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Corona discharge low-temperature plasma device, litchi fresh-keeping device and fresh-keeping method

A low-temperature plasma and corona discharge technology, applied in the preservation of fruits/vegetables by radiation/electrical treatment, food electric treatment, preservation of food ingredients as antimicrobials, etc. , large floor space and other problems, to achieve deodorization and removal of agricultural residues, reduce use costs and use thresholds, and reduce pressure loss

Pending Publication Date: 2020-12-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Low temperature storage requires large-scale cold storage equipment, which consumes a lot of energy and occupies a large area; controlled atmosphere storage requires additional gas adjustment devices and multiple testing equipment, which is costly and unstable; chemical and biological preservatives will cause bad smell and chemical residues More importantly, the above technologies cannot quickly realize the fresh-keeping treatment of litchis at the moment they leave the branches.

Method used

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  • Corona discharge low-temperature plasma device, litchi fresh-keeping device and fresh-keeping method
  • Corona discharge low-temperature plasma device, litchi fresh-keeping device and fresh-keeping method
  • Corona discharge low-temperature plasma device, litchi fresh-keeping device and fresh-keeping method

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Experimental program
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Effect test

Embodiment 1

[0042] A corona discharge low-temperature plasma device is a parallel corona discharge plasma device. Such as figure 1 , 2 As shown, it includes: discharge area 9, transformer 10, and pulse power supply 11. Discharge area 9 is composed of a plurality of parallel and parallel columnar spaces with the same structure. The outermost structure of each columnar space is a hollow columnar glass tube, and low-voltage mesh electrodes 14 is close to the inner wall of the hollow cylindrical glass tube, and the center of the columnar space is a high-voltage linear electrode 7. The two ends of the hollow cylindrical glass tube are closed by the cover plate 15, which has air holes 8 on the cover plate 15. The high-voltage linear electrode 7 of each columnar space in the discharge area 9 is connected to one end of the transformer 10 and the pulse power supply 11 through the electrode lead-out line 6, and the low-voltage mesh electrode 14 of each columnar space is connected to the transforme...

Embodiment 2

[0050] A corona discharge low-temperature plasma litchi fresh-keeping device, comprising: a fresh-keeping container and a corona discharge low-temperature plasma device, the fresh-keeping container includes a container body and a container cover, the container cover is equipped with a corona discharge low-temperature plasma device, the container body and the container cover Snap closure.

[0051] One or more cubic protrusions, preferably four cubic protrusions, are distributed along the upper end of the container body, and are used for snap-fit ​​closure with the container lid.

[0052] The container cover is a double-layer hollow structure, and the two layers are separated by a plastic plate with holes, and the plastic plate can be disassembled. The upper layer is used to store the pulse power supply and transformer, the lower layer is used to store the discharge area, and the holes are used to place the electrode lead wires. There is an opening at the upper end of the conta...

Embodiment 3

[0058] A kind of corona discharge low-temperature plasma litchi preservation method, comprising:

[0059] (1) Lychees are placed in the container body, covered with a container cover equipped with a corona discharge low-temperature plasma device;

[0060] (2) start the corona discharge plasma equipment in the container cover, set the voltage range of the corona discharge plasma device to be 0-15kV, the frequency control is 10-50kHz, the power control is at 50-500W, and the litchi sample is processed 8- 10 minutes, can realize the freshness of lychees at the source, and can extend the shelf life of lychees for 2-3 days.

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Abstract

The invention belongs to the field of fruit and vegetable preservation, and relates to a corona discharge low-temperature plasma device. The corona discharge low-temperature plasma device comprises adischarge area, a transformer and a pulse power supply, wherein the discharge area is composed of a plurality of columnar spaces which are connected in parallel side by side and are of the same structure, the outermost layer structure of each columnar space is a hollow columnar glass tube, a low-voltage mesh electrode is tightly attached to the inner wall of each hollow columnar glass tube, a high-voltage linear electrode is arranged in the center of each columnar space, the two ends of each hollow columnar glass tube are sealed by cover plates, and air holes are reserved in the cover plates;and the high-voltage linear electrode of each columnar space of the discharge area is connected with one end of a transformer and one end of a pulse power supply through electrode outgoing lines, andthe low-voltage mesh electrode of each columnar space is connected with the other end of the transformer and the other end of the pulse power supply through electrode outgoing lines to form a closed loop. The adopted parallel corona discharge plasma device is small in occupied area and wide in treatment area. The invention further discloses a litchi preservation device and method by using the corona discharge low-temperature plasma .

Description

technical field [0001] The invention relates to the field of fresh-keeping of fruits and vegetables, in particular to a corona discharge low-temperature plasma device, a litchi fresh-keeping device and a fresh-keeping method. [0002] technical background [0003] The quality of lychees changes drastically after harvesting, including browning of the pericarp, dehydration and shriveling, and poor taste. This change will occur the moment the litchi leaves the branch. Increased metabolism and microbial infestation. According to market research, the primary factor affecting litchi sales is the browning of the fruit skin. According to scientific research, the occurrence of browning is mainly related to polyphenol oxidase (PPO) and peroxidase (POD). Low-temperature plasma technology has unique advantages in inhibiting browning. By acting on the surface of litchi with low-temperature plasma, the PPO and POD in the peel undergo irreversible structural changes, fundamentally solving...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23B7/015
CPCA23B7/015A23V2002/00A23V2200/10A23V2300/12
Inventor 成军虎李季林孙大文韩忠
Owner SOUTH CHINA UNIV OF TECH
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