Air conditioning system for fresh-keeping transportation of fruits and vegetables and implementation method thereof

Abstract

The invention discloses an air conditioning system for fresh-keeping transportation of fruits and vegetables, which comprises a liquid nitrogen tank, a liquid nitrogen flow control mechanism, a vaporization device, a signal acquisition module, a human-machine interactive interface and an ECU. The invention also discloses an implementation method for the air conditioning system for the fresh-keeping transportation of the fruits and vegetables, which comprises the following steps of: acquiring signals of a temperature sensor, an oxygen sensor and a pressure sensor; if the monitored oxygen concentration is higher than a set value and the temperature is higher than a set value, starting a liquid outlet pipe electromagnetic valve of the liquid nitrogen flow control mechanism; if the oxygen concentration is higher than the set value or the temperature is lower than or equal to the set value, closing the liquid outlet pipe electromagnetic valve of the liquid nitrogen flow control mechanism; and if the monitored oxygen concentration is lower than or equal to the set value and the monitored temperature is higher than the set value, closing the liquid outlet pipe electromagnetic valve of the liquid nitrogen flow control mechanism. The system and the method have the advantages of high oxygen reducing speed, benefit for balance of temperature field, high intellectualization degree, good fresh-keeping effect, system safety and reliability, high accuracy, good stability and the like.

Description

technical field [0001] The invention belongs to the technical field of food fresh-keeping transportation, and in particular relates to a controlled atmosphere system for fruit and vegetable fresh-keeping transportation and a realization method thereof. Background technique [0002] When fruits and vegetables breathe, consume O 2 , exhaled CO 2 , while in the atmosphere O 2 The content is as high as 21%, and the controlled atmosphere provides a good environment for the preservation of fruits and vegetables. In order to suppress the respiration of fruits and vegetables, it is also necessary to put O in the box 2 The concentration was reduced to 3-5% VOL. With the improvement of people's living standards, consumers' pursuit of food safety and food quality is increasingly intense, which makes the market's requirements for fruit and vegetable preservation technology higher and higher, especially the preservation level of off-season fruit and vegetable products and long-distan...

AI Technical Summary

Problems solved by technology

Although there has been rapid development in fruit and vegetable storage and preservation technology, the penetration rate is far behind the needs of production development.

Moreover, domestic research mainly focuses on controlled atmosphere storage, and there are not many research applications on controlled atmosphere transportation (especially domestic transportation suitable for my country's national conditions).

[0004] International long-distance transport of fruits and vegetables generally uses nitrogen generators to reduce oxygen, which is costly and inefficient. It takes about 72 hours to reduce the oxygen concentration to the target value. It is of little significance to use nitrogen generators for domestic fruit and vegetable controlled atmosphere transport.

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