Types of Rotary Compressors FPE

Different types of Rotary compressors
1) Root blower
2) Vane type
3) Screw compressor
4) Scroll compressor

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1. Government Engineering College, Bhavnagar.

2. Branch : 5 th Mechanical Subject : Fluid Power Engineering Topic : Rotary Compressors Prepared by : Amit Makwana (140210119064 ) Dharmesh Baraiya ( 140210119005 ) Hiren Gilatar ( 140210119034 ) Nayan Jasoliya ( 140210119046 )

3. Types of Rotary Compressor : Root Blower Vane Type Screw Compressor Scroll Compressor

4. 1. Root Blower : The Roots type blower is a positive displacement compressor which operates by pumping a fluid with a pair of lobes. Fluid is trapped in pockets surrounding the lobes and carried from the intake side to the exhaust. The most common application of the Roots type blower has been as the induction device on two-stroke Diesel engines .

5. Roots blowers are also used in reverse to measure the flow of gases or liquids, for example, in gas meters.

6. 2. Vane Type Compressor : The Vane type Air Compressor is having a fixed casing and a rotary rotor disc which has slots for holding the sliding plates as shown in the figure. As the rotor rotates, the disc also rotates, thus allowing the sliding plates to slide as the inner surface of the casing is eccentric.

7. Thus the sliding plates moves away from the centre, huge quantities of air will be trapped in, thus as the plates converge, the air gets compressed and thus results in compressed air.

8. 3. Screw Compressor : The screw compressors are efficient in low air pressure requirements. Two screws rotate with each other, thus trapping air between the screws and the compressor casing, forming pockets which progressively travel and gets squeezed and delivering it at a higher pressure which opens the delivery valve.

9. The compressed air delivery is continuous and quiet in operation than a reciprocating compressor.

10. 4. Scroll Compressor : The Scroll type compressors are having scrolls driven by the prime mover. The scrolls outer edges trap air and then as they rotate, the air travel from outwards to inwards thus getting compressed due to the reduction in the area.

11. Thus the compressed air is delivered through the central space of the scroll to the delivery air line .

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