Patent US5889828A successfully refreshed from Google Patents.
Patent US4593756A successfully refreshed from Google Patents.
US4593756A
Expired / Lapsed
US
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Fin-and-tube type heat exchanger
Assignee: Hitachi Ltd
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Filing: 1985-06-20
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Granted: 1986-06-10
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Expires: 2005-06-20
Abstract
Abstract A fin-and-tube type heat exchanger is disclosed in which the height of each raised, slotted louver from a fin base portion continuously changes in a direction crossing at right angles both the direction of the air flow and the direction of lamination of fins, and two or three kinds of such louver pairs, each consisting of louvers symmetric with each other with respect to the fin base portion, are arranged regularly.
Inventors
- 👤 Masaaki Itoh
- 👤 Hiroshi Kogure
- 👤 Kenji Iino
- 👤 Izumi Ochiai
- 👤 Yukio Kitayama
- 👤 Masahiro Miyagi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:59
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/24; F28F1/32; F28F1/325; Y; Y10; Y10S; Y10S165/00; Y10S165/454; Y10S165/50; Y10S165/501; Y10S165/502; Y10S165/503
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
194 words
In a fin-and-tube type heat exchanger of the type which includes a large number of plate fins laminated in parallel with one another with a predetermined pitch p between them, a plurality of heat transfer tubes penetrating through said fins, and a large number of louvers disposed on said plate fins in such a manner as to extend in the longitudinal direction crossing at right angles both the direction of the air flow and the direction of lamination of said plate fins, the improvement wherein the cut-up height H of each of said raised, slotted louvers from the surface of a fin substrate continuously changes throughout the longitudinal direction of said louver in such a fashion that the greatest value of said height H is 1/2 of a fin pitch P and the smallest value is zero, four to six kinds of louvers having different change patterns are disposed, said louvers consist of two to three kinds of louver pairs whose cut-up height H is symmetrical with respect to said fin substrate surface, and said two to three kinds of louver pairs are disposed sequentially and repeatedly in the direction of the air flow.
Claim 2
Dependent Claim
194 words
In a fin-and-tube type heat exchanger of the type which includes a large number of plate fins laminated in parallel with one another with a predetermined pitch p between them, a plurality of heat transfer tubes penetrating through said fins, and a large number of louvers disposed on said plate fins in such a manner as to extend in the longitudinal direction crossing at right angles both the direction of the air flow and the direction of lamination of said plate fins, the improvement wherein the cut-up height H of each of said raised, slotted louvers from the surface of a fin substrate continuously changes throughout the longitudinal direction of said louver in such a fashion that the greatest value of said height H is 1/2 of a fin pitch P and the smallest value is zero, four to six kinds of louvers having different change patterns are disposed, said louvers consist of two to three kinds of louver pairs whose cut-up height H is symmetrical with respect to said fin substrate surface, and said two to three kinds of louver pairs are disposed sequentially and repeatedly in the direction of the air flow.
Claim 3
Dependent Claim
27 words
The fin-and-tube type heat exchanger as defined in claim 1 wherein each of said louvers consists of a plane parallel to the direction of the air flow.
References Cited (Backward Citations)
FR472122A
Cited
US2246258A
Cited
US3135320A
Cited
US3380518A
Cited
US3437134A
Cited
US3438433A
Cited
JPS5625694A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-09 | 1989-12-09 | 1990-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-09 | 1993-12-09 | 1994-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-09 | 1997-12-09 | 1998-06-10 | $7700.00 | Window Closed / Lapsed |