CN220152012U

CN220152012U - Low-pressure automatic cut-off valve

Info

Publication number: CN220152012U
Application number: CN202321100543.1U
Authority: CN
Inventors: 陈平; 张均华; 温雄伟; 邓成柱; 钟开锋
Original assignee: Guangdong Southchina Special Gas Institute Co ltd
Current assignee: Guangdong Southchina Special Gas Institute Co ltd
Priority date: 2023-05-09
Filing date: 2023-05-09
Publication date: 2023-12-08
Anticipated expiration: 2033-05-09

Abstract

The utility model relates to a low-pressure automatic cut-off valve, comprising: the cylinder is internally provided with a piston, the top of the piston is provided with a pressure regulating spring, the pressure regulating spring is in butt joint with the top of the cylinder, the bottom of the piston is connected with a hollow valve rod, the upper end of the valve rod is communicated with the lower cavity of the cylinder, and the lower end of the valve rod penetrates into the valve body from the bottom of the cylinder; an air inlet channel and an air outlet channel are arranged in the valve body, the air inlet channel is communicated with the lower end of the valve rod, the lower end of the valve rod is provided with a valve clack, and the valve clack is abutted against and blocks the air outlet channel. According to the embodiment of the utility model, the acting force of air pressure on the piston and the reaction force of the pressure regulating spring on the piston are utilized to sense the air pressure change, when the air pressure is lower than a certain critical value and the piston cannot be pushed to move the valve clack away or even the air pressure is lower, the valve clack can automatically block the air outlet channel to realize the cutting-off of the passage, and the opening and closing of the valve can be quickly and automatically responded along with the change of the air pressure in the pipeline, so that the danger is avoided; the method is applicable to a remote electroless working environment without electric power control.

Description

Low-pressure automatic cut-off valve

Technical Field

The utility model relates to the technical field of control valves, in particular to a low-pressure automatic cut-off valve.

Background

A shut-off valve is a common valve type, which is a device for controlling or shutting off the movement of a fluid (e.g., water, air, oil, etc.), the principle of operation of which is based on the valve changing the size of a passage or closing a passage by moving an internal part. The internal structure of the traditional manual cut-off valve is generally composed of a valve body, a valve cover, a valve core or a valve plate, a sealing ring and other parts, is controlled by a handle or a knob, and moves the parts such as a bolt, a ball, a disc or a piston in the valve through rotation or push-pull, so that the valve core or the valve plate can be tightly attached to a valve seat, thereby preventing the flow of fluid, and the valve is in a closed state; when the valve needs to be opened, the valve core or the valve plate can be pushed or rotated, so that the valve is opened, and fluid can pass through the valve.

Some automatic shut-off valves are also on the market, and automatic control is realized through built-in electronic devices such as a sensor, an actuator, a motor and the like, for example, in the running process of low-temperature liquefied carbon dioxide gas pipeline equipment at the upstream end, the air pressure in the pipeline cannot be lower than a certain pressure value, otherwise, the pipeline is easy to be blocked by dry ice, and potential safety hazards appear.

In the existing automatic shut-off valve, certain reaction time is required for signal transmission of a sensor, operation and execution of an actuator, starting of a motor and the like in the running process, so that the operation of the shut-off valve cannot be timely and fast, and certain production danger is associated; and the start and stop of the operation function are also affected by the existence of electric power, and the operation is limited in remote places such as construction sites, gasification stations and the like.

Disclosure of Invention

The utility model aims to provide a low-pressure automatic cut-off valve so as to improve the cut-off speed of the valve and break through the use limit of the existing electric power control valve in a remote place.

In order to achieve the above purpose, the present utility model provides the following technical solutions: a low pressure automatic shut off valve comprising: the bottom of the air cylinder is connected with the top of the valve body;

the cylinder is internally provided with a piston, the side surface of the piston is in sliding contact with the inner wall of the cylinder to divide the inner cavity of the cylinder into an upper cavity and a lower cavity, the top of the piston is provided with a pressure regulating spring, the upper end of the pressure regulating spring is in contact with the inner wall of the top of the cylinder, the bottom of the piston is connected with a hollow valve rod, the upper end of the valve rod is communicated with the lower cavity of the cylinder, and the lower end of the valve rod penetrates out from the bottom of the cylinder and penetrates from the top of the valve body;

an air inlet channel and an air outlet channel are arranged in the valve body, the air inlet channel is communicated with the lower end of the valve rod, a valve clack is arranged at the lower end of the valve rod, and the valve clack is abutted against and blocks the air outlet channel;

after the air inlet channel is communicated with an external air inlet device, air enters a lower cavity of the air cylinder through the valve rod and generates upward acting force on the bottom of the piston, so that the piston upwards extrudes the pressure regulating spring; when the acting force of gas on the bottom of the piston is larger than the reaction force of the pressure regulating spring on the top of the piston, the pressure regulating spring contracts, the piston slides upwards and drives the valve rod, and the valve rod lifts the valve clack to separate the valve clack from the air outlet channel, so that the air inlet channel is communicated with the air outlet channel.

Preferably, the upper end of the valve rod is provided with an air outlet hole, the air outlet hole is communicated with the lower cavity, the lower end of the valve rod is provided with an air inlet hole, and the air inlet hole is communicated with the air inlet channel.

Preferably, an upper cylinder cover is connected with an upper end cover of the cylinder, and a lower cylinder cover is connected with a lower end cover of the cylinder; the lower end of the valve body is connected with a lower valve cover in a closing manner, the upper end of the valve body is connected with an upper valve cover in a closing manner, and the upper valve cover is connected with the lower cylinder cover.

Preferably, the upper cylinder cover is connected with a pressure regulating rod in a threaded manner, and the lower end of the pressure regulating rod penetrates through the upper cylinder cover to be connected with the top of the pressure regulating spring so as to regulate the compression degree of the pressure regulating spring; the upper end of the pressure regulating rod is provided with a lock nut, a cover cap is arranged outside the lock nut, and the cover cap is in threaded connection with the upper cylinder cover.

Preferably, the two ends of the pressure regulating rod are provided with vent holes in axial communication, so that the upper cavity of the cylinder is communicated with the outside.

Preferably, a first sealing ring is arranged at the joint of the cylinder and the upper cylinder cover and the joint of the cylinder and the lower cylinder cover; and a fastening screw is connected between the upper cylinder cover and the lower cylinder cover.

Preferably, the connection part of the valve body and the upper valve cover and the connection part of the valve body and the lower valve cover are both provided with second sealing rings.

Preferably, a third sealing ring is arranged at the joint of the valve rod and the lower cylinder cover and the joint of the valve rod and the upper valve cover.

Preferably, the side surface of the piston is also provided with a fourth sealing ring in a surrounding manner, and the fourth sealing ring is abutted with the inner wall of the cylinder.

Preferably, a fifth sealing ring is arranged at the joint of the valve clack and the air outlet channel.

Compared with the prior art, the utility model has the beneficial effects that:

1. the valve clack is connected with a piston mechanism, the air inlet channel is communicated with the lower cavity of the cylinder where the piston is positioned through a hollow valve rod connected with the piston, and the air pressure of the air inlet is utilized to push the piston to move so as to drive the valve clack to move, so that the function of controlling the opening and closing of the air outlet channel is realized; the upward movement of the piston is limited by the pressure regulating spring arranged at the top of the piston, the air pressure change is sensed by utilizing the acting force of air pressure on the piston and the reaction force of the pressure regulating spring on the piston, when the air pressure is lower than a certain critical value and the piston cannot be pushed to move the valve clack away or even the air pressure is lower, the valve clack can automatically block the air outlet channel to realize the cutting-off passage, the opening and closing of the valve can quickly and automatically respond with the change of the air pressure in the pipeline, the danger is avoided, and the valve can be used in working environments such as remote electroless construction sites, gasification stations and the like without electric control.

Drawings

The accompanying drawings are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate the utility model and together with the embodiments of the utility model, serve to explain the utility model. In the drawings:

FIG. 1 is a schematic cross-sectional view of a low-pressure automatic shut-off valve according to the present utility model in a closed state of an inlet channel and an outlet channel;

fig. 2 is a schematic cross-sectional view of the low-pressure automatic shut-off valve according to the present utility model in a state in which the inlet channel is in communication with the outlet channel.

Reference numerals:

10. a cylinder; 11. a piston; 111. a fourth seal ring; 12. a pressure regulating spring; 13. an upper cylinder cover; 14. a lower cylinder cover; 15. a pressure regulating rod; 151. a vent hole; 16. a lock nut; 17. capping; 18. a first seal ring; 19. fastening a screw;

20. a valve body; 21. an air intake passage; 22. an air outlet channel; 23. an upper valve cover; 24. a lower valve cover; 25. a second seal ring;

30. a valve stem; 301. an air inlet hole; 302. an air outlet hole; 31. a valve flap; 311. a fifth seal ring; 32. and a third sealing ring.

Detailed Description

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments, and furthermore, the terms "first", "second", "third", "up, down, left, right", etc. are used for descriptive purposes only for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, so that the terms describing positional relationships in the drawings are only for exemplary illustration, and should not be construed as limiting, indicating or implying relative importance to the present patent, and the specific meanings of the terms described above may be understood by those of ordinary skill in the art according to specific circumstances. Meanwhile, in the description of the present utility model, unless explicitly stated and defined otherwise, the terms "connected", "connected" and "connected" should be interpreted broadly, and for example, may be fixedly connected, detachably connected, or integrally connected; the mechanical connection and the electrical connection can be adopted; all other embodiments, which may be directly or indirectly through intermediaries, which may be obtained by a person of ordinary skill in the art without inventive effort based on the embodiments of the present utility model are within the scope of the present utility model.

The implementation of the present utility model will be described in detail below with reference to specific embodiments.

As shown in fig. 1-2, embodiments provided for by the present utility model.

The embodiment of the utility model provides a low-pressure automatic cut-off valve, which comprises the following components: the cylinder 10 and the valve body 20, the top of valve body 20 is connected to the bottom of cylinder 10, specifically, the upper end of cylinder 10 closes and is connected with cylinder cap 13, the lower extreme of cylinder closes and is connected with cylinder cap 14 down, the installation and the maintenance of the internal part of cylinder 10 of being convenient for, the junction of cylinder 10 and upper cylinder cap 13 and the junction of cylinder 10 and lower cylinder cap 14 all are provided with first sealing washer 18 to guarantee the inside gas tightness of cylinder 10, be connected with fastening screw 19 between upper cylinder cap 13 and the lower cylinder cap 14, can adjust the inseparable degree that upper cylinder cap 13 and lower cylinder cap 14 were closed, further guarantee the inside gas tightness of cylinder 10. The lower cover of the valve body 20 is connected with a lower valve cover 24, the upper cover of the valve body 20 is connected with an upper valve cover 23, so that the installation and maintenance of internal parts of the valve body 20 are facilitated, and the connection part of the valve body 20 and the upper valve cover 23 and the connection part of the valve body 20 and the lower valve cover 24 are both provided with a second sealing ring 25 for ensuring the air tightness of the interior of the valve body 20. The upper valve cover 23 is connected with the lower cylinder cover 14, and the cylinder 10 and the valve body 20 are required to be ensured not to be loosened and separated.

The cylinder 10 is internally provided with a piston 11, the side surface of the piston 11 is in sliding contact with the inner wall of the cylinder 10, the side surface of the piston 11 is also provided with a fourth sealing ring 111 in surrounding contact with the inner wall of the cylinder, the inner cavity of the cylinder 10 is divided into an upper cavity and a lower cavity, the top of the piston 11 is provided with a pressure regulating spring 12, the upper end of the pressure regulating spring 12 is in contact with the inner wall of the top of the cylinder 10, and the fourth sealing ring 111 has the function of preventing gas from leaking from the lower cavity of the cylinder 10 into the upper cavity to generate downward acting force on the piston 11 and preventing the balance of the relative acting force of pipeline air pressure and the pressure regulating spring 12 on the piston 11 from being damaged. The bottom of the piston 11 is connected with a hollow valve rod 30, the upper end of the valve rod 30 is communicated with the lower cavity of the cylinder 10, specifically, the upper end of the valve rod 30 is provided with an air outlet hole 302, the air outlet hole 302 is communicated with the lower cavity, and the lower end of the valve rod 30 penetrates out from the bottom of the cylinder 10 and penetrates from the top of the valve body 20; the third sealing rings 32 are arranged at the joint of the valve rod 30 and the lower cylinder cover 14 and the joint of the valve rod 30 and the upper valve cover 23, so that gas is prevented from leaking from the valve body 20 or the lower cavity of the cylinder 10 in the moving process of the valve rod 30, and the respective air tightness is ensured. An air inlet channel 21 and an air outlet channel 22 are arranged in the valve body 20, the air inlet channel 21 is communicated with the lower end of the valve rod 30, specifically, the lower end of the valve rod 30 is provided with an air inlet hole 301, the air inlet hole 301 is communicated with the air inlet channel, so that the air inlet channel 21 is communicated with the lower cavity of the cylinder 10, and air can enter the lower cavity of the cylinder 10 from the air inlet channel 21 through the hollow valve rod 30, so that the piston 11 is pushed to move. The lower end of the valve rod 30 is provided with a valve clack 31, the valve clack 31 is abutted against and blocks the air outlet channel 22, and the separation or connection of the valve clack 31 and the air outlet channel 22 can be controlled so as to control the communication or closing of the air inlet channel 21 and the air outlet channel 22. The fifth sealing ring 311 is arranged at the connection part of the valve clack 31 and the air outlet channel 22 to ensure that the valve clack 31 can seal the air outlet channel 22 and prevent gas leakage, specifically, the bottom of the valve clack 31 is provided with a downward conical surface, the tighter the valve clack 31 is pressed down, the tighter the air outlet channel 22 is blocked, and the fifth sealing ring 311 can be arranged at the bottom of the valve clack 31 or at the port of the air outlet channel 22.

After the air inlet channel 21 is communicated with an external air inlet device, air enters the lower cavity of the cylinder 10 through the valve rod 30 and generates upward acting force on the bottom of the piston 11, so that the piston 11 upwards presses the pressure regulating spring 12; as shown in fig. 2, when the acting force of the gas on the bottom of the piston 11 is greater than the reaction force of the pressure regulating spring 12 on the top of the piston 11, the pressure regulating spring 12 contracts, the piston 11 slides upwards and drives the valve rod 30, the valve rod 30 lifts the valve clack 31 to separate the valve clack 31 from the air outlet channel 22, and the air inlet channel 21 is communicated with the air outlet channel 22; as shown in fig. 1, when the air pressure is below a certain threshold value and the piston 11 cannot be pushed to move the valve clack 31 away, even if the air pressure is lower, the valve clack 31 will automatically block the air outlet channel 22 to realize the shut-off of the passage. The manufacturer can preset the elasticity of the pressure regulating spring 12 during production and installation to determine the air pressure critical value of the low-pressure automatic cut-off valve. According to the embodiment of the utility model, the upward movement of the piston 11 is limited by the pressure regulating spring 12 arranged at the top of the piston 11, the air pressure change is sensed by utilizing the acting force of air pressure on the piston 11 and the reaction force of the pressure regulating spring 12 on the piston 11, when the air pressure is lower than a certain critical value and the piston 11 cannot be pushed to move the valve clack 31 away or even the air pressure is lower, the valve clack 31 can automatically block the air outlet channel 22 to realize the cutting off of a passage, the opening and closing of the valve can be quickly and automatically responded along with the air pressure change in a pipeline, the occurrence of danger is avoided, meanwhile, the valve can be used in working environments such as a remote electroless building site, a gasification station and the like and can be flexibly set for users through pressure gauges at the upstream and the downstream of the pipeline and production requirements.

Furthermore, the upper cylinder cover 13 is connected with the pressure regulating rod 15 in a threaded manner, the lower end of the pressure regulating rod 15 penetrates through the upper cylinder cover 13 to be connected with the top of the pressure regulating spring 12, so that the compression degree of the pressure regulating spring 12 can be regulated, a user can flexibly set the pressure gauge and the production requirement on the upstream and downstream of the pipeline, and when the compression degree of the pressure regulating spring 12 corresponding to the pressure of the critical value is set, the user only needs to rotate the pressure regulating rod 15 to regulate the pressure regulating spring 12, so that the operation is very convenient and the applicability is strong. The upper end of the pressure regulating rod 15 is provided with a lock nut 16, after the contraction degree of the pressure regulating spring 12 is set, the pressure regulating rod 15 can be further limited by using the lock nut 16, the looseness of the pressure regulating rod 15 is prevented, a cap 17 is arranged outside the lock nut 16, the cap 17 is in threaded connection with the upper cylinder cover 13, the pressure regulating rod 15 is protected, and the influence of external force impact on the pressure regulating rod is avoided. It should be noted that, the two ends of the pressure regulating rod 15 are provided with the vent hole 151 along the axial communication, so that the upper cavity of the cylinder is communicated with the outside, and if a trace amount of gas enters the upper cavity of the cylinder 10 through the fourth sealing ring 111 arranged outside the piston 11 in the cylinder 10 in a long-term working state, the trace amount of gas can be discharged to the outside of the cylinder 10 through the vent hole 151 in the pressure regulating rod 15, so that the upper cavity of the cylinder 10 is prevented from generating downward acting force to damage the balance of the upper pressure and the lower pressure of the piston 11.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. A low pressure automatic shut off valve, comprising: the device comprises a cylinder (10) and a valve body (20), wherein the bottom of the cylinder (10) is connected with the top of the valve body (20);

a piston (11) is arranged in the cylinder (10), the side surface of the piston (11) is in sliding contact with the inner wall of the cylinder (10), the inner cavity of the cylinder (10) is divided into an upper cavity and a lower cavity, a pressure regulating spring (12) is arranged at the top of the piston (11), the upper end of the pressure regulating spring (12) is in contact with the inner wall of the top of the cylinder (10), a hollow valve rod (30) is connected to the bottom of the piston (11), the upper end of the valve rod (30) is communicated with the lower cavity of the cylinder (10), and the lower end of the valve rod (30) penetrates out from the bottom of the cylinder (10) and penetrates into the top of the valve body (20);

an air inlet channel (21) and an air outlet channel (22) are arranged in the valve body (20), the air inlet channel (21) is communicated with the lower end of the valve rod (30), a valve clack (31) is arranged at the lower end of the valve rod (30), and the valve clack (31) is abutted against and blocks the air outlet channel (22);

after the air inlet channel (21) is communicated with an external air inlet device, air enters the lower cavity of the air cylinder (10) through the valve rod (30) and generates upward acting force on the bottom of the piston (11), so that the piston (11) presses the pressure regulating spring (12) upward; when the acting force of gas on the bottom of the piston (11) is larger than the reaction force of the pressure regulating spring (12) on the top of the piston (11), the pressure regulating spring (12) contracts, the piston (11) slides upwards and drives the valve rod (30), and the valve rod (30) lifts the valve clack (31) to separate the valve clack (31) from the air outlet channel (22), so that the air inlet channel (21) is communicated with the air outlet channel (22).

2. The low-pressure automatic shut-off valve according to claim 1, wherein an air outlet hole (302) is provided at the upper end of the valve rod (30), the air outlet hole (302) is communicated with the lower cavity, an air inlet hole (301) is provided at the lower end of the valve rod (30), and the air inlet hole (301) is communicated with the air inlet channel (21).

3. The low-pressure automatic shut-off valve according to claim 1, characterized in that the upper end of the cylinder (10) is connected with an upper cylinder cover (13), and the lower end of the cylinder (10) is connected with a lower cylinder cover (14); the lower end of the valve body (20) is connected with a lower valve cover (24), the upper end of the valve body (20) is connected with an upper valve cover (23), and the upper valve cover (23) is connected with the lower cylinder cover (14).

4. A low-pressure automatic shut-off valve according to claim 3, characterized in that the upper cylinder cover (13) is connected with a pressure regulating rod (15) in a threaded manner, and the lower end of the pressure regulating rod (15) penetrates through the upper cylinder cover (13) to be connected with the top of the pressure regulating spring (12) for regulating the compression degree of the pressure regulating spring (12); the upper end of the pressure regulating rod (15) is provided with a locking nut (16), a cover cap (17) is arranged outside the locking nut (16), and the cover cap (17) is in threaded connection with the upper cylinder cover (13).

5. The low-pressure automatic shut-off valve according to claim 4, wherein the two ends of the pressure regulating rod (15) are provided with vent holes (151) in axial communication, so that the upper chamber of the cylinder (10) is in communication with the outside.

6. The low-pressure automatic shut-off valve according to claim 5, characterized in that a first sealing ring (18) is provided at both the connection of the cylinder (10) with the upper cylinder head (13) and the connection of the cylinder (10) with the lower cylinder head (14); a fastening screw (19) is connected between the upper cylinder cover (13) and the lower cylinder cover (14).

7. The low-pressure automatic shut-off valve according to claim 6, characterized in that the junction of the valve body (20) with the upper valve cap (23) and the junction of the valve body (20) with the lower valve cap (24) are both provided with a second sealing ring (25).

8. The low-pressure automatic shut-off valve according to claim 7, characterized in that the connection of the valve stem (30) with the lower cylinder head (14) and the connection of the valve stem (30) with the upper valve cap (23) are both provided with a third sealing ring (32).

9. The low-pressure automatic shut-off valve according to claim 1, characterized in that the side face of the piston (11) is also provided with a fourth sealing ring (111) in surrounding relation, said fourth sealing ring (111) being in abutment with the inner wall of the cylinder (10).

10. The low-pressure automatic shut-off valve according to claim 1, characterized in that a fifth sealing ring (311) is arranged at the junction of the valve flap (31) and the outlet channel (22).