Abstract: A heat exchanger is configured such that flat tubes in at least two levels bent or connected to each other at one end in an axial direction of the flat tubes and the flat tubes in at least two columns connected to each other are included in refrigerant passages through which refrigerant flows, and a flow direction of gas is counter to flow of refrigerant through the refrigerant passages in a column direction while the heat exchanger serves as a condenser.

Abstract: A multi-room air-conditioning apparatus includes an outdoor unit, a relay unit connected to an outdoor unit by first and second connection pipes, and a plurality of indoor units connected to the relay unit. The outdoor unit includes a second gas-liquid separating device provided on the suction side of the compressor. The suction side of the compressor and the second gas-liquid separating device are connected to each other by a gas-side outlet pipe and a liquid-side outlet pipe.

Abstract: A flat tube heat exchange apparatus that has flat tubes arranged at a regular pitch in the step direction which is orthogonal to the row direction of fins. If the step direction pitch of the flat tubes is defined as Dp, the coefficient of Dp is k, and if 0<k<0.5 or 0.5<k<1, the distance between a fin end at one side in the step direction of the fins, and the center of a flat tube in the thickness direction is k·Dp, and the distance between a fin end at the other side in the step direction of the fins, and the center of a flat tube in the thickness direction is (1?k)·Dp.

Abstract: A heat exchanger is configured such that flat tubes in at least two levels bent or connected to each other at one end in an axial direction of the flat tubes and the flat tubes in at least two columns connected to each other are included in refrigerant passages through which refrigerant flows, and a flow direction of gas is counter to flow of refrigerant through the refrigerant passages in a column direction while the heat exchanger serves as a condenser.

Abstract: A flat tube heat exchange apparatus that has flat tubes arranged at a regular pitch in the step direction which is orthogonal to the row direction of fins. If the step direction pitch of the flat tubes is defined as Dp, the coefficient of Dp is k, and if 0<k<0.5 or 0.5<k<1, the distance between a fin end at one side in the step direction of the fins, and the center of a flat tube in the thickness direction is k·Dp, and the distance between a fin end at the other side in the step direction of the fins, and the center of a flat tube in the thickness direction is (1?k)·Dp.

Abstract: A refrigerant distribution device is provided for distributing refrigerant to a plurality of heat transfer tubes that constitute a heat exchanger. The refrigerant distribution device includes a first distribution device dividing refrigerant into a plurality of portions, and a plurality of two-way branch pipes each dividing refrigerant divided by the first distribution device into two portions to flow into two of the plurality of heat transfer tubes.

Abstract: A multi-room air-conditioning apparatus includes an outdoor unit, a relay unit connected to an outdoor unit by first and second connection pipes, and a plurality of indoor units connected to the relay unit. The outdoor unit includes a second gas-liquid separating device provided on the suction side of the compressor. The suction side of the compressor and the second gas-liquid separating device are connected to each other by a gas-side outlet pipe and a liquid-side outlet pipe.

Abstract: A heat exchanger includes a plurality of fins stacked with a predetermined fin pitch between them, and a plurality of heat transfer tubes which extend through the fins in the stack direction and have a flat cross-sectional shape, wherein the fins have a plurality of notches in a shape corresponding to the cross-sectional shape of the heat transfer tube on an end portion in the longitudinal direction, a collar is formed on an edge of the plurality of notches, the heat transfer tubes are inserted into the notches, a fin pitch between a portion of the plurality of fins is larger than a fin pitch between the other portion of the fins, and the larger fin pitch is larger than at least the height of the collar.

Abstract: Heat exchanger assemblies included in an outdoor unit each include fins each having notches provided without fin collars or notches provided with fin collars that are shorter than stacking intervals between the fins. At least some of the stacking intervals between the fins in a facing surface are larger than the stacking intervals between the fins in surfaces excluding the facing surface.

Abstract: A propeller fan rotates about a vertical axis. A bellmouth has a wall extending such that an air passage on an outlet side spreads outward. The bellmouth has a shape satisfying: H/D?0.04 between a length H of the sloping surface in a direction of the rotation axis from an end on an inlet; side to an end on the outlet side and a fan diameter D of the propeller fan 0<??60° for an angle ? formed between a line connecting the ends of the sloping surface and the rotation axis; and L/L0?0.5 between a length L in the direction of the rotation axis from an opening on the inlet side to the end of the sloping surface on the inlet side and a length L0 of the blades of the propeller fan in the direction of the rotational axis.

Abstract: This invention relates to an air conditioner having an air inlet at its upper portion. The heat exchanger (4) includes multiple plate fins (1) arranged in parallel so that air flows therebetween, and heat transfer tubes (2) perpendicularly inserted into the plate fins (1) and arranged perpendicularly to the air flow direction through which working fluid passes. The heat exchanger (4) includes a lower front heat exchanger (4a), an upper front heat exchanger (4b), and a rear heat exchanger (4c) separately produced and arranged to surround the circulating fan (5). The air pressure loss of the lower front heat exchanger (4a) is set to be smaller than the air pressure losses of the other heat exchangers.

Abstract: To provide an air conditioner capable of reducing an input power and a rotational speed of a fan motor necessary for obtaining a predetermined flow rate from an indoor unit. An air conditioner includes an indoor unit 8 having at least one inlet 6 and one outlet 8; a cross-flow fan 1 connected to a fan motor; a front heat exchanger 2; and a back heat exchanger 3, wherein an installation angle ? of the front heat exchanger 2 positioned above the rotational center of the cross-flow fan 1 relative to the horizon is 65°???90°, a point of the back heat exchanger 3 closest to the front heat exchanger 2 is located adjacent to the front heat exchanger 2 from the rotational center of the cross-flow fan 1, and an outlet angle ?2 of a blade of the cross-flow fan 1 is 22°??2?28°.

Abstract: In an air conditioner, reverse inhalation is prevented while broad band noise and wind sound are reduced. A projection arranged at the leading end of a stabilizer on the downstream side of an air stream flowing along a surface of the stabilizer opposing an impeller and protrudes toward the impeller to define the shortest distance to the impeller. A plurality of grooves or projections are provided on the opposing surface on the upstream side of the projection to disturb the air stream flowing along the opposing surface. The positions of the grooves or the projections are arranged apart in a rotational axis direction. A plurality of convex portions are provided to disturb an air stream flowing along a surface of a casing opposing the impellers. The positions of the convex portions are arranged apart in the rotational axis direction of the impeller.

Abstract: In an air conditioner, reverse inhalation is prevented while broad band noise and wind sound are reduced. There are provided a projection 12b arranged at the leading end of a stabilizer 12 on the downstream side of an air stream F flowing along a surface 12a of the stabilizer opposing an impeller so as to protrude toward the impeller to define the shortest distance to the impeller, and a plurality of grooves 12e or projections provided on the opposing surface on the upstream side of the projection 12b so as to disturb the air stream flowing along the opposing surface 12a. The positions of the grooves 12e or the projections are arranged apart in a rotational axis direction E. A plurality of convex portions are provided so as to disturb an air stream flowing along a surface of a casing opposing the impeller, and the positions of the convex portions are arranged apart in the rotational axis direction of the impeller.

Abstract: To provide an air conditioner capable of reducing an input power and a rotational speed of a fan motor necessary for obtaining a predetermined flow rate from an indoor unit. An air conditioner includes an indoor unit 8 having at least one inlet 6 and one outlet 8; a cross-flow fan 1 connected to a fan motor; a front heat exchanger 2; and a back heat exchanger 3, wherein an installation angle a of the front heat exchanger 2 positioned above the rotational center of the cross-flow fan 1 relative to the horizon is 65°???90°, a point of the back heat exchanger 3 closest to the front heat exchanger 2 is located adjacent to the front heat exchanger 2 from the rotational center of the cross-flow fan 1, and an outlet angle ?2 of a blade of the cross-flow fan 1 is 22°??2?28°.

Abstract: This invention relates to an air conditioner having an air inlet at its upper portion. The heat exchanger (4) includes multiple plate fins (1) arranged in parallel so that air flows therebetween, and heat transfer tubes (2) perpendicularly inserted into the plate fins (1) and arranged perpendicularly to the air flow direction through which working fluid passes. The heat exchanger (4) includes a lower front heat exchanger (4a), an upper front heat exchanger (4b), and a rear heat exchanger (4c) separately produced and arranged to surround the circulating fan (5). The air pressure loss of the lower front heat exchanger (4a) is set to be smaller than the air pressure losses of the other heat exchangers.