A fiber discharge electrode and a method for preparing the same

Abstract

The present invention discloses a fiber discharge electrode and a preparation method thereof, wherein a fiber discharge electrode comprises: a conductive column; a fixed metal wire, which is wound on the conductive column and forms a plurality of coils along the radial direction of the conductive column; a conductive fiber bundle, which comprises a fixed section and an extension section, wherein the fixed section is fastened between the conductive column and the fixed metal wire by the winding force of the fixed metal wire on the conductive column, and the extension section extends the fixed metal wire through the gap between adjacent coils. Through the arrangement of the structure of the present invention, more discharge points can be provided, and thus higher discharge efficiency can be achieved. When only a plasma with a fixed concentration requirement needs to be provided, the discharge voltage can be reduced to achieve low-concentration ozone discharge; at the same time, the breakage of high-hardness and brittle fibers during the preparation process can be avoided, thereby effectively ensuring the quality stability of the electrode product.

Description

Technical Field

[0001] The invention relates to the field of discharge technology, and in particular to a fiber discharge electrode and a preparation method thereof. Background Art

[0002] For air purifier electrodes, needle-shaped or wire-shaped electrodes are generally used. Since the electrode material is easily oxidized due to high-voltage discharge during operation, corrosion-resistant metal materials such as tungsten or special alloys are often used. Due to processing accuracy, oxidation, strength and other reasons, the tip of the needle-shaped electrode and the wire diameter of the wire-shaped electrode cannot be infinitely reduced. It is generally believed that the radius of the needle tip of the needle-shaped electrode is between 0.5-200μm. In the general field of air purifiers, the radius is mostly around 10-100μm. If it is lower, it is difficult to ensure that the strength and oxidation resistance of the material can meet the requirements of product design.

[0003] In order to achieve a smaller radius at the tip of the needle, and theoretically achieve the purpose of higher plasma efficiency at the same voltage and lower voltage at the same efficiency, Chinese patent application CN205724387U discloses a carbon fiber discharge device, which uses a socket to be set at the tip of the discharge needle, the bottom end of the conductive fiber bundle is inserted into the socket, and then the bottom end of the conductive fiber bundle is fixed to the tip of the discharge needle by welding, and the conductive fiber bundle is used instead of the needle tip for discharge. This method requires inserting carbon fiber at the tip of an extremely fine discharge needle, which is very difficult to operate and it is difficult to ensure the quality stability of the product; and the welding method is difficult to ensure that the joint surface between the carbon fiber and the metal is in close contact, and generally a large interface resistance will be generated. Under high-voltage discharge conditions, the interface between the carbon fiber and the metal is very easy to oxidize, affecting the stability of the electrode.

[0004] Chinese patent application CN109962209A discloses a method for preparing a carbon fiber electrode, which specifically uses fiber bundles and metal wires to form electrodes by twisting and bundling. Although the twisting and bundling method is simpler to prepare than the above-mentioned Chinese patent application CN205724387U, since carbon fiber is a hard, thin-wire material, it is brittle and easy to break. For high-hardness and brittle fibers such as carbon fiber, it is difficult to effectively fix them when the twisting brush force is small, and it is easy to cause fiber breakage when the twisting brush force is too large. Therefore, the structure and preparation method publicly recorded in this public document also have the problem of difficulty in ensuring the stable quality of electrode products for electrodes prepared from such high-hardness and brittle fibers. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that it is difficult to ensure the quality stability of the electrode products for electrodes prepared from fibers with high hardness and brittleness such as carbon fibers, thereby providing a fiber discharge electrode and a preparation method thereof to solve the above problem.

[0006] A fiber discharge electrode, comprising:

[0007] Conductive column;

[0008] A fixed metal wire is wound around the conductive column to form a plurality of windings along the radial direction of the conductive column;

[0009] The conductive fiber bundle comprises a fixed section and an extended section. The fixed section is fastened between the conductive column and the fixed metal wire through the winding force of the fixed metal wire on the conductive column, and the extended section extends out of the fixed metal wire through the gap between adjacent windings.

[0010] The fixed section of the conductive fiber bundle is wound on the conductive column;

[0011] The conductive fiber bundles at the fixed metal wire positions are connected with each other through conductive glue.

[0012] The invention also comprises an insulating sleeve with openings at both ends, and the insulating sleeve is sleeved on the extended section of the conductive fiber bundle.

[0013] The height of the insulating sleeve is the same as the length of the extending section.

[0014] The conductive fiber bundle is a carbon fiber bundle, which includes at least 2000 carbon fiber filaments, and the wire diameter of a single carbon fiber filament is 5-7 μm.

[0015] The number of carbon fiber filaments in the carbon fiber bundle is 2000-10000.

[0016] The conductive fiber bundle is a polyacrylonitrile carbon fiber bundle, the insulating sleeve is a PTFE sleeve or a ceramic sleeve, and the conductive column and the fixed metal wire are made of copper.

[0017] The present invention also comprises a sealing layer, which is used to wrap the conductive column, the fixed metal wire and the fixed section of the conductive fiber bundle, and is fixedly connected to the bottom end of the insulating sleeve.

[0018] The sealing layer is made of epoxy resin or silicone resin.

[0019] A method for preparing a fiber discharge electrode, comprising:

[0020] Obtaining conductive posts, fixed metal wires and conductive fiber bundles;

[0021] Preliminarily fixing the fixed section of the conductive fiber bundle on the conductive column;

[0022] A fixed metal wire is spirally wound around the circumference of the conductive column to form a plurality of coils, so that the fixed section of the conductive fiber bundle is tightly fixed between the conductive column and the fixed metal wire. During the spiral winding of the fixed metal wire, a gap is reserved between two adjacent coils at the extended position of the conductive fiber bundle so that the extended section of the conductive fiber bundle extends out through the gap.

[0023] The fixed section of the conductive fiber bundle is initially fixed on the conductive column by winding.

[0024] After the conductive fiber bundle is fixed on the conductive column by using a fixing metal wire, an insulating sleeve is sleeved on the extended section of the conductive fiber bundle;

[0025] The extension section of the conductive fiber bundle is annular; the length of the annular extension section is greater than the height of the insulating sleeve. After the insulating sleeve is sleeved, the conductive fiber bundle extending out of the top of the insulating sleeve is cut off to make the length of the extension section the same as the height of the insulating sleeve.

[0026] After the insulating sleeve is sleeved, a sealing layer is coated on the outer layer of the fixed metal wire to wrap the conductive column, the fixed metal wire and the fixed section of the conductive fiber bundle. The sealing layer is fixed to the lower end of the insulating sleeve as an integrated structure.

[0027] The sealing layer is potted and molded by epoxy resin or silicone resin under vacuum conditions.

[0028] The conductive fiber bundle is also subjected to any of the following pretreatment steps before use;

[0029] Pretreatment 1: Place the conductive fiber bundle in ethanol for ultrasonic cleaning and drying;

[0030] Pretreatment 2: calcining the conductive fiber bundle at 800°C for 0.5-1h;

[0031] Pretreatment 3: Under nitrogen protection, the conductive fiber bundle is electrified to make the carbon fiber red. After keeping it red for 10 minutes, it is cooled under nitrogen protection.

[0032] The technical solution of the present invention has the following advantages:

[0033] 1. A fiber discharge electrode provided by the present invention uses a fiber bundle to replace a needle-shaped electrode, so it has more discharge points and thus has a higher discharge efficiency. When only a plasma with a fixed concentration requirement needs to be provided, the discharge voltage can be reduced, thereby realizing low-concentration ozone discharge. In addition, the present invention tightly fixes the conductive fiber bundle between the conductive column and the fixed metal wire by the winding force of the fixed metal wire on the conductive column, and realizes the structural design of the extension of the conductive fiber bundle extension section through the gap between adjacent windings. The close contact between the conductive fiber bundle and the conductive column can be achieved only by the pressure between the fixed metal wire and the conductive column, thereby reducing the contact resistance and improving the stability of the power-on voltage. At the same time, the force required to achieve close contact between the conductive fiber bundle and the conductive metal is the pressure between the fixed metal wire and the conductive column, rather than the larger torque force used in the prior art. When using pressure, it is only necessary to reserve a certain gap between the two adjacent windings at the position where the conductive fiber bundle extends out, so as to ensure that the conductive fiber bundle can extend out of the fixed metal wire, thereby forming a number of discharge points. This method will not cause the high-hardness and brittle fibers to break during the preparation process, thereby effectively ensuring the quality stability of the electrode product.

[0034] 2. The present invention further optimizes the structure of the fiber discharge electrode. Specifically, the fixed section of the conductive fiber bundle in the structure is wound around the conductive column. Through the optimization of the structure, the positioning of the conductive fiber bundle can be better achieved, especially the positioning of the extended section in the conductive fiber bundle, which is more convenient for the manufacture of the electrode.

[0035] 3. The bottom of the extended section of the conductive fiber bundle provided by the present invention is provided with conductive glue, and the provision of the conductive glue can better achieve electrical connection between the fibers in the conductive fiber bundle and better ensure the conductivity of each fiber.

[0036] 4. The conductive fiber bundle in the present invention is a brittle material. In particular, once energized, due to the repulsion effect of the same charges, each fiber in the extended section of the conductive fiber bundle will be directly dispersed. Although the loose discharge head will increase the contact surface with the air, making the generated plasma more concentrated, it will cause large electric field fluctuations and more prone to spark breakdown. In the present invention, an insulating sleeve is further added at the extended section of the conductive fiber bundle. Through the setting of the insulating sleeve, not only can each fiber be bound within a certain range, but also the fiber can be prevented from automatically dispersing and breaking, spark discharge, etc. when energized; at the same time, due to the binding of the insulating sleeve, the direction of discharge can be limited, so that the consistency of the discharge direction is better, and the discharge influence in other directions is reduced, so that the generated ion wind has directionality, and then the dust in the air is less likely to be enriched and accumulated on the conductive fiber bundle, effectively eliminating the cleaning problem of the carbon fiber discharge electrode, and improving the service life to a certain extent.

[0037] 5. In a fiber discharge electrode provided by the present invention, a sealing layer is additionally provided. Through the provision of the sealing layer, only the extended section of the conductive fiber bundle is reserved. The provision of the sealing layer can effectively reduce the discharge at the carbon fiber winding point, and also reduce oxidation and increase the service life.

[0038] 6. The conductive fiber bundle in the present invention is a carbon fiber bundle, preferably a polyacrylonitrile carbon fiber bundle, which has the effects of high conductivity, small fluctuation of conductivity with temperature, and a certain field emission effect, and is more stable than metal wire discharge.

[0039] 7. In a method for preparing a fiber discharge electrode provided by the present invention, in a scheme with an insulating sleeve, the extension section of the conductive fiber bundle is adopted to be a ring-shaped structure. After the insulating sleeve is connected, the conductive fiber bundle extending out of the insulating sleeve is cut off flushly to form a number of discharge points that are highly consistent with the insulating sleeve. Compared with the method of directly using an extension section with a number of discharge points for insulating sleeve connection, this method is less likely to cause the breakage of a single fiber. If a fiber breaks and is connected to the high voltage and the grounding electrode, it will cause the high voltage to directly form a path. In a milder case, a single fiber will directly discharge and vaporize, forming a pulse current for a short time. In a severe case, it will directly cause the device to burn out. Therefore, the formation of discharge points that are highly consistent with the insulating sleeve in the present invention can avoid the breakage of the fiber caused by excessive length margin at the top of the insulating sleeve, and can better ensure the quality stability of the electrode product.

[0040] 8. The carbon fiber in the present invention can be used normally without surface treatment, but as the use time increases, impurities on the surface will cause the discharge stability of the carbon fiber to deteriorate and reduce its service life. Therefore, in a method for preparing a fiber discharge electrode provided by the present invention, the carbon fiber is also subjected to an initial surface pretreatment. The present invention can further extend its service life through pretreatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1 It is a schematic structural diagram of the fiber discharge electrode of the present invention;

[0043] Figure 2 It is a schematic diagram of the structure in which the conductive fiber bundle and the fixed metal wire are wound around the conductive column in the present invention.

[0044] Figure 3 It is a schematic diagram of the structure of the extended section before being cut off when it is ring-shaped in the preparation method of the present invention.

[0045] Description of reference numerals:

[0046] 1-conductive column, 2-fixing metal wire, 3-conductive fiber bundle, 4-insulating sleeve, 5-sealing layer, 6-conductive glue. DETAILED DESCRIPTION

[0047] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0049] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0051] Example 1

[0052] A fiber discharge electrode, such as Figure 1 As shown, it includes: a conductive column 1, a fixed metal wire 2, and a conductive fiber bundle 3; wherein the fixed metal wire 2 is wound on the conductive column 1 to form a plurality of coils along the radial direction of the conductive column 1; the conductive fiber bundle 3 includes a fixed section and an extended section, the fixed section is fastened between the conductive column 1 and the fixed metal wire 2 by the winding force of the fixed metal wire 2 on the conductive column 1, and the extended section extends out of the fixed metal wire 2 through the gap between adjacent coils.

[0053] The above-mentioned fiber discharge electrode provided by the present invention adopts a fiber bundle to replace the needle-shaped electrode, which can have more discharge points and thus has a higher discharge efficiency. When only a plasma with a fixed concentration requirement needs to be provided, the discharge voltage can be reduced, thereby realizing low-concentration ozone discharge. In addition, the present invention tightly fixes the conductive fiber bundle between the conductive column and the fixed metal wire by the winding force of the fixed metal wire on the conductive column, and realizes the structural design of the extension of the conductive fiber bundle extension section through the gap between adjacent windings. The close contact between the conductive fiber bundle and the conductive column can be achieved only by the pressure between the fixed metal wire and the conductive column, thereby reducing the contact resistance and improving the stability of the power-on voltage; at the same time, the force required to achieve close contact between the conductive fiber bundle and the conductive metal is the pressure between the fixed metal wire and the conductive column, rather than the larger torque force used in the prior art. When using pressure, it is only necessary to reserve a certain gap between the two adjacent windings at the position where the conductive fiber bundle extends out, so as to ensure that the conductive fiber bundle can extend out of the fixed metal wire, thereby forming a number of discharge points; this method will not cause the high-hardness and brittle fibers to break during the preparation process, thereby effectively ensuring the quality stability of the electrode product.

[0054] The conductive fiber bundle 3 in the present invention is a carbon fiber bundle, preferably a polyacrylonitrile carbon fiber bundle with higher surface finish and more stable discharge. To ensure that the quality of the carbon fiber can meet the requirements of the electrode, the carbon content in the carbon fiber is required to reach more than 95%, and the diameter of the single fiber is 5-7μm. Unless there are special requirements, it is best to choose a 5μm product. The low wire diameter is easier to discharge. In a single bundle of conductive fiber bundles, according to the electrode size designed as needed, it can be about 2000-10000 carbon fibers, preferably at least 2000 carbon fiber filaments, and more preferably 2000-10000. Therefore, under the same voltage, the carbon fiber bundle has more discharge points and therefore has a higher discharge efficiency.

[0055] The conductive column 1 in the present invention is made of conductive metal, and copper is used in this embodiment. The fixing metal wire 2 can be any metal wire that can be fixed by carbon fiber wrapping, such as conductive copper wire or conductive aluminum wire. In this embodiment, the fixing metal wire 2 is conductive copper wire.

[0056] The conductive fiber bundle 3 in the present invention may be wound around the conductive column 1 or not. However, in order to better realize the positioning of the extended section in the conductive fiber bundle 3, the conductive fiber bundle 3 in this embodiment adopts a setting mode in which the fixed section is wound around the conductive column 1, such as Figure 2 shown.

[0057] In order to achieve better positioning, a conductive glue 6 can be provided at the bottom end of the extended section of the conductive fiber bundle 3 while the fixed section is wound around the conductive column 1. Figure 1The present invention can realize the electrical connection between the fibers in the conductive fiber bundle 3 through the conductive adhesive 6, and can also effectively realize the preliminary fixation of the conductive fiber bundle 3 on the conductive column 1, so as to better facilitate the positioning of the conductive fiber bundle 3.

[0058] Furthermore, the present invention also includes an insulating sleeve 4 with two ends open, and the insulating sleeve 4 is sleeved on the extended section of the conductive fiber bundle 3. The extended length of the extended section can be less than the height of the insulating sleeve 4, or can be equal to the height of the insulating sleeve 4, or can be slightly higher than the height of the insulating sleeve 4, as long as the length of the extended section of the conductive fiber bundle 3 higher than the insulating sleeve 4 is ensured not to be broken due to the mutual repulsion of the tip charges when the power is on. Preferably, the extended length of the extended section is substantially the same as the height of the insulating sleeve 4, such as Figure 1 As shown. The present invention can not only constrain each fiber within a certain range by setting the insulating sleeve, but also prevent the fibers from automatically spreading and breaking, sparking and discharging when electrified; at the same time, due to the binding of the insulating sleeve, the discharge direction can be limited, so that the consistency of the discharge direction is better, and the discharge influence in other directions is reduced, so that the generated ion wind has directionality, and then the dust in the air is less likely to accumulate on the conductive fiber bundle, effectively eliminating the problem of cleaning the carbon fiber discharge electrode, and improving the service life to a certain extent.

[0059] The insulating sleeve 4 is a PTFE sleeve or a ceramic sleeve. For small discharge modules, when the life requirement is not strict, a PTFE sleeve can be used; if the life requirement is more than 5 years, a ceramic sleeve is recommended. The height of the insulating sleeve 4 is the same as the length of the extension section. Figure 1 shown.

[0060] Furthermore, the present invention also includes a sealing layer 5, which is used to wrap the conductive column 1, the fixed metal wire 2, and the fixed section of the conductive fiber bundle 3, and is fixedly connected to the bottom end of the insulating sleeve 4. The material of the sealing layer 5 is epoxy resin or silicone resin. Under normal circumstances, epoxy resin can be used to form the sealing layer 5, and silicone resin can be used to form the sealing layer 5 under high voltage conditions. In the present invention, the sealing layer 5 is set in a manner of encapsulating with epoxy resin or silicone resin under vacuum conditions to reduce bubbles in the sealing layer 5 and improve the sealing performance.

[0061] Specifically, the conductive glue 6 is filled at the bottom end of the insulating sleeve 4 to achieve the sealing and electrical connection of the bottom end of the extended section of the conductive fiber bundle 3 in the insulating sleeve 4, and then the sealing layer 5 is used to achieve the sealing of all components outside the insulating sleeve 4 except the insulating sleeve 4. The sealed components include the conductive column 1, the fixed metal wire 2 and the fixed section of the conductive fiber bundle 3, and the bottom end position of the insulating sleeve 4 forms an integrated structure with the sealing layer 5, such as Figure 1 shown.

[0062] Example 2

[0063] A method for preparing a fiber discharge electrode, specifically comprising:

[0064] Obtain a copper conductive column 1, a copper fixing metal wire 2, a conductive fiber bundle 3 composed of polyacrylonitrile carbon fiber, an insulating sleeve 4, a conductive adhesive 6, and a sealing resin;

[0065] One end of the conductive fiber bundle 3 is spirally wound on the conductive column 1, and at the same time, a fixed metal wire 2 is synchronously used to spirally wind the conductive column 1 with the conductive fiber bundle 3 wound thereon at the same end, so that the conductive fiber bundle 3 is tightly fixed on the conductive column 1; when the conductive fiber bundle 3 moves to the position where it needs to be extended during the winding process, the free end of the conductive fiber bundle 3 is extended out of the fixed metal wire 2, and then the fixed metal wire 2 is continued to be spirally wound around the extended conductive fiber bundle 3. After at least one circle, the conductive fiber bundle 3 is returned to the position of the conductive column 1 after reserving a certain length outside the fixed metal wire 2, and the fixed metal wire 2 is continued to be tightly fixed on the conductive column 1; continue to complete the spiral winding of all the conductive fiber bundles 3 and the fixed metal wire 2 on the conductive column 1. The reserved length of the fiber bundle is the extended section of the conductive fiber bundle 3, and the extended section is annular. After the extended section is straightened along the direction of the central axis after the insulating sleeve 4 is installed, the length between the top and the bottom should be greater than the height of the insulating sleeve 4, such as Figure 3 In order to avoid the breakage of the fiber filaments in the conductive fiber bundle 3 during the winding process, the number of spiral winding turns per unit length is set to be smaller while achieving the purpose of facilitating positioning, such as Figure 2 shown.

[0066] Then, a conductive glue 6 is arranged at the bottom of the extended end of the conductive fiber bundle 3 to realize electrical connection between the fibers in the conductive fiber bundle 3. While the conductive glue 6 is arranged, the insulating sleeve 4 is sleeved on the extended section of the conductive fiber bundle 3. Figure 3 After the insulating sleeve 4 is installed, the conductive fiber bundle 3 extending from the top of the insulating sleeve 4 is trimmed with scissors to be flush with the top of the insulating sleeve 4, as shown in FIG. Figure 1 shown.

[0067] The sealing resin is used to wrap the conductive column 1, the fixed metal wire 2, and the fixed section of the conductive fiber bundle 3 outside the insulating sleeve 4, thereby forming a sealing layer 5, which is fixed to the bottom end of the insulating sleeve 4 as an integral structure. Figure 1 shown.

[0068] Example 3

[0069] This embodiment further provides an optimized solution for the preparation method of the fiber discharge electrode, that is, before the conductive fiber bundle 3 is wound around the conductive column 1, the conductive fiber bundle 3 is pretreated as follows:

[0070] 1) Ethanol + ultrasonic cleaning, drying, suitable for laboratory level applications;

[0071] 2) Calcinate in a muffle furnace at 800°C for 0.5-1h and remove by high-temperature carbonization, which is suitable for small-batch trial production;

[0072] 3) Under nitrogen protection, a large current is applied, and the current is controlled to a level where the carbon fiber turns red (about 800-1000°C) visible to the naked eye. After 10 minutes, cool under nitrogen protection, which is suitable for large-scale continuous production.

[0073] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A fiber discharge electrode, characterized in that: include: Conductive column (1); A fixed metal wire (2) is wound around the conductive column (1) to form a plurality of windings along the radial direction of the conductive column (1); The conductive fiber bundle (3) comprises a fixed section and an extended section, wherein the fixed section is fastened between the conductive column (1) and the fixed metal wire (2) by the winding force of the fixed metal wire (2) on the conductive column (1), and the extended section extends out of the fixed metal wire (2) through the gap between adjacent windings; An insulating sleeve (4) with openings at both ends, the insulating sleeve (4) being sleeved on an extended section of the conductive fiber bundle (3); The fixed section of the conductive fiber bundle (3) is wound on the conductive column (1); The conductive fiber bundle (3) at the position of the fixed metal wire (2) is connected to each other through the conductive glue (6).

2. A fiber discharge electrode according to claim 1, characterized in that: The height of the insulating sleeve (4) is the same as the length of the extended section.

3. A fiber discharge electrode according to claim 1, characterized in that: The conductive fiber bundle (3) is a carbon fiber bundle, which includes at least 2000 carbon fiber filaments, and the wire diameter of a single carbon fiber filament is 5-7 μm.

4. A fiber discharge electrode according to claim 3, characterized in that: The number of carbon fiber filaments in the carbon fiber bundle is 2000-10000.

5. A fiber discharge electrode according to claim 1, characterized in that: The conductive fiber bundle (3) is a polyacrylonitrile carbon fiber bundle, the insulating sleeve (4) is a PTFE sleeve or a ceramic sleeve, and the conductive column (1) and the fixing metal wire (2) are made of copper.

6. A fiber discharge electrode according to any one of claims 2 to 5, characterized in that: It also comprises a sealing layer (5), wherein the sealing layer (5) is used to wrap the conductive column (1), the fixed metal wire (2), and the fixed section of the conductive fiber bundle (3), and is fixedly connected to the bottom end of the insulating sleeve (4).

7. A fiber discharge electrode according to claim 6, characterized in that: The sealing layer (5) is made of epoxy resin or silicone resin.

8. A method for preparing a fiber discharge electrode, characterized in that: include: Obtaining a conductive column (1), a fixed metal wire (2) and a conductive fiber bundle (3); Preliminarily fixing the fixed section of the conductive fiber bundle (3) on the conductive column (1); A fixed metal wire (2) is spirally wound around the circumference of a conductive column (1) to form a plurality of windings, so that a fixed section of the conductive fiber bundle (3) is tightly fixed between the conductive column (1) and the fixed metal wire (2), and during the spiral winding of the fixed metal wire (2), a gap is reserved between two adjacent windings at the extended position of the conductive fiber bundle (3), so that the extended section of the conductive fiber bundle (3) extends out through the gap; An insulating sleeve (4) is sleeved onto the extended section of the conductive fiber bundle (3); The fixed section of the conductive fiber bundle (3) is initially fixed on the conductive column (1) by winding.

9. The preparation method according to claim 8, characterized in that: The extension section of the conductive fiber bundle (3) is annular; the length of the annular extension section is greater than the height of the insulating sleeve (4); after the insulating sleeve (4) is sleeved, the conductive fiber bundle (3) extending out of the top of the insulating sleeve (4) is cut off so that the length of the extension section is the same as the height of the insulating sleeve (4).

10. The preparation method according to claim 9, characterized in that: After the insulating sleeve (4) is sleeved, a sealing layer (5) is coated on the outer layer of the fixed metal wire (2) to wrap the conductive column (1), the fixed metal wire (2) and the fixed section of the conductive fiber bundle (3), and the sealing layer (5) is fixed to the lower end of the insulating sleeve (4) to form an integrated structure.

11. The preparation method according to claim 10, characterized in that: The sealing layer (5) is formed by potting epoxy resin or silicone resin under vacuum conditions.

12. The preparation method according to claim 8, characterized in that: The conductive fiber bundle (3) is also subjected to any one of the following pretreatment steps before use; Pretreatment 1: Place the conductive fiber bundle in ethanol for ultrasonic cleaning and drying; Pretreatment 2: calcining the conductive fiber bundle at 800°C for 0.5-1h; Pretreatment 3: Under nitrogen protection, the conductive fiber bundle is electrified, the conductive fiber bundle is a carbon fiber bundle, the carbon fiber is made red, and after keeping it for 10 minutes, it is cooled under nitrogen protection.

Images