Centrifugal Pump without shaft - Shaftless Pump!!

Yes I have a design for a direct mechanical driven, glandless pump, not centrifugal but axial. It would act the same in a controlled system as a centrifugal pump. Why do you want to know?

Regards JD.

Dear Sir,

I wnt to know because i was just wondering that if somehow we can replace the shaft with some other mechanism we can overcome many mechanical problems related to wear & tear and vibrations etc.

my point is is this concept feasible according to you???

Glandless pump i'm also having a concept but nothing bout shaft....:(

Have you considered a Diaphragm_pump it does not have a shaft or gland, and works on air pressure.

Regards JD.

Guess not

The impeller must be kept in the correct position relative to the volute. If it slides forward, backwards, up , down or tilt it will touch the volute and damage will be caused.

It may be possible to keep the impeller in position by some other design but that would just be replacing the shaft with another bigger "shaft".

The shaft and bearings may be omitted on close coupled units (using the shaft of the driver) but effective there is still a shaft.

Hmm, this is not quite on point, but I just remembered some of the aquarium pumps that do use a shaft (and bearings) but the rotor of the motor is essentially built as part of the pump impeller, thus at least there is no need for seals on the shaft. You could build either coils (i.e., like a squirrel cage motor) or magnets into an impeller of a suitable material, with the volute also of a suitable material / construction.

So how does the power get in? And what steps are taken to keep exposed conductive surfaces unwetted by the pumped fluid?

If the rotating part (the rotor/impeller) uses permanent magnets they can be exposed to (wetted by) the pump fluid. If the rotating part uses an arrangement like a squirrel cage motor, the rotor can be embedded in (or coated with) a suitable non-conductive, non-magnetic sealant.

In either case, no power is required to the rotor, power is required only to the static windings, outside the volute.

without a shaft....apart from magnetics and ....

What would you propose as a prime mover?

prime mover.....can we make some arrangement in casing itself kk if iot is to be done using electromegnatism what wud you propose???

One could assume that a motor could be built into the impeller of a centrifugal pump so there would be no shaft per say. But the old issue we face of sealing a shaft or any other thing immersed into a liquid would still be there. Only 3 times the probable work and at a very high cost.

The mouse trap we have works pretty good, might not want to tinker to much with a good thing.

I'm just gonna throw this out there...

I've worked with large AC units. The compressors (centrifugal type, variable pitched vanes) on these were hermetically sealed (there are no shaft seals as there are no shafts penetrating the casing, and therefore 0 leakage). While this isn't a shaftless pump, all the rotating parts were internal and it was magnetically coupled. This type of design exists.

I guess I'm not entirely sure where you're going with this thread. Is this what you're driving at?

no that is not wat i'm talking of as if you say that there is a hermetically sealed compressor....on the same lines we have a CANNED MOTOR PUMP in which no shaft or rotating part protrudes out and evrything is canned in side a sealed casing resulting in ZERO LEAKAGE, they are used for Handling RADIOACTIVE & HAZARDOUS CHEMICALS... but i want a totaly different design concept...guess u understand wat i'm upto...