Monitorable shaft end sealing system and control method

Abstract

The invention provides a monitorable shaft end sealing system and a control method. The shaft end sealing system comprises a first-grade gap sealer and a second-grade contact sealer arranged in a serial connecting manner, a liquid auxiliary system and a control system; the first-grade gap sealer is a liquid film sealer; the liquid auxiliary system comprises an isolation cavity between the first-grade gap sealer and the second-grade contact sealer, and a conveying pipeline for conveying isolation liquid into the isolation cavity; and the control system comprises a first pressure adjusting device arranged on the conveying pipeline and capable of adjusting the pressure of the isolation liquid, a sensor for detecting the liquid film thickness of the first-grade gap sealer, and a main controller. Through arrangement of the first-grade gap sealer and the second-grade contact sealer in the serial connecting manner, the shaft end sealing tightness of fluid equipment is improved; and the control system is provided for guaranteeing maintenance of the liquid film thickness in a set numerical value range and guaranteeing operation of the first-grade gap sealer in an optimal working condition point always, so that safe and stable long-period operation of the shaft end sealing system is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of shaft end dynamic sealing of fluid conveying equipment, and in particular relates to a monitorable shaft end sealing system and a control method with the shaft end sealing system. Background technique [0002] Fluid conveying equipment such as pumps and compressors are widely used in petrochemical, metal smelting, papermaking and other industries. As society pays more and more attention to environmental protection, in order to realize the transportation of fluid, the fluid must have a certain pressure, and the leakage requirements for the shaft end seal of fluid transportation equipment are becoming more and more stringent. The American Society of Tribology and the Society of Lubrication Engineers have formulated some easy The guideline for the quantitative control of volatile matter emission requires the shaft end seal to develop from zero leakage to zero escape. At the same time, in order to extend the ...

AI Technical Summary

Problems solved by technology

However, liquid film seals generally can only operate stably at the design operating point. In the case of high parameters or variable operating conditions, the end film thickness may be too large, serious leakage may occur, or excessive end load may cause The severe wear of the sealing end face greatly shortens the service life of the mechanical seal; it may also cause problems such as environmental pollution, energy waste, equipment shutdown and even safety accidents, and the loss far exceeds the cost of the seal itself

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