filter centrifuge

in Machine Design held by MFTCC
Contest Ended, Winner(s) have been selected.
Description:
Drawing a simple machine

The power point will likely be best to view.
Wants:
A (or a number of) 2 D drawing(s) and a 3 D drawing that are suitable quality so that a person could versed in the art could build the machine.
Don't Wants:
I want my drawing made into something that look professional, both a 2 dimensional and a 3 D drawing
Software:
  1. I use VIA CAD

Entries

1st Winner
#2 Filter.centrifuge.02 by Zaher
Jan 17, 2013 4:22
#1 Filter.Centrifuge.01 by Zaher
Jan 13, 2013 20:40
#3 Filter.centrifuge.03 by Zaher
Jan 22, 2013 7:28

Discussion

Thu, 10 Jan 2013 21:48:51 +0000
Hi

I know you have done some basic sketches in the power point file, However, it is not very clear regarding the baffle arrangement and other components. It will help very much if you could do a pencil sketch of a section view of the components described which will be the basis of the scheme design. What is the RPM of the inner chamber.

Thanks Neil

MFTCC

Buyer

Thu, 10 Jan 2013 04:13:26 +0000
The inner assembly is 1.5 meters in diameter.
For the final patent I will not want to restrict my self to these dimensions.

MFTCC

Buyer

Thu, 10 Jan 2013 04:09:57 +0000
Thank you Neil/Zaher

Solid works or anything you like to use. I would like to be able to change dimensions for when I am doing the pilot rather than commercial scale but I can do that by hand. Also the liquid levels are not set and will likely change as I learn more. Also the discharge chamber maybe larger or smaller. Having said that, the dimensions to use are
--10 meter high, 2 meters in diameter, for the outer shell
--the inner assembly is to fit inside the outer shell, the plates top and bottom are 8 cm thickest at the centre thinner at the outer diameter. The gas space above gets thicker as the plate get thinner.
--The bearing are only bearing at the edge and the inner part is a plate that can have holes in it, that conduct the valves and the tubing and the shaft (not just a bearing, but an element which has a sealed bearing as part of it).

Because everything is rotating the valves and the tubing must go through the bearing plate area, along the main shaft. Every thing in the inner assembly including the fluids rotate at the same speed (so in a relative sense everything is stationary to one another). The outer assembly is a stationary an so in a relative sense the inner assembly is spinning. The inner assembly includes the paddles and the baffles are necessary for the depth of the liquids (20 cm from the honey comb wall). The baffle and paddles are there to ensure that liquids in the move at the exact same velocity as the inner assembly equipment and to support the outer honeycomb wall of the inner assembly. The liquid level that inside the inner assembly is 20 cm from the honeycomb walls which the floats sit on controlling the liquid level. If the level rises more the float push open the valve letting the water into the tubing. The baffle and paddles (really the same thing) need to be connected to the centre shaft.

A pressure difference is required to get the liquids (mostly water) from the inner assembly to the outside chamber as the head developed in the centrifuge tubing, thus the need for the pressure valves. The tubing in the outside chamber is a longer than the inner tubing to use the siphoning effect to draw out the water. There is no way to have this connection between the inner assembly and the outer top chamber that isn't rotating.

The feed, lean water with fine particulate in it, enter the discharge chamber via the outside wall. The fluids in the discharge space are spinning because of the energy imparted on them by the spinning inner assembly. The rotational velocity, very much like a hydro cyclone moves the denser materials to the wall by generating a centripetal force about 10 time gravity. Larger particles will be removed in this part of the centrifuge, but in general smaller particles in the turbulent flow will remain suspended, At the honey comb wall the fine particles try to follow the bulk water flow into the inner assembly. Here in the narrow tubes the turbulence is quickly damped out with the walls of the honey comb, and the flow becomes unidirectional. The centripetal force pushes any particle out of the tube, back into the discharge chamber against the buoyancy force and the drag forces for particles larger than the 1 micron at design rotational velocities. Smaller particles can be removed by increasing the rotational velocities but then erosion become more of a concern...so processes further downstream are use to get at these very small particles.

Since the solid particles accumulate in the discharge space, the density of the material there continually increases, until the den-so-meter detect it is the required density (basically thick mud) and it is removed via worm pump gearing, at the bottom of the outer assembly.

The gas spaces are pressure up to match the pressure generate by the inner assembly. Have gas in those spaces, top and bottom minimizes erosion. Another important aspect of the gas spaces is that the pressure on the bottom plate relative to the top plate can be adjusted to give a zero bearing load once rotation starts. However it is important that the gas level does not move past the bottom plate or the top plate and get into the inner assembly, thus the need for the Pressure controller, through the stationary outer assembly.


I hope I have covered everything,





Tue, 08 Jan 2013 20:28:19 +0000
Hi There

Zaher and I require more info as previously requested. Please answer ASAP

Can this project be completed in Solidworks, as final drawings can be created into PDF's?

Thanks

Neil

Zaher

Designer

Mon, 07 Jan 2013 22:06:34 +0000
Hello,

I have a few questions and notes:

- I don's see sizes or dimensions specified for this device except for the honey comb holes
- tubes can't go through the bearings unless they are of a very small diameter comparing to the bearings' thickness, is it necessary for it to go through the bearing?
- is the shaft and paddles the only parts rotating in this device?
- can you please explain briefly in words the working principle of the device stating all the inlets and outlets used in the process.

Thanks,
Zaher

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