# US 5,705,069 A · Centrifugal water treatment device

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- Number: US 5,705,069 A
- Document ID: US5705069A
- Status: Granted
- Kind: A
- Application number: 08/506,841
- Filed: 1995-08-02
- Granted: 1998-01-06
- Earliest claimed: 1995-08-02
- Assignees: Harusuke Naito
- Inventors: Tadayoshi Nagaoka
- Web page: https://patentgrep.com/patent/US5705069A

## CPC

- B04B 7/18: formed or coated with sieving or filtering elements (filters in general B01D; sieves in general B07B)
- B01D 29/111: {Making filtering elements}
- B01D 29/23: arranged for outward flow filtration
- B01D 29/48: of spirally or helically wound bodies
- B01D 33/067: Construction of the filtering drums, e.g. mounting or sealing arrangements
- B01D 33/11: arranged for outward flow filtration
- B01D 35/06: Filters making use of electricity or magnetism (ultrafiltration, microfiltration B01D61/14; electrodialysis, electro-osmosis B01D61/42; devices comprising filters and magnetic separators B03C1/30)
- B01D 2201/02: Filtering elements having a conical form
- B04B: CENTRIFUGES (high-speed drum mills B02C19/11; domestic spin driers D06F; analysing, measuring or monitoring physical or chemical properties of samples during centrifuging, see the relevant subclasses for these procedures, e.g. G01N)
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)

## Abstract

A water treatment device includes a casing having an outlet of treated water, a screen basket having a peripheral wall portion and a closed end portion and being received in the casing, a screen section provided in the peripheral wall portion of the screen basket, a drive unit for rotating the screen basket, and a water supply section provided in the screen basket and communicating with a source of water to be treated. The screen section of the screen basket includes support rods having a projecting portion in the radially inner end portion thereof and wires of a substantially triangular cross section provided radially inwardly of the support rods and extending in a direction crossing with the support rods, each of the wires being arranged with its one side facing inward and two other sides forming a slit which widens radially outwardly between adjacent wires and with an apex of each wire being welded to the projecting portion of the support rods at crossing points of the wire and the support rods. The width of the slit of the wires is 1 .mu.m or over and less than 100 .mu.m.

## Claims

### Claim 1

A water treatment device comprising a casing having an outlet for treated water;
a frustoconical shaped screen basket having a central axis of rotation, a peripheral wall portion and a closed end portion which is received in the casing;
a screen section provided in said peripheral wall portion of said screen basket;
a drive unit for rotating said screen basket about said central axis of rotation; and
a water supply section provided at said central axis of rotation in said screen basket which is connected to a separate source of water to be treated;
said screen section of said screen basket comprising an inner portion which is radially spaced around said water supply section, said inner portion having support rods having projecting portions in said inner portion which are radially outwardly spaced from said water supply section and including wires of a substantially triangular cross section provided radially inwardly of said support rods and extending in a direction crossing said support rods, each of said wires having a substantially triangular cross section being arranged with a first side which forms an inward portion of said screen and a second and third sides forming respective slits with adjacent triangular shaped wires which widen radially outwardly between adjacent wires in a direction which is opposite said first side and with the apex of each of said wires of a substantially triangular cross section being welded to the projecting portion of said support rods at crossing points of said wires of a substantially triangular cross section and said support rods, and the width of said slits of the wires being from 1 .mu.m to 100 .mu.m wherein said screen section is arranged in such a manner that said slits have major axes which are inclined by 30 to 42 degrees with respect to a plane perpendicular to said central axis of the screen basket.

### Claim 2 (depends on 1)

A device as defined in claim 1 wherein the device further comprises blades in the form of plates secured fixedly to the inside surface of said screen section, said blades having major axes which are inclined by 30 to 42 degrees with respect to a plane perpendicular to said central axis of said screen basket.