Energy recovery device

US5865028A · kind A · utility

Assignee

• HYDAC TECHNOLOGY GMBH · DE

Inventors

• Bernd Klauk · Sulzbach/Saar, DE
• Josef Scholl · Tholey, DE
• Herbert Baltes · Losheim, DE

Key dates

• Filing date: Apr 21, 1997
• Grant date: Feb 2, 1999
• Expiry date: Apr 21, 2017

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P70/10
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

An energy recovery device, in particular of static and kinetic energy, has at least one hydraulically controlled working cylinder (110) or a hydraulic engine (210) that moves tools back and forth, preferably up and down. The working cylinder (110) or the hydraulic engine (210) can be connected to a hydraulic circuit (132) with a pump (134) and to a hydraulic accumulator (138) by a connection line (136). The connection line (136) contains two hydraulically controlled check valves (140, 142) controlled by a control unit, in particular a distributing valve (144), depending on the displacement of the tools or on the state of motion of the working unit. This energy recovery device does not have the disadvantages due to the use of conventional cartridge valves, and is cheap and reliable to operate.