Abstract: An impeller includes a boss provided on a rotation axis and a blade provided on an outer circumferential side of the boss. The blade has a radially middle portion that is located midway between an outer circumferential edge and an inner circumferential edge in a radial direction of the blade from the rotation axis. A span-direction section of part of the blade that adjoins the leading edge is shaped such that part of a suction side of the blade that is located in an area between the radially middle portion and the outer circumferential edge is concave, and a span-direction section of part of the blade that adjoins the trailing edge is shaped such that part of the suction side of the blade that is located in the area between the radially middle portion and the outer circumferential edge is convex.

Abstract: An indoor unit of an air-conditioning apparatus includes a fan, a heat exchanger, and a drain receiver. The interior of the housing is partitioned into a first space and a second space in an axial direction of the rotating shaft of the fan. In the first space, a first opening is provided to allow air to flow out toward a region located outward of the fan in the first space in a radial direction of the fan. In the second space, no opening is provided and a region located outward of the fan in the second space is closed in the radial direction of the fan. In at least part of a space between the fan in the first space and the heat exchanger, a first water receiving device is provided at a higher position than the drain receiver.

Abstract: A fan includes an impeller including a boss and a plurality of blades; an air guide portion through which an airflow moves from one end to the other end of the air guide portion; and a bell mouth defining a first suction passage inside the bell mouth and defining, together with an inner surface of the air guide portion, a second suction passage outside the bell mouth. Between an upstream end point located in an inlet of the first suction passage and a downstream end point located in an outlet of the first suction passage of the bell mouth, the bell mouth includes a minimum possible radius point to which a distance, in a radial direction, from a rotation axis of the boss is smaller than a distance, in the radial direction, from the rotation axis to the downstream end point.

Abstract: In an air-conditioning apparatus including a heat exchanger to switch between serving as an evaporator and serving as a condenser, the heat exchanger includes a first heat exchanger, a second heat exchanger, and a connection pipe. The first heat exchanger includes a first header divided into a plurality of chambers and connected with one end of each of the first heat transfer tubes, and a second header extending in a horizontal direction and connected with the other end of each of the first heat transfer tubes. The second heat exchanger includes a plurality of second heat transfer tubes, a third header extending in the horizontal direction and connected with one end of each of the second heat transfer tubes, and a fourth header extending in the horizontal direction and connected with the other end of each of the second heat transfer tubes.

Abstract: A fan includes an impeller including a boss and a plurality of blades; an air guide portion through which an airflow moves from one end to the other end of the air guide portion; and a bell mouth defining a first suction passage inside the bell mouth and defining, together with an inner surface of the air guide portion, a second suction passage outside the bell mouth. Between an upstream end point located in an inlet of the first suction passage and a downstream end point located in an outlet of the first suction passage of the bell mouth, the bell mouth includes a minimum possible radius point to which a distance, in a radial direction, from a rotation axis of the boss is smaller than a distance, in the radial direction, from the rotation axis to the downstream end point.

Abstract: An air-sending device includes a propeller fan to rotate about a rotational axis, and a ducted bell mouth surrounding an outboard area of the propeller fan. The propeller fan includes a plurality of blades. Each of the blades includes, in its outboard portion, a reflexed part bent upstream of an airflow that is generated in the direction of the rotational axis by rotation of the propeller fan. In the propeller fan, within an area that is closer to the trailing edge than is the near mid-chord area, the propeller fan is inclined downstream of the airflow from the inboard edge to the reflexed part. In at least a portion of an area where the cylindrical part of the bell mouth and the outboard edge of each blade face each, the reflexed part has a reflex angle of greater than or equal to 90 degrees.

Abstract: In a turbofan, a first curve, formed by projecting a leading edge onto a plane perpendicular to a rotating shaft, has a first inflection point and has a portion that is convex at a point closer to the first inflection point than the first point is in a counter-rotational direction and a portion that is convex at a point closer to the second point than the first inflection point is in the rotational direction, the first point is located forward of the second point in the rotational direction, a second curve, formed by projecting the trailing edge onto a plane perpendicular to the rotating shaft, follows an arc centered on the rotating shaft in a top view, a third curve, formed by projecting the trailing edge onto a cylindrical plane coaxial with the rotating shaft, is formed so as to be convex in the rotational direction, and a junction point of the third curve and the shroud is located behind the junction point of the third curve and the main plate in the rotational direction.

Abstract: A centrifugal fan includes a main plate, a blade connected to the main plate, and a shroud having an annular shape and connected to a shroud-side end of the blade that is an end opposite a main-plate-side end of the blade connected to the main plate. The centrifugal fan rotates about a rotation axis to suction a fluid through an opening of the shroud and discharge the fluid through the blade in a radial direction. A leading edge of the blade includes a recess located next to a point at which a shroud inner surface of the shroud that faces the main plate is connected to the leading edge and curving inwardly from the point toward a trailing edge and a projection located closer to the main plate than is the recess and projecting in the rotation direction.

Abstract: An air-sending device includes a propeller fan to rotate about a rotational axis, and a ducted bell mouth surrounding an outboard area of the propeller fan. The propeller fan includes a plurality of blades. Each of the blades includes, in its outboard portion, a reflexed part bent upstream of an airflow that is generated in the direction of the rotational axis by rotation of the propeller fan. In the propeller fan, within an area that is closer to the trailing edge than is the near mid-chord area, the propeller fan is inclined downstream of the airflow from the inboard edge to the reflexed part. In at least a portion of an area where the cylindrical part of the bell mouth and the outboard edge of each blade face each, the reflexed part has a reflex angle of greater than or equal to 90 degrees.

Abstract: Provided is a method for producing a wavelength conversion sintered body that emits light under irradiation of excitation light. The method for producing a wavelength conversion sintered body includes: preparing a molded body obtained by molding a mixture containing an ?-SiAlON fluorescent material and aluminum oxide particles and having a content of Ga of 15 ppm by mass or less; and primary calcining the molded body at a temperature in a range of 1,370° C. or more and 1,600° C. or less to obtain a first sintered body.

Abstract: A method for producing a wavelength converting member that emits light under irradiation of excitation light, and a wavelength converting member. The method for producing a wavelength converting member, including: providing a green body prepared by a process comprising molding a mixed powder containing a Ca-?-SiAlON fluorescent material and alumina, and depending on necessity an YAG fluorescent material; and primarily sintering the green body at a temperature in a range of 1,000° C. or more and 1,600° C. or less to obtain a first sintered body.

Abstract: An indoor unit of an air-conditioning apparatus includes a fan, a heat exchanger, and a drain receiver. The interior of the housing is partitioned into a first space and a second space in an axial direction of the rotating shaft of the fan. In the first space, a first opening is provided to allow air to flow out toward a region located outward of the fan in the first space in a radial direction of the fan. In the second space, no opening is provided and a region located outward of the fan in the second space is closed in the radial direction of the fan. In at least part of a space between the fan in the first space and the heat exchanger, a first water receiving device is provided at a higher position than the drain receiver.

Abstract: A centrifugal fan and an air-conditioning apparatus are to be provided in which flow separation in a shroud-side region on a suction surface of a blade of the centrifugal fan is reduced to improve efficiency. A centrifugal fan includes a main plate, a blade connected to the main plate, and a shroud having an annular shape and connected to a shroud-side end of the blade that is an end opposite a main-plate-side end of the blade connected to the main plate. The centrifugal fan rotates about a rotation axis to suction a fluid through an opening of the shroud and discharge the fluid through the blade in a radial direction. The blade has a leading edge that is an edge of the blade located forward in a rotation direction and a trailing edge that is an edge opposite the leading edge and is located farther from the rotation axis than is the leading edge.

Abstract: An impeller includes a boss provided on a rotation axis and a blade provided on an outer circumferential side of the boss. The blade has a radially middle portion that is located midway between an outer circumferential edge and an inner circumferential edge in a radial direction of the blade from the rotation axis. A span-direction section of part of the blade that adjoins the leading edge is shaped such that part of a suction side of the blade that is located in an area between the radially middle portion and the outer circumferential edge is concave, and a span-direction section of part of the blade that adjoins the trailing edge is shaped such that part of the suction side of the blade that is located in the area between the radially middle portion and the outer circumferential edge is convex.

Abstract: Provided are a method for producing a ceramic composite material that has a high light emission intensity, a ceramic composite material, and a light emitting device. The method for producing a ceramic composite material, includes: preparing a green body containing a nitride fluorescent material having a composition represented by the following chemical formula (I) and aluminum oxide particles mixed with each other; and performing primary sintering the green body at a temperature in a range of 1,250° C. or more and 1,600° C. or less to provide a first sintered body: MwLn1xAyNz??(I) wherein in the chemical formula (I), M represents at least one element selected from the group consisting of Ce and Pr; Ln1 represents at least one element selected from the group consisting of Sc, Y, La, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu; A represents at least one element selected from the group consisting of Si and B; and w, x, y, and z each satisfy 0<w?1.0, 2.5?x?3.5, 5.5?y?6.5, and 10?z?12.

Abstract: A fan includes an impeller including a boss serving as a center of rotation and a plurality of blades provided on an outer circumferential surface of the boss, and a structure member installed on an upstream side of the impeller in an airflow direction. The plurality of blades each have a plurality of recesses disposed only on a side of a suction surface of a leading edge. The plurality of recesses each have a rectangular shape having two longitudinal sides. Consequently, it is possible to reduce fluctuations of lift on the plurality of blades and thereby reduce discrete frequency noise.

Abstract: Provided is a method for producing a wavelength conversion sintered body that emits light under irradiation of excitation light. The method for producing a wavelength conversion sintered body includes: preparing a molded body obtained by molding a mixture containing an ?-SiAlON fluorescent material and aluminum oxide particles and having a content of Ga of 15 ppm by mass or less; and primary calcining the molded body at a temperature in a range of 1,370° C. or more and 1,600° C. or less to obtain a first sintered body.

Abstract: An indoor unit includes axial-flow fans, which are provided on downstream of an air inlet. Further, a plurality of first bars are provided to the air inlet. In plan view, leading edge portions of blades of the axial-flow fan are inclined in a direction of rotation of the axial-flow fan from a rotary shaft side of the axial-flow fan to an outer peripheral side. Further, in plan view, the plurality of the first bars are inclined in a direction opposite to the direction of rotation of the axial-flow fan from the rotary shaft side of the axial-flow fan to the outer peripheral side.

Abstract: A fan includes an impeller including a boss that is a rotation center, and a plurality of blades that are provided on an outer peripheral surface of the boss; a motor and a motor fixing portion rotationally driving the impeller; a housing accommodating the impeller; a plurality of stationary blades disposed downstream of the impeller and connecting the motor fixing and the housing; and a connecting portion disposed between the housing and a rotation axis of the impeller, and extending in a rotation direction of the impeller and connecting the plurality of stationary blades. The connecting portion has a recessed portion for passing wind that flows in a radial direction of the impeller.

Abstract: An axial flow fan has a boss portion rotationally driven by a motor; a plurality of rotary blades extending radially from a periphery of the boss portion and configured to force air to flow in a direction of a rotation axis of the motor; and a bellmouth accommodating the plurality of rotary blades, the bellmouth comprising a suction-side round portion having a curved surface expanded in a radial direction of the bellmouth, and a discharge-side round portion having a curved surface expanded in the radial direction of the bellmouth, the plurality of rotary blades each being entirely inclined to have an outer peripheral portion in a downstream side in an airflow direction, entirety of the outer peripheral portion being located on the downstream side in the air flow direction with respect to the suction-side round portion.