Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2003-10-10
2004-09-28
Le, Dang (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S062000, C310S063000, C310S089000, C310S058000, C310S06000A, C310S052000
Reexamination Certificate
active
06798098
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a ceiling fan, and more particularly to a heat-radiating structure for ceiling fan's motor housing.
2. Description of the Prior Arts
With reference to
FIGS. 1 and 2
, a conventional motor housing for ceiling fan includes an upper cover
10
and a lower cover
20
. The upper cover
10
is provided with plural air strip holes
11
, and to the lower surface of the upper cover
10
a fan
12
is mounted. The lower cover
20
includes a base portion
21
and a rotor portion
22
, on the base portion
21
is provided with plural air strip holes
211
, whereas about the peripheries of the upper and the lower surfaces of the rotor portion
22
are equidistantly provided with plural spacers
221
so as to form ventilation orifices
222
. Furthermore, on the internal sidewall of the rotor portion
22
is annularly defined with magnetic inductive portion
223
. In the motor housing that formed by the upper and the lower covers
10
,
20
is defined with a stator
30
. The stator
30
includes an electromagnet portion
31
wound with coils. During rotation of the ceiling fan, a great amount of heat is produced both by the electromagnet portion
31
of the stator
30
and the magnetic inductive portion
223
of the lower cover
20
, at the moment, with the rotation of fan
12
of the upper cover
10
, air inside the upper portion of the housing will be expelled out through the ventilation orifices
222
of the lower cover
20
, so as to create suction pressure inside the upper portion of the housing, meanwhile air under the housing enters the housing via the air strip holes
211
of the lower cover
20
so as to produce convection current. By this way, the housing can be cooled down. However, there are still some disadvantages of this heating-radiating structure need to improved as follows:
First, since the inner space of the housing is not big, the fan
12
installed on the lower surface of the upper cover
10
should be small in size in order to be received in the housing, the convection effect caused by the fan
12
will be relatively poor, and as a result, the effect of heat-radiating of the motor housing is poor. Furthermore, the fan
12
is not easy to be assembled in the motor housing and thus the production cost is relatively increased.
Second, the upper and the lower covers
10
,
20
are provided with no flow guiding structure, during rotation, the motor housing is not able to suck outside air in and expel it out by itself. The effect of heat-radiating will be poor due to only the fan
12
is employed to expel air.
The present invention has arisen to mitigate and/or obviate the afore-described disadvantages of the conventional heat-radiating structure for ceiling fan's motor housing.
SUMMARY OF THE INVENTION
The primary object of the present invention is to provide a heat-radiating structure for ceiling fan's motor housing wherein on the upper and the lower surfaces of a the motor housing is provided with arched ears, and on the periphery of the motor housing is defined with inclined flow deflectors, with these structures, the ceiling fan's motor housing itself is possess with an ability of heat-radiating.
The present invention will become more obvious from the following description when taken in connection with the accompanying drawings, which shows, for purpose of illustrations only, the preferred embodiment in accordance with the present invention.
REFERENCES:
patent: 5883449 (1999-03-01), Mehta et al.
patent: 6400051 (2002-06-01), Hsieh
patent: 6744157 (2004-06-01), Choi
Baxley Charles E.
Le Dang
Mohandesi Iraj A.
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