Centrifugal compressor
A centrifugal compressor includes: an intake flow path connected to an intake port; a compressor impeller disposed in the intake flow path; a movable member provided on the intake port side with respect to the compressor impeller in the intake flow path, the movable member movable to a protruding position protruding into the intake flow path and a retracted position retracting from the intake flow path; a first end that is an end, on the compressor impeller side, of an inner curved surface of the movable member; a second end that is an end, on the intake port side, of the inner curved surface of the movable member; and an extending portion between the first end and the second end, the extending portion extending in a direction corresponding to a rotation axis direction of the compressor impeller.
1 . A centrifugal compressor comprising:
an intake flow path connected to an intake port;
a compressor impeller disposed in the intake flow path;
a movable member provided on an intake port side with respect to the compressor impeller in the intake flow path, the movable member movable to a protruding position protruding into the intake flow path and a retracted position retracting from the intake flow path; the movable member comprising:
a first portion that is a portion having an arc shape in a cross section taken along a rotation axis of the compressor impeller, provided on a compressor impeller side, of an inner curved surface of the movable member,
a second portion that is a portion having an arc shape in a cross section taken along the rotation axis of the compressor impeller, provided on the intake port side, of the inner curved surface of the movable member;
an extending portion between the first portion and the second portion, of the inner curved surface of the movable member, the extending portion extending in a direction corresponding to a rotation axis direction of the compressor impeller; and
a groove extending in a circumferential direction of the compressor impeller is included on a surface of the movable member facing the intake port side,
wherein a connection position between the second portion and the extending portion is located on the compressor impeller side with respect to a center of the movable member in the rotation axis direction, and
wherein a curvature radius of the second portion is larger than a thickness of the movable member in the rotation axis direction.
2 . The centrifugal compressor according to claim 1 ,
wherein the curvature radius of the second portion is larger than a curvature radius of the first portion.
3 . The centrifugal compressor according to claim 1 ,
wherein a fillet portion is formed between the second portion and a surface of the movable member facing the intake port side.
4 . The centrifugal compressor according to claim 2 ,
wherein a radial distance between an inner circumferential edge of a surface of the movable member facing the intake port side and the extending portion is less than or equal to 80% of a thickness of the movable member in the rotation axis direction.
5 . The centrifugal compressor according to claim 1 ,
wherein a radial distance between an inner circumferential edge of a surface of the movable member facing the intake port side and the extending portion is less than or equal to 80% of a thickness of the movable member in the rotation axis direction.
6 . The centrifugal compressor according to claim 3 ,
wherein a radial distance between an inner circumferential edge of a surface of the movable member facing the intake port side and the extending portion is less than or equal to 80% of a thickness of the movable member in the rotation axis direction.
7 . The centrifugal compressor according to claim 2 ,
wherein a radial distance between an inner circumferential edge of a surface of the movable member facing the intake port side and the extending portion is greater than or equal to 20% of a thickness of the movable member in the rotation axis direction.
8 . The centrifugal compressor according to claim 1 ,
wherein a radial distance between an inner circumferential edge of a surface of the movable member facing the intake port side and the extending portion is greater than or equal to 20% of a thickness of the movable member in the rotation axis direction.
9 . The centrifugal compressor according to claim 3 ,
wherein a radial distance between an inner circumferential edge of a surface of the movable member facing the intake port side and the extending portion is greater than or equal to 20% of a thickness of the movable member in the rotation axis direction.
10 . The centrifugal compressor according to claim 1 ,
wherein the groove is recessed from the surface of the movable member facing the intake port side toward a surface of the movable member toward the compressor impeller side.
11 . The centrifugal compressor according to claim 10 ,
wherein the groove is recessed adjacent to an end of the second portion.
12 . The centrifugal compressor according to claim 10 ,
wherein the groove has a rectangular cross-section.