US 886515 A
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Description (OCR text may contain errors)
1 No. 886,515. PATENTED MAY 5, 1908.
A JUDE TURBINE. APPLICATION FILED, OUT. 3,1906.
2 SHEETS-SHEET 2.
WIT/VESSZ'S UNITED STATES PATENT ()FFICE.
ALEXANDER JUDE, OF BIRMINGHAM, ENGLAND, ASSIGNOR. TO BELLISS & MORAOM LIMITED,
' OF BIRMINGHAM, ENGLAND.
TURBINE Specification of Letters Patent.
Patented May v5, 1908.
Application filed October 3, 1906. Serial No. 337,253.
To all whom it may concern:
Be it known that I, ALEXANDERJUDE, subj ect of the King of Great Britain, residing at Ledsam Street Works, Birmingham, county of Warwick, England, have invented new and useful Improvements in Turbines, of which the following is a specification.
This invention relates to improvements in the construction of guide-blades and vanes and to means for assembling them in and securing them to the stators and rotors respectively of turbine motors.
' According to one form of construction the guide-blades or vanes or securing or filling blocks or both are formed with one or more deformable fangs, preferably inpairs, constitutin a bifurcation, which, in the assembly ofthe parts, are distorted by being forced into the under-cut portions of a ringgroove turned in the internal surface of the stator or the external surface of the rotor respectively, the space within the rin -groove being thereby completely filled and tie guide blades or vanes secured therein by a clench ing operation.
Various modifications of detail may be adoptedfor effecting the secure attachment by the clenching operation above described, as for example, the section of the oove may be adapted to efiect the spreading of the fangs by means of a central ridge at the bot tom of the groove or, alternatively, the spreader may be a longitudinal rod which is inserted in the groove preparatory to assembling and clenching. Again this separately made longitudinal spreader may be notched and thereby perform the further function of determining the pitch. For large blades and vanes two bifurcations may be rovided on each, on the other hand a sin e fang may be used..
he various forms'of construction referred to above are illustrated in Figures 1-22. Referring to the first portion of the invention, Figs. '1-5 show the details of the construction and assembly of guide blades and vanes which are formed with a bifurcation. According to these. figures a strip of metal of section suitable to form a guide-blade or vane a as shown in Fig. 3, is stamped or machined to a shape such as is indicated in Figs. 1 and 2, the breadth of the portion a, which forms the shank-of the vane, being lessened by the removal of the thin edges and a notch a being formed in the extremity of the shank. At the other end of the piece a, a lug a is formed for the purpose of making a riveted attachment to the shrouding, in the usual way. The groove 11 into which the shank a is intended tobe inserted has a transverse section as shown in Figs. 1 and 5, therebeing a ridge b left in the center of the bottom of the groove by turning a-deep and narrow groove b on each side thereof.
If a guide-blade or vane formed as described is forced or driven into the groove until the shouldersa a, come incontact with the surface of the stator or rotor, as shown in Fig. 5, the fangs a a will be splayed-into the undercut side grooves b? 'b? and thus clench the connection. Between-the guide-blades or vanes a fillin or distance'piece, whose section has a profile like that of the shank a as shownby c in Fig. 4,, can be similarly clenched. These fillin ordistance pieces may have flat ends as s own by c (Fig. 4
or they maybe curvedto the-form. of the front and back faces of the shank aas shown by c (Fig. 4 I
In Fig. 6 a modified form of construction is shownm which, for theridge b is-substituted a rod (1 which will serve to spread the fangs a a; into the undercut sides of the groove b and similarly clench the guide-blade Fig. 7 shows how the'clenched fastening of Fig. 6 can be duplicated when large guideblades or vanes are required to be secured.
vOn the other hand Fig. 7 shows how the fastening canbe effected by a single fang.
Figs. 8 and 9 show two views of a guideblade or vane e which is formed in one with its'distance piece c and also with its shrouding piece 6 the rod (I laid in the groove serving to spread the bifurcated portions into the undercut sides of the groove as in the previous examples.
Figs. 10 to 14 refer to a modification of the constructionv shown in Fi s. 1-5 in respect to the feature that the fu breadth of the guide-blade or vane is retained in the shank portion. To effect the, bifurcation the notch a is made widerasshown in Fi 10. In such a construction the portions sp ayed into the undercut sides of the groove are wider apart.
Fig. 11 is a section through 1 111 of Fig. 10 from which it will be seen-that when the fangs a a which in this case are inclined to the sides of the groove, are splayed into the seems undercut sides they curl backwards and so augment their surface contact with the sides of the groove as indicated in the plan view of Fig. 13.. In Figs. 14 and 14 are determine the pitch .of the guide-b ades or vanes, the intervening spaces being plugged by bifurcated blocks as before described.
Fi 18-20 show a modification of the device iist described in' which, for the rod d, 'is substituted. a notched filling iece d, the transverse. section of which is s own in Fig. 19, this being taken alon the line 19.19 of Fig; 18. The notches d 3 of this iece are adapted to receive the shanks o the 'de-blade's or vanes.
V A still further modification of this device is shown in Figs. 21 and 22, Fig. 22 being a section'along the line 22-22 of Fig. 21. In
' this the notched distance piece d does not fill the ooves but leaves a space above to be filled with whitemetal (1 cast or plugged in,
n the undercut channeled (1 being forme oove which become filled by the sides of the white met and assist in strengthening the connections.
1. Means for securing turbine blades formed froma strip of uniform section to their carrying elements, comprising an une dercutring groove in the carrying element, and a' bifurcated" shank formed integrally with the blade, and means for directing the bifurcations into the undercut portions of r-thegroove which means consists of a longitudrnal rod.
2..Means. for securing turbine blades formed from a strip of uniform section, to V their carrying elements, comprising an undercut ring groove in the carrying element,
their carrying elements, comprising'an unand a bifurcated. shank formed integrally with the blade and means for directing the bifurcations into the undercut portion of the oove which means consists of a notched ongitud nal rod.
3. Means for securing turbine blades formed from a. strip of uniform section to their carrying elements, comprising an un- 1 dercut ring groove in the carrying element, and a duplicated bifurcated shank formed integrally with the blade, and means for directmg the bifurcations into the undercut portions of the groove.
4. Means for spac' turbine blades, formed from a strip of uniform section, comprising an undercut rin oove in their carrying elements, and a piece ha a fang which on being forced into the ring groove will be distorted to occupy the recess eneath the overhanging wall 0 the oove.
5. Meansfor spacing turbine blades ormed from a strip of uniform section, comprising an undercut ring groove in their carrying elements, a bifurcated filling piece, and means for directing the bifurcations into the undercut portions of the groove.
6. Means for securing turbine blades formed from a strip of uniform section to dercut ring groove in the carryin element, a shank formed integrally with t eblades. having a fang, and a filhng iece having a fang,'which fangs on being orced into the groove will be distorted to occupy the recess beneath the overhanging wallof the oove.
e 7. Means for securing turbine blades formed from a strip of uniform section to their carrying elements, comprising an undercut oove in the c element, a bifurcated s ank formed integrally with the blades, a bifurcated piece, and means for directing the bifurcations into the undercut portions of the groove.
In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.
- ALEXANDER JUDE.
E. M. WEBB, K. M. THOMPSON.