High-temperature-resistant corrugated pipe stop valve capable of improving sealing performance and using method of high-temperature-resistant corrugated pipe stop valve

Abstract

The invention discloses a high-temperature-resistant corrugated pipe stop valve capable of improving sealing performance and a using method of the high-temperature-resistant corrugated pipe stop valve, and relates to the technical field of stop valves. The high-temperature-resistant corrugated pipe stop valve comprises a stop valve body, the top of the stop valve body is sequentially connected with a gasket, a sealing cover and a packing gland, and a valve rod is connected into the packing gland, the sealing cover and the stop valve body in a penetrating mode; a magnetic suspension guide valve rod supporting module is connected in the valve rod and comprises a high-temperature-resistant permanent magnet embedded in the position, close to the sealing cover, of the valve rod, and a high-temperature-resistant electromagnetic coil is wound in the sealing cover. The magnetic suspension guide valve rod supporting module is arranged in the valve rod, so that the problems that according to a traditional valve rod supporting mode, under the high-temperature or high-pressure severe working condition, friction and abrasion are generated due to direct contact between the valve rod and surrounding parts, the movement precision of the valve rod is lowered, and the sealing performance is lowered can be solved. And the service life of the valve is shortened due to the influence of electromagnetic interference and heat accumulation on the reliability of the supporting system.

Description

Technical Field

[0001] The invention relates to the technical field of stop valves, and in particular to a high-temperature resistant bellows stop valve with improved sealing performance and a use method thereof. Background Art

[0002] Traditional bellows stop valves cannot avoid direct contact between the valve stem and surrounding components under harsh working conditions of high temperature or high pressure, resulting in a significant reduction in the movement accuracy of the valve stem due to friction and wear during movement. At the same time, the sealing performance also decreases with the use time. The bellows stop valve of the present application can solve the problem that traditional valve stem support methods, under harsh working conditions of high temperature or high pressure, cause friction and wear between the valve stem and surrounding components, resulting in reduced valve stem movement accuracy and reduced sealing performance, as well as electromagnetic interference and heat accumulation affecting the reliability of the support system, thereby shortening the service life of the valve.

[0003] The defects of the existing bellows stop valve are: 1. Patent document CN103925381B discloses a bellows stop valve. The document mainly considers that when the valve disc is rising or closing, the valve disc has no guide in the whole stroke. Often under the scouring of the medium, the valve disc rotates and vibrates freely 360 degrees, which can easily lead to valve seal failure, or even cause the valve disc to loosen, which can easily cause toxic substances or precious metals to leak or escape into the environment, and even cause significant economic losses due to long-term shutdown of the factory. It does not consider how to solve the problem of traditional valve stem support method under high temperature or high pressure harsh working conditions, friction and wear caused by direct contact between the valve stem and surrounding components, resulting in reduced valve stem movement accuracy and reduced sealing, and electromagnetic interference and heat accumulation affecting the reliability of the support system, thereby shortening the service life of the valve; 2. Patent document CN102966789B discloses a multi-seal bellows stop valve. The document mainly considers how to improve the sealing performance and service life of the bellows stop valve and ensure the stable operation of the entire pipeline system and equipment. It does not consider how to solve the problem that the ordinary liquid inlet structure cannot effectively disperse the medium, reduce the flow rate and impact force when the medium flows at high speed, so that the medium directly washes the key components inside the valve body, causing wear or corrosion of the components, shortening the service life of the valve, and increasing maintenance costs; 3. Patent document CN101982681B discloses a bellows stop valve. The document mainly considers how to improve the service life of the bellows stop valve and its safety level, but does not consider how to solve the problem that the existing single material or fixed sealing structure cannot be adaptively adjusted according to the change of medium pressure, and the sealing is not tight when the medium pressure fluctuates, resulting in medium leakage, affecting the normal operation of the valve and the safety of the system; 4. Patent document CN101701632B discloses a bellows globe valve. This document mainly considers that existing bellows valves are designed with two seals, one bellows seal and one packing seal. However, the packing seal cannot achieve complete leak - free. Once the bellows fails during use, flammable, explosive, toxic, harmful and other fluid media may still leak out. It does not consider how to solve the problem that when there is a pressure difference on both sides of the valve disc in a valve lacking a pressure balance structure, the valve disc bears additional stress and deformation, resulting in difficult opening and closing of the valve and increased operating force, and even damage to the valve disc and other related components, affecting the working stability and service life of the valve. Summary of the Invention

[0004] The purpose of the present invention is to provide a high - temperature resistant bellows globe valve with improved sealing performance and its usage method to solve the problems raised in the above - mentioned background technology.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A high - temperature resistant bellows globe valve with improved sealing performance, including a globe valve body. A gasket is connected to the top of the globe valve body, a sealing cover is connected to the top of the gasket, a packing gland is connected to the top of the sealing cover. A valve stem penetrates through the packing gland, the sealing cover and the globe valve body. A magnetic levitation guiding valve stem support module is connected inside the valve stem, and the magnetic levitation guiding valve stem support module is used to provide a levitation support force for the valve stem. The magnetic levitation guiding valve stem support module includes high - temperature resistant permanent magnets embedded near the sealing cover of the valve stem. The high - temperature resistant permanent magnets are evenly distributed in a circle near the sealing cover of the valve stem, and the number is 6 - 8. A fixed bracket is embedded on the inner surface of the sealing cover. The inner part of the sealing cover is wound with high - temperature resistant electromagnetic coils in layers, and the fixed bracket is located on one side of the high - temperature resistant electromagnetic coils. The high - temperature resistant electromagnetic coils are wound in a layered spiral manner, with 20 - 30 turns per layer and 3 - 5 layers. Insulating heat - conducting layers are provided on the contact surfaces between the high - temperature resistant permanent magnets and the valve stem and between the high - temperature resistant electromagnetic coils and the sealing cover.

[0006] Preferably, a displacement sensor, a speed sensor and a temperature sensor are arranged inside the valve stem. A microprocessor and a sensor signal acquisition component are arranged inside the sealing cover. The microprocessor and the sensor signal acquisition component are connected to the electromagnetic coils through a cable, and are used to receive the signals of the displacement sensor, the speed sensor and the temperature sensor in real time, and adjust the magnitude and direction of the current of the electromagnetic coils according to the control algorithm to achieve the control of the levitation force and guiding of the valve stem.

[0007] Preferably, a liquid inlet is provided on one side of the stop valve body, and an anti-scour diversion buffer inner core is connected to the inside of the liquid inlet. The anti-scour diversion buffer inner core is in a truncated cone shape, and evenly arranged inclined diversion holes are provided inside the anti-scour diversion buffer inner core. A liquid outlet is provided on the other side of the stop valve body; A hand wheel is connected to the top of the valve stem; The bottom of the valve stem is connected to a valve seat.

[0008] Preferably, the interior of the packing gland near the valve stem is filled with sealing packing; The outer surface of the valve stem is connected with a sealing bellows, and the sealing bellows is located on the inner side of the sealing cover.

[0009] Preferably, a cleaning scraper is connected to the inside of the stop valve body, and the cleaning scraper is located below the sealing bellows. The cleaning scraper is in a circular ring shape and is fixed to the inside of the stop valve body by bolts. The inner diameter of the cleaning scraper is matched with the outer diameter of the valve stem, and the inner surface of the cleaning scraper is provided with a micro-tooth structure.

[0010] Preferably, the shut-off valve body is internally connected with a valve disc, and the valve disc is internally connected with an adaptive elastic sealing module, and the adaptive elastic sealing module is used to achieve dynamic sealing according to the pressure change of the medium inside the shut-off valve body; The adaptive elastic sealing module includes an elastic rubber matrix connected to the inside of the valve disc, and a shape memory alloy wire braided mesh is embedded in the elastic rubber matrix; Pressure sensing microcapsules are evenly dispersed inside the elastic rubber matrix. The pressure sensing microcapsules are made of polyurethane polymer material. Silicone oil is encapsulated inside the pressure sensing microcapsules as pressure sensitive liquid.

[0011] Preferably, the elastic rubber matrix is ​​a blend of nitrile rubber and fluororubber, wherein the mass ratio of nitrile rubber to fluororubber is 3:2; The shape memory alloy wire mesh adopts plain weave and the wire diameter is 0.2-0.3mm.

[0012] Preferably, a pressure balance compensation module is provided inside the valve disc, and the pressure balance compensation module is used to balance the pressure difference on both sides of the valve disc; The pressure balance compensation module includes a pressure balance hole opened inside the valve disc, the inside of the pressure balance hole is connected to a balance piston, the bottom of the balance piston is connected to an elastic compensation spring, and the bottom end of the elastic compensation spring is fixed on the valve disc.

[0013] Preferably, a method for using a high temperature resistant bellows stop valve with improved sealing performance comprises: S1. Turn the handwheel clockwise to move the valve stem upward and open the valve; S2, the medium flows in from the liquid inlet and is diverted and buffered through the inclined diverter holes of the anti-scour diverter buffer inner core; S3. Turn the handwheel counterclockwise to move the valve stem downward to close and open the valve.

[0014] Preferably, in S3, it further includes: S31, the displacement sensor, speed sensor and temperature sensor monitor the position, moving speed and temperature of the valve stem in real time, and transmit the collected data to the microprocessor and sensor signal acquisition component inside the sealing cover; S32, the microprocessor analyzes and processes the data and adjusts the current size and direction of the high temperature resistant electromagnetic coil through the cable according to the analysis result; S33. There are 6 to 8 high temperature resistant permanent magnets evenly distributed around the valve stem near the sealing cover. When the high temperature resistant electromagnetic coil generates a magnetic field, the magnetic field interacts with the magnetic field of the high temperature resistant permanent magnet. When the magnetic field force between the two reaches a balance, it provides suspension support force for the valve stem.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention provides a magnetic suspension guide valve stem support module inside the valve stem, including 6-8 high-temperature resistant permanent magnets evenly distributed on the circumference of the valve stem near the sealing cover and a high-temperature resistant electromagnetic coil that is spirally wound in layers inside the sealing cover, with 20-30 turns in each layer and a total of 3-5 layers, and an insulating heat-conducting layer is provided on the contact surface between the permanent magnet and the valve stem, and the electromagnetic coil and the sealing cover, so as to achieve the effect of providing a suspension support force for the valve stem. Compared with the traditional valve stem support method in the prior art, on the one hand, the magnetic suspension support avoids direct contact between the valve stem and surrounding components, greatly improves the stability and smoothness of the valve stem movement, and enables the valve stem to move accurately under harsh working conditions such as high temperature and high pressure. On the other hand, the insulating heat-conducting layer effectively prevents electromagnetic interference and heat accumulation, and ensures the reliability of the magnetic suspension system. Therefore, the problem that the traditional valve stem support method under harsh working conditions such as high temperature or high pressure causes friction and wear due to direct contact between the valve stem and surrounding components, resulting in reduced valve stem movement accuracy and reduced sealing, and electromagnetic interference and heat accumulation affect the reliability of the support system, thereby shortening the service life of the valve can be solved.

[0016] 2. The present invention provides an anti-scouring diverter buffer inner core at the liquid inlet of the stop valve body. The inner core is in a frustum shape and has evenly arranged inclined diverter holes inside, so as to achieve the effect of diverting and buffering the incoming medium. Compared with the ordinary liquid inlet structure in the prior art, the frustum design and the inclined diverter holes can make the medium more evenly dispersed when entering the valve body, effectively reducing the flow rate and impact force of the medium. When the high-speed medium flows, this structure can reduce the direct scouring of the medium on key components inside the valve body such as the valve disc or the valve seat, and improve the anti-scouring ability of the internal components of the valve body. Therefore, it can solve the problem that the ordinary liquid inlet structure cannot effectively disperse the medium, reduce the flow rate and impact force when the high-speed medium flows, so that the medium directly scours the key components inside the valve body, causing wear or corrosion of the components, shortening the service life of the valve, and increasing maintenance costs.

[0017] 3. The present invention sets an adaptive elastic sealing module inside the valve disc, including an elastic rubber matrix made of a blend of nitrile rubber and fluororubber in a mass ratio of 3:2, a shape memory alloy wire mesh with a wire diameter of 0.2-0.3mm in a plain weave manner, and a polyurethane polymer pressure sensing microcapsule with silicone oil encapsulated inside, so as to achieve a dynamic sealing effect according to the pressure change of the medium inside the valve body of the stop valve. Compared with the single material or fixed sealing structure in the prior art, the elastic rubber matrix provides basic sealing elasticity, the shape memory alloy wire mesh enhances the strength and recovery ability of the sealing structure, and the pressure sensing microcapsule can adjust its own state according to the change of medium pressure. When the medium pressure increases, the silicone oil in the pressure sensing microcapsule expands under pressure, pushes the elastic rubber matrix to deform, and enhances the sealing effect. When the pressure decreases, it returns to its original state. Therefore, it can solve the problem that the existing single material or fixed sealing structure cannot be adaptively adjusted according to the change of medium pressure, and the sealing is not tight when the medium pressure fluctuates, resulting in medium leakage, affecting the normal operation of the valve and the safety of the system.

[0018] 4. The present invention achieves the effect of balancing the pressure difference on both sides of the valve flap by arranging a pressure balancing compensation module inside the valve flap, including a pressure balancing hole, a balancing piston and an elastic compensation spring. Compared with the valve that lacks a pressure balancing structure in the prior art, when a pressure difference appears on both sides of the valve flap, the balancing piston in the pressure balancing hole will move under the action of pressure, compressing or stretching the elastic compensation spring, and balancing the pressure difference through the elastic force of the elastic compensation spring, so that the pressure on both sides of the valve flap tends to be consistent. This structure can effectively reduce the additional stress and deformation on the valve flap caused by excessive pressure difference, and improve the working stability of the valve. Therefore, it can solve the problem that when a pressure difference appears on both sides of the valve flap of a valve that lacks a pressure balancing structure, the valve flap is subjected to additional stress and deformation, resulting in difficulty in opening and closing the valve and increased operating force, and even damage to the valve flap and other related components, affecting the working stability and service life of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a front structural schematic diagram of the present invention; Figure 3 It is a schematic diagram of the cross-sectional structure of the present invention; Figure 4 It is a schematic structural diagram of the magnetic suspension guide valve stem support module of the present invention; Figure 5 It is a schematic diagram of the structure of the adaptive elastic sealing module of the present invention; Figure 6 It is a schematic diagram of the structure of the pressure balance compensation module of the present invention; Figure 7 It is the work flow chart of the present invention.

[0020] In the figure: 1. stop valve body; 2. gasket; 3. sealing cover; 4. packing gland; 5. valve stem; 6. high temperature resistant permanent magnet; 7. fixing bracket; 8. high temperature resistant electromagnetic coil; 9. sealing packing; 10. sealing bellows; 11. cleaning scraper; 12. valve disc; 13. elastic rubber matrix; 14. shape memory alloy wire braided mesh; 15. pressure balance hole; 16. balance piston; 17. elastic compensation spring; 18. liquid inlet; 19. anti-scouring diversion buffer inner core; 20. liquid outlet; 21. hand wheel; 22. valve seat. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 7 , an embodiment provided by the present invention: a high temperature resistant bellows stop valve with improved sealing performance, comprising a stop valve body 1, a gasket 2 is connected to the top of the stop valve body 1, a sealing cover 3 is connected to the top of the gasket 2, a packing gland 4 is connected to the top of the sealing cover 3, a valve stem 5 is connected through the packing gland 4, the sealing cover 3 and the stop valve body 1, a magnetic suspension guide valve stem support module is connected to the inside of the valve stem 5, and the magnetic suspension guide valve stem support module is used to provide suspension support force for the valve stem 5; The magnetic suspension guide valve stem support module includes a high temperature resistant permanent magnet 6 embedded in the valve stem 5 near the sealing cover 3. The high temperature resistant permanent magnet 6 is evenly distributed in a circumference at the valve stem 5 near the sealing cover 3, and the number is 6-8; A fixing bracket 7 is embedded in the inner surface of the sealing cover 3, and a high temperature resistant electromagnetic coil 8 is wound in layers inside the sealing cover 3, and the fixing bracket 7 is located on one side of the high temperature resistant electromagnetic coil 8. The high temperature resistant electromagnetic coil 8 is wound in layers, with each layer having 20-30 turns and 3-5 layers. The contact surface between the high temperature resistant permanent magnet 6 and the valve stem 5 and the contact surface between the high temperature resistant electromagnetic coil 8 and the sealing cover 3 are provided with an insulating heat conductive layer.

[0025] The valve stem 5 is provided with a displacement sensor, a speed sensor and a temperature sensor inside; A microprocessor and a sensor signal acquisition component are provided inside the sealing cover 3. The microprocessor and the sensor signal acquisition component are connected to the electromagnetic coil through a cable and are used to receive signals from the displacement sensor, speed sensor and temperature sensor in real time. According to the control algorithm, the current size and direction of the electromagnetic coil are adjusted to achieve control of the suspension force and guidance of the valve stem 5.

[0026] Furthermore, the magnetic levitation guide valve stem support module includes 6-8 high temperature resistant permanent magnets 6 embedded in the valve stem 5 near the sealing cover 3, which are evenly distributed in a circle. A fixed bracket 7 is embedded in the inner surface of the sealing cover 3. A high temperature resistant electromagnetic coil 8 is layered and wound inside the sealing cover 3. The fixed bracket 7 is located on one side of the high temperature resistant electromagnetic coil 8. The high temperature resistant electromagnetic coil 8 adopts a layered spiral winding method, with each layer having 20-30 turns and 3-5 layers. At the same time, the contact surface between the high temperature resistant permanent magnet 6 and the valve stem 5 and the contact surface between the high temperature resistant electromagnetic coil 8 and the sealing cover 3 are provided with an insulating heat conductive layer.

[0027] A magnetic field is generated by energizing the high-temperature resistant electromagnetic coil 8, which interacts with the magnetic field of the high-temperature resistant permanent magnet 6 to provide a suspension support force for the valve stem 5, thereby avoiding direct contact between the valve stem 5 and surrounding components, and improving the stability and smoothness of the movement of the valve stem 5. The insulating and heat-conductive layer can prevent electromagnetic interference and heat accumulation, thereby ensuring the reliability of the magnetic suspension system.

[0028] The displacement sensor, speed sensor and temperature sensor installed inside the valve stem 5 monitor the position, moving speed and temperature of the valve stem 5 in real time, and transmit the signal to the microprocessor and sensor signal acquisition component inside the sealing cover 3. The microprocessor adjusts the current size and direction of the electromagnetic coil through the cable according to the control algorithm to achieve precise control of the suspension force and guidance of the valve stem 5.

[0029] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 , an embodiment of the present invention: a high temperature resistant bellows stop valve with improved sealing performance, wherein a liquid inlet 18 is provided on one side of the stop valve body 1, and an anti-scouring shunt buffer inner core 19 is connected to the inside of the liquid inlet 18, and the anti-scouring shunt buffer inner core 19 is in a truncated cone shape, and the inside of the anti-scouring shunt buffer inner core 19 is provided with evenly arranged inclined shunt holes; A liquid outlet 20 is provided on the other side of the stop valve body 1; The top of the valve stem 5 is connected with a hand wheel 21; The bottom of the valve stem 5 is connected to a valve seat 22 .

[0030] Furthermore, a liquid inlet 18 is opened on one side of the stop valve body 1, and a truncated cone-shaped anti-scour diverter buffer inner core 19 is connected to the inside of the liquid inlet 18, and evenly arranged inclined diverter holes are arranged inside. The truncated cone-shaped design allows the medium to gradually diffuse when entering, and the inclined diverter holes further change the flow direction and speed of the medium.

[0031] The other side of the stop valve body 1 is provided with a liquid outlet 20 for the medium to flow out.

[0032] The top of the valve stem 5 is connected to a hand wheel 21 , and the bottom is connected to a valve seat 22 . The hand wheel 21 is used to manually operate the valve to open and close, and the valve seat 22 cooperates with the valve flap 12 to achieve sealing.

[0033] The medium flows in from the liquid inlet 18 and passes through the inclined diversion hole of the anti-scour diversion buffer inner core 19 to achieve the effect of diversion and buffering. Diversion can make the medium evenly distributed in the valve body, and buffering reduces the flow rate and impact force of the medium, reduces the scouring of key components inside the valve body such as the valve disc 12, valve seat 22, etc., and extends the service life of the components.

[0034] By turning the hand wheel 21, the valve stem 5 is driven to move up and down, thereby controlling the opening and closing of the valve, thereby achieving control over the flow of the medium.

[0035] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 , an embodiment provided by the present invention: a high temperature resistant bellows stop valve with improved sealing performance, wherein the interior of the packing gland 4 near the valve stem 5 is filled with a sealing packing 9; The outer surface of the valve stem 5 is connected with a sealing bellows 10 , and the sealing bellows 10 is located inside the sealing cover 3 .

[0036] A cleaning scraper 11 is connected to the interior of the stop valve body 1 and is located below the sealing bellows 10. The cleaning scraper 11 is in a circular ring shape and is fixed to the interior of the stop valve body 1 by bolts. The inner diameter of the cleaning scraper 11 matches the outer diameter of the valve stem 5, and a micro-tooth structure is provided on the inner surface of the cleaning scraper 11.

[0037] Furthermore, a sealing packing 9 is filled inside the packing gland 4 near the valve stem 5 , and the sealing packing 9 can fill the gap between the valve stem 5 and the packing gland 4 , thereby playing a preliminary sealing role.

[0038] The outer surface of the valve stem 5 is connected with a sealing bellows 10 located inside the sealing cover 3 . The sealing bellows 10 has good flexibility and sealing performance, and can further prevent the medium from leaking along the valve stem 5 .

[0039] A circular cleaning scraper 11 is connected to the inside of the stop valve body 1 below the sealing bellows 10 and is fixed to the inside of the stop valve body 1 by bolts. The inner diameter of the cleaning scraper 11 matches the outer diameter of the valve stem 5 and a micro-tooth structure is provided on the inner surface.

[0040] The sealing packing 9 and the sealing bellows 10 work together to form a double seal, which effectively prevents leakage of the medium and improves the sealing performance of the valve.

[0041] When the valve stem 5 moves up and down, the micro-tooth structure of the cleaning scraper 11 can scrape off impurities attached to the surface of the valve stem 5, keep the surface of the valve stem 5 clean, prevent impurities from entering the sealing part and affecting the sealing effect, and also reduce the wear of the valve stem 5, thereby improving the reliability and service life of the valve.

[0042] See also Figure 3 , Figure 4 , Figure 5 and Figure 6 , an embodiment provided by the present invention: a high temperature resistant bellows stop valve with improved sealing performance, wherein the stop valve body 1 is internally connected with a valve flap 12, and the valve flap 12 is internally connected with an adaptive elastic sealing module, and the adaptive elastic sealing module is used to realize dynamic sealing according to the pressure change of the medium inside the stop valve body 1; The adaptive elastic sealing module includes an elastic rubber matrix 13 connected to the inside of the valve flap 12, and a shape memory alloy wire braided mesh 14 is embedded in the elastic rubber matrix 13; Pressure-sensing microcapsules are uniformly dispersed inside the elastic rubber matrix 13 . The pressure-sensing microcapsules are made of polyurethane polymer material. Silicone oil is encapsulated inside the pressure-sensing microcapsules as a pressure-sensitive liquid.

[0043] The elastic rubber matrix 13 is a blend of nitrile rubber and fluororubber, wherein the mass ratio of nitrile rubber to fluororubber is 3:2; The shape memory alloy wire braided mesh 14 is plain woven, and the wire diameter is 0.2-0.3 mm.

[0044] Furthermore, the valve disc 12 inside the stop valve body 1 is connected to an adaptive elastic sealing module, which includes an elastic rubber matrix 13. The elastic rubber matrix 13 is made of a blend of nitrile rubber and fluororubber in a mass ratio of 3:2. Nitrile rubber has good oil resistance and wear resistance, and fluororubber has excellent high temperature resistance and corrosion resistance. The blend of the two can combine the advantages of both and improve the performance of the sealing module.

[0045] A shape memory alloy wire mesh 14 with a plain weave and a wire diameter of 0.2-0.3 mm is embedded in the elastic rubber matrix 13. The plain weave makes the mesh structure more stable, and the shape memory alloy wire has the characteristic of restoring its original shape under specific temperature or stress conditions.

[0046] Pressure sensing microcapsules made of polyurethane polymer material and encapsulating silicone oil as a pressure sensitive liquid are uniformly dispersed inside the elastic rubber matrix 13. The polyurethane polymer material has good elasticity and sealing properties, and the volume of the silicone oil will change with the pressure.

[0047] When the medium pressure inside the stop valve body 1 increases, the silicone oil in the pressure sensing microcapsule expands under pressure, pushing the elastic rubber matrix 13 to deform, making the seal between the valve disc 12 and the valve seat 22 tighter and enhancing the sealing effect.

[0048] When the medium pressure decreases, the silicone oil shrinks, and the elastic rubber matrix 13 returns to its original state under the action of the shape memory alloy wire mesh 14, and continues to maintain good sealing performance. This dynamic sealing method can adjust the sealing state in real time according to the change of medium pressure, ensuring that the valve can achieve reliable sealing under different working conditions.

[0049] See also Figure 3 , Figure 4 , Figure 5 and Figure 6 , an embodiment provided by the present invention: a high temperature resistant bellows stop valve with improved sealing performance, wherein a pressure balance compensation module is provided inside the valve disc 12, and the pressure balance compensation module is used to balance the pressure difference on both sides of the valve disc 12; The pressure balance compensation module includes a pressure balance hole 15 opened inside the valve disc 12 , the inside of the pressure balance hole 15 is connected to a balance piston 16 , the bottom of the balance piston 16 is connected to an elastic compensation spring 17 , and the bottom end of the elastic compensation spring 17 is fixed on the valve disc 12 .

[0050] Furthermore, a pressure balancing compensation module is provided inside the valve disc 12 , including a pressure balancing hole 15 opened inside the valve disc 12 , a balancing piston 16 is connected inside the pressure balancing hole 15 , and an elastic compensation spring 17 whose bottom end is fixed on the valve disc 12 is connected to the bottom of the balancing piston 16 .

[0051] When a pressure difference occurs on both sides of the valve disc 12 , the medium on the side with higher pressure pushes the balance piston 16 to move through the pressure balance hole 15 , thereby compressing or stretching the elastic compensation spring 17 .

[0052] The elastic force of the elastic compensation spring 17 will produce a reaction force on the balance piston 16, thereby balancing the pressure difference on both sides of the valve disc 12 and making the pressure on both sides of the valve disc 12 tend to be consistent. This can reduce the additional stress and deformation of the valve disc 12 caused by excessive pressure difference, reduce the difficulty of opening and closing the valve, and improve the working stability and service life of the valve.

[0053] Further, a method for using a high temperature resistant bellows stop valve with improved sealing performance, the method for using the stop valve comprises: S1. Turn the hand wheel 21 clockwise to move the valve stem 5 upward to open the valve; S2, the medium flows in from the liquid inlet 18, and is diverted and buffered through the inclined diverter holes of the anti-scour diverter buffer inner core 19; S3. Turn the hand wheel 21 counterclockwise to move the valve stem 5 downward to close the open valve.

[0054] Furthermore, S3 also includes: S31, the displacement sensor, speed sensor and temperature sensor monitor the position, moving speed and temperature of the valve stem 5 in real time, and transmit the collected data to the microprocessor and sensor signal acquisition component inside the sealing cover 3; S32, the microprocessor analyzes and processes the data and adjusts the current size and direction of the high temperature resistant electromagnetic coil 8 through the cable according to the analysis result; S33, 6-8 high temperature resistant permanent magnets 6 are evenly distributed on the circumference of the valve stem 5 near the sealing cover 3. When the high temperature resistant electromagnetic coil 8 generates a magnetic field, the magnetic field interacts with the magnetic field of the high temperature resistant permanent magnet 6. After the magnetic field force between the two reaches a balance, a suspension support force is provided for the valve stem 5.

[0055] Working principle: The high temperature resistant bellows stop valve with improved sealing performance can be used for a long time under the working conditions of -29℃~425℃, and the applicable media include oil, water and steam.

[0056] Start the high temperature resistant electromagnetic coil 8 in the sealing cover 3 and pass current through it. Since the layered spiral winding method is adopted, the number of turns per layer is 20-30 turns, and the number of layers is 3-5. The current flows in the high temperature resistant electromagnetic coil 8 to generate a magnetic field. The fixed bracket 7 on the inner surface of the sealing cover 3 plays a role in fixing the position of the high temperature resistant electromagnetic coil 8 to ensure the stable generation of the magnetic field.

[0057] The valve stem 5 is evenly inlaid with 6-8 high temperature resistant permanent magnets 6 on the circumference near the sealing cover 3, and has its own magnetic field. The magnetic field generated by the high temperature resistant electromagnetic coil 8 interacts with the magnetic field of the high temperature resistant permanent magnet 6. When the magnetic field force between the two reaches a balance, it provides a suspension support force for the valve stem 5, so that the valve stem 5 is in a suspended state and avoids direct contact with surrounding components.

[0058] The displacement sensor, speed sensor and temperature sensor inside the valve stem 5 work in real time. The displacement sensor monitors the position of the valve stem 5, the speed sensor monitors its moving speed, and the temperature sensor monitors the temperature of the valve stem 5. These sensors transmit the collected data to the sensor signal acquisition component inside the sealing cover 3, and the sensor signal acquisition component then transmits the signal to the microprocessor. The microprocessor analyzes and processes the data according to a preset control algorithm, and then adjusts the current size and direction of the high-temperature resistant electromagnetic coil 8 through a cable, thereby adjusting the magnetic field force in real time and accurately controlling the suspension force and guidance of the valve stem 5.

[0059] The operator rotates the hand wheel 21 clockwise, and the rotation of the hand wheel 21 drives the valve stem 5 connected thereto to move upward, and the valve seat 22 at the bottom of the valve stem 5 moves upward accordingly, so that the valve is opened.

[0060] After the valve is opened, the medium flows in from the liquid inlet 18 on one side of the stop valve body 1. Inside the liquid inlet 18, there is an anti-scouring shunt buffer inner core 19 in the shape of a truncated cone with evenly arranged inclined shunt holes. After the medium enters, the truncated cone-shaped structure causes the medium to gradually spread, and the inclined shunt holes change the flow direction and speed of the medium, realizing the shunting and buffering of the medium, and reducing the flow rate and impact force of the medium.

[0061] The treated medium flows inside the valve body and finally flows out from the liquid outlet 20 on the other side of the stop valve body 1.

[0062] The operator rotates the handwheel 21 counterclockwise, driving the valve stem 5 to move downward. The valve seat 22 at the bottom of the valve stem 5 moves downward accordingly until it fits tightly with the valve flap 12 to close the valve.

[0063] The sealing packing 9 filled inside the packing gland 4 near the valve stem 5 fills the gap between the valve stem 5 and the packing gland 4, and plays a role in initially preventing the medium from leaking along the valve stem 5 during the up and down movement of the valve stem 5.

[0064] The sealing bellows 10 connected to the outer surface of the valve stem 5 and located inside the sealing cover 3 has good flexibility. When the valve stem 5 moves, the sealing bellows 10 expands and contracts accordingly, further preventing the medium from leaking from the gap between the valve stem 5 and the sealing cover 3, and forming a double seal with the sealing packing 9.

[0065] When the valve stem 5 moves up and down, the cleaning scraper 11 inside the stop valve body 1 and below the sealing bellows 10 comes into play. The cleaning scraper 11 is in the shape of a circular ring, the inner diameter of which is adapted to the outer diameter of the valve stem 5, and the inner surface is provided with a micro-tooth structure. During the movement of the valve stem 5, the micro-tooth structure scrapes off the impurities attached to the surface of the valve stem 5, keeping the surface of the valve stem 5 clean and avoiding the influence of impurities on the sealing effect.

[0066] When the medium pressure inside the stop valve body 1 changes, the pressure-sensitive microcapsules evenly dispersed in the elastic rubber matrix 13 inside the valve flap 12 start to work. The pressure-sensitive microcapsules are made of polyurethane polymer materials and are internally encapsulated with silicone oil as the pressure-sensitive liquid. When the medium pressure increases, the silicone oil is compressed and expands, and when the medium pressure decreases, the silicone oil contracts.

[0067] The volume change of silicone oil in the pressure-sensing microcapsule will drive the elastic rubber matrix 13 to deform. The elastic rubber matrix 13 adopts a blend of nitrile rubber and fluororubber with a mass ratio of 3:2, and has good elasticity and comprehensive performance. At the same time, a shape memory alloy wire woven mesh 14 with a wire diameter of 0.2-0.3mm is embedded in the elastic rubber matrix 13. When the elastic rubber matrix 13 is deformed, the shape memory alloy wire woven mesh 14 will constrain and adjust the deformation to a certain extent according to its own characteristics. When the medium pressure increases, the silicone oil expands to cause the elastic rubber matrix 13 to deform toward the valve seat 22, thereby enhancing the sealing effect between the valve disc 12 and the valve seat 22. When the medium pressure decreases, the silicone oil shrinks, and the elastic rubber matrix 13 returns to its original state under the action of the shape memory alloy wire woven mesh 14, and continues to maintain good sealing performance.

[0068] When a pressure difference occurs on both sides of the valve disc 12, the medium on the side with higher pressure enters through the pressure balancing hole 15 opened inside the valve disc 12, pushing the balancing piston 16 inside the pressure balancing hole 15 to move. The bottom of the balancing piston 16 is connected to an elastic compensation spring 17 whose bottom end is fixed on the valve disc 12. The movement of the balancing piston 16 will compress or stretch the elastic compensation spring 17. The elastic force generated by the elastic compensation spring 17 will generate a reaction force on the balancing piston 16, thereby balancing the pressure difference on both sides of the valve disc 12 and making the pressure on both sides of the valve disc 12 tend to be consistent.

[0069] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A high temperature resistant bellows stop valve with improved sealing performance, comprising a stop valve body (1), characterized in that: The top of the stop valve body (1) is connected to a gasket (2), the top of the gasket (2) is connected to a sealing cover (3), the top of the sealing cover (3) is connected to a packing gland (4), the inside of the packing gland (4), the sealing cover (3) and the stop valve body (1) are connected through a valve stem (5), the inside of the valve stem (5) is connected to a magnetic suspension guide valve stem support module, and the magnetic suspension guide valve stem support module is used to provide a suspension support force for the valve stem (5); The magnetic suspension guide valve stem support module comprises a high temperature resistant permanent magnet (6) embedded in the valve stem (5) near the sealing cover (3), the high temperature resistant permanent magnet (6) being evenly distributed in a circumference at the valve stem (5) near the sealing cover (3), and the number of the high temperature resistant permanent magnets (6) is 6-8; A fixing bracket (7) is embedded in the inner surface of the sealing cover (3), and a high temperature resistant electromagnetic coil (8) is wound in layers inside the sealing cover (3), and the fixing bracket (7) is located on one side of the high temperature resistant electromagnetic coil (8). The high temperature resistant electromagnetic coil (8) is wound in a layered spiral manner, with each layer having 20 to 30 turns and 3 to 5 layers. The contact surface between the high temperature resistant permanent magnet (6) and the valve stem (5) and the contact surface between the high temperature resistant electromagnetic coil (8) and the sealing cover (3) are provided with an insulating heat conductive layer.

2. A high temperature resistant bellows stop valve with improved sealing performance according to claim 1, characterized in that: A displacement sensor, a speed sensor and a temperature sensor are arranged inside the valve stem (5); A microprocessor and a sensor signal acquisition component are arranged inside the sealing cover (3). The microprocessor and the sensor signal acquisition component are connected to the electromagnetic coil via a cable and are used to receive signals from the displacement sensor, the speed sensor and the temperature sensor in real time. According to the control algorithm, the current magnitude and direction of the electromagnetic coil are adjusted to achieve control of the suspension force and guidance of the valve stem (5).

3. A high temperature resistant bellows stop valve with improved sealing performance according to claim 1, characterized in that: A liquid inlet (18) is provided on one side of the stop valve body (1), and an anti-scouring flow-diverting buffer inner core (19) is connected to the inside of the liquid inlet (18). The anti-scouring flow-diverting buffer inner core (19) is in a truncated cone shape, and evenly arranged inclined flow-diverting holes are provided inside the anti-scouring flow-diverting buffer inner core (19); A liquid outlet (20) is provided on the other side of the stop valve body (1); The top of the valve stem (5) is connected to a hand wheel (21); The bottom of the valve stem (5) is connected to a valve seat (22).

4. A high temperature resistant bellows stop valve with improved sealing performance according to claim 1, characterized in that: The interior of the packing gland (4) near the valve stem (5) is filled with sealing packing (9); A sealing bellows (10) is connected to the outer surface of the valve stem (5), and the sealing bellows (10) is located on the inner side of the sealing cover (3).

5. A high temperature resistant bellows stop valve with improved sealing performance according to claim 4, characterized in that: A cleaning scraper (11) is connected to the interior of the stop valve body (1), and the cleaning scraper (11) is located below the sealing bellows (10). The cleaning scraper (11) is annular and is fixed to the interior of the stop valve body (1) by bolts. The inner diameter of the cleaning scraper (11) matches the outer diameter of the valve stem (5), and a micro-tooth structure is provided on the inner surface of the cleaning scraper (11).

6. A high temperature resistant bellows stop valve with improved sealing performance according to claim 1, characterized in that: The stop valve body (1) is internally connected to a valve flap (12), and the valve flap (12) is internally connected to an adaptive elastic sealing module, the adaptive elastic sealing module being used to achieve dynamic sealing according to pressure changes of the medium inside the stop valve body (1); The adaptive elastic sealing module comprises an elastic rubber matrix (13) connected to the inside of the valve flap (12), and a shape memory alloy wire braided mesh (14) is embedded in the inside of the elastic rubber matrix (13); Pressure sensing microcapsules are evenly dispersed inside the elastic rubber matrix (13), the pressure sensing microcapsules are made of polyurethane polymer material, and silicone oil is encapsulated inside the pressure sensing microcapsules as a pressure sensitive liquid.

7. A high temperature resistant bellows stop valve with improved sealing performance according to claim 6, characterized in that: The elastic rubber matrix (13) is a blend of nitrile rubber and fluororubber, wherein the mass ratio of nitrile rubber to fluororubber is 3:2; The shape memory alloy wire braided mesh (14) is woven in a plain weave manner, and the wire diameter is 0.2-0.3 mm.

8. The high temperature resistant bellows stop valve with improved sealing performance according to claim 6, characterized in that: A pressure balancing compensation module is arranged inside the valve flap (12), and the pressure balancing compensation module is used to balance the pressure difference on both sides of the valve flap (12); The pressure balance compensation module comprises a pressure balance hole (15) opened inside the valve disc (12); a balance piston (16) is connected inside the pressure balance hole (15); an elastic compensation spring (17) is connected to the bottom of the balance piston (16); and the bottom end of the elastic compensation spring (17) is fixed on the valve disc (12).

9. A method for using a high temperature resistant bellows stop valve with improved sealing performance, applicable to the high temperature resistant bellows stop valve with improved sealing performance as claimed in any one of claims 1 to 3, characterized in that: The use of the stop valve includes: S1. Turn the hand wheel (21) clockwise to move the valve stem (5) upward and open the valve. S2, the medium flows in from the liquid inlet (18), and is diverted and buffered through the inclined diverter holes of the anti-scour diverter buffer inner core (19); S3. Turn the hand wheel (21) counterclockwise to move the valve stem (5) downward, closing and opening the valve.

10. A method for using a high temperature resistant bellows stop valve with improved sealing performance according to claim 9, characterized in that: In S3, it also includes: S31, the displacement sensor, the speed sensor and the temperature sensor monitor the position, movement speed and temperature of the valve stem (5) in real time, and transmit the collected data to the microprocessor and sensor signal collection component inside the sealing cover (3); S32, the microprocessor analyzes and processes the data and adjusts the current magnitude and direction of the high temperature resistant electromagnetic coil (8) through the cable according to the analysis result; S33, 6 to 8 high temperature resistant permanent magnets (6) are evenly distributed around the valve stem (5) near the sealing cover (3). When the high temperature resistant electromagnetic coil (8) generates a magnetic field, the magnetic field interacts with the magnetic field of the high temperature resistant permanent magnet (6). When the magnetic field forces between the two reach a balance, a suspension support force is provided for the valve stem (5).

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