Vacuum priming centrifugal pump

[Shafayat Ahmmed]

Hi Altruists,
Here is photos vacuum creating part of a centrifugal pump.

I want to know the working principle of this vacuum generating part.
I searched in the internet.
But i dont know exactly what keyword should be used to search for this.
I looking for your support.

 

[Shafayat Ahmmed]

 

[LittleInch]

Looks like a side channel pump.

https://images.app.goo.gl/HJ1NxcK15BpfDBJo6

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[TugboatEng]

It's a liquid ring vaccine pump. If you talk to an old timer in the USA they'll call them Nash priming pumps. Currently, Gilkes is a premier manufacture of centrifugal pumps paired with a liquid ring priming pump.

https://www.gilkes.com/

 

[Shafayat Ahmmed]

Hi Tugboat
In case of liquid ring, there is an eccentricity between the impeller amd casing but here the rotating blade is concentric.Also the delivery and inlet lines do not comply here with a luquid ring pump.
I havr gone through the website of glikes but could not found anything similar to this part

 

[Artisi]

A bit more detail might help, pump brand, model etc - any spare parts book or operating instructions.

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

 

[TugboatEng]

An impeller can be symmetrically mounted in the casing if the casing is elliptical.

The Nash pump is eccentric. I've worked with a brand that I believe in was Sikah which I believe was concentric but I need to look that up.

 

[Shafayat Ahmmed]

It does not look like that casing is elliptical.
Another thing is, there seems to be no line to supply water in the blade region.

 

[Artisi]

Ask yourself, why did I ask the question- will it help overhauling the unit that I assume is what you are trying to achieve?

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

 

[TugboatEng]

The case looks elliptical to me. Set the impeller in there and you will see.

 

[Shafayat Ahmmed]

Thanks a lot mate.
My last question, isnt this impeller has to be submerged in the water to create vacuum??

 

[TugboatEng]

Yes, the water is the pump. It replaces the cam ring and sliding vanes like you would see in a hydraulic pump.

https://youtu.be/sQi46xI0i1M

 

[LittleInch]

I'll try again.

It's really looks like a side channel pump

They have a small dip in the casting which looks spot on. I've never come across them before and not sure why it's being used as a vacuum printer, but do a search if side channel pumps and they look exactness like this pump. E.g.

https://www.northridgepumps.com/article-90_what-are-side-channel-based-pumps

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[Compositepro]

I had a look at your link to side channel pumps, LI. It also refers to them as liquid ring (there is a liquid ring involved) but I agree with Tug. This is a liquid ring vacuum pump with an ellipsoidal chamber, which clearly has two inlet and outlet ports. This is in contrast to the more common liquid ring vacuum pump with an off-center impeller in a circular chamber, which has only one inlet and outlet.

 

[LittleInch]

Fair enough, but look at the casting photo from 3 Jul a few posts above.


We don't freshly know how this thing is being used but may be just part of a self priming unit??

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[Compositepro]

Yes, I believe this is just the priming pump for the main centrifugal. Waiting for confirmation.

 

[Artisi]

It is the priming section of a centrifugal pump, however the OP question was how the liquid ring section work and as for waiting on confirmation - lots of luck.....

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

 

[TugboatEng]

Here is an example:

You can see the volute of the main centrifugal pump and the liquid ring pump is under the cover opposite the drive end. The liquid ring pump has a suction port in the discharge side of the pump and bypasses around a discharge check valve through the visible hose. On loss of prime, the discharge check shuts and the liquid ring pump pulls a vacuum on the main pump casing until it has refilled and can generate enough pressure to open the discharge check.