US 1466324 A
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Description (OCR text may contain errors)
Aug. 28, 1923. `1,466,324
. J. WILKINSON ELASTIC vFLUID TURBINE Filed June 7. 1922 Inventor: JamesWl Kl nsorv,
Patented A ug. 28, 1923.
UNITED STATES 1,466,324 PATENT OFFICE.
JAMES WILKINSON, OF LYNN, MASSACHUSETTS, ASSIGNOR TO GENERAL ELECTRIC COMPANY, .A CORPORATION OF NEW YORK.
ELASTIC-FLUID TURBIN E.
' Application led June 7, 192.2. Serial No. 566,631.
To aZZ/wlwm z't may concern:
'Be it known that I, JAMES WILKINSON, a citizen of the United States, residing at Lynn, in the county of Essex, State of Massachusetts, -havejnvented certain new and useful Improvements in Elastlc-Fluid Turbines, of .which...the following is a speciication.
The present invention relates to elastic fluid turbines and has for its object to provide an improved structure and arrangement for attaching the blades or buckets to the carrying member such as a turbine wheel.
For a consideration of what I believe to be novel and my invention, attention is directed to the accompanying description and the claims appended thereto.
In the drawing, Fig. 1 is a perspective view of a section of a bucket ring embodying my invention; Fig. 2 is a perspective view of a portion of a carrying member, and Fig. 3 is a radial sectional view of a completed structure. I
Referring to the drawing, 5 indicates ,a carrying member, here shown in the form of a wheel adapted to be fastened to a turbine shaft and carrying on its periphery a ring of turbine buckets or blades. 6.
According to my invention I provide the carrying member with an annular slot 7 of suitable width and depth and in the opposed side walls of slot 7 I provide annular grooves 8 and 8a which are located a suitable distance from the top of slot 7 Communicating with grooves 8 and 8a respectively are radially extending passages 9 and 9a which are staggered with respect to each other. Passages 9 and 9 are preferably spaced apart a distance equal to their length. There are thus provided at the entrance end or top of slot 7, a series of equally spaced staggered projections 10 and 10a. In the walls of slot 7 are holes 11 adapted to receive fastening pins or rivets-12. t
The bucket or blade ring comprises a number of arcuate bucket groups or sections of suitable length. One of these groups or sections is shown in Fi 1. It comprises a number of buckets or b ades 6 carried by a base 13. Base 13 has a| web portion 14 of dimensions to t slot 7 and on opposite sides of web portion 14 are spaced projections 15 and 15a which are arranged in staggered relation to 'leach other and are of a size and length to pass through grooves 9vand 9 and fit grooves 8 and 8a. The projections 15 are seen only in Fig. 3, but it will be understood Y that they are exactly like projections 15, Fig. 1, and are arranged in the same manner except that they are staggered with respect to them. In web portion 14 are holes 16 which stand in line with holes 11. Bucket or blade ring groups or sections as shown in Fig. 1 may be formed in any suitable manner. For example, they may be formed from buckets or blades and spacing blocks assembled in correct relation to eachv other and then permanently united by fusion circumferentially to bring projections 15 and 15a under projections 10 and 10, grooves 8 and 8a being of dimensions to just receive projections 15 and 15a. Pins or rivets 12 are then inserted to further fasten the bucket groups to the carrying member.
By the above described arrangement the buckets are assembled on the carrying member by inserting them radially which from a manufacturing standpoint possesses advantage over the usual method of passing the buckets through a lling slot and then sliding them around the wheel. At the same time the buckets are held in position by both interlocking shoulders and pins. Since the interlocking shoulders are practically continuous, all the bucket parts are held from radial displacement so that should any buckets of a group become loose it is still held from radial dis lacement.
Fastening the buc ets in place by both interlocking shoulders and pins is of advantage in that it gives a firm, strong anchorinof of the buckets in which the stresses are weil distributed so that the rim of the wheel may be made comparatively small, this latter being an important consideration in reducing the centrifugal stresses.
In accordance with the provisions of the Patent Statutes, I have described the principle of operation of my invention, together with vthe apparatus which I now consider to Ill .representthe best embodiment thereof, but
ll desire to have it understood that Athe .apparatus shown is only illustrative and that the invention'may" be carriedy out by other means.
What l claim as new and desire to secure lby Letters Patent of the United Statesis are adaptedl to pass through said staggeredVrrv ...passages and be brought into said grofves by a sliding movement.
2. ln an elastic Huid turbine, a carrying member having an annular slot, grooves in the opposed faces of said slot, and staggered passages communicating with said grooves, and a bucket group having a Web which ts Maase@ the annular slot in the carrying member, staggered projections on said web which are adapted to pass throughsaid staggered passages and be brought into said grooves by a sliding movement, and pins for fastening the Web in the slot. j
'3. In ari-elastic Huid turbine, a carrying member having an annular slot, grooves in the opposed faces of the slot, and staggered passages communicating With said grooves, arcuate bucket groups having Webs which fit the annular slot in the carrying member, and staggered projections on the Webs which are adapted to 'passthrongh said staggered passages "andwt said grooves, said bucket groups, being adapted to be all assembled on the carrying member by being inserted'` into the slot and then fastened therein by being slid circumferentially.
lln witness whereof, ll have hereunto set my hand this 3rd day of June, 1922.