Patent US1170059A successfully refreshed from Google Patents.
Patent EP0122892A1 successfully refreshed from Google Patents.
EP0122892A1
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Method of producing a guide vane ring for a return flow passage in axial fans
Assignee: ABB Technology FLB AB
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Filing: 1984-03-09
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Granted: —
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Expires: 2004-03-09
Abstract
Abstract A guide vane ring for a return flow passage in axial fans comprises a ring (3) intended for placing in the return flow passage (4) coaxial with the impeller (6). A plurality of guide vanes (7) are formed integral with the ring and distributed round its exterior circumference. in a method of producing such a ring integral with its vanes, separate longitudinal slits are formed in a line one afterthe other in a metal strip. A cut is made transverse the strip between one end of each slit and one long edge of the strip. Portions of the band thus cut free are bent out from its plane and formed to a desired configuration, whereafter the formed band portions are bent such that the transverse cut lines will extend substantially at right-angles to the unformed flat band portion. This flat band portion is cut to desired length, formed and joined together into a circular ring with the portions formed to desired configuration forming exterior, substantially axially disposed guide vanes.
Inventors
- 👤 Sune Karlsson
- 👤 Torvald Holmqvist
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 17:45
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/40; F04D29/52; F04D29/54; F04D29/541; F04D29/545; F04D29/547; F04D29/66; F04D29/68; F04D29/681; F04D29/685; Y; Y10; Y10S; Y10S416/00; Y10S416/03; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/49327
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
47 words
A guide vane ring for a return flow passage in axial fans, characterized in that it comprises a ring intended for being placed in the return flow passage coaxial with the impeller, and a plurality of guide vanes integrally formed with the ring on its outer circumference.
Claim 2
Dependent Claim
47 words
A guide vane ring for a return flow passage in axial fans, characterized in that it comprises a ring intended for being placed in the return flow passage coaxial with the impeller, and a plurality of guide vanes integrally formed with the ring on its outer circumference.
Claim 3
Dependent Claim
37 words
Ring as claimed in claim 1, characterized in that the spacing between the guide vanes is equal to, or larger than, the length of each vane, the relationship spacing vane length preferably lying between 1.0 and 1.4.
Claim 4
Dependent Claim
24 words
Ring as claimed in claim I or 2, characterized in that the axially projected length of the vanes exceeds the width of the ring.
Claim 5
Dependent Claim
37 words
Ring as claimed in any of claims 1-3, characterized in that the vanes are implemented with a configuration giving the desired degree of rotation to recirculated air which is returned to the main flow towards the impeller.
Claim 6
Dependent Claim
32 words
Ring as claimed in any of claims 1 - 4, characterized in that the diameter of the ring somewhat exceeds, preferably by 1 - 5 X, the diameter of the impeller housing.
Claim 7
Dependent Claim
129 words
Method of producing a guide vane ring for a return flow passage in axial fans, characterized in that separate, longitudinally oriented slits are made in a metal strip, a cut is made transversely to the strip, between one end of each slit and one long edge of the strip, the portions of the strip thus cut loose being bent out of the plane of the strip and formed to a desired configuration, subsequent to which said formed band portions are folded such that the transverse cut lines will extend substantially at right-angles to the unformed flat strip portion, and in that said flat strip portion is cut to desired length, shaped and joined together to form a circular ring with the formed strip portions serving as exterior guide vanes.
Claim 8
Dependent Claim
129 words
Method of producing a guide vane ring for a return flow passage in axial fans, characterized in that separate, longitudinally oriented slits are made in a metal strip, a cut is made transversely to the strip, between one end of each slit and one long edge of the strip, the portions of the strip thus cut loose being bent out of the plane of the strip and formed to a desired configuration, subsequent to which said formed band portions are folded such that the transverse cut lines will extend substantially at right-angles to the unformed flat strip portion, and in that said flat strip portion is cut to desired length, shaped and joined together to form a circular ring with the formed strip portions serving as exterior guide vanes.
Claim 9
Dependent Claim
27 words
Method as claimed in claim 6, characterized in that each slit is formed with a length considerably exceeding the length of the strip portion separating successive slits.
Claim 10
Dependent Claim
27 words
Method as claimed in claim 7, characterized in that the slits are formed with a length, which is ten times the length of the separating strip portion.
Claim 11
Dependent Claim
43 words
Method as claimed in any of claims 6 - 8, characterized in that the slits are formed along a line at a greater distance from one longitudinal edge of the strip and that said transverse cut is made in the wider strip portion.
Claim 12
Dependent Claim
36 words
Method as claimed in any of claims 6 - 9, characterized in that the slit is formed with a width which is less than, preferably half of the length of, the band portion separating the slits.
References Cited (Backward Citations)
US2393933A
Cited
GB2101685A
Cited
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