Slow closing mechanism of check valve

Abstract

The utility model discloses a slow closing mechanism of a check valve. The slow closing mechanism comprises a valve body, the check mechanism comprises a mounting strip fixedly connected between the front inner wall and the rear inner wall of the valve body, the left side of the mounting strip is fixedly connected with a piston cylinder, a piston block capable of sliding left and right is arranged in the piston cylinder, and the right side of the piston block is elastically connected with the inner wall of the right side of the piston cylinder through a spring. A connecting rod is fixedly connected to the left side of the piston block, a sealing plug is fixedly connected to the left side of the connecting rod, a sealing backing ring is installed on the inner wall of the left side of the valve body, connecting flanges are installed on the left side and the right side of the valve body, the right side face of the sealing backing ring is in a slope shape, and the left side face of the sealing plug is in a slope shape. In the actual use process of the mechanism, the opening and closing speed of the sealing piston part of the check valve can be adjusted, so that the water hammer is avoided, and in addition, the mechanism can adapt to more use scenes.

Description

TECHNICAL FIELD

[0001] The utility model relates to check valve technical field especially relates to a check valve slow closing mechanism. BACKGROUND

[0002] As a key control element in fluid conveying system, check valve is widely used in many industrial fields such as petroleum, chemical industry, electric power, water treatment, water supply and drainage, etc. Its main function is to prevent medium backflow and ensure fluid unidirectional flow according to the predetermined direction, so as to guarantee the stable operation of the whole system and equipment safety. For example, in the pipeline conveying system of petroleum and chemical industry, check valve can effectively prevent medium backflow, avoid equipment damage, process disorder and even safety accidents caused by backflow; in water treatment engineering, check valve can prevent backflow of treated water to untreated water source, ensure water quality safety.

[0003] The opening and closing speed of the sealing piston of the existing check valve is often not adjustable, which leads to that when the fluid in the system suddenly stops flowing, the sealing piston of the traditional check valve will close rapidly, the fluid continues to flow forward due to inertia, and a violent collision occurs between the closed piston and the fluid, resulting in a strong water hammer effect. The water hammer phenomenon not only produces a lot of noise and vibration, but also causes serious impact and damage to the pipeline, valve and related equipment, shortens the service life of the equipment, and the unadjustable opening and closing speed makes it difficult for the check valve to adapt to the fluid flow characteristics under different working conditions. In the system with large flow variation or complex fluid medium characteristics, the traditional check valve cannot flexibly adjust the movement speed of the sealing piston according to the actual demand, resulting in large pressure fluctuation of the system, unstable fluid flow, and further affecting the operation efficiency and stability of the whole system. SUMMARY

[0004] The utility model discloses a check valve slow closing mechanism, which can adjust the opening and closing speed of the sealing piston of the check valve in actual use, thereby avoiding the generation of water hammer, and can also adapt to more use scenarios.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] A check valve slow closing mechanism, comprising a valve body, a check mechanism, the check mechanism comprising a mounting strip fixedly connected between the front and rear inner walls of the valve body, a piston cylinder fixedly connected to the left side of the mounting strip, a piston block slidably arranged in the piston cylinder, the right side of the piston block being elastically connected to the right inner wall of the piston cylinder through a spring, a connecting rod fixedly connected to the left side of the piston block, a sealing plug fixedly connected to the left side of the connecting rod, and a sealing gasket ring installed on the left inner wall of the valve body.

[0007] Preferably, the left and right sides of the valve body are provided with connecting flanges.

[0008] Preferably, the right side of the gasket ring is beveled, and the left side of the sealing plug is beveled.

[0009] Preferably, the outer side of the valve body is provided with a first annular groove, and the right side space of the piston cylinder is communicated with the first annular groove through a first communication pipe.

[0010] Preferably, the outer side of the valve body is provided with a second annular groove, and the right side space of the piston cylinder is communicated with the second annular groove through a second communication pipe.

[0011] Preferably, the outer side of the first annular groove is rotatably connected with a first sealing ring, and the outer side of the second annular groove is rotatably connected with a second sealing ring, and the inner sides of the first sealing ring and the second sealing ring are provided with rubber layers.

[0012] Preferably, the first communication pipe is matched with the first communication port, and the second communication pipe is matched with the second communication port.

[0013] Preferably, the first communication pipe is matched with the first communication port, and the second communication pipe is matched with the second communication port.

[0014] Preferably, the first communication pipe is matched with the first communication port, and the second communication pipe is matched with the second communication port.

[0015] Preferably, the first sealing ring and the second sealing ring are provided with limiting screws penetrating through, and the limiting screws are threadedly connected with the corresponding first sealing ring and second sealing ring.

[0016] Compared with the prior art, the utility model has the advantages of:

[0017] The check mechanism composed of the piston cylinder, the piston block and the spring can realize the normal opening and closing functions of the check valve, the spring energy storage and release process is stable and reliable, the annular groove, the communication pipe, the sealing ring and the one-way valve can be used for flexibly adjusting the moving speed of the piston, the opening and slow closing speed of the check valve can be accurately controlled, the water hammer phenomenon is effectively reduced, and the adaptability in actual use is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a structure schematic view of the embodiment 1 of the utility model;

[0019] Figure 2 It is a sectional view schematic view of the utility model; Figure 1

[0020] Figure 3 ​Structure schematic view of embodiment 2 of the utility model;

[0021] Figure 4 For Figure 3 The cross section schematic view of embodiment 1 of the utility model is shown in the figure.

[0022] Figure 5 Structure schematic view of embodiment 3 of the utility model.

[0023] In the figure: 1 valve body, 2 connecting flange, 3 first annular groove, 4 sealing plug, 5 sealing gasket ring, 6 connecting rod, 7 piston block, 8 piston cylinder, 9 mounting strip, 10 spring, 11 first communication pipe, 12 first sealing ring, 13 first communication port, 14 second sealing ring, 15 second communication port, 16 second communication pipe, 17 first one-way valve, 18 second one-way valve, 19 second annular groove, 20 limit screw. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.

[0025] Embodiment 1

[0026] With reference to Figures 1-2 A check valve slow closing mechanism, including valve body 1, the left and right sides of valve body 1 are both installed with connecting flange 2, through connecting flange 2, it will be convenient to connect valve body 1 with the pipeline that needs;

[0027] Wherein, still include check mechanism, check mechanism includes the mounting strip 9 that is fixedly connected between the front and rear inner wall of valve body 1, the left side of mounting strip 9 is fixedly connected with piston cylinder 8, piston cylinder 8 is provided with the piston block 7 that can slide left and right, the right side of piston block 7 is elastically connected with the right side inner wall of piston cylinder 8 through spring 10, the left side of piston block 7 is fixedly connected with connecting rod 6, the left side of connecting rod 6 is fixedly connected with sealing plug 4, and sealing gasket ring 5 is installed on the left inner wall of valve body 1.

[0028] Wherein, the right side of sealing gasket ring 5 is inclined, the left side of sealing plug 4 is inclined, the outside of valve body 1 is provided with first annular groove 3, and the right side space of piston cylinder 8 is communicated with first annular groove 3 through first communication pipe 11.

[0029] In actual use, when fluid flows from the right side of valve body 1 to the left, fluid pressure acts on the right side of sealing plug 4. Since sealing plug 4 and piston block 7 are fixedly connected through connecting rod 6, under the action of fluid pressure, sealing plug 4 pushes piston block 7 to slide right in piston cylinder 8.

[0030] When the piston block 7 slides to the right, the spring 10 is compressed and stores elastic potential energy. At the same time, the sealing plug 4 gradually moves away from the sealing gasket ring 5, and the fluid can pass through the gap between the sealing plug 4 and the sealing gasket ring 5, realizing the normal opening of the check valve, and the fluid flows smoothly from the right side of the valve body 1 to the left side.

[0031] When the fluid stops flowing, the pressure of the fluid on the sealing plug 4 decreases. At this time, the spring 10 releases the stored elastic potential energy, pushes the piston block 7 to slide to the left, and then drives the sealing plug 4 to move to the left, preparing to close the check valve.

[0032] Embodiment 2

[0033] With reference to Figures 3-4 The difference between this embodiment and embodiment 1 is that a second annular groove 19 is formed on the outer side of the valve body 1, the right side space of the piston cylinder 8 is communicated with the second annular groove 19 through a second communication pipe 16, the first sealing ring 12 is rotatably connected to the outer side of the first annular groove 3, the second sealing ring 14 is rotatably connected to the outer side of the second annular groove 19, the inner sides of the first sealing ring 12 and the second sealing ring 14 are provided with rubber layers, the first sealing ring 12 is provided with a first communication port 13, the second sealing ring 14 is provided with a second communication port 15, the first communication port 13 is matched with the first communication pipe 11, the second communication port 15 is matched with the second communication pipe 16, the first one-way valve 17 is installed in the first communication pipe 11, the second one-way valve 18 is installed in the second communication pipe 16, the flow direction of the first one-way valve 17 is from bottom to top, and the flow direction of the second one-way valve 18 is from top to bottom.

[0034] In specific use, the pipe diameters of the first communication pipe 11 and the second communication pipe 16 in this scheme are relatively large, when the piston block 7 moves to the right, the exhaust is realized through the first communication pipe 11, when the piston block 7 moves to the left, the intake is realized through the second communication pipe 16, the user can adjust the opening amplitude of the first communication pipe 11 and the second communication pipe 16 by twisting the first sealing ring 12 and the second sealing ring 14, adjust the exhaust speed and the intake speed, and then adjust the actual moving speed of the piston during use, so as to meet the actual use demand, and the rubber layer can increase the sliding friction and avoid the automatic rotation.

[0035] Embodiment 3

[0036] With reference to Figure 5 The difference between this embodiment and embodiment 2 is that the limiting screws 20 are arranged through the first sealing ring 12 and the second sealing ring 14, and the limiting screws 20 are threadedly connected with the corresponding first sealing ring 12 and second sealing ring 14.

[0037] After the rotation is completed, the two limiting screws 20 can be tightened to limit the first sealing ring 12 and the second sealing ring 14, so that they are more stable.

[0038] The above merely describes a preferred embodiment of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art, according to the technical scheme and the inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A check valve slow closing mechanism characterized by, Include: Valve body (1); Check mechanism, the installation strip (9) is fixedly connected between the front and rear inner walls of the valve body (1), the left side of the installation strip (9) is fixedly connected with the piston cylinder (8), the piston cylinder (8) is provided with a piston block (7) that can slide left and right, the right side of the piston block (7) is elastically connected with the right inner wall of the piston cylinder (8) through the spring (10), the left side of the piston block (7) is fixedly connected with the connecting rod (6), the left side of the connecting rod (6) is fixedly connected with the sealing plug (4), and the left inner wall of the valve body (1) is provided with a sealing gasket ring (5).

2. A slow closing mechanism for a check valve according to claim 1 wherein, The left and right sides of the valve body (1) are provided with connecting flanges (2).

3. A slow closing mechanism for a check valve according to claim 1 wherein, The right side surface of the sealing gasket ring (5) is beveled, and the left side surface of the sealing plug (4) is beveled.

4. A slow closing mechanism for a check valve according to claim 1 wherein, The outer side of the valve body (1) is provided with a first annular groove (3), and the right side space of the piston cylinder (8) is communicated with the first annular groove (3) through a first communication pipe (11).

5. A slow closing mechanism for a check valve according to claim 4 wherein, The outer side of the valve body (1) is provided with a second annular groove (19), and the right side space of the piston cylinder (8) is communicated with the second annular groove (19) through a second communication pipe (16).

6. A slow closing mechanism for a check valve according to claim 5 wherein, The outer side of the first annular groove (3) is rotatably connected with a first sealing ring (12), and the outer side of the second annular groove (19) is rotatably connected with a second sealing ring (14), and the inner sides of the first sealing ring (12) and the second sealing ring (14) are provided with rubber layers.

7. A slow closing mechanism for a check valve according to claim 6 wherein, The first sealing ring (12) is provided with a first communication port (13), and the second sealing ring (14) is provided with a second communication port (15).

8. A slow closing mechanism for a check valve according to claim 7, wherein The first communication port (13) is matched with the first communication pipe (11), and the second communication port (15) is matched with the second communication pipe (16).

9. A slow closing mechanism for a check valve according to claim 8 wherein, The first communication pipe (11) is provided with a first one-way valve (17), and the second communication pipe (16) is provided with a second one-way valve (18), the flow direction of the first one-way valve (17) is from bottom to top, and the flow direction of the second one-way valve (18) is from top to bottom.

10. A slow closing mechanism for a check valve according to claim 6 wherein, The first sealing ring (12) and the second sealing ring (14) are provided with a limiting screw (20), and the limiting screw (20) is threadedly connected with the corresponding first sealing ring (12) and the second sealing ring (14).

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