Backflow prevention butterfly valve

Abstract

The utility model discloses an anti-backflow butterfly valve, which comprises a valve body, a valve cavity, a butterfly plate, a barrier plate and an anti-backflow plate, the valve cavity is arranged inside the valve body, the butterfly plate is arranged inside the valve cavity, a valve shaft is fixedly arranged inside the butterfly plate, a liquid inlet is arranged at one end inside the valve body, and a liquid outlet is arranged at the other end inside the valve body. A liquid outlet is formed in the other end of the interior of the valve body, the blocking plates are fixed to the connecting position of the liquid outlet and the valve cavity, circulation openings are formed in the blocking plates, and the backflow preventing plate is installed in the liquid outlet in one side of the blocking plates through a spring. And a sealing plug adheres to the outer wall of the side, close to the blocking plate, of the backflow preventing plate, a liquid drainage hole is formed in one side of the bottom of the valve cavity, a driver is installed at the top end of the valve body, an adjusting rod is installed on one side of the driver, and a hand wheel is installed at one end of the adjusting rod. The anti-backflow valve has the anti-backflow function, water is not prone to being accumulated, and damage to the interior of the valve body is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of butterfly valves, in particular to an anti-backflow butterfly valve. Background Art

[0002] The butterfly valve is a simple regulating valve, which consists of a valve body, a butterfly plate, a valve shaft and other components. Its working principle is to rotate the valve shaft to drive the butterfly plate to rotate, so as to open and close the valve. The butterfly valve mainly plays the role of cutting off and throttling in the pipeline, and has good fluid control characteristics. The advantages of the butterfly valve include small size, light weight, small installation size, small driving torque, simple and quick operation, etc. In addition, the butterfly valve can also select different sealing surface materials according to the requirements of different media to ensure that the sealing surface is wear-resistant, corrosion-resistant and has a long service life.

[0003] The butterfly valve has a wide range of applications and can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. It is widely used in industrial pipeline systems such as fire protection, ventilation, water supply and drainage, petroleum, chemical industry, and electric power.

[0004] At present, the internal structure of the butterfly valve is relatively simple. Usually, there is no good structure to limit the backflow of the circulating medium, and the circulating medium cannot be isolated. Therefore, the butterfly valve often has the phenomenon of water backflow. In addition, water is easily stored inside the butterfly valve, affecting user use, so it is urgently needed to be improved. Utility Model Content

[0005] The purpose of the utility model is to provide an anti-backflow butterfly valve to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned objectives, the utility model provides the following technical solutions: an anti-backflow butterfly valve, comprising a valve body, a valve cavity, a butterfly plate, a baffle plate and an anti-backflow plate, the valve cavity is arranged inside the valve body, the butterfly plate is installed inside the valve cavity, and a valve shaft is fixedly installed inside the butterfly plate, a liquid inlet is arranged at one end inside the valve body, and a liquid outlet is arranged at the other end inside the valve body, the baffle plate is fixed at the connection between the liquid outlet and the valve cavity, and a flow port is arranged inside each of the baffle plates, the anti-backflow plate is installed inside the liquid outlet on one side of the baffle plate through a spring, and a sealing plug is adhered to the outer wall of the anti-backflow plate close to the baffle plate, the sealing plug corresponds to the flow port one by one, a drainage hole is arranged on one side of the bottom of the valve cavity, the drainage hole is connected with the liquid outlet, a driver is installed on the top of the valve body, an adjusting rod is installed on one side of the driver, and a hand wheel is installed on one end of the adjusting rod.

[0007] Preferably, the liquid inlet and the liquid outlet are both connected to the valve cavity.

[0008] Preferably, a filter screen is installed inside the liquid inlet to filter out particulate impurities in the circulating medium.

[0009] Preferably, an annular dirt storage tank is provided on the inner wall of the filter screen to temporarily store impurities.

[0010] Preferably, an arc-shaped concave surface is provided on the outer wall of the backflow prevention plate on the side away from the sealing plug to facilitate the collection of the thrust of the water flow.

[0011] Preferably, friction ridges are provided on the outer walls of the adjusting rods to increase the friction between the adjusting rods and the arc-shaped ferrules.

[0012] Preferably, an arc-shaped sleeve is installed on the outer wall of the driver above the adjusting rod through a rotating shaft, and the arc-shaped sleeve is tightly engaged with the friction ridge to facilitate locking the adjusting rod to prevent it from loosening.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] When liquid flows back, the force generated by the backflowing liquid pushes the anti-backflow plate to overcome the elastic force of the spring and move toward the blocking plate. The anti-backflow plate drives the sealing plug to get into the flow port to seal the flow port, thereby preventing the liquid from flowing back into the valve cavity, thereby preventing backflow. The setting of the arc-shaped concave surface facilitates force gathering and facilitates the water flow to push the anti-backflow plate to move horizontally. When the butterfly valve is in a closed state, the residual liquid in the valve cavity flows out through the drain hole to prevent water accumulation in the valve cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a side cross-sectional structural schematic diagram of the utility model;

[0016] Figure 2 It is a front view cross-sectional structural schematic diagram of the utility model;

[0017] Figure 3 For the utility model Figure 1 The enlarged structural diagram at A in the middle;

[0018] Figure 4 It is a schematic diagram of the enlarged structure of the filter screen of the utility model;

[0019] Figure 5 For the utility model Figure 2 Enlarged structural diagram at B in the middle.

[0020] In the figure: 1. valve body; 2. valve chamber; 3. butterfly plate; 4. valve shaft; 5. liquid inlet; 6. filter screen; 601. annular sewage storage tank; 7. driver; 8. adjusting rod; 801. friction ridge; 9. hand wheel; 10. liquid outlet; 1001. drain hole; 11. baffle plate; 12. flow port; 13. backflow prevention plate; 14. sealing plug; 15. arc concave surface; 16. spring; 17. rotating shaft; 18. arc ferrule. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents the selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0022] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. All other embodiments obtained by ordinary technicians in the field without creative work based on the embodiments of the utility model shall fall within the scope of protection of the utility model.

[0023] See also Figure 1-5 The utility model provides an embodiment: a backflow prevention butterfly valve, comprising a valve body 1, a valve cavity 2, a butterfly plate 3, a baffle plate 11 and a backflow prevention plate 13, the valve cavity 2 is arranged inside the valve body 1, the butterfly plate 3 is installed inside the valve cavity 2, and a valve shaft 4 is fixedly installed inside the butterfly plate 3, a liquid inlet 5 is arranged at one end inside the valve body 1, and a liquid outlet 10 is arranged at the other end inside the valve body 1;

[0024] The baffle plate 11 is fixed at the connection between the liquid outlet 10 and the valve chamber 2, and the baffle plate 11 is provided with a flow port 12 inside.

[0025] The backflow prevention plate 13 is installed inside the liquid outlet 10 on one side of the baffle plate 11 through a spring 16, and a sealing plug 14 is adhered to the outer wall of the backflow prevention plate 13 close to the baffle plate 11, and the sealing plug 14 corresponds to the flow port 12 one by one;

[0026] Specifically, when liquid flows back, the force generated by the backflowing liquid pushes the anti-backflow plate 13 to overcome the elastic force of the spring 16 and move toward the blocking plate 11. The anti-backflow plate 13 drives the sealing plug 14 to get stuck in the flow port 12, and the flow port 12 is blocked to prevent the liquid from flowing back into the valve chamber 2, thereby playing the role of anti-backflow. The setting of the arc-shaped concave surface 15 is convenient for gathering force, so that the water flow pushes the anti-backflow plate 13 to move horizontally;

[0027] A drainage hole 1001 is provided on one side of the bottom of the valve chamber 2, and the drainage hole 1001 is connected to the liquid outlet 10;

[0028] Specifically, when the butterfly valve is in a closed state, the residual liquid in the valve cavity 2 flows out through the drain hole 1001 to prevent water accumulation in the valve cavity 2;

[0029] A driver 7 is installed at the top of the valve body 1, and an adjusting rod 8 is installed on one side of the driver 7, and a hand wheel 9 is installed at one end of the adjusting rod 8;

[0030] The liquid inlet 5 and the liquid outlet 10 are both connected to the valve chamber 2;

[0031] A filter screen 6 is installed inside the liquid inlet 5;

[0032] An annular dirt storage tank 601 is provided on the inner side wall of the filter screen 6;

[0033] Specifically, the filter screen 6 filters the liquid and filters out the particulate impurities inside the liquid. The particulate impurities roll down into the annular dirt storage tank 601 under the action of gravity, which is not easy to cause clogging of the filter screen 6. The setting of the filter screen 6 can intercept impurities, thereby preventing the valve chamber 2 from being blocked. The filter screen 6 can be removed separately for regular cleaning.

[0034] An arc-shaped concave surface 15 is provided on the outer wall of the backflow prevention plate 13 away from the sealing plug 14;

[0035] The outer wall of the adjusting rod 8 is provided with friction ridges 801;

[0036] An arc-shaped clamping sleeve 18 is installed on the outer wall of the driver 7 above the adjusting rod 8 through the rotating shaft 17, and the arc-shaped clamping sleeve 18 is tightly engaged with the friction convex ridge 801;

[0037] Specifically, when the butterfly valve is in the open or closed state for a long time, the arc-shaped sleeve 18 is flipped downward to rotate around the rotating shaft 17, and the arc-shaped sleeve 18 is tightly attached to the adjusting rod 8 and engages with the friction ridge 801. The arc-shaped sleeve 18 positions the adjusting rod 8, thereby preventing the adjusting rod 8 from rotating, and further preventing the butterfly plate 3 from loosening or deflecting, so that the butterfly valve is in the open or closed state for a long time without changing.

[0038] When the embodiment of the present application is in use: first, the adjusting rod 8 is rotated by the hand wheel 9 so that the valve shaft 4 drives the butterfly plate 3 to rotate, so as to control the opening and closing state of the butterfly valve. When the butterfly valve is in the open state, the liquid enters the valve cavity 2 from the liquid inlet 5, and then flows out from the liquid outlet 10. At this time, the filter screen 6 filters the liquid and filters out the particulate impurities inside it. The particulate impurities roll into the annular sewage storage tank 601 under the action of gravity, and are not easy to cause clogging of the filter screen 6. The setting of the filter screen 6 can intercept impurities, thereby preventing clogging of the valve cavity 2. The filter screen 6 can be disassembled and taken out separately for regular cleaning. Then, when there is liquid backflow, the force generated by the backflowing liquid pushes the anti-backflow plate 13 to overcome the elastic force of the spring 16 and move to the baffle plate 11, and the anti-backflow plate 13 drives the sealing The plug 14 is inserted into the flow port 12 to seal the flow port 12, which can prevent the liquid from flowing back into the valve chamber 2, thereby preventing backflow. The setting of the arc-shaped concave surface 15 is convenient for gathering force, and it is convenient for the water flow to push the anti-backflow plate 13 to move horizontally. When the butterfly valve is in the closed state, the residual liquid in the valve chamber 2 flows out through the drain hole 1001 to prevent water accumulation in the valve chamber 2. Finally, when the butterfly valve is in the open or closed state for a long time, the arc-shaped sleeve 18 is flipped downward to rotate around the rotating shaft 17, and the arc-shaped sleeve 18 is tightly attached to the adjusting rod 8 and engaged with the friction ridge 801. The arc-shaped sleeve 18 positions the adjusting rod 8, thereby preventing the adjusting rod 8 from rotating, and further preventing the butterfly plate 3 from loosening or deflecting, so that the butterfly valve is in the open or closed state for a long time without changing.

[0039] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

Claims

1. A backflow prevention butterfly valve, characterized in that: The invention comprises a valve body (1), a valve cavity (2), a butterfly plate (3), a baffle plate (11) and an anti-backflow plate (13), wherein the valve cavity (2) is arranged inside the valve body (1), the butterfly plate (3) is installed inside the valve cavity (2), and a valve shaft (4) is fixedly installed inside the butterfly plate (3), a liquid inlet (5) is arranged at one end inside the valve body (1), and a liquid outlet (10) is arranged at the other end inside the valve body (1), the baffle plate (11) is fixed at the connection between the liquid outlet (10) and the valve cavity (2), and a flow port (12) is arranged inside the baffle plate (11), and the anti-backflow plate (13) is fixedly installed inside the butterfly plate (3). The flow plate (13) is installed inside the liquid outlet (10) on one side of the baffle plate (11) via a spring (16), and a sealing plug (14) is adhered to the outer wall of the anti-backflow plate (13) on the side close to the baffle plate (11), and the sealing plug (14) corresponds to the flow port (12) one by one. A drainage hole (1001) is provided on one side of the bottom of the valve cavity (2), and the drainage hole (1001) is connected to the liquid outlet (10). A driver (7) is installed at the top of the valve body (1), and an adjusting rod (8) is installed on one side of the driver (7), and a hand wheel (9) is installed at one end of the adjusting rod (8).

2. The backflow prevention butterfly valve according to claim 1, characterized in that: The liquid inlet (5) and the liquid outlet (10) are both in communication with the valve chamber (2).

3. The backflow prevention butterfly valve according to claim 1, characterized in that: A filter screen (6) is installed inside the liquid inlet (5).

4. The backflow prevention butterfly valve according to claim 3, characterized in that: An annular dirt storage tank (601) is provided on the inner side wall of the filter screen (6).

5. The backflow prevention butterfly valve according to claim 1, characterized in that: An arc-shaped concave surface (15) is provided on the outer wall of the backflow prevention plate (13) on the side away from the sealing plug (14).

6. The backflow prevention butterfly valve according to claim 1, characterized in that: The outer wall of the adjusting rod (8) is provided with a friction ridge (801).

7. The backflow prevention butterfly valve according to claim 1, characterized in that: An arc-shaped clamping sleeve (18) is mounted on the outer wall of the driver (7) above the adjusting rod (8) via a rotating shaft (17), and the arc-shaped clamping sleeve (18) is tightly engaged with the friction ridge (801).

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