Power tool

A power tool, comprising:

• a housing, defining an air inlet and a heat-dissipation vent defining a first sub heat-dissipation vent and a second sub heat-dissipation vent;
• a motor, received in the housing and disposed adjacent to the first sub heat-dissipation vent, comprising a front end and a rear end, and configured to output a rotation power through the front end;
• a heat-dissipation fan, mounted at the rear end of the motor and capable of rotating and generating a negative pressure;
• a control board, arranged in the housing, located at a rear side of the heat-dissipation fan, and disposed adjacent to the second sub heat-dissipation vent;
• wherein the housing comprises a partition, the partition separates the heat-dissipation vent into the first sub heat-dissipation vent and the second sub heat-dissipation vent, the first sub heat-dissipation vent and the second sub heat-dissipation vent are arranged side-by-side and adjacent to each other, and the first sub heat-dissipation vent is fluidly coupled to the second sub heat-dissipation vent through the partition;
• and
• wherein in case where the heat-dissipation fan rotates and generates a negative pressure, a motor heat-dissipation passage and a control-board heat-dissipation passage independent of the motor heat-dissipation passage are formed, the air inlet is an inlet of a first airflow which is able to flow in the motor heat-dissipation passage, the second sub heat-dissipation vent is an inlet of a second airflow which is able to flow in the control-board heat-dissipation passage, and the first sub heat-dissipation vent is an outlet through which the first airflow and the second airflow are capable of flowing out of the motor heat-dissipation passage and the control-board heat-dissipation passage, respectively;
• wherein the housing comprises a first housing and a second housing engaged with the first housing, each of the first housing and second housing defines the first sub heat-dissipation vent and the second sub heat-dissipation vent, the first sub heat-dissipation vent defined in the first housing and the first sub heat-dissipation vent defined in the second housing are symmetrical to each other, the second sub heat-dissipation vent defined in the first housing and the second sub heat-dissipation vent defined in the second housing are symmetrical to each other, and the heat-dissipation fan and the control board are located between the heat-dissipation vent of the first housing and the heat-dissipation vent of the second housing.

A grass trimmer, comprising:

• a housing, defining a heat-dissipation vent;
• a motor, received in the housing, comprising a front end and a rear end;
• a heat-dissipation fan, mounted at the rear end of the motor and capable of rotating and generating a negative pressure;
• a control board, arranged in the housing, located at a rear side of the heat-dissipation fan;
• wherein the housing comprises a partition located between the motor and the control board, and the partition separates the heat-dissipation vent into a first sub heat-dissipation vent and a second sub heat-dissipation vent adjacent to the first sub heat-dissipation vent, such that when the heat-dissipation fan rotates and generates a negative pressure, a motor heat-dissipation passage and a control-board heat-dissipation passage non-interfered with the motor heat-dissipation passage are formed, and a first airflow and a second airflow are capable of flowing out of the motor heat-dissipation passage and the control-board heat-dissipation passage respectively, from the first sub heat-dissipation vent;
• wherein the motor is disposed in the motor heat-dissipation passage, and the control board is disposed in the control-board heat-dissipation passage;
• the first sub heat-dissipation vent and the second sub heat-dissipation vent are arranged side-by-side and adjacent to each other;
• wherein the partition divides the receiving space into a motor holding cavity and a control-board holding cavity, the motor holding cavity is provided with a first rib portion protruding from the inner wall into the receiving space, and the motor is received in the motor holding cavity and fixed by the first rib portion;
• and the control-board holding cavity is provided with a second rib portion protruding from the inner wall into the receiving space, and the control board is received in the control-board holding cavity and fixed by the second rib portion.