An Eccentric Adjusting Vibration Damping Device for Non-contact Sealing

Abstract

The invention discloses an eccentricity adjusting and vibration damping device for non-contact sealing, and belongs to the technical field of vibration control. The eccentricity adjusting and vibration damping device for non-contact sealing is mainly used for reducing or weakening rotor eccentricity and restraining fluid shock excitation by adjusting the radial position of a sealing stator. The eccentricity adjusting and vibration damping device comprises a signal monitoring and analyzing system and an execution system. The real-time signal monitoring and analyzing system is composed of an eddy current displacement sensor, a pressure sensor, a wiring terminal, a signal conditioning module, a data acquisition card and a computer. The execution system is composed of a driver, a stepping motor, a lead screw, a sliding block and the sealing stator in rigid connection with the sliding block. Compared with the prior art, the eccentricity adjusting and vibration damping device for non-contact sealing is novel in structure, eccentricity adjustment can be carried out on the sealing structure for the purpose of reducing or eliminating rotor eccentricity, the problem of fluid shock excitation caused by uneven circumferential pressure of the sealing gap is solved, adjustment can be carried out flexibly according to the eccentricity degree of a rotor and the vibration situation of a rotary shaft, the whole process is continuous, closed and controllable, operation is simple and direct, and the vibration damping effect is excellent.

Description

technical field [0001] The invention relates to an eccentric adjustment damping device for non-contact sealing of rotating fluid machines, mainly used for controlling the excitation of sealing fluids in rotating machines such as steam turbines, gas turbines, water turbines and blowers, and belongs to the technical field of vibration control. Background technique [0002] Steam turbines, gas turbines, water turbines, blowers and other turbomachinery are the core equipment in aviation, electric power and petrochemical industries. With the rapid development of industry, turbomachinery is gradually becoming large-scale, high-speed, high-load, etc. to meet various complex working conditions The demand direction is developing, and these development trends have also put forward higher requirements for the safe, efficient and reliable operation of turbomachinery. Due to the continuous reduction of large turbine mechanical seal gaps and the continuous increase of parameters such as s...

AI Technical Summary

Problems solved by technology

However, both injection and suction have the disadvantages of increasing effective medium loss and waste of power energy.

The mechanism of synthetic jet technology is to install a synthetic jet actuator on the shell of the flowing medium, use the vibration of the vibrating membrane to change the pressure of the cavity, drive the fluid in the main field to enter and exit the hole or slit, and generate vortex pairs or vortex rings entering the flow field to generate It belongs to disturbance control and does not involve the input or output of fluid quality; Luo Zhenbing of the National University of Defense Technology elaborated the mechanism of this technology in his master thesis "Synthetic Jet Flow Mechanism and Application Research", but it calculates Complex, the application in the vibration control of sealing fluid is still in the stage of potential development

[0006] In general, the essence of existing methods is to suppress vibration by reducing the circumferential whirl of the fluid, but it cannot solve the problem of eccentricity of the rotor, so the uneven circumferential pressure caused by eccentricity still exists

[0007] Combined with the existing method of controlling the vibration of the sealing fluid that cannot directly solve the problem of eccentricity, the present invention adopts an eccentricity adjustment damping device for non-contact sealing, which can adjust the radial position of the sealing stator in real time according to the eccentricity, so that the circumferential pressure evenly distributed

Images