Cooling apparatus for the rapid cooling of specimens

Refrigeration – Refrigeration producer – Evaporator – e.g. – heat exchanger

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62 49, 62 55, F25B 1900

Patent

active

044895690

ABSTRACT:
A cooling apparatus utilizing liquid nitrogen for cooling specimens to temperatures in the range from -100.degree. C. to -195.degree. C. in propane, halogenated hydrocarbons, isopentane, or other cooling media. Freezing of the cooling media is avoided by means of an arrangement wherein the liquid nitrogen cools the cooling-bath container and/or the liquifier only initially, but after the desired cooling-bath temperature has been reached, the liquid nitrogen level is lowered to below the height of a protective shell which results in further cooling being only indirect, via solid/solid contacts and via the gas phase. A constant cooling-bath temperature is ensured by means of a thermostatic temperature-control system while trouble-free standby operation is ensured by means of an automatic system for replenishing liquid nitrogen, and by a system for controlling the level of liquid nitrogen. Safe disposal of the cooling media which may be combustible and/or toxic is provided for.

REFERENCES:
patent: 3066222 (1962-11-01), Poorman et al.
patent: 3110157 (1963-11-01), Radd
patent: 3880193 (1975-04-01), Lewis
patent: 4327799 (1982-05-01), Scheiwe et al.
patent: 4336691 (1982-06-01), Burstein et al.

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