US 11,719,495 B2
Plate heat exchanger, heat pump device including plate heat exchanger, and heat pump type of cooling, heating, and hot water supply system including heat pump device
Faming Sun, Tokyo (JP); Susumu Yoshimura, Tokyo (JP); Yoshitaka Eijima, Tokyo (JP); Sho Shiraishi, Tokyo (JP); Ryosuke Abe, Tokyo (JP); Masahiro Yokoi, Tokyo (JP); and Kazutaka Suzuki, Tokyo (JP)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP)
Appl. No. 16/979,047
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Feb. 28, 2019, PCT No. PCT/JP2019/007857
§ 371(c)(1), (2) Date Sep. 8, 2020,
PCT Pub. No. WO2019/176565, PCT Pub. Date Sep. 19, 2019.
Claims priority of application No. 2018-047954 (JP), filed on Mar. 15, 2018.
Prior Publication US 2020/0408475 A1, Dec. 31, 2020
Int. Cl. F28F 3/08 (2006.01); F24H 4/02 (2022.01); F25B 13/00 (2006.01); F25B 39/00 (2006.01); F25B 39/04 (2006.01)
CPC F28F 3/086 (2013.01) [F24H 4/02 (2013.01); F25B 13/00 (2013.01); F25B 39/00 (2013.01); F25B 39/04 (2013.01); F28F 2265/16 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A plate heat exchanger comprising:
a plurality of heat transfer plates each of which has openings at four corners thereof, the plurality of heat transfer plates having outer wall portions at edges thereof and being stacked together,
wherein the plurality of heat transfer plates are partially brazed together such that a first flow passage through which first fluid flows and a second flow passage through which second fluid flows are alternately provided, with an associated one of the plurality of heat transfer plates interposed between the first flow passage and the second flow passage, the openings at the corners of the plurality of heat transfer plates being provided such that the openings at each of the corners communicate with each other, thereby forming a first header and a second header, the first header being configured to allow the first fluid to flow into and flow out of the first flow passage, the second header being configured to allow the second fluid to flow into and flow out of the second flow passage,
wherein at least one of two of the plurality of heat transfer plates between which the first flow passage or the second flow passage is located is formed by stacking two metal plates together, and
wherein space between the two metal plates includes
a fine flow passage that is located within a heat exchange region in which the first fluid and the second fluid exchange heat, and
a peripheral leakage passage provided outward of the fine flow passage to communicate with the outside of the space and having a hydraulic diameter greater than a hydraulic diameter of the fine flow passage.