How the spool valve vacuum pump works
The pumping principle of the spool type vacuum pump is similar to that of the sheet pump when the pump structure is different.
The spool type vacuum pump mainly uses the spool mechanism to change the volume of the west air chamber, and thus is called a Huafa pump. Although the spool type vacuum pump is an old pump, compared with the rotary vane pump, it has the outstanding features of allowing high working pressure (10 4 pa), large pumping capacity, continuous operation in harsh environments, and durability. Therefore, it has been widely used in vacuum smelting, vacuum drying, vacuum impregnation, vacuum distillation and other industries.
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 spool type vacuum pumps. Rotary vane pump In the dirty working conditions, the rotary vane pump is stuck in the rotor groove. Although the spool type vacuum pump overcomes this disadvantage to a certain extent, since the distance between the center of mass of the spool and the center of rotation is not constant, although some balance measures are taken in the structure, the balance cannot be achieved, so the vibration is difficult to complete. eliminate. 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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