Refrigerated chamber for obtaining thin slices at low temperature

US5070935A · kind A · utility

Inventors

• Hellmuth Sitte · Laa an der Thaya, AT
• Helmut Hassig · Homburg, DE
• Klaus Neumann · Niederwerrn, DE

Key dates

• Filing date: Apr 14, 1989
• Grant date: Dec 10, 1991
• Expiry date: Apr 14, 2009

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N1/42
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A refrigerated chamber includes, inside a metal wall and a foam insulating layer thereof, a sheet metal tank, in which, depending on levels of filling with liquid nitrogen, various compartments of the tank divided by separations, of different height are filled with LN.sub.2. Thereby, different cooling powers are available for varying temperature ranges between ambient temperature and the temperature of the liquid nitrogen. In this way one avoids an excessive consumption of nitrogen. Filling with LN.sub.2 is effected from a separating tank by means of a horizontal small-diameter pipe which during operation of the chamber is always exposed to and cooled by liquid nitrogen. Nitrogen in the form of a sweeping gas emerges in a boiling state from the tank and is guided through a cutting space (41') and can be heated by a heating plate fixed to sheet metal deflectors.