Claims
- 1. A turbo machine comprising:a casing; an impeller having a plural number of blades and being positioned within said casing; first groove portions formed on an inner surface of said casing at least in a vicinity of an inlet of said impeller in an axial direction; and a second groove portion formed in circumferential direction on the inner surface of said casing within a region where the blades of said impeller lie, wherein a portion of fluid raised in pressure by said impeller is turned from said second groove portion back to said first groove portions.
- 2. A turbo machine comprising:a casing; an impeller being positioned within said casing; a first groove portion formed on an inner surface of said casing in a vicinity of an inlet of said impeller, and having a width larger than a depth thereof; a second groove portion formed in circumferential direction on the inner flow surface of said casing within a region where the blades of said impeller lie; and a portion for connecting said first groove portion and said second groove portion.
- 3. A turbo machine comprising:a casing; an impeller having a plural member of blades and being positioned within said casing; a plurality of first groove portions formed in an inlet side of said impeller on an inner surface of said casing, aligned in circumferential direction; and a second groove portion formed in circumferential direction on the inner surface of said casing within a region where the blades of said impeller lie; and a portion for connecting said first groove portions and said second groove portion.
- 4. A turbo machine comprising:a casing; an impeller having a plural number of blades and being positioned within said casing; a plurality of grooves formed on an inner surface of said casing in a direction of fluid pressure gradient, for connecting an inlet side of said impeller and a region on the inner surface of said casing where the blades of said impeller lie; and a member for changing depth of said grooves in the fluid liquid pressure.
- 5. A turbo machine comprising:an impeller; a casing for receiving said impeller therein; a plurality of grooves formed on an inner surface of said casing, confronting an outer peripheral portion of blades of said impeller in an inlet side thereof, for connecting a place in an inlet side of said blades, where recirculation flow is generated when flow rate is low, and a region where tips of said blades lie on the inner surface of said casing, in a direction of gradient of fluid pressure, wherein positions of terminal portions of said grooves in a downstream side of said turbo machine are determined, so that fluid of pressure is taken out, being necessary for suppressing generation of pre-swirl in main flow at an inlet; and a groove formed in a circumferential direction on the inner surface of said casing in a vicinity of the inlet of said blades.
Parent Case Info
This application is a continuation of U.S. Ser. No. 09/531,464, filed Mar. 20, 2000 U.S. Pat. No. 6,290,458, which is a continuation-in-part of application Ser. No. 09/399,132, filed Sept. 20, 1999 U.S. Pat. No. 6,302,643.
US Referenced Citations (15)
Foreign Referenced Citations (4)
Number |
Date |
Country |
229519 |
Jul 1987 |
EP |
2202585 |
Sep 1988 |
GB |
2285485 |
Jul 1995 |
GB |
9510692 |
Apr 1995 |
WO |
Non-Patent Literature Citations (2)
Entry |
Proceedings of US-Japan Seminar Abnormal Flow Phenomena in Turbomachines. |
JMSE Centennial Grand Congress, Inter. Conference on Fluid Engineering, Japan 7/97. |
Continuations (1)
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Number |
Date |
Country |
Parent |
09/531464 |
Mar 2000 |
US |
Child |
09/925539 |
|
US |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
09/399132 |
Sep 1999 |
US |
Child |
09/531464 |
|
US |