Rotary vane vacuum pump used in fruit and vegetable vacuum precooling _

rotary vane vacuum pump application in fruit and vegetable vacuum precooling. Vacuum precooling refers to the normal atmospheric pressure ( 101. 325 kPa） The water evaporation in the 100 ° C. If the atmospheric pressure is 610 Pa, water evaporation in the 0 ° C, the boiling point of water reduce atmospheric pressure with the environment. Boiling is a rapid evaporation, can quickly absorb heat. Put fresh fruits and vegetables in an airtight container, rapid extraction of air and water vapor. As pressure continues to decline, fruits and vegetables will be through continuous rapid evaporation of water to cool. Used for vacuum precooling fruit and vegetable processing equipment, rotary vane vacuum pump is cool instead of refrigeration equipment. Its purpose is to make the fast cooling to the set temperature, fruit and vegetables and then remove the items from the device, or put them in the air, or directly, or put them into the freezer. Dormant because of fruits and vegetables, the process of dynamic recovery will take a time, this is life.

why choose rotary vane vacuum pumps to vacuum precooling of fruits and vegetables?

rotary vane vacuum pump in vacuum technology is one of the most basic vacuum acquisition equipment. This is a kind of oil seal type vacuum pump, pumping speed, small volume, extreme high vacuum degree, low noise. Play an important role in this kind of vacuum pump, oil, it can seal and three functions for lubrication and cooling. Through the use of the rotary vane vacuum pumps can be fully realized precooling fruits and vegetables ( ≤660 pa) The vacuum degree required. However, as mentioned above, the principle of vacuum cooling is used during water evaporation heat to cause the cooling. As a result, in the process of cooling water vapor. If the water vapor directly into rotary vane pump, will lead to pump oil emulsification, this will not only affect the performance of the pump, can also cause damage to the pump body itself. Solution is to add a header in front of the pump, the water vapor condenses into water. So we must reconfigure the refrigeration system, in order to have to remove the air moisture by vacuum pump discharge.

used in vacuum precooling of fruits and vegetables rotary vane vacuum pumps are usually designed according to the principle mentioned above. The basic parts for vacuum box, Siamese, refrigerating unit and rotary vane vacuum water pump.

the basic principle of vacuum cooling in the vacuum cooling water loss is in commonly 3%, won't make the fruit and vegetables become soft and fresh. Due to pressure difference of fruits and vegetables inside and outside the organization, organization of the harmful gas and heat were extracted, which can delay menopause respiratory peak of fruits and vegetables. Therefore, in the case of vacuum cooling, cooling at the same time from the organization's internal to the external, namely uniform cooling, which is peculiar to the vacuum cooling, and any other cooling method 'penetration' from the outside slowly cooling surface to the organization, so save time.

rotary vane vacuum water pump vacuum cooling compared with other cooling has the following characteristics:

1, save time, directly without entering the cold storage transportation, without insulation truck for short distance transportation;

2。 Fast cooling time, generally only 20 minutes, packaging can be used with a vent;

3。 Keep the best sensory and quality of fruits and vegetables, Color, aroma, taste and nutrition) ;

4。 Can inhibit or kill bacteria and microorganisms;

5。 With 'thin layer drying effect' - Small damage on the surface of the fruits and vegetables can be 'healing' healing or will not continue to enlarge;

6。 The environmental pollution-free;

7。 Low operating costs;

8。 It can prolong shelf life. Vacuum precooling leaf vegetables can be directly imported into high-end supermarket without the need for refrigeration.

rotary vane vacuum water pump application in fruit and vegetable vacuum precooling can cooling field are packed in cartons of fresh vegetables, to eliminate the heat field. It than direct more quickly and evenly in the cold storage, especially when the internal and external cooling uniformity, cold storage cold outside. After vacuum pretreatment of vegetables can prolong 7 to 10 days. The low temperature cold chain in protecting consumers' health and improve the quality of people's life plays a huge role.

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