CN115539652A

CN115539652A - Novel industrial butterfly valve structure

Info

Publication number: CN115539652A
Application number: CN202211082990.9A
Authority: CN
Inventors: 肖杏慈
Original assignee: Shijiazhuang Anshui Electronic Technology Co ltd
Current assignee: Shijiazhuang Anshui Electronic Technology Co ltd
Priority date: 2022-09-06
Filing date: 2022-09-06
Publication date: 2022-12-30

Abstract

The invention discloses a novel industrial butterfly valve structure, which relates to the technical field of valves, and particularly relates to a novel industrial butterfly valve structure, which comprises a valve body, wherein the valve body is cylindrical, the novel industrial butterfly valve structure also comprises a valve plate rotatably arranged at the inner side of the valve body, a shaft hole is formed in the valve body, a valve rod is rotatably connected in the shaft hole, the valve rod and the valve plate are mutually clamped and fixed, a valve seat is arranged at the inner side of the valve body, the valve plate and the valve seat are mutually matched and sealed, the valve plate is in a metal circular plate shape, an annular groove is formed in the side surface of the valve plate, a fixing ring is embedded in the annular groove, one side of the fixing ring is fixedly connected with a pressing plate through a bolt, the valve seat comprises a fixed valve seat and a movable valve seat, the fixed valve seat is arranged in the valve body, the movable valve seat is arranged in the valve body in a sliding manner, the movable valve seat is positioned at one side of the fixed valve seat, impurities are not easily remained on a rubber sealing ring of a sealing surface, and the influence on the sealing is prevented as much as possible.

Description

Novel industrial butterfly valve structure

Technical Field

The invention belongs to the technical field of valves, and particularly relates to a novel industrial butterfly valve structure.

Background

A butterfly valve, also called a flap valve, is a regulating valve with a simple structure, can be used for on-off control of a low-pressure pipeline medium, is a valve of which a closing part is a disk and rotates around a valve shaft to open and close, and can be used for controlling the flow of various types of fluid such as air, water, steam, various corrosive media, slurry, oil products, liquid metal, radioactive media and the like. The main functions of cutting off and throttling are realized on the pipeline.

For example, the invention with an authorization notice number of CN112081930B discloses an industrial butterfly valve with an accurate opening and closing function, which comprises a valve body and a valve clack, wherein a bearing platform is fixedly connected to the valve body, a support frame and a fixing plate are fixedly connected to the bearing platform, a fixing frame is fixedly connected to the support frame, a driving motor is arranged on the fixing frame, a first bevel gear is in transmission connection with an output end of the driving motor, and a second bevel gear is arranged in the fixing frame. According to the invention, the output shaft of the driving motor drives the first bevel gear to rotate, the first bevel gear drives the second bevel gear to rotate as the first bevel gear is meshed with the second bevel gear, the second bevel gear drives the third bevel gear on two sides to rotate in opposite directions, the third bevel gear drives the fourth bevel gear to rotate, and the fourth bevel gear drives the first fixed disk to rotate, so that the movable block slides in the through hole, the second fixed disk rotates, the size of opening and closing can be accurately controlled through the indicating rod and the angle ruler, the flow is controlled, the impact on equipment is reduced, and the service life of the valve clack is prolonged.

However, in the use process of the above-mentioned existing valve, for the hard seal butterfly valve, the sealing performance is a very important performance which is also very valued by users, and the hard seal butterfly valve which loses the sealing performance can be basically discarded. In many failure types of the hard seal butterfly valve, the untight closing of the valve is an important reason causing the hard seal butterfly valve to lose the sealing performance, and is also a common reason and a reason which is easy to find and solve.

Disclosure of Invention

The invention aims to provide a novel industrial butterfly valve structure, which aims to solve the problem that in the use process of the valve proposed in the background art, the sealing performance of a hard sealing butterfly valve is a very important performance which is also very important by users, and the hard sealing butterfly valve losing the sealing performance can be basically discarded. In many fault types of hard seal butterfly valves, the untight closing of the valve is an important reason causing the hard seal butterfly valve to lose the sealing performance, and is also a common and easily found reason.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides a novel industry butterfly valve structure, includes the valve body, the valve body is cylindricly, still sets up the valve plate in the valve body inboard including rotating, the shaft hole has been seted up on the valve body, the shaft hole internal rotation is connected with the valve rod, it is fixed to joint each other between valve rod and the valve plate, the inboard of valve body is provided with the disk seat, it is sealed to cooperate each other between valve plate and the disk seat, the valve plate is metal disc shape, the side of valve plate is seted up and is put the ring channel, the ring channel is embedded to have solid fixed ring, bolt fixedly connected with clamp plate is passed through to solid fixed ring's one side, the disk seat includes solid fixed disk seat and movable valve seat, gu the fixed disk seat sets up the inside at the valve body, movable valve seat slides and sets up the inside at the valve body, movable valve seat is located one side of solid fixed valve seat.

As a preferred embodiment of the present invention: a sealing assembly is arranged on the outer side of the valve rod;

the sealing assembly comprises a sealing sleeve sleeved on the valve rod, the sealing sleeve is embedded in the shaft hole, a packing ring is filled in the sealing sleeve, an O-shaped sealing ring is clamped on the upper side of the sealing sleeve, the O-shaped sealing ring is located on the outer side of the packing ring, a T-shaped ring is inserted into the upper portion of the sealing sleeve located on the O-shaped sealing ring, the T-shaped ring is fixedly connected with the sealing sleeve through a bolt, and the T-shaped ring is sleeved on the outer side of the valve rod.

As a preferred embodiment of the present invention: a fixing assembly for fixing the valve rod is arranged on the outer side of the valve body;

the fixed assembly comprises a fixed rod arranged on the outer side of the valve body, a flange plate is fixedly connected to the upper portion of the fixed rod, a bearing seat is fixedly mounted on the flange plate, the valve rod is mounted on an inner ring of the bearing seat, one end of the valve rod is connected with a coupler, and the coupler is in transmission connection with an actuator.

As a preferred embodiment of the present invention: the solid fixed valve seat is the ring form, and solid fixed valve seat's side has seted up solid fixed ring groove, gu fixed ring inslot has inlayed rubber seal, rubber seal's outer fringe is provided with the round bulge loop, gu fixed ring inslot intercommunication has seted up the caulking groove, rubber seal's bulge loop inlays in the caulking groove, rubber seal's side is provided with the arc arch, the bellied inboard of arc is hollow state, form an air bag structure between arc arch and the rubber seal.

As a preferred embodiment of the present invention: the movable valve seat is characterized in that a mounting groove is formed in the outer edge face of the movable valve seat, a rubber ring is mounted in the mounting groove, a round groove is formed in the side face of the movable valve seat, a round pressing ring is fixedly mounted in the round groove and located on one side of the arc protrusion, and the pressing ring is used for pressing the arc protrusion.

As a preferred embodiment of the present invention: the cross-sectional shape of activity disk seat is oblique trapezoidal, first spring groove has been seted up to the side of activity disk seat, the second spring groove has been seted up to the side of fixed disk seat, install the spring between first spring groove and the second spring groove, the one end fixed connection of spring is on fixed disk seat, the other end fixed connection of spring is on the activity disk seat.

As a preferred embodiment of the present invention: be provided with the strengthening rib on the valve plate, the strengthening rib is the arc setting.

As a preferred embodiment of the present invention: the actuator comprises a driving motor, an output shaft is fixedly connected to the output end of the driving motor, a worm wheel is coaxially connected to the output shaft, a worm is connected to the coupler, the worm wheel and the worm are connected in a meshed mode, the outer end of the worm is connected with a rotating handle, and a ratchet mechanism is arranged on the worm.

As a preferred embodiment of the present invention: the ratchet mechanism comprises a ratchet wheel coaxially arranged on the worm, a pawl is clamped on one side of the ratchet wheel, a swing rod is fixedly connected to one side of the pawl, the other end of the swing rod is rotatably connected with a fixing shaft, and a limit switch is connected to one side of the swing rod.

The invention has the beneficial effects that:

1. install the butterfly valve on the pipeline, through the driving motor who sets up, can drive the rotation of output shaft, the output shaft drives the rotation of worm wheel, worm wheel rotation can drive the worm and rotate, the worm can drive the rotation of valve rod, thereby realize the switching of valve plate, because driving motor does not have self-locking function, drive the closed back of valve plate at driving motor, need continuously give a power of valve plate, just enable the valve plate and be in closed state always, the ratchet that sets up can lock the valve rod, prevent to move back, realize long-time closed state.

2. After the movable valve seat moves under the pressure of a medium in the pipeline, the movable valve seat moves towards one side to enable the movable valve seat to be attached to the side face of the fixed valve seat, the pressing ring on the side face of the movable valve seat can be in contact with the arc-shaped protrusion, and the pressing ring can be a metal ring, the arc-shaped protrusion is made of rubber and is of an inner side air bag structure, so that the pressing ring can press the arc-shaped protrusion into the air bag structure; when the medium in the pipeline does not exert pressure to movable valve seat, movable valve seat is because the effect automatic re-setting of spring elastic force, after movable valve seat resets, because the inside packing of gasbag structure has the air, can make the arc protruding original state that resumes once more, and the arc protruding makes recovering original state, has certain elasticity, can realize sealing on the one hand, and on the other hand the arc is protruding when resuming, can bounce once, can shake the impurity on the rubber seal circle, prevents impurity influence as far as possible and seals.

Drawings

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

FIG. 2 is a first structural diagram of the present invention;

FIG. 3 is a second schematic structural view of the present invention;

FIG. 4 is a schematic cross-sectional structural view of the present invention;

FIG. 5 is an enlarged view of the structure at A in FIG. 4 according to the present invention;

FIG. 6 is a schematic cross-sectional view of a valve plate according to the present invention;

FIG. 7 is a cross-sectional view of the valve seat of the present invention;

FIG. 8 is an enlarged view of the structure of the invention at B in FIG. 7;

FIG. 9 is an enlarged view of the structure of FIG. 7 at C;

FIG. 10 is a schematic view of the worm gear and worm of the present invention;

FIG. 11 is a schematic view of a ratchet mechanism according to the present invention;

FIG. 12 is a schematic view of the movable valve seat and the fixed valve seat of the present invention.

In the figure: 1. a valve body; 2. a valve plate; 21. an annular groove; 22. a fixing ring; 23. pressing a plate; 24. reinforcing ribs; 3. a valve stem; 4. a valve seat; 41. a fixed ring groove; 42. a rubber seal ring; 43. a convex ring; 44. caulking grooves; 45. an arc-shaped bulge; 46. an air bag structure; 5. a seal assembly; 51. sealing sleeves; 52. a packing ring; 53. an O-ring seal; 54. a T-shaped ring; 6. a fixing assembly; 61. fixing the rod; 62. a flange plate; 63. a bearing seat; 7. a coupling; 8. a movable valve seat; 81. mounting grooves; 82. a rubber ring; 83. a circular groove; 84. pressing a ring; 85. a first spring groove; 86. a second spring groove; 9. a spring; 10. a drive motor; 101. an output shaft; 102. a worm gear; 103. a worm; 104. rotating the handle; 11. a ratchet mechanism; 111. a ratchet wheel; 112. a pawl; 113. a swing rod; 114. a fixed shaft; 12. a fixed valve seat; 13. and the shaft hole.

Detailed Description

Examples

Please refer to fig. 1-12, the present application provides a novel industrial butterfly valve structure, including a valve body 1, the valve body 1 is cylindrical, both sides of the valve body 1 are provided with flange structures for installing on a pipeline, further including a valve plate 2 rotatably arranged at the inner side of the valve body 1, the valve plate 2 is provided with a reinforcing rib 24, the reinforcing rib 24 is arc-shaped, the valve plate 2 is made of steel and is circular, the reinforcing rib 24 is arranged, so that the valve plate 2 can bear larger pressure, and in order to reduce resistance, the reinforcing rib 24 is arranged in an arc shape, a shaft hole 13 is formed in the valve body 1, a valve rod 3 is rotatably connected in the shaft hole 13, the valve rod 3 and the valve plate 2 are mutually clamped and connected, and then are fixed through bolts.

The inboard of valve body 1 is provided with disk seat 4, it is sealed to mutually support between valve plate 2 and the disk seat 4, valve plate 2 is the metal disc shape, in order to improve the sealed effect of valve plate 2 and disk seat 4 contact surface, ring channel 21 has been seted up to the side of valve plate 2, ring channel 21 is embedded to have solid fixed ring 22, gu fixed ring 22 is the carbide material, bolt fixedly connected with clamp plate 23 is passed through to one side of solid fixed ring 22, clamp plate 23 can push down solid fixed ring 22 fixedly, disk seat 4 includes solid fixed disk seat 12 and movable valve seat 8, gu fixed disk seat 12 sets up the inside at valve body 1, movable valve seat 8 slides and sets up the inside at valve body 1, movable valve seat 8 is located one side of solid fixed disk seat 12.

Among the prior art the disk seat generally all adopts fixed form to set up in valve body 1, be provided with round rubber seal or tetrachloroethylene sealing washer outside the disk seat, valve plate 2 presses when closed and realizes sealedly on rubber seal or tetrachloroethylene sealing washer, but in the long-time use, for example, carry quality of water, the aquatic contains slight grit, slight grit enters into rubber seal or tetrachloroethylene sealing washer after, make rubber seal or tetrachloroethylene sealing washer wearing and tearing easily at the in-process of rotating valve plate 2, influence the use, and the service life is prolonged.

Be provided with a movable valve seat 8 in this application, movable valve seat 8 covers in the outside of valve plate 2, is located between valve plate 2 and the valve body 1, and movable valve seat 8 can remove in valve body 1, receives the pressure of medium in the pipeline after movable valve seat 8, can remove to one side, makes movable valve seat 8's one side and the contact of solid fixed valve seat 12, vacates a space that supplies valve plate 2 pivoted, greatly reduced the wearing and tearing to the disk seat when valve plate 2 rotates, improve life.

When the butterfly valve is used, the position where leakage is most likely to occur is on the contact surface of the valve rod 3 penetrating through the valve body 1;

the sealing assembly 5 is arranged on the outer side of the valve rod 3; the sealing assembly 5 comprises a sealing sleeve 51 sleeved on the valve rod 3, the sealing sleeve 51 is embedded in the shaft hole 13, a packing ring 52 is filled in the sealing sleeve 51, an O-shaped sealing ring 53 is clamped on the upper side of the sealing sleeve 51, the O-shaped sealing ring 53 is positioned on the outer side of the packing ring 52, a T-shaped ring 54 is inserted above the sealing sleeve 51 positioned on the O-shaped sealing ring 53, the T-shaped ring 54 is fixedly connected with the sealing sleeve 51 through a bolt, and the T-shaped ring 54 is sleeved on the outer side of the valve rod 3, so that the sealing effect of the valve rod 3 can be improved, and the risk of leakage is reduced.

A fixing component 6 for fixing the valve rod 3 is arranged on the outer side of the valve body 1; the fixing assembly 6 comprises a fixing rod 61 arranged on the outer side of the valve body 1, a flange plate 62 is fixedly connected above the fixing rod 61, a bearing seat 63 is fixedly installed on the flange plate 62, the valve rod 3 is installed on the inner ring of the bearing seat 63, one end of the valve rod 3 is connected with a coupler 7, the coupler 7 is in transmission connection with an actuator, the actuator comprises a driving motor 10, the driving motor 10 is a forward and reverse rotating motor, an output shaft 101 is fixedly connected to the output end of the driving motor 10, a worm wheel 102 is coaxially connected to the output shaft 101, a worm 103 is connected to the coupler 7, the worm wheel 102 is in meshing connection with the worm 103, the outer end of the worm 103 is connected with a rotating handle 104, and a ratchet mechanism 11 is arranged on the worm 103;

the ratchet mechanism 11 comprises a ratchet wheel 111 coaxially arranged on the worm 103, a pawl 112 is clamped on one side of the ratchet wheel 111, a swing rod 113 is fixedly connected on one side of the pawl 112, a fixed shaft 114 is rotatably connected at the other end of the swing rod 113, and a limit switch is connected on one side of the swing rod 113.

Through the driving motor 10 who sets up, can drive the rotation of output shaft 101, output shaft 101 drives the rotation of worm wheel 102, and worm wheel 102 rotates can drive worm 103 and rotates, and worm 103 can drive the rotation of valve rod 3 to realize the switching of valve plate 2.

Because driving motor 10 does not have self-locking function, drives 2 closed backs of valve plate at driving motor 10, need continuously give 2 power of valve plate, just enable valve plate 2 and be in closed state always, the ratchet 11 that this application set up can prevent to move back valve rod 3 locking, realizes long-time closed condition.

In the process of using the valve, the sealing performance is a very important performance for the hard sealing butterfly valve, which is also very important to the user, and the hard sealing butterfly valve losing the sealing performance can be basically discarded. In many fault types of hard seal butterfly valves, the untight closing of the valve is an important reason causing the hard seal butterfly valve to lose the sealing performance, and is also a common reason and a reason which is easy to find and solve.

Block the problem of sealed face to impurity, the solid fixed valve seat 12 of this application is the ring form, and solid fixed valve seat 12's side has seted up fixed ring groove 41, fixed ring groove 41 is embedded to have rubber seal 42, rubber seal 42's outer fringe is provided with a round bulge loop 43, caulking groove 44 has been seted up to fixed ring groove 41 in-connection, rubber seal 42's bulge loop 43 inlays in caulking groove 44, rubber seal 42's side is provided with arc arch 45, arc arch 45's inboard is hollow state, form an air bag structure 46 between arc arch 45 and the rubber seal 42.

Mounting groove 81 has been seted up on the outer fringe face of activity disk seat 8, install rubber ring 82 in the mounting groove 81, round slot 83 has been seted up to the side of activity disk seat 8, fixed mounting has round clamping ring 84 in the round slot 83, clamping ring 84 is located the protruding 45 one side of arc, clamping ring 84 is used for compressing tightly the protruding 45 of arc, the cross-sectional shape of activity disk seat 8 is oblique trapezoidal, first spring groove 85 has been seted up to the side of activity disk seat 8, second spring groove 86 has been seted up to the side of unable adjustment disk seat 12, install spring 9 between first spring groove 85 and the second spring groove 86, spring 9's one end fixed connection is on unable adjustment disk seat 12, spring 9's other end fixed connection is on activity disk seat 8.

The problem is solved: in the application, after the movable valve seat 8 is moved by the pressure of a medium in a pipeline, the movable valve seat 8 moves to one side, so that the movable valve seat 8 is attached to the side surface of the fixed valve seat 12, the pressing ring 84 on the side surface of the movable valve seat 8 can be contacted with the arc-shaped protrusion 45, because the pressing ring 84 is a metal ring, the arc-shaped protrusion 45 is made of rubber, and the inner side air bag structure 46 of the arc-shaped protrusion 45, the pressing ring 84 can press the arc-shaped protrusion 45 to be compressed into the air bag structure 46, when the medium in the pipeline does not apply pressure on the movable valve seat 8, the movable valve seat 8 automatically resets under the action of the elastic force of the spring 9, after the movable valve seat 8 resets, because the air is filled in the air bag structure 46, the arc-shaped protrusion 45 can restore the original state again, and the arc-shaped protrusion 45 has certain elasticity when restoring the original state;

the arc-shaped protrusion 45 is made of rubber materials and has certain elasticity, on one hand, sealing can be achieved, on the other hand, the arc-shaped protrusion 45 can be bounced once when being recovered, impurities on the rubber sealing ring 42 can be shaken off, and the influence of the impurities on sealing is prevented as much as possible.

The working principle is as follows:

when the butterfly valve is used, the butterfly valve is installed on a pipeline, the rotation of the output shaft 101 can be driven through the arranged driving motor 10, the output shaft 101 drives the worm gear 102 to rotate, the worm gear 102 rotates to drive the worm 103 to rotate, the worm 103 can drive the valve rod 3 to rotate, so that the valve plate 2 is opened and closed, the arranged ratchet mechanism 11 can lock the valve rod 3 to prevent the valve rod 3 from moving back, and a long-time closed state is realized; when the medium in the pipeline does not exert pressure to activity disk seat 8, activity disk seat 8 is because the effect automatic re-setting of spring 9 elasticity, after activity disk seat 8 resets, because the inside packing of gasbag structure 46 has the air, can make arc arch 45 resume original state again, and arc arch 45 makes at the state that resumes, has certain elasticity, can realize sealing on the one hand, on the other hand arc arch 45 is when resuming, can bounce once, can shake the impurity on the rubber seal 42, prevent as far as possible that impurity from influencing sealedly.

Claims

1. The utility model provides a novel industry butterfly valve structure, includes valve body (1), valve body (1) is cylindricly, still sets up valve plate (2) inboard at valve body (1) including rotating, its characterized in that, shaft hole (13) have been seted up on valve body (1), shaft hole (13) internal rotation is connected with valve rod (3), mutual joint is fixed between valve rod (3) and valve plate (2), the inboard of valve body (1) is provided with disk seat (4), it is sealed to mutually support between valve plate (2) and disk seat (4), valve plate (2) are metal disc shape, the side of valve plate (2) is seted up and is put ring channel (21), the ring channel (21) is embedded to have solid fixed ring (22), bolt fixedly connected with clamp plate (23) is passed through to one side of solid fixed ring (22), disk seat (4) are including solid fixed disk seat (12) and activity disk seat (8), gu fixed disk seat (12) set up the inside at valve body (1), activity disk seat (8) slide and set up the inside at valve body (1), activity disk seat (8) are located one side of solid fixed disk seat (12).

2. The novel industrial butterfly valve structure of claim 1, wherein: a sealing assembly (5) is arranged on the outer side of the valve rod (3);

seal assembly (5) is including cover seal cover (51) on valve rod (3), seal cover (51) inlays in shaft hole (13), it has packing ring (52) to fill on seal cover (51), the upside joint of seal cover (51) has O shape sealing ring (53), O shape sealing ring (53) are located the outside of packing ring (52), it has T shape ring (54) to peg graft in the top that seal cover (51) are located O shape sealing ring (53), through bolt fixed connection between T shape ring (54) and seal cover (51), T shape ring (54) cover is in the outside of valve rod (3).

3. The novel industrial butterfly valve structure of claim 1, wherein: a fixing component (6) for fixing the valve rod (3) is arranged on the outer side of the valve body (1);

fixed subassembly (6) are including setting up dead lever (61) in valve body (1) outside, the top fixedly connected with flange board (62) of dead lever (61), fixed mounting has bearing frame (63) on flange board (62), the inner circle at bearing frame (63) is installed in valve rod (3), the one end of valve rod (3) is connected with shaft coupling (7), the transmission is connected between shaft coupling (7) and the executor.

4. The novel industrial butterfly valve structure according to claim 1, wherein: the fixing valve seat (12) is in a ring shape, and fixing valve seat (12) side has seted up fixed annular groove (41), fixed annular groove (41) are embedded to have rubber seal (42), the outer fringe of rubber seal (42) is provided with round bulge loop (43), caulking groove (44) have been seted up to fixed annular groove (41) in-connection, bulge loop (43) of rubber seal (42) inlay in caulking groove (44), the side of rubber seal (42) is provided with arc arch (45), the inboard of arc arch (45) is hollow state, form an air bag structure (46) between arc arch (45) and rubber seal (42).

5. The novel industrial butterfly valve structure according to claim 4, wherein: mounting groove (81) have been seted up on the outer fringe face of activity disk seat (8), install rubber ring (82) in mounting groove (81), round groove (83) have been seted up to the side of activity disk seat (8), fixed mounting has round clamping ring (84) in round groove (83), clamping ring (84) are located one side of arc arch (45), clamping ring (84) are used for compressing tightly arc arch (45).

6. The novel industrial butterfly valve structure according to claim 5, wherein: the cross-sectional shape of activity disk seat (8) is oblique trapezoidal, first spring groove (85) have been seted up to the side of activity disk seat (8), second spring groove (86) have been seted up to the side of stationary valve seat (12), install spring (9) between first spring groove (85) and second spring groove (86), the one end fixed connection of spring (9) is on stationary valve seat (12), the other end fixed connection of spring (9) is on activity disk seat (8).

7. The novel industrial butterfly valve structure of claim 1, wherein: the valve plate (2) is provided with a reinforcing rib (24), and the reinforcing rib (24) is arranged in an arc shape.

8. The novel industrial butterfly valve structure according to claim 3, wherein: the actuator comprises a driving motor (10), an output shaft (101) is fixedly connected to the output end of the driving motor (10), a worm wheel (102) is coaxially connected to the output shaft (101), a worm (103) is connected to the coupler (7), the worm wheel (102) and the worm (103) are connected in a meshed mode, a rotating handle (104) is connected to the outer end of the worm (103), and a ratchet mechanism (11) is arranged on the worm (103).

9. The novel industrial butterfly valve structure according to claim 8, wherein: ratchet mechanism (11) are including ratchet (111) of coaxial setting on worm (103), one side joint of ratchet (111) has pawl (112), one side fixedly connected with pendulum rod (113) of pawl (112), the other end of pendulum rod (113) rotates and is connected with fixed axle (114), one side of pendulum rod (113) is connected with limit switch.