# US 5,332,425 A · Air purifier

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- Number: US 5,332,425 A
- Document ID: US5332425A
- Status: Granted
- Kind: A
- Application number: 08/021,016
- Filed: 1993-02-22
- Granted: 1994-07-26
- Earliest claimed: 1993-02-22
- Assignees: Hung Hsing Electric Co., Ltd.
- Inventors: Ping Huang
- Web page: https://patentgrep.com/patent/US5332425A

## CPC

- F24F 8/30: by ionisation
- B01D 46/10: Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
- B03C 3/155: Filtration
- B03C 3/32: Transportable units, e.g. for cleaning room air
- B03C 3/41: Ionising-electrodes
- F24F 1/0071: with means for purifying supplied air (perfuming or deodorising means F24F1/008)
- F24F 8/80: Self-contained air purifiers
- B01D 2273/30: Means for generating a circulation of a fluid in a filtration system, e.g. using a pump or a fan
- B01D 2275/10: Multiple layers
- F24F: AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING (removing dirt or fumes from areas where they are produced B08B15/00; vertical ducts for carrying away waste gases from buildings E04F17/02; tops for chimneys or ventilating shafts, terminals for flues F23L17/02)
- 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)
- B03C: MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS (separating isotopes B01D59/00; combinations of magnetic or electrostatic separation with separation of solids by other means B03B, B07B)

## Abstract

An air purifier is provided having a purifier housing and an air way housing mounted therein. A fan having a cylindrical whirlpool leaf construction is mounted within the air way housing and air is directed in a predetermined direction through an air exit opening formed in a wall of the purifier housing. An extended and tapered discharging copper needle is electrically coupled to a high voltage generator contained within the purifier housing and produces negative ions. The discharging needle is pointed in contour and has an apex end located adjacent the air exit opening. The discharging needle extends in the direction of the passage of high pressure air from the purifier housing which allows the discharging needle to vibrate responsive to the high pressure air flow and increases the amount of negative ions mixed with the air passing from the purifier housing.

## Claims

### Claim 1

An air purifier comprising:
(a) a purifier housing having an air exit opening formed through a wall thereof for passage of high pressure air therethrough in a predetermined direction;
(b) an operating and display panel mounted on said purifier housing having a plurality of signal lamps;
(c) a multi-layer filter unit mounted within said purifier housing for cleaning air contained within said purifier housing;
(d) an air way housing mounted within said purifier housing for guiding said high pressure air through said air exit opening in said predetermined direction;
(e) a fan mounted within said air way housing, said fan having a cylindrical whirlpool fan leaf construction, said fan being rotatively coupled to a fan motor;
(f) a high voltage generator mounted within said purifier housing for generating a high voltage; and,
(g) an extended and tapered discharging copper needle electrically coupled to said high voltage generator for producing negative ions, said discharging needle having an apex end and an opposing end fixedly coupled to an insulating rod, said apex end of said discharging needle being positionally located adjacent said air exit opening and said discharging needle extending in said predetermined direction to allow said discharging needle to vibrate responsive to the flow of said high pressure air for increasing the amount of said negative ions being mixed with said high pressure air passing from said purifier housing.