Carbon fiber spiral electrode, plasma generating device, and air purifier

Abstract

The present application relates to air purification equipment technical field, disclose a kind of carbon fiber spiral electrode, plasma generating device and air purifier.The carbon fiber spiral electrode includes: spiral electrode, including carbon fiber bundle and the burr suppression structure being wound or wrapped in the outer periphery of carbon fiber bundle, spiral electrode is suitable for grounding;Inner electrode, inner electrode is wrapped with insulating layer, spiral electrode is spirally wound in the outer periphery of insulating layer, inner electrode is suitable for connecting alternating current power supply high voltage end.The carbon fiber spiral electrode of the present application can not only constrain carbon fiber bundle into bundle, effectively reduce the width of carbon fiber bundle, avoid carbon fiber bundle to be laid in insulating layer outside to lead to occupy the discharge area of carbon fiber spiral electrode, can effectively improve discharge effect.At the same time, since the burr suppression structure is wound in the outer periphery of carbon fiber bundle, it also will not pass through the surface of insulating layer to lead to occupy the discharge area of carbon fiber spiral electrode, which further improves the discharge effect of carbon fiber spiral electrode.

Description

Technical Field

[0001] This invention relates to the field of air purification equipment technology, specifically to a carbon fiber spiral electrode, a plasma generator, and an air purifier. Background Technology

[0002] With socio-economic development, residents have increasingly higher requirements for residential interior decoration. The large-scale use of decoration and building materials has led to excessive concentrations of pollutants such as formaldehyde and TVOCs in indoor air, impacting people's health. Currently, methods for purifying indoor air pollution include ventilation, plant purification, microbial methods, physicochemical adsorption, and plasma methods.

[0003] Because low-temperature plasmas contain high-energy electrons, excited-state particles, and active groups, plasma discharge can effectively catalyze the degradation of harmful gases, thus it is increasingly being used in fields such as air purification. Plasma discharge includes corona discharge and glow discharge. Due to its larger discharge area and higher plasma density, glow discharge has excellent application prospects. Under normal circumstances, glow discharge plasma is mostly generated in low-pressure or rare gas environments.

[0004] Existing technologies utilize carbon fiber spiral electrodes formed from carbon fiber materials, with pressing wires wound around the carbon fiber bundle structure to prevent burrs on the carbon fiber surface. This achieves a large-area glow discharge effect under atmospheric pressure and enables continuous and stable atmospheric pressure air glow discharge with good discharge performance. However, the applicant discovered that in such carbon fiber spiral electrodes, the carbon fiber bundle has a large area, occupying the discharge area of ​​the carbon fiber spiral electrode. Simultaneously, the pressing wires also occupy the discharge area of ​​the carbon fiber spiral electrode, which is detrimental to improving the discharge effect. Summary of the Invention

[0005] In view of this, the present invention provides a carbon fiber spiral electrode, a plasma generator, and an air purifier to solve the problem that carbon fiber bundles and pressing wires occupy the discharge area during the use of carbon fiber spiral electrodes in the prior art.

[0006] In a first aspect, the present invention provides a carbon fiber helical electrode, comprising:

[0007] The spiral electrode comprises a carbon fiber bundle and a burr-pressed structure wrapped or wrapped around the outer periphery of the carbon fiber bundle. The spiral electrode is suitable for grounding.

[0008] The inner electrode is wrapped with an insulating layer, and the spiral electrode is spirally wound around the outer periphery of the insulating layer. The inner electrode is suitable for connecting to the high-voltage end of the AC power supply.

[0009] Beneficial effects: The applicant found that when the existing carbon fiber spiral electrode is working, the discharge is formed on the surface of the insulating layer and located between two adjacent carbon fiber bundles. The existing carbon fiber bundles generally include 1,000-10,000 carbon fiber filaments. Therefore, once the carbon fiber bundles are laid flat on the surface of the insulating layer, they will seriously occupy the discharge area of ​​the carbon fiber spiral electrode, resulting in a reduction in the discharge effect of the carbon fiber spiral electrode.

[0010] The carbon fiber spiral electrode of this invention has a burr-pressing structure wrapped or wrapped around the outer periphery of the carbon fiber bundle. This burr-pressing structure effectively suppresses the burrs on the outer surface of the carbon fiber bundle, preventing burr tip discharge breakdown, resulting in more uniform discharge, avoiding abnormal discharge, and extending the lifespan of the carbon fiber spiral electrode. It also avoids excessive wasted work from burr discharge, which affects discharge efficiency, ensuring the carbon fiber spiral electrode maintains good discharge performance. This meets the product's requirement for long-term removal of formaldehyde and other organic substances. Furthermore, it binds the carbon fiber bundle into a bundle, effectively reducing the width of the carbon fiber bundle and preventing it from lying flat outside the insulation layer and occupying the discharge area of ​​the carbon fiber spiral electrode, thus effectively improving the discharge effect.

[0011] Meanwhile, since the burr-pressed structure is wrapped around the carbon fiber bundle, it does not pass through the surface of the insulating layer and thus occupy the discharge area of ​​the carbon fiber spiral electrode, which further improves the discharge effect of the carbon fiber spiral electrode. Therefore, in the use of the carbon fiber spiral electrode of the present invention, the carbon fiber bundle is less prone to burr formation, and the carbon fiber spiral electrode has a large discharge area and good discharge effect.

[0012] The carbon fiber spiral electrode provided in this embodiment significantly reduces the required discharge voltage by using a contact end for glow discharge. Conventional discharge typically requires a discharge voltage of 10,000 volts or higher, while the carbon fiber spiral electrode provided in this embodiment can start discharging from 500 volts. The lower discharge voltage greatly reduces discharge power and improves discharge efficiency. Furthermore, the burr-pressing structure prevents localized discharge breakdown, resulting in more uniform discharge.

[0013] In one alternative embodiment, the width of the spiral electrode is W1, wherein 0.01mm ≤ W1 ≤ 3mm.

[0014] Beneficial effects: It can prevent the carbon fiber bundles from being laid flat outside the insulation layer, thus avoiding occupying the discharge area of ​​the carbon fiber spiral electrode and effectively improving the discharge effect.

[0015] In one alternative embodiment, the burr-pressing structure is a pressing filament wound around a carbon fiber bundle; or,

[0016] The burr pressing structure is a pressing mesh woven from multiple pressing wires.

[0017] Beneficial effects: The pressing mesh can be tightly wrapped around the outer surface of the carbon fiber bundle to suppress the generation of burrs in the carbon fiber bundle.

[0018] In one optional embodiment, the mesh of the pressing mesh is circular, and the diameter of the circular hole is d1, where d1 ≤ 8 mm; or,

[0019] The mesh of the pressed mesh is a polygonal hole, and the diameter of the circumcircle of the polygonal hole is d2, where d2≤8mm.

[0020] In one alternative implementation, 0.01mm≤d1≤3mm or 0.01mm≤d2≤3mm.

[0021] Beneficial effects: The above spacing range is the optimal range obtained through a large number of experiments. When d1 and d2 are within the above range, it can ensure that the burr pressing structure can effectively constrain the width of the carbon fiber bundle and avoid the carbon fiber bundle from generating burrs. At the same time, the burr pressing structure will not occupy too much area, which would affect the discharge of the carbon fiber spiral electrode.

[0022] In one alternative embodiment, the burr pressing structure 102 is a pressing filament wound around the carbon fiber bundle 101, the carbon fiber bundle being spirally wound from one end of the inner electrode to the other end; and / or,

[0023] The pressed filament is wound from one end of the carbon fiber bundle to the other.

[0024] Beneficial effects: With this setup, the pressing wire is less likely to detach from the carbon fiber bundle, making the pressing effect more reliable. It also minimizes the discharge area occupied by the carbon fiber spiral electrode, effectively solving the problem of discharge efficiency decay without affecting the original discharge plasma density and the effect of removing organic matter.

[0025] In one alternative embodiment, the pressed wire is an insulating or semi-insulating material.

[0026] Beneficial effects: When the pressing wire is made of polytetrafluoroethylene (PTFE) fiber, the PTFE fiber material has excellent electron adsorption and release capabilities. In this embodiment, the carbon fiber spiral electrode generates glow discharge through dielectric barrier discharge. The pressing wire, made of insulating PTFE fiber material, plays a significant auxiliary role in the glow discharge due to its excellent electron adsorption and release capabilities. The better the pressing wire's electron adsorption and release capabilities, the better the resulting discharge.

[0027] When the pressing wire is nylon filament, the nylon filament will not affect the discharge of the carbon fiber bundle itself, which can ensure that the discharge parameters are more stable and reliable.

[0028] In one alternative embodiment, the pressed filament is a nylon filament with a diameter of d3, where 0.005mm ≤ d3 ≤ 3mm.

[0029] Beneficial effects: The above range is the optimal range obtained through a large number of experiments. When d3 is within the above range, it can ensure that the nylon filament can reliably constrain the carbon fiber bundle without obscuring the surface of the carbon fiber bundle due to the excessive thickness of the nylon filament.

[0030] In one alternative embodiment, the internal electrode is made of a metallic material; and / or,

[0031] The diameter of the inner electrode is d4, and 0.01mm≤d4≤20mm.

[0032] In one optional embodiment, the carbon fiber spiral electrode includes a spiral electrode with a spiral pitch of W2, where 0.01 mm ≤ W2 ≤ 10 mm; and / or,

[0033] The carbon fiber spiral electrode consists of multiple spiral electrodes, which are evenly and alternately wound on the inner electrode. The distance between two adjacent spiral electrodes is W3, 0.01mm≤W3≤10mm.

[0034] Beneficial effects:

[0035] When the carbon fiber spiral electrode includes two spiral electrodes, with the pitch of the spiral electrodes remaining unchanged, the angle at which a single spiral electrode is wound around the spiral electrode is larger, which further reduces the risk of increased burrs on the carbon fiber bundle caused by the large winding arc of the spiral electrode.

[0036] Secondly, the present invention also provides a plasma generating device, including the carbon fiber spiral electrode of the first aspect of the present invention. Therefore, it possesses the beneficial effects of the carbon fiber spiral electrode of the first aspect of the present invention, namely, it can generate high-density plasma concentration under small volume conditions, greatly reducing the volume of the plasma discharge device. It can be used in any space where plasma generation is required. Furthermore, by setting a burr-pressing structure wrapped or encased on the outer periphery, the burr-pressing structure can effectively suppress the burrs on the outer surface of the carbon fiber bundle, preventing burr tip discharge breakdown, thus making the discharge more uniform, avoiding abnormal discharge, and extending the lifespan of the carbon fiber spiral electrode. It also avoids the problem of excessive wasted work generated by burr discharge, affecting discharge efficiency, ensuring that the carbon fiber spiral electrode always maintains good discharge performance. This meets the product's requirement for long-term removal of formaldehyde and other organic matter. It can also constrain the carbon fiber bundle into a bundle shape, effectively reducing the width of the carbon fiber bundle and preventing the carbon fiber bundle from lying flat outside the insulation layer and occupying the discharge area of ​​the carbon fiber spiral electrode, effectively improving the discharge effect. Simultaneously, since the burr-pressing structure is wrapped around the carbon fiber bundle, it will not pass through the surface of the insulation layer and occupy the discharge area of ​​the carbon fiber spiral electrode, further improving the discharge effect of the air purifier.

[0037] Thirdly, the present invention also provides an air purifier, including the plasma generating device of the second aspect of the present invention. Therefore, it possesses the beneficial effects of the carbon fiber spiral electrode of the second aspect of the present invention, namely, it can generate high-density plasma concentration under small volume conditions, greatly reducing the volume of the plasma discharge device, and can be used in any space where plasma generation is required. Furthermore, by setting a burr-pressing structure wrapped or encased on the outer periphery, the burr-pressing structure can effectively suppress the burrs on the outer surface of the carbon fiber bundle, preventing burr tip discharge breakdown, thus making the discharge more uniform, avoiding abnormal discharge, extending the lifespan of the carbon fiber spiral electrode, and also avoiding the problem of excessive useless work generated by burr discharge affecting discharge efficiency. This ensures that the carbon fiber spiral electrode always maintains good discharge performance, thereby meeting the product's requirement for long-term removal of formaldehyde and other organic matter. It can also constrain the carbon fiber bundle into a bundle shape, effectively reducing the width of the carbon fiber bundle and preventing the carbon fiber bundle from lying flat outside the insulation layer and occupying the discharge area of ​​the carbon fiber spiral electrode, effectively improving the discharge effect. At the same time, since the burr-pressing structure is wrapped around the carbon fiber bundle, it will not pass through the surface of the insulation layer and occupy the discharge area of ​​the carbon fiber spiral electrode, further improving the purification effect of the air purifier. Attached Figure Description

[0038] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0039] Figure 1 This illustrates carbon fiber bundles in the prior art;

[0040] Figure 2 The carbon fiber spiral electrode is an existing technology;

[0041] Figure 3 for Figure 2 Enlarged view of point A in the image;

[0042] Figure 4 This is an enlarged view of the carbon fiber bundle in a carbon fiber spiral electrode in the prior art. The carbon fiber bundle is laid flat on the surface of the insulating layer.

[0043] Figure 5 The carbon fiber bundle and burr pressing structure of the carbon fiber spiral electrode in this embodiment of the invention are shown in the figure. The burr pressing structure in the figure is a pressing mesh.

[0044] Figure 6 for Figure 5 Enlarged view of point B in the middle;

[0045] Figure 7 The carbon fiber spiral electrode is an embodiment of the present invention;

[0046] Figure 8 The carbon fiber bundle and burr pressing structure of the carbon fiber spiral electrode in this embodiment of the invention are shown in the figure. The burr pressing structure in the figure is a pressing wire.

[0047] Figure 9 This is a perspective view of a carbon fiber spiral electrode according to an embodiment of the present invention. The carbon fiber spiral electrode in the figure includes a single spiral electrode.

[0048] Figure 10 This is a perspective view of a carbon fiber spiral electrode according to an embodiment of the present invention. The carbon fiber spiral electrode in the figure includes two spiral electrodes.

[0049] Figure 11 This is a schematic diagram of a plasma generating device according to an embodiment of the present invention.

[0050] Explanation of reference numerals in the attached figures:

[0051] 1000, Plasma generator; 100, Carbon fiber spiral electrode;

[0052] 1. Spiral electrode; 101. Carbon fiber bundle; 102. Burr-pressed structure;

[0053] 2. Internal electrode;

[0054] 3. Insulation layer

[0055] 100', carbon fiber spiral electrode;

[0056] 1', Spiral electrode; 101', Carbon fiber bundle; 103', Burr;

[0057] 2', Internal electrode. Detailed Implementation

[0058] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0059] The following is combined with Figures 1 to 7 and Figures 9 to 10 The following describes embodiments of the present invention.

[0060] The applicant discovered that, Figure 1As shown, the existing carbon fiber spiral electrode includes an inner electrode 2', an insulating layer wrapped around the surface of the inner electrode 2', and a carbon fiber bundle 101' spirally wound around the outer periphery of the insulating layer. During operation, a discharge is formed on the surface of the insulating layer and located between two adjacent turns of the carbon fiber bundle 101'. The existing carbon fiber bundle 101' typically includes 1000-10000 carbon fiber filaments, such as... Figure 2 As shown, the carbon fiber bundle 101' needs to be wound around the inner electrode 2' to form a carbon fiber spiral electrode 100'. Therefore, as Figure 4 As shown, once multiple carbon fiber filaments on the carbon fiber bundle 101' are laid flat on the surface of the insulating layer, they will seriously occupy the discharge area of ​​the carbon fiber spiral electrode 100', resulting in a reduction in the discharge effect of the carbon fiber spiral electrode 100'.

[0061] According to an embodiment of the present invention, in one aspect, a carbon fiber spiral electrode 100 is provided, such as... Figure 6 and Figure 7 As shown, the carbon fiber spiral electrode 100 of this embodiment mainly includes a spiral electrode 1 and an inner electrode 2. The spiral electrode 1 includes a carbon fiber bundle 101 and a burr-pressed structure 102 wrapped or wrapped around the outer periphery of the carbon fiber bundle 101. The spiral electrode 1 is suitable for grounding. The inner electrode 2 is wrapped with an insulating layer 3, and the spiral electrode 1 is spirally wound around the outer periphery of the insulating layer 3. The inner electrode 2 is suitable for connecting to the high-voltage end of an AC power supply.

[0062] In this embodiment of the invention, the carbon fiber spiral electrode 100 has a burr-pressing structure 102 wrapped or encased around the outer periphery of the carbon fiber bundle 101. The burr-pressing structure 102 can effectively suppress the burrs 103' on the outer surface of the carbon fiber bundle 101, preventing discharge breakdown at the burr tips (see...). Figure 2 and Figure 3 This design ensures more uniform discharge, avoids abnormal discharge, and extends the lifespan of the carbon fiber spiral electrode 100. It also prevents excessive wasted work from burrs 103', which could affect discharge efficiency. This allows the carbon fiber spiral electrode 100 to maintain good discharge performance, thus meeting the product's need for long-term removal of formaldehyde and other organic substances. Furthermore, it can bind the carbon fiber bundle 101 into a bundle, effectively reducing the width of the carbon fiber bundle 101 and preventing it from lying flat outside the insulation layer 3, which would occupy the discharge area of ​​the carbon fiber spiral electrode 100 and effectively improve the discharge effect.

[0063] Meanwhile, since the burr pressing structure 102 is wrapped around the carbon fiber bundle 101, it will not pass through the surface of the insulating layer 3 and thus occupy the discharge area of ​​the carbon fiber spiral electrode 100, which further improves the discharge effect of the carbon fiber spiral electrode 100. Therefore, in the use of the carbon fiber spiral electrode 100 of the present invention, the carbon fiber bundle 101 is less likely to generate burrs 103', and the carbon fiber spiral electrode 100 has a large discharge area and a good discharge effect.

[0064] The carbon fiber spiral electrode 100 provided in this embodiment significantly reduces the discharge voltage requirement by using a contact end for glow discharge. Conventional discharge typically requires a discharge voltage of 10,000 volts or higher, while the carbon fiber spiral electrode 100 provided in this embodiment can start discharging from 500 volts. The lower discharge voltage greatly reduces the discharge power and improves discharge efficiency. Furthermore, the burr-pressing structure 102 prevents localized discharge breakdown, resulting in more uniform discharge.

[0065] After the burr-pressing structure 102 is wound around the carbon fiber bundle 101, the width of the carbon fiber bundle 101 is reduced to less than 50% of its original width. When the carbon fiber bundle 101, containing approximately one thousand carbon fibers, is wound around the inner electrode 2, the width of the spiral electrode 1' in the prior art is typically 2 to 3 mm, and some carbon fibers may spread out, resulting in a larger width of the carbon fiber bundle 101. In one embodiment, after being wound or wrapped by the burr-pressing structure 102, the width of the spiral electrode 1 is W1, where 0.01 mm ≤ W1 ≤ 3 mm. In a more preferred embodiment, 0.2 mm ≤ W1 ≤ 1 mm. This avoids the carbon fiber bundle 101 from lying flat outside the insulating layer 3, thus occupying the discharge area of ​​the carbon fiber spiral electrode 100 and effectively improving the discharge effect.

[0066] like Figure 5 and Figure 6 As shown, the burr pressing structure 102 can be selected as a pressing mesh woven from multiple pressing filaments. The pressing mesh is hollow and can be tightly wrapped around the outer surface of the carbon fiber bundle 101 to suppress the generation of burrs 103' on the carbon fiber bundle 101; or the pressing mesh is long and thin with a small width, and the long pressing mesh is spirally wrapped around the outside of the carbon fiber bundle 101 to suppress the generation of burrs on the carbon fiber bundle 101.

[0067] The mesh openings of the pressing mesh are preferably, but not limited to, circular or polygonal. When the mesh openings of the pressing mesh are circular, the diameter of the circular opening is d1, where d1 ≤ 8 mm. In a more preferred embodiment, 0.01 mm ≤ d1 ≤ 3 mm.

[0068] The above spacing range is the optimal range obtained through extensive testing. When d1 is greater than the above range, the mesh of the circular mesh is too sparse, and the carbon fiber bundles 101 in the middle part of the mesh cannot be effectively compressed, which easily produces burrs 103'. When d1 is less than the above range, the area of ​​the circular mesh covering the carbon fiber bundles 101 is too large, which can easily affect the discharge of the carbon fiber spiral electrode 100.

[0069] When the mesh openings of the pressed mesh are polygonal, the diameter of the circumcircle of the polygonal opening is d2, where d2 ≤ 8 mm. In a more preferred embodiment, 0.01 mm ≤ d2 ≤ 3 mm.

[0070] The above spacing range is the optimal range obtained through extensive testing. When d2 is greater than the above range, the carbon fiber bundles 101 in the middle part of the mesh cannot be effectively compressed due to the sparse mesh, which easily leads to burrs 103'. When d2 is less than the above range, the circular mesh covers too large an area of ​​the carbon fiber bundles 101, which can easily affect the discharge of the carbon fiber spiral electrode 100.

[0071] The pressed wire is an insulating material or a board insulating material. In one embodiment, the pressed wire is any one of polytetrafluoroethylene fiber, polyamide fiber, and aramid fiber. Alternatively, the pressed wire is one of fluoropolymer thread, fine nylon thread, and aramid thread. Of course, the pressed wire is not limited to the above materials and can also be other insulating materials.

[0072] In one embodiment, the pressing wire is made of polytetrafluoroethylene (PTFE) fiber, which has excellent electron adsorption and release capabilities. In this embodiment, the carbon fiber spiral electrode 100 generates glow discharge through dielectric barrier discharge. The pressing mesh is made of insulating PTFE fiber material, whose excellent electron adsorption and release capabilities play a significant auxiliary role in the glow discharge. The better the pressing wire's ability to adsorb and release electrons, the better the resulting discharge.

[0073] In one embodiment, the pressing wire is a nylon filament with a diameter of d3, wherein 0.03 mm ≤ d3 ≤ 0.8 mm. When the pressing wire is a nylon filament, the nylon filament will not affect the discharge of the carbon fiber bundle itself, ensuring more stable and reliable discharge parameters.

[0074] The pressing mesh is woven from nylon filaments.

[0075] In one embodiment, the diameter of the inner electrode 2 is d4, where 0.01 mm ≤ d4 ≤ 20 mm. The inner electrode 2 can have various shapes or diameters. A smaller diameter inner electrode 2 results in higher discharge efficiency but more complex manufacturing processes. A larger diameter inner electrode 2 is easier to process and is beneficial for industrial mass production. Preferably, the diameter of the inner electrode 2 is 1.2 mm. The inner electrode 2 can be a solid or hollow metal structure.

[0076] In one embodiment, the inner electrode 2 is made of a metallic material. Optionally, the inner electrode 2 is a metal wire, and the cross-section of the inner electrode 2 is circular, elliptical, rectangular, or other polygonal. Preferably, the cross-section of the inner electrode 2 is circular.

[0077] In one embodiment, the inner electrode 2 is a silver wire. More preferably, the inner electrode 2 is a silver-plated copper wire, as the silver-plated copper wire provides better conductivity.

[0078] In one embodiment, the insulating layer 3 is polytetrafluoroethylene with a thickness of δ, 0.001um≤δ≤2200um. Preferably, the insulating layer 3 has a thickness of 0.2mm. The insulating layer 3 can be formed by uniformly spraying polytetrafluoroethylene onto the outer surface of the inner electrode 2 through a spraying process.

[0079] The carbon fiber spiral electrode 100 may optionally include one or more spiral electrodes 1. In such cases... Figure 10 In the illustrated embodiment, the carbon fiber spiral electrode 100 includes a spiral electrode 1. The spiral electrode 1 is wound with a pitch of W2, where 0.01 mm ≤ W2 ≤ 10 mm. The larger the diameter of the inner electrode 2, the smaller the required pitch. The smaller the diameter of the inner electrode 2, the larger the required pitch. For the same diameter, a larger pitch results in a lower plasma density. In a more preferred embodiment, 2.5 mm ≤ W2 ≤ 3.5 mm. Preferably, the spiral electrode 1 is wound with a pitch of 3 mm. The carbon fiber spiral electrode 100 structure, formed by tightly winding carbon fiber bundles 101, generates a non-uniform electric field covering the entire electrode surface, enabling uniform glow discharge at an AC voltage of 1.8 kV.

[0080] Specifically, the carbon fiber bundle 101 is a 1K carbon fiber bundle with a single filament diameter of 7μm, and the carbon fiber bundle 101 is tightly wound on the surface of the insulation layer 3 with a pitch of 3mm.

[0081] Preferably, the carbon fiber bundle 101 is a carbon fiber nanobundle, and the finer the carbon fiber diameter, the better. The carbon fiber bundle 101 includes n carbon fiber filaments, where 20≤n≤1500.

[0082] Preferably, in this embodiment, the carbon fiber bundle 101 is composed of 50 carbon fiber filaments, and the diameter of a single carbon fiber filament is 0.007 μm.

[0083] It should be noted that, in this embodiment, the carbon fiber bundle 101 is preferably wound around the outside of the insulation layer 3. Of course, special processes such as injection molding and / or stamping and / or spraying can also be used to inject or print the carbon fiber bundle 101 onto the insulation layer 3.

[0084] In such Figure 10In the embodiment shown, the carbon fiber spiral electrode 100 includes a spiral electrode 1, and the spiral electrode 1 is wound with a pitch of W2, where 0.01mm≤W2≤10mm.

[0085] In such Figure 11 In the illustrated embodiment, the carbon fiber spiral electrode 100 includes two spiral electrodes 1, which are uniformly and alternately wound around the inner electrode 2. The spacing between two adjacent spiral electrodes 1 is W3, where 0.01 mm ≤ W3 ≤ 10 mm. In a more preferred embodiment, 2.5 mm ≤ W2 ≤ 3.5 mm. This allows for a larger winding angle of a single spiral electrode 1 while maintaining a constant pitch, further reducing the risk of increased burr 103' on the carbon fiber bundle 101 due to the large winding arc of the spiral electrode 1.

[0086] According to an embodiment of the present invention, another aspect provides a carbon fiber spiral electrode 100, which differs from the aforementioned carbon fiber spiral electrode 100 in that the burr pressing structure 102 is a pressing wire wound around the carbon fiber bundle 101. Compared to using a pressing mesh to press the carbon fiber bundle 101, the carbon fiber spiral electrode 100 of this embodiment uses a pressing wire to press the carbon fiber bundle 101, occupying a smaller area. This is more conducive to binding the carbon fiber bundle 101 and does not affect the discharge of the carbon fiber spiral electrode 100.

[0087] In one embodiment, the burr pressing structure 102 is a nanoscale pressing wire made of insulating material. The pressing wire is a small-diameter insulating wire bundle tightly wound around the outer surface of the carbon fiber bundle 101 to press the burrs 103' on the surface of the carbon fiber bundle 101, preventing excessive partial discharge and breakdown. Of course, there can also be two or more pressing wires to improve the pressing effect.

[0088] The following is combined with Figure 8 The following describes embodiments of the present invention.

[0089] In one embodiment, the carbon fiber bundle 101 is spirally wound from one end of the inner electrode 2 to the other. This configuration allows for discharge across the entire surface of the insulating layer 3, without wasting the discharge area of ​​the carbon fiber spiral electrode 100. Preferably, in this embodiment, the pressing wire is wound from one end of the carbon fiber bundle 101 to the other. This configuration prevents the pressing wire from easily detaching from the carbon fiber bundle 101, resulting in a more reliable pressing effect. It also minimizes the discharge area occupied by the carbon fiber spiral electrode 100, effectively solving the problem of discharge efficiency decay without affecting the original plasma density and the removal of organic matter.

[0090] In one embodiment, the two ends of the pressing wire are respectively bonded and fixed to the surface of the insulating layer 3 of the inner electrode 2 or the end of the carbon fiber bundle 101. Specifically, the pressing wire is tightly pressed against the outside of the carbon fiber bundle 101, with at least one extra turn at each end. The extra turn is directly wrapped and fixed to the outside of the carbon fiber bundle 101, and is bonded and fixed to the surface of the carbon fiber bundle 101 by adhesive, glue, or adhesive tape, so as to ensure that the pressing wire can be stably fixed on the electrode and will not fall off, thereby reliably pressing it against the outside of the carbon fiber bundle 101.

[0091] The burr pressing structure 102 is preferably made of insulating material. Compared with the use of conductive material, the insulating burr pressing structure 102 makes it easier to control the discharge intensity of the entire electrode. Moreover, the burr pressing structure 102 does not participate in the discharge, which can greatly reduce the influence and interference of the burr pressing structure 102 on the discharge of the carbon fiber spiral electrode 100.

[0092] In one embodiment, the pressing wire is any one of polytetrafluoroethylene fiber, polyamide fiber, and aramid fiber. Alternatively, the pressing wire is one of fluoropolymer thread, fine nylon thread, and aramid thread. Of course, the pressing wire is not limited to the above materials and can also be other insulating materials.

[0093] In one embodiment, the pressing wire is made of polytetrafluoroethylene (PTFE) fiber, as PTFE fiber has excellent electron adsorption and release capabilities. In this embodiment, the carbon fiber spiral electrode 100 generates glow discharge through dielectric barrier discharge. The pressing wire, made of insulating PTFE fiber, plays a significant auxiliary role in the glow discharge due to its excellent electron adsorption and release capabilities. The better the pressing wire's electron adsorption and release capabilities, the better the resulting discharge.

[0094] In one embodiment, the pressing wire is polytetrafluoroethylene fiber, which can effectively suppress the generation of carbon fiber burrs 103'. On the other hand, polytetrafluoroethylene fiber does not affect the discharge. Polytetrafluoroethylene can adsorb electrons during the positive half-cycle discharge of AC, providing electrons for the negative half-cycle discharge, which is conducive to the occurrence of discharge and avoids the carbon fiber bundle 101 being pressed and affecting the uniformity of electrode discharge.

[0095] In one embodiment, the pressing wire is polytetrafluoroethylene fiber with a diameter d5 of 0.005 mm ≤ d5 ≤ 3 mm. Preferably, in this embodiment, the pressing wire is polytetrafluoroethylene fiber with a diameter of 0.1 mm ≤ d5 ≤ 0.15 mm.

[0096] It should be noted that in this embodiment, the pressing wire is not limited to being wound and pressed around the carbon fiber bundle 101; it can also be pressed by spraying.

[0097] In an optimal embodiment, the pressing filament is nylon filament. By comparison, nylon filament does not affect the discharge of the carbon fiber bundle 101 itself, thus ensuring more stable and reliable discharge parameters.

[0098] In one embodiment, the pressed wire is a nylon wire with a diameter of d3, where 0.005mm ≤ d3 ≤ 3mm.

[0099] The above range is the optimal range obtained through a large number of experiments. When d3 is within the above range, it can ensure that the nylon filament can reliably constrain the carbon fiber bundle 101, and will not obscure the surface of the carbon fiber bundle 101 too much due to the excessive thickness of the nylon filament.

[0100] According to an embodiment of the present invention, another aspect provides a plasma generating device 1000, including the carbon fiber spiral electrode 100 in the above embodiment.

[0101] The following is combined with Figure 11 The following describes embodiments of the present invention.

[0102] The plasma generator 1000 of this embodiment, by employing a carbon fiber spiral electrode 100, can achieve high-density plasma concentration under small volume conditions, greatly reducing the size of the plasma discharge equipment. It can be used in any space where plasma generation is required. Furthermore, by setting a burr-pressing structure 102 wrapped or wrapped around the outer periphery, the burr-pressing structure 102 can effectively suppress the burrs on the outer surface of the carbon fiber bundle 101, avoiding the discharge breakdown phenomenon at the burr tip, thereby making the discharge more uniform, avoiding abnormal discharge, extending the life of the carbon fiber spiral electrode 100, and also avoiding the problem of excessive useless work generated by burr discharge, which affects the discharge efficiency. This ensures that the carbon fiber spiral electrode 100 always maintains good discharge performance, thereby meeting the product's requirement for long-term removal of formaldehyde and other organic substances. It can also constrain the carbon fiber bundle 101 into a bundle shape, effectively reducing the width of the carbon fiber bundle 101, preventing the carbon fiber bundle 101 from being laid flat outside the insulation layer 3 and occupying the discharge area of ​​the carbon fiber spiral electrode 100, thus effectively improving the discharge effect. Meanwhile, since the burr pressing structure 102 is wrapped around the carbon fiber bundle 101, it will not pass through the surface of the insulating layer 3 and thus occupy the discharge area of ​​the carbon fiber spiral electrode 100, which further improves the discharge effect of the plasma generator 1000.

[0103] According to an embodiment of the present invention, another aspect provides an air purifier, including the plasma generating device 1000 of the above embodiment. By employing a carbon fiber spiral electrode 100, a high-density plasma concentration can be generated under small volume conditions, greatly reducing the volume of the plasma discharge device. It can be used in any space where plasma generation is required. Furthermore, by setting a burr-pressing structure 102 wrapped or wrapped around the outer periphery, the burr-pressing structure 102 can effectively suppress the burrs on the outer surface of the carbon fiber bundle 101, avoiding the phenomenon of discharge breakdown at the burr tip, thereby making the discharge more uniform, avoiding abnormal discharge, and extending the life of the carbon fiber spiral electrode 100. At the same time, it also avoids the problem of excessive useless work generated by burr discharge, which affects the discharge efficiency. This ensures that the carbon fiber spiral electrode 100 always maintains good discharge performance, thereby meeting the product's requirement for long-term removal of organic matter such as formaldehyde. It can also constrain the carbon fiber bundle 101 into a bundle shape, effectively reducing the width of the carbon fiber bundle 101, and preventing the carbon fiber bundle 101 from being laid flat outside the insulation layer 3, thus occupying the discharge area of ​​the carbon fiber spiral electrode 100 and effectively improving the discharge effect. Meanwhile, since the burr pressing structure 102 is wrapped around the carbon fiber bundle 101, it will not pass through the surface of the insulating layer 3 and thus occupy the discharge area of ​​the carbon fiber spiral electrode 100, which further improves the discharge effect of the air purifier.

[0104] In summary, the carbon fiber spiral electrode 100, plasma generator 1000, and air purifier of this invention can generate high-density plasma concentration under small volume conditions, greatly reducing the volume of plasma discharge equipment. They can be used in any space where plasma generation is required. Furthermore, by setting a burr-pressing structure 102 wrapped or wrapped around the outer periphery, the burr-pressing structure 102 can effectively suppress the burrs on the outer surface of the carbon fiber bundle 101, avoiding the discharge breakdown phenomenon at the burr tip, thereby making the discharge more uniform, avoiding abnormal discharge, and extending the life of the carbon fiber spiral electrode 100. At the same time, it also avoids the problem of excessive useless work generated by burr discharge, which affects the discharge efficiency. This ensures that the carbon fiber spiral electrode 100 always maintains good discharge performance, thereby meeting the product's requirement for long-term removal of formaldehyde and other organic substances. It can also constrain the carbon fiber bundle 101 into a bundle shape, effectively reducing the width of the carbon fiber bundle 101 and preventing the carbon fiber bundle 101 from being laid flat outside the insulation layer 3, thus occupying the discharge area of ​​the carbon fiber spiral electrode 100 and effectively improving the discharge effect. Meanwhile, since the burr pressing structure 102 is wrapped around the carbon fiber bundle 101, it will not pass through the surface of the insulating layer 3 and thus occupy the discharge area of ​​the carbon fiber spiral electrode 100, further improving the discharge effect of the air purifier.

[0105] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A carbon fiber spiral electrode, characterized in that, include: The spiral electrode (1) includes a carbon fiber bundle (101) and a burr pressing structure (102) wrapped or wrapped around the outer periphery of the carbon fiber bundle (101), wherein the burr pressing structure (102) constrains the carbon fiber bundle (101) into a bundle shape, and the spiral electrode (1) is adapted to be grounded. The inner electrode (2) is wrapped with an insulating layer (3), and the spiral electrode (1) is spirally wound around the outer periphery of the insulating layer (3). The inner electrode (2) is suitable for connecting to the high voltage end of the AC power supply. The width of the spiral electrode (1) is W1, wherein 0.01mm≤W1≤3mm.

2. The carbon fiber spiral electrode according to claim 1, characterized in that, The burr pressing structure (102) is a pressing filament wrapped around the carbon fiber bundle (101); or, The burr pressing structure (102) is a pressing mesh woven from multiple pressing wires.

3. The carbon fiber spiral electrode according to claim 2, characterized in that, The mesh of the pressing mesh is circular, and the diameter of the circular hole is d1, where d1 ≤ 8 mm; or, The mesh of the pressing mesh is a polygonal hole, and the diameter of the circumcircle of the polygonal hole is d2, where d2≤8mm.

4. The carbon fiber spiral electrode according to claim 3, characterized in that, 0.01mm≤d1≤3mm or 0.01mm≤d2≤3mm.

5. The carbon fiber spiral electrode according to any one of claims 2 to 4, characterized in that, The pressing wire is an insulating or semi-insulating material.

6. The carbon fiber spiral electrode according to claim 5, characterized in that, The pressed filament is a nylon filament with a diameter of d3, where 0.005mm ≤ d3 ≤ 3mm.

7. The carbon fiber spiral electrode according to any one of claims 1 to 4, characterized in that, The internal electrode (2) is made of a metallic material; and / or, The diameter of the inner electrode (2) is d4, 0.01 mm ≤ d4 ≤ 20 mm.

8. The carbon fiber spiral electrode according to any one of claims 1 to 4, characterized in that, The carbon fiber spiral electrode includes a single spiral electrode (1), wherein the spiral electrode (1) is wound with a pitch of W2, 0.01 mm ≤ W2 ≤ 10 mm; and / or, The carbon fiber spiral electrode includes multiple spiral electrodes (1), which are evenly and alternately wound on the inner electrode (2). The distance between two adjacent spiral electrodes (1) is W3, 0.01 mm ≤ W3 ≤ 10 mm.

9. A plasma generating device, characterized in that, Includes the carbon fiber spiral electrode according to any one of claims 1 to 8.

10. An air purifier, characterized in that, Includes the plasma generating apparatus as described in claim 9.

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