Introduction to Vacuum Pre cooling Machine

　　A vacuum pre cooling machine is a cooling and processing equipment that utilizes vacuum pre cooling technology to rapidly evaporate water by reducing air pressure, thereby achieving rapid cooling of food and other materials. The following is a detailed introduction about the vacuum precooler:

　    1、 Working principle

　　The working principle of a vacuum precooler is based on the physical properties of water: at one standard atmospheric pressure, the boiling point of water is 100 ℃, and the heat of evaporation is 2256kJ/kg. When the environmental pressure decreases, the boiling point of water will also decrease accordingly, and the heat of evaporation will increase. The vacuum precooler uses a vacuum pump to extract air and water vapor from the vacuum chamber, reducing the air pressure inside the vacuum box, lowering the boiling point of water, and increasing the latent heat of evaporation. At this point, the free water on the surface of the cooled object undergoes vaporization, taking away the heat from itself and the surrounding environment, thereby achieving a rapid cooling effect.

　    2、 Main features

　　Fast cooling speed: The vacuum pre cooler can quickly reduce the temperature of food to the ideal preservation and refrigeration temperature (usually 0 ℃~4 ℃), with a cooling cycle of more than 20 minutes, from an initial temperature of around 90 ℃ to the preservation and refrigeration temperature.

　　1. Uniform cooling: During the vacuum cooling process, the cooling temperature of the food depends entirely on the vacuum degree inside the box, which is equal throughout the box, ensuring the uniformity of the food temperature.

　　2. Maintaining Quality: Vacuum pre cooling avoids problems such as food deformation and discoloration that may occur in traditional cooling methods, and can maximize the preservation of the original quality and taste of food.

　　3. Extended shelf life: The physiological changes in food after cooling are slowed down, which can extend the storage or shelf life of the product.

　　4. Avoiding secondary pollution: After the vacuum pre cooler is cooled, the box is pressurized and fed in. The air filled in is filtered according to food safety standards and contains almost no suspended dust, effectively avoiding secondary pollution of food by dust suspended in the air.

　　5. Improve production efficiency: The vacuum pre cooler is easy to operate and has a high degree of automation, which can greatly improve the efficiency of food production.

　　3、 Application Fields

　　Vacuum pre cooling machines are widely used in the production and processing of various fresh agricultural products and cooked food products, including but not limited to:

　　1. Vegetables: leafy vegetables, stem vegetables, cauliflower, mushroom vegetables, etc.

　　2. Staple food: rice, noodles, Mantou, corn and other staple foods, as well as dumplings, sushi, preserved fruit and other processed foods.

　　3. Poultry: steamed or grilled chicken and duck, as well as cooked foods such as salted goose.

　　4. Meat products: steamed pork, beef, sheep, rabbit meat, etc.

　　5. Fish and shrimp: river fish, sea fish, shellfish, shrimp, crabs and other seafood.

　　6. Fried foods: fried foods, fried meatballs, etc.

　　7. Baking products: mooncakes, cakes, bread, egg yolk pies, and other baked goods.

　　8. Filling materials: moon cake filling, dumpling filling and all kinds of conditioning food.

　　In addition, vacuum precoolers can also be applied for cooling treatment in industrial fields such as chemical high-temperature materials, crystals, and metal casting sand.

　　4、 Equipment parameters

　　The parameters of a vacuum precooler may vary depending on the model and manufacturer, but typically include the following aspects:

　　Capacity: Usually measured by the quantity or weight of food suitable for processing, common units of capacity include kilograms, tons, or processing capacity per hour.

　　Working temperature: refers to the temperature range for rapid cooling in a vacuum environment, depending on the type and requirements of the food being processed.

　　Vacuum degree: Usually expressed in pressure units (such as pascals) or vacuum degree levels (such as absolute pressure), the level of vacuum directly affects the cooling effect.

　　Cooling time: depends on the design and specifications of the equipment, as well as the characteristics of the processed food.

　　Power: Refers to the electrical demand of a device, usually measured in watts (W) or kilowatts (kW).

　　Control system: used to monitor and regulate temperature, vacuum degree, time, and other operating parameters, which can be manual or automated.

　　5、 Operation and maintenance

　　Pre operation inspection:

　　Check if the oil level of the compressor, the high and low pressure gauges of the refrigeration system, and the oil level of the vacuum pump are normal.

　　1. Observe whether the color of the vacuum pump oil is emulsified, and replace it promptly if there is emulsification.

　　2. Check if the water level in the cooling tower is normal.

　　Precautions for operation:

　　1. The machine needs to be operated by trained professionals.

　　2. During use, the vacuum pump should be regularly emptied to avoid water accumulation that could affect equipment performance.

　　3. Determine the pre cooling time based on the properties of the cooled object and set the temperature parameters reasonably.

　　Maintenance and upkeep:

　　1. Regularly clean and disinfect the equipment to maintain its hygiene.

　　2. Regularly check whether the various parameters of the equipment are normal, and promptly handle any abnormalities.

　　3. Perform regular maintenance and upkeep according to the equipment manual to extend the service life of the equipment.

　　6、 Development Trends

　　With the rapid development of cold chain logistics and the continuous improvement of consumers' requirements for food quality, the application prospects of vacuum pre cooling machines in the field of food preservation are becoming increasingly broad. In the future, vacuum pre cooling machines will develop towards higher efficiency, intelligence, and environmental friendliness, providing more reliable technical support for food preservation.

　　In summary, vacuum pre cooling machine is an efficient and reliable cooling processing equipment that plays an important role in the field of food preservation. By delving into its working principle, characteristics, application areas, and operation and maintenance methods, we can better leverage the advantages of vacuum pre cooling machines and provide better solutions for food production.

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