and specific embodiments are used in this article for explanation. The description of the above embodiments is only used to help understand the method of the present invention and its core idea, and does not impose any form of limitation on the present invention.

Claims

1. A solenoid valve, characterized in that: The core assembly includes a moving iron core and a valve plug. The moving iron core includes a base portion, a connecting portion and a sealing portion. The sealing portion protrudes from the lower end surface of the base portion. The connecting portion is limitedly connected with the valve plug. The valve plug is provided with a valve plug channel penetrating the upper and lower surfaces of the valve plug. The valve plug includes a sealing surface portion. The sealing portion can abut against the sealing surface portion to form a sealing matching portion. The solenoid valve is defined as being provided with a reference projection plane perpendicular to the axis of the core assembly, the sealing fitting portion has a first projection area on the reference projection plane, the valve plug channel has a second projection area on the reference projection plane, and the portion of the valve plug located between the sealing fitting portion and the valve plug channel has a third projection area on the reference projection plane, wherein the third projection area is located between the first projection area and the second projection area.

2. The solenoid valve according to claim 1, characterized in that: The sealing portion is provided with a conical groove sunken inward from the surface of the sealing portion, and the diameter of the conical groove is defined as D1, and the diameter of the valve plug channel is defined as D2, wherein 1.2D2<D1<3D2.

3. The solenoid valve according to claim 1, characterized in that: The valve plug includes a small diameter portion, a large diameter portion and a conical surface portion, the large diameter portion is located between the small diameter portion and the conical surface portion, the solenoid valve includes a valve body, the valve body is provided with a first valve port portion, and the valve plug is provided with a second sealing surface portion, the second sealing surface portion can abut against or be away from the first valve port portion.

4. The solenoid valve according to claim 3, characterized in that: The connecting portion includes a peripheral wall portion and a limiting portion, wherein the limiting portion is radially extended inward from the peripheral wall portion, and a step portion is formed on the lower end surface portion of the large diameter portion, and the limiting portion can abut against the step portion.

5. The solenoid valve according to claim 4, characterized in that: The inner diameter of the peripheral wall portion is defined as D5, and the diameter of the large diameter portion is defined as D6, wherein D1-D2>D5-D6.

6. The solenoid valve according to claim 5, characterized in that: Among them, 0.1mm≤(D5-D6)≤0.3mm.

7. The solenoid valve according to any one of claims 1 to 6, characterized in that: The sealing surface portion is a planar structure, the sealing portion includes a planar portion, the planar portion can abut against the sealing surface portion, and the sealing portion is provided with a rounded corner portion.

8. The solenoid valve according to any one of claims 1 to 6, characterized in that: The valve plug is made of elastic TPU material.

9. The solenoid valve according to any one of claims 1 to 6, characterized in that: The valve body comprises a valve body, the valve body is provided with an inlet channel, an outlet channel and a valve port channel, the base portion is provided with a through hole, the through hole passes through the upper and lower surfaces of the base body, the valve body comprises a first valve port portion, the valve plug comprises a second sealing surface portion, when in a valve closed state, the sealing portion abuts against the sealing surface portion, the second sealing surface portion abuts against the first valve port portion, and the valve plug hole is not connected with the inlet channel and the through hole; When the valve is in an open state, the sealing portion is away from the sealing surface portion, the second sealing surface portion is away from the first valve port portion, and the inlet channel, the through hole, the valve plug hole, the valve port hole and the outlet hole are connected.

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