A bidirectional normally closed pneumatic lift valve

Abstract

The present invention relates to the technical field of pneumatic components, and in particular to a bidirectional normally closed pneumatic lift valve, comprising a top cover, a link sleeve, a valve seat, an oil port sleeve and a valve sleeve, wherein the upper part of the link sleeve is fixedly connected to the top cover, the lower part of the link sleeve is fixedly connected to the upper part of the valve seat, the oil port sleeve is rotatably sleeved on the valve seat, the lower part of the valve seat is fixedly connected to the valve sleeve, the valve sleeve is provided with a working port 1 and a working port 2, a main valve core that can move up and down is provided in the valve sleeve, the working port 1 and the working port 2 are connected or closed by the up and down movement of the main valve core, a control valve core that can move up and down is provided in the valve seat, a spring seat that can move up and down is provided in the link sleeve, the upper part of the control valve core is fixed to the spring seat by a set screw, the lower part of the control valve core contacts the main valve core, and a spring is provided between the spring seat and the top cover. With such a structural arrangement, the valve has bidirectionality.

Description

Technical Field

[0001] The invention relates to the technical field of pneumatic components, in particular to a bidirectional normally closed pneumatic lifting valve. Background Art

[0002] Pneumatic lift valves refer to various pneumatic components that control the pressure, flow rate and flow direction of airflow in pneumatic systems and ensure the normal operation of pneumatic actuators or mechanisms. The structure of a pneumatic lift valve can be decomposed into two parts: the valve body and the valve core. The valve body includes structural components such as the valve seat and the valve hole. According to the relative position of the valve body and the valve core, there are two types: normally closed and normally open. The component that controls and adjusts the compressed air pressure is called a pressure control valve, the component that controls and adjusts the compressed air flow is called a flow control valve, and the component that changes and controls the flow direction of the airflow is called a directional control valve.

[0003] At present, the switch valves of sprinkler trucks are mostly used in conjunction with one-way valves. The defect of the one-way valve is that it does not have bidirectionality. Therefore, it is necessary to develop a pneumatic lifting valve with bidirectionality for use with the switch valves of sprinkler trucks. Summary of the invention

[0004] In view of the above problems, the present invention provides a bidirectional normally closed pneumatic lift valve, which effectively solves the deficiencies of the prior art.

[0005] In order to achieve the above object, the technical solution applied by the present invention is as follows:

[0006] A two-way normally closed pneumatic poppet valve comprises a top cover, a link sleeve, a valve seat, an oil port sleeve and a valve sleeve. The upper part of the link sleeve is fixedly connected to the top cover, the lower part of the link sleeve is fixedly connected to the upper part of the valve seat, the oil port sleeve is rotatably sleeved on the valve seat, the lower part of the valve seat is fixedly connected to the valve sleeve, the valve sleeve is provided with a working port 1 and a working port 2, a main valve core that can move up and down is provided in the valve sleeve, the working port 1 and the working port 2 are connected or closed by the up and down movement of the main valve core, a control valve core that can move up and down is provided in the valve seat, a spring seat that can move up and down is provided in the link sleeve, and the upper part of the control valve core is moved by The set screw is fixed on the spring seat, the lower part of the control valve core is in contact with the main valve core, a spring is provided between the spring seat and the top cover, a cavity one is provided between the main valve core and the valve seat, channel one and channel two are provided on the main valve core, one end of channel one is connected to cavity one, the other end of channel one is connected to working port two, one end of channel two is blocked corresponding to the tapered end of the control valve core, a steel ball and an elastic pin are provided in the other end of channel two, a control port is provided on the oil port socket, a channel three and cavity two are formed between the valve seat and the spring seat, one end of channel three is connected to cavity two, and the other end of channel three is connected to the control port.

[0007] According to the above solution, a filter screen and a filter screen pressing ring are provided at the connection between the channel 1 and the working port 2, and the filter screen is fixed on the main valve core through the filter screen pressing ring.

[0008] According to the above solution, the top cover is provided with ventilation holes.

[0009] According to the above solution, a copper pressure ring is provided on the valve seat to facilitate the passage of the control valve core, and a gasket three is provided between the copper pressure ring and the valve seat.

[0010] According to the above solution, a first rubber ring is sleeved on the upper portion of the outer wall of the valve sleeve, and a first gasket and a second rubber ring are sleeved on the lower portion of the outer wall of the valve sleeve.

[0011] According to the above solution, a second gasket, a third rubber ring and a second thread sealant are provided between the inner wall of the valve sleeve and the outer wall of the valve seat.

[0012] According to the above scheme, a rubber ring four is provided between the outer wall of the valve seat and the inner wall of the oil port socket, a rubber ring five is provided between the inner wall of the valve seat and the outer wall of the spring seat, and a rubber ring six and a thread sealant one are provided between the outer wall of the valve seat and the inner wall of the link sleeve.

[0013] According to the above scheme, a rubber ring seven is provided between the inner wall of the link sleeve and the outer wall of the spring seat, and a thread sealant three is provided between the inner wall of the link sleeve and the outer wall of the top cover.

[0014] Beneficial effects of the present invention:

[0015] The present invention adopts such a structural setting, wherein the working port 1 and the working port 2 are in a normally closed and non-connected state under normal conditions. When a high-pressure fluid medium is input into the working port 1, the fluid in the working port 1 will not enter the channel 2 due to the obstruction of the steel ball. Under the action of pressure, the fluid in the working port 1 will exert an overall upward force on the main valve core, and the main valve core drives the control valve core that abuts on the main valve core channel 2 to move upward together. Since the control valve core is fixed to the spring seat by a set screw, the spring seat is driven upward and the elastic force of the spring is overcome, so that the main valve core, the control valve core and the spring seat move upward synchronously. When the main valve core moves upward to a certain distance, the working port 1 is connected to the working port 2; when a high-pressure fluid medium is input into the working port 2, since the channel 1 connects the working port 2 with the cavity 1, the pressure of the cavity 1 and the working port 2 is balanced. Therefore, the pressure at the working port 2 The main valve core cannot be pushed upward. At this time, in order to connect working port 2 with working port 1, compressed gas needs to be introduced into the control port. The compressed gas at the control port flows to cavity 2 through channel 3. The pressure in cavity 2 increases and pushes the spring seat upward. The spring seat overcomes the elastic force of the spring and moves upward. Since the spring seat is fixedly connected to the control valve core, the control valve core also moves upward. The conical end at the bottom of the control valve core is separated from channel 2. At this time, cavity 1 is connected with channel 2, and the fluid in cavity 1 enters channel 2. Under the action of pressure, the fluid will cause the steel ball to overcome the elastic force of the elastic pin and move downward. At this time, channel 2 is connected with working port 1, and the fluid entering channel 2 flows out from working port 1. At this time, the pressure in cavity 1 is less than the pressure in working port 2. The pressure at working port 2 can push the main valve core upward as a whole. Working port 1 is connected with working port 2, and it has bidirectionality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 It is a sectional view of the overall structure of the present invention.

[0018] 1. Valve sleeve; 2. Main valve core; 3. Oil port socket; 4. Valve seat; 5. Spring seat; 6. Control valve core; 7. Set screw; 8. Link sleeve; 9. Spring; 10. Top cover; 11. Steel ball; 12. Elastic pin; 13. Rubber ring one; 14. Washer one; 15. Rubber ring two; 16. Washer two; 17. Rubber ring three; 18. Washer three; 19. Rubber ring four; 20. Rubber ring five; 21. Rubber ring six; 22. Rubber ring seven; 23. Filter; 24. Filter pressure ring; 25. Copper pressure ring; 26. Air vent; 27. Control port; 28. Thread sealant one; 29. ​​Thread sealant two; 30. Working port one; 31. Working port two; 32. Channel one; 33. Channel two; 34. Channel three; 35. Cavity one; 36. Cavity two; 37. Thread sealant three. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is described below in conjunction with the accompanying drawings and embodiments.

[0020] like Figure 1 and Figure 2 As shown, a bidirectional normally closed pneumatic poppet valve of the present invention comprises a top cover 10, a link sleeve 8, a valve seat 4, an oil port sleeve 3 and a valve sleeve 1, the upper part of the link sleeve 8 is fixedly connected to the top cover 10, the lower part of the link sleeve 8 is fixedly connected to the upper part of the valve seat 4, the oil port sleeve 3 is rotatably sleeved on the valve seat 4, the lower part of the valve seat 4 is fixedly connected to the valve sleeve 1, the valve sleeve 1 is provided with a working port 1 30 and a working port 2 31, a main valve core 2 which can move up and down is provided in the valve sleeve 1, the working port 1 30 and the working port 2 31 are connected or closed by the up and down movement of the main valve core 2, a control valve core 6 which can move up and down is provided in the valve seat 4, a spring seat 5 which can move up and down is provided in the link sleeve 8, the upper part of the control valve core 6 is fixed by a set screw 7 The spring seat 5 is fixed, the lower part of the control valve core 6 is against the main valve core 2, a spring 9 is arranged between the spring seat 5 and the top cover 10, a cavity 1 35 is arranged between the main valve core 2 and the valve seat 4, a channel 1 32 and a channel 2 33 are arranged on the main valve core 2, one end of the channel 1 32 is connected to the cavity 1 35, the other end of the channel 1 32 is connected to the working port 2 31, one end of the channel 2 33 is blocked corresponding to the tapered end of the control valve core 6, the other end of the channel 2 33 is provided with a steel ball 11 and an elastic pin 12, a control port 27 is arranged on the oil port socket 3, a channel 3 34 and a cavity 2 36 are formed between the valve seat 4 and the spring seat 5, one end of the channel 3 34 is connected to the cavity 2 36, and the other end of the channel 3 34 is connected to the control port 27. The above constitutes the basic structure of the present invention.

[0021] The present invention adopts such a structural setting, wherein the working port 1 30 and the working port 2 31 are in a normally closed and non-connected state under normal conditions. When a high-pressure fluid medium is input to the working port 1 30, the fluid in the working port 1 30 will not enter the channel 2 33 due to the obstruction of the steel ball 11. The fluid at the working port 1 30 will exert an overall upward force on the main valve core 2 under the action of pressure, and the main valve core 2 will drive the control valve core 6 that abuts on the channel 2 33 of the main valve core 2 to move upward together. Since the control valve core 6 is fixed to the spring seat 5 by the set screw 7, the spring seat 5 is driven upward and overcomes the elastic force of the spring 9, so that the main valve core 2, the control valve core 6 and the spring seat 5 move upward synchronously. When the main valve core 2 moves upward to a certain distance, the working port 1 30 and the working port 2 31 are connected;

[0022] When high-pressure fluid medium is input to the working port 2 31, since the channel 1 32 connects the working port 2 31 with the cavity 1 35, the pressure of the cavity 1 35 and the working port 2 31 are balanced. Therefore, the pressure at the working port 2 31 cannot push the main valve core 2 upward. At this time, in order to connect the working port 2 31 with the working port 1 30, it is necessary to introduce compressed gas into the control port 27. The compressed gas at the control port 27 flows to the cavity 2 36 through the channel 34. The pressure of the cavity 2 36 increases, pushing the spring seat 5 upward. The spring seat 5 overcomes the elastic force of the spring 9 and moves upward. Since the spring seat 5 is fixedly connected to the control valve core 6 1, so the control valve core 6 also moves up, and the tapered end at the bottom of the control valve core 6 is separated from the channel 2 33. At this time, the cavity 1 35 is connected with the channel 2 33, and the fluid in the cavity 1 35 enters the channel 2 33. Under the action of pressure, the fluid will cause the steel ball 11 to overcome the elastic force of the elastic pin 12 and move downward. At this time, the channel 2 33 is connected with the working port 1 30, and the fluid entering the channel 2 33 flows out from the working port 1 30. At this time, the pressure of the cavity 1 35 is less than the pressure of the working port 2 31. The pressure at the working port 2 31 can push the main valve core 2 to move up as a whole, and the working port 1 30 is connected with the working port 2 31.

[0023] In this embodiment, a filter screen 23 and a filter screen pressing ring 24 are provided at the connection between the channel 1 32 and the working port 2 31, and the filter screen 23 is fixed to the main valve core 2 through the filter screen pressing ring 24. Such a structural setting is adopted to prevent impurities from entering when inputting high-pressure fluid medium.

[0024] In this embodiment, the top cover 10 is provided with a vent hole 26. With such a structural arrangement, the inside of the top cover 10 is communicated with the outside, and a vacuum in the inner cavity between the spring seat 5 and the top cover 10 is avoided.

[0025] In this embodiment, the valve seat 4 is provided with a copper pressing ring 25 for the control valve core 6 to pass through, and a gasket 3 18 is provided between the copper pressing ring 25 and the valve seat 4. With such a structural setting, the control valve core 6 is limited by the copper pressing ring 25 to prevent it from deflecting when moving up and down, and the sealing between the copper pressing ring 25 and the valve seat 4 is achieved by the gasket 3 18.

[0026] In this embodiment, the upper part of the outer wall of the valve sleeve 1 is covered with a rubber ring 13, and the lower part of the outer wall of the valve sleeve 1 is covered with a gasket 14 and a rubber ring 2 15. With such a structural arrangement, the sealing between the valve sleeve 1 and the switch valve of the sprinkler truck is achieved.

[0027] In this embodiment, a gasket 2 16, a rubber ring 3 17 and a thread sealant 29 are arranged between the inner wall of the valve sleeve 1 and the outer wall of the valve seat 4. With such a structural arrangement, the inner wall of the valve sleeve 1 and the outer wall of the valve seat 4 are sealed.

[0028] In this embodiment, a rubber ring 19 is provided between the outer wall of the valve seat 4 and the inner wall of the oil port socket 3, a rubber ring 20 is provided between the inner wall of the valve seat 4 and the outer wall of the spring seat 5, and a rubber ring 21 and a thread sealant 28 are provided between the outer wall of the valve seat 4 and the inner wall of the link sleeve 8. With such a structural arrangement, the seal between the outer wall of the valve seat 4 and the inner wall of the oil port socket 3, the seal between the inner wall of the valve seat 4 and the outer wall of the spring seat 5, and the seal between the outer wall of the valve seat 4 and the inner wall of the link sleeve 8 are achieved.

[0029] In this embodiment, a rubber ring 22 is provided between the inner wall of the link sleeve 8 and the outer wall of the spring seat 5, and a thread sealant 37 is provided between the inner wall of the link sleeve 8 and the outer wall of the top cover 10. With such a structural arrangement, the sealing between the inner wall of the link sleeve 8 and the spring seat 5, and the sealing between the inner wall of the link sleeve 8 and the outer wall of the top cover 10 are achieved.

[0030] The technical solutions in the embodiments of the present invention are described above, but the present invention is not limited to the above-mentioned specific implementation modes. The above-mentioned specific implementation modes are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, which all belong to the protection scope of the present invention.

Claims

1. A bidirectional normally closed pneumatic lift valve, characterized in that: The invention comprises a top cover (10), a link sleeve (8), a valve seat (4), an oil port sleeve (3) and a valve sleeve (1), wherein the upper part of the link sleeve (8) is fixedly connected to the top cover (10), the lower part of the link sleeve (8) is fixedly connected to the upper part of the valve seat (4), the oil port sleeve (3) is rotatably sleeved on the valve seat (4), the lower part of the valve seat (4) is fixedly connected to the valve sleeve (1), and the valve sleeve (1) is provided with a working port 1 (30) and a working port 2 (31 ), a main valve core (2) movable up and down is provided in the valve sleeve (1), the working port 1 (30) and the working port 2 (31) are connected or closed by the up and down movement of the main valve core (2), a control valve core (6) movable up and down is provided in the valve seat (4), a spring seat (5) movable up and down is provided in the link sleeve (8), the upper part of the control valve core (6) is fixed to the spring seat (5) by a set screw (7), and the control valve core (6) is fixed to the spring seat (5) by a set screw (7). The lower part of the control valve core (6) contacts the main valve core (2), a spring (9) is provided between the spring seat (5) and the top cover (10), a cavity (35) is provided between the main valve core (2) and the valve seat (4), a channel (32) and a channel (33) are provided on the main valve core (2), one end of the channel (32) is connected to the cavity (35), the other end of the channel (32) is connected to the working port (31), one end of the channel (33) is blocked corresponding to the conical end of the control valve core (6), a steel ball (11) and an elastic pin (12) are provided in the other end of the channel (33), a control port (27) is provided on the oil port socket (3), a channel (34) and a cavity (36) are formed between the valve seat (4) and the spring seat (5), one end of the channel (34) is connected to the cavity (36), and the other end of the channel (34) is connected to the control port (27).

2. A bidirectional normally closed pneumatic lift valve according to claim 1, characterized in that: A filter screen (23) and a filter screen pressing ring (24) are provided at the connection between the channel 1 (32) and the working port 2 (31); the filter screen (23) is fixed to the main valve core (2) via the filter screen pressing ring (24).

3. A bidirectional normally closed pneumatic lift valve according to claim 1, characterized in that: The top cover (10) is provided with a ventilation hole (26).

4. A bidirectional normally closed pneumatic lift valve according to claim 1, characterized in that: The valve seat (4) is provided with a copper pressure ring (25) for facilitating the passage of the control valve core (6), and a gasket three (18) is provided between the copper pressure ring (25) and the valve seat (4).

5. A bidirectional normally closed pneumatic lift valve according to claim 1, characterized in that: The upper part of the outer wall of the valve sleeve (1) is covered with a rubber ring 1 (13), and the lower part of the outer wall of the valve sleeve (1) is covered with a gasket 1 (14) and a rubber ring 2 (15).

6. A bidirectional normally closed pneumatic lift valve according to claim 1, characterized in that: A second gasket (16), a third rubber ring (17) and a second thread sealant (29) are provided between the inner wall of the valve sleeve (1) and the outer wall of the valve seat (4).

7. A bidirectional normally closed pneumatic lift valve according to claim 1, characterized in that: A rubber ring four (19) is provided between the outer wall of the valve seat (4) and the inner wall of the oil port socket (3), a rubber ring five (20) is provided between the inner wall of the valve seat (4) and the outer wall of the spring seat (5), and a rubber ring six (21) and a thread sealant one (28) are provided between the outer wall of the valve seat (4) and the inner wall of the link sleeve (8).

8. A bidirectional normally closed pneumatic lift valve according to claim 1, characterized in that: A rubber ring seven (22) is provided between the inner wall of the link sleeve (8) and the outer wall of the spring seat (5), and a thread sealant three (37) is provided between the inner wall of the link sleeve (8) and the outer wall of the top cover (10).

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