Leak detector measuring method

Abstract

The invention relates to a leak detector measuring method. Gas is injected into a workpiece chamber. The air pressure in the workpiece chamber is measured at time T1, and the measured air pressure value is recorded as P1. The air pressure in the workpiece chamber is monitored in a period of time delta T after time T1. The air pressure in the workpiece chamber is monitored. Whether the difference between P1 and P2 is greater than delta P is judged. P2 is the air pressure measured at any time within the period of time delta T in the workpiece chamber. Delta P is a preset qualified air pressure value. If the difference between P1 and P2 is greater than delta P, a workpiece to be detected in the workpiece chamber is defective. According to the invention, by measuring the air pressure at different periods of time in the workpiece chamber, whether the workpiece is defective according to whether the difference between P1 and P2 is greater than delta P; workpieces are independently detected in the process of measurement without providing a standard workpiece chamber for the workpiece chamber; factors which influence a measurement result and are caused by standard workpieces and the standard workpiece chamber are removed; and the accuracy of the measurement result is improved.

Description

technical field [0001] The invention relates to a measuring method of a leak detector. Background technique [0002] A leak detector is an instrument that detects leaks on workpieces. For example, the Chinese invention patent application publication specification CN104303035A and the Japanese Patent Application Publication No. 2000-121486 disclose a constant flow type leak tester (i.e. a leak tester). The workpiece compartment for placing the workpiece to be tested is injected with the same constant flow of air at the same time, and then the differential pressure between the standard compartment and the workpiece compartment is detected by a differential pressure detector connected between the standard compartment and the workpiece compartment. Therefore, it is judged whether the workpiece is good or not. The detection of these existing leak detectors for each workpiece must rely on standard parts, especially the specifications of the standard parts, and the differences be...

AI Technical Summary

Problems solved by technology

The detection of these existing leak detectors for each workpiece must rely on standard parts, especially the specifications of the standard parts, and the differences between the standard parts and the workpieces in the specification parameters, and the differences in the specification parameters between the standard parts cabin and the workpiece cabin. Factors such as the difference of the test environment and the various uncertainties of the test environment will affect the measurement results, which will reduce the accuracy of the measurement results.

Even for the same type of workpiece, there will be differences between workpieces (such as differences in dimensions), which will also affect the measurement results

[0003] In addition, since standard parts must be used for each measurement, a separate standard part cabin needs to be equipped corresponding to each workpiece cabin, which will increase the manufacturing cost of the leak detector and increase the space occupied by the leak detector

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