CN114900944A

CN114900944A - Plasma generating device and air purifier

Info

Publication number: CN114900944A
Application number: CN202210475844.6A
Authority: CN
Inventors: 徐帅; 刘文正; 肖德玲; 汪春节; 封宗瑜; 罗汉兵
Original assignee: Gree Electric Appliances Inc of Zhuhai; Beijing Jiaotong University
Current assignee: Gree Electric Appliances Inc of Zhuhai; Beijing Jiaotong University
Priority date: 2022-04-29
Filing date: 2022-04-29
Publication date: 2022-08-12

Abstract

The present invention relates to a plasma generating device and an air purifier, wherein the plasma generating device comprises: the spiral electrode comprises an inner electrode, an insulating layer and a carbon fiber electrode, wherein the inner electrode is suitable for being connected with an alternating current power supply, and the carbon fiber electrode is suitable for being grounded; the distance between the catalyst electrode and the spiral electrode is L which is less than or equal to 5mm, and the catalyst electrode is suitable for being connected with a direct current power supply. The catalyst electrode in the plasma generating device can be used as a direct current electrode to expand the purification range of the plasma generating device and adsorb particulate matters, and can also be used for removing ozone generated in the glow discharge process, so that the purification range of the plasma generating device can be expanded, and the air purification effect of the plasma generating device can be improved. In addition, the plasma generating device has the advantages of simple structure, easy manufacture, safe and reliable use and convenient implementation, popularization and application.

Description

Plasma generating device and air purifier

Technical Field

The invention relates to the technical field of air purification equipment, in particular to a plasma generating device and an air purifier.

Background

With the development of social economy, the requirements of residents on house interior decoration are higher and higher. The use of large-scale decoration materials and building materials leads the concentration of pollutants such as formaldehyde, TVOC and the like in indoor air to exceed the standard, and influences the health of people. At present, methods for purifying indoor air pollution include ventilation methods, plant purification methods, microbiological methods, physical chemical adsorption methods, plasma methods, and the like.

Because high-energy electrons, excited particles, active groups and the like exist in low-temperature plasma, harmful gases can be effectively catalyzed and degraded by utilizing plasma discharge, and therefore, the low-temperature plasma is increasingly applied to the fields of air purification and the like. The plasma discharge comprises corona discharge and glow discharge, and the glow discharge has larger area and higher plasma density, so the plasma discharge has good application prospect. In general, glow discharge plasma is generated under a low pressure or a rare gas atmosphere.

The prior art discloses a glow discharge-based plasma generating device and an air purifier, wherein the glow discharge plasma generating device comprises a rod-shaped spiral electrode and a high-voltage electrode, wherein the distance between the rod-shaped spiral electrode and the high-voltage electrode is 1cm to 10cm, and the high-voltage electrode is used for providing a directional external direct current electric field so that charged particles generated by the spiral rod-shaped electrode move directionally in space to generate ion wind, and discharge is still on the surface of the rod-shaped spiral electrode, so that the discharge area is small, the plasma density is small, and the air purifying effect is limited.

Disclosure of Invention

Therefore, the technical problem to be solved by the present invention is to overcome the defect that a plasma generating device in the prior art can only generate plasma on the surface of an electrode, so as to provide a plasma generating device, a plasma generating device and an air purifier which can realize glow discharge in a certain space, and can expand the purification range of the plasma generating device.

In order to solve the above problems, the present invention provides a plasma generating apparatus comprising: the spiral electrode comprises an inner electrode, an insulating layer wrapped outside the inner electrode and a carbon fiber electrode spirally wound outside the insulating layer, the inner electrode is suitable for being connected with an alternating current power supply, and the carbon fiber electrode is suitable for being grounded;

and the catalyst electrode is arranged on one side of the spiral electrode or arranged around the spiral electrode, the distance between the catalyst electrode and the spiral electrode is L, L is less than or equal to 5mm, the catalyst electrode is suitable for being connected with a direct-current power supply, and the catalyst electrode comprises an ozone removal catalyst.

Further, the catalyst electrode comprises an aluminum electrode and a catalyst layer of Mn, Ni, Co, Cu single or composite transition metal oxide coated on the aluminum electrode.

Further, a through hole is formed on the catalyst electrode.

Further, the aluminum electrode is an aluminum net formed by weaving aluminum wires, and the aluminum net is arranged on one side of the spiral electrode;

or the aluminum electrode is a cylindrical electrode formed by weaving aluminum wires, and the cylindrical electrode is arranged around the spiral electrode.

Further, the spiral electrode further comprises a pressing wire which is spirally wound on the insulating layer and pressed on the carbon fiber electrode, and the pressing wire is opposite to the spiral direction of the carbon fiber electrode.

Further, the press wire is made of polytetrafluoroethylene fibers.

Furthermore, the carbon fiber electrode comprises n carbon fiber filaments, wherein n is more than or equal to 20 and less than or equal to 1500.

Furthermore, the plasma generating device also comprises a first current limiting resistor connected with the inner electrode in series; and/or the presence of a gas in the gas,

a second current limiting resistor in series with the catalyst electrode.

Further, the inner electrode is a silver-plated copper wire.

Further, the material of the insulating layer is polytetrafluoroethylene.

Further, the plasma generating device comprises a plurality of generating unit groups, each generating unit group comprises a plurality of generating units which are connected in parallel, and each generating unit comprises a spiral electrode and a catalyst electrode which is arranged around the spiral electrode.

Further, two adjacent generating unit groups are arranged in a staggered manner.

Further, the plasma generating device comprises a plurality of generating units which are sequentially arranged at intervals, each generating unit comprises a spiral electrode group and a catalyst electrode arranged on one side of the spiral electrode group, and each spiral electrode group comprises a plurality of spiral electrodes which are arranged side by side at intervals.

Further, the plasma generating device comprises a plurality of generating units which are sequentially arranged at intervals, each generating unit comprises a catalyst electrode and a spiral electrode group which is correspondingly arranged, and each spiral electrode group comprises a plurality of spiral electrodes which are arranged side by side at intervals.

Further, the spiral electrode groups of two adjacent generating units are arranged in a staggered mode.

The second aspect of the invention relates to an air purifier, which comprises the plasma generating device provided by the first aspect of the invention.

The invention has the following advantages:

1. as can be seen from the above technical solutions, in the plasma generating apparatus according to the first aspect of the present invention, the catalyst electrode is additionally provided on one side of the spiral electrode, and the distance between the catalyst electrode and the spiral electrode is set to be less than 5 mm. The surface of the spiral electrode can generate uniform glow discharge, the catalyst electrode is connected with a direct current power supply, and the voltage formed on the surface of the spiral electrode can be led out to the catalyst electrode, so that glow discharge on a space is formed between the spiral electrode and the catalyst electrode under lower voltage, the discharge area of the plasma generating device is increased, and the discharge degree of the surface of the spiral electrode is increased to a certain extent. Because an electric field is formed between the catalyst electrode and the spiral electrode, when the airflow enters between the catalyst electrode and the spiral electrode, impurities carried in the airflow can be electrified when passing through a discharge area, and then are attached to the surface of the catalyst electrode under the action of the electric field, so that the air purification effect of the plasma generation device is further improved. The through holes can be beneficial to forming an electric field in the space, so that the spiral electrode and the catalyst electrode can generate uniform glow discharge. Meanwhile, the catalyst electrode can be used for removing ozone generated in the glow discharge process, the air purification effect of the plasma generating device is further improved, the activity of the catalyst on the catalyst electrode can be ensured by the plasma generated in the glow discharge process, and the service life of the catalyst electrode is prolonged.

Therefore, the catalyst electrode in the plasma generating device can be used as a direct current electrode to expand the purification range of the plasma generating device and adsorb particulate matters, and can also be used for removing ozone generated in the glow discharge process, so that the purification range of the plasma generating device can be expanded, and the air purification effect of the plasma generating device can be improved. In addition, the plasma generating device has the advantages of simple structure, easy manufacture, safe and reliable use and convenient implementation, popularization and application.

2. The air cleaner of the second aspect of the present invention includes or uses the plasma generation device of the first aspect of the present invention, and therefore has the technical effect of the plasma generation device of the first aspect of the present invention, that is, it is possible to generate glow discharge between the spiral electrode and the catalyst electrode, convert the glow discharge on the plane into glow discharge on the space, and effectively expand the cleaning range of the air cleaner without increasing the number of electrodes in the air cleaner. Meanwhile, the catalyst electrode can play a role in removing ozone generated in the glow discharge process, the purification range of the plasma generating device can be expanded, and the air purification effect of the plasma generating device is improved. In addition, the plasma generating device has the advantages of simple structure, easy manufacture, safe and reliable use and convenient implementation, popularization and application.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 shows a plasma generating apparatus according to example 1 of the present invention, in which a catalyst electrode is cylindrical;

FIG. 2 shows a plasma generating apparatus according to embodiment 1 of the present invention, and schematically shows a generating unit group of the plasma generating apparatus;

FIG. 3 shows the spiral electrode of the plasma generating apparatus according to embodiment 1 of the present invention;

FIG. 4 is a schematic diagram showing the arrangement of generating unit groups in the plasma generating apparatus according to embodiment 1 of the present invention;

fig. 5 shows a plasma generating apparatus according to embodiment 1 of the present invention, in which the catalyst electrode is in the form of a sheet.

Description of reference numerals:

100. a plasma generating device; 1. a helical electrode; 11. an inner electrode; 12. a carbon fiber electrode; 13. an insulating layer; 101. pressing the wire;

2. an aluminum mesh; 21. a through hole;

31. a first current limiting resistor; 32. a second current limiting resistor;

4. a cylindrical electrode.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

The plasma generation device 100 of the present embodiment mainly includes a spiral electrode 1 and a catalyst electrode. As shown in fig. 3, the spiral electrode 1 includes an inner electrode 11, an insulating layer 13 wrapped outside the inner electrode 11, and a carbon fiber electrode 12 spirally wound outside the insulating layer 13. The inner electrode 11 is adapted to be connected to an alternating current power supply. The carbon fiber electrode 12 is adapted to be grounded. The catalyst electrode is provided on one side of the spiral electrode 1. The distance between the catalyst electrode and the spiral electrode 1 is L, and L is less than or equal to 5 mm. The catalyst electrode is adapted to be connected to a dc power source. The catalyst electrode includes a catalyst for removing ozone. The catalyst electrode is preferably a catalyst layer which comprises an aluminum electrode and Mn, Ni, Co and Cu single or composite transition metal oxides coated on the aluminum electrode.

The dc power supply is adapted to provide a dc voltage of 0-8000v to the catalyst electrode. The AC power supply is adapted to provide an AC voltage of 500-4000v to the inner electrode 11. Preferably, the dc power supply is adapted to provide a dc voltage of 6000-.

As can be seen from the above technical solutions, the plasma generating apparatus 100 of the present embodiment is additionally provided with the catalyst electrode on one side of the spiral electrode 1, and the distance between the catalyst electrode and the spiral electrode 1 is set to be less than 5 mm. The surface of the spiral electrode 1 can generate uniform glow discharge, the catalyst electrode is connected with a direct current power supply, and the plasma formed on the surface of the spiral electrode 1 can be led out to the catalyst electrode, so that the glow discharge on the space is formed between the spiral electrode 1 and the catalyst electrode under lower voltage, the discharge area of the plasma generating device 100 is increased, and the discharge degree of the surface of the spiral electrode 1 is enhanced to a certain degree.

Because an electric field is formed between the catalyst electrode and the spiral electrode 1, when the airflow enters between the catalyst electrode and the spiral electrode 1, impurities carried in the airflow can be charged when passing through a discharge region, and then are attached to the surface of the catalyst electrode under the action of the electric field, which further improves the air purification effect of the plasma generation device 100 of the embodiment. The catalyst electrode may or may not be provided with a through hole 21. The through holes 21 can facilitate the formation of an electric field in the space, and promote the uniform glow discharge of the spiral electrode 1 and the catalyst electrode. Meanwhile, the catalyst electrode can be used for removing ozone generated in the glow discharge process, so that the air purification effect of the plasma generating device 100 is further improved, the activity of the catalyst on the catalyst electrode can be ensured by the plasma generated in the glow discharge process, and the service life of the catalyst electrode is prolonged.

Therefore, the catalyst electrode in the plasma generator 100 of the present embodiment can serve as a dc electrode to expand the purification range of the plasma generator 100 and adsorb particulate matter, and can also serve to remove ozone generated during glow discharge, thereby expanding the purification range of the plasma generator 100 and improving the air purification effect of the plasma generator 100. In addition, the plasma generating device 100 of the present embodiment has a simple structure, is easy to manufacture, is safe and reliable to use, and is convenient to implement, popularize and apply.

Carbon fiber is a semiconductor material, and compared with general metals, the carbon fiber has a relatively weak electron emission capability per unit volume (or per unit surface area), so that the amount of electrons released during discharge can be effectively controlled, and over-severe discharge can be prevented. And because the single filament of the carbon fiber has an extremely small curvature radius (the monofilament diameter is only 7-10 mu m). Under this condition, the actual discharge space around the carbon fiber electrode 12 is limited to a small size, so that a micro-discharge can be formed. In microdischarges at higher electric field strengths, the field emission effect of the carbon fiber electrode 12 becomes non-negligible. Under the action of stronger field emission, the discharge space is filled with a large amount of seed electrons, and the seed electrons appear to be used as an initial electron source of other electron bursts, so that the initial discharge voltage is effectively reduced, and the discharge is easy to realize under relatively low average field intensity; on the other hand, electrons are generated under a lower average electric field, which is beneficial to obtaining slowly-growing electrons, provides possibility for realizing stable glow discharge under atmospheric pressure, and inhibits the conversion of the electrons into filament discharge. Since the discharge of the carbon fiber electrode 12 is mainly generated on the surface of the insulating layer 13, when the number of carbon fibers in the carbon fiber bundle is too large, the discharge space is occupied, and the discharge area is reduced, therefore, the carbon fiber electrode 12 preferably comprises n carbon fiber filaments, wherein n is more than or equal to 20 and less than or equal to 1500.

The aluminum electrode is preferably, but not limited to, sheet-like (see fig. 5) or cylindrical (see fig. 1) in the shape of a cylinder. For example, when the aluminum electrode is selected as the aluminum mesh 2 woven from aluminum wires, the aluminum mesh 2 is preferably disposed on one side of the spiral electrode 1. The sheet-shaped aluminum electrode may be selected to be a sheet, and may also be selected to have a certain thickness, and the shape of the sheet-shaped aluminum electrode is preferably, but not limited to, a square, a circle, or other irregular patterns. The cross section of the aluminum mesh 2 can be linear or wavy. Preferably, when the cross section of the aluminum mesh 2 is wavy, the spiral electrode 1 can generate discharge in multiple directions with the catalyst electrode, and the discharge area between the spiral electrode 1 and the catalyst electrode can be increased.

As shown in fig. 2, the plasma generating apparatus 100 may optionally include one or more generating units arranged at intervals in sequence. The number of generating units can be adjusted according to the range of environment to be purified and the quality of air. Each generating unit comprises a catalyst electrode and a spiral electrode group which is correspondingly arranged. Each helical electrode group comprises a plurality of helical electrodes 1 arranged side by side and at intervals. A plurality of generating unit can carry out comparatively thorough purification to the air. Preferably, as shown in fig. 4, the spiral electrode groups of two adjacent generating units are staggered. The staggered spiral electrode groups can increase the contact area of the gas flow and the discharge space between the catalyst electrode and the spiral electrode 1, thereby promoting the plasma generation device 100 to more thoroughly disinfect and sterilize the gas flow. In addition, the adjacent generating units are arranged in a staggered manner, so that a blind zone is prevented from being formed in the plasma generating device 100, partial air flow is prevented from passing between the spiral electrodes 1 and not passing through a discharge zone, and the purification effect of the plasma generating device 100 is improved.

When the aluminum electrode is selected as the cylindrical electrode 4 woven from aluminum wires, as shown in fig. 1, the cylindrical electrode 4 is preferably disposed around the spiral electrode 1, and the cylindrical electrode 4 is preferably, but not limited to, a square cylinder, a circular cylinder, an oval cylinder, or the like. The cylindrical electrode 4 and the spiral electrode 1 can generate discharge in multiple directions, so that the discharge area of space discharge is further increased, the plasma density in a discharge space is improved, the number of the electrodes is reduced, and the power of an alternating current power supply is reduced. The through holes 21 can facilitate the formation of an electric field in the space, and promote the uniform glow discharge between the helical electrode 1 and the cylindrical electrode 4.

When the aluminum electrode is selected as the cylindrical electrode 4, the air cleaner preferably includes a plurality of generating unit groups in order to ensure high dust removal efficiency of the air cleaner. Each generating unit group comprises a plurality of generating units which are mutually connected in parallel. Each generation unit includes a spiral electrode 1 and a catalyst electrode disposed around the spiral electrode 1. Two adjacent generating unit groups are arranged in a staggered mode. The staggered spiral electrode groups can increase the contact area of the gas flow and the discharge space between the catalyst electrode and the spiral electrode 1, thereby promoting the plasma generation device 100 to more thoroughly disinfect and sterilize the gas flow. In addition, a blind zone can be avoided in the plasma generation device 100, and partial air flow can be avoided from passing between the spiral electrodes 1 without passing through a discharge zone, which is beneficial to improving the purification effect of the plasma generation device 100.

In the present embodiment, the through holes 21 on the catalyst electrode are preferably, but not limited to, obtained by punching, or formed by weaving aluminum wires. For example, when the aluminum electrode is selected as the aluminum mesh 2 formed by weaving aluminum wires, the dense through holes 21 are beneficial to forming a uniform electric field in the space, so that each spiral electrode 1 can generate good uniform glow discharge with the catalyst electrode. The discharge in the space is generated in the metal portions of the helical electrode 1 and the catalyst electrode. In order to ensure that the aluminum mesh 2 has a large discharge area, the aperture of the aluminum mesh 2 is preferably less than 5mm, preferably less than 2 mm. For example, when the catalyst electrode is selected as the aluminum mesh 2 woven by aluminum wires, the diameter of the aluminum wires in the aluminum mesh 2 is D6, and D6 is more than or equal to 0.15mm and less than or equal to 0.25 mm. The aperture of the catalyst electrode is D7, and D7 is more than or equal to 1mm and less than or equal to 2 mm. When the catalyst electrode is selected to be the punched aluminum net 2, the aperture of the through hole 21 of the catalyst electrode is D8, and D8 is more than or equal to 1mm and less than or equal to 2 mm. The distance between the middle holes of the catalyst electrodes is D9, and the distance D9 is more than or equal to 2mm and less than or equal to 4 mm. Preferably, the cathode of the direct current power supply is connected with the catalyst electrode, and the anode is grounded. Compared with the mode that the anode is connected with the catalyst electrode and the cathode is grounded, the glow discharge generated by the mode that the cathode of the direct-current power supply is connected with the catalyst electrode is more uniform, the filament discharge is not easy to generate, the manufacturing requirement on the electrode is lower, the safety of the plasma generating device 100 is improved, the rejection rate of the electrode is reduced, and the manufacturing cost of the plasma generating device 100 is reduced.

In this embodiment, the spiral electrode 1 structure further includes a pressed wire 101 that is spirally wound on the insulating layer 13 and pressed on the carbon fiber electrode 12. The pressing line 101 is opposite to the spiral direction of the carbon fiber electrode 12. Pressing outside carbon fiber electrode 12 through pressing the winding of system line 101, can suppressing the burr of carbon fiber electrode 12 surface effectively, avoid the sharp-pointed discharge breakdown phenomenon of burr to take place to make discharge more even, prolonged the life-span of spiral electrode 1 structure, also avoided the burr to discharge simultaneously and produced too much idle work, the problem of the efficiency of influence discharging.

The pressed line 101 is made of an insulating material or a semiconductive material. Preferably, the pressed wire 101 in this embodiment is made of a nanoscale insulating material. Compared with the adoption of a conductive material, the discharge intensity of the whole electrode is easier to control, the pressing wire 101 does not participate in discharge, and the influence and the interference of the pressing wire 101 on the discharge of the structure of the spiral electrode 1 can be greatly reduced. Optionally, the pressing line 101 is any one of polytetrafluoroethylene fiber, polyamide fiber, and aramid fiber. Or, the pressed line 101 is made of one or more of a fluorine fiber line, a fine nylon line and an aramid fiber line. Of course, the pressing line 101 is not limited to the above-described material, and may be another insulating material.

Most preferably, the press wire 101 is a polytetrafluoroethylene fiber due to the good ability of the polytetrafluoroethylene fiber material to adsorb and release electrons. In the embodiment, the glow discharge generated by the structure of the helical electrode 1 is dielectric barrier discharge, and the pressing line 101 is made of an insulated polytetrafluoroethylene fiber material, so that the pressing line has good capability of adsorbing and releasing electrons, can adsorb electrons in the alternating current positive half-cycle discharge process, provides electrons for negative half-cycle discharge, is favorable for discharge, and avoids the influence on the electrode discharge uniformity after the carbon fiber electrode 12 is pressed. The better the ability of the pressed wire 101 to attract and release electrons, the better the electrical discharge produced.

In the present embodiment, the pressing wire 101 is preferably a wire bundle with a small diameter, and is tightly wound around the outer surface of the carbon fiber electrode 12 to press burrs on the surface of the carbon fiber electrode 12. Setting the diameter of the pressing wire 101 to be small can prevent the pressing wire 101 from wrapping the surface of the carbon fiber electrode 12, which would result in hindering the discharge of the carbon fiber electrode 12. Preferably, the press line 101 has a diameter D5,0.005 mm. ltoreq. D5. ltoreq.3 mm. For example, in the present embodiment, polytetrafluoroethylene fibers having a diameter of 0.1mm are used for the press wire 101. Of course, the pressing lines 101 may be two or more to improve the pressing effect.

In this embodiment, the inner electrode 11 is made of a conductive material. Optionally, the inner electrode 11 is a metal conductive rod, and the cross section of the inner electrode 11 is circular, oval, rectangular or other polygonal shape. Preferably, the inner electrode 11 is circular in cross-section. Preferably, the inner electrode 11 is a silver-plated copper wire, and the inner electrode 11 has a better conductive effect due to the adoption of the silver-plated copper wire. The diameter of the inner electrode 11 is D10, D10 is more than or equal to 1mm and less than or equal to 1.4 mm.

The material of the insulating layer 13 is preferably, but not limited to, polytetrafluoroethylene, polyamide, aramid, or the like. Preferably polytetrafluoroethylene. The thickness of the polytetrafluoroethylene layer is D4, and D4 is more than or equal to 0.15mm and less than or equal to 0.3 mm. When the thickness of the teflon insulating layer 13 is within the above range, the spiral electrode 1 structure has a low corona-starting voltage, and the insulating layer 13 is not easily broken down. For example, in the present embodiment, the insulating layer 13 is made of 0.2mm thick teflon, and the teflon can be uniformly sprayed on the outer surface of the inner electrode 11 by a spraying process to form the insulating layer 13.

Alternatively, the carbon fiber electrode 12 is spirally wound from one end to the other end of the inner electrode 11, and the pressing wire 101 is reversely wound and pressed against the outside of the carbon fiber electrode 12. The pressed wire 101 is also spirally wound from one end of the inner electrode 11 to the other end in the opposite direction to the carbon fiber electrode 12. The pressing line 101 is pressed by adopting the reverse winding mode, so that the operation is convenient, the pressing line 101 is not easy to separate from the carbon fiber electrode 12, and the pressing effect is more reliable.

Optionally, the pitch of the winding of the carbon fiber electrode 12 is set to D1, and the pitch of the winding of the pressing wire 101 is set to D2, wherein: 1/2D1 is not less than D2 is not less than D1. The range of the spiral pitch D2 of the winding of above-mentioned suppression line 101 is the optimum range that obtains through a large amount of experiments, D2 when being in this scope, the discharge effect is the best, can avoid effectively the spiral pitch overlength of suppression line 101, the winding is too sparse can not play good suppression effect, produces more burr, can avoid the spiral pitch of suppression line 101 too short again, and the winding too compact can influence carbon fiber electrode 12 and normally discharge.

In this embodiment, the diameter of the pressing wire 101 is as small as possible, and the pressing wire 101 is wound around the carbon fiber electrode 12 according to a set pitch range, so that the carbon fiber electrode 12 is not completely wrapped while burrs can be effectively suppressed, and the carbon fiber electrode 12 is still partially exposed in an external environment, thereby effectively ensuring that glow discharge can be realized by using the characteristics of the carbon fiber material of the spiral electrode 1 structure, and normal discharge of the spiral electrode 1 structure is not affected.

Preferably, the pitch of the winding of the pressed wire 101 is equal to the pitch of the carbon fiber electrode 12, or is half of the pitch of the carbon fiber electrode 12.

Optimally, the pitch of the winding of the pressed wire 101 is equal to the pitch of the carbon fiber electrode 12. And the winding angle of the pressed wire 101 is the same as that of the carbon fiber electrode 12. Through the design, the pressing line 101 can be reliably pressed outside the carbon fiber electrode 12, so that the generation of burrs is effectively inhibited, and meanwhile, the influence on the normal discharge of the carbon fiber electrode 12 can be avoided.

Specifically, the pressing line 101 is tightly pressed outside the carbon fiber electrode 12, and two ends of the pressing line are respectively provided with at least one extra circle, the extra circle is directly wound and fixed outside the insulating layer 13, and is adhered and fixed on the inner electrode 11 through an adhesive or glue or an adhesive tape, so that the pressing line 101 can be stably fixed on the electrode and cannot fall off, and the pressing line is firmly pressed outside the carbon fiber electrode 12.

In the present embodiment, the plasma generation device 100 preferably further includes a first current limiting resistor 31 connected in series with the inner electrode 11; and/or a second current limiting resistor 32 in series with the catalyst electrode. The current limiting resistor is beneficial to preventing the generation of arc discharge, so that good glow discharge is generated between the spiral electrode 1 and the catalyst electrode.

Example 2

The present embodiment relates to an air cleaner including the plasma generation device 100 according to embodiment 1.

As described above, the plasma generation device 100 according to embodiment 1 and the air cleaner according to embodiment 2 can generate glow discharge in the space between the spiral electrode 1 and the catalyst electrode, thereby greatly increasing the discharge area of the plasma generation device, effectively extending the cleaning range of the plasma generation device without increasing the number of electrodes in the plasma generation device, and contributing to reduction of power consumption of the plasma generation device. Meanwhile, the plasma generating device 100 of the embodiment 1 and the air purifier of the embodiment 2 also have a dust collecting effect and have better capability of removing particulate matters.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims

1. A plasma generating apparatus, comprising:

the spiral electrode (1) comprises an inner electrode (11), an insulating layer (13) wrapping the outer portion of the inner electrode (11) and a carbon fiber electrode (12) spirally wound on the outer portion of the insulating layer (13), wherein the inner electrode (11) is suitable for being connected with an alternating current power supply, and the carbon fiber electrode (12) is suitable for being grounded;

the catalyst electrode is arranged on one side of the spiral electrode (1) or arranged around the spiral electrode (1), the distance between the catalyst electrode and the spiral electrode (1) is L, L is less than or equal to 5mm, the catalyst electrode is suitable for being connected with a direct-current power supply, and the catalyst electrode comprises an ozone removal catalyst.

2. The plasma generator of claim 1, wherein the catalyst electrode comprises an aluminum electrode and a catalyst layer of Mn, Ni, Co, Cu single or composite transition metal oxide coated on the aluminum electrode.

3. The plasma generating apparatus according to claim 2, wherein the catalyst electrode is formed with a through hole (21).

4. The plasma generating device according to claim 3, characterized in that the aluminum electrode is an aluminum mesh (2) formed by weaving aluminum wires, and the aluminum mesh (2) is arranged on one side of the spiral electrode (1);

or the aluminum electrode is a cylindrical electrode (4) formed by weaving aluminum wires, and the cylindrical electrode (4) is arranged around the spiral electrode (1).

5. A plasma-generating device according to claim 1, characterised in that the spiral electrode (1) further comprises a pressed wire (101) which is spirally wound on the insulating layer (13) and pressed against the carbon fibre electrode (12), the pressed wire (101) being in the opposite direction to the spiral direction of the carbon fibre electrode (12).

6. Plasma-generating device according to claim 5, characterized in that the pressing wire (101) is made of polytetrafluoroethylene fibers.

7. A plasma-generating device as claimed in claim 1, characterized in that the carbon-fibre electrode (12) comprises n carbon-fibre filaments, 20 ≦ n ≦ 1500.

8. A plasma-generating device according to any of claims 1 to 7, characterized in that it further comprises a first current-limiting resistor (31) connected in series with said inner electrode (11); and/or the presence of a gas in the gas,

a second current limiting resistor (32) in series with the catalyst electrode.

9. Plasma-generating device according to one of claims 1 to 7, characterized in that the inner electrode (11) is a silver-plated copper wire.

10. Plasma-generation device according to any one of claims 1 to 7, characterised in that the material of the insulating layer (13) is polytetrafluoroethylene.

11. The plasma generating device according to any of claims 1 to 7, characterized in that the plasma generating device (100) comprises a plurality of generating unit groups, each generating unit group comprises a plurality of generating units connected in parallel with each other, each generating unit comprises a spiral electrode (1) and a catalyst electrode arranged around the spiral electrode (1).

12. The plasma generating device according to claim 11, wherein two adjacent generating unit groups are arranged in a staggered manner.

13. A plasma-generating device according to any of claims 1 to 7, characterized in that the plasma-generating device (100) comprises a plurality of generating units arranged at intervals in sequence, each generating unit comprises a spiral electrode group and a catalyst electrode arranged at one side of the spiral electrode group, and each spiral electrode group comprises a plurality of spiral electrodes (1) arranged side by side and at intervals.

14. The plasma generating apparatus according to claim 13, wherein the spiral electrode groups of two adjacent generating units are staggered.

15. An air purifier, characterized in that it comprises a plasma-generating device (100) according to any one of claims 1 to 14.