Axial-flow type check valve

Abstract

The utility model discloses an axial-flow type check valve which comprises a valve body, an inlet end and an outlet end are formed in the valve body, a support is arranged in the valve body, a shaft rod and a spring clamped between the shaft rod and the support are arranged on the support in a telescopic mode, and a valve clack is hinged to the side, facing the inlet end of the valve body, of the shaft rod. A mounting step is arranged on the side, located on the valve clack, of the valve body, a clamping assembly is arranged on the mounting step in a sliding mode, the clamping assembly comprises a left sliding base, right sliding bases arranged symmetrically and a plurality of elastic pieces, the left sliding base and the right sliding bases are clamped to the two sides of the valve clack respectively, and the elastic pieces are arranged between the left sliding base and the valve body and between the right sliding bases and the valve body respectively in a clamped mode; according to the axial flow type check valve, the water hammer phenomenon of the valve is avoided, and the service life of the valve is prolonged.

Description

Technical Field

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

[0002] Axial flow check valves have the characteristics of low pressure drop, rapid opening and closing, timely dynamic response, and low noise. They are mainly used for the outlets of key equipment such as pumps and compressors, and are widely used in long-distance pipelines, petrochemicals, storage facilities, LNG (liquefied natural gas) receiving stations and other industries. In the existing technology, the check valve uses the medium pressure to move the valve disc to open the flow channel; during the fluid transportation process, the sudden opening or closing of the valve causes a sudden change in flow rate, and the pressure fluctuates greatly, which will cause water hammer, which can easily cause damage to the valve body and valve disc and reduce the sealing performance. Utility Model Content

[0003] The purpose of the utility model is to provide an axial flow check valve, which can avoid water hammer phenomenon in the valve and increase the service life of the valve.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: an axial flow check valve, comprising a valve body, an inlet end and an outlet end being provided on the valve body, a bracket being provided in the valve body, a shaft rod and a spring clamped between the shaft rod and the bracket being telescopically provided on the bracket, a valve disc being hingedly provided on the shaft rod toward the side of the valve body inlet end, a mounting step being provided on one side of the valve disc of the valve body, a clamping assembly being slidably provided on the mounting step, the clamping assembly comprising a left slide seat, a symmetrically arranged right slide seat and a plurality of elastic members, the left slide seat and the right slide seat being respectively clamped on both sides of the valve disc, elastic members being clamped between the left slide seat and the right slide seat and the valve body respectively, and the left slide seat and the right slide seat being respectively limited to the valve body by bolts.

[0005] Preferably, an abutment portion and an extension portion are provided on the left sliding seat, one side of the abutment portion is tightly arranged on the valve disc, and the extension portion is connected to the abutment portion in an L-shape and extends toward the side away from the valve disc. A sliding opening is provided in the middle of the extension portion, and a mounting hole is provided on the side of the valve body corresponding to the sliding opening, and the bolts pass through the sliding opening in sequence and are tightened in the mounting hole.

[0006] Preferably, the abutment portion faces one side of the valve body and is provided with a plurality of positioning protrusions, the valve body is provided with a telescopic hole for embedding the elastic member, one end of the elastic member is sleeved on the positioning protrusion, and the other end is tightly arranged in the telescopic hole.

[0007] Preferably, sliding feet are provided on both sides of the extension portion, one end of the sliding foot is connected to the extension portion, and the other end protrudes toward one side of the valve body, and a sliding groove adapted to the sliding foot is provided on the valve body.

[0008] Preferably, a first inclined surface and a second inclined surface are respectively provided on the inner circumferential surface of the left sliding seat and the right sliding seat on the side facing the valve disc, and the first inclined surface and the second inclined surface are arranged in a gradually expanding state toward the outlet end.

[0009] Preferably, the first inclined surface and the second inclined surface are respectively provided with a first chamfered surface and a second chamfered surface on the side facing the outlet end.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows: when the valve disc is subjected to fluid pressure at the inlet end, the left slide and the right slide are squeezed to slide to both sides to make way, so that the valve is opened and the pressure shock is reduced; when the fluid decreases, the valve disc uses the spring to restore the operation and presses against the left slide and the right slide, so that the left slide and the right slide slide to both sides to make way, reducing the sudden change in flow rate caused by the sudden opening or closing of the valve, so that the valve disc can be opened and closed smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0012] Figure 2 It is a partial cross-sectional view of the valve body, valve disc and clamping assembly of the utility model;

[0013] Figure 3 This is an enlarged view of part A of the utility model;

[0014] Figure 4 This is a schematic diagram of the installation step structure of the valve body of the utility model.

[0015] In the figure: 1. Valve body; 2. Inlet end; 3. Outlet end; 4. Bracket; 5. Shaft; 8. Spring; 9. Valve disc; 10. Mounting step; 11. Clamping assembly; 12. Left slide; 13. Right slide; 14. Elastic member; 15. Bolt; 16. Abutment portion; 17. Extension portion; 18. Sliding opening; 19. Mounting hole; 20. Positioning protrusion; 21. Telescopic hole; 23. Sliding foot; 24. Slide groove; 25. First inclined surface; 26. Second inclined surface; 27. First chamfered surface; 28. Second chamfered surface. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0017] Example: As shown in the attached Figures 1 to 4The axial flow check valve shown in the figure includes a valve body 1, which is provided with an inlet end 2 and an outlet end 3. A bracket 4 is provided in the valve body 1, and a shaft 5 and a spring 8 clamped between the shaft 5 and the bracket 4 are telescopically provided on the bracket 4. The shaft 5 is hingedly provided with a valve disc 9 on the side of the inlet end 2 of the valve body 1. The valve body 1 is provided with a mounting step 10 on one side of the valve disc 9. A clamping assembly 11 is slidably provided on the mounting step 10. The clamping assembly 11 includes a left slide 12, a symmetrically arranged right slide 13 and a plurality of elastic members 14. The left slide 12 and the right slide 13 are respectively clamped on both sides of the valve disc 9 , elastic members 14 are respectively sandwiched between the left slide 12 and the right slide 13 and the valve body 1, and the left slide 12 and the right slide 13 are respectively limited and set on the valve body 1 by bolts 15. When the valve disc 9 is subjected to the fluid pressure of the inlet end 2, the left slide 12 and the right slide 13 are squeezed to slide to both sides to make way, so that the valve is opened and the pressure shock is reduced. When the fluid is reduced, the valve disc 9 uses the spring 8 to restore the operation and press against the left slide 12 and the right slide 13, so that the left slide 12 and the right slide 13 slide to both sides to make way, reducing the sudden change in flow rate due to the sudden opening or closing of the valve, so that the valve disc 9 can be opened and closed smoothly.

[0018] As attached Figure 3 As shown, the left slide 12 is provided with an abutment portion 16 and an extension portion 17, one side of the abutment portion 16 is tightly arranged on the valve disc 9, and the extension portion 17 is connected to the abutment portion 16 in an L-shape and extends toward the side away from the valve disc 9, a sliding opening 18 is provided in the middle of the extension portion 17, and a mounting hole 19 is provided on the valve body 1 on a side corresponding to the sliding opening 18, the bolts 15 pass through the sliding opening 18 in sequence and are tightened in the mounting hole 19, the bolts 15 are used to form a positioning support for the left slide 12, and the sliding opening 18 is provided for the left slide 12 to slide, which plays a role in making way (the right slide 13 adopts the same mounting structure).

[0019] As attached Figure 2 As shown, the abutment 16 faces one side of the valve body 1 and is provided with a plurality of positioning protrusions 20 (specifically, two are provided, which are respectively located on both sides of the abutment 16 and are an integrated structure). The valve body 1 is provided with a telescopic hole 21 for embedding the elastic member 14 (specifically, the pressure spring 8). One end of the elastic member 14 is sleeved on the positioning protrusion 20, and the other end is tightly arranged in the telescopic hole 21. The positioning portion is used to position and support the elastic member 14, which can prevent the elastic member 14 from deformation and distortion.

[0020] As attached Figure 2As shown, sliding legs 23 are provided on both sides of the extension portion 17 (respectively provided on one side of the two positioning protrusions 20, and are an integral structure with the extension portion 17). One end of the sliding leg 23 is connected to the extension portion 17, and the other end protrudes toward one side of the valve body 1. A sliding groove 24 adapted to the sliding leg 23 is provided on the valve body 1 (the length of the sliding leg 23 is shorter than the length of the sliding groove 24). The provision of the sliding legs 23 can improve the stability of the left slide 12 and the right slide 13 during operation.

[0021] As attached Figure 1 As shown, a first inclined surface 25 and a second inclined surface 26 are respectively provided on the inner circumferential surface of the left slide 12 and the right slide 13 facing the valve disc 9. The first inclined surface 25 and the second inclined surface 26 are arranged in a gradually expanding state toward the outlet end 3. When the valve disc 9 is in the open state, the first inclined surface 25 and the second inclined surface 26 can reduce a certain amount of resistance, and the inclined surface design can reduce wear. When the valve disc 9 is in the closed state and abuts against the first inclined surface 25 and the second inclined surface 26, it can avoid the situation where the structures are stuck during impact.

[0022] As attached Figure 1 As shown, the first inclined surface 25 and the second inclined surface 26 are respectively provided with a first chamfered surface 27 and a second chamfered surface 28 on the side facing the outlet end 3 , which can reduce the wear of the valve flap 9 and improve the sealing performance and service life of the valve flap 9 .

[0023] In the present invention, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are merely relational words determined 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 a limitation on the present invention.

Claims

1. An axial flow check valve, comprising a valve body (1), the valve body (1) being provided with an inlet end (2) and an outlet end (3), a bracket (4) being provided in the valve body (1), a shaft (5) being telescopically provided on the bracket (4) and a spring (8) being sandwiched between the shaft (5) and the bracket (4), a valve flap (9) being hingedly provided on the shaft (5) toward the inlet end (2) of the valve body (1), and characterized in that: The valve body (1) is provided with an installation step (10) on one side of the valve disc (9), and a clamping assembly (11) is slidably provided on the installation step (10). The clamping assembly (11) includes a left slide seat (12), a symmetrically arranged right slide seat (13) and a plurality of elastic members (14). The left slide seat (12) and the right slide seat (13) are respectively clamped on both sides of the valve disc (9). Elastic members (14) are respectively clamped between the left slide seat (12) and the right slide seat (13) and the valve body (1). The left slide seat (12) and the right slide seat (13) are respectively limited and provided on the valve body (1) by bolts (15).

2. An axial flow check valve according to claim 1, characterized in that: The left sliding seat (12) is provided with an abutting portion (16) and an extending portion (17), one side of the abutting portion (16) is tightly arranged on the valve disc (9), and the extending portion (17) is connected to the abutting portion (16) in an L-shape and extends toward the side away from the valve disc (9), and a sliding opening (18) is provided in the middle of the extending portion (17), and a mounting hole (19) is provided on the side of the valve body (1) corresponding to the sliding opening (18), and the bolts (15) pass through the sliding opening (18) in sequence and are tightened in the mounting hole (19).

3. The axial flow check valve according to claim 2, characterized in that: The abutting portion (16) faces one side of the valve body (1) and is provided with a plurality of positioning protrusions (20). The valve body (1) is provided with a telescopic hole (21) for embedding the elastic member (14). One end of the elastic member (14) is sleeved on the positioning protrusion (20), and the other end is tightly arranged in the telescopic hole (21).

4. The axial flow check valve according to claim 3, characterized in that: Sliding legs (23) are provided on both sides of the extension portion (17), one end of the sliding leg (23) is connected to the extension portion (17), and the other end is protruded toward one side of the valve body (1), and a sliding groove (24) adapted to the sliding leg (23) is provided on the valve body (1).

5. The axial flow check valve according to claim 1, characterized in that: A first inclined surface (25) and a second inclined surface (26) are respectively provided on the inner circumference of the left slide (12) and the right slide (13) on the side facing the valve disc (9), and the first inclined surface (25) and the second inclined surface (26) are arranged in a gradually expanding state toward the side of the outlet end (3).

6. The axial flow check valve according to claim 5, characterized in that: The first inclined surface (25) and the second inclined surface (26) are respectively provided with a first rounded surface (27) and a second rounded surface (28) on the side facing the outlet end (3).

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