Mechanical seal liquid film pressure monitoring device

Abstract

The invention discloses a mechanical seal liquid film pressure intensity monitoring device, which comprises: a monochromatic collimation light source capable of emitting monochromatic parallel light;a polarizer which is used for forming the monochromatic parallel light emitted by the monochromatic collimation light source into polarized light; a first 1 / 4 wave plate which is used for allowing thepolarized light to pass through and forming first circularly polarized light; a second 1 / 4 wave plate which is used for eliminating the phase difference caused by the first 1 / 4 wave plate in the birefringent light and forming second circularly polarized light; the analyzer is used for changing the propagation direction of the second circularly polarized light to form a photoelastic bar chart; anda stereoscopic microscope which is used for amplifying the photoelastic bar chart. According to the invention, the online monitoring and measurement of the liquid film pressure can be realized in real time, the photoelastic fringe pattern can reflect the one-way pressure stress distribution and the liquid film pressure distribution of the moving ring sealing surface, and when the mechanical sealoperates abnormally, the light fringe pattern can fluctuate abnormally, so that the occurrence of sealing failure accidents is effectively monitored and prevented.

Description

technical field [0001] The invention belongs to the technical field of pressure detection, and in particular relates to a mechanical seal liquid film pressure monitoring device. Background technique [0002] As a typical non-contact mechanical seal, liquid film seal is widely used in rotating equipment with extreme working conditions such as high speed, high temperature and heavy load, such as petroleum refining and chemical equipment, nuclear main pump, shield machine and aero engine. The dynamic pressure effect is generated by the micro dynamic pressure groove opened on the contact end surface, forming a stable and continuous liquid film on the end surface, realizing the non-contact state of the friction pair, the upstream pumping effect of the liquid film can achieve the sealing effect of zero leakage of the sealing medium, and the liquid film The existence of it will greatly reduce the friction, wear and deformation of the contact surface, effectively improve the service...

AI Technical Summary

Problems solved by technology

[0003] According to the actual operation of mechanical seal data analysis, seal failure accidents are sudden and unpredictable, and the development of seal failure is extremely rapid. Once it occurs, accidents such as production shutdown and environmental pollution will cause major economic losses.

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