Fluid reaction surfaces (i.e. – impellers) – Rotor having flow confining or deflecting web – shroud or... – Axially extending shroud ring or casing
Patent
1994-09-19
1996-03-12
Look, Edward K.
Fluid reaction surfaces (i.e., impellers)
Rotor having flow confining or deflecting web, shroud or...
Axially extending shroud ring or casing
416191, 416193R, 416196R, F01D 522, F01D 524
Patent
active
054981360
ABSTRACT:
The total number (M) of plural blades of a blade apparatus is selected so as not to be a prime number and not to be a power multiplier of a prime number. Plural blades are divided into at least a first blade group in which one blade group has the blades of a first integer number (N.sub.1) and a second blade group in which one blade group has blades of a second integer number (N.sub.2). Each of the first integer number (N.sub.1) and the second integer number (N.sub.2) have no common divisor except 1. The total number (M) of plural blades is the product of the first integer number (N.sub.1) and the second integer number (N.sub.2). The blades of the first integer number (N.sub.1) blade group are connected by a first stage connecting member and the blades of the second integer number (N.sub.2) blade group are connected by a second stage connecting member.
REFERENCES:
patent: 3584971 (1971-06-01), Ortolano
patent: 3588278 (1971-06-01), Ortolano et al.
patent: 4662824 (1987-05-01), Ortolano
Ikeuchi Kazuo
Namura Kiyoshi
Saito Eiji
Takasumi Masakazu
Hitachi , Ltd.
Larson James A.
Look Edward K.
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