CN114623245A

CN114623245A - Bidirectional sealing type leakage-proof butterfly valve

Info

Publication number: CN114623245A
Application number: CN202210254646.7A
Authority: CN
Inventors: 韩勇; 余正可
Original assignee: Shanghai Huadian Valve Group Co ltd
Current assignee: Shanghai Huadian Valve Group Co ltd
Priority date: 2022-03-15
Filing date: 2022-03-15
Publication date: 2022-06-14

Abstract

The invention discloses a bidirectional sealed leakage-proof butterfly valve which comprises a valve body, wherein flanges are fixedly connected to two ends of the valve body, mounting seats are fixedly arranged at two ends of the top of the valve body, a valve rod is rotatably connected to the inner side of each mounting seat, symmetrically distributed sealing butterfly plates are respectively arranged on the inner sides of the valve body, the lower end of the valve rod penetrates through the top of the valve body and is fixedly connected with the sealing butterfly plates, self-adjusting deflection mechanisms are respectively arranged in the two sealing butterfly plates, the bottoms of the sealing butterfly plates are rotatably connected with the valve body through connecting shafts, a handle is fixedly arranged at the upper end of the valve rod, and a locking mechanism is arranged between the handle and the valve body. The self-adjusting deflection mechanism can automatically adjust the pressure at the two ends of the sealing butterfly plate so as to achieve the effect of balance, the locking mechanism locks the valve rod so as to lock the closed sealing butterfly plate, the butterfly valve is ensured to have good sealing performance, the leakage of a medium is prevented when the butterfly valve is closed, and meanwhile, the opening angle of the sealing butterfly plate can be adjusted.

Description

Butterfly valve is prevented leaking by two-way canned type

Technical Field

The invention relates to the technical field of butterfly valves, in particular to a bidirectional sealing type leakage-proof butterfly valve.

Background

A butterfly valve, also called a flap valve, is a regulating valve with a simple structure, and can be used for on-off control of low-pressure pipeline media, namely a valve with a closing member (a valve clack or a butterfly plate) which is a disc and rotates around a valve shaft to open and close, and the valve can be used for controlling the flow of various types of fluids such as air, water, steam, various corrosive media, slurry, oil products, liquid metal, radioactive media and the like. The butterfly valve mainly plays a role in cutting off and throttling on a pipeline, and the butterfly valve opening and closing piece is a disc-shaped butterfly plate and rotates around the axis of the butterfly valve body in the valve body, so that the opening and closing or adjusting purpose is achieved.

An improved anti-leakage butterfly valve is also disclosed in the chinese patent with the application date of 2018.09.18 and the publication number of CN208967060U entitled "an anti-leakage butterfly valve", however, the anti-leakage butterfly valve needs to make the fastening bolt in a unscrewed state when opening or closing, and the fastening bolt may incline when rotating the rotating shaft of the butterfly valve, which affects the smoothness of the butterfly valve in the opening and closing process.

At present there is the defect that needs to overcome to butterfly valve during operation, the butterfly valve is because circular, because the operation is canonical when the butterfly valve opens and shuts and leads to producing the skew between the butterfly plate of butterfly valve inside and the valve body internal diameter, and then leads to the butterfly plate atress inhomogeneous, when the internal pressure of valve body was too big, takes place the deflection easily, causes the leakage, but also because of the leakage is not obvious to along with the butterfly plate long-time work leads to the valve body inside to take place bending deformation easily, thereby leads to the valve function to scrap.

Disclosure of Invention

The present invention is directed to a bi-directional sealing type leakage-proof butterfly valve, which solves the above problems.

In order to solve the technical problems, the invention provides the following technical scheme: the utility model provides a butterfly valve is prevented leaking by two-way canned type, includes the valve body, the equal fixedly connected with flange in both ends of valve body, the equal fixed mount pad that is equipped with in top both ends of valve body, the inboard rotation of mount pad is connected with the valve rod, the inboard of valve body is equipped with the sealed butterfly plate of symmetric distribution respectively, the lower extreme of valve rod runs through valve body top and sealed butterfly plate fixed connection, two all be equipped with self-adjusting deflection mechanism in the sealed butterfly plate, the bottom of sealed butterfly plate is passed through the connecting axle and is connected with the valve body rotation, the upper end fixed mounting of valve rod has the handle, be equipped with locking mechanism between handle and the valve body.

Further, the self-adjusting deflection mechanism comprises a plurality of grooves circumferentially arranged on the surfaces of two sides of the sealing butterfly plate, a stress block is arranged on the inner side of each groove, a first spring is connected between each stress block and the inner wall of each groove, a stress rod is fixedly connected to one side of each stress block, a conduction rod is hinged to one end of each stress rod, a cavity is arranged on the inner side of each sealing butterfly plate and communicated with the corresponding groove, symmetrical conical seats are fixedly arranged on the inner walls of the two sides of each cavity, a shuttle-shaped ball cage is fixedly connected between the two conical seats, a middle ball is arranged on the inner side of each ball cage, movable plates are arranged on the upper side, the lower side, the left side and the right side of each middle ball, damping pads are fixedly arranged on the sides of the movable plates close to the ball cages and are in contact with the surfaces of the middle balls, the two ends of the movable plates are respectively hinged to the lower ends of the conduction rods on the two sides, and hinged seats are fixedly arranged on the inner walls of the upper side and the lower side of each cavity, the middle part of the conduction rod is hinged with the hinge base.

Further, the inboard of atress piece is equipped with supplementary adjustment subassembly, supplementary adjustment subassembly is including locating the piston chamber of the inboard central authorities of atress piece, the inboard symmetry in piston chamber is equipped with two first pistons, two be connected with the second spring between the first piston, the both sides intercommunication in piston chamber has the compression chamber of symmetric distribution, the inboard in compression chamber is equipped with the second piston, the top fixedly connected with piston rod of second piston, the supplementary atress board of top fixedly connected with of piston rod, the dashpot that the symmetry set up is seted up to the surface of atress piece, dashpot and supplementary atress board adaptation.

Furthermore, the ball cage is composed of four arc-shaped rods with smooth surfaces, two ends of each arc-shaped rod are fixedly connected with the same fixing column, and the fixing columns are fixedly connected to the end portions of the conical seats.

Furthermore, spacing holes are formed in the two ends of the conducting rod, and pin shafts matched with the spacing holes are fixedly connected to the two ends of the stress rod and the two ends of the movable plate.

Further, the sleeve pipe of valve rod lower extreme is located including the cover to locking mechanism, the sleeve pipe is fixed in the top of mount pad, a plurality of draw-in groove has evenly been seted up to sheathed tube one side outer wall upper end, it is equipped with the depression bar to run through on the handle, the top of depression bar is fixed with the clamp plate, and is connected with the third spring between clamp plate and the handle, the lower extreme fixedly connected with support of handle, the inboard rotation of support is connected with the rotation axis, one side fixedly connected with of rotation axis dials the board, opposite side fixedly connected with fixture block, fixture block and draw-in groove looks adaptation, the fixed spring leaf that is equipped with between fixture block and the support.

Furthermore, the bottom of the pressure lever is hinged to the surface of the poking plate, a strip-shaped hole is formed in the lower end of the pressure lever, and a fixing shaft matched with the strip-shaped hole is fixed on the poking plate.

Furthermore, the inner wall of the valve body is embedded with two sealing rings matched with the sealing butterfly plates, and the two sealing rings are symmetrically arranged on two sides of each sealing butterfly plate.

Furthermore, a detention cavity is arranged between the two sealing butterfly plates, and a sealing piston is connected to the top of the detention cavity in a threaded mode.

Furthermore, a micro sealing ring is fixedly embedded at the joint between the groove and the cavity, and the micro sealing ring is matched with the stress rod.

Compared with the prior art, the invention has the following beneficial effects:

1. by arranging the self-adjusting deflection mechanism and the auxiliary adjusting component, when the sealing butterfly plate deflects leftwards, a fluid medium flows from the left side of the sealing butterfly plate in an accelerating manner, under the impact of the fluid, a stress block on the left side of the sealing butterfly plate moves towards the inner side of the groove, the fluid on the left side of the sealing butterfly plate is buffered and driven, the first spring is driven to compress, the stress rod moves, the stress rod then drives the transmission rod to move, the transmission rod drives the movable plate to move through the hinged seat in a lever manner, the movable plate then rubs with the surface of the middle ball through the damping pad to further drive the middle ball to rotate, similarly, the middle ball then drives the rest movable plates to move through the damping pads, the other movable plates continue to drive the stress rods to move through the transmission rods on the two sides, and the stress rod then drives the stress block on the right side to move out of the groove, so that the resistance on the right side of the sealing butterfly plate is increased, when the force bearing block is impacted by fluid, two auxiliary force bearing plates are impacted simultaneously, then the auxiliary force bearing plates drive the piston rod to move, the piston rod drives the second piston to compress the compression cavity, and gas in the compression cavity drives the first piston to extrude the second spring, so that the impact force on the surface of the force bearing block is adjusted, and the force bearing block can keep balanced and stable under strong fluid impact;

2. according to the invention, the locking mechanism is arranged, the pressing plate drives the pressing rod to move downwards, the third spring is in a compressed state at the moment, the pressing rod then drives the poking plate to rotate around the rotating shaft and drive the clamping block to move upwards, the clamping block is separated from the clamping groove at the same time, the spring piece is compressed at the moment, then the handle is rotated and the pressing plate is released, and under the acting force of the spring piece and the third spring, the clamping block is clamped in the clamping groove, so that the handle is locked.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a front cross-sectional view of the present invention;

FIG. 3 is a side cross-sectional view of the present invention;

FIG. 4 is an enlarged view of the structure of FIG. 2;

FIG. 5 is an enlarged view of the structure of FIG. 4 at B;

FIG. 6 is a side view of the movable plate, damping pad, cage, stationary post and intermediate ball of the present invention;

FIG. 7 is a cross-sectional view of the auxiliary adjustment assembly of the present invention;

FIG. 8 is an enlarged view of the structure of FIG. 3 at C in accordance with the present invention;

in the figure: 1. a valve body; 2. a flange; 3. a mounting seat; 4. a valve stem; 5. sealing the butterfly plate; 6. a self-adjusting deflection mechanism; 61. a groove; 62. a stress block; 63. a first spring; 64. a force-bearing rod; 65. a conductive rod; 651. a limiting hole; 66. a cavity; 67. a conical seat; 68. a ball cage; 681. an arcuate bar; 682. fixing the column; 69. a middle ball; 610. a movable plate; 611. a damping pad; 612. a hinged seat; 613. a micro seal ring; 7. a handle; 8. a locking mechanism; 81. a sleeve; 82. a card slot; 83. a pressure lever; 84. pressing a plate; 85. a third spring; 86. a support; 87. a rotating shaft; 88. a poking plate; 89. a clamping block; 810. a spring plate; 811. a strip-shaped hole; 9. an auxiliary adjustment assembly; 91. a piston cavity; 92. a first piston; 93. a second spring; 94. a compression chamber; 95. a second piston; 96. a piston rod; 97. an auxiliary stress plate; 98. a buffer tank; 10. a seal ring; 11. a retention chamber; 12. the piston is sealed.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-8, the invention provides a two-way sealed type leakage-proof butterfly valve, which comprises a valve body 1, wherein two ends of the valve body 1 are fixedly connected with flanges 2, two ends of the top of the valve body 1 are fixedly provided with mounting seats 3, the inner sides of the mounting seats 3 are rotatably connected with valve rods 4, the inner sides of the valve body 1 are respectively provided with sealing butterfly plates 5 which are symmetrically distributed, the lower ends of the valve rods 4 penetrate through the top of the valve body 1 and are fixedly connected with the sealing butterfly plates 5, self-adjusting deflection mechanisms 6 are respectively arranged in the two sealing butterfly plates 5, the bottoms of the sealing butterfly plates 5 are rotatably connected with the valve body 1 through connecting shafts, the upper ends of the valve rods 4 are fixedly provided with handles 7, and locking mechanisms 8 are arranged between the handles 7 and the valve body 1.

In a preferred embodiment, the self-adjusting deflection mechanism 6 includes a plurality of grooves 61 circumferentially disposed on two side surfaces of the sealing butterfly plate 5, a force-receiving block 62 is disposed inside the groove 61, a first spring 63 is connected between the force-receiving block 62 and an inner wall of the groove 61, a force-receiving rod 64 is fixedly connected to one side of the force-receiving block 62, a conducting rod 65 is hinged to one end of the force-receiving rod 64, a cavity 66 is disposed inside the sealing butterfly plate 5, the cavity 66 is communicated with the groove 61, symmetrical conical seats 67 are fixedly disposed on two inner walls of the cavity 66, a shuttle-shaped ball cage 68 is fixedly connected between the two conical seats 67, a middle ball 69 is disposed inside the ball cage 68, movable plates 610 are disposed on upper, lower, left and right sides of the middle ball 69, a damping pad 611 is fixed to one side of the movable plate 610 close to the ball cage 68, and the damping pad 611 contacts with a surface of the middle ball 69, the two ends of the movable plate 610 are hinged to the lower ends of the conducting rods 65 on the two sides, the inner walls of the upper and lower sides of the cavity 66 are fixedly provided with hinged seats 612, the middle part of the conducting rod 65 is hinged to the hinged seats 612, when the sealing butterfly plate 5 deflects to the left, a fluid medium flows from the left side of the sealing butterfly plate 5 at an accelerated speed, under the impact of the fluid, the force bearing block 62 on the left side of the sealing butterfly plate 5 moves towards the inner side of the groove 61 to buffer and drive the fluid on the left side of the sealing butterfly plate 5, and drive the first spring 63 to compress, and simultaneously drive the force bearing rod 64 to move, the force bearing rod 64 then drives the conducting rod 65 to move, the conducting rod 65 drives the movable plate 610 to move through the hinged seats 612 in a lever manner, the movable plate 610 then rubs with the surface of the intermediate ball 69 through the damping pad 611, and then drives the intermediate ball 69 to rotate, and similarly, the intermediate ball 69 then drives the rest movable plates 610 to move through the damping pad 611, other movable plates 610 continue to drive the stress rod 64 to move through the conducting rods 65 on the two sides, the stress rod 64 then drives the stress block 62 on the right side to move out of the groove 61, so that the resistance on the right side of the sealing butterfly plate 5 is increased, the pressures at the left end and the right end of the sealing butterfly plate 5 are balanced, the rest of the first springs 63 are stressed and compressed or stretched, elastic potential energy is gathered inside the sealing butterfly plate 5, the stress block 62, the stress rod 64 and the movable plate 610 are reset to be prepared, and when the sealing butterfly plate 5 deviates, the pressures at the two ends of the sealing butterfly plate 5 can be automatically adjusted to further achieve a balance effect.

In a preferred embodiment, an auxiliary adjusting assembly 9 is disposed inside the force-bearing block 62, the auxiliary adjusting assembly 9 includes a piston cavity 91 disposed in the center of the inner side of the force-bearing block 62, two first pistons 92 are symmetrically disposed inside the piston cavity 91, a second spring 93 is connected between the two first pistons 92, compression cavities 94 symmetrically distributed are communicated with both sides of the piston cavity 91, a second piston 95 is disposed inside the compression cavity 94, a piston rod 96 is fixedly connected to the top of the second piston 95, an auxiliary force-bearing plate 97 is fixedly connected to the top of the piston rod 96, buffer grooves 98 symmetrically disposed are disposed on the outer surface of the force-bearing block 62, the buffer grooves 98 are adapted to the auxiliary force-bearing plate 97, when the force-bearing block 62 is impacted by fluid, the two auxiliary force-bearing plates 97 are impacted at the same time, and then the auxiliary force-bearing plate 97 drives the piston rod 96 to move, the piston rod 96 then drives the second piston 95 to compress the compression chamber 94, and the gas in the compression chamber 94 then drives the first piston 92 to compress the second spring 93, so as to adjust the impact force on the surface of the force-bearing block 62, and the force-bearing block 62 can be kept balanced and stable under the strong fluid impact.

In a preferred embodiment, the ball cage 68 is composed of four arc bars 681 with smooth surfaces, and both ends of the four arc bars 681 are fixedly connected to the same fixing post 682, and the fixing post 682 is fixedly connected to the end of the conical seat 67, so that the middle ball 69 reduces friction with the arc bars 681 when rotating, and the middle ball 69 is limited so that its position is kept unchanged.

In a preferred embodiment, both ends of the conducting rod 65 are provided with a limiting hole 651, and both ends of the stress rod 64 and the movable plate 610 are fixedly connected with a pin shaft matched with the limiting hole 651, so that the conducting rod 65 can move in the cavity 66 conveniently.

In a preferred embodiment, the locking mechanism 8 includes a sleeve 81 sleeved on the lower end of the valve rod 4, the sleeve 81 is fixed on the top of the mounting seat 3, a plurality of slots 82 are uniformly formed in the upper end of the outer wall of one side of the sleeve 81, a press rod 83 penetrates through the handle 7, a press plate 84 is fixed on the top of the press rod 83, a third spring 85 is connected between the press plate 84 and the handle 7, a bracket 86 is fixedly connected to the lower end of the handle 7, a rotating shaft 87 is rotatably connected to the inner side of the bracket 86, a toggle plate 88 is fixedly connected to one side of the rotating shaft 87, a latch 89 is fixedly connected to the other side of the rotating shaft 87, the latch 89 is adapted to the slot 82, a spring leaf 810 is fixedly arranged between the latch 89 and the bracket 86, the press plate 84 drives the press rod 83 to move downward, at this time, the third spring 85 is in a compressed state, the press rod 83 then drives the toggle plate 88 to rotate around the rotating shaft 87, and drives the latch 89 to move upwards, the latch 89 is simultaneously separated from the slot 82, the spring plate 810 is compressed at this time, then the handle 7 is rotated and the pressing plate 84 is released, and the latch 89 is clamped into the slot 82 under the acting force of the spring plate 810 and the third spring 85, so that the handle 7 is locked.

In a preferred embodiment, the bottom of the pressing rod 83 is hinged to the surface of the toggle plate 88, a strip-shaped hole 811 is formed at the lower end of the pressing rod 83, a fixed shaft matched with the strip-shaped hole 811 is fixed on the toggle plate 88, and when the pressing rod 83 moves downwards, the fixed shaft moves freely in the strip-shaped hole 811.

In a preferred embodiment, the inner wall of the valve body 1 is embedded with two sealing rings 10 matched with the sealing butterfly plate 5, and the two sealing rings 10 are symmetrically arranged on two sides of the sealing butterfly plate 5, so that the sealing effect can be remarkably enhanced by the double sealing rings 10.

In a preferred embodiment, a detention cavity 11 is arranged between the two sealing butterfly plates 5, a sealing piston 12 is connected to the top of the detention cavity 11 in a threaded manner, a medium which cannot timely pass through the butterfly valve can be detented after the two sealing butterfly plates 5 are closed, and the medium in the detention cavity 11 can be cleaned by pulling out the sealing piston 12, so that the butterfly valve is prevented from being corroded or polluted due to long-time detention.

In a preferred embodiment, a micro-seal 613 is fixedly embedded at the connection between the groove 61 and the cavity 66, and the micro-seal 613 is matched with the force-bearing rod 64 to prevent fluid media from entering the cavity 66.

The working principle of the invention is as follows: when the sealing butterfly plate 5 deflects to the left, the fluid medium accelerates from the left side of the sealing butterfly plate 5, under the impact of the fluid, the force-bearing block 62 on the left side of the sealing butterfly plate 5 moves towards the inner side of the groove 61, buffers and drives the fluid on the left side of the sealing butterfly plate 5, drives the first spring 63 to compress, and simultaneously moves the force-bearing rod 64, the force-bearing rod 64 then drives the conducting rod 65 to move, the conducting rod 65 drives the movable plate 610 to move through the hinged seat 612 in a lever manner, the movable plate 610 then drives the middle ball 69 to rotate through the surface friction of the damping pad 611 and the middle ball 69, similarly, the middle ball 69 then drives the rest of the movable plates 610 to move through the damping pad 611, the other movable plates 610 continue to drive the force-bearing rod 64 to move through the conducting rods 6 on both sides, the force-bearing rod 64 then drives the force-bearing block 62 on the right side to move out of the groove 61, thereby increasing the resistance on the right side of the sealing butterfly plate 5, therefore, the pressures at the left end and the right end of the sealing butterfly plate 5 are balanced, the rest of the first springs 63 are stressed to compress or stretch, elastic potential energy is gathered in the sealing butterfly plate 5, preparation is made for the resetting of the stress block 62, the stress rod 64 and the movable plate 610, when the sealing butterfly plate 5 deviates, the pressures at the two ends of the sealing butterfly plate 5 can be automatically adjusted to further achieve a balancing effect, when the stress block 62 is impacted by fluid, two auxiliary stress plates 97 are impacted simultaneously, then the auxiliary stress plates 97 drive the piston rod 96 to move, the piston rod 96 then drives the second piston 95 to compress the compression cavity 94, the gas in the compression cavity 94 drives the first piston 92 to extrude the second spring 93, so that the impact force on the surface of the stress block 62 is adjusted, the stress block 62 can keep balanced and stable under the strong fluid impact, and the pressure rod 83 is driven to move downwards by the pressure plate 84, third spring 85 is in compression state this moment, depression bar 83 drives stirring board 88 and rotates around rotation axis 87 next, and drive fixture block 89 rebound, fixture block 89 breaks away from draw-in groove 82 simultaneously, spring leaf 810 is compressed this moment, turning handle 7 and unclamping clamp plate 84 next, under the effort of spring leaf 810 and third spring 85, fixture block 89 card is gone into in draw-in groove 82, thereby lock handle 7, thereby lock valve rod 4, and then lock sealed butterfly plate 5 after closing, guarantee that the butterfly valve has good leakproofness, the medium appears leaking when preventing the butterfly valve to close, can adjust sealed butterfly plate 5's opening angle simultaneously.

It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a butterfly valve is prevented leaking to two-way canned type, includes valve body (1), its characterized in that: the equal fixedly connected with flange (2) in both ends of valve body (1), the top both ends of valve body (1) are all fixed and are equipped with mount pad (3), mount pad (3) inboard is rotated and is connected with valve rod (4), the inboard of valve body (1) is equipped with symmetric distribution's sealed butterfly plate (5) respectively, the lower extreme of valve rod (4) runs through valve body (1) top and sealed butterfly plate (5) fixed connection, two all be equipped with in sealed butterfly plate (5) from adjusting deflection mechanism (6), the bottom of sealed butterfly plate (5) is passed through the connecting axle and is connected with valve body (1) rotation, the upper end fixed mounting of valve rod (4) has handle (7), be equipped with locking mechanism (8) between handle (7) and valve body (1).

2. A bi-directional sealed leak-proof butterfly valve according to claim 1, further comprising: the self-adjusting deflection mechanism (6) comprises a plurality of grooves (61) which are circumferentially arranged on the surfaces of two sides of a sealing butterfly plate (5), a stress block (62) is arranged on the inner side of each groove (61), a first spring (63) is connected between each stress block (62) and the inner wall of each groove (61), a stress rod (64) is fixedly connected to one side of each stress block (62), a conduction rod (65) is hinged to one end of each stress rod (64), a cavity (66) is arranged on the inner side of the sealing butterfly plate (5), the cavity (66) is communicated with the grooves (61), symmetrical conical seats (67) are fixedly arranged on the inner walls of two sides of the cavity (66), a shuttle-shaped ball cage (68) is fixedly connected between the two conical seats (67), a middle ball (69) is arranged on the inner side of the ball cage (68), and movable plates (610) are arranged on the upper side, the lower side, the left side and the right side of the middle ball (69), one side that fly leaf (610) are close to ball cage (68) is fixed with damping pad (611), damping pad (611) contacts with the surface of middle ball (69), the both ends of fly leaf (610) respectively with both sides conduction pole (65) lower extreme is articulated mutually, the equal fixed mounting in upper and lower both sides inner wall of cavity (66) has articulated seat (612), the middle part and the articulated seat (612) of conduction pole (65) are articulated mutually.

3. A bi-directional sealed type leak-proof butterfly valve according to claim 2, wherein: the inboard of atress piece (62) is equipped with supplementary adjustment assembly (9), supplementary adjustment assembly (9) are including piston chamber (91) of locating atress piece (62) inboard central authorities, the inboard symmetry of piston chamber (91) is equipped with two first pistons (92), two be connected with second spring (93) between first piston (92), the both sides intercommunication of piston chamber (91) has the compression chamber (94) of symmetric distribution, the inboard of compression chamber (94) is equipped with second piston (95), the top fixedly connected with piston rod (96) of second piston (95), supplementary atress board (97) of top fixedly connected with of piston rod (96), symmetrical arrangement's dashpot (98) are seted up to the surface of atress piece (62), dashpot (98) and supplementary atress board (97) looks adaptation.

4. A bi-directional sealed type leak-proof butterfly valve according to claim 2, wherein: the ball cage (68) is composed of four arc-shaped rods (681) with smooth surfaces, two ends of each arc-shaped rod (681) are fixedly connected to the same fixing column (682), and the fixing columns (682) are fixedly connected to the end portions of the conical seats (67).

5. A bi-directional sealed type leak-proof butterfly valve according to claim 2, wherein: spacing hole (651) have all been seted up at the both ends of conduction pole (65), the equal fixedly connected with in both ends of atress pole (64) and fly leaf (610) is with the round pin axle of spacing hole (651) looks adaptation.

6. A bi-directional sealed type leak-proof butterfly valve according to claim 1, wherein: the locking mechanism (8) comprises a sleeve (81) sleeved at the lower end of the valve rod (4), the sleeve (81) is fixed on the top of the mounting seat (3), a plurality of clamping grooves (82) are uniformly formed in the upper end of the outer wall of one side of the sleeve (81), a pressure lever (83) penetrates through the handle (7), a pressure plate (84) is fixed at the top of the pressure lever (83), and a third spring (85) is connected between the pressure plate (84) and the handle (7), the lower end of the handle (7) is fixedly connected with a bracket (86), the inner side of the bracket (86) is rotatably connected with a rotating shaft (87), one side of the rotating shaft (87) is fixedly connected with a poking plate (88), the other side is fixedly connected with a clamping block (89), the clamping block (89) is matched with the clamping groove (82), and a spring piece (810) is fixedly arranged between the clamping block (89) and the bracket (86).

7. A bi-directional sealed leak-proof butterfly valve as set forth in claim 6, further comprising: the bottom of the pressure lever (83) is hinged to the surface of the poking plate (88), a strip-shaped hole (811) is formed in the lower end of the pressure lever (83), and a fixing shaft matched with the strip-shaped hole (811) is fixed on the poking plate (88).

8. A bi-directional sealed type leak-proof butterfly valve according to claim 1, wherein: the inner wall of the valve body (1) is embedded with two sealing rings (10) matched with the sealing butterfly plates (5), and the two sealing rings (10) are symmetrically arranged on two sides of each sealing butterfly plate (5).

9. A bi-directional sealed type leak-proof butterfly valve according to claim 1, wherein: and a detention cavity (11) is arranged between the two sealing butterfly plates (5), and the top of the detention cavity (11) is in threaded connection with a sealing piston (12).

10. A bi-directional sealed leak-proof butterfly valve according to claim 2, further comprising: the connecting part between the groove (61) and the cavity (66) is fixedly embedded with a micro sealing ring (613), and the micro sealing ring (613) is matched with the stress rod (64).