A flange hard seal butterfly valve

Abstract

The present invention relates to the technical field of butterfly valves, and discloses a flange hard-sealed butterfly valve, comprising a butterfly valve body and a handle, a worm gear box is fixedly installed on the top of the butterfly valve body, the output end of the worm gear box is transmission-connected to the valve stem in the butterfly valve body, and a locking mechanism is arranged between the input end of the worm gear box and the handle; the locking mechanism comprises a box body, a rotating shaft 1, a mounting plate, and a sliding rod, the box body is fixedly installed on the front side of the worm gear box, the rear end of the rotating shaft 1 is transmission-connected to the input end of the worm gear box, before the handle is pushed to move backward, the teeth cannot mesh with the gear 1, at this time, whether the handle is impacted or accidentally turned by the worker, the gear 1 cannot be driven to rotate through the connecting rod, the locking sleeve, and the teeth, thereby avoiding the problem that the handle is impacted and rotated, thereby causing the valve stem in the butterfly valve body to rotate, and also avoiding the problem that the teeth and the gear 1 are damaged when the handle is rotated by hard force.

Description

Technical Field

[0001] The invention relates to the technical field of butterfly valves, in particular to a flange hard-sealed butterfly valve. Background Art

[0002] The flange hard-seal butterfly valve is one of the many types of butterfly valves. In the use of the flange hard-seal butterfly valve, the opening and closing of the butterfly valve is often controlled by manually turning the handwheel. However, when the handwheel is impacted by external force, it will rotate, causing the butterfly valve to change from a closed state to an open state. Although the existing butterfly valves are also provided with a locking structure to prevent accidental touch and used to lock the handwheel, for workers who are not familiar with the operation, it is easy to forcibly turn the handwheel when the handwheel is locked, thereby causing damage to the locking structure. How to prevent the handwheel from being impacted and rotating, and how to prevent the worker from forcibly turning the handwheel and causing damage to the locking structure are the key points of the existing butterfly valve design. Summary of the invention

[0003] The object of the present invention is to provide a flange hard-sealed butterfly valve to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: a flange hard-sealed butterfly valve, comprising a butterfly valve body and a handle, a worm gear box is fixedly installed on the top of the butterfly valve body, the output end of the worm gear box is drivingly connected to the valve stem in the butterfly valve body, and a locking mechanism is provided between the input end of the worm gear box and the handle;

[0005] The locking mechanism comprises a box body, a rotating shaft, a mounting plate, and a sliding rod, the box body is fixedly installed on the front side of the worm gear box, the rear end of the rotating shaft is transmission connected to the input end of the worm gear box, the front side of the mounting plate is rotatably connected with a locking sleeve through a bearing, the outer wall of the rotating shaft is fixedly installed with a gear one, the locking sleeve covers the outside of the gear one, the inner side of the locking sleeve is fixedly provided with teeth, the teeth are meshed with the gear one, and the teeth are close to the front end of the locking sleeve, and the position of the locking sleeve near the rear end is not provided with teeth, the rear end of the sliding rod is fixedly connected to the front side of the worm gear box, the mounting plate sliding sleeve is arranged on the sliding rod, the front end of the sliding rod is provided with an integrally formed convex plate, and the diameter of the convex plate is larger than the diameter of the sliding rod, the back side of the mounting plate is fixedly installed with a spring, the rear end of the spring is fixedly connected to the front side of the worm gear box, the front side of the locking sleeve is fixedly installed with a connecting rod, and the front end of the connecting rod is fixedly connected to the back side of the handle;

[0006] The box body is provided with a display mechanism.

[0007] Furthermore, a through hole is opened in the center of the mounting plate, and the inner diameter of the through hole is larger than the outer diameter of gear one, the connecting rod is a hollow rod, and the inside of the connecting rod is connected to the inside of the locking sleeve, and the outer diameter of the rotating shaft one is smaller than the inner diameter of the connecting rod.

[0008] Furthermore, the front end of the connecting rod movably penetrates the front side of the box body, and a smooth sleeve is fixedly installed at the position where the connecting rod penetrates the box body, and the smooth sleeve is slidably sleeved on the connecting rod.

[0009] Furthermore, four sliding rods are provided and respectively penetrate through four corners of the mounting plate, and four springs are provided and correspond one to one with the sliding rods.

[0010] Furthermore, the display mechanism includes a pointer and gear three, the pointer is fixedly mounted on the right side surface of the box body, a worm is fixedly mounted on the inner wall of the gear three, the rear end of the worm is rotatably connected to the front side of the worm gear box through a bearing, the gear three is meshed with gear four, the gear four is fixedly mounted on a rotating shaft one, the worm is meshed with a worm wheel, a rotating shaft two is fixedly mounted on the inner wall of the worm wheel, the right end of the rotating shaft two passes through the inner wall of the box body through a bearing, a scale ring is fixedly mounted on the right end of the rotating shaft two, and the scale ring is located below the pointer.

[0011] Furthermore, the gear four is located behind the gear one, and the specifications of the gear four are consistent with the specifications of the rotating shaft one.

[0012] Furthermore, the worm and the mounting plate are staggered, and a gap is left between the left side of the scale ring and the right side of the box.

[0013] Furthermore, a grip is fixedly mounted on the outer wall of the handle, three grips are provided and distributed in a circular array on the handle, and the outer wall of the grip is provided with anti-slip grooves.

[0014] Furthermore, a shell is fixedly installed on the right outer wall of the box body, and a screw rod is rotatably connected to the bottom inner wall of the shell through a bearing, a bevel gear 2 is fixedly installed on the outer wall of the screw rod, and the bevel gear 2 is meshed with a bevel gear 1, and the bevel gear 1 is fixedly installed at the right end of the rotating shaft 2. A lifting plate is provided on the threaded sleeve on the outer wall of the screw rod, and the top end of the lifting plate movably passes through the top of the shell, and a scale mark is provided on the front side of the lifting plate.

[0015] Furthermore, a second smooth sleeve is fixedly installed at the position where the shell is penetrated by the lifting plate, and the second smooth sleeve is slidably mounted on the lifting plate, and the scale mark is a groove scale.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. Before the handle is pushed backward, the teeth cannot mesh with gear 1. At this time, whether the handle is impacted or turned by the worker by mistake, the connecting rod, locking sleeve and teeth cannot drive gear 1 to rotate. This avoids the problem of the handle being impacted and rotating, which may cause the valve stem in the butterfly valve body to rotate, and also avoids the problem of the teeth and gear 1 being damaged when the handle is turned by force.

[0018] 2. The handle and the locking sleeve are connected by a connecting rod. When the handle is turned, it can push the handle to move backward, thereby driving the connecting rod and the locking sleeve to move backward. After the teeth in the locking sleeve are engaged with gear 1, the handle is turned to drive the connecting rod to rotate, thereby driving the locking sleeve to rotate. The teeth can drive gear 1 to rotate, thereby driving shaft 1 to rotate. The power on shaft 1 is transmitted to the valve stem through the worm gear box, thereby opening and closing the valve plate.

[0019] 3. When the shaft 1 rotates, the power can be transmitted to the valve stem of the butterfly valve body through the worm gear box, thereby controlling the opening and closing of the valve plate. At the same time, the rotation of the shaft 1 can drive the gear 4 to rotate, thereby driving the gear 3 to rotate. The rotation of the gear 3 drives the worm to rotate, thereby driving the worm wheel to rotate. The rotation of the worm wheel drives the shaft 2 to rotate, thereby driving the scale ring to rotate. The pointer points to the scale of the scale ring to display the opening and closing degree of the valve plate.

[0020] 4. When the rotating shaft 2 rotates, it can be transmitted through the bevel gear 1 and the bevel gear 2, and then drive the screw to rotate. The rotation of the screw causes the lifting plate to move up and down. The opening and closing degree of the valve plate is displayed by the smooth sleeve 2 on the lifting plate. Compared with the display through the pointer and scale ring on the side of the box, the smooth sleeve 2 on the front of the lifting plate is directly used for display, which is more convenient for workers to observe. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0022] Figure 2 For the present invention Figure 1 The structural diagram of the left side view;

[0023] Figure 3 It is a structural schematic diagram of the locking mechanism of the present invention;

[0024] Figure 4 For the present invention Figure 3 A schematic diagram of the structure in a top cutaway view;

[0025] Figure 5 It is a schematic diagram of the internal structure of the box body of the present invention;

[0026] Figure 6 It is a structural schematic diagram of the locking sleeve and the mounting plate of the present invention;

[0027] Figure 7 It is a structural schematic diagram of the display mechanism of the present invention;

[0028] Figure 8 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0029] Fig. 9 It is a schematic diagram of the structure of the internal structure of the housing of the present invention;

[0030] Fig.10 It is a structural schematic diagram of the lifting plate and scale mark of the present invention.

[0031] In the figure: 1. butterfly valve body; 2. worm gear box; 3. locking mechanism; 301. box body; 302. shaft one; 303. gear one; 304. connecting rod; 305. locking sleeve; 306. teeth; 307. mounting plate; 308. spring; 309. slide rod; 4. display mechanism; 401. pointer; 402. gear three; 403. worm; 404. gear four; 405. shaft two; 406. scale ring; 407. worm gear; 5. handle; 6. grip; 7. smooth sleeve one; 8. housing; 9. bevel gear one; 10. bevel gear two; 11. screw; 12. lifting plate; 13. smooth sleeve two; 14. scale mark. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0033] Embodiment 1

[0034] See also Figure 1-Figure 7 The present invention provides a technical solution: a flange hard-sealed butterfly valve, comprising a butterfly valve body 1 and a handle 5, a worm gear box 2 is fixedly installed on the top of the butterfly valve body 1, the output end of the worm gear box 2 is drivingly connected to the valve stem in the butterfly valve body 1, and a locking mechanism 3 is arranged between the input end of the worm gear box 2 and the handle 5;

[0035] The locking mechanism 3 includes a box body 301, a rotating shaft 302, a mounting plate 307, and a slide rod 309. The box body 301 is fixedly mounted on the front of the worm gear box 2. The rear end of the rotating shaft 302 is drivingly connected to the input end of the worm gear box 2. The front of the mounting plate 307 is rotatably connected with a locking sleeve 305 through a bearing. A gear 303 is fixedly mounted on the outer wall of the rotating shaft 302. The locking sleeve 305 covers the outside of the gear 303. A tooth 306 is fixedly arranged on the inner side of the locking sleeve 305. The tooth 306 is meshed with the gear 303, and the tooth 306 is close to the front end of the locking sleeve 305. The position of the locking sleeve 305 near the rear end is not provided. The teeth 306 and the rear end of the slide rod 309 are fixedly connected to the front of the worm gear box 2. The mounting plate 307 is slidably sleeved on the slide rod 309. The front end of the slide rod 309 is provided with an integrally formed convex plate, and the diameter of the convex plate is larger than the diameter of the slide rod 309. The back of the mounting plate 307 is fixedly installed with a spring 308. The rear end of the spring 308 is fixedly connected to the front of the worm gear box 2. The front of the locking sleeve 305 is fixedly installed with a connecting rod 304. The front end of the connecting rod 304 is fixedly connected to the back of the handle 5. The handle 5 and the locking sleeve 305 are connected by the connecting rod 304. When rotating, the handle 5 can be pushed to move backward, thereby driving the connecting rod 304 to move backward. The connecting rod 304 and the locking sleeve 305 move backwards, and after the teeth 306 in the locking sleeve 305 mesh with the gear 1 303, the handle 5 is turned to drive the connecting rod 304 to rotate, and then the locking sleeve 305 is driven to rotate, and the teeth 306 can drive the gear 1 303 to rotate, and then drive the rotating shaft 1 302 to rotate. The power on the rotating shaft 1 302 is transmitted to the valve stem through the worm gear box 2, and then the valve plate is opened and closed. Before the handle 5 is pushed to move backwards, the teeth 306 cannot mesh with the gear 1 303. At this time, the handle 5 is impacted or turned by mistake by the worker, and it cannot be driven by the connecting rod 304, the locking sleeve 305, and the teeth 306. The movable gear 1 303 rotates, which prevents the handle 5 from being impacted and rotating, thereby causing the valve stem in the butterfly valve body 1 to rotate, and also prevents the problem of the teeth 306 and the gear 1 303 being damaged when the handle 5 is rotated by force. The sliding rod 309 is provided to limit the mounting plate 307, so that the mounting plate 307 can only move forward and backward relative to the worm gear box 2. The spring 308 is provided to push the mounting plate 307 forward, and then push the locking sleeve 305 forward, so that the teeth 306 in the locking sleeve 305 are separated from the gear 1 303, that is, without forcing the handle 5 to move backward, the teeth 306 will not mesh with the gear 1 303;

[0036] The box body 301 is provided with a display mechanism 4;

[0037] A through hole is provided at the center of the mounting plate 307, and the inner diameter of the through hole is larger than the outer diameter of the gear 1 303, so that the mounting plate 307 will not contact or collide with the gear 1 303 during the forward and backward movement. The connecting rod 304 is a hollow rod, and the interior of the connecting rod 304 is connected to the interior of the locking sleeve 305. The outer diameter of the rotating shaft 1 302 is smaller than the inner diameter of the connecting rod 304, so that when the connecting rod 304 moves backward, the front end of the rotating shaft 1 302 can normally extend into the connecting rod 304, thereby preventing the rotating shaft 1 302 from hindering the backward movement of the connecting rod 304.

[0038] The front end of the connecting rod 304 movably penetrates the front face of the box body 301, so that the handle 5 is arranged outside the box body 301. When the handle 5 is turned, there is no need to open the box body 301. A smooth sleeve 7 is fixedly installed at the part of the box body 301 penetrated by the connecting rod 304. The smooth sleeve 7 is slidably sleeved on the connecting rod 304, so that when the connecting rod 304 slides back and forth relative to the box body 301, it will not rub against the inner wall of the box body 301, thereby preventing the inner wall of the box body 301 from being worn;

[0039] There are four slide bars 309, which respectively pass through the four corners of the mounting plate 307. There are four springs 308, which correspond to the slide bars 309 one by one. The four slide bars 309 are set to limit the mounting plate 307 from the four corners to ensure that the mounting plate 307 does not tilt when moving forward and backward.

[0040] The display mechanism 4 includes a pointer 401 and a gear three 402. The pointer 401 is fixedly mounted on the right side surface of the box body 301. A worm 403 is fixedly mounted on the inner wall of the gear three 402. The rear end of the worm 403 is rotatably connected to the front side of the worm gear box 2 through a bearing. The gear three 402 is meshed with a gear four 404. The gear four 404 is fixedly mounted on the rotating shaft one 302. The worm 403 is meshed with a worm wheel 407. A rotating shaft two 405 is fixedly mounted on the inner wall of the worm wheel 407. The right end of the rotating shaft two 405 passes through the inner wall of the box body 301 through a bearing. A scale ring 406 is fixedly mounted on the right end of the rotating shaft two 405. The scale ring 406 is located below the pointer 401 and can be rotated when the rotating shaft one 302 rotates. The power is transmitted to the valve stem of the butterfly valve body 1 through the worm gear box 2, thereby controlling the opening and closing of the valve plate. At the same time, the rotation of the shaft 1 302 can drive the gear 404 to rotate, thereby driving the gear 3 402 to rotate. The rotation of the gear 3 402 drives the worm 403 to rotate, thereby driving the worm wheel 407 to rotate. The rotation of the worm wheel 407 drives the shaft 2 405 to rotate, thereby driving the scale ring 406 to rotate. The pointer 401 points to the scale of the scale ring 406 to display the opening and closing degree of the valve plate. The transmission of the worm 403 and the worm wheel 407 is used to ensure that when an external force impacts the scale ring 406, the scale ring 406 cannot reversely drive the shaft 2 405 to rotate, thereby failing to drive the shaft 1 302 to rotate.

[0041] The gear 404 is located behind the gear 1 303, and the specification of the gear 404 is consistent with the specification of the rotating shaft 1 302, so that the mounting plate 307 will not collide with the gear 404 when moving backward, thereby preventing the gear 404 from hindering the mounting plate 307 from moving backward;

[0042] The worm 403 is staggered with the mounting plate 307 to prevent the worm 403 from hindering the mounting plate 307 from moving backwards. A gap is left between the left side of the scale ring 406 and the right side of the box 301 so that the scale ring 406 will not rub against the outer wall of the box 301 when rotating.

[0043] A grip 6 is fixedly mounted on the outer wall of the handle 5 . Three grips 6 are provided and are distributed in a circular array on the handle 5 . The outer wall of the grip 6 is provided with anti-slip grooves. The grip 6 makes it easier to turn the handle 5 .

[0044] Working principle: When in use, when there is no external force pushing the handle 5 to move backward, the teeth 306 and the gear 1 303 are staggered. At this time, no matter whether the handle 5 is impacted by an external force or the worker turns the handle 5 by force, the force on the handle 5 cannot be transmitted from the teeth 306 to the gear 1 303, so that the rotating shaft 1 302 will not rotate, thereby avoiding the problem that the handle 5 is rotated by impact and then the valve stem in the butterfly valve body 1 rotates, and also avoiding the problem that the teeth 306 and the gear 1 303 are damaged when the handle 5 is rotated by force. When the butterfly valve body 1 needs to be opened and closed, it is only necessary to push the handle 5 backward, thereby driving the connecting rod 304 to move backward, and the connecting rod 304 moves backward to drive the locking sleeve 305 to move backward, so that the locking sleeve 305 is locked. The teeth 306 of the gear 1 303 are meshed with the gear 1 303. The handle 5 is turned to drive the connecting rod 304 to rotate, and then the locking sleeve 305 is driven to rotate. The teeth 306 can drive the gear 1 303 to rotate, and then the shaft 1 302 is driven to rotate. The power on the shaft 1 302 is transmitted to the valve stem through the worm gear box 2, and then the valve plate is opened and closed. When the shaft 1 302 rotates, it drives the gear 4 404 to rotate, and then drives the gear 3 402 to rotate. The rotation of the gear 3 402 drives the worm 403 to rotate, and then drives the worm wheel 407 to rotate. The rotation of the worm wheel 407 drives the shaft 2 405 to rotate, and then drives the scale ring 406 to rotate. The pointer 401 is used to point to the scale of the scale ring 406 to display the opening and closing degree of the valve plate.

[0045] Embodiment 2

[0046] See also Figure 8-Figure 10 The present invention provides a technical solution: a flange hard-sealed butterfly valve, comprising a butterfly valve body 1 and a handle 5, a worm gear box 2 is fixedly installed on the top of the butterfly valve body 1, the output end of the worm gear box 2 is drivingly connected to the valve stem in the butterfly valve body 1, and a locking mechanism 3 is arranged between the input end of the worm gear box 2 and the handle 5;

[0047] The locking mechanism 3 includes a box body 301, a rotating shaft 302, a mounting plate 307, and a slide bar 309. The box body 301 is fixedly mounted on the front of the worm gear box 2. The rear end of the rotating shaft 302 is drivingly connected to the input end of the worm gear box 2. The front of the mounting plate 307 is rotatably connected with a locking sleeve 305 through a bearing. A gear 303 is fixedly mounted on the outer wall of the rotating shaft 302. The locking sleeve 305 covers the outside of the gear 303. The inner side of the locking sleeve 305 is fixedly provided with teeth 306. The teeth 306 mesh with the gear 303, and the teeth 306 are close to the locking sleeve 309. 5, the position of the locking sleeve 305 near the rear end is not provided with teeth 306, the rear end of the slide rod 309 is fixedly connected to the front end of the worm gear box 2, the mounting plate 307 is slidably sleeved on the slide rod 309, the front end of the slide rod 309 is provided with an integrally formed convex plate, and the diameter of the convex plate is larger than the diameter of the slide rod 309, the back of the mounting plate 307 is fixedly installed with a spring 308, the rear end of the spring 308 is fixedly connected to the front end of the worm gear box 2, the front end of the locking sleeve 305 is fixedly installed with a connecting rod 304, and the front end of the connecting rod 304 is fixedly connected to the back of the handle 5;

[0048] The box body 301 is provided with a display mechanism 4;

[0049] A through hole is formed in the center of the mounting plate 307, and the inner diameter of the through hole is larger than the outer diameter of the gear 1 303. The connecting rod 304 is a hollow rod, and the inside of the connecting rod 304 is connected to the inside of the locking sleeve 305. The outer diameter of the rotating shaft 1 302 is smaller than the inner diameter of the connecting rod 304.

[0050] The front end of the connecting rod 304 movably penetrates the front side of the box body 301 , and a smooth sleeve 7 is fixedly installed at the position where the connecting rod 304 penetrates the box body 301 , and the smooth sleeve 7 is slidably sleeved on the connecting rod 304 .

[0051] There are four slide bars 309, which respectively pass through the four corners of the mounting plate 307, and there are four springs 308, which correspond to the slide bars 309 one by one.

[0052] The display mechanism 4 includes a pointer 401 and a gear three 402. The pointer 401 is fixedly mounted on the right side surface of the box body 301. A worm 403 is fixedly mounted on the inner wall of the gear three 402. The rear end of the worm 403 is rotatably connected to the front side of the worm gear box 2 through a bearing. The gear three 402 is meshed with a gear four 404. The gear four 404 is fixedly mounted on the rotating shaft one 302. The worm 403 is meshed with a worm wheel 407. A rotating shaft two 405 is fixedly mounted on the inner wall of the worm wheel 407. The right end of the rotating shaft two 405 passes through the inner wall of the box body 301 through a bearing. A shell 8 is fixedly mounted on the outer wall of the right side of the box body 301. The bottom inner wall of the shell 8 is rotatably connected to a screw rod 11 through a bearing. The outer wall of the screw rod 11 is fixedly mounted with a bevel gear 10, bevel gear 10 meshes with bevel gear 19, bevel gear 19 is fixedly mounted at the right end of shaft 405, the outer wall thread sleeve of screw rod 11 is provided with lifting plate 12, the top of lifting plate 12 movably penetrates the top of housing 8, and the front of lifting plate 12 is provided with scale mark 14, when shaft 405 rotates, it can be driven by bevel gear 19 and bevel gear 10, and then drive screw rod 11 to rotate, screw rod 11 rotates to make lifting plate 12 move up and down, and the opening and closing degree of valve plate is displayed by smooth sleeve 13 on lifting plate 12, compared with the display by pointer 401 and scale ring 406 on the side of box body 301, the smooth sleeve 13 on the front of lifting plate 12 is directly used for display, which is more convenient for workers to observe;

[0053] A second smooth sleeve 13 is fixedly installed at the place where the housing 8 is penetrated by the lifting plate 12. The second smooth sleeve 13 is slidably mounted on the lifting plate 12. The scale mark 14 is a groove scale. The second smooth sleeve 13 is provided to prevent the lifting plate 12 from causing excessive wear to the housing 8. The scale mark 14 is set as a groove scale to avoid the problem that the scale mark 14 hinders the lifting of the lifting plate 12.

[0054] The gear 404 is located behind the gear 1 303, and the specification of the gear 404 is consistent with the specification of the rotating shaft 1 302;

[0055] A grip 6 is fixedly mounted on the outer wall of the handle 5 . Three grips 6 are provided and distributed in a circular array on the handle 5 . The outer wall of the grip 6 is provided with anti-slip grooves.

[0056] Working principle: When in use, when there is no external force pushing the handle 5 to move backward, the teeth 306 and the gear 1 303 are staggered. At this time, no matter whether the handle 5 is impacted by an external force or the worker turns the handle 5 by force, the force on the handle 5 cannot be transmitted from the teeth 306 to the gear 1 303, so that the rotating shaft 1 302 does not rotate, thereby avoiding the problem that the handle 5 is rotated by impact and the valve stem in the butterfly valve body 1 rotates, and also avoiding the problem that the teeth 306 and the gear 1 303 are damaged when the handle 5 is rotated by force. When the butterfly valve body 1 needs to be opened and closed, it is only necessary to push the handle 5 backward, thereby driving the connecting rod 304 to move backward, and the backward movement of the connecting rod 304 drives the locking sleeve 305 to move backward, so that the teeth 306 in the locking sleeve 305 engage with the gear 1 303. , rotating the handle 5 drives the connecting rod 304 to rotate, and then drives the locking sleeve 305 to rotate, and the teeth 306 can drive the gear 1 303 to rotate, and then drives the rotating shaft 1 302 to rotate, and the power on the rotating shaft 1 302 is transmitted to the valve stem through the worm gear box 2, and then the valve plate is opened and closed. When the rotating shaft 1 302 rotates, it drives the gear 4 404 to rotate, and then drives the gear 3 402 to rotate. The rotation of the gear 3 402 drives the worm 403 to rotate, and then drives the worm wheel 407 to rotate. The rotation of the worm wheel 407 drives the rotating shaft 2 405 to rotate. The rotation of the rotating shaft 2 405 drives the bevel gear 1 9 to rotate, and then drives the bevel gear 2 10 to rotate. The rotation of the bevel gear 2 10 drives the screw rod 11 to rotate, so that the lifting plate 12 moves up or down, and then displays the opening and closing degree of the valve plate.

[0057] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

Claims

1. A flange hard seal butterfly valve, comprising a butterfly valve body (1) and a handle (5), characterized in that: A worm gear box (2) is fixedly mounted on the top of the butterfly valve body (1); the output end of the worm gear box (2) is drivingly connected to the valve stem in the butterfly valve body (1); and a locking mechanism (3) is provided between the input end of the worm gear box (2) and the handle (5); The locking mechanism (3) comprises a housing (301), a rotating shaft (302), a mounting plate (307), and a sliding rod (309); the housing (301) is fixedly mounted on the front side of the worm gear box (2); the rear end of the rotating shaft (302) is drivingly connected to the input end of the worm gear box (2); the front side of the mounting plate (307) is rotatably connected to a locking sleeve (305) via a bearing; the front side of the locking sleeve (305) is fixedly mounted with a connecting rod (304); the front end of the connecting rod (304) is fixedly connected to the back side of the handle (5); the rear end of the sliding rod (309) is fixedly connected to the front side of the worm gear box (2); the mounting plate (307) is slidably mounted on the sliding rod (309); the front end of the sliding rod (309) is provided with an integrally formed convex plate, and the diameter of the convex plate is larger than the diameter of the sliding rod (309); the back side of the mounting plate (307) is fixedly mounted with a spring (308); The rear end of the spring (308) is fixedly connected to the front side of the worm gear box (2); a gear (303) is fixedly mounted on the outer wall of the rotating shaft (302); the locking sleeve (305) covers the outside of the gear (303); teeth (306) are fixedly arranged on the inner side of the locking sleeve (305); the handle (5) is pushed to move backward, thereby driving the connecting rod (304) and the locking sleeve (305) to move backward; the teeth (306) in the locking sleeve (305) are locked. The locking sleeve (305) is meshed with the gear one (303), the teeth (306) are close to the front end of the locking sleeve (305), and the teeth (306) are not provided near the rear end of the locking sleeve (305). On the premise that the handle (5) is not pushed backward, the spring (308) is used to push the mounting plate (307) forward, thereby pushing the locking sleeve (305) forward, so that the teeth (306) in the locking sleeve (305) are separated from the gear one (303); The box body (301) is provided with a display mechanism (4).

2. A flange hard seal butterfly valve according to claim 1, characterized in that: A through hole is provided at the center of the mounting plate (307), and the inner diameter of the through hole is larger than the outer diameter of the gear one (303); the connecting rod (304) is a hollow rod, and the interior of the connecting rod (304) is connected to the interior of the locking sleeve (305); and the outer diameter of the rotating shaft one (302) is smaller than the inner diameter of the connecting rod (304).

3. A flange hard seal butterfly valve according to claim 1, characterized in that: The front end of the connecting rod (304) movably penetrates the front face of the box body (301), and a smooth sleeve (7) is fixedly installed at the position of the box body (301) penetrated by the connecting rod (304), and the smooth sleeve (7) is slidably sleeved on the connecting rod (304).

4. A flange hard seal butterfly valve according to claim 1, characterized in that: Four sliding rods (309) are provided and respectively penetrate the four corners of the mounting plate (307); four springs (308) are provided and correspond one to one with the sliding rods (309).

5. The flange hard seal butterfly valve according to claim 1, characterized in that: The display mechanism (4) comprises a pointer (401) and a gear three (402). The pointer (401) is fixedly mounted on the right side surface of the housing (301). A worm (403) is fixedly mounted on the inner wall of the gear three (402). The rear end of the worm (403) is rotatably connected to the front side of the worm gear housing (2) via a bearing. The gear three (402) is meshed with a gear four (404). The gear four (404) is fixedly mounted on a rotating shaft one (302). The worm (403) is meshed with a worm wheel (407). A rotating shaft two (405) is fixedly mounted on the inner wall of the worm wheel (407). The right end of the rotating shaft two (405) passes through the inner wall of the housing (301) via a bearing. A scale ring (406) is fixedly mounted on the right end of the rotating shaft two (405). The scale ring (406) is located below the pointer (401).

6. A flange hard seal butterfly valve according to claim 5, characterized in that: The gear four (404) is located behind the gear one (303), and the specifications of the gear four (404) are consistent with the specifications of the rotating shaft one (302).

7. A flange hard seal butterfly valve according to claim 5, characterized in that: The worm (403) and the mounting plate (307) are staggered, and a gap is left between the left side surface of the scale ring (406) and the right side surface of the box body (301).

8. The flange hard seal butterfly valve according to claim 1, characterized in that: A grip (6) is fixedly mounted on the outer wall of the handle (5), three grips (6) are provided and distributed in a circular array on the handle (5), and anti-slip patterns are provided on the outer wall of the grip (6).

Images