RU2684337C2 - Germov propeller screw - Google Patents

Abstract

FIELD: shipbuilding.

SUBSTANCE: invention relates to shipbuilding, namely, to versions of propulsors. In three versions propeller screw comprises hub with blades. In the first version, the shape of the screw blades has the shape of pipe fragments bent around the hub at an angle to its axis. In the second version, the shape of the screw blades has the form of semi-rings bent along the spiral around the hub by the concave side towards the screw rotation side, and upper edges of blades lie on surface of imaginary cylinder with radius similar to that of propeller. In the third version, the shape of the screw blades has the shape of pipe fragments bent around the hub, and with edges parallel to the screw axis.

EFFECT: higher screw thrust.

3 cl, 16 dwg

Description

Technical field

The invention Germova rowing propeller relates to shipbuilding, where it is used as a ship propulsion, and can also be used for blades of wind generators, hydraulic turbines, domestic fans and other devices.

State of the art

Known fixed-pitch propellers of various manufacturers: progressive pitch propellers, axially radially variable pitch propellers, for example, VEEMSPORTFISH SERIES, MAP Mark-W and others (Fig. 9, 10).

A technical solution is known for the propeller of the patent of the Russian Federation under the number RU 2108265 C1 (Fig. 11). Due to the hub containing the blades of a convex-concave section with a helical surface, they are cup-shaped, in which the angle of inclination to the axis of the screw monotonously decreases with distance from the axis, while the helical surface of the blades has the shape of a parabola. The rotation of this screw allows you to increase traction due to the forced direction of the water captured by the blades along the axis of the screw. The disadvantages of this propeller are expanding scattered jets into the outer space, the additional mass of water and the attachment of flows created by centrifugal force are not fully involved, which reduces thrust efficiency.

Closest to the claimed invention is the propeller design Zemlyakova (RF №2279992). The rowing screw contains rowing plane-profile blades mounted on the hub of an axisymmetric shape, each of which is made with an end ridge (Fig. 12). Each of these end ridges is connected to the corresponding blade with the possibility of changing the fixed angle between its working surface and the working surface of this blade from 180 ° to 0 °.

Significant disadvantages of the screw is the complexity of the design and low efficiency. Does not solve the problem of end vortices.

Disclosure of invention

Invention Germov propeller is designed to solve the technical problem of increasing propeller thrust.

When the screw is operating, water is not scattered around, but is directed only in a spiral backward.

The set of essential features The characteristic features of the inventive screw are:

- the geometric shape of the blades that convert peripheral speeds into focus, the absence of overflow over the edges of the blades, the absence of end vortices (Fig. 13, 15);

- increased strength of the blades due to the spiral shape.

In the first "version" the emphasis is determined by the size of the blade. The working surface is the inner surface of the ring. Ring vanes are located around the hub in the form of thin-walled pipe fragments. Entrance and exit edges are parallel to each other.

In the second “variant”, the emphasis is determined by the dimensions of the strongly concave working surface of the blade directed in the direction of rotation and spirally twisted around the hub, as well as by the upper edge of the blade directed towards the flow of water. The upper edge of the blade divides the oncoming flow of water and directs part of it to the inner pressure surface of the blade simultaneously along the entire length of the blade. The inlet and outlet edges are perpendicular to the axis of the screw.

In the third “variant”, the emphasis is determined by the size of the blade and the location of the edges of the half ring. Working is the inner surface of the edge of the blade. The edges of the half rings of the blade are parallel and are located at an angle to the axis of the screw.

The invention is illustrated by figures 1-16:

FIG. 1 (a, b) - 3D model of a screw with annular blades;

FIG. 2 - 3D model of a screw with half-ring blades (option 2);

FIG. 3 - 3D model of a screw with half-ring blades (option 3);

FIG. 4 - drawing of a screw with annular blades (option 1);

FIG. 5 - drawing of a screw with semi-circular blades (option 2);

FIG. 6 - drawing of a screw with semi-circular blades (option 3);

FIG. 7 - a real screw with half-ring blades (option 2);

FIG. 8 - a real screw with annular blades (option 1);

FIG. 9 Rowing screw VEEMSPORTFISH SERIES;

FIG. 10 Propeller MAP Mark-W;

FIG. 11 Propeller screw patent RU 2108265 C1;

FIG. 12 Propeller design Zemlyakova (RF №2279992);

FIG. 13 End vortices of a conventional screw;

FIG. 14 Current tube of a conventional screw;

FIG. 15 Vortex formation on the propeller;

FIG. 16 Standard Tohatsu Propellers.

The implementation of the invention

The problem is solved by a special design of the shape of the blades.

In the first “variant”, the cross section of the blade has the form of a ring. The absence of overflow over the edge of the blade inside the ring creates an increased emphasis. Due to the rotation around its axis, the lateral surface of the annular blade facing the direction of rotation also “works”. It turns out two injection and two suction surfaces at one blade (Fig. 1).

In the second “variant”, the cross section of the blade has the shape of a half ring, with its concave side in the direction of rotation. The blades have a strongly concave discharge surface of constant width from root to upper edge throughout. Incoming and outgoing edges are the same. The distance between the edge and the root is equal to the diameter of the half ring. The edge of the blade is slightly elongated and lies on the surface of an imaginary cylinder with a radius like a screw. Water, shifted by the root and the end of the blade into the discharge side, is concentrated in the middle of the blade and, due to the rotation of the screw surface of the blade, is directed along the axis without overflow over the edge of the blade, as if it was moving in a pipe in a spiral (Fig. 2).

In the third “variant”, the semicircular blade is located on the hub so that its edges are inclined at an angle of attack and lie on the hub along the axis of the screw, and the semicircle is connected to the top of the blade edge. The plane of the input and output edges pass through the axis of the screw (Fig. 3).

The propeller operates as follows.

When the screw rotates around its axis, moving along the vessel, the water flow displaces in a spiral backward. FIG. 14, 15 explain the formation of free vortices on ordinary screws.

In the first "variant", the flow of water is captured by the inner part of the blade ring, creating a current tube. The ring prevents water from forming end vortices. The ring vanes are located at an angle of attack around the hub in the form of thin-walled pipe fragments twisted in a spiral around the hub (Fig. 1).

In the second “variant”, when the screw rotates, the upper edge of the blade simultaneously displaces the entire trapped volume of water toward the middle of the blade and back along the axis of rotation to create a stop. This form prevents overflow of water flow over the edge of the blade and the formation of free vortices (Fig. 2).

In the third “variant”, the current tube is created by a half-ring of the blade. The design of the blade allows you to increase the diameter of the screw without increasing the width of the half ring (Fig. 3).

Prototypes were made (Fig. 5, 6). Comparative sea trials of standard screws (Fig. 16) and claimed. The inventive screws increase in speed ranged from 20 to 40% with an equal number of revolutions.

"Options" 1 and 3 have the same traction back and forth. The shape of the blades helps the screw to keep its direction under water (vertical stability).

The technical and economic advantage of the inventive propeller is to increase the emphasis and increase the speed of ships at the same engine power values, reduce fuel consumption.

It can be made by injection molding, on press and welding equipment, on multi-axis machine equipment.

Claims (3)

1. A rowing screw containing a hub with blades, characterized in that the shape of the blades has the form of pipe fragments, bent around the hub at an angle to its axis. 2. A rowing screw containing a hub with blades, characterized in that the shape of the blades has the form of half rings bent in a spiral around the hub with the concave side in the direction of rotation of the screw, and the upper edges of the blades lie on the surface of an imaginary cylinder with a radius, like a screw. 3. A rowing screw containing a hub with blades, characterized in that the shape of the blades has the form of pipe fragments, bent around the hub, and the edges parallel to the axis of the screw.

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