Outdoor unit of air conditioner

An outdoor unit of an air conditioner, comprising:

• a housing comprising a front panel, a back panel, a top plate, a service panel and a bottom plate,
• wherein an inside of the housing is divided by a partition plate extending between the bottom plate and the top plate, into a blower chamber housing therein at least a heat exchanger and a blower fan, and a mechanical chamber housing therein at least a compressor and an electrical component box,
• the compressor is disposed at a lower part of the mechanical chamber,
• the electrical component box is disposed at an upper part of the mechanical chamber,
• the partition plate comprises
• an upper partition plate partitioning the upper part of the mechanical chamber from the blower chamber and
• a lower partition plate partitioning the lower part of the mechanical chamber from the blower chamber,
• the electrical component box comprises
• the upper partition plate,
• a front plate disposed along an inner surface of the service panel, said service panel covers a front side of the electrical component box, and
• a box base plate that receives a lower end part of the upper partition plate, said box base plate receives a lower portion of the front plate and said box base plate is fixed to an upper end surface of the lower partition plate,
• the box base plate is provided with a flange in a periphery of said box base plate, the flange extending downwardly,
• a part of the flange has a corresponding shape to the upper end surface of the lower partition plate and is received on the upper end surface of the lower partition plate, and
• the electrical component box is set in the mechanical chamber and the part of the flange is fitted to the lower partition plate.