A stable diaphragm structure of a pneumatic diaphragm valve

Abstract

The utility model belongs to the technical field of diaphragm pneumatic valve, especially relates to a stable diaphragm pressing structure of pneumatic diaphragm valve diaphragm, including actuating mechanism casing, piston subassembly, spring, gas channel, the piston subassembly is connected swing axle, the lower extreme of swing axle is equipped with conical part, the below of conical part is equipped with diaphragm pressure axle, diaphragm pressure axle is used for the diaphragm pressing of diaphragm, the periphery of conical part is equipped with a plurality of ball bearings, ball bearings are located in the ball bearing movable cavity of diaphragm pressure axle, and conical part passes through ball bearing pressing diaphragm pressure axle action, the utility model provides a stable diaphragm pressing structure of pneumatic diaphragm valve diaphragm, under the same condition, the utility model's pressure stability is higher, and the force is bigger.

Description

Technical Field

[0001] This utility model belongs to the field of diaphragm pneumatic valve technology, and specifically relates to a stable pressure membrane structure for the diaphragm of a pneumatic diaphragm valve. Background Technology

[0002] A diaphragm pneumatic valve is a common type of shut-off valve. Its general structure includes a pneumatic actuator and a valve body. The diaphragm pneumatic valve is closed or opened by the pneumatic actuator. The pneumatic actuator generally includes a housing, piston, spring, movable shaft, air passage, diaphragm pressure shaft. The spring applies force to the piston, and the piston drives the movable shaft to move, thereby driving the diaphragm to move, so as to realize the closure or opening of the diaphragm pneumatic valve.

[0003] In the current structure, the moving shaft and the diaphragm pressure shaft are generally in surface contact. For high-pressure diaphragm valves, this structure has a drawback: the pressure stability between the moving shaft and the diaphragm pressure shaft is insufficient, or the pressure force is small under the same conditions. Summary of the Invention

[0004] This invention provides a stable pressure membrane structure for the diaphragm of a pneumatic diaphragm valve, which can solve the problems pointed out in the background art.

[0005] A stable diaphragm pressure structure for a pneumatic diaphragm valve includes an actuator housing, a piston assembly, a spring, and an air passage. A movable shaft is connected to the piston assembly, and a tapered portion is provided at the lower end of the movable shaft. A diaphragm pressure shaft is provided below the tapered portion. The diaphragm pressure shaft is used to press the diaphragm. A plurality of ball bearings are provided around the tapered portion, and the ball bearings are located in the ball bearing movement chamber of the diaphragm pressure shaft. The tapered portion presses the diaphragm pressure shaft to move through the ball bearings.

[0006] Preferably, the actuator housing and the valve body are connected by a threaded sleeve, and the ball bearing cavity is provided with an arc-shaped groove ring on the side near the actuator housing. The lower end of the actuator housing and the corresponding position of the threaded sleeve are provided with embedded limiting grooves, which are used to limit the arc-shaped groove ring.

[0007] Beneficial effects: This utility model provides a stable pressure membrane structure for the diaphragm of a pneumatic diaphragm valve. Under the same conditions, this utility model has higher pressure stability and greater force. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of this utility model.

[0009] Figure 2 This utility model Figure 1 Enlarged structural diagram at point A in the middle.

[0010] Explanation of reference numerals in the attached figures:

[0011] The following are the labels in the diagram: 1. Actuator housing; 2. Piston assembly; 3. Spring; 4. Air passage; 5. Moving shaft; 5. Conical part; 51. Diaphragm pressure shaft; 6. Diaphragm; 7. Ball; 8. Ball moving chamber; 9. Valve body; 10. Threaded sleeve; 11. Arc groove ring; 12. Embedded limit groove; 13. Detailed Implementation

[0012] The following describes a specific embodiment of the present invention in detail with reference to the accompanying drawings. However, it should be understood that the scope of protection of the present invention is not limited to the specific embodiment.

[0013] Example 1: As Figure 1-2 As shown, a stable diaphragm pressure structure for a pneumatic diaphragm valve includes an actuator housing 1, a piston assembly 2, a spring 3, and an air passage 4. A movable shaft 5 is connected to the piston assembly 2. The lower end of the movable shaft 5 is provided with a tapered portion 51. A diaphragm pressure shaft 6 is provided below the tapered portion 51. The diaphragm pressure shaft 6 is used to press the diaphragm 7. A plurality of balls 8, which can be steel balls, are provided around the tapered portion 51. The balls 8 are located in the ball movement cavity 9 of the diaphragm pressure shaft 6. The tapered portion 51 presses the diaphragm pressure shaft 6 to move through the balls 8. During operation, the balls 8 are tangent to the tapered portion 51 and the diaphragm pressure shaft 6, changing from surface contact to point contact. This reduces the force-bearing area, increases the pressure, and reduces friction, thereby ensuring the stability of the force and increasing the force under the same conditions.

[0014] In some embodiments, the actuator housing 1 and the valve body 10 are connected by a threaded sleeve 11. The ball moving cavity 9 is provided with an arc-shaped groove ring 12 on the side near the actuator housing 1, that is, the arc-shaped groove ring 12 has an arc-shaped groove, and the arc-shaped groove makes limiting contact with the ball 8. The lower end of the actuator housing 1 and the corresponding position of the threaded sleeve 11 are provided with embedded limiting grooves 13. The embedded limiting grooves 13 are used to limit the arc-shaped groove ring 12. This structure facilitates assembly and connection.

[0015] The above-disclosed embodiments are only a few specific examples of the present utility model. However, the embodiments of the present utility model are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present utility model.

Claims

1. A stable pressure structure for a pneumatic diaphragm valve diaphragm, comprising an actuator housing (1), a piston assembly (2), a spring (3), and an air passage (4), wherein a movable shaft (5) is connected to the piston assembly (2), characterized in that: The lower end of the movable shaft (5) is provided with a tapered part (51), and a diaphragm pressure shaft (6) is provided below the tapered part (51). The diaphragm pressure shaft (6) is used to press the diaphragm (7). A number of balls (8) are provided around the tapered part (51). The balls (8) are located in the ball movement cavity (9) of the diaphragm pressure shaft (6). The tapered part (51) presses the diaphragm pressure shaft (6) to move by the balls (8).

2. The stable pressure membrane structure of the diaphragm of a pneumatic diaphragm valve according to claim 1, characterized in that: The actuator housing (1) and the valve body (10) are connected by a threaded sleeve (11). The ball moving cavity (9) is provided with an arc-shaped groove ring (12) on the side near the actuator housing (1). The lower end of the actuator housing (1) and the corresponding position of the threaded sleeve (11) are provided with embedded limiting grooves (13). The embedded limiting grooves (13) are used to limit the arc-shaped groove ring (12).

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