To provide a compact refrigeration device of high performance capable of reducing temperature difference at an entrance of a freezing chamber.
This refrigeration device comprises the freezing chamber 11 for freezing a treated object inside, a mixer 12 having a first inflow opening 21, a second inflow opening 22 and an outflow opening 23, for allowing refrigerant gases flowing therein to be mixed and flow out, an air distributing portion 13 for allowing the refrigerant gas flowing therein to be divided into two and flow out, a first flow channel 14 to allow one side of the refrigerant gas flowing out from the air distributing portion to pass through one of flow channels in a heat exchanger 42, then to pass through the other flow channel in the heat exchanger 42 through a compressor 43 and a cooler 44, to exchange the heat between the refrigerant gases of both flow channels, and to be led out to the first inflow opening 21 through an expander 45, a second flow channel 15 for guiding the other side of the refrigerant gas flowing out from the air distributing portion 13 to the second inflow opening 22, a third flow channel 16 for guiding the refrigerant gas from the outflow opening 23 to the freezing chamber 11, and a forth flow channel 17 for guiding the refrigerant gas passing through the freezing chamber 11 to the air distributing portion 13.
YOSHIMURA SEIJI
MIYAJI TOSHIKAZU
Yasumichi Furukawa
Atsushi Maeda
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