Hitachi, Ltd.

Yukio Kitayama

Izumi Ochiai

Masahiro Miyagi

Yoshio Nozawa

Katsuharu Uehara

Masaaki Itoh

Katsuo Arai

Hiroshi Kogure

Takahiko Deguchi

Tadaaki Ayabe

Kenji Iino

Keikichi Morita

Tamotsu Nakayama

An apparatus for producing various heat exchangers is disclosed in which a plurality of heat exchangers disposed side by side are formed at once. A series of manufacturing stations for working heat exchanger components such as fins and tubes and for opening the tubes are arranged in an endless manner to thereby automatically carry out the production steps with a high productivity while meeting various requirements of the specifications of the heat exchangers with a high flexibility.

Apparatus for assembling fins and tubes for heat exchangers

Disclosed is a tube-enlarging press in which clamping units are provided for preventing the fins and tubes used in a heat exchanger, from being buckled. The clamping units are provided with a through-hole for permitting the passage therethrough of mandrels falling outside of the area of the fin when the mandrels are lowered during the tube enlarging process. Therefore, the arrangements and preparations for replacement of the mandrels can be omitted.

Tube-enlarging press for use in heat exchanger fabrication

A fin-and-tube type heat exchanger is disclosed in which the height of each raised, slotted louver from a fin base portion continuously changes in a direction crossing at right angles both the direction of the air flow and the direction of lamination of fins, and two or three kinds of such louver pairs, each consisting of louvers symmetric with each other with respect to the fin base portion, are arranged regularly.

Fin-and-tube type heat exchanger

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Oyama, Japan

Yukio Kitayama