Propeller

 

(57) Abstract:

Usage: in shipbuilding. The essence of the invention: of the propeller blades convex-concave profile of the helical surface of the blades is made conical, with the vertices of the cones is shifted from the root of the blade is proportional to the amount of solid angles. The invention reduces the complexity of manufacturing, so as vypolnenie the surface of the propeller blades are universal lathes, turning, milling or grinding machines. 1 C.p. f-crystals, 2 Il.

The invention relates to shipbuilding, namely the ship's propeller screws.

Known propellers with blades convex-concave profile, demanding for manufacturing advanced flexible blades, and then machining followed by molding. Thrusters are difficult to manufacture, require special machining equipment.

Closest to the proposed propeller screw is the blower blades convex-concave profile formed cylindrical over - capacities, which are easy to manufacture, but have reduced efficiency.

The invention is directed to the solution of the technical problem of increasing the efficiency grebeg what about the propeller with blades convexo-concave surface profile of the blades is made conical, thus the solid angle of the cone suction surfaces of the blades is less than the cone angle of injection, and the tops of the cones is shifted from the root of the blade is proportional to the amount of solid angles.

Due to selection of the conical surfaces can be obtained segment or aerodynamic profile of the blade. Virtualroot blades is obtained from the mismatch generatrix of the cone forming the blades.

In Fig.1 shows a propeller; Fig.2 section a-a in Fig.1.

The blade 1 of the propeller mounted on the hub 2. Internal pressure surface of the blades are made in the form of a cone 3 with base radius r1. Suction surface of the blade is also formed by a conical surface, but with a smaller solid angle, with base radius r2. As a consequence, the profile of the blade is formed by two circular arcs of radii r1and r2. The centers of the radii do not coincide, as they relate geometric dependence

r1,2l + R sin , where l is the distance between the top of the cone and the hub screws (size mismatch);

the solid angle of the cone;

the elevation angle of the helical line;

Z axis of the conical surface;

the axis of the screw surface;

R is the radius of the cross section of the screw.

1. PROPELLER with blades convex-concave profile, wherein the surface of the blades is made conical.

2. The screw under item 1, characterized in that the solid angle of the cone suction surfaces of the blades is less than the cone angle of injection, while the vertices of the cones is shifted from the root of the blade is proportional to the amount of solid angles.

 

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