Housing for fan units, and electrical apparatus using a fan unit
AssigneeNidec Corporation
InventorsFumihiro Umeda, Shinji Takemoto
Life of this patent
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Abstract
A housing for a fan unit has a opening defined by an inner peripheral wall being formed with an expanded section for enlarging a part of the opening so that the speed of the air flowing from a predetermined direction and into the opening is higher than the speed of the air flowing from other directions. Since a part of the opening is enlarged, the flowing resistance of the airflow at the portion provided with the expanded section is low as compared with that at other portions. Therefore, the airflow speed increases for the air flowing from a predetermined direction in the electrical apparatus toward the air inlet of the fan unit, and a larger volume of air is thereby drawn into the air passage and is efficiently exhausted.
Claims19
A housing for a fan unit including a fan motor, the housing comprising:
- a fan housing forming an approximately cylindrical passage for receiving the fan motor and guiding airflow induced by the fan motor from one opening to another opening of the passage;
- and
- wherein at least one of said openings defines an expanded portion expanded radially outwardly from the cylindrical passage and angularly through an arc of at least about 60° such that the speed of air flowing from a predetermined direction into the passage is higher than the speed of air flowing into the passage from the other directions.
A housing for a fan unit including a fan motor, the housing comprising:
- a fan housing forming an approximately cylindrical passage for receiving the fan motor and guiding airflow induced by the fan motor from one opening to another opening of the passage;
- and
- wherein a portion of the fan housing forming a peripheral portion of at least one of said openings extends outwardly in the radial direction with respect to a rotational axis of the fan motor, the housing includes at least one rectangular flange extending outwardly in the radial direction with respect to the rotational axis of the fan motor, and said portion extends radially outwardly beyond the peripheral edge of the rectangular flange such that the speed of air flowing from a predetermined direction into the passage is higher than the speed of air flowing into the passage from other directions.
A housing for a fan unit including a fan motor, the housing comprising:
- an inner peripheral wall forming an approximately cylindrical air passage with the fan motor disposed therein for guiding airflow induced by the fan motor through the fan unit, wherein the inner peripheral wall defines an opening forming an inlet at one end for introducing air into the cylindrical passage, and another opening forming an outlet at the opposite end of the cylindrical passage for exhausting air therefrom;
- and
- an expanded section defining a portion of one of said openings at one end of the cylindrical passage that is expanded relative to the other portions of said opening, wherein the expanded section extends radially outwardly with respect to the axis of the fan motor and extends angularly along only a portion of the periphery of said opening defined by an arc of at least about 60° for enlarging said opening in the radial direction and causing the speed of air flowing through the expanded section to be greater than the speed of the air flowing through the remainder of said opening.
An electrical apparatus comprising:
- a casing defining an interior portion, and an opening between the interior portion and exterior of the casing;
- at least one electronic circuit disposed within the interior of the casing;
- a fan unit mounted on the casing for exhausting air from the interior of the casing, through the opening, and to the exterior of the casing;
- and
- means for causing the speed of the airflow from a predetermined direction within the interior of the casing through the opening to be higher than the speed of air flowing through said opening from other directions within the interior of the casing.
Dependencies are inferred from the claim text.