Self-priming pump

US4256436A · kind A · utility

Assignee

• SIHI GmbH & Co. KG · DE

Inventors

• Peter Fandrey · Glückstadt, DE
• Hermann Muller · Bonn, DE

Key dates

• Filing date: Dec 22, 1978
• Grant date: Mar 17, 1981
• Expiry date: Dec 22, 1998

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F04D9/041
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The invention relates to a self-priming centrifugal pump that consists of at least one fully-loaded pump or turbine stage with a horizontal shaft and one priming or ventilator stage that is fixed to the same shaft outside the main delivery stream, in the form of a lateral channel or liquid ring pump. In certain specific applications there is no flow through the ventilator stage during normal operation of the pump, and for this reason the ventilator stage is not cooled. The ventilator stage is cooled by virtue of the fact that the suction side of this stage is not only connected to the suction area of the fully loaded turbine stage, in which the gases that are to be removed usually collect, but is also connected to the pressure side of the pump, so that during normal operation a stream of liquid that has a cooling action is formed, and this passes by the suction opening of the ventilator stage.