Hitachi-johnson Controls Air Conditioning, Inc.

Hitachi Construction Machinery Co., Ltd.

Daiwa Sato

Kazuhiro Tsuchihashi

Hitoshi Nishiguchi

Shigeyuki Sasaki

Ryoichi Takafuji

Kazuya Kusano

Kunihiko Ikeda

Kenichi Hano

A construction machine includes a centrifugal fan, and a bell mouth arranged on the suction side of the centrifugal fan. The centrifugal fan has a rotatable hub, an annular shroud arranged so as to face the hub and having a suction port, and multiple blades provided between the hub and the shroud. An outlet of the bell mouth is arranged on the radially inner side of the suction port of the shroud. Each blade is formed such that: a leading edge has a convex shape protruding toward a suction surface relative to a line segment linking a connection of the leading edge with the hub and a connection of the leading edge with the shroud; and a vertex of the convex shape of the leading edge is positioned on a radially inner side of a wall surface of the outlet of the bell mouth when the suction side of the centrifugal fan is seen in an axis direction.

Construction machine

A heat exchanger is provided which has: multiple flat heat transfer pipes configured such that refrigerant for heat exchange with air flowing inside; and a fin having a heat exchange surface between adjacent ones of the heat transfer pipes, wherein the multiple heat transfer pipes are arranged such that flat portions of the heat transfer pipes face each other, the fin has one end and other end in an air flow direction, and a first rib formed vertically above the flat portion, and the first rib has an extension portion extending along the flat portion, and an enlarged portion configured such that a distance to the flat portion gradually increases from the extension portion in a direction of one end side.

Heat exchanger and air conditioner

The present disclosure provides an indoor unit of an air conditioner includes a housing, a centrifugal fan arranged inside the housing, and a heat exchanger arranged so as to surround the centrifugal fan, in which the heat exchanger includes an area cut in a direction of rotation of the centrifugal fan. A current plate provided at a final portion of the heat exchanger in the direction of the rotation of the centrifugal fan includes a first face which is extended in a height direction of the heat exchanger and blocks an air flow produced between the centrifugal fan and the heat exchanger and a second face protruded from the first face in a direction opposite the air flow. The indoor unit has an advantageous effect to suppress an inflow of air to a space where the heat exchanger is cut in the indoor unit to reduce the power consumption.

Air conditioner and indoor unit of the same

Growing community of inventors

Tokyo, Japan

Daiwa Sato