Charger

Patent metadata

Field	Value
Publication number	US-2018317348-A1
Application number	US-201615770395-A
Country	US
Kind code	A1
Filing date	Jun 29, 2016
Priority date	Oct 28, 2015
Publication date	Nov 1, 2018
Grant date	—

Abstract

A charger is provided with an intake hole through which outside air may flow into the interior of and through the body of the charger, and an exhaust hole from which the outside air is discharged through by the driving a cooling fan. A first vertical wall that surrounds the intake hole or a region exposed to water that drops down the intake hole in a fence-shaped manner, and a second vertical wall that surrounds the exhaust hole or a region exposed to water that drops down the exhaust hole in a fence-shaped manner are provided on a bottom plate of the housing. An electrical circuit board is disposed outward of an area where the first vertical wall surrounds the intake hole and also disposed outward of an area where the second vertical wall surrounds the region exposed to water that drops down the exhaust hole etc.

First claim

1 . A charger, comprising:
an electrical circuit board; a cooling fan; a housing in which the electrical circuit board and the cooling fan are housed; an intake hole and an exhaust hole that are provided in the housing, where outside air is taken from the intake hole and cools the interior of the housing and then is discharged from the exhaust hole when the cooling fan is driven; a first vertical wall that is provided on a bottom plate of the housing, where the first vertical wall surrounds the intake hole or a region exposed to water that drops down the intake hole in a fence-shaped manner; and a second vertical wall that is provided on a bottom plate of the housing, where the second vertical wall surrounds the exhaust hole or a region exposed to water that drops down the exhaust hole in the fence-shaped manner are, wherein, the electrical circuit board is disposed outward of an area where the first vertical wall surrounds the intake hole or the region exposed to water that drops down the intake hole, further wherein the electrical circuit board is disposed outward of an area where the second vertical wall surrounds the exhaust hole or the region exposed to water that drops down the exhaust hole.

2 . The charger according to claim 1 , wherein:
the intake hole is formed on a lower portion of the housing and surrounded by the first vertical wall; and the exhaust hole is formed on the lower portion of the housing and surrounded by the second vertical wall.

3 . The charger according to claim 1 , further comprising,
a third vertical wall that is formed on a upper portion of the housing, wherein: in a case where a lower end of the intake hole is higher than an upper end of the first vertical wall in the up-to-down direction, the intake hole is configured to be surrounded by the third vertical wall such that water that enters from the intake hole drops down along the third vertical wall to a region surrounded by the first vertical wall; and in a case where a lower end of the exhaust hole is higher than an upper end of the second vertical wall in the up-to-down direction, the exhaust hole is configured to be surrounded by the third vertical wall such that water that enters from the exhaust hole drops down along the third vertical wall to a region surrounded by the second vertical wall.

4 . The charger according to claim 3 , wherein:
the intake hole is formed on a lower portion of the housing and surrounded by the first vertical wall; the exhaust hole is formed on an upper portion of the housing and surrounded by the third vertical wall; and a region exposed to water that drops down the exhaust hole along the third vertical wall is surround by the second vertical wall.

5 . The charger according to claim 3 , wherein:
the intake hole is formed on an upper portion of the housing and surrounded by the third vertical wall; the exhaust hole is formed on a lower portion of the housing and surrounded by the second vertical wall; and a region exposed to water that drops down the exhaust hole along the third vertical wall is surround by the first vertical wall.

6 . The charger according to claim 1 , wherein:
the electrical circuit board is disposed above the bottom plate of the housing along the bottom plate of the housing; in a case where the intake hole is formed on the lower portion of the housing, the upper end of the intake hole is positioned so as to be lower than the upper end of the first vertical wall in the up-do-down direction; and in a case where the exhaust hole is formed on the lower portion of the housing, the upper end of the exhaust hole is positioned so as to be lower than the upper end of the second vertical wall in the up-do-down direction.

7 . The charger according to claim 1 , wherein,
the intake hole is formed on one end side of the housing as seen in a plan view and the exhaust hole is formed on the other end side of the housing as seen in the plan view.

8 . The charger according to claim 1 , further comprising,
a drain hole that is formed on the bottom part of the housing in a region surrounded by the first vertical wall or the second vertical wall, where the region is configured to receive water that drops down the intake hole or the exhaust hole.

9 . The charger according to claim 1 , wherein:
the cooling fan is disposed in the vicinity of the first vertical wall or the second vertical wall such that an axis about which the cooling fan rotates is approximately horizontal; and an intake side of the cooling fan is directed to the intake hole, as seen in a plan view.

10 . The charger according to claim 9 , wherein,
the cooling fan is disposed such that a lower end of the cooling fan is retained approximately as high as or below the electrical circuit board.

11 . The charger according to claim 3 , further comprising,
a guide wall that is formed outward of a region surrounded by the third vertical wall, wherein: the third vertical wall that surrounds the intake hole or the exhaust hole is formed on a ceiling portion of the housing; and the guide wall is configured to guide airflow between a region surrounded by the third vertical wall and the ceiling portion of the housing.

12 . The charger according to claim 3 , wherein:
the third vertical wall that surrounds the intake hole or the exhaust hole is formed on a ceiling portion of the housing; and a protruding length of the third vertical wall is configured such that an protruding end of the third vertical wall below the ceiling portion of the housing is lower than a lower end of the respective intake hole or the exhaust hole that the third vertical wall surrounds in the up-to-down direction.

13 . The charger according to claim 6 , wherein the electrical circuit board is parallel to and vertically spaced apart from the bottom plate of the housing.

14 . A charger, comprising:
an electrical circuit board; a cooling fan; a housing in which the electrical circuit board and the cooling fan are housed; an intake hole and an exhaust hole which are provided within the housing, where outside air may flow into the interior of and through the body of said charger when the cooling fan is driven, wherein the driving of said cooling fan further drives said cooled air towards the exhaust hole after cooling the electrical circuit board and associated electrical components which include a transformer and a diode as well as FETs, whereby said associated components are all mounted on said electrical circuit board, whereby said air subsequent to cooling the electrical components may be discharged through the exhaust hole; a first vertical wall that is configured to surround the intake hole or a region exposed to water that drops down the intake hole, in the fence-shaped manner on the front, rear, and left or right sides; and a second vertical wall that is configured to surround the exhaust hole or a region exposed to water that drops down the exhaust hole, in the fence-shaped manner on the front, rear, and right or left sides, where the left and right sides of the exhaust hole are opposite to that of the intake hole, wherein both the first and second vertical walls are provided projecting upwards for a predetermined length from a bottom plate of the housing, wherein the electrical circuit board is disposed in the housing outward of an area where the first vertical wall surrounds the intake hole or the region exposed to water that drops down the intake hole, further wherein the electrical circuit board is disposed outward of an area where the second vertical wall surrounds the exhaust hole or the region exposed to water that drops down the

Assignees

• Makita Corp

Inventors

• Taga Hideyuki

Classifications

• H02J7/70 Primary

  characterised by the mechanical construction · CPC title

• H05K7/20181

  Filters; Louvers · CPC title

• H05K7/20

  Modifications to facilitate cooling, ventilating, or heating · CPC title

• H05K7/20172

  Fan mounting or fan specifications · CPC title

• H05K7/20145

  Means for directing air flow, e.g. ducts, deflectors, plenum or guides · CPC title