Patent ID: 8341854
Filing Date: 2013-01-01
Classification: F26B

Abstract:
1. A vacuum freeze-drying apparatus, comprising: a drying chamber; a spraying chamber connected to the drying chamber; a vacuum evacuation system for vacuum evacuating the drying chamber and the spraying chamber; a spraying unit for producing frozen particles by spraying a raw material liquid into an interior of the spraying chamber which is a vacuum ambience, a placing section where be frozen particles transferred from the spraying chamber to the drying chamber are placed, a cold trap for drying arranged to face the frozen particles on the placing section inside the drying chamber, a first cooling unit for cooling the drying cold trap to −70 degrees Celsius or below, a vacuum pump provided to the vacuum evacuation system and connected to the drying chamber and the vacuum pump vacuum evacuates the drying chamber to a pressure of 0.7 Pa or below, a cooling chamber connected to the spraying chamber; a cold trap for freezing arranged inside the cooling chamber; and a second cooling unit for cooling the freezing cold trap to −60 degrees Celsius or below, wherein a temperature of the placing section is controlled by heating to be higher than a temperature of the drying cold trap and to be lower than a temperature at which the frozen particles melt, and wherein the drying cold trap is cooled to be a temperature lower than a temperature of the freezing cold trap.