CN214677405U - Multi-field coupling antiseptic fresh-keeping system suitable for fruit and vegetable storage and transportation microenvironment regulation - Google Patents

Abstract

The utility model relates to a multi-field coupling antiseptic fresh-keeping system suitable for microenvironment regulation and control of fruit and vegetable storage, which comprises a fresh-keeping agent dispensing unit, a fresh-keeping agent low flux density magnetostatic field collaborative precooling processing unit, an ultrasonic pressurization first-stage atomization unit, a gas-liquid two-phase second-stage atomization unit, a high-pressure pure nitrogen storage and control unit, a pure nitrogen pressurization unit, a nitrogen membrane separation preparation system and an air multi-stage purification unit, the utility model designs the organic combination of the fresh-keeping agent low flux density magnetostatic field collaborative precooling processing technology, the ultrasonic high-pressure spraying combined static pressure ionization three-stage atomization technology and the air multi-stage purification and micro membrane nitrogen production technology, realizes the nano-scale atomization antibacterial effect of more than 10 plant sources such as chlorine dioxide, hydrogen peroxide, plant essential oil and organic acid and green chemical antibacterial agent, improves the novel efficient safe use of food-grade antibacterial agent, is suitable for different types of fruits and vegetables and is used alternatively to avoid the drug resistance of pathogenic bacteria, can be industrially applied to the storage, transportation, sale and fresh-keeping of fruits and vegetables.

Description

Multi-field coupling antiseptic fresh-keeping system suitable for fruit and vegetable storage and transportation microenvironment regulation

Technical Field

The utility model belongs to the fresh-keeping field of agricultural product storage relates to fruit vegetables storage and transportation technique, especially a anticorrosive fresh-keeping system of many places coupling suitable for fruit vegetables storage and transportation microenvironment regulation and control.

Background

The storage and preservation of fruits and vegetables are a system engineering technology, the temperature, the humidity, the gas and the corrosion prevention are four major factors of the modern preservation of fruits and vegetables, and the corrosion prevention is the key of the preservation of fruits and vegetables. Pathogenic bacteria are the main reasons for causing fruit and vegetable rot and causing food-borne diseases, the drug resistance is increased year by year, and the types, the dosage and the treatment time of the pesticide are also increased year by year, so that hundreds of pesticides have to be developed in order to deal with dozens of common pathogenic bacteria.

However, pathogenic bacteria are mainly hidden in the positions of furrows, skin holes, air holes, stalk pits and the like on the surface of fruits and vegetables, the conventional soaking, spraying or fumigating treatment method is difficult to kill, in addition, secondary mechanical injury and secondary pathogenic bacteria infection are generated in the multi-stage treatment of soaking, drying, packaging and the like, the cost is also increased, and the quality of the fruits and vegetables for preservation and preservation is unfavorable.

Through a search of the prior published patent documents, there are several published patent documents similar in technology as follows:

1. the utility model provides an essential oil champignon machine atomizing chamber (publication number CN110947019B), discloses an essential oil champignon machine atomizing chamber, including bottom atomizing cavity, its characterized in that: the utility model discloses an essential oil champignon machine atomizing chamber, including bottom atomizing cavity, liquid conveying pipe, support fixedly connected with bottom small opening disc, the inboard top of bottom atomizing cavity is provided with essential oil storage cavity, the fixed high temperature steam atomizing cavity that is provided with in top of bottom atomizing cavity, the bottom of essential oil storage cavity is run through there is bottom imbibition nozzle stub, the top of bottom imbibition nozzle stub is connected with liquid conveying pipe, liquid conveying pipe runs through in the bottom of high temperature steam atomizing cavity and extends to the inside of high temperature steam atomizing cavity, support fixedly connected with bottom small opening disc is passed through to the bottom of essential oil storage cavity, the outside cover of liquid conveying pipe is equipped with outer essential oil transmission pipe, the utility model discloses when having avoided using essential oil champignon machine atomizing chamber, essential oil champignon machine atomizing chamber is difficult to pass through high temperature atomizing steam simultaneously to quick convenient add essential oil in high temperature atomizing steam, influence the result of use in essential oil champignon machine atomizing chamber

The disclosed patent technology provides a high-temperature atomization technology, but the high-temperature atomization liquid has large atomization particle size and is not suitable for the preservation of a low-temperature refrigeration house.

2. A device and a method for manufacturing high-pressure atomized ozone water (publication number CN107308835B) provide a device and a method for manufacturing high-pressure atomized ozone water, which relate to the field of environmental management. The device comprises a first pressurizing device, an ozone generator, a water supply device, a first pipeline, a second pipeline and a spraying device, wherein the first pressurizing device is communicated with the ozone generator, the first pipeline is communicated with the ozone generator and the spraying device respectively, and the second pipeline is communicated with the water supply device and the spraying device respectively. The first pressurizing device is used for inputting high-pressure air to the ozone generator, the ozone generator is used for converting part of the high-pressure air into high-pressure ozone and inputting the high-pressure ozone or the high-pressure air which is not converted into the spraying device; the water supply device is used for inputting water or ozone water into the spraying device so that the water and the high-pressure ozone are mixed in the spraying device to form atomized ozone water or the ozone water and the unconverted high-pressure air are mixed in the spraying device to form atomized ozone water. The utility model can provide a clean element which can clean air, dissolve chemical gas and ensure environmental sanitation.

Although ozone has a certain bacteriostatic effect, high-pressure liquid atomization is large in particle size and can only atomize ozone, and the use limitation of equipment is large.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome prior art's weak point, a anticorrosive fresh-keeping system of multi-field coupling suitable for fruit vegetables storage and transportation microenvironment regulation and control can realize chlorine dioxide, peracetic acid, hydrogen peroxide, plant essential oil and organic acid etc. 10 multiple botanical and the nanometer atomizing antibacterial effect of green chemistry bacteriostat, improves the novel high-efficient safe use of food level bacteriostat, is applicable to different grade type fruit vegetables and alternative use and avoids the pathogenic bacteria drug resistance, can industrialization be applied to fruit vegetables and store the fortune and sell fresh-keeping.

The utility model provides a its technical problem take following technical scheme to realize:

a multi-field coupling antiseptic fresh-keeping system suitable for microenvironment regulation and control of fruit and vegetable storage and transportation comprises an antistaling agent dispensing unit, an antistaling agent low magnetic flux density static magnetic field collaborative pre-cooling processing unit, an ultrasonic pressurization first-stage atomization unit, a gas-liquid two-phase second-stage atomization unit, a high-voltage electrostatic field nanometer third-stage atomization unit, a high-voltage pure nitrogen storage and control unit, a pure nitrogen pressurization unit, a nitrogen membrane separation preparation system and an air multi-stage purification unit, wherein an antistaling agent outlet of the antistaling agent dispensing unit is connected with an antistaling agent inlet of the antistaling agent low magnetic flux density static magnetic field collaborative pre-cooling processing unit, an antistaling agent outlet of the antistaling agent low magnetic flux density static magnetic field collaborative pre-cooling processing unit is connected with the ultrasonic pressurization first-stage atomization unit, a gas outlet of the air multi-stage purification system is connected with a gas inlet of a nitrogen membrane separation preparation system, and a nitrogen outlet of the nitrogen membrane separation preparation system is communicated with a nitrogen inlet of the pure nitrogen pressurization unit, the nitrogen outlet of the pure nitrogen pressurizing unit is connected with the high-pressure pure nitrogen storage and control unit, the ultrasonic pressurizing first-stage atomizing unit and the high-pressure pure nitrogen storage and control unit are communicated to the gas-liquid two-stage atomizing unit through the booster pump, and the outlet end of the gas-liquid two-stage atomizing unit is connected with the high-pressure electrostatic field nanometer third-stage atomizing unit.

The fresh-keeping agent dispensing unit comprises a plurality of unit liquid dispensing tanks connected with the liquid mixing tanks through liquid pumps, the fresh-keeping agent low-magnetic-flux-density static magnetic field collaborative precooling processing unit comprises a processing box, a static magnetic field coil is arranged outside the processing box, a magnetic field sound insulation box is arranged outside the static magnetic field coil, the processing box is connected with an external cold water circulating system, the cold water circulating system is externally connected with an ethylene glycol refrigerating circulating system, and the outlet end of the liquid mixing tank is connected into the processing box in an extending mode.

And the cold water circulating system comprises an evaporator, the evaporator is externally connected with a condenser and an ethylene glycol liquid storage tank of the ethylene glycol refrigerating circulating system, ethylene glycol is input into the fluid exchange tube of the processing box through the evaporator to provide a cold source for the processing box, and after cold and heat exchange is finished, the ethylene glycol is recycled into the evaporator and pumped back to the condenser and then enters the ethylene glycol liquid storage tank, so that the recycling of the cold source is realized.

And the ultrasonic pressurization primary atomization unit comprises a treatment tank, an ultrasonic oscillation plate is arranged in the treatment tank, and the preservative treated by the preservative low-magnetic flux density static magnetic field and the precooling treatment unit is pumped into the treatment tank by a liquid pump to be subjected to primary atomization.

And the air multistage purification system comprises an air purification chamber, wherein a dust removal filter layer, an anion sterilization layer and a photocatalytic harmful gas removal layer are sequentially arranged in the air purification chamber from the air inlet end from outside to inside, and the gas outlet end of the air purification chamber is connected with a nitrogen membrane separation preparation system through a gas shunt pipe.

Moreover, the nitrogen membrane separation preparation system is formed by connecting a plurality of membrane separation tubes in parallel, the length of the membrane separation tube is 20-40cm, the diameter of the membrane separation tube is 4cm, the nitrogen flow is 50-100m3/h, the pressure is 0.1-0.3Mpa, and the purity of the prepared nitrogen is 99.9-99.999%.

And the pure nitrogen pressurizing unit is connected to the gas outlet end of the nitrogen membrane separation preparation system, the gas outlet end of the pure nitrogen pressurizing unit is connected with the high-pressure pure nitrogen storage and control unit, the system comprises a nitrogen storage tank, and the nitrogen storage tank pumps nitrogen in the nitrogen storage tank into the gas-liquid two-phase secondary atomization unit through a pressurization air pump.

And the gas-liquid two-phase two-stage atomization unit comprises a gas-liquid mixing tank, an atomization nozzle is arranged at the front end of the gas-liquid mixing tank, and the high-voltage electrostatic field nanometer three-stage atomization unit is arranged on two sides of the atomization nozzle.

And the high-voltage electrostatic field nanometer three-level atomizing unit comprises a high-voltage electrostatic anode and a high-voltage electrostatic cathode, the anode and the cathode are respectively connected with the anode and the cathode of the power supply, and the high-voltage electrostatic field nanometer three-level atomizing unit is controlled by a high-voltage electrostatic control box.

The utility model has the advantages that:

1. the utility model discloses a precooling pretreatment antistaling agent in synergy of static magnetic field, with the help of the intervention effect of static magnetic field to microorganism cell activity, cell proliferation, intracellular ion concentration and cell morphology, disinfect in synergy. The low-temperature precooling treatment of the preservative reduces the temperature difference between atomized liquid drops and the temperature in the refrigerator, greatly reduces the condensation phenomenon, and solves the problems of the temperature rise of the refrigerator and the condensation of the atomized liquid drops generated by the ultrasonic humidification of the traditional refrigerator. After the water molecules are treated by the magnetic field, hydrogen bonds are weakened, and the water molecules are easier to be atomized into liquid drops with smaller particle sizes.

2. The utility model discloses an ultrasonic oscillation one-level atomizing in the pressure vessel, pure clean nitrogen gas flow second grade atomizing, the tertiary atomizing of high-voltage electrostatic field has prepared the atomized particles that average particle diameter is 40nm, and nanometer particle accounts for than 80%, and effective holding time reaches 1.2 h.

3. The utility model discloses utilize air multistage clean system and nitrogen gas membrane separation preparation system preparation nitrogen gas's air at first to purify and bacterial treatment, effectively get rid of microorganisms such as dust, bacterium, fungi and harmful metabolites such as alcohols, aldehydes, ethylene of fresh-keeping environment.

4. The utility model discloses a high-pressure pure nitrogen gas is stored and is realized the function of pure nitrogen gas as atomization plant's air supply with the control unit, pure nitrogen gas pressurizing unit, not only can be effectively antibacterial, can provide a low oxygen environment for the disinfection environment in addition, and gas is favorable to the fruit vegetables to be preserved in storage to the effect of mechanical gas regulation.

5. The utility model has the advantages of being scientific and reasonable in design, it is high-efficient to use, with the synergistic precooling processing technique of antistaling agent low flux density magnetostatic field, the tertiary atomizing technique of static pressure ionization and air multistage purification and miniature membrane nitrogen making technique are united in the joint of supersound high pressure spraying, can realize chlorine dioxide, peracetic acid, hydrogen peroxide, 10 multiple botanical sources such as plant essential oil and organic acid and the nanometer atomizing antibacterial effect of green chemistry bacteriostat, improve the novel high-efficient safe use of food level bacteriostat, be applicable to different grade type fruit vegetables and alternate use and avoid the pathogenic bacteria drug resistance, can industrialize and be applied to fruit vegetables and store the transportation and sell fresh-keeping.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a diagram showing the atomization effect of hydrogen peroxide under high-voltage electrostatic technology.

Detailed Description

The present invention will be described in further detail with reference to specific examples, which are provided for illustrative purposes only, and are not intended to be limiting, and the scope of the present invention should not be limited thereby.

A multi-field coupling preservative and fresh-keeping system suitable for micro-environment regulation and control of fruit and vegetable storage and transportation is shown in figure 1 and comprises a preservative dispensing unit, a preservative low-flux density static magnetic field collaborative pre-cooling processing unit, an ultrasonic pressurization first-stage atomization unit, a gas-liquid two-phase second-stage atomization unit, a high-voltage electrostatic field nanometer third-stage atomization unit, a high-voltage pure nitrogen storage and control unit, a pure nitrogen pressurization unit, a nitrogen membrane separation preparation system and an air multi-stage purification unit.

The preservative outlet of the preservative dispensing unit is connected with the preservative inlet of the preservative low-magnetic flux density static magnetic field collaborative pre-cooling treatment unit, the preservative outlet of the preservative low-magnetic flux density static magnetic field collaborative pre-cooling treatment unit is connected with the ultrasonic pressurization primary atomization unit, the gas outlet of the air multistage purification system is connected with the gas inlet of the nitrogen membrane separation preparation system, the nitrogen outlet of the nitrogen membrane separation preparation system is communicated to the nitrogen inlet of the pure nitrogen pressurization unit, the nitrogen outlet of the pure nitrogen pressurization unit is connected with the high-pressure pure nitrogen storage and control unit, the ultrasonic pressurization primary atomization unit and the high-pressure pure nitrogen storage and control unit are communicated to the gas-liquid two-phase secondary atomization unit through the pressurization air pump 3, and the outlet end of the gas-liquid two-phase secondary atomization unit is connected with the high-pressure nano electrostatic field three-stage atomization unit.

The fresh-keeping agent dispensing unit comprises a plurality of unit liquid dispensing tanks 14 which are connected with a liquid mixing tank 15 through liquid pumps, the fresh-keeping agent low magnetic flux density static magnetic field collaborative precooling processing unit comprises a processing box 21, a static magnetic field coil 23 is arranged outside the processing box, a magnetic field generator of the magnetic field coil comprises Helmholtz coils (the inner diameter is 400mm, the outer diameter is 450mm, the distance is 200 mm, the thickness is 50-60mm, the number of turns is 500 mm, the power supply of the static magnetic field (the voltage range is 0-80V, the current range is 0-5A) and a gaussmeter (the precision is +/-0.1 percent and the measuring range is 0-200Gs), the magnetic field generator controls the magnetic flux density within the range of 0-95Gs through adjustment, a magnetic field sound insulation box 24 is arranged outside the static magnetic field coil, and the processing box is connected with an external cold water circulating system, the cold water circulating system is externally connected with an ethylene glycol refrigerating circulating system, and the outlet end of the liquid mixing tank is extended and connected into the treatment tank.

The cold water circulating system comprises an evaporator 18 which is externally connected with a condenser 16 and a glycol liquid storage tank 17 of the glycol refrigerating circulating system. The ethylene glycol is input into the fluid exchange tube of the processing box through the evaporator to provide a cold source for the processing box, and after the cold-heat exchange is finished, the ethylene glycol is recycled into the evaporator and pumped back into the condenser and then enters the ethylene glycol liquid storage tank, so that the recycling of the cold source is realized.

The treatment chamber is controlled by a control system 19 which is connected to a magnetic field strength sensor 22 and a temperature sensor 20, which are arranged in the treatment chamber.

The refrigeration cycle system takes glycol solution as a refrigerant, a magnetic field intensity sensor and a temperature sensor are arranged in the processing box, and can respectively transmit temperature and magnetic field intensity signals to the control system for real-time monitoring.

The ultrasonic pressurization primary atomization unit comprises a treatment tank 26, an ultrasonic oscillation plate 25 is arranged in the treatment tank, and the preservative treated by the preservative low-magnetic flux density static magnetic field and the precooling treatment unit is pumped into the treatment tank through a liquid pump to be subjected to primary atomization.

The air multi-stage purification systemIncluding air purification room 9, from air inlet end outside-in this air purification room, set gradually dust removal filter layer 12, anion sterilization layer 11 photocatalysis and remove harmful gas layer 10, air purification room's gas outlet end passes through gas shunt tubes 8 and connects nitrogen gas membrane separation preparation system 6, nitrogen gas membrane separation preparation system comprises a plurality of membrane separation pipes 7, and membrane separation pipe length 20-40cm, diameter 4cm, nitrogen gas flow 50-100m³The pressure is 0.1-0.3Mpa, and the purity of the prepared nitrogen is 99.9-99.999%.

The novel composite filter material is prepared by adopting an HEPA (high efficiency air filter) filter screen as a dust removal filter layer, wherein the effective purification rate of fine air particles with the particle size of 0.1 mu m reaches 99.97%, the HEPA filter screen takes a traditional polyester non-woven fabric as a substrate, and a layer of ultrathin nanofiber membrane (the fiber membrane spinning solution is composed of 10% chitosan, 80% polyvinyl alcohol and 10% gallic acid, and the electrostatic spinning method is that a roller type collector is controlled at 41rpm, the sample injection flow rate is 0.5mL/h, the vertical distance from a sample injection needle to the collector is 15 cm., the appearance size of a stainless steel needle head of a connecting injector is 0.7mm multiplied by 32mm, and the diameter is 0.390mm) is compounded on the HEPA filter screen.

The negative ion sterilization layer is mainly composed of a negative ion generator, the generator inputs voltage DC12V, outputs high voltage of-10000V +/-1000V, has power of 2W and has negative ion concentration of 20 multiplied by 106PCS/CM 3.

A photocatalytic harmful gas removal layer mainly made of TiO₂The photocatalytic hydroxyl reactor structure can stably generate purification factors (active functional groups such as hydroxyl free radicals, negative oxygen ions and the like) under the action and control of broad-spectrum ultraviolet rays (360nm) and a TiO2 metal catalyst, can kill bacteria, viruses and molds in the air in a short time and can decompose VOC (volatile organic compounds) gas and peculiar smell, and has the power of 6W, the voltage of 220V and TiO₂The nano coating is realized by hydrophilic inorganic titanium dioxide sol, the titanium content is 8-10%, the particle size of the sol is 10-40nm, the PH is 7-8, and the nano coating is sprayed on a die by adopting ultrasonic spraying equipment, wherein the spraying temperature is 300-500 ℃.

The system comprises a nitrogen gas storage tank 4, and the nitrogen gas storage tank pumps nitrogen gas in the nitrogen gas storage tank into a gas-liquid two-phase secondary atomization unit through a pressurization air pump.

The gas-liquid two-phase two-stage atomization unit comprises a gas-liquid mixing tank 27, an atomization nozzle 30 is arranged at the front end of the gas-liquid mixing tank, the high-voltage electrostatic field nanometer three-stage atomization unit is arranged on two sides of the atomization nozzle, the high-voltage electrostatic field nanometer three-stage atomization unit comprises a high-voltage electrostatic anode 1 and a high-voltage electrostatic cathode 29, the anode and the cathode are respectively connected with an anode and a cathode of a power supply 28, and the high-voltage electrostatic field nanometer three-stage atomization unit is controlled by a high-voltage electrostatic control box 2.

The utility model discloses a theory of operation:

firstly, the preservative is subjected to low magnetic flux density static magnetic field synergistic precooling treatment to enhance sterilization capability and prevent condensation and is easier to atomize

At present, humidifying equipment for a refrigeration house is usually an ultrasonic humidifier, water used by the humidifier is normal-temperature water, the particle size of fog drops of the ultrasonic humidifier is about 10-30 microns, the temperature of the refrigeration house for fruits and vegetables is mostly-1-0 ℃, the phenomenon that the fog drops are condensed on the surfaces of the fruits and vegetables in the using process often occurs, so that microorganisms can be bred in the water on the surfaces of the fruits and vegetables, fruit rot is aggravated, and the humidification process of normal-temperature water atomization can lead to the temperature rise of the refrigeration house and increase energy consumption.

The utility model discloses a mode of the mixed solution of antistaling agent that will dispose precooling in the magnetic field, on the one hand, with the help of the synergistic effect of magnetostatic field to the antistaling agent, improve bactericidal effect. The static magnetic field has obvious influence on the cell activity, cell proliferation, intracellular ion concentration and cell morphology of the microorganism, the static magnetic field can interfere the normal cell death process of the magnetic field, and the intracellular calcium concentration is increased, for example, the magnetic field can inhibit the growth of escherichia coli and inhibit the cell activity of the escherichia coli. The static magnetic field treatment has an inhibiting effect on pathogenic bacteria on the surfaces of the fruits and vegetables, and can effectively inhibit decay. On the other hand, the preservative is firstly treated at low temperature to control the temperature of the preservative to be 2-4 ℃, and then atomized, so that the temperature difference between atomized liquid drops and the temperature in the refrigeration house can be greatly reduced, the condensation phenomenon can be greatly reduced, and the problems of storage temperature rise and atomized liquid drop condensation caused by ultrasonic humidification of the traditional refrigeration house are solved. In addition, after the water molecules are treated by the magnetic field, hydrogen bonds are weakened, and the water molecules are easier to atomize into liquid drops with smaller particle sizes.

According to the use requirements, different types of preservatives are automatically proportioned and uniformly mixed according to the concentration (43-46), and then the mixture enters a static magnetic field pre-cooling chamber of the preservatives. The precooling temperature is controlled to be 2-4 ℃, the magnetic field intensity is 70-80Gs, and the precooling processing time is 40-60min under the cooperation of the magnetic field.

The functions are completed by the antistaling agent dispensing unit, the antistaling agent low magnetic flux density static magnetic field and the precooling processing unit.

Two, ultrasonic high pressure spray combined static pressure ionization three-stage atomization technology

In order to realize the nanometer atomization effect, the utility model discloses earlier adopt supersound pressurization one-level atomizing unit to become 10-30 μm's fog drops with low temperature antistaling agent supersound one-level atomizing, then the atomizing liquid drop transports gas-liquid double-phase second grade atomizing unit, antistaling agent liquid pressure scope through the flow pump: 0.1-0.2Mpa, further broken up by the fog drop through the high pressure nitrogen, the nitrogen is used as its gas power, the atmospheric pressure range: 0.2-0.5Mpa, nitrogen flow: 0.15-0.2m³And h, carrying out secondary atomization on the preservative, wherein dry fog particles with the particle size of 1-5 microns are sprayed by an atomizing nozzle. Wherein, 10-head atomization is adopted by the ultrasonic oscillator, the working voltage DC45 +/-3V, the power is 250W, the working current is 5.5 +/-0.3A, the fogging amount is 7-8kg/h, and the filter capacitance is as follows: 3300UF/63V, blower air quantity 40.5 CFM. The ultrasonic atomization pressure cooker adopts a 50L horizontal pressure tank, the pressure bearing capacity is less than or equal to 1.5MPA, the aperture of a nozzle is 1-2 mu m, and the pressure resistance is 6 bar.

The sprayed dry fog particles enter a high-voltage electrostatic field nanometer three-stage atomizing unit, are further ionized into low-temperature nano particles under the action of a high-voltage electrostatic field, are atomized for the third stage, the average diameter of the atomized particles is about 40nm, the size of the atomized particles can determine the stability of liquid drops, the surface of the nano liquid drops is charged to enable the nano liquid drops to be more stable, the penetration capacity is stronger, the antistaling agent can more fully enter grooves, skin holes, air holes, peduncles and other parts of the surface of fruits and vegetables, and the sterilization effect is greatly increased.

The high-voltage electrostatic technology enables the surface of a liquid medium to distribute charges to form a charged fog drop group, the charged fog drops have the characteristics of small particle size, concentrated size range, wide space dispersion, monodispersity and the like, the electrostatic field plays an important role in a jet atomization process, and particularly has an obvious effect on the aspect of homogenizing and refining the fog drops. The surface adsorption force and the surface activity of the charged droplets are increased under the action of an electrostatic field, so that the surface tension is reduced, the liquid crushing and atomizing resistance is reduced, the kinetic energy of the droplets is changed, and the droplets are more easily crushed. The electrostatic field voltage is 35-40KV, the diameter of the atomizing electrode is 6-8mm, and the discharge interval is 40-50 mm. Taking an atomized 7% hydrogen peroxide solution as an example, the size distribution of hydrogen peroxide droplets in the treatment vessel was measured 2 times, and the measurement immediately after the treatment was the 1 st measurement, and the 2 nd measurement was carried out 80 minutes after the treatment.

As shown in FIG. 2, the nano-sized droplets are first size dispersed and then appear in a lognormal distribution with an average diameter of about 40nm, the size distribution of the droplets in the nano-range is 3-120nm, and the total number of droplets is about 84164/mL, accounting for 80%. And in the micrometer range, its average diameter is about 0.8 μm, the droplet size distribution is 0.2-2 μm, and the total droplet number is about 4390/mL. While in the second measurement approximately 18% of the nano-sized droplets remained in the treatment vessel.

Three, air multi-stage purification and micro-membrane nitrogen making technology

Air 13 for preparing nitrogen enters an air multi-stage purification system, and is purified and sterilized firstly, and the purification system sequentially comprises a dust removal filter layer, an anion sterilization layer and a photocatalytic harmful gas removal layer from outside to inside. After three-layer filtering, sterilizing and peculiar smell removing, the harmful metabolites such as alcohols, aldehydes, ethylene and the like of microorganisms such as dust, bacteria, fungi and the like in the fruit and vegetable fresh-keeping environment can be effectively removed, purified air enters a micro nitrogen membrane separation tube through an air compressor after being purified, the length of the membrane separation tube is 20-40cm, the diameter of the membrane separation tube is 4cm, the nitrogen flow is 50-100m3/h, the pressure is 0.1-0.3Mpa, and the purity of the prepared nitrogen is 99.9-99.999%. Pure nitrogen is used as an air source of the atomization equipment, so that the bacteria can be effectively inhibited, a low-oxygen environment can be provided for the sterilization environment, and the air is in mechanical air conditioning effect, thereby being beneficial to the storage and fresh keeping of fruits and vegetables.

Membrane separation tubes utilize the principle of selective permeation to produce high purity nitrogen. The various gas components dissolve and diffuse in the membrane, forming their own specific permeation rates. Oxygen, which is a fast gas, dissolves quickly through the membrane wall while nitrogen still flows along the lumen of the filaments to form a nitrogen-rich stream. The oxygen-rich gas stream permeates out of the membrane at atmospheric pressure and is vented. The separation driving force is the partial pressure difference formed between the gas components in the membrane and the outer cavity. While most of the slow gas and a small amount of the fast gas continue to flow along the tube side to the other end of the membrane module to be utilized as product nitrogen.

The technology is realized by an air multistage purification system, a high-pressure pure nitrogen storage and control unit, a pure nitrogen pressurization unit and a nitrogen membrane separation preparation system.

The utility model discloses experimental study is carried out to equipment, and atomizing hydrogen peroxide is to the tomato, and the influence of primary colony on spinach and the Hami melon, through the survey, and untreated cherry tomato total colony number and yeast and mould number are 5.94 +/-0.54 CFU/fruit and 6.05 +/-2.15 log CFU/fruit respectively, as table 1, untreated Hami melon's primary total colony number, yeast and mould number are 5.19 +/-0.48 log CFU/pieces and 5.46 +/-0.70 log CFU/pieces respectively. The total colony count of the native, yeast and mold count of untreated spinach leaf was 5.95. + -. 0.71log CFU/piece and 6.40. + -. 0.74log CFU/piece, respectively.

The atomized hydrogen peroxide significantly reduced the number of original total colonies on the epidermis of cherry tomato, spinach leaves and cantaloupe, with the inhibition amounts of 1.57log CFU/g, 1.23log CFU/g and 1.62log CFU/g, respectively. Also, yeast and mold were significantly inhibited, 3.90log CFU/g, 2.24log CFU/g, and 2.75log CFU/g, respectively. The atomized hydrogen peroxide treatment was more effective in inhibiting yeast and mold than total colonies, and the specific experimental data are shown in table 1.

TABLE 1 Total Primary colony of cherry tomato, spinach and cantaloupe, Yeast and mold number (Log CFU/g) after treatment with atomized hydrogen peroxide

Data a are expressed as mean ± standard deviation of replicates (n-8).

b in the same column, data with the same letter suffix indicates no significant difference between the data (p > 0.05).

Although the embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that: various substitutions, changes and modifications are possible without departing from the spirit and scope of the invention and the appended claims, and therefore, the scope of the invention is not limited to the embodiments disclosed.

Claims (9)

1. A multi-field coupling antiseptic fresh-keeping system suitable for fruit and vegetable storage and transportation microenvironment regulation is characterized in that: the fresh-keeping agent dispensing device comprises a fresh-keeping agent dispensing unit, a fresh-keeping agent low magnetic flux density static magnetic field collaborative pre-cooling processing unit, an ultrasonic pressurization first-stage atomization unit, a gas-liquid two-phase second-stage atomization unit, a high-voltage electrostatic field nanometer third-stage atomization unit, a high-voltage pure nitrogen storage and control unit, a pure nitrogen pressurization unit, a nitrogen membrane separation preparation system and an air multistage purification unit, wherein a fresh-keeping agent outlet of the fresh-keeping agent dispensing unit is connected with a fresh-keeping agent inlet of the fresh-keeping agent low magnetic flux density static magnetic field collaborative pre-cooling processing unit, an outlet of the fresh-keeping agent low magnetic flux density static magnetic field collaborative pre-cooling processing unit is connected with the ultrasonic pressurization first-stage atomization unit, a gas outlet of the air multistage purification system is connected with a gas inlet of a nitrogen membrane separation preparation system, a nitrogen outlet of the nitrogen membrane separation preparation system is communicated with a nitrogen inlet of the pure nitrogen pressurization unit, and a nitrogen outlet of the pure nitrogen pressurization unit is connected with the high-pressure pure nitrogen storage and control unit, the ultrasonic pressurization primary atomization unit and the high-pressure pure nitrogen storage and control unit are communicated to the gas-liquid two-phase secondary atomization unit through a pressurization air pump, and the outlet end of the gas-liquid two-phase secondary atomization unit is connected with the high-pressure electrostatic field nanometer three-level atomization unit.

2. The multi-field coupling corrosion prevention and preservation system suitable for fruit and vegetable storage and transportation microenvironment regulation and control of claim 1, wherein: the preservative dispensing unit comprises a plurality of unit liquid dispensing tanks connected with the liquid mixing tanks through liquid pumps, the preservative low-magnetic-flux-density static magnetic field collaborative precooling processing unit comprises a processing box, a static magnetic field coil is arranged outside the processing box, a magnetic field sound insulation box is arranged outside the static magnetic field coil, the processing box is connected with an external cold water circulating system, the cold water circulating system is externally connected with an ethylene glycol refrigerating circulating system, and the outlet end of the liquid mixing tank is connected into the processing box in an extending mode.

3. The multi-field coupling corrosion prevention and preservation system suitable for fruit and vegetable storage and transportation microenvironment regulation and control of claim 2, wherein: the cold water circulating system comprises an evaporator, the evaporator is externally connected with a condenser and an ethylene glycol liquid storage tank of the ethylene glycol refrigerating circulating system, ethylene glycol is input into a fluid exchange tube of the processing box through the evaporator to provide a cold source for the processing box, and after cold and heat exchange is completed, the ethylene glycol is recycled into the evaporator and pumped back to the condenser and then enters the ethylene glycol liquid storage tank, so that the cold source is recycled.

4. The multi-field coupling corrosion prevention and preservation system suitable for fruit and vegetable storage and transportation microenvironment regulation and control of claim 1, wherein: the ultrasonic pressurization primary atomization unit comprises a treatment tank, an ultrasonic oscillation plate is arranged in the treatment tank, and the preservative treated by the preservative low-magnetic flux density static magnetic field and the precooling treatment unit is pumped into the treatment tank through a liquid pump to be subjected to primary atomization.

5. The multi-field coupling corrosion prevention and preservation system suitable for fruit and vegetable storage and transportation microenvironment regulation and control of claim 1, wherein: the air multistage purification system comprises an air purification chamber, wherein a dust removal filter layer, an anion sterilization layer and a photocatalytic harmful gas removal layer are sequentially arranged in the air purification chamber from the air inlet end from outside to inside, and the gas outlet end of the air purification chamber is connected with a nitrogen membrane separation preparation system through a gas shunt pipe.

6. The multi-field coupling preservative and fresh-keeping system suitable for fruit and vegetable storage and transportation microenvironment regulation and control of claim 1 or 5, wherein the multi-field coupling preservative and fresh-keeping system comprises: the nitrogen membrane separation preparation system is formed by connecting a plurality of membrane separation tubes in parallel, wherein the length of each membrane separation tube is 20-40cm, the diameter of each membrane separation tube is 4cm, the nitrogen flow is 50-100m3/h, the pressure is 0.1-0.3Mpa, and the purity of prepared nitrogen is 99.9-99.999%.

7. The multi-field coupling corrosion prevention and preservation system suitable for fruit and vegetable storage and transportation microenvironment regulation and control of claim 1, wherein: the system comprises a nitrogen gas storage tank, and the nitrogen gas storage tank pumps nitrogen gas in the nitrogen gas storage tank into a gas-liquid two-phase secondary atomization unit through a pressurization air pump.

8. The multi-field coupling corrosion prevention and preservation system suitable for fruit and vegetable storage and transportation microenvironment regulation and control of claim 1, wherein: the gas-liquid two-phase two-stage atomization unit comprises a gas-liquid mixing tank, an atomization nozzle is arranged at the front end of the gas-liquid mixing tank, and the high-voltage electrostatic field nanometer three-stage atomization units are arranged on two sides of the atomization nozzle.

9. The multi-field coupling corrosion prevention and preservation system suitable for fruit and vegetable storage and transportation microenvironment regulation and control of claim 8, wherein: the high-voltage electrostatic field nanometer three-level atomizing unit comprises a high-voltage electrostatic anode and a high-voltage electrostatic cathode, the anode and the cathode are respectively connected with the anode and the cathode of a power supply, and the high-voltage electrostatic field nanometer three-level atomizing unit is controlled by a high-voltage electrostatic control box.

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