Centrifugal compressor and turbocharger provided with said centrifugal compressor

Abstract

The invention provides a centrifugal compressor and a turbocharger provided with the centrifugal compressor. The centrifugal compressor is provided with: an impeller; and a housing in which a helicalscroll flow channel is formed on the outer circumferential side of the impeller, and the circumferential position of the scroll flow channel is expressed by an angular position relative to the windingend of the scroll flow channel. When defining F(theta) = (A / R) / r, the relationships 0.35 <= F(360-degree) <= 0.65 and 0.08 * F(360-degree) <= F(60-degree) <= 0.4 * F(360-degree) are satisfied with respect to the cross-section when the scroll flow channel is intersected by a plane that includes the axis of rotation of the impeller at the circumferential position in which the angular position is theta, where A is the cross-sectional area of the scroll flow channel, R is the distance from the axis of rotation to the scroll center in the cross-section of the scroll flow channel, and r is the radius of the impeller.

Description

technical field [0001] The present invention relates to a centrifugal compressor and a turbocharger having the centrifugal compressor. Background technique [0002] In recent years, the working area of ​​centrifugal compressors needs to be expanded. For example, automotive engines need to improve fuel economy and acceleration performance in the low-speed range, and turbochargers need to expand the operating range on the low-speed, low-flow side. Patent Document 1 describes a centrifugal compressor that does not aim at enlarging the working area on the small flow side, but by changing the enlarging rate of the cross-sectional area of ​​the scroll flow path in the circumferential direction, the effect of the tongue is reduced. Losses caused by peeling between tongue and compressed air to improve efficiency. [0003] prior art literature [0004] patent documents [0005] Patent Document 1: International Publication No. 2012 / 132528 Contents of the invention [0006] The ...

AI Technical Summary

Problems solved by technology

However, the structure of the centrifugal compressor described in Patent Document 1 is not intended to solve the problem of reduced efficiency due to the operation in the above-mentioned small flow area. The peeling range of the working area on the flow side is different, so the working area on the small flow side cannot be enlarged

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