Pilot operated safety valve with filtering and on-site testing function

Abstract

The present invention provides a pilot safety valve with filtering and on-site testing functions, and relates to the technical field of pressure relief valves. The present invention includes a pilot valve body, a main valve and a valve core, and has a filtering mechanism and a flow testing mechanism. The filtering mechanism includes a filter screen assembly and a sealing assembly movably installed therein. The side wall of the main valve is provided with a socket connected to the interior for embedding the filter screen assembly. The sealing assembly automatically switches to a first state when the liquid flows, blocks the gap between the filter screen assembly and the socket, and starts the flow testing mechanism; when the liquid stops flowing, it switches to a second state, removes the blockage so that the filter screen assembly can be removed and the flow testing mechanism is closed. The flow testing mechanism is located downstream of the filter screen assembly and is used to detect the liquid flow. This design realizes the integration of filtering function and flow testing function, facilitates operation, maintenance and testing, improves the sealing performance and operating efficiency of the system, and is suitable for fluid control and monitoring under complex working conditions.

Description

Technical Field

[0001] The invention relates to the technical field of pressure relief valves, and in particular to a pilot-operated safety valve with filtering and on-site testing functions. Background Art

[0002] At present, the pilot valve is a valve used to control the pressure, flow or direction in the fluid system. It is usually used as a control valve in the system to achieve the required control function by adjusting the fluid. The working principle of the pilot valve is to use an auxiliary control fluid to manipulate the flow of the main fluid. When the control signal (such as an electrical signal or a pressure signal) acts on the pilot valve, it changes the position of the valve core inside the pilot valve, thereby changing the working state of the main valve. Pilot valves are widely used in various industrial fields, including hydraulic systems, pneumatic systems, liquid handling systems, etc. They are able to provide precise control, so that the fluid system can be adjusted and operated as needed, thereby realizing automated production and process control.

[0003] During the manufacturing process of the pilot-operated safety valve, it is necessary to first test the size of the internal flow of the pilot-operated safety valve with filtering function, that is, it is necessary to measure the pilot-operated safety valve with filtering function to see whether the filtering function will affect the internal flow. If the impact is not significant, the filter can be installed inside the pilot-operated safety valve. If the impact is too large, it cannot be installed.

[0004] After research, the inventors found that when testing the pilot-operated safety valve with filtering function in the prior art, the pilot-operated safety valve needs to be disassembled and then the filter element is installed into the pilot-operated safety valve, which is very inconvenient during testing. Summary of the invention

[0005] In order to solve the problem of inconvenient testing of pilot-operated safety valves, the present application provides a pilot-operated safety valve with filtering and on-site testing functions.

[0006] The present application provides a pilot-operated safety valve with filtering and field testing functions, which adopts the following technical solutions:

[0007] A pilot safety valve with filtering and on-site testing functions, comprising a pilot valve body, a main valve and a valve core, and further comprising: a filtering mechanism, comprising a filter screen assembly and a sealing assembly, wherein the sealing assembly is movably installed in the filter screen assembly, a plug hole connected to the inside of the main valve is provided on the side wall of the main valve, the plug hole can be used for the filter screen assembly to be embedded in the main valve, and the sealing assembly can block the gap between the filter screen assembly and the plug hole after the filter screen assembly is embedded in the main valve; a flow testing mechanism, which is installed on the main valve and located at the downstream side of the filter screen assembly, and is used to detect the liquid flow through the filter screen assembly; wherein,

[0008] The sealing assembly has a switchable first state and a second state. When the liquid in the main valve flows, the sealing assembly automatically switches to the first state so that the sealing assembly blocks the gap between the filter screen assembly and the socket, and the flow testing mechanism is started at the same time. When the liquid in the main valve stops flowing, the sealing assembly automatically switches to the second state so that the sealing assembly no longer blocks the gap between the filter screen assembly and the socket, so as to facilitate the removal of the filter screen assembly from the socket, and the flow testing mechanism is closed at the same time.

[0009] Preferably, the filter screen assembly comprises an annular frame and a filter screen, the filter screen can be slidably arranged in the annular frame along the central axis direction of the annular frame, and the thickness of the annular frame is adapted to the width of the insertion hole.

[0010] Preferably, a docking groove is provided on the inner wall of the main valve away from the insertion hole, a magnet block is embedded in the docking groove, and the annular frame is an iron frame. When the annular frame is plugged into place, the magnet block and the annular frame can be magnetically fitted.

[0011] Preferably, an annular sliding bar is provided on the circumference of the filter screen, and a slot is provided on the inner wall of the annular frame, and the annular sliding bar is inserted into the slot; wherein, when liquid flows in the main valve, the filter screen is subjected to the flow pressure of the liquid and drives the annular sliding bar to move downward, so as to drive the sealing assembly to block the gap between the filter screen assembly and the socket, and at the same time start the flow testing mechanism.

[0012] Preferably, the sealing assembly includes a first airbag, a second airbag and a third airbag, the annular frame is provided with a first channel, a second channel and a third channel, the slot is further provided with a telescopic assembly, the telescopic assembly includes a vertical ring tube, a first spring and a vertical ring plate, the vertical ring plate is vertically arranged on the bottom wall of the slot, the vertical ring plate is vertically slidably inserted in the upper end opening of the vertical ring tube, the first spring is arranged in the vertical ring tube and always has a tendency to push the vertical ring plate vertically upward, the first channel is formed between the telescopic assembly and the inner side wall of the slot, The side of the first airbag is bonded to the first channel, the annular sliding bar is bonded to the end of the first airbag, and the annular sliding bar can press the end of the first airbag downward during the vertical downward movement to partially fold the first airbag; the third channel is vertically penetrated and opened in the annular frame and is away from the first channel, the second channel is opened in the annular frame and connects the first channel and the third channel, the openings at both ends of the third channel are expanded, and the two inner walls of the insertion hole on the main valve are provided with a receiving groove vertically facing the end expansion of the third channel; the third airbag is bonded to the third channel, and the two ends of the third airbag are located in the end expansion of the third channel, the second airbag is bonded to the second channel, and the two ends of the second airbag are respectively connected to the first airbag and the third airbag, and the interiors of the first airbag, the second airbag and the third airbag are in the same air pressure balance environment; wherein, when the liquid in the main valve flows, the annular sliding bar is subjected to the pressure generated by the liquid flow and overcomes the elastic force of the first spring and then moves downward, and the first airbag is pressed downward by the annular sliding bar When the third airbag is partially folded after the force is applied, the end of the third airbag is inflated under pressure and moves out from the end expansion of the third channel and is tightly attached to the accommodating groove to block the gap between the filter assembly and the socket, and the sealing assembly is in the first state at this time; when the liquid in the main valve stops flowing, the first spring drives the vertical ring plate to move vertically upward, so that the vertical ring plate pulls the end of the first airbag from the extruded and contracted state to the inflated state, and the end of the third airbag is compressed and contracted and moves back from the accommodating groove to the end expansion of the third channel, and the sealing assembly is in the second state.

[0013] Preferably, the bonding point between the second airbag and the second channel is a circumferential sealing bonding, so that the slot and the second channel are separated.

[0014] Preferably, the flow testing mechanism includes a battery and a turbine flowmeter, the battery is installed on the main valve and located below the annular frame, and the turbine flowmeter is installed on the main valve and located below the filter, and when the sealing assembly is in a first state, the battery is electrically connected to the turbine flowmeter, and when the sealing assembly is in a second state, the battery is disconnected from the turbine flowmeter.

[0015] Preferably, a vertical channel is provided in the side wall of the main valve and below the annular frame, the vertical channel is communicated with the accommodating groove below the annular frame, a moving rod is provided in the vertical channel for vertical sliding, a first conductive sheet is provided at the lower end of the moving rod and located in the vertical channel, the first conductive sheet is electrically connected to the battery, a second conductive sheet is provided at the inner bottom wall of the vertical channel, the second conductive sheet is electrically connected to the turbine flowmeter; side grooves are also provided on the side walls of the vertical channel, side blocks extending into the side grooves are provided on the moving rod, a second spring is provided between the side block and the inner end wall of the side groove, the second spring always has the function of pushing the moving rod vertically upwards trend so that the first conductive sheet is away from the second conductive sheet; wherein, when the sealing assembly is in the first state, the third airbag is inflated and pushes the moving rod, so that the moving rod overcomes the elastic force of the second spring after being pushed and moves vertically downward, driving the first conductive sheet and the second conductive sheet to fit together, so that the battery is electrically connected to the turbine flowmeter; when the sealing assembly is in the second state, the third airbag shrinks from the accommodating groove to the end expansion of the third channel and no longer applies a thrust to the moving rod. The moving rod moves vertically upward after being subjected to the elastic force of the second spring, and at this time, the first conductive sheet is separated from the second conductive sheet, so that the battery is disconnected from the turbine flowmeter.

[0016] The present invention has the following advantages and beneficial effects:

[0017] The present invention proposes a pilot safety valve with filtering and field testing functions. Through a unique structural design, the efficient integration of filtering function and flow test function is achieved, showing many beneficial effects. First, an embeddable filtering mechanism is adopted. By setting a socket on the side wall of the main valve and using the cooperation of the filter screen assembly and the sealing assembly, the filter assembly can be easily installed and disassembled without disassembling or modifying the main valve as a whole, which greatly simplifies the operation and maintenance process of the equipment and improves work efficiency. Secondly, the sealing assembly can automatically switch states according to the flow state of the liquid in the main valve. When the liquid flows, the sealing assembly switches to the first state to ensure that the gap between the filter screen assembly and the socket is effectively blocked, thereby avoiding fluid leakage, and at the same time starting the flow test mechanism to realize real-time detection of the flow; when the liquid stops flowing, the sealing assembly switches to the second state to release the blocking state, which is convenient for quickly removing the filter screen assembly for cleaning, replacement or maintenance. This automatic switching design not only reduces the complexity of manual intervention, but also reduces the risk of misoperation, and improves the safety and reliability of system operation. In addition, the flow test mechanism is installed downstream of the filter screen assembly, which can directly monitor the flow of the filtered liquid, providing intuitive data support on the impact of the filtering function on the fluid performance, and meeting the needs of on-site testing. The overall design is compact and highly integrated, which not only overcomes the shortcomings of the prior art that requires frequent disassembly and assembly, but also significantly improves the testing and maintenance efficiency, while ensuring the sealing performance and operational stability of the fluid system. The present invention provides an economical, efficient and reliable solution for fluid control and monitoring under complex working conditions, and has significant practical value and promotion prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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.

[0019] Figure 1 It is a schematic diagram of the structure of an embodiment of the present application;

[0020] Figure 2 This is a partial state diagram of the embodiment of the present application. Figure 1 , designed to show the state when there is no liquid flowing in the main valve;

[0021] Figure 3 yes Figure 2 A magnified view of part A in FIG.

[0022] Figure 4 This is a partial state diagram of the embodiment of the present application. Figure 2, designed to show the state when there is liquid flowing in the main valve;

[0023] Figure 5 yes Figure 4 Enlarged view of part B in .

[0024] The markings in the figure are:

[0025] 1. Pilot valve body; 2. Main valve; 21. Socket; 211. Receiving groove; 22. Docking groove; 221. Magnet block; 23. Vertical channel; 231. Side groove; 232. Second conductive sheet; 3. Valve core; 4. Filter mechanism; 41. Filter screen assembly; 411. Ring frame; 4111. Slot; 4112. First channel; 4113. Second channel; 4114. Third channel; 412. Filter screen; 413. Ring slide bar; 42. Sealing assembly; 421. First airbag; 422. Second airbag; 423. Third airbag; 5. Flow test mechanism; 51. Battery; 52. Turbine flowmeter; 6. Telescopic assembly; 61. Vertical ring tube; 62. First spring; 63. Vertical ring plate; 7. Moving rod; 71. Side block; 72. Second spring; 73. First conductive sheet. DETAILED DESCRIPTION

[0026] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0027] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0028] The pilot valve is a key control component widely used in the industrial field, which can accurately control the pressure, flow or fluid direction in the fluid system. It is usually used as a control valve to achieve stable operation and efficient control of industrial equipment or systems by adjusting fluid parameters. The basic working principle of the pilot valve is to use an auxiliary control fluid to drive the operation of the main body: when receiving a control signal (such as an electrical signal or a pressure signal), the pilot valve will change the position of its internal valve core, thereby adjusting the working state of the main valve and realizing flexible control of fluid parameters.

[0029] Existing pilot valves have been widely used in many fields such as hydraulic systems, pneumatic systems and liquid handling systems. Their core advantage is that they can provide precise control capabilities, allowing fluid systems to be flexibly adjusted and operated according to actual needs. This feature not only effectively improves the efficiency of automated production, but also significantly improves the accuracy and reliability of industrial processes.

[0030] In the field of safety control, pilot-operated safety valves, as a special type of pilot valve, undertake the key task of system overpressure protection. In recent years, with the increase in demand for industrial applications, the functional design of pilot-operated safety valves has been continuously expanded. Among them, the design of integrated filtering function can effectively reduce the interference of external particles on the main valve or control fluid while ensuring the reliable operation of the internal components of the safety valve. However, during the design process, how to evaluate the impact of the filtering function on the internal flow performance of the pilot-operated safety valve has become the focus of attention of technicians.

[0031] In actual production, the design of pilot-operated safety valves must undergo rigorous performance testing to ensure that all functions can meet application requirements. Among them, pilot-operated safety valves with filtering functions need to pay special attention to the impact of the design of the filter on the internal flow: if the filter has little impact on the flow, it can be directly integrated into the pilot-operated safety valve to achieve an organic combination of filtering and control functions; if the filter has too much impact on the flow, it is necessary to re-optimize the design or find alternative solutions to avoid system performance limitations.

[0032] However, the testing process in the existing technology has obvious limitations. The traditional testing method usually requires disassembling the pilot safety valve, temporarily installing the filter in the valve body, and then evaluating its performance. This method is not only time-consuming and labor-intensive, but also increases the risk of valve body damage due to frequent disassembly and assembly. At the same time, due to the complexity of the testing process, the test results may not be accurate, further affecting the efficiency and reliability of subsequent design improvements.

[0033] Through in-depth research on the prior art, the inventors found that the traditional pilot safety valve testing method has the following main disadvantages: The testing process is cumbersome: When testing a pilot safety valve with a filtering function, the safety valve needs to be disassembled and reassembled, which is complicated and time-consuming.

[0034] 1. Increased equipment loss: Frequent disassembly and assembly may cause wear of valve body components, increase maintenance costs and shorten equipment service life.

[0035] 2. Limited test accuracy: Due to the complexity of the test process, the test results may be biased, which is not conducive to the accurate evaluation of the filtering function.

[0036] 3. Inefficiency: Existing testing methods consume a lot of manpower and time resources and cannot meet the needs of rapid iterative design and mass production.

[0037] Based on the above defects, it can be seen that the existing technology lacks an efficient, convenient and accurate solution when testing the performance of pilot-operated safety valves with filtering functions, which seriously restricts the development and application promotion of related technologies.

[0038] Based on this, this application proposes a pilot safety valve with filtering and on-site testing functions. Figure 1~Figure 5 The pilot safety valve comprises a pilot valve body 1, a main valve 2, a valve core 3, a filter mechanism 4 and a flow test mechanism 5; wherein the pilot valve body 1 is connected to the main valve 2, and the valve core 3 is movably arranged in the air chamber of the main valve 2. Exemplarily, the filter mechanism 4 comprises a filter screen assembly 41 and a sealing assembly 42, wherein the sealing assembly 42 is movably installed in the filter screen assembly 41, and a plug hole 21 communicating with the inside of the main valve 2 is provided on the side wall of the main valve 2, wherein the plug hole 21 can be used for the filter screen assembly 41 to be embedded in the main valve 2, and the sealing assembly 42 can block the gap between the filter screen assembly 41 and the plug hole 21 after the filter screen assembly 41 is embedded in the main valve 2.

[0039] Exemplarily, the flow testing mechanism 5 is installed on the main valve 2 and is located on the downstream side of the filter screen assembly 41, and is used to detect the liquid flow passing through the filter screen assembly 41; wherein the sealing assembly 42 has a switchable first state and a second state, and when the liquid in the main valve 2 flows, the sealing assembly 42 automatically switches to the first state, so that the sealing assembly 42 blocks the gap between the filter screen assembly 41 and the socket 21, and the flow testing mechanism 5 is started at the same time; when the liquid in the main valve 2 stops flowing, the sealing assembly 42 automatically switches to the second state, so that the sealing assembly 42 no longer blocks the gap between the filter screen assembly 41 and the socket 21, so as to facilitate the removal of the filter screen assembly 41 from the socket 21, and the flow testing mechanism 5 is closed at the same time.

[0040] On this basis, after the filter screen assembly 41 is installed into the main valve 2 through the through hole, the sealing assembly 42 can block the gap between the filter screen assembly 41 and the plug hole 21, so that the filter screen assembly 41 can be stably and sealed installed in the main valve 2. At the same time, after the filter screen assembly 41 is installed in place, the pilot safety valve is started to allow the liquid in the pilot safety valve to flow. At this time, the sealing assembly 42 will automatically block the gap between the filter screen assembly 41 and the plug hole 21 under the action of the liquid, and the flow test mechanism 5 is also started synchronously, so that the flow test mechanism 5 can detect the liquid flow in the main valve 2 where the filter screen assembly 41 is installed. If the flow test mechanism 5 detects that the liquid flow in the main valve 2 after the filter screen assembly 41 is installed meets the requirements, it can be installed for a long time. If the flow testing mechanism 5 detects that the liquid flow does not meet the requirements, the filter screen assembly 41 needs to be removed. At this time, the pilot safety valve can be directly closed to stop the liquid in the pilot safety valve from flowing. At this time, the sealing assembly 42 automatically switches to the second state, so that the sealing assembly 42 no longer blocks the gap between the filter screen assembly 41 and the socket 21. In this way, the filter screen assembly 41 can be conveniently and directly removed from the socket 21. At this time, the flow testing mechanism 5 will also be automatically closed to avoid waste caused by running without detecting the flow.

[0041] In summary, when testing the pilot safety valve of the present application, it can be installed or removed simply and quickly according to the flow test results, and the filter assembly 41 is also very convenient to remove, and it is also convenient to install and it is not easy for the pilot safety valve to leak.

[0042] In some embodiments, Figure 2 , Figure 3 As shown, the filter assembly 41 includes an annular frame 411 and a filter screen 412. The filter screen 412 can be slidably arranged in the annular frame 411 along the central axis direction of the annular frame 411. The thickness of the annular frame 411 is adapted to the width of the insertion hole 21. Exemplarily, the filter screen 412 is a microporous filter screen 412, which allows the pilot safety valve to allow the liquid to pass normally when it is in an open state, while limiting the passage of impurities remaining in the liquid.

[0043] In this way, the filter screen 412 is installed by sliding along the central axis direction of the annular frame 411, so that the user can quickly replace or clean the filter screen 412 according to actual needs without disassembling the annular frame 411 or other components as a whole, thereby reducing the complexity and time consumption of maintenance operations. In addition, the design of the thickness of the annular frame 411 being adapted to the width of the socket 21 ensures the stability and sealing of the filter screen assembly 41 when it is embedded in the socket 21, and effectively prevents loosening or leakage problems caused by size mismatch. This optimized design not only improves the service life and reliability of the filter assembly, but also further enhances the sealing performance and operating efficiency of the entire pilot safety valve, providing a more efficient and convenient solution for fluid filtration and testing under complex working conditions in actual applications, reflecting excellent practical value and technical advantages.

[0044] In some embodiments, in combination Figure 2 A docking groove 22 is provided on the inner wall of the main valve 2 away from the insertion hole 21, and a magnet block 221 is embedded in the docking groove 22. The annular frame 411 is an iron frame. When the annular frame 411 is plugged in place, the magnet block 221 and the annular frame 411 can be magnetically attached. In this way, both ends of the installed annular frame 411 can be protected by limited position, that is, when the liquid flows, the annular frame 411 can be stably placed in the main valve 2 by limiting the docking groove 22 and the insertion hole 21. At the same time, the magnetic adsorption of the magnet block 221 and the annular frame 411 can make part of the annular frame 411 more stably placed in the docking groove 22.

[0045] In some embodiments, Figure 4 , Figure 5 As shown, an annular sliding bar 413 is provided on the circumference of the filter screen 412, and a slot 4111 is provided on the inner wall of the annular frame 411, and the annular sliding bar 413 is inserted into the slot 4111; wherein, when the liquid in the main valve 2 flows, the filter screen 412 is driven by the flow pressure of the liquid to drive the annular sliding bar 413 to move downward, so as to drive the sealing component 42 to block the gap between the filter screen component 41 and the socket 21, and at the same time, the flow test mechanism 5 is started.

[0046] Exemplary, combined Figure 2~Figure 5The sealing assembly 42 includes a first airbag 421, a second airbag 422 and a third airbag 423. The annular frame 411 is provided with a first channel 4112, a second channel 4113 and a third channel 4114. The slot 4111 is also provided with a telescopic assembly 6. The telescopic assembly 6 includes a vertical ring tube 61, a first spring 62 and a vertical ring plate 63. The vertical ring plate 63 is vertically arranged on the bottom wall of the slot 4111. The vertical ring plate 63 is vertically slidably inserted into the upper end opening of the vertical ring tube 61. The first spring 62 is arranged in the vertical ring tube 61 and always has the tendency to push the vertical ring plate 63 vertically upward. The first channel 4112 is formed between the telescopic component 6 and the inner wall of the slot 4111. The side of the first airbag 421 is bonded to the first channel 4112. The annular sliding bar 413 is bonded to the end of the first airbag 421, and the annular sliding bar 413 can press the end of the first airbag 421 downward during the vertical downward movement to partially fold the first airbag 421.

[0047] Exemplarily, the third channel 4114 is vertically penetrated through the annular frame 411 and is away from the first channel 4112, the second channel 4113 is opened in the annular frame 411 and connects the first channel 4112 and the third channel 4114, the openings at both ends of the third channel 4114 are expanded, and the main valve 2 is provided with a receiving groove 211 on the two inner walls of the socket 21, which is vertically opposite to the end expansion of the third channel 4114.

[0048] Exemplarily, the third airbag 423 is bonded to the third channel 4114, and both ends of the third airbag 423 are located in the end expansion of the third channel 4114, the second airbag 422 is bonded to the second channel 4113, and both ends of the second airbag 422 are connected to the first airbag 421 and the third airbag 423 respectively, and the interiors of the first airbag 421, the second airbag 422 and the third airbag 423 are in the same air pressure balance environment.

[0049] Exemplary, combined Figure 2~Figure 5 When the liquid in the main valve 2 flows, the annular sliding bar 413 moves downward after being subjected to the pressure generated by the liquid flow and overcoming the elastic force of the first spring 62. When the first airbag 421 is partially folded after being subjected to the downward pressure of the annular sliding bar 413, the end of the third airbag 423 is pressurized and inflated and moves out from the end expansion of the third channel 4114 and tightly adheres to the accommodating groove 211 to block the gap between the filter assembly 41 and the plug hole 21. At this time, the sealing assembly 42 is in the first state; when the liquid in the main valve 2 stops flowing, the first spring 62 drives the vertical ring plate 63 to move vertically upward, so that the vertical ring plate 63 pulls the end of the first airbag 421 from the squeezed and contracted state to the inflated state. At this time, the end of the third airbag 423 is pressurized and contracted and moves back from the accommodating groove 211 to the end expansion of the third channel 4114. At this time, the sealing assembly 42 is in the second state.

[0050] On this basis, when the liquid in the main valve 2 flows, the pressure brought by the liquid impacting the filter screen 412 will drive the annular sliding bar 413 to move downward. At this time, the annular sliding bar 413 will squeeze the first air bag 421, causing the first air bag 421 in the inflated state to be squeezed, deformed and shrunk. Since the first air bag 421, the second air bag 422 and the third air bag 423 are in a state of air pressure balance and connection, the first air bag 421 is squeezed and deformed, and the air pressure in the first air bag 421 will enter the two ends of the third air bag 423 through the second air bag 422, forcing the two ends of the third air bag 423 to gradually inflate from a contracted state. When the third air bag 423 is inflated, the third air bag 423 will enter the receiving groove 211 and fill the receiving groove 211 to block the gap between the filter screen assembly 41 and the socket 21. At this time, the sealing assembly 42 is in the first state. Similarly, after the liquid in the main valve 2 flows temporarily, the filter screen 412 is no longer subjected to the impact force of the liquid. At this time, the first spring 62 will drive the annular sliding bar 413 to move upward, thereby allowing the first airbag 421 to always remain in an inflated state. Due to the air pressure balance principle, after the first airbag 421 is inflated, the corresponding third airbag 423 will shrink again, thereby allowing the third airbag 423 to shrink and deform and shrink within the end expansion of the third channel 4114. At this time, the sealing component 42 is in the second state. Therefore, it is only necessary to allow the liquid in the main valve 2 to flow and stagnate to control the gap between the filter screen component 41 and the jack 21 to be blocked or separated, so that the main valve 2 can remain sealed during operation, and the filter screen component 41 can be easily removed when not in operation, thereby improving installation and removal efficiency.

[0051] In some embodiments, in combination Figure 3 , Figure 5 The bonding point between the second airbag 422 and the second channel 4113 is circumferentially sealed to separate the slot 4111 and the second channel 4113. This can prevent the liquid in the main valve 2 from entering the second channel 4113 to a certain extent, thereby improving the sealing performance.

[0052] In some embodiments, reference Figure 2 , Figure 4 The flow testing mechanism 5 includes a battery 51 and a turbine flowmeter 52. The battery 51 is installed on the main valve 2 below the annular frame 411, and the turbine flowmeter 52 is installed on the main valve 2 below the filter screen 412. When the sealing assembly 42 is in the first state, the battery 51 is electrically connected to the turbine flowmeter 52. When the sealing assembly 42 is in the second state, the battery 51 is disconnected from the turbine flowmeter 52.

[0053] For example, refer to Figure 3 , Figure 5A vertical channel 23 is provided in the side wall of the main valve 2 and below the annular frame 411. The vertical channel 23 is communicated with the accommodating groove 211 below the annular frame 411. A moving rod 7 is vertically slidably provided in the vertical channel 23. A first conductive sheet 73 is provided at the lower end of the moving rod 7 and located in the vertical channel 23. The first conductive sheet 73 is electrically connected to the battery 51. A second conductive sheet 232 is provided at the inner bottom wall of the vertical channel 23. The second conductive sheet 232 is electrically connected to the turbine flowmeter 52.

[0054] Exemplarily, a side groove 231 is also provided on the side wall of the vertical channel 23, and a side block 71 extending into the side groove 231 is provided on the moving rod 7. A second spring 72 is provided between the side block 71 and the inner end wall of the side groove 231. The second spring 72 always has a tendency to push the moving rod 7 vertically upward to keep the first conductive sheet 73 away from the second conductive sheet 232.

[0055] Among them, when the sealing assembly 42 is in the first state, the third airbag 423 is inflated and pushes the moving rod 7, so that the moving rod 7 overcomes the elastic force of the second spring 72 after being pushed and moves vertically downward, driving the first conductive sheet 73 and the second conductive sheet 232 to fit together, so that the battery 51 and the turbine flowmeter 52 are electrically connected; when the sealing assembly 42 is in the second state, the third airbag 423 shrinks from the accommodating groove 211 to the end expansion of the third channel 4114 and no longer applies thrust to the moving rod 7. The moving rod 7 moves vertically upward after being subjected to the elastic force of the second spring 72. At this time, the first conductive sheet 73 is separated from the second conductive sheet 232, so that the battery 51 and the turbine flowmeter 52 are disconnected.

[0056] After such arrangement, when the liquid in the main valve 2 flows, the third airbag 423 located below expands, which pushes the moving rod 7 to move vertically downward, thereby driving the first conductive sheet 73 to fit with the second conductive sheet 232. At this time, the battery 51 is electrically connected to the turbine flowmeter 52. After the first conductive sheet 73 and the second conductive sheet 232 are electrically fitted, the turbine flowmeter 52 can be started to detect the downstream liquid flow after the filter 412 is installed. When the liquid in the main valve 2 no longer flows, the third airbag 423 located below contracts and no longer squeezes the moving rod 7. The moving rod 7 moves vertically upward under the rebound action of the second spring 72. At this time, the first conductive sheet 73 and the second conductive sheet 232 are separated, and the turbine flowmeter 52 is disconnected. In this way, the turbine flowmeter 52 can be automatically started when the liquid in the main valve 2 flows, and the turbine flowmeter 52 will automatically close when the liquid in the main valve 2 does not flow, thereby achieving the effect of intelligence and power saving, thereby avoiding the situation where the turbine flowmeter 52 is running when there is no liquid flowing in the main valve 2.

[0057] Exemplarily, in order to improve the fitting effect between the first conductive sheet 73 and the second conductive sheet 232, a rubber ring is provided on the inner bottom wall of the vertical channel 23 and below the second conductive sheet 232. The rubber ring can elastically deform after the second conductive sheet 232 is squeezed to adapt to the fitting of the first conductive sheet 73 and the second conductive sheet 232.

[0058] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A pilot-operated safety valve with filtering and field testing functions, comprising a pilot-operated valve body (1), a main valve (2) and a valve core (3), characterized in that: Also includes: The filter mechanism (4) comprises a filter screen assembly (41) and a sealing assembly (42), wherein the sealing assembly (42) is movably mounted in the filter screen assembly (41), a plug hole (21) communicating with the interior of the main valve (2) is provided on the side wall of the main valve (2), the plug hole (21) allows the filter screen assembly (41) to be embedded in the main valve (2), and the sealing assembly (42) can block the gap between the filter screen assembly (41) and the plug hole (21) after the filter screen assembly (41) is embedded in the main valve (2); The flow testing mechanism (5) is installed on the main valve (2) and is located on the downstream side of the filter screen assembly (41), and is used to detect the flow of liquid passing through the filter screen assembly (41); wherein: The sealing component (42) has a switchable first state and a second state. When the liquid in the main valve (2) flows, the sealing component (42) automatically switches to the first state so that the sealing component (42) blocks the gap between the filter assembly (41) and the socket (21), and the flow test mechanism (5) is started at the same time. When the liquid in the main valve (2) stops flowing, the sealing component (42) automatically switches to the second state so that the sealing component (42) no longer blocks the gap between the filter assembly (41) and the socket (21), so that the filter assembly (41) can be easily removed from the socket (21), and the flow test mechanism (5) is closed at the same time.

2. The pilot operated safety valve with filtering and field testing functions according to claim 1 is characterized in that: The filter screen assembly (41) comprises an annular frame (411) and a filter screen (412); the filter screen (412) can be slidably disposed in the annular frame (411) along the central axis direction of the annular frame (411); the thickness of the annular frame (411) is adapted to the width of the insertion hole (21).

3. The pilot operated safety valve with filtering and on-site testing functions according to claim 2 is characterized in that: A docking groove (22) is provided on the inner side wall of the main valve (2) away from the insertion hole (21), and a magnet block (221) is embedded in the docking groove (22). The annular frame (411) is an iron frame. When the annular frame (411) is plugged into place, the magnet block (221) and the annular frame (411) can be magnetically attached.

4. The pilot operated safety valve with filtering and on-site testing functions according to claim 2 is characterized in that: An annular sliding bar (413) is provided in the circumferential direction of the filter screen (412), a slot (4111) is provided on the inner side wall of the annular frame (411), and the annular sliding bar (413) is inserted into the slot (4111); wherein: When the liquid in the main valve (2) flows, the filter screen (412) is subjected to the flow pressure of the liquid and drives the annular sliding bar (413) to move downward, thereby driving the sealing component (42) to block the gap between the filter screen component (41) and the plug hole (21), and at the same time starting the flow test mechanism (5).

5. The pilot operated safety valve with filtering and on-site testing functions according to claim 4 is characterized in that: The sealing assembly (42) comprises a first airbag (421), a second airbag (422) and a third airbag (423); a first channel (4112), a second channel (4113) and a third channel (4114) are provided in the annular frame (411); a telescopic assembly (6) is further provided in the slot (4111); the telescopic assembly (6) comprises a vertical ring tube (61), a first spring (62) and a vertical ring plate (63); the vertical ring plate (63) is vertically arranged on the bottom wall of the slot (4111); the vertical ring plate (63) is vertically slidably inserted into the upper end opening of the vertical ring tube (61). The first spring (62) is arranged in the vertical ring tube (61) and always has the tendency to push the vertical ring plate (63) vertically upwards, the first channel (4112) is formed between the telescopic component (6) and the inner side wall of the slot (4111), the side of the first airbag (421) is bonded to the first channel (4112), the annular sliding bar (413) is bonded to the end of the first airbag (421), and the annular sliding bar (413) can press the end of the first airbag (421) downwards during the vertical downward movement, so that the first airbag (421) is partially folded; The third channel (4114) is vertically penetrated and opened in the annular frame (411) and is away from the first channel (4112); the second channel (4113) is opened in the annular frame (411) and is connected to the first channel (4112) and the third channel (4114); the openings at both ends of the third channel (4114) are expanded, and the two inner walls of the insertion hole (21) on the main valve (2) are provided with a receiving groove (211) vertically facing the expanded end of the third channel (4114); The third airbag (423) is bonded to the third channel (4114), and both ends of the third airbag (423) are located in the end expansion of the third channel (4114). The second airbag (422) is bonded to the second channel (4113), and both ends of the second airbag (422) are respectively connected to the first airbag (421) and the third airbag (423). The interiors of the first airbag (421), the second airbag (422) and the third airbag (423) are in the same air pressure balance environment; wherein, When liquid flows in the main valve (2), the annular sliding bar (413) is subjected to the pressure generated by the liquid flow and overcomes the elastic force of the first spring (62) and moves downward. When the first airbag (421) is subjected to the downward pressure of the annular sliding bar (413) and is partially folded, the end of the third airbag (423) is inflated by pressure and moves out from the end of the third channel (4114) and is tightly attached to the receiving groove (211), so as to close the filter assembly (41) and the plug hole (21). The gap is blocked, and the sealing assembly (42) is in the first state. When the liquid in the main valve (2) stops flowing, the first spring (62) drives the vertical ring plate (63) to move vertically upward, so that the vertical ring plate (63) pulls the end of the first airbag (421) from the squeezed and contracted state to the inflated state. At this time, the end of the third airbag (423) is compressed and contracted and moves back from the accommodating groove (211) to the end expansion of the third channel (4114). At this time, the sealing assembly (42) is in the second state.

6. The pilot operated safety valve with filtering and on-site testing functions according to claim 5, characterized in that: The bonding point between the second airbag (422) and the second channel (4113) is a circumferential sealing bonding, so as to separate the slot (4111) and the second channel (4113).

7. The pilot operated safety valve with filtering and on-site testing functions according to claim 5, characterized in that: The flow testing mechanism (5) comprises a battery (51) and a turbine flowmeter (52); the battery (51) is mounted on the main valve (2) and is located below the annular frame (411); the turbine flowmeter (52) is mounted on the main valve (2) and is located below the filter screen (412); when the sealing assembly (42) is in a first state, the battery (51) is electrically connected to the turbine flowmeter (52); when the sealing assembly (42) is in a second state, the battery (51) is disconnected from the turbine flowmeter (52).

8. The pilot operated safety valve with filtering and on-site testing functions according to claim 7, characterized in that: A vertical channel (23) is provided in the side wall of the main valve (2) and below the annular frame (411); the vertical channel (23) is connected to the accommodating groove (211) below the annular frame (411); a moving rod (7) is provided in the vertical channel (23) for vertical sliding; a first conductive sheet (73) is provided at the lower end of the moving rod (7) and in the vertical channel (23); the first conductive sheet (73) is electrically connected to the battery (51); a second conductive sheet (232) is provided at the inner bottom wall of the vertical channel (23); the second conductive sheet (232) is electrically connected to the turbine flowmeter (52); A side groove (231) is further provided on the side wall of the vertical channel (23); a side block (71) extending into the side groove (231) is provided on the moving rod (7); a second spring (72) is provided between the side block (71) and the inner end wall of the side groove (231); the second spring (72) always has a tendency to push the moving rod (7) vertically upwards so as to keep the first conductive sheet (73) away from the second conductive sheet (232); wherein: When the sealing assembly (42) is in the first state, the third airbag (423) is inflated and pushes the moving rod (7), so that the moving rod (7) overcomes the elastic force of the second spring (72) and moves vertically downward, driving the first conductive sheet (73) to fit the second conductive sheet (232), so that the battery (51) is electrically connected to the turbine flowmeter (52); When the sealing assembly (42) is in the second state, the third airbag (423) no longer applies thrust to the moving rod (7) after shrinking from the accommodating groove (211) into the end expansion of the third channel (4114). The moving rod (7) moves vertically upward under the elastic force of the second spring (72). At this time, the first conductive sheet (73) is separated from the second conductive sheet (232), so that the battery (51) is disconnected from the turbine flowmeter (52).

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