Patent US4423772A successfully refreshed from Google Patents.
US4423772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plate heat exchanger
Assignee: Alfa Laval AB
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Filing: 1981-08-19
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Granted: 1984-01-03
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Expires: 2001-08-19
Abstract
Abstract A heat exchanger comprises a plurality of plates arranged adjacent to each other and provided with mutually corssing corrugation patterns of ridges and grooves which form supporting areas in which the plates abut each other. According to the invention, at least some of the heat exchange passages are defined by plates at least one of which has recessed supporting areas, whereby the volume of the passage is reduced.
Inventors
- 👤 Jons A. Dahlgren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:09
CPC Classifications
F; F28; F28D; F28D9/00; F28D9/0031; F28D9/0037; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/356; Y10S165/393; Y10S165/394
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
172 words
A plate heat exchanger comprising a plurality of generally rectangular plates arranged adjacent to each other to form a flow passage between each pair of adjacent plates, each of said plates having a turbulence-generating corrugation pattern of alternating ridges and grooves which on adjacent plates extend in different directions, the grooves on one side of each plate forming corresponding ridges on the other side of said plate, each ridge on one side of each plate crossing and abutting a plurality of ridges on the opposing side of an adjacent plate to form interplate supporting areas spaced along the length of said each ridge, said supporting areas alternating with unsupported areas spaced along the length of said each ridge, the exchanger being characterized in that in some of said flow passages at least one of the plates defining the passage has said supporting areas recessed in a lower plane in ridges of said one plate, whereby the volumes of said some flow passages are reduced relative to the volumes of the other passages.
Claim 2
Dependent Claim
172 words
A plate heat exchanger comprising a plurality of generally rectangular plates arranged adjacent to each other to form a flow passage between each pair of adjacent plates, each of said plates having a turbulence-generating corrugation pattern of alternating ridges and grooves which on adjacent plates extend in different directions, the grooves on one side of each plate forming corresponding ridges on the other side of said plate, each ridge on one side of each plate crossing and abutting a plurality of ridges on the opposing side of an adjacent plate to form interplate supporting areas spaced along the length of said each ridge, said supporting areas alternating with unsupported areas spaced along the length of said each ridge, the exchanger being characterized in that in some of said flow passages at least one of the plates defining the passage has said supporting areas recessed in a lower plane in ridges of said one plate, whereby the volumes of said some flow passages are reduced relative to the volumes of the other passages.
Claim 3
Dependent Claim
26 words
The exchanger of claim 1, in which in at least a portion of the exchanger only every other plate is provided with said recessed supporting areas.
Claim 4
Dependent Claim
24 words
The exchanger of claim 1, in which in at least a portion of the exchanger each plate is provided with said recessed supporting areas.
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) | 1987-01-02 | 1987-07-04 | 1988-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-02 | 1991-07-04 | 1992-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-02 | 1995-07-04 | 1996-01-03 | $7700.00 | Window Closed / Lapsed |