RU1789419C - Screw propeller - Google Patents

Abstract

The use relates to shipbuilding, namely the construction of propellers. The inventive propeller contains a hub 1 with blades 2 mounted at an angle of attack equal to 50-60 °, and connected by a retaining ring 3, on the outer surface of which are installed at an angle of attack equal to 35-40 °, peripheral blades 4 associated with the peripheral retaining ring 5. The number of peripheral blades 4 is twice the number of blades 2, and the retaining and peripheral retaining rings are conical with a taper angle of 1 ° and 3-5 °. 2 ill.

Description

Foie1

The invention relates to the field of shipbuilding, in particular to propellers.

Known propeller containing a hub with blades, the end parts of which are connected to the retaining ring,

However, such a propeller has low efficiency.

A propeller is known that contains a joint with blades, the ends of which are connected by a retaining ring and peripheral flanges secured on the outer surface of the retaining ring, as well as a peripheral retaining ring connected to the peripheral blades, while the retaining rings are conical.

This technical solution was adopted for the prototype.

The disadvantage of such a screw is its relatively low efficiency.

The purpose of the invention is to increase efficiency.

In order to achieve the object of the invention, in a propeller comprising a hub with vanes whose ends are connected by a retaining ring, and peripheral vanes fixed to the outer surface of the retainer ring, as well as a peripheral retaining ring associated with the peripheral vanes, the number of peripheral vanes is twice more than the number of hub blades, the length of the retaining ring is 0.6 the length of the peripheral retaining ring, while the retaining and peripheral retaining rings are made

conical with a taper angle equal to .1 ° and 3-5 °, respectively, and the angles of attack of the hub blades are 50-60 °, and the angles of attack of the peripheral blades are 35-40 °.

On Fig, 1 shows a propeller, a side view in section; in FIG. 2 - the same, front view, section.

The propeller contains a hub 1 with blades 2, the ends of which are connected by a retaining ring 3. On the outer surface of the retaining ring 3, peripheral blades 4 are installed, the number of which twice exceeds the number of blades 2 of the hub 1. The peripheral blades 4 are connected by a peripheral retaining ring 5.

The retaining ring 3 and the peripheral retaining ring 5 are conical with taper angles of 1 ° and 3-5 °, respectively, while the length of the retaining ring 3 is 0.6 the length of the peripheral retaining ring 5. The angles of attack of the blades .2 hubs 1 are 50-60 °, and the angles of attack of the peripheral blades 4 are 35-40 °.

When the propeller rotates, due to the angles of the taper of the retaining rings, a flow loggia occurs, which together with the indicated geometric elements of the propeller improves

its propulsive and cavitational characteristics, thereby increasing the efficiency, which is the technical and economic effect of the invention.

Claims (1)

SUMMARY OF THE INVENTION A rowing screw comprising a hub with vanes whose ends are connected by a retaining ring and peripheral vanes fixed to the outer surface of the retaining ring, as well as a peripheral retaining ring associated with the peripheral vanes, the retaining rings being conical, characterized in that that, in order to increase efficiency, the number of peripheral blades in two times the number of blades of the step. The length of the retaining ring is 0.6 perimeter of the peripheral retaining ring, and the taper angles of the retaining and peripheral retaining rings are 1 ° and 3-5 °, respectively, when the angle of attack of the hub vanes is 50-60 °, and the angle of attack of the peripheral 4 $ blades equal to 35-40 °.