Nippondenso Co., Ltd.

Other

Akio Ueda

Seiichi Kato

Hisashi Nakashima

Kazuo Nishizawa

Masami Tamura

Fumio Moriyama

Takahiro Naruse

Shogo Kurachi

Masakazu Hyodo

Akio Shimizu

Hiroshi Uchida

A recess portion for setting an attachment position is formed in each plate fin at positions adjacent to both longitudinal ends of the plate fins on both upstream and downstream ends in an air flowing direction. Therefore, air passing through the plate fins is disturbed by a standing wall portion of the recess portion around the longitudinal ends of the plate fins. Thus, it can prevent a thermal boundary layer from being expanded in a heat exchanger having the plate fin, and heat-transmission efficiency can be improved in the heat exchanger. As a result, an entire area of the plate fin can be effectively used, thereby improving heat-exchanging capacity of the heat exchanger.

Plate-fin type heat exchanger and method for manufacturing the same

A molding die having, an outer eccentric ring slidably fitted in an axle hole of a boss molding die assembly of a molding die unit, outer eccentric ring being formed with an eccentric hole the center of which is deviated from the center of the outer eccentric ring, an inner eccentric ring slidably fitted in this eccentric hole of the outer eccentric ring, and a holding pin for holding an insert and slidably fitted in the inner eccentric ring at a point which is deviated from the center of the inner eccentric ring. In adjusting the balance, the position of the holding pin is adjusted such that the center of rotation coincides with the center of gravity of the molded articles. In forming the die, the insert held by the holding pin of which position was adjusted is embedded in the molded article.

Method and apparatus for adjusting the center of gravity of the article

A solderless type heat exchanger having an upper and lower tanks, header plates closing the opposing opened ends of respective tanks, a plurality of tubes extending through the head plates to provide a communication between the upper and lower tanks, and a plurality of plate fins attached to the outside of the tubes, the tubes being joined to the header plates and plate fins solely by pressure contact therebetween provided through expansion of the tubes. The header plate is provided with a collared portion around each bore for receiving the corresponding tube and an annular groove is formed around the periphery of each collared portion. The annular groove provides a resiliency which ensures the rigid and stable joint between the tubes and the header plate achieved solely by the pressure contact through the expansion of the tube.

Solderless heat exchanger

Growing community of inventors

Nagoya, Japan

Akio Ueda