Method for measuring pressure reliving rate of pressure reducing valve and detection method of pressure reducing valve

Abstract

The invention provides a method for measuring pressure relieving rate of a pressure reducing valve and a detection method of the pressure reducing valve. The detection method comprises the following steps: A, gradually increasing gas pressure in an inlet pipe of the pressure reducing pipe, and simultaneously collecting a plurality of gas pressure values in the inlet pipe and gas flow values of the corresponding outlet pipe of the pressure reducing valve; B, obtaining a curvilinear equation of gas pressure and gas flow, namely V=f (P) in accordance with a plurality of gas pressure values in the inlet pipe and the gas flow values of the outlet pipe collected in the step A; and C, solving a differential coefficient on the curvilinear equation (V=f (P) ) of gas pressure and gas flow so as to obtain the pressure relieving rate of the pressure reducing valve. The measurement method can accurately measure the pressure relieving rate of the pressure reducing valve and exactly and completely evaluate safety of the pressure reducing valve.

Description

technical field [0001] The invention relates to a method for measuring the pressure relief rate of a pressure relief valve and a detection method for the pressure relief valve. Background technique [0002] With the improvement of people's living standards, automobiles have become an indispensable and important means of transportation in life. At the same time, people have put forward higher requirements for the safety of automobile driving. Therefore, it is necessary for automobile manufacturers to continuously improve or strengthen the quality inspection of auto parts that may have potential safety hazards, so as to improve the safety of auto parts, and then improve the safety of the whole vehicle. [0003] For example, in an automobile cooling system, the pressure relief valve on the pressure cover of the expansion tank is a component that may pose a safety hazard. The pressure relief valve is installed at the water inlet of the expansion tank to adjust the internal press...

AI Technical Summary

Problems solved by technology

Specifically, when the heat dissipated by the engine per unit time is large, although the pressure relief valve has been opened when the pressure reaches the opening pressure value, if the pressure relief rate of the pressure relief valve cannot meet the design requirements, it will lead to a drop in the internal pressure of the expansion tank. The speed of increase is greater than the speed of pressure drop, resulting in leakage of coolant, or even bursting of the expansion tank, which affects the safety of the car

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