Impeller blading of a centrifugal compressor

Assignee: Komatsu Ltd

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Filing: 1977-10-06

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Granted: 1979-09-11

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Expires: 1997-10-06

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Abstract

Abstract Each blade on an impeller disc comprises an impeller portion extending substantially radially of the disc and a centrally located inducer portion on the front side of the impeller portion, the inducer portion being angled from the impeller portion in the direction of impeller rotation. The impeller portion itself is mostly inclined in the direction of impeller rotation, with the angle between the impeller portion and the front face of the disc being about 90 degrees at its inner end and gradually decreasing toward its outer end, where the angle is in the range of from about 50 to 70 degrees. Preferably, these blades are arranged alternately with auxiliary blades which are essentially identical with the impeller portions of the first recited blades.

Inventors

👤 Takeshi Ishihara

Bibliographic Details

Application Number —

Jurisdiction US

Data Source google_patents

Last Synchronized 2026-11-08 19:29

CPC Classifications

F; F04; F04D; F04D29/00; F04D29/26; F04D29/28; F04D29/284; F04D29/30

Claims Analysis

Total Claims: 6

Claim 1

Independent Claim 157 words

An impeller for a centrifugal compressor comprising, in combination, a disc having a hub portion and a plurality of blades fixedly mounted at angularly spaced locations on a front face of the disc, each blade integrally comprising an impeller portion extending substantially radially of the disc and a centrally located inducer portion on the front side of the impeller portion, the angle between the impeller portion of each blade and the front face of the disc being about 90 degrees at the inner end of the impeller portion and gradually decreasing toward the outer end thereof at which the angle therebetween is in the range of from about 50 to 70 degrees, the impeller portion of each blade being thus mostly inclined forwardly with respect to the direction of rotation of the disc, the inducer portion of each blade being further inclined forwardly from the impeller portion with respect to the direction of rotation of the disc.

Claim 2

Dependent Claim 157 words

Claim 3

Dependent Claim 35 words

The impeller as recited in claim 1, wherein the angle (c) of the impeller portion of each blade as seen in a front view is in the range of from 6 to about 14 degrees.

Claim 4

Dependent Claim 28 words

The impeller as recited in claim 1, wherein the angle (d) of the inducer portion of each blade as seen in a front view is about 30 degrees.

Claim 5

Dependent Claim 36 words

The impelleer as recited in claim 1, further comprising a plurality of secondary blades of auxiliary nature fixedly mounted on the front face of the disc in radial arrangement and alternately with the first recited blades.

Claim 6

Dependent Claim 75 words

The impeller as recited in claim 4, wherein each secondary blade is shaped and sized substantially like the impeller portion of each first blade, and wherein the angle between each secondary blade and the front face of the disc is about 90 degrees at the inner end of the second blade and gradually decreases toward its outer end at which the angle therebetween is in the range of from about 50 to about 70 degrees.

References Cited (Backward Citations)

DE959692C Cited

GB594537A Cited

US2648493A Cited

US2965287A Cited

FR1325267A Cited

US3481531A Cited

DE2021260A1 Cited

US3984193A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1982-09-10	1983-03-12	1983-09-11	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1986-09-10	1987-03-12	1987-09-11	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1990-09-10	1991-03-12	1991-09-11	$7700.00	Window Closed / Lapsed

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