RU1770213C - Water-jet propeller - Google Patents

Abstract

Usage: shipbuilding. SUMMARY OF THE INVENTION: a water-jet propulsion device has a housing 1 and an impeller 2 mounted on a shaft 3 in bearings integrated in covers. The outlet nozzle 7 is connected to the nozzle by means of brackets and a hub 8, which is mounted on a shaft 9 installed in the sleeve 10 and rotates the nozzle 7, while the axis of the shaft 9 coincides with the axis of the drain nozzle. The water inlet pipe 6 is blocked by a grill 12, which is fixed on the lower cut of the nozzle 7 in the bottom of the vessel. 3 ill.

Description

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The invention relates to shipbuilding, in particular to jet propulsion of ships and boats, mainly with a flat bottom.

Closest to the invention is a water-jet propulsion device containing a centrifugal pump with a horizontal axis of rotation of the impeller, a drain pipe made in a scroll of the pump housing, a water pipe with an inlet grille and an outlet nozzle (US patent Ms 4031844, class B 63 H 11 / 02, 1977).

The disadvantages of this design include the inability to rotate the output nozzle relative to the vertical axis, which impairs the maneuverability of the vessel and increases hydraulic losses in the propulsion hull.

The aim of the invention is to increase the operational characteristics of the propulsor by installing a rotatable outlet nozzle, rotatable 360 °, and reducing the length of the drain pipe.

This goal is achieved in that in a water-jet propulsion device comprising a centrifugal pump with a horizontal axis of rotation of the impeller, a drain pipe made in a scroll of the pump casing, a water pipe with an inlet grate and an outlet nozzle, the latter being rotatable with respect to the vertical axis. and the inlet grille is fixedly mounted on the end part of the specified nozzle with the location of the nozzle outlet in the plane of the inlet grill in its peripheral part, the axis of the nozzle being placed at an angle to the surface of the grill and the drainage pipe is located inside the water pipe,

Figure 1 shows the proposed mover, a longitudinal section; figure 2-section aa in figure 1; in Fig.3 - the inlet part of the underwater pipe,

The water-jet propulsion device comprises a double suction centrifugal pump having a housing and an impeller 2, which is mounted on the shaft 3. The shaft 3 rotates in bearings 4, which are inserted into the covers 5. There are water channels in the covers 5. The housing 1 from the side of the drain pipe goes into the water pipe 6, the output nozzle 7 is connected to the drain pipe using brackets and a hub 8, which is mounted on the shaft 9. The shaft 9, mounted in the sleeve 10 and bearings 11, rotates the nozzle 7. Axis the shaft 9 coincides with the axis of the drain pipe. The water inlet pipe 6 is blocked by a grill 12, which is fixedly mounted on the lower cut of the nozzle 7 flush with the bottom of the vessel. Water pipe 6 is installed on the bottom of the vessel.

The arrows show the path of water in the mover.

Water jet propulsion operates as follows. The rotation of the shaft of the drive motor (not shown) is transmitted to the worker

wheel 2. Seawater through the inlet 12 is sucked into the water supply pipe 6, from it is sent to the impeller 2 and, passing through the wheel 2, is pumped into the spiral housing 1. Passage through

spiral hull, the flow through the nozzle 7 is ejected under the bottom of the vessel at a certain angle, creating a useful thrust.

360 ° turn of the bend is carried out by turning the shaft 9, on which the nozzle 7 is mounted together with the inlet grate 12. The grate 12 separates the flow of water leaving the nozzle with the flow of water entering the water inlet, it also protects the water jet mover from getting into it

foreign objects.

The technical and economic effect of applying the proposed technical solution is possible by increasing the maneuverability of the vessel by installing a rotary nozzle.

In addition, a reduction in the length of the drainage nozzle makes it possible to reduce hydraulic losses in the jet propulsion device and to reduce weight and dimensions.

Claims (1)

The claims A jet propulsion device comprising a centrifugal pump with a horizontal axis of rotation of the impeller, a drainage pipe made in a cochlea of the pump casing, a water inlet pipe with an inlet grate and an outlet nozzle, characterized in that, in order to improve the operational characteristics of the propulsor, the outlet nozzle is made rotatable with respect to the vertical axis, and the inlet grate is fixedly mounted on the end part of the said nozzle with the nozzle outlet located in the plane of the inlet grate in its peripheral part, and the drainage pipe is located inside the water supply pipe. u - D ll L l l and d and ::. 3