Method and device for extracting contaminated air by suction
US4397226A · kind A · utility
Inventor
Key dates
| Filing date | Jan 13, 1981 |
| Grant date | Aug 9, 1983 |
| Priority date | — |
| Expiry date | Jan 13, 2001 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB08B15/02
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
In a method of removing contaminated air by suction, ejector air is blown towards a tangentially directed inlet slot (3) in a cylinder (2a) comprising part of an air extractor (1). The contaminated air is entrained in this way to form a rotating air stream in the interior of the cylinder, said air stream also being imparted an axial movement component as a result of underpressure prevailing in the interior of the cylinder. The cyclone effect of the air stream in the cylinder is used to separate contaminated particles from the air and to deposit the particles on the inside of the cylinder. The air stream can also be caused to pass through a cylindrical filter (11) arranged centrally in the cylinder (2a). Blow-openings (8) for ejector air are suitably located in the vicinity of the end of a tangentially directed cylinder-extension portion (2b). The cylinder can be flushed to remove adhering particles therefrom, e.g. by means of a nozzle which is arranged in the slot (3) and which delivers a tangentially directed stream of liquid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.