Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2000-01-25
2001-05-29
Ramirez, Nestor (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S058000, C310S047000
Reexamination Certificate
active
06239521
ABSTRACT:
BACKGROUND OF THE PRESENT INVENTION
1. Field of Invention
The present invention relates to motors, and more particularly to a motor cover arrangement which can highly increase the motor's cooling effect, lower the motor's noise and decrease dust pollution of the motor's interior so as to prolong the service life span there of.
2. Description of Related Arts
A motor
1
converts electrical energy to mechanical energy wherein the motor
1
comprises a rotor
3
for transmitting mechanical work, electric circuit terminals
4
for inputting electrical energy, and an induction means
5
for generating magnetic field. As the electrical energy is input through the electric circuit terminals
4
, a magnetic field is generated by the induction means
5
so as to generate magnetic force exerted on the rotor
3
. The rotor
3
will be rotated through the magnetic field by means of the magnetic force and generate mechanical energy.
While the motor
1
converts electrical energy to mechanical energy, it generates heat energy as well. In order to prevent the motor
1
from overheating, the motor further comprises a cooling fan
6
coaxially mounted on a driving shaft
7
outwardly extended from the rotor
3
. The rotor
3
is arranged to drive the cooling fan
6
to be coaxially rotated through the driving shaft
7
so as to suck the air from outside to cool down the heat generated in the motor
1
.
In order to protect the motor, the conventional motor is disposed in a motor protective housing
8
for covering the motor
1
, wherein the motor protective housing
8
comprises a motor shell
8
a
sheltered the motor
1
and a motor cover
8
b
coaxially mounted on a side of the motor shell
8
b
to cover the cooling fan
6
. A plurality of ventilating holes
9
are provided on the end surface of the motor cover
8
b
so that air from outside can be sucked into the motor protective housing
8
by the cooling fan
6
through the ventilating holes
9
to achieve the cooling effect.
However, when the motor
1
is used in such a tough condition such as driving a saw blade of a cutting machine, saw dust will also be sucked into the motor
1
with air through the ventilating holes during operation. The motor
1
may be burned or permanent damage while the saw dust gradually accumulates to the rotor
3
.
SUMMARY OF THE PRESENT INVENTION
A main object of the present invention is to provide a motor cover arrangement which will highly increase the motor's cooling effect to cool down the heat of the motor so as to prolong the service life span thereof
Another object of the present invention is to provide a motor cover arrangement which air inlet is designed to position at an upper portion of the motor cover to sidewardly suck the fresh air into the motor in order to lower the motor's noise and decrease dust pollution of the motor's interior
Another object of the present invention is to provide a motor cover arrangement which increases both the air sucking effect and cooling effect by sidewardly intaking fresh air and discharging hot air.
Another object of the present invention is to provide a motor cover arrangement which is adapted to install to all kinds of motor.
In order to accomplish the above objects, the present invention provides a motor cover arrangement for covering a cooling fan of a motor enclosed in a motor case, wherein the motor cover arrangement comprises:
a cooling fan cover having an open outlet end mounted on a supporting brim of the motor case and an inlet end sheltered around the cooling fan, wherein the inlet end of the cooling fan cover is extended from the motor case to define a fan cavity to dispose the cooling fan therein and an air inlet opening in front of the cooling fan, and that the outlet end of the cooling fan cover defines an air discharge slot between the outlet end and the motor case to communicate with the air inlet opening, so that when the cooling fan is driven to rotate by the motor, the cooling fan sucks in air through the air inlet opening and discharges the air to outside through the air discharge slot; and
an air intake hood comprising a base shell integrally covering the air inlet opening of the cooling fan cover and an air intake shell extended from the base shell to a side portion of the cooling fan cover to provide an air intake window so as to form an air intake passage between the air intake window positioned at the side portion of the cooling fan cover and the air inlet opening of the cooling fan cover.
Thereby, fresh air can be sucked by the rotating cooling fan from outside via the air intake window, the air intake passage and the air inlet opening to cool down the motor and be discharged through the air discharge slot.
REFERENCES:
patent: 5315193 (1994-05-01), Kummer et al.
patent: 5701045 (1997-12-01), Yokozawa et al.
Chan Raymond Y.
David and Raymond Patent Group
Jones Judson H.
Ramirez Nestor
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