Outdoor unit of air conditioner

An outdoor unit of an air conditioner, comprising:

• a heat exchange room including a heat exchanger;
• a machine room partitioned from the heat exchange room;
• a control box positioned in the machine room and configured to accommodate electronic components;
• a heat sink installed in the control box;
• and
• a duct positioned within the machine room, wherein the duct comprises:
• a duct inlet connected to the machine room;
• a duct outlet connected to the heat exchange room;
• and
• a duct flow path positioned between the duct inlet and the duct outlet and passing through the heat sink,
• wherein the duct flow path comprises:
• a first flow path formed inside the duct and extending from the duct inlet in a first direction and passing through a part of the heat sink adjacent to the duct inlet;
• and
• a second flow path formed inside the duct and positioned in the first direction with respect to the first flow path and passing through another part of the heat sink,
• wherein a width of the second flow path in a second direction different from the first direction is greater than a width of the first flow path in the second direction, and
• wherein the second flow path extends toward the duct outlet along a third direction different from the first direction and the second direction.

An outdoor unit of an air conditioner, comprising:

• a housing including a heat exchange room and a machine room;
• a partition configured to partition the heat exchange room from the machine room;
• a fan positioned in the heat exchange room;
• a control box positioned in the machine room and configured to accommodate a printed circuit board;
• a plurality of heat transfer plates extending in a first direction from one sides being adjacent to the printed circuit board and arranged to be spaced apart from each other in a second direction different from the first direction;
• and
• a duct positioned in the machine room and connected to the heat exchange room through the partition;
• wherein the duct comprises:
• a duct inlet through which air is configured to flow into inside of the duct;
• a duct outlet connected to the partition and configured to discharge air to the heat exchange room;
• and
• a duct flow path passing through the plurality of heat transfer plates between the duct inlet and the duct outlet,
• wherein the duct flow path comprises:
• a first flow path formed inside the duct and extending from the duct inlet in a third direction different from the first direction and the second direction, along a part of the plurality of heat transfer plates, adjacent to the duct inlet;
• and
• a second flow path formed inside the duct and extending along the second direction such that air from the plurality of heat transfer plates is configured to flow toward the duct outlet.