CN114198552A - Self-operated safety cut-off valve with pneumatic reset of axial flow structure - Google Patents
Self-operated safety cut-off valve with pneumatic reset of axial flow structure Download PDFInfo
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- CN114198552A CN114198552A CN202111609880.9A CN202111609880A CN114198552A CN 114198552 A CN114198552 A CN 114198552A CN 202111609880 A CN202111609880 A CN 202111609880A CN 114198552 A CN114198552 A CN 114198552A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/20—Excess-flow valves
- F16K17/22—Excess-flow valves actuated by the difference of pressure between two places in the flow line
- F16K17/32—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting on a servo-mechanism or on a catch-releasing mechanism
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mechanically-Actuated Valves (AREA)
Abstract
The invention discloses a self-operated safety cut-off valve for pneumatic resetting of an axial flow structure, which comprises a valve main body; the pneumatic reset mechanism is used for realizing quick opening of the valve main body and is connected with a self-operated controller used for controlling the valve main body to be automatically closed. The valve has reasonable structural design, realizes quick and stable reset of the valve without external force and the need of balancing the pressure in front of and behind the valve, simultaneously realizes quick and automatic cut-off of the valve, and realizes efficient sealing of the valve.
Description
Technical Field
The invention relates to the technical field of valves, in particular to a self-operated safety shut-off valve with an axial flow structure and a pneumatic reset function.
Background
The safety shut-off valve applied to natural gas high-pressure occasions in the past mainly has the following two driving modes:
the first is a turning plate type structure, represented by 711 series of German RMG company, which uses a hook to hang a turning plate, when the feedback air pressure reaches a set value, the hook falls off, the turning plate falls down to play a sealing role, thereby realizing the cutting off, has the advantages of self-operated, does not need any external power source, utilizes the pressure of the pipeline to adjust automatically, can be used in unattended stations, has rapid action, simple structure and short reset time, has the defects that the turnover plate blocks the instantaneous movement of medium flow due to the rapid falling of the turnover plate, can generate water hammer action, and the vibration caused by the water hammer phenomenon influences the safety of the pipeline instrument equipment, and the valve can be reset and opened after the valve is cut off and the pressure in front of and behind the balance valve is needed, the pressure balancing time is long, in addition, because the valve flap is also heavier, the valve bore is generally DN300 at most, and the pressure is generally CL600, and is difficult to reset once more. The other is an axial flow structure represented by Holland MOKVELD and Ningxia Aikefu, the valve body adopts a valve body of an electric axial flow valve, the valve body is a pure axial flow structure, a spring return type hydraulic actuating mechanism is adopted to drive the valve, the valve is fully opened under normal conditions, hydraulic thrust props against a spring in a cylinder to realize the full opening of the valve, when the pressure behind the valve is overpressure, a pressure transmitter transmits a signal to a central control chamber, the central control chamber gives a signal to an electromagnetic valve of a hydraulic system, the electromagnetic valve is reversed, a lower cavity of the spring is hydraulically exhausted, and the valve is closed under the action of the spring.
Disclosure of Invention
The invention aims to provide a self-operated safety cut-off valve with an axial flow structure for pneumatic resetting, which can realize quick and stable resetting of a valve, quick and automatic cutting of the valve and efficient sealing of the valve under the conditions of no need of external force and no need of balancing pressure before and after the valve.
The invention is realized by the following steps:
a self-operated safety cut-off valve with an axial flow structure and a pneumatic reset function comprises a valve main body; the pneumatic reset mechanism is used for realizing quick opening of the valve main body and is connected with a self-operated controller used for controlling the valve main body to be automatically closed.
The valve main body comprises a pure axial flow valve body, a stop sleeve is installed at the outlet end of the inner side wall of the pure axial flow valve body, a valve core assembly matched with the stop sleeve is movably installed in the pure axial flow valve body, one end, close to the valve core assembly, of the stop sleeve is abutted to a sleeve, the valve core assembly is connected with a valve rod, the valve rod is installed in the pure axial flow valve body in a threaded mode, and a sealing spring is arranged between the valve core assembly and the pure axial flow valve body.
The pneumatic reset mechanism comprises an air cylinder arranged at the top end of the outer portion of the pure axial flow valve body, a connecting shaft is arranged in the air cylinder in a vertically sliding mode, a piston for driving the connecting shaft to move upwards is arranged in the air cylinder, the bottom end of the connecting shaft is connected with a push rod, the push rod is connected with the pure axial flow valve body in a sliding mode, the lower end of the push rod is meshed with the valve rod, cavity openings are formed in the upper end and the lower end of the side wall of the air cylinder, and the top end of the connecting shaft is connected with the control end of the self-operated controller.
And a T-shaped floating sealing structure is arranged between the stop sleeve and the sleeve.
And the matching surfaces between the stop sleeve and the valve core assembly are all provided with inclined surfaces.
And an O-shaped ring is embedded and installed on the matching surface of the valve core assembly and the stop sleeve.
The self-operated controller comprises a control box installed at the top of a cylinder, a shifting fork type collision mechanism used for locking a connecting shaft is installed in the control box, a commander component is installed on the control box, and the output end of the commander component is connected with a feedback rod used for controlling the shifting fork type collision mechanism to unlock the connecting shaft.
Through the technical scheme, the invention at least has the following beneficial effects:
(1) the valve adopts a pure axial flow type structure and a streamline design, the medium does not generate turbulent flow when moving in the valve body, and meanwhile, the valve adopts a self-operated design, does not need any external power source and can automatically adjust, cut and close by utilizing the pressure of a pipeline;
(2) the self-operated controller can sensitively sense the change of pressure by adopting a shifting fork collision mechanism, thereby quickly and flexibly releasing the push rod and ensuring that the valve body is quickly and stably cut off and closed.
(3) The invention adopts the pressure balance design, and can design the caliber and the pressure of the valve to be larger;
(4) the sealing spring is arranged in the valve body, so that the force dispersion caused by the fact that the spring is arranged outside the valve body is avoided;
(5) the pneumatic quick reset device realizes pneumatic quick reset by using the air cylinder, does not need to balance the pressure of the front valve and the rear valve of the valve during reset, and has the advantages of quickness and labor saving;
(6) the valve disclosed by the invention is sealed in a three-section sealing mode, and the sealing property is good.
Drawings
FIG. 1 is a schematic view of a self-operated safety shut-off valve with an axial flow structure pneumatically reset according to the present invention in an open state;
fig. 2 is a schematic diagram of the self-operated safety shut-off valve with the axial flow structure pneumatically reset in a closed state.
FIG. 3 is a schematic view of a self-operated controller in the pneumatic reset self-operated safety shut-off valve with an axial flow structure when the valve body is in an open state;
FIG. 4 is a schematic view of a self-operated controller in a pneumatic reset self-operated safety shut-off valve with an axial flow structure according to the present invention when the valve body is in a closed state;
FIG. 5 is an enlarged view of the structure of FIG. 1 at A according to the present invention.
In the figure, 1, a valve body; 2. a pneumatic reset mechanism; 3. a self-operated controller; 11. a pure axial flow valve body; 12. a stop sleeve; 13. a valve core assembly; 14. a valve stem; 15. a T-shaped floating sealing structure; 16. an O-shaped ring; 17. a seal spring; 18. a sleeve; 21. a cylinder; 22. a connecting shaft; 23. a push rod; 24. a lumen port; 25. a piston; 31. a control box; 32. a director component; 33. a feedback lever; 34. a crank; 35. a deflector rod; 36. a cross-shaped connecting rod; 37. a balance bar.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to fig. 1 to 5, an embodiment of the present invention provides a self-operated safety shut-off valve with an axial flow structure for pneumatic resetting, including a valve main body 1; the valve is characterized in that a pneumatic reset mechanism 2 for realizing quick opening of the valve body 1 is installed on the valve body 1, and the pneumatic reset mechanism 2 is connected with a self-operated controller 3 for controlling the valve body 1 to be automatically closed.
The valve body 1 comprises a pure axial flow valve body 11, a stop sleeve 12 is installed at the outlet end of the inner side wall of the pure axial flow valve body 11, a valve core assembly 13 matched with the stop sleeve 12 is movably installed in the pure axial flow valve body 11, a sleeve 18 is abutted to one end, close to the valve core assembly 13, of the stop sleeve 12, the stop sleeve 12 is screwed into the pure axial flow valve body 11 through threads to press the sleeve 18, so that the position of the sleeve 18 is fixed, the valve core assembly 13 is connected with a valve rod 14, the valve rod 14 is installed in the pure axial flow valve body 11 through threads, and a sealing spring 17 is arranged between the valve core assembly 13 and the pure axial flow valve body 11. In this embodiment, the valve core assembly 13 can be driven to approach or leave the stop sleeve 12 by driving the valve rod 14, so as to close and open the valve body 1, and the sealing spring 17 is arranged to provide a certain driving force for closing the valve body 1.
The pneumatic reset mechanism 2 comprises a cylinder 21 arranged at the top end of the outer portion of the pure axial flow valve body 11, a connecting shaft 22 is arranged in the cylinder 21 in a vertically sliding mode, a piston 25 for driving the connecting shaft 22 to move upwards is arranged in the cylinder 21, a push rod 23 is connected to the bottom end of the connecting shaft 22, the push rod 23 is connected with the pure axial flow valve body 11 in a sliding mode, the lower end of the push rod 23 is meshed with the valve rod 14, cavity openings 24 are formed in the upper end and the lower end of the side wall of the cylinder 21, and the top end of the connecting shaft 22 is connected with the control end of the self-operated controller 3. In this embodiment, natural gas is introduced from the cavity opening 24 at the lower end of the side wall of the cylinder 21, so as to drive the piston 25 to move upwards, the piston 25 abuts against the top end of the connecting shaft 22 to drive the valve rod 14 to transmit, and thus the valve core assembly 13 is driven to be away from the stop sleeve 12, and the valve body 1 is opened.
A T-shaped floating sealing structure 15 is arranged between the stop sleeve 12 and the sleeve 18. In the present embodiment, the T-shaped floating seal structure 15 is provided to form a radial floating seal between the stop sleeve 12 and the sleeve 18.
The matching surfaces between the stop sleeve 12 and the valve core assembly 13 are all arranged as inclined surfaces. In this embodiment, the mating surfaces between the stop sleeve 12 and the valve core assembly 13 are both provided as inclined surfaces, so that a hard seal can be formed when the stop sleeve 12 and the valve core assembly 13 are mated.
An O-shaped ring 16 is embedded and mounted on the matching surface of the valve core assembly 13 and the stop sleeve 12. In this embodiment, a face seal is formed between the stop sleeve 12 and the spool assembly 13.
Self-operated controller 3 is including installing the control box 31 at cylinder 21 top, install in the control box 31 and be used for carrying out the fork formula collision mechanism of locking to connecting axle 22, just install commander subassembly 32 on the control box 31, commander subassembly 32 output is connected with and is used for controlling the feedback pole 33 of fork formula collision mechanism in order to realize the unblock of connecting axle 22. In this embodiment, referring to fig. 3 and 4 in combination, the shifting fork type collision mechanism is composed of a crank 34, a shift lever 35, a cross connecting rod 36 and a balance rod 37, during the rising process of the connecting shaft 22, the crank 34 is pushed to touch the shift lever 35, at this time, a notch on the crank 34 is engaged with a notch on the shift lever 35, the connecting shaft 22 is locked, the commander assembly 32 receives the feedback pressure after the pressure regulating valve, when the feedback pressure value after the pressure regulating valve reaches a set cut-off value, the feedback rod 33 is pushed to move forward until touching the cross connecting rod 36, the cross connecting rod 36 is twisted clockwise to disengage the balance rod 37, the balance rod 37 is twisted under the spring force to touch the shift lever 35, the shift lever 35 is raised counterclockwise, at this time, a hook of the crank 34 is disengaged from the shift lever 35 (this is really a double-shift jack), the spool assembly 13 moves to the right rapidly under the action of gravity and the spring force, until the seal of the valve core assembly 13 is contacted with the stop sleeve 12 to realize sealing, at the moment, the safety shut-off valve realizes quick cut-off sealing.
The following provides a further explanation of the principles of use of the present invention.
The valve main body 1 introduces the valve back pressure of the valve main body 1 back pressure regulating valve into the cylinder 21 through the air pipe and the pressure reducing valve in a closed state (in a cut-off state), the valve back pressure enters the lower cavity of the cylinder 21 through the cavity opening 24 at the lower end of the side wall of the cylinder 21, the piston 25 in the cylinder 21 drives the connecting shaft 22 to move upwards under the pushing of natural gas, the connecting shaft 22 drives the push rod 23 connected with the connecting shaft to move upwards, the push rod 23 moves upwards to drive the valve rod 14 meshed with the push rod at 45 degrees to move leftwards, and the valve rod 14 drives the valve core assembly 13 connected with the valve rod to move leftwards against the force of the sealing spring 17, so that the valve main body 1 is opened. The piston 25 is pushed by the natural gas to move upwards all the time, the connecting shaft 22 rises, the crank 34 is pushed to touch the shifting rod 35, and at the moment, the notch on the crank 34 is meshed with the notch on the shifting rod 35, so that the connecting shaft 22 is locked, and the valve body 1 is completely opened, as shown in fig. 1. At this time, the gas in the lower chamber of the cylinder 21 is discharged, the natural gas is introduced into the upper chamber of the cylinder 21 from the chamber opening 24 in the upper end of the side wall of the cylinder 21, and the piston 25 moves to the bottom of the cylinder 21 under the pressure of the natural gas, so as to prevent the connecting shaft 22 from rapidly touching the piston 25 to cause rigid collision when the valve body 1 is cut off.
The commander component 32 receives the feedback pressure after the pressure regulating valve, when the feedback pressure value after the pressure regulating valve reaches a set cut-off value, the feedback rod 33 is pushed to move forwards until the feedback rod touches the cross connecting rod 36, the cross connecting rod 36 is twisted clockwise to be separated from the balance rod 37, the balance rod 37 is twisted to touch the shift rod 35 under the action of spring force, the shift rod 35 lifts anticlockwise, at the moment, the hook of the crank 34 is separated from the shift rod 35 (the one is really a two-shift jack), the unlocking of the connecting shaft 22 is realized, the valve core component 13 moves rightwards rapidly under the action of gravity and the sealing spring 17 until the valve core component 13 is contacted with the stop sleeve 12 to realize sealing, and at the moment, the valve body 1 realizes rapid cut-off sealing, as shown in fig. 2. When the valve body 1 is in a sealing state, the T-shaped floating sealing structure 15 is in contact with the side wall of the sleeve 18 to form a first floating seal, so that large pressure can be sealed, a second end face seal is formed between the O-shaped ring 16 and the end face of the stop sleeve 12, middle and low pressure gas can be sealed, a third metal hard seal is formed between the end face of the valve core assembly 13 and the end face of the stop sleeve 12, and once the two seals fail in case of pipeline fire, the third seal can also play a role.
In summary, compared with the prior art, the invention has the following advantages:
(1) the valve adopts a pure axial flow type structure and a streamline design, the medium does not generate turbulent flow when moving in the valve body, and meanwhile, the valve adopts a self-operated design, does not need any external power source and can automatically adjust, cut and close by utilizing the pressure of a pipeline;
(2) the self-operated controller can sensitively sense the change of pressure by adopting a shifting fork collision mechanism, thereby quickly and flexibly releasing the push rod and ensuring that the valve body is quickly and stably cut off and closed.
(3) The invention adopts the pressure balance design, and can design the caliber and the pressure of the valve to be larger;
(4) the sealing spring is arranged in the valve body, so that the force dispersion caused by the fact that the spring is arranged outside the valve body is avoided;
(5) the pneumatic quick reset device realizes pneumatic quick reset by using the air cylinder, does not need to balance the pressure of the front valve and the rear valve of the valve during reset, and has the advantages of quickness and labor saving;
(6) the valve disclosed by the invention is sealed in a three-section sealing mode, and the sealing property is good.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A self-operated safety cut-off valve for pneumatic reset of an axial flow structure comprises a valve main body (1);
the method is characterized in that: the automatic opening and closing valve is characterized in that a pneumatic reset mechanism (2) used for realizing quick opening of the valve main body (1) is installed on the valve main body (1), and the pneumatic reset mechanism (2) is connected with a self-operated controller (3) used for controlling the valve main body (1) to be automatically closed.
2. The self-operated safety shut-off valve for pneumatic resetting of axial flow structure according to claim 1, which is characterized in that: the valve main body (1) comprises a pure axial flow valve body (11), a stop sleeve (12) is installed at the outlet end of the inner side wall of the pure axial flow valve body (11), a valve core assembly (13) matched with the stop sleeve (12) is movably installed in the pure axial flow valve body (11), the stop sleeve (12) is close to one end of the valve core assembly (13) and is abutted to a sleeve (18), the valve core assembly (13) is connected with a valve rod (14), the valve rod (14) is installed in the pure axial flow valve body (11) in a threaded mode, and a sealing spring (17) is arranged between the valve core assembly (13) and the pure axial flow valve body (11).
3. The self-operated safety shut-off valve for pneumatic resetting of axial flow structure as claimed in claim 2, wherein: pneumatic canceling release mechanical system (2) is including installing cylinder (21) on pure axial flow valve body (11) outside top, slidable mounting has connecting axle (22) from top to bottom in cylinder (21), just be provided with the drive in cylinder (21) connecting axle (22) upward movement's piston (25), connecting axle (22) bottom is connected with push rod (23), push rod (23) with pure axial flow valve body (11) sliding connection, just push rod (23) lower extreme with valve rod (14) meshing, the lower extreme all is provided with accent (24) on cylinder (21) lateral wall, connecting axle (22) top with self-operated controller (3) control end is connected.
4. The self-operated safety shut-off valve for pneumatic resetting of axial flow structure as claimed in claim 2, wherein: and a T-shaped floating sealing structure (15) is arranged between the stop sleeve (12) and the sleeve (18).
5. The self-operated safety shut-off valve for pneumatic resetting of axial flow structure as claimed in claim 2, wherein: and matching surfaces between the stop sleeve (12) and the valve core assembly (13) are both provided with inclined surfaces.
6. The self-operated safety shut-off valve for pneumatic resetting of axial flow structure as claimed in claim 2, wherein: and an O-shaped ring (16) is embedded and installed on the matching surface of the valve core assembly (13) and the stop sleeve (12).
7. The self-operated safety shut-off valve with the axial flow structure pneumatically reset according to claim 2, wherein the self-operated controller (3) comprises a control box (31) installed at the top of the cylinder (21), a shifting fork type collision mechanism used for locking the connecting shaft (22) is installed in the control box (31), a commander assembly (32) is installed on the control box (31), and the output end of the commander assembly (32) is connected with a feedback rod (33) used for controlling the shifting fork type collision mechanism to unlock the connecting shaft (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111609880.9A CN114198552A (en) | 2021-12-27 | 2021-12-27 | Self-operated safety cut-off valve with pneumatic reset of axial flow structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111609880.9A CN114198552A (en) | 2021-12-27 | 2021-12-27 | Self-operated safety cut-off valve with pneumatic reset of axial flow structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114198552A true CN114198552A (en) | 2022-03-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111609880.9A Pending CN114198552A (en) | 2021-12-27 | 2021-12-27 | Self-operated safety cut-off valve with pneumatic reset of axial flow structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114198552A (en) |
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2021
- 2021-12-27 CN CN202111609880.9A patent/CN114198552A/en active Pending
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