Charger

Patent metadata

Field	Value
Publication number	US-12117015-B2
Application number	US-202117914219-A
Country	US
Kind code	B2
Filing date	Apr 15, 2021
Priority date	Apr 16, 2020
Publication date	Oct 15, 2024
Grant date	Oct 15, 2024

Abstract

A charger may include: a casing including an air inlet and an air outlet; an inner wall extending from an inner surface of the casing and defining an accommodating space between the inner surface of the casing and the inner wall; and a centrifugal fan including an air feed port and disposed in the accommodating space. The air outlet may be disposed to face the air feed port. The air inlet may be disposed closer to the centrifugal fan than the inner wall is. In a direction of a rotation axis of the centrifugal fan, a width between the inner wall and the centrifugal fan may be less than or equal to 150% of a width of the centrifugal fan.

First claim

The invention claimed is:

1. A charger comprising:
a casing including an air inlet and an air outlet;
an inner wall extending from an inner surface of the casing and defining an accommodating space between the inner surface of the casing and the inner wall; and
a centrifugal fan including an air feed port and disposed in the accommodating space,
wherein
the air outlet is disposed to face the air feed port,
the air inlet is disposed closer to the centrifugal fan than the inner wall is, and
in a direction of a rotation axis of the centrifugal fan, a width between the inner wall and the centrifugal fan is less than or equal to 150% of a width of the centrifugal fan.

2. The charger according to claim 1 , wherein in the direction of the rotation axis, the air inlet is disposed between the inner wall and the centrifugal fan.

3. The charger according to claim 2 , wherein
when the charger is placed on a placement plane, air is fed from the air feed port of the centrifugal fan in a down direction perpendicular to the placement plane,
the air outlet is disposed below the air feed port,
in the direction of the rotation axis, the width between the inner wall and the centrifugal fan is less than or equal to 50% of a diameter of a blade unit of the centrifugal fan,
the charger further comprises a rib extending from the inner surface of the casing such that the rib is disposed adjacent to the air outlet,
the centrifugal fan is supported by the rib such that the centrifugal fan is separated from the inner surface of the casing,
the rib is disposed at a peripheral portion of the air feed port of the centrifugal fan,
a recess is defined in an outer surface of the casing, and
the air outlet is disposed in the recess.

4. The charger according to claim 1 , wherein
when the charger is placed on a placement plane, air is fed from the air feed port of the centrifugal fan in a down direction perpendicular to the placement plane, and
the air outlet is disposed below the air feed port.

5. The charger according to claim 1 , wherein in the direction of the rotation axis, the width between the inner wall and the centrifugal fan is less than or equal to 50% of a diameter of a blade unit of the centrifugal fan.

6. The charger according to claim 1 , further comprising a rib extending from the inner surface of the casing such that the rib is disposed adjacent to the air outlet,
wherein the centrifugal fan is supported by the rib such that the centrifugal fan is separated from the inner surface of the casing.

7. The charger according to claim 6 , wherein the rib is disposed at a peripheral portion of the air feed port of the centrifugal fan.

8. The charger according to claim 1 , wherein
a recess is defined in an outer surface of the casing, and
the air outlet is disposed in the recess.

9. The charger according to claim 1 , wherein
the centrifugal fan comprises:
a fan casing including the air feed port; and
a blade rotatably supported within the fan casing,

in the direction of the rotation axis of the centrifugal fan,
the width between the inner wall and the centrifugal fan is equal to a width between the inner wall and the fan casing, and
the width of the centrifugal fan is equal to a width of the fan casing.

Assignees

• Makita Corp

Inventors

• Mizutani Shinya
• Murakami Junichi

Classifications

• H02J7/70

  characterised by the mechanical construction · CPC title

• H02J7/751

  concerning the insertion or the connection of the batteries · CPC title

• H02J7/50 Primary

  acting upon multiple batteries simultaneously or sequentially · CPC title

• H05K7/20172

  Fan mounting or fan specifications · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title