초록 ▼

For improving characteristic uprising at the right-hand side of head-flow rate characteristic of a turbo machine, as well as for suppressing increase of vibration and/or noises thereof, a plurality of first grooves 24 in direction of gradient in pressure of fluid are formed on an inner flow surface

For improving characteristic uprising at the right-hand side of head-flow rate characteristic of a turbo machine, as well as for suppressing increase of vibration and/or noises thereof, a plurality of first grooves 24 in direction of gradient in pressure of fluid are formed on an inner flow surface of a casing, for connecting an inlet side of blades of an impeller and an area on the inner flow surface of the casing where the impeller blades reside in, over an inner circumference of the casing. Also, second grooves 25 in a circumferential direction are formed in an area on the inner flow surface of the casing where the impeller blades reside in, for communicating the first grooves in the circumferential direction of the casing.

대표청구항 ▼

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

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.