Mitsubishi Electric Corporation

Takahide Tadokoro

Takashi Ikeda

Katsuyuki Yamamoto

Shingo Hamada

Yasuaki Kato

Atsushi Kono

Takuya Teramoto

Seiji Nakashima

Takafumi Abe

Yuki Ugajin

Yutaka Aoyama

Mitsuhiro Shirota

Hiroya Ito

Shuhei Mizutani

Masahiko Takagi

Makoto Kurihara

Naomichi Tamura

Seiji Hirakawa

Koji Yamaguchi

Takashi Kobayashi

Hiroshi Yoshikawa

Shinya Higashiiue

Yohei Kato

Hiroaki Makino

Tetsuya Yamashita

Kazuki Okada

Mizuo Sakai

Naohiko Honma

Keisuke Hokazono

Tetsuo Yamashita

Naho Adachi

Kazuma Nomoto

Masanobu Baba

Hiroyuki Takada

Noka Sakabe

Koichi Umetsu

Takuya Kodama

A propeller fan according to the present disclosure includes a rotation shaft and a blade rotating around the rotation shaft. At the same position in an axial direction of the rotation shaft, a first locus connecting a leading edge of the blade and an outer peripheral end of the blade is tilted with respect to a second locus connecting a center of the rotation shaft and the leading edge so that the outer peripheral end side is inclined toward a trailing side. Alternatively, a third locus connecting a root of the blade and the outer peripheral end of the blade is tilted with respect to a fourth locus connecting a center of the rotation shaft and the root so that the outer peripheral end side is inclined toward the trailing side.

Propeller fan, blower, and air conditioner

An axial flow fan includes a hub driven to rotate and configured to serve as a rotation axis of the axial flow fan and a blade connected to the hub. The blade has a leading edge and a trailing edge. The trailing edge has an indentation indenting toward the leading edge. The indentation narrows from the trailing edge to the leading edge, and has an apex being a point closest to the leading edge from among the points constituting the indentation. The blade has, at the indentation, a maximum thickness portion at which a thickness of the blade is maximum, and which is positioned radially inside of the apex.

Axial flow fan, air-sending device, and refrigeration cycle apparatus

An axial fan includes a hub having a rotation shaft and configured to be driven to rotate and blades provided to the hub. The blades each have a front edge portion and a rear edge portion. A first blade section is a section of a portion between the front edge portion and the rear edge portion of each of the blades along a direction in which the blades rotate, and the first blade section is an area of each of the blades that is further inward than an outer periphery edge portion that is a most radially outer periphery in each of the blades. In the first blade section, the blades each have a projection portion and a first recess portion. The projection portion projects from a portion of a pressure surface of each of the blades. The first recess portion recedes from a portion of the pressure surface that is between the projection portion and the rear edge portion. The projection portion has a projection top that is a top of the projection portion and is closer to the rear edge portion than is a center between the front edge portion and the rear edge portion in the first blade section.

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

An axial-flow fan includes a hub that is to be rotated and defines a rotation axis, and a vane provided on a circumference of the hub. The vane includes a leading edge, a trailing edge, an outer circumferential edge, and an inner circumferential edge. The vane is shaped such that a first line chart in a first diagram includes a downward convex portion that is convex further downward than a first virtual line chart, the first virtual line chart being a linear line connecting a point representing a size of an outlet angle formed at a point of the trailing edge that is at the inner circumferential edge and a point representing a size of the outlet angle formed at a point of the trailing edge that is at the outer circumferential edge.

Axial-flow fan, and outdoor unit for air-conditioning apparatus

An outdoor unit of an air-conditioning apparatus includes a bell mouth that has a first tapered portion and a straight pipe portion. The first tapered portion has a linking portion that is continuous with a first bent portion and a second bent portion in a region located between the first and second bent portions and that has an inner surface extending linearly. The angle of inclination of the inner surface of the linking portion relative to a direction along an axis of the straight pipe portion is 33 degrees or more. The ratio of the sum of a first length of the first tapered portion and a second length of the straight pipe portion to the total length of the bell mouth is less than 0.76.

Outdoor unit of air conditioning apparatus

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

An air-sending device includes a fan and a grille provided downstream of the fan in a direction of airflow generated by the fan. The grille includes a first grille that includes a plurality of first bars spaced from each other, and a second grille that includes a plurality of second bars spaced from each other. The plurality of second bars are more densely arranged than the plurality of first bars. The second grille is provided upstream of the first grille in the direction of the airflow generated by the fan, and spaced from the first grille to face the first grille.

Air-sending device and air-conditioning apparatus

An air-sending device includes a propeller fan, a bell mouth surrounding an outer periphery of the propeller fan, a fan grille disposed downstream of the bell mouth and including a plurality of first crosspieces. An edge of the air outlet of the bell mouth includes a varying portion whose distance from a rotation axis of the propeller fan varies. In a cross-section of any of the plurality of first crosspieces that is perpendicular to a longitudinal direction of the any of the plurality of first crosspieces, a virtual line segment connecting an upstream side end portion and a downstream side end portion is defined as a first virtual line segment. At the portions of the plurality of first crosspieces disposed on the inner circumference side of the varying portion, the angle between a virtual line segment parallel to the rotation axis and the first virtual line segment is changed.

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.

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

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.

An axial-flow fan includes an impeller including plural blades fixed to an outer peripheral portion of the hub and each surrounded by an inner peripheral edge, an outer peripheral edge, a leading edge, and a trailing edge. The leading edge is forward-curved in a rotational direction with an angle increasing to outer periphery of the impeller and runs toward an outer periphery up to point A, the trailing edge is forward-curved in the rotational direction and runs toward the outer periphery up to point D, recedes in the rotational direction of the impeller as the trailing edge runs toward the outer periphery up to point A' located closer to the outer periphery than point D is to the outer periphery, advances in the rotational direction of the impeller in a region between point A&#x2032; and point B&#x2032;, and reflexed at point D and point A&#x2032;.

Axial-flow fan and outdoor unit

In a propeller fan, an air-sending device and an air-conditioning apparatus, between a leading edge and trailing edge of each of blades, a starting point at which the first one of first maximum points is located is closer to the leading edge than a starting point at which the first one of second maximum points are located, distances Lbetween minimum points and the first maximum points vary such that the distance Lincreases from the starting point at which the first one of the first maximum points is located, toward the trailing edge, and distances Lbetween a connection point and the second maximum points vary in accordance with the position of each of the second maximum points such that the distance Lincreases from the starting point at which the first one of the second maximum points is located, toward the trailing edge.

Propeller fan, air-sending device, and air-conditioning apparatus

An outdoor unitof an air-conditioning apparatus includes a housing having a box shape and including air inlets formed on side surfaces and an air outlet formed on an upper surface, a fan provided to an upper side in the housing and configured to discharge, through the air outlet, outside air sucked through the air inlets, and a heat exchanger provided in the housing along each of the air inlets. The heat exchanger includes an upper heat exchanger disposed at an upper part of the housing and a lower heat exchanger disposed at a lower part of the housing. In plan view, the housing has different widths in short-side and long-side directions, and the width in the short-side direction at the upper part of the housing is longer than the width in the short-side direction at the lower part of the housing.

Outdoor unit of air-conditioning apparatus

Provided is an air-sending device in which, in blades, an upstream end of a blade outer periphery is more on an upstream side than an upstream end of a blade inner periphery as seen along a rotation axis, and a downstream end of a blade outer periphery is more on a downstream side than a downstream end of the blade inner periphery, and in which, in the blades, when an angle formed by a line segment, which connects a point internally dividing a line segment connecting the downstream end and the upstream end of an outer periphery of the blades along the rotation axis and a point internally dividing a line segment connecting the downstream end and the upstream end of an inner periphery of the blades along the rotation axis at the same ratio to each other, and a reference line is defined as &#x3b8;, and a direction inclined toward the downstream side is defined as positive, the angle &#x3b8; is changed from negative to positive at a duct portion.

Growing community of inventors

Tokyo, Japan

Takahide Tadokoro