US4992025A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film cooled components
Assignee: Rolls Royce PLC
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Filing: 1989-10-10
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Granted: 1991-02-12
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Expires: 2009-10-10
Abstract
Abstract A variety of configurations for convergent-divergent film cooling holes are disclosed, together with the hole drilling methods necessary to achieve the configurations.
Inventors
- 👤 David Stroud
- 👤 Arthur G. Corfe
- 👤 Jonathan P. W. Towill
- 👤 Brian G. Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:50
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/22; F01D5/225; B; B23; B23K; B23K26/00; B23K26/36; B23K26/38; B23K26/382; B23K26/384; B23K26/389; F01D5/14; F01D5/18; F01D5/186; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/49336; Y10T29/49339; Y10T29/49341
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
143 words
A film-opposed component subject to heating by hot fluid flowing therepast, the component having wall means with one side thereof being a first surface subject to said heating and the other side thereof being a second surface subject to cooling by flow of pressurized coolant therepast, the wall means having a plurality of film cooling holes therethrough connecting the first and second surfaces to allow coolant to flow through said holes onto the first surface for film-cooling of the same, wherein the holes comprise in coolant flow series an inlet aperture on the second surface, a convergent portion, a coolant flow metering restriction, a divergent portion and an outlet aperture on the first surface, the metering restriction connecting the narrowest parts of the convergent and divergent portions, wherein no line of said convergent portion is co-linear with a line of said divergent portion.
Claim 2
Dependent Claim
143 words
A film-opposed component subject to heating by hot fluid flowing therepast, the component having wall means with one side thereof being a first surface subject to said heating and the other side thereof being a second surface subject to cooling by flow of pressurized coolant therepast, the wall means having a plurality of film cooling holes therethrough connecting the first and second surfaces to allow coolant to flow through said holes onto the first surface for film-cooling of the same, wherein the holes comprise in coolant flow series an inlet aperture on the second surface, a convergent portion, a coolant flow metering restriction, a divergent portion and an outlet aperture on the first surface, the metering restriction connecting the narrowest parts of the convergent and divergent portions, wherein no line of said convergent portion is co-linear with a line of said divergent portion.
Claim 3
Dependent Claim
23 words
A component according to claim 1 in which the metering restriction comprises an edge at an intersection of the convergent and divergent portions.
Claim 4
Dependent Claim
15 words
A component according to claim 1 in which the metering restriction comprises a short passage.
Claim 5
Dependent Claim
17 words
A component according to claim 1 in which the convergent and divergent portions are frusto-conical in shape.
Claim 6
Dependent Claim
15 words
A component according to claim 1 in which the convergent and divergent portions are fan-shaped.
Claim 7
Dependent Claim
15 words
A component according to claim 1 in which the inlet and outlet apertures are elongate.
Claim 8
Dependent Claim
40 words
A component according to claim 1 in which the inlet and outlet apertures, the convergent and divergent portions and the metering restriction comprise the three-dimensional envelope of a plurality of mutually crossing holes which overlap each other throughout their lengths.
Claim 9
Dependent Claim
45 words
A component according to claim 1 in which the film cooling holes are oriented with respect to their penetration of the first surface such that coolant discharged therefrom has a component of velocity in the same direction as the expected flow of hot fluid therepast.
Claim 10
Dependent Claim
25 words
A component according to claim 1 in which the outlet apertures are elongate in a direction transverse of the expected flow of hot fluid therepast.
Claim 11
Dependent Claim
24 words
A component according to claim 1 in which the inlet apertures are elongate in a direction transverse of the expected flow to coolant therepast.
Claim 12
Dependent Claim
80 words
A method of drilling film cooling holes in the film cooled component claimed in claim 1, comprising directing a laser beam onto one of said first and second surfaces to remove material therefrom, angularly oscillating the laser beam about a chosen point of null beam movement within the wall means, and continuing to drill until both the outlet and inlet portions of the film cooling hole have been produced, the metering restriction thereby being produced around said chosen null point.
Claim 13
Dependent Claim
104 words
A method of drilling film cooling holes in the film cooled component claimed in claim 4, comprising directing a laser beam onto one of said first and second surfaces to remove material therefrom, angularly oscillating the laser beam about a chosen point of null beam movement within the wall means, and continuing to drill until both the outlet and inlet portions of the film cooling hole have been produced, the metering restriction thereby being produced around said chosen null point, the centerline of the beam having an envelope of oscillation which is a double cone shape whose common apex is the chosen null point.
Claim 14
Dependent Claim
104 words
A method of drilling film cooling holes in the film cooled component claimed in claim 5, comprising directing a laser beam onto one of said first and second surfaces to remove material therefrom, angularly oscillating the laser beam about a chosen point of null beam movement within the wall means, and continuing to drill until both the outlet and inlet portions of the film cooling hole have been produced, the metering restriction thereby being produced around said chosen null point, the centerline of the beam having an envelope of oscillation which is a double fan shape whose common apex is the chosen null point.
Claim 15
Dependent Claim
91 words
A method of drilling film cooling holes in the film-cooled component claimed in claim 1, comprising electro-discharge machining one of said first and second surfaces with an end of a rod-shaped electrode, angularly oscillating the electrode about a chosen point of null movement within the wall means while containing to progressively remove material by advancing the machining end of the electrode, and continuing to drill unit both the outlet and inlet portions of the film cooling hole having been produced, the metering restriction thereby being produced around said chosen null point.
Claim 16
Dependent Claim
115 words
A method of drilling film cooling holes in the film-cooled component claimed in claim 4, comprising electro-discharge machining one of said first and second surfaces with an end of a rod-shaped electrode, angularly oscillating the electrode about a chosen point of null movement within the wall means while containing to progressively remove material by advancing the machining end of the electrode, and continuing to drill until both the outlet and inlet portions of the film cooling hole have been produced, the metering restriction thereby being produced around said chosen null point, the centerline of the electrode having an envelope of oscillation which is a double cone shape whose common apex is the chosen null point.
Claim 17
Dependent Claim
115 words
A method of drilling film cooling holes in the film-cooled component claimed in claim 5, comprising electro-discharge machining one of said first and second surfaces with an end of a rod-shaped electrode, angularly oscillating the electrode about a chosen point of null movement within the wall means while continuing to progressively remove material by advancing the machining end of the electrode, and continuing to drill until both the outlet and inlet portions of the film cooling hole have been produced, the metering restriction thereby being produced around said chosen null point, the centerline of the electrode having an envelope of oscillation which is a double fan shape whose common apex is the chosen null point.
Claim 18
Dependent Claim
65 words
A method of drilling film cooling holes in the film-cooled component claimed in claim 7, comprising drilling a group of holes through the wall means to connect the first and second surfaces, the members of the group being drilled successively with mutually crossing orientation such that they penetrate the first and second surfaces in overlapping fashion and define at their mutual crossing said metering restriction.
Claim 19
Independent Claim
20 words
A method according to the preceding claim in which the holes are drilled by means of a laser drilling apparatus.
Claim 20
Dependent Claim
19 words
A method according to claim 17 in which the holes are drilled by means of an electro-discharge machining apparatus.
Claim 21
Dependent Claim
19 words
A method according to claim 17 in which the holes are drilled by means of an electro-chemical machining apparatus.
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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) | 1994-02-11 | 1994-08-13 | 1995-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-11 | 1998-08-13 | 1999-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-11 | 2002-08-13 | 2003-02-12 | $7700.00 | Window Closed / Lapsed |