Kamewa Ab

Other

Kjell Haglund

A propeller assembly (2), a so-called thruster, intended to be fitted to an opening (7) in a bottom part (1) of the shell structure of a watercraft, for example an offshore-platform, is provided with a mounting flange (9) which can be connected in a pressure tight fashion to the shell structure around the opening (7). To enable the assembly to be fitted and dismantled from outside the shell structure and beneath the surface of the water on which the craft floats without requiring the assistance of a diver there are used a plurality of lines (12) which can be connected to lifting devices in the watercraft and passed out through a corresponding number of line openings (13) located in the shell structure on one side of the assembly mounting opening (7), so that the ends of the lines can be connected to the line attachments (16; 37) on the assembly (2). These line attachments (16; 37) are so arranged on the mounting flange (9) of the assembly (2) that when the assembly is mounted and the mounting flange (9) connected to the shell structure (1) they are located in the line openings (13) and are accessible from inside the shell structure (1), thereby enabling the lines (12) and the line attachments (16; 37) to be mutually connected from inside the watercraft. The line attachments (16; 37) are provided with seal apparatus (18; 38) which, when the propeller assembly is mounted in position, close the line openings (13), while on the inside of the shell structure (1) adjacent each line opening (13) there is provided a sealing chamber (14,20; 47a, 47b) which surrounds the line opening and which is provided with a sealing lead-through for the line (12).

Arrangement for fitting a propeller assembly to an opening in a bottom

The invention relates to a reversing means in a marine-water-jet propulsion unit, which includes a pump (4) having connected thereto a nozzle tube (14) for directing the driving jet of water. The lower wall (14a) of the tube is provided with an opening (16), and the reversing means includes an inner flap (17) and an outer flap (18) arranged to close the opening from the inside and the outside respectively of the tube. The inner flap (17) can be swung about its fore end, as seen in the direction of flow of water through the tube, between the closed position and a position in which it is swung inwardly in the tube (14), in which position the flap (17) completely or partially blocks the flow path through the tube and deflects the water flow completely or partially out through the opening (16) in the wall of the tube. The outer flap (18) can also be swung about its fore end, as seen in the direction of flow of water through the tube, between the closed position and a position in which the flap is swung outwardly from the tube and in which the flap is directed obliquely downwardly and rearwardly, as seen in the direction of flow of water through the tube. When the outer flap occupies this open position, it directs the stream of water exiting through the opening (16) in the tube wall obliquely downwardly and rearwardly relative to the direction of flow of water through the tube. The two flaps (17, 18) have a common operating means (19, 24) for simultaneous pivoting of the flaps between their closed position and their open position (FIG. 1).

Reversing means in water-jet propulsion units

A water jet unit for ships, comprises a propeller pump having a pump housing connected on its inlet side with an inlet channel and on its outlet side with a water-jet directing outlet means. The pump housing has a hub housing which is arranged centrally in the flow path of the water through the pump housing and which is carried by guide vanes extending radially between the wall of the pump housing and the hub housing. The impeller is mounted on the end of a pump shaft extending into the pump housing through the inlet channel and is journalled in the hub housing by means of an axial bearing and a radial bearing. Both bearings are spherical and have a substantially common center.

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Karlstad, Sweden

Kjell Haglund