Technology
Rotary lobe blowers
Two counter-rotating rotary lobes convey the air without contact and without oil in the conveying chamber – as vacuum or overpressure generators. 16 current models from Busch, comparable by flow rate and rated motor power.
Compare 16 modelsHow the technology works
- 16models
- 1series
- 1manufacturer
- 4,000 m³/hhighest pumping speed (50 Hz)
Touch the points: the parts explain themselves.
Product overview
Compare all 16 models
The filters on the left narrow down the selection by the key figures of the models – for 50 or 60 Hz.
TYR WT 0100 CPPumping speed 535 m³/h 50 Hz535 m³/h 60 HzRated motor power 18.5 kW 50 Hz18.5 kW 60 HzTYR WT 0100 CVPumping speed 538 m³/h 50 Hz538 m³/h 60 HzRated motor power 11 kW 50 Hz11 kW 60 HzTYR WT 0150 CPPumping speed 808 m³/h 50 Hz808 m³/h 60 HzRated motor power 30 kW 50 Hz30 kW 60 HzTYR WT 0150 CVPumping speed 822 m³/h 50 Hz822 m³/h 60 HzRated motor power 18.5 kW 50 Hz18.5 kW 60 HzTYR WT 0280 CVPumping speed 1,330 m³/h 50 Hz1,330 m³/h 60 HzRated motor power 30 kW 50 Hz30 kW 60 HzTYR WT 0280 CPPumping speed 1,355 m³/h 50 Hz1,355 m³/h 60 HzRated motor power 45 kW 50 Hz45 kW 60 HzTYR WT 0390 CPPumping speed 1,793 m³/h 50 Hz1,793 m³/h 60 HzRated motor power 55 kW 50 Hz55 kW 60 HzTYR WT 0390 CVPumping speed 1,907 m³/h 50 Hz1,907 m³/h 60 HzRated motor power 37 kW 50 Hz37 kW 60 HzTYR WT 0600 CPPumping speed 2,973 m³/h 50 Hz2,973 m³/h 60 HzRated motor power 90 kW 50 Hz90 kW 60 HzTYR WT 0600 CVPumping speed 3,097 m³/h 50 Hz3,097 m³/h 60 HzRated motor power 55 kW 50 Hz55 kW 60 HzTYR WT 0600 CP PLUSPumping speed 3,100 m³/h 50 Hz3,100 m³/h 60 HzRated motor power 30 kW 50 Hz30 kW 60 HzTYR WT 0600 CV PLUSPumping speed 3,100 m³/h 50 Hz3,100 m³/h 60 HzRated motor power 18.5 kW 50 Hz18.5 kW 60 HzTYR WT 0730 CPPumping speed 3,972 m³/h 50 Hz3,972 m³/h 60 HzRated motor power 90 kW 50 Hz90 kW 60 HzTYR WT 0730 CVPumping speed 3,992 m³/h 50 Hz3,992 m³/h 60 HzRated motor power 75 kW 50 Hz75 kW 60 HzTYR WT 0730 CP PLUSPumping speed 4,000 m³/h 50 Hz4,000 m³/h 60 HzRated motor power 37 kW 50 Hz37 kW 60 HzTYR WT 0730 CV PLUSPumping speed 4,000 m³/h 50 Hz4,000 m³/h 60 HzRated motor power 30 kW 50 Hz30 kW 60 HzNo model matches these filters.
TYR series 16 models
Models that a manufacturer no longer carries in its current range are not part of this overview; they are listed in the manufacturer’s “Outdated models” section.
Operating principle
How a rotary lobe blower works
Rotary lobe blowers work on the Roots principle: two rotary lobes are mounted in parallel in the housing and turn in opposite directions without touching each other or the housing. Between lobe and housing wall they trap the air and carry it from the inlet to the outlet; compression only takes place there, against the higher pressure of the discharge side. The drawing shows three-bladed lobes as Busch uses them in the TYR series; two-bladed lobes work on the same principle.
The drawing shows the basic principle. The designs of the individual manufacturers differ in detail.
- SuctionThrough the inlet (A) the air flows into the cell (D) that two blades of a rotary lobe (C) form with the housing (B).
- TransportThe following blade cuts the cell off from the inlet. The air is carried along the housing wall to the outlet without compression.
- DischargeAt the outlet (F), air flows from the discharge side into the cell and compresses its contents; the lobes then push the air out. The gap (E) separates the discharge side from the suction side.
Key figures
The technology in figures
The ranges result from the current models in our range.
Pumping speed (50 Hz)
535 to 4,000 m³/hin our range
Rated motor power (50 Hz)
11 to 90 kWin our range
Differential pressure instead of ultimate pressure
A rotary lobe blower is not selected by an ultimate pressure but by flow rate and differential pressure. The manufacturers therefore state the maximum differential pressure – as a vacuum for the vacuum version, as an overpressure for the pressure version. It is given in the technical data of the models.
What characterises the technology
Vacuum or overpressure
Rotary lobe blowers are available as a vacuum version and as a pressure version. For the TYR series, Busch states that a conversion is possible at any time.
Dry conveying chamber
The rotary lobes run without contact; no operating fluid is needed in the conveying chamber. Only the gearbox, which is separated from the conveying chamber, needs oil.
Drive and control
In the TYR series, an electric motor drives the blower stage via V-belts; the belt tension is maintained automatically. The PLUS versions control pressure and speed with a frequency converter.
Silencers
Inlet and outlet silencers are integrated in the TYR series. An acoustic enclosure is available as an option.
Advantages
What speaks for this technology
- Contact-free operating principle
- No operating fluid in the conveying chamber
- As a vacuum or pressure version
- Robust and economical
- Little maintenance
- Integrated silencers
- Frequency control possible
- Comprehensive range of accessories
Applications
Where they work
- Pneumatic conveyingin chemicals, food, plastics and wood processing
- Waste water treatmentmembrane bioreactors, vacuum sewerage, sand filter backwashing, aeration
- Fish farmingsuction conveying of ice for cooling, cleaning of belt and drum filters
- Packaging and handlingblister packaging, cartoning machines, pick-and-place
- Miningaeration of the flotation cell, agitation of the flocculant
- General industryextraction systems, drying, process engineering applications
Frequently asked questions
Questions about rotary lobe blowers
How does a rotary lobe blower work?
Two rotary lobes turn in opposite directions and without contact in the housing. They trap the air between lobe and housing wall and carry it from the inlet to the outlet; compression only takes place there, against the higher pressure of the discharge side. The drawing in the section Operating principle shows every step.
What is the difference between rotary lobe blowers and Roots vacuum pumps?
Both work on the Roots principle. Roots vacuum pumps are built for low pressures and usually work together with a backing pump. Rotary lobe blowers work against atmosphere without a backing pump – as vacuum generators or as overpressure generators.
What distinguishes the vacuum version from the pressure version?
The vacuum version draws from the process and generates a vacuum; the pressure version delivers air at overpressure. In the TYR series from Busch, the vacuum versions carry the code CV and the pressure versions the code CP.
From which manufacturers does Ehrler & Beck carry this technology?
Currently from Busch. The series are listed in the section Manufacturers and series.
How do I find the right model?
In the product overview, the filters narrow down the selection by the key figures of the models. For sizing, it is best to tell us the gas to be conveyed, the working pressure and the flow rate you need – we will be glad to advise you.
What do the figures for 50 Hz and 60 Hz mean?
Flow rate and rated motor power depend on the mains frequency. The overview therefore shows both values wherever the manufacturer states them, and the size filters can be switched between 50 Hz and 60 Hz.
Does Ehrler & Beck also supply spare parts and service?
Yes. Ehrler & Beck offers original spare parts and accessories as well as maintenance and repair.
Which model fits your process?
Tell us the gas to be conveyed, the working pressure and the flow rate you need – we will advise you on selection, spare parts and service.
