Patent GB-190513893-A (GB)
Title: Improvements in Turbines.
Inventor: RECKE OSCAR
Filed: 1905-07-05
Granted: 1905-11-23
Abstract: 13,893. Recke, O. July 5. Elastic-fluid turbines.-To avoid loss of energy produced by the centrifugal pressure of the power medium in turbines, the blades are so shaped that the profile of the steam &c. passage varies from the rectangle g, h, k<4>, i<4>, Fig. 5, at the outer ends to the shape g, h, k, i at the centre or concave part. The shapes g, h, k<1>, i<1>, &c. represent the section at intermediate points. The side g, h is, in each case, on the inner face of the passage. Fig. 7 shows the longitudinal profile of the blades on the lines I ... V of Fig. 6. In Figs. 8,9,10, 11, and 11 are shown various practical forms which the blades may take, the shaded lines representing the actual profile, and the dotted lines the theoretical profile to be approximated to. Figs. 12 and 13 show other forms which are designed to be produced by means of grinding- wheels z capable of rotation on an axis y through about thirty degrees to left and right. The wheels are of double conical form with a spherical , central part. The rectangle g, h, k<4>, i<4>, of Fig. 5, is replaced by the curved figure g, h, k<1>, i<1>, Figs. 12 and 13, and straight lines are chosen to approximate to the theoretical curve. In order that the blades may be produced by three cuts of the tool, the height h, Fig. 14, must not be less than H/3, and to meet this condition the width B, Fig, 16, at the centre of the passage may be smaller than the width B<1> at the ends, thus allowing the height h to be increased. The curves r, Fig. 15, to be followed by the passages are sine curvee, and, as shown in Fig. 21, a similar sine curve forms the basis of all the guide and rotating blades. The shapes of the blades and passages are shown in Fig. 22, the two curves 7, 8 being those employed in all the blades. By displacing these curves both vertically and horizontally, they are made to suit all the blades. In Fig. 23, the curve 8<1> is shown in position for the first wheel, and the curve 8 in position for the last wheel. The nozzles which conduct the steam to the first wheel may be constructed on similar principles, as shown in Figs. 17, 18, and 19. The enlargement ceases near the mouth u, which is so constructed as to discharge the steam or other fluid in a parallel jet. To allow for the compression of the fluid at the curved parts of the nozzle, these parts are narrowed as shown in Fig. 19, which is a section at C-C of Fig. 17. The height h at the entrance should be greater than H/3, where H is the width at the discharge end, in order that not more than three cuts of the tool are required in making the nozzle. 13,926. Hewitt, P. C. July 6. Roots'-blower type of rotary pumps. The primary object of the pump is to supply lubricating- material to a number of bearings &c. in such quantities as may be necessary. The pump may, however, be used to supply other liquids and for other purposes. It is built up of sections a, a, a<2> &c., Fig. 2, each of which has a separate delivery pipe, while all may have a common suction pipe. Each section consists of an approximately-ellipiical casting b, provided with circular openings c, cl, an inlet port d and an outlet port e leading to a pipe h. One face has a roughly-elliptical recess f which receives the two rotors g, g<1>. The capacity of each section is determined by the width of the faces of its gears and the corresponding depth of the chamber f. Long bolts j, passing through holes i, hold the sections together. End-plates at each end of the complete pump may be employed. A worm-wheel o on a feathered shaft m drives one set of wheels. The shaft m may only extend into one wheel g and the other wheels are driven by teeth in their hubs as shown in Fig. 6. The pump may be supported by brackets as shown.