# US 7,610,949 B2 · Heat exchanger with bypass > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,610,949 B2 - Document ID: US7610949B2 - Status: Granted - Kind: B2 - Application number: 11/559,042 - Filed: 2006-11-13 - Published: 2008-05-15 - Granted: 2009-11-03 - Earliest claimed: 2006-11-13 - Assignees: Dana Canada Corporation - Inventors: Herve Palanchon - Web page: https://patentgrep.com/patent/US7610949B2 ## CPC - F28D 9/0043: {the plates having openings therein for circulation of at least one heat-exchange medium from one conduit to another} - F02M 26/25: with coolers having bypasses - F02M 26/32: Liquid-cooled heat exchangers - F28D 9/0056: {with U-flow or serpentine-flow inside conduits; with centrally arranged openings on the plates} - F28F 9/0219: {Arrangements for sealing end plates into casing or header box; Header box sub-elements (F28F9/0236 takes precedence)} - F28D 21/0003: {the heat being recuperated from exhaust gases (F28D21/0014 takes precedence)} - F28F 2250/06: Derivation channels, e.g. bypass - F28F 2250/108: with combined cross flow and parallel flow - F28D: HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT (fluid heaters having heat generating means and heat transferring means F24H; furnaces F27; details of heat-exchange apparatus of general) - F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF - F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16) ## Abstract A heat exchanger with an external bypass is formed by a core portion including a plurality of stacked tubular members and a corrugated bypass tube positioned substantially parallel to the core portion. A first set of flow passages is defined within the tubular members for the flow of a first fluid therethrough, and a second set of flow passages is defined between adjacent tubular members as the tubular members are stacked together to form the core portion. A pair of external end plates is sealingly attached to transverse end wall portions of the stacked tubular members and to the ends of the bypass tube thereby forming the heat exchanger with an external bypass that comprises a single unit that can be brazed or joined together in a single operation. ## Claims ### Claim 1 A heat exchanger, comprising: a plurality of stacked tubular members defining a first set of flow passages therethrough, the tubular members having a boss portion located at each end thereof, said boss portions defining respective inlet and outlet openings, the respective inlet and outlet openings of each of said stacked tubular members communicating to define inlet and outlet manifolds for the flow of a first fluid through the first set of flow passages, the tubular members having opposed peripheral flange portions joined together in the stacked tubular members to define a second set of flow passages between adjacent tubular members for the flow of a second fluid through the heat exchanger, the tubular members having transverse end wall portions defining a sealing surface; a corrugated bypass tube located generally parallel to the plurality of stacked tubular members, the corrugated bypass tube being exposed to ambient air and having opposed end portions defining open ends for the flow of additional second fluid therethrough; a pair of external end plates located respectively at the ends of the stacked tubular members and the corrugated bypass tube, each end plate having a peripheral wall defining a first opening for allowing said second fluid to flow through said second set of flow passages, the peripheral wall being sealingly attached to the transverse end wall portions of the plurality of stacked tubular members, and each end plate defining a second opening sealingly attached to one of the end portions of the corrugated bypass tube. ### Claim 2 (depends on 1) The heat exchanger as claimed in claim 1, wherein the bypass tube opposed end portions are located in the end plate second openings. ### Claim 3 (depends on 2) The heat exchanger as claimed in claim 2, wherein the boss portions are located to one side of the longitudinal axis of the tubular members. ### Claim 4 (depends on 1) The heat exchanger as claimed in claim 1, wherein the plurality of stacked tubular members are formed with a plurality of spaced apart, inwardly disposed dimples. ### Claim 5 (depends on 1) The heat exchanger as claimed in claim 1, wherein the plurality of stacked tubular members have inwardly disposed ribs for directing the flow of said first fluid through said first set of flow channels from the inlet opening to said outlet opening. ### Claim 6 (depends on 1) The heat exchanger as claimed in claim 1, wherein the transverse end wall portions close off a portion of the second set of flow passages, and wherein the end plate peripheral wall overlaps said end wall portions of said tubular members to form lap joints. ### Claim 7 (depends on 1) The heat exchanger as claimed in claim 1, further comprising turbulizers located in the second set of flow passages defined between the adjacent tubular members. ### Claim 8 (depends on 1) The heat exchanger as claimed in claim 1, wherein the ends of the tubular members have spaced-apart projecting tabs extending outwardly therefrom, said end plates being received between said tabs. ### Claim 9 (depends on 1) The heat exchanger as claimed in claim 1, wherein the tubular members are formed from elongate plate pairs. ### Claim 10 (depends on 9) The heat exchanger as claimed in claim 9, wherein each plate comprises: a central generally planar portion, said boss portions being located on one side of the longitudinal axis of the plate and extending slightly beyond the boundary of the central, generally planar portion, said boss portions lying in a different plane than said central planar portion; a first flange portion formed around the periphery of the plate, inwardly disposed from the edges thereof, said first flange portion lying in a different plane than said central planar portion and said boss portions; a second flange portion formed along the longitudinal edges of said plate, said second flange portion lying in the same plane as said boss portions. ### Claim 11 (depends on 10) The heat exchanger as claimed in claim 10, wherein each plate is inverted and rotated 180 degrees with respect to the adjacent plate to form the plate pairs. ### Claim 12 (depends on 10) The heat exchanger as claimed in claim 10, wherein said central generally planar portion includes spaced apart inwardly disposed dimples. ### Claim 13 (depends on 10) The heat exchanger as claimed in claim 10, wherein said central generally planar portion includes inwardly disposed guide ribs for directing the flow of said first fluid longitudinally through said first set of flow channels from the inlet opening to said outlet opening. ### Claim 14 (depends on 1) The heat exchanger as claimed in claim 1 wherein the bypass tube is spaced from the stacked tubular members. ### Claim 15 (depends on 1) The heat exchanger as claimed in claim 1 wherein at least one of the bypass tube corrugations is in contact with the stacked tubular members. ### Claim 16 (depends on 15) The heat exchanger as claimed in claim 15 wherein said at least one corrugation is brazed to the stacked tubular members. ### Claim 17 (depends on 15) The heat exchanger as claimed in claim 15 wherein said at least one corrugation is not brazed to the stacked tubular members. ### Claim 18 (depends on 1) The heat exchanger as claimed in claim 1 wherein the plurality of stacked tubular members include top and bottom tubular members, the top and bottom tubular members including respectively a top plate and a bottom plate, the top and bottom plates including opposed transverse end walls located in the same plane as the tubular member transverse end wall portions, said end walls being sealingly attached respectively to the end plate peripheral walls. ### Claim 19 (depends on 18) The heat exchanger as claimed in claim 18 wherein the top and bottom plate transverse end walls and the tubular member transverse end wall portions form a continuous peripheral sealing surface attached to the end plate peripheral walls in a lap joint configuration. ### Claim 20 (depends on 10) The heat exchanger as claimed in claim 10 wherein the external end plates have spaced-apart, laterally projecting side tabs, the second flange portions of the tubular members being retained in position by said side tabs.