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).

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation of international patent application no. PCT / EP2006 / 011966, filed Dec. 13, 2006, designating the United States of America, and published in German on Jun. 21, 2007 as WO 2007 / 068455, the entire disclosure of which is incorporated herein by reference. Priority is claimed based on Federal Republic of Germany patent application no. DE 10 2005 060 556.7, filed Dec. 17, 2005.BACKGROUND OF THE INVENTION[0002]The present invention relates to a waste water lifting system comprising a collecting tank for liquids, in particular sewage, excrement or the like, and comprising a device for emptying the tank, in particular a pump which is connected to a motor and which is arranged as a motor pump unit wholly or partially lowered in the tank, the tank has at least one inlet and outlet pipe, respectively, for the liquids, and the waste water lifting system is provided with a device for switching the pump as a function of ...

AI Technical Summary

Benefits of technology

[0006]Against this background, it is an object of the present invention to provide a level registration system by which the fill level in the tank can be reliably registered without difficulty.

[0007]A further object of the invention is to provide a level registrations system which does not require use of complex, additional protective devices exposed to the liquid.

[0010]With this arrangement, the problem of fill level sensors becoming contaminated is avoided. Since the sensors which register the degree of deformation of a tank floor part are fitted on the outer side of the tank, they are fully removed from the harmful influences of the waste water. As a result of the arrangement of the tank floor part at a distance from an installation area for the waste water lifting system, a cavity is formed therebetween. This cavity is simultaneously a protective space for the external sensors against external mechanical influences and prevents damage to the elastically resilient tank floor part.

[0013]According to another embodiment, one or more sensors are exchangeably fastened. This can be effected by simple snap-fastening or by using clamping connections and simplifies manufacture, while at the same time making a sensor easy to exchange in a possible service.

Problems solved by technology

However, such dynamic pressure systems, which exist in a wide variety of forms, are susceptible to the sewage water, and its constituent parts, present within the tank.

These float switches also, however, are restricted or jeopardized in terms of their function by deposits or solid constituents in the liquid.

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