Butt-clamping butterfly check valve

Abstract

The utility model provides a butt-clamping butterfly check valve, which relates to the technical field of check valves and comprises a sleeve, a mounting rod and a support rod are arranged in the sleeve, two valve plates are rotatably connected onto the mounting rod, one ends of the two valve plates, which are far away from each other, are provided with movable grooves, and the movable grooves are connected with the support rod. A limiting assembly is slidably connected to the movable groove, and the valve plate is limited through the limiting assembly, so that when no water flow passes through the sleeve, the valve plate can be closed in a vertical state, and the situation that after a return spring is damaged and inclines, a gap is formed between the sleeve and the valve plate is avoided; the pressure plate slides towards one side under extrusion force, at the moment, the traction rope pulls the limiting protruding block to move downwards, the limiting protruding block is made to return into the movable groove, the clamping state of the limiting protruding block and the limiting groove is removed, the valve plate can be turned over normally, and compared with a traditional butt-clamping butterfly check valve, the practicability of the butt-clamping butterfly check valve is improved.

Description

Technical Field

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

[0002] A wafer butterfly check valve refers to a valve that automatically opens and closes the valve flap relying on the flow of the medium itself to prevent the reverse flow of the medium, also known as a non-return valve, a one-way valve, a counterflow valve, and a backpressure valve. A check valve belongs to an automatic valve, and its main functions are to prevent the reverse flow of the medium, prevent the pump and the driving motor from reversing, and the discharge of the container medium. The check valve can also be used on a pipeline that supplies a supplementary system whose pressure may rise above the system pressure. Check valves can be mainly divided into swing check valves and lift check valves;

[0003] The existing patent discloses the wafer butterfly check valve of CN209262333U3. By adding a threaded base outside the valve body and arranging a fastening stud inside the threaded base, the installation of this check valve is more convenient. Just insert the check valve into the pipeline and then tighten the fastening stud to complete the installation. The operation is easy, the structure is simple, and the practicability is strong;

[0004] However, in this patent, since the above device does not have a device for limiting the valve plate, during the use process, when the return spring is deformed for a long time, the elasticity of the return spring is reduced, resulting in the valve plate not being able to close tightly, causing water leakage in the valve. Therefore, the utility model proposes a wafer butterfly check valve. Summary of the Utility Model

[0005] The purpose of the utility model is to solve the disadvantages existing in the prior art and propose a wafer butterfly check valve.

[0006] To achieve the above purpose, the utility model adopts the following technical scheme: A wafer butterfly check valve includes a sleeve, an installation rod and a support rod are arranged inside the sleeve, a valve plate is rotatably connected to the installation rod, there are two valve plates in total, movable grooves are opened at the relatively far ends of the two valve plates, and a limiting component is slidably connected to the movable grooves;

[0007] The limiting component includes a limiting convex block and a slider. The limiting convex block and the slider are both slidably connected in the movable groove. A spring is arranged between the limiting convex block and the slider. A pressure plate movably penetrates through the movable groove. An installation ring is arranged on the side of the pressure plate close to the installation rod. A traction rope is wound around the installation ring, and the other end of the traction rope is connected to the bottom of the slider.

[0008] As a preferred embodiment, a return spring is sleeved on the mounting rod. There are two return springs in total, and the two return springs are respectively connected to the two valve plates. The other ends of the return springs are both clamped on the support rod.

[0009] The beneficial effect of adopting the above further solution is that when the fluid stops flowing, under the action of the return spring, pressure will be applied to close the valve, preventing the fluid from flowing back. During the fluid flow, suddenly closing the valve may cause a water hammer phenomenon, that is, a pressure shock wave generated when the fluid closes the valve. The return spring can provide additional damping and buffering before the valve closes, thereby reducing the occurrence of water hammer and protecting the pipeline and equipment.

[0010] As a preferred embodiment, flanges are provided at both ends of the sleeve. A limiting plate is provided on one side of the sleeve where the pressure plate is located. A limiting groove is formed on the inner wall of the sleeve, and the limiting groove is slidably connected to the limiting convex block.

[0011] The beneficial effect of adopting the above further solution is that the sleeve is connected and fixed to other pipe bodies through the flanges. The limiting groove and the limiting convex block are engaged with each other to limit the valve plate, preventing the valve plate from flipping and water from seeping into the sleeve when there is no water passing through or the elasticity of the return spring weakens.

[0012] As a preferred embodiment, limiting bolts are threadedly connected to both sides of the sleeve. There are four limiting bolts in total, and two of the four limiting bolts are in a group. Each group of limiting bolts respectively passes through the sleeve and is threadedly connected to the two ends of the mounting rod and the support rod.

[0013] The beneficial effect of adopting the above further solution is that the mounting rod and the support rod are fixed by the limiting bolts, so that the mounting rod and the support rod are detachable structures with the sleeve, which is more convenient for later disassembly and replacement of the valve plate or the return spring.

[0014] As a preferred embodiment, the cross-section of the pressure plate is a T-shaped structure. The side of the pressure plate close to the limiting plate is a circular plate structure, and the center of the pressure plate close to the mounting rod is a rod-shaped structure that slidably penetrates through the movable groove.

[0015] The beneficial effect of adopting the above further solution is that when the water impacts the pressure plate, the pressure plate will drive the slider to displace downward, thereby releasing the engagement between the slider and the limiting groove, so that the valve can flip normally when the water flows through.

[0016] As a preferred embodiment, spring limiting grooves are formed at the ends of the two valve plates close to each other. The spring limiting grooves are engaged with one end of the return spring, and the diameter of the spring limiting groove is larger than the diameter of the return spring.

[0017] The beneficial effects of adopting the above further solution are as follows: The return spring is limited by the spring limiting groove, preventing the return spring from rotating misaligned on the installation rod during deformation, which may cause the valve plate to not flip and close under the action of the return spring.

[0018] Compared with the prior art, the advantages and positive effects of the present utility model are as follows:

[0019] 1. The present utility model limits the valve plate through the limiting component. When there is no water flow passing through the casing, the valve plate can be in a vertical state and closed, avoiding tilting after the return spring is damaged, which may cause a gap between the casing and the valve plate. When the water flow impacts the pressure plate, the pressure plate slides to one side under the extrusion force. At this time, the traction rope pulls the limiting convex block to displace downward, causing the limiting convex block to retract into the movable groove and releasing the clamping state between the limiting convex block and the limiting groove, enabling the valve plate to flip normally. When the water flow disappears, the spring pulls the traction rope, causing the pressure plate to reset and driving the limiting convex block to jack up, engaging with the limiting groove to limit the valve plate. Compared with the traditional wafer type check valve, the device improves the practicability. Description of the Drawings

[0020] Figure 1 It is the front view of a wafer type check valve of the present utility model;

[0021] Figure 2 It is the rear view of a wafer type check valve of the present utility model;

[0022] Figure 3 It is the exploded view of a wafer type check valve of the present utility model;

[0023] Figure 4 It is the structural diagram of the casing in a wafer type check valve of the present utility model;

[0024] Figure 5 It is the structural diagram of the valve plate in a wafer type check valve of the present utility model;

[0025] Figure 6 It is the cross-sectional view of the valve plate in a wafer type check valve of the present utility model.

[0026] Reference Signs

[0027] 1. Casing; 11. Flange; 12. Limiting Groove; 13. Limiting Plate; 2. Valve Plate; 21. Movable Groove; 22. Spring Limiting Groove; 3. Limiting Component; 31. Pressure Plate; 32. Installation Ring; 33. Slide Block; 34. Spring; 35. Limiting Convex Block; 4. Installation Rod; 41. Limiting Bolt; 5. Support Rod; 6. Return Spring. Detailed Embodiments

[0028] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0029] Embodiment 1

[0030] As Figure 1-6 shown, the present utility model provides a technical solution: a wafer type check valve, including a sleeve 1, an installation rod 4 and a support rod 5 are arranged in the sleeve 1, a valve plate 2 is rotatably connected to the installation rod 4, two valve plates 2 are provided in total, movable grooves 21 are opened at the relatively far ends of the two valve plates 2, and a limiting component 3 is slidably connected to the movable grooves 21;

[0031] The limiting component 3 includes a limiting convex block 35 and a slider 33, the limiting convex block 35 and the slider 33 are both slidably connected in the movable groove 21, a spring 34 is arranged between the limiting convex block 35 and the slider 33, a pressure plate 31 movably penetrates through the movable groove 21, an installation ring 32 is arranged on the side of the pressure plate 31 close to the installation rod 4, a traction rope is wound around the installation ring 32, and the other end of the traction rope is connected to the bottom of the slider 33.

[0032] A return spring 6 is sleeved on the installation rod 4, two return springs 6 are provided in total, and the two return springs 6 are respectively connected to the two valve plates 2, and the other ends of the return springs 6 are respectively clamped on the support rod 5. When the fluid stops flowing, under the action of the return spring 6, pressure will be applied to close the valve to prevent the fluid from flowing back. During the fluid flow, suddenly closing the valve may generate a water hammer phenomenon, that is, a pressure shock wave generated when the fluid closes the valve. The return spring 6 can provide additional damping and buffering before the valve closes, thereby reducing the occurrence of water hammer and protecting the pipeline and equipment.

[0033] Embodiment 2

[0034] As Figure 1-6 shown, flange plates 11 are arranged at both ends of the sleeve 1, a limiting plate 13 is arranged on one side of the sleeve 1 where the pressure plate 31 is located, a limiting groove 12 is opened on the inner wall of the sleeve 1, and the limiting groove 12 is slidably connected to the limiting convex block 35. The sleeve 1 is connected and fixed to other pipe bodies through the flange plates 11, and the limiting groove 12 and the limiting convex block 35 are mutually clamped to limit the valve plate 2 to prevent the valve plate 2 from flipping and water seepage occurring in the sleeve 1 when there is no water passing through or the elasticity of the return spring 6 weakens.

[0035] On both sides of the sleeve 1, there are limit bolts 41 connected by threads. There are four limit bolts 41 in total, and two of the four limit bolts 41 are in a group. Each group of limit bolts 41 respectively penetrates through the sleeve 1 and is threadedly connected to both ends of the mounting rod 4 and the support rod 5. The mounting rod 4 and the support rod 5 are fixed by the limit bolts 41, so that the mounting rod 4 and the support rod 5 are detachable structures from the sleeve 1, which is convenient for more convenient disassembly and replacement of the valve plate 2 or the return spring 6 in the later stage.

[0036] The cross-section of the pressure plate 31 is a T-shaped structure. The side of the pressure plate 31 close to the limit plate 13 is a circular plate structure. The center of the pressure plate 31 close to the mounting rod 4 is a rod-shaped structure that slides through the movable groove 21. When water impacts the pressure plate 31, the pressure plate 31 will drive the slider 33 to displace downward, thereby releasing the clamping connection between the slider 33 and the limit groove 12, so that the valve can be normally flipped when water flows through.

[0037] Spring limit grooves 22 are provided at one end of the two valve plates 2 close to each other. The spring limit grooves 22 are engaged with one end of the return spring 6. The diameter of the spring limit grooves 22 is larger than the diameter of the return spring 6. The return spring 6 is limited by the spring limit grooves 22 to prevent the return spring 6 from rotating out of position on the mounting rod 4 during deformation, resulting in the valve plate 2 being unable to flip and close under the action of the return spring 6.

[0038] In the present utility model, the towing rope is formed by weaving polyester fibers. Polyester fibers have good corrosion resistance, high strength, and good wear resistance.

[0039] Working principle:

[0040] As Figure 1-6 shown, the sleeve 1 is flange-connected to other pipe bodies through the flange 11. When water flows through, the water first contacts the pressure plate 31. Under the action of the thrust, the pressure plate 31 displaces to one side. At this time, during the movement of the pressure plate 31, it will drive the towing rope to be pulled outwards, so that the spring 34 and the limit protrusion 35 slide downward, thereby releasing the clamped state of the limit protrusion 35 and the limit groove 12, causing the valve plate 2 to flip so that water can pass through. When the water flow disappears, the valve plate 2 drives the two valve plates 2 to flip and close to both sides under the action of the return spring 6. At this time, the limit protrusion 35 is re-engaged in the limit groove 12 to limit the valve plate 2 to prevent the valve plate 2 from having a gap when not in use.

[0041] The above are only the preferred embodiments of the present utility model, and are not intended to limit the present utility model in other forms. Any person skilled in the relevant art may use the technical content disclosed above to make changes or modifications into equivalent embodiments with equivalent changes and apply them to other fields. However, as long as it does not depart from the technical solution content of the present utility model, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present utility model still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A wafer type butterfly check valve, characterized in that, It includes a sleeve (1), an installation rod (4) and a support rod (5) are arranged inside the sleeve (1), a valve plate (2) is rotatably connected to the installation rod (4), there are two valve plates (2) in total, movable grooves (21) are formed at the relatively far ends of the two valve plates (2), and a limiting component (3) is slidably connected to the movable grooves (21); The limiting component (3) includes a limiting bump (35) and a slider (33), the limiting bump (35) and the slider (33) are both slidably connected inside the movable groove (21), a spring (34) is arranged between the limiting bump (35) and the slider (33), a pressure plate (31) movably penetrates through the movable groove (21), an installation ring (32) is arranged on the side of the pressure plate (31) close to the installation rod (4), a traction rope is wound around the installation ring (32), and the other end of the traction rope is connected to the bottom of the slider (33).

2. The wafer type butterfly check valve according to claim 1, wherein: A return spring (6) is sleeved on the installation rod (4), there are two return springs (6) in total, and the two return springs (6) are respectively connected to the two valve plates (2), and the other ends of the return springs (6) are respectively clamped on the support rod (5).

3. The wafer type butterfly check valve according to claim 1, characterized in that: Flange plates (11) are arranged at both ends of the sleeve (1), a limiting plate (13) is arranged on one side of the sleeve (1) where the pressure plate (31) is located, and a limiting groove (12) is formed on the inner wall of the sleeve (1), and the limiting groove (12) is slidably connected to the limiting bump (35).

4. The wafer type butterfly check valve according to claim 1, characterized in that: Limiting bolts (41) are threadedly connected to both sides of the sleeve (1), there are four limiting bolts (41) in total, and the four limiting bolts (41) are divided into two groups, and each group of limiting bolts (41) respectively penetrates through the sleeve (1) and is threadedly connected to the two ends of the installation rod (4) and the support rod (5).

5. The wafer type butterfly check valve according to claim 1, characterized in that: The cross section of the pressure plate (31) is a T-shaped structure, the side of the pressure plate (31) close to the limiting plate (13) is a circular plate structure, and the center of the pressure plate (31) close to the installation rod (4) is a rod-shaped structure that slidably penetrates through the movable groove (21).

6. The wafer type butterfly check valve according to claim 1, characterized in that: Spring limiting grooves (22) are formed at the ends of the two valve plates (2) close to each other, the spring limiting grooves (22) are clamped with one end of the return spring (6), and the diameter of the spring limiting groove (22) is larger than the diameter of the return spring (6).

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