Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Irregular – flanged or channel forming blade surface
Patent
1975-07-28
1977-01-25
Halvosa, George E. A.
Fluid reaction surfaces (i.e., impellers)
Specific blade structure
Irregular, flanged or channel forming blade surface
115 14, 416184, B63H 1104, B63H 1110
Patent
active
040045412
ABSTRACT:
A centrifugal pump for a boat which is used to propel the boat by means of a jet of water created by the pump. The pump includes a housing which is mounted exterior to the hull. A drive shaft and an impeller are mounted to rotate within the housing. The drive shaft extends through the transom of the boat and may be coupled directly to a gas turbine engine or other power generating device. The impeller is of the double suction type and includes ports for equalizing pressures on either side of the impeller at the suction positions thereof. The housing provides a double volute to receive the effluent from the impeller and direct it aft to a nozzle. Nozzle mechanisms are disclosed which provide easy steering and boat trim control under high thrust loads. A thrust reversal system is employed which directs the jet of water forward for stopping and reversing. A new scoop design is also included which reduces the possibility of air entrapment and loss of suction and increases the ram jet pressure for higher pump efficiency.
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patent: 3671138 (1972-06-01), Ball
patent: 3740162 (1973-06-01), Tuomaala
patent: 3809005 (1974-05-01), Rodler, Jr.
patent: 3935833 (1976-02-01), Onal
Goldstein Stuart M.
Halvosa George E. A.
Hydro-Tech Corporation
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