A pneumatic structure for a pneumatic diaphragm shut-off valve

Abstract

This utility model relates to the field of diaphragm valve technology and discloses a pneumatic structure for a pneumatic diaphragm shut-off valve, including a lower housing, an upper housing fixedly mounted on the top of the lower housing, a sealing shell and a support frame fixedly mounted on the bottom of the lower housing, a diaphragm body fixedly mounted on the inner wall of the upper housing, a fixing plate fixedly mounted on the bottom of the diaphragm body, a valve stem fixedly mounted on the bottom of the fixing plate, and a spring provided on the inner wall of the lower housing. A sliding locking plate limits the position of the diaphragm body, preventing it from being ejected directly by the spring force and causing injury to maintenance workers. Pulling down a lever causes the lever to move a top pulling plate, which in turn moves one end of a connecting rope, causing the connecting rope to move the other end of the sliding locking plate, separating the sliding locking plate from the top of the diaphragm body, thus allowing the diaphragm body and the fixing plate to be removed.

Description

Technical Field

[0001] This utility model relates to the field of diaphragm valve technology, specifically a pneumatic structure for a pneumatic diaphragm shut-off valve. Background Technology

[0002] A pneumatic diaphragm shut-off valve is a valve powered by compressed air, which uses a diaphragm actuator to actuate the valve stem. It is primarily used for the rapid shut-off or connection of media in pipelines. With its compact structure, fast response, and moderate adjustment precision, it is widely used in automated control systems in industries such as petroleum, chemical, and power. It can flexibly control the flow of media based on control signals, ensuring the safe and stable operation of production processes.

[0003] Existing pneumatic diaphragm shut-off valves have a spring mechanism under the diaphragm during use. This can lead to a situation where, when the top cover is removed, there is no stop device above the diaphragm. In this case, the elasticity of the spring causes the diaphragm to be ejected quickly, which may injure maintenance personnel. At the same time, the valve stem is a major area for air leakage, and it is difficult to troubleshoot this fault in a timely manner, leading to equipment failure. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a pneumatic structure for a pneumatic diaphragm shut-off valve, which has the advantages of easy removal of the cover plate and leakage alarm, thus solving the problems mentioned in the background art.

[0005] This utility model provides the following technical solution: a pneumatic structure for a pneumatic diaphragm shut-off valve, comprising a lower housing, an upper housing fixedly mounted on the top of the lower housing, a sealing shell and a support frame fixedly mounted on the bottom of the lower housing, a diaphragm body fixedly mounted on the inner wall of the upper housing, a fixing plate fixedly mounted on the bottom of the diaphragm body, a valve stem fixedly mounted on the bottom of the fixing plate, a spring one provided on the inner wall of the lower housing, a limiting component provided on the inner wall of the lower housing, a sealing plate fixedly mounted on the bottom of the sealing shell, a first sealing ring fixedly mounted on the inner wall of the sealing shell, a second sealing ring fixedly mounted on the top of the sealing plate, an extension cylinder fixedly mounted on the bottom of the sealing plate, a sliding plate slidably connected to the inner wall of the extension cylinder, a second spring provided on the inner wall of the extension cylinder, a telescopic rod fixedly mounted on the bottom of the sliding plate, and a conspicuous coating fixedly mounted on the outer wall of the telescopic rod.

[0006] As a preferred technical solution of this utility model: the limiting component includes a support plate, a sliding locking plate and a pull plate are slidably connected to the inner wall of the support plate, a rotating rod is rotatably connected to the inner wall of the support plate, a spring is provided on the inner wall of the support plate, a connecting rope is fixedly installed on the outer wall of the sliding locking plate, a limiting rod is fixedly installed on the inner wall of the support plate, and a pull rod is fixedly installed at the bottom of the pull plate.

[0007] As a preferred technical solution of this utility model: the end of the connecting rope away from the sliding lock plate is connected to the top of the pull plate, and the middle section of the sliding lock plate overlaps with the outer wall of the rotating rod.

[0008] As a preferred technical solution of this utility model: the support plate passes through the film body and the fixing plate, and the support plate is in contact with the inner wall of the film body and the fixing plate, and the sliding locking plate is located at the top of the film body.

[0009] As a preferred technical solution of this utility model: the shape of the sliding plate is adapted to the shape of the inner wall of the extension cylinder, and the sliding plate is in close contact with the inner wall of the extension cylinder.

[0010] As a preferred technical solution of this utility model: the telescopic rod passes through the bottom of the extension cylinder, and the conspicuous coating is located at the bottom of the extension cylinder.

[0011] Compared with the prior art, the present invention has the following beneficial effects: 1. The pneumatic structure used in the pneumatic diaphragm shut-off valve limits the position of the diaphragm body by a sliding locking plate, thus preventing the diaphragm body from being directly ejected by the elastic force of the bottom spring and causing injury to maintenance workers. At this time, by pulling down the lever, the lever moves the top pull plate, which in turn moves one end of the connecting rope, causing the connecting rope to move the other end of the sliding locking plate, thus separating the sliding locking plate from the top of the diaphragm body, allowing the diaphragm body and the fixing plate to be removed.

[0012] 2. In this pneumatic structure used for pneumatic diaphragm shut-off valve, when air leakage occurs between the valve stem and the lower housing, gas enters between the sealing shell and the sealing plate, increasing the air pressure between them. This increases the air pressure at the top of the sliding plate, causing it to form a seal with the extension cylinder. Consequently, the sliding plate is pushed downwards, which in turn moves the telescopic rod downwards. This, in turn, moves the visible coating downwards. Maintenance personnel can then observe the position of the visible coating to determine if there is a leak. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic cross-sectional view of the present invention. Figure 3 This is a schematic diagram of the fixing plate structure of this utility model; Figure 4 This utility model Figure 2 Enlarged structural diagram at point A in the middle; Figure 5 This utility model Figure 3Enlarged structural diagram at point B.

[0014] In the diagram: 1. Lower housing; 2. Upper housing; 3. Sealing shell; 4. Support frame; 5. Membrane body; 6. Fixing plate; 7. Spring 1; 8. Limiting assembly; 9. Valve stem; 10. Sealing plate; 11. First sealing ring; 12. Second sealing ring; 13. Extension cylinder; 14. Spring 2; 15. Sliding plate; 16. Telescopic rod; 17. Highlighting coating; 801. Support plate; 802. Sliding lock plate; 803. Pull plate; 804. Rotating rod; 805. Spring 3; 806. Connecting rope; 807. Limiting rod; 808. Pull rod. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figure 1 - Figure 5 A pneumatic structure for a pneumatic diaphragm shut-off valve includes a lower housing 1, an upper housing 2 fixedly mounted on the top of the lower housing 1, a sealing shell 3 and a support frame 4 fixedly mounted on the bottom of the lower housing 1, a diaphragm body 5 fixedly mounted on the inner wall of the upper housing 2, a fixing plate 6 fixedly mounted on the bottom of the diaphragm body 5, a valve stem 9 fixedly mounted on the bottom of the fixing plate 6, a spring 7 and a limiting component 8 provided on the inner wall of the lower housing 1, a sealing plate 10 fixedly mounted on the bottom of the sealing shell 3, a first sealing ring 11 fixedly mounted on the inner wall of the sealing shell 3, a second sealing ring 12 fixedly mounted on the top of the sealing plate 10, an extension cylinder 13 fixedly mounted on the bottom of the sealing plate 10, a sliding plate 15 slidably connected to the inner wall of the extension cylinder 13, a second spring 14 provided on the inner wall of the extension cylinder 13, a telescopic rod 16 fixedly mounted on the bottom of the sliding plate 15, and a conspicuous coating 17 fixedly mounted on the outer wall of the telescopic rod 16.

[0017] In the above structure, the sealing shell 3 and the sealing plate 10 are sealed by the first sealing ring 11 and the second sealing ring 12, and the sealing plate 10 and the valve stem 9 are sealed by the second sealing ring 12, so that the sealing plate 10 and the sealing shell 3 are in a sealed state, thereby preventing gas from entering or exiting the inner wall of the sealing plate 10 and the sealing shell 3.

[0018] In a preferred embodiment: the limiting component 8 includes a support plate 801, a sliding locking plate 802 and a pull plate 803 are slidably connected to the inner wall of the support plate 801, a rotating rod 804 is rotatably connected to the inner wall of the support plate 801, a spring 805 is provided on the inner wall of the support plate 801, a connecting rope 806 is fixedly installed on the outer wall of the sliding locking plate 802, a limiting rod 807 is fixedly installed on the inner wall of the support plate 801, and a pull rod 808 is fixedly installed at the bottom of the pull plate 803.

[0019] In the above structure, two limiting rods 807 pass through both sides of the pull plate 803, so that the two limiting rods 807 limit the pull plate 803, thereby preventing the pull plate 803 from separating from the outer wall of the two limiting rods 807 when it moves, and thus preventing the pull plate 803 from tilting when it moves.

[0020] In a preferred embodiment: the end of the connecting rope 806 away from the sliding lock plate 802 is connected to the top of the pull plate 803, and the middle section of the sliding lock plate 802 overlaps with the outer wall of the rotating rod 804.

[0021] In the above structure, by pulling down the pull rod 808, the pull rod 808 causes the top pull plate 803 to move, which in turn causes the pull plate 803 to move one end of the connecting rope 806, which in turn causes the connecting rope 806 to move the other end of the sliding lock plate 802. At the same time, through the overlap between the connecting rope 806 and the outer wall of the rotating rod 804, the rotating rod 804 will not rub against the inner wall of the support plate 801.

[0022] In a preferred embodiment: the support plate 801 passes through the film body 5 and the fixing plate 6, and the support plate 801 is in contact with the inner wall of the film body 5 and the fixing plate 6, and the sliding locking plate 802 is located at the top of the film body 5.

[0023] In the above structure, the sliding locking plate 802 is popped out by the elasticity of the spring 805, so that the sliding locking plate 802 is attached to the top of the film body 5, thereby limiting the position of the film body 5, which in turn limits the position of the fixing plate 6, so that the film body 5 and the fixing plate 6 will not move upward.

[0024] In a preferred embodiment, the shape of the sliding plate 15 is adapted to the shape of the inner wall of the extension cylinder 13, and the sliding plate 15 is in contact with the inner wall of the extension cylinder 13.

[0025] In the above structure, the air pressure at the top of the sliding plate 15 increases, which in turn causes the sliding plate 15 to form a sealing relationship with the extension cylinder 13, which in turn causes the sliding plate 15 to be pushed downward, causing the sliding plate 15 to drive the telescopic rod 16 to move downward, which in turn causes the telescopic rod 16 to drive the eye-catching coating 17 to move downward.

[0026] In a preferred embodiment, the telescopic rod 16 passes through the bottom of the extension tube 13, and the conspicuous coating 17 is located at the bottom of the extension tube 13.

[0027] In the above structure, the extension cylinder 13 is penetrated by the telescopic rod 16, so that the telescopic rod 16 moves and causes the conspicuous coating 17 to move, thereby causing the telescopic rod 16 to move the conspicuous coating 17 downward. The air pressure inside the sealing shell 3 and the sealing plate 10 can be observed by observing the position of the conspicuous coating 17.

[0028] Working principle: When using the equipment, the air pipe is connected to the valve at the top of the upper housing 2. Air pressure controls the position of the diaphragm body 5 and the fixing plate 6, thereby changing the position of the valve stem 9. This valve stem 9 then controls the pump body at the bottom. When maintenance is required on the inner walls of the lower housing 1 and the upper housing 2, the upper housing 2 is removed. The sliding locking plate 802 then limits the position of the diaphragm body 5, preventing it from being ejected by the spring force of the bottom spring 7 and causing injury to the maintenance worker. Pulling down the pull rod 808 causes the top pull plate 803 to move, which in turn moves one end of the connecting rope 806, causing the connecting rope... 806 drives the sliding locking plate 802 at the other end to move, causing the sliding locking plate 802 to separate from the top of the membrane body 5, thereby allowing the membrane body 5 and the fixing plate 6 to be removed. When air leakage occurs between the valve stem 9 and the lower housing 1, gas enters between the sealing shell 3 and the sealing plate 10, increasing the air pressure between the sealing shell 3 and the sealing plate 10, which in turn increases the air pressure at the top of the sliding plate 15. This causes the sliding plate 15 to form a sealing relationship with the extension cylinder 13, which in turn pushes the sliding plate 15 downward, causing the sliding plate 15 to drive the telescopic rod 16 downward, which in turn causes the telescopic rod 16 to drive the conspicuous coating 17 downward. Maintenance personnel can observe the position of the conspicuous coating 17 to determine whether there is an air leak.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pneumatic structure for a pneumatic diaphragm shut-off valve, comprising a lower housing (1), characterized in that: The upper housing (2) is fixedly mounted on the top of the lower housing (1). A sealing shell (3) and a support frame (4) are fixedly mounted on the bottom of the lower housing (1). A membrane body (5) is fixedly mounted on the inner wall of the upper housing (2). A fixing plate (6) is fixedly mounted on the bottom of the membrane body (5). A valve stem (9) is fixedly mounted on the bottom of the fixing plate (6). A spring (7) is provided on the inner wall of the lower housing (1). A limiting component (8) is provided on the inner wall of the lower housing (1). A sealing shell (3) is fixedly mounted on the bottom of the sealing shell (3). The sealing plate (10) has a first sealing ring (11) fixedly installed on the inner wall of the sealing shell (3), a second sealing ring (12) fixedly installed on the top of the sealing plate (10), an extension cylinder (13) fixedly installed on the bottom of the sealing plate (10), a sliding plate (15) slidably connected to the inner wall of the extension cylinder (13), a second spring (14) provided on the inner wall of the extension cylinder (13), a telescopic rod (16) fixedly installed on the bottom of the sliding plate (15), and a conspicuous coating (17) fixedly installed on the outer wall of the telescopic rod (16).

2. The pneumatic structure for a pneumatic diaphragm shut-off valve according to claim 1, characterized in that: The limiting component (8) includes a support plate (801), a sliding locking plate (802) and a pull plate (803) are slidably connected to the inner wall of the support plate (801), a rotating rod (804) is rotatably connected to the inner wall of the support plate (801), a spring three (805) is provided on the inner wall of the support plate (801), a connecting rope (806) is fixedly installed on the outer wall of the sliding locking plate (802), a limiting rod (807) is fixedly installed on the inner wall of the support plate (801), and a pull rod (808) is fixedly installed at the bottom of the pull plate (803).

3. The pneumatic structure for a pneumatic diaphragm shut-off valve according to claim 2, characterized in that: The end of the connecting rope (806) away from the sliding lock plate (802) is connected to the top of the pull plate (803), and the middle section of the sliding lock plate (802) overlaps with the outer wall of the rotating rod (804).

4. The pneumatic structure for a pneumatic diaphragm shut-off valve according to claim 2, characterized in that: The support plate (801) passes through the film body (5) and the fixing plate (6), and the support plate (801) is in contact with the inner wall of the film body (5) and the fixing plate (6). The sliding locking plate (802) is located on the top of the film body (5).

5. The pneumatic structure for a pneumatic diaphragm shut-off valve according to claim 1, characterized in that: The shape of the sliding plate (15) is adapted to the shape of the inner wall of the extension cylinder (13), and the sliding plate (15) is in contact with the inner wall of the extension cylinder (13).

6. The pneumatic structure for a pneumatic diaphragm shut-off valve according to claim 1, characterized in that: The telescopic rod (16) passes through the bottom of the extension tube (13), and the conspicuous coating (17) is located at the bottom of the extension tube (13).

Images