WO2023207155A1 - Plasma generation device and air purifier - Google Patents

Abstract

A plasma generation device (100) and an air purifier. The plasma generation device (100) comprises: a spiral electrode (1) comprising an inner electrode (11), an insulating layer (13) wrapping the inner electrode (11), and a carbon fiber electrode (12) spirally wound outside the insulating layer (13), wherein the inner electrode (11) is connected to an alternating current power supply, and the carbon fiber electrode (12) is grounded; and a direct-current electrode (2) provided on one side of the spiral electrode (1), wherein the distance between the direct-current electrode (2) and the spiral electrode (1) is L, L≤5 mm, the direct-current electrode (2) is connected to a direct-current power supply, and a through hole (21) is formed in the direct-current electrode (2). The plasma generation device (100) can generate glow discharge between the spiral electrode (1) and the direct-current electrode (2), such that glow discharge on the plane is converted into glow discharge in space, and the purification range of the plasma generation device (100) can be effectively expanded without increasing the number of electrodes in the plasma generation device (100). Moreover, the plasma generation device (100) also has the dust collection effect, and has a good capability of removing particulate matters.

Description

Plasma generating device and air purifier

This application requests the priority of the patent application submitted to the State Intellectual Property Office of China on April 29, 2022, with the application number 202210475850.1 and the invention title "A plasma generating device and air purifier".

Technical field

The present application relates to the technical field of air purification equipment, and specifically relates to a plasma generating device and an air purifier.

Background technique

With the development of social economy, residents have higher and higher requirements for residential interior decoration. The large-scale use of decoration materials and building materials has caused the concentration of formaldehyde, TVOC and other pollutants in indoor air to exceed standards, which has had an impact on people's health. At present, indoor air pollution purification methods include ventilation method, plant purification method, microbial method, physical and chemical adsorption method, plasma method, etc.

Due to the presence of high-energy electrons, excited particles and active groups in low-temperature plasma, plasma discharge can effectively catalyze the degradation of harmful gases. Therefore, it is increasingly used in fields such as air purification. Plasma discharge includes corona discharge and glow discharge. Due to the large discharge area and high plasma density of glow discharge, it has good application prospects. Under normal circumstances, glow discharge plasma is mostly generated in a low pressure or rare gas environment.

The prior art discloses a glow discharge plasma generating device and an air purifier. The glow discharge plasma generating device includes a rod-shaped spiral electrode and a high-voltage electrode. The distance between the rod-shaped spiral electrode and the high-voltage electrode is 1 cm to 10cm, the function of the high-voltage electrode is to provide a directional external DC electric field, so that the charged particles generated by the spiral rod-shaped electrode move directionally in space, generating ion wind, while the discharge is still on the surface of the rod-shaped spiral electrode, the discharge area is small, and the plasma density is small , so the air purification effect is limited.

Contents of the invention

Therefore, the technical problem to be solved by this application is to overcome the defect that a plasma generating device in the prior art can only generate plasma on the surface of an electrode, thereby providing a plasma that can realize glow discharge in a certain space. The plasma generating device and the air purifier can expand the purification range of a plasma generating device.

In order to solve the above problems, the present application provides a plasma generating device, which includes a spiral electrode, an inner electrode, an insulating layer wrapped around the inner electrode, and a carbon fiber electrode spirally wrapped around the insulating layer. The inner electrode is suitable for connecting to an AC power supply. The carbon fiber electrode is suitable for grounding; the DC electrode is located on one side of the spiral electrode. The distance between the DC electrode and the spiral electrode is L, L≤5mm. The DC electrode is suitable for connecting to the DC power supply. A pass is formed on the DC electrode. hole.

Further, the DC electrode is a metal mesh formed by braiding metal wires.

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

Further, the pressed wire is made of polytetrafluoroethylene fiber.

Further, the carbon fiber electrode includes n carbon fiber filaments, 20≤n≤1500.

Further, the plasma generating device further includes a first current limiting resistor connected in series with the internal electrode; and/or,

A second current limiting resistor in series with the DC electrode.

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

Further, the material of the insulating layer is polytetrafluoroethylene.

Further, the cross section of the DC electrode is wavy.

Further, the plasma generating device includes a plurality of generating units arranged at intervals in sequence. Each generating unit includes a DC electrode and a corresponding spiral electrode group. Each spiral electrode group includes a plurality of spiral electrodes arranged side by side and spaced apart.

The second aspect of this application relates to an air purifier, including the plasma generating device provided in the first aspect of this application.

This application has the following advantages:

1. It can be seen from the above technical solution that the plasma generating device of the first aspect of the present application adds a DC electrode on one side of the spiral electrode, and the distance between the DC electrode and the spiral electrode is set to less than 5 mm. Among them, the surface of the spiral electrode can produce uniform glow discharge, and the DC electrode is connected to a DC power supply, which can lead the voltage formed on the surface of the spiral electrode to the DC electrode, thereby forming a space between the spiral electrode and the DC electrode at a lower voltage. The glow discharge increases the discharge area of the plasma generating device and increases the discharge degree on the surface of the spiral electrode to a certain extent. Due to the electric field formed between the DC electrode and the spiral electrode, when the air flow enters between the DC electrode and the spiral electrode, the impurities carried in the air flow can be charged when passing through the discharge area, and then adhere to the surface of the DC electrode under the action of the electric field. This further improves the air purification effect of the plasma generating device of the present application. The through hole can help form an electric field in the space, allowing the spiral electrode to produce a uniform glow discharge with the DC electrode.

Therefore, the plasma generating device of the present application can generate glow discharge between the spiral electrode and the DC electrode, and convert the glow discharge on the plane into the glow discharge on the space at a lower voltage, without increasing the plasma generation. When the number of electrodes in the device is reduced, the purification range of the plasma generating device can be effectively expanded, and the power consumption of the plasma generating device can be reduced. At the same time, the plasma generating device of the present application also has a dust collection effect and has a good ability to remove particulate matter. In addition, the plasma generating device of the present application has a simple structure, is easy to manufacture, is safe and reliable to use, and is easy to implement, promote and apply.

2. The air purification device of the second aspect of the present application includes or uses the plasma generating device of the first aspect of the present application. Therefore, it has the technical effect of the plasma generating device of the first aspect of the present application, that is, it can combine the spiral electrode and the direct current. Glow discharge is generated between the electrodes, so that the glow discharge on the plane is converted into a glow discharge on the space, which can effectively expand the purification range of other air purifiers without increasing the number of electrodes in the air purifier. At the same time, the air purification device of the present application also has a dust collection effect and has a good ability to remove particulate matter. In addition, the air purification device of the present application has a simple structure, is easy to manufacture, is safe and reliable to use, and is easy to implement, promote and apply.

Description of the drawings

In order to more clearly explain the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description The drawings illustrate some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 shows a plasma generating device according to Embodiment 1 of the present application;

FIG. 2 shows the spiral electrode of the plasma generating device according to Embodiment 1 of the present application.

Explanation of reference symbols:

100. Plasma generating device; 1. Spiral electrode; 11. Internal electrode; 12. Carbon fiber electrode; 13. Insulating layer; 101. Pressing wire;

2. DC electrode; 21. Through hole;

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

Detailed ways

The technical solution of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this application.

In the description of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation or a specific orientation. construction and operation, and therefore should not be construed as limitations on this application. 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 this application, it should be noted that, unless otherwise clearly stated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. Connection, or integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

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

The plasma generating device 100 of this embodiment mainly includes a spiral electrode 1 and a direct current electrode 2, as shown in Figures 1 and 2. The spiral electrode 1 includes an inner electrode 11 , an insulating layer 13 wrapped around the inner electrode 11 , and a carbon fiber electrode 12 spirally wound around the insulating layer 13 . The inner electrode 11 is adapted to be connected to an AC power source. The carbon fiber electrode 12 is suitable for grounding. The DC electrode 2 is provided on one side of the spiral electrode 1 . The distance between the DC electrode 2 and the spiral electrode 1 is L, L≤5mm. The DC electrode 2 is suitable for connection with a DC power source. A through hole 21 is formed in the DC electrode 2 . The DC electrode 2 may be in the shape of a sheet or may have a certain thickness. The shape of the DC electrode 2 is preferably but not limited to square, circular or other irregular shapes. The cross section of the DC electrode 2 may be linear or wavy. Preferably, when the cross-section of the DC electrode 2 is wavy, the spiral electrode 1 can generate discharges in multiple directions with the DC electrode 2 and can increase the discharge area between the spiral electrode 1 and the DC electrode 2 .

The DC power supply is suitable for providing a DC voltage of 0-8000v to the DC electrode 2 . The AC power supply is suitable for providing an AC voltage of 500-4000v to the inner electrode 11 . Preferably, the DC power supply is suitable for providing a DC voltage of 6000-7000v to the DC electrode 2, and the AC power supply is suitable for providing an AC voltage of 1600-1800v to the inner electrode 11. The above voltage range is the best range obtained through a large number of experiments. When When the voltage is within the above range, the glow discharge effect will not be affected due to the voltage being too small, nor will the discharge develop into a violent filamentous discharge.

It can be seen from the above technical solution that the plasma generating device 100 of this embodiment adds a DC electrode 2 on one side of the spiral electrode 1, and the distance between the DC electrode 2 and the spiral electrode 1 is set to less than 5 mm. Among them, the surface of the spiral electrode 1 can produce a uniform glow discharge, and the DC electrode 2 is connected to a DC power supply, which can lead the plasma formed on the surface of the spiral electrode 1 to the DC electrode 2, so that the spiral electrode 1 and the DC current can be connected at a lower voltage. A spatial glow discharge is formed between the electrodes 2, which increases the discharge area of the plasma generating device 100 and at the same time enhances the discharge degree on the surface of the spiral electrode 1 to a certain extent. Due to the electric field formed between the DC electrode 2 and the spiral electrode 1, when the air flow enters between the DC electrode 2 and the spiral electrode 1, the impurities carried in the air flow can be charged when passing through the discharge area, and then adhere to the surface under the action of the electric field. DC electrode surface, which further improves the air purification effect of the plasma generating device 100 of this embodiment. The through hole 21 can facilitate the formation of an electric field in the space, so that the spiral electrode 1 and the DC electrode 2 can generate uniform glow discharge.

Therefore, the plasma generating device 100 of this embodiment can generate glow discharge between the spiral electrode 1 and the DC electrode 2, convert the glow discharge on the plane into the glow discharge on the space at a lower voltage, and can The purification range of the plasma generating device 100 is effectively increased without increasing the number of electrodes in the plasma generating device 100. At the same time, the plasma generating device of this embodiment also has a dust collection effect and has better ability to remove particulate matter. . In addition, the plasma generating device 100 of this embodiment has a simple structure, is easy to manufacture, is safe and reliable to use, and is easy to implement, promote and apply.

Carbon fiber is a kind of semiconductor material. Compared with ordinary metals, the electron escape ability of carbon fiber per unit volume (or unit surface area) is relatively weak. Therefore, the number of electrons released during the discharge process can be effectively controlled, thereby preventing the discharge from being too violent. . And because a single filament of carbon fiber has a very small radius of curvature (its single filament diameter is only 7 to 10 μm). Under this condition, the actual discharge space around the carbon fiber electrode 12 is limited to a smaller size, allowing micro-discharge to be formed. In the micro-discharge under higher electric field intensity, the field emission effect of the carbon fiber electrode 12 becomes non-negligible. Under the action of strong field emission, the discharge space is filled with a large number of seed electrons. The emergence of these seed electrons, on the one hand, serves as the initial source of electrons for other electron avalanches, effectively reducing the initial discharge voltage, making the discharge at a relatively low level. It is easy to realize under the average field strength of transformation. 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, it will occupy the discharge space and reduce the discharge area. Therefore, the carbon fiber electrode 12 preferably includes n carbon fiber filaments, 20≤n ≤1500.

Preferably, in this embodiment, the DC electrode 2 is preferably, but not limited to, made of a punched metal mesh, or a metal mesh formed of woven metal wires, or the like. When the DC electrode 2 is selected as a metal mesh formed by woven metal wires, the dense through holes 21 are conducive to forming a more uniform electric field in the space, so that each spiral electrode 1 can produce better uniform radiance with the DC electrode 2 Light discharge. The discharge in the space is generated from the metal parts of the spiral electrode 1 and the DC electrode 2 . In order to ensure that the metal mesh has a large discharge area, the aperture of the metal mesh is preferably less than 5 mm, preferably less than 2 mm. For example, when the DC electrode 2 is selected as a metal mesh woven from metal wires, the diameter of the metal wires in the metal mesh is D6, 0.15mm≤D6≤0.25mm. The aperture of the DC electrode 2 is D7, 1mm≤D7≤2mm. When the DC electrode 2 is selected as a punched metal mesh, the diameter of the through hole 21 of the DC electrode 2 is D8, 1mm≤D8≤2mm. The distance between the holes of DC electrode 2 is D9, 2mm≤D9≤4mm. Preferably, the negative electrode of the DC power supply is connected to the DC electrode 2 and the positive electrode is grounded. Compared with the method in which the positive electrode is connected to the DC electrode 2 and the negative electrode is grounded, the glow discharge generated by using the negative electrode of the DC power supply to be connected to the DC electrode 2 is more uniform, is less likely to produce filamentous discharge, and has lower requirements for electrode production. , which helps to improve the safety of the plasma generating device 100, reduce the rejection rate of the electrodes, and reduce the manufacturing cost of the plasma generating device 100.

In this embodiment, the spiral electrode 1 structure also includes a pressed wire 101 , which is spirally wound on the insulating layer 13 and pressed on the carbon fiber electrode 12 . The spiral direction of the pressing line 101 is opposite to that of the carbon fiber electrode 12 . By winding and pressing the pressing wire 101 outside the carbon fiber electrode 12, the burrs on the outer surface of the carbon fiber electrode 12 can be effectively suppressed and the discharge breakdown phenomenon at the burr tip can be avoided, thereby making the discharge more uniform, extending the service life of the spiral electrode 1 structure, and also This avoids the problem of excessive useless work generated by glitch discharge and affecting discharge energy efficiency.

The pressing wire 101 is made of insulating material or semi-conductive material. Preferably, the pressed wire 101 in this embodiment is made of nanoscale insulating material. Compared with using conductive materials, the discharge intensity of the entire electrode is easier to control, and the pressing wire 101 will not participate in the discharge, which can greatly reduce the influence and interference of the pressing wire 101 on the discharge of the spiral electrode 1 structure. Optionally, the pressing line 101 is any one of polytetrafluoroethylene fiber, polyamide fiber, and aramid fiber. In other words, the pressing line 101 adopts one or more of fluoron thread, fine nylon thread, and aramid thread. Of course, the pressed wire 101 is not limited to the above materials, and can also be made of other insulating materials.

Optimally, the pressed wire 101 is polytetrafluoroethylene fiber, because the polytetrafluoroethylene fiber material has good ability to absorb and release electrons. In this embodiment, the spiral electrode 1 structure generates glow discharge by means of dielectric barrier discharge. The pressing wire 101 is made of insulating polytetrafluoroethylene fiber material, which has good ability to adsorb and release electrons and can discharge during the positive half cycle of AC. It absorbs electrons and provides electrons for the discharge in the negative half cycle, which is conducive to the occurrence of discharge and prevents the carbon fiber electrode 12 from being suppressed and affecting the uniformity of the electrode discharge. The better the ability of the suppression wire 101 to absorb and release electrons, the better the discharge produced.

In this embodiment, the pressing wire 101 is preferably a wire bundle with a smaller diameter, and is tightly wound around the outer surface of the carbon fiber electrode 12 to suppress burrs on the surface of the carbon fiber electrode 12 . Setting the diameter of the pressing wire 101 to be smaller can prevent the pressing wire 101 from wrapping the surface of the carbon fiber electrode 12 and hindering the discharge of the carbon fiber electrode 12 . Preferably, the pressing line 101 has a diameter of D5, 0.005mm≤D5≤3mm. For example, in this embodiment, the pressing line 101 uses polytetrafluoroethylene fiber with a diameter of 0.1 mm. Of course, there can also be two or more pressing lines 101 to improve the pressing effect.

In this embodiment, the internal electrode 11 is made of conductive material. Optionally, the internal electrode 11 is a metal conductive rod, and the cross section of the internal electrode 11 is circular, elliptical, rectangular or other polygonal shape. Preferably, the internal electrode 11 has a circular cross-section. Preferably, the internal electrode 11 is a silver-plated copper wire, and the internal electrode 11 is made of silver-plated copper wire for better electrical conductivity. The diameter of the internal electrode 11 is D10, 1mm≤D10≤1.4mm.

The material of the insulating layer 13 is preferably but not limited to polytetrafluoroethylene, polyamide or aramid. Polytetrafluoroethylene is preferred. The thickness of the polytetrafluoroethylene layer is D4, 0.15mm≤D4≤0.3mm. When the thickness of the polytetrafluoroethylene insulating layer 13 is within the above range, the structure of the spiral electrode 1 has a lower corona voltage, and the insulating layer 13 is not easily broken down. For example, in this embodiment, the insulating layer 13 is selected to be polytetrafluoroethylene with a thickness of 0.2 mm. The polytetrafluoroethylene can be evenly sprayed on the outer surface of the inner electrode 11 through a spraying process to form the insulating layer 13 .

Optionally, the carbon fiber electrode 12 is spirally wound from one end of the inner electrode 11 to the other end, and the pressing wire 101 is wound in the opposite direction and pressed tightly on the outside of the carbon fiber electrode 12 . The pressing wire 101 is also spirally wound from one end of the inner electrode 11 to the other end, and the winding direction is opposite to the winding direction of the carbon fiber electrode 12 . The pressing wire 101 adopts the reverse winding and pressing method, which is not only convenient for operation, but also the pressing wire 101 is not easy to separate from the carbon fiber electrode 12, and the pressing effect is more reliable.

Optionally, set the winding pitch of the carbon fiber electrode 12 to D1 and the winding pitch of the pressing wire 101 to D2, where: 1/2D1≤D2≤D1. The range of the pitch D2 wound by the above-mentioned pressing wire 101 is the optimal range obtained through a large number of experiments. When D2 is in this range, the discharge effect is the best, which can effectively prevent the pitch of the pressing wire 101 from being too long and winding too much. Sparseness cannot achieve a good suppressing effect and generates more burrs. It also prevents the pitch of the suppressing wire 101 from being too short, and winding it too tightly will affect the normal discharge of the carbon fiber electrode 12.

In this embodiment, the smaller the diameter of the pressing wire 101 is, the better, and the pressing wire 101 is wound around the carbon fiber electrode 12 according to a set pitch range, which can effectively suppress burrs while not completely wrapping the carbon fiber electrode 12, making the carbon fiber The electrode 12 will still be partially exposed to the external environment, which can effectively ensure that the spiral electrode 1 structure can utilize the characteristics of the carbon fiber material itself to achieve glow discharge without affecting the normal discharge of the spiral electrode 1 structure.

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

Optimally, the helical pitch of the pressing wire 101 is equal to the helical pitch of the carbon fiber electrode 12 . And the winding angle of the pressing wire 101 is the same as the winding angle of the carbon fiber electrode 12 . Through the above design, the pressing wire 101 can be reliably pressed outside the carbon fiber electrode 12 , effectively suppressing the generation of burrs, and also avoiding affecting the normal discharge of the carbon fiber electrode 12 .

Specifically, the pressed wire 101 is tightly pressed outside the carbon fiber electrode 12, and has at least one extra turn at both ends. The extra turn is directly wound and fixed outside the insulating layer 13, and is adhered by adhesive, glue or adhesive tape. It is connected and fixed on the insulating layer 13 to ensure that the pressed wire 101 can be stably fixed on the insulating layer 13 and will not fall off, so that it can be firmly pressed outside the carbon fiber electrode 12 .

In this embodiment, the plasma generating 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 connected in series with the DC electrode 2 . The current-limiting resistor is helpful to prevent the occurrence of arc discharge, so that a good glow discharge can be generated between the spiral electrode 1 and the DC electrode 2.

In this embodiment, the plasma generating device 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 scope of the environment that needs to be purified and the quality of the air. Each generating unit includes a DC electrode 2 and a corresponding spiral electrode group. Each spiral electrode group includes a plurality of spiral electrodes 1 arranged side by side and spaced apart. Multiple generating units can purify the air more thoroughly. Preferably, the spiral electrode groups of two adjacent generating units are arranged in a staggered manner. The staggered spiral electrode groups can increase the contact area between the airflow and the discharge space between the DC electrode 2 and the spiral electrode 1, thereby promoting the plasma generating device 100 to more thoroughly disinfect and sterilize the airflow. In addition, staggering adjacent generating units can avoid the formation of blind areas in the plasma generating device 100 and prevent part of the airflow from passing between the spiral electrodes 1 without passing through the discharge area, which helps to improve the purification effect of the plasma generating device 100 .

Example 2

This embodiment relates to an air purifier, including the plasma generating device 100 involved in Embodiment 1.

To sum up, the plasma generating device 100 of Embodiment 1 and the air purifying device of Embodiment 2 can generate spatial glow discharge between the spiral electrode 1 and the DC electrode, greatly increasing the discharge area of the plasma generating device. , can effectively expand the purification range of the plasma generating device without increasing the number of electrodes in the plasma generating device, and help reduce the power consumption of the plasma generating device. At the same time, the plasma generating device 100 of Embodiment 1 and the air purifying device of Embodiment 2 also have dust collection effects and have better ability to remove particulate matter.

Obviously, the above-mentioned embodiments are only examples for clear explanation and are not intended to limit the implementation. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. An exhaustive list of all implementations is neither necessary nor possible. The obvious changes or modifications derived therefrom are still within the scope of protection created by this application.

Claims (14)

1. A plasma generating device, characterized in that it includes:

   The spiral electrode (1) includes an internal electrode (11), an insulating layer (13) wrapped around the internal electrode (11), and a carbon fiber electrode (12) spirally wound around the insulating layer (13). The inner electrode (11) is suitable for connection with the AC power supply, and the carbon fiber electrode (12) is suitable for grounding;

   A DC electrode (2) is provided on one side of the spiral electrode (1). The distance between the DC electrode (2) and the spiral electrode (1) is L, L≤5mm. The DC electrode (2) Suitable for connection with a DC power supply, a through hole (21) is formed on the DC electrode (2).
2. The plasma generating device according to claim 1, characterized in that the DC electrode (2) is a metal mesh formed by braiding metal wires.
3. The plasma generating device according to claim 2, characterized in that the spiral electrode (1) further includes a pressing wire (101), which is spirally wound on the insulating layer (13) and pressed on the carbon fiber electrode. (12), the spiral direction of the pressing line (101) is opposite to that of the carbon fiber electrode (12).
4. The plasma generating device according to claim 3, characterized in that the pressing wire (101) is made of polytetrafluoroethylene fiber.
5. The plasma generating device according to claim 1, characterized in that the carbon fiber electrode (12) includes n carbon fiber filaments, 20≤n≤1500.
6. The plasma generating device according to any one of claims 1 to 5, characterized in that the plasma generating device further includes a first current limiting resistor (31) connected in series with the internal electrode (11).
7. The plasma generating device according to any one of claims 1 to 5, characterized in that the internal electrode (11) is a silver-plated copper wire.
8. The plasma generating device according to any one of claims 1 to 5, characterized in that the material of the insulating layer (13) is polytetrafluoroethylene.
9. The plasma generating device according to any one of claims 1 to 5, characterized in that the cross section of the DC electrode (2) is wavy.
10. The plasma generating device according to any one of claims 1 to 5, characterized in that the plasma generating device (100) includes a plurality of generating units arranged at intervals, and each of the generating units includes a The direct current electrode (2) and a corresponding spiral electrode group are provided, and each spiral electrode group includes a plurality of the spiral electrodes (1) arranged side by side and spaced apart.
11. The plasma generating device according to claim 10, characterized in that the spiral electrode groups of two adjacent generating units are arranged in a staggered manner.
12. The plasma generating device according to any one of claims 1 to 5, characterized in that the plasma generating device further includes a second current limiting resistor (32) connected in series with the DC electrode (2).
13. The plasma generating device according to any one of claims 1 to 5, characterized in that the plasma generating device further includes a first current limiting resistor (31) connected in series with the internal electrode (11) and A second current limiting resistor (32) connected in series with the DC electrode (2).
14. An air purifier, characterized by comprising the plasma generating device (100) according to any one of claims 1 to 13.

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