US1118361A - Wheel for elastic-fluid turbines. - Google Patents

Description

O. LASCHE. WHEEL FOR ELASTIC FLUID TURBINES. APPLICATION FILED JUNE 19, 1914.

Patented Nov. 24, 1914.

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OSCAR LASCHE, OF

STATES PATENT oF- Be it known that I, OSCAR LASCHE, a subject of the'Emperor of Germany, residing at Charlottenburg, Germany, have invented certain new and useful Im rovements in Wheels for Elastic-Fluid Tur ine's,of which the following is a specification.

The present invention relates to bucket or vane-wheels for elastic-fluid turbines, and particularly to those having a plurality of rows of buckets or vanes.

The object of the invention is to provide a structure which can be constructed at a low cost, which can be readily assembled, and which, while using and embodying the advantages of the undercut groove for olding the buckets, avoids the difficulties in constructing and assembling which have heretofore been met with.

For a consideration of what I believe to be novel and my invention, attention is directed to the following specification and to the claims appended thereto. 0

In the accompanying drawing, Figures 1 to 4: illustrate in section four forms which my invention may take, a three row combination being illustrated in each instance.

In carrying out my invention I form the bucket or vane carrying wheel of a plurality of disks in the sides of which adjacent the peripheries are formed annular grooves or slots. These grooves or slots are so formed that when the disks are assembled side by side they codperate to form undercut slots for the reception of the bucket or vane bases. Owing to this construction the grooves can be much more easily formed. For example, they can be formed by turning in a lathe. The assembling of the bucket bases in the Wheel is also much more simple as the buckets and the usual spacing pieces can be inserted before the disks are assembled and fastened together. This avoids the use of the usual lateral openings through which the bucket bases are inserted into the groove and also the use of special locking buckets.

In the drawing the arrangement shown in each of the figures is broadly the same and the same reference numerals will accord in ly be-used for corresponding parts.

Iteferring to the figures of the drawing, 5 is the rotor shaft which carries the bucket wheel. In the examples illustrated three row or ring bucket wheel combinations are WHEEL FOR ELASTIC-FLUID TURBINES.

. Specification of Letters Patent.

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Patented Nov. 24, 1914.

Application filed June 19, 1914. Serial No. 846,149.

shown each comprising the intermediate however, that other than three ringcombi nations may be constructed.

In Fig. 1 the members 6 and 7 are shown as flat disks of uniform thickness extending down to the shaft and provided on both sides with annular grooves 10 and upon the outer side with grooves 11. The outer members 8 and 9 are in the form of annular rings and have grooves 12 and annular projections 13. When assembled the grooves 10 coiiperate with each other and with grooves 12 to form the undercut slots for the reception of the bases of the buckets 14. The projections 13 enter the grooves 11 to form a rigid structure when assembled. The wheel is shown as fastened to the shaft by means of the tapered sleeves 15 and nuts 16. The disks 6, 7, 8 and 9 may be fastened firmly together by means of suitably spaced rivets or bolts 17. The specific arrangement shown in Fig. 1 has the advantage that the disk members 6 and 7 may be formed from rolled stock and require little machine work. The members 8 and 9 are formed as annular rings in order to lighten the structure of the wheel as a whole.

In the arrangement shown in Fig. 2, both the intermediate and outer disk members extend down to the shaft and the same are formed with thick bases 18 and thinner web portions 19 to lighten the structure. These web portions terminate at their peripheries in thickened projections 20 which cooperate to form the undercut grooves for holding the buckets.

The arrangement of Fig. 3 is similar to that of Fig. 2 in that each of the disk members extend down to the shaft. In this figure the members 6 and 7 are formed on one side with flat cotiperating faces as indicated at 21, which permit of a somewhat lighter structure, as will be obvious. The undercut slots are also of a somewhat different design.

The arrangement of Fig. 4 is quite similar to that of Fig. 2 differing therefrom mainly in the specific form of the undercut slots and by the provision of a spacing ring or member 22 between the intermediate members 6 and 7.

In Figs. 3 and 4 is illustrated an alternative method of fastening the disks of the mas er wheel to each other and the wheel to the shaft, the disks being fastened together by means of rivets or bolts 23 located adjacent the shaft and shrunk and keyed to the shaft as indicated at 24.

In connection with each of the structures illustrated, it will be clear that the grooves for forming the undercut slots can be readily formed as already set forth and that buckets can be readily inserted in place and the wheel assembled. The buckets or vanes may be provided with covers 25 at their outer ends if desired.

In accordance with the provisions of the patent statutes, 1 have described the principle of operation of my invention, together with the apparatus which I now consider to represent the best embodiment thereof; but I desire to have it understood that the apparatusshown is only illustrative, and that the invention can be carried out by other means.

What I claim as new and desire to secure by Letters Patent of the United States, is,-

l. A turbine rotor comprising a plurality of intermediate disk members having grooves in their opposite faces adjacent their peripheries, two outer disk members each having a groove in one face and a plurality of rings of buckets held between said disks with their bases seated in the grooves.

2. In a turbine, a bucket wheel comprising intermediate and outer disk members, the peripheries of which are spaced apart, grooves formed in the adjacent faces of said members to form undercut slots, buckets held between said disk members with their bases in the undercut slots, and. means for fastening said disk members together.

3. In a turbine, a shaft, a bucket wheel comprising a plurality of intermediate and. a plurality of outer disk members which extend down to the shaft and have grooves formed adjacent their peri heries which 00- operate to form undercut s ots, buckets held between said members with their bases in said grooves, means for fastening said disk members together, and means for fastening the wheel to the shaft.

4. In a turbine, a shaft, a bucket wheel comprising intermediate and outer disk members having grooves formed adjacent their peripheries which coiiperate to form undercut slots, buckets held between said members with their bases in said slots, holding means adjacent the shaft for fastening said disks together, and means for fastening the wheel to the shaft.

5. In a turbine, a shaft, a bucket wheel comprising intermediate and outer disk members which extend down to the shaft and have grooves formed adjacent their peripheries, which grooves coiiperate to form undercut slots when the disk members are assembled, and buckets held between said members with their bases in said grooves.

' In witness whereof, I have hereunto set my hand this fourth day of June, 1914.

osoan rascals;

Witnessess Enron UBERLEE, Oscar EBERTH.

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