A wind tunnel diaphragm clamping device

Abstract

The invention discloses a wind tunnel diaphragm clamping device. The clamping device includes an upstream pipe section, a sandwich ring and a downstream pipe section arranged in sequence, the upstream pipe section is a moving section, and the downstream pipe section is a fixed section; it also includes an upstream end fixed flange set on the upstream pipe section, which is sequentially set on the downstream pipe section The downstream end fixed flange, the hydraulic cylinder ring seat, the movable extrusion block and the pressing block; the tie rods evenly distributed along the circumferential direction pass through the upstream end fixed flange, the downstream end fixed flange, and the hydraulic cylinder ring seat 1. Movable extrusion block and briquetting block, the front end of the pull rod is fixed on the front end face of the upstream end fixed flange through a nut, and the rear end of the pull rod is fixed on the rear end face of the briquetting block through a nut. The clamping device has simple and reliable structure, convenient use and maintenance, safe and stable operation, and is suitable for popularization and application in the construction of large-scale high-enthalpy pulse equipment.

Description

technical field [0001] The invention belongs to the field of high-enthalpy pulse equipment, and in particular relates to a wind tunnel diaphragm clamping device. Background technique [0002] In high-enthalpy pulse equipment such as shock wave wind tunnels and expansion tube wind tunnels, diaphragms are used to separate different sections of the high-enthalpy pulse equipment. Clamped to meet test requirements. [0003] At present, commonly used clamping mechanisms include hydraulic clamping mechanisms, full-thread clamping mechanisms, and cut-off thread clamping mechanisms. [0004] The hydraulic clamping mechanism uses a part of the shock wave pipe section as the piston in the hydraulic cylinder, and realizes the clamping and loosening of the diaphragm by adjusting the pressure difference of the hydraulic oil at both ends of the piston. The advantage of the hydraulic clamping mechanism is that the device is simple and the diaphragm clamps The tightening force is large; th...

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Problems solved by technology

[0004] The hydraulic clamping mechanism uses a part of the shock wave pipe section as the piston in the hydraulic cylinder, and realizes the clamping and loosening of the diaphragm by adjusting the pressure difference of the hydraulic oil at both ends of the piston. The advantage of the hydraulic clamping mechanism is that the device is simple and the diaphragm clamps The tightening force is large; the disadvantage is that the size of the large hydraulic clamping mechanism is large, and it is inconvenient to manufacture and use, which limits the application of the hydraulic clamping mechanism in large shock wave wind tunnels

[0005] It is technically feasible to insist on using a large-scale hydraulic clamping mechanism on large-scale high-enthalpy pulse equipment. However, due to the large size of the large-scale hydraulic clamping mechanism and the large sealing area, once the large-area seal is partially worn, it will cause The seal fails as a whole, and the seal failure will bring a series of difficult problems: first, the seal ring must be replaced after the seal failure occurs, and it is very difficult to replace the seal ring on a large hydraulic clamping mechanism

Secondly, the failure of the seal will also lead to oil leakage and environmental pollution, and it is very difficult to clean up the site

Thirdly, after the seal fails, because the pressure difference between the two ends of the piston in the hydraulic cylinder is not enough, the film clamping force is not enough, and the diaphragm is not clamped tightly, which will bring great safety hazards to the operation of equipment using hydrogen as the driving gas

Therefore, once the seal fails, it will take a long time to repair it, which will inevitably cause the large-scale high-enthalpy pulse equipment to fail to operate for a long time, and seriously reduce the test efficiency of the large-scale high-enthalpy pulse equipment

[0006] The full-thread clamping mechanism and the cut-off thread clamping mechanism have the advantages of compact structure, high connection strength and rigidity, but due to the use of thread connection, transmission and loading, the use and operation of large-scale thread clamping mechanisms are very inconvenient, and replacement If the diaphragm time is too long, it will also reduce the test efficiency of large high-enthalpy pulse equipment

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