REFRIGERATED CHAMBER FOR OBTAINING THIN SLICES AT LOW TEMPERATURE

摘要

PCT No. PCT/EP87/00596 Sec. 371 Date Apr. 14, 1989 Sec. 102(e) Date Apr. 14, 1989 PCT Filed Oct. 13, 1987 PCT Pub. No. WO88/02851 PCT Pub. Date Apr. 21, 1988.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 LN2. 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 LN2 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.