CN115126913A - Safety cut-off valve with wide application conditions - Google Patents
Safety cut-off valve with wide application conditions Download PDFInfo
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- CN115126913A CN115126913A CN202210741918.6A CN202210741918A CN115126913A CN 115126913 A CN115126913 A CN 115126913A CN 202210741918 A CN202210741918 A CN 202210741918A CN 115126913 A CN115126913 A CN 115126913A
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- valve
- spring
- cut
- pressure
- bushing
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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
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/044—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with more than one spring
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Safety Valves (AREA)
Abstract
The invention particularly relates to the field of cut-off valves, and provides a cut-off valve with wide application conditions, which comprises an upper membrane cover (13), a lower membrane cover (14), a valve clack (2), a pull rod (5), a cut-off spring (3), a steel ball bushing (4), steel balls (6), a membrane (7), a membrane bushing (8), a steel ball bushing reset spring (9), a decompression adjusting spring (10), an overpressure adjusting spring (11) and a straight-through pipe joint (12), wherein the pull rod (5) is provided with a pull rod boss (501), the membrane bushing (8) is provided with a membrane bushing boss (801), and the effect of the cut-off valve is realized through the cooperation of the rolling of the steel balls (6) and a plurality of springs. The cut-off valve with wide application conditions has a novel structure, the spring force can not act on the steel balls all the time, the application range is wider, the cut-off valve can be used for low and high pressure working conditions, overpressure and decompression can be considered, and the cut-off valve has high sensitivity and reliability.
Description
Technical Field
The invention relates to the technical field of valves, in particular to the field of stop valves.
Background
The gas trip valve is a novel safety matching device of gas pipeline engineering, mainly used for the following occasions: when the pressure in the pipeline is monitored to be higher than or lower than the preset monitoring pressure value, the combustible gas in the pipeline is automatically cut off by the gas cut-off valve, so that the gas pressure in the pipeline is prevented from being continuously increased or the gas in the pipeline is prevented from being leaked in large quantities due to accidents to cause danger. The existing shut-off valve is single in structure, like the shut-off valve structure shown in patent CN201487227U, and is widely applied to a gas shut-off valve. Such structures have limited application, generally only below 50KPa, and cannot be applied to higher pressures. When the valve rod is cut off, the spring force always acts on the steel ball, the steel ball acts on the valve rod, if the pressure is high, the spring force is increased, the acting force between the steel ball and the valve rod is very large, the friction is increased, the valve rod cannot be moved and reset, the valve rod is easy to damage, and the failure rate is high. Therefore, a cut-off valve which is suitable for various pressure working conditions and has low failure rate needs to be designed.
Disclosure of Invention
In view of the above-mentioned shortcomings, the present invention aims to provide a shut valve with a new structure and a wide application range.
The invention solves the technical problems by the following technical means:
a kind of trip valve with wide applicable condition, including upper membrane cover, lower membrane cover, closing cap, valve clack, tie rod, characterized by, also include cutting off the spring, steel ball bush, steel ball, diaphragm, involucra bush, steel ball bush reset spring, decompression adjust the spring, overpressure adjust the spring, straight-through union coupling;
the pull rod is provided with a pull rod boss, and the leather membrane bushing is provided with a leather membrane bushing boss;
the pull rod is vertically arranged at the axis position of the cut-off valve, a cut-off spring is arranged at the front end of the pull rod, a steel ball bushing is arranged outside the pull rod, a hole is formed in the steel ball bushing and is used for placing a steel ball, the steel ball bushing is connected with a steel ball bushing reset spring and is arranged in the membrane bushing, a sealing ring is arranged in the right end of the membrane bushing and on the outer circumference of the pull rod and is used for effectively separating gas in a monitoring gas chamber from the outside, and the membrane is used for dividing a cut-off valve cavity into the monitoring gas chamber and an atmospheric pressure chamber and is connected with the membrane bushing into a whole;
a decompression adjusting spring is arranged outside the right end of the leather diaphragm lining, an overpressure adjusting spring is arranged between the decompression adjusting spring and the upper diaphragm cover, and the monitoring air chamber is communicated with the pipeline through the straight-through pipe joint; go up membrane lid tail end and pass through the closing cap closure, just go up the membrane lid with be provided with the sealing member between the closing cap, prevent effectively that outside steam from invading inside the part, play protection dampproofing effect.
Further, the decompression cut-off pressure of the decompression regulating spring is smaller than the overpressure cut-off pressure of the overpressure regulating spring.
Further, the reset pressure is between the decompression cut-off pressure of the decompression cut-off spring and the overpressure cut-off pressure of the overpressure regulating spring.
Further, the valve flap may be replaced with a striker.
Furthermore, the diaphragm is a double-wave type flexible pressure sensing element, so that the pressure sensing is more sensitive.
The cut-off valve of the invention has the following operation process:
when the pressure of the monitoring air chamber is between the overpressure cutoff pressure and the decompression cutoff pressure, the cutoff valve is in a hanging state.
And (3) an overpressure state process: the gas pipeline is communicated with the monitoring gas chamber through the straight-through pipe joint, when the gas pressure of the gas pipeline rises to be higher than the overpressure cut-off pressure, the gas pressure of the monitoring gas chamber rises synchronously to exceed the overpressure cut-off pressure, the diaphragm drives the leather diaphragm bush to move rightwards, the compression decompression adjusting spring and the overpressure adjusting spring are further pushed, the steel ball reaches the space on the left side of the boss of the leather diaphragm bush, an outward-pulled space is obtained, after the steel ball is pulled out, the pull rod moves leftwards under the action of the spring force of the cut-off spring, the pull rod boss crosses the steel ball, the pull rod is popped out leftwards, and the cut-off of the gas in the valve body is realized through the valve clack.
When the valve body is cut off, the air pressure in the gas pipe is reduced, the air pressure of the monitoring air chamber is synchronously reduced, the pressure is reduced to be between the overpressure cut-off pressure and the decompression cut-off pressure, and the rubber membrane lining returns to the hanging position under the action of the overpressure adjusting spring and the decompression adjusting spring.
The function of the pressure-loss adjusting spring is that when the pressure is lower than the pressure-loss cutting pressure, the leather diaphragm lining is pushed to the pressure-loss cutting position by the pressure-loss adjusting spring, the valve rod cannot be reset, the valve rod can be reset only when the pressure is increased between the overpressure cutting pressure and the pressure-loss cutting pressure, if the pressure-loss adjusting spring is eliminated, the limitation is not existed, and the valve rod can be reset only when the pressure is lower than the cutting pressure.
When the steel ball is separated, the pull rod passes through the steel ball, and then the steel ball is driven by the steel ball bushing to move leftwards under the action of a steel ball bushing reset spring, so that the pull rod is loosened, and the reset work after cutting is realized under the action of a cut spring.
And (3) a pressure loss state process: when the pressure of the monitoring air chamber is lower than the decompression cut-off pressure, the overpressure adjusting spring does not work, the decompression adjusting spring pushes the leather diaphragm lining to the left, the steel ball reaches the space on the right side of the boss of the leather diaphragm lining to obtain a space which is separated outwards, after the steel ball is separated, the pull rod moves to the left under the action of the spring force of the cut-off spring, the boss of the pull rod passes over the steel ball, the pull rod pops out to the left, and the fuel gas in the valve body is cut off through the valve clack.
According to the technical scheme, the pull rod cannot be subjected to unbalanced force in the lower membrane cover, and the cutting precision of the cut-off valve can be improved. When the cut-off pressure is very high, the spring force is also very high, but the structure cannot be influenced by the spring force, and the requirements of different working conditions can be met. The problem that the stop valve is suitable for both low and high pressure working conditions is solved, overpressure and decompression can be taken into consideration, the pressure sensitivity is higher, and the reliability is better.
The cut-off valve with wide application conditions has the advantages of novel structure, no constant action of spring force on steel balls, wider application range, simple structure, small volume, high sensitivity, reliable use and convenient maintenance, and can be used for cutting off gas, combustion-supporting air, cold air, flue gas and the like under low and high pressure working conditions and also under overpressure and decompression.
Drawings
FIG. 1 is a schematic structural view of a shut-off valve of the present invention in a normal hanging state;
FIG. 2 is a schematic structural diagram of the shut-off valve of the present invention installed inside a gas appliance;
FIG. 3 is a schematic view showing the details of the structure of the core part of the cut-off valve of the present invention;
FIG. 4 is a schematic structural view of the shut-off valve of the present invention in a shut-off state;
in the figure: the valve comprises a valve body 1, a valve clack 2, a cut-off spring 3, a steel ball bushing 4, a pull rod 5, a pull rod boss 501, a steel ball 6, a diaphragm 7, a diaphragm bushing 8, a diaphragm bushing boss 801, a steel ball bushing return spring 9, a decompression adjusting spring 10, an overpressure adjusting spring 11, a straight-through pipe joint 12, an upper diaphragm cover 13, a lower diaphragm cover 14, a sealing cover 15, a sealing piece 16 and a sealing ring 17.
Detailed Description
The following description of the embodiments of the present invention is provided by way of specific examples, and those skilled in the art will appreciate the advantages and utilities of the present invention from the disclosure herein. It should be noted that the drawings provided in the following embodiments are for illustrative purposes only, are schematic drawings rather than actual drawings, and should not be construed as limiting the present invention, and in order to better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the drawings, it is merely for convenience of description and simplicity of description, but does not indicate or imply that the indicated device or element must have a specific orientation, be constructed in a specific orientation, and be operated, therefore, the terms describing the positional relationships in the drawings are only used for illustrative purposes and are not to be construed as limiting the present invention, and those skilled in the art can understand the specific meanings for the above applications according to specific situations.
Examples
As shown in fig. 1, 2, 3 and 4, the core technical scheme of the invention is that bosses are arranged on a pull rod 5 and a membrane bushing 8, and then the action of a cut-off valve is realized through the cooperation of a plurality of springs in rolling fit of a steel ball 6.
The shut-off valve is connected with the valve body 1 through a bolt, as shown in fig. 2, the upper membrane cover 13 and the lower membrane cover 14 are connected into a whole through a bolt, and the valve is internally provided with a valve clack 2, a pull rod 5, a shut-off spring 3, a steel ball bushing 4, a steel ball 6, a diaphragm 7, a membrane bushing 8, a steel ball bushing return spring 9, a decompression adjusting spring 10 and an overpressure adjusting spring 11.
The pull rod 5 is provided with a pull rod boss 501, and the leather membrane bushing 8 is provided with a leather membrane bushing boss 801;
the pull rod 5 is vertically arranged at the axis position of the cut-off valve, the front end of the pull rod is provided with a cut-off spring 3, the outer part of the pull rod is provided with a steel ball bushing 4, a hole is formed in the steel ball bushing 4, the steel ball bushing 4 is connected with a steel ball bushing reset spring 9 and is arranged in the membrane bushing 8, a sealing ring 17 is arranged in the right end of the membrane bushing 8 and on the outer circumference of the pull rod 5 to effectively separate gas in the monitoring gas chamber from the outside, and the membrane 7 divides the cavity of the cut-off valve into the monitoring gas chamber and an atmospheric pressure chamber which are connected with the membrane bushing 8 into a whole;
a decompression adjusting spring 10 is arranged outside the right end of the leather diaphragm bush 8, an overpressure adjusting spring 11 is arranged between the decompression adjusting spring 10 and an upper diaphragm cover 13, and a straight-through pipe joint 12 is used for communicating the monitoring air chamber with the pipeline. Go up membrane lid 13 tail end and pass through closing cap 15 closed, and go up and be provided with sealing member 16 between membrane lid 13 and the closing cap 15, prevent effectively that outside steam from invading inside the part, play the protection dampproofing.
In the embodiment, the overpressure cut-off pressure is 50KPa, and the decompression cut-off pressure is 40KPa as an example, the operation process of the cut-off valve is as follows:
when the pressure of the monitoring air chamber is between 40Kpa and 50Kpa, the shut-off valve is in a hanging state, as shown in figure 1, the detailed internal structure is shown in figure 3, and hatching lines are omitted in figure 3 for better expressing the position relation of the steel ball and other components.
And (3) an overpressure state process: the gas pipeline is communicated with a monitoring gas chamber through a straight-through pipe joint 12, when the gas pressure of the gas pipeline rises to be greater than 50Kpa, the gas pressure of the monitoring gas chamber rises to exceed 50Kpa synchronously, a diaphragm 7 drives a membrane bushing 8 to move rightwards, a compression decompression adjusting spring 10 and an overpressure adjusting spring 11 are further pushed, a steel ball 6 reaches the left space of a boss 801 of the membrane bushing to obtain a space which is pulled out outwards, after the steel ball 6 is pulled out, a pull rod 5 moves leftwards under the action of a spring force of a cutting spring 3, the pull rod boss 501 passes over the steel ball 6, the pull rod 5 is ejected leftwards, and the cutting of the gas in a valve body 1 is realized through a valve clack 2.
When the valve body 1 is cut off, the air pressure in the gas pipe is reduced, the air pressure of the monitoring air chamber is synchronously reduced, the pressure is reduced to 40Kpa-50Kpa, and the film bushing 8 returns to the hanging position under the action of the overpressure adjusting spring 11 and the decompression adjusting spring 10.
The function of the pressure-loss adjusting spring 10 is that when the pressure is lower than 40Kpa, the film bushing 8 is pushed to the pressure-loss cutting position by the pressure-loss adjusting spring 10, the valve rod cannot be reset, the valve rod can be reset only when the pressure is increased to 40Kpa-50Kpa, and if the pressure-loss adjusting spring 10 is eliminated, the valve rod can be reset only when the pressure is lower than the cutting pressure without limitation.
When the reset is needed, the pull rod 5 is pulled to move rightwards, the pull rod boss 501 on the pull rod 5 drives the steel ball 6 and the steel ball bushing 4 to move rightwards, the steel ball 6 obtains an outward-disengaging space when moving for a certain distance, after the steel ball 6 disengages, the pull rod 5 passes over the steel ball 6, then the steel ball bushing 4 drives the steel ball 6 to move leftwards under the action of the steel ball bushing reset spring 9, so far, the pull rod 5 is loosened, and the reset work after the cut-off is realized under the action of the cut-off spring 3.
And (3) a pressure loss state process: when the pressure of the monitored air chamber is lower than 40Kpa, the overpressure adjusting spring 11 does not work, the no-pressure adjusting spring 10 pushes the leather diaphragm bushing 8 to the left, the steel ball 6 reaches the right space of the leather diaphragm bushing boss 801 to obtain a space which is pulled out outwards, after the steel ball 6 is pulled out, the pull rod 5 moves to the left under the action of the spring force of the cut-off spring 3, the pull rod boss 501 crosses the steel ball 6, the pull rod 5 is popped out to the left, and the fuel gas in the valve body 1 is cut off through the valve clack 2.
According to the technical scheme, the pull rod 5 cannot be subjected to unbalanced force in the lower membrane cover 14, and the cutting precision of the cut-off valve can be improved. When the cut-off pressure is very high, the spring force is also very high, but the structure cannot be influenced by the spring force, and the requirements of different working conditions can be met. The problem that the stop valve is suitable for both low and high pressure working conditions is solved, overpressure and decompression can be taken into consideration, pressure sensing is more sensitive, and reliability is better.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A safety cut-off valve with wide application conditions comprises an upper membrane cover (13), a lower membrane cover (14), a sealing cover (15), a valve clack (2) and a pull rod (5), and is characterized by further comprising a cut-off spring (3), a steel ball bushing (4), a steel ball (6), a diaphragm (7), a membrane bushing (8), a steel ball bushing reset spring (9), a decompression adjusting spring (10), an overpressure adjusting spring (11) and a straight-through pipe joint (12);
the pull rod (5) is provided with a pull rod boss (501), and the leather diaphragm bush (8) is provided with a leather diaphragm bush boss (801);
the pull rod (5) is vertically arranged at the axis position of the cut-off valve, the cut-off spring (3) is arranged at the front end of the pull rod, a steel ball bushing (4) is arranged outside the pull rod, a hole is formed in the steel ball bushing (4) and used for placing a steel ball (6), the steel ball bushing is connected with a steel ball bushing reset spring (9) and is arranged in the leather membrane bushing (8), a sealing ring (17) is arranged in the right end of the leather membrane bushing (8) and on the outer circumference of the pull rod (5) and used for effectively separating gas in a monitoring gas chamber from the outside, and the diaphragm (7) divides a cut-off valve cavity into the monitoring gas chamber and an atmospheric pressure chamber and is connected with the leather membrane bushing (8) into a whole;
a decompression adjusting spring (10) is arranged outside the right end of the leather diaphragm lining (8), an overpressure adjusting spring (11) is arranged between the decompression adjusting spring (10) and the upper diaphragm cover (13), and the monitoring air chamber is communicated with the pipeline through a straight-through pipe joint (12); the tail end of the upper film cover (13) is closed through a sealing cover (15), and a sealing piece (16) is arranged between the upper film cover (13) and the sealing cover (15), so that external water vapor is effectively prevented from invading the interior of the part, and the moisture-proof effect is achieved.
2. A wide range of applicable safety shut-off valves according to claim 1, characterized in that the pressure relief shut-off pressure of the pressure relief adjustment spring (10) is lower than the overpressure shut-off pressure of the overpressure adjustment spring (11).
3. A safety shut-off valve according to claim 2, characterised in that the return pressure falls between the pressure relief shut-off pressure of the pressure relief shut-off spring (10) and the overpressure shut-off pressure of the overpressure adjustment spring (11), and the diaphragm sleeve (8) returns to the hanging position under the action of the overpressure adjustment spring (11) and the pressure relief adjustment spring (10).
4. A wide range of applicable safety shut-off valves as claimed in claim 1, wherein the valve flap (2) is replaceable with a striker.
5. A wide range of applicable safety shut-off valves according to claim 1, characterised in that said diaphragm (7) is a double-wave type flexible pressure sensing element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210741918.6A CN115126913A (en) | 2022-06-27 | 2022-06-27 | Safety cut-off valve with wide application conditions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210741918.6A CN115126913A (en) | 2022-06-27 | 2022-06-27 | Safety cut-off valve with wide application conditions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115126913A true CN115126913A (en) | 2022-09-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210741918.6A Pending CN115126913A (en) | 2022-06-27 | 2022-06-27 | Safety cut-off valve with wide application conditions |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115126913A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115614520A (en) * | 2022-12-19 | 2023-01-17 | 常州市潞城燃气设备股份有限公司 | Automatic bleeding valve |
-
2022
- 2022-06-27 CN CN202210741918.6A patent/CN115126913A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115614520A (en) * | 2022-12-19 | 2023-01-17 | 常州市潞城燃气设备股份有限公司 | Automatic bleeding valve |
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