# US 2018/0320981 A1 · Heat exchanger > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0320981 A1 - Document ID: US20180320981A1 - Status: Published application - Kind: A1 - Application number: 15/907,316 - Filed: 2018-02-28 - Published: 2018-11-08 - Earliest claimed: 2017-05-02 - Assignees: Hs Marston Aerospace Limited - Applicants: HS Marston Aerospace Limited - Inventors: Jacob DIFFEY - Web page: https://patentgrep.com/patent/US20180320981A1 ## CPC - F28D 9/0093: {Multi-circuit heat-exchangers, e.g. integrating different heat exchange sections in the same unit or heat-exchangers for more than two fluids} - F01M 5/002: {Cooling} - F01M 5/005: {Controlling temperature of lubricant} - F01M 5/021: {by heating} - F28F 3/025: {the means being corrugated, plate-like elements} - F28F 3/027: {with openings, e.g. louvered corrugated fins; Assemblies of corrugated strips} - F28F 3/08: Elements constructed for building-up into stacks, e.g. capable of being taken apart for cleaning - F28F 17/00: Removing ice or water from heat-exchange apparatus - F28F 19/006: {Preventing deposits of ice} - F28D 2021/0089: {Oil coolers} - 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) - F01M: LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING - F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16) ## Abstract A heat exchanger and a method for manufacturing a heat exchanger, the heat exchanger comprising: a first plurality of layers, each of the first plurality of layers including: a corrugated sheet comprising a series of regular corrugations across its width for flow of liquid therethrough, the series of corrugations having a predetermined period; and a de-congealing channel for flow of liquid across the width of the corrugated sheet in parallel with the corrugations, the de-congealing channel formed at least in part by two adjacent corrugations, that are separated by greater than the predetermined period. ## Claims ### Claim 1 A heat exchanger comprising: a first plurality of layers, each of the first plurality of layers including: a corrugated sheet comprising a series of regular corrugations across its width for flow of liquid therethrough, the series of corrugations having a predetermined period; and a de-congealing channel for flow of liquid across the width of the corrugated sheet in parallel with the corrugations, the de-congealing channel formed at least in part by two adjacent corrugations that are separated by greater than the predetermined period. ### Claim 2 (depends on 1) A heat exchanger as claimed in claim 1, wherein each corrugation has an oscillating geometry along the length of the corrugation across the width of the corrugated sheet. ### Claim 3 (depends on 1) A heat exchanger as claimed in claim 1, wherein each corrugation comprises an opening for fluid communication between the corrugations. ### Claim 4 (depends on 1) A heat exchanger as claimed in claim 1, comprising a plurality of fins for intercepting or directing a flow of liquid through the corrugation. ### Claim 5 (depends on 1) A heat exchanger as claimed claim 1, wherein the de-congealing channel forms a throughway from one side to the other side of each layer of the first plurality of layers that is larger than throughways formed by the corrugations. ### Claim 6 (depends on 1) A heat exchanger as claimed in claim 1, further comprising a second plurality of layers for flow of a fluid therethrough, the heat exchanger comprising alternating layers from the first and second pluralities of layers. ### Claim 7 (depends on 1) A heat exchanger as claimed in claim 1, wherein the layers of the second plurality of layers prevent flow of liquid between the layers of the first plurality of layers. ### Claim 8 (depends on 1) A heat exchanger as claimed in claim 1, comprising a separator between layers of the heat exchanger for preventing fluid flow between those layers. ### Claim 9 (depends on 1) A heat exchanger as claimed in claim 1, wherein the de-congealing channel of each layer of the first plurality of layers is aligned with the de-congealing channel of one of the nearest other layers of the first plurality of layers. ### Claim 10 (depends on 1) A heat exchanger as claimed in claim 1, wherein the de-congealing channel of each layer of the first plurality of layers is not aligned with the de-congealing channel of one of the nearest other layers of the first plurality of layers. ### Claim 11 (depends on 1) A heat exchanger as claimed in claim 1, wherein the series of corrugations is in the form of a waveform. ### Claim 12 A method of manufacturing a heat exchanger, comprising: forming a layer of the heat exchanger by stamping a series of regular corrugations with a predetermined period into a metal sheet, and skipping a corrugation stamping step so as to create a space between two adjacent corrugations which are thus separated by greater than the predetermined period, and thereby create at least a part of a de-congealing channel. ### Claim 13 (depends on 12) A method as claimed in claim 12, wherein the step of forming a layer of the heat exchanger by stamping the metal sheet comprises stamping the sheet in a first upward direction and in a second downward direction so as to form the corrugations. ### Claim 14 (depends on 12) A method as claimed in claim 12, comprising repeating the step of forming a layer so as to form a first plurality of layers for a flow of oil therethrough, providing a second plurality of layers for a flow of fluid therethrough, and forming the heat exchanger by alternating layers of the first and second pluralities of layers so that in use oil in the first plurality of layers is in a heat exchanging relationship with fluid in the second plurality of layers. ### Claim 15 (depends on 14) A method as claimed in claim 14, wherein forming the heat exchanger comprises providing intervening separators between the layers of the first plurality of layers.