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The working principle of the slide valve vacuum pump is actually similar to the pump, when the pump structure is different from the time of the two. Sliding valve vacuum pump principle is the main use of slide valve body to change the volume of the West gas cavity, which is called Huafa pump. "Although the slide valve vacuum pump is an old pump, compared with rotary vane pumps, it has outstanding features such as high working pressure (10 4 pa), large pumping capacity, continuous operation in harsh environments and durability, So it is widely used in vacuum smelting, vacuum drying, vacuum impregnation, vacuum distillation etc. At present, oil-sealed vacuum pumps widely used in the vacuum industry are mostly medium and small selection pumps and medium and large-size slide valve type vacuum pumps. The working principle of the vane pump is that under the dirty working conditions, the vane pump is stuck in the rotor groove. Although the vane pump overcomes this shortcoming to some extent, due to the distance between the center of mass of the spool valve and the center of rotation Not a fixed value, although some structural balance measures have been taken, but the balance can not be reached yet so that the vibration can not be eliminated completely. In particular, the larger the capacity of the pump, the greater the vibration. Meanwhile, the above two pumps, Exhaust volume compared to the size appears larger.