A widely applicable safety shut-off valve

Abstract

The application relates to the field of cut-off valves, and provides a widely applicable cut-off valve which comprises an upper diaphragm cover (13), a lower diaphragm cover (14), a valve clack (2), a pull rod (5), a cut-off spring (3), a steel ball bushing (4), a steel ball (6), a diaphragm (7), a leather diaphragm bushing (8), a steel ball bushing reset spring (9), a pressure loss 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), the leather diaphragm bushing (8) is provided with a leather diaphragm bushing boss (801), the steel ball (6) is rolled and matched with multiple springs to realize the function of the cut-off valve. The widely applicable cut-off valve has a novel structure, the spring force does not always act on the steel ball, the application range is wider, the cut-off valve can be used in low and high pressure working conditions, can also consider overpressure and pressure loss, and has high sensitivity and reliability.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and more specifically to the field of shut-off valves. Background Technology

[0002] A gas shut-off valve is a new type of safety device for gas pipeline projects, mainly used in the following situations: when the pressure in the pipeline exceeds or falls below a preset monitoring pressure value, the gas shut-off valve automatically cuts off the combustible gas in the pipeline to prevent the gas pressure from continuing to increase or to prevent accidental large-scale gas leakage that could lead to danger. Existing shut-off valves have a simple structure, such as the shut-off valve structure shown in patent CN201487227U, which is widely used in gas shut-off valves. This type of structure has limited application conditions, generally only applicable to pressures below 50 kPa, and cannot be used at higher pressures. After shut-off, the spring force continues to act on the steel ball, which in turn acts on the valve stem. If the pressure is high, the spring force increases, resulting in a very large force between the steel ball and the valve stem, leading to increased friction, making it impossible for the valve stem to move or reset, easily causing damage, and resulting in a high failure rate. Therefore, it is necessary to design a shut-off valve that is adaptable to various pressure conditions and has a low failure rate. Summary of the Invention

[0003] To address the aforementioned shortcomings, the present invention aims to provide a novel shut-off valve with a wide range of applicable conditions.

[0004] The present invention solves the above-mentioned technical problems through the following technical means:

[0005] A widely applicable shut-off valve includes an upper diaphragm cover, a lower diaphragm cover, a sealing cover, a valve disc, and a pull rod. Its distinguishing feature is that it further includes a shut-off spring, a steel ball bushing, a steel ball, a diaphragm, a diaphragm bushing, a steel ball bushing return spring, a pressure-reducing spring, an overpressure-reducing spring, and a straight-through pipe joint.

[0006] The pull rod is provided with a pull rod boss, and the membrane bushing is provided with a membrane bushing boss;

[0007] The pull rod is vertically arranged at the axis of the shut-off valve, with a shut-off spring at the front end and a steel ball bushing on the outside. The steel ball bushing has holes to hold steel balls and is connected to the steel ball bushing return spring. It is placed inside the diaphragm bushing. A sealing ring is provided on the right end of the diaphragm bushing and the outer circumference of the pull rod to effectively isolate the gas in the monitoring chamber from the outside. The diaphragm divides the shut-off valve cavity into a monitoring chamber and an atmospheric pressure chamber and is integrated with the diaphragm bushing.

[0008] A pressure relief adjustment spring is provided on the outside of the right end of the diaphragm bushing, and an overpressure adjustment spring is provided between the pressure relief adjustment spring and the upper diaphragm cover. The straight pipe connector connects the monitoring gas chamber to the pipeline. The tail end of the upper diaphragm cover is closed by a sealing cap, and a sealing element is provided between the upper diaphragm cover and the sealing cap to effectively prevent external moisture from entering the interior of the parts and play a protective and moisture-proof role.

[0009] Furthermore, the underpressure cut-off pressure of the underpressure regulating spring is less than the overpressure cut-off pressure of the overpressure regulating spring.

[0010] Furthermore, the reset pressure is between the underpressure cut-off pressure of the underpressure regulating spring and the overpressure cut-off pressure of the overpressure regulating spring.

[0011] Furthermore, the valve disc can be replaced with a striking pin.

[0012] Furthermore, the diaphragm is a dual-wavelength flexible pressure-sensing element, which is more sensitive to pressure.

[0013] The operation process of the shut-off valve of this invention is as follows:

[0014] When the pressure in the monitoring chamber is between the overpressure cutoff pressure and the underpressure cutoff pressure, the shut-off valve is in the suspended state.

[0015] Overpressure process: The gas pipeline is connected to the monitoring chamber through a straight pipe joint. When the gas pressure in the gas pipeline rises above the overpressure cutoff pressure, the gas pressure in the monitoring chamber rises synchronously above the overpressure cutoff pressure. The diaphragm drives the diaphragm bushing to move to the right, which in turn pushes the compression pressure relief adjustment spring and the overpressure adjustment spring. The steel ball reaches the space to the left of the diaphragm bushing boss, gaining space to detach outward. After the steel ball detaches, the pull rod moves to the left under the action of the cutoff spring force. The pull rod boss passes the steel ball, and the pull rod pops out to the left, cutting off the gas in the valve body through the valve disc.

[0016] When the valve body is shut off, the gas pressure in the gas pipe decreases, and the gas pressure in the monitoring chamber decreases synchronously. When the pressure drops to between the overpressure cutoff pressure and the underpressure cutoff pressure, the diaphragm bushing returns to the suspended position under the action of the overpressure adjustment spring and the underpressure adjustment spring.

[0017] The function of the pressure relief spring is that when the pressure is lower than the pressure relief cut-off pressure, the diaphragm bushing is pushed to the pressure relief cut-off position by the pressure relief spring, and the valve stem cannot be reset. It can only be reset when the pressure increases to between the overpressure cut-off pressure and the pressure relief cut-off pressure. If the pressure relief spring is removed, there is no such restriction, and it can be reset as long as the pressure is lower than the cut-off pressure.

[0018] When reset is required, pull the lever to the right. The lever boss drives the steel ball and steel ball bushing to move to the right. After moving a certain distance, the steel ball gains space to dislodge. After the steel ball dislodges, the lever passes over the steel ball. Then, the steel ball bushing drives the steel ball to move to the left under the action of the steel ball bushing reset spring. At this point, release the lever. Under the action of the cutting spring, the reset work after cutting is achieved.

[0019] Depressurization process: When the pressure in the monitoring chamber is lower than the depressurization cutoff pressure, the overpressure regulating spring does not function, and the depressurization regulating spring pushes the diaphragm bushing to the left. The steel ball reaches the space on the right side of the diaphragm bushing boss, gaining space to detach outward. After the steel ball detaches, the pull rod moves to the left under the action of the cutoff spring force. The pull rod boss passes over the steel ball, and the pull rod pops out to the left and cuts off the gas in the valve body through the valve disc.

[0020] This technical solution ensures that the pull rod is not subjected to unbalanced forces inside the lower diaphragm cover, thus improving the shut-off accuracy of the shut-off valve. While high shut-off pressure implies high spring force, this structure is unaffected by this force, meeting the needs of various operating conditions. It solves the problem of the shut-off valve being suitable for both low and high pressure conditions, while also handling overpressure and underpressure situations, resulting in more sensitive pressure sensing and better reliability.

[0021] This invention provides a widely applicable shut-off valve with a novel structure. The spring force does not continuously act on the steel ball, making it suitable for a wider range of applications. It can be used not only in low and high pressure conditions but also in overpressure and underpressure conditions. It has a simple structure and can be used to shut off coal gas, combustion air, cold air, and flue gas. It is small in size, highly sensitive, reliable in use, and easy to maintain. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the shut-off valve of the present invention in its normal suspended state;

[0023] Figure 2 This is a schematic diagram of the structure of the shut-off valve of the present invention installed inside a gas appliance;

[0024] Figure 3 This is a schematic diagram showing the structural details of the core component of the shut-off valve of the present invention;

[0025] Figure 4 This is a schematic diagram of the structure of the shut-off valve in the shut-off state of the present invention;

[0026] In the diagram: 1. Valve body; 2. Valve disc; 3. Cut-off spring; 4. Steel ball bushing; 5. Pull rod; 6. Steel ball; 7. Diaphragm; 8. Diaphragm bushing; 9. Steel ball bushing return spring; 10. Pressure loss adjustment spring; 11. Overpressure adjustment spring; 12. Straight pipe connector; 13. Upper diaphragm cover; 14. Lower diaphragm cover; 15. Sealing element; 16. Sealing ring; 17. Detailed Implementation

[0027] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can understand the advantages and effects of the present invention from the content disclosed in this specification. It should be noted that the illustrations provided in the following embodiments are for illustrative purposes only and represent schematic diagrams, not actual pictures, and should not be construed as limiting the present invention. In order to better illustrate the embodiments of the present invention, some components in the figures may be omitted, enlarged, or reduced, and do not represent the actual product size; it is understandable for those skilled in the art that some well-known structures and their descriptions may be omitted in the figures.

[0028] In the figures of this invention, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figure, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the figures are only for illustrative purposes and should not be construed as limiting this invention. For those skilled in the art, the specific meaning of the above-mentioned terms can be understood according to the specific circumstances.

[0029] Example

[0030] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the core technical solution of the present invention is to achieve the function of a shut-off valve by setting bosses on the pull rod 5 and the diaphragm bushing 8, and by the rolling action of steel balls 6 and multiple springs.

[0031] The shut-off valve is connected to valve body 1 by bolts, such as Figure 2 As shown, the upper diaphragm cover 13 and the lower diaphragm cover 14 are connected as one piece by bolts. The valve is equipped with a valve disc 2, a pull rod 5, a cut-off spring 3, a steel ball bushing 4, a steel ball 6, a diaphragm 7, a diaphragm bushing 8, a steel ball bushing return spring 9, a pressure loss adjustment spring 10, and an overpressure adjustment spring 11.

[0032] The pull rod 5 is provided with a pull rod boss 501, and the membrane bushing 8 is provided with a membrane bushing boss 801;

[0033] The pull rod 5 is vertically arranged at the axis of the shut-off valve. A shut-off spring 3 is provided at the front end, and a steel ball bushing 4 is provided on the outside. The steel ball bushing 4 has a hole to place the steel ball 6 and is connected to the steel ball bushing return spring 9. It is placed in the diaphragm bushing 8. A sealing ring 17 is provided on the right end of the diaphragm bushing 8 and the outer circumference of the pull rod 5 to effectively isolate the gas in the monitoring chamber from the outside. The diaphragm 7 divides the shut-off valve cavity into a monitoring chamber and an atmospheric pressure chamber and is connected to the diaphragm bushing 8 as a whole.

[0034] A pressure-reducing spring 10 is provided on the outer right end of the diaphragm bushing 8. An overpressure adjusting spring 11 is provided between the pressure-reducing spring 10 and the upper diaphragm cover 13. A straight pipe connector 12 connects the monitoring chamber to the pipeline. The tail end of the upper diaphragm cover 13 is closed by a sealing cap 15, and a sealing element 16 is provided between the upper diaphragm cover 13 and the sealing cap 15 to effectively prevent external moisture from entering the interior of the parts, thus providing protection and moisture protection.

[0035] This embodiment uses an overpressure cutoff pressure of 50 kPa and an underpressure cutoff pressure of 40 kPa as an example to illustrate the operation process of the shut-off valve as follows:

[0036] When the pressure in the monitoring chamber is between 40 kPa and 50 kPa, the shut-off valve is in the suspended state. Figure 1 As shown, the detailed internal structure is as follows: Figure 3 As shown, to better illustrate the positional relationship between the steel ball and other components, Figure 3 The section lines have been omitted.

[0037] Overpressure process: The gas pipeline is connected to the monitoring chamber through the straight pipe joint 12. When the gas pressure in the gas pipeline rises above 50 kPa, the gas pressure in the monitoring chamber rises simultaneously above 50 kPa. The diaphragm 7 drives the diaphragm bushing 8 to move to the right, which in turn pushes the compression pressure relief adjustment spring 10 and the overpressure adjustment spring 11. The steel ball 6 reaches the space to the left of the diaphragm bushing boss 801 and gets space to come out. After the steel ball 6 comes out, the pull rod 5 moves to the left under the action of the spring force of the cutting spring 3. The pull rod boss 501 passes over the steel ball 6, and the pull rod 5 pops out to the left and cuts off the gas in the valve body 1 through the valve disc 2.

[0038] When valve body 1 is shut off, the gas pressure in the gas pipe decreases, and the gas pressure in the monitoring chamber decreases synchronously. When the pressure drops to between 40Kpa and 50Kpa, the diaphragm bushing 8 returns to the suspended position under the action of the overpressure regulating spring 11 and the underpressure regulating spring 10.

[0039] The function of the pressure relief adjusting spring 10 is that when the pressure is below 40 kPa, the diaphragm bushing 8 is pushed to the pressure relief cut-off position by the pressure relief adjusting spring 10, and the valve stem cannot be reset. It can only be reset when the pressure increases to 40 kPa-50 kPa. If the pressure relief adjusting spring 10 is removed, there is no such restriction. As long as the pressure is below the cut-off pressure, it can be reset.

[0040] When reset is required, pull rod 5 is moved to the right. The pull rod boss 501 on pull rod 5 drives steel ball 6 and steel ball bushing 4 to move to the right. When they move a certain distance, steel ball 6 gets space to dislodge outward. After steel ball 6 dislodges, pull rod 5 passes over steel ball 6. Then steel ball bushing 4 drives steel ball 6 to move to the left under the action of steel ball bushing reset spring 9. At this point, pull rod 5 is released, and the reset work after cutting is achieved under the action of cutting spring 3.

[0041] Depressurization process: When the pressure in the monitoring chamber is below 40 kPa, the overpressure regulating spring 11 does not function, and the depressurization regulating spring 10 pushes the diaphragm bushing 8 to the left. The steel ball 6 reaches the space to the right of the diaphragm bushing boss 801, and obtains space to detach outward. After the steel ball 6 detaches, the pull rod 5 moves to the left under the action of the spring force of the cutting spring 3. The pull rod boss 501 passes over the steel ball 6, and the pull rod 5 pops out to the left and cuts off the gas in the valve body 1 through the valve disc 2.

[0042] In this technical solution, the pull rod 5 is not subjected to unbalanced forces inside the lower diaphragm cover 14, which improves the shut-off accuracy of the shut-off valve. When the shut-off pressure is very high, it means that the spring force is also very high, but this structure is not affected by the spring force, and can meet the needs of different working conditions. It solves the problem that the shut-off valve is applicable to both low and high pressure conditions, and can also take into account overpressure and underpressure, making it more sensitive to pressure and more reliable.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A widely applicable safety shut-off valve comprising an upper membrane cover (13), a lower membrane cover (14), a closure cap (15), a valve flap (2) and a pull rod (5), characterized in that Also include, cut off spring (3), steel ball bushing (4), steel ball (6), diaphragm (7), skin film bushing (8), steel ball bushing reset spring (9), pressure loss adjusting spring (10), overpressure adjusting spring (11), straight pipe joint (12); The pull rod (5) is provided with a pull rod boss (501), and the skin film bushing (8) is provided with a skin film bushing boss (801); The pull rod (5) is vertically arranged at the center position of the cut-off valve, and the front end is provided with a cut-off spring (3), and the outside is provided with a steel ball bushing (4), the steel ball bushing (4) is provided with a hole for placing a steel ball (6), and is connected with a steel ball bushing reset spring (9), and is placed in a skin film bushing (8), a sealing ring (17) is arranged on the outer circumference of the pull rod (5) in the right end of the skin film bushing (8), which effectively separates the gas in the monitoring gas chamber from the outside, the diaphragm (7) divides the cut-off valve cavity into a monitoring gas chamber and an atmospheric pressure chamber, and is connected with the skin film bushing (8) as a whole; The right end of the skin film bushing (8) is provided with a pressure loss adjusting spring (10) outside, the pressure loss adjusting spring (10) and the upper membrane cover (13) are provided with an overpressure adjusting spring (11) therebetween, the straight pipe joint (12) connects the monitoring gas chamber with the pipeline; the tail end of the upper membrane cover (13) is closed through a sealing cover (15), and a sealing element (16) is arranged between the upper membrane cover (13) and the sealing cover (15), which effectively prevents external water vapor from entering the inside of the part and plays a protection and moisture-proof role.

2. A safety shut-off valve according to claim 1, characterised in that The pressure loss cut-off pressure of the pressure loss adjusting spring (10) is less than the overpressure cut-off pressure of the overpressure adjusting spring (11).

3. A safety shut-off valve according to claim 2, characterised in that, When the reset pressure is between the pressure loss cut-off pressure of the pressure loss adjusting spring (10) and the overpressure cut-off pressure of the overpressure adjusting spring (11), the skin film bushing (8) returns to the suspended position under the action of the overpressure adjusting spring (11) and the pressure loss adjusting spring (10).

4. A safety shut down valve according to claim 1, wherein, The valve flap (2) can be replaced by a striker.

5. A safety shut down valve according to claim 1, wherein, The diaphragm (7) is a double-wave flexible pressure sensing element.

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