Gas sealing experimental device and method

Abstract

The invention discloses a gas sealing experimental device which comprises a sealed cavity, a driving system, a gas supply loop and a test system. The gas sealing experimental device is characterized in that the sealed cavity is vertically fixed on a bracket by a bolt; the driving system comprises a motor, a coupler, a bearing box and a spindle; the motor is fixed on the bracket by the bolt; the motor and the spindle are connected by the coupler; the gas supply loop comprises a compressor, a pneumatic pipe and a pressure regulation valve; the compressor is connected with a gas inlet of the sealed cavity through the pneumatic pipe; and the test system comprises an eddy current sensor, a moving ring positioning sheet, a flowmeter and a pressure sensor. Through adoption of the gas sealing experimental device, the sealed end surface gas leakage rate and the gas film thickness of various gas end surfaces can be measured on line. The measurement method of gas leakage rate is simple and easy to implement and has good dynamic response, the measurement of gas film thickness is not affected by the material of a seal ring, end surface width and the annular surface waviness of the seal ring, and revolving speed and pressure in the experiment process are adjustable.

Description

technical field [0001] The invention relates to the technical field of gas end face mechanical sealing experiments, in particular to a sealing experimental device and method for detecting the end face gas leakage rate and gas film thickness of various gas end face seals. Background technique [0002] Mechanical seals are the main means to prevent the shaft end leakage of rotary fluid machinery. Among them, dry gas end face seals are widely used in petrochemical, natural gas and other industries due to their outstanding advantages such as low power consumption, long working life, small leakage or even zero leakage. More and more widely, it is the preferred form of shaft end seal for rotary fluid machinery such as large compressors and special medium pumps, and it is also more and more widely used in reactors. [0003] With the wide application of dry gas seals, it is particularly important to form a unified optimal design criterion for dry gas seals. The blind area of ​​desi...

AI Technical Summary

Problems solved by technology

Since the object of the eddy current sensor must be a metal conductor, this greatly limits the measurement of the gas film thickness of the sealing end face of non-metallic materials. At the same time, the area of ​​the measured surface should be greater than 1.83 times the diameter of the eddy current sensor. When the sealing ring is narrow Its use is also restricted

At present, the common installation method of eddy current sensor is to drill a hole on the static ring, and install the eddy current sensor in the hole. If the hole is drilled, it will affect the working state of the end face. If the hole is blind, the distance between the eddy current sensor and the end face of the moving ring will be affected. The sealing ring material will greatly affect the sensitivity of the sensor

In addition, because there is a certain circumferential waviness on the sealing surface, this installation method will cause the measurement results to include circumferential waviness. The thickness of the gas film on the end surface is on the order of microns and the surface roughness is the same order of magnitude, and the surface waviness is greater than the roughness. Therefore, the measurement results There is a large error

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