US5538077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
In tank oil cooler
Assignee: Dana Canada Corp
•
Filing: 1995-01-09
•
Granted: 1996-07-23
•
Expires: 2015-01-09
Abstract
Abstract A heat exchanger and method of making same is disclosed. The heat exchanger is particularly useful for cooling automotive engine oil or transmission fluid, the exchanger being located inside the radiator or other part of the engine cooling system. The heat exchanger is made from a plurality of stacked plates formed of cladded metal, the plates being assembled into face-to-face pairs, each pair having a turbulizer located therein. The plates also have outwardly disposed dimples which are in contact when the plates are arranged back-to-back. The turbulizer is thicker than the spacing between the assembled plates prior to brazing the assembly, and a portion of the peripheral edges of the turbulizer is deformed or crimpled during assembly.
Inventors
- 👤 Allan K. So
- 👤 Nicholas F. Avery
- 👤 David G. Rowntree
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:37
CPC Classifications
F; F28; F28F; F28F3/00; F28F3/02; F28F3/04; F28D; F28D9/00; F28D9/0031; F28D9/0043; F28F13/00; F28F13/06; F28F13/12; F28F9/00; F28F9/02; F28F9/0234; F28D21/00; F28D2021/0019; F28D2021/008; F28D2021/0089; F28F2275/00; F28F2275/04; F28F2275/12; F28F2275/122; Y; Y10; Y10S; Y10S165/00; Y10S165/916
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
254 words
A heat exchanger comprising: a plurality of stacked plates arranged in face-to-face pairs, each of said face-to-face pairs including first and second plates, the first plate having a planar central portion, a raised peripheral edge portion located above and in a plane parallel to the central portion, a transition portion between the central and edge portions, and opposed end bosses located below and in a plane parallel to the central portion; the second plate of each face-to-face pair having a peripheral edge portion joined to said first plate peripheral edge portion, a central portion spaced from the first plate central portion, a transition portion between the central and edge portions, and opposed end bosses located above and in a plane parallel to the second plate central portion; the first and second plate central portions having opposed cladding layers formed thereon; a planar expanded metal turbulizer located between the first and second plates of each face-to-face plate pair, the thickness of the turbulizer being generally equal to the distance between the first and second plate central portions without the cladding layers; the first and second plate central portions having a plurality of spaced-apart, outwardly disposed dimples formed therein, the dimples extending equidistant with the end bosses; the first plate of one plate pair being located back-to-back with the second plate of an adjacent plate pair, the respective dimples and end bosses being joined together; and each plate pair defining inlet and outlet openings for the flow of fluid through the plate pair past the turbulizer.
Claim 2
Dependent Claim
254 words
A heat exchanger comprising: a plurality of stacked plates arranged in face-to-face pairs, each of said face-to-face pairs including first and second plates, the first plate having a planar central portion, a raised peripheral edge portion located above and in a plane parallel to the central portion, a transition portion between the central and edge portions, and opposed end bosses located below and in a plane parallel to the central portion; the second plate of each face-to-face pair having a peripheral edge portion joined to said first plate peripheral edge portion, a central portion spaced from the first plate central portion, a transition portion between the central and edge portions, and opposed end bosses located above and in a plane parallel to the second plate central portion; the first and second plate central portions having opposed cladding layers formed thereon; a planar expanded metal turbulizer located between the first and second plates of each face-to-face plate pair, the thickness of the turbulizer being generally equal to the distance between the first and second plate central portions without the cladding layers; the first and second plate central portions having a plurality of spaced-apart, outwardly disposed dimples formed therein, the dimples extending equidistant with the end bosses; the first plate of one plate pair being located back-to-back with the second plate of an adjacent plate pair, the respective dimples and end bosses being joined together; and each plate pair defining inlet and outlet openings for the flow of fluid through the plate pair past the turbulizer.
Claim 3
Dependent Claim
47 words
A heat exchanger as claimed in claim 1 wherein said inlet and outlet openings are formed in the respective opposed end bosses of each plate, so that in a stack of back-to-back plate pairs all inlet openings are in alignment and all outlet openings are in alignment.
Claim 4
Dependent Claim
27 words
A heat exchanger as claimed in claim 2 wherein the turbulizer is formed of a plurality of parallel rows of metal disposed in a sinusoidal, staggered arrangement.
Claim 5
Dependent Claim
19 words
A heat exchanger as claimed in claim 1 wherein the dimples are spaced uniformly over the plate central portions.
Claim 6
Dependent Claim
46 words
A heat exchanger as claimed in claim 1 wherein the dimples are dimensioned such that the area of the dimples not in contact with the turbulizer is minimized so as not to detract materially from the heat transfer between the turbulizer and the plate central portions.
Claim 7
Dependent Claim
17 words
A heat exchanger as claimed in claim 1 wherein the dimples are formed with generally flat tops.
Claim 8
Dependent Claim
25 words
A heat exchanger as claimed in claim 1 wherein the turbulizer is generally the same transverse width as the distance between the plate transition portions.
Claim 9
Dependent Claim
49 words
A heat exchanger as claimed in claim 1 wherein the dimples are arranged symmetrically about the longitudinal and transverse axes of the plates so that when two plate pairs are positioned back-to-back the dimples on the first plate will be in alignment with the dimples on the second plate.
Claim 10
Dependent Claim
22 words
A heat exchanger as claimed in claim 1 wherein the plates are formed of aluminum having a brazing cladding layer formed thereon.
Claim 11
Dependent Claim
21 words
A heat exchanger as claimed in claim 9 wherein the cladding layer is 10 percent of the thickness of the plate.
Claim 12
Dependent Claim
331 words
A heat exchanger comprising: a plurality of stacked plates arranged in face-to-face pairs, each of said face-to-face pairs including first and second plates, the first plate having a planar central portion, a raised peripheral edge portion located above and in a plane parallel to the central portion, a transition portion between the central and edge portions, and opposed end bosses located below and in a plane parallel to the central portion; the second plate of each face-to-face plate pair having a peripheral edge portion adapted to mate with first plate peripheral edge portion, a central portion spaced from the first plate central portion, a transition portion between the central and edge portions, and opposed end bosses located above and in a plane parallel to the second plate central portion; a planar turbulizer located between the first and second plates of each face-to-face plate pair, the thickness of the turbulizer being generally equal to the distance between the first and second plate central portions; the first and second plate central portions having a plurality of spaced-apart, outwardly disposed dimples formed therein, the dimples extending equidistant with the end bosses; the first plate of one plate pair being located back-to-back with the second plate of an adjacent plate pair, the respective dimples and end bosses being joined together; each plate pair defining inlet and outlet openings for the flow of fluid through the plate pair past a turbulizer; and the peripheral edge portions of each plate pair being joined together by a process comprising the steps of: arranging the plates of each plate pair with a hollow space therebetween; inserting the turbulizer into said hollow space, the turbulizer being of such thickness that the mating peripheral edge portions are spaced apart; heating and partially melting the plate pair while said mating peripheral edge portions are still spaced apart; and compressing the turbulizer by pressing the plate pair together thereby melting the turbulizer into said central portions drawing the mating peripheral edge portions together.
Claim 13
Dependent Claim
331 words
A heat exchanger comprising: a plurality of stacked plates arranged in face-to-face pairs, each of said face-to-face pairs including first and second plates, the first plate having a planar central portion, a raised peripheral edge portion located above and in a plane parallel to the central portion, a transition portion between the central and edge portions, and opposed end bosses located below and in a plane parallel to the central portion; the second plate of each face-to-face plate pair having a peripheral edge portion adapted to mate with first plate peripheral edge portion, a central portion spaced from the first plate central portion, a transition portion between the central and edge portions, and opposed end bosses located above and in a plane parallel to the second plate central portion; a planar turbulizer located between the first and second plates of each face-to-face plate pair, the thickness of the turbulizer being generally equal to the distance between the first and second plate central portions; the first and second plate central portions having a plurality of spaced-apart, outwardly disposed dimples formed therein, the dimples extending equidistant with the end bosses; the first plate of one plate pair being located back-to-back with the second plate of an adjacent plate pair, the respective dimples and end bosses being joined together; each plate pair defining inlet and outlet openings for the flow of fluid through the plate pair past a turbulizer; and the peripheral edge portions of each plate pair being joined together by a process comprising the steps of: arranging the plates of each plate pair with a hollow space therebetween; inserting the turbulizer into said hollow space, the turbulizer being of such thickness that the mating peripheral edge portions are spaced apart; heating and partially melting the plate pair while said mating peripheral edge portions are still spaced apart; and compressing the turbulizer by pressing the plate pair together thereby melting the turbulizer into said central portions drawing the mating peripheral edge portions together.
Claim 14
Dependent Claim
22 words
A heat exchanger as claimed in claim 11 wherein the plates are formed of aluminum having a brazing cladding layer formed thereon.
Claim 15
Dependent Claim
27 words
A heat exchanger as claimed in claim 12 wherein the turbulizer is formed of a plurality of parallel rows of metal disposed in a sinusoidal, staggered arrangement.
Claim 16
Dependent Claim
32 words
A heat exchanger as claimed in claim 12 wherein the thickness of the turbulizer is generally equal to the distance between the first and second plate central portions without the cladding layers.
Claim 17
Dependent Claim
15 words
A heat exchanger as claimed in claim 13 wherein the turbulizer is formed of aluminum.
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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) | 1999-07-23 | 2000-01-22 | 2000-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-07-23 | 2004-01-22 | 2004-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-07-23 | 2008-01-22 | 2008-07-23 | $7700.00 | Window Closed / Lapsed |