WO2018089656A1

WO2018089656A1 - Device for electrostatic air purification by inhibiting ozone generation

Info

Publication number: WO2018089656A1
Application number: PCT/US2017/060894
Authority: WO
Inventors: Wen Jun YU
Original assignee: Nuwave LLC
Current assignee: Nuwave LLC
Priority date: 2016-11-10
Filing date: 2017-11-09
Publication date: 2018-05-17
Anticipated expiration: 2019-05-10
Also published as: CN206366454U

Abstract

Disclosed is a device for electrostatic air purification by inhibiting ozone generation, comprising a dust collecting unit and a fan for guiding air to flow towards the dust collecting unit, characterized in that said dust collecting unit comprises a power supply, and a first discharge electrode, a dust collecting electrode and a second discharge electrode which are arranged sequentially in the air flow direction, said power supply comprises a first electrode and a second electrode which are opposite in polarity, said first discharge electrode is electrically connected to the first electrode, and said dust collecting electrode and second discharge electrode are both electrically connected to the second electrode. The electrostatic air purification device by inhibiting ozone generation of the present utility model has the advantages of being able to reduce ozone generated in the air purification process to oxygen, thus inhibiting ozone generation, etc.

Description

DEVICE FOR ELECTROSTATIC AIR PURIFICATION

BY INHIBITING OZONE GENERATION

Technical Field

[0001] The present application relates to the field of air purification. More specifically, the invention relates to a device for electrostatic air purification by inhibiting ozone generation.

Background Of The Invention

[0002] There is a small number of free electrons and ions in air, and the free electrons and ions move towards respectively two electrodes of an electric field under the action of the electric field generated by a discharge electrode and a dust collecting electrode in an air purification device. The higher the voltage is between the discharge electrode and the dust collecting electrode, the stronger the electric field and the faster the movement velocity of the free electrons and ions. Due to the movement of the ions, a current is formed between the discharge electrode and the dust collecting electrode. When the voltage rises to a certain value, ions near the discharge electrode have a higher energy and velocity and impact neutral atoms in air. The neutral atoms break down into positive and negative ions, ionizing the air. These charged ions move towards the two electrodes under the action of the electric field force, and come into contact with dust particulates in air and make same charged during moving, such that the dust particulates are adsorbed to the dust collecting electrode. After air around the discharge electrode has been fully ionized, a blue aureole is formed around the discharge electrode, the aureole being referred to as corona.

[0003] Current existing electrostatic air purification devices are designed based on the principle of corona discharge. With corona discharge, a certain concentration of ozone will be released inevitably, and with the increase of the voltage between the discharge electrode and the dust collecting electrode, the concentration of the released ozone will also increase, even to an extent of exceeding the international or national standards. However, reducing the voltage between the discharge electrode and the dust collecting electrode will also reduce the degree of ionization of the air around the discharge electrode, thereby affecting the dust collection effect of the air purification device, as well as affecting the dust affecting effect of the air purification device. This results in a decrease in the clean air output ratio of the air purification device. Therefore, it is particularly important to provide an air purification device that does not affect the clean air output ratio and can inhibit the generation of ozone.

Summary of the Invention

[0004] The present air purification device is intended to solve the above-mentioned technical problems and provide an air purification device capable of reducing ozone generated in the air purification process to oxygen, thus inhibiting the ozone generation of the air purification device.

[0005] Aspects of the invention can be realized by the following technical solutions: a device for electrostatic air purification by inhibiting ozone generation, comprising a dust collecting unit and a fan for guiding air to flow towards the dust collecting unit, characterized in that said dust collecting unit comprises a power supply, and a first discharge electrode, a dust collecting electrode and a second discharge electrode which are arranged sequentially in the air flow direction, said power supply comprises a first electrode and a second electrode which are opposite in polarity, said first discharge electrode is electrically connected with the first electrode, and said dust collecting electrode and second discharge electrode are both electrically connected to the second electrode.

[0006] Preferably, said first electrode is a negative or a positive electrode of the power supply. Also, preferably the second discharge electrode is electrically connected to a voltage adjuster for automatically adjusting the voltage between the second discharge electrode and the dust collecting electrode according to an ozone concentration. Further, the dust collecting electrode preferably comprises a plurality of metal plates arranged in parallel, and said metal plates are parallel to the air flow direction. Finally, the device is preferably characterized in that an air flow channel for air to flow is formed between two adjacent metal plates, and said air flow channel comprises an air inlet and an air outlet.

[0007] Preferably, a first metal wire electrically connected to the first electrode is suspended between two adjacent metal plates of said dust collecting electrode, and a first cantilevered end of said first metal wire forms said first discharge electrode. Likewise, a second metal wire electrically connected to the second electrode is preferably suspended between the two adjacent metal plates of said dust collecting electrode, and a second cantilevered end of said second metal wire forms the second discharge electrode. Also, the first discharge electrode is preferably located at the air inlet, said second discharge electrode is located at the air outlet, and the first cantilevered end and the second cantilevered end are both arranged in the middle position between the two adjacent metal plates. Further, the metal plates are preferably coated with a high resistance resin on both sides, and said high resistance resin is a PP or PVC material. Finally, the power supply is preferably a high voltage direct-current power supply.

[0008] Beneficial effects of the disclosed device, compared to the prior art, include inhibiting ozone generation by means of the addition of a second discharge electrode which is charged opposite to a first discharge electrode at the rear of the dust collecting electrode. Ozone in air is reduced to oxygen instantaneously when passing over the oppositely charged second discharge electrode. The numerical value of the voltage between the discharge electrode and the collecting electrode can be appropriately adjusted by the voltage adjuster according to an ozone concentration, ensuring that the reduction of ozone cannot be excessive, thus inhibiting the generation of ozone in the air purification device.

Brief Description of the Drawings

[0009] Particular embodiments of the present utility model are further described in detail below in conjunction with the accompanying drawings, wherein:

[0010] Figure 1 is a structural schematic view of the present utility model;

[0011] Figure 2 is a structural schematic view of a first embodiment of the first electrode in the present utility model;

[0012] Figure 3 is a structural schematic view of a second embodiment of the first electrode in the present utility model; and

[0013] Figure 4 is a sectional view at A of the metal plate in Figure 1. Detailed Description of Embodiments

[0014] While this invention is susceptible of embodiments in many different forms, there is shown in the drawings and will herein be described in detail at least one preferred embodiment of the invention with the understanding that the present disclosure is to be considered as an exemplification of the principles of the invention and is not intended to limit the broad aspect of the invention to any of the specific embodiments illustrated.

[0015] As shown in Figures 1, 2, 3 and 4, a device for electrostatic air purification by inhibiting ozone generation is illustrated. The device comprises a dust collecting unit 1 and a fan 2 for guiding air to flow towards the dust collecting unit 1, wherein the fan 2 can accelerate the air flow towards the dust collecting unit 1, thereby improving the air purification efficiency of the dust collecting unit 1. The dust collecting unit 1 can ionize the air such that the dust particulates in air are charged and the charged dust particulates are adsorbed, and can further reduce ozone generated during the high voltage discharge of the first discharge electrode 4 to oxygen, inhibiting the discharge of ozone. The dust collecting unit 1 comprises a power supply 3, a first discharge electrode 4, a dust collecting electrode 5 and a second discharge electrode 6 which are arranged sequentially in the air flow direction. The power supply 3 comprises a first electrode 7 and a second electrode 8 which are opposite in polarity. The first discharge electrode 4 is electrically connected to the first electrode 7. The dust collecting electrode 5 and the second discharge electrode 6 are both electrically connected to a second electrode 8. Air enters the dust collecting unit 1 under the guidance of the fan 2 and is ionized into positive and negative ions at the first discharge electrode 4. Since the polarities of the first electrode 7 and the second electrode 8 are opposite, and the first discharge electrode 4 is electrically connected to the first electrode 7 and the dust collecting electrode 5 is connected to the second electrode 8, there is a voltage between the dust collecting electrode 5 and the first discharge electrode 4, thereby forming an electric field. The positive and negative ions move towards the dust collecting electrode 5 under the action of the electric field, and come into contact with dust particulates in air and make same charged during moving, such that the dust particulates are adsorbed to the dust collecting electrode 5, achieving the purpose of air purification.

[0016] However, the first discharge electrode 4 will inevitably generate ozone during the high voltage discharge. The addition of a set of first discharge electrode 6, which are charged opposite to the first discharge electrode 4 at the rear of the dust collecting electrode 5, allow the ozone with "positive" electric energy in the purified air to instantaneously get "negative" electric energy and are reduced to oxygen, thus achieving the inhibition of the generation of ozone in the air purification device. The "positive" electric energy and "negative" electric energy are not intended to indicate being positively or negatively charged, but only to indicate the difference in charges, i.e., the "positive" electric energy can indicate either negative charges or positive charges. Moreover, the first discharge electrode 4, the dust collecting electrode 5 and the second discharge electrode 6 used are structurally independent, and the voltages applied to the electrodes do not interfere with one another.

[0017] Therefore, the voltage between the first discharge electrode 4 and the dust collecting electrode 5 can be adjusted according to the quantity of dust particulates in the air. That is, when the amount of dust particulates in the air is greater, the voltage between the first discharge electrode 4 and the dust collecting electrode 5 can be increased such that the degree of ionization of air at the first discharge electrode 4 is higher and the electric field intensity between the first discharge electrode 4 and the dust collecting electrode 5 is greater, thereby enabling the adsorption capacity of the dust collecting electrode 5 for charged dust particulates to be stronger, and after the continuous purification of indoor air through the air purification device, the amount of dust particulates in the air will be reduced significantly. Accordingly, a decrease in the voltage between the first discharge electrode 4 and the dust collecting electrode 5 thereupon can not only achieve the purpose of air purification but also can reduce the consumption of electric quantity, achieving an energy saving effect.

[0018] The first electrode 7 may be either a negative electrode or a positive electrode of the power supply 3, wherein in a first embodiment of the first electrode as shown in Figure 2, when the first electrode 7 is a negative electrode of the power supply 3, the second electrode 8 is then a positive electrode of the power supply 3, the first discharge electrode 4 electrically connected to the negative electrode of the power supply 3 is of negative corona, the corona current generated by the negative corona discharge is high such that the degree of ionization of the air when passing over the first discharge electrode 4 is higher, resulting in an easier adsorption by the dust collecting electrode 5, thus improving the purification efficiency.

[0019] An alternate embodiment of the first electrode is shown in Figure 3. The first electrode 7 is a positive electrode of the power supply 3, the second electrode 8 is then a negative electrode of the power supply 3, the first discharge electrode 4 electrically connected to the positive electrode of the power supply 3 is of positive corona, and the ozone concentration generated by the first discharge electrode 4 is low, thereby reducing the output of ozone when the air purification device is working.

[0020] The second discharge electrode 6 may be electrically connected to a voltage adjuster 9 for automatically adjusting the voltage between the second discharge electrode 6 and the dust collecting electrode 5 according to an ozone concentration. The main purpose of arranging the second discharge electrode 6 is to reduce ozone carried by the purified air to oxygen. However, when the voltage between the second discharge electrode 6 and the dust collecting electrode 5 is too high, the reduction of ozone in the air may be excessive. Whereas, when the voltage between the second discharge electrode 6 and the dust collecting electrode 5 is too low, the reduction of ozone in the air may be incomplete, causing the concentration of ozone in the clean air discharged from the purification device to exceed the international or national standards.

[0021] The voltage adjuster 9 is provided with an ozone concentration sensing device which can feed back a detected concentration of ozone in the purified air to a control unit in the voltage adjuster 9. The control unit can automatically adjust the voltage between the second discharge electrode 6 and the dust collecting electrode 5 according to a received ozone concentration signal. This can ensure that the ozone in the clean air is completely reduced to oxygen without over-reduction.

[0022] The dust collecting electrode 5 comprises a plurality of metal plates 14 arranged in parallel. The metal plates 14 are parallel to the air flow direction, the plurality of metal plates 14 are arranged linearly, i.e., the plurality of metal plates 14 are all at the same height, and the distances between two adjacent metal plates 14 are equal. An air flow channel 10 for air to flow is formed between two adjacent metal plates 14, and the air flow channel 10 comprises an air inlet 11 and an air outlet 12. Air flows into the air flow channel 10 formed between the two adjacent metal plates 14 from the air inlet 11 under the guidance of the fan 2, and air at the first discharge electrode 4 is ionized. Dust particulates in the air, after being charged, flow inside the air flow channel 10 along with the air. Under the action of the electric field formed between the first discharge electrode 4 and the dust collecting electrode 5, the charged dust particulates respectively move towards the two metal plates 14 forming the air flow channel 10 and are finally adsorbed to the two metal plates 14, while clean air after the dust particulate adsorption continues to flow inside the air flow channel 10. When the clean air flows to the air outlet 12, ozone in the air is reduced to oxygen at the second discharge electrode 6, thereby inhibiting the content of ozone in the clean air discharged from the air outlet 12, wherein setting the dust collecting electrode 5 to have a plurality of metal plates 14 can increase the adsorption area of the dust collecting electrode 5 and improve the adsorption efficiency of charged dust particulates in air.

[0023] A first metal wire 13 electrically connected to the first electrode 7 is suspended between two adjacent metal plates 14 of the dust collecting electrode 5. A first cantilevered end of the first metal wire 13 forms the first discharge electrode 4. A second metal wire 16 electrically connected to the second electrode 8 is suspended between the two adjacent metal plates 14 of the dust collecting electrode 5. A second cantilevered end of the second metal wire 16 forms the second discharge electrode 6. In the air ionization process, discharge occurs at the cantilevered end of the first metal wire 13 thus generating corona near the cantilevered end. Air in the corona area is ionized to form positive and negative ions. The positive and negative ions come into contact with dust particulates in air and make the same charged during moving, wherein the use of the first metal wire 13 can reduce the voltage of the corona discharge formed at the cantilevered end, achieving the aim of energy saving.

[0024] The first discharge electrode 4 can be located at the air inlet 11, the second discharge electrode 6 can be located at the air outlet 12, and the first discharge electrode 4 and the second discharge electrode 6 are both arranged in the middle position between the two adjacent metal plates 14. Since there are voltages between the first discharge electrode 4 and both the two adjacent metal plates 14, charged dust particulates can be absorbed to both of the metal plates 14. Arranging the first discharge electrode 4 at the air inlet can cause dust particulates in air to be absorbed to the metal plates 14 after being charged at the air inlet 11, whereby the effective adsorption area of the metal plates 14 can be increased. Arranging the first discharge electrode 4 in the middle position between the two adjacent metal plates 14 enables the adsorption capacities of the two metal plates 14 for dust particulates to be the same.

[0025] When the dust collecting electrode 5 is working, the main function thereof is to adsorb charged dust particulates in air. Therefore, after a long-term use of the dust collecting electrode 5, a thicker layer of dirt may be adhered to the metal plates 14. At this time, the dust collecting electrode 5 needs to be washed. However, since the dust collecting electrode 5 is arranged using metal plates 14, the metal plates 14 are liable to wear after repeated cleaning, resulting in a decrease in the strength of the metal plates 14, leading to a reduction in the service life of the metal plates 14. As shown in Figure 4, coating said metal plates 14 with a high resistance resin 15 on both sides can increase the wear resistance of the metal plates 14 and improve the service life of the metal plates 14. The resin 15 can be selected from high resistance resins such as PP and PVC materials for use as resin 15, which can allow the metal plates 14 of the dust collecting electrode 5 to have a very strong static charge-retaining capacity. That is, when the air purification device is disconnected from the power supply 3, i.e., the power is off, the metal plates 14 still retain a very strong high voltage static electricity and can remain at the adsorption capacity to charged dust particulates for a long time.

[0026] The power supply 3 may be a high voltage direct-current power supply that has the advantages of a small volume and a light weight, whereby the manufactured air purification device can have a small volume and a light weight, reducing the floor space of the air purification device and facilitating placement. Moreover, a lighter weight also makes the transfer of the air purification device more convenient. Furthermore, the high voltage direct-current power supply 3 further has the advantages of high-efficiency, large power, high-stability and high-reliability, whereby the voltage generated by the power supply 3 can be more stable, ensuring the working stability of the purification device. In addition, the high voltage generated by the high voltage direct-current power supply 3 is connected to the first discharge electrode 4 such that a large amount of positive and negative ions are generated from air at the first discharge electrode 4, thus allowing the adsorption of dust particulates by the dust collector 5 to be more sufficient.

[0027] The above embodiments are merely illustrative of the technical solution of the present utility model and are not intended to be limiting thereof, and any modifications or equivalent substitutions which do not depart from the spirit and scope of the utility model are intended to be included within the scope of the technical solution of the present invention.

Claims

CLAIMS What is claimed is:

1. A device for electrostatic air purification by inhibiting ozone generation, comprising:

a dust collecting unit, and

a fan for guiding air to flow towards the dust collecting unit, characterized in that said dust collecting unit comprises:

a power supply, and

a first discharge electrode,

a dust collecting electrode, and

a second discharge electrode,

being arranged sequentially in the air flow direction,

wherein said power supply comprises:

a first electrode, and

a second electrode

which are opposite in polarity, said first discharge electrode is electrically connected to the first electrode, and said dust collecting electrode and second discharge electrode are both electrically connected to the second electrode.

2. The device for electrostatic air purification by inhibiting ozone generation according to claim 1, wherein said first electrode is a negative or positive electrode of the power supply.

3. The device for electrostatic air purification by inhibiting ozone generation according to claim 1, wherein said second discharge electrode is electrically connected to a voltage adjuster for automatically adjusting the voltage between the second discharge electrode and the dust collecting electrode according to an ozone concentration.

4. The device for electrostatic air purification by inhibiting ozone generation according to claim 1, wherein said dust collecting electrode comprises a plurality of metal plates arranged in parallel, and said metal plates are parallel to the air flow direction.

5. The device for electrostatic air purification by inhibiting ozone generation according to claim 4, further comprising an air flow channel for air to flow formed between said two adjacent metal plates, and said air flow channel comprises an air inlet and an air outlet.

6. The device for electrostatic air purification by inhibiting ozone generation according to claim 5, wherein a first metal wire electrically connected to the first electrode is suspended between two adjacent metal plates of said dust collecting electrode, and a first cantilevered end of said first metal wire forms the first discharge electrode.

7. The device for electrostatic air purification by inhibiting ozone generation according to claim 6, wherein a second metal wire electrically connected to the second electrode is suspended between the two adjacent metal plates of said dust collecting electrode, and a second cantilevered end of said second metal wire forms the second discharge electrode.

8. The device for electrostatic air purification by inhibiting ozone generation according to claim 7, wherein said first discharge electrode is located at the air inlet, said second discharge electrode is located at the air outlet, and the first discharge electrode and the second discharge electrode are both arranged in the middle position between the two adjacent metal plates.

9. The device for electrostatic air purification by inhibiting ozone generation according to claim 4, wherein said metal plates are coated with a high resistance resin on both sides, and said high resistance resin is a PP or PVC material.

10. The device for electrostatic air purification by inhibiting ozone generation according to claim 1, wherein said power supply is a high-voltage direct-current power supply.