Centrifugal pump for the delivery of hot liquids

US4979875A · kind A · utility

Assignee

• SIHI GmbH & Co. KG · DE

Inventors

• Hermann Muller · Bonn, DE
• Wilfried Lehmann · Heiligenstedten, DE
• Ralf Mann · Huje, DE

Key dates

• Filing date: Apr 14, 1989
• Grant date: Dec 25, 1990
• Expiry date: Apr 14, 2009

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16J15/3404
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

Centrifugal pump for the delivery of hot media, in particular of hot water with at least one shaft passage through the pump housing (1,2) to the outside, which passage is provided with a mechanical seal (5). The sealing space is separated from the pump housing by a spacer zone (8) with close shaft play. For the avoidance of sealing disturbances by accumulated gas, the sealing space contains first means (12, 20, 21) for the generation of a liquid circulation in the sealing space with intensive impingement of the sliding surface area of the mechanical seal, second means (12, 18,21) for the stabilization of the liquid circulation away from the mechanical seal and thirdly a large-volume, flow-stabilized, ventable receiving space for separated gas. The gas fractions are thereby reliably isolated from the mechanical seal, separated from the liquid circulation and accumulate in the upper region of the sealing space, so that they are extracted from the liquid circulation and can be drawn off.