Lobed Rotor Vacuum Pumps and Vacuum Generators
Last Updated: April 1, 2025
Description
Lobed rotor vacuum pumps, also known as Roots pumps, are designed to move large volumes of gas through the pump. They achieve this by using two counter-rotating lobes that move synchronously without touching each other. This design allows for continuous gas movement through the pump, making them highly effective in handling substantial quantities of gas at specific pressure ranges.
Working Principle
Lobed rotor vacuum pumps operate based on the Roots principle. Two rotary lobes are mounted in parallel within the housing, and their rotor shafts are connected to synchronous gears. As the tri-lobe rotors rotate in opposite directions, they create an air pocket that travels around the housing to the discharge port. The lobes do not come into contact with each other or the housing, which minimizes wear and tear. This design is particularly useful for applications requiring high throughput and efficiency in moving gases at pressures between 0.01–10 Torr .
Applications
Lobed rotor vacuum pumps are favored in high throughput process applications. Specific examples include diffusion bonding, distillation towers, and integrated circuit (IC) fabrication lines. These pumps are also used in pneumatic suction conveying systems, where they are valued for their ability to handle high volume flows at low differential pressures .
Advantages over other Vacuum Pumps and Vacuum Generators
Lobed rotor vacuum pumps offer several advantages over other types of vacuum pumps. They are excellent for moving large quantities of gas efficiently at specific pressure ranges, which is beneficial in high throughput applications. Additionally, their non-contact operation reduces friction and wear, leading to lower maintenance requirements and increased durability .
Limitations
One of the primary limitations of lobed rotor vacuum pumps is their relatively low differential pressure capability, which restricts their use to applications requiring high volume flows at low differential pressures. This limitation makes them less suitable for applications that require higher pressure differentials .
Considerations
When considering lobed rotor vacuum pumps, it is important to evaluate the initial costs, which can be higher due to their specialized design. However, their non-contact operation can lead to lower operating expenses and maintenance costs over time, as there is minimal wear and tear. Durability is a strong point due to the lack of contact between moving parts, but accuracy in maintaining specific pressure levels should be assessed based on the application's requirements. Replacement and maintenance costs are generally lower compared to other vacuum pumps, given their robust design and reduced need for frequent servicing .
from Aerzen USA Corp.
The conveying room is protected by combined oil slinger-piston ring labyrinth sealings. The integrated canned motor ensures the sealing of the drive shaft, a shaft passage to atmosphere can be omitted. Regarding the motors it can be chosen between a high-frequency design with a maximum speed of... [See More]
- Mechanical: Lobed Rotor
- Configuration: Individual Vacuum Pump
- Vacuum Pump Type: Mechanical
- Application: Industrial
from Busch Vacuum Solutions
Higher pumping speed and improved ultimate pressure: Puma WP vacuum boosters increase the performance of your vacuum system, making it more efficient and economical. Available in nine different sizes, Puma WP vacuum boosters can be designed to perfectly suit all rough and medium vacuum applications... [See More]
- Mechanical: Lobed Rotor
- Configuration: Individual Vacuum Pump
- Vacuum Pump Type: Mechanical
- Application: Industrial
from Aerzen USA Corp.
Housing flanges with O-ring-seals, vacuum-tight. Lube oil supply is effected by splash lubrication. Shaft seals by combined oil slinger-piston ring labyrinth seals. The driving shaft is sealed by double radial seal rings with grease barrier. Direction of flow vertical from top to bottom or... [See More]
- Mechanical: Lobed Rotor
- Configuration: Individual Vacuum Pump
- Vacuum Pump Type: Mechanical
- Application: Industrial
from Busch Vacuum Solutions
Quiet: due to an innovative acoustic insulation concept. Compact: minimized footprint, small surface area. Efficient: low energy consumption, reduced operating costs, minimal maintenance. Reliable: robust construction, reliable operation. Flexible: application-oriented. Tyr WT rotary lobe blowers... [See More]
- Mechanical: Lobed Rotor
- Configuration: Individual Vacuum Pump
- Vacuum Pump Type: Mechanical
- Application: Industrial
from Busch Vacuum Solutions
Higher pumping speed and improved ultimate pressure: Puma WP rotary lobe vacuum boosters increase the performance of your vacuum system, making it more efficient and economical. Available in nine different sizes, Puma WP rotary lobe vacuum boosters can be designed to perfectly suit all rough and... [See More]
- Mechanical: Lobed Rotor
- Configuration: Individual Vacuum Pump
- Vacuum Pump Type: Mechanical
- Application: Industrial
from Busch Vacuum Solutions
Higher pumping speed and improved ultimate pressure: Panda WV vacuum boosters increase the performance of your vacuum system, making it more efficient and economical. Available in six different sizes, Panda WV vacuum boosters can be designed to perfectly suit all low and medium vacuum applications... [See More]
- Mechanical: Lobed Rotor
- Configuration: Individual Vacuum Pump
- Vacuum Pump Type: Mechanical
- Application: Industrial
from Busch Vacuum Solutions
Efficient: minimized operating costs. Reliable: robust construction made of GGG40 material, standard mechanical shaft seals, reliable under varying operational conditions, solid lobe design for high particle tolerance. High Performance: high pumping speed due to excellent volumetric efficiency,... [See More]
- Mechanical: Lobed Rotor
- Configuration: Individual Vacuum Pump
- Vacuum Pump Type: Mechanical
- Application: Industrial
from Busch Vacuum Solutions
Efficient: cost-effective, minimized operating costs. Reliable: robust construction, reliable under varying operational conditions, solid lobe design for high particle tolerance. High Performance: high pumping speed due to excellent volumetric efficiency, integrated bypass valve. Easy Servicing:... [See More]
- Mechanical: Lobed Rotor
- Configuration: Individual Vacuum Pump
- Vacuum Pump Type: Mechanical
- Application: Industrial
from Busch Vacuum Solutions
Higher pumping speed and improved ultimate pressure: Puma WP vacuum boosters increase the performance of your vacuum system, making it more efficient and economical. Available in nine different sizes, Puma WP vacuum boosters can be designed to perfectly suit all rough and medium vacuum applications... [See More]
- Mechanical: Lobed Rotor
- Configuration: Individual Vacuum Pump
- Vacuum Pump Type: Mechanical
- Application: Industrial
from Elmo Rietschle Gardner Denver Hanover, Inc.
Volume flow. 430 to 3,960 m ³/hr. 252.9 to 2,329.4 cfm. Pump sets consisting of V-VWZ and rotary lobe pumps. They combine the advantages of fresh oil lubricated vacuum pumps with the high suction capacity of a rotary lobe pump. Primarily used for generating fine vacuum in general industrial... [See More]
- Mechanical: Lobed Rotor
- Configuration: Individual Vacuum Pump
- Vacuum Pump Type: Mechanical
- Pumping Speed: 12.9 to 5049
from Edwards Vacuum
The EH mechanical booster pump, based on the simple Roots principle, remains the favourite pump for applications where high pumping speeds are required for pressures in the region of 0.01 to 10 mbar. This pump must always be backed by another pump, which can deliver against a high-pressure... [See More]
- Mechanical: Lobed Rotor
- Configuration: Individual Vacuum Pump
- Vacuum Pump Type: Mechanical
- Application: Industrial; Scientific; Manufacturing; Pharm/Sanitary; Semiconductor; Metallurgy, Coating
from Tuthill Corporation / Vacuum & Blower Systems
Booster-Liquid Ring Vacuum Systems extend the capabilities of the liquid ring vacuum pump by adding a vacuum booster at the inlet of the liquid ring vacuum pump. The booster supercharges the vacuum pump and reduces the pressure on the inlet side of the booster. Flow ranges extend to approximately... [See More]
- Mechanical: Liquid Ring; Lobed Rotor
- Configuration: Individual Vacuum Pump
- Vacuum Pump Type: Mechanical
- Application: Industrial
from Edwards Vacuum
The EH mechanical booster pump, based on the simple Roots principle, remains the favourite pump for applications where high pumping speeds are required for pressures in the region of 0.01 to 10 mbar. This pump must always be backed by another pump, which can deliver against a high-pressure... [See More]
- Mechanical: Lobed Rotor
- Configuration: Individual Vacuum Pump
- Vacuum Pump Type: Mechanical
- Application: Industrial; Scientific; Manufacturing; Pharm/Sanitary; Semiconductor; Metallurgy, Coating
from Tuthill Corporation / Vacuum & Blower Systems
Kinney ® Booster/Rotary Piston Vacuum Pumping Systems pump high volumes at very low pressures. A high-capacity dry rotary lobe vacuum booster is matched to a smaller rotary piston vacuum pump. For continuous operation below 1 Torr (1.3 mbar a), the vacuum booster can increase the pumping speed... [See More]
- Mechanical: Lobed Rotor; Rotary
- Configuration: Combination
- Vacuum Pump Type: Mechanical
- Application: Industrial; Scientific; Chemical; Manufacturing; Packaging; Pharm/Sanitary; Semiconductor
from Edwards Vacuum
The EH mechanical booster pump, based on the simple Roots principle, remains the favourite pump for applications where high pumping speeds are required for pressures in the region of 0.01 to 10 mbar. This pump must always be backed by another pump, which can deliver against a high-pressure... [See More]
- Mechanical: Lobed Rotor
- Configuration: Individual Vacuum Pump
- Vacuum Pump Type: Mechanical
- Application: Industrial; Scientific; Manufacturing; Pharm/Sanitary; Semiconductor; Metallurgy, Coating
from Edwards Vacuum
The EH1200T160 mechanical booster pump has been certified for use in EX II 2G c IIB T160 classified areas. The temperature classification of the mechanical booster pump is based on the outlet pressure of the pump being maintained below the critical backing pressure of 10 mbar (1 x 103 Pa) at zero... [See More]
- Mechanical: Lobed Rotor
- Configuration: Individual Vacuum Pump
- Vacuum Pump Type: Mechanical
- Application: Industrial; Scientific; Manufacturing; Pharm/Sanitary; Semiconductor; Metallurgy, Coating
from Edwards Vacuum
The EH250C mechanical booster pump has been certified for use in CSA Division 1 area Gas Class I Group C D and Dust Class II Group F G, Temperature Class T3C. The temperature classification of the pump is based on the outlet pressure of the pump being maintained below the critical backing pressure... [See More]
- Mechanical: Lobed Rotor
- Configuration: Individual Vacuum Pump
- Vacuum Pump Type: Mechanical
- Application: Industrial; Scientific; Manufacturing; Pharm/Sanitary; Semiconductor; Metallurgy, Coating
from Edwards Vacuum
The EH mechanical booster pump, based on the simple Roots principle, remains the favourite pump for applications where high pumping speeds are required for pressures in the region of 0.01 to 10 mbar. This pump must always be backed by another pump, which can deliver against a high-pressure... [See More]
- Mechanical: Lobed Rotor
- Configuration: Individual Vacuum Pump
- Vacuum Pump Type: Mechanical
- Application: Industrial; Scientific; Manufacturing; Pharm/Sanitary; Semiconductor; Metallurgy, Coating
from Edwards Vacuum
The Edwards HV8000 high vacuum mechanical booster has been developed to provide high reliability operation in aggressive environments. With a nominal pumping speed of 7200 m3h-1 (4241 ft3 min-1) at 50Hz, it is ideal for large industrial and chemical applications including, steel degassing,... [See More]
- Mechanical: Lobed Rotor
- Configuration: Individual Vacuum Pump
- Vacuum Pump Type: Mechanical
- Application: Industrial; Scientific; Chemical; Manufacturing; Pharm/Sanitary; Semiconductor; Metallurgy, Coating
from Edwards Vacuum
The SN7000 mechanical booster pumps have been developed to provide highly reliable operation in arduous duty cycles and high power applications. With a nominal pumping speed of 7000 m3h-1 (4120 ft3 min-1), it is ideal for large industrial and chemical applications. The SN7000 mechanical booster... [See More]
- Mechanical: Lobed Rotor
- Configuration: Individual Vacuum Pump
- Vacuum Pump Type: Mechanical
- Application: Industrial; Chemical