Flow type airtight testing device

Abstract

The invention provides a flow type air tightness testing device. The flow type air tightness testing device comprises a gas input loop, an exhaust loop, an air tightness detection loop, a first measuring unit and a second measuring unit, wherein the input end of the gas input loop is used for being connected with a gas pressure source, the output end of the gas input loop is connected with the input end of the gas tightness detection loop, the output end of the gas tightness detection loop is used for being connected with a standard end and a workpiece end, the exhaust loop is connected to the gas tightness detection loop, the first measuring unit is connected on an air tightness detection loop, and the second measuring unit is connected between the standard end and the input end of the air tightness detection loop. The problem that in the prior art, a wide-range flowmeter is low in precision and cannot directly test micro leakage of a large-size workpiece is solved.

Description

technical field [0001] The invention relates to the field of air tightness testing, in particular to a flow type air tightness testing device. Background technique [0002] The gas flow meter is a detection instrument of the automatic control system, an instrument that indicates the measured flow rate or the total amount of fluid within a selected time interval. The flow meter detection method adopts the method of instantaneous loss of flow to carry out the tightness test of the product under test. The main principle is to use sensors to directly detect the leakage rate of the product and display it in real time. The high-precision mass flowmeter adopts heat-sensitive measurement. The gas presents a stable molecular flow through the capillary, and the molecular mass taken away by the split molecules is calculated to measure the flow rate. [0003] At present, the flow test method used in the air tightness test is to directly detect the leakage rate of the product, and the ...

AI Technical Summary

Problems solved by technology

[0003] At present, the flow test method used in the air tightness test is to directly detect the leakage rate of the product, and the accuracy of the large-scale flowmeter is low, which cannot meet the direct test of the microleakage of the large-volume workpiece

Due to the limited capillary flow, the high-precision mass flowmeter cannot meet the requirements of rapid inflation and deflation in the airtight test of large-volume workpieces, and the test efficiency is low.

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