Lobes of Roots Blower

Have you looked at the following?

ACME Air Equipments Company Pvt. Ltd.
Plot - 57 / 3, 4, 5,
Phase I,
GIDC, Vatva,
Nr. Kiran Industries,
Ahmedabad - 382445.

Gujarat, India

Would it not be better to buy a complete new blower from another (reliable) company?

They will have to as getting someone to execute a lobe design (guaranteed) would cost far more than a new machine.

The terminology is bad - it should be either rotary lobed blower or Roots type of blower. It is not a Roots blower.

I don't understand how you can say that.....

Here is a good link about Roots Blowers:-

Roots blower

Here is a Diagram of a Roots Blower:-

A Roots blower
Diagram:
1. Rotary vane 1
2. Pump body
3. Rotary vane 2
a. Intake
b. Pumping
c. Forced air or air-fuel mixture into intake manifold

Surely they could also be called "Lobes"?

In the Wiki article they quoted near to the above diagram:- "Unlike the basic illustration, most modern Roots-type superchargers incorporate three-lobe or four-lobe rotors."

Maybe I did not understand your terminology!!

Search for rotary lobe compressor - all sorts of hits - some of them for the 2 lobe machines and some for more. Somewhere along the way they turn into a screw compressor - though only in the smaller sizes.

I have no idea why someone selected the term but that is what is commonly used. The ones we used were always the biggest either Roots or Aerzen built.

You aren't explaining your previous comments....thats what we want to understand fullly. When you said it wasn't a Roots Blower.......check back.

So please try again, thanks in advance.

Root is a company name and often used to describe a type of rotary lobe (impeller) blower.

Roots Dresser is still in business so it must not be manufactured by Roots.

Your original comment which was slightly misleading (could be taken two ways) was:-

"it should be either rotary lobed blower or Roots type of blower. It is not a Roots blower."

Which can be taken one of two ways.

It would have been clearer if you had written:-

"it should be either rotary lobed blower or Roots manufactured type of blower. It is not a Roots manufactured blower."

We tend to use the name "Roots Blower" for any of these type of blowers no matter who made it. Rather like Hoover for any vacuum cleaner or Biro (in the UK at least) for any ballpoint!!!

The original manufacturer's name is (wrongly really!) re-used for other similar products......

Great sharing! Thanks for your information. I would also like to share you my articles about roots blower and ring blower, hope you will like it.

A rose is a rose by any other name.

The principle of the Roots compressor/blower was discovered by two brothers in the mid 1800's. They were Philander H. and Francis M. Roots, joint owners of a woollen mill in Connersville Indiana. The positive displacement blower was named after them and the original Roots Blower Company was formed, however the name is widely used by various manufacturers to describe a generic type of compressor/blower.

The Roots blower was exhibited in Paris during 1867 and was looked upon (at the time) as a potential answer to the difficult problems of deep mine ventilation.

About forty years later a rival blower manufacturer was formed in the same city, called Connersville Blowers. The companies competed with each other until 1931 when they were both bought out by a third party and merged.

Capital investment required is too much. We Indians care for limited global resources. We believe in using everything till it stops functioning and becomes a throw-away piece. Even after that we use it as a monument because it will have a heritage value. Once this blower stops functionig, we will use this blower for showing students / trainee engineers.

Any way I'm sure I will find somebody who will do this job for us less than the in a cost of new equipment.

As far as terminology is concerned I was interested only in getting maximum response to my query. For me Roots Blower / Twin Lobe blower is same as Xerox copy / Photocopy

If anybody is feeling happy by showing my mistakes, better he/she should not participate in such discussions.

I ran projects in your country for 15 years. I know the tendency to try to do things the hard way at times.

These lobes are an engineered component - not just something you turn on a lathe. Having said that, there are companies manufacturing this type of blower in India though only of very small sizes.

I think the general feeling is more that getting a company to tool up and make two new lobes is still going to cost more (even in India) than a new blower....or so close to that having a:-

"repaired, old, unsure how long it will last again (one year, maybe two?), no guarantee blower"

will not be a good option against:-

"A new with full guarantee blower".......

Remember, you do not even possess the design details that an engineering company will need to be able to make a reliable blower again......or so it appears here.....

Unless you can order spares from the company that made the original blower (not necessarily the company that made the complete unit!!), all other options will normally have some negative aspects.

Even ordering original spares would appear not even to be a really good option as the original unit did not appear to have lasted all that long according to the supplied infos......though bthat is more of a guess on my part, could be wrong....How long did the original unit last from new?

We have 2 similar installations. The blower has two ( interconnected ) stages driven by a centrally placed motor. They are in use since 1983.

We face failures only in 2nd stage where most of the times lobes fail ( break into pieces ). Our experience is that failures are due to wrong operation and not quality or workmanship of spares.

Replacing total equipment ( 2 installations ) is the last option we would exercise. We are working on the same simultaneouly.

However I would never like to throw away my suit beacause I'm not getting original ( gold ) buttons.

I got the ( price offer from ) vendor who used to manufacture lobes for OEM of our blower. Thank god. They are not looting us.

Any way I learned a lot through this discussion.

Thanx everybody.

Have you tried to contact Dresser Roots Blowers, Connersville, Indiana, USA. I believe the Japanese supplier has made a copy, but Dresser originated the design and supply. I have forwarded your request to them.

Hi Tom, Must not be either Roots or Kobelco as both are still in business. This must be some other small brand.

So called small brand is M/s.Fuji-Gokin Air Machinery Co.Ltd., Japan.

Roots Blower is our regular vendor and we have good relations with their Indian representatives.

Hey Russ,

Good to hear from you. Yes I agree on the supplier. As someone said the original design gave it the name. I think I've seen a hundred copies of Roots type blowers around. Use to call them Loots.

There are aftermarket companies in the US that make replacement lobes. Different sizes. For the 2 stage the big problem was the slippage and heat generated from 1st stage. Some manufacturers just upped the alloys in the casting. this deterred metal expansion and catastrophic failure. Others tried increasing slippage but had to forgo capacity.

anyway I'll try to see who might want the business. Need to know what they want though.

Tom

I know two firms who make two lobe blowers in India. M/s SWAM, NOIDA and M/s Everest Transmission, New Delhi. Pl contact them.