Split-type range hood having relay fan for cooling circuit board

A split-type range hood, comprising:

• a range hood body, wherein the range hood body includes a chassis and a smoke collecting box, the chassis has an intake opening, the smoke collecting box is disposed on the chassis, the smoke collecting box covers the intake opening, the smoke collecting box has an exhaust opening, and the exhaust opening of the smoke collecting box is in air communication with the intake opening of the chassis;
• an air duct;
• and
• a relay fan, wherein the relay fan is disposed outside of the range hood body, and includes:
• a suction motor, wherein the suction motor includes an outer housing and a motor body, and the outer housing has a first opening and a second opening that are opposite to each other;
• wherein one end of the air duct is in air communication with the exhaust opening, and another end of the air duct is in air communication with the first opening;
• wherein the motor body is disposed in the outer housing, and an outlet that corresponds in position to the second opening is formed at one end of the motor body;
• a heat-dissipation base disposed on the outer housing of the suction motor;
• and
• a circuit board, wherein the circuit board is electrically connected to the motor body of the suction motor, and is disposed on the heat-dissipation base, so that the circuit board is cooled by cooling the heat-dissipation base with a suction airflow of the suction motor during operation.