Needle of cathode wire and cathode wire

Abstract

According to the needle of the cathode wire and the cathode wire, the needle falling phenomenon of the cathode wire is completely eradicated by improving the structure of the needle of the cathode wire, so that the discharge performance of an electric dust remover is improved. Comprising a needle body and a welding piece, and the head end of the needle body serves as a discharging end; the welding piece can be at least partially melted in the welding process to form a molten pool so as to connect the tail end of the needle body with a supporting body of the cathode wire; the welding piece comprises a welding seat, the welding seat is of a conical structure and is provided with a large-diameter end and a small-diameter end, the large-diameter end is directly or indirectly connected to the tail end of the needle body, and the small-diameter end is used for directly or indirectly abutting against the supporting body. The cathode wire is high in structural strength, low in production cost and stable in performance, and the dust removal effect of the electric dust remover adopting the cathode wire is better than that of an electric dust remover adopting a traditional welding type cathode wire.

Description

Technical Field

[0001] This utility model relates to the technical field of electrostatic precipitators, specifically to a needle-punched cathode wire and a cathode wire. Background Technology

[0002] Needle-type cathode wires have become the main type of corona wire for electrostatic precipitators due to their advantages such as low corona initiation voltage, high strength, resistance to deformation, high efficiency in transmitting rapping force, and good dust removal effect. Needle-type cathode wires consist of a support body and a discharge body (i.e., needles). According to the connection method of the support body and the discharge body, needle-type cathode wires are mainly divided into welded cathode wires and riveted cathode wires. The manufacturing process of riveted cathode wires is more complex, costly, and has low production efficiency. Welded cathode wires are simple to process, low in cost, and have high production efficiency. However, welded cathode wires are prone to needle drop due to poor welding and false welding, which can negatively affect the dust removal efficiency of electrostatic precipitators. Utility Model Content

[0003] The purpose of this utility model is to provide a cathode wire needle and cathode wire. By improving the structure of the needle, the phenomenon of cathode wire falling off is eliminated, thereby improving the discharge performance of the electrostatic precipitator.

[0004] To achieve the above objectives, this utility model provides a cathode wire needle, which includes a needle body and a welding element. The head end of the needle body serves as a discharge end. During the welding process, the welding element can at least partially melt to form a molten pool to connect the tail end of the needle body to the support of the cathode wire. The welding element includes a welding seat, which has a conical structure and has a large-diameter end and a small-diameter end. The large-diameter end is directly or indirectly connected to the tail end of the needle body, and the small-diameter end is used to directly or indirectly abut against the support. During the welding process, heat transfer occurs from the small-diameter end to the large-diameter end, with the heat transfer cross-sectional area gradually increasing from the small-diameter end to the large-diameter end. This allows the resistance heat to spread evenly from the small-diameter end along the side wall of the welding seat towards the large-diameter end, enabling the welding seat to fully melt and form a complete molten pool. This avoids the formation of incomplete or false welds between the tail end of the needle body and the support. By adopting the welded cathode wire structure of this application, not only can the problems of low production efficiency and high cost of riveted cathode wires be solved, but the problem of needle drop caused by incomplete or false welds that easily occur in existing welded cathode wire processes can also be solved. The cathode wire structure of this application has high strength, low production cost, and stable performance. The dust removal effect of the electrostatic precipitator using the cathode wire of this application is better than that of the electrostatic precipitator using the traditional welded cathode wire.

[0005] Optionally, the welding member further includes a transition portion disposed at the large-diameter end, and the needle body is connected to the side of the transition portion away from the welding seat;

[0006] The size of the transition section is larger than the radial size of the needle body.

[0007] During the welding process, the transition section can protect the needle body and prevent welding spatter from forming on the needle body during resistance welding.

[0008] Optionally, the transition portion has a cylindrical structure, and the radial dimension of the large-diameter end is consistent with the radial dimension of the transition portion; this increases the welding area between the needle body and the support body. During the welding process, resistance heat is transferred from the large-diameter end to the transition portion, completely melting the surface of the transition portion in contact with the large-diameter end, thereby further improving the welding strength between the needle body and the support body.

[0009] Optionally, the plane where the small diameter end is located is defined as the reference plane, and the inclination angle of the side wall of the welding seat relative to the reference plane is 3° to 20°. When the inclination angle of the welding seat is within the above range, not only can weld beads be avoided, but also a complete molten pool can be formed after the welding seat and the transition part melt, thereby effectively avoiding the occurrence of incomplete welding and false welding.

[0010] Optionally, the welded component further includes a boss portion disposed on the end face of the small-diameter end, the boss portion having a cylindrical structure; the boss portion can instantly form a weld nugget, thereby guiding the resistance heat to the end face of the small-diameter end.

[0011] Optionally, the radial dimension of the boss portion is consistent with the radial dimension of the small diameter end; thereby making the end face of the small diameter end heat up evenly, which is beneficial to the uniformity of heat transfer from the small diameter end to the large diameter end.

[0012] Optionally, the needle punch is a one-piece molded structure; this processing method is relatively simple and facilitates mass production.

[0013] Optionally, the welding seat is a conical structure; or, the welding seat is a pyramidal structure; thereby ensuring that the end face of the small diameter end is heated evenly, which in turn facilitates the uniformity of heat transfer from the small diameter end to the large diameter end.

[0014] This application also provides a cathode wire, including a support and a needle, wherein the needle is formed by partially or completely melting the welded part in the aforementioned needle; the space between the needle body and the support is filled with a molten pool.

[0015] Optionally, each of the needle bodies is evenly spaced along the length of the support; and one of two adjacent needle bodies is located on one side of the radial direction of the support, while the other is located on the other side of the radial direction of the support; thereby forming a cathode line with a more uniform dust removal effect. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of this specification and, together with their description, serve to explain the principles of this specification.

[0017] Figure 1 This is a schematic diagram of the structure of the needle body and the welded component in an embodiment of this utility model;

[0018] Figure 2 This is a schematic diagram of the cathode wire structure.

[0019] Figures 1-2 middle:

[0020] 100, Support body; 200, Needle body; 300, Welding component; 301, Welding seat; 301a, Large diameter end; 301b, Small diameter end; 302, Transition section; 303, Boss section. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Please refer to Figures 1 to 2 , Figure 1 This is a schematic diagram of the structure of the needle body and the welded component in an embodiment of this utility model; Figure 2 This is a schematic diagram of the cathode wire structure.

[0023] Cathode wires can be classified into welded cathode wires and riveted cathode wires based on the connection method between the support body 100 and the discharge body (the discharge body is a needle, including the needle body 200). The support body 100 is the main structure of the cathode wire, responsible for fixing the discharge body in a specific position and withstanding various forces and vibrations that may occur during the discharge process. The discharge body is the key part of the cathode wire, responsible for generating discharge under the influence of an electric field, thereby ionizing the surrounding gas and forming plasma. In riveted cathode wires, the support body 100 and the discharge body are fixed by riveting. During processing, holes must first be drilled in all positions on the support body 100 where the discharge body will be installed, then the discharge body is inserted into the holes, and finally hammered into the holes to form the riveting. Riveted cathode wires have high strength and are less prone to needle loss. Electrostatic precipitators using riveted cathode wires operate stably and have good dust removal effects. However, the manufacturing process of riveted cathode wires is complex, costly, and inefficient. To reduce the complexity of the cathode wire manufacturing process, lower production costs, and improve production efficiency, welded cathode wires can be used. In welded cathode wires, the support body 100 and the discharge body are connected by resistance welding. Typically, the discharge body includes a needle body 200. During welding, the needle body 200 is pressed against the outer surface of the support body 100 before welding. However, due to the structure of the needle body 200 and the support body 100, the heat transfer between them is poor during welding, easily leading to incomplete fusion and phenomena such as false welds or incomplete welds. During the stacking, transportation, installation, commissioning, or vibration stages after processing, welded cathode wires will experience varying degrees of needle loss, directly causing a decrease in the discharge capacity of the welded cathode wire after the electrostatic precipitator is put into operation, thus affecting dust removal efficiency.

[0024] As shown in the figure, the welded cathode wire (hereinafter referred to as "cathode wire") for dust collectors of this utility model includes a support body 100 and a needle. The needle includes a needle body 200 and a welding element 300. The needle is an integrally formed structure, cast from materials such as stainless steel. This processing method is relatively simple and easy to mass-produce. During the welding process, the welding element 300 can at least partially melt to form a molten pool to connect the needle body 200 and the support body 100. The welding element 300 specifically includes a welding seat 301, which has a conical structure with a large-diameter end 301a and a small-diameter end 301b. The radial dimension of the large-diameter end 301a is larger than that of the small-diameter end 301b. The large-diameter end 301a is directly or indirectly connected to the tail end of the needle body 200. The size of the large-diameter end 301a can be greater than or equal to the radial dimension of the tail end of the needle body 200. The small-diameter end 301b is used to abut against the support body 100. In this application, the tip of the needle body 200 is the discharge end, which can be spike-shaped (e.g., Figure 1 and Figure 2 (As shown in the image), it can also be spherical or the like, and the needle body 200 can also be a bent linear structure. Figure 1 and Figure 2 The structure of the needle body 200 is shown only as an example and does not constitute a limitation on the structure of the needle body 200. Those skilled in the art can choose the desired needle body 200 structure as needed.

[0025] Before welding, the small diameter end 301b is pressed against the outer surface of the support body 100, and a current circuit is established between the support body 100 and the needle body 200. At this time, the small diameter end 301b will melt first at the contact point between the support body 100 and the needle body 200, and then the resistance heat will gradually spread along the extension direction of the welding seat 301 until the large diameter end 301a connected to the tail end of the needle body 200. In this process, heat transfer occurs from the small-diameter end 301b to the large-diameter end 301a, with the heat transfer cross-sectional area gradually increasing from the small-diameter end 301b to the large-diameter end 301a. This allows the resistance heat to spread evenly from the small-diameter end 301b along the sidewall of the welding seat 301 towards the large-diameter end 301a, enabling the welding seat 301 to fully melt and form a complete molten pool. This avoids the formation of incomplete or false welds between the tail end of the needle body 200 and the support body 100. By adopting the welded cathode wire structure of this application, not only can the problems of low production efficiency and high cost of riveted cathode wires be solved, but the problems of needle drop caused by incomplete or false welds that are prone to occur in existing welded cathode wire processes can also be solved. The cathode wire structure in this application has high strength, low production cost, and stable performance. The dust removal effect of the electrostatic precipitator using the cathode wire of this application is better than that of the electrostatic precipitator using the traditional welded cathode wire.

[0026] In one specific embodiment, the welding member 300 further includes a transition portion 302 disposed at the large-diameter end 301a, and the needle body 200 is connected to the side of the transition portion 302 away from the welding seat 301; the size of the transition portion 302 is larger than the radial dimension of the needle body 200. The transition portion 302 extends a certain distance axially in the needle body 200 and is located between the needle body 200 and the welding seat 301. The needle body 200, the transition portion 302 and the welding seat 301 are concentrically arranged, and the projection range of the transition portion 302 in the axial direction of the needle body 200 covers the projection range formed on the needle body 200; thus, during the welding process, the transition portion 302 can protect the needle body 200 and prevent welding spatter from forming on the needle body 200 during resistance welding.

[0027] Optionally, the transition portion 302 has a cylindrical structure, and the radial dimension of the large-diameter end 301a is consistent with the radial dimension of the transition portion 302. This increases the welding area between the needle body 200 and the support body 100. During the welding process, resistance heat is transferred from the large-diameter end 301a to the transition portion 302, completely melting the surfaces of the transition portion 302 and the large-diameter end 301a in contact, thereby further improving the welding strength between the needle body 200 and the support body 100.

[0028] In a more specific embodiment, the radial dimension difference between the transition portion 302 and the needle body 200 is approximately 1mm-3mm, and the axial dimension of the transition portion 302 in the needle body 200 is positively correlated with the diameter of the needle body 200. By using the transition portion 302, a strong and reliable welded joint can be formed after welding. The strong and reliable welded joint can effectively prevent needle drop during stacking, transportation, installation and operation of the equipment, thereby ensuring the dust removal performance of the electrostatic precipitator.

[0029] In the above embodiment, the plane where the small-diameter end 301b is located is defined as the reference plane, which extends along the axial direction of the support 100. The inclination angle α of the sidewall of the welding seat 301 relative to the reference plane is 3° to 20°. If the inclination angle is greater than 20°, the length of the welding seat 301 in the axial direction of the needle body 200 will be too long, resulting in the molten pool of the small-diameter end 301b overflowing and forming a weld bead, which cannot be connected to the bottom end of the needle body 200. If the inclination angle is less than 3°, the length of the welding seat 301 in the axial direction of the needle body 200 will be too short, resulting in a large resistance heat transfer gradient and low heat at the large-diameter end 301a, which will not be able to form a complete molten pool and will also result in a cold weld. Therefore, when the inclination angle of the welding seat 301 is within the above range, it can not only avoid the formation of weld beads, but also ensure that the welding seat 301 and the transition part 302 melt to form a complete molten pool, thereby effectively avoiding the occurrence of cold welds and false welds.

[0030] In some embodiments, the weld member 300 further includes a boss portion 303, which is disposed on the end face of the small-diameter end 301b and has a cylindrical structure. That is, during the welding process, the small-diameter end 301b is pressed against the outer wall surface of the support 100 by the boss portion 303, and the boss portion 303 can form a weld nugget instantly, thereby guiding the resistance heat to the end face of the small-diameter end 301b; optionally, the radial dimension of the boss portion 303 is consistent with the radial dimension of the small-diameter end 301b, so that the end face of the small-diameter end 301b is heated evenly, which is beneficial to the uniformity of heat transfer from the small-diameter end 301b to the large-diameter end 301a.

[0031] In the aforementioned technical solution, the welding seat 301 is specifically a conical structure or a pyramidal structure. When the welding seat 301 is a conical structure, the cross-section perpendicular to its central axis is circular, meaning that the end faces of the large-diameter end 301a and the small-diameter end 301b are circular. In this case, if a transition portion 302 is provided at the large-diameter end 301a, the edge of the large-diameter end 301a coincides with the edge of the transition portion 302. Similarly, if a boss portion 303 is provided at the small-diameter end 301b, the edge of the small-diameter end 301b coincides with the edge of the transition portion 302. The edge of the weld base 301 coincides with the edge of the boss portion 303. When the weld base 301 is a pyramidal structure, the cross section perpendicular to its central axis is a polygon; for example, it can be an equal hexagon or an equal octagon. In this case, if a transition portion 302 is provided at the large-diameter end 301a, each vertex of the polygon at the large-diameter end 301a is tangent to the edge of the transition portion 302. Similarly, if a boss portion 303 is provided at the small-diameter end 301b, each vertex of the polygon at the small-diameter end 301b is tangent to the edge of the boss portion 303. Of course, in other technical solutions, the boss portion 303 and the transition portion 302 can also be prisms. By providing a weld base 301 with a conical or pyramidal structure, the resistance heat of the small-diameter end 301b can be transferred to the large-diameter end 301a to form a complete molten pool. In the technical solution of this application, the weld base 301 is completely melted to form a molten pool, and the transition portion 302 is at least partially melted to form a molten pool. Figure 2 The state shown.

[0032] In other embodiments of this application, a cathode wire is also provided, comprising a support 100, a needle body 200, and the remaining portion of a partially melted weldment 300. That is, the cathode wire includes a support 100 and a needle, which is formed by the aforementioned needle body 200 and the partially melted weldment 300. A molten pool is formed between the needle body 200 and the support 100. In this way, the welding strength between the needle and the support 100 is improved.

[0033] The overall structure of the cathode wire is illustrated below with a specific embodiment. In this embodiment, the support body 100 is provided with a plurality of needles, each needle being evenly spaced along the length of the support body 100; and one of two adjacent needles is located on one side of the radial direction of the support body 100, and the other is located on the other side of the radial direction of the support body 100; that is, the needle body 200 of each needle is arranged crisscrossingly from top to bottom along the left and right sides of the support body 100; thereby forming a cathode wire with a more uniform dust removal effect.

[0034] In a more specific example, the distance between two adjacent needle bodies 200 on the same side is between 50mm and 100mm, the diameter of the needle body 200 is between 1mm and 5mm, and the length of the needle body 200 can be set according to the electric field, generally controlled between 5mm and 50mm.

[0035] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A needle-punching method for cathode wires, characterized in that, It includes a needle body (200) and a welding element (300), the head end of the needle body (200) serving as a discharge end; the welding element (300) can at least partially melt during the welding process to form a molten pool to connect the tail end of the needle body (200) to the support body (100) of the cathode wire. The welding element (300) includes a welding seat (301), which has a conical structure and has a large-diameter end (301a) and a small-diameter end (301b). The large-diameter end (301a) is directly or indirectly connected to the tail end of the needle body (200), and the small-diameter end (301b) is used to directly or indirectly abut against the support (100).

2. The needle punching of the cathode wire according to claim 1, characterized in that, The weldment (300) further includes a transition portion (302) disposed at the large diameter end (301a), and the needle body (200) is connected to the side of the transition portion (302) away from the weldment seat (301); The size of the transition portion (302) is larger than the radial dimension of the needle body (200).

3. The needle punching of the cathode wire according to claim 2, characterized in that, The transition portion (302) has a cylindrical structure, and the radial dimension of the large-diameter end (301a) is consistent with the radial dimension of the transition portion (302).

4. The needle punching of the cathode wire according to claim 3, characterized in that, The plane where the small-diameter end (301b) is located is defined as the reference plane, and the angle between the side wall of the welding seat (301) and the reference plane is 3° to 20°.

5. The needle punching of the cathode wire according to claim 2, characterized in that, The welded part (300) further includes a boss (303), which is disposed on the end face of the small diameter end (301b) and has a cylindrical structure.

6. The needle punching of the cathode wire according to claim 5, characterized in that, The radial dimension of the boss portion (303) is consistent with the radial dimension of the small diameter end (301b).

7. The needle punching of the cathode wire according to any one of claims 1-6, characterized in that, The welding base (301) is in the form of a cone structure; or, the welding base (301) is in the form of a pyramid structure.

8. The needle punching of the cathode wire according to any one of claims 1-6, characterized in that, The needle-punching of the cathode wire is a one-piece molded structure.

9. A cathode wire, characterized in that, It includes a support (100) and a needle, the needle being formed by partially or completely melting the welded part (300) of the needle according to any one of claims 1-8; the needle body (200) and the support (100) are filled with a molten pool.

10. The cathode wire according to claim 9, characterized in that, Each of the needle bodies (200) is evenly spaced along the length of the support (100); and one of two adjacent needle bodies (200) is located on one side of the radial direction of the support (100), and the other is located on the other side of the radial direction of the support (100).

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