System and method for measuring low-temperature sealing specific pressure performance parameters of sealing material

Abstract

The invention discloses a system and a method for measuring the low-temperature sealing specific pressure performance parameters of the sealing material. The system for measuring the low-temperature sealing specific pressure consists of a sealing specific pressure testing device, a liquid nitrogen tank, a mounting bracket, a control module, a pipeline, a gas supply and leak detection device and the like. Through controlling the pressure of the gas source and detecting the pressure of the gas leakage, the minimum compressive stress or the specific pressure y of the sealing gasket material, and the gasket factor m of the sealing gasket material in low-temperature working conditions can be calculated in combination with the structure parameters of a piston., a valve stem, a sealing part, a sealing gasket and other parts. Meanwhile, sealing gaskets of different specifications are replaced during the testing process, so that the sealing specific pressure performance parameters of the sealing gaskets of different specifications in the low-temperature state can be determined. According to the technical scheme of the invention, the liquid-nitrogen environment at a temperature of -196 DEG C is adopted as the testing environment for testing the low-temperature sealing specific pressure performance parameters of the sealing material. In this way, the real working condition for the sealing state of a sealing gasket in a low-temperature medium pipeline can be really reproduced. The system and the method provide a reference for the parameter selection of the sealing part in the low-temperature medium pipeline, and are better in pertinence and objectivity.

Description

technical field [0001] The invention relates to a system and method for measuring low-temperature sealing specific pressure performance parameters of sealing materials. The safety and reliability of the injection pipeline can also be extended to other low-temperature medium delivery pipeline systems. Background technique [0002] Flange bolt connection is an important connection method for low temperature equipment or components in low temperature filling system. Due to the low temperature characteristics of liquid hydrogen, liquid oxygen, liquid nitrogen and other media, it is necessary to ensure that there is no leakage of low temperature medium during the filling process of low temperature medium. In order to ensure the reliable sealing of the flange at room temperature and low temperature, it is necessary to apply a certain pre-tightening force to the bolts to ensure that the gasket meets the requirements of the sealing specific pressure under various working conditions....

AI Technical Summary

Problems solved by technology

However, due to the shrinkage of the relevant parts of the cryogenic flange at low temperatures, and the different temperature changes of the parts, different sizes, and different materials, the degree of shrinkage of the parts is inconsistent, and the sealing specific pressure of the sealing material at low temperatures will increase. , For F4 materials, there is still a cold flow problem, so how to determine the flange tightening torque value at low temperature is a difficult problem and a basic problem that needs to be solved

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