Wet rotor motor pump

Abstract

The invention relates to a wet-rotor motor pump comprising a can which separates the stator from the motor shaft that is mounted in the can and carries rotor laminations, said motor shaft projecting into the pump chamber and carrying, in said pump chamber, the impeller. A coaxial annular space is provided between a separating wall separating the can interior from the pump chamber and the rear of the impeller, the pumped liquid flowing from the annular space into the rotor space surrounded by the can through at least one flow passage in the separating wall, and flowing back to the pump chamber once it has permeated the rotor space, especially through the longitudinal hollow space of the motor shaft. The rear of the impeller has a coaxial annular projection that separates the rear annular space surrounding the motor shaft from the rest of the pump chamber, apart from at least one throttle gap extending through the annular projection. Pumped liquid flows from the pump pressure side into the annular space through the throttle gap in a throttled manner, said annular space being connected to the pump intake side by at least one throttled opening in the rear wall of the impeller and / or in the wall of the hollow shaft of the motor.

Description

technical field [0001] The invention relates to a wet rotor motor pump comprising a gap tube which separates the motor stator from a motor shaft supported in the gap tube which carries the rotor set, which protrudes into the pump chamber and there Support pump impeller. Background technique [0002] A typical heating circulation pump consists of the following main components: a drive motor, a pump casing and an impeller. The motor is usually an electric motor designed for wet operation. The impeller is often a radial impeller and transmits the power of the motor to the medium. In these wet rotary lobe pumps, the rotor of the electric motor is flushed by the medium. The stator is separated from the medium by a gap tube / gap pot. The bearings of the rotor are lubricated by the medium. Such a structure requires no maintenance and has a very long service life if the media is relatively clean. To ensure that a flow through the rotor space takes place, the pressure difference...

AI Technical Summary

Problems solved by technology

A significant disadvantage of these solutions is that the flow through the rotor space changes depending on the operating point of the pump

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