Rotary piston pump with slip ring seals for improved fitting and synchronization of rotary pistons

US9617995B2 · kind B2 · utility

Assignee

• NETZSCH Pumpen & Systeme GmbH · DE

Inventors

• Stefan Weigl · Mühldorf a. Inn, DE
• Reinhard Denk · Dahme/Mark, DE
• Hisham Kamal · Waldkraiburg, DE
• Josef Strassl · Straubing, DE
• Robert Kurz · Aschheim, DE
• Bernhard Murrenhoff · Buchbach, DE
• Thomas Boehme · Waldkraiburg, DE
• Gunther Herr · Haarth, DE
• Franz Kneidl · Waldkraiburg, DE
• Mikael Tekneyan · Waldkraiburg, DE
• Matthias Gradl · Seßlach, DE
• Erwin Weber · Ampfing, DE
• Roger Willis · Mühldorf a. Inn, DE
• Stefan Kern · Frankfurt am Main, DE
• Johann Kreidl · Waldkraiburg, DE
• Marcel Verhoeven · Zedelgem, BE
• Thomas Schmitt · Wauwatosa, US

Key dates

• Filing date: Aug 6, 2014
• Grant date: Apr 11, 2017
• Expiry date: Dec 16, 2034

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16J15/36
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A rotary piston pump with at least two double- or multi-lobe rotary pistons rotating in opposite directions, the drive shafts whereof include seals, wherein the seals are constituted as slip ring seals or lip seals or stuffing-box seals, which in each case are disposed on the shaft shoulder belonging to the respective rotary piston, and one slip ring per seal is provided with a locking device, which includes a large number of fixing positions. The seals are pushed onto a tubular shoulder of the rotary piston, the rotary piston is introduced into the pump housing, the securing element is connected to the slip ring seal in a form-fit manner by rotation of the rotary piston and the shaft shoulder is then rigidly connected to the drive shaft.