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CN-224229390-U - High-pressure pneumatic control coaxial valve with outer flow channel structure

CN224229390UCN 224229390 UCN224229390 UCN 224229390UCN-224229390-U

Abstract

The utility model relates to a high-pressure pneumatic control coaxial valve with an outer flow channel structure, when the air pressure in a first air chamber and the air pressure in a second air chamber are different, a control piston is pushed to one side with lower air pressure so as to drive the whole valve core to slide, at the moment, an execution piston slides along with the valve core, and the execution piston slides so as to prop against or be far away from a first sealing part, so that the valve is switched to be in a closed or open state, and the pneumatic control of the utility model is realized. Of course, the flow rate may also be controlled by controlling the distance between the actuator piston and the first sealing member. By arranging the control piston in the control chamber, the control piston is only influenced by the gas pressure in the first gas chamber and the second gas chamber, but not by the fluid pressure in the outer flow path, so that the control piston can be stably controlled even under the condition of high fluid pressure in the outer flow path.

Inventors

  • SHI JUNBO

Assignees

  • 宁波艾希美工业自动化有限公司

Dates

Publication Date
20260512
Application Date
20250616

Claims (7)

  1. 1. The high-pressure pneumatic control coaxial valve with the outer flow channel structure is characterized by comprising an outer shell (1) and an inner shell (2), wherein a fixed seat (2.3) fixedly connected with the outer shell (1) is arranged on the inner shell (2), an outer flow channel (3) for fluid circulation is formed between the inner surface of the outer shell (1) and the outer surface of the inner shell (2), One end of the inner shell (2) is closed, the other end is provided with a baffle plate (2.1), a control cavity (5) is formed between the closed end of the inner shell (2) and the baffle plate (2.1), A valve core (4) is slidably connected to the partition board (2.1), one end of the valve core (4) is provided with a control piston (4.1), the control piston (4.1) is positioned in the control cavity (5) and separates the control cavity (5) into a first air chamber (5.1) and a second air chamber (5.2) which are not communicated, a first air hole (8) and a second air hole (9) for connecting a control air source are arranged on the fixing base (2.3), the first air hole (8) is communicated with the first air chamber (5.1), the second air hole (9) is communicated with the second air chamber (5.2), The valve is characterized in that an execution piston (4.2) is arranged at the other end of the valve core (4), an annular valve seat (6) is arranged on the outer shell (1) corresponding to the execution piston (4.2), a first sealing component (10) is connected to the valve seat (6), when the air pressure in the second air chamber (5.2) is larger than the air pressure in the first air chamber (5.1), the execution piston (4.2) slides against the first sealing component (10) to enable the valve to be in a closed state, and when the air pressure in the first air chamber (5.1) is larger than the air pressure in the second air chamber (5.2), the execution piston (4.2) slides away from the first sealing component (10) to enable the valve to be in an open state.
  2. 2. The high-pressure pneumatic control coaxial valve with the outer flow path structure according to claim 1, wherein a connecting rod (4.3) is arranged on the valve core (4), the connecting rod (4.3) is connected with the control piston (4.1) and the actuating piston (4.2), and the connecting rod (4.3) is arranged on the partition plate (2.1) in a penetrating mode and is connected with the partition plate in a sliding mode.
  3. 3. A high-pressure pneumatic coaxial valve of an outer flow path structure according to claim 2, characterized in that the connecting rod (4.3) is provided with a second sealing member (11) in cooperation with the partition plate (2.1), and a third sealing member (12) is provided between the outer surface of the control piston (4.1) and the inner surface of the control chamber (5).
  4. 4. A high pressure pneumatic control coaxial valve of an outer flow path structure according to claim 2, characterized in that the connecting rod (4.3) is provided with an oil seal member (7) in cooperation with the partition plate (2.1).
  5. 5. A high-pressure pneumatic coaxial valve of an outer flow path structure according to claim 1, characterized in that the actuating piston (4.2) is slidingly connected to the inner side of the inner housing (2), the actuating piston (4.2) being located on the other side of the partition (2.1) corresponding to the control piston (4.1), a fourth sealing member (13) being provided between the outer surface of the actuating piston (4.2) and the inner surface of the inner housing (2).
  6. 6. A high-pressure pneumatic coaxial valve of an outer flow path structure according to claim 1, characterized in that the actuating piston (4.2) is provided with communication holes (4.2.1) communicating with the outer flow path (3) on both sides.
  7. 7. The high-pressure pneumatic control coaxial valve with the outer flow path structure according to claim 1, wherein the inner surface of the inner shell (2) is convexly provided with a limiting step (2.2).

Description

High-pressure pneumatic control coaxial valve with outer flow channel structure Technical Field The utility model relates to the technical field of pneumatic control coaxial valves, in particular to a high-pressure pneumatic control coaxial valve with an outer flow channel structure. Background With the continued development of automated production technology, valves for controlling fluid flow conditions are also continually improving for adapting automated control. Wherein the coaxial valve adopts an integral structure of a valve body and an actuator, and the actuator is coincident with the axis of a fluid pipeline (fluid flow direction). The installation space is saved to the maximum extent, and the influence of the fluid pressure difference on the opening pressure of the valve is reduced to the minimum. The pneumatic actuator uses compressed air as energy, and has the characteristics of simple structure, reliable and stable action, larger output thrust, convenient maintenance, fire prevention and explosion prevention, and lower price, so that the pneumatic control coaxial valve produced by combining the two is widely used in industrial production. Compared with the traditional pneumatic control coaxial valve, the pneumatic control coaxial valve with the outer flow passage structure has the advantages that turbulence and vibration in the pneumatic control coaxial valve are reduced, and the size of the pneumatic control coaxial valve can be made smaller. However, when the internal pressure is high, the piston of the existing pneumatic control coaxial valve with the outer flow channel structure is affected by the fluid pressure in the outer flow channel, so that the pneumatic system has difficulty in accurately controlling the movement of the piston. Disclosure of utility model In view of the above-mentioned prior art, the present utility model is to provide a high-pressure pneumatic coaxial valve with an outer flow path structure, which avoids the influence of the pressure of the fluid in the outer flow path on the movement of the piston, so that the pneumatic system can accurately control the movement of the piston The technical proposal adopted by the utility model for solving the technical problems is that the high-pressure pneumatic control coaxial valve with an outer flow channel structure comprises an outer shell and an inner shell, wherein the inner shell is provided with a fixed seat fixedly connected with the outer shell, an outer flow channel for fluid circulation is formed between the inner surface of the outer shell and the outer surface of the inner shell, One end of the inner shell is closed, the other end of the inner shell is provided with a baffle, a control cavity is formed between the closed end of the inner shell and the baffle, The baffle plate is connected with a valve core in a sliding way, one end of the valve core is provided with a control piston which is positioned in the control cavity and separates the control cavity into a first air chamber and a second air chamber which are not communicated with each other, the fixing seat is provided with a first air hole and a second air hole which are used for connecting a control air source, the first air hole is communicated with the first air chamber, the second air hole is communicated with the second air chamber, The valve is characterized in that an execution piston is arranged at the other end of the valve core, an annular valve seat is arranged on the outer shell body corresponding to the execution piston, a first sealing part is connected to the valve seat, when the air pressure in the second air chamber is larger than the air pressure in the first air chamber, the execution piston slides against the first sealing part to enable the valve to be in a closed state, and when the air pressure in the first air chamber is larger than the air pressure in the second air chamber, the execution piston slides away from the first sealing part to enable the valve to be in an open state. Further, a connecting rod is arranged on the valve core, the connecting rod is connected with the control piston and the execution piston, and the connecting rod penetrates through the partition plate and is in sliding connection with the partition plate. Further, a second sealing part is arranged at the joint of the connecting rod and the partition plate, and a third sealing part is arranged between the outer surface of the control piston and the inner surface of the control cavity. Further, an oil seal component is arranged at the matching position of the connecting rod and the partition plate. Further, the actuating piston is slidably connected to the inner side of the inner housing, the actuating piston is located at the other side of the partition plate corresponding to the control piston, and a fourth sealing component is arranged between the outer surface of the actuating piston and the inner surface of the inner housing. Further, a communication hole is