Automatic regulating valve for high-temperature gas flow

Abstract

The invention discloses an automatic regulating valve for high-temperature gas flow, relates to the technical field of valves, and solves the problems of low response speed and poor sealing and heat insulation capabilities in the prior art. The flow limiting valve comprises a valve body, a flow limiting nozzle structure is arranged on the valve body, a cavity is formed in the flow limiting nozzle structure, a flow channel opening I and a flow channel opening II which are both communicated with the cavity are formed in the flow limiting nozzle structure, an electromagnet is connected to the valve body, the movable end of the electromagnet is connected with one end of a shifting fork, the other end of the shifting fork extends into the cavity, and the end of the shifting fork is matched with the flow channel opening II. The movable end of the electromagnet can drive the shifting fork to control the opening and closing degree of the runner opening II; a sealing heat insulation structure used for being matched with the shifting fork is arranged on the cavity. By arranging the sealing heat insulation structure, the sealing heat insulation structure is directly matched with the shifting fork, sealing and heat insulation are formed, and the use requirements of high-temperature medium conveying scenes are met. The end of the shifting fork is directly matched with the runner opening II to regulate and control flow, the design of a valve element is omitted, occupied space is saved, the structure is simplified, meanwhile, friction force in the regulation and control process is reduced, the requirement for driving force of the electromagnetic valve is reduced, and the response time of regulation and control is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of valves, in particular to an automatic high-temperature gas flow regulating valve. Background Art

[0002] In modern automatic control or hydraulic control systems, control valves play a very important role. Control valves determine the correct distribution and control of the flow medium. Due to different application scenarios, the working conditions such as temperature, pressure, corrosion and pollution that control valves are subjected to are more severe than those of hydraulic system components. When it controls the flow of fluid, it must operate stably and reliably.

[0003] For example, the Chinese invention patent with the publication number CN112555441A discloses a large flow proportional throttle valve, including a connecting plate, a rotating electromagnet and a valve body are arranged on the connecting plate, a valve core is rotatably connected in the valve body, an upper lever connected to the output shaft of the rotating electromagnet and a lower fork connected to the valve core and used to drive the valve core to rotate, an oil inlet and an oil outlet are arranged on the valve body, spiral grooves are symmetrically arranged on both sides of the valve core, a mounting base is arranged on the connecting plate, a positioning rod is arranged on the mounting base, the upper end of the upper lever is rotatably connected to the positioning rod, a reset spring for driving the upper lever to reset is arranged on the positioning rod, a circular arc block is arranged at the lower end of the upper lever, and a U-shaped fork head matching the circular arc block is arranged at the upper end of the lower fork. The invention can realize stable control of large flow and can achieve certain control accuracy and repeatability.

[0004] This solution also uses an upper lever and a lower fork to drive the valve core to move and achieve flow regulation, but lacks the corresponding sealing and thermal insulation structure and can only meet the needs of low-temperature environments. In the transportation scenario of high-temperature fluids, excessive heat transfer is prone to occur, resulting in electromagnetic failure due to poor sealing and thermal insulation effects.

[0005] The Chinese invention patent with publication number CN107906221A discloses a two-position three-way reversing valve and a reversing method for a low-flow liquid nitrogen cryogenic system. The reversing valve is a single-electrically controlled lever bellows valve driven by an electromagnet, including a valve body structure, a bellows sealing structure, a lever hinge force-enhancing structure, and an electromagnet force-generating structure. The valve body structure includes a valve seat, a double-conical movable valve stem, an upper conical sealing seat, a lower conical sealing seat, and a movable valve core connecting rod. The bellows sealing structure includes a bellows and an elastic connector. The lever hinge force-enhancing structure includes a first transmission piston, a force-enhancing connecting rod, and a second transmission piston.

[0006] This invention uses the stop valve principle to achieve the reversal of ultra-low temperature fluid by switching the double-cone movable valve stem to seal and open the upper cone sealing seat and the lower cone sealing seat. However, its thermal insulation capacity is limited and it is only suitable for use in ultra-low temperature environments, especially in small flow and low temperature environments. At the same time, its integration is limited and the space volume is large.

[0007] It can be seen that the valve bodies of the above-mentioned prior art are mostly designed based on low-temperature transportation environments, and are not applicable in high-temperature fluid medium transportation environments, especially in high-temperature medium transportation pipelines above 1,000 degrees. The seal in a high-temperature working environment generally adopts a hard seal. The existing valve body uses an electromagnet to drive the valve core to move for flow control. The valve core must overcome friction and maintain sealing. The control trigger force is large and the response speed is slow.

[0008] Secondly, in the existing valve body, the relevant flow channel structure and flow nozzle structure are directly processed and opened on the valve body, and the flow channel structure is complex and requires high precision processing. When the valve body structure is large and is processed and formed in one piece, the processing accuracy is difficult to control. Summary of the invention

[0009] In view of the deficiencies in the above-mentioned background technology, the present invention proposes a high-temperature gas flow automatic regulating valve, which solves the problems of slow response speed and poor sealing and heat insulation ability in the prior art.

[0010] The technical solution of the present invention is implemented as follows: a high-temperature gas flow automatic regulating valve includes a valve body, a flow limiting nozzle structure is provided on the valve body, a chamber is provided on the flow limiting nozzle structure, and a flow channel opening I and a flow channel opening II are provided on the flow limiting nozzle structure, both of which are connected to the chamber, an electromagnet is connected to the valve body, the active end of the electromagnet is connected to one end of a shift fork, the other end of the shift fork extends into the chamber and the end portion cooperates with the flow channel opening II, and the active end of the electromagnet can drive the shift fork to control the opening and closing degree of the flow channel opening II; the chamber is provided with a sealing and heat-insulating structure for cooperating with the shift fork.

[0011] Preferably, the flow limiting nozzle structure includes an adjusting seat, a chamber is opened on the adjusting seat, a pair of conical structure holes connecting the chamber are symmetrically opened on the adjusting seat, the conical structure holes are each penetrated by a flow limiting nozzle, and the flow limiting nozzle is provided with a throttling hole for connecting the chamber and the flow channel opening II, and the shift fork is arranged between the two flow limiting nozzles.

[0012] Preferably, the flow limiting nozzle and the regulating seat are welded by vacuum electron beam welding. A filter corresponding to the flow channel opening I is arranged in the chamber.

[0013] Preferably, the upper end of the shift fork is hinged to the movable end of the electromagnet, and the middle part of the shift fork is hinged to the adjustment seat or the valve body; one end of the chamber is open, and the shift fork is inserted into the chamber from the opening.

[0014] Preferably, the sealing and heat-insulating structure includes a limit block and a sealing gasket which are fixed in sequence at the opening of the chamber, the inner rings of the limit block and the sealing gasket are matched with the shift fork, the valve body is provided with a stop block which matches with the opening end of the chamber, and an aerogel layer is provided between the stop block and the sealing gasket.

[0015] Preferably, the sealing gasket is a flexible graphite sealing gasket, the limit block is provided with a slope for limiting the rotation angle of the shift fork, the shift fork is provided with a protrusion, and the protrusion cooperates with the flexible graphite sealing gasket.

[0016] Preferably, the valve body includes an I-shaped support, a connecting seat is provided on the support, both the connecting seat and the support are connected to the flow limiting nozzle group structure, and the support is connected to a jacket covering the outside of the electromagnet; an air gap is left between the jacket and the electromagnet, and an opening is provided on the support for satisfying the connection activity between the electromagnet and the fork, and the air gap is connected to the opening.

[0017] Preferably, the electromagnet comprises a coil connected to a support, a moving iron core is slidably provided on the coil, the moving iron core is connected to one end of a connecting rod, the middle of the connecting rod is hinged to the upper end of the shift fork, the other end of the connecting rod cooperates with a spring, the other end of the spring cooperates with a top block, the top block is slidably provided on the support, a knob cooperating with the top block is provided on the support, the knob is used to push the top block to slide and thus adjust the initial position of the spring. The support is provided with an air hole.

[0018] The beneficial effects of the present invention are as follows: by providing a sealing and heat-insulating structure, the sealing and heat-insulating structure is directly matched with the shift fork to form a seal and heat insulation to meet the use requirements of high-temperature medium transportation scenarios.

[0019] The regulating valve is provided with an additional flow limiting nozzle structure for carrying fluid on the valve body, and the flow limiting nozzle structure for carrying fluid is separately designed and assembled to be connected with the supporting base of the valve body itself, thereby avoiding the processing error and reduced thermal insulation effect that are easily caused by directly opening the corresponding fluid-carrying structure on the valve body in the prior art. The flow channel openings I and II and the chamber height are concentrated on the flow limiting nozzle structure, and the processing accuracy can be improved by separate processing, while the overall assembly space is reduced to meet the lightweight requirements.

[0020] The degree of opening and closing between the flow channel ports II is directly controlled by the fork position, and then the flow path between the flow channel ports I and II is controlled to achieve the regulation and control of the flow. The flow is regulated by directly cooperating with the flow channel ports II with the fork end, eliminating the design of the valve core, which not only saves space and simplifies the structure, but also reduces the friction during the regulation process, reduces the driving force requirements of the solenoid valve, and improves the response time of the regulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0022] Figure 1 This is a schematic diagram of the structure of the regulating valve of the present invention; Figure 2 For the present invention Figure 1 A schematic diagram of the structure enlargement in the middle; In the figure: 1: valve body, 2: flow limiting nozzle structure, 3: chamber, 4: flow channel opening I, 5: flow channel opening II, 6: electromagnet, 7: fork, 8: sealing and heat insulation structure, 9: adjustment seat, 10: flow limiting nozzle, 11: flow channel, 12: filter, 13: limit block, 14: sealing gasket, 15: stopper, 16: aerogel layer, 17: slope, 18: raised part, 19: support, 20: connecting seat, 21: outer sleeve, 22: coil, 23: moving iron core, 24: connecting rod, 25: spring, 26: top block, 27: knob, 28: air hole. DETAILED DESCRIPTION

[0023] 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.

[0024] like Figure 1 As shown, in Example 1, a high-temperature gas flow automatic regulating valve comprises a valve body 1, a flow limiting nozzle structure 2 is provided on the valve body 1, a chamber 3 is provided on the flow limiting nozzle structure 2, and a flow channel opening Ⅰ4 and a flow channel opening Ⅱ5 both of which are connected to the chamber 3 are provided on the flow limiting nozzle structure 2. In order to avoid the problems of processing errors and reduced thermal insulation effect that are easily caused by the method of directly opening a corresponding fluid-carrying structure on the valve body in the prior art, in this embodiment, the chamber 3, the flow channel opening Ⅰ4 and the flow channel opening Ⅱ5 for carrying the fluid are opened on the flow limiting nozzle structure, and the flow limiting nozzle structure for carrying the fluid is separately designed and assembled and connected with the supporting foundation of the valve body itself, so that the flow channel opening Ⅰ4 and the flow channel opening Ⅱ5 and the chamber height are concentrated on the flow limiting nozzle structure, and the processing accuracy is improved by the split processing method, while the overall assembly space is reduced to meet the lightweight requirements.

[0025] In addition, an electromagnet 6 is connected to the valve body 1, and the active end of the electromagnet 6 is connected to one end of the fork 7, and the other end of the fork 7 extends into the chamber 2 and the end cooperates with the flow channel port Ⅱ5, and the active end of the electromagnet 6 can drive the fork 7 to control the opening and closing degree of the flow channel port Ⅱ5. The opening and closing degree of the flow channel port Ⅱ5 is directly controlled by changing the position of the fork 7, and then the degree of connection between the flow channel port Ⅰ4 and the flow channel port Ⅱ5 is controlled to achieve the regulation and control of the flow. The flow rate is regulated by directly cooperating with the flow channel port Ⅱ5 by the end of the fork 7, and the design of the valve core is cancelled, which not only saves space occupation, simplifies the structure, reduces the driving friction during the regulation process, reduces the driving force requirements of the electromagnetic valve, and improves the response time of the regulation.

[0026] In addition, a sealing and heat-insulating structure 8 for cooperating with the shift fork 7 is provided on the chamber 2. The sealing and heat-insulating structure is directly cooperated with the shift fork to form a seal and heat insulation, thereby improving the heat insulation capacity, so that it can be suitable for high-temperature scenes.

[0027] Embodiment 2, on the basis of embodiment 1, the flow limiting nozzle structure 2 includes an adjusting seat 9, a chamber 3 is opened on the adjusting seat 9, a pair of conical structure holes connecting the chamber 3 are symmetrically opened on the adjusting seat 9, a flow limiting nozzle 10 is pierced through the conical structure holes, and the flow limiting nozzle 10 is provided with a throttling hole 11 for connecting the chamber 3 and the flow channel opening II5, the fork 7 is located between the two flow limiting nozzles 10, and the lower end of the fork is used to cooperate with the two throttling holes.

[0028] In addition, the upper end of the fork 7 is hinged to the movable end of the electromagnet 6, and the middle part of the fork 7 is hinged to the adjustment seat 9 or the valve body 1. In this embodiment, the fork 7 is hinged to the adjustment seat 9. One end of the chamber 3 is open, and the fork 7 is inserted into the chamber 3 from the opening, and the lower end of the fork 7 is arranged between the two flow limiting nozzles 10, so that the middle part of the fork 7 only needs a small range of movement to meet the switching movement of the lower end of the fork 7 between the two flow limiting nozzles 10 to achieve flow regulation.

[0029] As a further implementation method, the flow limiting nozzle 10 and the adjustment seat 9 are processed separately to obtain higher processing accuracy, and then the flow limiting nozzle 10 is welded at the end face by vacuum electron beam welding after the burrs are removed. In this embodiment, the dimensional and geometric tolerances of 0.005 mm or more can be obtained by processing the flow limiting nozzle 10 separately, and the characteristics of vacuum electron beam welding with small deformation and high precision are used to avoid the problems of difficult burr removal after traditional one-piece processing, redundant materials generated during later use, and errors caused by welding deformation.

[0030] In addition, a filter 12 is provided in the chamber 3 for corresponding to the flow channel opening Ⅰ4. In actual use, the throttle holes on the two flow limiting nozzles are respectively connected to the two flow channel openings Ⅱ5, the flow channel opening Ⅱ5 serves as the liquid outlet, and the flow channel opening Ⅰ4 serves as the liquid inlet. The medium enters the chamber through the flow channel opening Ⅰ4. The filter 12 is provided to filter the medium, and the medium flow entering the throttle holes 11 of the flow limiting nozzles on both sides is adjusted by the distance between the lower end of the fork and the two flow limiting nozzles, so as to finally achieve the purpose of adjusting the medium flow out through the flow channel opening Ⅱ5.

[0031] This valve can realize the movable end of the solenoid valve to drive the fork to move through mechanical connection, realize the function of two-position three-way, and highly concentrate the flow channel port Ⅰ4, filter 12, flow limiting nozzle 10, throttle hole 11 and flow channel port Ⅱ5 at the inlet through the flow limiting nozzle structure 2, reduce the assembly space and product weight, and meet the requirements of lightweight design. The opening of the throttle hole is controlled by the gap between the lower end of the fork and the flow limiting nozzle 10 to adjust the flow out of the two flow channel ports Ⅱ5, with high reliability. At the same time, each structural component is processed and integrated separately, with higher precision.

[0032] The movable end of the electromagnet drives the shift fork to rotate while moving, directly acting on the flow limiting nozzle structure 2 to adjust the flow rate, and uses the size of the gap to control the opening of the throttle hole to adjust the flow rate of the two outlets. It has high reliability and a short switching time between the two outlets, which can be completed within 3ms, solving the problem of long response time of traditional high-temperature and high-pressure valves.

[0033] Embodiment 3, as Figure 2 As shown, on the basis of Example 2, the sealing and heat-insulating structure 8 includes a stopper 13 and a sealing gasket 14 fixedly arranged at the opening of the chamber 3 in sequence, the sealing gasket 14 and the inner ring of the stopper 13 are matched with the shift fork 7, the valve body 1 is provided with a stopper 15 matched with the opening end of the chamber, the stopper 15 is connected to the valve body by bolts, and an aerogel layer 16 is provided between the stopper 15 and the sealing gasket 14. In this embodiment, the aerogel layer can be selected from conventional aerogel materials such as silica aerogel, zirconia aerogel, carbide aerogel or composite aerogel.

[0034] In this embodiment, the sealing gasket 14 is a flexible graphite sealing gasket, which can maintain a good seal under high temperature conditions and has a self-lubricating effect. When in use, this embodiment uses flexible graphite to play a sealing role, and can also play a certain active lubrication role for the fork. In addition, through the high temperature isolation of the outer aerogel layer, it plays a good role in sealing and isolating heat, reducing the heat transfer of the transported medium to the electromagnet through the cavity, and ensuring that the electromagnet can work normally in the high-temperature medium transportation scenario. In actual use, this valve adopts a combined sealing physical isolation structure of aerogel and graphite, and physical insulation isolates the electromagnetic coil and the medium to prevent the high-temperature medium from affecting the coil performance. It can be used in an environment with a medium of 1700°C.

[0035] Correspondingly, in this embodiment, the shift fork is made of a material with low thermal conductivity, such as a ceramic material, so as to further reduce the heat transfer from the shift fork to the electromagnet.

[0036] As a further implementation method, a slope 17 for limiting the rotation angle of the fork 7 is provided on the limit block 13. In this embodiment, the limit block is an annular structure, and the inner ring surface of the annular structure limit block is the slope 17. When the fork rotates around the hinged portion between it and the adjustment seat 9, it stops when it rotates to a posture in contact with the slope, and the rotation range of the fork is limited by the limit block.

[0037] As a further embodiment, a limit ring plate 30 is provided between the limit block and the chamber, and the limit ring plate can support the limit block from the inside, and together with the external stopper 15 determine the position of the limit block, the sealing gasket and the aerogel layer.

[0038] As a further optional embodiment, a protrusion 18 is provided on the fork 7, and the protrusion 18 cooperates with the flexible graphite sealing gasket, and the protrusion can better fit and contact the top of the flexible graphite sealing gasket to improve the sealing ability. The limiting ring plate can support the sealing gasket from the inside and abut against the bottom of the protrusion to better form a seal.

[0039] Embodiment 4, on the basis of embodiment 3, the valve body 1 includes an I-shaped support 19, a connecting seat 20 is provided on the support 19, and the connecting seat 20 and the support 19 are both connected to the adjustment seat 9 of the flow limiting nozzle group structure 2. The support is set to be an I-shaped support. On the one hand, the upper part of the I-shaped support provides a fixing foundation for the electromagnet, and the lower part of the I-shaped support provides an installation space for the flow limiting nozzle structure. At the same time, the narrowing of the middle section can further reduce the heat conduction of the flow limiting nozzle structure to the electromagnet at the upper part through the support.

[0040] In this embodiment, a groove is provided at the lower part of the I-shaped support 19, the connecting seat 20 is located in the groove and a gap is left between the connecting seat 20 and the support 19, and corresponding openings are provided in the middle of the connecting seat 20 and the support 19 to meet the setting of the adjustment seat 9, and the adjustment seat 9 is inserted in the opening and connected by threads. As a further optional embodiment, an inner groove 29 is provided in the area corresponding to the opening of the adjustment seat 9 and the support 19, thereby reducing the contact area between the adjustment seat 9 and the support 19 and reducing heat transfer.

[0041] As a further embodiment, a jacket 21 covering the outside of the electromagnet 6 is connected to the support 19, the jacket plays a protective role, and an air gap 31 is left between the jacket 21 and the electromagnet 6. The support 19 is provided with an opening for satisfying the connection activity between the electromagnet 6 and the fork 7, and the air gap is connected to the opening, so that the air gap is used to connect the part of the space where the opening is located with the outside world, which is beneficial to heat dissipation.

[0042] In addition, the electromagnet 6 includes a coil 22 connected to the support 19, a gasket is provided between the coil and the support, a moving iron core 23 is slidably provided on the coil 22, the moving iron core 23 is connected to one end of a connecting rod 24, the middle part of the connecting rod 24 is hinged to the upper end of the fork 7, the connecting rod can drive the fork to move, the other end of the connecting rod 24 cooperates with a spring 25, the other end of the spring 25 cooperates with a top block 26, the top block 26 is slidably provided on the support 19, and a knob 27 cooperating with the top block 26 is provided on the support 19, and the knob 27 The supports are rotatably matched, and the knob 27 is used to push the top block 26 to slide and thereby adjust the initial position of the spring 25. In this embodiment, the inner ring of the knob 27 is threadedly matched with the top block 26, the top block 26 is fixedly connected to one end of the spring 25, and the other end of the spring 25 is fixedly connected to the end of the connecting rod 24. When adjusting the initial position of the spring 25 when the coil is powered off, the knob is rotated, and the threaded match with the left and right lower knobs drives the top block to move axially, thereby synchronously driving the spring, connecting rod, and moving iron core to their initial positions on the support.

[0043] When this embodiment is in use, when the coil 22 of the electromagnet 6 is powered off, under the action of the spring force of the spring 25, the moving iron core 23 is located on the right side. At this time, the fork 7 is limited and fixed at a certain angle under the action of the limit block 13. At this time, the gap between the fork 7 and the right throttle hole 11 becomes larger, and the gap with the left throttle hole becomes smaller, so that the flow on the left side is reduced and the flow on the right side is increased. When the electromagnet is powered on, the moving iron core 23 moves to the left under the action of the electromagnetic force, and drives the fork 7 to move through the connecting rod 24. At this time, the fork 7 is limited and fixed at a certain angle under the action of the limit block 13. At this time, the gap between the lower end of the fork and the left throttle hole 11 becomes larger, and the gap with the right side becomes smaller, so that the flow on the right side is reduced and increased on the left. Through the above actions, the opening size of the throttle hole on the flow limiting nozzle is automatically controlled, and finally the flow size flowing out through the left and right throttle holes to the flow channel port Ⅰ4 and the flow channel port Ⅱ5 is controlled. This valve realizes a fast and long-life switching between one inlet and two outlets respectively by the electromagnetic force generated by the coil powering on and the spring force of the spring.

[0044] As a further optional implementation, an air hole 28 is provided on the support 19, and the air hole corresponds to the gap between the connecting seat 20 and the support 19, so that gas can be blown into it during actual use to take away the heat in the gap, reduce the heat transfer to the support 2 through the connecting seat 20, and further achieve a certain temperature isolation purpose.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-temperature gas flow automatic regulating valve, comprising a valve body (1), characterized in that: The valve body (1) is provided with a flow limiting nozzle structure (2), the flow limiting nozzle structure (2) is provided with a chamber (3), and the flow limiting nozzle structure (2) is provided with a flow channel opening I (4) and a flow channel opening II (5) both of which are connected to the chamber (3); the valve body (1) is connected with an electromagnet (6), the movable end of the electromagnet (6) is connected to one end of a shift fork (7), the other end of the shift fork (7) extends into the chamber (2) and the end portion cooperates with the flow channel opening II (5), and the movable end of the electromagnet (6) can drive the shift fork (7) to control the opening and closing degree of the flow channel opening II (5); the chamber (2) is provided with a sealing and heat-insulating structure (8) for cooperating with the shift fork (7).

2. The high temperature gas flow automatic regulating valve according to claim 1, characterized in that: The flow limiting nozzle structure (2) comprises an adjustment seat (9), a chamber (3) is provided on the adjustment seat (9), a pair of conical structure holes communicating with the chambers are symmetrically provided on the adjustment seat (9), a flow limiting nozzle (10) is penetrated through each of the conical structure holes, and a throttling hole (11) for communicating with the chamber (3) and the flow channel opening II (5) is provided on the flow limiting nozzle (10), and a shift fork (7) is provided between the two flow limiting nozzles (10).

3. The high temperature gas flow automatic regulating valve according to claim 2, characterized in that: The current limiting nozzle (10) and the regulating seat (9) are welded by vacuum electron beam welding.

4. The high temperature gas flow automatic regulating valve according to claim 3, characterized in that: The chamber (3) is provided with a filter (12) corresponding to the flow channel opening I (4).

5. The high temperature gas flow automatic regulating valve according to any one of claims 2 to 4, characterized in that: The upper end of the shift fork (7) is hinged to the movable end of the electromagnet (6), and the middle part of the shift fork (7) is hinged to the adjustment seat (9) or the valve body (1); one end of the chamber (3) is open, and the shift fork (7) is inserted into the chamber (3) from the opening.

6. The high temperature gas flow automatic regulating valve according to claim 5, characterized in that: The sealing and heat-insulating structure (8) comprises a limit block (13) and a sealing gasket (14) which are fixed in sequence at the opening of the chamber (3); the inner rings of the limit block (13) and the sealing gasket (14) are both matched with the shift fork (7); the valve body (1) is provided with a stop block (15) which is matched with the opening end of the chamber (3); and an aerogel layer (16) is provided between the stop block (15) and the sealing gasket (14).

7. The high temperature gas flow automatic regulating valve according to claim 6, characterized in that: The sealing gasket (14) is a flexible graphite sealing gasket, the limiting block (13) is provided with a slope (17) for limiting the rotation angle of the shift fork (7), the shift fork (7) is provided with a protrusion (18), and the protrusion (18) cooperates with the flexible graphite sealing gasket.

8. The high temperature gas flow automatic regulating valve according to any one of claims 1 to 4, 6 and 7, characterized in that: The valve body (1) comprises an I-shaped support (19), a connecting seat (20) being provided on the support (19), the connecting seat (20) and the support (19) being connected to the flow limiting nozzle group structure (2), the support (19) being connected to a jacket (21) covering the outside of the electromagnet (6); an air gap is left between the jacket (21) and the electromagnet (6), the support (19) being provided with an opening for satisfying the connection activity between the electromagnet (6) and the shift fork (7), the air gap being in communication with the opening.

9. The high temperature gas flow automatic regulating valve according to claim 8, characterized in that: The electromagnet (6) comprises a coil (22) connected to a support (19), a moving iron core (23) being slidably disposed on the coil (22), the moving iron core (23) being connected to one end of a connecting rod (24), the middle portion of the connecting rod (24) being hinged to the upper end of a shift fork (7), the other end of the connecting rod (24) being matched with a spring (25), the other end of the spring (25) being matched with a top block (26), the top block (26) being slidably disposed on the support (19), the support (19) being provided with a knob (27) matched with the top block (26), the knob (27) being used to push the top block (26) to slide and thereby adjust the initial position of the spring (25).

10. The high temperature gas flow automatic regulating valve according to claim 9, characterized in that: The support (19) is provided with an air hole (28).

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