Air tightness test closed system for electromagnetic valve

Abstract

The invention relates to the technical field of air tightness test equipment for electromagnetic valves, in particular to an air tightness test closed system for an electromagnetic valve. The air tightness test closed system comprises a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve as well as a pressure regulating system and an air reservoir which are arranged between an air source and a tested electromagnetic valve; the pressure regulating system comprises a proportional pressure regulating valve; an air inlet of the proportional pressure regulating valve is communicated with the air source; an air outlet of the proportional pressure regulating valve is communicated with an air inlet of the tested electromagnetic valve through the first electromagnetic valve and the air reservoir; a work port of the tested electromagnetic valve is communicated with the second electromagnetic valve and the third electromagnetic valve in sequence; the air tightness test closed system further comprises a fourth electromagnetic valve; an air inlet of the fourth electromagnetic valve is communicated with an air outlet of the proportional pressure regulatingvalve; and an air outlet of the fourth electromagnetic valve is communicated with an air inlet of the third electromagnetic valve. According to the air tightness test closed system disclosed by the invention, the sealing performance of the closed system is improved, and an airtight test result is enabled to be accurate and reliable.

Description

technical field [0001] The invention relates to the technical field of airtightness testing equipment for solenoid valves, in particular to a closed system for airtightness testing of electromagnetic valves using a pressure drop method, in particular to airtightness testing for micro-leakage. Background technique [0002] When using the pressure drop method to test the sealing performance of solenoid valves and other components, it is necessary to establish a closed system, and the test piece is connected to the system, and the sealing performance of the test piece is calculated by detecting the pressure change before and after the test period of the closed system. The usual sealing performance system is to directly set a valve between the air source and the closed system. When the valve is closed, the closed system is considered to be established. There are two problems in this method: 1. Whether the air source is completely isolated from the closed system cannot be verified...

AI Technical Summary

Problems solved by technology

The usual sealing performance system is to directly set a valve between the air source and the closed system. When the valve is closed, the closed system is considered to be established. There are two problems in this method: 1. Whether the air source is completely isolated from the closed system cannot be verified. Due to The leakage of the valve makes the gas source continuously replenish gas to the closed system; 2. The closed system and the outside world (atmosphere) are also separated by a valve for exhaust after the test. Pressure, the valve also has a leak indicator, the closed system will leak out through the valve

Images