Wind tunnel diaphragm clamping device

Abstract

The invention discloses a wind tunnel diaphragm clamping device. The clamping device comprises an upstream pipe section, a film clamping ring and a downstream pipe section which are arranged in sequence, the upstream pipe section is a moving section, and the downstream pipe section is a fixed section. The device further includes an upstream end fixing flange sleeving the upstream pipe section, anda downstream end fixing flange, a hydraulic cylinder ring base, a movable squeezing block and a pressing block that sequentially sleeve the downstream pipe section; pull rods evenly distributed in the circumferential direction sequentially penetrate through the upstream end fixing flange, the downstream end fixing flange, the hydraulic cylinder ring base, the movable squeezing block and the pressing block, the front ends of the pull rods are fixed to the front end face of the upstream end fixing flange through nuts, and the rear ends of the pull rods are fixed to the rear end face of the pressing block through nuts. The clamping device is simple and reliable in structure, convenient to use and maintain, safe and stable in operation and suitable for being popularized and applied to construction of large 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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