Leakage-proof electric butterfly valve

Abstract

The invention relates to the technical field of electric butterfly valves, and discloses an anti-leakage electric butterfly valve which comprises a valve body and a driving motor, one end of the valve body is a feeding end, the other end of the valve body is a discharging end, a valve body shaft sleeve is arranged in the center of the top of the valve body, a top plate is arranged at the top end of the valve body shaft sleeve, and the driving motor is arranged at the top of the top plate. According to the butterfly valve, when the butterfly valve is completely closed, the positioning rotating rod is pressed downwards, the positioning teeth at the end of the positioning rotating rod are clamped in the tooth gaps of the positioning fluted disc again, rotation of the valve rod is limited, and the butterfly valve is not prone to falling off. The anti-leakage effect of the whole electric butterfly valve is further improved in cooperation with friction of the butterfly plate and self-locking of the driving motor; the semi-ring sealing ring applies pressure to the valve body sealing ring, so that the friction force between the butterfly plate and the valve body sealing ring is improved, and the leakage-proof effect of the whole butterfly valve is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of electric butterfly valves, in particular to an anti-leakage electric butterfly valve. Background Art

[0002] The electric butterfly valve is a valve that uses a circular butterfly plate as a start and stop part and rotates with the valve stem to open, close and adjust the fluid channel. The butterfly plate of the electric butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical channel of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis, and the rotation angle is usually between 0°-90°. When the butterfly plate rotates to 90°, the valve is in a fully open state; when it rotates to 0°, it is in a fully closed state. The electric butterfly valve is usually composed of an angular stroke electric actuator and a butterfly valve body. The angular stroke electric actuator provides power to enable the butterfly plate to rotate around its axis, thereby realizing the opening, closing and adjustment functions of the valve.

[0003] The existing Chinese patent (CN207777641U) discloses an electric butterfly valve, which includes an outer ring, an inner ring, a sealing ring, a valve stem and a valve plate. When the electric butterfly valve of the utility model is used, the pipeline to be connected is inserted into the sealing ring, and the distance between the first fixing part and the second fixing part is reduced by bolts, so that the inner ring slides along the side wall of the outer ring, squeezing the sealing ring so that the sealing ring seals the pipeline to be connected; at the same time, when the electric butterfly valve is used many times and the seal between the valve plate and the sealing ring deteriorates, tightening the bolts here can reduce the radial size of the sealing ring, re-form a good seal, and thereby increase the service life of the butterfly valve.

[0004] When the existing electric butterfly valve is in the closed state, it mainly relies on the friction of the disc plate and the self-locking mechanism of the motor to maintain its closed position. However, in actual applications, especially when facing high fluid pressure, the fluid pressure may be strong enough to overcome the self-locking force of the motor or the friction between the disc plate and the valve seat, causing the disc plate to rotate slightly. Although this tiny displacement is not large, it is enough to destroy the originally tight sealing state and cause leakage. Summary of the invention

[0005] The object of the present invention is to provide a leakage-proof electric butterfly valve to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a leakage-proof electric butterfly valve, comprising: a valve body and a driving motor, one end of the valve body is a feed end, and the other end is a discharge end, a valve body sleeve is provided in the center of the top of the valve body, a top plate is provided at the top of the valve body sleeve, a driving motor is provided on the top of the top plate, a valve stem is provided at the bottom end of the output shaft of the driving motor, disc plates are provided on both sides of the outer wall of the valve stem, a positioning gear disk is fixed to the outer wall of the upper half of the valve stem, a fixing rod is provided on one side of the outer wall of the driving motor, a positioning rotating rod is rotatably provided at the bottom of one end of the fixing rod, a positioning tooth is provided at one end of the positioning rotating rod, and the outer contour of the positioning tooth is consistent with the tooth gap contour of the positioning tooth disk.

[0007] As a further explanation of the present invention, an elastic rubber pad is provided on the side of the valve stem close to the feed end, a pressure plate is fixed on one side of the elastic rubber pad, an elastic sheet is fixed on the outer wall of the pressure plate, a semi-ring sealing ring is provided at one end of the elastic sheet, and the outer wall contour of the semi-ring sealing ring is consistent with the outer wall contour of the disc plate.

[0008] As a further explanation of the present invention, a limit strip is provided on the side of the disc plate close to the feed end, the limit strip is located outside the semi-ring sealing ring, the limit strip is L-shaped, one end of the limit strip is fixed to the disc plate, and the other end of the limit strip is located above one side of the semi-ring sealing ring.

[0009] As a further explanation of the present invention, a spring is provided on one side of the bottom of the fixing rod, the bottom end of the spring is connected to the positioning rotating rod, and the spring is always in a compressed state.

[0010] As a further explanation of the present invention, an electromagnet is provided on one side of the bottom of the fixing rod, and a magnetic attraction rod is provided on one side of the top of the positioning rotating rod, and the magnetic conductive surfaces of the electromagnet and the magnetic attraction rod are facing each other.

[0011] As a further illustration of the present invention, an external joint is provided on one side of the outer wall of the feed end, and the external joint is used to connect to the pressure pipe.

[0012] As a further explanation of the present invention, a valve body sealing ring is provided on the inner wall of the valve body located outside the disc plate, and the inner wall of the valve body sealing ring is in contact with the outer wall of the disc plate.

[0013] As a further description of the present invention, there are a plurality of elastic sheets, and the plurality of elastic sheets are evenly arranged circumferentially on the pressure plate.

[0014] As a further description of the present invention, there are a plurality of limit strips, and the plurality of limit strips are evenly arranged in the circumferential direction on the disc plate.

[0015] As a further illustration of the present invention, the pressure plate is located at the center of the valve body close to the feed end.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention realizes that when the leakage-proof electric butterfly valve is used, the valve stem fixedly connected to the output shaft is driven by the driving motor to rotate, which drives the disc plate to rotate, thereby realizing the opening or closing of the butterfly valve. During the rotation of the valve stem, the positioning toothed disc fixed to the valve stem rotates accordingly. At this time, the positioning rotating rod is in an upward state, and the positioning teeth of the positioning rotating rod are in a separated state from the positioning toothed disc. When the butterfly valve is fully closed, the positioning rotating rod is pressed down, and the positioning teeth at the end of the positioning rotating rod are re-stuck between the tooth gaps of the positioning toothed disc, thereby limiting the rotation of the valve stem. In combination with the friction of the disc plate and the self-locking of the driving motor, the leakage-proof effect of the entire electric butterfly valve is further improved. In addition, when the butterfly valve is in a closed state and the fluid at one end of the feed end is still under pressure, the fluid will exert pressure on the pressure plate, causing the pressure plate to compress the elastic rubber pad and move toward the side of the valve stem. The displacement of the pressure plate will cause the elastic sheet to produce outward pressure, causing the semi-ring sealing ring to exert pressure on the valve body sealing ring, thereby increasing the friction between the disc plate and the valve body sealing ring, and further improving the anti-leakage effect of the entire butterfly valve.

[0017] The parts not involved in the device are the same as those in the prior art or can be implemented by using the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A three-dimensional diagram of an anti-leakage electric butterfly valve of the present invention; Figure 2 A three-dimensional diagram of a leakage-proof electric butterfly valve of the present invention from another perspective; Figure 3 This is a front view of an anti-leakage electric butterfly valve of the present invention; Figure 4 It is a left view of an anti-leakage electric butterfly valve of the present invention; Figure 5 It is a right sectional view of an anti-leakage electric butterfly valve of the present invention; Figure 6 for Figure 5 The enlarged structural diagram at A in the middle; Figure 7 It is a main cross-sectional view of an anti-leakage electric butterfly valve of the present invention; Figure 8 It is a schematic diagram of the internal structure of an anti-leakage electric butterfly valve of the present invention; Fig. 9 for Figure 8 The enlarged structural diagram at B in the middle; Fig.10 for Figure 8 Enlarged structural diagram at point C in the middle.

[0019] In the figure: 1. valve body; 2. feed end; 3. discharge end; 4. valve body shaft sleeve; 5. top plate; 6. drive motor; 7. positioning gear disc; 8. fixing rod; 9. positioning rotating rod; 10. spring; 11. electromagnet; 12. magnetic iron rod; 13. valve stem; 14. disc plate; 15. pressure plate; 16. elastic sheet; 17. semi-ring sealing ring; 18. limit strip; 19. elastic rubber pad; 20. external joint; 21. valve body sealing ring. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] Example 1: Please refer to Figure 1-Figure 5 The present invention provides a technical solution: a leakage-proof electric butterfly valve, comprising: a valve body 1 and a driving motor 6, one end of the valve body 1 is a feed end 2, and the other end is a discharge end 3. The valve body 1 serves as the main structure of the butterfly valve, and the valve body 1 is responsible for connecting the pipeline system and accommodating all other components. One end of the valve body 1 is a feed end 2 for receiving fluid; the other end is a discharge end 3 for outputting fluid. The design of the valve body 1 ensures the smooth flow of the fluid and provides sufficient strength and sealing to withstand the working pressure of the pipeline system. A valve body sleeve 4 is provided at the top center of the valve body 1. The valve body sleeve 4 is located at the top center of the valve body 1 and is used to support the rotation of the valve stem 13 to ensure the stability and accuracy of the valve stem during the rotation process. The design of the valve body sleeve 4 reduces the friction between the valve stem and the valve body, prolongs the service life of the valve stem, and improves the overall sealing performance of the butterfly valve.

[0022] A top plate 5 is provided at the top of the valve body sleeve 4. The top plate 5 is installed at the top of the valve body sleeve 4 to provide a mounting platform for the drive motor 6 and protect the drive motor from interference from the external environment. The design of the top plate 5 ensures the stability and safety of the drive motor, while facilitating installation and maintenance. A drive motor 6 is provided on the top of the top plate 5. The drive motor 6 is the power source of the butterfly valve. It is fixedly connected to the valve stem 13 through the output shaft, thereby driving the rotation of the valve stem and the disc plate. The drive motor 6 provides precise and reliable power to ensure the fast and smooth opening and closing of the butterfly valve. At the same time, its self-locking function helps to maintain the current state of the butterfly valve when the power is off, preventing accidental opening or closing.

[0023] A valve stem 13 is provided at the bottom end of the output shaft of the driving motor 6, and disc plates 14 are provided on both sides of the outer wall of the valve stem 13. The valve stem 13 is a key component connecting the driving motor and the disc plate, and is responsible for transmitting the rotational motion of the motor to the disc plate, thereby realizing the opening and closing of the butterfly valve. The design of the valve stem 13 ensures the smooth and accurate rotation of the disc plate, and at the same time can withstand the torque and pressure generated by the butterfly valve during the opening and closing process. The disc plate 14 is the opening and closing part of the butterfly valve, which rotates around the center line of the valve stem to control the on and off of the fluid.

[0024] A positioning toothed disc 7 is fixed on the outer wall of the upper half of the valve stem 13, and a fixing rod 8 is provided on one side of the outer wall of the driving motor 6. A positioning rotating rod 9 is rotatably provided at the bottom of one end of the fixing rod 8. A positioning tooth is provided at one end of the positioning rotating rod 9, and the outer contour of the positioning tooth is consistent with the tooth gap contour of the positioning toothed disc 7. The positioning toothed disc 7 is fixed on the outer wall of the upper half of the valve stem 13, and cooperates with the positioning tooth of the positioning rotating rod 9, and is used to limit the rotation of the valve stem when the butterfly valve is fully closed. The design of the positioning toothed disc 7 ensures the stability and accuracy of the butterfly valve in the closed state, and prevents the problem of slight rotation and leakage of the disc plate caused by fluid pressure. The fixing rod 8 is provided on one side of the outer wall of the driving motor 6, and is used to support the positioning rotating rod 9. A positioning tooth is provided at one end of the positioning rotating rod 9, and cooperates with the tooth gap of the positioning toothed disc 7, and is used to lock the position of the valve stem when the butterfly valve is fully closed. The design of the positioning rotating rod 9 enhances the anti-leakage performance of the butterfly valve, and ensures the long-term stability and sealing of the butterfly valve in the closed state.

[0025] When the leakage-proof electric butterfly valve is in use, the valve stem 13 fixedly connected to its output shaft is driven to rotate by the driving motor 6, thereby driving the disc plate 14 to rotate, thereby realizing the opening or closing of the butterfly valve. During the rotation of the valve stem 13, the positioning gear plate 7 fixed to the valve stem 13 rotates accordingly. At this time, the positioning rotating rod 9 is in an upward state, and the positioning teeth of the positioning rotating rod 9 are in a separated state from the positioning gear plate 7. When the butterfly valve is fully closed, the positioning rotating rod 9 is pressed down, and the positioning teeth at the end of the positioning rotating rod 9 are re-stuck between the tooth gaps of the positioning gear plate 7, thereby limiting the rotation of the valve stem 13. Combined with the friction of the disc plate 14 and the self-locking of the driving motor 6, the leakage-proof effect of the entire electric butterfly valve is further improved.

[0026] Example 2: Please refer to Figure 1-Figure 8 , Fig.10The present invention provides a technical solution: a leakage-proof electric butterfly valve, comprising: a valve body 1 and a driving motor 6, one end of the valve body 1 is a feed end 2, and the other end is a discharge end 3. The valve body 1 serves as the main structure of the butterfly valve, and the valve body 1 is responsible for connecting the pipeline system and accommodating all other components. One end of the valve body 1 is a feed end 2 for receiving fluid; the other end is a discharge end 3 for outputting fluid. The design of the valve body 1 ensures the smooth flow of the fluid and provides sufficient strength and sealing to withstand the working pressure of the pipeline system. A valve body sleeve 4 is provided at the top center of the valve body 1. The valve body sleeve 4 is located at the top center of the valve body 1 and is used to support the rotation of the valve stem 13 to ensure the stability and accuracy of the valve stem during the rotation process. The design of the valve body sleeve 4 reduces the friction between the valve stem and the valve body, prolongs the service life of the valve stem, and improves the overall sealing performance of the butterfly valve.

[0027] A top plate 5 is provided at the top of the valve body sleeve 4. The top plate 5 is installed at the top of the valve body sleeve 4 to provide a mounting platform for the drive motor 6 and protect the drive motor from interference from the external environment. The design of the top plate 5 ensures the stability and safety of the drive motor, while facilitating installation and maintenance. A drive motor 6 is provided on the top of the top plate 5. The drive motor 6 is the power source of the butterfly valve. It is fixedly connected to the valve stem 13 through the output shaft, thereby driving the rotation of the valve stem and the disc plate. The drive motor 6 provides precise and reliable power to ensure the fast and smooth opening and closing of the butterfly valve. At the same time, its self-locking function helps to maintain the current state of the butterfly valve when the power is off, preventing accidental opening or closing.

[0028] A valve stem 13 is provided at the bottom end of the output shaft of the driving motor 6, and disc plates 14 are provided on both sides of the outer wall of the valve stem 13. The valve stem 13 is a key component connecting the driving motor and the disc plate, and is responsible for transmitting the rotational motion of the motor to the disc plate, thereby realizing the opening and closing of the butterfly valve. The design of the valve stem 13 ensures the smooth and accurate rotation of the disc plate, and at the same time can withstand the torque and pressure generated by the butterfly valve during the opening and closing process. The disc plate 14 is the opening and closing part of the butterfly valve, which rotates around the center line of the valve stem to control the on and off of the fluid.

[0029] A positioning toothed disc 7 is fixed on the outer wall of the upper half of the valve stem 13, and a fixing rod 8 is provided on one side of the outer wall of the driving motor 6. A positioning rotating rod 9 is rotatably provided at the bottom of one end of the fixing rod 8. A positioning tooth is provided at one end of the positioning rotating rod 9, and the outer contour of the positioning tooth is consistent with the tooth gap contour of the positioning toothed disc 7. The positioning toothed disc 7 is fixed on the outer wall of the upper half of the valve stem 13, and cooperates with the positioning tooth of the positioning rotating rod 9, and is used to limit the rotation of the valve stem when the butterfly valve is fully closed. The design of the positioning toothed disc 7 ensures the stability and accuracy of the butterfly valve in the closed state, and prevents the problem of slight rotation and leakage of the disc plate caused by fluid pressure. The fixing rod 8 is provided on one side of the outer wall of the driving motor 6, and is used to support the positioning rotating rod 9. A positioning tooth is provided at one end of the positioning rotating rod 9, and cooperates with the tooth gap of the positioning toothed disc 7, and is used to lock the position of the valve stem when the butterfly valve is fully closed. The design of the positioning rotating rod 9 enhances the anti-leakage performance of the butterfly valve, and ensures the long-term stability and sealing of the butterfly valve in the closed state.

[0030] When the leakage-proof electric butterfly valve is in use, the valve stem 13 fixedly connected to its output shaft is driven to rotate by the driving motor 6, thereby driving the disc plate 14 to rotate, thereby realizing the opening or closing of the butterfly valve. During the rotation of the valve stem 13, the positioning gear plate 7 fixed to the valve stem 13 rotates accordingly. At this time, the positioning rotating rod 9 is in an upward state, and the positioning teeth of the positioning rotating rod 9 are in a separated state from the positioning gear plate 7. When the butterfly valve is fully closed, the positioning rotating rod 9 is pressed down, and the positioning teeth at the end of the positioning rotating rod 9 are re-stuck between the tooth gaps of the positioning gear plate 7, thereby limiting the rotation of the valve stem 13. Combined with the friction of the disc plate 14 and the self-locking of the driving motor 6, the leakage-proof effect of the entire electric butterfly valve is further improved.

[0031] Please also read Figure 6 In this embodiment, an elastic rubber pad 19 is provided on the side of the valve stem 13 close to the feed end 2. In addition, when the butterfly valve is in a closed state and the fluid at one end of the feed end 2 is still in a pressurized state, the fluid will generate pressure on the pressure plate 15, so that the pressure plate 15 will compress the elastic rubber pad 19 to move toward the side of the valve stem 13. The elastic rubber pad 19 provides support for the pressure plate 15 while providing elastic deformation space for the displacement of the pressure plate 15.

[0032] A pressure plate 15 is fixed on one side of the elastic rubber pad 19. The solid design of the pressure plate 15 can withstand the high pressure of the fluid, ensuring that the elastic rubber pad and the semi-ring seal can work normally. At the same time, the displacement of the pressure plate 15 can trigger the subsequent sealing enhancement mechanism to improve the anti-leakage effect of the butterfly valve. An elastic sheet 16 is fixed to the outer wall of the pressure plate 15, and a semi-ring seal 17 is provided at one end of the elastic sheet 16. The elastic sheet 16 is fixed to the outer wall of the pressure plate 15 to convert the displacement of the pressure plate into pressure on the semi-ring seal. The tight fit of the semi-ring seal 17 can ensure a leak-free connection between the disc plate and the valve body in the closed state. When the fluid applies pressure to the pressure plate 15, the semi-ring seal 17 can apply pressure to the valve body seal 21, increase the friction between the disc plate and the valve body seal, and thus improve the anti-leakage effect of the butterfly valve. When the pressure plate 15 is displaced by the fluid pressure, the elastic sheet 16 can undergo elastic deformation and evenly transfer the pressure to the semi-ring seal. This design not only improves the flexibility of the seal, but also maintains a stable sealing effect under different pressure conditions. The outer wall contour of the semi-ring seal 17 matches the outer wall contour of the disc plate 14. In addition, when the butterfly valve is in a closed state and the fluid at one end of the feed end 2 is still under pressure, the fluid will exert pressure on the pressure plate 15, so that the pressure plate 15 will compress the elastic rubber pad 19 to move toward the valve stem 13, and the displacement of the pressure plate 15 will cause the elastic sheet 16 to produce pressure outward, so that the semi-ring seal 17 applies pressure to the valve body seal 21, thereby increasing the friction between the disc plate 14 and the valve body seal 21, and further improving the anti-leakage effect of the entire butterfly valve.

[0033] The inner wall of the valve body 1 is provided with a valve body sealing ring 21 on the outer side of the disc plate 14, and the inner wall of the valve body sealing ring 21 is in contact with the outer wall of the disc plate 14. A limiting strip 18 is provided on the side of the disc plate 14 close to the feed end 2, and the limiting strip 18 is located on the outer side of the semi-ring sealing ring 17. The limiting strip 18 is L-shaped, and one end of the limiting strip 18 is fixed to the disc plate 14, and the other end of the limiting strip 18 is located above one side of the semi-ring sealing ring 17. The main function of the limiting strip 18 is to ensure that the semi-ring sealing ring 17 can only move to the side of the valve body sealing ring 21 when under pressure. This restriction effectively prevents the semi-ring sealing ring 17 from warping or deflecting under fluid pressure, thereby maintaining the stability and reliability of the seal. By limiting the movement of the semi-ring sealing ring 17, the limiting strip 18 further enhances the sealing performance of the butterfly valve. It ensures the close fit between the semi-ring sealing ring 17 and the valve body sealing ring 21, and can maintain a stable sealing effect even under high pressure conditions. The limiting strip 18 also plays a role in protecting the semi-ring sealing ring 17. By limiting its range of movement, the friction and wear between the semi-ring seal 17 and the valve body or other components are reduced, thereby extending the service life of the semi-ring seal. During the opening and closing process of the butterfly valve, the limit strip 18 can maintain the stable position of the semi-ring seal 17 to prevent it from shifting due to vibration or impact. This helps to improve the overall stability and reliability of the butterfly valve.

[0034] There are multiple elastic sheets 16, and the multiple elastic sheets 16 are evenly arranged circumferentially on the pressure plate 15. The multiple elastic sheets 16 are evenly arranged circumferentially on the pressure plate 15 to ensure that under fluid pressure, the pressure plate 15 can evenly transfer pressure to the semi-ring seal ring 17, thereby avoiding sealing failure caused by excessive local pressure.

[0035] There are multiple limiting strips 18, and the multiple limiting strips 18 are evenly arranged circumferentially on the disc plate 14. The multiple limiting strips 18 are evenly arranged circumferentially on the disc plate 14 to ensure that the semi-ring seal ring 17 can be evenly and stably restricted when under pressure to prevent it from uneven displacement or warping.

[0036] The pressure plate 15 is located at the center of the valve body 1, close to the feed end 2. The pressure plate 15 is located at the center of the valve body 1, close to the feed end 2. This position design enables the pressure plate 15 to more effectively transfer pressure to subsequent sealing components, such as the elastic rubber pad 19, the elastic sheet 16 and the semi-ring seal 17 when subjected to fluid pressure. The pressure plate 15 is located at the center of the valve body, close to the feed end, so that the force is more uniform. This helps to ensure that the elastic rubber pad 19 and the semi-ring seal 17 can deform evenly when subjected to pressure, thereby improving the uniformity and stability of the seal. By uniformly applying force, the pressure plate 15 can more effectively transfer the fluid pressure to the semi-ring seal 17, making it fit more closely to the valve body seal 21, thereby enhancing the sealing performance of the butterfly valve.

[0037] A spring 10 is provided on one side of the bottom of the fixed rod 8, and the bottom end of the spring 10 is connected to the positioning rotating rod 9, and the spring 10 is always in a compressed state. An electromagnet 11 is provided on one side of the bottom of the fixed rod 8, and a magnetic iron rod 12 is provided on one side of the top of the positioning rotating rod 9, and the magnetic conductive surfaces of the electromagnet 11 and the magnetic iron rod 12 are facing each other. When the opening angle of the butterfly valve needs to be adjusted, the electromagnet 11 is energized to generate magnetic force to attract the magnetic iron rod 12, so that the positioning rotating rod 9 is lifted up, the positioning teeth are separated from the positioning gear disc, and the butterfly valve can rotate freely. After the opening angle of the butterfly valve is adjusted to the desired position, the electromagnet 11 is de-energized. At this time, the spring 10 quickly releases the compression energy, pushes the positioning rotating rod 9 downward, and the positioning teeth are accurately stuck between the tooth gaps of the positioning gear disc, and the butterfly valve is firmly locked.

[0038] The entire system achieves precise lifting and pressing of the positioning rod through the magnetic attraction of the electromagnet and the elastic force of the spring, ensuring the stability and accuracy of the butterfly valve during the opening angle adjustment process. At the same time, the constant compression state of the spring also provides a solid guarantee for the locking of the butterfly valve.

[0039] When manufacturing the positioning toothed disc, it is necessary to accurately measure the opening angle of the butterfly valve, and design and manufacture the tooth gap angle of the positioning toothed disc based on the measurement results. This can ensure the compatibility of the positioning toothed disc and the butterfly valve. By adapting the tooth gap angle of the positioning toothed disc and the opening angle of the butterfly valve, it can be ensured that the butterfly valve can reach the predetermined position every time it is opened or closed. This precise positioning helps to avoid fluid leakage or inaccurate control caused by position deviation of the butterfly valve.

[0040] Example 3: Please refer to Figure 1-Figure 10 The present invention provides a technical solution: a leakage-proof electric butterfly valve. The remaining technical solutions in this embodiment are the same as those in the second embodiment, except that: An external connector 20 is provided on one side of the outer wall of the feed end 2, and the external connector 20 is used to connect the pressure pipe. The external connector 20 is used to connect the pressure pipe, and the pressure on the feed end side can be increased by passing the pressure fluid into the valve body. This design enables the butterfly valve to adjust the pressure when necessary to adapt to different working conditions. When higher sealing performance is required, additional pressure fluid can be passed into the valve body through the external connector 20 to increase the pressure on the feed end side. This helps to make the semi-ring seal 17 fit the valve body seal 21 more closely, thereby improving the anti-leakage effect of the butterfly valve.

[0041] When the leakage-proof electric butterfly valve is in use, the valve stem 13 fixedly connected to the output shaft is driven by the driving motor 6 to rotate, which drives the disc plate 14 to rotate, thereby realizing the opening or closing of the butterfly valve. During the rotation of the valve stem 13, the positioning toothed disc 7 fixed to the valve stem 13 rotates accordingly. At this time, the positioning rotating rod 9 is in an upward state, and the positioning teeth of the positioning rotating rod 9 are in a separated state from the positioning toothed disc 7. When the butterfly valve is fully closed, the positioning rotating rod 9 is pressed down, and the positioning teeth at the end of the positioning rotating rod 9 are re-stuck between the tooth gaps of the positioning toothed disc 7, thereby limiting the rotation of the valve stem 13. In combination with the friction of the disc plate 14 and the self-locking of the driving motor 6, the leakage-proof effect of the entire electric butterfly valve is further improved. In addition, when the butterfly valve is in a closed state and the fluid at one end of the feed end 2 is still in a pressurized state, the fluid will generate pressure on the pressure plate 15, causing the pressure plate 15 to compress the elastic rubber pad 19 and move toward the side of the valve stem 13. The displacement of the pressure plate 15 will cause the elastic sheet 16 to generate outward pressure, causing the semi-ring sealing ring 17 to apply pressure to the valve body sealing ring 21, thereby increasing the friction between the disc plate 14 and the valve body sealing ring 21, and further improving the anti-leakage effect of the entire butterfly valve.

[0042] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

Claims

1. A leakage-proof electric butterfly valve, comprising: A valve body (1) and a drive motor (6), characterized in that: one end of the valve body (1) is a feed end (2), and the other end is a discharge end (3); a valve body sleeve (4) is provided at the center of the top of the valve body (1); a top plate (5) is provided at the top of the valve body sleeve (4); a drive motor (6) is provided at the top of the top plate (5); a valve stem (13) is provided at the bottom end of the output shaft of the drive motor (6); disc plates (14) are provided on both sides of the outer wall of the valve stem (13); a positioning toothed disc (7) is fixed to the outer wall of the upper half of the valve stem (13); a fixing rod (8) is provided on one side of the outer wall of the drive motor (6); a positioning rotating rod (9) is rotatably provided at the bottom of one end of the fixing rod (8); a positioning tooth is provided at one end of the positioning rotating rod (9); the outer contour of the positioning tooth matches the tooth gap contour of the positioning toothed disc (7).

2. The anti-leakage electric butterfly valve according to claim 1, characterized in that: An elastic rubber pad (19) is provided on one side of the valve stem (13) close to the feed end (2), a pressure plate (15) is fixed to one side of the elastic rubber pad (19), an elastic sheet (16) is fixed to the outer wall of the pressure plate (15), a semi-ring sealing ring (17) is provided on one end of the elastic sheet (16), and the outer wall contour of the semi-ring sealing ring (17) is consistent with the outer wall contour of the disc plate (14).

3. The anti-leakage electric butterfly valve according to claim 2, characterized in that: A limiting strip (18) is provided on one side of the disc plate (14) close to the feed end (2), the limiting strip (18) being located outside the semi-ring sealing ring (17), the limiting strip (18) being L-shaped, one end of the limiting strip (18) being fixed to the disc plate (14), and the other end of the limiting strip (18) being located above one side of the semi-ring sealing ring (17).

4. The anti-leakage electric butterfly valve according to claim 1, characterized in that: A spring (10) is provided on one side of the bottom of the fixing rod (8), the bottom end of the spring (10) is connected to the positioning rotating rod (9), and the spring (10) is always in a compressed state.

5. The anti-leakage electric butterfly valve according to claim 4, characterized in that: An electromagnet (11) is provided on one side of the bottom of the fixing rod (8), and a magnetic attraction rod (12) is provided on one side of the top of the positioning rotating rod (9), wherein the magnetic conductive surfaces of the electromagnet (11) and the magnetic attraction rod (12) face each other.

6. The anti-leakage electric butterfly valve according to claim 2, characterized in that: An external joint (20) is provided on one side of the outer wall of the feed end (2), and the external joint (20) is used to connect to a pressure pipe.

7. The anti-leakage electric butterfly valve according to claim 1, characterized in that: The inner wall of the valve body (1) is located outside the disc plate (14) and is provided with a valve body sealing ring (21), and the inner wall of the valve body sealing ring (21) is in contact with the outer wall of the disc plate (14).

8. The anti-leakage electric butterfly valve according to claim 2, characterized in that: There are a plurality of elastic sheets (16), and the plurality of elastic sheets (16) are evenly arranged in the circumferential direction on the pressing plate (15).

9. The anti-leakage electric butterfly valve according to claim 3, characterized in that: There are a plurality of the limiting strips (18), and the plurality of limiting strips (18) are evenly arranged in the circumferential direction on the disc plate (14).

10. The anti-leakage electric butterfly valve according to claim 1, characterized in that: The pressure plate (15) is located in the center of the valve body (1) and close to the feed end (2).

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