Mitsubishi Electric Corporation

Yutaka Aoyama

Yudai Morikawa

Shuhei Mizutani

Takahide Tadokoro

Seiji Nakashima

Yuudai Morikawa

Takuya Matsuda

Keisuke Hokazono

Kosuke Tanaka

Takeshi Hatomura

Naomichi Tamura

Kazuhisa Iwasaki

Takahiro Iinuma

Misaki Koda

Shinji Oka

Shinji Kobayashi

Yoji Onaka

Ryota Akaiwa

Takumi Nishiyama

Takahiro Yano

Yu Tamaki

Kohei Najima

Keizo Kamada

Kei Furukubo

Motoya Nakahara

In an air-conditioning apparatus, an outdoor unit installed in an outdoor space and an indoor unit installed in an indoor space are connected by refrigerant pipes to form a refrigerant circuit. One or more pairs of valve kits are provided at the refrigerant pipes by which the outdoor unit and the indoor unit are connected, and allow a pair of additional refrigerant pipes on an inflow side and an outflow side to be connected to one of the one or more pairs of valve kits, the pair of additional refrigerant pipes being additionally provided to enable a new indoor unit to be added after installation of the air-conditioning apparatus. The valve kits of the one or more pairs of valve kits have respective distal end portions that are inclined upwards relative to a horizontal direction. The distal end portions each allow an associated one of the additional refrigerant pipe to be connected to the distal end portion.

Air-conditioning apparatus

An outdoor unit for an air-conditioning apparatus includes a body frame having, in a side face, an air inlet from which outside air is suctioned, the body frame including a hanger-receiving portion in an upper part, the hanger-receiving portion including a beam-like supporting part; an outdoor heat exchanger provided inside the body frame and extending along the air inlet; a hanging portion engaging with the outdoor heat exchanger; and a connecting element connecting the hanger-receiving portion and the hanging portion to each other. The outdoor heat exchanger is supported by the hanger-receiving portion through the hanging portion and the connecting element.

Outdoor unit for air-conditioning apparatus

A heat exchanger group includes a first heat exchanger, a second heat exchanger, and a third heat exchanger. In a cooling operation, refrigerant discharged from the compressor is divided into two. One refrigerant is delivered to the second heat exchanger, and the other refrigerant is delivered to the third heat exchanger. The second heat exchanger performs heat exchange to turn the refrigerant into two-phase refrigerant. The third heat exchanger performs heat exchange to turn the refrigerant into two-phase refrigerant. The refrigerant that has flowed through the second heat exchanger and the refrigerant that has flowed through the third heat exchanger meet, and the resultant refrigerant is delivered to the first heat exchanger. The first heat exchanger performs heat exchange, so that the two-phase refrigerant turns into liquid refrigerant and flows through the first heat exchanger.

Refrigerant cycle apparatus and air conditioning apparatus including the same

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.

Air-sending device and air-conditioning apparatus using the same

An air-conditioning apparatus comprises an indoor unit including an indoor-side heat exchanger and an outdoor unit including a compressor, an outdoor-side heat exchanger and a flow switching device configured to switch a flow of refrigerant from the compressor to the indoor-side heat exchanger or the outdoor-side heat exchanger according to which of the heating operation and the defrosting operation is performed, the outdoor unit including a bypass connected to a heat transfer tube arranged at a lowermost stage of the outdoor-side heat exchanger and supplies the refrigerant from the compressor, and a drain pan arranged below the outdoor-side heat exchanger, the drain pan extending in a direction in which fins of the outdoor-side heat exchanger are stacked, and including a drain path inclined downward from one end to the other end in a longitudinal direction, and left and right side wall portions interposing the drain path therebetween.

An air-conditioning-apparatus outdoor unit includes a casing, a heat exchanger disposed in upper part of an inner space of the casing, a bottom plate located at a bottom of the casing and having a drain hole through which drain water that is generated on the heat exchanger is discharged outside, a support disposed in the inner space of the casing and supporting the heat exchanger in the upper part of the inner space of the casing, and a drain structure disposed under the heat exchanger and guiding the drain water to the bottom plate.

An outdoor unit for an air-conditioning apparatus is provided in which heat-exchanger units can be arranged such that a heat exchanger has a further increased capacity in a casing of a limited size while the volume of air to be fed to the heat exchanger is maximized. An outdoor unit for an air-conditioning apparatus includes a casing having a rectangular plan-view shape formed of a front portion, a left portion, and a rear portion; a heat exchanger provided in the casing and including a plurality of parts each having a rectangular plan-view shape; and a plurality of air-sending fans provided above a plurality of air inlet spaces, respectively, the air inlet spaces each being provided on an inner side of a corresponding one of the plurality of rectangular parts of the heat exchanger.

A blower apparatus includes a propeller fan configured to rotate about a rotational axis, and a bell mouth annularly disposed to surround the propeller fan as seen in a direction of the rotational axis of the propeller fan. The bell mouth includes a flare portion located downstream of the propeller fan The flare portion has at least one first part and at least one second part. The first part has a first inner circumferential surface region. The second part as a second inner circumferential surface region. A first length of the first part inner circumferential surface region in the direction of the rotational axis is greater than a second length of the second part inner circumferential surface region in the direction of the rotational axis.

Blower apparatus

Outdoor units for air conditioners

An air-conditioning apparatus includes a main circuit in which a compressor, a refrigerant flow switching device, a load side heat exchanger, a load side expansion device, and a plurality of heat source side heat exchangers are sequentially connected. When the plurality of heat source side heat exchangers are used as condensers, the first heat source side heat exchanger and the second heat source side heat exchanger are connected in series. When the plurality of heat source side heat exchangers are used as evaporators, the first heat source side heat exchanger and the second heat source side heat exchanger are connected in parallel. A distribution adjustment header on an inlet side of at least either the first heat source side heat exchanger or the second heat source side heat exchanger when the plurality of heat source side heat exchangers are used as evaporators.

An outdoor unit for an air-conditioning apparatus prevents dew condensation water from remaining at a lower portion of a heat exchanger and prevents the flow rate of air passing through the heat exchanger from being decreased, and a method of producing the outdoor unit for an air-conditioning apparatus. The outdoor unit includes a housing including a bottom plate, and a frame at an upper end portion of the housing, a heat exchanger including a plurality of fins arranged in parallel at intervals and heat-transfer pipes penetrating the plurality of fins, and a support member including a first support portion engaged with the frame, a fourth support piece perpendicularly extending from the first support portion, and an engagement piece erected on the fourth support piece and holding the heat-transfer pipes, and the support member supports the heat exchanger such that the heat exchanger is away from the bottom plate.

Outdoor unit for air-conditioning apparatus and method of producing outdoor unit for air-conditioning apparatus

An axial flow fan according to the present invention includes a plurality of blades, each of the blades including: a leading edge formed in front in a direction of rotation of the axial flow fan; an inner circumferential edge formed at an inner circumference of the blades; and an outer circumferential edge formed at an outer circumference of the blades, the outer circumferential edge configured to be at downstream of a fluid, forced to move by the axial flow fan, than the inner circumferential edge, the blade being reflexed toward upstream of the fluid at a portion adjacent to the outer circumferential edge, and having a local angle-decrease section having a blade inlet angle &#x3b1; at the leading edge decreasing from neighborhood, the local angle-decrease section being formed at a side of the leading edge and being located closer to the outer circumferential edge than to the inner circumferential edge.

Axial flow fan and air-conditioning apparatus including the same

An air-conditioning apparatus, including: a heat source-side heat exchanger including a plurality of heat transfer tubes each having a flattened shape and being arranged in parallel, the heat source-side heat exchanger being used at least as a condenser of a refrigeration cycle; and an outdoor fan for generating flows of air passing through the heat source-side heat exchanger in a predetermined air velocity distribution. The heat source-side heat exchanger is configured to exchange heat between the air and refrigerant flowing through the heat transfer tubes and includes a plurality of refrigerant paths, each including at least one of the plurality of heat transfer tubes and a plurality of two-phase paths for allowing gas refrigerant to flow into and out as two-phase refrigerant; and a plurality of liquid-phase paths for allowing the two-phase refrigerant flowing out of the plurality of two-phase paths to flow out as subcooled liquid refrigerant.

Air-Conditioning apparatus

Propeller fan

An outdoor unit being part of a refrigeration cycle apparatus in which refrigerant circulates and having a maintenance opening port includes an open-close panel configured to cover the maintenance opening port by being attached openably and closably to the outdoor unit, a heat source side heat exchanger disposed above the maintenance opening port and provided at least with an open-close panel-facing heat exchange unit facing a plane containing the open-close panel, a drainage channel located at least below the open-close panel-facing heat exchange unit of the heat source side heat exchanger, wherein the heating energy supply unit includes a refrigerant pipe configured to pass refrigerant higher in temperature than a freezing point of water in an upstream direction from a downstream direction of the drainage channel.

Growing community of inventors

Tokyo, Japan

Yutaka Aoyama