Quick-freezing device combining liquid ammonia with liquid nitrogen

Abstract

The invention discloses a quick-freezing device combining liquid ammonia with liquid nitrogen. The device comprises a temperature preservation quick-freezing chamber, a refrigeration storage unit anda liquid nitrogen pipe, the refrigeration storage unit is arranged in the temperature preservation quick-freezing chamber, and the liquid nitrogen pipe is arranged at the front end of the refrigeration storage unit; at least one temperature sensor is arranged in the temperature preservation quick-freezing chamber, and a plurality of spraying heads are arranged on the liquid nitrogen pipe; goods needing to be frozen are transported into the temperature preservation quick-freezing chamber through a transportation trolley, the refrigeration storage unit is started and refrigerates the inside of the temperature preservation quick-freezing chamber, so that the temperature of the inside of the temperature preservation quick-freezing chamber is reduced, when a worker observes that the temperaturesensed by the temperature sensors is reduced to be 0-3 DEG C, a valve on a liquid nitrogen tank is opened, and the liquid nitrogen can be sprayed from the spraying heads from the inside of the liquidnitrogen pipe; a draught fan of the refrigeration storage unit can make the liquid nitrogen sprayed from the spraying heads blown to food, so that the food is quickly cooled to be -196 DEG C, the freezing time is shortened, food cells cannot be damaged due to freezing, the freshness degree of the food is preserved to the largest extent, and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of quick-freezing of food, in particular to a quick-freezing device combining liquid ammonia and liquid nitrogen. Background technique [0002] With the development of the economy and the improvement of people's living standards, people not only require a variety of food to meet the needs of different groups of people, but also pay more attention to the freshness of the food and whether the delivery is timely. Therefore, quick-frozen food has become popular among the public in recent years. The mechanical device for quick freezing of food is called quick freezing device. [0003] Freshness is an important quality indicator of food and a key factor in determining food prices. Compared with traditional fresh-keeping technologies, liquid nitrogen quick-freezing technology is a major breakthrough and innovation in traditional freezing and fresh-keeping methods, which can greatly increase the added value of produ...

AI Technical Summary

Problems solved by technology

[0004] For existing frozen food, the food is placed on a transport trolley, which is transported to the interior of the cold storage's thermal insulation quick-freezing room, and then the cold storage unit is started. The interior of the cold storage unit mainly places liquid ammonia as a refrigerant, and the cold storage unit slowly cools the food. Cool down, the food just put into the freezer is about room temperature, and then the food is cooled in the freezer, down to 0 degrees Celsius, and finally down to about minus 33 degrees Celsius, because it takes a long time to cool down to minus 33 degrees Celsius, the freezing time is too long It will cause the cells to be frozen, and when the food is thawed, it will cause a large loss of water in the food, and it will no longer be fresh. Some factories choose to freeze the food directly with liquid nitrogen when freezing the food, and the food frozen in liquid nitrogen is thawed again. Finally, these foods are just like freshly picked foods, especially fresh, because the temperature of liquid nitrogen is low, and the food can be frozen instantly when freezing, and the cells will not be damaged, but the price of liquid nitrogen has always been too high

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