Butterfly valve with double valve rods

Abstract

The utility model discloses a butterfly valve with double valve rods, which relates to the technical field of butterfly valves and comprises a valve body, two ends of the valve body are respectively communicated with a group of connecting mechanisms, each group of connecting mechanisms comprises a group of connecting pipes, the bottom ends of the connecting pipes are communicated with two groups of sleeves, the inner walls of each group of sleeves are respectively sleeved with a group of pistons in a sliding manner, and the pistons are connected with the connecting pipes in a sliding manner. The side wall of each piston is fixedly connected with a damper, the tail ends of the dampers are fixedly connected to the inner wall of the sleeve, the outer wall of each damper is sleeved with a spring, and one end of each spring is fixedly connected to the side wall of the corresponding piston. After the double-valve-rod butterfly valve is closed, liquid rushes into the valve body, the pressure in the valve body is increased, the piston is used for pushing the damper and compressing the spring, and therefore impact force of the liquid is buffered, the situation that the impact force of the liquid on the interior of the valve body is too large, and consequently the interior of the valve body is damaged is avoided, and the service life of the double-valve-rod butterfly valve is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of butterfly valve technology, specifically a double-stem butterfly valve. Background Technology

[0002] As is well known, a butterfly valve, also called a flap valve, is a simple regulating valve that can be used for the on / off control of low-pressure pipeline media. A butterfly valve is a type of valve whose closing element (valve disc or butterfly plate) is a disc that rotates around the valve shaft to achieve opening and closing. The valve can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metals and radioactive media. It mainly plays a role in shut-off and throttling in pipelines. The opening and closing element of a butterfly valve is a disc-shaped butterfly plate that rotates around its own axis in the valve body to achieve the purpose of opening, closing or regulating.

[0003] Existing patent (publication number: CN209818755U) discloses a dual-stem automatic butterfly valve, which improves its adjustment accuracy and allows for continued operation even after the drive device fails, thus enhancing reliability. The valve includes a valve body, a valve disc, and a drive device, with the valve disc rotatably mounted within the valve body. It also includes a housing, a rotating shaft, a limit rod, a hand-cranked screw, a mounting plate, a drive shaft, a first valve stem, a second valve stem, a first ball bearing, a second ball bearing, a gear plate, a third ball bearing, a fourth ball bearing, and a worm gear. The system comprises a first conical wheel, a second conical wheel, a fifth ball bearing, a sixth ball bearing, a seventh ball bearing, a third conical wheel, and a fourth conical wheel. The third conical wheel is located to the left of the second conical wheel and meshes with it. A transverse strip hole is provided on the rear side wall of the housing. The fourth conical wheel is located to the right of the first conical wheel and has a gap between them. Its adjustment accuracy is improved by manual adjustment, and the butterfly valve can still be controlled even if the drive device is damaged, thus improving the reliability of use.

[0004] However, the above technical solutions still have certain defects. After the double stem butterfly valve is closed, the liquid inside the pipeline impacts the valve plate under the action of inertia. As the double stem butterfly valve is used for a long time, the liquid impacts the valve plate multiple times, which eventually leads to internal damage to the double stem butterfly valve, resulting in loss of sealing inside the valve body. Therefore, a double stem butterfly valve is proposed. Utility Model Content

[0005] Therefore, the purpose of this utility model is to provide a double stem butterfly valve to solve the technical problems mentioned in the background.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a double-stem butterfly valve, comprising a valve body, with a set of connecting mechanisms connected to both ends of the valve body, each set of connecting mechanisms comprising a set of connecting pipes, the bottom end of each connecting pipe being connected to two sets of sleeves, a set of pistons slidably fitted on the inner wall of each set of sleeves, a set of dampers fixedly connected to the side wall of each set of pistons, the end of each damper being fixedly connected to the inner wall of the sleeve, and a set of springs fitted on the outer wall of each set of dampers, one end of each spring being fixedly connected to the side wall of the piston, and the other end of each spring being fixedly connected to the inner wall of the sleeve.

[0007] As a preferred technical solution of the dual-stem butterfly valve of this utility model, each end of the connecting pipe is respectively fitted with a set of threaded sleeves, and the inner wall of each set of threaded sleeves is threaded with two sets of pressure blocks.

[0008] As a preferred technical solution of the dual-stem butterfly valve of this utility model, a set of positioning columns is fixedly connected to one side of each group of pressure blocks, and a fixing sleeve is fixedly connected to the other side of the pressure block.

[0009] As a preferred technical solution of the dual-stem butterfly valve of this utility model, a set of fixing plates is respectively provided at the bottom end of each set of connecting pipes. The fixing plate includes a rotating shaft, which is rotatably connected to the bottom end of the connecting pipe.

[0010] As a preferred technical solution of the double stem butterfly valve of this utility model, the bottom end of the rotating shaft is rotatably fitted with a connecting plate, one end of the rotating shaft located inside the connecting plate is fixedly connected with a limiting tooth, and the inner wall of the connecting plate is rotatably connected with two sets of limiting pins.

[0011] As a preferred technical solution of the double stem butterfly valve of this utility model, the end of the limiting pin abuts against the outer wall of the limiting tooth, and a torsion spring is provided at the connection point between the limiting pin and the connecting plate.

[0012] As a preferred technical solution of the double stem butterfly valve of this utility model, the inner wall of the connecting plate is rotatably connected to a lever extending to the outside of the connecting plate. One end of the lever located inside the connecting plate is fixedly connected to two sets of low connectors, and the ends of the two sets of low connectors respectively abut against the side wall of a set of limit pins.

[0013] In summary, the present invention has the following main advantages:

[0014] 1. This utility model utilizes the principle that after the double-stem butterfly valve is closed, liquid rushes into the valve body, increasing the internal pressure. The piston pushes the damper and compresses the spring, thereby buffering the impact force of the liquid and preventing excessive impact force from the liquid on the valve body, which could lead to damage to the valve body and extend the service life of the double-stem butterfly valve.

[0015] 2. This utility model allows the connecting plate to rotate on the outer wall of the shaft by pushing the lever, so that the mounting holes on the connecting plate can match the pre-set mounting hole positions. Then, the double-stem butterfly valve is fixed by bolts. This means that after the pipeline is connected to the upper stem butterfly valve, the connection between the butterfly valve and the pipeline does not need to bear the weight of the butterfly valve itself. Furthermore, the fixed butterfly valve increases the load-bearing capacity of the connection between the pipeline and the butterfly valve, making the connection between the butterfly valve and the pipeline more stable. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0017] Figure 2 This is a bottom view of the structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the exploded structure of this utility model;

[0019] Figure 4 This is a schematic diagram of the cross-sectional structure of the sleeve of this utility model;

[0020] Figure 5 This is a schematic diagram of the internal structure of the connecting plate of this utility model.

[0021] In the diagram: 1. Valve body; 2. Connecting mechanism; 3. Fixing plate;

[0022] 201. Connecting pipe; 202. Sleeve; 203. Piston; 204. Damper; 205. Spring; 206. Threaded sleeve; 207. Pressure block; 208. Positioning pin; 209. Fixing sleeve;

[0023] 301. Rotating shaft; 302. Connecting plate; 303. Limiting tooth; 304. Limiting pin; 305. Lever; 306. Low connector. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0025] The embodiments of this utility model will be described below based on its overall structure.

[0026] A type of double-stem butterfly valve, such as Figures 1 to 5As shown, the device includes a valve body 1, with a set of connecting mechanisms 2 connected to both ends of the valve body 1. Each set of connecting mechanisms 2 includes a set of connecting pipes 201, with two sets of sleeves 202 connected to the bottom end of each connecting pipe 201. A set of pistons 203 is slidably fitted on the inner wall of each set of sleeves 202. A set of dampers 204 is fixedly connected to the side wall of each set of pistons 203. The end of the damper 204 is fixedly connected to the inner wall of the sleeve 202. A set of springs 205 is fitted on the outer wall of each set of dampers 204. One end of the spring 205 is fixedly connected to the side wall of the piston 203, and the other end of the spring 205 is fixedly connected to the inner wall of the sleeve 202. A set of threaded sleeves 206 is fitted at the end of each set of connecting pipes 201. Two sets of pressure blocks 207 are threadedly connected to the inner wall of each set of threaded sleeves 206. A set of positioning pins 208 is fixedly connected to one side of each set of pressure blocks 207, and a fixing sleeve 209 is fixedly connected to the other side of the pressure block 207.

[0027] When the valve body 1 is impacted by liquid, the pressure inside the valve body 1 is transmitted to the surface of the piston 203, causing the piston 203 to slide inside the sleeve 202, thereby compressing the spring 205 and the damper 204, thus buffering the impact force of the liquid on the valve body 1. When it is necessary to connect the valve body 1 to the pipeline, the ends of the pipeline are aligned, and then two sets of pressure blocks 207 are fitted onto the outer wall of the pipeline, so that the fixing post on each set of pressure blocks 207 is inserted into the fixing sleeve 209 on the other set of pressure blocks 207. Then, the two sets of pressure blocks 207 are rotated, so that the two sets of pressure blocks 207 are threadedly connected to the inner wall of the threaded sleeve 206 under the action of the thread. At this time, the two sets of pressure blocks 207 are wrapped by the threaded sleeve 206 and cannot be separated. Under the action of the thread, the pressure blocks 207 tightly press the end of the pipeline onto the end of the connecting pipe 201.

[0028] Please refer to this carefully. Figure 2 and Figure 5 Each set of connecting pipes 201 has a set of fixing plates 3 at its bottom end. The fixing plate 3 includes a rotating shaft 301, which is rotatably connected to the bottom end of the connecting pipe 201. The bottom end of the rotating shaft 301 is rotatably fitted with a connecting plate 302. One end of the rotating shaft 301 located inside the connecting plate 302 is fixedly connected to a limiting tooth 303. Two sets of limiting pins 304 are rotatably connected to the inner wall of the connecting plate 302. The ends of the limiting pins 304 abut against the outer wall of the limiting tooth 303. A torsion spring is provided at the connection point between the limiting pins 304 and the connecting plate 302. A lever 305 extending to the outside of the connecting plate 302 is rotatably connected to the inner wall of the connecting plate 302. Two sets of low connectors 306 are fixedly connected to one end of the lever 305 located inside the connecting plate 302. The ends of the two sets of low connectors 306 abut against the side wall of one set of limiting pins 304 respectively.

[0029] By rotating the lever 305, the abutment is rotated. During this rotation, the abutment pushes a set of limiting pins 304 away from the limiting teeth 303. At this time, the connecting plate 302 can rotate in the direction of this set of limiting pins 304, allowing the other set of limiting pins 304 to slide on the surface of the limiting teeth 303. However, if the connecting plate 302 rotates to the other side, the other set of limiting pins 304 will be blocked by the limiting teeth 303, preventing the connecting plate 302 from rotating to the other side. Releasing the lever 305... Then, the torsion spring drives the limit pin 304 to reset, causing the limit pin 304 to push the abutment to reset, thereby causing the abutment to drive the lever 305 to reset. If the lever 305 is rotated in the opposite direction, the same principle applies. At this time, the rotatable direction of the connecting plate 302 is opposite to the above process. When the two sets of limit pins 304 abut against the outer wall of the limit tooth 303 at the same time, the connecting plate 302 cannot rotate. By adjusting the angle of the connecting plate 302 through the above principle, the hole on the connecting plate 302 can be aligned with the pre-set mounting hole.

[0030] In use, after the double-stem butterfly valve is closed, liquid rushes into the valve body 1, increasing the internal pressure of the valve body 1. The piston 203 pushes the damper 204 and compresses the spring 205, thereby buffering the impact force of the liquid and preventing excessive impact force on the valve body 1, which could cause damage to the valve body 1 and extend the service life of the double-stem butterfly valve. The parts not mentioned in this device are the same as or can be implemented using existing technology.

[0031] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A double stem butterfly valve comprising a valve body (1), characterized in that: Two ends of the valve body (1) are respectively communicated with a set of connecting mechanisms (2), each set of the connecting mechanisms (2) comprises a set of connecting pipes (201), the bottom end of the connecting pipe (201) is communicated with two sets of sleeve pipes (202), the inner wall of each set of the sleeve pipes (202) is respectively sleeved with a set of pistons (203), the side wall of each set of the pistons (203) is respectively fixedly connected with a set of dampers (204), the tail end of the damper (204) is fixedly connected with the inner wall of the sleeve pipe (202), the outer wall of each set of the dampers (204) is respectively sleeved with a set of springs (205), one end of the spring (205) is fixedly connected with the side wall of the piston (203), the other end of the spring (205) is fixedly connected with the inner wall of the sleeve pipe (202).

2. A dual stem butterfly valve according to claim 1, wherein: The end of each set of the connecting pipes (201) is respectively sleeved with a set of threaded sleeves (206), the inner wall of each set of the threaded sleeves (206) is threadedly connected with two sets of pressing blocks (207).

3. A dual stem butterfly valve according to claim 2, wherein: One side of each set of the pressing blocks (207) is respectively fixedly connected with a set of positioning columns (208), the other side of the pressing block (207) is fixedly connected with a fixed sleeve (209).

4. The dual stem butterfly valve of claim 1, wherein: The bottom end of each set of the connecting pipes (201) is respectively provided with a set of fixed plates (3), the fixed plate (3) comprises a rotating shaft (301), the rotating shaft (301) is rotatably connected with the bottom end of the connecting pipe (201).

5. A dual stem butterfly valve according to claim 4, wherein: The bottom end of the rotating shaft (301) is rotatably sleeved with a connecting plate (302), one end of the rotating shaft (301) located in the inside of the connecting plate (302) is fixedly connected with a limiting tooth (303), the inner wall of the connecting plate (302) is rotatably connected with two sets of limiting pins (304).

6. A dual stem butterfly valve according to claim 5, wherein: The tail end of the limiting pin (304) abuts against the outer wall of the limiting tooth (303), the limiting pin (304) is provided with a torsional spring at the connecting position with the connecting plate (302).

7. A dual stem butterfly valve according to claim 5, wherein: The inner wall of the connecting plate (302) is rotatably connected with a pushing rod (305) extending to the outside of the connecting plate (302), one end of the pushing rod (305) located in the inside of the connecting plate (302) is fixedly connected with two sets of abutting heads (306), the tail end of the two sets of the abutting heads (306) respectively abuts against the side wall of a set of the limiting pins (304).

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