Jet boat pump
US4004541A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 28, 1975 |
| Grant date | Jan 25, 1977 |
| Priority date | — |
| Expiry date | Jul 28, 1995 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04D29/445
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.