US4225285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Axial-flow fan
Assignee: Ebm Papst Mulfingen GmbH and Co KGaA and Co KG
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Filing: 1978-09-18
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Granted: 1980-09-30
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Expires: 1998-09-18
Abstract
Abstract An axial-flow fan includes an impeller and a supporting member, a hollow elongated casing having a circumferential wall, an inlet and an outlet axially spaced from the inlet and defining with the circumferential wall the interior of the casing accommodating the impeller and the supporting member. The circumferential wall comprises a first conical annular portion adjacent to the inlet and diverging in the direction from the outlet to the inlet, a second conical annular portion adjacent to the outlet and diverging in the direction from the inlet to the outlet.
Inventors
- 👤 Gerhard Sturm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:07
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/40; F04D29/52; F04D29/54; F04D29/541; F04D29/545
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
203 words
An axial-flow fan, comprising an impeller means having a predetermined axial length and including an impeller and a supporting member, and a hollow elongated casing having a circumferential wall, an inlet and an outlet axially spaced from said inlet and defining together with said circumferential wall the interior of said casing accommodating said impeller means, said interior having an axial length corresponding to said predetermined length of said impeller means, whereby substantially the whole axial length of the interior of the casing is taken up by said impeller means, said circumferential wall comprising a first conical annular portion adjacent to said inlet and diverging in the direction from said outlet to said inlet and defining the first maximum cross-sectional dimension of said interior at said inlet of the casing, a second conical annular portion adjacent to said outlet and diverging in the direction from said inlet to said outlet and defining the second maximum cross-sectional dimension of said interior at said outlet of the casing, and an intermediate portion interposed between said first conical annular portion and said second conical annular portion, the axial dimensions of said second, intermediate and first portions being in proportion to each other in the order of 8:7:4.
Claim 2
Dependent Claim
203 words
An axial-flow fan, comprising an impeller means having a predetermined axial length and including an impeller and a supporting member, and a hollow elongated casing having a circumferential wall, an inlet and an outlet axially spaced from said inlet and defining together with said circumferential wall the interior of said casing accommodating said impeller means, said interior having an axial length corresponding to said predetermined length of said impeller means, whereby substantially the whole axial length of the interior of the casing is taken up by said impeller means, said circumferential wall comprising a first conical annular portion adjacent to said inlet and diverging in the direction from said outlet to said inlet and defining the first maximum cross-sectional dimension of said interior at said inlet of the casing, a second conical annular portion adjacent to said outlet and diverging in the direction from said inlet to said outlet and defining the second maximum cross-sectional dimension of said interior at said outlet of the casing, and an intermediate portion interposed between said first conical annular portion and said second conical annular portion, the axial dimensions of said second, intermediate and first portions being in proportion to each other in the order of 8:7:4.
Claim 3
Dependent Claim
197 words
An axial-flow fan, comprising an impeller means having a predetermined axial length and including an impeller and a supporting member, and a hollow elongated casing having a circumferential wall, an inlet and an outlet axially spaced from said inlet and defining together with said circumferential wall the interior of said casing accommodating said impeller means, said interior having an axial length corresponding to said predetermined length of said impeller means, whereby substantially the whole axial length of the interior of the casing is taken up by said impeller means, said circumferential wall comprising a first conical annular portion adjacent to said inlet and diverging in the direction from said outlet to said inlet and defining the first maximum cross-sectional dimension of said interior at said inlet of the casing, a second conical annular portion adjacent to said outlet and diverging in the direction from said inlet to said outlet and defining the second maximum cross-sectional dimension of said interior at said outlet of the casing, and an intermediate portion interposed between said first conical annular portion and said second conical annular portion, said intermediate portion constituting from 5% to 20% of the whole interior of the casing.
Claim 4
Dependent Claim
197 words
An axial-flow fan, comprising an impeller means having a predetermined axial length and including an impeller and a supporting member, and a hollow elongated casing having a circumferential wall, an inlet and an outlet axially spaced from said inlet and defining together with said circumferential wall the interior of said casing accommodating said impeller means, said interior having an axial length corresponding to said predetermined length of said impeller means, whereby substantially the whole axial length of the interior of the casing is taken up by said impeller means, said circumferential wall comprising a first conical annular portion adjacent to said inlet and diverging in the direction from said outlet to said inlet and defining the first maximum cross-sectional dimension of said interior at said inlet of the casing, a second conical annular portion adjacent to said outlet and diverging in the direction from said inlet to said outlet and defining the second maximum cross-sectional dimension of said interior at said outlet of the casing, and an intermediate portion interposed between said first conical annular portion and said second conical annular portion, said intermediate portion constituting from 5% to 20% of the whole interior of the casing.
Claim 5
Dependent Claim
200 words
An axial-flow fan, comprising an impeller means having a predetermined axial length and including an impeller and a supporting member, and a hollow elongated casing having a circumferential wall, an inlet and an outlet axially spaced from said inlet and defining together with said circumferential wall the interior of said casing accommodating said impeller means, said interior having an axial length corresponding to said predetermined length of said impeller means, whereby substantially the whole axial length of the interior of the casing is taken up by said impeller means, said circumferential wall comprising a first conical annular portion adjacent to said inlet and diverging in the direction from said outlet to said inlet and defining the first maximum cross-sectional dimension of said interior at said inlet of the casing, a second conical annular portion adjacent to said outlet and diverging in the direction from said inlet to said outlet and defining the second maximum cross-sectional dimension of said interior at said outlet of the casing, and an intermediate portion interposed between said first conical annular portion and said second conical annular portion, said second maximum cross-sectional dimension of the casing exceeding said first maximum cross-sectional dimension from 1% to 4%.
Claim 6
Dependent Claim
200 words
An axial-flow fan, comprising an impeller means having a predetermined axial length and including an impeller and a supporting member, and a hollow elongated casing having a circumferential wall, an inlet and an outlet axially spaced from said inlet and defining together with said circumferential wall the interior of said casing accommodating said impeller means, said interior having an axial length corresponding to said predetermined length of said impeller means, whereby substantially the whole axial length of the interior of the casing is taken up by said impeller means, said circumferential wall comprising a first conical annular portion adjacent to said inlet and diverging in the direction from said outlet to said inlet and defining the first maximum cross-sectional dimension of said interior at said inlet of the casing, a second conical annular portion adjacent to said outlet and diverging in the direction from said inlet to said outlet and defining the second maximum cross-sectional dimension of said interior at said outlet of the casing, and an intermediate portion interposed between said first conical annular portion and said second conical annular portion, said second maximum cross-sectional dimension of the casing exceeding said first maximum cross-sectional dimension from 1% to 4%.
Claim 7
Dependent Claim
18 words
A fan as defined in claim 3, wherein said casing is provided with end faces of quadrangular cross-section.
Claim 8
Dependent Claim
14 words
A fan as defined in claim 3, wherein said casing is a one-piece element.
Claim 9
Dependent Claim
15 words
A fan as defined in claim 3, wherein said intermediate portion has a cylindrical cross-section.
Claim 10
Dependent Claim
25 words
A fan as defined in claim 3, wherein said casing is provided with at least two recesses located axially along the length of the casing.
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) | 1983-09-30 | 1984-03-31 | 1984-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-30 | 1988-03-31 | 1988-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-30 | 1992-03-31 | 1992-09-30 | $7700.00 | Window Closed / Lapsed |