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CN-121993653-A - Double-diaphragm pneumatic two-way valve

CN121993653ACN 121993653 ACN121993653 ACN 121993653ACN-121993653-A

Abstract

The invention discloses a double-diaphragm pneumatic two-way valve which comprises a valve body, a top cover, a bottom cover, a valve seat and a valve rod, wherein a hollow cavity is formed in the valve body, a medium inlet and a medium outlet which are communicated with the hollow cavity are formed in two sides of the valve body, the bottom end of the top cover is fixedly connected with the top end of the valve body, an air port A is formed in the top cover, the top end of the bottom cover is fixedly connected with the bottom end of the valve body, an air port B is formed in the bottom cover, the valve seat is positioned in the hollow cavity, the valve seat is fixedly connected with the valve body, a medium channel is formed in the valve seat, the bottom end of the valve rod penetrates through the medium channel, a diaphragm A, a valve plate and a diaphragm B are sequentially fixed on the valve rod from top to bottom, the diaphragm A is connected between the valve body and the top cover in a sealing mode, the diaphragm B is connected between the medium channel and the bottom cover in a sealing mode, and the valve plate is positioned between the medium channel and the diaphragm B. The invention utilizes the pressure difference to deform the diaphragm to drive the valve rod to work, can reduce friction, improve driving efficiency, reduce part abrasion and prolong the service life of the valve.

Inventors

  • LI XINGYU

Assignees

  • 李星雨

Dates

Publication Date
20260508
Application Date
20260408

Claims (8)

  1. 1. A double-diaphragm pneumatic two-way valve is characterized by comprising The valve comprises a valve body (1), wherein a hollow cavity (17) is formed in the valve body (1), and a medium inlet (10) and a medium outlet (11) which are communicated with the hollow cavity (17) are formed in two sides of the valve body (1); The top cover (2), the bottom end of the top cover (2) is fixedly connected with the top end of the valve body (1), and an air port A (4) is formed in the top cover (2); The bottom cover (3), the top of the bottom cover (3) is fixedly connected with the bottom of the valve body (1), and an air port B (6) is formed in the bottom cover (3); The valve seat (12) is positioned in the hollow cavity (17), the valve seat (12) is fixedly connected with the valve body (1), and a medium channel (16) is formed in the valve seat (12); Valve rod (8), valve rod (8) bottom is passed medium passageway (16), valve rod (8) top-down are fixed with diaphragm A (5), valve plate (9), diaphragm B (7) in proper order, diaphragm A (5) sealing connection in valve body (1) with between top cap (2), diaphragm B (7) sealing connection in valve body (1) with between bottom (3), valve plate (9) are located medium passageway (16) with between diaphragm B (7).
  2. 2. The double-diaphragm pneumatic two-way valve according to claim 1, wherein the diaphragm A (5) and the diaphragm B (7) are made of one of rubber materials, metal materials, polymer materials and composite materials.
  3. 3. A double diaphragm pneumatic two-way valve according to claim 1, characterized in that the equivalent stressed area of the diaphragm A (5) is larger than the stressed area of the valve plate (9).
  4. 4. The double-diaphragm pneumatic two-way valve of claim 1, wherein the vertical section of the valve seat (12) is a right triangle, the vertical part of the valve seat (12) is close to the medium outlet (11), the end part of the vertical part of the valve seat (12) is fixedly connected with the position of the valve body (1) at the top of the medium outlet (11), the end part of the transverse part of the valve seat (12) is fixedly connected with the position of the valve body (1) at the bottom of the medium inlet (10), and the medium channel (16) is positioned at the transverse part of the valve seat (12).
  5. 5. A double diaphragm pneumatic two-way valve according to claim 1, wherein the top end of the valve plate (9) is provided with a sealing ring (18).
  6. 6. The double-diaphragm pneumatic two-way valve according to claim 1 is characterized in that the top cover (2) is fixedly connected with the top end of the valve body (1) through bolts, and the bottom cover (3) is fixedly connected with the bottom end of the valve body (1) through bolts.
  7. 7. The double-diaphragm pneumatic two-way valve of claim 6, wherein the top end and the bottom end of the valve body (1) are provided with annular clamping grooves (15), and O-shaped sealing rings are arranged in the annular clamping grooves (15).
  8. 8. A double diaphragm pneumatic two-way valve as claimed in claim 1, wherein the top and bottom ends of the diaphragm A (5) and the diaphragm B (7) are provided with backing plates (19).

Description

Double-diaphragm pneumatic two-way valve Technical Field The invention relates to the technical field of valves, in particular to a double-diaphragm differential two-way valve. Background The valve is used as a key control element in a fluid transmission system and is widely applied to the fields of liquefied petroleum gas, medical equipment, biopharmaceuticals, food and beverage, new energy, semiconductor manufacturing and the like. The existing valve mainly comprises ball valves, angle valves, butterfly valves, gate valves and the like, wherein the ball valves, the butterfly valves and the gate valves all need pneumatic actuators (generally called air cylinders) to generate force and moment required by valve action, the combined volumes of the two parts are large, space occupation is unfriendly, a piston in the air cylinder is in sliding seal, driving efficiency is reduced due to the fact that part of energy is lost due to friction resistance, the valve is usually in failure due to sealing failure of the air cylinder, the packing of the valve also increases friction force and fault points, the packing is frequently maintained and replaced, the ball valves and the gate valves are closely attached to valve seats due to the fact that friction force is generated in the moving process, transmission efficiency is reduced, protection effects on small particle impurities in media are poor, sealing surfaces and blocking cannot be achieved once the impurities are blocked into contact surfaces which slide relatively, the angle valves and the butterfly valves do not have self-adaption capability, sealing or opening high-pressure difference media channels are required to be sealed by means of the force of the springs and the air cylinders, sealing force cannot be adjusted adaptively according to media pressure difference, the sealing force is required to be met when the valves work under the working conditions of any pressure difference, the pressure difference is the highest at the two ends of the valves, driving energy is caused, the part is wasted, the electromagnet is easy to damage due to the fact that the electromagnetic valve is used, and the air gap is more, and the electromagnetic valve has high power, and the whole-gap can not directly reach the required to be used for a large-level. Therefore, there is a need for a two-piece differential two-way valve that combines a cylinder and a valve, reduces friction, moves a valve plate using a pressure differential, and is applied to a large caliber. Disclosure of Invention It is an object of the present invention to provide a two-piece differential two-way valve that solves the above-mentioned problems of the prior art. In order to achieve the above purpose, the present invention adopts the following technical scheme: a dual-diaphragm differential two-way valve comprises a valve body, a top cover, a bottom cover, a valve seat and a valve rod, A hollow cavity is formed in the valve body, and a medium inlet and a medium outlet which are communicated with the hollow cavity are formed in two sides of the valve body; The bottom end of the top cover is fixedly connected with the top end of the valve body, and an air port A is formed in the top cover; The top end of the bottom cover is fixedly connected with the bottom end of the valve body, and an air port B is formed in the bottom cover; The valve seat is positioned in the hollow cavity, the valve seat is fixedly connected with the valve body, and a medium channel is formed in the valve seat; The bottom end of the valve rod penetrates through the medium channel, the valve rod is sequentially fixed with a membrane A, a valve plate and a membrane B from top to bottom, the membrane A is connected between the valve body and the top cover in a sealing mode, the membrane B is connected between the valve body and the bottom cover in a sealing mode, and the valve plate is located between the medium channel and the membrane B. Further, the membrane A and the membrane B are made of one of rubber materials, metal materials, high polymer materials and composite materials. Further, the equivalent stressed area of the diaphragm A is larger than the stressed area of the valve plate. In the invention, when the pressures of the diaphragm A and the valve plate are equal, the resultant force is upward, the upward resultant force is increased along with the increase of the medium pressure, the upward resultant force is also reduced along with the decrease of the medium pressure, the sealing force between the valve plate and the medium channel can be improved under high pressure difference, the sealing force can be reduced under low pressure difference, so as to adapt to different sealing forces required under different medium pressures, and the stress of the sealing ring on the valve plate is reduced, so that the service life of the sealing ring is prolonged. Further, the vertical section of the valve seat is a right triangle, the vertical