A butterfly valve with anti-backflow control

Abstract

This utility model relates to the field of butterfly valve technology and discloses a butterfly valve with anti-backflow control, including a valve body with flanges on the upper and lower sides. An anti-backflow mechanism is installed inside the valve body. The anti-backflow mechanism includes a handle, a rod, a butterfly plate, a spherical flow groove, a ball, a first horizontal rod, a vertical groove, a first telescopic rod, a spring, and a movable rod. The rod rotates through the valve body via a bearing. The handle is connected to the right end of the rod, and the butterfly plate is connected to the left end of the rod. The anti-backflow mechanism achieves bidirectional anti-backflow and butterfly plate protection, and the cooperation between the spring and the telescopic rod further improves sealing reliability. Rotating the handle causes the butterfly plate to seal the valve body, while the movable rod pulls the ball upward to seal the spherical flow groove, forming a double-blocking structure to prevent corrosive media from flowing back and contacting the butterfly plate. The spring automatically adjusts the ball's sealing pressure when the fluid pressure fluctuates, avoiding sealing failure due to reverse flow.

Description

Technical Field

[0001] This utility model relates to the field of butterfly valve technology, specifically a butterfly valve with anti-backflow control. Background Technology

[0002] In industrial pipeline systems, water supply and drainage projects, and energy transmission, butterfly valves have become commonly used valves for controlling fluid flow and regulating flow due to their advantages such as compact structure, low flow resistance, easy operation, and rapid opening and closing.

[0003] A butterfly valve disclosed in Chinese Patent Publication No. CN205956416U includes a valve body and a butterfly plate. The butterfly plate is connected to the valve body via a valve stem. A ceramic sealing ring is disposed within the valve body, and a ceramic sealing ring is disposed on the butterfly plate that abuts against the ceramic sealing ring. A PTFE sealing ring is disposed in the center of the ceramic sealing ring. Through this arrangement, PTFE, with its high chemical inertness, stable main chain, resistance to reagent attack, good chemical resistance, good temperature resistance, low viscosity, and high lubricity, is positioned centrally to contact the ceramic sealing ring. Due to its excellent lubricity, it facilitates the opening and closing of the butterfly plate, reducing wear from the rigid contact between the ceramic components. Simultaneously, the PTFE sealing ring exhibits high sealing performance, effectively preventing gas and liquid leakage between the ceramic sealing ring and the ceramic sealing ring. Furthermore, both the ceramic sealing ring and the ceramic sealing ring have a long service life. With improved sealing performance and wear resistance, the butterfly valve has an even longer service life.

[0004] However, this butterfly valve cannot prevent liquid backflow. If the liquid is corrosive, the continuously flowing back liquid may corrode the butterfly valve, thus causing leakage. Therefore, a butterfly valve with anti-backflow control is proposed to solve the above-mentioned problems. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a butterfly valve with anti-backflow control, which addresses the shortcomings of the prior art.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a butterfly valve with anti-backflow control, including a valve body, flanges on the upper and lower sides of the valve body, and an anti-backflow mechanism inside the valve body; the anti-backflow mechanism includes a handle, a rod, a butterfly plate, a spherical flow groove, a ball, a first horizontal rod, a vertical groove, a first telescopic rod, a spring, and a movable rod; the rod rotates through the valve body via a bearing, the handle is connected to the right end of the rod, the butterfly plate is connected to the left end of the rod, the butterfly plate is in contact with the inner wall of the valve body, the spherical flow groove is located in the middle of the valve body, the ball is located inside the spherical flow groove, the bottom end of the butterfly plate is hinged to the movable rod, and the bottom end of the movable rod is hinged to the ball.

[0007] Preferably, the two ends of the first crossbar are connected to the inner wall of the valve body, and the bottom end of the first telescopic rod is connected to the top of the first crossbar.

[0008] Preferably, the bottom of the sphere has a vertical groove, the top end of the first telescopic rod is connected to the top inner wall of the vertical groove, the spring is sleeved on the outside of the first telescopic rod, the top end of the spring is connected to the sphere, and the bottom end of the spring is connected to the first crossbar.

[0009] Preferably, the sphere and valve body are coated with anti-corrosion paint, the diameter of the sphere is larger than the inner diameter of the valve body, and the diameter of the sphere is smaller than the diameter of the spherical flow groove.

[0010] Preferably, a cleaning mechanism is provided at the bottom of the first crossbar. The cleaning mechanism includes a vertical bar, the top of which is connected to a ball. A second crossbar is connected to the bottom of the vertical bar, and a second telescopic bar is connected to the top of the second crossbar. The top of the second telescopic bar is connected to the first crossbar.

[0011] Preferably, the second crossbar is connected to a ring, the outer wall of the ring is connected to bristles, and the bristles are connected to the inner wall of the valve body.

[0012] The present invention adopts the above technical solution, which can bring the following beneficial effects:

[0013] 1. By incorporating an anti-backflow mechanism, the system achieves both bidirectional anti-backflow and butterfly plate protection. Furthermore, the combination of the spring and telescopic rod further enhances sealing reliability. Rotating the handle causes the butterfly plate to seal the valve body, while the movable rod pulls the ball upwards to seal the spherical flow groove, forming a double-blocking structure to prevent corrosive media from flowing back and contacting the butterfly plate. The spring automatically adjusts the ball's sealing pressure when fluid pressure fluctuates, preventing seal failure due to reverse flow.

[0014] 2. The cleaning mechanism automatically removes impurities from the valve body, and the ball-and-ball linkage design further improves the efficiency of pipeline maintenance and ensures unobstructed flow. When the ball moves upward, the vertical rod drives the circular brush to scrape off particulate impurities adhering to the inner wall of the valve body. The second telescopic rod provides a buffer when the ball returns to its original position, ensuring that the brush bristles remain in contact with the inner wall. This structure operates synchronously with the valve opening and closing, requiring no additional power and reducing the frequency of manual cleaning and the risk of pipeline blockage. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0017] Figure 3 This is a schematic diagram of the internal structure of the spherical region in this utility model.

[0018] In the diagram: 1. Valve body; 2. Flange; 3. Anti-backflow mechanism; 4. Cleaning mechanism; 301. Rotary handle; 302. Rotary rod; 303. Butterfly plate; 304. Spherical flow channel; 305. Ball; 306. First horizontal bar; 307. Vertical groove; 308. First telescopic rod; 309. Spring; 3010. Movable rod; 401. Vertical rod; 402. Ring; 403. Brush bristles; 404. Second horizontal bar; 405. Second telescopic rod. Detailed Implementation

[0019] 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.

[0020] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "several" means two or more, unless otherwise explicitly specified.

[0023] Please see Figure 1-3One embodiment of this utility model is as follows: a butterfly valve with anti-backflow control includes a valve body 1, flanges 2 are provided on the upper and lower sides of the valve body 1, and an anti-backflow mechanism 3 is provided inside the valve body 1; the anti-backflow mechanism 3 includes a handle 301, a rod 302, a butterfly plate 303, a spherical flow groove 304, a ball 305, a first horizontal rod 306, a vertical groove 307, a first telescopic rod 308, a spring 309, and a movable rod 3010; the rod 302 rotates through the valve body 1 via a bearing, the handle 301 is connected to the right end of the rod 302, the butterfly plate 303 is connected to the left end of the rod 302, the butterfly plate 303 is in contact with the inner wall of the valve body 1, the spherical flow groove 305 is provided in the middle of the valve body 1, the ball 305 is provided inside the spherical flow groove 305, the bottom end of the butterfly plate 303 is hinged to the movable rod 3010, and the bottom end of the movable rod 3010 is hinged to the ball 305.

[0024] The two ends of the first crossbar 306 are connected to the inner wall of the valve body 1, and the bottom end of the first telescopic rod 308 is connected to the top of the first crossbar 306.

[0025] The bottom of the sphere 305 is provided with a vertical groove 307. The top end of the first telescopic rod 308 is connected to the top inner wall of the vertical groove 307. The spring 309 is sleeved on the outside of the first telescopic rod 308. The top end of the spring 309 is connected to the sphere 305, and the bottom end of the spring 309 is connected to the first crossbar 306.

[0026] The ball 305 and the valve body 1 are coated with anti-corrosion paint. The diameter of the ball 305 is larger than the inner diameter of the valve body 1, and the diameter of the ball 305 is smaller than the diameter of the spherical flow groove 304.

[0027] Working principle: When it is necessary to close the valve body 1, first turn the handle 301 to drive the rod 302 and the butterfly plate 303 to rotate. After the butterfly plate 303 rotates 90 degrees, it seals the inside of the valve body 1. The rotation of the butterfly plate 303 drives the ball 305 to move upward through the first telescopic rod 308, and seals the top of the spherical flow groove 304, thereby preventing corrosive liquid from coming back up and contacting the butterfly plate 303 and causing corrosion.

[0028] Please see Figure 1-3 Based on the above embodiments, in another embodiment of the present invention, a cleaning mechanism 4 is provided at the bottom of the first crossbar 306. The cleaning mechanism 4 includes a vertical bar 401, the top end of the vertical bar 401 is connected to the ball 305, the bottom end of the vertical bar 401 is connected to a second crossbar 404, the top end of the second crossbar 404 is connected to a second telescopic bar 405, and the top end of the second telescopic bar 405 is connected to the first crossbar 306.

[0029] The second crossbar 404 is connected to the ring 402. The outer wall of the ring 402 is connected to the bristles 403, and the bristles 403 are connected to the inner wall of the valve body 1.

[0030] Working principle: As the ball 305 moves upward, it drives the vertical rod 401 to move upward. The upward movement of the vertical rod 401 drives the second horizontal rod 404 to move upward, while simultaneously compressing the second telescopic rod 405. The upward movement of the second horizontal rod 404 drives the ring 402 to move upward. The upward movement of the ring 402 drives the brush bristles 403 to move upward, scraping away impurities attached to the inner wall of the valve body 1, thereby improving the smoothness of the valve body 1.

[0031] This utility model provides a butterfly valve with anti-backflow control. There are many methods and approaches to implement this technical solution. The above description is only a preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model. All components not explicitly stated in this embodiment can be implemented using existing technology.

Claims

1. A butterfly valve with anti-backflow control, characterized in that: A butterfly valve with anti-backflow control includes a valve body (1), flanges (2) on the upper and lower sides of the valve body (1), and an anti-backflow mechanism (3) inside the valve body (1); the anti-backflow mechanism (3) includes a handle (301), a rod (302), a butterfly plate (303), a spherical flow groove (304), a ball (305), a first horizontal rod (306), a vertical groove (307), a first telescopic rod (308), a spring (309), and a movable rod (3010); the rod (302) is connected to the valve body via a shaft. The valve body (1) is rotated through the valve. The handle (301) is connected to the right end of the rotating rod (302). The butterfly plate (303) is connected to the left end of the rotating rod (302). The butterfly plate (303) is in contact with the inner wall of the valve body (1). The spherical flow groove (304) is located in the middle of the valve body (1). The ball (305) is located inside the spherical flow groove (304). The bottom end of the butterfly plate (303) is hinged to the movable rod (3010). The bottom end of the movable rod (3010) is hinged to the ball (305).

2. A butterfly valve with anti-backflow control according to claim 1, characterized in that: The two ends of the first crossbar (306) are connected to the inner wall of the valve body (1), and the bottom end of the first telescopic rod (308) is connected to the top of the first crossbar (306).

3. A butterfly valve with anti-backflow control according to claim 2, characterized in that: The bottom of the sphere (305) is provided with a vertical groove (307). The top end of the first telescopic rod (308) is connected to the top inner wall of the vertical groove (307). The spring (309) is sleeved on the outside of the first telescopic rod (308). The top end of the spring (309) is connected to the sphere (305), and the bottom end of the spring (309) is connected to the first crossbar (306).

4. A butterfly valve with anti-backflow control according to claim 3, characterized in that: The ball (305) and the valve body (1) are coated with anti-corrosion paint. The diameter of the ball (305) is larger than the inner diameter of the valve body (1), and the diameter of the ball (305) is smaller than the diameter of the spherical flow groove (304).

5. A butterfly valve with anti-backflow control according to claim 4, characterized in that: A cleaning mechanism (4) is provided at the bottom of the first crossbar (306). The cleaning mechanism (4) includes a vertical bar (401). The top end of the vertical bar (401) is connected to the ball (305). The bottom end of the vertical bar (401) is connected to a second crossbar (404). The top end of the second crossbar (404) is connected to a second telescopic bar (405). The top end of the second telescopic bar (405) is connected to the first crossbar (306).

6. A butterfly valve with anti-backflow control according to claim 5, characterized in that: The second crossbar (404) is connected to a ring (402), and the outer wall of the ring (402) is connected to bristles (403), which are connected to the inner wall of the valve body (1).

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