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Patent US5246339A successfully refreshed from Google Patents.
US5246339A
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Guide vane for an axial fan
Assignee: ABB Technology FLB AB
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Filing: 1992-07-10
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Granted: 1993-09-21
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Expires: 2012-07-10
Abstract
Abstract A guide vane for an axial fan is formed in the end portion facing towards the fan with a web between the radially outer and inner portions of the guide vane. The arc length L 2 along the single-curved vane is shorter at the level of the web than at the outer and inner portions L 3 and L 1 , respectively.
Inventors
- 👤 Anders Bengtsson
- 👤 Erik Boos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:32
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/40; F04D29/52; F04D29/54; F04D29/541; F04D29/542; F04D29/544
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
108 words
Guide vane for an axial fan, which comprises: a curved guide vane having radially inner and outer portions; and a web formed between said radially inner and outer portions of the guide vane along a portion of the guide vane facing toward the fan wherein the arc length along the curved guide vane at the level of the web is shorter than at said inner and outer portions of said guide vane and wherein the ratio between the length L 1 of the radially inner edge of the guide vane and the length L 2 of the guide vane at the level of the web meets the condition:
Claim 2
Dependent Claim
108 words
Guide vane for an axial fan, which comprises: a curved guide vane having radially inner and outer portions; and a web formed between said radially inner and outer portions of the guide vane along a portion of the guide vane facing toward the fan wherein the arc length along the curved guide vane at the level of the web is shorter than at said inner and outer portions of said guide vane and wherein the ratio between the length L 1 of the radially inner edge of the guide vane and the length L 2 of the guide vane at the level of the web meets the condition:
Claim 3
Dependent Claim
5 words
25<L 1 /L 2 <3.0.
Claim 4
Dependent Claim
5 words
25<L 1 /L 2 <3.0.
Claim 5
Dependent Claim
24 words
Guide vane as claimed in claim 1, wherein the edge of the front end portion facing towards the fan has a continuous concave shape.
Claim 6
Dependent Claim
15 words
Guide vane as claimed in claim 2, wherein the front edge has a parabolalike shape.
Claim 7
Dependent Claim
26 words
Guide vane as claimed in claim 1, wherein the edge of the front end portion facing towards the fan has the shape of a polygonal train.
Claim 8
Dependent Claim
27 words
Guide vane as claimed in claim 4, wherein the edge of the front end portion facing towards the fan has the form of a trilateral polygonal train.
Claim 9
Dependent Claim
25 words
Guide vane as claimed in claim 1, wherein the inlet angle α, at the root portion of the guide vane meets the condition 40°<α.sub.1 <70°.
Claim 10
Dependent Claim
26 words
Guide vane as claimed in claim 6, wherein the inlet angle α, at the root portion of the guide vane meets the condition 52°<α 1 <70°.
Claim 11
Dependent Claim
19 words
Guide vane as claimed in claim 1, wherein the single-curved guide vane has a constant radius of curvature R.
Claim 12
Dependent Claim
35 words
Guide vane as claimed in claim 8, wherein the ratio between the radius of curvature R and the length L 1 of the radially inner edge of the guide vane meets the condition 0.83<R/L.sub.1 <1.45
Claim 13
Dependent Claim
35 words
Guide vane according to claim 9, wherein the ratio between the radius of curvature R and the length L 1 of the radially inner edge of the guide vane meets the condition 0.83<R/L 1 <1.10.
Claim 14
Dependent Claim
42 words
Guide vane as claimed in claim 1, wherein the ratio between the height H 1 of the position of the web from the radially inner edge and the total height H 2 of the guide vane meets the condition 0.4≦H.sub.1 /H.sub.2 <0.9.
Claim 15
Dependent Claim
42 words
Guide vane as claimed in claim 11, wherein the ratio between the height H 1 of the position of the web from the radially inner edge of the total height H 2 of the guide vane meets the condition 0.5<H.sub.1 /H.sub.2 <0.8.
Claim 16
Dependent Claim
39 words
Guide vane as claimed in any one of claim 1, wherein the ratio between the lengths L 3 and L 1 of the radially outer and inner edges respectively of the guide vane meets the condition 0.5≦L.sub.3 /L.sub.1 ≦0.7.
Claim 17
Dependent Claim
42 words
Guide vane as claimed in any one of claim 1, wherein the ratio between the radii R 1 and R 2 from the fan axis to the outer and inner edges, respectively, of the guide vane meets the condition 0.3≦R.sub.1 /R.sub.2 ≦0.8.
Claim 18
Dependent Claim
37 words
Guide vane according to claim 14, wherein the ratio between the radii R 1 and R 2 from the fan axis to the outer and inner edges of the guide vane meets the condition 0.45<R.sub.1 /R.sub.2 <0.72.
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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) | 1996-09-20 | 1997-03-22 | 1997-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-09-20 | 2001-03-22 | 2001-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-09-20 | 2005-03-22 | 2005-09-21 | $7700.00 | Window Closed / Lapsed |