US 11,913,732 B2
Bulkhead heat exchanger including heat transfer surfaces having improved heat transfer performance
Gaiken O, Kanagawa (JP); Toshihiko Takahashi, Kanagawa (JP); and Akira Koizumi, Kanagawa (JP)
Assigned to FUJITSU GENERAL LIMITED, Kanagawa (JP)
Appl. No. 16/976,223
Filed by FUJITSU GENERAL LIMITED, Kanagawa (JP)
PCT Filed Jan. 24, 2019, PCT No. PCT/JP2019/002358
§ 371(c)(1), (2) Date Aug. 27, 2020,
PCT Pub. No. WO2019/167491, PCT Pub. Date Sep. 6, 2019.
Claims priority of application No. 2018-035321 (JP), filed on Feb. 28, 2018.
Prior Publication US 2021/0003351 A1, Jan. 7, 2021
Int. Cl. F28F 3/02 (2006.01); F28D 9/00 (2006.01); F28F 3/04 (2006.01)
CPC F28F 3/025 (2013.01) [F28D 9/0068 (2013.01); F28F 3/048 (2013.01); F28F 2260/02 (2013.01)] 9 Claims
OG exemplary drawing
 
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 adjacent first flow paths,
wherein the first bulkhead and the second bulkhead separate the plurality of first flow paths from second flow paths through which a second fluid different from a first fluid flowing through the plurality of first flow paths flows,
the plurality of flow path walls have a plurality of wall surfaces,
the plurality of wall surfaces conform to sine curves different in position from each other, respectively,
each of the plurality of flow path walls is divided into a plurality of flow path wall elements by forming a plurality of notches at each period of the sine curves, the plurality of notches overlapping inflection points of the sine curves,
each of the plurality of flow path wall elements is further divided into a plurality of other flow path wall elements by forming an in-element notch, and the in-element notch overlaps another inflection point of the sine curves which is different from the inflection points where the notches overlap,
each of the other flow path wall elements is formed not to overlap the inflection points of the sine curves and to overlap either maximum points or minimum points of the sine curves,
one flow path of the plurality of first flow paths is connected, via the plurality of notches and the in-element notch formed on two flow path walls 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 the first flow path,
one of the two flow path walls separates the one flow path from one of the two flow paths,
another one of the two flow path walls separates the one flow path from another one of the two flow paths, and
the plurality of notches and the in-element notch are formed, such that two flow path wall elements are included in a plurality of elements obtained by dividing the plurality of flow path walls with the plurality of notches and the in-element notch, such that a straight line segment connecting the two flow path wall elements extends across more than three flow paths of the plurality of first flow paths without intersecting the plurality of elements, and such that a straight line parallel to an amplitude direction of the sine curves intersects the plurality of notches and the in-element notch without intersecting the plurality of elements.
 
4. 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 second flow paths through which a second fluid different from a first fluid flowing through the plurality of first flow paths flows,
the plurality of flow path walls have a plurality of wall surfaces,
the plurality of wall surfaces conform to sine curves different in position from each other, respectively,
each of the plurality of flow path walls is divided into a plurality of flow path wall elements by forming a plurality of notches at each period of the sine curves, the plurality of notches overlapping inflection points of the sine curves, and
each of the plurality of flow path wall elements overlaps with either maximum points or minimum points of the sine curves, and is further divided by forming an in-element notch overlapping another inflection point of the sine curves which is different from the inflection points where the notches overlap, each of the plurality of flow path wall element including an intermediate flow path wall element disposed in the in-element notch.