Roots Vacuum Pumps | Products - Leybold

Roots vacuum pumps RUVAC, which are also called Roots blowers, are rotary plunger type pumps where two symmetrically shaped impellors rotate in opposite directions inside the pump housing. Roots pumps are used where great volumes have to be pumped. In combination with backing pumps, which compress against the atmosphere, these pumps are capable of improving the attainable ultimate pressure of a pump system by a factor of 10. With two Roots vacuum pump stages and a corresponding backing pump it is possible to attain pressures in the range down to 10-5 mbar (0.75•10-5 Torr). Regarding the motor concept RUVAC pumps are offered in different models.

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Roots vacuum pumps RUVAC, which are also called Roots blowers, are rotary plunger type pumps where two symmetrically shaped impellors rotate in opposite directions inside the pump housing. Roots pumps are used where great volumes have to be pumped. In combination with backing pumps, which compress against the atmosphere, these pumps are capable of improving the attainable ultimate pressure of a pump system by a factor of 10. With two Roots vacuum pump stages and a corresponding backing pump it is possible to attain pressures in the range down to 10-5 mbar (0.75•10-5 Torr). Regarding the motor concept RUVAC pumps are offered in different models.

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Based on the different technologies, we distinguish between eight types of vacuum pumps:

Oil-Lubricated Rotary Vane Vacuum Pumps
The rotary vane technology enables a technically simple structure of the vacuum pumps. The consistently high vacuum level in continuous operation is guaranteed through circulating oil lubrication, perfectly coordinated materials and state-of-the-art and precise manufacturing. The standard oil separator ensures clean and oil-free exhaust thanks to its sophisticated extractor system with integrated oil return. When fitted with an optional gas ballast valve, even large amounts of vapour can be processed. A non-return valve in the inlet flange prevents air from flowing back into the vacuum chamber when the vacuum pump is switched off.

Dry Claw Vacuum Pumps
With claw vacuum pumps, two claw-shaped rotors turn in opposite direction inside the housing. Due to the shape of these claw rotors, the air or gas is sucked in, compressed and discharged. The claw rotors do not come into contact either with each other nor with the cylinder in which they are rotating. Tight clearances between the claw rotors and the housing optimize the internal seal and guarantee a consistently high pumping speed. A synchronization gearbox ensures exact synchronization of the claw rotors.

Dry Screw Vacuum Pumps
Dry screw vacuum pumps operate with two screw rotors rotating in opposite directions. The pumping medium is trapped between the individual screw-shaped rotors, compressed and then transported to the gas discharge. During the compression process, the screw rotors do not come into contact with each other, or the cylinder. This means there is no need for lubrication or operating fluids in the compression chamber.

Vacuum Boosters
Within the housing of vacuum boosters, two lobe rotors rotate synchronously. Due to the special profile of the rotating lobes and their precise manufacturing, they do not come into contact with each other or the housing. This makes it possible to pump a medium without the need of any operating fluids. The two lobe rotors are driven by a gear pair located on the shaft ends of the gearbox and separated from the compression chamber.

Dry-Running Rotary Vane Vacuum Pumps
These vacuum pumps work in accordance to the proven rotary vane technology. Thanks to self-lubricating rotor vanes, no operating fluid is necessary. The compression takes place in a completely dry process. A consistently high vacuum level in continuous operation is guaranteed through perfectly coordinated materials, the special graphite vanes in the compression chamber, effective heat discharge and the state-of-the-art and precise manufacturing.

Liquid Ring Vacuum Pumps
Liquid ring vacuum pumps have an eccentrically mounted impeller. The liquid ring is formed by the operating fluid (usually water) rotating concentrically inside the housing. The process gas enters through the inlet, moves between the impeller blades and is compressed before being discharged through the outlet, along with a certain amount of operating fluid. Liquid ring vacuum pumps can be operated as a simple continuous flow system, or as a partial or total recirculation system.

Scroll Vacuum Pumps
Scroll vacuum pumps consist of both a fixed and an orbiting scroll. As the orbiting scroll moves, voids are created at the inlet of the pump, drawing in the gas. Through the movement of the rotor, the gas is continuously compressed until it is finally discharged.

Diffusion Vacuum Pumps
The diffusion vacuum pump construction consists of an oil boiler connected to a central multi-stage jet assembly. The heated oil is ejected from the jet assembly at supersonic speeds and the process gas molecules are entrained in the oil jet flow and transferred through the pump body by the heavier oil molecules' momentum. This process moves the gas molecules from the low pressure inlet flange to the foreline vacuum port of the diffusion pump, where the oil is condensed and returned to the boiler and the process gas molecules are removed by the backing pump.

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