U.S. patent application number 11/619365 was filed with the patent office on 2008-07-03 for protective device for a controlling system of a sewage pump.
Invention is credited to Robert M. Keener.
Application Number | 20080159876 11/619365 |
Document ID | / |
Family ID | 39584233 |
Filed Date | 2008-07-03 |
United States Patent
Application |
20080159876 |
Kind Code |
A1 |
Keener; Robert M. |
July 3, 2008 |
PROTECTIVE DEVICE FOR A CONTROLLING SYSTEM OF A SEWAGE PUMP
Abstract
A protective device for a controlling system of a sewage pump
has a protective circuit to protect a start capacitor and to avoid
the start capacitor from burnout when an overload is occurred by
actuating power source (ON status) or when a transient voltage is
occurred by malfunction of a controlling circuit. Therefore, the
start capacitor is certainly protected and significantly improved
in lifespan.
Inventors: |
Keener; Robert M.; (Ashland,
OH) |
Correspondence
Address: |
KAMRATH & ASSOCIATES P.A.
4825 OLSON MEMORIAL HIGHWAY, SUITE 245
GOLDEN VALLEY
MN
55422
US
|
Family ID: |
39584233 |
Appl. No.: |
11/619365 |
Filed: |
January 3, 2007 |
Current U.S.
Class: |
417/44.11 |
Current CPC
Class: |
H02K 17/30 20130101;
F04D 15/0077 20130101 |
Class at
Publication: |
417/44.11 |
International
Class: |
F04B 49/02 20060101
F04B049/02; F04B 49/06 20060101 F04B049/06 |
Claims
1. A protective device for a controlling system of a sewage pump
with a start capacitor and a run capacitor, the protective device
comprising a protective circuit composed of a centrifugal switch
adapted to mount on an output shaft of the sewage pump and
providing a protective efficiency by cutting power to avoid the
start capacitor in the sewage pump from burnout.
2. The protective device as claimed in claim 1, wherein one end of
the centrifugal switch is adapted to connect to the start capacitor
in series connection; another end of the centrifugal switch is
adapted to connect to the run capacitor in parallel connection;
wherein, the start capacitor and the run capacitor are
operationally and respectively in parallel connection and are
connected to an actuating coil and an operating coil at two ends of
the parallel connection to achieve a combined circuit for the
operation of the sewage pump.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a protective device for a
controlling system of a sewage pump, and more particularly to a
protective device that controls pump operation and has a protective
circuit protecting a start capacitor in the controlling system to
avoid the start capacitor from burnout when an overload is occurred
by actuating power source (ON status) or when a transient voltage
is occurred by malfunction of a controlling circuit.
[0003] 2. Description of Related Art
[0004] A conventional sewage pump system in accordance with the
prior art has an operational controlling circuit system for
controlling the operation of a sewage pump. The operational
controlling circuit system has a start capacitor connected with a
run capacitor in parallel connection and with a switch in series
connection and further connected with an actuating coil and an
operating coil to perform a combined circuit. In the operational
controlling circuit system, the actuating coil and the operating
coil drive the sewage pump to function when the electrical power is
supplied. Because the switch is the essential element to control
the sewage pump to work or to stop, its contact is always changed
between a normal closed (N.C.) status and a normal open (N.O.)
status. Moreover, its contact has carbon-deposition or oxidation
incurred by electric sparkles of large current. Therefore, the
contact can not successfully disengage and is kept at the normal
closed (N.C.) status that makes the start capacitor to electrically
connect the power source. When the start capacitor is kept to be
charged, it will burnout sooner or later.
[0005] According to above description, the conventional sewage pump
system still has some drawbacks in use.
SUMMARY OF THE INVENTION
[0006] A main objective of the present invention is to provide a
protective device for a controlling system of a sewage pump,
wherein the protective device protects a start capacitor from
keeping discharge and burnout when a switch is abnormally suspended
at a normal closed (N.C.) status.
[0007] To achieve the foregoing objective, the protective device
for a controlling system of a sewage pump with a start capacitor
and a run capacitor, the protective device comprising a protective
circuit composed of a centrifugal switch adapted to mount on an
output shaft of the sewage pump and providing a protective
efficiency by cutting power to avoid the start capacitor in the
sewage pump from burnout.
[0008] By having the protective circuit, the start capacitor is
protected from burnout to have extended lifespan.
[0009] Further benefits and advantages of the present invention
will become apparent after a careful reading of the detailed
description with appropriate reference to the accompanying
drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] FIG. 1 is a cross-sectional view of a sewage pump system
with a protective device in accordance with the present invention;
and
[0011] FIG. 2 is a schematic circuit diagram for the sewage pump
system with the protective device in the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0012] A protective device for a controlling system of a sewage
pump in accordance with the present invention has a protective
circuit to protect a start capacitor and to avoid the start
capacitor from burnout when an overload is occurred by actuating
power source (ON status) or when a transient voltage is occurred by
malfunction of a controlling circuit. Therefore, the start
capacitor is certainly protected and significantly improved in
lifespan.
[0013] The protective device for a controlling system of a sewage
pump is applied to an operation-controlling circuit system 2 to
drive a sewage pump 1 as shown in FIG. 1, wherein the
operation-controlling circuit system 2 as shown in FIG. 2 has a
start capacitor 21 and a run capacitor 22 connected in parallel
connection. The start capacitor 21 connects a centrifugal switch 3
in series connection and adapts to connect to an actuating coil 11
and an operating coil 12 of the sewage pump 1 to form a combined
circuit. Specifically, the start capacitor 21 and the run capacitor
22 are operationally and respectively connected to the actuating
coil 11 and the operating coil 12 at two ends of their parallel
connection to achieve the combined circuit for the operation of the
sewage pump. In the operation-controlling circuit system 2, the
actuating coil 11 and the operating coil 12 start to make the
sewage pump operate when the power is supplied. Meanwhile, the
centrifugal switch 3 adapted to mount on a central shaft 4 of the
sewage pump 1 changes its contact from the normal closed (N.C.)
status to the normal open (N.O.) status by the centrifugal force
from rotation of the central shaft 4. Thereby, the start capacitor
21 is electrically isolated from the power source because of the
broken circuit. Then, the start capacitor 21 stops the discharging
movement and the functioning status of charging or discharging to
protect itself from burnout during long-term operation.
[0014] According to above description, the protective device for a
controlling system of a sewage pump has the following advantage
that:
[0015] the centrifugal switch in the protective device is a
mechanical centrifugal switch and changes it contact from the
normal closed (N.C.) status to the normal open (N.O.) status by the
centrifugal force from rotation of the central shaft 4. Thereby,
the start capacitor 21 is electrically isolated from the power
source because of the broken circuit. Then, the start capacitor 21
stops the discharging movement and the functioning status of
charging or discharging to protect itself from burnout during
long-term operation.
[0016] Although this invention has been described in its preferred
form with a certain degree of particularity, it is understood that
the present invention of the preferred form has been made only by
way of example and that numerous changes in the details of
construction and the combination and arrangement of parts any be
resorted to without departing from the spirit and scope of the
invention.
* * * * *