RU2536612C1 - Propeller screw - Google Patents

Abstract

FIELD: transport.

SUBSTANCE: propeller screw comprises hub with blades fitted on propulsion shaft, said blades being equally spaced apart at the angle to the shaft lengthwise axis. Shell with toothed edge on the incoming water flow side is secured to top parts of said blades.

EFFECT: increased thrust.

2 cl, 3 dwg

Description

The invention relates to the field of modeling propulsors for small and large civilian vessels.

Known propeller of the vessel, containing a hub mounted on the propeller shaft with blades located at equal distances from one another at an angle to the longitudinal axis of the shaft [1]. Such a screw may have from two to six straight or curved blades. The operation of the propeller in an aqueous medium is accompanied by the occurrence of positive pressure on one side of the blade and negative pressure on the other side, as a result of which part of the water flow under the action of radially directed centrifugal forces flows over the upper edge of the blade, creating the effect of “water drilling” behind the stern of the vessel.

The objective of the invention is to increase the propeller thrust.

The technical result is achieved in that in the propeller of the vessel containing a hub mounted on a propeller shaft with blades located at equal distances from each other at an angle to the longitudinal axis of the shaft, a radially curved shell with a serrated shape on the side is attached to the upper edges of the blades incoming water flow. The shell has a flat edge on the side of the outgoing water stream.

Figure 1 shows the propeller of the vessel, a General view; figure 2 is a view of figure 1 by A; figure 3 shows a scan of the shell.

The propeller of the vessel (FIGS. 1 and 2) comprises a hub 2 mounted on the propeller shaft 1 with straight / curved blades 3 located at equal distances from one another at an angle to the longitudinal axis O of the shaft. A shell 5 is curved along the radius attached to the upper edges of the 4 blades. On the side of the incoming water stream, the shell has a serrated edge 6, and on the side of the outgoing water stream there is a flat edge 7 (Figs. 1 and 3).

A hub 2, for example, with six blades 3, is made of brass, steel, plastic by casting. A shell 5 (Fig. 3) is made of the same sheet material, having a toothed edge 6 and a smooth edge 7. The radiused collar is rolled up (soldered, welded, glued) to the upper edges of the 4 blades (figures 1 and 2). After the balancing operation, the hub with the blades and the shell is fixed on the propeller shaft 1.

When the propeller shaft rotates, the water flow rushes to the blades and then moves in the axial direction (along the O axis). The flow of water from one side of the blade to its other side through the upper edge is prevented by the shell.

The invention increases the propeller thrust by eliminating the flow of water from one side of the blade to the other through the upper edge.

The source of information

1. Polytechnical dictionary. Ch. ed. I.I. Artobolevsky - M .: Soviet Encyclopedia, 1976. - P.126 and 127.

Claims (2)

1. The propeller of the vessel, comprising a hub mounted on a propeller shaft with blades located at equal distances from each other at an angle to the longitudinal axis of the shaft, characterized in that a radially curved shell is attached to the upper edges of the blades, having a serrated shape on the incoming side water flow. 2. The propeller of the vessel according to claim 1, characterized in that the shell has a smooth edge on the side of the outgoing water stream.

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