Rotary kinetic fluid motors or pumps – Working fluid passage or distributing means associated with... – Pump outlet or casing portion expands in downstream direction
Patent
1975-01-22
1976-12-14
Raduazo, Henry F.
Rotary kinetic fluid motors or pumps
Working fluid passage or distributing means associated with...
Pump outlet or casing portion expands in downstream direction
415211, F04D 2944
Patent
active
039972810
ABSTRACT:
My invention relates to centrifugal compressors, more particularly to compressors of a known type, in which air enters the compressor rotor parallel to its axis of rotation, engages an inducer portion of the compressor rotor blades which is generally helical, in which the air is accelerated tangentially, and then proceeds through an impeller portion of the rotor formed with substantially radial vanes in which the air is further accelerated tangentially, leaving the rotor periphery with a high tangential velocity. In such a compressor, the air discharged from the rotor is received in a diffuser in which the velocity head of the air is largely converted to static head by a so-called diffusion process of reducing the air velocity. The air is then directed to the outlet or outlets of the compressor. It is to be understood, however, that this invention is concerned not with the rotor but rather with the vaned portion of the diffuser.
The principle object of my invention is to increase the compressor efficiency and essentially eliminate surge problems, thereby reducing the power required to drive the compressor which results in various advantages to any machine that requires a continuous flow of high pressure air.
This objective is achieved by several features. First, by defining a method to design the shape of the leading edge of the diffuser vanes, thereby reducing the entering shock loss and also the down stream flow separation; second, by defining a method of shaping the vanes and the passage walls such that the shape will cause a suitable rate of pressure rise that will also lessen the causes of flow separation from the passageway, thereby permitting stable operation, without compressor surge, in an operating regime having a higher compressor efficiency.
REFERENCES:
patent: 1119713 (1914-12-01), Moss
patent: 2967013 (1961-01-01), Dallenbach et al.
patent: 3150823 (1963-09-01), Adams
patent: 3860360 (1975-01-01), Yu
Publication by Austin H. Church titled Centrifugal Pumps and Blowers, pp. 16-20; 118-128, copyright, 1944.
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