Leakage-proof pneumatic butterfly valve with multiple sealing structures

Abstract

The utility model relates to the technical field of pneumatic butterfly valves, and discloses a leakproof pneumatic butterfly valve with a multi-sealing structure, which comprises a butterfly valve body, a valve plate for sealing a flow channel is arranged in the butterfly valve body, a valve rod is fixedly inserted in the middle of the valve plate, and one end of the valve rod upwards penetrates through the butterfly valve body; the arc-shaped containing grooves are formed in the outer circle faces of the two sides of the valve plate respectively, inner cavities of the two arc-shaped containing grooves are connected with sealing plates in a sealed and sliding mode respectively, and a pushing assembly used for pushing the two sealing plates outwards is arranged in the valve plate. The two sets of sealing plates are pushed outwards at the same time through the pushing assembly, the sealing plates slide outwards in the arc-shaped containing grooves, contact between the sealing plates and the flow channel is tighter, and the possibility of fluid leakage is effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of pneumatic butterfly valve technology, and in particular to a leak-proof pneumatic butterfly valve with a multi-seal structure. Background Technology

[0002] A pneumatic butterfly valve consists of a pneumatic actuator and a butterfly valve. The pneumatic butterfly valve uses a circular butterfly plate that rotates with the valve stem to open and close, thus realizing the start-up action. It is mainly used as a shut-off valve, but it can also be designed to have regulating or shut-off valve and regulating functions.

[0003] Currently, Chinese patent CN217977414U discloses a pneumatic butterfly valve, including a butterfly valve body. A pneumatic actuator is disposed on the top of the butterfly valve body and connected to a valve stem. Two protective shells are hinged to the outer surface of the butterfly valve body via two pins. Each of the two protective shells has two semi-circular through holes, and the surface of the valve stem contacts the two semi-circular through holes. The protective shells protect the valve stem and the pneumatic actuator, preventing the valve stem from being exposed to the outside for extended periods and bending due to external forces, which could damage the pneumatic actuator.

[0004] The pneumatic butterfly valve mentioned above still has some problems in use. Although it can prevent the valve stem from being exposed to the outside for a long time and bending due to external force, which could damage the pneumatic actuator, the continuous contact between the butterfly plate and the valve body during long-term use can easily lead to wear at the edge of the butterfly plate, resulting in leakage. Utility Model Content

[0005] In order to solve the above-mentioned technical problems, the purpose of this utility model is to provide a leak-proof pneumatic butterfly valve with a multi-seal structure, so as to solve the problem mentioned in the background art that during long-term use, the butterfly plate and the valve body are in constant contact, which can easily lead to wear at the edge of the butterfly plate and cause leakage.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A leak-proof pneumatic butterfly valve with a multi-seal structure includes a butterfly valve body, an internal valve plate for sealing the flow channel, a valve stem fixedly inserted into the middle of the valve plate, one end of the valve stem extending upward through the butterfly valve body; a pneumatic actuator fixedly mounted on the top of the butterfly valve body, the actuating end of the pneumatic actuator being fixedly connected to the top end of the valve stem; and arc-shaped receiving grooves respectively formed on the outer circular surfaces of both sides of the valve plate, with sealing plates slidably connected to the inner cavities of the two sets of arc-shaped receiving grooves, and a pushing assembly for pushing the two sets of sealing plates outward inside the valve plate.

[0008] As a preferred technical solution, the pushing component includes limiting grooves respectively opened on both sides of the valve plate and located on the inner arc surface of the sealing plate. The inner cavities of the two sets of limiting grooves are slidably connected to connecting plates. The upper and lower ends of the two sets of connecting plates are respectively fixedly connected to the upper and lower inner walls of the corresponding side sealing plates. The middle of the opposite side of the two sets of connecting plates is fixedly connected to a second wedge plate. The valve plate has cavities opened on both sides. The inclined surfaces of the two sets of second wedge plates extend into the cavity of the corresponding side and contact the first wedge plate. The two sets of first wedge plates are slidably connected up and down to the cavity of the corresponding side. The surface of the valve plate is provided with a moving member that moves the first wedge plate downward and pushes out the second wedge plate.

[0009] As a preferred technical solution, the moving part includes a square groove formed on the front side of the valve plate and located above the two sets of cavities. The inner cavities of the two sets of square grooves are respectively connected to lead screws, one end of which extends downward and is threaded through the corresponding side second wedge plate.

[0010] As a preferred technical solution, the necks of the two sets of lead screws are respectively fitted with bearings, and the two sets of bearings are respectively inserted into the inner walls of the corresponding side square grooves.

[0011] As a preferred technical solution, the front side of the valve plate and the corresponding positions of the two sets of first wedge plates are respectively threaded with bolts, and the two sets of bolts respectively thread through the surface of the corresponding side valve plate and abut against the surface of the corresponding side first wedge plate.

[0012] As a preferred technical solution, connecting rods are fixedly connected to the upper and lower parts of the two sets of connecting plates on opposite sides. Guide grooves are respectively opened inside the valve plate and at the corresponding positions of each set of connecting rods. One end of the connecting rod is inserted into the inner cavity of the corresponding side guide groove and is fixedly connected to a guide plate. A spring is sleeved on the surface of the connecting rod located inside the guide groove. The two ends of the spring contact the inner wall of the corresponding side guide groove and the surface of the guide plate at the corresponding position, respectively.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] (1) By setting up the push component, when the gate plate is worn, the push component pushes the two sets of sealing plates outward at the same time. The sealing plates slide outward in the arc-shaped receiving groove, making the contact between the sealing plates and the flow channel tighter, thereby improving the sealing effect and effectively reducing the possibility of fluid leakage.

[0015] (2) By setting up the limiting groove and the connecting plate, the cooperation between the limiting groove and the connecting plate ensures the stability and directionality of the sealing plate during the movement. The sealing plate can only slide along the direction defined by the limiting groove, avoiding the offset or shaking of the sealing plate caused by uneven external force or other factors, ensuring uniform contact between the sealing plate and the flow channel, and further improving the reliability and consistency of the sealing effect.

[0016] (3) The present invention provides precise guidance for the movement of the sealing plate by setting the connecting rod and the spring, and the cooperation between the connecting rod and the guide groove, ensuring that the sealing plate always moves in the predetermined direction during the entry and exit process, ensuring accurate fit between the sealing plate and the flow channel, and when the sealing plate moves outward, the spring is compressed and stores elastic potential energy. When the bolt is loosened and the restriction on the first wedge plate is released, the spring releases elastic potential energy, pushes the guide plate and the connecting rod to move inward, and then drives the sealing plate back to the initial position, realizing the automatic reset function of the sealing plate. Attached Figure Description

[0017] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0018] Figure 1 This is a schematic diagram of the structure of a leak-proof pneumatic butterfly valve with a multi-seal structure according to the present invention;

[0019] Figure 2 This is a schematic diagram of the valve plate of this utility model;

[0020] Figure 3 This is a schematic diagram of the square groove of this utility model;

[0021] Figure 4 This is a schematic diagram of the cavity structure of this utility model.

[0022] In the picture:

[0023] 100. Butterfly valve body; 101. Pneumatic actuator; 102. Valve stem; 103. Square groove; 104. Valve plate; 105. Bolt; 106. Sealing plate; 107. Receiving groove; 108. Limiting groove;

[0024] 200, lead screw; 201, bearing; 202, first wedge plate; 203, cavity;

[0025] 300. Connecting plate; 301. Second wedge plate;

[0026] 400. Connecting rod; 401. Spring; 402. Guide plate; 403. Guide groove. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the various embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this utility model to facilitate a better understanding of this application. However, the technical solutions claimed in the claims of this application can be implemented even without these technical details and with various variations and modifications based on the following embodiments.

[0028] Example

[0029] Please see Figures 1-4 This embodiment provides a leak-proof pneumatic butterfly valve with a multi-seal structure, including a butterfly valve body 100. The butterfly valve body 100 has a valve plate 104 inside for sealing the flow channel. A valve stem 102 is fixedly inserted into the middle of the valve plate 104, with one end of the valve stem 102 extending upwards through the butterfly valve body 100. A pneumatic actuator 101 is fixedly installed on the top of the butterfly valve body 100, and the actuating end of the pneumatic actuator 101 is fixedly connected to the top end of the valve stem 102. Arc-shaped receiving grooves 107 are respectively formed on the valve plate 100. On the outer circular surfaces of both sides of 04, the inner cavities of the two sets of arc-shaped receiving grooves 107 are respectively sealed and slidably connected with sealing plates 106. The valve plate 104 is provided with a pushing component for pushing the two sets of sealing plates 106 outward to increase the contact force between the two sets of sealing plates 106 and the flow channel, thereby improving the sealing degree. When the gate plate wears, the pushing component pushes the two sets of sealing plates 106 outward at the same time. The sealing plates 106 slide outward in the arc-shaped receiving grooves 107, making the contact between the sealing plates 106 and the flow channel tighter, thereby improving the sealing effect and effectively reducing the possibility of fluid leakage.

[0030] For details on the specific working principle of the pneumatic actuator 101, please refer to the pneumatic actuator 101 in the magnetically sealed pneumatic butterfly valve with publication number CN212690853U, which will not be elaborated here.

[0031] Furthermore, the actuating component includes limiting grooves 108 respectively formed on both sides of the valve plate 104 and located on the inner arc surface of the sealing plate 106. Connecting plates 300 are slidably connected to the inner cavities of the two sets of limiting grooves 108. The upper and lower ends of the two sets of connecting plates 300 are respectively fixedly connected to the upper and lower inner walls of the corresponding side sealing plates 106. Second wedge plates 301 are fixedly connected to the middle of the opposite side of each of the two sets of connecting plates 300. Cavities 203 are respectively formed inside both sides of the valve plate 104. The inclined surfaces of the two sets of second wedge plates 301 extend into the interior of the corresponding side cavities 203 and contact the first wedge plates 202. The two sets of first wedge plates 202 are slidably connected to the corresponding side cavities 202. Inside the side cavity 203, the surface of the valve plate 104 is provided with a moving member that moves the first wedge plate 202 downward and pushes out the second wedge plate 301. With the first wedge plate 202 in place, the moving member pushes the first wedge plate 202 downward. The inclined surfaces of the first wedge plate 202 and the second wedge plate 301 come into contact with each other. The downward movement of the first wedge plate 202 will push the second wedge plate 301 outward. At the same time, the second wedge plate 301 is connected to the sealing plate 106 through the connecting plate 300, thereby driving the sealing plate 106 to slide outward in the arc-shaped receiving groove 107, making the contact between the sealing plate 106 and the flow channel tighter, thereby improving the sealing effect.

[0032] In the above embodiments, by setting the push component, when the valve plate wears, the position of the sealing plate can be adjusted in time to make its contact with the flow channel tighter, thereby effectively improving the sealing performance of the butterfly valve and reducing the possibility of fluid leakage.

[0033] Furthermore, the movable component includes a square groove 103 formed on the front side of the valve plate 104 and located above the two sets of cavities 203. A lead screw 200 is inserted into the inner cavity of each of the two sets of square grooves 103. One end of the lead screw 200 extends downward and is threaded through the corresponding side second wedge plate 301. By rotating the lead screw 200, the vertical movement distance of the first wedge plate 202 can be precisely controlled, thereby precisely controlling the displacement of the sealing plate 106 and achieving precise adjustment of the sealing degree.

[0034] Preferably, the necks of the two sets of lead screws 200 are respectively fitted with bearings 201, and the two sets of bearings 201 are respectively inserted into the inner wall of the corresponding side square groove 103. By setting the bearings 201, the bearings 201 fitted on the necks of the lead screws 200 effectively reduce the friction force when the lead screws 200 rotate.

[0035] It is worth noting that bolts 105 are threadedly connected to the front side of the valve plate 104 at corresponding positions of the two sets of first wedge plates 202. The two sets of bolts 105 are threaded through the surface of the corresponding valve plate 104 and abut against the surface of the corresponding first wedge plate 202. The bolts 105 ensure that the first wedge plate 202 remains in its set position during butterfly valve operation, preventing displacement due to vibration, fluid impact, or other factors. This improves the sealing reliability of the entire butterfly valve device during long-term operation and reduces the risk of leakage due to unstable sealing. The bolts' fixing function ensures the positional stability of the first wedge plate during butterfly valve operation, preventing displacement due to vibration or other factors, thereby improving the stability and reliability of the seal.

[0036] Furthermore, connecting rods 400 are fixedly connected to the upper and lower parts of opposite sides of the two sets of connecting plates 300. Guide grooves 403 are respectively opened inside the valve plate 104 at corresponding positions of each set of connecting rods 400. One end of each connecting rod 400 is inserted into the inner cavity of the corresponding side guide groove 403 and fixedly connected to a guide plate 402. A spring 401 is sleeved on the surface of the connecting rod 400 located inside the guide groove 403. The two ends of the spring 401 respectively contact the inner wall of the corresponding side guide groove 403 and the surface of the corresponding position guide plate 402. Through the arrangement of the connecting rod 400 and the spring 401, the connecting rod... The cooperation between the guide groove 400 and the guide groove 403 provides precise guidance for the movement of the sealing plate 106, ensuring that the sealing plate 106 always moves in the predetermined direction during its movement in and out, ensuring accurate contact between the sealing plate 106 and the flow channel. When the sealing plate 106 moves outward, the spring 401 is compressed, storing elastic potential energy. When the bolt 105 is loosened, releasing the restriction on the first wedge plate 202, the spring 401 releases its elastic potential energy, pushing the guide plate 402 and the connecting rod 400 inward, thereby driving the sealing plate 106 back to its initial position, realizing the automatic reset function of the sealing plate 106. Through the arrangement of the connecting rod and the spring, when the restriction on the first wedge plate is released, the spring can release its elastic potential energy, pushing the sealing plate back to its initial position, realizing the automatic reset function of the sealing plate and improving operational convenience. The design of the sealing plate allows it to protect the contact surface between the valve plate and the flow channel without affecting fluid flow, thereby reducing valve plate wear and extending the service life of the butterfly valve.

[0037] Working principle;

[0038] When the sealing degree needs to be adjusted, the lead screw 200 is rotated. Since the lead screw 200 and the first wedge plate 202 are connected by a thread, the rotation of the lead screw 200 is converted into the up and down linear motion of the first wedge plate 202. When the lead screw 200 rotates clockwise, the first wedge plate 202 moves downward under the action of the thread, pushing the first wedge plate 202 downward. The inclined surfaces of the first wedge plate 202 and the second wedge plate 301 come into contact with each other. The downward movement of the first wedge plate 202 will push the second wedge plate 301 outward. At the same time, the second wedge plate 301 is connected to the sealing plate 106 through the connecting plate 300, thereby driving the sealing plate 106 to slide outward in the arc-shaped receiving groove 107, making the contact between the sealing plate 106 and the flow channel tighter, thereby improving the sealing effect.

[0039] When the sealing adjustment is completed, tighten the bolt 105 so that the end of the bolt 105 abuts against the surface of the first wedge plate 202, thereby fixing the first wedge plate 202 and preventing it from shifting due to vibration or other factors during the operation of the butterfly valve, thus ensuring the stability and reliability of the sealing.

[0040] Furthermore, when the sealing plate 106 moves outward, the spring 401 is compressed and stores elastic potential energy. When the bolt 105 is loosened and the restriction on the first wedge plate 202 is released, the spring 401 releases its elastic potential energy, pushing the guide plate 402 and the connecting rod 400 to move inward, thereby driving the sealing plate 106 back to its initial position, thus realizing the automatic reset function of the sealing plate 106.

[0041] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A leak-proof pneumatic butterfly valve with a multi-seal structure, characterized in that, include: The butterfly valve body (100) has a valve plate (104) inside for sealing the flow channel. A valve stem (102) is fixedly inserted into the middle of the valve plate (104), and one end of the valve stem (102) passes through the butterfly valve body (100) upward. A pneumatic actuator (101) is fixedly installed on the top of the butterfly valve body (100), and the actuating end of the pneumatic actuator (101) is fixedly connected to the top end of the valve stem (102). Arc-shaped receiving grooves (107) are respectively opened on the outer circular surfaces of the two sides of the valve plate (104). The inner cavities of the two sets of arc-shaped receiving grooves (107) are respectively sealed and slidably connected with sealing plates (106). The valve plate (104) is provided with a pushing component for pushing the two sets of sealing plates (106) outward. The pushing component includes limiting grooves (108) respectively opened on both sides of the valve plate (104) and located on the inner arc surface of the sealing plate (106). The inner cavities of the two sets of limiting grooves (108) are slidably connected to connecting plates (300). The upper and lower ends of the two sets of connecting plates (300) are respectively fixedly connected to the upper and lower inner walls of the corresponding side sealing plate (106). The middle of the opposite side of the two sets of connecting plates (300) is fixedly connected to a second wedge plate (301). The valve plate (104) has cavities (203) respectively opened on both sides. The inclined surfaces of the two sets of second wedge plates (301) extend into the interior of the corresponding side cavity (203) and contact the first wedge plate (202). The two sets of first wedge plates (202) are slidably connected to the interior of the corresponding side cavity (203) respectively. The surface of the valve plate (104) is provided with a moving part that moves the first wedge plate (202) downward and pushes out the second wedge plate (301).

2. The leak-proof pneumatic butterfly valve with a multi-seal structure according to claim 1, characterized in that: The movable component includes a square groove (103) formed on the front side of the valve plate (104) and located above two sets of cavities (203). The inner cavities of the two sets of square grooves (103) are respectively connected to lead screws (200). One end of the lead screw (200) extends downward and is threaded through the corresponding side second wedge plate (301).

3. The leak-proof pneumatic butterfly valve with a multi-seal structure according to claim 2, characterized in that: The necks of the two sets of lead screws (200) are respectively fitted with bearings (201), and the two sets of bearings (201) are respectively inserted into the inner wall of the corresponding side square groove (103).

4. A leak-proof pneumatic butterfly valve with a multi-seal structure according to claim 2, characterized in that: The front side of the valve plate (104) and the corresponding positions of the two sets of first wedge plates (202) are respectively threaded with bolts (105). The two sets of bolts (105) respectively thread through the surface of the corresponding side valve plate (104) and abut against the surface of the corresponding side first wedge plate (202).

5. A leak-proof pneumatic butterfly valve with a multi-seal structure according to claim 2, characterized in that: Two sets of connecting plates (300) are fixedly connected to each other on their upper and lower sides. The valve plate (104) is provided with guide grooves (403) at the corresponding positions of each set of connecting rods (400). One end of the connecting rod (400) is inserted into the inner cavity of the corresponding side guide groove (403) and is fixedly connected to a guide plate (402). A spring (401) is sleeved on the surface of the connecting rod (400) inside the guide groove (403). The two ends of the spring (401) contact the inner wall of the corresponding side guide groove (403) and the surface of the corresponding position guide plate (402).

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