US4211516A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blade structure for fluid flow rotary machine
Assignee: BBC Brown Boveri AG Switzerland
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Filing: 1977-04-20
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Granted: 1980-07-08
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Expires: 1997-04-20
Abstract
Abstract A blade structure for use in a fluid flow rotary machine wherein the blade profile is thickened within the head region and a cover plate is connected to the head end within the thickened region by means of a substantially loop-shaped welded joint which is made by use of a high-energy beam such as an electron beam applied to the surface of the cover plate. The starting and end portions of the welding run can be overlapped, and the intensity of the welding beam is gradually increased from the starting point of the run to eliminate any swelling effect and is gradually reduced towards the end of the run to prevent crater formation.
Inventors
- 👤 Peter Speil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:37
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/22; F01D5/225
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
148 words
A blade structure for use in a fluid flow rotary machine comprising: a blade having a profile which is thickened at least within an enlarged leading edge; and a cover plate connected to the blade at the blade head thickened region by at least one welded joint, the welded joint forming a substantially closed loop and having an elliptical configuration with the major axis of the elliptical welded joint extending approximately in the direction of the longitudinal axis of the thickened region of the blade profile, the welded joint including at least one looping welded seam arranged substantially within a periphery of the blade profile; said looping welded seam being formed over only a portion of the blade profile and at least a portion of said looping welded seam being spaced from the periphery of the blade profile by a distance sufficient to prevent any detrimental influence thereon.
Claim 2
Dependent Claim
148 words
A blade structure for use in a fluid flow rotary machine comprising: a blade having a profile which is thickened at least within an enlarged leading edge; and a cover plate connected to the blade at the blade head thickened region by at least one welded joint, the welded joint forming a substantially closed loop and having an elliptical configuration with the major axis of the elliptical welded joint extending approximately in the direction of the longitudinal axis of the thickened region of the blade profile, the welded joint including at least one looping welded seam arranged substantially within a periphery of the blade profile; said looping welded seam being formed over only a portion of the blade profile and at least a portion of said looping welded seam being spaced from the periphery of the blade profile by a distance sufficient to prevent any detrimental influence thereon.
Claim 3
Dependent Claim
19 words
A blade structure as defined in claim 1 wherein the starting and end zones of said welded joint overlap.
Claim 4
Dependent Claim
20 words
A blade structure as defined in claim 1 wherein the blade contacts the cover plate substantially along the blade profile.
Claim 5
Dependent Claim
22 words
A blade structure as defined in claim 1 wherein the entire looping welded seam lies within the periphery of the blade profile.
Claim 6
Dependent Claim
23 words
A blade structure as defined in claim 1 wherein the entire looping welded seam is spaced from the periphery of the blade profile.
Claim 7
Dependent Claim
22 words
A blade structure as defined in claim 1 wherein the at least one looping welded seam is formed by electron beam welding.
Claim 8
Dependent Claim
28 words
A blade structure as defined in claim 1 wherein the at least one looping welded seam has a width, said width being narrow relative to the blade profile.
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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) | 1983-07-08 | 1984-01-07 | 1984-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-08 | 1988-01-07 | 1988-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-08 | 1992-01-07 | 1992-07-08 | $7700.00 | Window Closed / Lapsed |