The invention relates to a heat exchange plate layer structure and a manufacturing method of a freeze drier. The heat exchange plate layer structure is characterized in that an integral seal structure formed by the
welding of
copper-
platinum brazing is arranged among upper and lower bottom plates and division bars which are arranged at intervals. The manufacturing method comprises the steps of: placing
copper platinum among the upper and lower bottom plates and the division bars which are arranged at intervals, clamping the
copper platinum by using a clamp, putting the copper platinum into a vacuum
brazing furnace and melting the copper platinum at high temperature, implementing vacuum on the vacuum
brazing furnace in a process, melting the copper platinum when the brazing temperature is achieved, cooling, and then pouring
silicone oil so as to form the heat exchange plate layer structure of the freeze drier. The heating of local parts caused by
welding does not exist, the plate layer transformation is small, the smoothness is good, the heat exchange plate layer structure is beneficial to
polishing and reshaping, the division bars and the upper and lower bottom plates are closely spliced, the
welding is good, and
silicone oil can not be in
short circuit so as to avoid fleeing to the other side of the plate layer directly from the upper parts or the lower parts of the division bars; the temperature of the plate layer is very uniform, the welding is conducted in the plate layer, so that the influence on the exterior of the plate layer is low, and the smoothness of the plate layer is guaranteed; and the welding seams are arranged in the plate layer, and the whole plate does not have holes and gaps and the possibility of the plate layer leakage does not exist.