Blower

Patent metadata

Field	Value
Publication number	US-11946484-B2
Application number	US-202117374689-A
Country	US
Kind code	B2
Filing date	Jul 13, 2021
Priority date	Feb 13, 2019
Publication date	Apr 2, 2024
Grant date	Apr 2, 2024

Abstract

A blower includes a motor, a plurality of fans coaxially arranged in multiple stages, a housing having an inlet opening and a discharge opening, and a battery mounting part to which a battery is removably mountable. 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 air discharged through the discharge opening is within a range of 1 N to 3 N.

First claim

What is claimed is:

1. A blower, comprising:
a brushless motor;
a fan configured to blow air by rotating around a rotational axis when the brushless motor is driven;
a housing (i) that houses the brushless motor and the fan and (ii) having an inlet opening that is configured such that the air is sucked into the housing through the inlet opening when the fan is rotated and a discharge opening that is configured such that the air blown by the fan is discharged from the housing through the discharge opening;
a handle protruding from the housing in a first direction orthogonal to the rotational axis of the fan;
a battery mounting part configured to detachably receive and retain a battery for supplying power to the brushless motor; and
a control device configured to control driving of the brushless motor,
wherein:
the brushless motor and the controller are configured such that a rotational speed of the brushless motor is in a range of 50,000 rpm to 120,000 rpm,
the fan has a diameter in a range of 30 mm to 50 mm,
the fan and the housing are configured such that a blowing force of the air discharged through the discharge opening is in a range of 1 N to 3 N,
the handle includes (i) a tubular grip part that (a) is configured to be held by a user, (b) extends in the first direction and (c) has a first end connected to the housing and an opposite second end in the first direction and (ii) a housing part that (a) is connected to the second end of the grip part and (b) has a larger dimension orthogonal to the first direction than the grip part, and
the control device is in the housing part.

2. The blower as defined in claim 1 , wherein 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.

3. The blower as defined in claim 1 , further comprising
a manipulation member configured to be externally manipulated by a user,
wherein the control device is configured to control rotational speed of the brushless motor in response to manipulation of the manipulation member.

Assignees

• Makita Corp

Inventors

• Ojima Akira
• Numata Fumitoshi

Classifications

• F04D29/30 Primary

  Vanes · CPC title

• F04D25/0606

  the electric motor being specially adapted for integration in the pump · CPC title

• F04D25/0673

  Battery powered · CPC title

• F04D25/086

  hand operated · CPC title

• F04D29/281

  for fans or blowers · CPC title