PROBLEM TO BE SOLVED: To provide a food freezing device suppressed in wasteful loss in cooling/heating low-temperature liquefied gas derived from a conveyor to reduce a quantity consumed of the low-temperature liquefied gas to be reduced in running costs.SOLUTION: The food freezing device is provided with: a heat-insulating tunnel 1 having a carry-in port 5 and a carry-out port 6 at its both ends a conveyor 22 extending to the inside of the heat insulating tunnel from the carry-in port to convey a to-be-frozen material (A) to the carry-out port from the carry-in port a low-temperature liquid gas supply part 3 supplying the low-temperature liquefied gas to the inside of the heat-insulating tunnel and an exhaust air duct 12 disposed nearer to the side of the carry-in port than to the low-temperature liquefied gas supply part of the heat-insulating tunnel to exhaust the vaporized low-temperature liquefied gas through the heat-insulating tunnel. The starting end part at the carry-in port side of the conveyor is positioned at a part nearer to the side of the carry-out port than the position of the exhaust air duct. The distance to the starting end part of the conveyor from the position of the end part at the side of the carry-out port of the opening part of the discharge duct is preferably 0-20 cm.COPYRIGHT: (C)2010,JPO&INPIT【課題】食品凍結装置におけるコンベアに由来する低温液化ガスの冷熱の無駄な損失を抑え、低温液化ガスの使用量を削減して、ランニングコストを低減する。【解決手段】搬入口5と搬出口6を両端に有する断熱トンネル1と、この断熱トンネル内に搬入口から搬出口に伸びて、被凍結物Aを搬入口から搬出口に向けて搬送するコンベア22と、断熱トンネル内に低温液化ガスを供給する低温液化ガス供給部3と、断熱トンネルの低温液化ガス供給部よりも搬入口側に配されて、気化した低温液化ガスを断熱トンネルから排出する排気ダクト12を備え、コンベアの搬入口側の始端部が、排気ダクトの位置よりも搬出口側に位置している。排気ダクトの開口部の搬出口側の端部の位置から前記コンベアの始端部までの距離が0~20cmであることが好ましい。【選択図】図1
