Butterfly valve with automatic driving mechanism

Abstract

The invention relates to a butterfly valve with an automatic driving mechanism, and belongs to the technical field of butterfly valve automatic driving mechanisms, the butterfly valve comprises a butterfly valve seat and the automatic driving mechanism, a worm assembly capable of driving a worm gear to rotate is arranged in the automatic driving mechanism, the worm gear rotates to drive a butterfly plate to deflect, and a pressure compensation assembly can be driven by a connecting piece to downwards press a compensation medium. The pressure of the compensation medium on the fluid in the flow channel is increased. By arranging the pressure compensation assembly capable of acting along with rotation of the worm gear, when the worm gear rotates, the butterfly plate is driven to deflect, the flow channel is sealed, in the deflection process of the butterfly plate, fluid is hindered by the butterfly plate and is gradually increased, so that the pressure of the fluid on the interior of the butterfly valve seat is increased, and meanwhile in the deflection process of the butterfly plate, the flow channel is sealed. The pressure compensation assembly can be driven to act, the compensation medium is pressed down, the pressure of the compensation medium is increased, and the risk of leakage caused by the fact that fluid in a flow channel rushes out of a butterfly valve seat due to the fact that the pressure is too large when the butterfly plate is sealed is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of automatic driving mechanisms for butterfly valves, and in particular to a butterfly valve with an automatic driving mechanism. Background Art

[0002] A butterfly valve is a rotary valve with a disc-shaped valve disc or butterfly plate. It opens and closes the valve by rotating 90° or about 90° around the valve axis to control the flow of the fluid and also to seal the fluid.

[0003] The butterfly valve has a simple structure, small size, light weight, small space occupation, relatively small resistance, quick opening and closing, small opening and closing power, good sealing, and long service life. It is suitable for low-pressure large-diameter valves, especially in water systems and gas systems. Compared with ball valves and stop valves, the existing butterfly valves have poor sealing performance, so they are used in places where sealing requirements are not very high.

[0004] When a butterfly valve is used for a long time to seal or control the flow of fluid, the fluid pressure on the seal inside the butterfly valve will increase, thereby increasing the risk of fluid leakage inside the butterfly valve. Summary of the invention

[0005] The present application provides a butterfly valve with an automatic drive mechanism, which can solve the problem that the existing butterfly valves have insufficient sealing performance, especially when the butterfly valve controls or seals the fluid flow, the pressure of the fluid on the internal sealing components of the valve body increases, resulting in an increased risk of leakage.

[0006] The technical solution of the present application is as follows: A butterfly valve with an automatic drive mechanism, comprising: A butterfly valve seat, wherein a flow channel for fluid flow is provided inside the butterfly valve seat, the flow channel extends transversely in the butterfly valve seat, and a valve stem assembly perpendicular to the flow channel is provided inside the butterfly valve seat; An automatic driving mechanism is mounted on the valve seat of the butterfly valve, a compensating medium is provided at the bottom end of the automatic driving mechanism, a pressure compensating assembly is provided above the compensating medium, one end of the valve stem assembly extends into the flow channel and is fixedly equipped with a butterfly plate, the other end passes through the automatic driving mechanism and is connected to a worm gear, a worm assembly that can drive the worm gear to rotate is provided inside the automatic driving mechanism, the rotation of the worm gear can drive the butterfly plate to deflect to seal the fluid, and the pressure compensating assembly can also be driven by a connecting piece to press down the compensating medium to increase the pressure of the compensating medium on the fluid in the flow channel.

[0007] By adopting the above scheme, a pressure compensation component that can move with the rotation of the worm gear is provided. When the worm gear rotates, the butterfly plate is driven to deflect and the flow channel is sealed. During the deflection of the butterfly plate, the fluid is gradually hindered by the butterfly plate, so the pressure of the fluid on the inside of the butterfly valve seat increases. At the same time, during the deflection of the butterfly plate, the pressure compensation component can be driven to move, press down the compensation medium, so that the pressure of the compensation medium increases, and the risk of leakage caused by the excessive pressure of the fluid in the flow channel when the butterfly plate is sealed, which causes the butterfly valve seat to rush out and leak.

[0008] In one embodiment of the present application, the automatic driving mechanism further comprises: A driving motor, wherein the driving motor is mounted on the valve seat of the butterfly valve; The drive box, the worm assembly is rotatably mounted on one side of the drive box, the worm assembly passes through the drive box, one end of the worm assembly is connected and fixed to the drive shaft of the drive motor, and the other end cooperates with the worm wheel.

[0009] By adopting the above scheme, through the cooperation between the worm assembly and the worm wheel, when the angle of the butterfly plate needs to be adjusted, the driving motor can drive the worm assembly to rotate, and then drive the valve stem and the butterfly plate to deflect the angle through the thread cooperation between the worm assembly and the worm wheel. By utilizing the self-locking characteristics between the worm assembly and the worm wheel, after the angle of the butterfly plate is adjusted, the worm wheel will not actively deflect due to the pressure, thereby improving the stability of the butterfly plate when controlling the flow rate or sealing the fluid.

[0010] In one embodiment of the present application, the butterfly valve seat also includes an internally hollow extension portion, one end of the extension portion is vertically mounted on the butterfly valve seat and is connected to the flow channel, the valve stem assembly is arranged inside the extension portion along the length direction of the extension portion, and the automatic drive mechanism is assembled at the other end of the extension portion.

[0011] By adopting the above solution, by assembling an extension perpendicular to the flow channel on the butterfly valve seat, when the valve stem assembly drives the butterfly valve to rotate in the flow channel, the pressure of the fluid on the butterfly plate can be perpendicular to the plane of the butterfly plate, thereby enhancing the sealing performance of the butterfly plate.

[0012] In one embodiment of the present application, the valve stem assembly also includes a valve stem, one end of which extends into the flow channel and is fixedly connected to a butterfly plate, and the other end of which extends into the interior of the drive box and is rotatably connected to the top inner wall of the drive box, and the worm gear is coaxially sleeved on the other end of the valve stem.

[0013] By adopting the above scheme, a valve stem connected to the worm gear is arranged, so that the rotation of the worm gear drives the valve stem to rotate, and then drives the butterfly plate to rotate. When the butterfly plate is subjected to the pressure of the fluid in the flow channel, the engagement between the worm gear and the worm assembly can prevent the butterfly plate from automatically deflecting under the fluid pressure, thereby improving the stability of the device when sealing the flow channel or adjusting the flow rate of the fluid inside the flow channel.

[0014] In one embodiment of the present application, the connecting member includes: A connecting rod, one end of which is fixedly mounted on the lower surface of the worm gear and the other end of which is provided with a rotation groove; A rotating roller is rotatably assembled in the rotating groove.

[0015] By adopting the above scheme, by setting a rotating roller, when the other end of the connecting rod contacts the pressure compensation assembly and drives the pressure compensation assembly downward, the rotating roller can roll on the pressure compensation assembly, thereby reducing the resistance encountered by the connecting rod when moving on the pressure compensation assembly and reducing the load on the driving motor.

[0016] In one embodiment of the present application, the pressure compensation component is disposed between the worm gear and the bottom of the drive box, and the pressure compensation component includes: A pressing plate, which can slide along the length direction of the valve stem and is sleeved on the outside of the valve stem, a first sealing member is provided between the pressing plate and the valve stem, and a second sealing member is provided between the pressing plate and the inner wall of the driving box; An arc-shaped matching piece, wherein the arc-shaped matching piece is arranged on the pressure plate, the two ends of the arc-shaped matching piece have different heights, and a matching curved surface is formed between the two ends, and the other end of the connecting rod can reciprocate on the matching curved surface as the worm gear rotates; A compensation gap is provided between the pressure plate and the inner wall of the bottom end of the driving box, the compensation medium is filled in the compensation gap, and a one-way valve is provided at one side of the bottom of the driving box.

[0017] By adopting the above scheme, by setting the arc-shaped mating piece, when the connecting rod rotates with the worm gear, the rotating roller at the lower end thereof can contact the mating surface and move on the mating surface. By squeezing the arc-shaped mating piece, the arc-shaped mating piece can drive the entire pressure plate to press down and squeeze the compensation medium. The compensation medium seals the gap between the valve stem and the extension part, reducing the risk of the fluid in the flow channel rushing out of the extension part and causing the fluid to leak.

[0018] In one embodiment of the present application, the angle α between the two ends of the matching curved surface and the central axis of the valve stem satisfies: α≥90°.

[0019] By adopting the above scheme, by limiting the angle between the matching curved surface and the central axis of the valve stem, when the butterfly valve is deflected from 0 to 90 degrees, the connecting rod can always come into contact with the matching curved surface on the arc-shaped matching piece, so that the connecting rod will not be out of engagement with the arc-shaped matching piece as the worm gear rotates.

[0020] In one embodiment of the present application, a plurality of sets of third sealing members are provided between the valve stem and the extension portion, and the plurality of sets of third sealing members are arranged at intervals along the length direction of the valve stem and sleeved on the outside of the valve stem.

[0021] By adopting the above scheme, multiple third seals are arranged between the valve stem and the extension part, so that when the flow of the fluid in the flow channel is adjusted or sealed, multiple groups of third seals can ensure that the valve stem rotates along its own axis inside the third seals while improving the sealing effect of the fluid in the flow channel.

[0022] In one embodiment of the present application, the first seal, the second seal and the third seal each include one or more sealing rings stacked on each other.

[0023] By adopting the above solution, the first seal, the second seal and the third seal are formed by using one or more mutually stacked sealing rings, thereby further improving the sealing effects of the first seal, the second seal and the third seal.

[0024] In one embodiment of the present application, the worm assembly comprises: A coupling, the coupling being rotatably mounted on one side of the drive box; A worm, one end of which is fixedly assembled on one end of the coupling, a driving shaft of the driving motor is fixedly assembled on the other end of the coupling, and the worm is threadedly matched with the worm wheel.

[0025] By adopting the above scheme, the other end of the worm is threadedly matched with the worm wheel, and a coupling is used to connect one end of the worm to the driving shaft of the driving motor, so that the driving shaft of the driving motor can transmit the torque to the worm while reducing the damage to the driving motor caused by the worm being subjected to pressure along its own axial direction.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. By setting the compensation medium, when the device controls the valve stem assembly to rotate and drives the butterfly plate to deflect at an angle, the valve stem assembly can drive the pressure compensation assembly to press down the compensation medium. After the compensation medium is squeezed, its own pressure on the gap between the valve stem assembly and the butterfly valve seat increases, thereby reducing the possibility of the internal fluid in the flow channel rushing out of the butterfly valve seat.

[0027] 2. By setting the coordination between the worm wheel and the worm assembly, the rotation of the worm drives the rotation of the worm wheel, so that the butterfly plate can be deflected at an angle in the flow channel to adjust the flow rate of the fluid in the flow channel or seal the flow channel. At the same time, the worm wheel can also use the self-locking characteristics between itself and the worm to prevent the worm wheel from returning to the center due to the pressure of the fluid on the butterfly plate. At the same time, when the worm wheel rotates and presses down the pressure compensation assembly, the pressure of the compensation medium can be maintained, thereby continuously improving the sealing performance of the entire device.

[0028] 3. By setting a coupling, when the drive motor drives the worm to rotate, the coupling is used to connect and fix the two, so that when the drive shaft of the drive motor rotates, the torque can be transmitted to the worm, and when the worm itself is subjected to axial pressure, it is transmitted to the coupling, avoiding damage to the drive motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a front view of a butterfly valve with an automatic drive mechanism provided in an embodiment of the present application; Figure 2 It is a right side view of a butterfly valve with an automatic driving mechanism provided in an embodiment of the present application; Figure 3 It is a front cross-sectional view of a butterfly valve flow passage with an automatic drive mechanism provided in an embodiment of the present application; Figure 4 is a top view of a butterfly valve drive box with an automatic drive mechanism provided in an embodiment of the present application; Figure 5 This is a front view of a connector when a butterfly valve with an automatic drive mechanism closes a flow channel provided in an embodiment of the present application; Figure 6 This is a front view of a connector of a butterfly valve with an automatic drive mechanism provided in an embodiment of the present application when the flow channel is opened.

[0030] Explanation of the reference numerals in the accompanying drawings: 1. butterfly valve seat; 11. flow channel; 12. valve stem assembly; 121. butterfly plate; 122. worm gear; 123. valve stem; 13. extension portion; 131. third sealing member; 1311. sealing ring; 2. automatic drive mechanism; 21. compensation medium; 22. pressure compensation assembly; 221. pressure plate; 2211. compensation gap; 222. first sealing member; 223. second sealing member; 224. arc-shaped mating member; 2241. mating surface; 23. worm assembly; 231. coupling; 232. worm; 24. drive motor; 25. drive box; 251. one-way valve; 26. connecting member; 261. connecting rod; 2611. rotating groove; 262. rotating roller. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-6A butterfly valve with an automatic drive mechanism provided in the present application is further described in detail.

[0032] A butterfly valve with an automatic driving mechanism provided in an embodiment of the present application includes: a butterfly valve seat 1 and an automatic driving mechanism 2.

[0033] See also Figure 1 , Figure 2 and Figure 3 A flow channel 11 is provided inside the butterfly valve seat 1 for fluid flow, and the flow channel 11 extends transversely in the butterfly valve seat 1. A valve stem assembly 12 is provided inside the butterfly valve seat 1 and is perpendicular to the flow channel 11. An automatic driving mechanism 2 is assembled on the butterfly valve seat 1. A compensation medium 21 is provided at the bottom end of the automatic driving mechanism 2. A pressure compensation assembly 22 is provided above the compensation medium 21. One end of the valve stem assembly 12 extends into the flow channel 11 and is fixedly equipped with a butterfly plate 121. The other end passes through the automatic driving mechanism 2 and is connected to a worm gear 122. A worm assembly 23 that can drive the worm gear 122 to rotate is provided inside the automatic driving mechanism 2. The worm gear 122 rotates The butterfly plate 121 can be driven to deflect to seal the fluid, and the pressure compensation assembly 22 can be driven through the connecting piece 26 to press down the compensation medium 21 to increase the pressure of the compensation medium 21 on the fluid in the flow channel 11. By arranging the worm gear 122 to cooperate with the worm 232, the worm gear 122 drives the valve stem assembly 12 and the butterfly plate 121 to deflect when rotating. At the same time, the device can improve the sealing performance between the valve stem assembly 12 and the butterfly valve seat 1 according to the angular position of the deflection of the butterfly plate 121, so that the greater the pressure of the fluid in the flow channel 11 on the butterfly plate 121 during the deflection process, the better the sealing performance of the compensation medium 21 on the valve stem assembly 12 and the butterfly valve seat 1.

[0034] In this embodiment, the compensation medium 21 and the fluid in the flow channel 11 are the same fluid material.

[0035] Please continue reading Figure 2 The butterfly valve seat 1 also includes an extension portion 13 with a hollow interior, one end of the extension portion 13 is vertically assembled on the butterfly valve seat 1 and is connected to the flow channel 11, the valve stem assembly 12 is arranged inside the extension portion 13 along the length direction of the extension portion 13, and the automatic drive mechanism 2 is assembled on the other end of the extension portion 13, wherein the extension portion 13 can be integrally assembled with the flow channel 11, or fixedly assembled on the butterfly valve seat 1 by bolts, and the extension portion 13 is arranged on the butterfly valve seat 1 and is perpendicular to the flow channel 11, so that when the valve stem assembly 12 rotates in the extension portion 13, the butterfly plate 121 is more evenly subjected to the fluid pressure in the flow channel 11, thereby improving the sealing performance of the butterfly plate 121.

[0036] Please continue reading Figure 2The valve stem assembly 12 also includes a valve stem 123, one end of which extends into the flow channel 11 and is fixedly connected to a butterfly plate 121, and the other end extends into the interior of the drive box 25 and is rotatably connected to the top inner wall of the drive box 25. The worm gear 122 is coaxially sleeved on the other end of the valve stem 123. By arranging the valve stem 123 extending along the extension portion 13, the worm gear 122 can drive the valve stem 123 to rotate when rotating, and then synchronously drive the butterfly plate 121 to deflect. By utilizing the self-locking characteristics of the worm gear 122 and the worm 232, the butterfly plate 121 can be kept fixed at any angle, so that the device can not only control the opening and closing of the flow channel 11, but also control the flow rate of the fluid in the flow channel 11.

[0037] See also Figure 2 The automatic drive mechanism 2 also includes: a drive motor 24 and a drive box 25. The drive motor 24 is mounted on the butterfly valve seat 1. The worm assembly 23 is rotatably mounted on one side of the drive box 25. The worm assembly 23 penetrates the drive box 25. One end of the worm assembly 23 is connected and fixed to the drive shaft of the drive motor 24, and the other end cooperates with the worm wheel 122. By setting the drive motor 24, the drive motor 24 is used to drive the worm assembly 23 to rotate, and then the cooperation between the worm assembly 23 and the worm wheel 122 can be used to realize the rotation of the worm wheel 122. At the same time, when the worm wheel 122 needs to maintain an angle, the worm wheel 122 will not actively deflect itself under the engagement with the worm 232.

[0038] In this embodiment, the driving motor 24 may be a servo motor or a stepping motor.

[0039] See also Figure 5 and Figure 6 The connecting member 26 includes: a connecting rod 261 and a rotating roller 262. One end of the connecting rod 261 is fixedly assembled on the lower surface of the worm gear 122, and the other end is provided with a rotating groove 2611. The rotating roller 262 is rotatably assembled in the rotating groove 2611. When the connecting rod 261 rotates and squeezes the pressure compensation component 22, the rotating roller 262 can roll on the pressure compensation component 22, thereby reducing the friction resistance between the rotating roller 262 and the pressure compensation component 22, and reducing the load of the drive motor 24.

[0040] See also Figure 2 and Figure 5The pressure compensation component 22 is arranged between the worm gear 122 and the bottom of the driving box 25. The pressure compensation component 22 includes: a pressure plate 221 and an arc-shaped matching piece 224. The pressure plate 221 can slide along the length direction of the valve stem 123 and is sleeved on the outside of the valve stem 123. A first sealing piece 222 is arranged between the pressure plate 221 and the valve stem 123. A second sealing piece 223 is arranged between the pressure plate 221 and the inner wall of the driving box 25. The arc-shaped matching piece 224 is arranged on the pressure plate 221. The heights of the two ends of the arc-shaped matching piece 224 are inconsistent, and a matching curved surface 2241 is formed between the two ends. The other end of the connecting rod 261 can move with the worm gear 1 22 rotates and reciprocates on the matching surface 2241, a compensation gap 2211 is provided between the pressure plate 221 and the inner wall of the bottom end of the driving box 25, the compensation medium 21 is filled in the compensation gap 2211, and a one-way valve 251 is provided on one side of the bottom of the driving box 25. By arranging an arc-shaped matching piece 224 on the pressure plate 221, when the worm gear 122 drives the connecting rod 261 to rotate, the connecting rod 261 can squeeze the matching surface 2241, cooperate with the opening and closing state of the butterfly plate 121, and adjust the pressure on the compensation medium 21, so that the device can enhance the sealing performance of the fluid in the flow channel 11 according to the opening and closing angle of the butterfly plate 121.

[0041] In a further embodiment, see Figure 5 and Figure 6 The angle α between the two ends of the matching surface 2241 and the central axis of the valve stem 123 satisfies: α≥90°, wherein the angle α can be 100°. By limiting the angle between the matching surface 2241 and the central axis of the valve stem 123, the connecting rod 261 can match the movement trajectory of the butterfly plate 121 from 0 to 90° when moving on the matching surface 2241. The pressure plate 221 is used to press down the compensation medium 21 at different pressures, thereby ensuring the sealing performance of the device and preventing the connecting rod 261 from being out of fit with the matching surface 2241.

[0042] Please continue reading Figure 2 A plurality of third sealing members 131 are provided between the valve stem 123 and the extension portion 13. The plurality of third sealing members 131 are arranged at intervals along the length direction of the valve stem 123 and are sleeved on the outside of the valve stem 123. By providing the third sealing members 131, the valve stem 123 can rotate along its own axis inside the third sealing members 131, thereby improving the sealing effect on the fluid in the flow channel 11.

[0043] Please continue reading Figure 2 The first seal 222, the second seal 223 and the third seal 131 each include one or more sealing rings 1311 stacked on each other, wherein the first seal 222, the second seal 223 and the third seal 131 can be multiple sealing rings 1311 stacked on each other to further improve the sealing performance of the three.

[0044] In this embodiment, the first sealing member 222 , the second sealing member 223 and the third sealing member 131 are each composed of two sealing rings 1311 which are stacked and disposed concentrically with each other.

[0045] See also Figure 4 The worm assembly 23 includes: a coupling 231 and a worm 232. The coupling 231 is rotatably assembled on one side of the drive box 25. One end of the worm 232 is fixedly assembled on one end of the coupling 231. The drive shaft of the drive motor 24 is fixedly assembled on the other end of the coupling 231. The worm 232 is threadedly matched with the worm wheel 122. Through the cooperation between the worm 232 and the worm wheel 122, the worm 232 can drive the worm wheel 122 to rotate. At the same time, the worm 232 can clamp the worm wheel 122 so that it will not rotate actively. At the same time, the coupling 231 can effectively reduce the damage caused by the axial force on the drive motor 24.

[0046] In summary, when the device needs to deflect the butterfly plate 121 at an angle to change the flow channel 11 from an open state to a closed state, the driving motor 24 drives the coupling 231 to rotate, and then drives the worm 232 to rotate, and the worm 232 drives the worm wheel 122 to rotate, and by controlling the rotation angle of the worm wheel 122, the deflection angle of the butterfly plate 121 in the flow channel 11 is synchronously controlled, thereby realizing the opening and closing of the flow channel 11. At the same time, when the worm wheel 122 rotates, it drives the connecting rod 261 to move on the matching surface 2241 and squeezes the matching surface 2241, so that the pressure plate 221 can press down the compensation medium 21 inside the drive box 25, and use the compensation medium 21 to increase the pressure on the gap between the valve stem 123 and the valve seat, thereby reducing the possibility of leakage from the gap between the valve stem 123 and the valve seat due to the increase in pressure when the fluid in the flow channel 11 is blocked by the butterfly plate 121.

[0047] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A butterfly valve with an automatic drive mechanism, characterized in that: include: A butterfly valve seat (1), wherein a flow channel (11) is provided inside the butterfly valve seat (1) for fluid flow, the flow channel (11) extends transversely in the butterfly valve seat (1), and a valve stem assembly (12) is provided inside the butterfly valve seat (1) and is perpendicular to the flow channel (11); An automatic drive mechanism (2) is mounted on the butterfly valve seat (1), a compensation medium (21) is provided at the bottom of the automatic drive mechanism (2), a pressure compensation component (22) is provided above the compensation medium (21), one end of the valve stem component (12) extends into the flow channel (11) and is fixedly mounted with a butterfly plate (121), and the other end passes through the automatic drive mechanism (2) and is connected to a worm gear (122), a worm assembly (23) is provided inside the automatic drive mechanism (2) and can drive the worm gear (122) to rotate, the rotation of the worm gear (122) can drive the butterfly plate (121) to deflect to seal the fluid, and can also drive the pressure compensation component (22) to press down the compensation medium (21) through a connecting piece (26) to increase the pressure of the compensation medium (21) on the fluid in the flow channel (11).

2. A butterfly valve with an automatic drive mechanism according to claim 1, characterized in that: The automatic driving mechanism (2) further comprises: A driving motor (24), wherein the driving motor (24) is mounted on the butterfly valve seat (1); A drive box (25), the worm assembly (23) is rotatably mounted on one side of the drive box (25), the worm assembly (23) passes through the drive box (25), one end of the worm assembly (23) is connected and fixed to the drive shaft of the drive motor (24), and the other end is matched with the worm wheel (122).

3. A butterfly valve with an automatic drive mechanism according to claim 2, characterized in that: The butterfly valve seat (1) also includes an internally hollow extension portion (13), one end of the extension portion (13) is vertically mounted on the butterfly valve seat (1) and is connected to the flow channel (11), the valve stem assembly (12) is arranged inside the extension portion (13) along the length direction of the extension portion (13), and the automatic drive mechanism (2) is mounted on the other end of the extension portion (13).

4. A butterfly valve with an automatic drive mechanism according to claim 3, characterized in that: The valve stem assembly (12) also includes a valve stem (123), one end of which extends into the flow channel (11) and is fixedly connected to a butterfly plate (121), and the other end of which extends into the interior of the drive box (25) and is rotatably connected to the top inner wall of the drive box (25), and the worm gear (122) is coaxially sleeved on the other end of the valve stem (123).

5. A butterfly valve with an automatic drive mechanism according to claim 4, characterized in that: The connecting member (26) comprises: A connecting rod (261), one end of which is fixedly mounted on the lower surface of the worm gear (122), and the other end of which is provided with a rotation groove (2611); A rotating roller (262), the rotating roller (262) is rotatably assembled in the rotating groove (2611).

6. A butterfly valve with an automatic drive mechanism according to claim 5, characterized in that: The pressure compensation component (22) is arranged between the worm gear (122) and the bottom of the drive box (25), and the pressure compensation component (22) comprises: A pressing plate (221), wherein the pressing plate (221) can slide along the length direction of the valve stem (123) and is sleeved on the outside of the valve stem (123), a first sealing member (222) is provided between the pressing plate (221) and the valve stem (123), and a second sealing member (223) is provided between the pressing plate (221) and the inner wall of the driving box (25); An arc-shaped matching piece (224), wherein the arc-shaped matching piece (224) is arranged on the pressure plate (221), the two ends of the arc-shaped matching piece (224) are of different heights, and a matching curved surface (2241) is formed between the two ends, and the other end of the connecting rod (261) can reciprocate on the matching curved surface (2241) as the worm gear (122) rotates; A compensation gap (2211) is provided between the pressure plate (221) and the inner wall of the bottom end of the drive box (25), the compensation medium (21) is filled in the compensation gap (2211), and a one-way valve (251) is provided on one side of the bottom of the drive box (25).

7. A butterfly valve with an automatic drive mechanism according to claim 6, characterized in that: The angle α between the two ends of the matching curved surface (2241) and the central axis of the valve stem (123) satisfies: α≥90°.

8. A butterfly valve with an automatic drive mechanism according to claim 6, characterized in that: A plurality of sets of third sealing members (131) are provided between the valve stem (123) and the extension portion (13); the plurality of sets of third sealing members (131) are arranged at intervals along the length direction of the valve stem (123) and are sleeved on the outside of the valve stem (123).

9. A butterfly valve with an automatic drive mechanism according to claim 8, characterized in that: The first sealing member (222), the second sealing member (223) and the third sealing member (131) each include one or more sealing rings (1311) stacked on top of each other.

10. A butterfly valve with an automatic drive mechanism according to claim 2, characterized in that: The worm assembly (23) comprises: A coupling (231), the coupling (231) being rotatably mounted on one side of the drive box (25); A worm (232), one end of the worm (232) is fixedly assembled on one end of the coupling (231), a drive shaft of the drive motor (24) is fixedly assembled on the other end of the coupling (231), and the worm (232) is threadedly matched with the worm wheel (122).

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