Two stage Rotary Vacuum Pump in Fresh keeping of Fruits
In recent years, with the growth of demand for high quality frozen food, at the same time, an important quality index of fruits and vegetables is freshness, and consumers are increasingly demanding freshness. Preservation at room temperature can not meet people's requirements for freshness. Reducing temperature is an effective method commonly used. After harvesting fruits and vegetables, the key step is how to quickly eliminate the field heat and make its temperature center temperature close to freezing point. Therefore, vacuum precooling technology is more and more applied in the field of food preservation. Based on the brief introduction of the principle, characteristics and application of the two-stage rotary vane vacuum pump, the importance of the vacuum pre-cooling process of fruits and vegetables was analyzed, and the application of the two-stage rotary vane vacuum pump in the preservation of fruits and vegetables was summarized.
The preservation and processing of agricultural products is the continuation of agricultural production and the "second-yield economy" in the process of agricultural reproduction. The developed countries all put postpartum storage and processing in the primary position of agriculture. In addition to the high added value brought by preservation and processing, only reducing the loss of existing fruits and vegetables can bring about nearly 100 billion yuan of benefits for the society.
There are two main types of fresh-keeping technology, temperature-controlled storage and controlled atmosphere storage.
Temperature-controlled storage: (1) simple storage, (2) refrigeration, (3) control of freezing point storage.
Controlled Atmosphere Storage: (1) CA Controlled Atmosphere Storage, (2) MA Controlled Atmosphere Storage, (3) Plastic Film Account Controlled Atmosphere Storage
Refrigeration is one of the main forms of modern fruit and vegetable storage. It uses a lower freezing point than fruit and vegetable tissues to keep fruits and vegetables fresh. Storage can be carried out on the anniversary of high temperature season to ensure the annual supply of fruits. Cold storage can reduce the respiratory metabolism of fruits and vegetables, the incidence of pathogenic bacteria and the rot rate of fruits, so as to prevent the senescence of tissues and prolong the storage period of fruits. But in the cold storage, the unsuitable low temperature will affect the storage life and lose the commodity and edible value. The key to prevent chilling injury and freezing injury is to strictly control the temperature according to the habits of different fruits and vegetables. During the refrigeration period, some fruits and vegetables, such as Yali pear, need to adopt the method of gradual cooling to alleviate or avoid chilling injury. In addition, pre-cooling treatment before storage, warming-up treatment during storage and chemical treatment can alleviate chilling injury of fruits and vegetables. Therefore, a two-stage rotary vane vacuum pump is needed.
Two-stage rotary vane vacuum pump characteristics:
1. Master the core technology of three-blade structure to make the operation easier.
2. Simple structure and convenient maintenance
3. Stable performance and durability
4. Compact design
5. Strong ability to drain steam
6. Low noise and vibration
7. Water-cooled options
8. Motors are suitable for various standard voltages and frequencies
Dual-stage rotary vane vacuum pump is made of ferrous metal, and it is more precise. The work of the whole pump is linked together. Therefore, it is not suitable for pumping all kinds of gases which contain too much oxygen, toxic, explosive, erode ferrous metal and have chemical effect on vacuum oil, nor can it be used as compressor or and conveying pump. If there is a pump with an air-ballast device, a certain amount of condensable vapor can be removed.
Two-stage rotary vane vacuum pump Application:
Vacuum coating, chemical/pharmaceutical, automotive industry, metallurgical/vacuum furnace, bulb/energy-saving lamp, kinescope, environmental engineering, air conditioning/refrigeration, electric power engineering, mechanical engineering, pharmaceutical technology, vacuum drying, chemical research laboratory, freeze-drying, vacuum packaging, front pump of high vacuum system.
Vacuum pre-cooling is a good way to keep fruits and vegetables fresh. It is currently the highest technology content of fruit and vegetable pre-cooling technology. Vacuum precooling technology has been widely used in fruit and vegetable preservation in developed countries such as Europe, America and Japan. In fact, vacuum cooling has attracted great attention. Its application extends to the processing of flowers, mushrooms, fish, meat, ham and other products. In this paper, the research results and results of the application of two-stage rotary vane vacuum pump in fruit and vegetable preservation are summarized comprehensively, in order to further promote the application of vacuum pre-cooling technology in this field.
SV Rotary Vane Vacuum Pump