Double-clack check valve

Abstract

The utility model discloses a double-clack check valve which comprises a valve body, an annular boss is arranged in the valve body, a blocking rod dividing the annular boss into two semicircular channels is transversely arranged on the annular boss, a left butterfly plate and a right butterfly plate which are in sealing fit with the two semicircular channels are arranged on the valve body in a hinged mode, and a compression spring is arranged on one side of each butterfly plate in a pressing mode. A connecting rod used for being sleeved with a pressure spring is installed on the valve body, a buffering assembly is arranged on the side, facing the hinged end of the left butterfly plate and the right butterfly plate, of the baffle and comprises a sealing base, a plurality of elastic pieces and a plurality of fixing rods, the sealing base is arranged on the baffle rod in a limited mode through the fixing rods, and the elastic pieces are arranged between the sealing base and the baffle rod in a clamped mode. According to the double-clack check valve, friction between the butterfly plates and the blocking rod can be reduced when the butterfly plates are closed and opened, and the service life of the butterfly plates and the service life of the blocking rod are prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, and particularly relates to a double-flap check valve. Background Art

[0002] The double-flap check valve is used for pure pipelines, industrial, environmental protection, water treatment, and water supply and drainage pipelines of high-rise buildings to prevent the reverse flow of media. The check valve adopts a wafer type, the butterfly plate is composed of two semi-circles, and spring forced reset is adopted. The sealing surface can be a body surfacing wear-resistant material or lined with rubber. The butterfly plate opens under the action of fluid pressure, and the fluid flows from the inlet side to the outlet side. When the pressure on the inlet side is lower than that on the outlet side, in the prior art during use, hard friction occurs between the middle parts of the left butterfly plate and the right butterfly plate and the retaining rod on the valve body, resulting in a gradually increasing gap between the left butterfly plate, the right butterfly plate, and the retaining rod, causing fluid leakage through the gap, thereby reducing the service life of the double-flap check valve. Content of the Utility Model

[0003] The purpose of the utility model is to provide a double-flap check valve, which can reduce the friction between the butterfly plate and the retaining rod during closing and opening, and improve the service life of the butterfly plate and the retaining plate.

[0004] To achieve the above purpose, the utility model provides the following technical solution: a double-flap check valve, including a valve body, an annular boss is arranged in the valve body, a retaining rod is transversely arranged on the annular boss to divide the annular boss into two semi-circular channels, a left butterfly plate and a right butterfly plate that form a sealing fit with the two semi-circular channels are hingedly arranged on the valve body, a compression spring is tightly arranged on one side of the butterfly plate, a connecting rod for sleeving the compression spring is installed on the valve body, a buffer assembly is arranged on the retaining plate towards the hinged end side of the left butterfly plate and the right butterfly plate, the buffer assembly includes a sealing base, a plurality of elastic members and a plurality of fixing rods, the sealing base is limited on the retaining rod through the fixing rods, and the elastic members are clamped between the sealing base and the retaining rod, so that the sealing base forms an elastic abutment with the left butterfly plate and the right butterfly plate.

[0005] Preferably, a stud is arranged at one end of the fixing rod, a positioning boss is arranged on the retaining rod towards the sealing base side, a groove adapted thereto is opened on the sealing base, a through hole communicating with the groove is opened on the sealing base, a screw hole corresponding to the through hole is opened on the positioning boss, and the fixing rod passes through the through hole once and is tightened in the screw hole.

[0006] Preferably, sliding grooves are sequentially arranged in an array on both sides of the positioning boss, and sliding parts adapted to the sliding grooves are arranged on the groove.

[0007] Preferably, the sealing base is provided with a plurality of first slots in a transverse array on both sides of the sliding portion, a plurality of second slots are provided on the gear lever corresponding to one side of the first slots, and both ends of the elastic member are tightly arranged on the first slots and the second slots.

[0008] Preferably, a plurality of sealing ribs are symmetrically arranged on both sides of the sealing base and corresponding to the positions of the left butterfly plate and the right butterfly plate, and the sealing ribs are arranged in a semicircular shape toward the left butterfly plate.

[0009] Preferably, the sealing rib is provided with a tapered opening on the side facing the left butterfly plate, and the tapered opening is arranged in a gradually expanding state toward the side facing the left butterfly plate.

[0010] Preferably, a protrusion of the sealing base located between the left butterfly plate and the right butterfly plate is provided with a clamping portion, and two sides of the clamping portion are respectively pressed against the left butterfly plate and the right butterfly plate.

[0011] Preferably, a first clearance gap is provided between the sealing base and the shift rod, and a second clearance gap is provided between the clamping portion and the fixing rod.

[0012] Compared with the prior art, the beneficial effect of the utility model is that when the left butterfly plate and the right butterfly plate are in the open state, they slowly rotate and form abutment with the sealing base. At this time, the sealing base uses the elastic member to shrink downward to form a gap in order to reduce the friction with the left butterfly plate and the right butterfly plate, and the second gap can avoid the sealing base and the gear lever from getting stuck. When the left butterfly plate and the right butterfly plate are closed due to the pressure of the compression spring, the sealing base rises synchronously, and the restoring force is released by the elastic member, so that when the left butterfly plate and the right butterfly plate are completely closed, the sealing base forms a sealing abutment at the same time, and the conical opening on the sealing rib can improve the sealing performance and prevent leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a cross-sectional view of the overall structure of the utility model;

[0014] Figure 2 It is a cross-sectional view of the utility model;

[0015] Figure 3 It is an enlarged view of part A of the utility model.

[0016] In the figure: 1. valve body; 2. annular boss; 3. shift rod; 4. left butterfly plate; 5. right butterfly plate; 8. compression spring; 9. connecting rod; 10. buffer assembly; 11. sealing base; 12. elastic member; 13. fixing rod; 14. stud; 15. positioning boss; 16. groove; 17. through hole; 18. screw hole; 19. slide groove; 20. sliding part; 21. first clamping groove; 23. second clamping groove; 24. sealing rib; 25. conical opening; 26. clamping part; 27. first clearance; 28. second clearance. DETAILED DESCRIPTION

[0017] 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.

[0018] Example: As shown in the attached Figures 1 to 3 A double-flap check valve shown in the figure comprises a valve body 1, wherein an annular boss 2 is arranged inside the valve body 1, and a stop rod 3 (an integrated structure) is transversely arranged on the annular boss 2 for dividing the annular boss 2 into two semicircular channels, and a left butterfly plate 4 and a right butterfly plate 5 are hingedly arranged on the valve body 1 (by installing a valve stem) to form a sealing fit with the two semicircular channels, a compression spring 8 is tightly arranged on one side of the butterfly plate, and a connecting rod 9 (fixed by bolts) for sleeve-mounting the compression spring 8 is installed on the valve body 1, and a buffer assembly 10 is arranged on the side of the hinged end of the stop plate facing the left butterfly plate 4 and the right butterfly plate 5, and the buffer assembly 10 comprises a sealing base 11 (specifically made of rubber material), a plurality of elastic members 12 (eight are arranged and symmetrically arranged) and a plurality of fixing rods 13 (four are arranged in a transverse array), and the sealing base 11 is connected to the fixing rod 1 3 limit is set on the gear lever 3, and the elastic member 12 is clamped between the sealing base 11 and the gear lever 3, so that the sealing base 11 forms an elastic abutment with the left butterfly plate 4 and the right butterfly plate 5. When the left butterfly plate 4 and the right butterfly plate 5 are in the open state, they slowly rotate and form abutment with the sealing base 11. At this time, the sealing base 11 uses the elastic member 12 to shrink downward to form a gap in order to reduce the friction with the left butterfly plate 4 and the right butterfly plate 5, and the second gap 28 can avoid the sealing base 11 and the gear lever 3 from being stuck. When the left butterfly plate 4 and the right butterfly plate 5 are closed by the pressure of the compression spring 8, the sealing base 11 rises synchronously, and the restoring force is released by the elastic member 12, so that when the left butterfly plate 4 and the right butterfly plate 5 are completely closed, the sealing base 11 forms a sealing abutment at the same time, and the tapered opening 25 on the sealing convex rib 24 can improve the sealing performance to prevent leakage.

[0019] As attached Figure 3As shown, one end of the fixed rod 13 is provided with a stud 14 (which is an integral structure). On the side of the retaining rod 3 facing the sealing base 11, a positioning boss 15 (which is an integral structure) is provided. A groove 16 adapted thereto is formed on the sealing base 11. A through hole 17 communicating with the groove 16 is formed on the sealing base 11. A screw hole 18 corresponding to the through hole 17 is formed on the positioning boss 15. The fixed rod 13 passes through the through hole 17 once and is screwed into the screw hole 18. The fixed rod 13 serves to limit and fix the sealing base 11. At the same time, the sealing base 11 performs up and down sliding operations by means of the through hole 17.

[0020] As shown in the attached Figure 3 figure, on both sides of the positioning boss 15, sliding grooves 19 are sequentially arranged in an array. On the groove 16, a sliding part 20 (which is an integral structure) adapted to the sliding grooves 19 is provided, which can improve the smoothness of the sealing base 11 during lifting operations and enhance the stability during lifting operations.

[0021] As shown in the attached Figure 3 figure, on both sides of the sealing base 11 where the sliding part 20 is located, a plurality of first card slots 21 are transversely arranged in an array. On the retaining rod 3, on the side corresponding to the first card slots 21, a plurality of second card slots 23 are provided. Both ends of the elastic member 12 (specifically a compression spring) are respectively abutted and set on the first card slots 21 and the second card slots 23, which plays a role in limiting the elastic member 12 and preventing the elastic member 12 from being distorted during operation.

[0022] As shown in the attached Figure 3 figure, on both sides of the sealing base 11 and at positions corresponding to the left butterfly plate 4 and the right butterfly plate 5, a plurality of sealing ribs 24 (which are integral structures) are symmetrically arranged. The sealing ribs 24 are arranged in a semi-circular shape on the side facing the left butterfly plate 4. The arrangement of a plurality of sealing ribs 24 forms a multi-stage sealing effect and enhances the sealing performance when the left butterfly plate 4 and the right butterfly plate 5 are closed.

[0023] As shown in the attached Figure 3 figure, a tapered opening 25 is formed on the side of the sealing rib 24 facing the left butterfly plate 4. The tapered opening 25 is arranged in a gradually expanding state on the side facing the left butterfly plate 4. The tapered opening 25 formed on the sealing rib 24 is used to increase the sealing contact points, and a sealing cavity is formed in the tapered opening 25 during sealing, increasing the air pressure and making it not easy to leak.

[0024] As shown in the attached Figure 3 figure, a clamping part 26 (which is an integral structure) is provided on the protrusion of the sealing base 11 between the left butterfly plate 4 and the right butterfly plate 5. Both sides of the clamping part 26 are respectively abutted against the left butterfly plate 4 and the right butterfly plate 5, increasing the abutting effect. By pressing the clamping part 26, the sealing force between the sealing base 11 and the left butterfly plate 4 and the right butterfly plate 5 is increased.

[0025] As shown in the attachedFigure 3 As shown, a first clearance 27 is provided between the sealing base 11 and the shift lever 3, and a second clearance 28 is provided between the clamping portion 26 and the fixing rod 13. The first clearance 27 is used for the up and down adjustment of the sealing base 11, and the second clearance 28 is used to control the lifting range of the sealing base 11 on the fixing rod 13.

[0026] In the present utility model, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only relational terms determined for the convenience of describing the structural relationship of each component or element of the present utility model, and do not specifically refer to any component or element in the present utility model, and should not be construed as a limitation to the present utility model.

Claims

1. A double - flap check valve, comprising a valve body (1), wherein an annular boss (2) is arranged inside the valve body (1), a baffle rod (3) which horizontally divides the annular boss (2) into two semi - circular channels is arranged on the annular boss (2), a left butterfly plate (4) and a right butterfly plate (5) which form a sealing fit with the two semi - circular channels are hinged on the valve body (1), a compression spring (8) is tightly arranged on one side of the butterfly plate, and a connecting rod (9) for sleeving the compression spring (8) is installed on the valve body (1), and is characterized in that: The gear lever (3) is provided with a buffer assembly (10) on the side towards the hinged ends of the left butterfly plate (4) and the right butterfly plate (5). The buffer assembly (10) includes a sealing base (11), a plurality of elastic members (12) and a plurality of fixing rods (13). The sealing base (11) is limited on the gear lever (3) through the fixing rods (13). The elastic members (12) are clamped between the sealing base (11) and the gear lever (3), so that the sealing base (11) is elastically abutted against the left butterfly plate (4) and the right butterfly plate (5).

2. The double-flap check valve according to claim 1, characterized in that: One end of the fixing rod (13) is provided with a stud (14). The gear lever (3) is provided with a positioning boss (15) on the side towards the sealing base (11). The sealing base (11) is provided with a groove (16) that is adapted thereto. The sealing base (11) is provided with a through hole (17) that communicates with the groove (16). The positioning boss (15) is provided with a screw hole (18) corresponding to the through hole (17). The fixing rod (13) passes through the through hole (17) once and is screwed into the screw hole (18).

3. The double-flap check valve according to claim 2, wherein: Chute grooves (19) are sequentially arranged in an array on both sides of the positioning boss (15). The groove (16) is provided with a sliding portion (20) that is adapted to the chute grooves (19).

4. A double-flap check valve according to claim 3, characterized in that: A plurality of first clamping grooves (21) are transversely arranged in an array on both sides of the sealing base (11) where the sliding portion (20) is located. A plurality of second clamping grooves (23) are provided on the gear lever (3) on the side corresponding to the first clamping grooves (21). Both ends of the elastic member (12) are respectively abutted and tightened on the first clamping grooves (21) and the second clamping grooves (23).

5. A double-flap check valve according to claim 1, characterized in that: A plurality of sealing ribs (24) are symmetrically arranged on both sides of the sealing base (11) and at positions corresponding to the left butterfly plate (4) and the right butterfly plate (5). The sealing ribs (24) are arranged in a semi-circular shape on the side towards the left butterfly plate (4).

6. The double-flap check valve according to claim 5, characterized in that: A tapered opening (25) is provided on the side of the sealing rib (24) towards the left butterfly plate (4). The tapered opening (25) is arranged in a gradually expanding state on the side towards the left butterfly plate (4).

7. A double - flap check valve according to claim 1, characterized in that: A clamping portion (26) is provided in a protruding manner on the sealing base (11) between the left butterfly plate (4) and the right butterfly plate (5). Both sides of the clamping portion (26) are respectively abutted against the left butterfly plate (4) and the right butterfly plate (5).

8. A double-flap check valve according to claim 7, characterized in that: A first clearance gap (27) is provided between the sealing base (11) and the gear lever (3). A second clearance gap (28) is provided between the clamping portion (26) and the fixing rod (13).

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