Quick-freezing fresh-keeping method and tunnel-type fresh-keeping quick-freezing machine

Abstract

The invention discloses a quick-freezing fresh-keeping method and a tunnel-type fresh-keeping quick-freezing machine. The tunnel-type fresh-keeping quick-freezing machine comprises a fixing frame, a transmission roller shaft and a storehouse body, wherein the storehouse body is provided with a transmission mesh belt; the storehouse body is arranged on the fixing frame; a fresh-locking chamber anda freezing chamber are arranged in the storehouse body; the fresh-locking chamber and the freezing chamber are mutually connected; a liquid nitrogen spraying device is arranged in the fresh-locking chamber; a plurality of atomizing spray heads are arranged on the liquid nitrogen spraying device; an air cooling device is arranged in the freezing chamber; the storehouse body is provided with a regulating and controlling system electrically connected with the liquid nitrogen spraying device and the air cooling device; and the two ends of the storehouse body are provided with a feeding port and adischarging port. According to the quick-freezing fresh-keeping method and the tunnel-type fresh-keeping quick-freezing machine, the mechanical compression refrigeration and the liquid nitrogen refrigeration are effectively combined, a frost protection layer is formed on the surface of material by spraying liquid nitrogen to protect the moisture of the material from losing so as to ensure the freshness of the material, and then a mechanical compression refrigeration is adopted to carry out deep refrigeration so as to avoid dehydration of the surface of the material due to direct air cooling soas to ensure the freshness and taste of the material; and meanwhile, the fresh-locking and fresh-keeping effect are achieved, full-automatic operation is achieved according to set parameters, and energy consumption is reduced.

Description

technical field [0001] The invention relates to a quick-freezing machine, in particular to a quick-freezing and fresh-keeping method and a tunnel-type fresh-keeping quick-freezing machine mainly used for foods such as vegetables and fruits. Background technique [0002] The quick freezer is a device used for quick freezing of food in the food processing industry. It is widely used in the food processing industry. The refrigeration methods of the food quick freezer in the prior art mainly include mechanical compressor refrigeration and liquid nitrogen refrigeration. Most manufacturers adopt the conventional mechanical compression refrigeration method. This method uses the fan to blow the cold air to the material to achieve the effect of freezing. However, the cooling time of this refrigeration method is longer, which increases energy consumption. The continuous blowing to the food causes more water loss on the surface of the food, which easily leads to dehydration on the surf...

AI Technical Summary

Problems solved by technology

[0002] The quick freezer is a device used for quick freezing of food in the food processing industry. It is widely used in the food processing industry. The refrigeration methods of the food quick freezer in the prior art mainly include mechanical compressor refrigeration and liquid nitrogen refrigeration. Most manufacturers adopt the conventional mechanical compression refrigeration method. This method uses the fan to blow the cold air to the material to achieve the effect of freezing. However, the cooling time of this refrigeration method is longer, which increases energy consumption. The continuous blowing to the food makes the water on the surface of the food lose more, which easily leads to the dehydration of the surface of the material, which greatly reduces the freshness and taste of the food

Especially for vegetables, fruits, meat and other foods that require high freshness and taste, in order to achieve a good quick-freezing effect and reduce the loss of food moisture, liquid nitrogen is now used to replace the traditional refrigeration system to quick-freeze food on the market. , based on the extremely low temperature characteristics of liquid nitrogen -196°C, it can quickly form ice on the surface of food to lock water, effectively protect the surface of food from dehydration, and ensure the freshness and taste of food. This is a traditional equipment-made compression freezing quick freezer It is incomparable, and at the same time, it can reduce the loss of water due to the strong wind required by traditional mechanical freezing. However, when using liquid nitrogen for quick freezing, all liquid nitrogen is used for quick freezing, which makes the consumption of liquid nitrogen very large. , causing an increase in the cost of

The above two most commonly used quick-freezing methods have their own advantages and disadvantages, which affect the optimal use of customers.

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