Instead of two-lobe rotors, however, three-lobe or even four-lobe rotors are usually used. In order to achieve a more continuous compression and thus avoid pressure surges, the rotors are also twisted along their axis of rotation.
The cross-sectional profile of the rotors consists of cycloids. Due to the contact-free meshing, however, it is not a cycloid gearing in the true sense! Roots-type blowers are used, among other things, as compressors for supercharging combustion engines.
They are also used for pumping liquids or foodstuffs such as rice or cereals. The animation below shows the structure and the functional principle of a Roots-type supercharger as it is used for charging the combustion air in automobiles.
The air is sucked in through a slot at the front. The air enters the housing through this air inlet, which is equipped with cooling fins. Inside the Roots-type supercharger are the three-lobed rotary vanes rotors , which pump the air between the rotors and the inner wall of the housing from the suction side top to the discharge side bottom.
The rotary vanes are driven by a belt drive , whereby the driving pulley drives only one of the two rotors directly. The second rotor is driven by two helical gears. Once the air has been pumped to the pressure side, the compressed air can be used for the combustion process. Application of Root blowers are as follows :.
Root blowers has some advantages over another type of compressor, they are as follows,. Technical Mechanical Interview Question and Answers. Fluid Mechanics - Notes , articles , Interview Que. Currently, he is working in the sheet metal industry as a designer.
Additionally, he has interested in Product Design, Animation, and Project design. He also likes to write articles related to the mechanical engineering field and tries to motivate other mechanical engineering students by his innovative project ideas, design, models and videos. Your email address will not be published. The contaminated air is then processed to remove the hydrocarbons and solvents and allow safe and immediate exhausting into the atmosphere.
Oil-free roots blowers are used to provide air for ozone production and filter flushing in drinking water purification systems. Oil-free roots blowers are used to supply air to many food processing and pharmaceutical manufacturing processes.
Note that beverages and poultry are included in food processing. Vacuum and pressure pneumatic conveying is used to transfer powder and granular materials such as flour, salt, sugar, grain, spices, chocolate and milk powder for food processing.
Dry bulk chemicals are similarly conveyed in the production of many pharmaceuticals. Roots blowers are used to supply vacuum equipment that operates packaging machines. It is common for food and pharmaceutical plants to have large wastewater treatment systems used to decontaminate processed water and treat organic waste. Refer to the environmental section to see how roots blowers are applied in that industry. Roots blowers are used in marine diesel engine supercharging. They are also used to provide an air supply to bubbler systems on icebreaker and other Arctic duty vessels.
They pump inert gas for fuel tank blanketing in tanker ships, and power emergency steering and braking systems on ships. Roots blowers are used to load and unload dry bulk material ships and barges with pneumatic conveying systems. Cruise ships and military craft with large numbers of passengers or crew operating on board have the aeration process within wastewater treatment systems powered by roots blowers.
Marinas, locks and harbors use roots blowers to drive air bubbler systems to ensure equipment will operate at sub-zero temperatures. Roots blowers are extensively used in the mining of most minerals, including copper, nickel, gold and diamonds. They are used to pneumatic convey dry bulk materials and provide air for oxidation processes and other refining applications.
Roots blowers are used to filter and dry slurry and power high capacity vacuum pumps. Many mines have large wastewater treatment facilities to allow for the decontamination of processed water, a process requiring roots blowers for aeration. Roots blowers are used for material handling and pollution control processes throughout the power generation industry. They are used to pneumatic convey fly-ash and lime in both vacuum and pressure modes and are an important part of flue gas desulphurization oxidation.
Roots blowers are used to transfer various bulk dry materials to and from trucks, railway cars, storage silos and hoppers. Roots blower application occur in many industries and industrial processes.
There are many industrial pressure roots blower applications, from assisting in combustion by pumping air or gas into burners, furnaces and forges to pressurizing paper mill head boxes. The following are some typical examples:. Roots blowers are frequently used as vacuum pumps.
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