Patent US1152389A successfully refreshed from Google Patents.
Patent US3873232A successfully refreshed from Google Patents.
US3873232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-piece channel diffuser
Assignee: Avco Corp
•
Filing: 1973-11-29
•
Granted: 1975-03-25
•
Expires: 1993-11-29
Abstract
Abstract A channel diffuser for a centrifugal compressor in which the diffuser is formed from two annular elements, sandwiched together. One element is a flangelike portion of the outer housing for an engine and has a smooth radially extending face. The second element has a series of tangentially directed channels open toward the radial face on the first element to form diffuser passages. The channels in the second element diverge both in width and in height so that all the divergence in the passages is provided by the channels.
Inventors
- 👤 Wolfgang J Stein
- 👤 Salvatore Straniti
- 👤 John T Exley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:12
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/40; F04D29/42; F04D29/44; F04D29/441
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
214 words
A compressor diffuser for use with a gas turbine engine having a generally annular housing comprising: a first annular element having a substantially smooth face defined by an inner and outer diameter, said face being defined by straight-lined elements extending radially from said inner to said outer diameter, said first annular element forming a portion of said housing; a second annular element having an inner and outer diameter substantially equal to the inner and outer diameter of the face on said first element, said second annular element abutting the face of said first element, said second element having a plurality of tangentially directed channels extending from the inner to the outer diameter of said second element to form a series of diffuser passages, said Passages comprising an inlet throat section having a constant height and width, a first diffusing section having a height and width which expand at a first rate and a second diffusing section having a height and width which expands at a second faster rate, said widths expanding in the downstream portion of the channel whereby said diffuser sections provide an increasing cross-sectional flow area defined by an increasing channel depth and increasing channel width and whereby all of the divergence in the diffuser passageways takes place in said second element.
Claim 2
Dependent Claim
214 words
A compressor diffuser for use with a gas turbine engine having a generally annular housing comprising: a first annular element having a substantially smooth face defined by an inner and outer diameter, said face being defined by straight-lined elements extending radially from said inner to said outer diameter, said first annular element forming a portion of said housing; a second annular element having an inner and outer diameter substantially equal to the inner and outer diameter of the face on said first element, said second annular element abutting the face of said first element, said second element having a plurality of tangentially directed channels extending from the inner to the outer diameter of said second element to form a series of diffuser passages, said Passages comprising an inlet throat section having a constant height and width, a first diffusing section having a height and width which expand at a first rate and a second diffusing section having a height and width which expands at a second faster rate, said widths expanding in the downstream portion of the channel whereby said diffuser sections provide an increasing cross-sectional flow area defined by an increasing channel depth and increasing channel width and whereby all of the divergence in the diffuser passageways takes place in said second element.
Claim 3
Dependent Claim
26 words
Apparatus as in claim 1 wherein said first annular element is in the form of a flange and said smooth face is in a radial plane.
Claim 4
Dependent Claim
39 words
Apparatus as in claim 1 wherein said gas turbine engine comprises a combustor positioned downstream from said diffuser and an outer housing surrounding said combustor, said outer housing being removably secured to the periphery of said first annular element.
Claim 5
Dependent Claim
55 words
Apparatus as in claim 3 wherein the first element has a periphery extending radially outward beyond the periphery of said second annular elemennt, said annular outer housing being attached to the periphery of said first element thereby forming an annular flow path turning air discharged from said diffuser from a radial to an axial direction.
Claim 6
Dependent Claim
33 words
Apparatus as in claim 4 wherein said second element has an aft flange and a curved lip positioned inward from said annular outer housing thereby defining, in part, said annular flow turning passage.
Claim 7
Dependent Claim
52 words
Apparatus as in claim 1 wherein said second annular element is a unitary piece of material having said passages formed in one face as a series of tangentially directed channels separated by generally wedge-shaped segments forming, in combination with the face on said first element, passages having a generally rectangular cross section.
Claim 8
Dependent Claim
20 words
Apparatus as in claim 6 further comprising means for releasably holding said first and second annular elements against one another.
Claim 9
Dependent Claim
26 words
Apparatus as in claim 7 wherein said releasable holding means comprises a plurality of bolts extending through one and threaded into the other of said elements.
Claim 10
Dependent Claim
49 words
Apparatus as in claim 6 wherein said second annular element is cast and has a plurality of pockets formed in said wedge-shaped portions, said pockets being opened to the face of said second element that is opposite the face in contact with the annular face on said first element.
References Cited (Backward Citations)
US1879561A
Cited
US2042550A
Cited
US3027717A
Cited
US3088279A
Cited
US3305165A
Cited
US3489339A
Cited
US3658437A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |