A Presentation on

ROOT BLOWERBy

Mr. Prathmesh A. tapdiya(BE Mechanical)

Guide :Prof. S.Mayekar

Department of Mechanical Engineering FAMT, Ratnagiri

What is air compressor ? A compressor is a devise which take in gas or

vapor, increases its pressure and deliver it at high pressure.

Blower is a one type of air compressor

Blowers

ROOTS BLOWER VANE BLOWER

TYPES OF BLOWER

Root blowers

Example of blower

Construction:-1. A root blower consists of two rotors with lobes rotating in a air tight casing. 2. The casing has inlet and outlet PORTS ON OPPOSITE SIDES. 3. Root blower has two or three lobes as given in fig.

WORKING:- The lobes are so designed that they provide an air tight joint at point of their contact.

One of the rotors is rotated by external means. The other is gear is driven by the first one. When the rotator rotate, the air at atmosphere pressure is trapped in the pockets formed between rotor and casing. The rotary motion of the lobes deliver the entrapped air into the receiver. Thus more and more air is delivered in to the receiver. This increases the pressure of air in the receiver. finally the air is used at required pressure from the receiver.

When rotating lobs uncovers the outlet port, some high pressure air flows back into pocket from the receiver. This process is know as backflow process. The back flow of air from receiver to the pocket Continuous until the pressure in pocket and receiver become equal. Thus the pressure of entrapped air in the pocket increases at constant volume by the backflow of air.

Video of two lobe root blower

Video of Three lobe root blower

Video of applications of root blower

A roots-blower quickly attains the full number of revolutions;

The power demand in the partial-load range is lower.

Roots-blower advantages

A conveying speed once chosen can only be altered with considerable expenditure;

In order not to exceed the operating pressures, a control device must be installed; on account of the narrow piston clearance

The roots-blower is sensitive to foreign matter, i.e., Filter cleaning of the conveying air is required;

After a longer period of use, the piston clearance becomes larger and leads to capacity losses.

Roots-Blower Disadvantages

Applications

Air knives Drying Paper industry Flour mills Jet pulse filters, blowers supply pressurized air for pulse

jets Vacuum systems, vacuum handling Biodiesel plants Dust collection systems Sand blasting processes Painting machines Kenitex applications Grain handling Agriculture applications

Other application

Thank you