Patent US3858290A successfully refreshed from Google Patents.
US3858290A
Expired / Lapsed
US
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Method of making inserts for cooled turbine blades
Assignee: Avco Corp
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Filing: 1972-11-21
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Granted: 1975-01-07
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Expires: 1992-11-21
Abstract
Abstract A method is described for making inserts used in aircooled turbine blades. A length of tubing is first selectively reduced in wall thickness to form a thick walled lower portion. This tubular element is then collapsed to an air foil shape with the thick walled portions in contiguous relation. An end cap is secured to the outer, thin walled portion of the tubular element. Lower corner portions of the collapsed tube are cut away to form cooling air entrances. A hole is formed in the collapsed thick walled portions to receive a pin which retains the insert on the turbine blade. Impingement air discharge holes are drilled in the thin walled portion of the insert thus formed.
Inventors
- 👤 Peter E Albani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:43
CPC Classifications
B; B23; B23P; B23P15/00; B23P15/02; F; F01; F01D; F01D5/00; F01D5/12; F01D5/14; F01D5/147; F01D5/18; F01D5/187; F01D5/188; F01D5/189; F05; F05D; F05D2260/00; F05D2260/20; F05D2260/201; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/49336; Y10T29/49339; Y10T29/49341; Y10T29/49343
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
184 words
The method of forming a thin walled insert for incorporation in an air cooled hollow turbine blade, said blade comprising an integral air foil projecting from a tang for mounting said blade to a rotor, comprising the steps of selectively removing material from the inner diameter of the upper portion of a length of tubing to define a desired wall thinness in the upper portion and a relatively thick portion at the lower end thereof collapsing said tubular element to an air foil configuration by pressure exerted normal to the axis of the tube wherein the interior of said thick walled portions are in closely spaced contiguous relationship and said thin walled upper portions are spaced, said thin walled upper portion generally conforming to the interior configuration of a portion of said hollow turbine blade but being dimensioned smaller than said portion, said thick walled portions extending into said tang; and forming a retainer receiving surface through the thick walled lower portion, said retainer receiving surface being connectable to said tang to provide the primary retaining means between said turbine blade and said insert.
Claim 2
Independent Claim
184 words
The method of forming a thin walled insert for incorporation in an air cooled hollow turbine blade, said blade comprising an integral air foil projecting from a tang for mounting said blade to a rotor, comprising the steps of selectively removing material from the inner diameter of the upper portion of a length of tubing to define a desired wall thinness in the upper portion and a relatively thick portion at the lower end thereof collapsing said tubular element to an air foil configuration by pressure exerted normal to the axis of the tube wherein the interior of said thick walled portions are in closely spaced contiguous relationship and said thin walled upper portions are spaced, said thin walled upper portion generally conforming to the interior configuration of a portion of said hollow turbine blade but being dimensioned smaller than said portion, said thick walled portions extending into said tang; and forming a retainer receiving surface through the thick walled lower portion, said retainer receiving surface being connectable to said tang to provide the primary retaining means between said turbine blade and said insert.
Claim 3
Dependent Claim
42 words
The method of claim 1 further comprising the step of removing a corner portion of the lower end of the collapsed tube, which corner portion includes both thick walled and thin walled portions thereof to form a cooling air entrance passageway therein.
Claim 4
Dependent Claim
29 words
The method of claim 1 further comprising the step of forming small holes in the thin walled portion of the collapsed tube for impingement discharge of cooling air therefrom.
Claim 5
Dependent Claim
52 words
The method of claim 3 further comprising the steps of inserting a cap having an outline corresponding to the interior outline of the collapsed tube and an outwardly projecting peripheral flange into the outer end of the collapsed tube and securing said flange to the outer marginal portions of the collapsed tube.
Claim 6
Dependent Claim
71 words
The method of claim 4 further comprising the steps of filling said tubular element with a flowable, resistance material before the collapsing step, and wherein the step of forming a retainer receiving surface comprises forming a hole transversely through the thick walled portions of the collapsed tube intermediate its leading and trailing edges, said thick walled portions being connectable to said tang by means of a pin extending through said hole.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |