Apparatus for heating and drying articles

US4424633A · kind A · utility

Assignee

• Arthur Pfeiffer Vakummtechnik Wetzlar GmbH · US

Inventors

• Karl-Heinz Bernhardt · Solms, DE
• Helmut Strzala · Solms, DE

Key dates

• Filing date: Oct 9, 1981
• Grant date: Jan 10, 1984
• Expiry date: Oct 9, 2001

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F26B21/145
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Apparatus for heating and drying articles including an evacuable drying chamber for heating therein articles by condensation heat of the vapor of a first liquid supplied to the drying chamber, a vacuum pump for evacuating the boiler, a first vapor condenser and a second vapor condenser connected betwen the drying chamber and the vacuum pump, a thin film evaporator for receiving condensate from the drying chamber in the form of the first liquid and a second liquid having a higher boiling point than the first liquid, the second liquid being obtained from the articles within the drying chamber, a condensate collecting container for receiving from the evaporator liquid condensate which is not evaporated in the evaporator, a pressure barrier arranged between the evaporator and the collecting container and a re-evaporator arranged between the pressure barrier and the collecting container. The re-evaporator operates to lower the residual concentration of the first liquid and it is connected to the second vapor condenser thereby to reduce the residual concentration of the first liquid to a value corresponding to the vapor pressure in the second vapor condenser.