In order to adapt to the detection of sealed components without inflation port, a leak detector specially for sealed components is designed. The leak detector adds the function of detecting large leakage by constant volume tank on the basis of detecting minor leakage by differential pressure, which effectively prevents the possibility of misjudgment of large leakage of sealed components
Firstly, the workpiece to be measured is placed in the copied sealed cavity, then air with specified pressure is filled into the constant volume tank through the instrument, and then the pressure is released into the sealed cavity through the constant volume tank. It can be judged whether there is large leakage in the sealed components by the magnitude of the pressure. After the completion of the large leakage detection, the differential pressure sensor is used as the pressure sensing element to test the existence of micro leakage.