A gas valve capable of monitoring valve sealing performance in real time

Abstract

The present invention discloses a gas valve capable of real-time monitoring of valve sealing, which relates to the field of valve monitoring technology and is mainly used to solve the problem that it is currently impossible to achieve real-time monitoring of valve sealing and timely warning of valve leakage. Its main structure is: a mounting notch is provided at the top of the valve body, and a monitoring cavity diaphragm, a monitoring cavity, an air cavity diaphragm and an air cavity are arranged in the mounting notch from top to bottom in sequence, a sealing valve core block capable of downwardly closing the sealing pore and in contact with the air cavity diaphragm at the top is floatingly installed in the air cavity, a transmission block is arranged in the monitoring cavity, and a valve stem is arranged above the monitoring cavity diaphragm; a sensing cavity connected to the monitoring cavity through a monitoring side cavity is arranged on the side wall of the valve body, a strain diaphragm and a detector capable of detecting the concave and convex changes of the strain diaphragm are arranged in the sensing cavity, and the monitoring cavity and the monitoring side cavity are both vacuum cavities. The present invention provides a gas valve capable of real-time monitoring of valve sealing, which can monitor the valve sealing in real time and timely warn of valve leakage.

Description

Technical Field

[0001] The present invention relates to the technical field of valve monitoring, and in particular to a gas valve capable of monitoring the sealing performance of the valve in real time. Background Art

[0002] Valves are control components in fluid delivery systems, with functions such as diversion, interception, regulation, energy saving, backflow prevention, diversion or overflow pressure relief. There are many types of valves, but the basic functions are to open and close pipelines, control flow direction, and adjust and control the parameters of the conveying medium (temperature, pressure and flow).

[0003] The sealing performance of a valve refers to the ability of each sealing part of the valve to prevent the leakage of the medium. It is an important indicator to measure the function and quality of the valve. In actual working conditions, valves often leak. This is mainly because the valves are mostly in harsh working conditions: such as large temperature difference, high medium pressure or highly corrosive, flammable and explosive, or even toxic. According to the nuclear power plant accident cases of the International Atomic Energy Agency (IAEA), shutdowns or reactor shutdowns caused by valve failures and failures, and even nuclear leakage account for a relatively high proportion of nuclear power plant accidents. At present, the international community has generally recognized the importance of low-leakage valves to environmental protection. Therefore, reducing the escape of tiny media from valves to the external environment has become a necessary measure to improve environmental pollution. However, this extremely tiny leakage cannot be determined by conventional water or nitrogen tests, and requires more scientific means and precise instruments to quantify inspection and monitoring.

[0004] Valve leakage is mainly divided into two types: external leakage and internal leakage. Among them, external leakage refers to the leakage caused by external gas entering the valve through the valve stem seal; while internal leakage refers to the leakage caused by the failure of the seal between the valve seal and the valve seat, and the medium cannot be cut off. This kind of leakage often only occurs inside the valve.

[0005] In order to respond promptly to valve leakage, the Chinese invention patent with application number CN115909671A provides a dangerous and explosive gas monitoring and early warning system. However, the system can only provide early warning for working gas leaking into the air, and cannot provide timely early warning for valve leakage. This results in a large amount of gas leaking into the working environment before the early warning signal is responded, especially for toxic, harmful, flammable, and explosive gases, which may bring safety hazards once leakage occurs.

[0006] Therefore, there is an urgent need for a gas valve that can monitor valve sealing in real time and give early warning of valve leakage in a timely manner. Summary of the invention

[0007] The purpose of the present invention is to provide a gas valve capable of monitoring the sealing performance of the valve in real time, which can monitor the sealing performance of the valve in real time and give early warning of valve leakage in a timely manner.

[0008] The technical solution of the present invention to solve the above technical problems is: a gas valve capable of real-time monitoring of valve sealing, comprising a valve body, an air inlet interface and an air outlet interface are respectively arranged on both sides of the valve body, a mounting notch extending downward is arranged on the top of the valve body, and a monitoring cavity diaphragm, a monitoring cavity, an air cavity diaphragm and an air cavity are arranged in sequence from top to bottom in the mounting notch;

[0009] The bottom of the air cavity is provided with two sealing air holes which are connected with the air inlet interface and the air outlet interface respectively. A sealing valve core block which can close the sealing air holes downward and whose top is in contact with the air cavity diaphragm is also installed in a floating manner in the air cavity. A transmission block which can move up and down is provided in the monitoring cavity, and the top and bottom of the transmission block are in contact with the monitoring cavity diaphragm and the air cavity diaphragm respectively. A valve stem which can move up and down and whose lower end is in contact with the monitoring cavity diaphragm is also provided above the monitoring cavity diaphragm;

[0010] The valve body side wall is also provided with a sensing cavity, and a monitoring side cavity connected to the monitoring cavity is provided at the bottom of the sensing cavity. A strain diaphragm is also provided in the sensing cavity, the edge of which is sealedly connected to the side wall of the sensing cavity, and a detector capable of detecting convex and concave changes of the strain diaphragm is provided on the side of the strain diaphragm facing away from the bottom of the sensing cavity. Both the monitoring cavity and the monitoring side cavity are vacuum cavities.

[0011] As a further improvement of the present invention, one of the sealed air holes is communicated with the air inlet interface through an air duct, and the other sealed air hole is communicated with the air outlet interface through an air duct.

[0012] As a further improvement of the present invention, a mounting groove is provided at the bottom of the air cavity, and a sealing air hole is arranged at the bottom of the mounting groove. The sealing valve core block is floatingly installed in the mounting groove, and there is a clearance fit between the side wall of the sealing valve core block and the side wall of the mounting groove.

[0013] As a further improvement of the present invention, a spring sheet is sleeved on the outside of the sealing valve core block, and the upper end of the spring sheet is in tight contact with the side wall of the sealing valve core block, and the lower end of the spring sheet is in tight contact with the bottom of the air cavity.

[0014] As a further improvement of the present invention, a valve cover with an outer wall sealedly connected to the inner wall of the installation notch is provided above the monitoring cavity diaphragm, and a valve stem which can move up and down and whose lower end contacts the monitoring cavity diaphragm is penetrated through the axis of the valve cover.

[0015] As a further improvement of the present invention, the lower end surface of the valve cover is arranged in contact with the monitoring cavity diaphragm.

[0016] As a further improvement of the present invention, the valve cover and the valve stem are connected by threaded fitting.

[0017] As a further improvement of the present invention, the detector is provided with a low-pressure probe, a flat-pressure probe and a high-pressure probe extending toward the strain diaphragm on one side close to the strain diaphragm, and the length of the low-pressure probe is greater than that of the flat-pressure probe, and the length of the flat-pressure probe is greater than that of the high-pressure probe.

[0018] As a further improvement of the present invention, the low-pressure probe, the flat-pressure probe and the high-pressure probe all have two.

[0019] As a further improvement of the present invention, a signal sending probe extending to the outside of the valve body is provided on the side of the detector away from the strain diaphragm.

[0020] Beneficial Effects

[0021] Compared with the prior art, the advantages of the gas valve capable of real-time monitoring of valve sealing of the present invention are:

[0022] When the gas valve leaks externally, the external gas will first break through the monitoring cavity diaphragm and enter the monitoring cavity. When the gas valve leaks internally, the medium gas will first break through the gas cavity diaphragm and enter the monitoring cavity. Since the monitoring cavity and the monitoring side cavity are both vacuum cavities, once the gas valve leaks, the air pressure in the monitoring cavity and the monitoring side cavity will increase, causing the strain diaphragm to bulge toward the detector side, so that the detector can detect valve leakage in time and issue an early warning. Therefore, the gas valve can realize real-time monitoring of valve sealing and issue an early warning of valve leakage in time.

[0023] The present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, which are used to illustrate embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A perspective view of the present invention;

[0026] Figure 2 It is a front view cross-sectional view of the present invention;

[0027] Figure 3 It is a side sectional view of the present invention;

[0028] Figure 4 It is a three-dimensional diagram of the detector of the present invention.

[0029] Among them: 1-valve body; 11-air inlet interface; 12-air outlet interface; 13-air duct; 14-sealing air hole; 15-sensing chamber; 151-strain diaphragm; 2-valve cover; 3-valve stem; 31-monitoring chamber diaphragm; 32-transmission block; 33-air chamber diaphragm; 341-spring sheet; 4-monitoring chamber; 41-monitoring side chamber; 42-air chamber; 5-detector; 51-signal sending probe; 52-low pressure probe; 53-flat pressure probe; 54-high pressure probe. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; of course, it can also be a mechanical connection or an electrical connection; in addition, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Embodiments of the present invention will now be described with reference to the accompanying drawings.

[0033] Example:

[0034] The specific embodiments of the present invention are as follows Figure 1-4 As shown, a gas valve capable of real-time monitoring of valve sealing performance comprises a valve body 1, and both sides of the valve body 1 are provided with an air inlet interface 11 and an air outlet interface 12. A mounting notch extending downward is provided at the top of the valve body 1, and a monitoring cavity diaphragm 31, a monitoring cavity 4, an air cavity diaphragm 33 and an air cavity 42 are provided in the mounting notch from top to bottom. The edges of the monitoring cavity diaphragm 31 and the air cavity diaphragm 33 are both sealed and connected to the side walls of the mounting notch.

[0035] The bottom of the air cavity 42 is provided with two sealing air holes 14 respectively connected to the air inlet interface 11 and the air outlet interface 12. In this embodiment, one of the sealing air holes 14 is connected to the air inlet interface 11 through the air channel 13, and the other sealing air hole 14 is connected to the air outlet interface 12 through the air channel 13.

[0036] A sealing valve core block 34 is also installed in the air cavity 42 in a floating manner, which can close the sealing air hole 14 downwards and the top of which is in contact with the air cavity diaphragm 33. Specifically: a mounting groove is provided at the bottom of the air cavity 42, and the sealing air hole 14 is arranged at the bottom of the mounting groove. The sealing valve core block 34 is installed in the mounting groove in a floating manner, and there is a clearance fit between the side wall of the sealing valve core block 34 and the side wall of the mounting groove. In this embodiment, in order to realize the floating installation of the sealing valve core block 34, a spring sheet 341 is provided on the outside of the sealing valve core block 34, and the upper end of the spring sheet 341 is in close contact with the side wall of the sealing valve core block 34, and the lower end of the spring sheet 341 is in close contact with the bottom of the air cavity 42.

[0037] A transmission block 32 that can move up and down is provided in the monitoring chamber 4, and the top and bottom of the transmission block 32 are in contact with the monitoring chamber diaphragm 31 and the air chamber diaphragm 33 respectively. A valve stem 3 that can move up and down and whose lower end is in contact with the monitoring chamber diaphragm 31 is also provided above the monitoring chamber diaphragm 31. Regarding the specific installation of the valve stem 3, a valve cover 2 whose outer wall is sealedly connected to the inner wall of the installation notch is provided above the monitoring chamber diaphragm 31, and a valve stem 3 that can move up and down and whose lower end is in contact with the monitoring chamber diaphragm 31 is provided through the axis of the valve cover 2. In this embodiment, the lower end surface of the valve cover 2 is in contact with the monitoring chamber diaphragm 31. The valve cover 2 and the valve stem 3 are threadedly connected.

[0038] In addition, the side wall of the valve body 1 is also provided with a sensing chamber 15, and the bottom of the sensing chamber 15 is provided with a monitoring side chamber 41 connected to the monitoring chamber 4. A strain diaphragm 151 whose edge is sealed and connected to the side wall of the sensing chamber 15 is also provided in the sensing chamber 15, and a detector 5 capable of detecting the concave-convex changes of the strain diaphragm 151 is provided on the side of the strain diaphragm 151 facing away from the bottom of the sensing chamber 15. The monitoring chamber 4 and the monitoring side chamber 41 are both vacuum chambers. In this embodiment, the monitoring chamber diaphragm 31, the air chamber diaphragm 33 and the strain diaphragm 151 are all stainless steel diaphragms.

[0039] In the gas valve, each valve component is welded by vacuum welding, that is, the whole welding process is in a vacuum environment. Therefore, when the valve components are welded, the monitoring chamber 4 and the monitoring side chamber 41 are both in a vacuum state. After the valve is welded, the detector 5 is assembled by threaded connection in the atmospheric environment, and the pressure in the sensing chamber 15 between the detector 5 and the strain diaphragm 151 is set to the standard atmospheric pressure, and the strain diaphragm 151 will bulge toward the monitoring side chamber 41. At this time, it is only necessary to take the bulging state of the strain diaphragm 151 as the zero position and determine the position of the detection end of the detector 5 - as long as there is a trace of air pressure in the monitoring side chamber 41, the strain diaphragm 151 will also move toward the detector 5 side. In this state, the strain diaphragm 151 is in a stress balance state, so the strain diaphragm 151 and the detector 5 are in a disconnected state, and the alarm system is not triggered. This design is because it is easy to operate in the atmospheric environment, and it is easy to adjust the position of the detector 5 by threaded matching, which can better control the valve manufacturing quality.

[0040] During the use of the gas valve, if the gas valve leaks, the external gas will first break through the monitoring cavity diaphragm 31 and enter the monitoring cavity 4; if the gas valve leaks internally, the medium gas will first break through the gas cavity diaphragm 33 and enter the monitoring cavity 4. Since the monitoring cavity 4 and the monitoring side cavity 41 are both vacuum cavities, once the gas valve leaks, the air pressure in the monitoring cavity 4 and the monitoring side cavity 41 will increase, causing the strain diaphragm 151 to bulge toward the detector 5 side, so that the detector 5 can detect the valve leakage in time and issue an early warning. Therefore, the gas valve can realize real-time monitoring of the valve sealing and issue an early warning of the valve leakage in time.

[0041] Regarding the specific structure of the detector 5: the detector 5 is provided with a low-pressure probe 52, a flat-pressure probe 53 and a high-pressure probe 54 extending toward the strain diaphragm 151 on the side close to the strain diaphragm 151, and the length of the low-pressure probe 52 is greater than the length of the flat-pressure probe 53, and the length of the flat-pressure probe 53 is greater than the high-pressure probe 54. In this embodiment, there are two low-pressure probes 52, flat-pressure probes 53 and high-pressure probes 54. And the detector 5 is provided with a signal-emitting probe 51 extending outside the valve body 1 on the side away from the strain diaphragm 151.

[0042] When the valve is in use, one atmosphere, about 100 kPa, is used as the dividing line, and pressures lower than, equal to, and higher than one atmosphere are named low pressure, normal pressure, and high pressure, respectively. The corresponding pressure sensing probes are low pressure probe 52, normal pressure probe 53, and high pressure probe 54, respectively.

[0043] When a valve leaks, it can be divided into two situations:

[0044] One situation is valve leakage, that is, the gas from the external environment leaks to the monitoring chamber 4 and the monitoring side chamber 41 through the monitoring chamber diaphragm 31. At this time, the monitoring chamber diaphragm 31 is damaged, and the seal of the monitoring chamber 4 fails, but the air chamber diaphragm 33 and the strain diaphragm 151 are intact, and toxic and harmful gases cannot leak into the atmosphere. In this state, the pressure on the monitoring side chamber 41 side of the strain diaphragm 151 is an atmospheric pressure, which drives the strain diaphragm 151 to deviate from the equilibrium position and move toward the detector 5 side. In this process, the strain diaphragm 151 first contacts the low-pressure probe 52, opens the circuit, and triggers a low-pressure alarm signal. In addition, the strain diaphragm 151 will continue to move toward the detector 5 side until it contacts the flat-pressure probe 53, opens the circuit, and triggers a flat-pressure alarm signal. That is, when the valve leaks, it will trigger two alarm signals, low pressure and flat pressure.

[0045] Another situation is the internal leakage of the valve. The working gas in the airway 13 leaks to the monitoring cavity 4 and the monitoring side cavity 41 through the sealing pores 14 and the air cavity diaphragm 33. At this time, the air cavity diaphragm 33 is damaged, and the air cavity 42 of the working gas circuit fails to seal, resulting in the destruction of the valve sealing structure. However, the monitoring cavity diaphragm 31 and the strain diaphragm 151 are intact, and toxic and harmful gases cannot leak into the atmosphere. In this state, the pressure on the monitoring side cavity 41 side of the strain diaphragm 151 is the working gas pressure. This pressure drives the strain diaphragm 151 to deviate from the equilibrium position and shift toward the detector 5 side. The displacement is related to the pressure of the working gas. Using one atmospheric pressure - about 100 kPa as the dividing line, the working gas pressure is divided into three types, namely, lower than, equal to, and higher than one atmospheric pressure.

[0046] When the pressure of the working gas is lower than one atmospheric pressure, the strain diaphragm 151 will contact the low-pressure probe 52, thereby completing the circuit and triggering a low-pressure alarm signal.

[0047] When the working gas pressure is equal to one atmospheric pressure, the strain diaphragm 151 first contacts the low-pressure probe 52, connects the circuit, and triggers the low-pressure alarm signal. Then, the strain diaphragm 151 will continue to move toward the detector 5 until it contacts the flat-pressure probe 53, connects the circuit, and triggers the flat-pressure alarm signal. That is, when the working gas pressure is equal to one atmospheric pressure, both low-pressure and flat-pressure alarm signals will be triggered.

[0048] When the working gas pressure is higher than one atmospheric pressure, the strain diaphragm 151 first contacts the low-pressure probe 52, connects the circuit, and triggers the low-pressure alarm signal. Then, the strain diaphragm 151 continues to move toward the detector 5 under the pressure difference to contact the flat-pressure probe 53, connects the circuit, and triggers the flat-pressure alarm signal. After that, the strain diaphragm 151 will continue to move toward the detector 5 until it contacts the high-pressure probe 54, connects the circuit, and triggers the high-pressure alarm signal. That is, when the working gas pressure is higher than one atmospheric pressure, three alarm signals of low pressure, flat pressure, and high pressure will be triggered.

[0049] In the above situation, when the low-pressure and flat-pressure alarm signals are triggered, the valve may leak internally or externally. For this reason, the external interference method is used to distinguish the internal and external leakage of the valve - when the low-pressure and flat-pressure alarm signals are triggered, the working gas in the working gas path is evacuated. At this time, the working gas no longer leaks to the monitoring chamber 4. If the low-pressure and flat-pressure alarm signals are still triggered, it proves that the valve is leaking externally; when only the low-pressure alarm is triggered or no alarm is triggered, it proves that the valve is leaking internally. Therefore, the valve can also easily judge whether it is leaking externally or internally.

[0050] The sealing monitoring technology of the gas valve can monitor whether the valve is leaking in real time. Once the gas valve leaks, including internal leakage and external leakage, the strain diaphragm 151 will be displaced to make the corresponding probe conductive and trigger the alarm. The operator can make emergency measures and interlock protection in time according to the monitoring alarm signal, and close the relevant valves or equipment at the first time to ensure the safety of personnel and property. The gas valve is easy to operate, has strong operability, and can efficiently monitor the sealing of the valve.

[0051] The present invention has been described above in conjunction with the best embodiments, but the present invention is not limited to the embodiments disclosed above, but should cover various modifications and equivalent combinations based on the essence of the present invention.

Claims

1. A gas valve capable of real-time monitoring of valve sealing performance, comprising a valve body (1), wherein two sides of the valve body (1) are respectively provided with an air inlet interface (11) and an air outlet interface (12), wherein: The top of the valve body (1) is provided with a mounting notch extending downward, and the mounting notch is provided with a monitoring cavity diaphragm (31), a monitoring cavity (4), an air cavity diaphragm (33) and an air cavity (42) in sequence from top to bottom; The air cavity (42) is provided with two sealing air holes (14) at the bottom thereof, which are respectively connected to the air inlet interface (11) and the air outlet interface (12); a sealing valve core block (34) is also installed in a floating manner in the air cavity (42), which can close the sealing air hole (14) downwards and whose top contacts the air cavity diaphragm (33); a transmission block (32) which can move up and down is provided in the monitoring cavity (4), and the top and bottom of the transmission block (32) are respectively in contact with the monitoring cavity diaphragm (31) and the air cavity diaphragm (33); a valve stem (3) which can move up and down and whose lower end contacts the monitoring cavity diaphragm (31) is also provided above the monitoring cavity diaphragm (31); The side wall of the valve body (1) is further provided with a sensing chamber (15), and the bottom of the sensing chamber (15) is provided with a monitoring side chamber (41) which is in communication with the monitoring chamber (4); the sensing chamber (15) is further provided with a strain diaphragm (151) whose edge is sealedly connected to the side wall of the sensing chamber (15); and a detector (5) capable of detecting concave-convex changes of the strain diaphragm (151) is provided on a side of the strain diaphragm (151) facing away from the bottom of the sensing chamber (15); the monitoring chamber (4) and the monitoring side chamber (41) are both vacuum chambers; The detector (5) is provided with a low-pressure probe (52), a flat-pressure probe (53), and a high-pressure probe (54) extending toward the strain diaphragm (151) on one side thereof close to the strain diaphragm (151), wherein the length of the low-pressure probe (52) is greater than the length of the flat-pressure probe (53), and the length of the flat-pressure probe (53) is greater than the length of the high-pressure probe (54).

2. The gas valve capable of real-time monitoring of valve sealing according to claim 1, characterized in that: One of the sealed air holes (14) is in communication with the air inlet interface (11) via the air channel (13), and the other sealed air hole (14) is in communication with the air outlet interface (12) via the air channel (13).

3. The gas valve capable of real-time monitoring of valve sealing according to claim 1, characterized in that: The bottom of the air cavity (42) is provided with a mounting groove, and the sealing air hole (14) is arranged at the bottom of the mounting groove. The sealing valve core block (34) is installed in the mounting groove in a floating manner, and a clearance fit is formed between the side wall of the sealing valve core block (34) and the side wall of the mounting groove.

4. The gas valve capable of real-time monitoring of valve sealing according to claim 3, characterized in that: The sealing valve core block (34) is sleeved with a spring sheet (341) on the outside, and the upper end of the spring sheet (341) is in tight contact with the side wall of the sealing valve core block (34), and the lower end of the spring sheet (341) is in tight contact with the bottom of the air cavity (42).

5. The gas valve capable of real-time monitoring of valve sealing according to claim 1, characterized in that: A valve cover (2) having an outer wall sealedly connected to the inner wall of the mounting notch is provided above the monitoring cavity diaphragm (31), and a valve stem (3) which can move upward and downward and whose lower end contacts the monitoring cavity diaphragm (31) is provided through the axial center of the valve cover (2).

6. The gas valve capable of real-time monitoring of valve sealing according to claim 5, characterized in that: The lower end surface of the valve cover (2) is arranged in contact with the monitoring cavity diaphragm (31).

7. The gas valve capable of real-time monitoring of valve sealing according to claim 5 or 6, characterized in that: The valve cover (2) and the valve stem (3) are connected by threaded fitting.

8. The gas valve capable of real-time monitoring of valve sealing according to claim 1, characterized in that: The low-pressure probe (52), the flat-pressure probe (53) and the high-pressure probe (54) are each provided with two.

9. The gas valve capable of real-time monitoring of valve sealing according to claim 1 or 8, characterized in that: A signal sending probe (51) extending outside the valve body (1) is provided on a side of the detector (5) away from the strain diaphragm (151).

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