Pneumatic eccentric expansion butterfly valve

Abstract

The utility model relates to the technical field of butterfly valves, in particular to a pneumatic eccentric expansion butterfly valve which comprises a valve pipe body. The top end of the valve rod rotationally penetrates through the outer part of the valve pipe body in a sealing manner, and a manual opening and closing structure is mounted at the top end of the valve rod; the manual opening and closing structure comprises a straight fluted disc fixedly installed outside the valve rod, and the straight fluted disc is meshed with a straight gear. A pneumatic bin box hermetically and rotatably penetrates through the top end of the valve rod. Due to the synergistic effect of a pneumatic mechanism and a manual mechanism, flexible control over the eccentric valve plate is achieved through the valve pipe body, and the stability and reliability of a fluid control system are greatly improved. In practical application, the dual-control mechanism can cope with various complex working environments and conditions, normal operation of the fluid system is ensured, an operator can easily close the valve pipe body through manual operation even if the pneumatic assembly breaks down or needs to be overhauled, and therefore safety of the fluid system is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of butterfly valves, in particular to a pneumatic eccentric expansion butterfly valve. Background Art

[0002] High-performance butterfly valve sealing rings are usually made of polytetrafluoroethylene. Due to their excellent sealing performance, reliable service life and cost-effectiveness, they are widely used in the field of industrial automation control. In particular, their application in the petroleum, chemical, electric power, air separation, high-rise buildings, water treatment and other industries is very mature. The prior art discloses a pneumatic expansion butterfly valve with a bulletin number of CN210372050U. The utility model is provided with a manual actuator. Through the engagement of the driving gear and the driven gear on the manual actuator, it is convenient for the staff to manually turn the handle to avoid the situation where the pneumatic actuator cannot work due to unexpected circumstances and the butterfly valve loses control. It can further improve the staff's control over the pneumatic expansion butterfly valve. Through the expansion and deflation of the valve seat by the pressure reducing valve, the friction between the valve plate and the valve seat can be reduced when the valve is opened and closed, thereby increasing the service life of the valve seat and improving the sealing of the expansion butterfly. A Chinese patent discloses a pneumatic eccentric expansion butterfly valve (authorization announcement number CN219366830U). This patent technology discloses a pneumatic eccentric expansion butterfly valve. Aiming at the problem that the existing butterfly valve opening device lacks a positioning structure, so that the sealing stability cannot be guaranteed, the following scheme is proposed, which includes a butterfly valve body, the butterfly valve body includes a frame and a valve plate, a rotating rod is rotatably installed on the bottom inner wall of the frame, the valve plate is fixedly sleeved on the outside of the rotating rod, a worm wheel is fixedly installed on the top of the rotating rod, and the same worm is rotatably installed on the front and rear inner walls of the frame, the worm is meshed with the worm wheel, a rotating disk is fixedly installed at the front end of the worm, a circular hole is opened on the front side of the rotating disk, and two guide plates are fixedly installed on the front side of the frame. The utility model has a reasonable structural design, and the rotating disk is fixed by setting a positioning component on the butterfly valve body, thereby ensuring the sealing of the butterfly valve, and it is convenient to control the switch of the butterfly valve, and the reliability is high. This patent technology solves the problem that the existing butterfly valve opening device lacks a positioning structure, so that the sealing stability cannot be guaranteed.

[0003] However, the pneumatic assembly in the prior art is used to quickly open and close the eccentric butterfly valve by gas pressurization, and there is a need to solve the problem that when the pneumatic assembly in the prior art cannot be used during maintenance, it can be manually opened and closed.

[0004] Therefore, those skilled in the art provide a pneumatic eccentric expansion butterfly valve to solve the problems raised in the above background technology. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides:

[0006] A pneumatic eccentric expansion butterfly valve comprises: a valve tube body; a valve stem is sealably rotatably mounted on the middle part of the valve tube body, the top end of the valve stem rotatably penetrates the outside of the valve tube body, and a manual opening and closing structure is mounted thereon; the manual opening and closing structure comprises a spur gear plate fixedly mounted on the outside of the valve stem, and the spur gear plate is meshed with a spur gear; a pneumatic box is sealably rotatably mounted on the top end of the valve stem, a pneumatic chamber is provided inside the pneumatic box, two pneumatic piston racks are movably provided inside the pneumatic chamber, the inner wall of the pneumatic piston rack is toothed, and is meshed with a gear rod, which is fixedly arranged on the outside of the valve stem.

[0007] Preferably: the manual opening and closing structure includes a sealing shaft disc fixedly mounted on the surface of the valve tube body, and a sealing groove disc is fixedly mounted on the surface of the sealing shaft disc.

[0008] The valve stem rotating seal passes through the sealing shaft disc and the top of the sealing groove disc.

[0009] Preferably: a large annular groove and a small annular groove are formed on the inner wall of the sealing groove disc.

[0010] The spur gear plate rotates inside the large annular groove, and the spur gear rotates inside the small annular groove.

[0011] Preferably: a transmission rod is fixedly mounted at the center of the spur gear, and a hand wheel is fixedly mounted at the bottom end of the transmission rod.

[0012] The bottom end of the transmission rod rotates and passes through the outside of the sealing shaft disc and the sealing groove disc.

[0013] Preferably, flanges are sealed and fixed at both ends of the valve tube body.

[0014] Preferably, an eccentric valve plate is fixedly mounted on the outside of the valve stem, and the eccentric valve plate is located inside the valve tube body.

[0015] Preferably, a top pressurizing pipe is connected through the top of the middle part of the pneumatic storage box, and bottom pressurizing pipes are connected through both sides of the pneumatic storage box.

[0016] Technical effects and advantages of the utility model:

[0017] In the utility model, the synergistic effect of the pneumatic and manual dual mechanisms enables the valve tube body to achieve flexible control of the eccentric valve plate, which greatly improves the stability and reliability of the fluid control system. In practical applications, this dual control mechanism can cope with various complex working environments and conditions to ensure the normal operation of the fluid system. Through manual operation, even when the pneumatic component fails or needs maintenance, the operator can easily close the valve tube body, thereby ensuring the safety of the fluid system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1It is a structural schematic diagram of a pneumatic eccentric expansion butterfly valve provided in an embodiment of the present application;

[0019] Figure 2 It is a schematic structural diagram of the front side of a pneumatic eccentric expansion butterfly valve provided in an embodiment of the present application;

[0020] Figure 3 It is a structural schematic diagram of an eccentric valve plate in a pneumatic eccentric expansion butterfly valve provided in an embodiment of the present application;

[0021] Figure 4 It is a structural schematic diagram of a manual opening and closing structure in a pneumatic eccentric expansion butterfly valve provided in an embodiment of the present application;

[0022] Figure 5 It is a structural schematic diagram of a pneumatic piston rack in a pneumatic eccentric expansion butterfly valve provided in an embodiment of the present application;

[0023] Figure 6 It is a schematic structural diagram of a pressurizing cylinder in a pneumatic eccentric expansion butterfly valve provided in an embodiment of the present application.

[0024] In the figure:

[0025] 1. Valve body; 2. Flange; 3. Valve stem; 4. Eccentric valve plate;

[0026] 5. Manual opening and closing structure; 501. Sealing shaft disc; 502. Sealing groove disc; 503. Large ring groove; 504. Small ring groove; 505. Spur gear disc; 506. Spur gear; 507. Transmission rod; 508. Hand wheel;

[0027] 6. Pneumatic storage box; 7. Pneumatic chamber; 8. Pneumatic piston rack; 9. Gear rod; 10. Pressure gauge; 11. Manual pressure relief valve; 12. Controller; 13. Top pressure pipe; 14. Bottom pressure pipe; 15. Pressure cylinder; 16. Piston body; 17. Cylinder. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific purposes.

[0029] Example:

[0030] See also Figures 1 to 6In this embodiment, a pneumatic eccentric expansion butterfly valve is provided, comprising: a valve tube body 1; a valve stem 3 is rotatably mounted in the middle of the valve tube body 1, the top of the valve stem 3 rotatably penetrates the outside of the valve tube body 1, and a manual opening and closing structure 5 is installed; the manual opening and closing structure 5 comprises a spur gear disc 505 fixedly mounted on the outside of the valve stem 3, and the spur gear disc 505 is meshed with a spur gear 506;

[0031] The top of the valve stem 3 is sealed and rotated through a pneumatic box 6, and a pneumatic chamber 7 is provided inside the pneumatic box 6. Two pneumatic piston racks 8 are movably provided inside the pneumatic chamber 7. The inner wall of the pneumatic piston rack 8 is toothed and meshed with a gear rod 9, which is fixedly arranged outside the valve stem 3.

[0032] The manual opening and closing structure 5 includes a sealing shaft disc 501 fixedly mounted on the surface of the valve tube body 1, and a sealing groove disc 502 is fixedly mounted on the surface of the sealing shaft disc 501; the valve stem 3 rotates and seals through the sealing shaft disc 501 and the top of the sealing groove disc 502; the inner wall of the sealing groove disc 502 is provided with a large annular groove 503 and a small annular groove 504; the spur gear disc 505 rotates and is located inside the large annular groove 503, and the spur gear 506 rotates and is located inside the small annular groove 504;

[0033] A transmission rod 507 is fixedly mounted at the center of the spur gear 506, and a hand wheel 508 is fixedly mounted at the bottom of the transmission rod 507; the bottom of the transmission rod 507 rotates and penetrates the outside of the sealing shaft disc 501 and the sealing groove disc 502;

[0034] Both ends of the valve tube body 1 are sealed and fixed with flanges 2; the valve stem 3 is externally fixedly equipped with an eccentric valve plate 4, and the eccentric valve plate 4 is located inside the valve tube body 1; the top of the middle part of the pneumatic tank box 6 is connected with a top pressure pipe 13, and both sides of the pneumatic tank box 6 are connected with bottom pressure pipes 14;

[0035] The top pressure tube 13 and the bottom pressure tube 14 are sealed and connected with a pressure cylinder 15 at one end away from the pneumatic chamber 6. A piston body 16 is movably sealed in the middle of the inner side of the pressure cylinder 15, and a cylinder 17 is connected to the bottom of the piston body 16. The pressure cylinder 15 is divided into a top air chamber and a bottom air chamber by the piston body 16. A pressure gauge 10 and a manual pressure relief valve 11 are installed on the pneumatic chamber 6. A controller 12 is installed on the front side wall of the pneumatic chamber 6.

[0036] Working principle:

[0037] When the valve tube body 1 is manually closed, the air pressure inside the pneumatic tank 6 is released through the manual pressure relief valve 11;

[0038] As a core component in the fluid control system, the valve body 1 is securely installed on the pipeline via the flange 2. During operation, the valve body 1 uses a pneumatic or manual mechanism to open and close the eccentric valve plate 4, thereby achieving on-off control of the fluid.

[0039] In the pneumatic control mode, when the valve tube body 1 needs to be opened, the cylinder 17 will be activated, causing the cylinder piston body 16 to move up to the top of the pressure cylinder 15; during this process, the air pressure in the pressure cylinder 15 will be transmitted to the pneumatic box 6 through the top pressure tube 13; then, the pneumatic piston rack 8 in the pneumatic box 6 moves in the pneumatic cavity 7, and drives the valve stem 3 to rotate 90° quickly with the help of the gear rod 9 meshing with the gear plate, thereby opening the eccentric valve plate 4;

[0040] On the contrary, when the cylinder 17 descends, the piston body 16 will move to the bottom of the pressure cylinder 15; at this time, the air between the two pneumatic piston racks 8 will be sucked into the pressure cylinder 15 through the top pressure tube 13; at the same time, the gas at the bottom of the piston body 16 in the pressure cylinder 15 will enter the pneumatic cavity 7 from both sides of the pneumatic box 6 along the bottom pressure tube 14; this process will push the pneumatic piston rack 8 from both sides of the pneumatic box 6 to the middle, prompting the valve stem 3 to reset, thereby realizing the closing of the eccentric valve plate 4;

[0041] However, in actual operation, components such as the top pressurizing tube 13 and the bottom pressurizing tube 14 may leak and need maintenance. In this case, if the pneumatic closing of the eccentric valve plate 4 fails, manual operation can be used. Specifically, by rotating the hand wheel 508, the transmission rod 507 and the spur gear 506 can be driven to rotate. The meshing rotation of the spur gear 506 and the spur gear plate 505 will drive the valve stem 3 to rotate, thereby realizing the opening and closing of the eccentric valve plate 4. This manual operation mode provides a convenient means for closing the valve tube body 1 when the pneumatic component fails or is under maintenance.

[0042] When the valve tube body 1 is manually closed, in order to ensure safety, the air pressure inside the pneumatic tank 6 needs to be released through the manual pressure relief valve 11 to prevent accidents caused by excessive air pressure;

[0043] In summary, the valve tube body 1 realizes flexible control of the eccentric valve plate 4 through the synergistic effect of the pneumatic and manual dual mechanisms; this not only improves the stability and reliability of the fluid control system, but also provides convenience for daily maintenance and overhaul.

[0044] In the present invention, unless otherwise clearly stipulated and limited, for example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, for ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0045] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. Structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to conventional means in the field unless otherwise specified and limited.

Claims

1. A pneumatic eccentric expansion butterfly valve, characterized in that: include: A valve tube body (1); a valve stem (3) is rotatably mounted in the middle of the valve tube body (1); the top end of the valve stem (3) rotatably penetrates the outside of the valve tube body (1) and is mounted with a manual opening and closing structure (5); The manual opening and closing structure (5) comprises a spur gear disc (505) fixedly mounted on the outside of the valve stem (3), and the spur gear disc (505) is meshed with a spur gear (506); The top end of the valve stem (3) is sealed and rotatably penetrated by a pneumatic box (6), a pneumatic chamber (7) is provided inside the pneumatic box (6), two pneumatic piston racks (8) are movably provided inside the pneumatic chamber (7), the inner wall of the pneumatic piston rack (8) is toothed and meshed with a gear rod (9), and the gear rod (9) is fixedly arranged outside the valve stem (3).

2. A pneumatic eccentric expansion butterfly valve according to claim 1, characterized in that: The manual opening and closing structure (5) comprises a sealing shaft disc (501) fixedly mounted on the surface of the valve tube body (1), and a sealing groove disc (502) is fixedly mounted on the surface of the sealing shaft disc (501).

3. A pneumatic eccentric expansion butterfly valve according to claim 2, characterized in that: The inner wall of the sealing groove plate (502) is provided with a large annular groove (503) and a small annular groove (504).

4. A pneumatic eccentric expansion butterfly valve according to claim 1, characterized in that: A transmission rod (507) is fixedly mounted at the center of the spur gear (506), and a hand wheel (508) is fixedly mounted at the bottom end of the transmission rod (507).

5. The pneumatic eccentric expansion butterfly valve according to claim 1, characterized in that: Flanges (2) are sealed and fixed at both ends of the valve tube body (1).

6. A pneumatic eccentric expansion butterfly valve according to claim 1, characterized in that: An eccentric valve plate (4) is fixedly mounted on the outside of the valve stem (3), and the eccentric valve plate (4) is located inside the valve tube body (1).

7. The pneumatic eccentric expansion butterfly valve according to claim 1, characterized in that: A top pressure pipe (13) is connected through the top of the middle part of the pneumatic storage box (6), and bottom pressure pipes (14) are connected through both sides of the pneumatic storage box (6).

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