US3845903A
Expired / Lapsed
US
⏱️ 0.0 years remaining
One piece radial vane diffuser and method of manufacturing the same
Assignee: Dunham Bush Inc
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Filing: 1973-08-15
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Granted: 1974-11-05
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Expires: 1993-08-15
Abstract
Abstract A one piece radial vane diffuser constitutes an annular array of curved, radially directed vanes, surrounding the combustion area of a fuel oil burner, downstream of the nozzle, and at the downstream end of a cylinder defining a primary air flow path concentric with the nozzle. A circular sheet metal sheet is first drawn into a cone, the vanes are lanced from the cone to form a circumferential array of integral, radially directed, side by side, generally rectangular vanes linked to an annular rim at their radial outermost ends by an integral hinge. The cone is then flattened, at least in the area of the vanes, to cause the vanes to move into edge overlapping position and preferably the vanes are bent or twisted about a radial axis passing through the hinge to provide air passages between vanes of predetermined size. The vanes may be curved relative to their radial axes to effect swirling of the primary air flow.
Inventors
- 👤 F Runninger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:38
CPC Classifications
F; F23; F23C; F23C7/00; F23C7/002; F23C7/004; B; B21; B21D; B21D53/00; B21D53/78; F23D; F23D11/00; F23D11/36; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/4932; Y10T29/49325
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
80 words
A one piece radiaL vane diffuser comprising: a circular metal sheet including an annular rim, a plurality of circumferentially spaced radial vanes partially struck from said sheet and being joined to said rim at their radially outermost ends by hinges integral with said rim, said vanes being of a width so as to overlap at their side edges, and said vanes being similarly twisted at said hinges, about a radial axis extending through said hinges to form air passages therebetween.
Claim 2
Dependent Claim
80 words
A one piece radiaL vane diffuser comprising: a circular metal sheet including an annular rim, a plurality of circumferentially spaced radial vanes partially struck from said sheet and being joined to said rim at their radially outermost ends by hinges integral with said rim, said vanes being of a width so as to overlap at their side edges, and said vanes being similarly twisted at said hinges, about a radial axis extending through said hinges to form air passages therebetween.
Claim 3
Dependent Claim
53 words
The radial vane diffuser as claimed in claim 1, wherein said vanes comprise sectors of said sheet and are severed therefrom except along one side edge of said vanes at their radial outer ends, with said vanes being twisted about a radial axis which coincides with said one side edge of said vanes.
Claim 4
Dependent Claim
34 words
The radial vane diffuser as claimed in claim 1, wherein the radially outer ends of said other side edge of each vane are tapered toward said one side edge thereof to form said hinge.
Claim 5
Dependent Claim
34 words
The radial vane diffuser as claimed in claim 2, wherein the radially outer ends of said other side edge of each vane are tapered toward said one side edge thereof to form said hinge.
Claim 6
Independent Claim
82 words
A method of manufacturing a one piece radial vane diffuser comprising the steps of: forming at least an interior portion of a circular flat sheet of metal into a cone, lancing the cone to form an annular outer rim and a circumferential array of integral, radially directed, generally rectangular vanes joined to said rim only at their radially outermost ends, and flattening at least that portion of said cone forming said vanes to cause said vanes to move into edge overlapping position.
Claim 7
Independent Claim
82 words
A method of manufacturing a one piece radial vane diffuser comprising the steps of: forming at least an interior portion of a circular flat sheet of metal into a cone, lancing the cone to form an annular outer rim and a circumferential array of integral, radially directed, generally rectangular vanes joined to said rim only at their radially outermost ends, and flattening at least that portion of said cone forming said vanes to cause said vanes to move into edge overlapping position.
Claim 8
Dependent Claim
34 words
The method of manufacturing a one piece radial vane diffuser as claimed in claim 5, further comprising twisting said vanes about a radial axis passing through the vanes to form air passages between vanes.
Claim 9
Dependent Claim
39 words
The method of manufacturing a one piece radial vane diffuser as claimed in claim 5, further comprising curving each vane about a radial axis thereof to cause swirl of the air flow passing through the air passages between vanes.
Claim 10
Dependent Claim
39 words
The method of manufacturing a one piece radial vane diffuser as claimed in claim 6, further comprising curving each vane about a radial axis thereof to cause swirl of the air flow passing through the air passages between vanes.
Claim 11
Dependent Claim
65 words
The method of manufacturing a one piece radial vane diffuser as claimed in claim 5, wherein the radially inner portion of said rim coupled to said vanes, is flattened along with said vanes at right angles to the radially outer peripheral portion of said sheet to define a circular, axially directed rim portion generally at right angles to the vanes and said inner rim portion.
Claim 12
Independent Claim
157 words
A method of manufacturing a one piece radial vane diffuser from a unitary sheet metal plate comprising the steps of: drawing said flat metal plate into conical form with a cylindrical rim portion at its outer periphery, lancing the conical portion to form an unsevered intermediate annular portion and a circumferentially array of integral, radially directed generally rectangular vanes joined to said intermediate annular portion only at their radially outermost ends by an integral hinge portion, and flattening the portion of said cone including said vanes and said intermediate annular portion to form an annular portion at right angles to said cylindrical rim and a plurality of circumferentially spaced edge overlapping vanes and curving said vanes about radial axes passing through the vanes to form axial air passages therebetween of predetermined size and configuration, whereby, the air swirls as it exits the air passages between the vanes and enters the axial passage determined by said cylindrical rim.
Claim 13
Independent Claim
157 words
A method of manufacturing a one piece radial vane diffuser from a unitary sheet metal plate comprising the steps of: drawing said flat metal plate into conical form with a cylindrical rim portion at its outer periphery, lancing the conical portion to form an unsevered intermediate annular portion and a circumferentially array of integral, radially directed generally rectangular vanes joined to said intermediate annular portion only at their radially outermost ends by an integral hinge portion, and flattening the portion of said cone including said vanes and said intermediate annular portion to form an annular portion at right angles to said cylindrical rim and a plurality of circumferentially spaced edge overlapping vanes and curving said vanes about radial axes passing through the vanes to form axial air passages therebetween of predetermined size and configuration, whereby, the air swirls as it exits the air passages between the vanes and enters the axial passage determined by said cylindrical rim.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |