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1. (WO2019004841) APPARATUS AND MEANS FOR SUPPLY OF WATER TO A CULTIVATION CAGE, A NEW PUMP CONSTRUCTION AND A METHOD OF OPERATION OF THE PUMP
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C L A I M S.

1 . Device for an inlet pipe for supply of water to a net cage in a fish farming installation, where the pipe is set up to extend down into the water and comprises a pump for supply of water from the body of water to the net cage through the inlet pipe, characterised in that the inlet pipe (20a) comprises a flexible cloth-formed material which is suitable to be held suspended in a tube-form, and where the pump is arranged in the lower part of the tube-form.

2. Device according to claim 1 , characterised in that the pump is secured to the inside of the tube-formed cloth at its lower part.

3. Device according to claim 1 , characterised in that the pump (64) is fitted to a ring-formed frame section (62) which is secured to the tube-formed cloth.

4. Device according to claims 1 -3, characterised in that the pump (64) comprises a number of rotary, oblique wings/propeller blades, which by rotating about a mounting (60) can drive water from the body of water (14) and into and up through the tube-form (20a).

5. Device according to one of the preceding claims, characterised in that the pump is driven by electricity or by fluid.

6. Device according to one of the preceding claims, characterised in that the pump is fluid driven and each propeller wing comprises a longitudinally (radially extending) fluid channel that runs into a tangentially directed outlet nozzle.

7. Device according to one of the preceding claims, characterised in that the pump is connected to a pressure fluid source at the surface via a tube (69).

8. Device according to one of the preceding claims, characterised in that the pump is driven by pressurised water.

9. Device according to claims 1 -3, characterised by a flexible cloth material, in particular made of reinforced plastic, canvas, tarpaulin or the like.

10. Device according to claim 1 , characterised in that the cloth comprises a number of ring-forms (50,52) arranged at different heights in the tube-form to hold the pipe suspended/extended, and also that the weight of the pump itself contributes to hold the tube-form suspended vertically.

1 1 . Device according to claim 1 , characterised in that the cloth tube-form (20a) is suited to be pulled up to the surface for inspection and maintenance, by being folded together into a space-saving shape.

12. Installation for supply of water to net cage in fish farming installation,

characterised in that it comprises at least two inlet pipes (20a,20b) as described in claims 1 -1 1 , as the pipes are set up mutually parallel to extend down into the water.

13. Construction of a pump with an inlet and outlet and also a driving element for turning a number of tilted propeller blades to lead a fluid from the inlet to the outlet, characterised in that the pump is fluid driven and each propeller blade comprises a fluid channel (70) which runs out into one or more tangentially directed outlet nozzles.

14. Construction of a pump according to claim 13, characterised in that the propeller blades are connected to a hollow propeller casing (76) with an inlet for a pressure fluid, and the propeller casing (76) comprises openings (78) which form fluid connection to each channel (70).

15. Construction of a pump according to one of the claims 13-14, characterised in that the propeller casing (76) is connected to a propeller house (64) via vertical and horizontal bearings (80/82).

16. Construction of a pump according to the claims 12-13, characterised in that the pump is connected to a source for a pressure fluid via a tube (69) for rotation of the propeller casing.

17. Method for operation of a propeller construction, comprising a propeller casing and a number of connected propeller blades, characterised in that the propeller casing is supplied with a fluid, which when under pressure is made to flow out through each propeller blade, to then be directed tangentially with respect to the axis of rotation, so that the propellers, and thus the shaft, rotate.

18. Method according to claim 17, characterised in that water is used as the pressure fluid.

19. Method according to claims 17-18, characterised in that a propeller construction as given in claims 1 -16 is used.