The vacuum switch determines the mechanical life of the arc extinguish chamber
In the vacuum interrupter, the bellows are welded to the outside of the dynamic conductive rod and the inner port of the moving-end cover plate. When the vacuum switch is opened or closed, it is compressed or restored and acts as a seal, which determines the arc extinction. The mechanical life of the room. The choice of bellows depends on the inner and outer diameters. The inner diameter of the bellows is limited by the thickness of the conductive rod and the guide sleeve. Usually the guide sleeve tightly sleeves the movable conductive rod, and its wall thickness is only a gap between the inner diameter of the corrugated tube and the outer diameter of the guide sleeve to prevent friction. Therefore, the inner diameter of the corrugated tube is restricted by the thickness of the conductive rod, and the conductive rod The thickness of the vacuum interrupter is also limited by the size of the rated current of the vacuum interrupter. Therefore, the internal diameter of the corrugated pipe at the end is limited by the size of the rated current of the vacuum interrupter. The outer diameter of the bellows is limited by the vacuum arc-extinguishing chamber diameter and the power frequency impact withstand voltage. The corrugated pipe inner diameter and outer diameter wave thickness should be as uniform as possible with the inner diameter outer diameter and wave thickness distance given in the hall metal bellows to facilitate purchase. After the number of internal and external diameters and wave thickness are determined, the number of bellows determines the life of the bellows. If the bellows in the hall is selected, the wave thickness and wave length of the bellows can be used to determine the compression of the single wave, and then the compression percentage and pressure resistance percentage can be calculated. The predicted service life of the bellows can be obtained according to the figure. The allowable compression of the bellows and the allowable pressure resistance calculations are as follows. For the wave thickness, C is the wall thickness of the corrugated pipe, the inner diameter of the corrugated pipe, the yield limit of stainless steel, the outer diameter of the corrugated pipe, the elastic modulus of the stainless steel corrugated pipe, and the related constant, and then the corrugation The total allowable compression amount of the tube and the percentage of the compression resistance can be obtained from the map for the predicted life of the bellows. It should be pointed out that the ratio between the effective length and the diameter of the bellows must not be exceeded, otherwise the bellows may become unstable, and the design of the bellows or the vacuum interrupter must be reconsidered. Welding seams for welding bellows should be smooth and uniform, and there should be no defects such as oxidation open arc pits. The corrugated pipe nodes should be uniform in size, and the axis should be perpendicular to the plane of the corrugated pipe and should not be inclined. For sizes that are difficult to accurately test, such as wall thickness and length, it can be verified by the weighing method. Each batch of material should be sampled and tested for its composition to see if it is within the qualified range, especially the elements that are easy to evaporate. If it exceeds the standard, use a magnet to check if it is magnetic.
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