# US 11,994,349 B2 · Bulkhead heat exchanger > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,994,349 B2 - Document ID: US11994349B2 - Status: Granted - Kind: B2 - Application number: 17/627,011 - Filed: 2020-06-26 - Published: 2022-08-18 - Granted: 2024-05-28 - Earliest claimed: 2019-07-29 - Assignees: Fujitsu General Limited - Applicants: Fujitsu General Limited - Inventors: Gaiken O; Akira Koizumi; Toshihiko Takahashi - Web page: https://patentgrep.com/patent/US11994349B2 ## CPC - F28D 9/0062: {the conduits for one heat-exchange medium being formed by spaced plates with inserted elements (F28D9/0012, F28D9/0025, F28D9/0081, F28D9/04 take precedence)} - F28F 3/06: the means being attachable to the element - F28D 9/005: {the plates having openings therein for both heat-exchange media} - F28D 9/02: the heat-exchange media travelling at an angle to one another (F28D9/04 takes precedence) - 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 13/08: by varying the cross-section of the flow channels - 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) - F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16) ## Abstract A bulkhead heat exchanger includes path walls which divide a space formed between a first bulkhead and a second bulkhead into first paths. The first bulkhead and the second bulkhead separate the first paths from second paths. When a phase overlapping an inflection point of one path wall of adjacent path walls is θ0 (=0°), the path wall is a sinusoidal path wall having a range of θ0 (=0°)<θ1<θ2<90°<θ3<θ4<180°<θ5<θ6<270°<θ7<θ8<θ0 (=360°) as one period. In the one path wall, a main element is formed in θ1≤θ<θ3 and θ6≤θ<θ8, and in the other path wall, a main element is formed in θ2≤θ<θ4 and θ5≤θ<θ7. ## Claims ### Claim 1 A bulkhead heat exchanger comprising: a first bulkhead; a second bulkhead; and a plurality of flow path walls which divide a space formed between the first bulkhead and the second bulkhead into a plurality of first flow paths, wherein the first bulkhead and the second bulkhead separate the plurality of first flow paths from a second flow path through which a second fluid different from a first fluid flowing through the plurality of first flow paths flows, a plurality of wall surfaces are formed on the plurality of flow path walls, each of the plurality of wall surfaces conforms to a sine curve at different positions, two adjacent flow path walls among a plurality of sinusoidal flow path walls arranged in an amplitude direction of the sine curve are sinusoidal flow path walls having a phase range of θ0 (=0°)<θ1<θ2<90°<θ3<θ4<180°<θ5<θ6<270°<θ7<θ8<θ0 (=360°) as one period when a phase overlapping an inflection point of a sine curve of one flow path wall is θ0 (=0°), in the one flow path wall, a main flow path wall element is formed in a portion overlapping a range of a phase θ of θ1≤θ<θ3 and θ6≤θ<θ8 by forming a notch which does not have a flow path wall in a portion overlapping a range of a phase θ of θ0≤θ<θ1 and θ8≤θ<θ0 and forming an in-element notch which does not have a flow path wall formed in a portion overlapping a range of a phase θ of θ3≤θ<θ6, in an other flow path wall, a main flow path wall element is formed in a portion overlapping a range of a phase θ of θ2≤θ<θ4 and θ5≤θ<θ7 by forming a notch which does not have a flow path wall formed in a portion overlapping a range of a phase θ of θ0≤θ<θ2 and θ7≤θ<θ0 and forming an in-element notch which does not have a flow path wall formed in a portion overlapping a range of a phase θ of θ4≤θ<θ5, and one flow path of the plurality of first flow paths is connected, via the notches and the in-element notches formed on the one flow path wall and the other flow path wall of the plurality of flow path walls, to two adjacent flow paths arranged respectively on both sides of the one flow path of the plurality of first flow paths. ### Claim 2 (depends on 1) The bulkhead heat exchanger according to claim 1, wherein the main flow path wall element of the one flow path wall includes a first sub flow path wall element which is formed in a portion overlapping the range of the phase θ of θ1≤θ<θ3 and a second sub flow path wall element which is formed in a portion overlapping the range of the phase θ of θ6≤θ<θ8, and the main flow path wall element of the other flow path wall includes a first sub flow path wall element which is formed in a portion overlapping the range of the phase θ of θ2≤θ<θ4, and a second sub flow path wall element formed in a portion overlapping the range of the phase θ of θ5≤θ<θ7. ### Claim 3 (depends on 1) The bulkhead heat exchanger according to claim 1, wherein each of the plurality of flow path walls includes a first wall surface, and a second wall surface which is formed on a side opposite to the first wall surface, the sine curves include a first sine curve and a second sine curve, the first wall surface conforms to the first sine curve and the second wall surface conforms to the second sine curve, a period and an amplitude of the first sine curve are equal to a period and an amplitude of the second sine curve, and the first sine curve and the second sine curve are located at positions translated by a predetermined offset value in respective amplitude directions. ### Claim 4 (depends on 1) The bulkhead heat exchanger according to claim 1, wherein the main flow path wall element of the one flow path includes a first sub flow path wall element formed in a portion overlapping a range of a phase θ of θ1≤θ<θ3, a second sub flow path wall element formed in a portion overlapping a range of a phase θ of θ6≤θ<θ8, and an intermediate flow path wall element which is disposed in an in-element notch which does not have a flow path wall formed in a portion overlapping a range of a phase θ of θ3≤θ<θ6, and the main flow path wall element of the other flow path wall includes a first sub flow path wall element formed in a portion overlapping a range of a phase θ of θ2≤θ<θ4, a second sub flow path wall element formed in a portion overlapping a range of a phase θ of θ5≤θ<θ7, and an intermediate flow path wall element which is disposed in an in-element notch which does not have a flow path wall formed in a portion overlapping a range of a phase θ of θ4≤θ<θ5. ### Claim 5 (depends on 4) The bulkhead heat exchanger according to claim 4, wherein the first sub flow path wall element and the second sub flow path wall element in the main flow path wall element is formed so that a width thereof is gradually reduced from an intermediate portion of the first and second sub flow path wall elements toward an end adjacent to the notch. ### Claim 6 (depends on 1) The bulkhead heat exchanger according to claim 1, wherein each of the plurality of flow path walls includes a first wall surface, and a second wall surface which is formed on a side opposite to the first wall surface, the sine curves include a first sine curve and a second sine curve, the first wall surface conforms to a first sine curve and the second wall surface conforms to a second sine curve, a period of the first sine curve is equal to a period of the second sine curve, an amplitude of the first sine curve is smaller than an amplitude of the second sine curve, and the first sine curve and the second sine curve intersect each other at respective inflection points. ### Claim 7 (depends on 1) The bulkhead heat exchanger according to claim 1, further comprising a sidewall which forms a sidewall surface on an end of the space, wherein the sidewall surface conforms to another sine curve having a same period as that of the sine curves. ### Claim 8 (depends on 1) The bulkhead heat exchanger according to claim 1, wherein a value obtained by dividing a minimum value of an interval between the plurality of flow path walls by an interval between the first bulkhead and the second bulkhead is larger than 2.5 and smaller than 6.