Hitachi, Ltd.

Takeo Tanaka

Masakatsu Hayashi

Masaaki Itoh

Toshio Hatada

Takao Senshu

Tatsuo Natori

Akira Tomita

Tatsushi Aizawa

Shigeo Ohashi

Hirokiyo Terada

Susumu Iwai

Minetoshi Izushi

Yoshihiko Mochizuki

Naoto Katsumata

Makoto Nagai

Minoru Sato

Mituo Kudo

Shigeru Kojima

Mituo Kodoh

Hiromi Tsuji

A flat shaped header having a heat receiving side is attached to a semiconductor element mounted on a circuit board. The header having the heat receiving side is connected to another header having a heat receiving side attached to a plurality of heat radiating fins so as to form a heat exchanging radiator which heat radiating fins are installed at a peripheral portion of a body of electronic equipment. The heat generated by the semiconductor element is transmitted by liquid moving between the headers via flexible tubes and then to the heat radiating fins, which heat is discharged outside of the body of equipment. Since the flat shaped header and the flexible tubes are employed, a high heat generating semiconductor element and the heat radiating fins are thermally connected with ease without being influenced by the configurational condition in the equipment even when many semiconductor elements are mounted inside a small space.

Electronic equipment and lap-top type electronic equipment

A fin-tube type heat exchanger has parallel heat transfer tubes and a stack of a plurality of plate fins mounted on the tubes. Heat exchange is conducted between a first fluid flowing through the tubes and a second fluid flowing through the stack across each of the fins. Each fin has flat tube-mounting portions spaced in the longitudinal direction of the fin and formed with tube-mounting holes and a louver section disposed between each adjacent pair of tube-mounting portions. The louver section has elongated slats extending longitudinally of the fin and having side edges each spaced from an adjacent side edge of an adjacent slat. The slats are classified into two groups in respect of the cross-sectional shape. The slats of one group have generally flat cross-sections to reduce the resistance of the fin to the flow of the second fluid through the stack and are disposed in planes offset from the plane of the tube-mounting portions. The slats of the other group have V-shaped or inverted V-shaped cross-sections to increase stiffness of the fin in the longitudinal direction thereof.

Fin-tube type heat exchanger

A fin assembly for heat exchangers used in air conditioners or the like. The fin assembly is formed from a thin plate material which is bent and wound to have a plurality of alternating turns each of which constitutes a fin. The fin is provided with a multiplicity of louvers cut-out and raised from the major plane thereof. The fins are inclined at an angle .theta. which is 30.degree. or smaller to the direction of flow of the gas entering the fin assembly, while the louvers are inclined at an angle .gamma. which is 20.degree. or smaller to the direction of flow of the gas entering the fin assembly in the direction opposite to the direction of inclination of the fin plates.

Fin assembly for heat exchangers

A heat exchanger fin according to the invention has a multiplicity of fins arranged substantially in parallel with the direction of air flow and at least one heat transfer tube to which said fins are connected in a heat conducting relation. A multiplicity of louvers inclined by a small angle to the direction of air flow are formed in said fins. According to this construction, it is possible that the air as a whole can flow substantially straight across the heat exchanger and can strongly collide with all louvers, thereby to ensure a reduced flow resistance encountered by the air flow, as well as improved heat transfer performance of the heat exchanger.

Heat exchanger fin

A method of producing a heat exchanger in which a fin block of porous metal and fin plates connected to the fin block are unitarily secured to a serpentine heat-transmitting pipe. A plurality of fin molds produced with the use of plastic patterns formed therein with continuous, three-dimensional cavities are assembled with the heat-transmitting pipe shaped beforehand into a serpentine form in such a manner that the fin molds enclose the heat-transmitting pipe with suitable spacing intervals defined between the fin molds themselves and between the fin molds and the heat-transmitting pipe. Molten metal of high thermal conductivity is cast into continuous cavities in the fin molds and into the spacing intervals, and the material of the fin molds is removed after the molten metal has solidified.

Method for the production of heat exchangers

A three-dimensional network porous metallic structure is formed by filling the internal cavity of a mold, which has been prepared by making use of a three-dimensional network resin pattern, through driving the molten metal into the cavity by a pressure or through sucking the molten metal into the cavity by reducing the pressure in the cavity. The porous metallic structure thus obtained is characterized by a large specific surface area, as well as a reduced pressure drop of fluid passing through this structure, and, therefore, is fit for various uses such as the material of fins of heat exchangers, various filters and so forth.

Method of forming three-dimensional network porous metallic structure

Growing community of inventors

Ibaraki, Japan

Takeo Tanaka