Patent US6298910B1 successfully refreshed from Google Patents.
US6298910B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aluminum-made heat exchanger with brazed joint portion
Assignee: Denso Corp
•
Filing: 2000-09-25
•
Granted: 2001-10-09
•
Expires: 2020-09-25
Abstract
Abstract A heat exchanger has a core portion composed of several pairs of first and second plates laminated with and brazed to one another. Each of the first and second plates is composed a core member, a brazing filler layer formed on a surface of the core member, and a sacrifice layer formed on the other surface of the core member. For instance, to form a pair of the first and second plates, the first plate is formed with a convex portion with an opening portion, and a burring portion of the second plate is inserted into the opening portion and is plastically deformed such that the sacrifice layer of the second plate closely contacts the brazing filler metal layer of the first plate. Then the first and the second plates are brazed together.
Inventors
- 👤 Shuji Komoda
- 👤 Hisashi Nakashima
- 👤 Shinichi Hamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:58
CPC Classifications
F; F28; F28F; F28F19/00; F28F19/02; F28F19/06; B; B23; B23K; B23K1/00; B23K1/0008; B23K1/0012; F16; F16N; F16N39/00; F16N39/02; F28D; F28D9/00; F28D9/0031; F28D9/0043; F28F21/00; F28F21/08; F28F21/081; F28F21/084; F28F21/089; B23K2101/00; B23K2101/04; B23K2101/14; B23K2103/00; B23K2103/08; B23K2103/10; F28D21/00; F28D2021/0019; F28D2021/008; F28D2021/0089; F28F2275/00; F28F2275/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
226 words
A heat exchanger comprising: a first plate made of aluminum material and having a first brazing filler metal layer on a first surface thereof and a first sacrifice layer on a second surface thereof, the first brazing filler metal layer having a melting point lower than that of the first plate, the first sacrifice layer having a corrosion resistance inferior to that of the first plate; and a second plate made of aluminum material and having a second brazing filler metal layer on a first surface thereof, and a second sacrifice layer on a second surface thereof, the second brazing filler metal layer having a melting point lower than that of the second plate, the second sacrifice layer having a corrosion resistance inferior to that of the second plate, wherein: the second plate is laminated with the first plate in a plate thickness direction of the first and second plates, and is brazed to the first plate at a joint portion to form a passage therebetween with the first sacrifice layer and the second sacrifice layer facing each other and defining the passage as passage walls; and the second plate is plastically deformed such that the first brazing filler metal layer is laminated with the second sacrifice layer at the joint portion in the plate thickness direction of the first and second plates forming the passage.
Claim 2
Dependent Claim
226 words
A heat exchanger comprising: a first plate made of aluminum material and having a first brazing filler metal layer on a first surface thereof and a first sacrifice layer on a second surface thereof, the first brazing filler metal layer having a melting point lower than that of the first plate, the first sacrifice layer having a corrosion resistance inferior to that of the first plate; and a second plate made of aluminum material and having a second brazing filler metal layer on a first surface thereof, and a second sacrifice layer on a second surface thereof, the second brazing filler metal layer having a melting point lower than that of the second plate, the second sacrifice layer having a corrosion resistance inferior to that of the second plate, wherein: the second plate is laminated with the first plate in a plate thickness direction of the first and second plates, and is brazed to the first plate at a joint portion to form a passage therebetween with the first sacrifice layer and the second sacrifice layer facing each other and defining the passage as passage walls; and the second plate is plastically deformed such that the first brazing filler metal layer is laminated with the second sacrifice layer at the joint portion in the plate thickness direction of the first and second plates forming the passage.
Claim 3
Dependent Claim
41 words
The heat exchanger according to claim 1 , wherein the first plate is plastically deformed such that the first brazing filler metal layer is laminated with the second brazing filler metal layer in the plate thickness direction at the joint portion.
Claim 4
Dependent Claim
57 words
The heat exchanger according to claim 1 , wherein: the first plate has an opening portion; the second plate has a burring portion that is inserted into the opening portion and is plastically deformed to have a generally U-shaped cross-section; and the joint portion is composed a peripheral portion of the opening portion and the burring portion.
Claim 5
Dependent Claim
62 words
The heat exchanger according to claim 1 , wherein: the first surfaces of the first plate and the second plate are respectively clad with the first brazing filler metal layer and the second brazing filler metal layer; and the second surfaces of the first plate and the second plate are respectively clad with the first sacrifice layer and the second sacrifice layer.
Claim 6
Dependent Claim
84 words
The heat exchanger according to claim 1 , wherein: the first plate forms the passage with the second plate as a first fluid passage in which a first fluid flows, and forms a second fluid passage, in which a second fluid flows, at an opposite side of the second plate; and the first sacrifice layer is exposed to the first fluid passage having a corrosion environment harsher than that of the second fluid passage to which the first brazing filler metal layer is exposed.
Claim 7
Dependent Claim
49 words
The heat exchanger according to claim 5 , wherein: the first fluid flowing in the first fluid passage is cooling water for cooling a vehicle engine; and the second fluid flowing in the second fluid passage is oil that is one of engine oil, transmission oil, power steering oil.
Claim 8
Dependent Claim
40 words
The heat exchanger according to claim 1 , wherein the plate thickness direction of the first plate and the second plate forming the passage is approximately parallel to a plate thickness direction of the second plate forming the joint portion.
Claim 9
Dependent Claim
235 words
A heat exchanger comprising: a first plate composed of a first core member made of aluminum material, a first brazing filler metal layer provided on a first surface of the first core member with a melting point lower than that of the first core member, and a first sacrifice layer provided on a second surface of the first core member with a corrosion resistance inferior to that of the first core member; and a second plate composed of a second core member made of aluminum material, a second brazing filler metal layer provided on a first surface of the second core member with a melting point lower than that of the second core member, and a second sacrifice layer provided on a second surface of the second core member with a corrosion resistance inferior to that of the second core member, wherein: the first plate is stacked with the second plate in a lamination direction of the first plate to form a fluid passage therebetween, and joined to the second plate at a joint portion; the first brazing filler metal layer of the first plate is stacked with and directly brazed to the second plate in the lamination direction at the joint portion; the first plate has a generally U-shaped edge portion forming the joint portion; and the first brazing filler metal layer is directly brazed to the second sacrifice layer at the joint portion.
Claim 10
Dependent Claim
235 words
A heat exchanger comprising: a first plate composed of a first core member made of aluminum material, a first brazing filler metal layer provided on a first surface of the first core member with a melting point lower than that of the first core member, and a first sacrifice layer provided on a second surface of the first core member with a corrosion resistance inferior to that of the first core member; and a second plate composed of a second core member made of aluminum material, a second brazing filler metal layer provided on a first surface of the second core member with a melting point lower than that of the second core member, and a second sacrifice layer provided on a second surface of the second core member with a corrosion resistance inferior to that of the second core member, wherein: the first plate is stacked with the second plate in a lamination direction of the first plate to form a fluid passage therebetween, and joined to the second plate at a joint portion; the first brazing filler metal layer of the first plate is stacked with and directly brazed to the second plate in the lamination direction at the joint portion; the first plate has a generally U-shaped edge portion forming the joint portion; and the first brazing filler metal layer is directly brazed to the second sacrifice layer at the joint portion.
Claim 11
Dependent Claim
27 words
The heat exchanger according to claim 8 , wherein the first sacrifice layer and the second sacrifice layer are exposed to the fluid passage as passage walls.
References Cited (Backward Citations)
US5099912A
Cited
JPH06170519A
Cited
US5292595A
Cited
US5744255A
Cited
EP0712681A2
Cited
US5720340A
Cited
EP0843146A2
Cited
JPH10185462A
Cited
US5979542A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2004-10-08 | 2005-04-09 | 2005-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-10-08 | 2009-04-09 | 2009-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-10-08 | 2013-04-09 | 2013-10-09 | $7700.00 | Window Closed / Lapsed |