Blower

A blower, comprising:

• a motor;
• a plurality of fans coaxially arranged in multiple stages and configured to compress and blow air by rotating around a specified rotational axis when the motor is driven;
• a housing that houses the motor and the fans, the housing having an inlet opening through which the air is sucked into the housing and a discharge opening through which the air compressed and blown by the fans is discharged;
• and
• a battery mounting part to which a battery for supplying power to the motor is removably mountable, wherein:
• a rotational speed of the motor is within a range of 50,000 rpm to 120,000 rpm,
• a diameter of each of the fans is within a range of 30 mm to 70 mm,
• an area of the discharge opening is within a range of not less than an area of a circle having a diameter of 2.5 mm and not more than an area of a circle having a diameter of 10 mm,
• a blowing force of the air discharged through the discharge opening is within a range of 1 N to 3 N,
• each of the fans is a centrifugal fan,
• the blower further includes:
• a plurality of partition plates respectively disposed on suction sides of the fans in a direction of the rotational axis and defining boundaries of regions corresponding to the fans, the partition plates each having a communication hole located on the rotational axis, and
• at least one flow-guide member disposed between the fans in the axial direction and configured to guide the air in a specific direction,
• each of the fans includes:
• a disc-like back plate having a first surface on a suction side and a second surface on a side opposite to the first surface, and
• a plurality of vanes protruding from the first surface,
• the at least one flow-guide member each includes:
• a disc-like base plate arranged to face the second surface of the back plate and having a third surface facing the second surface and a fourth surface on a side opposite to the third surface, and
• a plurality of protrusions protruding from the base plate and configured to guide the air in a specific direction, and
• all of the plurality of protrusions are on the fourth surface of the base plate and configured as a plurality of guide vanes configured to guide the air toward a communication hole of a partition plate corresponding to the centrifugal fan of a next stage.