Roots vacuum pump pumping capacity

Roots vacuum pump starts quickly, consumes less power, costs less operation and maintenance, is insensitive to a small amount of water vapor and dust contained in the pumped gas, has a larger pumping rate, and can quickly eliminate the sudden release of gas. It is often connected in series between a diffusion pump and an oil-sealed mechanical vacuum pump to increase the pumping capacity in the middle pressure range. It is widely used in vacuum metallurgy, such as smelting, degassing, rolling, vacuum distillation, vacuum concentration and vacuum drying in chemical, food and pharmaceutical industries.large-vacuum-pump-and-small-vacuum-pump

But in the process of using Roots Vacuum Pump, we may have the phenomenon of lower pumping capacity. What is the reason?rotary-vane-vacuum-pump-in-vacuum-plastic-molding.

There are many reasons to reduce the pumping capacity of Roots vacuum pump, such as less than the rated speed, too large end clearance, leakage of filler box, insufficient water supply, heating of liquid ring, too large radial clearance of single-acting pump and scale, etc. Excessive end clearance is a common cause of insufficient air volume. If the position of the impeller on the pump body is not inclined, that is to say, the excessive end clearance is not caused by the scratch between the impeller and the side cover, then too many gaskets should be removed.
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