CN106051918B

CN106051918B - Plasma air purification device

Info

Publication number: CN106051918B
Application number: CN201610526199.0A
Authority: CN
Inventors: 王智
Original assignee: Beijing Ares Technology Co ltd
Current assignee: Beijing Ares Technology Co ltd
Priority date: 2016-07-05
Filing date: 2016-07-05
Publication date: 2022-05-20
Anticipated expiration: 2036-07-05
Also published as: CN106051918A

Abstract

The present invention provides a plasma air purification apparatus, which includes: a main body; a positive plate disposed on the main body, the surface of the positive plate being provided with a first point discharge portion; the negative plate is arranged on the main body and is opposite to the positive plate, and a second point discharge part is arranged on the surface of the negative plate close to the positive plate; the first point discharge part and the second point discharge part are both provided with a plurality of points. The invention can form stable and uniform plasma field under low voltage through the continuous point discharge between the plurality of points of the first point discharge part and the plurality of points of the second point discharge part.

Description

Plasma air purification device

Technical Field

The invention relates to the field of air purification equipment, in particular to a plasma air purification device.

Background

Plasma (plasma for short) is another basic form of matter existing in nature besides gas, solid and liquid, and is generally called the fourth state of matter. Under the action of external energy, such as heating, external electric field, laser irradiation, etc., gas molecules or atoms are ionized to form negatively charged electrons and positively charged ions. When the ionized components in the gas exceed one thousandth, the behavior of the ionized components is mainly governed by coulomb force between ions and electrons, the interaction between neutral particles is reduced, and the motion of the ionized gas is obviously influenced by a magnetic field and becomes a conductive fluid with high conductivity. Ionized gas composed of ions, electrons, free radicals, excited molecules and atoms is in an excited and ionized high-energy state, the total number of negative charges of the electrons is equal to the total number of positive charges of the ions, the electrons and the positive charges of the ions are not electrically charged to the outside macroscopically, and the ionized gas is neutral and is called plasma.

In general, plasma can be divided into high temperature plasma and low temperature plasma. Wherein, in the low temperature plasma system, when the temperature of the electron reaches 1000-2500K, the temperature of other particles is only 300-500K, and the whole system is still in a low temperature state. The low-temperature plasma technology has wide application in the aspects of material surface treatment, catalysis, sewage and waste gas purification and the like. Low temperature plasma, in which ionized gas consisting of ions, electrons, radicals, excited molecules and atoms is in an excited and ionized high energy state and is liable to react with substances in contact with it, is widely used in the fields of sterilization, surface modification (improvement of properties in wettability, water absorbability, printability, adhesiveness, and conductivity of paper, film, textile, and fiber), film deposition, etching, device cleaning, and the like, and also in air purification and industrial exhaust gas treatment.

The principle of treating pollutants by the low-temperature plasma technology is as follows: under the action of an external electric field, a large amount of energy-carrying electrons generated by medium discharge bombard gas pollutant molecules to ionize, dissociate and excite the gas pollutant molecules, and then a series of complex physical and chemical reactions are initiated to convert complex macromolecular pollutants into simple micromolecular safe substances or convert toxic and harmful substances into nontoxic and harmless or low-toxicity and low-harm substances, so that the pollutants are degraded and removed; the energetic electrons contact the solid contaminants to charge the solid contaminants and combine into large particles during collisions and deposit on the dust collecting member. At present, the low-temperature plasma technology is a high-tech technology with extremely strong potential advantages in the field of environmental pollution treatment, and is highly concerned by relevant scientific communities at home and abroad.

The low-temperature plasma air purification technology mainly comprises a high-voltage power supply and a plasma ionization field, wherein the plasma ionization field mainly comprises a plate-to-plate type structure, a wire-to-barrel type structure and other structural forms, the plasma ionization field generated under the structural forms is not uniformly distributed, abnormal discharge and other conditions exist, and the most important is that: the voltage between the electrodes is generally divided into 12kV, 16kV to 42kV, the ozone amount of the ozone generated by high voltage higher than 10kV is far higher than the national safety standard, the excessive ozone has very adverse effect on human health, and the stable plasma field with uniform low temperature is difficult to generate when the voltage is lower than 12 kV.

Disclosure of Invention

The invention mainly aims to provide a plasma air purification device to solve the problem that a plasma field generated by plasma air purification equipment in the prior art under low voltage is not stable and uniform enough.

In order to achieve the above object, according to one aspect of the present invention, there is provided a plasma air purification apparatus including: a main body; a positive plate disposed on the main body, the surface of the positive plate being provided with a first point discharge portion; the negative plate is arranged on the main body and is opposite to the positive plate, and a second point discharge part is arranged on the surface of the negative plate close to the positive plate; the first point discharge part and the second point discharge part are both provided with a plurality of points.

Further, the first tip discharge portion is plural, and the plural first tip discharge portions are provided along a longitudinal direction of the positive electrode plate.

Further, the second tip discharge portion is plural, and the plural second tip discharge portions are disposed along a length direction of the negative electrode plate.

Further, the plurality of first tip discharge portions are disposed at equal intervals.

Further, the plurality of second tip discharge portions are disposed at equal intervals.

Further, a first gap is provided between two adjacent first tip discharge portions, and the plurality of second tip discharge portions are provided in the plurality of first gaps in a one-to-one correspondence.

Further, a second gap is arranged between two adjacent second point discharge parts, and the first point discharge part is arranged on the central line of the second gap.

Further, the first tip discharge portion includes: the first vertical plate is vertically arranged on the surface of the positive plate; the first transverse plate is vertically arranged at one end, far away from the positive plate, of the first vertical plate, and the surface, close to the first vertical plate, of the first transverse plate is symmetrically arranged by taking the center line of the first vertical plate in the height direction as a symmetry axis; the second tip discharge portion includes: the second vertical plate is vertically arranged on the surface of the negative plate close to the positive plate; the second transverse plate is vertically arranged at one end, far away from the negative plate, of the second vertical plate, and the plate surface, close to the second vertical plate, of the second transverse plate is symmetrically arranged by taking the center line of the second vertical plate in the height direction as a symmetry axis; the distance from the first transverse plate to the negative plate is smaller than the distance from the second transverse plate to the negative plate.

Further, the electrified DC voltage of the plasma air purification device is 8000-9500V, the frequency is 10-40 MHZ, and the discharge power is 0.1-2W/cm²Positive plate to negativeThe distance between the polar plates is 1-6 mm, the depths of the positive plate and the negative plate are 10-20 mm, and the sum of the cross sectional areas of the ionization cavity formed between the positive plate and the negative plate in the depth direction of the negative plate accounts for 0.1-0.5 of the total area of the plasma air purification device.

Further, the plasma air purification device comprises a plurality of positive plates and a plurality of negative plates, and the positive plates and the negative plates are arranged on the main body in a one-to-one correspondence mode.

By applying the technical scheme of the invention, as the positive plate and the negative plate are respectively provided with the specific point discharge structures, namely the plurality of points on the first point discharge part and the plurality of points on the second point discharge part, when the plasma air purification device works, point discharge continuously occurs between the plurality of points of the first point discharge part and the plurality of points of the second point discharge part, and a dense mesh-shaped plasma field is formed. The plasma generating device does not need to generate a stable plasma field by means of high-energy ionization of high voltage, and can form a stable and uniform plasma field under low voltage through continuous point discharge between the plurality of points of the first point discharge part and the plurality of points of the second point discharge part.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic view showing a simplified structure of a plasma purification apparatus according to a first embodiment of the present invention, in which both positive and negative electrode plates are used;

fig. 2 is a schematic view showing a simplified structure of a plasma purification apparatus according to a first embodiment of the present invention, in which a plurality of positive electrode plates and a plurality of negative electrode plates are provided;

fig. 3 schematically shows a simplified structure diagram of a first and a second tip discharge portions in a first embodiment of a plasma purification apparatus of the present invention; and

fig. 4 schematically shows a simplified structure of the first and second tip discharge portions in the second embodiment of the plasma purification apparatus of the present invention.

Wherein the figures include the following reference numerals:

10. a main body; 20. a positive plate; 30. a negative plate; 21. a first tip discharge portion; 211. a first vertical plate; 212. a first transverse plate; 22. a first gap; 31. a second tip discharge portion; 311. a second vertical plate; 312. a second transverse plate; 32. a second gap.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein.

Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Spatially relative terms, such as "above … …," "above … …," "above … … surface," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures.

For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may also be oriented 90 degrees or at other orientations and the spatially relative descriptors used herein interpreted accordingly.

Referring to fig. 1 to 4, the present invention provides a plasma air purification apparatus including a main body 10, a positive electrode plate 20, and a negative electrode plate 30, wherein the positive electrode plate 20 is disposed on the main body 10, a first tip discharge portion 21 is disposed on a surface of the positive electrode plate 20, the negative electrode plate 30 is disposed on the main body 10, the negative electrode plate 30 is disposed opposite to the positive electrode plate 20, a second tip discharge portion 31 is disposed on a surface of the negative electrode plate 30 adjacent to the positive electrode plate 20, and a plurality of tips are disposed on each of the first tip discharge portion 21 and the second tip discharge portion 31. The plasma air purification device does not need to generate a stable plasma field by means of high-voltage high-energy ionization, and when the plasma air purification device works, the plasma air purification device is charged with lower voltage and then discharges through the continuous tips between the plurality of tips of the first tip discharge part 21 and the plurality of tips of the second tip discharge part 31 to form a stable and uniform plasma field, and solid particles and gaseous pollutants in air are purified with moderate energy.

Referring to fig. 1, in order to improve stability and uniformity of a plasma field generated by the plasma air cleaning device of the present invention, it is preferable that the first tip discharge portion 21 of the present invention is provided in plurality, and the plurality of first tip discharge portions 21 are disposed along a length direction of the positive electrode plate 20. In operation, the plurality of first point discharge portions 21 and the plurality of discharge points thereon and the plurality of discharge points on the second point discharge portion 31 are subjected to point discharge to form a more stable and uniform plasma field.

Referring to fig. 1, in order to further improve the stability and uniformity of the plasma field generated by the plasma air cleaning device of the present invention, it is preferable that the second tip discharge portions 31 of the present invention are plural, and the plural second tip discharge portions 31 are disposed along the length direction of the negative plate 30. In operation, the plurality of first point discharge portions 21 and the plurality of discharge points thereon and the plurality of second point discharge portions 31 and the discharge points on the second point discharge portions 31 generate point discharge to form a more stable and uniform plasma field.

In order to make the plasma field generated by the plasma air cleaning device of the present invention more uniform, it is preferable that the plurality of first tip discharge portions 21 of the present invention are disposed at equal intervals.

In order to further improve the uniformity of the plasma field generated by the plasma air cleaning device of the present invention, it is preferable that the plurality of second tip discharge portions 31 of the present invention are disposed at equal intervals.

Referring to fig. 1, in order to shorten the distance between the first and second

tip discharge portions

21 and 31 and further stabilize the generated plasma field without changing the distance between the positive and

negative electrode plates

20 and 30, it is preferable that a first gap 22 is provided between two adjacent first tip discharge portions 21 and a plurality of second tip discharge portions 31 are provided in the plurality of first gaps 22 in one-to-one correspondence in the present invention. In other words, the plurality of first tip discharge portions 21 and the plurality of second tip discharge portions 31 are disposed to be staggered with each other, and the tips of the second tip discharge portions 31 protrude into the gaps formed by the first tip discharge portions 21. During operation, the plurality of discharge tips of the second point discharge portion 31, except for generating the point discharge with the discharge tip at the top of the first point discharge portion 21, also generate the point discharge with the bottom of the first point discharge portion 21 to form a plasma field, and the distance between the first point discharge portion 21 and the second point discharge portion 31 is short, so that the generated plasma field is more stable.

In order to make the plasma field generated by the plasma air cleaning device of the present invention more uniform, it is preferable that a second gap 32 is provided between two adjacent second tip discharge portions 31, and the first tip discharge portion 21 is provided on the center line of the second gap 32. Preferably, the first tip discharge part 21 is equidistant from the first tip discharge part 21, the second tip discharge part 31 is equidistant from the second tip discharge part 31, and the first tip discharge part 21 is equidistant from the second tip discharge part 31, so that the plasma field is more uniform.

Referring to fig. 3, specifically, the first tip discharge portion 21 in the present invention includes a first vertical plate 211 and a first horizontal plate 212, the first vertical plate 211 being vertically disposed on the surface of the positive electrode plate 20; the first horizontal plate 212 is vertically disposed at an end of the first vertical plate 211 away from the positive plate 20, and the surface of the first horizontal plate 212 close to the first vertical plate 211 is symmetrically disposed with a center line of the first vertical plate 211 in the height direction as a symmetry axis, wherein the center line of the first vertical plate 211 in the height direction coincides with the schematic simplified diagram of the first vertical plate 211 in fig. 3. The first vertical plate 211 and the second horizontal plate 312 in the first point discharge portion 21 of the present invention form a plurality of discharge clamps, for example, the first horizontal plate 212 of the present invention is rectangular, four corners of the first horizontal plate 212 form four discharge points, an edge of a connection between the first vertical plate 211 and the first horizontal plate 212 forms two discharge points, and an edge of a connection between the first vertical plate 211 and the positive plate 20 forms two discharge points.

Of course, the shape of the first horizontal plate 212 is not limited to a rectangle, and other shapes such as a regular pentagon, a regular hexagon, etc. can meet the requirement of the plasma field generated by the plasma air purification device of the present invention.

The second tip discharge portion 31 includes a second vertical plate 311 and a second lateral plate 312, the second vertical plate 311 being vertically disposed on a surface of the negative electrode plate 30 adjacent to the positive electrode plate 20; the second horizontal plate 312 is vertically disposed at one end of the second vertical plate 311 away from the negative plate 30, and the plate surface of the second horizontal plate 312 close to the second vertical plate 311 is symmetrically disposed with the center line of the second vertical plate 311 in the height direction as a symmetry axis. The second vertical plate 311 and the second horizontal plate 312 in the second sharp pointed discharge portion 31 of the present invention form a plurality of discharge clamps, for example, if the second horizontal plate 312 of the present invention is rectangular, four corners of the second horizontal plate 312 form four discharge sharp points, two discharge sharp points are formed at the edge of the connection between the second vertical plate 311 and the second horizontal plate 312, and two discharge sharp points are formed at the edge of the connection between the second vertical plate 311 and the negative plate 30.

Of course, the shape of the second horizontal plate 312 is not limited to a rectangle, and other shapes such as a regular pentagon, a regular hexagon, etc. can meet the requirement of the plasma field generated by the plasma air purification device of the present invention.

In order to further improve the stability of the plasma air purification apparatus of the present invention, it is preferable that the distance from the first horizontal plate 212 to the negative electrode plate 30 is smaller than the distance from the second horizontal plate 312 to the negative electrode plate 30. Referring to fig. 3, the first horizontal plate 212 is located in the space formed by the second vertical plate 311, and the second horizontal plate 312 is located in the space formed by the first vertical plate 211, so that after power is applied, sufficient tip discharge occurs between the first tip discharge portion 21 and the second tip discharge portion 31, and a stable plasma field is formed.

In order to increase the contact area of the plasma air purification apparatus of the present invention with air, it is preferable that the plasma air purification apparatus includes a plurality of positive electrode plates 20 and a plurality of negative electrode plates 30, and the plurality of positive electrode plates 20 and the plurality of negative electrode plates 30 are mounted on the body 10 in one-to-one correspondence.

Referring to fig. 4, in another embodiment of the present invention, the first tip discharge portion 21 includes a plurality of first horizontal plates 212 to increase the number of discharge tips, the second tip discharge portion 31 includes a plurality of second horizontal plates 312 to increase the number of discharge tips, and the plurality of first horizontal plates 212 and the plurality of second horizontal plates 312 are staggered with each other, so that a more uniform and stable plasma field is formed between the plurality of first horizontal plates 212 and the plurality of second horizontal plates 312.

The electrified direct current voltage of the plasma air purification device is 8000-9500V, and is much lower than the voltage in the prior art, ionization does not generate excessive ozone, the frequency is 10-40 MHZ, and the discharge power is 0.1-2W/cm²The distance between the positive plate 20 and the negative plate 30 is 1-6 mm, and the depth of the positive plate 20 and the negative plate 30 is 10-20 mm, wherein the depth refers to the length of the positive plate 20 and the negative plate 30 on an air flowing path, and the sum of the cross sections of the ionization cavity formed between the positive plate 20 and the negative plate 30 in the depth direction of the negative plate 30 accounts for 0.1-0.5 of the total area of the plasma air purification device. The ionization cavity formed between the positive electrode plate 20 and the negative electrode plate 30 is a space where the plasma air purification apparatus of the present invention ionizes. In determining the distance between the positive electrode plate 20 and the negative electrode plate 30, the discharge possibility when the distance between the positive electrode plate 20 and the negative electrode plate 30 is a certain amount is calculated by the existing theory to determine whether the distance can generate a stable ion field, then the ion field generated by the distance is actually verified to be stable, if the distance is stable, the ion field is recalculated, if the ion field is not stable, the distance between the positive electrode plate 20 and the negative electrode plate 30 is determined after a plurality of tests, and since the first tip discharge part 21 and the second tip discharge part 31 are respectively arranged on the positive electrode plate 20 and the negative electrode plate 30, the distance between the positive electrode plate 20 and the negative electrode plate 30 here refers to the distance between the positive electrode plate 20 including the first tip discharge part 21 and the negative electrode plate 30 including the second tip discharge part 31

When the distance between the positive plate 20 and the negative plate 30 is 1mm, the depth of the ionization cavity is 20mm, the direct current voltage is 9500V, the frequency is 40MHz, the discharge power is 2W/cm2, and the ratio of the cross-sectional area of the ionization cavity to the total area of the plasma air purification device is 0.1; GB/T18801-2015 air purifier and GB21551.3 Special requirements for air purifier with antibacterial, degerming and purifying functions for household and similar appliances are adopted to measure the filtering efficiency and the sterilizing performance of the high-efficiency composite air purifying filter screen. The test result shows that: the single PM2.5 purification rate is 98.9%, the single formaldehyde purification rate is 99.3%, and the single bacteria and virus purification rate is 99.4%, wherein the high single purification rate is that the purification effect of the low-temperature plasma also has significant biological effect, and the electric energy shearing force generated on the surfaces of various bacteria, viruses and other microorganisms is greater than the surface tension of cell membranes, so that the cell membranes are damaged, and the microorganisms die, and in addition, the results of ozone leakage detection adopting the ozone sanitation standard GB/T18202-2000 in indoor air show that: the concentration of ozone at the purification air outlet is 0.14ppm, which is lower than 1.5ppm of the national safety standard, and the reduction of the amount of ozone is due to the significant reduction of the voltage.

When the distance between the positive plate 20 and the negative plate 30 is 6mm, the depth of the ionization cavity is 10mm, the direct-current voltage is 8000V, the frequency is 10MHz, the discharge power is 0.1W/cm2, and the ratio of the cross-sectional area of the ionization cavity to the total area of the plasma air purification device is 0.5; GB/T18801-2015 air purifier and GB21551.3 Special requirements for air purifier with antibacterial, degerming and purifying functions for household and similar appliances are adopted to measure the filtering efficiency and the sterilizing performance of the high-efficiency composite air purifying filter screen. The test result shows that: the single PM2.5 purification rate is 90.3%, the single formaldehyde purification rate is 89.9%, and the single bacteria and virus purification rate is 95.9%. The concentration of ozone at the purified air outlet is 0.09ppm, which is lower than 1.5ppm of the national safety standard.

When the distance between the positive plate 20 and the negative plate 30 is 2mm, the depth of the ionization cavity is 12mm, the direct current voltage is 8500V, the frequency is 15MHz, the discharge power is 0.5W/cm2, and the ratio of the cross-sectional area of the ionization cavity to the total area of the plasma air purification device is 0.15; GB/T18801-2015 air purifier and GB21551.3 Special requirements for air purifier with antibacterial, degerming and purifying functions for household and similar appliances are adopted to measure the filtering efficiency and the sterilizing performance of the high-efficiency composite air purifying filter screen. The test result shows that: the single PM2.5 purification rate is 90.8%, the single formaldehyde purification rate is 90.5%, and the single bacteria and virus purification rate is 96.2%. The concentration of ozone at the purified air outlet is 0.13ppm, which is lower than 1.5ppm of the national safety standard.

When the distance between the positive plate 20 and the negative plate 30 is 3mm, the depth of the ionization cavity is 14mm, the direct-current voltage is 8800V, the frequency is 18MHz, the discharge power is 1W/cm2, and the ratio of the cross-sectional area of the ionization cavity to the total area of the plasma air purification device is 0.2; GB/T18801-2015 air purifier and GB21551.3 Special requirements for air purifier with antibacterial, degerming and purifying functions for household and similar appliances are adopted to measure the filtering efficiency and the sterilizing performance of the high-efficiency composite air purifying filter screen. The test result shows that: the single PM2.5 purification rate is 91.4%, the single formaldehyde purification rate is 90.8%, and the single bacteria and virus purification rate is 96.8%. The concentration of ozone at the purified air outlet is 0.12ppm, which is lower than 1.5ppm of the national safety standard.

When the distance between the positive plate 20 and the negative plate 30 is 4mm, the depth of the ionization cavity is 16mm, the direct-current voltage is 9000V, the frequency is 20MHz, the discharge power is 2W/cm2, and the ratio of the cross-sectional area of the ionization cavity to the total area of the plasma air purification device is 0.3; GB/T18801-2015 air purifier and GB21551.3 Special requirements for air purifier with antibacterial, degerming and purifying functions for household and similar appliances are adopted to measure the filtering efficiency and the sterilizing performance of the high-efficiency composite air purifying filter screen. The test result shows that: the single PM2.5 purification rate is 92.1%, the single formaldehyde purification rate is 91.5%, the single bacteria and virus purification rate is 97.1%, and compared with other embodiments, the higher bacteria and virus purification rate is 98.7%, which is caused by higher discharge power to kill microorganisms. In addition, the concentration of ozone at the purification air outlet is 0.11ppm, which is lower than 1.5ppm of the national safety standard.

When the distance between the positive plate 20 and the negative plate 30 is 5mm, the depth of the ionization cavity is 18mm, the direct-current voltage is 9300V, the frequency is 30MHz, the discharge power is 0.18W/cm2, and the ratio of the cross-sectional area of the ionization cavity to the total area of the plasma air purification device is 0.45; GB/T18801-2015 air purifier and GB21551.3 Special requirements for air purifier with antibacterial, degerming and purifying functions for household and similar appliances are adopted to measure the filtering efficiency and the sterilizing performance of the high-efficiency composite air purifying filter screen. The test result shows that: the single PM2.5 purification rate is 93.4%, the single formaldehyde purification rate is 92.6%, and the single bacteria and virus purification rate is 97.3%. The concentration of ozone at the purified air outlet is 0.10ppm, which is lower than 1.5ppm of the national safety standard.

From the above, it can be seen that: the voltage of a plasma field generated by the T-shaped plates of the first point discharge part and the second point discharge part in an electrode distribution mode of the T-shaped plates is lower and is obviously lower than 12kV and 16-42 kV, the generation amount of ozone is obviously lower than the national standard, the single PM2.5 purification rate is 90.3%, the single formaldehyde purification rate is 89.9%, and the single bacterial and viral purification rate is 95.9%. In order to show the superiority of the invention, the air purification efficiency of the plate-type low-temperature plasma device is also tested by the plate with the same electrode area, but the single PM2.5 purification rate is lower than 50%, the single formaldehyde purification rate is 40%, and the single bacteria and virus purification rate is 50%, because the stable plasma field is difficult to form by low voltage, and the purification efficiency is low. The invention is a plasma air purification device which can generate stable plasma, the voltage is reduced, the ozone meets the national safety standard, and the purification efficiency is higher than that of the similar products.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A plasma air purification apparatus, comprising:

a main body (10);

a positive electrode plate (20), wherein the positive electrode plate (20) is arranged on the main body (10), and a first point discharge part (21) is arranged on the surface of the positive electrode plate (20);

a negative electrode plate (30), wherein the negative electrode plate (30) is arranged on the main body (10), the negative electrode plate (30) is arranged opposite to the positive electrode plate (20), and a second point discharge part (31) is arranged on the surface of the negative electrode plate (30) close to the positive electrode plate (20);

a plurality of tips are arranged on the first tip discharge part (21) and the second tip discharge part (31);

the distance between the positive plate (20) and the negative plate (30) is 1-6 mm, the depth of the positive plate (20) and the negative plate (30) is 10-20 mm, and the sum of the cross sections of the ionization cavity formed between the positive plate (20) and the negative plate (30) in the depth direction of the negative plate (30) accounts for 0.1-0.5 of the total area of the plasma air purification device.

2. The plasma air-cleaning device according to claim 1, wherein the first tip discharge portion (21) is plural, and the plural first tip discharge portions (21) are provided along a length direction of the positive electrode plate (20).

3. The plasma air purification apparatus according to claim 1, wherein the second tip discharge portion (31) is plural, and the plural second tip discharge portions (31) are provided along a length direction of the negative electrode plate (30).

4. The plasma air cleaning device according to claim 2, wherein the plurality of first tip discharge portions (21) are arranged at equal intervals.

5. The plasma air cleaning apparatus according to claim 3, wherein the plurality of second tip discharge portions (31) are disposed at equal intervals.

6. The plasma air purification apparatus according to claim 4, wherein a first gap (22) is provided between adjacent two of the first tip discharge portions (21), and the plurality of second tip discharge portions (31) are provided in the plurality of first gaps (22) in one-to-one correspondence.

7. The plasma air cleaning apparatus according to claim 5, wherein a second gap (32) is provided between adjacent two of the second tip discharge portions (31), and the first tip discharge portion (21) is provided on a center line of the second gap (32).

8. The plasma air purification apparatus according to claim 1, wherein the first tip discharge portion (21) includes:

a first riser (211), the first riser (211) being vertically disposed on a surface of the positive electrode plate (20);

the first transverse plate (212) is vertically arranged at one end, far away from the positive plate (20), of the first vertical plate (211), and the plate surface, close to the first vertical plate (211), of the first transverse plate (212) is symmetrically arranged by taking the center line of the first vertical plate (211) in the height direction as a symmetry axis;

the second tip discharge portion (31) includes:

a second riser (311), the second riser (311) being vertically disposed on a surface of the negative electrode plate (30) close to the positive electrode plate (20);

the second transverse plate (312) is vertically arranged at one end, far away from the negative plate (30), of the second vertical plate (311), and the plate surfaces, close to the second vertical plate (311), of the second transverse plate (312) are symmetrically arranged by taking the center line of the second vertical plate (311) in the height direction as a symmetry axis;

the distance from the first transverse plate (212) to the negative plate (30) is smaller than the distance from the second transverse plate (312) to the negative plate (30).

9. The plasma air purification apparatus of claim 6, wherein the DC voltage of the plasma air purification apparatus is 8000-9500V, the frequency is 10-40 MHz, and the discharge power is 0.1-2W/cm²。

10. The plasma air purification apparatus according to claim 1, comprising a plurality of the positive electrode plates (20) and a plurality of the negative electrode plates (30), wherein the plurality of positive electrode plates (20) and the plurality of negative electrode plates (30) are mounted on the main body (10) in one-to-one correspondence.