A detection component for bellows leakage faults

Abstract

This application relates to the field of safety valves, specifically disclosing a bellows leakage fault detection component applied to a safety valve with a bellows. The safety valve includes a valve cover and comprises: an adapter, which includes a first interface, a second interface, a third interface, and a channel, the channel communicating with the first, second, and third interfaces; the first interface for connecting to an opening on the valve cover; an automatic shut-off valve fixed to the second interface, used to automatically close when the pressure in the channel exceeds a preset pressure value; and a pressure sensor fixed to the third interface, used to detect the pressure in the channel. When the pressure value indicated by the pressure sensor is greater than the preset pressure value, the pressure sensor indicates a bellows leakage fault. The solution provided in this application helps to avoid the consequences of large-scale bellows leakage and promptly prevents leakage of the medium inside the valve.

Description

Technical Field

[0001] This application relates to the technical field of safety valves, and in particular to a detection component for bellows leakage faults. Background Technology

[0002] A safety valve is an automatic valve that uses the pressure of the medium itself to discharge a rated amount of fluid, preventing the system pressure from exceeding the safe value. A balanced bellows safety valve is a conventional safety valve with an added bellows, widely used in overpressure protection. The bellows not only eliminates the impact of back pressure fluctuations on the safety valve's performance but also prevents the medium from entering the valve cover and corroding the spring and other internal components.

[0003] Bellows are typically made of thin-walled metal sheets and are considered vulnerable components. Leaks may occur when the back pressure exceeds the upper limit of the bellows' pressure tolerance, or when the medium contains corrosive substances such as sulfides or chlorides.

[0004] In practical applications, the initial leakage of bellows leaks is generally small, making it difficult to observe the leakage through the valve cover side hole. Only when the leakage is large can it be observed through the valve cover side hole, thus indicating a bellows leak. After a bellows leak, the back pressure fluctuation causes inaccurate opening pressure of the safety valve, which can seriously affect the overpressure protection performance of the safety valve. If the medium contains flammable, explosive, or toxic substances, there is a significant safety hazard. Corrosive media entering the valve cover cavity can corrode the springs and other internal components, affecting the performance of the safety valve and potentially interfering with normal continuous operation. Furthermore, the continuous discharge of the medium into the atmosphere increases air pollution and is detrimental to energy conservation and emission reduction.

[0005] Currently, conventional methods for detecting bellows leaks include acoustic signal detection, gas sensors, and pH test strips. Acoustic signal detection is easily affected by external acoustic signals, and gas sensors and pH test strips have limited media applicability. Therefore, there is an urgent need to develop a device that can be used in safety valves to detect bellows leaks promptly, preventing large-scale leaks and stopping further leakage of the media within the valve. Summary of the Invention

[0006] This application provides a detection component for bellows leakage faults, with the aim of providing a solution for detecting bellows leakage, so as to avoid the consequences of large-scale bellows leakage and timely stop the leakage of media inside the valve.

[0007] In a first aspect, a detection component for bellows leakage faults is provided, applied to a safety valve having a bellows, the safety valve including a valve cover, comprising:

[0008] An adapter, comprising a first interface, a second interface, a third interface, and a channel, wherein the channel is in communication with the first interface, the second interface, and the third interface, and the first interface is used to connect to an opening on the valve cover;

[0009] An automatic shut-off valve, fixed to the second interface, is used to automatically close when the pressure in the channel exceeds a preset pressure value;

[0010] A pressure sensor, fixed to the third interface, is used to detect the pressure in the channel. When the pressure value indicated by the pressure sensor is greater than the preset pressure value, the pressure sensor is used to indicate that the bellows has a leakage fault.

[0011] Compared with the prior art, the solution provided in this application has at least the following beneficial technical effects:

[0012] When the safety valve is operating normally, the valve cover cavity is connected to the atmosphere via an adapter and an automatic shut-off valve, which does not affect the performance of the safety valve. After a bellows leak, the medium inside the valve enters the valve cover cavity, the adapter, and the automatic shut-off valve. When the leakage pressure reaches a preset pressure value, the automatic shut-off valve automatically closes under pressure, sealing the leakage path and preventing external leakage. At this time, a pressure sensor can detect the increase in pressure inside the valve cover cavity, indicating a bellows leakage fault. The bellows leakage fault detection component provided in this application also features a compact structure and high sensitivity.

[0013] In conjunction with the first aspect, in some implementations of the first aspect, the automatic shut-off valve includes:

[0014] The valve body is a hollow component and has a valve body opening that communicates with the second interface;

[0015] A valve seat having an open valve seat opening;

[0016] The cavity of the valve body contains a movable valve core. Under the pressure from the channel, the movable valve core can move toward the valve seat and seal the valve seat opening.

[0017] Both the valve body and seat have openings, allowing the entire automatic shut-off valve to be open to the atmosphere without affecting the normal operation of the safety valve. When the medium leaks, the movable valve core, which moves within the valve body, can seal the opening of the valve seat under the pressure of the medium, allowing the automatic shut-off valve to close automatically under pressure. In some embodiments, a gap may exist between the outer circumference of the movable valve core and the inner wall of the valve body to ensure the entire automatic shut-off valve is open to the atmosphere, and to prevent large amounts of leaked medium from passing through the gap, allowing the movable valve core to move under the force of the medium.

[0018] In conjunction with the first aspect, in some implementations of the first aspect, the movable valve core includes a diaphragm for bearing the pressure from the channel, moving the movable valve core toward the valve seat, and sealing the valve seat opening.

[0019] The automatic shut-off valve adopts a large-size diaphragm soft seal design. On the one hand, it increases the sealing diameter and the force-bearing area of ​​the sealing pair. On the other hand, compared with other soft seal types such as O-rings and fluoroplastics, the diaphragm is easy to deform and can achieve sealing under small pressure.

[0020] In conjunction with the first aspect, in some implementations of the first aspect, the cavity of the valve body further accommodates a guide sleeve, the guide sleeve having a mounting hole, the axis of the mounting hole being coaxial with the axis of the second interface;

[0021] The movable valve core also includes a valve disc, on the side of the valve disc near the valve seat the diaphragm is fixed thereon, and on the side of the valve disc away from the valve seat there is a mounting shaft, which is disposed in the mounting hole and can move relative to the guide sleeve along the hole axis of the mounting hole.

[0022] The mounting hole of the guide sleeve can guide the mounting shaft of the valve disc, allowing the diaphragm to move along the hole shaft of the mounting hole, reducing the degree of diaphragm movement deviation, and ensuring that the diaphragm can be aligned with the valve seat opening for sealing.

[0023] In this application, the adapter, valve body, valve seat, valve disc, guide sleeve, and other components of the automatic shut-off valve can all be made of aluminum alloy, resulting in a lighter weight. The valve disc adopts an integrated design, which is compact, reduces weight, and allows it to operate under minimal pressure.

[0024] In conjunction with the first aspect, in some implementations of the first aspect, the end of the mounting shaft facing away from the valve seat protrudes relative to the mounting hole; the movable valve core further includes:

[0025] A locking element, which is fixed to the end;

[0026] A spring seat, the spring seat being fixed to the side of the locking member near the valve seat;

[0027] A spring surrounds the outer periphery of the mounting shaft, with one end of the spring abutting against the guide sleeve and the other end of the spring abutting against the spring seat.

[0028] On the one hand, by setting an elastic element on the valve disc, the range of motion of the diaphragm can be limited. When the bellows is not leaking, the diaphragm is spaced apart from the valve seat opening to ensure that the diaphragm does not seal the valve seat opening; when the bellows leaks, the diaphragm moves away from the guide sleeve under the force of the leaking medium.

[0029] On the other hand, because the spring has the function of elastic recovery, when the pressure inside the adapter is the same as the external pressure, the spring can pull the diaphragm to the initial position set at a distance from the valve seat opening, so that the automatic switching valve can be restored from the closed state to the open state.

[0030] In conjunction with the first aspect, in some implementations of the first aspect, both the guide sleeve and the valve disc have through holes, and both the through holes on the guide sleeve and the through holes on the valve disc communicate with the valve body opening.

[0031] Both the guide sleeve and the valve disc are provided with through holes, which can improve the airflow permeability inside the automatic switching valve.

[0032] In conjunction with the first aspect, in some implementations of the first aspect, a diaphragm protection sheet is provided on the side of the diaphragm near the valve seat.

[0033] Diaphragm protectors can provide support for the diaphragm, reducing the possibility of deformation or damage during use.

[0034] In conjunction with the first aspect, in some implementations of the first aspect, the outer diameter of the diaphragm protector is less than or equal to the inner diameter of the valve seat opening.

[0035] When the automatic shut-off valve is closed, the diaphragm protector can be accommodated inside the valve seat opening to ensure that the diaphragm can seal the valve seat opening.

[0036] In conjunction with the first aspect, in some implementations of the first aspect, the axis of the first interface and the axis of the second interface are both coaxial with the axis of the channel, and the axis of the third interface is perpendicular to the axis of the channel.

[0037] The axes of the first and second interfaces are coaxial with the axis of the channel, which helps to reduce the flow resistance of the atmosphere and the medium; the axis of the third interface is perpendicular to the axis of the channel, which helps to improve the accuracy of the pressure detected by the pressure sensor.

[0038] In conjunction with the first aspect, in some implementations of the first aspect, the preset pressure value is less than or equal to 1 kPa.

[0039] If the preset pressure value is relatively small, the automatic shut-off valve can close within a small leakage pressure range, which helps to improve the detection sensitivity of the detection component. Attached Figure Description

[0040] Figure 1 A schematic structural diagram of a bellows leakage fault detection component provided in this application embodiment installed on a safety valve.

[0041] Figure 2 This is a schematic structural diagram of a bellows leakage fault detection component provided in an embodiment of this application.

[0042] Figure 3 This is a schematic structural diagram of the automatic shut-off valve in the open state, as provided in an embodiment of this application.

[0043] Figure 4 This is a schematic structural diagram of the automatic shut-off valve in the closed state, as provided in an embodiment of this application.

[0044] Explanation of reference numerals in the attached diagram: 1-Pressure sensor; 2-Adapter; 3-Automatic shut-off valve; 4-Signal output line; 5-Data processing system; 6-Valve cover; 7-Guide sleeve; 8-Bellows; 9-Recoil disc; 10-Safety valve body; 11-Locking element; 12-Spring seat; 13-Spring; 14-Valve body; 15-Guide sleeve; 16-Valve disc; 17-Diaphragm; 18-Diaphragm protector; 19-Valve seat; 20-Set screw. Detailed Implementation

[0045] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0046] Figure 1 A schematic structural diagram of a bellows leakage fault detection component provided in an embodiment of this application installed on a safety valve is shown. Figure 2 A schematic structural diagram of a bellows leakage fault detection component is shown in detail.

[0047] The opening on the valve cover 6 of the balanced bellows-type safety valve connects to the adapter 2. The adapter 2 has a first interface, a second interface, a third interface, and a channel, which communicates with the first, second, and third interfaces. In some embodiments, the axes of the first and second interfaces are coaxial with the axis of the channel, and the axis of the third interface is perpendicular to the axis of the channel.

[0048] Adapter 2 is connected to valve cover 6 via a first interface. Adapter 2 is connected to automatic shut-off valve 3 via a second interface. Adapter 2 is connected to pressure sensor 1 via a third interface. Pressure sensor 1 can detect the pressure within the channel of adapter 2. In some embodiments, pressure sensor 1 is connected to data processing system 5 via signal output line 4, thereby converting the pressure signal into an electrical signal, transmitting it to the data processing system, and triggering an alarm.

[0049] When the pressure in the passage of adapter 2 exceeds the preset pressure value, the automatic shut-off valve 3 will automatically close. If the safety valve experiences bellows leakage, the medium can leak into the valve cover 6 and enter the automatic shut-off valve 3 through adapter 2. As the medium continues to leak, the pressure in the passage of adapter 2 continuously increases. When the pressure indicated by the pressure sensor exceeds the preset pressure value, it indicates a bellows leakage fault.

[0050] Figure 3 and Figure 4 This is a schematic structural diagram of an automatic shut-off valve 3 provided in an embodiment of this application. Figure 3 The automatic shut-off valve 3 shown is in the open state. Figure 4 The automatic shut-off valve 3 shown is in the closed state. Figure 3 and Figure 4 The automatic shut-off valve 3 shown can automatically close under a certain pressure to detect bellows leakage. It should be understood that, in the embodiments provided in this application, except... Figure 3 and Figure 4 Besides the automatic shut-off valve 3 shown, there may be other automatic shut-off valves with different structures or forms.

[0051] In some embodiments provided in this application, the automatic shut-off valve 3 may include a valve seat 19 and a valve body 14. The valve seat 19 has an open valve seat opening. The valve body 14 is a hollow component with a valve body opening communicating with the second interface. The cavity of the valve body 14 houses a movable valve core. The movable valve core may refer to a movable part within the valve body 14. The movable valve core can move within the valve body 14. When the movable valve core moves to the valve seat 19, it can seal the valve seat opening of the valve seat 19 and form a sealing pair with the valve seat 19.

[0052] In some embodiments, the movable valve core may be provided with a diaphragm 17. The diaphragm 17 can be used to bear the force of the leaking medium to move the movable valve core toward the valve seat 19. The movable valve core can also seal the valve seat opening of the valve seat 19 through the diaphragm 17.

[0053] exist Figure 3 and Figure 4 In the illustrated embodiment, a guide sleeve 15 can be accommodated within the valve body 14. The guide sleeve 15 can be threaded onto the valve body 14. The guide sleeve 15 has a mounting hole. The axis of the mounting hole can be coaxial with the axis of the second interface of the adapter 2. The mounting hole accommodates the mounting axis of the valve disc 16, which can move within the mounting hole. The mounting axis of the valve disc 16 is located on the side of the valve disc 16 opposite to the valve seat 19. A diaphragm 17 can be fixed to the side of the valve disc 16 near the valve seat 19.

[0054] exist Figure 3 and Figure 4In the illustrated embodiment, a diaphragm protector 18 may be provided on the diaphragm 17. The diaphragm protector 18 may be located on the side of the diaphragm 17 closest to the valve seat 19, thereby providing support for the diaphragm 17. In one embodiment, the diaphragm 17 and the diaphragm protector 18 are fixed to the valve disc 16 by set screws 20. The outer diameter of the diaphragm protector 18 may be smaller than the inner diameter of the valve seat opening of the valve seat 19. Figure 4 As shown, when the automatic shut-off valve 3 is closed, the diaphragm protection plate 18 can be accommodated in the valve seat opening.

[0055] When the bellows is not leaking, the diaphragm 17 is spaced apart from the valve seat opening of the valve seat 19 to ensure that the diaphragm 17 does not seal the valve seat opening. When the bellows leaks, the diaphragm 17 moves away from the guide sleeve 15 under the force of the leaking medium. By providing an elastic element on the valve disc 16, the range of motion of the diaphragm 17 can be limited.

[0056] In some embodiments, the mounting shaft of the valve disc 16 protrudes relative to the mounting hole of the guide sleeve 15. A spring 13 surrounds the outer periphery of the mounting shaft of the valve disc 16, with one end of the spring 13 abutting against the guide sleeve 15 and the other end abutting against the spring seat 12. The spring seat 12 presses the spring 13 against the guide sleeve 15. The spring seat 12 is fixed to a locking member 11 (such as a lock nut). The locking member 11 is threadedly connected to the mounting shaft of the valve disc 16. The locking member 11 can adjust the preload of the spring 13.

[0057] Because spring 13 has the function of elastic recovery, when the pressure inside the adapter 2 is the same as the external pressure, spring 13 can pull the diaphragm 17 to the initial position set at a distance from the valve seat opening, so that the automatic switching valve 3 can be restored from the closed state to the open state.

[0058] The following is combined with Figures 1 to 4 This paper explains the detection principle of bellows leakage faults.

[0059] When the safety valve is operating normally, gaskets seal the upper connector of bellows 8 with the guide sleeve 7 and the lower connector of bellows 8 with the backflushing disc 9, preventing the medium from entering the inner cavity of the valve cover 6. Figure 3 As shown, the automatic shut-off valve 3 is normally open, and the inner cavity of the valve cover 6 is connected to the atmosphere through the adapter 2 and the automatic shut-off valve 3, which will not affect the performance of the balanced bellows type safety valve.

[0060] When the bellows leaks, the medium in the safety valve body 10 passes through the bellows 8 and enters the valve cover 6 through the gap between the backflushing disc 9 and the guide sleeve 7. When the leakage pressure reaches the preset pressure value (e.g., 0.1–10 kPa), the medium enters the automatic shut-off valve 3 through the channel of the adapter 2 and the second interface. Inside the automatic shut-off valve, the medium can act on the diaphragm 17 through the valve body opening of the valve body 14, through the through hole on the guide sleeve 15, and through the through hole on the valve disc 16. Under the force of the medium, the diaphragm 17 overcomes the elastic force of the spring 13, driving the movable valve core to move towards the valve seat 19, thereby allowing the diaphragm 17 to seal the valve seat opening of the valve seat 19, such as… Figure 4 As shown. This prevents leakage of the medium inside the valve.

[0061] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope defined in the claims of the present invention.

Claims

1. A detection assembly for bellows leakage faults, applied to a safety valve having a bellows, the safety valve including a valve cover (6), characterized in that, include: The adapter (2) includes a first interface, a second interface, a third interface and a channel, the channel being connected to the first interface, the second interface and the third interface, and the first interface being used to connect to the opening on the valve cover (6); Automatic shut-off valve (3) is fixed to the second interface. When the safety valve is working normally, the medium is blocked from entering the inner cavity of the valve cover (6). The inner cavity of the valve cover (6) is connected to the atmosphere through the adapter (2) and the automatic shut-off valve (3). When the pressure in the channel exceeds the preset pressure value, the automatic shut-off valve (3) automatically closes to prevent the medium in the valve from leaking. Pressure sensor (1), the pressure sensor (1) is fixed to the third interface and is used to detect the pressure in the channel. When the pressure value indicated by the pressure sensor (1) is greater than the preset pressure value, the pressure sensor (1) is used to indicate that the bellows has a leakage fault. The automatic shut-off valve (3) includes: Valve body (14), the valve body (14) is a hollow part, the valve body (14) has a valve body opening that communicates with the second interface; A valve seat (19) has an open valve seat opening formed on a protrusion of the valve seat (19) facing the valve body (14). The inner diameter of the valve seat opening is larger than the inner diameter of the adapter (2) channel. The cavity of the valve body (14) contains a movable valve core. Under the pressure from the channel, the movable valve core can move toward the valve seat (19) and seal the valve seat opening. The cavity of the valve body (14) also contains a guide sleeve (15). The guide sleeve (15) has a mounting hole, and the axis of the mounting hole is coaxial with the axis of the second interface. The movable valve core includes a valve disc (16) and a diaphragm (17). The diaphragm (17) is fixed to the side of the valve disc (16) near the valve seat (19). The diaphragm (17) is fixed to the valve disc (16) by a set screw (20). The side of the valve disc (16) away from the valve seat (19) has a mounting shaft. The mounting shaft is disposed in the mounting hole and can move relative to the guide sleeve (15) along the hole axis of the mounting hole. Both the guide sleeve (15) and the valve disc (16) have through holes. The through holes on the guide sleeve (15) and the valve disc (16) are connected to the valve body opening. There is a gap between the diaphragm (17) and the through hole of the valve disc (16). The diaphragm (17) is used to bear the pressure from the channel, drive the movable valve core to move toward the valve seat (19), and seal the valve seat opening. A diaphragm protector (18) is provided on the side of the diaphragm (17) near the valve seat (19). The diaphragm protector (18) is used to provide support for the diaphragm (17). The outer diameter of the diaphragm protector (18) is less than or equal to the inner diameter of the valve seat opening. When the automatic shut-off valve is closed, the diaphragm protector (18) is accommodated in the valve seat opening to ensure that the diaphragm (17) seals the valve seat opening.

2. The detection component according to claim 1, characterized in that, The end of the mounting shaft opposite to the valve seat (19) protrudes relative to the mounting hole; the movable valve core further includes: A locking member (11) is fixed to the end; A spring seat (12) is fixed to the side of the locking member (11) near the valve seat (19); A spring (13) surrounds the outer periphery of the mounting shaft, one end of the spring (13) abuts against the guide sleeve (15), and the other end of the spring (13) abuts against the spring seat (12).

3. The detection component according to claim 1, characterized in that, The axes of the first interface and the second interface are coaxial with the axis of the channel, and the axis of the third interface is perpendicular to the axis of the channel.

4. The detection component according to claim 1, characterized in that, The preset pressure value is less than or equal to 1 kPa.

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