Roots high vacuum booster is that the rotors of two peanut’s shade in a casing are rotating to the opposite direction each other in a same cycle by timing gear which is being fixed on shaft. The air which suck into a suction line is captured in the space between casing and rotor and it is discharged to the atmospheric area by a first vacuum pump.
Because the rotors and the rotor and casing are rotating in keeping a very small clearance(0.2 ~ 0.6mm), there is possible a clean vacuum. Exhaust which no need lubricant oil inside of cylinder(casing) and rotor. Also, though the rotor is rotating in a high speed(Max. 3600), the semi-permanent using of rotor is possible due there is no contact with between rotor and casing. Especially the material of rotor is FCD450 of high strength and high purity and the surface treatment is done to improve the anticorrosion and strength. No using mechanical seal is allow to use it for a long time in a chemical process without a pollution of bearing.