Mitsubishi Jukogyo Kabushiki Kaisha

Kazuo Ishii

Masateru Hayashi

Minoru Ohtsuka

Shoji Fukami

Hiroshi Iokawa

Hidenao Kawai

Yoshifumi Moriguchi

Kenji Matsuda

Akihiro Ito

Shigeo Sakai

Yasuhiko Hirao

The stacked heat exchanger in accordance with the present invention comprises flat tubes and corrugated fins which are alternately put together, the flat tube having a tank portion and a core portion, the tank portion on one side at the outermost portion having an inlet header, the tank portion on the other side at the outermost portion having an outlet header, and the core portion having a side plate as an external plate at both ends, wherein the upper end of the side plate abuts against the lower end of the inlet header and the lower end of the outlet header. Therefore, when a pressure is applied, a force in the spreading direction applied to the inlet/outlet tank portion is received by the abutting of side plate against said inlet and outlet headers. Thus, the deformation of the whole stacked heat exchanger can be prevented.

Stacked heat exchanger

The stacked heat exchanger of the present invention has a structure wherein grooves are brazed together to seal the external surface of the coolant passage, further grooves are brazed together to form a partition between the straight incoming and outgoing flow passages, and least one groove in the straight incoming and outgoing flow passage section which groove runs in parallel with the grooves earlier mentioned is formed on the formed plates. With this structure, drain water flows down promptly through these grooves and the splashing of the drain water into the downstream area of the heat exchanger can be prevented.

The present invention discloses a stacked heat exchanger in which separate flow paths 54 and 55 which are formed by corrugated inner fins 52 and 53 are disposed in chambers 48 and 49 of a flat tube 41, and also separate U-shaped flow paths 56 are formed at the U-turn portion 50 to make the flow of refrigerant smooth, increase the area of flow paths, and eliminate the stagnation of refrigerant at the U-turn portion 50. The separation of refrigerant into two phases of gas and liquid due to centrifugal forces at the U-turn portion 50 is limited to the inside of each divided U-shaped flow path 56, thereby the distribution of the gas and liquid phases can be decreased. Also disclosed is a method of manufacturing a stacked heat exchanger, in which the reliability of flat tube 41 is improved, and the leakage of refrigerant is prevented.

Stacked heat exchanger and method of manufacturing the same

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Nishibiwajima, Japan

Kazuo Ishii