Vacuum check valve

Abstract

The utility model discloses a vacuum check valve which comprises a valve body, an inlet end and an outlet end are arranged on the valve body, a valve plate and a pressure spring are sequentially arranged in the valve body, one end of the pressure spring is arranged at the outlet end of the valve body in an abutting mode, and the other end of the pressure spring is connected with the valve plate in an abutting mode and pressed on the inlet end. The valve is characterized in that a plurality of positioning columns are arranged in the valve body in an annular array mode, a sliding assembly in sliding fit with the positioning columns is arranged on the valve plate, the sliding assembly comprises sliding blocks which are arranged in an annular array mode and correspond to the positioning columns, and the valve plate transmits pressure to a pressure spring through the sliding blocks to achieve sliding fit with the positioning columns. The utility model aims to provide the vacuum check valve, which can control the operation strokes of the valve plate and the pressure spring, effectively avoids the problem that the valve plate turns over in the operation process, stabilizes the telescopic stroke of the pressure spring, and improves the sealing property and the practicability of the vacuum check valve.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a vacuum check valve. Background Art

[0002] Each vacuum suction cup of the vacuum holding equipment is generally equipped with a vacuum check valve. When a vacuum suction cup does not suck up the goods, the corresponding air circuit will be checked to avoid damaging the vacuum environment of other vacuum suction cups and reduce the energy consumption of the vacuum generator. The vacuum check valve is mainly composed of an external valve body and an internal valve core. The existing valve core generally has four parts: a valve body, a sealing block, a valve stem and a spring. In the prior art, in order to ensure the sealing inside the valve body and the appearance integrity, an one-piece molding process is usually adopted. During the operation of the vacuum check valve, the dependence on the spring component is extremely high. The pressure stability of the spring is related to the sealing effect of the valve core, and the sealing block and the spring are tightened by torque, resulting in the problem of sealing failure caused by excessive operation frequency during actual use. Utility Model Content

[0003] In view of the above problems, the utility model provides a vacuum check valve.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a vacuum check valve, comprising a valve body, which is provided with an inlet end and an outlet end, and a valve plate and a compression spring are sequentially arranged in the valve body, one end of the compression spring abuts the outlet end arranged on the valve body, and the other end abuts the valve plate and is pressed against the inlet end, a plurality of positioning posts are arranged in an annular array in the valve body, and a sliding assembly that forms a sliding fit with the positioning posts is arranged on the valve plate, the sliding assembly includes sliders arranged in an annular array and corresponding to the positioning posts, and the valve plate utilizes the slider to transfer pressure to the compression spring to achieve a sliding fit with the positioning posts.

[0005] Preferably, an annular inner cavity is opened in the valve body, and a sliding part and a supporting part are provided on the positioning column. The sliding part is vertically arranged on the inner wall of the annular inner cavity, and one end of the supporting part is connected to the sliding part, and the other end extends to the outlet end.

[0006] Preferably, a sliding groove is provided on the sliding portion, the sliding block is slidably arranged in the sliding groove, and a conical surface is designed and arranged on the side of the sliding block facing the supporting portion, and the conical surface is arranged in a gradually shrinking state towards the side of the supporting portion.

[0007] Preferably, four positioning columns are provided, the support portion on the positioning column is provided with an annular through hole, at least one support portion without an annular through hole is retained on the four positioning columns, one end of the compression spring is inserted into the annular through hole, and the other end abuts against the valve plate.

[0008] Preferably, the compression spring is fixed at one end close to the valve plate by welding.

[0009] Preferably, the valve plate is provided with an annular groove on one side facing the inlet end, and an annular sealing ring is embedded in the annular groove.

[0010] Compared with the prior art, the utility model has the following beneficial effects: the valve plate is installed by plugging and installing the slider and the slide groove on the positioning column, one end of the compression spring is plugged and matched with the annular through hole of the support part to form a limit fixation, and the other end is pressed against the valve plate and fixed by welding. When the valve plate receives pressure, the compression spring is squeezed inward and the slider is used to slide, avoiding the problem of the valve plate flipping due to the high pressure on one side, and after the compression spring is fixed at both ends, the contact surface with the valve plate can be more stable, and the bottom is not easy to slide after being plugged in, which has a better limit stabilization effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a cross-sectional view of the overall structure of the utility model;

[0012] Figure 2 It is a schematic diagram of the local structure of the utility model;

[0013] Figure 3 It is an exploded view of the internal structure of the utility model.

[0014] In the figure: 1. valve body; 2. inlet end; 3. outlet end; 4. valve plate; 5. compression spring; 8. positioning column; 9. sliding assembly; 10. slider; 11. annular inner cavity; 12. sliding part; 13. supporting part; 14. slide groove; 15. conical surface; 16. annular through hole; 17. annular groove; 18. annular sealing ring. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] Example: As attached Figures 1 to 3A vacuum check valve shown in the figure comprises a valve body 1, the valve body 1 is provided with an inlet end 2 and an outlet end 3, a valve plate 4 and a compression spring 5 are sequentially arranged in the valve body 1, one end of the compression spring 5 abuts against the outlet end 3 arranged on the valve body 1, and the other end abuts against the valve plate 4 and is pressed against the inlet end 2, a plurality of positioning posts 8 (arranged as an integrated structure) are arranged in an annular array in the valve body 1, a sliding assembly 9 is arranged on the valve plate 4 to form a sliding fit with the positioning posts 8, the sliding assembly 9 comprises a slider 10 (arranged as an integrated structure with the valve plate 4) arranged in an annular array and corresponding to the positioning posts 8, the valve plate 4 is moved by the slider 10 The pressure is transmitted to the compression spring 5 to achieve sliding cooperation with the positioning column 8. When installing, the valve plate 4 is plugged and installed with the slide groove 14 on the positioning column 8 through the slider 10. One end of the compression spring 5 is plugged and cooperated with the annular through hole 16 of the support part 13 to form a limit fixation, and the other end is pressed against the valve plate 4 and fixed by welding. When the valve plate 4 receives pressure, the compression spring 5 is squeezed inward and contracts, and the slider 10 is used to slide to avoid the problem of the valve plate 4 flipping over due to the high pressure on one side. After the compression spring 5 is fixed at both ends, the contact surface with the valve plate 4 can be more stable, and the bottom is not easy to slide after being plugged in, which has a good limit stability effect.

[0017] As attached Figure 3 As shown, an annular inner cavity 11 is opened in the valve body 1, and a sliding portion 12 and a supporting portion 13 (an integrated structure) are provided on the positioning column 8. The sliding portion 12 is vertically arranged on the inner wall of the annular inner cavity 11, and one end of the supporting portion 13 is connected to the sliding portion 12, and the other end extends to the outlet end 3. The sliding portion 12 functions to limit the outer periphery of the compression spring 5 to prevent the compression spring 5 from twisting and deforming outward and stabilize the elasticity of the compression spring 5. The supporting portion 13 provides a better support for the bottom of the compression spring 5.

[0018] As attached Figure 3 As shown, a slide groove 14 is provided on the sliding portion 12, and the slider 10 is slidably arranged in the slide groove 14. The slider 10 is designed with a tapered surface 15 on the side facing the support portion 13. The tapered surface 15 is arranged in a gradually shrinking state toward the side of the support portion 13, which is convenient for the installation of the slider 10 and prevents the valve plate 4 from being stuck with the slide groove 14 when sliding.

[0019] As attached Figure 3 As shown, four positioning posts 8 are provided, and the support portion 13 on the positioning post 8 is provided with an annular through hole 16. At least one support portion 13 without the annular through hole 16 is retained on the four positioning posts 8. One end of the compression spring 5 is inserted into the annular through hole 16, and the other end abuts against the valve plate 4. The purpose of retaining a support portion 13 without a hole is that the end of the compression spring 5 can be tightly pressed against the support portion 13 to prevent the compression spring 5 from loosening.

[0020] As attached Figure 2 As shown, the compression spring 5 is fixed by welding at one end close to the valve plate 4, thereby improving the linkage and stability between the valve plate 4 and the compression spring 5.

[0021] As attached Figure 2 As shown, the valve plate 4 is provided with an annular groove 17 on the side facing the inlet end 2, and an annular sealing ring 18 is embedded in the annular groove 17 to prevent the valve plate 4 from directly colliding with the inlet end 2 and to have a good sealing effect.

[0022] In the present invention, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present invention, and do not specifically refer to any part or element in the present invention and cannot be understood as limitations on the present invention.

Claims

1. A vacuum check valve, comprising a valve body, the valve body being provided with an inlet end and an outlet end, the valve body being provided with a valve plate and a compression spring in sequence, one end of the compression spring abutting against the outlet end provided on the valve body, and the other end abutting against the valve plate and pressing against the inlet end, characterized in that: A plurality of positioning posts are arranged in an annular array in the valve body, a sliding assembly is arranged on the valve plate to form a sliding fit with the positioning posts, the sliding assembly includes sliders arranged in an annular array and corresponding to the positioning posts, and the valve plate uses the slider to transfer pressure to the compression spring to achieve a sliding fit with the positioning posts.

2. A vacuum check valve according to claim 1, characterized in that: An annular inner cavity is provided in the valve body, a sliding portion and a supporting portion are provided on the positioning column, the sliding portion is vertically provided on the inner wall of the annular inner cavity, one end of the supporting portion is connected to the sliding portion, and the other end extends to the outlet end.

3. A vacuum check valve according to claim 2, characterized in that: The sliding part is provided with a sliding groove, the sliding block is slidingly arranged in the sliding groove, and the sliding block is designed to be provided with a tapered surface on the side facing the supporting part, and the tapered surface is arranged in a gradually shrinking state towards the side facing the supporting part.

4. A vacuum check valve according to claim 3, characterized in that: There are four positioning columns, and the support portion on the positioning column is provided with an annular through hole. At least one support portion without an annular through hole is retained on the four positioning columns. One end of the compression spring is inserted into the annular through hole, and the other end abuts against the valve plate.

5. A vacuum check valve according to claim 4, characterized in that: The compression spring is fixed at one end close to the valve plate by welding.

6. A vacuum check valve according to claim 1, characterized in that: The valve plate is provided with an annular groove on one side facing the inlet end, and an annular sealing ring is embedded in the annular groove.

Images