CN118633647A - Enhanced electrostatic field release device - Google Patents

Abstract

The invention discloses an enhanced electrostatic field releasing device, which comprises: an electric field generating power supply having an output terminal thereon; the radiation plate comprises an insulating layer, a discharge layer, an electrostatic field enhancement layer and a water-resistant layer which are sequentially laid, wherein the discharge layer is connected with an output end through wires, and the electrostatic field enhancement layer is made of any one of polycarbonate, polytetrafluoroethylene, carbon fiber and indium tin oxide film sodium calcium-based glass. According to the invention, the electrostatic field enhancement layer made of any one of polycarbonate, polytetrafluoroethylene, carbon fiber and indium tin oxide coated sodium-calcium-based glass is laid on the discharge layer, so that the radiation plate can release high and uniform electrostatic field intensity under low pressure, and the fresh-keeping of fresh meat and other foods is facilitated.

Description

Enhanced electrostatic field release device

Technical Field

The present invention relates to the technical field of fresh agricultural product preservation, and more specifically, to an enhanced electrostatic field release device.

Background Art

Electrostatic field technology is a non-thermal food preservation technology that can control the charge distribution on the surface of agricultural products through electrostatic fields, affect the surface and internal microenvironment, prevent the growth of bacteria and mold, delay the corruption of agricultural products, and improve the quality of agricultural products. The key to the electrostatic field preservation technology is that the electrostatic field generating device can release uniform and high-intensity electrostatic field strength in a certain space. In practical applications, electrostatic field strength is an important parameter, which indicates the electric field force exerted on a unit positive charge and directly affects the effect of electrostatic field preservation application.

At present, the electrostatic field generating device mainly controls the electric field strength by adjusting the output voltage, but there are two problems:

First, in actual electrostatic field preservation applications, the ability of this device to output electrostatic field strength is not clear, and the electrostatic field strength calculated by the formula is not intuitive, and its uniformity cannot be judged;

Second, in order to achieve a higher electric field strength, a high-voltage electrostatic field is usually applied to a radiation plate composed of a copper wire mesh to reduce the loss and preserve the agricultural products. This poses a safety hazard to users, while the output electric field strength is lower than that of the safer low-voltage electrostatic field and cannot meet the needs of reducing loss and preserving agricultural products.

Therefore, there is an urgent need for an enhanced electrostatic field release device to release a high-intensity, uniform, sustainable and safe electrostatic field.

Summary of the invention

An object of the present invention is to solve at least the above problems and to provide at least the advantages which will be described hereinafter.

In order to achieve these purposes and other advantages according to the present invention, an enhanced electrostatic field release device is provided, comprising:

an electric field generating power source having an output terminal;

The radiation plate comprises an insulating layer, a discharge layer, an electrostatic field enhancement layer, and a water-blocking layer which are sequentially laid, wherein the discharge layer is connected to the output end wire, and the material of the electrostatic field enhancement layer comprises any one of polycarbonate, polytetrafluoroethylene, carbon fiber, and indium tin oxide coated soda-lime-based glass.

Preferably, the electrostatic field enhancement layer is made of indium tin oxide coated soda-lime based glass.

Preferably, the insulating layer, the discharge layer, the electrostatic field enhancement layer, and the water-blocking layer are laminated by a high-frequency lamination process to form the radiation plate.

Preferably, the radiation plate is rectangular, and insulating connection frames are provided at its four corners.

Preferably, the thickness of the insulating layer is at least 3 mm, and the material of the insulating layer includes any one of acrylonitrile, butadiene, styrene copolymer, and silicone.

Preferably, the discharge layer comprises a copper mesh layer, the orthographic projection of the discharge layer is located within the range covered by the orthographic projection of the insulating layer, the discharge layer is embedded on the insulating layer, and the thickness of the discharge layer is at least 2 mm.

Preferably, the orthographic projection of the electrostatic field enhancement layer completely covers the discharge layer, and the electrostatic field enhancement layer is at least 2 mm.

Preferably, the material of the water-blocking layer includes propylene copolymer or polyvinyl chloride, the orthographic projection of the water-blocking layer completely covers the electrostatic field enhancement layer, and the thickness of the water-blocking layer is at least 1 mm.

The present invention includes at least the following beneficial effects: by laying an electrostatic field enhancement layer made of any one of polycarbonate, polytetrafluoroethylene, carbon fiber, and indium tin oxide coated soda-lime-based glass on the discharge layer, the radiation plate can release a higher and uniform electrostatic field intensity under low pressure, which helps to preserve fresh meat and other foods.

Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic side view of the structure of the enhanced electrostatic field release device according to one of the technical solutions of the present invention;

FIG2 is an exploded view of the radiation plate according to one technical solution of the present invention;

FIG3 is a schematic diagram of the side structure of the discharge layer according to one technical solution of the present invention;

FIG4 shows the electrostatic field strength of each group of radiation plates at different distances according to one technical solution of the present invention;

FIG5 is a diagram showing the electrostatic field strength of the electrostatic field enhancement layer of different thicknesses in each group of radiation plates according to one technical solution of the present invention;

FIG6 is a schematic diagram of points at different positions of the radiation plate according to one technical solution of the present invention;

FIG7 is a growth curve of microorganisms in fresh meat according to one technical solution of the present invention;

FIG8 is a diagram of microbial cells after 24 hours of exposure to radiation plates in a control group of one of the technical solutions of the present invention;

FIG. 9 is a diagram of microbial cells after 24 hours of exposure to the radiation plate in Example 4 of one of the technical solutions of the present invention.

The markings in Figures 1 to 3 are as follows:

An electric field generating power source 1, an output terminal 2, a radiation plate 3, an insulating layer 4, a discharge layer 5, an electrostatic field enhancement layer 6, a water-blocking layer 7, and an insulating connection frame 8.

DETAILED DESCRIPTION

The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the orientation or positional relationship indicated by the terms is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

As shown in FIGS. 1 to 3 , the present invention provides an enhanced electrostatic field release device, comprising:

An electric field generating power source 1 having an output terminal 2; specifically, the electric field generating power source 1 can continuously transmit a voltage with a constant frequency and equal amplitude to the radiation plate 3 described below, the voltage output by the electric field generating power source 1 can be adjusted according to the size of the electrostatic field radiation plate 3 and the conductivity of the discharge layer 5 described below, the operating frequency range of the electric field generating power source 1 is at least 50-60 Hz, the output voltage range is at least 0-50 kV, the output current range is at least 0-5 mA, and the output power range is at least 30-150 W;

The radiation plate 3 includes an insulating layer 4, a discharge layer 5, an electrostatic field enhancement layer 6, and a water-blocking layer 7 which are sequentially laid, wherein the discharge layer 5 is connected to the output end 2 by wires, and the material of the electrostatic field enhancement layer 6 includes any one of polycarbonate, polytetrafluoroethylene, carbon fiber, and indium tin oxide coated soda-lime-based glass; specifically, the discharge layer 5 can be a copper wire mesh or other metal mesh, which is used to connect to the output end 2 for electrical conduction, thereby discharging and obtaining electrons that move freely in the discharge layer 5, the insulating layer 4 prevents the discharge layer 5 from contacting the human body and causing accidents such as electric shock, and the electrostatic field enhancement layer 6 can The material used for the electrostatic field enhancement layer 6 is laminated on one side of the discharge layer 5 through a high-frequency lamination process, and can conduct electricity to receive the discharge of the discharge layer 5 and significantly enhance the electrostatic field strength, so that the radiation plate 3 can release a high and uniform electrostatic field strength under a safe voltage (low voltage), which is helpful for preserving fresh meat and other foods; the material of the water-blocking layer 7 can be propylene copolymer or polyvinyl chloride, which has both insulating and waterproof properties, preventing moisture in the food placed on the water-blocking layer 7 from penetrating into the electrostatic field enhancement layer 6 and even the discharge layer 5, thereby preventing accidents such as leakage and electric shock.

In the above technical solution, the insulating layer 4, the discharge layer 5, the electrostatic field enhancement layer 6, and the water-blocking layer 7 are pressed together through a high-frequency pressing process to form the radiation plate 3, and the discharge layer 5 is connected to the output end 2 of the electric field generating power supply 1 through an electric wire. The electric field generating power supply 1 is turned on and its output voltage is adjusted. The voltage output by the electric field generating power supply 1 is transmitted to the discharge layer 5 for discharge to generate free charges, which are then conducted to the electrostatic field enhancement layer 6. The electrostatic field enhancement layer 6 enhances the released electrostatic field strength, so that the radiation plate 3 can release a higher and uniform electrostatic field strength under low voltage, which is helpful for preserving fresh meat and other foods. When there are multiple radiation plates 3, multiple radiation plates 3 can be arranged in series through electric wires (the discharge layers 5 in multiple radiation plates 3 are connected in series through electric wires).

In another technical solution, the material of the electrostatic field enhancement layer 6 is indium tin oxide coated soda-lime-based glass; specifically, when the material of the electrostatic field enhancement layer 6 is indium tin oxide coated soda-lime-based glass, the electrostatic field intensity released by the radiation plate 3 is the highest, and its thickness has no hindering effect on the release of the electrostatic field intensity of the radiation plate 3.

In another technical solution, the insulating layer 4, the discharge layer 5, the electrostatic field enhancement layer 6, and the water-blocking layer 7 are pressed together through a high-frequency pressing process to form the radiation plate 3; specifically, the insulating layer 4, the discharge layer 5, the electrostatic field enhancement layer 6, and the water-blocking layer 7 are pressed together through a high-frequency pressing process, and have high compactness and are not easy to fall apart.

In another technical solution, the radiation plate 3 is rectangular, and an insulating connection frame 8 is provided at each of its four corners; specifically, the material of the insulating connection frame 8 may be propylene copolymer, and may be fixed to the four corners of the radiation plate 3 by bonding. The insulating connection frame 8 is used to protect the edge of the radiation plate 3 from curling, and may also help prevent the radiation plate 3 from leaking electricity. The insulating connection frame 8 may extend to surround the radiation plate 3.

In another technical solution, the thickness of the insulating layer 4 is at least 3 mm, and the material of the insulating layer 4 includes any one of acrylonitrile, butadiene, styrene copolymer, and silicone; specifically, the material and thickness of the insulating layer 4 can effectively protect the discharge layer 5 and prevent it from contacting the human body and causing leakage, electric shock, etc.

In another technical solution, the discharge layer 5 includes a copper mesh layer, the orthographic projection of the discharge layer 5 is located within the range covered by the orthographic projection of the insulating layer 4, the discharge layer 5 is embedded in the insulating layer 4, and the thickness of the discharge layer 5 is at least 2 mm; specifically, the copper mesh layer can fully discharge under the action of the output end 2 of the electric field generating power supply 1 to generate mobile charges, and the size of the discharge layer 5 is smaller than that of the insulating layer 4, so that the insulating layer 4 can better protect the discharge layer 5 from leakage and the like.

In another technical solution, the orthographic projection of the electrostatic field enhancement layer 6 completely covers the discharge layer 5, and the electrostatic field enhancement layer 6 is at least 2 mm; specifically, the size of the electrostatic field enhancement layer 6 enables the mobile charges of the discharge layer 5 to be completely transported to the electrostatic field enhancement layer 6.

In another technical solution, the material of the water-blocking layer 7 includes propylene copolymer or polyvinyl chloride, the orthographic projection of the water-blocking layer 7 completely covers the electrostatic field enhancement layer 6, and the thickness of the water-blocking layer 7 is at least 1 mm; specifically, the water-blocking layer 7 has both insulating and waterproof properties, preventing moisture in the food placed on the water-blocking layer 7 from penetrating into the electrostatic field enhancement layer 6 and even into the discharge layer 5, thereby preventing accidents such as leakage and electric shock. The size of the water-blocking layer 7 is equal to that of the insulating layer 4, so that the insulating layer 4 and the water-blocking layer 7 can completely cover the discharge layer 5 and the electrostatic field enhancement layer 6 to prevent leakage and the like.

<Example 1>

Enhanced electrostatic field release device, including:

an electric field generating power source having an output terminal;

A radiation plate, comprising a 3 mm thick insulation layer, a 2 mm thick discharge layer, a 2 mm thick electrostatic field enhancement layer, and a 2 mm thick water-blocking layer laminated by a high-frequency lamination process, wherein the area of the insulation layer and the water-blocking layer is 400×350 mm, the discharge layer is connected to the output end wire, the electrostatic field enhancement layer is made of polycarbonate, the insulation layer is made of acrylonitrile, the discharge layer is a copper wire mesh layer, the water-blocking layer is made of propylene copolymer, and insulating connection frames are provided at the four corners of the radiation plate.

<Example 2>

Enhanced electrostatic field release device, including:

an electric field generating power source having an output terminal;

A radiation plate, comprising a 3 mm thick insulation layer, a 2 mm thick discharge layer, a 2 mm thick electrostatic field enhancement layer, and a 2 mm thick water-blocking layer laminated by a high-frequency lamination process, wherein the area of the insulation layer and the water-blocking layer is 400×350 mm, the discharge layer is connected to the output end wire, the electrostatic field enhancement layer is made of polytetrafluoroethylene, the insulation layer is made of acrylonitrile, the discharge layer is a copper wire mesh layer, the water-blocking layer is made of propylene copolymer, and insulating connection frames are provided at the four corners of the radiation plate.

<Example 3>

Enhanced electrostatic field release device, including:

an electric field generating power source having an output terminal;

A radiation plate, comprising a 3 mm thick insulation layer, a 2 mm thick discharge layer, a 2 mm thick electrostatic field enhancement layer, and a 2 mm thick water-blocking layer laminated by a high-frequency lamination process, wherein the area of the insulation layer and the water-blocking layer is 400×350 mm, the discharge layer is connected to the output end wire, the electrostatic field enhancement layer is made of carbon fiber, the insulation layer is made of acrylonitrile, the discharge layer is a copper wire mesh layer, the water-blocking layer is made of propylene copolymer, and insulating connection frames are provided at the four corners of the radiation plate.

<Example 4>

Enhanced electrostatic field release device, including:

an electric field generating power source having an output terminal;

A radiation plate, comprising a 3 mm thick insulation layer, a 2 mm thick discharge layer, a 2 mm thick electrostatic field enhancement layer, and a 2 mm thick water-blocking layer laminated by a high-frequency lamination process, wherein the area of the insulation layer and the water-blocking layer is 400×350 mm, the discharge layer is connected to the output end wire, the electrostatic field enhancement layer is made of indium tin oxide coated soda-lime-based glass, the insulation layer is made of acrylonitrile, the discharge layer is a copper wire mesh layer, the water-blocking layer is made of propylene copolymer, and insulating connection frames are provided at the four corners of the radiation plate.

<Control group>

Enhanced electrostatic field release device, including:

an electric field generating power source having an output terminal;

A radiation plate, comprising a 3 mm thick insulation layer, a 4 mm thick discharge layer, and a 2 mm thick water-blocking layer laminated by a high-frequency lamination process, wherein the area of the insulation layer and the water-blocking layer is 400×350 mm, the discharge layer is connected to the output end wire, the insulation layer is made of acrylonitrile, the discharge layer is a copper wire mesh layer, the water-blocking layer is made of propylene copolymer, and insulating connection frames are provided at the four corners of the radiation plate.

1.1 Effect of electrostatic field enhancement layers of different materials on the release of electrostatic field intensity

The electric field generating power supply of each group was turned on and its constant output voltage was adjusted to 4 kV. The electrostatic field strength at 5 cm, 10 cm, 15 cm, 20 cm and 25 cm away from the water-blocking layer in each group of radiation plates was measured to determine the attenuation of the electrostatic field strength with the action distance, as shown in Figure 4 below. In order to more clearly analyze the electrostatic field strength released by each group of radiation plates, the electrostatic field strength at 10 cm away from the radiation plates is tabulated and displayed, as shown in Table 1 below:

Table 1 Electrostatic field strength of each group at 10 cm from the radiation plate

Group Electrostatic field strength (V/cm) Example 1 3750.00±246.67 Example 2 3038.14±415.11 Example 3 2507.83±419.73 Example 4 4690.10±280.19 Control group 2155.86±73.32

According to FIG. 4 , it can be seen that, taking the decrease in the electrostatic field intensity as the standard, when the measuring distance exceeds 10 cm, the electrostatic field intensity of the control group and Example 3 decreases, when the measuring distance exceeds 15 cm, the electrostatic field intensity of Example 1 and Example 2 decreases, and when the measuring distance exceeds 20 cm, the electrostatic field intensity of Example 4 decreases; taking the electrostatic field intensity value dropping to 0 V/cm as the standard, the maximum effective action distance of the radiation plates of Examples 1 to 4 is 20 cm.

According to the data in Table 1, compared with the control group, the radiation plates prepared in Examples 1 to 4 have significantly increased the intensity of the released electrostatic field when the voltage output by the electric field generating power supply is the same. Among them, the reinforcing ability of the soda-lime-based glass coated with indium tin oxide is the strongest, which is more than twice that of the control group. The reason is that the soda-lime-based glass coated with indium tin oxide enhances the conversion between bound charges and free charges. There are more active charges in the electric field in space, and the electrostatic field forms an electric field in space mainly through the conversion and action between bound charges and free charges. Therefore, the soda-lime-based glass coated with indium tin oxide significantly improves the electrostatic field intensity.

<Comparative Example 1>

The other structures are the same as those in Example 1, except that the thickness of the electrostatic field enhancement layer is changed to 4 cm.

<Comparative Example 2>

The other structures are the same as those in Example 1, except that the thickness of the electrostatic field enhancement layer is changed to 6 cm.

<Comparative Example 3>

The other structures are the same as those in Example 2, except that the thickness of the electrostatic field enhancement layer is changed to 4 cm.

<Comparative Example 4>

The other structures are the same as those in Example 2, except that the thickness of the electrostatic field enhancement layer is changed to 6 cm.

<Comparative Example 5>

The other structures are the same as those in Example 3, except that the thickness of the electrostatic field enhancement layer is changed to 4 cm.

<Comparative Example 6>

The other structures are the same as those in Example 3, except that the thickness of the electrostatic field enhancement layer is changed to 6 cm.

<Comparative Example 7>

The other structures are the same as those in Example 4, except that the thickness of the electrostatic field enhancement layer is changed to 4 cm.

<Comparative Example 8>

The other structures are the same as those in Example 4, except that the thickness of the electrostatic field enhancement layer is changed to 6 cm.

1.2 Effect of electrostatic field enhancement layers of different thicknesses on the release of electrostatic field intensity

The electric field generating power supplies of each group of Examples 1 to 4 and Comparative Examples 1 to 8 were turned on and the constant output voltage was adjusted to 4 kV. The electrostatic field intensity at a distance of 10 cm from the water blocking layer in each group of radiation plates was measured, as shown in FIG5 .

According to the data in Figure 5, when polytetrafluoroethylene and indium tin oxide coated soda-lime-based glass are used as electrostatic field enhancement layer materials, their stacking thickness has no significant effect on the intensity release of the electrostatic field, while when the stacking thickness of polycarbonate and carbon fiber reaches 6 mm, it has a significant hindering effect on the intensity release of the electrostatic field.

1.3 Uniformity test of electrostatic field strength

The electric field generating power supply of Examples 1 to 4 and the control group was turned on, and the electrostatic field strength was measured at 10 points (all 10 cm away from the radiation plate) of A1, B1, C1, D1, E1, A2, B2, C2, D2, and E2 of the radiation plates of Examples 1 to 4 and the control group. The specific positions of the points are shown in FIG6 (the upper and lower plates in FIG6 are both radiation plates). Each point was measured three times, and the average value was taken. The results are shown in Table 2 below:

Table 2 Electrostatic field strength at each point in each group

Point Control group Example 1 Example 2 Example 3 Example 4 A1 2123.33±84.11 3124.33±121.15 2765.00±9.20 2321.00.±58.19 4542.67±20.07 A2 2070.33±69.81 3127.33±49.05 2798.00±35.18 2319.00±21.46 4537.67±7.84 B1 2074.67±64.34 3218.67±113.91 2762.33±56.18 2318.33±56.10 4610.00±9.90 B2 2120.33±43.39 3209.33±119.39 2751.33±66.08 2302.00±41.28 4572.33±20.82 C1 2144.33±21.31 3190.33±52.22 2741.67±22.05 2341.00±8.64 4698.00±98.02 C2 2110.67±63.17 3147.33±103.79 2817.67±32.62 2294.33±19.36 4582.33±38.39 D1 2058.00±28.28 3244.67±18.37 2764.00±31.89 2337.00±17.38 4575.33±47.15 D2 2076.00±41.02 3250.00±42.06 2730.00±67.38 2313.67±2.05 4644.67±33.86 E1 2383.67±40.54 3547.33±65.11 2882.33±11.47 2437.33±38.69 4612.00±69.40 E2 2402.33±38.09 3556.33±37.70 2943.67±41.96 2486.67±39.55 4591.67±32.09

According to the data in Table 2, the electrostatic field released by Examples 2 to 4 is more uniform, and the difference between the middle and edge positions is not significant; the electrostatic field strength uniformity of the control group is lower, and the electric strength in the middle position is higher, higher than the surrounding edge positions.

1.4 Impact on the growth curve of food microorganisms

Two portions of fresh meat of the same mass, size and freshness were placed on the radiation plates of Example 4 and the control group, respectively, and the effects of the electrostatic field on the growth curve and microscopic morphology of microorganisms in the fresh meat within 24 hours were measured. The results are shown in Figures 7 to 9.

As shown in FIG. 7 , FIG. 8 , and FIG. 9 , the electrostatic field released by the radiation plate of Example 4 can effectively inhibit the growth and reproduction of microorganisms, and can cause the rupture of the cell membrane of microorganisms, thereby killing them.

Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims (8)

1. An enhanced electrostatic field release device, characterized in that it comprises: an electric field generating power source having an output terminal; The radiation plate comprises an insulating layer, a discharge layer, an electrostatic field enhancement layer, and a water-blocking layer which are sequentially laid, wherein the discharge layer is connected to the output end wire, and the material of the electrostatic field enhancement layer comprises any one of polycarbonate, polytetrafluoroethylene, carbon fiber, and indium tin oxide coated soda-lime-based glass. 2. The enhanced electrostatic field release device according to claim 1, characterized in that the material of the electrostatic field enhancement layer is indium tin oxide coated soda-lime based glass. 3. The enhanced electrostatic field release device as described in claim 1 is characterized in that the insulating layer, the discharge layer, the electrostatic field enhancement layer, and the water-blocking layer are pressed together through a high-frequency pressing process to form the radiation plate. 4. The enhanced electrostatic field release device as described in claim 1 is characterized in that the radiation plate is rectangular and has insulating connection frames at its four corners. 5. The enhanced electrostatic field release device according to claim 1, characterized in that the thickness of the insulating layer is at least 3 mm, and the material of the insulating layer includes any one of acrylonitrile, butadiene, styrene copolymer, and silicone. 6. The enhanced electrostatic field release device according to claim 1 is characterized in that the discharge layer comprises a copper mesh layer, the orthographic projection of the discharge layer is located within the range covered by the orthographic projection of the insulating layer, the discharge layer is embedded on the insulating layer, and the thickness of the discharge layer is at least 2 mm. 7. The enhanced electrostatic field release device according to claim 1, characterized in that the orthographic projection of the electrostatic field enhancement layer completely covers the discharge layer, and the electrostatic field enhancement layer is at least 2 mm. 8. The enhanced electrostatic field release device according to claim 1, characterized in that the material of the water-blocking layer comprises propylene copolymer or polyvinyl chloride, the orthographic projection of the water-blocking layer completely covers the electrostatic field enhancement layer, and the thickness of the water-blocking layer is at least 1 mm.