Method to control out pumping from a sewage pump station
AssigneeITT Flygt AB
InventorAnders Morin
Life of this patent
Estimating the term…
Abstract
A method to control stops of an intermittently operating electric motor that drives a submersible pump arranged in a pump station for sewage water, wherein starts and stops of the motor depend on the water level in the pump station or on any other electric parameter possible to measure, and where a stop of the motor is initiated when the water level has gone down to the upper part of the motor. The method involves the steps of selecting intervals for pumping down to a level below that of the upper part of the motor where the pump starts sucking air, and pumping down to the lower level at each of the selected intervals until the pump starts sucking air.
Claims14
A method to control stops of an intermittently operating electric motor that drives a submersible pump arranged in a pump station, the pump being operative for pumping sewage water, starts and stops of the motor being dependent on the sewage water level in the pump station, the method comprising the steps of:
- stopping said electric motor at a first level when the sewage water level in the pump station has gone down to an upper part of said pump;
- and
- at preselected intervals, pumping below said first level and stopping said electric motor when the sewage water level in the pump station reaches a water inlet of said pump.
A method for operating an electric motor driven pump which pumps sewage water, said method comprising the steps of:
- automatically starting said pump when sewage water is at a predetermined level above said pump;
- automatically stopping said pump at a first level when the sewage water has gone down to the level of an upper part thereof and ceases to effectively cool said motor of said pump;
- and
- at preselected intervals, pumping below said first level and automatically stopping said pump when the sewage water reaches the level of a water inlet of said pump and said pump ceases to effectively the pump sewage water.
A method for reducing the amount of deposits which form in a tank, the method comprising the steps of:
- providing a plurality of electric motor driven pumps for pumping sewage water from said tank;
- automatically starting each of said pumps when the sewage water in said tank is at a predetermined level above said pumps;
- automatically stopping said pumps at a first level when the sewage water has gone down to the level of an upper part of each of said pumps and ceases to effectively cool said motors of said pumps;
- and
- at preselected intervals, pumping below said first level and automatically stopping said pumps when the sewage water reaches the level of a water inlet of each of said pumps and said pumps cease to effectively the pump sewage water.
Dependencies are inferred from the claim text.