Fujitsu General Limited

Sota Shimada

Junya Tanaka

Kazuya Funada

Kenji Komine

Toshiyuki Fuji

Shunji Itakura

Ken Horiguchi

Nobutaka Nakahen

Syunji Noda

Yoko Okuwaki

Toshihisa Tomita

A rotary compressor includes: a closed upright cylindrical compressor housing including an upper portion provided with a discharge section of refrigerant and a body portion provided with an intake section of the refrigerant; a compression section disposed at a lower part in the compressor housing and configured to compress the refrigerant suctioned by the intake section to discharge the refrigerant from the discharge section; and a motor disposed at an upper part in the compressor housing and configured to drive the compression section. The motor has a rotor disposed on an inner side and a stator disposed on an outer side, the refrigerant is HFO1123 refrigerant or a refrigerant mixture containing the HFO1123 refrigerant, and an inner welded portion formed by welding using flux is provided within a projection area of the rotor at the upper portion of the compressor housing.

Rotary compressor and refrigeration cycle device

A heat exchanger includes: a heat transfer pipe in which refrigerant flows; and a spiral groove formed at an inner peripheral surface of the heat transfer pipe. A height of an inner wall of the groove in a radial direction of the heat transfer pipe is equal to or greater than 0.1 [mm], and when a wetted edge length of the heat transfer pipe is S, an inclination angle between a pipe axis direction of the heat transfer pipe and a longitudinal direction of the groove in a section of the heat transfer pipe parallel with the pipe axis direction is &#x3b8;, and a length of the heat transfer pipe is L, the inclination angle &#x3b8; is an acute angle, and a wetted area S&#xd7;L/cos &#x3b8; of the heat transfer pipe satisfies S&#xd7;L/cos &#x3b8;&#x2265;0.5 [m2].

Heat exchanger and refrigeration cycle device

Growing community of inventors

Kanagawa, Japan

Sota Shimada