Waste Water Lifting System

Abstract

A waste water lifting system with a collecting tank ( 2 ) for liquids, in particular waste water, fecal matter, or the like, and with a device for emptying the tank, in particular a pump ( 3 ) which is connected to a motor and is arranged as a motor and pump unit in an entirely or partially recessed manner in the tank ( 2 ). The tank ( 2 ) has at least one inlet and outlet pipe ( 4, 5 ) for the liquids, and the waste water lifting system is provided with a device for switching the pump ( 2 ) on and off as a function of the liquid level (PA, PE, A) within the tank ( 2 ). The tank floor ( 12 ) or at least a partial surface thereof ( 12.1, 12.2 ) is constructed to be elastically flexible as a function of the filling level of the tank. One or more sensors ( 15 ) are arranged on the outside ( 14 ) of the elastically flexible tank floor surface ( 12.1, 12.2 ) and measure the deformation thereof. The elastically flexible tank floor part ( 12.1, 12.2 ) is arranged at a distance from an installation surface ( 13 ).

1 . A waste water lifting system comprising:
 a collecting tank for a liquid, said tank having at least one inlet and an outlet for the liquid;   a device for emptying the tank; and   a device for switching the tank emptying device on or off as a function of a liquid level within the tank;   wherein
 said tank comprises at least a partial area which is elastically resiliently deformable as a function of the liquid level in said tank; and 
 at least one sensor is disposed on the outside of the tank for measuring deformation of the deformable tank area, said at least one sensor being operatively connected to the switching device for transmitting a measured deformation of the deformable tank area to the switching device as an indication of the liquid level in said tank. 
   
   
   
       2 . A system as claimed in  claim 1 , wherein said liquid is sewage. 
   
   
       3 . A system as claimed in  claim 1 , wherein said device for emptying the tank comprises a pump and motor unit. 
   
   
       4 . A system as claimed in  claim 3 , wherein said pump and motor unit is disposed at least partially within the tank. 
   
   
       5 . A system as claimed in  claim 4 , wherein said pump and motor unit is disposed entirely within said tank. 
   
   
       6 . A system as claimed in  claim 1 , wherein said deformable tank area is a partial area of the tank floor. 
   
   
       7 . A system as claimed in  claim 6 , wherein said tank is disposed on an installation area, and the deformable tank floor area is spaced a distance from said installation area. 
   
   
       8 . A system as claimed in  claim 6 , wherein said at least one sensor is disposed at a tank floor measuring point at which an evaluable deformation occurs when the tank is maximally filled. 
   
   
       9 . A system as claimed in  claim 6 , wherein said at least one sensor is disposed at a tank floor measuring point at which an evaluable deformation occurs when the tank is minimally filled. 
   
   
       10 . A system as claimed in  claim 6 , wherein an elastically resilient element is arranged in the tank floor in a leaktight and flexibly held manner and is connected to said at least one sensor. 
   
   
       11 . A system as claimed in  claim 1 , wherein said at least one sensor is releasably secured to the outside of the tank, whereby said at least one sensor can be exchanged for another sensor.