公开(公告)号：US5921091A

公开(公告)日：1999-07-13

申请号：US943332

申请日：1997-10-03

申请人： John Foss ,  Mike Mitcheltree ,  Pascal Schvester ,  Kent Renz ,  Joseph E. Paganessi ,  Lisa D. Hunter ,  Reena V. Patel ,  Darrin Baumunk

发明人： John Foss ,  Mike Mitcheltree ,  Pascal Schvester ,  Kent Renz ,  Joseph E. Paganessi ,  Lisa D. Hunter ,  Reena V. Patel ,  Darrin Baumunk

IPC分类号： F25D3/10 ,  A23B4/06 ,  A23B7/04 ,  A23L3/36 ,  A23L3/375 ,  F25D3/11 ,  F25D29/00 ,  F25D13/06

CPC分类号： F25D3/11 ,  A23L3/362 ,  A23L3/363 ,  A23L3/375 ,  F25D29/001

摘要： A cryogenic freezing method uses a mixture of liquid nitrogen and liquid oxygen in amounts approximating the composition of atmospheric air to freeze food products. The mixture preferably includes 18% to 25% oxygen and the balance nitrogen, with small amounts of residuals which are commonly found in air. The present invention involves replacing a liquid carbon dioxide or liquid nitrogen cooling medium which is used in known cryogenic freezers with a liquid nitrogen and liquid oxygen mixture. The liquid nitrogen and oxygen mixture can be used according the present invention in many of the known freezers using liquid carbon dioxide or liquid nitrogen as a cooling medium, including tunnel freezers, spiral freezers, and immersion freezers. The use of a liquid nitrogen and liquid oxygen mixture improves the efficiency of a freezer because the cold vapors are not exhausted from the freezer. In addition, the leakage of vapors from the freezer into the room air will not create unsafe conditions for workers.

摘要翻译： 低温冷冻方法使用液态氮和液态氧的混合物，其量接近大气的组成以冷冻食品。 混合物优选包含18％至25％的氧气和余量为的氮气，其中少量残余物通常存在于空气中。 本发明涉及用液氮和液氧混合物代替在已知的低温冷冻箱中使用的液态二氧化碳或液氮冷却介质。 根据本发明，可以使用液态二氧化碳或液氮作为冷却介质，包括隧道式冷冻机，螺旋冷冻机和浸入式冷冻机，在许多已知的冷冻机中使用液氮和氧气混合物。 使用液氮和液氧混合物可以提高冷冻机的效率，因为冷蒸汽不会从冷冻机中排出。 此外，蒸汽从冷冻室泄漏到室内空气中也不会给工人造成不安全的状况。