Mitsubishi Electric Corporation

Asahi Glass Company, Limited

Agc Inc.

Yuki Ugajin

Akira Ishibashi

Daisuke Ito

Shinya Higashiiue

Takashi Ikeda

Shingo Hamada

Shigeyoshi Matsui

Hiroya Ito

Takahide Tadokoro

Hideaki Maeyama

Atsushi Mochizuki

Takashi Matsumoto

Yasuhiro Suzuki

Takuya Teramoto

Shin Nakamura

Takashi Okazaki

Tsuyoshi Maeda

Yoji Onaka

Yohei Kato

Yusuke Adachi

Katsuyuki Yamamoto

Takumi Nishiyama

Takafumi Abe

Ryota Akaiwa

Hiroaki Makino

Hiroshi Omura

Satoshi Ueyama

Mitsuhiro Shirota

Susumu Yoshimura

Norihiro Yoneda

Takuya Furuhashi

Miho Ishikawa

Aya Kawashima

Shinya Higashiiiue

A propeller fan includes a shaft portion disposed on a rotation axis, and a blade disposed on an outer peripheral side of the shaft portion and including a leading edge and a trailing edge. The blade includes a negative pressure surface in which a plurality of recesses are formed, and the plurality of recesses include a first recess and a second recess disposed on the trailing edge side than the first recess in a circumferential direction about the rotation axis as a center. The first recess has a depth larger than a depth of the second recess.

Propeller fan, air-sending device, and refrigeration cycle device

A propeller fan according to an embodiment of the present invention includes a shaft provided a rotation axis of the propeller fan, and a blade provided on an outer peripheral side of the shaft. The blade has a trailing edge on a rear side of the blade in a rotation direction of the propeller fan. The trailing edge includes a first trailing edge located on an innermost side of the trailing edge, and a second trailing edge adjacent to and outward of the first trailing edge. Where an innermost point of the first trailing edge is a first connection point, a connection point between the first trailing edge and the second trailing edge is a second connection point, and a straight line that extends through the rotation axis and the first connection point is a reference line, the second connection point is located forward of the reference line in the rotation direction, or located on the reference line, and the second trailing edge is located rearward of the second connection point in the rotation direction.

Propeller fan, air-sending device, and refrigeration cycle apparatus

A propeller fan includes a cylindrical shaft portion provided on a rotation axis of the propeller fan; a plurality of blades provided on an outer peripheral side of the shaft portion; a connection portion provided adjacent to the shaft portion and connecting two of the plurality of blades that are adjacent to each other in a circumferential direction of the propeller fan; a first rib provided on at least one of a pressure surface of each of the plurality of blades and a surface of part of the connection portion that is located on a downstream side in the flow of air, and a second rib provided on at least one of a negative-pressure surface of each of the plurality of blades and a surface of part of the connection portion that is located on an upstream side in the flow of air.

A heat exchanger includes a plurality of plate-shaped fins disposed at intervals, and a plurality of heat transfer tubes disposed to be inserted into through holes of the fins in a direction perpendicular to the fins. In each of the fins, a starting hole is formed between adjacent through holes, and the starting hole serves as a start point of bending of the fins and has a vertex portion at a bending portion of each fin which is close to an edge thereof. In each of the fins, a cut is made to connect the other edge of the fin and a side of the starting hole which is located opposite to the vertex portion of the starting hole. The above each fin is bent at the vertex portion of the starting hole, by opening the cut from the starting hole.

Heat exchanger, refrigeration cycle apparatus, and method for manufacturing heat exchanger

A heat exchanger includes a plurality of flat tubes provided to extend in a first direction, and a plurality of plate-shaped fins having respective surfaces extending in a second direction. The surface has a windward edge and a leeward edge. The plurality of flat tubes include a first flat tube disposed most windward in the second direction, and a second flat tube spaced apart from the first flat tube and disposed most leeward in the second direction. In the second direction, a distance between the leeward edge and a center of a flat shape of the second flat tube is at least one-third of a width between the windward edge and the leeward edge.

Heat exchanger

Plate-shaped fins of a heat exchanger each include, at circumferential portions thereof defining a notch in which a heat transfer tube having a flattened shape is disposed, fin collars formed by being raised from the circumferential portions. Each of the fin collars includes, in a position that faces a long axis side surface of the heat transfer tube, at least one reflare section bent in a direction opposite to the side surface. At least one of the reflare sections defining fin pitches between the adjoining plate-shaped fins is formed so that a reflare tip portion, which is a tip portion of the reflare section, is drawn apart from a contact side surface of the plate-shaped fin with which the reflare section comes into contact.

Heat exchanger and method for manufacturing plate-shaped fins for heat exchanger

Propeller fan

A heat exchanger includes: a first heat transfer portion including a plurality of first flat tubes arranged at equal intervals and spaced apart from each other by a distance Dp in a gravity direction; and a second heat transfer portion positioned downstream of the first heat transfer portion in a flow direction of a heat exchange medium perpendicular to the gravity direction, the second heat transfer portion including a plurality of second flat tubes arranged at equal intervals and spaced apart from each other by the distance Dp in the gravity direction.

A heat exchanger includes a first heat exchanging portion including first and second flat tubes stacked in parallel with each other and spaced from each other to allow fluid to pass between the first and second flat tubes, and a second heat exchanging portion including third and fourth flat tubes stacked in parallel with each other, spaced from each other to allow fluid to pass between the third and fourth flat tubes, and oriented crosswise to a direction in which the first and second flat tubes are oriented. The second heat exchanging portion is arranged downstream of the first heat exchanging portion with respect to flow of the fluid.

Heat exchanger and refrigeration cycle apparatus including the same

Provided is a heat exchanger, including: a first heat exchange unit, which includes a first flat tube; a second heat exchange unit, which is arranged so as to be opposed to the first heat exchange unit, and includes a second flat tube; and a tank, which connects the first heat exchange unit and the second heat exchange unit to each other. The tank has an upper wall and a lower wall defining an upper end and lower end of a tank space formed in the tank, respectively. One end of the first flat tube and one end of the second flat tube are connected to the tank space. When a height from the lower wall to the upper wall is defined as X, and a height from the lower wall to the one end of the first flat tube is defined as Y, a relation between X and Ysatisfies Y&#x3c;(&#xbd;)X.

Heat exchanger and refrigeration cycle apparatus

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Tokyo, Japan

Yuki Ugajin