Pneumatic corrugated pipe stop valve

Abstract

The invention relates to a pneumatic corrugated pipe stop valve, and relates to the technical field of stop valves, the pneumatic corrugated pipe stop valve comprises a valve body, a valve cover installed on the valve body, a valve clack located in the valve body and a valve rod driving the valve clack to slide, an air cylinder is fixedly arranged above the valve cover, and a piston is arranged in the air cylinder in a sliding mode; the side face, away from the valve deck, of the air cylinder is provided with an installation opening allowing the piston to be placed in, and a cover plate for blocking the installation opening is fixedly arranged outside the air cylinder. An upper air inlet and a lower air inlet for a compressed air pipeline to be connected in are formed in the periphery of the air cylinder, a push rod is fixedly arranged on the side face, facing the valve cover, of the piston, a mounting hole for the push rod to penetrate through is formed in the air cylinder, and the outer end of the push rod is coaxially and fixedly connected with the outer end of the valve rod; a first sealing ring is embedded in the inner wall of the mounting hole, a second sealing ring is embedded in the periphery of the piston, and a third sealing ring is embedded in the side face, facing the cover plate, of the air cylinder. The sealing performance and the stability of the pneumatic corrugated pipe stop valve are remarkably improved.

Description

Technical Field

[0001] This application relates to the technical field of globe valves, and in particular to a pneumatic bellows globe valve. Background Art

[0002] A bellows globe valve with a pneumatic actuator, simply referred to as a pneumatic bellows globe valve, is a valve that uses compressed air as a power source and drives the valve stem and valve core to move up and down through the pneumatic actuator to control the flow of fluid. Due to its unique bellows seal design and excellent performance, this valve plays an important role in the fluid control system.

[0003] In the related art, a bellows globe valve with a pneumatic actuator mainly consists of key structures such as a valve body, a bellows seal assembly (including a bellows and packing), a valve cover, a valve stem, a valve core, and a pneumatic actuator (including components such as a cylinder and a piston). These components work together to achieve the on-off control of the valve and the sealing and truncation of the medium.

[0004] In practical applications, in an environment with frequent vibrations, the cylinder and piston in the pneumatic actuator of a pneumatic bellows globe valve may leak air. This problem not only affects the opening and closing speed and accuracy of the valve but may also seriously affect the sealing performance of the valve, and even cause the valve to fail, leaving room for improvement. Summary of the Invention

[0005] The purpose of this application is to provide a pneumatic bellows globe valve to solve the problem that when the pneumatic bellows globe valve is applied in a frequently vibrating scenario, air leakage easily occurs at the cylinder and piston, thereby affecting the service performance of the globe valve.

[0006] A pneumatic bellows globe valve provided by this application adopts the following technical solution: A pneumatic bellows globe valve includes a valve body, a valve cover installed on the valve body, a valve flap located inside the valve body, and a valve stem that drives the valve flap to slide. A cylinder is fixedly provided above the valve cover. A piston is slidably provided inside the cylinder. An installation port for the piston to be inserted is opened on the side of the cylinder away from the valve cover. A cover plate that seals the installation port is fixedly provided outside the cylinder. An upper air inlet and a lower air inlet for connecting a compressed gas pipeline are opened on the outer circumference of the cylinder. A push rod is fixedly provided on the side of the piston facing the valve cover. An installation hole for the push rod to pass through is opened on the cylinder. The outer end of the push rod is coaxially fixedly connected to the outer end of the valve stem. A first sealing ring is embedded on the inner wall of the installation hole. A second sealing ring is embedded on the outer circumference of the piston. A third sealing ring is embedded on the side of the cylinder facing the cover plate. The inner side surface of the first sealing ring fits with the outer circumferential surface of the push rod. The outer circumferential surface of the second sealing ring fits with the inner wall of the cylinder. The side of the third sealing ring away from the cylinder fits with the inner side surface of the cover plate.

[0007] By adopting the above technical solution, the first sealing ring ensures a tight fit between the push rod and the cylinder mounting port, preventing gas leakage from this location; the second sealing ring ensures the sealing performance when the piston slides in the cylinder, avoiding gas leakage between the piston and the inner wall of the cylinder; the third sealing ring further enhances the sealing effect between the cylinder and the cover plate. The coordinated action of multiple sealing rings significantly improves the sealing performance and stability of the pneumatic bellows globe valve, ensures the opening and closing speed and accuracy of the valve, extends the service life of the valve, and thus improves the overall performance and reliability of the fluid control system.

[0008] Optionally, a first communication cavity for the valve stem to be inserted and penetrate is provided on the valve cover, and a first communication port communicating with the first communication cavity is provided on the valve body; a bellows capable of stretching is sleeved on the outer periphery of the valve stem, and the end edge of the bellows close to the valve body is fixedly connected to the opening edge of the first communication port, and the end edge of the bellows away from the valve body is fixedly connected to the outer peripheral surface of the valve stem.

[0009] By adopting the above technical solution, both ends of the bellows are fixedly connected to the first communication port of the valve body and the outer peripheral surface of the valve stem respectively. This stable connection method further enhances the sealing effect. In addition, the bellows also has certain elasticity and compensation ability, which can absorb and relieve the small displacements and stresses generated by the valve stem under frequent operation or vibration environment, thereby protecting the sealing structure between the valve stem and the valve body and extending the service life of the valve.

[0010] Optionally, a support plate is fixedly provided on the outer periphery of the valve cover, and a plurality of support rods are fixedly provided on the side surface of the support plate away from the valve body. The ends of the plurality of support rods away from the support plate are all fixedly connected to the bottom side of the cylinder.

[0011] By adopting the above technical solution, the support plate fixedly provided on the outer periphery of the valve cover and the plurality of support rods connected to the support plate provide a stable support structure for the cylinder. This design effectively enhances the stability and rigidity of the cylinder, reduces the shaking and displacement of the cylinder under a frequent vibration environment, and thus further guarantees the sealing performance between the cylinder and the piston. At the same time, the stable support structure also helps to improve the overall stability and durability of the pneumatic bellows globe valve, ensuring that the valve can maintain good opening and closing performance and sealing effect under various working conditions.

[0012] Optionally, two extension blocks are fixedly provided opposite to each other on the outer periphery of the support plate, and a protective plate is hinged on the side surface of the two extension blocks away from the support plate. The protective plate can be rotated upward to a state parallel to the axis of the cylinder, and a locking member for locking the two protective plates on the outer side surface of the cylinder is provided on the cover plate.

[0013] By adopting the above technical solution, the protection plates hinged on the two extension blocks provide additional support for the cylinder. The protection plates can be rotated upward to a state parallel to the axis of the cylinder, so that they can be conveniently installed on the outside of the cylinder when not in use or under maintenance, strengthening the assembly stability of the cylinder and the valve cover.

[0014] Optionally, a locking convex plate is vertically fixed on the side edge of the protection plate away from the extension block. The locking convex plate can be rotated with the protection plate to a state parallel to the upper side of the cover plate. Locking notches are formed on the side surfaces of the two locking convex plates close to each other; the locking member is a locking rod rotatably arranged in the middle of the cover plate. The rotation plane of the locking rod is parallel to the side surface of the cover plate away from the cylinder, and the two ends of the locking rod can be respectively rotatably clamped into the locking notches on the two locking rods.

[0015] By adopting the above technical solution, when the protection plate is rotated to a state parallel to the axis of the cylinder, the locking convex plate is also rotated to a position parallel to the upper side of the cover plate. At this time, the locking rod can be conveniently rotated and clamped into the locking notches on the two locking convex plates, so as to firmly lock the protection plate on the outside of the cylinder. This locking method is simple and easy to operate, and the locking effect is reliable, which can effectively prevent the protection plate from loosening or falling off inadvertently. At the same time, the middle of the locking rod is rotatably arranged on the cover plate, making the locking operation more flexible and capable of adapting to the locking requirements at different angles and positions.

[0016] Optionally, a traction handle is fixed on the outer circumference of the locking rod away from the cover plate.

[0017] By adopting the above technical solution, fixing a traction handle on the outer circumference of the locking rod provides a direct and intuitive operation method for the operator. The operator can easily rotate the locking rod by holding the traction handle, so as to lock or unlock the protection plate. This design not only simplifies the operation process, but also improves the operation accuracy and efficiency.

[0018] Optionally, a guiding through hole for the locking convex plate to penetrate and slide is formed on the protection plate, and a fastener for fixing the sliding state of the locking convex plate is arranged on the protection plate; the protection plate can be rotated toward the valve body to a state parallel to the axis of the cylinder. The two locking convex plates can slide toward each other to an abutting state and be fixed by the fastener in this state of the protection plate, and a fixing member for fixing the two locking convex plates in the abutting state to each other is arranged outside the valve body.

[0019] By adopting the above technical solution, when the protective plate rotates downward to a state parallel to the axis of the cylinder, the two locking convex plates can slide towards each other until they abut, and are fixed by fasteners. This design enables the combined structure of the protective plate and the locking convex plate to jointly protect the valve body, enhancing the overall stability. When the globe valve is packaged and transported, this is used to reduce the possibility of damage to the valve body and the internal valve flap due to collision.

[0020] Optionally, a fastening through-hole communicating with the guiding through-hole is provided on the protective plate, and a number of fastening screw holes capable of coinciding with the fastening through-hole are provided on the locking convex plate. The fastener is a fastening bolt capable of passing through the fastening through-hole and then screwing into the fastening screw hole.

[0021] By adopting the above technical solution, the combination of the fastening through-hole on the protective plate and the fastening screw hole on the locking convex plate provides an accurate and stable positioning point for the installation of the fastener. As a fastener, the fastening bolt can conveniently pass through the fastening through-hole and then screw into the fastening screw hole to fix the sliding state of the locking convex plate. This design not only simplifies the installation process and improves work efficiency, but also ensures the stability and reliability of the locking convex plate on the protective plate.

[0022] Optionally, the protective plate can rotate towards the valve body to a state perpendicular to the axis of the valve stem, a positioning member for fixing the protective plate in this state is provided on the support plate, and one side of the locking convex plate can be adjusted to be flush with the bottom side of the valve body when the protective plate is in this state.

[0023] By adopting the above technical solution, when installing the globe valve, the protective plate is adjusted to a state perpendicular to the axis of the valve stem, and the locking convex plate is adjusted to a state where the lower end surface is flush with the bottom surface of the valve body, so as to use the locking convex plate to assist in supporting the valve body and reduce the possibility of the valve body tipping over during the installation process.

[0024] Optionally, the positioning member includes a positioning rod rotatably provided on the side of the extension block away from the valve body, and the rotating surface of the positioning rod is flush with the side of the extension block away from the valve body; when the protective plate rotates to a state perpendicular to the valve stem, the positioning rod can rotate to the side of the protective plate facing the cylinder.

[0025] By adopting the above technical solution, during installation, the protective plate can be adjusted to a state perpendicular to the axis of the valve stem, and the locking convex plate is used to provide additional support for the valve body, effectively reducing the risk of the valve body tipping over during the installation process. At the same time, the design of the positioning rod makes the fixation of the protective plate simple and fast. The operator only needs to rotate the positioning rod to the side of the protective plate facing the cylinder to achieve a stable fixation effect. This design not only improves the installation efficiency, but also ensures the safety and stability during the installation process, providing a strong guarantee for the wide application of the pneumatic bellows globe valve.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. The first sealing ring ensures a tight fit between the push rod and the cylinder mounting port, preventing gas leakage from this location; the second sealing ring ensures the sealing performance when the piston slides in the cylinder, avoiding gas leakage between the piston and the inner wall of the cylinder; the third sealing ring further enhances the sealing effect between the cylinder and the cover plate. The synergistic effect of multiple sealing rings significantly improves the sealing performance and stability of the pneumatic bellows globe valve.

[0027] 2. Both ends of the bellows are fixedly connected to the first communication port of the valve body and the outer peripheral surface of the valve stem respectively. This stable connection method further enhances the sealing effect. In addition, the bellows also has certain elasticity and compensation ability, which can absorb and relieve the small displacements and stresses generated by the valve stem under frequent operation or vibration environments, thereby protecting the sealing structure between the valve stem and the valve body and extending the service life of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0029] Figure 1 is the overall structural schematic diagram of Embodiment 1 of the present application; Figure 2 is the cross-sectional structural schematic diagram showing the installation and cooperation of the bellows in Embodiment 1 of the present application; Figure 3 is the partial cross-sectional structural schematic diagram showing the installation and cooperation of the piston in Embodiment 1 of the present application; Figure 4 is the overall structural schematic diagram of Embodiment 2 of the present application; Figure 5 is the cross-sectional structural schematic diagram showing the installation and cooperation of the locking member in Embodiment 2 of the present application; Figure 6 is the structural schematic diagram showing the protective plate rotated downward to the vertical state in Embodiment 2 of the present application; Figure 7 is the partial cross-sectional structural schematic diagram showing the protective plate rotated downward to the vertical state in Embodiment 2 of the present application; Figure 8 is Figure 7 the partial enlarged view of Part A in Figure 9 is the structural schematic diagram showing the protective plate rotated to the horizontal state in Embodiment 2 of the present application.

[0030] In the figure, 1 is the valve body; 11 is the flow channel; 12 is the first communication port; 2 is the valve cover; 21 is the first communication cavity; 22 is the support plate; 221 is the extension block; 23 is the support rod; 3 is the valve stem; 31 is the valve flap; 32 is the bellows; 4 is the actuator assembly; 41 is the cylinder; 411 is the mounting port; 412 is the upper air inlet; 413 is the lower air inlet; 414 is the mounting hole; 42 is the cover plate; 43 is the piston; 44 is the push rod; 45 is the first sealing ring; 46 is the second sealing ring; 47 is the third sealing ring; 5 is the protection plate; 51 is the guiding through hole; 52 is the fastening through hole; 53 is the fastener; 531 is the fastening bolt; 6 is the locking member; 61 is the locking rod; 62 is the traction handle; 7 is the locking convex plate; 71 is the locking notch; 72 is the fastening screw hole; 8 is the fixing member; 81 is the first magnetic attraction block; 82 is the second magnetic attraction block; 9 is the positioning member; 91 is the positioning rod. Detailed implementation mode

[0031] The following further elaborates on this application in conjunction with all the attached drawings.

[0032] Embodiment 1: Referring to Figure 1 and Figure 2 , a pneumatic bellows globe valve includes a valve body 1, a valve cover 2 fixed to the valve body 1 by screws, a valve flap 31 located inside the valve body 1, and a valve stem 3 driving the valve flap 31 to slide. A flow channel 11 is formed inside the valve body 1. An actuator assembly 4 is provided above the valve cover 2, and the outer end of the valve stem 3 is connected to the actuator assembly 4. A first communication cavity 21 for the valve stem 3 to be inserted and penetrate is opened on the valve cover 2, and a first communication port 12 communicating with the first communication cavity 21 is opened on the valve body 1. A bellows 32 capable of stretching is sleeved on the outer periphery of the valve stem 3. The edge of the end of the bellows 32 close to the valve body 1 is fixedly connected to the opening edge of the first communication port 12, and the edge of the end of the bellows 32 far from the valve body 1 is fixedly connected to the outer peripheral surface of the valve stem 3. When this globe valve is applied, the actuator assembly 4 drives the valve stem 3 to reciprocally slide along its own axis, thereby controlling the valve plate to block or close the flow channel 11.

[0033] Referring to Figure 2 , the actuator assembly 4 includes a cylinder 41 fixedly installed above the valve cover 2 and a piston 43 sliding inside the cylinder 41. An installation port 411 for the piston 43 to be inserted is opened on the side of the cylinder 41 far from the valve cover 2, and a cover plate 42 blocking the installation port 411 is provided outside the cylinder 41. An upper air inlet 412 and a lower air inlet 413 for connecting a compressed gas pipeline are opened on the outer periphery of the cylinder 41. A push rod 44 is fixedly provided on the side of the piston 43 facing the valve cover 2. An installation hole 414 for the push rod 44 to penetrate is opened on the cylinder 41, and the outer end of the push rod 44 is coaxially and fixedly connected to the outer end of the valve stem 3.

[0034] Reference Figure 3 On the inner wall of the mounting hole 414, a first sealing ring 45 is embedded. On the outer periphery of the piston 43, a second sealing ring 46 is embedded. On the side surface of the cylinder 41 facing the cover plate 42, a third sealing ring 47 is embedded. The first sealing ring 45, the second sealing ring 46, and the third sealing ring 47 are all made of rubber material; The inner side surface of the first sealing ring 45 fits with the outer peripheral surface of the push rod 44. The outer peripheral surface of the second sealing ring 46 fits with the inner wall of the cylinder 41. The side surface of the third sealing ring 47 away from the cylinder 41 fits with the inner side surface of the cover plate 42.

[0035] Reference Figure 1 and Figure 2 On the outer periphery of the valve cover 2, a support plate 22 is fixedly provided. On the side surface of the support plate 22 away from the valve body 1, three support rods 23 are fixedly provided at equal intervals in the vertical direction. The ends of the three support rods 23 away from the support plate 22 are fixedly connected to the bottom side of the cylinder 41, thereby realizing the installation and fixation of the cylinder 41.

[0036] The implementation principle of the embodiment of the present application is as follows: The pneumatic bellows 32 stop valve uses the cylinder 41 as the actuator 4, drives the valve stem 3 to drive the valve flap 31 to slide in the valve body 1, thereby controlling the opening and closing of the flow channel 11. The bellows 32 sleeved on the outer periphery of the valve stem 3 is fixedly connected to the valve body 1 and the valve stem 3 at both ends, ensuring the effective isolation of the valve stem 3 from the external environment during the sliding process and preventing the leakage of the medium. The reciprocating movement of the piston 43 inside the cylinder 41 is transmitted to the valve stem 3 through the push rod 44 to realize the precise control of the valve flap 31. The cylinder 41 is stably connected to the valve cover 2 through the support plate 22 and the support rods 23, ensuring the stable operation of the actuator 4. At the same time, multiple rubber sealing rings provided around the cylinder 41 and the piston 43 effectively prevent the leakage of compressed gas and ensure the reliability of the pneumatic system.

[0037] Embodiment 2: Reference Figure 4 and Figure 5 The difference between the embodiment of the present application and Embodiment 1 is that two symmetrical extension blocks 221 are integrally formed on the outer periphery of the support plate 22. On the side surfaces of the two extension blocks 221 away from the support plate 22, a protection plate 5 is hinged. The protection plate 5 can be rotated upward to a state parallel to the axis of the cylinder 41. A locking member 6 for locking the two protection plates 5 on the outer side surface of the cylinder 41 is provided on the cover plate 42; The locking member 6 is a locking rod 61 rotatably arranged in the middle on the cover plate 42. The rotation plane of the locking rod 61 is parallel to the side of the cover plate 42 away from the cylinder 41. A traction handle 62 is fixedly arranged on the outer periphery of the locking rod 61 away from the cover plate 42; on the side edge of the protective plate 5 away from the extension block 221, a locking convex plate 7 is vertically fixedly arranged. The locking convex plate 7 can rotate with the protective plate 5 to a state parallel to the upper side of the cover plate 42. Locking notches 71 are formed on the mutually approaching sides of the two locking convex plates 7; When the two protective plates 5 rotate towards the cylinder 41 to a state parallel to the axis of the valve stem 3, the locking rod 61 is rotated through the traction handle 62, so that both ends of the locking rod 61 are respectively caught in the locking notches 71 on the two locking rods 61, thereby locking the protective plate 5 and the locking convex plate 7 in this state and enhancing the assembly stability of the valve cover 2 and the cylinder 41.

[0038] Refer to Figure 5 , a guiding through hole 51 for the locking convex plate 7 to penetrate and slide is formed on the protective plate 5. A fastening member 53 for fixing the sliding state of the locking convex plate 7 is arranged on the protective plate 5. The fastening member 53 is a fastening bolt 531, and the style of the fastening bolt 531 is a butterfly bolt; A fastening through hole 52 communicating with the guiding through hole 51 is formed on the protective plate 5. A plurality of fastening screw holes 72 capable of coinciding with the fastening through hole 52 are uniformly formed on the locking convex plate 7. When the locking convex plate 7 is adjusted to a certain state, the fastening through hole 52 coincides with the corresponding fastening screw hole 72, and then the fastening bolt 531 is passed through the fastening through hole 52 and screwed into the corresponding fastening screw hole 72.

[0039] Refer to Figure 6 , Figure 7 and Figure 8 , a fixing member 8 is arranged outside the valve body 1. The fixing member 8 includes a first magnetic attraction block 81 and a second magnetic attraction block 82. The first magnetic attraction block 81 is embedded in one of the locking convex plates 7, and the second magnetic attraction block 82 is embedded in the other locking convex plate 7; When the stop valve is packaged and transported, the protective plate 5 can rotate towards the valve body 1 to a state parallel to the axis of the cylinder 41. Then, the two locking convex plates 7 can slide towards each other to an abutting state in this state of the protective plate 5, and then the locking convex plates 7 in this state are fixed by the fastening bolt 531; when the two locking rods 61 are in an abutting state in this state, the first magnetic attraction block 81 abuts against the second magnetic attraction block 82 and attracts each other; the outside of the valve body 1 is protected by the protective plate 5 and the locking convex plate 7 in this state, reducing the possibility of damage to the valve body 1 and the internal valve flap 31 due to collision.

[0040] Refer to Figure 9, the protective plate 5 can rotate towards the valve body 1 to a state perpendicular to the axis of the valve stem 3, and a positioning member 9 for fixing the protective plate 5 in this state is provided on the support plate 22; the positioning member 9 includes two positioning rods 91 rotatably arranged on the sides of the two extension blocks 221 away from the valve body 1, and the rotation surface of the positioning rod 91 is flush with the side of the extension block 221 away from the valve body 1; When the protective plate 5 rotates to a state perpendicular to the valve stem 3, the positioning rod 91 can rotate to the side of the protective plate 5 facing the cylinder 41, so as to limit the protective plate 5 in this state; then the staff can adjust the state of the locking convex plate 7 to make the lower side of the locking convex plate 7 flush with the bottom side of the valve body 1 in this state; when installing this stop valve, adjust the protective plate 5 and the locking convex plate 7 to the above state, and use the locking convex plate 7 to assist in supporting the valve body 1 to reduce the possibility of the valve body 1 tipping over.

[0041] The implementation principle of the embodiment of this application is as follows: When the stop valve is applied, rotate the two protective plates 5 towards the cylinder 41 to a state parallel to the axis of the valve stem 3, and rotate the locking rod 61 through the traction handle 62 so that the two ends of the locking rod 61 are respectively caught in the locking notches 71 on the two locking rods 61, thereby locking the protective plate 5 and the locking convex plate 7 in this state and enhancing the assembly stability of the valve cover 2 and the cylinder 41; During packaging and transportation, in order to reduce the risk of damage to the valve body 1 and the internal valve flap 31 due to collision, the protective plate 5 can rotate towards the valve body 1 to a state parallel to the axis of the cylinder 41, and slide the two locking convex plates 7 towards each other until they abut; at this time, the first magnetic attraction block 81 and the second magnetic attraction block 82 (respectively embedded in the two locking convex plates 7) will attract and abut against each other, further enhancing the protection effect; During the installation process, the protective plate 5 can also rotate towards the valve body 1 to a state perpendicular to the axis of the valve stem 3 and be fixed by the positioning member 9 (i.e., the positioning rod 91 rotatably arranged on the extension block 221). In this state, the lower side of the locking convex plate 7 can be flush with the bottom side of the valve body 1 to serve as an auxiliary support and reduce the possibility of the valve body 1 tipping over during the installation process.

[0042] Unless otherwise defined, the terms or scientific terms used in this application shall have the ordinary meanings as understood by those of ordinary skill in the art to which this application pertains. The words "first", "second", "third" and similar words used in the text of this application do not denote any order, quantity or importance, but are only used to distinguish different components. Words such as "a" or "an" do not denote a quantity limitation either, but indicate the existence of at least one. Words such as "comprising" or "including" mean that the elements or objects appearing before "comprising" or "including" cover the elements or objects listed after "comprising" or "including" and their equivalents, and do not exclude other elements or objects. "Upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationships may also change accordingly.

[0043] The embodiments of this specific implementation manner are all preferred embodiments of this application, and do not limit the protection scope of this application accordingly. The same components are denoted by the same reference numerals. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. A pneumatic bellows stop valve, comprising a valve body (1), a valve cover (2) mounted on the valve body (1), a valve flap (31) located inside the valve body (1), and a valve stem (3) for driving the valve flap (31) to slide, wherein a cylinder (41) is fixedly arranged above the valve cover (2), a piston (43) is slidably arranged inside the cylinder (41), a mounting opening (411) for inserting the piston (43) is provided on a side of the cylinder (41) away from the valve cover (2), and a cover plate (42) for blocking the mounting opening (411) is fixedly arranged outside the cylinder (41); An upper air inlet (412) and a lower air inlet (413) for accessing a compressed gas pipeline are provided on the outer periphery of the cylinder (41); a push rod (44) is fixedly provided on the side of the piston (43) facing the valve cover (2); a mounting hole (414) for the push rod (44) to pass through is provided on the cylinder (41); and the outer end of the push rod (44) is coaxially fixedly connected to the outer end of the valve stem (3); It is characterized in that A first sealing ring (45) is embedded on the inner wall of the mounting hole (414), a second sealing ring (46) is embedded on the outer periphery of the piston (43), and a third sealing ring (47) is embedded on the side of the cylinder (41) facing the cover plate (42); the inner side of the first sealing ring (45) is in contact with the outer peripheral surface of the push rod (44), the outer peripheral surface of the second sealing ring (46) is in contact with the inner wall of the cylinder (41), and the side of the third sealing ring (47) away from the cylinder (41) is in contact with the inner side of the cover plate (42).

2. A pneumatic bellows stop valve according to claim 1, characterized in that: The valve cover (2) is provided with a first communication cavity (21) for the valve stem (3) to be placed in and pass through, and the valve body (1) is provided with a first communication port (12) which is in communication with the first communication cavity (21); An extendable bellows (32) is sleeved on the outer periphery of the valve stem (3); the end edge of the bellows (32) close to the valve body (1) is fixedly connected to the opening edge of the first connecting port (12); and the end edge of the bellows (32) away from the valve body (1) is fixedly connected to the outer peripheral surface of the valve stem (3).

3. A pneumatic bellows stop valve according to claim 1, characterized in that: A support plate (22) is fixedly provided on the outer periphery of the valve cover (2), and a plurality of support rods (23) are fixedly provided on the side of the support plate (22) away from the valve body (1), and the ends of the plurality of support rods (23) away from the support plate (22) are fixedly connected to the bottom side of the cylinder (41).

4. A pneumatic bellows stop valve according to claim 3, characterized in that: Two extension blocks (221) are relatively fixedly arranged on the outer periphery of the support plate (22); protective plates (5) are hingedly connected on the sides of the two extension blocks (221) away from the support plate (22); the protective plates (5) can be rotated upward to a state parallel to the axis of the cylinder (41); and a locking member (6) is provided on the cover plate (42) for locking the two protective plates (5) on the outer side of the cylinder (41).

5. A pneumatic bellows stop valve according to claim 4, characterized in that: A locking convex plate (7) is vertically fixedly provided on the side edge of the protective plate (5) away from the extension block (221); the locking convex plate (7) can rotate with the protective plate (5) to a state parallel to the upper side of the cover plate (42); and locking notches (71) are provided on the sides of the two locking convex plates (7) close to each other; The locking member (6) is a locking rod (61) whose middle portion is rotatably arranged on the cover plate (42); a rotating surface of the locking rod (61) is parallel to a side surface of the cover plate (42) away from the cylinder (41); and two ends of the locking rod (61) can be rotatably inserted into locking notches (71) on the two locking rods (61), respectively.

6. A pneumatic bellows stop valve according to claim 5, characterized in that: A traction handle (62) is fixedly provided on the outer periphery of the locking rod (61) away from the cover plate (42).

7. A pneumatic bellows stop valve according to claim 5, characterized in that: The protective plate (5) is provided with a guide through hole (51) for the locking convex plate (7) to pass through and slide, and the protective plate (5) is provided with a fastener (53) for fixing the locking convex plate (7) in a sliding state; The protective plate (5) can be rotated in a direction close to the valve body (1) to a state parallel to the axis of the cylinder (41), and the two locking convex plates (7) can slide towards each other to abut against each other in this state of the protective plate (5) and be fixed by a fastener (53), and a fixing member (8) is provided outside the valve body (1) for fixing the two locking convex plates (7) in the abutting state to each other.

8. A pneumatic bellows stop valve according to claim 7, characterized in that: The protective plate (5) is provided with a fastening through hole (52) which is in communication with the guide through hole (51); the locking convex plate (7) is provided with a plurality of fastening screw holes (72) which can overlap with the fastening through hole (52); and the fastener (53) is a fastening bolt (531) which can penetrate the fastening through hole (52) and then be screwed into the fastening screw hole (72).

9. The pneumatic bellows stop valve according to claim 7, characterized in that: The protective plate (5) can be rotated in a direction close to the valve body (1) to a state perpendicular to the axis of the valve stem (3), and a positioning member (9) is provided on the support plate (22) for fixing the protective plate (5) in this state. One side of the locking protrusion (7) can be adjusted to a state flush with the bottom side of the valve body (1) in this state of the protective plate (5).

10. A pneumatic bellows stop valve according to claim 9, characterized in that: The positioning member (9) comprises a positioning rod (91) rotatably arranged on the side of the extension block (221) away from the valve body (1), and the rotation surface of the positioning rod (91) is flush with the side of the extension block (221) away from the valve body (1); when the protective plate (5) is rotated to a state perpendicular to the valve stem (3), the positioning rod (91) can be rotated to the side of the protective plate (5) facing the cylinder (41).

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