A large-diameter vibration-damping annular gap-type pressure regulating valve device for a sub-span super wind tunnel and its use method

Abstract

The present invention provides a large-diameter vibration-damping annular gap-type pressure-regulating valve device for a sub-span super wind tunnel and a method for use thereof, comprising an outer cone, an air inlet of the outer cone having an air inlet grille, and the outer cone and inner cone forming a flow area; an inlet of a pressure-regulating profile cone connected to the outer cone, the inner profile of the pressure-regulating profile cone being a combination of an arc surface and a multi-segment index profile; a piston disposed between the inner cone and the pressure-regulating profile cone, the piston end being provided with a primary seal and a secondary seal, the piston being slidably connected to the inner cone via a servo drive; a plurality of inclined rods disposed between the servo drive and the piston, the ends of the inclined rods being hingedly connected to the servo drive and the piston, respectively; and the ends of the vibration damper being hingedly connected between the inclined rods and the servo drive. The present invention can precisely adjust the pressure distribution of the flow field according to the requirements of different wind tunnel experiments, effectively reducing the mechanical impact and noise of the valve, and the vibration damping device, through coupling with the inclined rods, mitigates vibrations caused by rapid motion.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid control equipment, and in particular to a large-diameter vibration-damping annular gap type pressure regulating valve device for a sub-span super wind tunnel and a use method thereof. Background Art

[0002] Wind tunnel testing, as an important aerodynamic testing method, is widely used in aerospace, automotive, construction, and other fields. Regulating the pressure of the airflow within the wind tunnel is crucial. Conventional pressure-regulating valves, while ensuring accuracy and stability, can also lead to problems such as turbulent airflow, excessive noise, and structural vibration.

[0003] Currently, conventional industrial-grade pressure regulating valves have a flow regulation accuracy of only 1-5%, and noise levels exceeding 170dB, making them difficult to meet the precise pressure regulation and low noise requirements of wind tunnel experiments. Traditional wind tunnel pressure regulating valves often use an annular gap pressure regulating structure, but these valves suffer from drawbacks such as airflow separation, high valve noise, and seal leakage, making them incapable of achieving the precise flow field pressure regulation and low noise requirements. Summary of the Invention

[0004] The purpose of the present invention is to provide a large-diameter vibration-damping annular gap-type pressure-regulating valve device for a sub-span super wind tunnel and a method of use, aiming to solve the problems of airflow turbulence, high noise, seal leakage, structural vibration, etc. in the prior art, thereby achieving precise regulation of the flow field pressure in wind tunnel experiments, and being able to effectively reduce noise, reduce gas leakage, and avoid wind tunnel resonance.

[0005] According to one object of the present invention, the present invention provides a large-diameter vibration-damping annular gap-type pressure-regulating valve device for a sub-span super wind tunnel, comprising an outer cone, an inner cone, a pressure-regulating profile cone, a piston, a servo drive device, a diagonal rod and a shock absorber, wherein the air inlet of the outer cone is provided with an air inlet grille, the inner cone is arranged inside the outer cone, and the outer cone and the inner cone form a circulation area; the inlet of the pressure-regulating profile cone is connected to the outer cone, the outlet of the pressure-regulating profile cone is connected to the outlet flange, and the inner profile of the pressure-regulating profile cone is a circular arc surface and a multi-segment index combination profile; a piston is provided between the inner cone and the pressure-regulating profile cone, the piston end is provided with a primary seal and a secondary seal, and the piston is slidably connected to the inner cone through a servo drive device; a plurality of diagonal rods are provided between the servo drive device and the piston, the two ends of the diagonal rod are respectively hingedly connected to the servo drive device and the piston, and the two ends of the shock absorber are respectively hingedly connected between the diagonal rod and the servo drive device.

[0006] Furthermore, the air intake grille is composed of multiple layers of sintered metal mesh blocks, the mesh size of the air intake grille ranges from 10 to 300 meshes, the noise reduction frequency of the sintered metal mesh block noise reduction arc plate is 0 to 40,000 Hz, and the air permeability is 30% to 100%.

[0007] Furthermore, the servo drive device includes a servo hydraulic cylinder, a hydraulic rod, a spline shaft, a spline sleeve and a displacement sensor. The spline shaft is fixed to the inner cone through a support. The spline shaft and the spline sleeve form a high-torque ball spline. Spherical hinge seats are provided at both ends of the diagonal rod. The two spherical hinge seats are connected to the diagonal rod through self-locking trapezoidal threads, and the rotation directions of the self-locking trapezoidal threads of the spherical hinge seats at both ends are opposite. An anti-loosening device is provided between the spherical hinge seat and the diagonal rod. One end of the diagonal rod is connected to the piston through the spherical hinge seat, and the other end of the diagonal rod is hinged to the spline sleeve. The spline sleeve is driven to slide back and forth relative to the spline shaft by the hydraulic rod, and finally the diagonal rod is driven to drive the piston axially.

[0008] Furthermore, the servo hydraulic cylinder is a double-acting servo hydraulic cylinder, which adopts dual servo hydraulic valves to coarse and fine control the flow to achieve precise pressure regulation and emergency shutdown functions. The servo hydraulic cylinder is based on the double closed-loop PID servo control strategy of the valve characteristics, with the outer loop as the total pressure and the inner loop as the valve position. The parabolic speed curve is used to optimize the valve core switching vehicle, thereby avoiding the rapid impact and damage of the valve core to the valve structure.

[0009] Furthermore, the outer cone is designed to have a cylinder-cone-cylinder structure, the cone angle of the outer cone is less than 30°, the outer cone is connected to the inner cone via an even number of support ribs, and the cone angle of the inner cone is less than 60°.

[0010] Furthermore, the primary seal is a T-shaped structure with an inflation port and a draft angle, and the secondary seal is a U-shaped structure. The primary seal and the secondary seal can be arranged in multiple arrangements to increase sealing redundancy and reliability.

[0011] Furthermore, the piston is made of cast aluminum or steel, and the outlet of the piston is evenly distributed with tiny air holes connected to the main seal.

[0012] Furthermore, the shock absorber adopts a permanent magnet adjustable magnetorheological damper or a viscous fluid damper, a magnetorheological damper or a viscous shear damper.

[0013] Furthermore, the number of the shock absorbers is n, where n is any integer between 1 and 4. The shock absorbers are used in pairs with the diagonal tie rods, and the center lines of the shock absorbers and the diagonal tie rods are perpendicular to each other.

[0014] According to another object of the present invention, the present invention provides a method for using the above-mentioned large-diameter vibration-damping annular gap type pressure regulating valve device for a sub-span super wind tunnel, comprising the following steps:

[0015] The two ends of the pressure regulating cone are connected to the outer cone and the outlet flange respectively, and the inner cone and the outer cone form a fluid flow area;

[0016] The servo drive device axially drives the spline sleeve to drive the inclined rod and ultimately drives the piston to move axially. The displacement sensor provides real-time feedback of the axial position of the piston. The flow field pressure is precisely adjusted by the change in the channel cross-sectional area of ​​the piston and the pressure-regulating surface cone caused by the change in the axial displacement of the piston and the pressure-regulating surface cone.

[0017] The air intake grille at the air inlet stabilizes the flow and reduces airflow pulsation. The flow field outlet has no support to avoid structural vibration caused by flow separation. The spline sleeve avoids circumferential vibration of the piston. The shock absorber avoids bending deformation of the inclined rod and achieves vibration reduction. The main seal and secondary seal of the piston use pipeline gas to achieve inflation sealing.

[0018] The technical solution of this invention enables real-time adjustment of flow field pressure based on the requirements of wind tunnel experiments. It exhibits excellent fluid dynamics and structural durability, ensuring precise control and stable operation, especially under high-frequency regulation. Through simple adjustments and control, the flow field pressure distribution can be precisely adjusted to meet the needs of different wind tunnel experiments. During high-flow rate regulation, the mechanical impact and noise of the valve are effectively reduced. The vibration damping device, coupled with the diagonal tie rod, mitigates vibration caused by rapid movement, thereby ensuring the long-term stability and reliability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 Schematic diagram of the overall structure of an embodiment of the present invention;

[0021] Figure 2 This is a schematic side view of the overall structure of an embodiment of the present invention in the direction P;

[0022] Figure 3 This is a schematic diagram of the overall structure 3 / 4 of an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the detachable primary and secondary seal structures at both ends of the piston according to an embodiment of the present invention;

[0024] In the figure: 1. Air intake grille; 2. Inlet flange; 3. Outer cone; 4. Support rib; 5. Shock absorber; 6. Diagonal brace; 7. Diagonal brace support; 8. Pressure-regulating cone; 9. Outlet flange; 10. Secondary seal cover; 11. Secondary seal; 12. Main seal pressure plate; 13. First main seal panel; 14. Second main seal panel; 15. Main seal; 16. Piston; 17. Spline sleeve; 18. Spline shaft; 19. Support; 20. Inner cone; 21. Servo hydraulic cylinder; 22. Hydraulic rod; 23. Displacement sensor; 24. Protective cover. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying 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 direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a communication between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0028] Example 1

[0029] like Figure 1-Figure 4 As shown,

[0030] A sub-span super wind tunnel large-caliber vibration-damping annular gap type pressure regulating valve device, comprising an outer cone 3, an inner cone 20, a pressure regulating profile cone 8, a piston 16 and a servo drive device, wherein:

[0031] The air inlet of the outer cone 3 is provided with an air inlet grille 1, and the end of the outer cone 3 is provided with an inlet flange 2, which is a standard gas pressure-bearing flange structure.

[0032] One end of the pressure-regulating profile cone 8 is connected to the outer cone 3, and the other end is connected to the outlet flange 9. The inner profile of the pressure-regulating profile cone 8 is a combination of an arc surface and a multi-segment exponential profile. Its inlet is connected to the outer cone 3 by welding or flanges, and its outlet is connected to the outlet flange 9. The inlet flange 2 and outlet flange 9 are determined based on the flow rate and pressure regulation characteristics of the sub-span super wind tunnel, and preferably have similar diameters.

[0033] The inner cone 20 is positioned within the outer cone 3, forming a flow area with the two. The outer cone 3 and inner cone 20 are designed as a cylinder-cone-cylinder structure, with the outer cone 3 having a taper angle of less than 30°, ensuring smooth airflow within the channel. The outer cone 3 is connected to the inner cone 20 via an even number of support ribs 4. The inner cone 20 also has a cone-cylinder structure with a taper angle of less than 60°. The combined flow area is equivalent to the inlet area.

[0034] A piston 16 is provided at the inner end of the inner cone 20. The piston 16 is slidably connected to the inner cone 20 through a servo drive device. The piston 16 is arranged between the inner cone 20 and the pressure-regulating profile cone 8. The change in the axial displacement of the piston 16 and the pressure-regulating profile cone 8 causes the change in the channel cross-sectional area of ​​the piston 16 and the pressure-regulating profile cone 8 to achieve precise adjustment of the flow field pressure.

[0035] Specifically, the servo drive device includes a servo hydraulic cylinder 21, a hydraulic rod 22 and a displacement sensor 23. The servo hydraulic cylinder 21 is fixed in the middle of the inner cone 20. The hydraulic rod 22 is connected to the servo hydraulic cylinder 21 and performs linear reciprocating motion under the drive of the servo hydraulic cylinder 21.

[0036] In this embodiment, the pressure-regulating cone 8 is used to adjust the flow field pressure, and the servo hydraulic cylinder 21 is used to drive the piston 16 for precise pressure regulation. The servo hydraulic cylinder 21, hydraulic rod 22, and displacement sensor 23 form a servo drive device. This device uses a precise PID control strategy to adjust the valve position, optimize the valve core's opening and closing process, and prevent impact damage to the valve.

[0037] A support 19 is also fixed inside the inner cone 20, and a spline shaft 18 is fixed on the support 19. A spline sleeve 17 is slidably connected to the spline shaft 18, and the spline sleeve 17 is fixedly connected to the end of the hydraulic rod 22. The hydraulic rod 22 can drive the spline sleeve 17 to slide back and forth relative to the spline shaft 18.

[0038] Several diagonal tie rods 6 are hingedly connected to the outer wall of the spline sleeve 17. The other ends of the diagonal tie rods 6 are hingedly connected to the piston 16. A servo drive device consisting of a servo hydraulic cylinder 21 and a hydraulic rod 22 axially drives the spline sleeve 17, driving the diagonal tie rods 6 and ultimately the piston 16 in axial motion. A displacement sensor 23 provides real-time feedback on the axial position of the piston 16.

[0039] In this embodiment, the diagonal tie rod 6 is a rod with spherical hinged lugs at each end. The lugs are connected to the rod via trapezoidal threads, providing self-locking and length-adjustable features. The self-locking trapezoidal threads connecting the spherical hinged lugs to the diagonal tie rod at each end rotate in opposite directions and are equipped with a locking device. They are evenly spaced along the circumference (six in this embodiment). One end is connected to the piston 16 via the diagonal tie rod support 7, and the other end is connected to the splined sleeve 17.

[0040] The servo hydraulic cylinder 21 drives the spline sleeve 17 through the hydraulic rod 22, which drives the movement between the diagonal tie rod 6 and the piston 16. The position of the piston is precisely adjusted through the displacement sensor 23 with real-time feedback, thereby adjusting the channel cross-sectional area of ​​the pressure-regulating profile cone and achieving precise control of the flow field pressure.

[0041] The piston drive unit consists of a servo hydraulic cylinder 21, a hydraulic rod 22, and a displacement sensor 23. This double-acting servo hydraulic cylinder utilizes dual servo hydraulic valves for coarse and fine flow control, achieving precise pressure regulation and emergency shutdown. A dual closed-loop PID servo control strategy, with the outer loop representing total pressure and the inner loop representing valve position, is based on valve characteristics. A parabolic velocity curve is used to optimize the valve spool's opening and closing, preventing damage to the valve structure caused by rapid impact from the valve spool. One end of the hydraulic rod 22 is connected to the splined sleeve 17, and the other end is connected to the displacement sensor 23, which monitors the piston's position in real time.

[0042] A protective cover 24 is provided in front of the position sensor 23 to protect the position sensor 23 from airflow impact.

[0043] In this embodiment, the air intake grille 1 is used to stabilize flow and reduce airflow pulsation. The flow field outlet is unsupported to prevent structural vibration caused by flow separation. The air intake grille 1 utilizes a multi-layer sintered metal mesh with a mesh size of 10-300, effectively stabilizing flow and reducing airflow pulsation. The noise reduction frequency of the sintered metal mesh arc plate is 0-40,000 Hz, and the air permeability of the sintered metal mesh arc plate is 30%-100%.

[0044] In this embodiment, the provision of a splined sleeve 17 prevents circumferential vibration of the piston 16. The piston 16 is preferably cast aluminum to reduce mass. When large structures exceed the processing capacity of cast aluminum, ordinary steel can be used. The outlet is uniformly distributed with tiny air holes connected to the main seal 15, which utilizes high-pressure gas in the pipeline to achieve a two-way inflation seal.

[0045] The spline sleeve 17 and the spline shaft 18 form a high-torque ball spline. The rolling friction reduces the friction coefficient by about one order of magnitude compared to the sliding friction, thereby improving the torsional resistance of the piston 16 and preventing the piston 16 from vibrating circumferentially.

[0046] To reduce valve noise, especially at high flow rates, a vibration damper 5 is installed between the diagonal tie rod 6 and the splined sleeve 17. This damper 5 reduces deformation of the diagonal tie rod 6. The damper 5 is a permanent magnet-adjustable magnetorheological damper, or a viscous fluid damper, magnetorheological damper, or viscous shear damper, effectively mitigating wind tunnel vibration and noise. The number of dampers 5 installed is n, where n is any integer between 1 and 4. Each damper 5 is paired with the diagonal tie rod 6, with their centerlines perpendicular to each other.

[0047] In this embodiment, the ends of piston 16 are provided with a primary seal 15 and a secondary seal 11. These seals utilize pipeline gas to achieve an inflatable seal. The primary seal 15 is a T-shaped structure with an inflation port and a draft angle. High-pressure gas is used to enhance sealing and prevent leakage. The secondary seal 11 is a U-shaped structure that utilizes pipeline gas for inflatable sealing. Multiple primary and secondary seals can be deployed to increase sealing redundancy and reliability.

[0048] like Figure 4 As shown, the secondary seal 11 is a U-shaped structure, and the primary seal 15 is a beveled T-shaped structure with an inflation port. High-pressure gas passes through the inflation port, allowing the secondary seal 11 and primary seal 15 to fit more tightly against the sealing surface, preventing overpressure leakage. In this embodiment, the secondary seal cover plate 10, primary seal pressure plate 12, first primary seal panel 13, and second primary seal panel 14 are all removable and replaceable in circumferential sections. The primary seal pressure plate 12, first primary seal panel 13, second primary seal panel 14, and primary seal 15 form a bidirectional sealing structure that can be used for rapid on / off sealing of pipelines.

[0049] The present invention avoids the vibration of the pressure regulating valve and realizes the accurate closed-loop control of the flow field pressure. The entire device is provided with necessary supports and lifting lugs for easy installation and storage.

[0050] The present invention addresses the problems of existing wind tunnel pressure regulating valves with no flow stabilization measures at the inlet and valve core support at the outlet, resulting in poor inlet airflow uniformity and large flow separation caused by support interference at the outlet. The present invention provides a sintered wire mesh air intake grille at the inlet to stabilize the flow and no support at the outlet to separate the flow, ensuring a stable flow field.

[0051] This invention uses a servo hydraulic cylinder to drive a high-torque ball spline servo drive, which axially drives a spline sleeve to drive the diagonal tie rod, ultimately driving the axial movement of the piston. Rolling friction replaces sliding friction, improving the piston's torsional resistance. The shock absorber prevents buckling of the diagonal tie rod and achieves vibration reduction. A displacement sensor provides real-time feedback on the piston's axial position. Precise regulation of flow field pressure is achieved through changes in the cross-sectional area of ​​the passageway between the piston and the pressure-regulating cone, caused by changes in the axial displacement of the piston and the pressure-regulating cone.

[0052] The piston secondary seal of the present invention is a U-shaped structure, and the main seal is a T-shaped structure with an inflatable port and an inclined surface. High-pressure gas passes through the inflatable port, making the secondary seal and the main seal fit more tightly to the sealing surface, avoiding overpressure leakage. The resulting two-way sealing structure can be used for rapid on-off sealing of pipelines.

[0053] The pressure regulating valve drive device of the present invention adopts dual servo hydraulic valves to achieve coarse and fine flow control to realize precise pressure regulation and emergency shutdown functions. Based on the double closed-loop PID servo control strategy of the valve characteristics, the outer ring is the total pressure and the inner ring is the valve position. The parabolic speed curve method is used to optimize the valve core switching car, avoiding the rapid impact damage of the valve core to the valve structure.

[0054] The present invention includes the following innovative features:

[0055] Flow stabilization measures: A multi-layer sintered metal mesh air intake grille is set at the air inlet to reduce airflow pulsation and improve the uniformity of the inlet airflow; there is no support at the outlet to avoid structural vibration caused by airflow separation.

[0056] Precise pressure regulation: A servo drive consisting of a servo hydraulic cylinder, hydraulic rod, and displacement sensor drives a splined sleeve, driving the diagonal tie rod and ultimately the piston in axial motion. The axial displacement of the piston and the pressure-regulating cone precisely adjusts the channel cross-sectional area and achieves precise regulation of flow field pressure.

[0057] Vibration reduction design: A vibration damper is designed to avoid buckling and deformation of the inclined tie rod, while reducing vibration and improving the stability of the pressure regulating valve.

[0058] Bidirectional sealing structure: It adopts a bidirectional sealing structure with U-shaped secondary seal and T-shaped main seal, and uses pipeline gas for inflation and sealing to avoid overpressure leakage and realize rapid pipeline on-off sealing.

[0059] Servo hydraulic control: The servo hydraulic valve performs coarse and fine control on the flow rate, adopts a double closed-loop PID control strategy, and optimizes the opening and closing process of the valve core through a parabolic speed curve to avoid the impact of the valve core on the valve structure and extend the service life.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A large-diameter vibration-damping annular gap type pressure regulating valve device for a sub-span super wind tunnel, characterized in that: The cam is connected to the air intake of the outer cone and the inner cone, and the air intake of the outer cone is connected to the air intake grille. The inner cone is arranged inside the outer cone, and the outer cone and the inner cone form a circulation area. The inlet of the pressure regulating profile cone is connected to the outer cone, and the outlet of the pressure regulating profile cone is connected to the outlet flange. The inner surface of the pressure regulating profile cone is a combination of an arc surface and a multi-segment index surface. A piston is provided between the inner cone and the pressure regulating profile cone, and a main seal and a secondary seal are provided at the end of the piston. The piston is slidably connected to the inner cone through a servo drive. A plurality of diagonal rods are provided between the servo drive and the piston, and the two ends of the diagonal rod are respectively hingedly connected to the servo drive and the piston, and the two ends of the shock absorber are respectively hingedly connected between the diagonal rod and the servo drive.

2. The large-diameter vibration-damping annular gap type pressure regulating valve device for a sub-span super wind tunnel according to claim 1 is characterized in that: The air intake grille is composed of multiple layers of sintered metal mesh blocks, the mesh number of the air intake grille ranges from 10 to 300 meshes, the noise reduction frequency of the noise reduction arc plates of the sintered metal mesh blocks is 0 to 40,000 Hz, and the air permeability is 30% to 100%.

3. The large-diameter vibration-damping annular gap type pressure regulating valve device for a sub-span super wind tunnel according to claim 1 is characterized in that: The servo drive device includes a servo hydraulic cylinder, a hydraulic rod, a spline shaft, a spline sleeve and a displacement sensor. The spline shaft is fixed to the inner cone through a support. The spline shaft and the spline sleeve form a high-torque ball spline. Spherical hinge seats are provided at both ends of the diagonal rod. The two spherical hinge seats are connected to the diagonal rod through self-locking trapezoidal threads, and the rotation directions of the self-locking trapezoidal threads of the spherical hinge seats at both ends are opposite. An anti-loosening device is provided between the spherical hinge seat and the diagonal rod. One end of the diagonal rod is connected to the piston through the spherical hinge seat, and the other end of the diagonal rod is hinged to the spline sleeve. The spline sleeve is driven to slide back and forth relative to the spline shaft by the hydraulic rod, and finally the diagonal rod is driven to drive the piston axially.

4. The large-diameter vibration-damping annular gap type pressure regulating valve device for a sub-span super wind tunnel according to claim 3 is characterized in that: The servo hydraulic cylinder is a double-acting servo hydraulic cylinder. The servo hydraulic cylinder adopts dual servo hydraulic valves for coarse and fine flow control to achieve precise pressure regulation and emergency shutdown functions. The servo hydraulic cylinder adopts a double closed-loop PID servo control strategy based on the valve characteristics, with the outer ring as the total pressure and the inner ring as the valve position. The parabolic speed curve method is used to optimize the valve core switching car, thereby avoiding the valve core from quickly impacting and damaging the valve structure.

5. The large-diameter vibration-damping annular gap type pressure regulating valve device for a sub-span super wind tunnel according to claim 1 is characterized in that: The outer cone is designed to have a cylinder-cone-cylinder structure, the cone angle of the outer cone is less than 30°, the outer cone is connected to the inner cone via an even number of support ribs, and the cone angle of the inner cone is less than 60°.

6. The large-diameter vibration-damping annular gap type pressure regulating valve device for a sub-span super wind tunnel according to claim 1 is characterized in that: The primary seal is a T-shaped structure with an inflation port and a draft angle, and the secondary seal is a U-shaped structure.

7. The large-diameter vibration-damping annular gap type pressure regulating valve device for a sub-span super wind tunnel according to claim 1 is characterized in that: The piston is made of cast aluminum or steel, and the outlet of the piston is evenly distributed with tiny air holes connected to the main seal.

8. The large-diameter vibration-damping annular gap type pressure regulating valve device for a sub-span super wind tunnel according to claim 1 is characterized in that: The vibration absorber adopts a permanent magnet adjustment type magnetorheological damper or a viscous fluid damper, a magnetorheological damper or a viscous shear type damper.

9. The large-diameter vibration-damping annular gap type pressure regulating valve device for a sub-span super wind tunnel according to claim 1 is characterized in that: The number of the shock absorbers is n, where n is any integer between 1 and 4. The shock absorbers are used in pairs with the diagonal tie rods, and the center lines of the shock absorbers and the diagonal tie rods are perpendicular to each other.

10. The method for using the large-diameter vibration-damping annular gap type pressure regulating valve device for a sub-span super wind tunnel according to claim 1 is characterized in that: The steps include: The two ends of the pressure regulating cone are connected to the outer cone and the outlet flange respectively, and the inner cone and the outer cone form a fluid flow area; The servo drive device axially drives the spline sleeve to drive the inclined rod and ultimately drives the piston to move axially. The displacement sensor provides real-time feedback of the axial position of the piston. The flow field pressure is precisely adjusted by the change in the channel cross-sectional area of ​​the piston and the pressure-regulating surface cone caused by the change in the axial displacement of the piston and the pressure-regulating surface cone. The air intake grille at the air inlet stabilizes the flow and reduces airflow pulsation. The flow field outlet has no support to avoid structural vibration caused by flow separation. The spline sleeve avoids circumferential vibration of the piston. The shock absorber avoids bending deformation of the inclined rod and achieves vibration reduction. The main seal and secondary seal of the piston use pipeline gas to achieve inflation sealing.

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