SU52210A1 - A device for rotating blades of an impeller of water turbines like a Kaplan turbine - Google Patents

Description

The author's certificate No. 471919 describes a device for rotating the impeller blades of water turbines such as the Kaplan turbine, in which the pipe that covers the working shaft, which is used in such devices to drive the crank mechanism for rotating the impeller blades, is rigidly connected to the sleeve. the impeller is another pipe, receiving external radial forces and transmitting them to the bearings, in order to transfer only axial forces from the crank mechanism to the internal drive pipe.

The present proposal aims to simplify the entire mechanism for rotating the blades of an impeller of water turbines, simplify certain parts, facilitate their mechanical processing and, consequently, reduce the cost of production of water turbines as a whole, with the aim of their wide application, for example, propeller turbines impeller blades on small hydropower plants, propellers with rotary blades on steamers.

In the proposed adaptation, the longitudinal channels that provide the pipe walls associated with the impeller hub are missing, replacing the pipe of the crank mechanism for rotating the impeller blades.

In FIG. 1 shows a vertical section of a device for rotating blades of an impeller of water turbines such as a Kaplan turbine, and FIG. 2-horizontal sections of it along the line FG (left) and CE (right) of FIG. one.

A one-piece shaft (mounted in a guide bearing 72) is secured in a sleeve associated with the tube 75 by means of two keys 2, against twisting, and a nut 3, against axial shear. On the extension of the shaft 7, a disk 5 is axially moved along the shaft with the help of t g 10. The disk 5 is limited in axial movement by nuts 3 vi 4, and the key 6 holds it from turning; the movement of the disk 5 creates rotation is lost if the width h of the extreme parts of the rod and the angle of inclination of the middle part to the extreme parts of the rod are in the ratio

cos ac ft-t-2fe A is the size of the protrusion of the curved part above the extreme parts of the rod (Fig. 4).

However, if this is appropriate, cos a can be chosen as a smaller size, i.e., the value of L and the angle of inclination a are in the corresponding /.

In this service, cos,,,

 / I - 2k

In this case, the average sloping part has a width H (Fig. 3), alternating values / 7, and is about (L - f - 2 / g) cos a, i.e., part of the copper from the middle part should be cut by stamping.

However, the copper loss is very small, and the angle at the bending points should not harm the integrity of the insulation.

The subject matter of the invention.

Claims (2)

1. A conductor for electric machines with a transposition, made of several parallel rods, each of which is S-shaped with a short middle part and is bent so that both halves of this part are superimposed on one another and provided with longitudinal cuts, characterized by that pshrina / g of the extreme parts of the rod and the angle of inclination of the middle part to the extreme parts of the rod are found in the ratio cos and 2k where and is the size of the protrusion of the curved part above the extreme parts of the rod. 2. Conductor change according to claim 1, characterized in that if the value of h and the angle of inclination a are in the ratio cos ay--, then the middle oblique part has a width I less than the value of / and is about (// - | -2 / e) cos a.