Hydrocyclone separators

Claim 2

A hydrocyclone axial feed inlet body for use with a hydrocyclone to separate feed material, said axial feed inlet body comprising an upper face, a lower face and a circumferential edge portion extending between the upper face and the lower face to define the body, said body being provided with at least one helical duct, said duct or each of said ducts extending substantially arcuately through the body from the upper face to the lower face about a central axis by less than 360°, each duct being provided with an inlet located in the upper face for receiving an axial flow of feed material and an outlet located in the lower face for discharging the feed material in a substantially tangential flow, said body further comprising an adjustable overflow orifice extending axially along a central longitudinal axis, wherein when the feed material passes through the axial feed inlet body the axial flow of feed material admitted to the inlet or inlets of the helical duct or ducts is transformed to emerge from the outlet or outlets of the helical duct or ducts tangentially or with a swirling, revolving spiral movement and wherein the overflow orifice is adjustable in size.

Claim 3

The feed inlet body of claim 1 wherein two ducts are provided, each duct being spaced from the other by 180°, each duct extending over a sweep of 180° or less.

Claim 4

The feed inlet body of claim 2 wherein each duct extends over a sweep of 120° or less.

Claim 5

The feed inlet body of claim 3 wherein each duct extends over a sweep of 90° or less.

Claim 6

The feed inlet body of claim 3 wherein each duct has a sweep of about 90°.

Claim 7

The feed inlet body of claim 1 in which the upper face is provided with a conduit extending from the upper face wherein the overflow orifice opens into the conduit.

Claim 8

The feed inlet body of claim 6 wherein the conduit further comprises at an upper extremity a tapered opening.

Claim 9

The feed inlet body of claim 1 wherein the size of the overflow orifice can be enlarged.

Claim 10

The feed inlet body of claim 1 wherein the overflow orifice is surrounded by a plurality of flexible sectors, which sectors may deform, thus changing the effective size of the overflow orifice.

Claim 11

The feed inlet body of claim 9 in which the sectors deform to enlarge the effective size of the overflow orifice.

Claim 12

The feed inlet body of claim 1 wherein a crescent shaped passageway leads into the or each helical duct, each crescent shaped passageway having a distal end and a proximal end wherein a bottom surface of each proximal end is co-incident with a bottom surface of the or each helical duct.

Claim 13

The feed inlet body of claim 6 which a circumferential step is provided within the duct or conduit adjacent the overflow orifice.

Claim 14

The feed inlet body of claim 1 wherein each duct is tapered by 6°-8°.

Claim 15

The feed inlet body of claim 1 made from a flexible polymeric material.

Claim 16

The feed inlet body of claim 9 in which the sectors are made from flexible polymers.

Claim 17

The feed inlet body of claim 6 in which the diameter of the conduit is greater than the diameter of the overflow orifice.

Claim 18

The feed inlet body of claim 6 in which a tapered rod is receivable in the conduit for altering the size of the overflow orifice, particularly increasing the size of the orifice to clear any blockages of the orifice.

Claim 19

The feed inlet body of claim 1 in which the overflow orifice is located in the wall forming the lower surface of the inlet body.

Claim 20

The feed inlet body of claim 1 wherein the outlet of the duct in the lower face is at a larger radius than the inlet of the duct in the upper face.

Claim 21

A hydrocyclone separator body comprising an axial feed inlet body for use with a hydrocyclone to separate feed material, said axial feed inlet body comprising an upper face, a lower face and a circumferential edge portion extending between the upper face and the lower face to define the body, said body being provided with at least one helical duct, said duct or each of said ducts extending substantially arcuately through the body from the upper face to the lower face about a central axis by less than 360°, each duct being provided with an inlet located in the upper face for receiving an axial flow of feed material and an outlet located in the lower face for discharging the feed material in a substantially tangential flow, said body further comprising an adjustable overflow orifice extending axially along a central longitudinal axis, wherein when the feed material passes through the axial feed inlet body the axial flow of feed material admitted to the inlet or inlets of the helical duct or ducts is transformed to emerge from the outlet or outlets of the helical duct or ducts tangentially or with a swirling, revolving spiral movement and wherein the overflow orifice is adjustable in size.

Claim 22

A hydrocyclone separator body comprising an axial feed inlet body for use with a hydrocyclone to separate feed material, said axial feed inlet body comprising an upper face, a lower face and a circumferential edge portion extending between the upper face and the lower face to define the body, said body being provided with at least one helical duct, said duct or each of said ducts extending substantially arcuately through the body from the upper face to the lower face about a central axis by less than 360°, each duct being provided with an inlet located in the upper face for receiving an axial flow of feed material and an outlet located in the lower face for discharging the feed material in a substantially tangential flow, said body further comprising an adjustable overflow orifice extending axially along a central longitudinal axis, wherein when the feed material passes through the axial feed inlet body the axial flow of feed material admitted to the inlet or inlets of the helical duct or ducts is transformed to emerge from the outlet or outlets of the helical duct or ducts tangentially or with a swirling, revolving spiral movement and wherein the overflow orifice is adjustable in size.