Patent ID: 8696299
Filing Date: 2014-04-15
Classification: F02B,F04D,F05D,Y02T

Abstract:
1. A compressor comprising: a housing having a gas inlet and a gas outlet; an impeller wheel having a plurality of vanes and mounted in the housing between said inlet and outlet, the wheel being rotatable about an axis; the housing having an inner wall defining a surface located in close proximity to radially outer edges of the impeller vanes which sweep across said surface as the impeller wheel rotates about its axis; the gas inlet comprising an outer tubular wall extending away from the impeller wheel in an upstream direction and defining a gas intake portion of the inlet, and an inner tubular wall extending away from the impeller wheel in an upstream direction within the outer tubular wall and defining an inducer portion of the inlet; a gas flow passage defined between the inner and outer tubular walls; at least one bleed passage providing fluid communication between the impeller wheel and the gas flow passage; a sliding member disposed in the inlet and slidable between a first position in which the bleed passage has a minimum size and a second position in which the bleed passage has a maximum size; wherein the sliding member is arranged to move between the first and second positions in a direction that describes substantially at least part of a helix.