Pumps – Condition responsive control of pump drive motor – Responsive to pump or pump fluid temperature
Reexamination Certificate
2001-06-26
2003-01-07
Freay, Charles G. (Department: 3746)
Pumps
Condition responsive control of pump drive motor
Responsive to pump or pump fluid temperature
C417S366000, C277S359000, C277S930000, C415S176000
Reexamination Certificate
active
06503061
ABSTRACT:
BACKGROUND OR THE INVENTION
The present invention relates to a device for dissipating heat and cutting off power of a pump, which can resist relatively high temperature, and automatically cut off the power of the pump when the pump has been racing to cause the temperature of the pump to rise beyond a certain amount due to lack of water.
Referring to
FIG. 5
, a conventional pump
3
has a motor
31
, a shaft center
311
, a main shaft
33
, a fixing member
32
, a protecting member
34
, a ceramics ring
341
, a rear sealing cover
35
, a shaft seal
361
, a main blade wheel
36
, an O-shaped ring
381
, a middle cover
37
, a single phase valve
371
and a main body
38
.
The shaft center
311
sticks out on the center of the front end of the motor
31
for passing on movement to the main shaft
33
, which is connected to the shaft center
311
. The fixing member
32
is stationary. The motor
31
is fixedly connected to one side of the fixing member
32
from the front end.
The protecting member
34
and the rear sealing cover
35
are fixedly connected to the fixing member
32
. The main blade wheel
36
is disposed next to the front side of the rear sealing cover
35
. The shaft seal
361
is passed through the rear sealing cover
35
, the protecting member
34
and the main blade wheel
36
. The main shaft
33
is passed through the sealing cover
361
to connect the main blade wheel
36
by means of a screw
362
so that the main blade wheel
36
can turn together with the main shaft
33
when the motor is running. The middle cover
37
and the single phase valve
371
are disposed next to the main blade wheel
36
in the main body
38
, which is connected to the rear sealing cover
35
with the O-shaped ring
381
being disposed in between for sealing up the joint therebetween.
The shaft seal
361
is tightly passed into the protecting member, and will not turn together with the main blade wheel
36
so water will not flow to the motor
31
when the main blade wheel
36
turns to pump water. The protecting member
34
is made of soft plastic materials so that same and the ceramics ring
341
passed into the protecting member
34
have watertight connection. The shaft sealing cover
361
is tightly passed into the protecting covering
34
as above mentioned, and further tightly passed into the ceramics rings
341
from the front end portion so that water won't flow through the joints to the motor
31
to damage the same.
The motor
31
will cause high temperature in running and the large amount of heat will pass through the shaft seal
361
and the main blade wheel
36
, and is dissipated by water pumped into the pump. The ceramics ring
341
is disposed between the protecting member
34
and the front end portion of the shaft seal
361
mainly because it has relatively good conductivity and heat resisting ability to dissipate heat for preventing the plastic protecting member
34
from being melted by the large amount of heat.
However, the conventional pump with the heat dissipating ceramics ring still has drawbacks as follows:
1. The motor will race due to lack of water, and produce a large amount of heat, which can not be dissipated because there is no enough flowing water in contact with the main blade wheel. Consequently the large amount of heat will pass through the plastic protecting member and the rear sealing cover to damage same.
2. When the plastic protecting member is melted, water will flow through apertures between same and the shaft seal to the motor, and cause the motor to get damaged.
3. The motor will also be damaged by the high temperature caused by the racing thereof due to lack of water.
SUMMARY OF THE INVENTION
Therefore, it is a main object of the present invention to provide a device to a pump that can dissipate heat and cut off power automatically when the motor of the pump has been racing to cause a high temperature due to lack of water.
The device for dissipating heat and cutting off power of a pump in the present invention includes a heat dissipating ceramics ring and a power cutting-off member.
The ceramics ring is tightly fitted in a pivoted hole of a plastic member. The pump has a motor with a shaft passing through a shaft seal to connect a main blade wheel provided for pumping water. The shaft seal is fitted in the ring from a front end portion, and fitted in the plastic member to form a watertight connection. The ceramics ring has an annular trench forming between an outer and an inner annular portions for increasing contact area of both of the annular portions with water so that the ring can dissipate heat more rapidly. Thus, the plastic member is protected from getting melted by heat from the motor.
The power cutting off device is connected to the motor, and has a sensing element disposed in contact with the ceramics ring to sense a temperature of same for activation of the power cutting-off member when a racing of the motor occurs to cause temperatures of both the motor and the ceramics ring rising.
REFERENCES:
patent: 4746269 (1988-05-01), Raab
patent: 4776759 (1988-10-01), Maskell et al.
patent: 5293929 (1994-03-01), Smith
patent: 6325377 (2001-12-01), Williamson et al.
Freay Charles G.
Liu Han L.
Rosenberg , Klein & Lee
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