A vibration isolation sealing device

Abstract

The invention belongs to the technical field of large-scale free jet test equipment connection and vibration suppression, and discloses a vibration isolation sealing device, which includes a moving sleeve and a support assembly, one end of the moving sleeve is fixedly installed on the nozzle pipe through a connecting bolt, and the other One end is axially slidably connected to the support assembly, an inflatable sealing shroud is installed between the moving sleeve and the nozzle contact surface, and the support assembly is fixedly installed in the test cabin; the invention has reasonable design and ingenious structure, and can realize large-scale The axial displacement gap compensation in the free jet test equipment adopts a strong moving sleeve support structure to avoid the problem of exciting vibration when the air flow is disturbed due to a sudden change in stiffness. At the same time, the structure is ingenious and easy to install and maintain.

Description

technical field [0001] The invention relates to a vibration isolation sealing device used between sections of large-scale free jet test equipment, and belongs to the technical field of test equipment connection and vibration suppression, in particular to a vibration isolation sealing device, which is used for simulation tests such as air intake passages of aircraft. Background technique [0002] In the free-jet environment test, the outlet of the nozzle is the test nozzle, and the nozzle needs to be inserted into the test chamber, which makes it difficult to seal the nozzle and the test chamber; at the same time, when the nozzle is running, especially at high Mach number In this state, the axial load is very large, and axial deformation will inevitably occur. It is very difficult to bear the axial load only by improving the strength and stiffness of the section; in addition, the working environment of the nozzle outlet is relatively harsh, and the airflow disturbance will cau...

AI Technical Summary

Problems solved by technology

One end of the axial sleeve is connected to the nozzle pipe through an end flange and a sealing strip, the other end of the axial sleeve is also provided with a connecting flange, and the connecting surface of the flange is coplanar with the connecting surface of the test chamber, through the connecting flanges at both ends of the spring plate and sealing strips to realize the connection and sealing between the sections. A semi-circular cross-section spring plate is set at the radial dimension difference between the two sections, and the elasticity of the spring plate is used to compensate the axial displacement. However, for large-diameter channels, especially square-section channels On the one hand, fillet transition is needed to solve the problem of discontinuous stiffness. On the other hand, the elastic performance of the spring plate is greatly affected by the assembly, the amount of expansion and contraction is limited, and it is prone to fatigue damage. It is inconvenient to install and maintain. Problems similar to metal bellows compensators that easily excite vibrations when airflow is disturbed

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