Common leakage detection of high temperature vacuum brazing furnace
Use vacuum mud to seal the suspicious leakage point. At this time, pay attention to observe the change of vacuum degree. If the vacuum degree rises quickly after sticking vacuum mud and drops obviously after removing it, it means that it is a leakage point. However, this method is rarely used in practical detection.
In high temperature vacuum brazing furnace, the leak detection method is an indispensable skill in the field of vacuum leak detection. It is widely used in vacuum leak detection because of its high leak detection efficiency, simple operation, flexible instrument response, high precision, and not easy to be interfered by other gases. Helium mass spectrometer leak detector is an air tightness detection instrument based on the principle of mass spectrometry
The mass spectrometer chamber is composed of analyzer, ion source, analyzer, cold cathode ionization gauge and collector. The electrons emitted by the filament in the mass spectrometer chamber vibrate back and forth in the chamber and collide with the gas in the chamber and the helium entering the chamber through the leak hole to form positive ions. These helium ions enter the magnetic field under the effect of accelerating electric field, Under the effect of Lorentz force, different ions can reach the receiving electrode through magnetic field and receiving slit by changing the accelerating voltage. Among them, helium injection method and helium absorption method are the two most commonly used methods for helium mass spectrometry leak detection
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