Pumping unit

US8356969B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Benjin Luo · Stuttgart, DE
• Joerg Sigrist · Ludwigsburg, DE
• Andreas Gutscher · Markgröningen, DE

Key dates

• Filing date: Sep 17, 2007
• Grant date: Jan 22, 2013
• Expiry date: Jul 17, 2029

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F05B2250/503
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

Pumping units are known to have an inlet channel, opening out into a pumping channel and tapering from an inlet cross section to an outlet into the pumping channel with an outlet cross-section. The flow is deflected through ninety degrees on entry to the pumping channel which induces strong swirling. The transition from the inlet channel into the pumping channel is not optimal for flow. This effect reduces the efficiency of the pumping unit. The inlet flow into the pumping channel is improved in the pumping unit according to the invention and hence efficiency is improved. According to the invention, the outlet is essentially provided in a first quadrant with relation to the inlet cross section and the tapering of the inlet channel essentially occurs in the other three quadrants. The tapering wall of the inlet channel is formed by a plane-generating shape which goes around from one side of the outlet to the other side of the outlet and is shaped to be increasingly flat relative to a plane of the outlet.