US5929550A — Ventilated creepage blocks

Claim 1

Independent Claim 77 words

A creepage block for a turbine rotor slot in which coil windings are received, wherein the creepage block is, in use, radially sandwiched between the windings and a wedge block, and wherein aligned radial cooling passages are formed in axially spaced locations in said windings and said wedge block, said creepage block comprising: a pair of solid half blocks in substantially parallel side-by-side relationship, said blocks held in laterally spaced relation by a plurality of discrete spacers.

Claim 2

Dependent Claim 77 words

A creepage block for a turbine rotor slot in which coil windings are received, wherein the creepage block is, in use, radially sandwiched between the windings and a wedge block, and wherein aligned radial cooling passages are formed in axially spaced locations in said windings and said wedge block, said creepage block comprising: a pair of solid half blocks in substantially parallel side-by-side relationship, said blocks held in laterally spaced relation by a plurality of discrete spacers.

Claim 3

Dependent Claim 22 words

The creepage block of claim 1 wherein said spacers comprise dowel pins extending alternatively from oppositely facing sides of said half blocks.

Claim 4

Dependent Claim 17 words

The creepage block of claim 2 wherein said dowel pins are equally spaced in the axial direction.

Claim 5

Dependent Claim 18 words

The creepage block of claim 3 wherein said half blocks, when assembled, are mirror images of each other.

Claim 6

Dependent Claim 32 words

The creepage block of claim 2 wherein said dowel pins have a pitch length which is an integral multiple of a corresponding pitch length for the radial cooling passages in the windings.

Claim 7

Dependent Claim 33 words

The creepage block of claim 2 wherein each dowel pin has a length equal to the sum of a width dimension parallel to the pin and a lateral spacing between the half blocks.

Claim 8

Dependent Claim 32 words

The creepage block of claim 2 wherein said dowel pins have a pitch length which is an integral multiple of a corresponding pitch length for the radial cooling passages in the windings.

Claim 9

Dependent Claim 121 words

A creepage block for a turbine rotor slot in which coil windings are received, wherein the creepage block is, in use, radially sandwiched between the windings and a wedge block, and wherein aligned radial cooling passages are formed in axially spaced locations in said windings and said wedge block, said creepage block comprising: a pair of solid half blocks in substantially parallel side-by-side relationship, said blocks held in laterally spaced relation by a plurality of discrete spacers, wherein said spacers comprise dowel pins extending alternatively from oppositely facing sides of said half blocks, and wherein each said dowel pin is received in a hole in a corresponding one of said half blocks, said hole extending completely through said corresponding half block.

Claim 10

Dependent Claim 121 words

A creepage block for a turbine rotor slot in which coil windings are received, wherein the creepage block is, in use, radially sandwiched between the windings and a wedge block, and wherein aligned radial cooling passages are formed in axially spaced locations in said windings and said wedge block, said creepage block comprising: a pair of solid half blocks in substantially parallel side-by-side relationship, said blocks held in laterally spaced relation by a plurality of discrete spacers, wherein said spacers comprise dowel pins extending alternatively from oppositely facing sides of said half blocks, and wherein each said dowel pin is received in a hole in a corresponding one of said half blocks, said hole extending completely through said corresponding half block.

Claim 11

Dependent Claim 20 words

The creepage block of claim 8 wherein each pin extends through substantially the full thickness of said corresponding half block.

Claim 12

Dependent Claim 103 words

In a turbine rotor having a plurality of radially extending coil slots, each slot having a plurality of windings received therein, said windings held in each said slot by at least one axially extending wedge block and at least one axially extending creepage block, with said creepage block radially sandwiched between said windings and said wedge block, and wherein said windings and said wedge block have a plurality of axially spaced radially extending coolant passages, an improved creepage block comprising a pair of solid half blocks in substantially parallel relationship, said blocks held in laterally spaced relation by a plurality of discrete spacers.

Claim 13

Dependent Claim 103 words

In a turbine rotor having a plurality of radially extending coil slots, each slot having a plurality of windings received therein, said windings held in each said slot by at least one axially extending wedge block and at least one axially extending creepage block, with said creepage block radially sandwiched between said windings and said wedge block, and wherein said windings and said wedge block have a plurality of axially spaced radially extending coolant passages, an improved creepage block comprising a pair of solid half blocks in substantially parallel relationship, said blocks held in laterally spaced relation by a plurality of discrete spacers.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	2002-07-26	2003-01-25	2003-07-27	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2006-07-26	2007-01-25	2007-07-27	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2010-07-26	2011-01-25	2011-07-27	$7700.00	Window Closed / Lapsed

Ventilated creepage blocks

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