Grundfos International A/s

Grundfos A/s

Preussag Aktiengesellschaft

Jorgen Christensen

Niels D Jensen

Konrad Gries

Hans-Joachim Jordan

The method is provided for operating a pump unit with a centrifugal pump which is driven by an electric motor and which comprises a rotor running in a split tube. The rotor space is separated with respect to the stator in a fluid-tight manner. On running the motor to its operational rotational speed the fluid located in the rotor space due to the increasing rotational speed evaporates and is removed so that the motor finally functions as a dry-runner.

Pump unit and method for operating a pump unit

Method and apparatus for taking samples from a groundwater monitoring

An immersion pump assembly comprises a pump and a wet-rotor motor driving the pump. The motor and the pump have a common shaft which is closable and hollow and which is partly filled with a fluid, for dispersal of waste heat from the rotor chamber of the motor into a heat sink provided by the liquid to be conveyed by means of the pump. The shaft together with the fluid constitutes a rotating heat pipe system.

Immersion pump assembly

The invention relates to a static frequency converter in a housing, especially a frequency converter controlling and/or adjusting the performance data of an electromotor. The housing is shaped as a pressure-resistant casing sealed toward the ambient and at least partially provided with a filler serving as a heat conductor for the dissipation of heat to the surface of the casing.

Growing community of inventors

Bjerringbro, Denmark

Jorgen Christensen