"The pumping principle of the spool type vacuum pump is similar to that of the sheet pump. When the structure of the two is different, the spool type vacuum pump uses the spool mechanism to change the volume of the west air chamber, so it is called Huafa pump." Huafa pump is an old one. Pump, but compared with the rotary vane pump, it has the characteristics of high working pressure (104pa), large pumping capacity, continuous operation in harsh environments, durability, etc., so vacuum smelting, vacuum drying, vacuum impregnation, vacuum Industries such as distillation are widely used. At present, most of the oil-sealed vacuum pumps widely used in the vacuum industry are medium and small size selection pumps and medium and large Huafa pumps. Rotary vane pump In the dirty working conditions, the rotary vane pump is stuck in the rotor groove. Although Huafa Pump has overcome this disadvantage to a certain extent, the distance between the center of mass of the spool and the center of rotation is not fixed. Although some balance measures have been taken in the structure, it is not yet able to achieve complete balance, so the vibration is difficult to complete. In particular, the larger the capacity of the pump, the greater the vibration. At the same time, the above two pumps, especially the spool pump, have a larger outer shape than the displacement thereof.
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