Rotary kinetic fluid motors or pumps – Working fluid passage or distributing means associated with... – Vane or deflector
Patent
1990-10-02
1993-01-12
Look, Edward K.
Rotary kinetic fluid motors or pumps
Working fluid passage or distributing means associated with...
Vane or deflector
4152112, F04D 2930
Patent
active
051785161
ABSTRACT:
A centrifugal compressor has diffusers which convert a high velocity, low pressure stream of fluid which flows out of an impeller to a high-velocity high-pressure flow due to the action of a purality of stator blades disposed near the outer periphery of the impeller. In this compressor, the portion of the stator blade or of an auxiliary blade which is provided in the diffuser located on the side of a front shroud is disposed closer to the impeller than the portion thereof located on the side of a main shroud, and the leading edge of the stator blade is thus inclined from the portion thereof located on the side of the main shroud to the portion thereof located on the side of the front shroud. The configuration of the front edge of a stator blade or of an auxiliary blade which is provided in the diffuser is so improved as to restrict back flow which occurs on the side of the front shroud when the flow rate is small and to lower the minimum flow rate. Furthermore, an auxiliary blade and an intermediate blade are disposed between the adjacent stator blades, and the leading edge of the auxiliary blade is so improved as to enlarge the operation range of the diffuser and to improve volume control greatly.
REFERENCES:
patent: 2967013 (1961-01-01), Dallenbach
patent: 3356289 (1967-12-01), Plotkowiak
patent: 3781128 (1973-12-01), Bandukwalla
patent: 3918829 (1975-11-01), Korzec
patent: 4349314 (1982-09-01), Erwin
patent: 4395197 (1983-07-01), Yoshinaga
patent: 4877370 (1989-10-01), Nakagawa
patent: 4902200 (1990-02-01), Bandukwalla
Abe Yoshiaki
Kaneko Junichi
Nakagawa Koji
Sakai Haruki
Takagi Takeo
Hitachi , Ltd.
Larson James A.
Look Edward K.
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