Patent ID: 6745490
Filing Date: 2004-06-08
Classification: F26B

Abstract:
In a freeze-drying apparatus for desiccating moisture content in liquid material by its sublimation under a vacuum condition, said apparatus comprising a desiccating chamber for freeze-drying said liquid material to be charged therein, said desiccating chamber being constructed with an upright cylindrical tube; a jacket, provided on an outer periphery of said tube, to circulate heat medium on and around the outer circumference of said tube; a duct communicatively connected with a vacuum exhaust system, on an upper end side of said tube, said liquid material being frozen onto an inner wall surface of said tube,a distributive ejection device for the liquid material comprising a cylindrical wall upwardly projecting high above said jacket which surrounds the outer periphery of said tube, in a manner to elongate said cylindrical wall, at the upper end side of the upright cylindrical tube; a downstream side of a tube passageway for feeding the liquid material being introduced into the duct connected to the upper end side of said tube; a distributive ejection nozzle to eject said liquid material being positioned and disposed at the terminal part of the downstream side to enable the ejected liquid material to be blown against an inner wall surface of said cylindrical wall, thereby rendering uniform the liquid material, ejected from said distributive ejection nozzle, in the circumferential direction of said tube by the inner wall surface of said cylindrical wall to feed the liquid material to the inner wall surface of said tube.