Mitsubishi Denki Kabushiki Kaisha

Makoto Yamada

Kiyoshi Sakuma

Hiroyuki Umemura

Masao Fujii

Yu Seshimo

Yoshiaki Tanimura

Ikuo Tsukamoto

Takayuki Yoshida

Katsuyuki Aoki

Ken Morinushi

Tomohumi Tezuka

Yuji Nakanishi

Masao Hujii

A fin-and-tube heat exchanger comprises a fin plate, a heat exchanger tube having portions extending through the fin plate, a plurality of fin collars formed in the plate, wherein louvers are provided so as to surround the tube portions except areas nearest to the collars, the louvers are in parallel with one another and project from alternately both surfaces of the plate, the louver which is located at the trailing edge side and at a position near to a central line of the tube bank is longitudinally extended so as to be along the collars and has opposite rising ends extending from the plate slanted toward the corresponding tube portions at an angle of 35 deg or below to the flow direction of the fluid, and the louver which is located at a position nearer to the trailing edge is also longitudinally extended and has opposite rising ends extending from the plate slanted toward the corresponding tube portions at an angle of 35 deg or above to the flow direction of the fluid so that the angle between the rising ends slanted at an angle of 35 deg or above and the rising ends slanted at an angle of 35 or below is 35 deg or below.

Heat exchanger

Heat radiation plate

A heat exchanger comprises a plurality of regularly corrugated fins placed one over another in layers at regular pitches in a back-to-back arrangement so as to form alternate wide and narrow fluid passage between the adjacent corrugated fins, and each having a plurality of small through holes, a plurality of collars formed in a staggered arrangement, and an annular area not having any small through hole and formed so as to surround the root of each collar; and pipes for passing a secondary fluid therethrough, each inserted through the collars of the layers of the corrugated fins. The height of the collar from the lower surface of the annular area corresponds to the pitch between the adjacent corrugated fins, and thereby the corrugated fins can be assembled at regular pitches simply by placing one over another. The pipes are expanded after being inserted through the collars so that the pipes are firmly and closely joined to the collars for satisfactory heat transmission between the fins and the pipes.

Heat exchanger for an air-conditioning apparatus

A heat exchanger comprises a plurality of perforated and regularly corrugated heat transfer plates arranged in a ridge-to-ridge and furrow-to-furrow arrangement, so as to form primary fluid passages each consisting of alternate expanded sections and narrowed sections arranged along the direction of flow of a primary fluid, and a plurality of pipes for passing a secondary fluid therethrough, the pipes penetrating through and across the heat transfer plates. Oblique guide grooves are formed in the surfaces of each heat transfer plates to facilitate the downward flow of the condensate condensed over the surfaces of the heat transfer plates, the grooves being inclined closer to the vertical than to the horizontal to facilitate downward flow of any vapor condensed on the plates from the primary fluid whereby the heat transfer plates dry quickly for efficient heat exchange between the primary and secondary fluids.

Heat exchanger with corrugated heat transfer plates

This invention relates to a brush holder for a rotary electric apparatus comprising: a holder body having a brush frame for slidably holding a brush, a brush retainer pivotally secured to a holder arm attached to the holder body through a pin, a spring provided between the holder body and the brush retainer, a stopper mounted on the holder body for stopping the movement of the brush retainer at a predetermined position, and a contacting piece mounted on the stopper being electrically insulated from said holder body and positioned so that it comes into electromechanical contact with the brush retainer when the brush reaches the wearing limit.

Brush holder for rotary electric apparatus

Growing community of inventors

Shizuoka, Japan

Makoto Yamada