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Pump control system
| Details |
Inventors: Sanders, David F.; Aspinwall, James R.; Armbruster, Garry A.;
Assignee:
Primary Examiner: Look; Edward K.
Assistant Examiner:
Attorney, Agent or Firm: Oltman and Flynn
This is a digital solid state control system for pumping liquid to regulate the condition of the liquid in a container, such as the liquid level. One pump is turned on when the liquid rises to one level, and another pump is turned on when the liquid rises to a higher level. An alarm is activated if the liquid rises to a still higher level or if a leak occurs in either pump. The control system alternates which pump turns on first in successive operating cycles. If a power failure occurs while both pumps are on, when power is restored only one pump comes on immediately; the other comes on only after a time delay. |
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DETAILED DESCRIPTION The present control system is for the purpose of regulating the liquid level in a tank or other reservoir, as shown schematically at 10 in FIG.
1.
Two pumps A and B are operatively arranged to pump liquid out of the tank under the control of sensors, such as float switches or control contacts or pressure switches, for example.
The lowermost float switch, shown at line 11, is a normally-open switch which is open when the liquid level is below line 11 and closes when the liquid level is at or above line 11.
Switch 11 is binary since it has just two possible states, open and closed.
Its binary state depends upon the liquid level which it senses.
In the claims, switch 11 is referred to as a "first binary sensor".
The function of switch 11, which will be referred to in this description as the "stop" switch, is to keep both pumps A and B off as long as the liquid level is below line 11 and to enable the pumps to be on when the liquid level is at or above line 11, as explained in detail hereinafter.
The next higher switch, at line 12, is a normally-open switch which is open as long as the liquid level is below line 12 and is closed when the liquid level is at or above line 12.
In the claims, switch 12 is referred to as a "second binary sensor".
The function of switch 12, which will be referred to in this description as the "start first pump" switch, is to turn on the first pump A or B in response to the liquid level's rising to or past line 12.
A still higher switch, shown at line 13, is a normally-open switch which is open as long as the liquid level is below line 13 and is closed when the liquid level is at or above this line.
In the claims, switch 13 is referred to as a "third binary sensor".
The function of switch 13, which will be referred to in this description as the "start second pump" switch, is to turn on the other pump (the one which was not turned on by switch 12) in response to the liquid level's rising to or above line 13.
The highest switch, at line 14, is a normally-open switch which closes when the liquid level rises above this line and triggers an audible or visual alarm, or both, to signal that the liquid level in the tank 10 is excessively high
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