US994029A - Strips for turbine-blades. - Google Patents

Description

C. A. PARSONS. STRIPS FOR TURBINE BLADES.

APPLICATION FILED AUG. 12, 1907.

Patented May 30, 1911.

UNITED STATES PATENT ()FFICE.

CHARLES ALGERNON PARSONS, OF NEWCASTLE-UPON-TYNE, ENGLAND.

STRIPS FOB. TURBINE-BLADES.

Specification of Letters Patent.

Patented May 30, 1911.

Application filed August 12, 1907. Serial No. 388,235.

avoid corrosion of the rotating drum and easing.

This invention may' be applied with any form of blading, but particularly with that form in which a blade holding strip is employed. In such blade fixing it has been proposed to make the blade carrying strip of considerably greatercwidth than the blades they support, thereby providing a tread. An objection to widening the blade strip in this way is that the metal between the strips becomes too thin in comparison with the depth of the groove.

The invention consists in providing in conjunction with blade or other strips, means for covering those parts of the rotating drum and easing which would otherwise be exposed to corroding action and in which said blades are supported.

Referring now to the accompanying drawings which form part of this specification and serve to illustrate convenient forms of carrying this invention into practical efiect, Figure l is a section showing a form in which both the cylinder and drum of the turbine are protected by an angle piece ex- .tending the whole way between the adjacent rows of bladeson the turbine drum and casing. Figs. 2 to 6 are similar sections show-- ing modified forms of the protectlng or co ering strips.

., fi -carrying this invention into eifect, any form of blade-fixing may be used either blade fixings in which separate distance pieces between the blades and culked in the grooves or those fixings in which the blades are carried by a strip and this strip or string of blades is secured in the drum or casing-by calking direztly. .or on an additional strip or by other well known means. Forms of blade fixings such as indicated are well known and need no further description here.

In Fig. l, the blades, a, are carried by a strip, b, which rests in a groove, 0, provided with corrugations. also passes an, angle strip, cl, having corrugations or dovetails corresponding to the corrugations oi'dovetails in the groove. The strip, 6, and the angle strip, d, may now be calked so as to hold the blades or bladed strip mly in place. The side, e, of the angle giece, (Z, is comparatively thin and forms a covering for the drum, 7', or casing, g. It will be seen the corrugations may be omitted, as shown in Fig. 1, as applied to the fixed blades in the drum, g

In the form of the invention shown in Fig. 2, the covering piece, 6, is in the form of a channel having the parts, h, h, resting in the grooves. additional calking piece, 7'.

Fig. 3 shows a form in which instead of a channel a double angle is used, the two parts, 7c, is, of the angle meeting, or practically meeting, midway or at other positions between the grooves so as to provide a covering for the drum and easing.

Instead of employing a separate piece for carrying the protecting strip, I may form the root strip with a tin or web such as m, m,

extending on either side of the grooves as shown in Fig. 4 or on one side only as shown in Fig. 5; or again, the protecting strip may be inserted in a separate groove, n, independently of the blade grooves as shown in Fig. 6.

Many other modifications might be made to this invention and it will be understood that the protecting strip is fixed in the way best-suited to the .form of blading adopted.

It is customary sometimes to provide a side packing forgtlie blades at the tip or at the root 'and-this ,-packing, a ring or brush carried by the blades, bears against the root strip of the adja'cent row of blades. This bearing surface may, as will be readily understood, be formed on the protecting strip somewhat inthe fashien indicated inFig. where, 0, represents the ring carried by the; blade, this ring being adapted to bean-on a projection, 29, carried by the protecting strip.

The surface of the protecting strip may be finely serrated as described in British Patent No. 221.27 of 1905.

Into thegroove there 60 In Fig. 2 there is also shown an 75 Having thus described my invention What I claim as new and desire to secure by Letters Patent is:

1.In combination in a turbine having fixed and rotating bladed parts, strips prevening corrosion of the exposed surface of said parts, and corrugated means holding said strips in position on one of the turbine parts. 4 g 2. In combination in a turbine having fixed and rotating bladed parts, strips preventing corrosion of the exposed surface of said parts and corrugated means holding said strips in position on the rotating turbine part.

3. In combination in a turbine having fixed and rotating blades carriedby fixed and rotating parts, strips preventing corrosion of the exposed surface of said parts and corrugated means holding said strips in position on one of said parts.

at. A turbine comprising in combination fixed andirotating parts, blades carried in grooves in said parts, strips covering the exposed surface of said parts, a part of each strip extending Within said grooves, corrugations on the extended part of the strips belonging to one of the turbine parts, said corrugations engaging with corresponding corrugations in the grooves in that turbine part.

5; A turbine comprising in combination fixed and rotating parts, blades carried in grooves in said parts, strips covering theexposed surface of said parts, a part of said strips extending Within said grooves and corrugations on the extended part of the strips attached to the rotating turbine part, said corrugations engaging with corresponding corrugations in the grooves on the rotating art.

p 6. In combination in grooves on turbine drums and casings, blades and blade holding. means, corrugated l. shaped pieces extending on either side of the groove half-way toward,

the adjacent grooves.

7 In combination in grooves on turbine drums and casings, blades and blade holding means, L shaped pieces in said grooves, and extending along the surface of the drum or casing toward the adjacent grooves for the purpose of covering the exposed part of the drum or casing, said covering pieces having corrugations on their external faces.

8. In combination in grooves on turbine drums and casings, blades and blade holding means, L shaped pieces in said grooves and extending along the surface of the drum or casing toward the adjacent grooves for the purpose of covering the exposed surface of the drum or casing, said covering pieces on the drum having corrugations on their external faces, side packing means for said blades carried by said covering strips.

In testimony whereof, I affix my signature in presence of two Witnesses.

CHARLES ALGERNON PARSONS. Witnesses:

HENRY GRAHAM DAKYNS, Jr., FREDERICK GonnoN HAY Benronn.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Eatents,

Washington, D. 0.

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