Heat exchange – Flow passages for two confined fluids – Interdigitated plural first and plural second fluid passages
Patent
1999-04-05
2000-08-15
Flanigan, Allen
Heat exchange
Flow passages for two confined fluids
Interdigitated plural first and plural second fluid passages
165DIG355, 165DIG399, F28D 900
Patent
active
061021113
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a heat exchanger including high-temperature fluid passages and low-temperature fluid passages defined alternately by folding a plurality of first heat-transfer plates and a plurality of second heat-transfer plates in a zigzag fashion.
BACKGROUND ART
Heat exchangers described in Japanese Utility Model Application Laid-open No.4-82857 and Japanese Patent Application Laid-open No.58-205091 are known which include a plurality of heat-transfer plates disposed in parallel at a predetermined distance, and plates are brazed to end faces of the heat-transfer plates to define fluid passages.
When partition walls for partitioning combustion gas passage inlets and outlets from air passage outlets and inlets are formed by the plates brazed to the end surfaces of the heat-transfer plates, a load is applied to the plates due to a pressure differential between a combustion gas and air. For this reason, there is a possibility that a stress may be concentrated on brazed portions of the plates and the end surfaces of the heat-transfer plates, resulting in a reduced durability.
DISCLOSURE OF THE INVENTION
The present invention has been accomplished with the above circumstances in view, and it is an object of the present invention to avoid that the stress is concentrated on the bonded portions of end surfaces of the heat-transfer plates, thereby enhancing the durability.
To achieve the above object, according to a first aspect and feature of the present invention, there is provided a heat exchanger which is formed from a folding plate blank comprising a plurality of first heat-transfer plates and a plurality of second heat-transfer plates which are alternately connected together through first and second folding lines, the folding plate blank being folded in a zigzag fashion along the first and second folding lines, so that a gap between adjacent ones of the first folding lines is closed by bonding the first folding lines and a first end plate to each other, while a gap between adjacent ones of the second folding lines is closed by bonding the second folding lines and a second end plate, whereby high-temperature and low-temperature fluid passages are defined alternately between adjacent ones of the first and second heat-transfer plates, and in which opposite ends of each of the first and second heat-transfer plates in a flowing direction are cut into angle shapes each having two end edges, and a high-temperature fluid passage inlet is defined by closing one of the two end edges and opening the other end edge at one end of the high-temperature fluid passage in the flowing direction, while a high-temperature fluid passage outlet is defined by closing one of the two end edges and opening the other end edge at the other end of the high-temperature fluid passage in the flowing direction and further, a low-temperature fluid passage inlet is defined by opening one of the two end edges and closing the other end edge at the other end of the low-temperature fluid passage in the flowing direction, while a low-temperature fluid passage outlet is defined by opening one of the two end edges and closing the other end edge at one end of the low-temperature fluid passage in the flowing direction, and a partition plate is bonded to an apex of the angle shape at one end in the flowing direction to partition the high-temperature fluid passage inlet from the low-temperature fluid passage outlet, while a partition plate is bonded to an apex of the angle shape at the other end in the flowing direction to partition the low-temperature fluid passage inlet from the high-temperature fluid passage outlet, characterized in that bonded portions of the apex of the angle shape at the one end in the flowing direction with the partition plate and/or bonded portions of the apex of the angle shape at the other end in the flowing direction with the partition plate are comprised of a pair of bonding flanges which are brought into surface contact with and integrally bonded to a bonding base plate, the pa
REFERENCES:
patent: 3265129 (1966-08-01), Bawabe
patent: 4582126 (1986-04-01), Corey
patent: 5065816 (1991-11-01), Darragh
Kamio Junichi
Tsunoda Tadashi
Flanigan Allen
Honda Giken Kogyo Kabushiki Kaisha
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