DE10239997A1 - Electromagnetic pump has multiple turbine stages with output of last stage connected to discharge chamber of first stage - Google Patents

Abstract

The electromagnet pump is a multiple stage turbine pump with the motor and the electric components sealed in a water tight capsule. The output of the last stage (LR3) fluid is fed over a return flow channel into the discharge chamber of the first stage (LR1). The return flow opens radially into the discharge chamber. The return flow channel has a non-return flow valve.

Description

The invention relates to a pump arrangement, which is both a submersible pump and a self-priming pump can be used.

From the DE 295 20 422 U1 Such a centrifugal pump is known, for example, with an impeller driven by a watertightly encapsulated motor, in which a venturi nozzle is arranged as an injector at the inlet of the impeller and part of the liquid is returned from the outlet of the impeller via a diffuser and a diffuser unit to the inlet of the injector.

The present invention lies the task of an advantageous pump arrangement of the beginning specified type.

The invention is in the claim 1 described. The dependent Expectations contain advantageous refinements and developments of the invention.

Thanks to the multi-level design the pump with several coaxially arranged impellers a particularly powerful one Pump arrangement, in particular in connection with the essentially radial inflow of about the return flow channel portion of the pumped liquid at the exit of the in the conveying direction last impeller. Advantageously, is in the return flow channel spring loaded check valve inserted.

With the in the figure as a sectional view Outlined pump arrangement is an electric drive motor ME into an engine compartment of the pump housing PG used, from which part of the motor housing, which is also a gear can contain, protrudes into the pressure chamber RD of the pump. The engine compartment, within which the electrical connections of the motor are located Completely sealed watertight against the pressure chamber and the environment. Also sealed is the drive shaft WE, which is arranged coaxially LR1 wheels, LR2, LR3 carries.

The impellers form in a manner known per se a multi-stage pump, the near-axis input of the first stage with impeller LR1 connects to a suction chamber SR and the Output of the last stage with impeller LR3 acts on the pressure chamber RD. Flows from the pressure chamber RD the liquid through an output channel arrangement AK surrounding the engine compartment for the outlet connection AU.

Introduces from pressure room RD Backflow channel RS back to the entrance of the first pump stage and essentially opens there via an outflow channel radially into the area of the suction chamber SR close to the impeller. In the course the return flow channel RS, preferably at a deflection point from essentially to Pump shaft parallel course in the radial course is one Check valve assembly RV provided, which is advantageously a spring with a low Preload is loaded.

about a filler neck FS can the suction chamber with liquid filled become. about an intake pipe that continues to the outside of the suction chamber AN can be liquid flow into the suction chamber, wherein the multi-stage arrangement of the impellers in connection with the return of a liquid portion from the pressure chamber to the entrance of the first pump stage Suction from a greater depth allows. An outlet vacuum of 0.8 bar can easily be generated.

Claims (3)

Pump arrangement with an electric motor driven multi-stage centrifugal pump, its motor and electrical components are encapsulated watertight, and which one from the exit of the last Level liquid over one Backflow channel in the Exit space of the first stage is returned. Arrangement according to claim 1, characterized in that the Return flow channel in Essentially radially flows into the exit space. Arrangement according to claim 1 or 2, characterized in that in the return flow channel spring loaded check valve is arranged.