Why does a two-stage vacuum oil filter use roots pump

For most of the vacuum oil filter, only the vacuum pump, the so-called front pump. Because the ordinary oil filter on the vacuum degree and the vacuum pumping speed requirements are not big. But for the vacuum oil filter which deals with transformer oil, he is pursuing a high pumping speed and high ultimate vacuum degree. Ordinary vacuum pump commonly used in the general pumping volume is relatively large is 200 cubic meters per hour, so if the pursuit of high pumping speed, only by the vacuum pump is not up to the requirements. Roots vacuum pump is good to make up for the shortage of vacuum pump. Roots pump is a vacuum pump without internal compression, usually the compression ratio is very low, so high, medium vacuum pumps need the front stage pump. By a pair of blade-shaped rotor in the pump chamber synchronous, reverse rotation of the pressure to move the gas to achieve the vacuum pump suction. Roots vacuum pump is a mechanical vacuum pump with a pair of sole-shaped rotors rotating at high speed synchronously. This pump cannot be pumped separately. The front stage needs oil seal and water ring to exhaust the atmosphere directly.

The ultimate vacuum of Roots pump depends not only on the structure and manufacturing precision of the pump, but also on the ultimate vacuum of the front stage pump. In order to improve the ultimate vacuum of the pump, roots pump can be used in series.

ZYD, ZJA series two-stage high vacuum oil filter, with high pumping speed, high ultimate vacuum degree, can handle high grade transformer oil well.