ELECTRIC FAN
First Claim
Patent Images
1. An electric fan comprising:
- a fan housing made of an insulating resin and including an air channel having a suction port and a discharge port;
a bearing holder fixed to the fan housing;
at least one ball bearing that is made of a metal and is held by the bearing holder;
a motor including a stator and a rotary shaft made of a metal and supported by the at least one ball bearing;
an impeller fixed on the rotary shaft to rotate in the air channel; and
an electromagnetic noise guard made of a metal and disposed in or over the suction port or the discharge port of the air channel, whereinthe electromagnetic noise guard is electrically connected to an outer race of the at least one ball bearing and electrically grounded.
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Accused Products
Abstract
A fan casing, webs, and a motor casing are integrally formed of a resin material by injection molding to configure a fan housing. An electrically grounded electromagnetic noise guard and a bearing holder to which an outer race of a ball bearing are electrically connected by an electrically-conducting path member provided in the fan casing by means of insert molding. Thus, the ball bearing may sufficiently be prevented from suffering electric corrosion in an electric fan of which a fan housing is made of an insulating resin.
23 Citations
10 Claims
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1. An electric fan comprising:
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a fan housing made of an insulating resin and including an air channel having a suction port and a discharge port; a bearing holder fixed to the fan housing; at least one ball bearing that is made of a metal and is held by the bearing holder; a motor including a stator and a rotary shaft made of a metal and supported by the at least one ball bearing; an impeller fixed on the rotary shaft to rotate in the air channel; and an electromagnetic noise guard made of a metal and disposed in or over the suction port or the discharge port of the air channel, wherein the electromagnetic noise guard is electrically connected to an outer race of the at least one ball bearing and electrically grounded. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification