Pumps – Gas pressure exchange using rotary cellular conveyor
Patent
1975-01-15
1978-10-31
Freeh, William L.
Pumps
Gas pressure exchange using rotary cellular conveyor
F04B 1100
Patent
active
041232003
ABSTRACT:
A gas-dynamic pressure-wave machine comprises essentially a celled rotor operating within a stationary casing that includes a cylindrical middle portion co-extensive in length with the rotor and two side casing portions located respectively adjacent opposite ends of the rotor for entrance and discharge of a hot high-pressure gas and a cold gas respectively which flow through the cells, some of the energy in the hot high-pressure gas being imparted to the cold gas so as to cause the latter to be compressed as a result of the pressure-wave process which takes place within the cells. The rotor becomes heated by the hot gas to an operating temperature between those of the cold gas, to be compressed, e.g. air and the hot gas, e.g. engine exhaust gas causing it to expand in an axial direction. In order to prevent any rubbing action between the surfaces of the two side casing portions and the opposite ends of the rotor and yet maintain a desirable small operating axial clearance therebetween, the middle portion of the casing, for each duty point of the machine, is heated approximately simultaneously with the rotor to a temperature which is at least approximately proportional to the average rotor temperature at that duty point. The required heating of the middle portion of the casing is accomplished by passing some of the hot gas through a channel formed between the periphery of the rotor and the adjacent inner surface of the middle casing portion and/or through a channel formed between the outer surface of the middle casing portion and a jacket surrounding the latter.
REFERENCES:
patent: 2004777 (1935-06-01), Bassler
patent: 2836346 (1958-05-01), Vendrassik
patent: 3291379 (1966-12-01), Herger et al.
patent: 3591313 (1971-07-01), Wunsch
Horler Hansulrich
Perevuznik Josef
BBC Brown Boveri & Company Limited
Freeh William L.
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