Solenoid valve

Abstract

The solenoid valve has a sealing engagement portion having a first projection region (Q1) on a reference projection plane, a valve plug hole (521) having a second projection region (Q2) on a reference projection plane, and a portion of the valve plug (52) located between the sealing engagement portion and the valve plug hole (521) having a third projection region (Q3) on the reference projection plane, the third projection region (Q3) being located between the first projection region (Q1) and the second projection region (Q2), and when the movable core (51) and the valve plug (52) are sealed-engaged, the sealing engagement portion avoids the position of the valve plug hole (521) and relatively ensures the sealed engagement between the movable core (51) and the valve plug (52).

Description

Technical Field

[0001] This application claims the priority of a Chinese patent application filed with the China National Intellectual Property Administration on September 27, 2023, with the application number 202311255775.9 and the application title "Solenoid Valve", and all its contents are incorporated herein by reference and combined with this application. The present invention relates to the technical field of electric control, and particularly to solenoid valves.

Background Art

[0002] As an electric control device, a solenoid valve is usually applied to a pneumatic spinning machine and includes a fixed core, a movable core unit, a sleeve, and a valve body. The valve body is provided with a large valve port. The movable core unit includes a movable core and a seal block. The seal block can be close to or away from the large valve port. The seal block is provided with via holes penetrating its upper and lower surfaces, and these via holes are installed corresponding to the movable core. Here, when the seal block abuts against the movable core, since the via holes are integrally injection-molded by the seal block, burrs are generated at the edges of the via holes of the seal block adopting the injection molding process, or convex or concave deformations are likely to occur at the right-angle edges of the via holes due to injection molding cooling, and there is a risk of leakage at the small valve port. For those skilled in the art, it is necessary to ensure the sealing reliability between the movable core and the seal block as much as possible.

Summary of the Invention

Problems to be Solved by the Invention

[0003] An object of the present invention is to provide a solenoid valve that can relatively ensure the sealing engagement between a movable core and a seal block.

Means for Solving the Problems

[0004] Embodiments of the present invention provide a solenoid valve comprising a core unit, the core unit comprising a movable core and a valve plug, the movable core comprising a base portion, a connecting portion and a sealing portion, the sealing portion extending outward from the lower end surface of the base portion, the connecting portion connected to the valve plug so as to be position-restricted, the valve plug having a valve plug passage through its upper and lower surfaces, the valve plug comprising a sealing surface portion, the sealing portion being capable of contacting the sealing surface portion to form a sealing engagement portion, the solenoid valve is defined as having a reference projection plane perpendicular to the axis of the core unit, the sealing engagement portion having a first projection region on the reference projection plane, the valve plug passage having a second projection region on the reference projection plane, a portion of the valve plug located between the sealing engagement portion and the valve plug passage having a third projection region on the reference projection plane, the third projection region located between the first projection region and the second projection region.

[0005] Through optimized design of the solenoid valve structure, the sealing engagement portion has a first projection region on the reference projection plane, the valve plug passage has a second projection region on the reference projection plane, and a portion of the valve plug located between the sealing engagement portion and the valve plug passage has a third projection region on the reference projection plane, with the third projection region located between the first and second projection regions. As a result, when the movable core and the valve plug engage in a sealed manner, the sealing portion of the movable core abuts against the sealing surface of the valve plug, and the position of the second projection region corresponding to the sealed engagement portion is separated from the first region corresponding to the valve plug hole by a third projection region corresponding to a part of the valve plug, thereby avoiding the position of the edge of the valve plug hole. This significantly reduces the influence of burrs around the via hole of the valve plug during the injection molding process of the valve plug, or the influence of deformation due to injection molding cooling, and relatively ensures the sealed engagement between the movable core and the valve plug. [Brief explanation of the drawing]

[0006] [Figure 1] This is an overall diagram of the solenoid valve provided by the present invention. [Figure 2] Figure 1 is a cross-sectional view of the core unit. [Figure 3] This is a cross-sectional view of the movable core provided by the present invention. [Figure 4] This is a cross-sectional view of the valve plug provided by the present invention. [Figure 5] This is a projection view of the valve plug and sealing portion of a solenoid valve in the closed state provided by the present invention, on a reference projection plane. [Modes for carrying out the invention]

[0007] To better understand the present invention, the invention will be described in more detail below with reference to the drawings and examples.

[0008] The present invention focuses on optimizing and improving the engagement structure between the movable core of the core unit and the valve plug, wherein the sealing engagement portion has a first projection region on the reference projection plane, the valve plug hole has a second projection region on the reference projection plane, and a portion of the valve plug located between the sealing engagement portion and the valve plug hole has a third projection region on the reference projection plane, with the third projection region located between the first and second projection regions. As a result, when the movable core and the valve plug engage in a sealed manner, the sealing portion of the movable core abuts against the sealing surface of the valve plug, and the position of the second projection region corresponding to the sealed engagement portion is separated from the first region corresponding to the valve plug hole by a third projection region corresponding to a part of the valve plug, thereby avoiding the position of the edge of the valve plug hole. This significantly reduces the influence of burrs around the via hole of the valve plug during the injection molding process of the valve plug, or the influence of deformation due to injection molding cooling, and relatively ensures the sealed engagement between the movable core and the valve plug. Other components, such as the fixed core and valve body, can be adaptively improved according to the operating environment or design.

[0009] Referring to Figures 1 to 4, an overall cross-sectional view of the electronic valve is shown, including the valve body 10, the thread 20, the sleeve 30, the fixed core 40, and the core unit 50. The valve body 10 is provided with a first valve opening 10a, an inlet passage 11, an outlet passage 12, and a valve opening hole 14, and the screw 20 includes a female screw portion 21 and a pressing portion 22. Furthermore, the valve body is provided with a male threaded portion 13 and a groove, and the female threaded portion 21 and the male threaded portion 13 are screwed together and tightened, the sealing component 70 is positioned within the groove of the valve body, and the sleeve 30 includes a main body portion 31 and a burring portion 32. One side of the main body 31 is welded to the fixed core 40, and the burring portion 32 is installed so as to burr outward in the circumferential direction from the other side of the main body 31. Due to the screw tightening engagement between the screw 20 and the valve body 10, one side of the burring portion 32 abuts against the pressing portion 22 and the other side abuts against the sealing component 70, forming a sealing engagement. The core unit 50 includes a movable core 51, a valve plug 52, and a gasket 53, and an elastic component 60 is provided between the fixed core 40 and the movable core 51. The movable core 51 is provided with through-holes 5111 that penetrate its upper and lower surfaces, and the through-holes 5111 include vertical and inclined holes, and the movable core 51 includes a base portion 511, a connecting portion 512, and a sealing portion 5112. Furthermore, the base portion 511 and the connecting portion 512 can be an integrated structure, the connecting portion 512 extends outward from the circumferential direction of the base portion 511, the sealing portion 5112 extends downward from the lower end surface of the base portion 511, the connecting portion 512 is connected to the valve plug 52 in a position-restricted manner, and the connecting portion 512 includes a circumferential wall portion, a position-restricting portion 5121, and a support portion 5122. Furthermore, the position limiting portion 5121 extends radially inward from the peripheral wall portion, the gasket 53 is fitted onto the base portion and supported by the support portion 5122, and the valve plug 52 includes the second valve opening portion 52a and is provided with a valve plug passage 521 that penetrates its upper and lower surfaces. Furthermore, the valve plug passage 521 is a nearly equal-diameter straight-hole passage structure, and at least a portion of the right-angle portion corresponding to the valve plug passage 521 forms a second valve opening 52a, and the valve plug 52 includes a large-diameter portion, a small-diameter portion and a conical surface portion, the large-diameter portion is located between the small-diameter portion and the conical surface portion, a stepped portion 522 is formed between the large-diameter portion and the small-diameter portion, and the valve plug 52 further includes a sealing surface portion 525 and a second sealing surface portion 524. Furthermore, the sealing surface portion 525 and the second sealing surface portion 524 are located on different sides of the valve plug, the stepped portion 522 can abut against the position limiting portion 5121, and the sealing portion 5112 can abut against or be separated from the sealing surface portion. Based on Figures 5 and 1 to 4, it is defined that the solenoid valve is provided with a reference projection plane perpendicular to the axis of the core unit 50. In the closed state, the sealing portion 5112 abuts against the sealing surface portion 525 of the valve plug, the second sealing surface portion 524 of the valve plug abuts against the first valve opening portion 10a, and the sealing portion 5112 abuts against the sealing surface portion 525 to form a sealing engagement portion. The sealing engagement portion refers to a contact engagement surface formed so that, in the closed valve state, both the sealing portion 5112 and the sealing surface portion 525 of the valve plug abut and engage. The sealing engagement portion has a first projection region Q1 formed on the reference projection plane, and the valve plug hole 521 has a second projection region Q2 formed on the reference projection plane. There is no overlapping region between the first projection region Q1 and the second projection region Q2. A portion of the valve plug 52 located between the sealing engagement portion and the valve plug hole 521 has a third projection region Q3 on the reference projection plane, and the third projection region Q3 is located between the first projection region Q1 and the second projection region Q2. In the background art, when manufacturing valve plugs, integral injection molding is usually employed. This process often results in burrs forming around the via holes of the seal block during the injection molding process, or convex or concave deformations occurring at the edges of the via holes due to injection molding cooling. In the fully closed state, this can easily lead to a defect where the valve leaks into the small valve opening. With the above design, the second projection area Q2 corresponding to the sealing engagement part is separated from the first projection area Q1 corresponding to the valve plug hole passage by the third projection area Q3. The edge part of the valve plug hole passage corresponding to the first projection area Q1 will not affect the position where the second projection area Q2 corresponding to the sealing engagement part is located, even if burrs occur or deformation occurs due to cooling injection molding during the injection molding process of the valve plug. That is, the sealing part of the movable core abuts against the sealing surface part of the valve plug, and the installation position of the second projection area corresponding to the sealing engagement part is avoided from the first area projection area corresponding to the valve plug hole passage by the third projection area corresponding to a part of the valve plug, avoiding the position of the edge of the valve plug hole passage, and greatly reducing the influence on the periphery of the via hole of the valve plug from burrs or the influence caused by deformation due to injection molding cooling during the injection molding process of the valve plug, and relatively ensuring the sealing engagement between the movable core and the valve plug.

[0010] Specifically, a part of the valve plug 52 located between the sealing engagement part and the valve plug hole passage 521 has a third projection area Q3 on the reference projection plane. <​​​​​​And this flat surface portion can abut and engage with a flat sealing surface portion so as to achieve a better sealing engagement between the movable core and the valve plug. Note that the sealing portion may include an arcuate portion and may be installed so as to achieve abutting and engaging with a flat sealing surface portion. Alternatively, the flat surface portion of the sealing portion may abut and engage with a sealing surface portion having an arcuate structure, and it is only necessary to achieve sealing between the two. There is no limitation on the structure of the sealing surface portion and the specific structure of the sealing portion for achieving engagement with the sealing surface portion. The valve plug 52 can adopt an elastic TPU material, has high elasticity, high cushioning property, and high wear resistance, and is more suitable for application to a high-frequency electromagnetic valve. Define the aperture of the position-limiting portion as D3, the diameter of the conical surface portion of the valve plug 52 on the side away from the large-diameter portion as D4, and the diameter of the large-diameter portion as D6. When connecting and attaching the movable core and the valve plug so as to limit their positions, the valve plug can be more conveniently incorporated into the connecting portion by the installation of the conical surface portion. And there is a gap between the peripheral wall portion of the connecting portion 521 and the large-diameter portion, and 0.1mm ≤ D5 - D6 ≤ 0.3mm. This can ensure that the valve plug moves relatively flexibly within the connecting portion, and does not cause a bad situation where the gap between the valve plug and the movable core is too large and it can move horizontally and leak. In the closed valve state, when the valve plug is displaced horizontally within the connecting portion, the sealing engagement portion always avoids the position of the valve plug hole 521, so as to ensure the sealing engagement between the movable core and the valve plug. Therefore, D5 - D6 < D1 - D2 can be set.

[0011] The following describes the operating principle of the electromagnetic valve. A coil member is externally inserted into the outer peripheral portion of the sleeve 30. When this coil member is energized, due to the excitation action of the coil member, the movable core 51 moves upward in the axial direction toward the fixed core 40, the elastic component 60 is compressed, and the sealing portion 5112 is released from the state of abutting and engaging with the sealing surface portion 525. As the sealing portion 5112 separates from the sealing surface, the gas pressure accumulated in the through-hole passage 5111 at the moment of valve opening, and the gas pressure between the fixed core 40 and the movable core 51 located above the through-hole passage 5111, are rapidly discharged out of the outlet passage 12 through the valve plug passage 521 and the valve port passage 14. The movable core 51 continues to move upward until the position limiting portion 5121 contacts the stepped portion 522, and the movable core 51 acts upward together with the valve plug 52, causing the valve plug 52 to move away from the first valve port 10a, which is opened, and the solenoid valve is in the fully open position when the gasket 53 contacts the burring portion 32. In this case, the inlet passage 11, the through-hole passage 5111, the valve plug passage 521, the valve port passage 14, and the outlet passage 12 are in communication. When the coil member is de-energized, the excitation of the coil member decreases and the restoring force of the elastic component 60 causes the valve plug 52 to contact the first valve port 10a, and the sealing portion 5112 to contact the sealing surface portion 525. In this case, the position limiting portion 5121 moves away from the stepped portion 522, and the gasket 53 moves away from the burring portion 32. The gas pressure in the inlet passage 11 applies a force to the valve plug 52 via the through-hole passage 5111, causing the valve plug 52 to maintain contact with the first valve port 10a. In this case, the valve plug passage does not communicate with the inlet passage 11 and the through-hole passage 5111.

[0012] The present invention provides a solenoid valve, which includes a core unit. The core unit includes a movable core and a valve plug, and the movable core includes a base, a connecting part and a sealing part. Furthermore, this sealing portion extends protruding from the lower end surface of the base portion, and the connecting portion is connected so as to be limited in position by the valve plug, which is provided with a valve plug hole passage that penetrates its upper and lower surfaces, and the valve plug includes a sealing surface portion. Furthermore, this sealing portion can contact the sealing surface to form a sealing engagement portion. It is defined that the solenoid valve is provided with a reference projection plane perpendicular to the axis of the core unit 50. In the valve closed state, the sealing portion 5112 abuts against the sealing surface portion 525 of the valve plug. The second sealing surface portion 524 of this 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 engagement portion. A first projection region Q1 is formed on the reference projection plane for this sealing engagement portion, and a second projection region Q2 is formed on the reference projection plane for the valve plug hole path 521. There is no overlapping region between the first projection region Q1 and the second projection region Q2. A part of the valve plug 52 located between the sealing engagement portion and the valve plug hole path 521 has a third projection region Q3 on the reference projection plane. It is defined that this third projection region Q3 is located between the first projection region Q1 and the second projection region Q2. In the background art, during the processing of the valve plug, integral injection molding is usually adopted, burrs are generated around the via holes of the seal block in the injection molding process, or convex or concave deformations are likely to occur at the edge portions of the via holes due to injection molding cooling. In the fully closed state, a defective situation of leakage to the small valve port is likely to occur. According to the above design, the second projection region Q2 corresponding to the sealing engagement portion is separated from the first projection region Q1 corresponding to the valve plug hole path by the third projection region Q3. And even if burrs are generated or deformation occurs due to cooling injection molding at the edge portion of the valve plug hole path corresponding to this first projection region Q1 during the injection molding process of the valve plug, it does not affect the position where the second projection region Q2 corresponding to the sealing engagement portion is located. That is, the sealing portion of the movable core abuts against the sealing surface portion of the valve plug. The installation position of the second projection region corresponding to the sealing engagement portion is avoided from the first region projection region corresponding to the valve plug hole path by the third projection region corresponding to a part of the valve plug, avoiding the position of the edge of the valve plug hole path, and greatly reducing the influence received from burrs around the via hole of the valve plug or the influence caused by deformation due to injection molding cooling during the injection molding process of the valve plug, and relatively ensuring the sealing engagement property between the movable core and the valve plug.

[0013] In addition, among the terms related to orientation such as inside and outside, or ordinal numbers such as "first" and "second" mentioned in this specification, they are all introduced for the convenience of explanation based on the drawings of the specification, and do not mean any limitation on the order of any members. The above has introduced the related solenoid valve in detail. In this specification, specific embodiments are used for explanation. However, the explanation of the above embodiments is only for the purpose of understanding the method of the present invention and its core idea, and does not impose any form of limitation on the present invention.

Explanation of Reference Signs

[0014] 10 ··· Valve body 10a ··· First valve port 11 ··· Inlet passage 12 ··· Outlet passage 13 ··· Male thread portion 14 ··· Valve port hole passage 20 ··· Screw 21 ··· Female thread portion 22 ··· Pressing portion 30 ··· Sleeve 31 ··· Body portion 32 ··· Burring portion [[ID=3​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​Q3 ··· The third projection domain.

Claims

1. A solenoid valve, including a core unit, The core unit includes a movable core and a valve plug. The movable core includes a base portion, a connecting portion, and a sealing portion. The sealing portion extends outward from the lower end surface of the base portion, The aforementioned connection portion is connected to the valve plug so as to be limited in position, The valve plug is provided with a valve plug hole passage that penetrates its upper and lower surfaces. The valve plug includes a sealing surface portion, The sealing portion can abut against the sealing surface to form a sealing engagement portion. The solenoid valve is defined as having a reference projection plane perpendicular to the axis of the core unit, The sealing engagement portion has a first projection region on the reference projection plane, The valve plug hole passage has a second projection region on the reference projection plane, A portion of the valve plug located between the sealing engagement portion and the valve plug hole passage has a third projection region on the reference projection plane. The solenoid valve is characterized in that the third projection region is located between the first projection region and the second projection region.

2. The sealing portion is provided with a tapered groove that is recessed inward from the surface of the sealing portion. The diameter of the tapered groove is defined as D1, and the diameter of the valve plug hole is defined as D2.

1. The solenoid valve according to claim 1, characterized in that 1.2D2 < D1 < 3D2.

3. 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, The valve plug is provided with a second sealing surface. The solenoid valve according to claim 1, characterized in that the second sealing surface portion can contact the first valve opening portion or move away from the first valve opening portion.

4. The aforementioned connecting portion includes a peripheral wall portion and a position limiting portion. The position limiting portion is installed so as to extend radially inward from the peripheral wall portion, The lower end surface of the large diameter portion forms a stepped portion. The solenoid valve according to claim 3, characterized in that the position limiting portion is capable of contacting the stepped portion.

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

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

7. The sealing surface portion has a planar structure, The sealing portion includes a flat portion, The flat portion is capable of contacting the sealing surface portion. The solenoid valve according to any one of claims 1 to 6, characterized in that the sealing portion is provided with a fillet 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. Including the valve body, The valve body is provided with an inlet passage, an outlet passage, and a valve opening passage. The base portion is provided with a through-hole, The aforementioned through-hole passes through the upper and lower surfaces of the base portion, The valve body includes a first valve port, The valve plug includes a second sealing surface portion, In the closed state, the sealing portion abuts against the sealing surface, the second sealing surface abuts against the first valve opening, and the valve plug hole does not communicate with the inlet passage or the through hole. The solenoid valve according to any one of claims 1 to 6, characterized in that, when the valve is open, the sealing portion is separated from the sealing surface portion, the second sealing surface portion is separated from the first valve opening portion, and the inlet passage, the through-hole passage, the valve plug passage, the valve opening passage, and the outlet passage are in communication.

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