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Rotary Lobe Vacuum Pumps And Blowers

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Types of rotary lobe vacuum pumps and blowers

The robust construction and high manufacturing quality of rotary lobe vacuum pumps and blowers from Busch ensure outstanding reliability and durability.

Due to their dry operating principle, there is no need for oil or other lubricants.

Product family
Nominal pumping speed
Function
TORRI
100-600 m³/h
vacuum pump
TYR
850-4700 min-1
blower

Powerful and quiet. The modern vacuum and overpressure generator.

Applications

Rotary lobe vacuum pumps and compressors are used in various industries. They are suitable for applications ranging from aeration of liquids to pneumatic conveying of plastic granulates.

Each industry and application has different needs. To find out which vacuum solution fits your needs best, get in touch with our Busch experts.

Find out more about how rotary lobe technology is used in different applications.

Your application is not mentioned? Check out our product finder!

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FAQ

What is a rotary lobe vacuum pump?

A rotary lobe vacuum pump is a positive displacement pump that uses rotating lobes to generate vacuum.

Two three-bladed rotary lobes are mounted in parallel within the housing. They operate in opposite directions. The pumped medium is trapped through the rotation of the lobes, compressed, and transported to the outlet. The minimal clearance between the lobes and the housing optimizes the internal seal.

The oil-free operation makes rotary lobe vacuum pumps ideal for applications requiring dry vacuum environments. They are used for various applications in industries that require reliable vacuum generation, ranging from wastewater treatment to food processing.

How does a rotary lobe vacuum pump work?

Rotary lobe vacuum pumps and blowers operate according to the proven Roots principle. Two rotary lobes are mounted in parallel within the housing. These three-bladed lobes operate in opposite directions. The rotation of the lobes traps the pumped medium, compresses it and transports it to the outlet.

The lobes do not come in contact with each other or the housing. Thus, no lubricants or operating fluids are required in the process chamber.

The two lobes are driven by a pair of gear wheels located on the shaft ends of the gearbox and separated from the compression chamber. This maintains precise synchronous rotor timing.

Vacuum generation of rotary lobe vacuum pumps and blowers explained in three steps

1. Inlet

  • The pumped medium enters via the inlet.
  • Two three-bladed rotary lobes are mounted in parallel within the housing.

2. Compression

  • The rotary lobes rotate in opposite directions.
  • No lubricants or operating fluids are required, as the blades do not come in contact with each other or the housing.
  • With each rotation, the lobes trap and compress the pumped medium.

3. Outlet

  • The compressed medium is expelled through the outlet.

What is the difference between a rotary lobe vacuum pump and blower?

Simply put, a rotary lobe blower generates slight overpressure while a rotary lobe vacuum pump produces vacuum. They operate according to the same principle but are used in different ways. Rotary lobe blowers are usually directly connected to a system that requires overpressure, while rotary lobe vacuum pumps are typically connected to a backing pump.

Are rotary lobe vacuum pumps and blowers positive displacement pumps or blowers?

Yes, they are. Positive displacement vacuum pumps or blowers move gas or air by repeatedly trapping a fixed volume of the pumped medium and moving it mechanically through a system. They maintain a constant flow and speed regardless of changes in pressure.

What is the difference between a Roots blower and a rotary lobe blower?

There are no differences. These are just different terms used to refer to the same blower technology. The rotary lobe principle was invented by the Roots Brothers in Connersville, Indiana. It was patented in 1860 and named after them.

What are the advantages and disadvantages of rotary lobe vacuum pumps and blowers?

Rotary lobe vacuum pumps and blowers from Busch are robust, reliable, and cost-efficient. They have several benefits:

  • Low noise and vibration levels
  • Energy-efficient
  • Robust construction
  • Flow-optimized blower stages
  • Dry operating principle

Vacuum pumps and blowers with this technology are not suitable for chemical and pharmaceutical industries as they cannot handle chemicals or toxic gases.

How do I select the appropriate rotary lobe vacuum pump?

Several factors have to be considered when selecting the right vacuum solution. These factors vary depending on the application and the specific needs of your process.

Use our product finder to find your ideal vacuum pump. Or contact us to find out which vacuum solution fits your needs best. Our Busch experts are happy to help!

What makes Busch one of the leading manufacturers of rotary lobe vacuum pumps and blowers?

Rotary lobe vacuum pumps and blowers from Busch have a large number of accessories and design options that enable individual configurations to match any requirement. For example, the innovative acoustic insulation with integrated inlet and outlet silencers reduces noise levels by up to an additional 20 dB(A). Moreover, our rotary lobe vacuum pumps are characterized by low ultimate pressure and best-in-class chamber pump-down time for load lock chambers.