High-sealing-performance double-blade butterfly valve

Abstract

The invention discloses a high-sealing-performance double-blade butterfly valve and relates to the field of valves, and the high-sealing-performance double-blade butterfly valve solves the problem that when an existing double-blade butterfly valve is used, the sealing performance of a gap position between the edge of a valve plate and a circulation cavity is not stable enough, the high-sealing-performance double-blade butterfly valve comprises a valve body, an opening and closing mechanism and a sealing mechanism, the circulation cavity is formed in the valve body, and the opening and closing mechanism comprises the valve plate and a control piece; the control piece is operated through the opening and closing mechanism, control over the opening and closing state of the valve plate is achieved, the sealing plate can abut against the edge position of the valve plate in an attached mode, the sliding state of the sealing plate can be controlled in a linkage mode through the sealing mechanism in the valve plate adjusting process, and therefore when the valve is opened, the sealing plate is not prone to falling off when the valve is opened. When the valve is closed, the sealing plate is preferentially controlled to release the sealing state, then the valve plate is controlled to rotate to be opened, when the valve is closed, the valve plate is preferentially controlled to rotate to be closed, then the sealing plate is linked to gradually seal the connecting position of the valve plate and the circulation cavity, and the sealing performance of closing of the valve is higher in a two-side abutting and clamping mode.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, in particular to a high-sealing double-leaf butterfly valve. Background Art

[0002] The double-leaf butterfly valve is a valve used to control the flow of materials into and out of pipelines. The main purpose of the high-sealing double-leaf butterfly valve is to cut off and throttle the pipeline. It uses two independently flipping leaves to achieve opening and closing, and is particularly suitable for controlling the flow of materials in and out. It uses a cylinder to push the connecting rod, which is easy to operate. The double-leaf butterfly valve is widely used in grain, feed, flour, oil, chemical and metallurgical processes. It has the characteristics of decomposing pressure, not easy to leak and good sealing.

[0003] When the existing double-leaf butterfly valve is in use, it opens and closes by rotating the valve plate. In order to ensure that the valve plate can rotate relatively smoothly, the edge of the valve plate and the internal flow cavity of the valve are often not tightly closed. The existing sealing structure generally only seals one side of the valve plate without performing a more comprehensive closing operation on the gap, resulting in relatively poor sealing performance between the valve plate and the flow cavity. Summary of the Invention

[0004] The object of the present invention is to provide a high-sealing double-leaf butterfly valve that is convenient for improving the sealing performance of the gap between the valve plate edge and the flow chamber, so as to solve the problems raised in the above background technology.

[0005] When the closure is closed, the closure is opened and closed, and the closure is opened when the closure is closed, so that the closure is opened and closed, and the closure is opened when the closure is closed.

[0006] Preferably, the opening and closing mechanism also includes a rotating shaft fixedly mounted on the valve plate, a fixed frame fixedly connected in the flow cavity, the outer wall of the rotating shaft rotatably fits with the inner wall of the fixed frame, and both ends of the rotating shaft are rotatably connected to the valve body respectively. The fixed frame is provided with an adjusting member for controlling the fluid flow state between the two groups of the rotating shafts to avoid damage to the fixed frame due to excessive force in the open valve state, thereby facilitating the operation of the control member to achieve control of the opening and closing state of the valve plate.

[0007] Preferably, the control member includes a driving shaft rotatably connected to the valve body, the top ends of the two groups of rotating shafts are coaxially fixedly connected to driving gears, the two groups of driving gears are meshed, one end of the driving shaft is coaxially fixedly connected to a first bevel gear, a second bevel gear rotatably connected to the valve body and meshed with the first bevel gear is provided, a worm is coaxially fixedly connected to the second bevel gear, and a driving member is provided in the valve body for controlling the movement of the valve plate and the sealing plate respectively when the worm rotates, so as to facilitate control of the rotation angle of the valve plate.

[0008] Preferably, the sealing mechanism also includes two groups of storage boxes fixedly installed inside the valve body, the storage boxes are used to store hydraulic oil, the side of the storage box is connected to a sleeve, the side of the sealing plate is fixedly connected to a sliding rod slidably connected to the inner wall of the sleeve, and the storage box is connected to a delivery pipe. The driving member can control the hydraulic strength in the storage box during the process of adjusting the rotation of the valve plate, so that during the adjustment of the valve plate, the sliding state of the sealing plate can be controlled in a linked manner, so that when opening the valve, the sealing plate is preferentially controlled to release the sealing state, and then the valve plate is controlled to rotate open, and when closing the valve, the valve plate is preferentially controlled to rotate and close, and then the sealing plate is linked to gradually close the connection between the valve plate and the flow chamber.

[0009] Preferably, the driving member includes a driving block coaxially fixedly mounted on any group of the driving gears, a worm gear disk rotatably connected to the valve body and a worm gear ring rotatably connected to the worm gear, the inner wall of the worm gear ring is fixedly connected to a clockwork spring fixedly connected to the outer wall of the driving block, and a hydraulic component is provided in the valve body for controlling the hydraulic strength in the storage boxes on both sides in linkage when the worm gear disk rotates, so as to facilitate the separate control of the movement of the valve plate and the sealing plate when the worm gear rotates.

[0010] Preferably, the hydraulic component includes two fixed boxes fixedly installed inside the valve body. The two conveying pipes on both sides are respectively connected to the two fixed boxes on both sides in a communicating manner. A connecting rod is rotatably connected inside the valve body. A third bevel gear is coaxially and fixedly connected to the worm wheel disc. A fourth bevel gear meshing with the third bevel gear is coaxially and fixedly connected to the connecting rod. A linkage member for controlling the hydraulic strength in the two conveying pipes on both sides when the connecting rod rotates is provided inside the fixed box, which is convenient for jointly controlling the hydraulic strength in the two storage boxes on both sides when the worm wheel disc rotates.

[0011] Preferably, the linkage member includes threaded rods coaxially and fixedly installed at both ends of the connecting rod. A driving plate is slidably connected inside the fixed box in the horizontal direction. The threaded rod penetrates through the driving plate and is threadedly connected to the driving plate. Bellows rotatably connected to the inner wall of the fixed box are respectively rotatably connected to both sides of the driving plate, which is convenient for controlling the hydraulic strength in the two conveying pipes on both sides when the connecting rod rotates.

[0012] Preferably, the adjusting member includes a sealing block fixedly installed on the side surface of the rotating shaft. An input groove is formed inside the fixed frame. A rotating groove communicating with the input groove is formed inside the fixed frame. The outer wall of the sealing block is rotatably fitted with the inner wall of the rotating groove. An output groove communicating with the rotating groove is formed inside the fixed frame, which is convenient for controlling the fluid flow state between the two rotating shafts and avoiding damage to the fixed frame due to excessive local force when the valve is in the open state.

[0013] Preferably, a sealing ring is fixedly connected inside the flow passage, which is convenient for fitting and sealing one side of the valve plate.

[0014] Preferably, a flange ring is fixedly connected to the valve body. A knob is coaxially and fixedly connected to one end of the driving shaft, which is convenient for installing and operating the valve body.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] The high-sealing double-leaf butterfly valve provided by the present invention solves the problem that the sealing performance at the gap between the edge of the valve plate and the flow passage is not stable enough when the existing double-leaf butterfly valve is in use. By operating the control member through the opening and closing mechanism, the opening and closing state of the valve plate is controlled. The sealing plate can be in contact with the edge position of the valve plate. Through the sealing mechanism, the sliding state of the sealing plate can be jointly controlled during the adjustment of the valve plate, so that when the valve is opened, the sealing state of the sealing plate is preferentially controlled to be released, and then the valve plate is rotated to be opened. When the valve is closed, the valve plate is preferentially rotated to be closed, and then the sealing plate is jointly controlled to gradually seal the connection between the valve plate and the flow passage. The sealing performance of the valve closure is stronger through the way of clamping on both sides. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the overall structure of the present invention;

[0018] Figure 2 Schematic diagram of the partial structure of the opening and closing mechanism of the present invention;

[0019] Figure 3 Schematic diagram of the internal structure of the valve body of the present invention;

[0020] Figure 4 is Figure 3 Enlarged view of area A in

[0021] Figure 5 Partial structure cross-sectional view of the control member of the present invention;

[0022] Figure 6 is Figure 5 Enlarged view of area B in

[0023] Figure 7 Schematic diagram of the partial structure of the linkage member of the present invention;

[0024] Figure 8 is Figure 7 Enlarged view of area C in

[0025] Figure 9 Exploded view of the partial structure of the sealing mechanism of the present invention;

[0026] Figure 10 Schematic diagram of the structure of the present invention in the valve closed state;

[0027] Figure 11 is Figure 10 Enlarged view of area D in

[0028] Figure 12 Schematic diagram of the structure of the present invention in the valve open state.

[0029] In the figure: 1-valve body; 2-flow cavity; 3-opening and closing mechanism; 4-valve plate; 5-control member; 6-sealing mechanism; 7-sealing plate; 8-rotating shaft; 9-fixed frame; 10-adjusting member; 11-driving shaft; 12-driving gear; 13-first bevel gear; 14-second bevel gear; 15-worm; 16-driving member; 17-storage box; 18-sleeve pipe; 19-sliding rod; 20-conveying pipe; 21-driving block; 22-worm wheel disc; 23-worm wheel ring; 24-winding spring; 25-hydraulic member; 26-fixed box; 27-connecting rod; 28-third bevel gear; 29-fourth bevel gear; 30-linkage member; 31-threaded rod; 32-driving plate; 33-bellows; 34-sealing block; 35-input groove; 36-rotating groove; 37-output groove; 38-sealing ring; 39-flange ring; 40-knob. Detailed implementation manners

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] See also Figures 1 - 12 The present invention provides a technical solution: a high-sealing double-leaf butterfly valve, including a valve body 1, an opening and closing mechanism 3 and a sealing mechanism 6. The valve body 1 is fixedly connected to a flange ring 39. A flow chamber 2 is opened in the valve body 1, and a sealing ring 38 is fixedly connected in the flow chamber 2. The opening and closing mechanism 3 includes two groups of valve plates 4 installed in the flow chamber 2. The valve body 1 is provided with a control member 5 for controlling the rotation angle of the valve plate 4. The opening and closing mechanism 3 controls the opening and closing state of the valve plate 4 by operating the control member 5. The sealing mechanism 6 includes two groups of sealing plates 7 installed inside the valve body 1. The sealing plate 7 can fit and contact with the edge position of the valve plate 4. The sealing mechanism 6 can control the sliding state of the sealing plate 7 in the process of adjusting the valve plate 4, so that when the valve is opened, the sealing plate 7 is first controlled to release the sealing state, and then the valve plate 4 is controlled to rotate and open. When the valve is closed, the valve plate 4 is first controlled to rotate and close, and then the sealing plate 7 is linked to gradually seal the connection between the valve plate 4 and the flow chamber 2.

[0032] The opening and closing mechanism 3 also includes a rotating shaft 8 fixedly mounted on the valve plate 4, a fixed frame 9 fixedly connected to the flow chamber 2, the outer wall of the rotating shaft 8 is rotatably fitted with the inner wall of the fixed frame 9, and the two ends of the rotating shaft 8 are respectively rotatably connected to the valve body 1. An adjusting part 10 is provided in the fixed frame 9 for controlling the fluid flow state between the two sets of rotating shafts 8 to avoid damage to the fixed frame 9 due to excessive local force when the valve is open.

[0033] The control member 5 includes a drive shaft 11 rotatably connected to the valve body 1, one end of the drive shaft 11 is coaxially fixedly connected to the knob 40, the top ends of the two sets of rotating shafts 8 are coaxially fixedly connected to the drive gears 12, the two sets of drive gears 12 are meshed with each other, one end of the drive shaft 11 is coaxially fixedly connected to the first bevel gear 13, a second bevel gear 14 meshed with the first bevel gear 13 is rotatably connected in the valve body 1, a worm 15 is coaxially fixedly connected to the second bevel gear 14, and a drive member 16 is provided in the valve body 1 for controlling the movement of the valve plate 4 and the sealing plate 7 respectively when the worm 15 rotates.

[0034] The sealing mechanism 6 further includes two sets of storage boxes 17 fixedly installed inside the valve body 1. The storage boxes 17 are used to store hydraulic oil. A sleeve pipe 18 is connected and communicated on the side of the storage box 17. A sliding rod 19 slidably connected to the inner wall of the sleeve pipe 18 is fixedly connected to the side of the sealing plate 7. A delivery pipe 20 is connected and communicated on the storage box 17. The driving member 16 can control the hydraulic intensity in the storage box 17 during the rotation of the regulating valve plate 4.

[0035] The driving member 16 includes a driving block 21 coaxially and fixedly installed on any one of the driving gears 12. A worm gear disc 22 meshing with the worm 15 is rotatably connected inside the valve body 1. A worm gear ring 23 meshing with the worm 15 is rotatably connected coaxially on the worm gear disc 22. A hairspring 24 fixedly connected to the outer wall of the driving block 21 is fixedly connected to the inner wall of the worm gear ring 23. A hydraulic member 25 for jointly controlling the hydraulic intensity in the storage boxes 17 on both sides during the rotation of the worm gear disc 22 is provided inside the valve body 1.

[0036] The hydraulic member 25 includes two fixed boxes 26 fixedly installed inside the valve body 1. The two delivery pipes 20 on both sides are respectively connected and communicated with the fixed boxes 26 on both sides. A connecting rod 27 is rotatably connected inside the valve body 1. A third bevel gear 28 is coaxially and fixedly connected to the worm gear disc 22. A fourth bevel gear 29 meshing with the third bevel gear 28 is coaxially and fixedly connected to the connecting rod 27. A linkage member 30 for controlling the hydraulic intensity in the delivery pipes 20 on both sides during the rotation of the connecting rod 27 is provided inside the fixed box 26.

[0037] The linkage member 30 includes threaded rods 31 coaxially and fixedly installed at both ends of the connecting rod 27. A driving plate 32 is slidably connected horizontally inside the fixed box 26. The threaded rod 31 penetrates through the driving plate 32 and is threadedly connected to the driving plate 32. Bellows 33 rotatably connected to the inner wall of the fixed box 26 are respectively rotatably connected to both sides of the driving plate 32.

[0038] The adjusting member 10 includes a sealing block 34 fixedly installed on the side of the rotating shaft 8. An input groove 35 is formed inside the fixed frame 9. A rotating groove 36 communicated with the input groove 35 is formed inside the fixed frame 9. The outer wall of the sealing block 34 is rotatably fitted to the inner wall of the rotating groove 36. An output groove 37 communicated with the rotating groove 36 is formed inside the fixed frame 9.

[0039] Working principle: The valve body 1 is installed on the delivery pipe 20 through the flange ring 39, so that one side of the sealing ring 38 faces the fluid output side, and the sealing plate 7 faces the fluid input side. The edges of the valve plate 4, the sealing ring 38, and the sealing plate 7 are all designed with slopes. When the valve plate 4 is closed, one side of the valve plate 4 can abut against the sealing ring 38. The valve plate 4 is pushed by the fluid and fits and closes towards the sealing ring 38 side, while the other side abuts through the inclined surface of the sealing plate 7, achieving the purpose of simultaneously closing both sides of the gap position of the valve plate 4 and improving the sealing performance.

[0040] When the valve needs to be opened, turn the knob 40, which drives the drive shaft 11 to rotate. The drive shaft 11 drives the first bevel gear 13 to make the second bevel gear 14 rotate. The second bevel gear 14 drives the worm 15 to rotate. The worm 15 drives the worm gear ring 23 and the worm gear disk 22 to rotate simultaneously. At this time, due to the fluid thrust on the valve plate 4 and the resistance force of the sealing plate 7, the worm gear ring 23 will first compress the spring 24 to store energy during the rotation process. During this process, the position of the valve plate 4 remains unchanged. When the worm gear disk 22 rotates, it will directly drive the third bevel gear 28 and the fourth bevel gear 29 to rotate, so that the connecting rod 27 drives the threaded rods 31 on both sides to rotate. The threaded rods 31 drive the drive plate 32 to slide towards the fourth bevel gear 29 in the fixed box 26, so as to pump the hydraulic oil in the storage box 17 into the fixed box 26, reducing the hydraulic strength in the sleeve 18. The sliding rod 19 slides towards the sleeve 18, so that the sealing plate 7 can gradually slide open to both sides, removing the block on this side of the valve plate 4. After the spring 24 stores energy to the set strength, it can drive the driving block 21 to make the driving gear 12 rotate. The driving gears 12 on both sides rotate synchronously and in opposite directions, so that the rotating shaft 8 drives the valve plate 4 to rotate, realizing the function of opening the valve, and conveying the fluid from the flow chamber 2. Continuing to turn the knob 40 can continuously control the opening and closing state of the valve plate 4. At this time, the sealing plate 7 will also continuously slide to both sides. After stopping the knob 40, due to the unilateral thrust of the fluid, the valve plate 4 will always have a tendency to close, so that the spring 24 is always kept in a compressed state, and the worm gear ring 23 cannot drive the worm 15 to rotate, ensuring the stability of the positions of the worm gear ring 23 and the worm gear disk 22.

[0041] Similarly, when closing the valve, turn the knob 40 in the reverse direction. At this time, due to the unidirectional impact force of the fluid, the spring 24 is always kept in a compressed state, and the valve plate 4 is directly driven to deflect to both sides. At the same time, the sealing plate 7 will gradually close towards the middle. During this process, due to the water flow pushing, the valve plate 4 will first reach the state of fitting with the sealing ring 38. At this time, the sealing plate 7 has not reached the communication cavity and will not block the rotation of the valve plate 4. After the valve plate 4 fits with the sealing ring 38, continue to turn the knob 40, but the valve plate 4 will not continue to rotate. At this time, the rotation of the worm gear ring 23 will gradually drive the spring 24 to release the compressed state. At the same time, the worm gear disk 22 rotates to continue driving the sealing plates 7 on both sides to move closer to the middle. When the spring 24 is completely released from compression, the sealing plate 7 is in close contact with both sides of the valve plate 4, completing the operation of sealing and closing the valve.

[0042] It is worth noting that: during the rotation of the rotating shaft 8, the sealing block 34 will also be driven to rotate synchronously, so that when the valve plates 4 are close to each other and the valve is open, the sealing block 34 will slide to one end of the rotating groove 36, so that the fluid flowing from the middle to the fixed frame 9 can flow to the other side through the input groove 35, the rotating groove 36 and the output groove 37 for output, reducing the impact force of the middle fluid on the fixed frame 9, and when the valve is closed, the rotating shaft 8 will drive the sealing block 34 to slide in the opposite direction to the position of conflicting with the input groove 35, thereby sealing the input groove 35 and completing the overall sealing operation of the valve. The joint between the sealing block 34 and the input groove 35 is made of sealing rubber material, which can effectively improve the sealing performance. By arranging a bellows 33 on the outside of the threaded rod 31, the thread gap between the threaded rod 31 and the drive plate 32 can be sealed, thereby ensuring that the hydraulic oil in the fixed box 26 does not flow from the gap between the threaded rod 31 and the drive plate 32, thereby improving the suction performance of the hydraulic oil.

[0043] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0044] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. High-sealing double-leaf butterfly valve, characterized in that, include: A valve body (1), wherein a flow cavity (2) is formed in the valve body (1); Also includes: An opening and closing mechanism (3), the opening and closing mechanism (3) comprising two groups of valve plates (4) mounted in the flow chamber (2), the valve body (1) being provided with a control member (5) for controlling the rotation angle of the valve plates (4), the opening and closing mechanism (3) controlling the opening and closing state of the valve plates (4) by operating the control member (5); A sealing mechanism (6), wherein the sealing mechanism (6) includes two sets of sealing plates (7) installed inside the valve body (1), wherein the sealing plates (7) can fit in contact with the edge of the valve plate (4), and the sealing mechanism (6) can control the sliding state of the sealing plates (7) in a linkage manner during the adjustment of the valve plate (4), so that when the valve is opened, the sealing plates (7) are preferentially controlled to release the sealing state, and then the valve plate (4) is controlled to rotate open, and when the valve is closed, the valve plate (4) is preferentially controlled to rotate closed, and then the sealing plates (7) are linked to gradually close the connection between the valve plate (4) and the flow chamber (2).

2. The highly-sealed double-leaf butterfly valve according to claim 1, wherein: The opening and closing mechanism (3) further comprises a rotating shaft (8) fixedly mounted on the valve plate (4); a fixed frame (9) is fixedly connected in the circulation cavity (2); the outer wall of the rotating shaft (8) is rotationally fitted with the inner wall of the fixed frame (9); both ends of the rotating shaft (8) are rotationally connected to the valve body (1), and an adjusting member (10) is provided in the fixed frame (9) for controlling the fluid flow state between the two groups of the rotating shafts (8) to avoid damage to the fixed frame (9) due to excessive force in the open valve state.

3. The highly-sealed double-leaf butterfly valve according to claim 2, characterized in that: The control member (5) includes a drive shaft (11) rotatably connected to the valve body (1), the top ends of the two groups of the rotating shafts (8) are respectively coaxially fixedly connected to a drive gear (12), the two groups of the drive gears (12) are meshed with each other, one end of the drive shaft (11) is coaxially fixedly connected to a first bevel gear (13), a second bevel gear (14)) meshed with the first bevel gear (13)) is rotatably connected inside the valve body (1), a worm (15)) is coaxially fixedly connected to the second bevel gear (14), and a drive member (16)) is provided inside the valve body (1) for controlling the movement of the valve plate (4) and the sealing plate (7) when the worm (15)) rotates.

4. The highly-sealed double-leaf butterfly valve according to claim 3, characterized in that: The sealing mechanism (6) further comprises two groups of storage boxes (17) fixedly mounted inside the valve body (1), the storage boxes (17) being used to store hydraulic oil, the side of the storage box (17) being connected to a sleeve pipe (18)), the side of the sealing plate (7) being fixedly connected to a sliding rod (19) slidably connected to the inner wall of the sleeve pipe (18)), the storage box (17) being connected to a delivery pipe (20), and the driving member (16) being capable of controlling the hydraulic pressure strength in the storage box (17) during the process of adjusting the rotation of the valve plate (4).

5. The high-sealing double-leaf butterfly valve according to claim 4, wherein: The driving member (16) comprises a driving block (21) coaxially fixedly mounted on any one group of the driving gears (12)); a worm wheel (22) is rotatably connected in the valve body (1) and meshed with the worm (15)); a worm wheel ring (23) is coaxially rotatably connected on the worm wheel (22) and meshed with the worm (15)); a spring spring (24) is fixedly connected to the inner wall of the worm wheel ring (23) and is fixedly connected to the outer wall of the driving block (21); and a hydraulic member (25) is provided in the valve body (1) for controlling the hydraulic strength in the storage boxes (17) on both sides in a linkage manner when the worm wheel (22) rotates.

6. The high-sealing double-leaf butterfly valve according to claim 5, characterized in that: The hydraulic component (25) includes two groups of fixed boxes (26) fixedly installed inside the valve body (1), the delivery pipes (20) on both sides are respectively connected to the fixed boxes (26) on both sides, a connecting rod (27) is rotatably connected inside the valve body (1), a third bevel gear (28) is coaxially fixedly connected to the worm wheel (22), and a fourth bevel gear (29) meshing with the third bevel gear (28) is coaxially fixedly connected to the connecting rod (27), and a linkage component (30) is provided in the fixed box (26) for controlling the hydraulic strength in the delivery pipes (20) on both sides when the connecting rod (27) rotates.

7. The highly-sealed double-leaf butterfly valve according to claim 6, wherein: The linkage member (30) includes a threaded rod (31) coaxially fixedly mounted on both ends of the connecting rod (27); a driving plate (32) is slidably connected in the horizontal direction in the fixing box (26); the threaded rod (31) passes through the driving plate (32) and is threadedly connected to the driving plate (32); and bellows (33) rotatably connected to the inner wall of the fixing box (26) are respectively rotatably connected on both sides of the driving plate (32).

8. The highly-sealed double-leaf butterfly valve according to claim 2, wherein: The regulating member (10) comprises a sealing block (34) fixedly mounted on the side of the rotating shaft (8); an input groove (35) is provided in the fixed frame (9); a rotating groove (36) connected to the input groove (35) is provided in the fixed frame (9); an outer wall of the sealing block (34) is rotatably fitted with an inner wall of the rotating groove (36); and an output groove (37) connected to the rotating groove (36) is provided in the fixed frame (9).

9. The high-sealing double-leaf butterfly valve according to claim 1, characterized in that: A sealing ring (38) is fixedly connected in the circulation cavity (2).

10. The highly-sealed double-leaf butterfly valve according to claim 3, characterized in that: A flange ring (39) is fixedly connected to the valve body (1), and a knob (40) is coaxially fixedly connected to one end of the drive shaft (11).

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