What is the purpose of leak detection in vacuum atmosphere furnace

Vacuum atmosphere furnaces are commonly used in various atmospheres such as vacuum, hydrogen, oxygen, nitrogen, and inert gases (such as argon). Let us understand the leak detection items of the vacuum atmosphere furnace.

The airtightness of the vacuum system in the vacuum atmosphere furnace is to prevent the performance of gas leakage, including the leakage of the leak hole (or gap) and the leakage of the material, and its quality is usually expressed by the leakage rate. Leakage rate is the amount of gas flowing through the leak (including the gap) per unit time. In the international standard, the leak rate is defined as: the inlet pressure of the leak hole is 1*0.1*105Pa, the outlet pressure is lower than 1.33*103Pa, and the temperature is 23℃±7℃. Under the standard conditions, the dew point temperature is lower than -25℃. , The amount of gas flowing through the leak per unit time.

The purpose of vacuum leak detection is not only to determine whether the system is leaking, and to quantitatively detect the size of the leak rate, but more importantly, to find the location of the leak or the cause of the leak, so that measures can be taken to repair it. The basic principle is to use the pressure difference between the inside and outside of the vacuum system of the vacuum atmosphere furnace to make the gas flow and use certain technical means to detect the location of the leak.

The vacuum system of the vacuum atmosphere furnace is filled with gas above atmospheric pressure, and the method of making the gas flow from the inside to the outside for leak detection is called the positive pressure leak detection method. The leak detection instrument probe detects the leaking gas from the outside to determine the leak. Hole location and leak rate. The vacuum system is evacuated, and the leaking gas is sprayed from the outside to the system with a nozzle to make the gas flow from the outside to the inside. Observe the changes in the reading of the leak detector to determine the location of the leak and the leak rate. This kind of leak detection is called negative pressure Leak detection method can also be called vacuum leak detection method.