Prediction method of leakage rate of contact mechanical seal

Abstract

The invention relates to a prediction technology of a leakage rate of an existing contact mechanical seal. By utilizing a seal interface topography evolvement rule in the wear process of a movable ring and a stationary ring, and a contact compression stress variation rule of primary and secondary seal interfaces due to the wear-down of the movable ring and the stationary ring and the stress relaxation of an O-shaped ring, the topography parameters of the seal interfaces and loads on the movable ring and the stationary ring seal interfaces, the O-shaped ring and the internal diameter and external diameter contact interfaces of the O-shaped ring are determined after the mechanical seal runs for a certain time, and the characteristic sizes of percolation channels between the movable ring and the stationary ring seal interfaces and the O-shaped ring and the internal diameter and external diameter contact interfaces of the O-shaped ring are obtained by a percolation theory, a contact mechanics theory and a fractal theory at the moment, the effect of surface tension and centrifugal force of the sealed medium is considered, and then the leakage state of the existing contact mechanical seal is predicated by a Navier-Stokes equation. The method is simple and practical, the accident problems caused by frequent replacement or expiration of the mechanical seal can be effectively solved, and the safety and reliability of equipment are improved.

Description

Technical field [0001] The invention belongs to the technical field of mechanical seal safety, and particularly relates to a technology for judging the leakage state of an in-service contact mechanical seal including a primary seal on the dynamic and static ring end faces and an O-ring secondary seal, and improves the safety and reliability of equipment. Background technique [0002] The invention of mechanical seal provides a very effective means for solving the sealing problem of the power input shaft of fluid machinery in the process industry. Because of its simple contact surface structure, convenient manufacturing, stable sealing performance, no adjustment during operation, low power loss, no wear on the shaft or sleeve surface, strong vibration resistance, and high sealing parameters, mechanical seals are widely used in electric power, Shipbuilding, aerospace, petrochemical and other process industry equipment. [0003] The connection state of the mechanical seal in the equi...

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Problems solved by technology

[0006] The present invention aims to solve the problems of frequent replacement or backlog of spare parts or massive leakage of mechanical seals used in long-period operating equipment in the field of process industry due to actual working parameters deviating from the design working conditions, resulting in changes in the leakage state, and endangering the safety of equipment production. A method for predicting the leakage rate of contacting mechanical seals

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