Rotary piston blower having offset shafts and a tapered housing to compensate for thermal deformation

US4758140A · kind A · utility

Assignee

• Wankel GmbH · DE

Inventors

• Wilhelm Durach · Gettorf, DE
• Wolfgang Sohler · Schallstadt, DE
• Werner Schubert · Wiesloch, DE

Key dates

• Filing date: Jun 19, 1987
• Grant date: Jul 19, 1988
• Expiry date: Jun 19, 2007

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F04C18/126
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

An external axial rotary piston blower having a housing including a casing part and two side parts of which the casing part encompasses a cylindrical runway surfacing which is formed by two cylinders intersecting each other in a region of an inlet and an outlet and in which two identical pistons having at least one wing portion rotate among each other, such pistons having starting surfaces with a large radius running against a casing runway surfacing and respectively another piston having a starting surface with a small radius running correspondingly against a casing runway surfacing. Shafts of the pistons are offset or shifted in cold condition in a direction of a short housing axis toward the outlet and the housing on the side of the outlet is shorter in axial direction in cold condition than on the side of the inlet.