Abstract: To predict and detect a failure in a compressor provided in an air conditioner, the air conditioner is provided with: a heat exchanger; the compressor; piping connecting the heat exchanger and the compressor with each other; and a control unit controlling the compressor and having a compressor failure predicting and detecting means, and in this air conditioner, the compressor failure predicting and detecting means of the control unit includes: a current detecting part detecting a driving current driving the compressor; a pulsation detecting part detecting pulsation in a driving current detected by the current detecting part; and an anomaly determining part predicting or detecting any failure in the compressor based on a magnitude and a duration of pulsation in a driving current detected by the pulsation detecting part.

Abstract: An air conditioner that includes a heat exchanger including: heat-transfer pipes extending in a horizontal direction and spaced apart at predetermined intervals in a vertical direction and configured to allow a thermal medium to flow therein. A part of the heat transfer pipes are used for at least one inflow path into which the thermal medium flows from the outside of the heat exchanger and the other part of the heat transfer pipes are used for at least one outflow path from which the thermal medium flows out to the outside. At least one connection pipe through which an outlet side of one of the at least one inflow path communicates with an inlet side of one of the at least one outflow path.

Abstract: Provided is an outdoor unit providing: a housing; multiple heat transfer pipes; multiple fins arranged in a heat transfer pipe direction and provided at the multiple heat transfer pipes; header pipe assemblies each connected to both ends of each heat transfer pipe; a support bracket provided between an outermost one of the fins in the heat transfer pipe direction and each header pipe assembly to block air passage in a space provided with no fins and fixed to the housing to support the heat transfer pipes and the fins; and a fixing member attached to the support bracket and serving as a fixing position for fixing the support bracket to the housing, wherein the fixing member has an insulating portion for insulating the support bracket and the housing from each other.

Abstract: Manufacturing a heat exchanger by brazing of multiple heat transfer pipes, multiple fins, and headers. The multiple heat transfer pipes joined to each fin with the heat transfer pipes each being inserted into cutout recessed portions as cutouts of side portions of the fins on one side. The headers each joined to both end portions of each heat transfer pipe to couple the multiple heat transfer pipes and having internal spaces for collecting or distributing fluid flowing in the multiple heat transfer pipes. A protruding length Tf of each fin from a corresponding one of the heat transfer pipes and a distance Th from each heat transfer pipe to an outer surface of a corresponding one of the headers on the same side as a protrusion are substantially equal to each other.

Abstract: Heat transfer pipes 26b1 and 26b2 extend from the other end section 21B to one end section 21A in an intermediate row L2 and combine in the one end section 21A to be heat transfer pipes 26c1 and 26c2. The heat transfer pipes 26c1 and 26c2 are configured to extend back and force once between the one end section 21A and the other end section 21B in a upstream row L1. Heat transfer pipes 26b3 and 26b4 extend from the other end section 21B to the one end section 21A in the intermediate row L2 and combine in the one end section 21A to be heat transfer pipes 26c3 and 26c4. The heat transfer pipes 26c3 and 26c4 are configured to extend back and force once between the one end section 21A and the other end section 21B in the upstream row L1. The heat transfer pipe 26c2 extending from the other end section 21B to the one end section 21A and the heat transfer pipe 26c4 from the other end section 21B to the one end section 21A are arranged to be adjacent to each other.

Abstract: An air conditioner capable of detecting resonance of a casing of an outdoor or indoor unit of an air conditioner at a low cost with high accuracy is provided. An outdoor unit of the air conditioner includes: a propeller fan that blows air to a heat exchanger; a fan motor that drives the propeller fan; a current detector that detects a current value of the fan motor; a phase detector that detects the magnetic pole position of the fan motor; a fan rotation speed detector that detects the rotation speed of the fan motor; a pulsation detector that detects pulsation of the current value; and a resonance determiner that determines resonance of a system of a casing of the outdoor unit having the fan motor. If the resonance determiner determines resonance, a controller executes resonance avoidance control for increasing or decreasing the fan rotation speed by a predetermined rotation speed.

Abstract: An outdoor device is provided which has: a heat exchanger including a heat exchange portion having multiple heat transfer pipes and multiple heat transfer fins joined to the heat transfer pipes, and a pair of header pipe assemblies arranged substantially in parallel along the upper-to-lower direction to face each other and configured to bundle end portions of the heat transfer pipes extending from the heat exchange portion; and a housing configured to support the heat exchanger via a support bracket. The support bracket includes a heat exchange side holding portion, a housing side holding portion, and a fin contact portion provided integrally with the heat exchange side holding portion or the housing side holding portion and arranged in contact with or in proximity to an edge portion of the heat exchange portion adjacent to one of the header pipe assemblies.

Abstract: The air conditioner includes: an outdoor unit that includes a compressor, an outdoor heat exchanger, and an outdoor expansion valve; an indoor unit that includes an indoor heat exchanger and an indoor expansion valve; a liquid pipe that connects the outdoor unit to the indoor unit; and a gas pipe that connects the outdoor unit to the indoor unit. One end of the outdoor heat exchanger is coupled to the liquid pipe through the outdoor expansion valve. One end of the indoor heat exchanger is coupled to the liquid pipe through the indoor expansion valve. When a predetermined period of time elapses after the compressor is shut down, the outdoor expansion valve and the indoor expansion valve both close.

Abstract: To predict and detect a failure in a compressor provided in an air conditioner, the air conditioner is provided with: a heat exchanger; the compressor; piping connecting the heat exchanger and the compressor with each other; and a control unit controlling the compressor and having a compressor failure predicting and detecting means, and in this air conditioner, the compressor failure predicting and detecting means of the control unit includes: a current detecting part detecting a driving current driving the compressor; a pulsation detecting part detecting pulsation in a driving current detected by the current detecting part; and an anomaly determining part predicting or detecting any failure in the compressor based on a magnitude and a duration of pulsation in a driving current detected by the pulsation detecting part.

Abstract: An air conditioner that includes a heat exchanger including: heat-transfer pipes extending in a horizontal direction and spaced apart at predetermined intervals in a vertical direction and configured to allow a thermal medium to flow therein. A part of the heat transfer pipes are used for at least one inflow path into which the thermal medium flows from the outside of the heat exchanger and the other part of the heat transfer pipes are used for at least one outflow path from which the thermal medium flows out to the outside. At least one connection pipe through which an outlet side of one of the at least one inflow path communicates with an inlet side of one of the at least one outflow path.

Abstract: An air conditioner capable of detecting resonance of a casing of an outdoor or indoor unit of an air conditioner at a low cost with high accuracy is provided. An outdoor unit of the air conditioner includes: a propeller fan that blows air to a heat exchanger; a fan motor that drives the propeller fan; a current detector that detects a current value of the fan motor; a phase detector that detects the magnetic pole position of the fan motor; a fan rotation speed detector that detects the rotation speed of the fan motor; a pulsation detector that detects pulsation of the current value; and a resonance determiner that determines resonance of a system of a casing of the outdoor unit having the fan motor. If the resonance determiner determines resonance, a controller executes resonance avoidance control for increasing or decreasing the fan rotation speed by a predetermined rotation speed.

Abstract: Heat transfer pipes 26b1 and 26b2 extend from the other end section 21B to one end section 21A in an intermediate row L2 and combine in the one end section 21A to be heat transfer pipes 26c1 and 26c2. The heat transfer pipes 26c1 and 26c2 are configured to extend back and force once between the one end section 21A and the other end section 21B in a upstream row L1. Heat transfer pipes 26b3 and 26b4 extend from the other end section 21B to the one end section 21A in the intermediate row L2 and combine in the one end section 21A to be heat transfer pipes 26c3 and 26c4. The heat transfer pipes 26c3 and 26c4 are configured to extend back and force once between the one end section 21A and the other end section 21B in the upstream row L1. The heat transfer pipe 26c2 extending from the other end section 21B to the one end section 21A and the heat transfer pipe 26c4 from the other end section 21B to the one end section 21A are arranged to be adjacent to each other.

Abstract: Provided herein is an air conditioner in which the acid scavenger in a refrigeration cycle is maintained over extended time periods of operation to improve reliability. The air conditioner includes a compressor 11 for compressing a refrigerant, an outdoor heat exchanger 13 for causing a heat exchange between the refrigerant and outdoor air, an indoor heat exchanger 31 for causing a heat exchange between the refrigerant and indoor air, and an expansion valve for decompressing the refrigerant. The compressor 11, the outdoor heat exchanger 13, the indoor heat exchanger 31, and the expansion valve are connected to one another with pipes to constitute a refrigeration cycle. The air conditioner uses a refrigerator oil that uses a polyol ester oil as a base oil, and that contains an alkyl glycidyl ether compound having an epoxy group.

Abstract: Heat transfer pipes 26b1 and 26b2 extend from the other end section 21B to one end section 21A in an intermediate row L2 and combine in the one end section 21A to be heat transfer pipes 26c1 and 26c2. The heat transfer pipes 26c1 and 26c2 are configured to extend back and force once between the one end section 21A and the other end section 21B in a upstream row L1. Heat transfer pipes 26b3 and 26b4 extend from the other end section 21B to the one end section 21A in the intermediate row L2 and combine in the one end section 21A to be heat transfer pipes 26c3 and 26c4. The heat transfer pipes 26c3 and 26c4 are configured to extend back and force once between the one end section 21A and the other end section 21B in the upstream row L1. The heat transfer pipe 26c2 extending from the other end section 21B to the one end section 21A and the heat transfer pipe 26c4 from the other end section 21B to the one end section 21A are arranged to be adjacent to each other.