Silencing check valve capable of preventing fluid from flowing back

Abstract

The utility model relates to the technical field of noise elimination check valves, in particular to a noise elimination check valve capable of preventing fluid backflow, which comprises flange plates, a noise elimination valve body, a fixing rod, a valve rod assembly, a backflow prevention assembly and a valve plate, the flange plates are mounted at two ends of the noise elimination valve body, the fixing rod is mounted on the inner wall of the flange plate on one side, and the backflow prevention assembly is mounted on the inner wall of the flange plate on the other side. The valve rod assembly penetrates through the fixing rod and extends to the inner side of the noise elimination valve body, the valve plate is installed at the end of the valve rod assembly, a sealing ring is installed on the inner wall of the flange plate on the side away from the fixing rod, and the backflow prevention assembly is rotationally installed on the inner wall of the noise elimination valve body. The arc-shaped baffle is driven to deflect towards the water inlet side when the valve plate is reset, fluid flowing into the silencing valve body is prevented from flowing towards the water inlet side, the problem that the service life of a pump body is shortened due to backflow of a small amount of fluid when the valve body is opened and closed frequently is solved, and the effect of prolonging the service life of the pump body is achieved.

Description

Technical Field

[0001] This utility model relates to the field of silencer check valve technology, specifically a silencer check valve for preventing fluid backflow. Background Technology

[0002] Silent check valves are important safety and functional devices in pipeline systems. They can prevent fluid backflow, reduce noise, and improve system operating efficiency. Their main function is to prevent fluid from flowing back in the pipeline, which is especially important in pump systems. They can be used to prevent liquid backflow after the pump stops, which could cause pump damage or system failure.

[0003] Existing check valves typically achieve a check-back effect by closing the valve plate and valve body. When the valve plate resets, it moves towards the side with higher water pressure. This reset means that the inlet water pressure has decreased. When the valve plate then moves back towards the inlet side, it causes the fluid that has entered the valve body to flow towards the inlet side, resulting in some fluid backflow. Although this has little impact on the pump body in the short term, when fluid is intermittently transported in the pipeline, the valve body opens and closes more frequently. As the number of times a small amount of fluid backflows increases, it will also have an adverse effect on the pump body, shortening its service life.

[0004] To address this, a silent check valve is proposed to prevent fluid backflow. Utility Model Content

[0005] The purpose of this utility model is to provide a silent check valve that prevents fluid backflow. By driving the arc-shaped baffle to deflect towards the inlet side when the valve plate is reset, the fluid that has flowed into the silent valve body is prevented from flowing towards the inlet side. This solves the problem of a small amount of fluid backflow causing a shortened service life of the pump body when the valve body is frequently opened and closed, and has the effect of extending the service life of the pump body.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A silent check valve for preventing fluid backflow includes a flange, a silent valve body, a fixed rod, a valve stem assembly, an anti-backflow assembly, and a valve plate. The flange is installed at both ends of the silent valve body. The fixed rod is installed on the inner wall of one of the flanges. The valve stem assembly extends through the fixed rod to the inner side of the silent valve body. The valve plate is installed at the end of the valve stem assembly. A sealing ring is installed on the inner wall of the flange on the side away from the fixed rod. The anti-backflow assembly is rotatably installed on the inner wall of the silent valve body and is rotatably connected to the valve plate near the fixed rod. When the valve plate moves to the sealing ring side to reset, the anti-backflow assembly deflects and obstructs the flow of fluid to the sealing ring side.

[0008] Preferably, the valve stem assembly includes an end ring, a limiting rod, a spring, a connecting ring, and a connecting disc. The limiting rod passes through the central axis of the fixed rod. The end ring is installed at one end of the limiting rod, and the connecting ring is installed at the other end of the limiting rod. The spring is sleeved on the outer periphery of the limiting rod and abuts against the fixed rod and the connecting ring. The connecting disc is installed between the connecting ring and the side wall of the valve plate.

[0009] Preferably, the anti-backflow component includes an arc-shaped baffle and a connecting rod, the arc-shaped baffle being rotatably mounted on the inner wall of the silencer valve body, and the end of the connecting rod being rotatably connected to the arc-shaped baffle.

[0010] Preferably, the valve plate sidewall is equipped with equally spaced limiting seats, and the end of the connecting rod is rotatably connected to the limiting seats.

[0011] Preferably, the end of the limiting rod is equipped with a plug, and the connecting ring has a slot that matches the plug.

[0012] Preferably, the outer circumference of the limiting rod is integrally formed with several semi-circular protrusions, and the side wall of the fixing rod is provided with a through hole adapted to the limiting rod.

[0013] Preferably, the valve plate is arc-shaped, and a guide plate is fitted to the side wall of the valve plate.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] 1. The valve stem assembly has a large contact area between the limiting rod and the fixed rod, which ensures that the valve plate moves linearly when it moves horizontally along with the limiting rod. This effectively prevents the valve plate from failing to maintain linear movement and causing misalignment of the sealing ring, which would result in the silencer valve body failing to close. This also prevents fluid backflow and effectively improves the protection of the pipeline pump.

[0016] 2. Through the anti-backflow components, valve plate, and limit seat, when the silencer valve body is opened, the arc-shaped baffle deflects towards the outlet side to ensure that the fluid flows smoothly through the interior of the silencer valve body. When the valve plate is reset, the arc-shaped baffle deflects towards the inlet side, which can block the fluid in the gap between the outer periphery of the valve plate and the inner periphery of the silencer valve body, further reducing the flow rate of fluid flowing towards the inlet side, thereby further improving the protection effect on the pipeline pump body.

[0017] 3. With the help of the guide plate and sealing ring, the valve plate can fully fit with the sealing ring after it is reset, ensuring the sealing effect when the silencer valve body is closed. In addition, when the valve plate is about to be reset, the fluid with reduced pressure is squeezed by the guide plate and flows to the periphery of the valve plate, which balances the fluid flowing back towards the inlet side in the silencer valve body, thereby reducing the flow rate of fluid flowing towards the inlet side and further improving the protection effect of the pipeline pump body. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a cross-sectional view of the silencer valve body of this utility model in the closed state;

[0020] Figure 3 This is a cross-sectional view of the silencer valve body of this utility model in the open state.

[0021] Figure 4 This is a schematic diagram of the valve stem assembly and valve plate of this utility model;

[0022] Figure 5 This is an exploded view of the valve stem assembly of this utility model.

[0023] In the diagram: 1. Flange; 2. Silencer valve body; 3. Fixed rod; 4. Valve stem assembly; 41. End ring; 42. Limiting rod; 421. Insert block; 43. Spring; 44. Connecting ring; 45. Connecting disc; 5. Anti-backflow assembly; 51. Arc-shaped baffle; 52. Connecting rod; 6. Valve plate; 61. Limiting seat; 7. Guide plate; 8. Sealing ring. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figures 1 to 5 This utility model provides a silent check valve to prevent fluid backflow, and the technical solution is as follows:

[0026] A silent check valve for preventing fluid backflow includes a flange 1, a silent valve body 2, a fixed rod 3, a valve stem assembly 4, an anti-backflow assembly 5, and a valve plate 6. The flange 1 is installed at both ends of the silent valve body 2, and the ends of the flange 1 are sealed to the silent valve body 2. The fixed rod 3 is installed on the inner wall of one side of the flange 1. The cross-section of the fixed rod 3 is a horizontally distributed V-shape, and the corner is located inside the silent valve body 2. The valve stem assembly 4 extends through the fixed rod 3 to the inner side of the silent valve body 2. The valve plate 6 is installed at the end of the valve stem assembly 4. A sealing ring 8 is installed on the inner wall of the flange 1 on the side away from the fixed rod 3. The sealing ring 8 is installed on the inlet side of the silent valve body 2 (the side away from the fixed rod 3). The anti-backflow assembly 5 is rotatably installed on the inner wall of the silent valve body 2, and the anti-backflow assembly 5 is rotatably connected to the side of the valve plate 6 near the fixed rod 3. When the valve plate 6 moves to the side of the sealing ring 8 to reset, the anti-backflow assembly 5 deflects and obstructs the flow of fluid to the side of the sealing ring 8.

[0027] As one embodiment of this application, refer to Figure 4 and Figure 5 The valve stem assembly 4 includes an end ring 41, a limiting rod 42, a spring 43, a connecting ring 44, and a connecting plate 45. The limiting rod 42 passes through the central axis of the fixed rod 3, and the central axis of the fixed rod 3 is in the same straight line direction as the center of the valve plate 6. The end ring 41 is installed at one end of the limiting rod 42, and the connecting ring 44 is installed at the other end of the limiting rod 42. The spring 43 is sleeved on the outer circumference of the limiting rod 42, and the spring 43 abuts between the fixed rod 3 and the connecting ring 44. The connecting plate 45 is installed between the connecting ring 44 and the side wall of the valve plate 6.

[0028] As one embodiment of this application, refer to Figure 3 The anti-backflow component 5 includes an arc-shaped baffle 51 and a connecting rod 52. The arc-shaped baffle 51 is rotatably mounted on the inner wall of the silencer valve body 2. The end of the connecting rod 52 is rotatably connected to the arc-shaped baffle 51. The number of arc-shaped baffles 51 is at least four, and there is a small gap between adjacent arc-shaped baffles 51 to avoid interference during the rotation of the arc-shaped baffles 51.

[0029] As one embodiment of this application, refer to Figure 4 The valve plate 6 has equally spaced limit seats 61 installed on its side wall. The end of the connecting rod 52 is rotatably connected to the limit seat 61. The rotation angle of the connecting rod 52 can be increased by rotating the seat, which in turn makes the deflection angle of the arc baffle 51 larger, so that the flow rate of the fluid will not be affected when the silencer valve body 2 is opened.

[0030] As one embodiment of this application, refer to Figure 5 The end of the limiting rod 42 is equipped with a plug 421, and the connecting ring 44 has a slot that matches the plug 421. The limiting rod 42 and the connecting ring 44 can be easily installed and connected by the cooperation of the plug 421 and the slot. During pre-installation, the connecting ring 44 and the connecting plate 45 are fixed to the valve plate 6 and then placed into the silencer valve body 2.

[0031] As one embodiment of this application, refer to Figure 5 The outer circumference of the limiting rod 42 is integrally formed with several semi-circular protrusions. The side wall of the fixing rod 3 is provided with through holes that are adapted to the limiting rod 42. Under the action of the semi-circular protrusions, the contact area between the limiting rod 42 and the fixing rod 3 is increased so that the limiting rod 42 can move in a straight line.

[0032] As one embodiment of this application, see the appendix. Figure 2 and Figure 3The valve plate 6 has an arc-shaped structure, and a guide plate 7 is installed on the side wall of the valve plate 6. The guide plate 7 is also arc-shaped. When the valve plate 6 is reset, it can squeeze the fluid outside the silencer valve body 2 on the inlet side. The pressurized fluid flows to the outer side of the valve plate 6 and reaches a balance with the fluid inside the silencer valve body 2 that wants to flow back, thus preventing the fluid from flowing back.

[0033] Working principle: When the fluid pressure at the inlet reaches a certain value, the fluid pushes the guide plate 7 and valve plate 6 towards the fixed rod 3, causing the valve plate 6 and the limiting rod 42 to move towards the fixed rod 3 together. The length of the limiting rod 42 passing through the fixed rod 3 increases, and the spring 43 is compressed and contracts. The movement of the valve plate 6 drives the connecting rod 52 to rotate, which in turn drives the arc-shaped baffle 51 to deflect towards the fixed rod 3. The fluid entering the silencer valve body 2 passes through the gap between the inner circumference of the silencer valve body 2 and the outer circumference of the valve plate 6.

[0034] When the fluid pressure on the inlet side decreases and the silencer valve body 2 can no longer be kept open, the valve plate 6 is pushed towards the sealing ring 8 by the spring 43. At this time, the valve plate 6 moves in the opposite direction and deflects to the initial position through the connecting rod 52. The fluid that has entered the silencer valve body 2 is blocked by the arc-shaped baffle 51, which slows down the flow speed towards the inlet side. The guide plate 7 squeezes the fluid on the inlet side, causing the fluid to move towards the outer circumference of the valve plate 6 and reach a balance with the fluid flowing towards the inlet side. Then the valve plate 6 and the sealing ring 8 fit together to close the silencer valve body 2.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A silent check valve for preventing fluid backflow, comprising a flange (1), a silent valve body (2), and a fixing rod (3), characterized in that: It also includes a valve stem assembly (4), an anti-backflow assembly (5), and a valve plate (6). The flange (1) is installed at both ends of the silencer valve body (2). The fixing rod (3) is installed on the inner wall of one of the flanges (1). The valve stem assembly (4) extends through the fixing rod (3) to the inner side of the silencer valve body (2). The valve plate (6) is installed at the end of the valve stem assembly (4). A sealing ring (8) is installed on the inner wall of the flange (1) away from the fixing rod (3). The anti-backflow assembly (5) is rotatably installed on the inner wall of the silencer valve body (2). The anti-backflow assembly (5) is rotatably connected to the valve plate (6) on the side close to the fixing rod (3). When the valve plate (6) moves to the sealing ring (8) side to reset, the anti-backflow assembly (5) deflects to prevent the fluid from flowing to the sealing ring (8) side.

2. The silent check valve for preventing fluid backflow according to claim 1, characterized in that: The valve stem assembly (4) includes an end ring (41), a limiting rod (42), a spring (43), a connecting ring (44), and a connecting plate (45). The limiting rod (42) passes through the central axis of the fixed rod (3). The end ring (41) is installed at one end of the limiting rod (42), and the connecting ring (44) is installed at the other end of the limiting rod (42). The spring (43) is sleeved on the outer periphery of the limiting rod (42) and abuts against the fixed rod (3) and the connecting ring (44). The connecting plate (45) is installed between the connecting ring (44) and the side wall of the valve plate (6).

3. A silent check valve for preventing fluid backflow according to claim 2, characterized in that: The anti-backflow component (5) includes an arc-shaped baffle (51) and a connecting rod (52). The arc-shaped baffle (51) is rotatably mounted on the inner wall of the silencer valve body (2), and the end of the connecting rod (52) is rotatably connected to the arc-shaped baffle (51).

4. A silent check valve for preventing fluid backflow according to claim 3, characterized in that: The valve plate (6) has equally spaced limiting seats (61) installed on its side wall, and the end of the connecting rod (52) is rotatably connected to the limiting seats (61).

5. A silent check valve for preventing fluid backflow according to claim 4, characterized in that: The end of the limiting rod (42) is equipped with a plug (421), and the connecting ring (44) has a slot that is adapted to the plug (421).

6. A silent check valve for preventing fluid backflow according to claim 5, characterized in that: The outer circumference of the limiting rod (42) is integrally formed with several semi-circular protrusions, and the side wall of the fixing rod (3) is provided with a through hole that matches the limiting rod (42).

7. A silent check valve for preventing fluid backflow according to claim 6, characterized in that: The valve plate (6) is arc-shaped, and a guide plate (7) is attached to the side wall of the valve plate (6).

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