Shock-resistant and impact-resistant pilot-operated type electromagnetic drive stop valve

Abstract

According to the shock-resistant and impact-resistant pilot-operated type electromagnetic drive stop valve, a guide sleeve is arranged, an inclined guide face is formed on the peripheral face of a sleeve body of the guide sleeve, and the guide face gradually gets close to a main valve element from a limiting part to the lower end face of the sleeve body; when fluid flows through the guide sleeve, the guide surface can play a good role in guiding the fluid, the fluid is effectively guided to smoothly bypass the guide sleeve, the flow resistance is small, the local resistance and energy loss of the fluid are remarkably reduced, the flow resistance coefficient of the stop valve is greatly reduced on the whole, and the service life of the stop valve is prolonged. And large-range flow separation and vortex are prevented from being generated at the guide sleeve, so that the flow stability of the stop valve is ensured, and the measurement precision of the stop valve is improved. The inclined angle of the guide face ranges from 15 degrees to 30 degrees, a good guide function can be guaranteed, meanwhile, the optimal streamline flow guide effect can be achieved, and fluid dynamic analysis and experimental test verification show that the flow resistance can be reduced by 20% to 30%.

Description

Technical Field

[0001] This application relates to the field of solenoid valve technology, and in particular to a shock-resistant and impact-resistant pilot-operated electromagnetic shut-off valve. Background Technology

[0002] In media control systems, gate valves are critical equipment whose performance directly affects energy efficiency and system stability. Especially in the nuclear power field, the special characteristics of the transported media and the limitations of operating conditions place higher demands on the sealing performance, safety, and measurement accuracy of gate valves. In existing technologies, flow separation and vortex zones easily occur when the medium enters the valve body from the inflow channel. Particularly in the inflow channel region, significant backflow occurs after the medium comes into contact with internal valve components. This backflow forms turbulence on the guide sleeve side, and the vortex zone causes some of the medium to flow in the opposite direction and interfere with the main flow, intensifying the turbulence. This not only results in high overall flow resistance and energy consumption for the gate valve but also leads to unstable flow and decreased measurement accuracy. Summary of the Invention

[0003] To address the aforementioned technical problems, this application provides a shock-resistant and impact-resistant pilot-operated electromagnetic shut-off valve, comprising a valve body, a coil housing, a coil, a stationary iron core, a moving iron core, a valve stem, a first spring, a second spring, a guide sleeve, a pressure ring, a guide ring, a pilot valve core, a main valve core, and a heat insulation and heat dissipation assembly.

[0004] The valve body is provided with an interconnected medium inflow channel and an outflow channel; one end of the heat insulation and heat dissipation assembly is disposed within the valve body, and the other end is disposed within the coil housing; the coil is disposed within the coil housing; the stationary iron core is sleeved within the coil; the valve stem is movably inserted through the stationary iron core, and a movable iron core is disposed at its lower end; the first spring is sleeved on the valve stem, and its lower end abuts against the top of the movable iron core; the pressure ring is disposed within the heat insulation and heat dissipation assembly; the guide sleeve includes a sleeve body and a limiting part disposed on the outer circumferential surface of the sleeve body; the upper end of the sleeve body is sleeved within the heat insulation and heat dissipation assembly, and the upper end surface of the limiting part is flush with the heat insulation and heat dissipation assembly. The lower end face abuts against the main valve core; the outer peripheral surface of the sleeve body at the lower part of the limiting part forms an inclined guide surface; from the limiting part to the lower end face of the sleeve body, the guide surface gradually approaches the main valve core; the guide ring and the main valve core are arranged sequentially from top to bottom in the guide sleeve; the second spring is arranged between the pressure ring and the guide ring; the moving iron core passes through the heat insulation and heat dissipation component, the pressure ring and the guide ring, and a pilot valve core is provided at its lower end; the main valve core is provided with a first pressure relief channel and a second pressure relief channel; a sealing protrusion is formed at the end of the pilot valve core, and when the shut-off valve is in the normally closed state, the sealing protrusion can be inserted into the second pressure relief channel to seal the second pressure relief channel.

[0005] In some embodiments of this application, the guide surface of the guide sleeve makes an angle of 15° to 30° with the axial direction.

[0006] In some embodiments of this application, the outer peripheral surface of the main valve core forms a first inclined surface and a second inclined surface; the first inclined surface is located above the first pressure relief channel; the second inclined surface is located below the first pressure relief channel; and a third inclined surface adapted to the second inclined surface is formed on the valve body.

[0007] In some embodiments of this application, the sealing protrusion is frustoconical, and the second pressure relief channel includes a tapered channel adapted to the sealing protrusion.

[0008] In some embodiments of this application, the heat insulation and heat dissipation assembly includes a heat dissipation sleeve and a heat insulation sleeve fitted inside the heat dissipation sleeve; the outer periphery of the heat insulation sleeve is provided with a plurality of flow guide grooves arranged at intervals along the axial direction; the outer periphery of the heat dissipation sleeve is provided with a plurality of fins arranged at intervals along the axial direction.

[0009] In some embodiments of this application, a magnetorheological fluid damper is also included, which is disposed on the moving iron core and located above the pilot valve core.

[0010] In some embodiments of this application, a guide spindle is provided inside the moving iron core along the direction of movement of the moving iron core, and the top end of the guide spindle extends out of the moving iron core and abuts against the lower end of the stationary iron core.

[0011] In some embodiments of this application, Stellite alloy is overlaid on the third inclined surface of the valve body, and the weld layer thickness is 3.5 mm.

[0012] In some embodiments of this application, a valve stem sleeve is fitted on the outer side of the valve stem, and a permanent magnet is provided on the top; a sensor mounting base is fitted on the outer side of the valve stem sleeve; and multiple position sensors are arranged circumferentially around the inner side of the sensor mounting base.

[0013] In some embodiments of this application, the position sensor is provided with a third spring at its lower part and an adjusting screw at its upper part.

[0014] Compared with the prior art, the present invention has the following advantages and beneficial effects: The shock-resistant and impact-resistant pilot-operated electromagnetic shut-off valve of this application, by setting a guide sleeve, forms an inclined guide surface on the outer circumferential surface of the sleeve body, and from the limiting part to the lower end face of the sleeve body, the guide surface gradually approaches the main valve core. When the fluid flows through the guide sleeve, the guide surface can play a good guiding role for the fluid, effectively guiding the fluid to smoothly bypass the guide sleeve, with low flow resistance, significantly reducing the local resistance and energy loss of the fluid, and greatly reducing the overall flow resistance coefficient of the shut-off valve, avoiding the generation of large-scale flow separation and eddies at the guide sleeve, thereby ensuring the flow stability of the shut-off valve and improving the measurement accuracy of the shut-off valve. The inclination angle of the guide surface is between 15° and 30°, which not only ensures good guiding function, but also achieves the best streamlined guiding effect. Fluid dynamics analysis and experimental testing have verified that the flow resistance can be reduced by 20% to 30%.

[0015] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory, and do not limit this document. Attached Figure Description

[0016] The accompanying drawings, which form part of this document, are used to provide a further understanding of the document. The illustrative embodiments and descriptions herein are used to explain the document and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a cross-sectional view of the shock-resistant and impact-resistant pilot-operated electromagnetic shut-off valve in the closed state provided in an exemplary embodiment of this application; Figure 2 yes Figure 1 A magnified view within the dashed box; Figure 3 This is a schematic diagram of the structure of a shock-resistant and impact-resistant pilot-operated electromagnetic shut-off valve provided in an exemplary embodiment of this application; Figure 4 This is a schematic diagram of the structure of the guide sleeve provided in an exemplary embodiment of this application; Figure 5 This is a schematic diagram of the structure of a coil provided in an exemplary embodiment of this application; Figure 6 This is a schematic diagram of the structure of a valve position indicator provided in an exemplary embodiment of this application; Figure 7 This is a cross-sectional view of the shock-resistant and impact-resistant pilot-operated electromagnetic shut-off valve in the open state, provided in an exemplary embodiment of this application.

[0017] In the picture: 1. Valve body; 101. Inflow channel; 102. Outflow channel; 103. Valve cover; 2. Coil housing; 3. Coil; 4. Stationary iron core; 5. Moving iron core; 6. Valve stem; 7. First spring; 8. Second spring; 9. Guide sleeve; 901. Sleeve body; 902. Limiting part; 903. Guide surface; 10. Pressure ring; 11. Guide ring; 12. Pilot valve core; 1201. Sealing protrusion; 13. Main valve core; 1301. First leakage... 1302. Pressure relief channel; 1303. First inclined surface; 1304. Second inclined surface; 14. Heat insulation sleeve; 15. Heat dissipation sleeve; 16. Heat insulation pad; 17. Guide spindle; 18. Magnetic shielding tube; 19. Magnetic shielding ring; 20. Magnetic guide ring; 21. Magnetic distribution ring; 22. Nut; 23. Sensor mounting base; 24. Valve stem sleeve; 25. Position sensor; 26. Third spring; 27. Adjusting screw; 28. Permanent magnet. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be arbitrarily combined with each other.

[0019] In media control systems, gate valves are critical equipment whose performance directly affects energy efficiency and system stability. Especially in the nuclear power field, the special characteristics of the transported media and the limitations of operating conditions place higher demands on the sealing performance, safety, and measurement accuracy of gate valves. In existing technologies, flow separation and vortex zones easily occur when the medium enters the valve body from the inflow channel. Particularly in the inflow channel region, significant backflow occurs after the medium comes into contact with internal valve body components. This backflow forms turbulence on the guide sleeve side, and the vortex zone causes some of the medium to flow in the opposite direction and interfere with the main flow, intensifying the turbulence. This not only results in high overall flow resistance and energy consumption for the gate valve but also leads to unstable flow and decreased measurement accuracy.

[0020] Based on this, an exemplary embodiment of this application provides a shock-resistant and impact-resistant pilot-operated electromagnetic shut-off valve. By providing a guide sleeve, the outer circumferential surface of the sleeve body forms an inclined guide surface, and from the limiting part to the lower end face of the sleeve body, the guide surface gradually approaches the main valve core. When fluid flows through the guide sleeve, the guide surface effectively guides the fluid, smoothly guiding it around the guide sleeve. This results in low flow resistance, significantly reducing local resistance and energy loss, and substantially lowering the overall flow resistance coefficient of the shut-off valve. It also avoids large-scale flow separation and eddies at the guide sleeve, thereby ensuring stable flow and improving the measurement accuracy of the shut-off valve. The inclination angle of the guide surface is between 15° and 30°, which not only ensures good guiding function but also achieves optimal streamlined flow guidance. Fluid dynamics analysis and experimental testing have verified that the flow resistance can be reduced by 20% to 30%.

[0021] An exemplary embodiment of this application provides a shock-resistant and impact-resistant pilot-operated electromagnetic shut-off valve, such as... Figures 1 to 7 As shown, the shut-off valve includes a valve body 1, a coil housing 2, a coil 3, a stationary iron core 4, a moving iron core 5, a valve stem 6, a first spring 7, a second spring 8, a guide sleeve 9, a pressure ring 10, a guide ring 11, a pilot valve core 12, a main valve core 13, and a heat insulation and heat dissipation assembly.

[0022] The valve body 1 is provided with a medium inflow channel 101 and an outflow channel 102 that are interconnected. The medium flows into the shut-off valve from the inflow channel 101 and flows out from the outflow channel 102. The valve body 1 is provided with a valve cover 103. One end of the heat insulation and heat dissipation assembly is located inside the valve body 1, and the other end is located inside the coil housing 2. The coil 3 is located inside the coil housing 2. The stationary iron core 4 is sleeved inside the coil 3. The valve stem 6 is movably inserted inside the stationary iron core 4, and a moving iron core 5 is provided at its lower end. A magnetic ring 21 is embedded at the lower end of the stationary iron core 4. A magnetic conducting ring 20 is provided between the outer periphery of the stationary iron core 4 and the coil 3. A magnetic shielding tube 18 is also sleeved on the moving iron core 5, and a magnetic shielding ring 19 is provided outside the magnetic shielding tube. The first spring 7 is sleeved on the valve stem 6, and its lower end abuts against the top of the moving iron core 5. The pressure ring 10 is located inside the heat insulation and heat dissipation assembly.

[0023] In media control systems, gate valves are critical equipment whose performance directly affects energy efficiency and system stability. Especially in the nuclear power field, the special characteristics of the transported media and the limitations of operating conditions place higher demands on the sealing performance, safety, and measurement accuracy of gate valves. In existing technologies, flow separation and vortex zones easily occur when the medium enters the valve body from the inflow channel. Particularly in the inflow channel region, significant backflow occurs after the medium comes into contact with internal valve components. This backflow forms turbulence on the guide sleeve side, and the vortex zone causes some of the medium to flow in the opposite direction and interfere with the main flow, intensifying the turbulence. This not only results in high overall flow resistance and energy consumption for the gate valve but also leads to unstable flow and decreased measurement accuracy.

[0024] like Figures 2 to 4 As shown, in this application, the guide sleeve 9 includes a sleeve body 901 and a limiting part 902 provided on the outer peripheral surface of the sleeve body 901; the upper end of the sleeve body 901 is sleeved in the heat insulation and heat dissipation assembly, and the upper end surface of the limiting part 902 abuts against the lower end surface of the heat insulation and heat dissipation assembly; an inclined guide surface 903 is formed on the outer peripheral surface of the sleeve body 901 below the limiting part 902; from the limiting part 902 to the lower end surface of the sleeve body 901, the guide surface 903 gradually approaches the main valve core 13. In this application, the outer peripheral surface of the sleeve body 901 of the guide sleeve 9 forms an inclined guide surface 903, and from the limiting part 902 to the lower end face of the sleeve body 901, the guide surface 903 gradually approaches the main valve core 13. Thus, when the fluid flows through the guide sleeve 9, the guide surface 903 can play a good guiding role for the fluid, effectively guiding the fluid to smoothly bypass the guide sleeve 9, resulting in low flow resistance, significantly reducing the local resistance and energy loss of the fluid, and greatly reducing the overall flow resistance coefficient of the shut-off valve. This avoids the generation of large-scale flow separation and eddies at the guide sleeve 9, thereby ensuring the flow stability of the shut-off valve, improving the measurement accuracy of the shut-off valve, and reducing energy consumption.

[0025] In this application, by designing the guide sleeve 9 located at the inflow channel 101 with low flow resistance, the flow resistance of the shut-off valve is effectively reduced, thereby improving the measurement accuracy of the shut-off valve. Although the improvement in this application appears relatively simple in structure, this is precisely the core of the improvement. Through simple structural modifications, a significant improvement in performance is achieved; that is, in this application, the structural modification of the guide sleeve 9 results in low modification costs and can significantly improve the measurement accuracy of the shut-off valve while saving energy.

[0026] Preferably, the angle between the guide surface 903 of the guide sleeve 9 and the axial direction is 15° to 30°. If the angle is too small, the flow guiding effect will be insignificant; if the angle is too large, the guiding function may be weakened or the axial dimension of the shut-off valve may be increased due to the excessive flatness of the guide surface 903. In this application, the angle of the guide surface 903 is between 15° and 30°, which not only ensures the good guiding function of the guide sleeve 9, but also achieves the best streamlined flow guiding effect. Fluid dynamics analysis and experimental testing have verified that the flow resistance can be reduced by 20% to 30%.

[0027] The guide ring 11 and the main valve core 13 are arranged sequentially from top to bottom inside the guide sleeve 9; the second spring 8 is located between the pressure ring 10 and the guide ring 11; the moving iron core 5 passes through the heat insulation and heat dissipation component, the pressure ring 10 and the guide ring 11, and a pilot valve core 12 is provided at its lower end; the main valve core 13 is provided with a first pressure relief channel 1301 and a second pressure relief channel 1302; a sealing protrusion 1201 is formed at the end of the pilot valve core 12. When the shut-off valve is in the normally closed state, the sealing protrusion 1201 can be inserted into the second pressure relief channel 1302 to seal the second pressure relief channel 1302.

[0028] In this application, the opening process of the shut-off valve is as follows: When coil 3 is energized, it generates electromagnetic force, driving the moving iron core 5 to move the pilot valve core 12 upwards against the resistance of the first spring 7, thus opening the pilot valve core 12. At this time, the pilot valve core 12 and the main valve core 13 separate, and the first pressure relief channel 1301 and the second pressure relief channel 1302 form a rapid pressure relief channel. Under the combined action of electromagnetic pull and medium pressure difference, the main valve core 13 moves upwards until the stationary iron core 4 and the moving iron core 5 are fully attracted, achieving the fully open state of the shut-off valve. At this time, the medium can smoothly flow in from the inflow channel 101 and out from the outflow channel 102.

[0029] In the nuclear power field, the stroke of a shut-off valve is typically greater than that of a conventional valve. For example, the stroke of a conventional valve is generally 1mm-2mm, while the stroke of a shut-off valve in the nuclear power field can reach 5mm. To reduce the risk of resonance or misalignment of the moving iron core 5 under seismic conditions, preferably, in this application, a guide mandrel 17 is provided inside the moving iron core 5 along its direction of movement. The top end of the guide mandrel 17 extends out of the moving iron core 5 and abuts against the lower end of the stationary iron core 4. The length of the guide mandrel 17 is 10% to 20% longer than the length of the moving iron core 5. This design reduces the overall weight of the moving iron core and moving parts, facilitating weight reduction, and also ensures that the moving iron core remains aligned during its larger stroke through its guiding function, preventing misalignment. Under vibration conditions, the guide mandrel 17 can guide and limit the movement of the moving iron core 5, effectively suppressing excessive displacement of the moving iron core 5 and preventing structural damage or functional failure caused by it.

[0030] Because gate valves used in nuclear power plants have extremely high safety requirements, and resonance during earthquakes must be avoided, this application addresses this issue by reducing the overall mass of moving parts and increasing structural stiffness to raise the natural frequency of the gate valve. This results in the first-order natural frequency of the gate valve being greater than 33 Hz, effectively avoiding the main frequency range of typical seismic response spectra of nuclear power plants, preventing resonance, improving the seismic resistance of the gate valve, and ensuring its safe and stable operation under seismic conditions.

[0031] The formula for calculating the natural frequency is as follows: Where k represents structural stiffness and m represents the total mass of moving parts. In this application, the valve stem 6, pilot valve core 12, and main valve core 13 are all made of high-strength, high-temperature resistant austenitic stainless steel, and a guide spindle 17 is set inside the moving iron core 5. While reducing the total mass of moving parts, the structural strength is increased, so that the first natural frequency of the entire shut-off valve reaches above 33Hz, successfully avoiding the main frequency range of the typical seismic response spectrum of nuclear power plants (usually between 20-30Hz), effectively preventing resonance and ensuring the safe and stable operation of the valve under seismic conditions.

[0032] The outer peripheral surface of the main valve core 13 forms a first inclined surface 1303 and a second inclined surface 1304. The first inclined surface 1303 is located above the first pressure relief channel 1301, and the second inclined surface 1304 is located below the first pressure relief channel 1301. Preferably, the inclination angles of the first inclined surface 1303 and the second inclined surface 1304 are matched with the inclination angle of the guide surface 903. When the medium flows through the first inclined surface 1303 and the second inclined surface 1304, the first inclined surface 1303 and the second inclined surface 1304 can also play a good guiding role for the fluid, making the flow resistance of the shut-off valve small, significantly reducing the local resistance and energy loss of the fluid, and greatly reducing the overall flow resistance coefficient of the shut-off valve. This avoids the generation of large-scale flow separation and eddies, thereby ensuring the flow stability of the shut-off valve, improving the measurement accuracy of the shut-off valve, and reducing energy consumption. The first inclined surface 1303, the second inclined surface 1304, and the guide surface 903 work together to reduce the flow resistance of the shut-off valve, improve the measurement accuracy, and reduce energy consumption.

[0033] A third inclined surface adapted to the second inclined surface 1304 is formed on the valve body 1. When the shut-off valve is in the closed state, the second inclined surface 1304 and the third inclined surface seal against each other. When the medium switches from the open state to the closed state, the main valve core 13 moves downward and seals against the valve body 1, thereby closing the shut-off valve. In this application, the third inclined surface and the second inclined surface 1304 cooperate with each other to achieve self-centering sealing between the valve body 1 and the main valve core 13, resulting in a good sealing effect.

[0034] The sealing protrusion 1201 is frustoconical, and the second pressure relief channel 1302 includes a tapered channel that matches the sealing protrusion 1201, so that the pilot valve core 12 and the main valve core 13 self-align and seal, thereby improving the sealing effect.

[0035] In addition, a gasket is provided between the pilot valve core 12 and the moving iron core 5, so that the pilot valve core 12 and the moving iron core 5 can achieve a floating connection. During the closing process of the shut-off valve, the floating connection structure provides a certain self-centering margin to ensure that the sealing surface can automatically correct and fit evenly, so as to achieve a stable and reliable sealing effect.

[0036] Preferably, Stellite alloy is overlaid on the third inclined surface of the valve body 1, and the weld layer thickness is 3.5mm. After overlaying, the hardness of the third inclined surface reaches HRC45, while the hardness of the second inclined surface 1304 is HRC40, forming a hardness difference of 5HRC. This hardness difference design can cause the softer second inclined surface 1304 to undergo slight plastic deformation during frequent opening and closing, better embedding into the harder third inclined surface, thereby forming a tighter sealing line, effectively improving the sealing performance of the gate valve and preventing media leakage.

[0037] In another exemplary embodiment, a shape memory alloy ring is provided on the third inclined surface of the valve body 1. Specifically, an annular groove is machined on the third inclined surface of the valve body 1, and a shape memory alloy is embedded in the annular groove to form a shape memory alloy ring. The alloy ring has recoverable deformation characteristics that change with temperature. The composition of the alloy ring is preferably Ni-Ti based. When the temperature rises, the alloy ring undergoes a martensitic-to-austenitic phase transformation, its outer diameter expands, and it expands outward, pushing the sealing surface to fit tightly. When the temperature drops, the alloy ring returns to its original shape, avoiding excessive compression that could lead to plastic deformation. In this way, adaptive adjustment of the sealing pressure can be achieved, significantly improving the sealing reliability of the gate valve under variable temperature conditions.

[0038] In the nuclear power industry, the medium transported by the shut-off valve has a certain temperature, and sometimes the medium is a high-temperature medium. In an exemplary embodiment of this application, as shown... Figure 1As shown, the heat insulation and heat dissipation component adopts a comprehensive structural design of internal heat insulation and external heat dissipation. The heat insulation and heat dissipation component includes a heat dissipation sleeve 15, a heat insulation pad 16 disposed above the heat dissipation sleeve 15, and a heat insulation sleeve 14 disposed inside the heat dissipation sleeve 15. The heat insulation sleeve 14 is made of austenitic stainless steel, and its outer periphery is provided with multiple guide grooves arranged at intervals along the axial direction, which can effectively block the upward conduction of heat by the high-temperature medium. The heat dissipation sleeve 15 is made of high-strength, high-temperature resistant stainless steel, and its outer periphery is provided with multiple fins arranged at intervals along the axial direction. The fins are 2.5mm thick, 8mm high, and the spacing between adjacent fins is 6mm, which effectively increases the contact area with the surrounding air, promotes heat dissipation into the environment, and further prevents the electromagnetic drive components, such as coils, from transferring heat and avoids the temperature rise of the electromagnetic drive components. A heat insulation sleeve 14, a heat dissipation sleeve 15, and a heat insulation pad 16 are installed between the valve body 1 and the electromagnetic drive assembly. This effectively suppresses the transfer of heat from the high-temperature medium inside the shut-off valve to the electromagnetic drive assembly through heat convection, heat conduction, and heat radiation, thereby reducing its operating temperature and ensuring that the electromagnetic drive assembly remains within its allowable temperature range. The heat insulation pad 16 is made of silicone rubber material with excellent high-temperature resistance and radiation resistance, which effectively blocks the transfer of heat from the medium to the electromagnetic drive assembly. This not only significantly blocks the influence of the medium temperature on the electromagnetic drive assembly but also enhances the heat dissipation capacity of the electromagnetic drive assembly itself, further ensuring the normal operating temperature of the electromagnetic drive assembly and improving the overall performance and reliability of the shut-off valve.

[0039] Because the shut-off valves used in nuclear power plants have extremely high safety requirements, and resonance during earthquakes must be avoided, this application further includes a magnetorheological fluid damper on the shut-off valve. The damper is mounted on the moving iron core 5 and positioned above the pilot valve core 12. The damper is filled with magnetorheological fluid and externally connected to a miniature electromagnetic coil. A vibration frequency sensor detects the ambient vibration frequency in real time. When the vibration frequency approaches the shut-off valve's natural frequency, the miniature electromagnetic coil is energized to activate the magnetorheological fluid, dynamically increasing the damping coefficient from 100 N·s / m to 800 N·s / m, thus actively suppressing resonance.

[0040] A valve stem sleeve 24 is fitted around the outer side of the valve stem 6, and a permanent magnet 28 is mounted on its top. A sensor mounting base 23 is fitted around the outer side of the valve stem sleeve 24. Multiple position sensors 25 are arranged circumferentially around the inner side of the sensor mounting base 23. The sensor mounting base 23, valve stem sleeve 24, position sensors 25, and permanent magnet 28 together form a valve position indicator. When the moving iron core 5 moves upward, it drives the valve stem 6 to move upward, which in turn causes the permanent magnet 28 on the top of the valve stem 6 to move upward to the fully open position. The position sensor 25 forms magnetic induction coupling and triggers the output of a fully open state signal. Preferably, in this application, the position sensor is a non-contact sensor, and the permanent magnet 28 linked with the valve stem 6 achieves non-contact position detection to accurately detect the working state of the shut-off valve. The permanent magnet 28 is a high-temperature resistant and radiation-resistant samarium cobalt magnet, which has the ability to work stably under harsh conditions. The position sensor 25 is shielded and encapsulated with radiation-resistant and electromagnetic interference-resistant materials, and accurately senses the position of the valve stem 6 in a non-contact manner.

[0041] Preferably, the position sensor 25 is provided with a third spring 26 at the lower part and an adjusting screw 27 at the upper part. In this way, the position of the position sensor 25 in the axial direction can be adjusted by adjusting the position of the adjusting screw 27, so as to calibrate the valve position feedback accuracy. The adjustable design facilitates on-site calibration and provides important technical support and guarantee for the safety monitoring of nuclear power plant reactor systems. The calibration accuracy can reach ±0.5mm.

[0042] like Figure 5 As shown, in this application, coil 3 adopts an integrated intelligent energy-saving electromagnetic coil, which integrates an intelligent energy-saving drive circuit and is connected to the AC electromagnetic coil. When the shut-off valve is first energized and started, the circuit outputs 80VA of starting power, driving the moving iron core 5 to move upward and engage with the stationary iron core 4; 400ms after energization, the built-in energy-saving module automatically switches the working mode, reducing the coil power to 10VA to reliably maintain the engaged state of the moving iron core 5 and the stationary iron core 4. The core of this circuit is a boost and holding circuit based on transistors, capacitors, and resistors. At the moment of startup, the capacitor is rapidly charged through the switching action of the transistor, generating an instantaneous high voltage applied to the electromagnetic coil, thereby forming a strong initial electromagnetic force. After engagement, the energy-saving module significantly reduces the holding current by adjusting the circuit impedance, reducing the power to 10VA. In this way, the powerful driving force required for startup is guaranteed, while the maintenance power consumption is extremely low. This avoids the temperature rise problem caused by long-term high-power operation of the electromagnetic coil, effectively extends the service life of coil 3, improves the working reliability of the shut-off valve, and ensures the stable operation of the shut-off valve under the harsh conditions of nuclear power plants.

[0043] The coil 3 in this application is an explosion-proof coil. The encapsulated coil 3 is sealed within a closed coil housing 2, capable of withstanding the pressure generated by an explosion and preventing the explosion from propagating. A miniature fiber Bragg grating sensor is installed inside the insulation layer of the coil 3. The sensor transmits real-time data to the nuclear power plant's central control system via a radiation-resistant, low-power radio frequency module. When the data exceeds the radiation aging threshold, the system automatically triggers a graded early warning, enabling early detection of the radiation aging trend of key components of the coil 3, achieving preventative maintenance, and avoiding the risks to the nuclear power system caused by sudden failure of the shut-off valve.

[0044] In this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the article or device that includes said element.

[0045] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0046] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if these modifications and variations fall within the scope of the claims of this application and their equivalents, the intent of this application also includes these modifications and variations.

Claims

1. A shock-resistant and impact-resistant pilot-operated electromagnetic shut-off valve, characterized in that, It includes a valve body (1), a coil housing (2), a coil (3), a stationary iron core (4), a moving iron core (5), a valve stem (6), a first spring (7), a second spring (8), a guide sleeve (9), a pressure ring (10), a guide ring (11), a pilot valve core (12), a main valve core (13), and a heat insulation and heat dissipation assembly; The valve body (1) is provided with a medium inflow channel (101) and an outflow channel (102) that are interconnected; one end of the heat insulation and heat dissipation assembly is located inside the valve body (1), and the other end is located inside the coil housing (2); the coil (3) is located inside the coil housing (2); the stationary iron core (4) is sleeved inside the coil (3); the valve stem (6) is movably inserted through the stationary iron core (4), and a moving iron core (5) is provided at its lower end; the first spring (7) is sleeved inside the coil housing (2). On the valve stem (6), and the lower end abuts against the top of the moving iron core (5); the pressure ring (10) is disposed inside the heat insulation and heat dissipation assembly; the guide sleeve (9) includes a sleeve body (901) and a limiting part (902) disposed on the outer circumferential surface of the sleeve body (901); the upper end of the sleeve body (901) is sleeved inside the heat insulation and heat dissipation assembly, and the upper end surface of the limiting part (902) abuts against the lower end surface of the heat insulation and heat dissipation assembly; the lower end ... of the heat insulation and heat dissipation assembly; the lower end of the limiting part (902) abuts against the lower end of the heat insulation and heat dissipation assembly; the lower end of the limiting part (902) abuts against the lower end of the heat insulation and heat dissipation assembly; the lower end of the limiting part (902) An inclined guide surface (903) is formed on the outer peripheral surface of the sleeve body (901); from the limiting part (902) to the lower end face of the sleeve body (901), the guide surface (903) gradually approaches the main valve core (13); the guide ring (11) and the main valve core (13) are arranged sequentially from top to bottom inside the guide sleeve (9); the second spring (8) is disposed between the pressure ring (10) and the guide ring (11); the moving iron core (5) passes through the heat insulation The heat dissipation assembly, the pressure ring (10), and the guide ring (11) are provided with a pilot valve core (12) at the lower end; the main valve core (13) is provided with a first pressure relief channel (1301) and a second pressure relief channel (1302); the end of the pilot valve core (12) forms a sealing protrusion (1201), and when the shut-off valve is in the normally closed state, the sealing protrusion (1201) can be inserted into the second pressure relief channel (1302) to seal the second pressure relief channel (1302).

2. The shock-resistant and impact-resistant pilot-operated electromagnetic shut-off valve according to claim 1, characterized in that, The guide surface (903) of the guide sleeve (9) has an angle of 15° to 30° with the axial direction.

3. The shock-resistant and impact-resistant pilot-operated electromagnetic shut-off valve according to claim 1, characterized in that, The outer peripheral surface of the main valve core (13) forms a first inclined surface (1303) and a second inclined surface (1304); the first inclined surface (1303) is located above the first pressure relief channel (1301); the second inclined surface (1304) is located below the first pressure relief channel (1301); a third inclined surface adapted to the second inclined surface (1304) is formed on the valve body (1).

4. The shock-resistant and impact-resistant pilot-operated electromagnetic shut-off valve according to claim 1, characterized in that, The sealing protrusion (1201) is frustoconical, and the second pressure relief channel (1302) includes a tapered channel adapted to the sealing protrusion (1201).

5. The shock-resistant and impact-resistant pilot-operated electromagnetic shut-off valve according to claim 1, characterized in that, The heat insulation and heat dissipation assembly includes a heat dissipation sleeve (15) and a heat insulation sleeve (14) sleeved inside the heat dissipation sleeve (15); the outer periphery of the heat insulation sleeve (14) is provided with a plurality of flow guide grooves arranged at intervals along the axial direction; the outer periphery of the heat dissipation sleeve (15) is provided with a plurality of fins arranged at intervals along the axial direction.

6. The shock-resistant and impact-resistant pilot-operated electromagnetic shut-off valve according to any one of claims 1 to 5, characterized in that, It also includes a magnetorheological fluid damper, which is disposed on the moving iron core (5) and located above the pilot valve core (12).

7. The shock-resistant and impact-resistant pilot-operated electromagnetic shut-off valve according to claim 1, characterized in that, A guide spindle (17) is provided inside the moving iron core (5) along the direction of movement of the moving iron core (5). The top end of the guide spindle (17) extends out of the moving iron core (5) and abuts against the lower end of the stationary iron core (4).

8. The shock-resistant and impact-resistant pilot-operated electromagnetic shut-off valve according to claim 3, characterized in that, Stellite alloy is overlaid on the third inclined surface of the valve body (1), and the weld layer thickness is 3.5mm.

9. The shock-resistant and impact-resistant pilot-operated electromagnetic shut-off valve according to claim 1, characterized in that, The valve stem (6) is fitted with a valve stem sleeve (24) on the outside and a permanent magnet (28) is provided on the top; a sensor mounting base (23) is fitted on the outside of the valve stem sleeve (24); a plurality of position sensors (25) are arranged circumferentially around the sensor mounting base (23).

10. The shock-resistant and impact-resistant pilot-operated electromagnetic shut-off valve according to claim 9, characterized in that, The position sensor (25) has a third spring (26) at the bottom and an adjusting screw (27) at the top.

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