Patent ID: 8721297
Filing Date: 2014-05-13
Classification: C02F,F04F

Abstract:
1. A multistage pulsating airlift pump assembly, comprising: a lift pipe having an open lower end and an open upper end; a lowermost air injector stage disposed within the lift pipe; a plurality of air injector stages disposed within the lift pipe above the lowermost air injector stage; a pressurized gas source providing pressurized gas to each of the air injector stages; a lowermost timer communicating with the lowermost air injector stage; a plurality of higher timers, each said higher timer communicating with a corresponding one of the higher air injector stages, each timer intermittently actuating the respective higher air injector stage in temporal sequence, the higher timer following the lowermost timer in sequence; and a corresponding capacitance sensor disposed above each of the higher air injector stages, the corresponding capacitance sensor communicating with the respective higher timer of the corresponding one of the higher air injector stages.