CENTRIFUGAL COMPRESSOR

摘要

An object of the present invention is to decrease a surging limit flow rate at a low flow rate time, by increasing the inflow velocity to the blade of the impeller wheel, by providing a resistive element that narrows in the radial direction a passage cross section of an air intake passage which communicates between a impeller wheel of a centrifugal compressor and an air intake opening.;The centrifugal compressor includes: the compressor housing 9 having the air intake opening 13 opened in a rotary shaft direction, and the air intake passage 11; and the impeller wheel 7 for compressing the air flowing in from the air intake opening 13, inside the housing. The resistive elements 27 and 43 against the air intake flow are provided in either the inner peripheral wall 23 side portion or the center side portion of the air intake passage 11, so that, at the low flow rate time, a cross-sectional area of the air intake passage 11 is narrowed by the resistive elements 27 and 43 thereby increasing the inflow velocity to the blade 19 of the impeller wheel, and the intake air flow is biased to the hub side of the blade 19, and the intake air flow is biased to flow to the hub side or the shroud side of the blade 19.

主权项

1. A centrifugal compressor comprising a housing having an air intake opening opened in a rotary shaft direction and an air intake passage continuous to the air intake opening, and an impeller wheel rotationally disposed centered around the rotary shaft inside the housing and compressing an intake air flowing in from the air intake opening, wherein
a resistive element against an air intake flow is provided in either an inner peripheral wall side portion or a center side portion of the air intake passage, so that, at a low flow rate time, a cross-sectional area of the air intake passage is narrowed by the resistive element thereby increasing an inflow velocity to a blade of the impeller wheel, and intake air is biased to a hub side of the blade by an inner peripheral resistive element provided on the inner peripheral wall side portion of the air intake passage, and intake air is biased to flow to a shroud side of the blade by a center resistive element provided on the center side portion.