CN111457497A - A corona discharge plasma air purification device and method - Google Patents

Abstract

The invention discloses a corona discharge plasma air purification device and method in the technical field of air purification, comprising a purification main body, and an air filter, an activated carbon filter, a plasma generator and The photocatalyst generator, the plasma generator includes an insulating support, a plurality of negative plates are fixed on the insulating support, and a mesh belt electrode is arranged between two adjacent negative plates. High-density corona discharge generates high-concentration plasma, fully ionizes the air, achieves better disinfection and purification effects, decomposes formaldehyde, bacteria and viruses by electric shock, decomposes organic pollutants, and outputs clean air; multiple mesh belts are used. The electrode ensures that the distance between each mesh strip electrode and the negative plate is the same, generating a uniform and consistent electric field, and at the same time solving the broken wire phenomenon of the filament electrode, which has a longer service life and can generate high-density plasma.

Description

A corona discharge plasma air purification device and method

technical field

The invention relates to the technical field of air purification, in particular to a corona discharge plasma air purification device and method.

Background technique

At present, the widely used air sterilizers are ozone sterilizers and ultraviolet sterilizers.

The principle of the ozone disinfection machine is to ionize the oxygen ions (02-) in the air into active oxygen (O3). The use of an oxygen generator or an oxygen tube is required. The ozone must reach a certain concentration in order to play the role of sterilization. However, when the ozone concentration in the air reaches 0.1mg/m3, it will irritate the eyes, nose, throat and respiratory tract of human beings. When the ozone concentration reaches 0.01-0.02mg/m3, it can smell bad smell; Toxic effects, can not be used in the case of people, and must be turned off for 40 minutes after disinfection before entering the room.

The principle of UV sterilizer is that after bacteria absorb ultraviolet rays, DNA strands are broken, resulting in cross-linking of nucleic acids and proteins, killing the biological activity of nucleic acids, causing bacterial death, and the sterilization efficiency can reach 96%-99.9%. The use time of the ultraviolet lamp is inversely proportional to the radiation intensity. Generally, the lamp tube must be replaced after the service life does not exceed 1000 hours, and the loss is relatively large. Moreover, ultraviolet radiation is harmful to human skin and eyes, and it cannot be used in the presence of people.

Plasma is a basic form of matter, which is an aggregate composed of charged particles (including positive ions, negative ions, electrons, etc.) and various neutral particles (atoms, molecules, free radicals and reactive groups). Macroscopically, it is electrically neutral. The plasma generated by the plasma air sterilizer is an atmospheric pressure non-thermal equilibrium plasma, commonly known as cold plasma. Its advantage is that the temperature of the plasma gas is very low, generally close to room temperature, but it has very high temperature electrons. In addition, it is also rich in a large number of free radicals and reactive groups. These electrons, free radicals and active groups play an important role in efficiently killing bacteria in the air. When the outside air passes through the plasma discharge area, the purpose of quickly killing bacteria in the air can be achieved.

Compared with the traditional ultraviolet air disinfection machine and ozone disinfection machine, the plasma air disinfection and purification machine has the characteristics of good sterilization effect, fast sterilization speed, no secondary pollution, and low energy consumption. It can decompose organic pollutants such as formaldehyde and benzene. It can be used in an environment where humans and machines coexist, and is suitable for a wide range of places.

However, the existing plasma air disinfection and purification machine adopts the discharge technology that the discharge sawtooth and the negative plate are in a vertical state, as shown in Figure 2-4, the discharge is the sawtooth tip (equivalent to a point) discharge to the ground, and the point-to-point discharge is a stripe Ribbon-shaped, basically does not form plasma, slow speed, low plasma density, can not effectively deal with pollutants in the air.

Based on this, the present invention designs a corona discharge plasma air purification device to solve the above problems.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a corona discharge plasma air purification device to solve the problems raised in the above-mentioned background art.

In order to achieve the above purpose, the present invention provides the following technical solutions: a corona discharge plasma air purification device, comprising a purification main body, and an air filter, an activated carbon filter, and a plasma generator are sequentially arranged in the middle of the purification main body from left to right. And the photocatalyst generator, the plasma generator includes an insulating support, an electrode group is fixed on the insulating support, and the electrode group includes a plurality of negative plates uniformly fixed on the insulating support along the vertical direction, and there are two adjacent negative plates between the two negative plates. The mesh belt electrode, one end of the mesh belt electrode is provided with a power supply connection end, and a high-voltage pulse power supply is connected through the power supply connection end, the negative plate is U-shaped, and one end is grounded, and the edge of the mesh belt electrode is evenly provided with a plurality of saw teeth, and The serrations are parallel to the negative plate.

Preferably, two parallel mesh belt electrodes are arranged between two adjacent mesh negative plates, and the two mesh belt electrodes are located in the same plane.

Preferably, the insulating support includes three sets of fixing plates, two fixing plates each time, and are sequentially arranged on both sides of the left end, the middle part and the right end of the electrode group.

Preferably, the distances between the mesh belt electrodes and the negative plates on the upper and lower sides thereof are equal.

Preferably, the air filter adopts a medium-efficiency filter without a partition.

A corona discharge plasma air purification method, comprising the following steps:

S1. Start the external equipment to make the outside air flow, enter the air purification device, and filter through the air filter and the activated carbon filter in turn;

S2. Start the plasma generator, connect the power connection end to the high-voltage pulse power supply, and a sawtooth tip on the mesh belt electrode corona discharges the two parallel negative plates at the same time, showing a horn shape, and passes through the air filter and activated carbon. The air filtered by the filter enters the plasma generator to fully ionize the air and achieve the effect of disinfection and purification;

S3. The evolved air enters the photocatalyst filter for further purification and filtration, and then the clean air is discharged from the other side of the device;

S4. Turn off the plasma generator and the external equipment, and the air purification ends.

Compared with the prior art, the beneficial effects of the present invention are: the present invention generates high-concentration plasma by generating a horn-shaped high-density corona discharge in the discharge area of the plasma generator, fully ionizing the air, and achieving better disinfection. Purification effect, electric shock decomposition of formaldehyde, bacteria and viruses, decomposition of organic pollutants, and output of clean air; multiple mesh strip electrodes are used to ensure that each mesh strip electrode has the same distance from the negative plate to generate a uniform electric field. At the same time, the broken wire of the wire electrode is solved, the service life is longer, and high-density plasma can be generated.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

Fig. 1 is the schematic diagram of plasma air purification device in the present invention;

Fig. 2 is the structural representation of plasma generator in the prior art;

Fig. 3 is the front view of the plasma generator in the prior art;

Fig. 4 is the partial enlarged schematic diagram at the place of plasma generator D in the prior art (the arrow in the figure is the bar discharge state representation);

Fig. 5 is the structural representation of the plasma generator in the present invention;

6 is a front view of the plasma generator in the present invention;

FIG. 7 is a partial enlarged schematic view of the plasma generator E in the present invention (the arrow in the figure is a schematic diagram of a horn-shaped discharge state).

In the accompanying drawings, the list of components represented by each number is as follows:

1-Air filter, 2-Activated carbon filter, 3-Photocatalyst filter, 4-Plasma generator, 5-Mesh belt electrode, 6-Negative plate, 7-Power connection end, 8-Insulation bracket.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. The embodiments of the present invention, and all other embodiments obtained by those of ordinary skill in the art without creative efforts, fall within the protection scope of the present invention.

Referring to the accompanying drawings, the present invention provides a technical solution: a corona discharge plasma air purification device, comprising a purification main body, and an air filter 1, an activated carbon filter 2, a plasma air filter 1, an activated carbon filter 2, a plasma The plasma generator 4 and the photocatalyst generator, the plasma generator 4 includes an insulating support 8, an electrode group is fixed on the insulating support 8, and the electrode group includes a plurality of negative plates 6 uniformly fixed on the insulating support 8 along the vertical direction. A mesh belt electrode 5 is arranged between the two adjacent negative plates 6, one end of the mesh belt electrode 5 is provided with a power supply connection terminal 7, and a high-voltage pulse power supply is connected through the power supply connection terminal 7, and the negative electrode plate 6 is U-shaped, and one end is grounded. , the edge of the mesh belt electrode 5 is evenly provided with a plurality of saw teeth, and the saw teeth are parallel to the negative plate 6 .

Wherein, two parallel mesh belt electrodes 5 are arranged between two adjacent mesh negative plates 6, and the two mesh belt electrodes 5 are located in the same plane.

Wherein, the insulating support 8 includes three sets of fixing plates, each including two fixing plates, and are sequentially arranged on both sides of the left end, the middle part and the right end of the electrode group.

The distances between the mesh belt electrodes 5 and the negative plates 6 on the upper and lower sides thereof are equal.

Among them, the air filter 1 adopts a medium-efficiency filter without a partition.

A corona discharge plasma air purification method, comprising the following steps:

S1, start the external equipment to make the outside air flow, enter the air purification device, and filter through the air filter 1 and the activated carbon filter 2 in turn;

S2, start the plasma generator 4, make the power connection end 7 connect to the high-voltage pulse power supply, and a sawtooth tip on the mesh belt electrode 5 corona discharges the two parallel negative plates 6 up and down at the same time, showing a horn shape, passing through the air The air filtered by the filter 1 and the activated carbon filter 2 enters the plasma generator 4, so that the air is fully ionized to achieve the effect of disinfection and purification;

S3. The evolved air enters the photocatalyst filter 3 for further purification and filtration, and then the clean air is discharged from the other side of the device;

S4. Turn off the plasma generator 4 and the external equipment, and the air purification ends.

Among them, when the high-frequency voltage reaches several kilovolts to tens of kilovolts, a horn-shaped cone-shaped high-density corona discharge is generated in the discharge area, and a high-concentration plasma is generated.

This technical solution adopts U-shaped electrode plate, which can reduce the circulation speed of air in the electric field, fully ionize the air, achieve better disinfection and purification effect, decompose formaldehyde, bacteria and viruses by electric shock, decompose organic pollutants, and output clean air.

This technical solution adopts a plurality of mesh strip electrodes or sawtooth tip electrodes to ensure that each mesh strip electrode or sawtooth tip electrode is at the same distance from the negative plate 6 to generate a uniform electric field. It solves the broken wire of the wire electrode, has a longer service life, and can generate high-density plasma.

The tip-to-board direct discharge in the prior art produces strip corona discharge, which has high ozone content and cannot coexist between humans and machines, and the tip is easily passivated at high temperature and affects the discharge effect. The discharge structure combined with the special plasma power supply can generate a horn-shaped cone-shaped corona discharge, which is different from the discharge method of other plasma air sterilizers, and can generate higher-density plasma, and the disinfection and purification effect is stronger.

In the description of this specification, description with reference to the terms "one embodiment," "example," "specific example," etc. means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one aspect of the present invention. in one embodiment or example. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above-disclosed preferred embodiments of the present invention are provided only as an aid to illustrate the present invention. The preferred embodiments do not describe all the details and do not limit the invention to specific embodiments only. Obviously, many modifications and variations are possible in light of the content of this specification. These embodiments are selected and described in this specification in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is to be limited only by the claims and their full scope and equivalents.

Claims (6)

1. The utility model provides a corona discharge plasma air purification device, includes the purification main part, its characterized in that, air cleaner (1), activated carbon filter (2), plasma generator (4) and photocatalyst generator have set gradually in the purification main part from left to right, plasma generator (4) are fixed with the electrode group on insulating support (8) including insulating support (8), the electrode group includes a plurality of negative plates (6) on insulating support (8) are evenly fixed in along vertical direction, are equipped with guipure electrode (5) between two adjacent negative plates (6), the one end of guipure electrode (5) is equipped with power connection end (7) to be connected with high-voltage pulse power through power connection end (7), negative plate (6) are the U-shaped, and one end ground connection, the border department of guipure electrode (5) evenly is equipped with a plurality of sawtooth, and the sawteeth are parallel to the negative plate (6).

2. A corona discharge plasma air cleaning device according to claim 1, wherein two parallel mesh belt electrodes (5) are arranged between two adjacent mesh negative plates (6), and the two mesh belt electrodes (5) are located in the same plane.

3. Corona discharge plasma air cleaning apparatus according to claim 1, wherein said insulating support (8) comprises three sets of fixing plates, two at a time, and is disposed in sequence on both sides of the left, middle and right ends of the electrode set.

4. A corona discharge plasma air cleaning device according to claim 1, wherein the distance between the mesh belt electrode (5) and the negative electrode plates (6) on both upper and lower sides thereof is equal.

5. Corona discharge plasma air cleaning device as claimed in claim 1, characterized in that the air filter (1) is a partitionless medium effect filter.

6. A corona discharge plasma air purification method is characterized by comprising the following steps:

s1, starting external equipment to enable outside air to flow, enabling the outside air to enter an air purification device, and sequentially filtering the outside air through an air filter (1) and an activated carbon filter (2);

s2, starting a plasma generator (4), connecting a power supply connecting end (7) with a high-voltage pulse power supply, enabling a sawtooth tip on a mesh belt electrode (5) to simultaneously carry out corona discharge on two negative plates (6) which are parallel up and down to be horn-shaped, and enabling air filtered by an air filter (1) and an active carbon filter (2) to enter the plasma generator (4) to fully ionize the air to achieve the disinfection and purification effects;

s3, the air after evolution enters a photocatalyst filter (3) for further purification and filtration, and then the clean air is discharged from the other side of the device;

and S4, turning off the plasma generator (4) and external equipment, and finishing air purification.

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