According to one embodiment, this outdoor unit of an air conditioner includes a compressor, a heat exchanger, an expansion valve, a blower fan, electrical components, and a heat sink. The heat exchanger includes a first group constituted of at least one of the plurality of heat exchangers and a second group constituted of at least one of the plurality of heat exchangers not belonging to the first group. The expansion valve includes a first expansion valve and a second expansion valve. The heat sink is arranged on the flow path of the refrigerant on the upstream side of a confluence position of the refrigerant branches condensed by the heat exchangers of the first group and the second group and on the downstream side of the second expansion valve.

The electric control box includes a box body, a mounting plate, a heat sink, an electronic component and a heat dissipation fan. The box body is provided with a mounting cavity. The mounting board is arranged in the mounting cavity to form a first chamber and a second chamber located on two sides of the mounting board. A first air vent and a second air vent are arranged on the mounting board and are spaced apart. The first air vent and the second air vent are connected to the first chamber and the second chamber. The heat sink is at least partially arranged in the first chamber. The electronic component is arranged in the second chamber and in thermally conductive connection with the heat sink. The heat dissipation fan is used for blowing air and from the first chamber into the second chamber via the first air vent.

The electric control box includes a box body, a mounting plate, a heat sink, an electronic component and a heat dissipation fan. The box body is provided with a mounting cavity. The mounting board is arranged in the mounting cavity to form a first chamber and a second chamber located on two sides of the mounting board. A first air vent and a second air vent are arranged on the mounting board and are spaced apart. The first air vent and the second air vent are connected to the first chamber and the second chamber. The heat sink is at least partially arranged in the first chamber. The electronic component is arranged in the second chamber and in thermally conductive connection with the heat sink. The heat dissipation fan is used for blowing air and from the first chamber into the second chamber via the first air vent.

In a primary heat exchanger, a heat conduction pipe is arranged as one connected pipe in a lower stage and an upper stage in a manner extending back and forth through a plurality of fins. The heat conduction pipe is arranged such that a pitch between the heat conduction pipes in the upper stage is shorter than a pitch between the heat conduction pipes in the lower stage. In addition, the heat conduction pipe is arranged such that a position in a center of each heat conduction pipe in the upper stage in a second direction orthogonal to a first direction in which the heat conduction pipe extends and a position in a center of each heat conduction pipe in the lower stage in the second direction are displaced from each other.

In a primary heat exchanger, a heat conduction pipe is arranged as one connected pipe in a lower stage and an upper stage in a manner extending back and forth through a plurality of fins. The heat conduction pipe is arranged such that a pitch between the heat conduction pipes in the upper stage is shorter than a pitch between the heat conduction pipes in the lower stage. In addition, the heat conduction pipe is arranged such that a position in a center of each heat conduction pipe in the upper stage in a second direction orthogonal to a first direction in which the heat conduction pipe extends and a position in a center of each heat conduction pipe in the lower stage in the second direction are displaced from each other.

An air-conditioner control system is obtained that includes an air conditioner main body including an air conditioning function, a power-supply circuit unit, a control board mounted with an electronic component including a microcomputer for control, a temperature sensor that measures temperature of the electronic component, and a temperature control unit that heats, during normal operation, on the basis of a measurement value of the temperature sensor, the electronic component such that operation is performed at temperature equal to or higher than a guarantee temperature of the electronic component. Therefore, a target component can always be used within a guarantee temperature range of a manufacturer during normal operation of an air conditioner.

The electric control box includes a box body, a mounting plate, a radiator, an electronic component and a cooling fan; the box body is provided with a mounting chamber, the mounting plate is arranged in the mounting chamber and the mounting chamber forms a first chamber and a second chamber which are located at two sides of the mounting plate, the mounting plate is provided with a first ventilation opening and a second ventilation opening which are spaced apart, the first ventilation opening and the second ventilation opening enables communication between the first chamber and the second chamber; the radiator is at least partially arranged in the first chamber; the electronic component is arranged in the second chamber and is in heat conducting connection with the radiator; and the cooling fan is used for supplying air.

An air conditioner is provided. The air conditioner may include an electronic device, which may include a control component to drive a refrigerant cycle, and a cooling tube through which a refrigerant to cool the electronic device may flow. The cooling tube may be coupled to one side of the electronic device. The electronic device may include an electronic case having at least one through hole, an electronic board to which the control component may be coupled, the electronic board being disposed in the electronic case, at least one heat transfer plate disposed to contact the control component, the at least one heat transfer plate being coupled to the electronic case, and at least one heat sink, to which the cooling tube may be coupled, the at least one heat sink contacting the at least one heat transfer plate through the at least one through hole.

A refrigerant pipe attachment structure is provided, in which it can be ensured that a refrigerant pipe is held and thermal resistance between the refrigerant pipe and a heat transfer member can be sufficiently reduced. A heat transfer member formed with an elongated groove into which a refrigerant pipe is fitted and thermally contacting a cooling target is provided. An elastic member formed in an elongated plate shape extending along an extension direction of the refrigerant pipe and including a pipe-facing part facing the refrigerant pipe is provided. A pressing mechanism configured to press the elastic member toward the heat transfer member is provided.

A refrigerant pipe attachment structure is provided, in which it can be ensured that a refrigerant pipe is held and thermal resistance between the refrigerant pipe and a heat transfer member can be sufficiently reduced. A heat transfer member formed with an elongated groove into which a refrigerant pipe is fitted and thermally contacting a cooling target is provided. An elastic member formed in an elongated plate shape extending along an extension direction of the refrigerant pipe and including a pipe-facing part facing the refrigerant pipe is provided. A pressing mechanism configured to press the elastic member toward the heat transfer member is provided.