Grease extractor

A grease extractor for removing grease from a grease laden air and discharging a clean air after removal of the grease, said grease extractor comprising:

• a vessel having an inlet for introducing the grease laden air and an outlet for discharging the clean air,
• a plurality of separator units disposed in said vessel between said inlet and said outlet, each of said separator units comprising:
• a casing with an intake port and an exit port which define therebetween a flow path for said grease laden air,
• a centrifugal fan for receiving air inwardly and directing air outwardly provided in said flow path between said intake port and said exit port for generating a forced flow for forcing said grease laden air from said intake port toward said exit port along said flow path, said fan having a circumferential fan surface;
• a centrifugal fan provided in said flow path between said intake port and said exit port, said centrifugal fan having a rotation axis about which said centrifugal fan rotates for receiving air axially inwardly and directly air radially outwardly to generate a forced flow for introducing said grease laden air through said intake port and forcing said air to said exit port along said flow path, said fan including baffle means which deflects said grease laden air so as to separate said grease therefrom and coagulate said grease into corresponding grease particles, said fan having a circumferential fan surface and provided on said circumferential fan surface with flow converting means which converts a radial air flow into an axial air flow directed outwardly from said fan substantially along said rotation axis;
• and
• a grease trap member disposed downstream of said fan and between said intake port and exit port, said grease trap member being defined on an interior wall of said vessel radially outwardly of said fan surface such that said grease particles flown radially outwardly on said grease laden air through said fan surface are caused to collide against said trap member and deposit thereon while said flow converting means allows said air passing through said fan surface to deflect axially so as not to be directed against said grease trap member at a portion in an directly radially opposed relation to said fan surface, said grease trap member including recovery means for collecting and draining deposited grease out of said vessel;
• said separator units being arranged in series between said inlet and output in such a manner as to communicate the intake port and the exit port between the adjacent units, to communicate said intake port of a first upstream one of said separator units with said inlet and to communicate said exit port of the last downstream one of said separator units with said outlet.