Electrode assembly for electrostatic eliminator and optimization method thereof

Abstract

The invention discloses an electrode assembly for a static electricity eliminator and an optimization method thereof, and belongs to the field of static electricity elimination. Comprising a discharge electrode seat and a discharge electrode, and is provided with a tubular discharge electrode and a spring plug-in; the spring plug-in is a rod-shaped structural member; the front end of the rod-shaped structural member of the spring insert is inserted into the tubular discharge electrode; the rear end of the spring plug-in is electrically connected with a high-voltage component in the electrostatic eliminator rod body; the tubular discharge electrode and the spring plug-in penetrate through the discharge electrode seat; and the tubular discharge electrode, the spring plug-in and the discharge electrode seat integrally form a discharge electrode assembly. By adopting the tubular discharge electrode structure, the discharge area of the front end part of the discharge electrode is greatly increased, and on the basis of considering the discharge electric field intensity of the discharge electrode, by optimizing the discharge electrode assembly structure, the tangential electric field intensity of the surface of the direct-current ion rod body is greatly reduced, and the migration of charges on the surface of the direct-current ion rod body is reduced; the surface flashover between two adjacent positive and negative discharge electrodes can be effectively suppressed, and the surface insulation performance of the direct current ion rod is further enhanced.

Description

Technical Field

[0001] This invention belongs to the field of static electricity elimination, and particularly relates to an electrode assembly for a static electricity eliminator and its optimization method. Background Technology

[0002] Ion bars are the most commonly used type of static eliminator, widely used in static control in industrial production processes. DC ion bars, in particular, are favored for applications with high static electricity generation due to their high ion generation efficiency, long operating distance, and strong static elimination capabilities.

[0003] However, due to the inherent working characteristics of DC ion bars (hereinafter referred to as ion bars) and the requirement to meet high static electricity elimination capabilities, their operating voltage is relatively high (the voltage applied to the discharge electrode is relatively high), and the multiple positive and negative discharge electrodes are arranged in a positive-negative interval (that is, each positive discharge electrode is arranged adjacent to each negative discharge electrode). This makes it very easy for surface flashover (surface insulation breakdown) to occur between the positive and negative discharge electrodes on the surface of the DC ion bar (hereinafter referred to as the bar surface), which can lead to damage to the ion bar.

[0004] The discharge electrode assembly (also known as the electrode needle assembly) is a crucial electrical structural component of a DC ion bar. Due to the operational requirements of discharge, the high voltage applied to the discharge electrode must be exposed. This creates a tangential electric field on the surface of the DC ion bar between the positive and negative discharge electrodes, which is one of the key causes of surface flashover on the bar surface. Due to limitations in the extrusion process, there are significant limitations in optimizing the surface insulation structure of the bar core (body); however, the discharge electrode assembly utilizes machining and injection molding processes, thus allowing for greater flexibility in optimizing its surface insulation structure.

[0005] Existing electrode assembly structures can be broadly classified into two categories: The first category, represented by the invention patent "An Electrode Assembly for an Electrostatic Eliminator" disclosed in patent CN 103716975 B (authorization announcement date: March 2, 2016), involves an electrode assembly in which the electrodes and / or metal parts do not directly contact the core (body) or surface (hereinafter referred to as the rod surface) of the DC ion bar. The second category, represented by the utility model patent "An Electrode Needle Assembly for an Electrostatic Eliminator" disclosed in patent CN 219592680 U (authorization announcement date: August 25, 2023), involves an electrode assembly in which the electrodes and / or metal parts directly contact the core (body) or surface of the DC ion bar. Both types of electrode assemblies employ an electrode needle structure with a pointed conical front end (also known as the tip) and a small radial diameter. The mechanical parameters of such electrode needles are typically as follows:

[0006] 1) Electrode diameter: typically 0.5 to 2 mm;

[0007] 2) Electrode length: greater than 10mm;

[0008] 3) Grinding angle (also known as grinding cone angle): 0~70°.

[0009] The existing technical solutions have the following technical defects:

[0010] Because it adopts an electrode needle structure with a pointed conical front end and a small diameter, and the voltage applied by the DC ion bar to the electrode needle is relatively high, the surface tangential electric field generated is large, which easily causes the migration of surface charge of the DC ion bar, and then causes surface flashover between the positive and negative discharge electrodes, resulting in surface insulation breakdown and a decrease in the discharge performance.

[0011] If the electrode needles and / or metal fasteners of the electrode assembly are in direct contact with the core (body) or surface of the DC ion rod, the resulting surface tangential electric field will become larger, making it easier to cause the migration of surface charge, triggering strong surface flashover between the positive and negative discharge electrodes, causing surface insulation breakdown, reduced discharge performance, or even loss of discharge capability.

[0012] Because it adopts the aforementioned cylindrical (also known as rod or bar) electrode needle structure with a pointed conical front end and a small radial diameter, and the DC ion bar applies a high voltage to the electrode needle, the electrode needle suffers greater and faster electrolytic erosion, which in turn leads to a faster decline in ion release performance and a shorter duration of the DC ion bar's electrostatic discharge performance.

[0013] Therefore, optimizing the structure of the discharge electrode assembly to reduce the tangential electric field on the surface of the DC ion bar, suppress surface flashover between the positive and negative discharge electrodes, and improve the surface insulation performance of the DC ion bar is an important research direction. Summary of the Invention

[0014] The technical problem to be solved by this invention is to provide an electrode assembly for an electrostatic eliminator and its optimization method. It adopts a tubular discharge electrode structure, which greatly increases the discharge area at the front end (also known as the tip) of the discharge electrode. The structure of the discharge electrode remains basically unchanged before and after electro-erosion and wear, the discharge performance at the front end of the discharge electrode remains basically unchanged, and the electrostatic elimination performance is effectively maintained. While taking into account the discharge electric field strength of the discharge electrode (i.e., the electrostatic elimination performance of the ion rod), by optimizing the discharge electrode assembly structure and adopting a tubular discharge electrode structure, the tangential electric field strength on the surface of the DC ion rod is significantly reduced, reducing the migration of surface charge and effectively suppressing surface flashover between two adjacent positive and negative discharge electrodes, thereby enhancing the surface insulation performance of the DC ion rod.

[0015] The technical solution of the present invention is: to provide an electrode assembly for an electrostatic eliminator, comprising a discharge electrode holder and a discharge electrode, characterized in that:

[0016] Set a tubular discharge electrode and a spring insert;

[0017] The spring insert is a rod-shaped structural component;

[0018] The front end of the spring insert rod-shaped structure is inserted into the tubular discharge electrode;

[0019] The rear end of the spring insert is electrically connected to a high-voltage component inside the static eliminator rod.

[0020] The tubular discharge electrode and spring insert are disposed through the discharge electrode holder;

[0021] The tubular discharge electrode, spring insert, and discharge electrode holder together constitute a discharge electrode assembly.

[0022] Specifically, the tubular discharge electrode and spring insert are positioned at the center of the discharge electrode holder.

[0023] Specifically, a boss is provided in the middle and rear part of the spring insert, dividing the rod-shaped structure into a front half of a column and a rear half of a spring pin; the column is inserted into the rear end of the tubular discharge electrode, and the two are interference-fitted; the spring pin is electrically connected to the high-voltage component inside the static eliminator rod.

[0024] Furthermore, the aforementioned boss constitutes an insertion positioning / limiting structure between the spring insert and the tubular discharge electrode, and between the tubular discharge electrode and the discharge electrode seat.

[0025] Specifically, the wall thickness range of the tubular discharge electrode is as follows:

[0026] 0.01mm≤h 壁厚 ≤1mm;

[0027] The outer diameter range of the tubular discharge electrode is:

[0028] 1mm≤d 外径 ≤10mm.

[0029] Furthermore, the discharge electrode assembly is fixedly mounted on the core surface structure of the DC ion bar.

[0030] The electrode assembly for an electrostatic eliminator described in this invention increases the discharge area at the tip of the discharge electrode by adopting a tubular discharge electrode structure. While taking into account the discharge electric field strength and ion release capability of the discharge electrode, it reduces the tangential electric field strength on the surface of the DC ion rod, reduces charge migration on the surface of the rod, effectively suppresses surface flashover between two adjacent positive and negative discharge electrodes, and thus enhances the insulation performance of the surface of the DC ion rod.

[0031] The present invention also provides a method for optimizing the electrode assembly for the above-mentioned static eliminator, characterized by comprising at least the following steps:

[0032] 1) Construct simulation structural models of needle-type and tubular discharge electrode assemblies;

[0033] 2) Apply the electrostatic field mathematical model to the entire simulation space respectively;

[0034] 3) Mesh the simulation domain for the needle-type discharge electrode assembly and perform simulation calculations;

[0035] 4) Obtain the tangential electric field intensity on the surface of the rod where the discharge electrode of the needle discharge electrode assembly is located and the electric field intensity at the tip of the discharge electrode;

[0036] 5) Use the outer diameter and wall thickness of the tubular discharge electrode as optimization variables, and set upper and lower limits for the optimization variables respectively;

[0037] 6) Use the tangential electric field intensity on the surface of the rod containing the needle-type discharge electrode assembly and the tubular discharge electrode, as well as the electric field intensity at the tip of the discharge electrode, as evaluation technical parameters, and use these evaluation technical parameters to set the optimization objective function;

[0038] 7) The Nelder-Mead method is used to optimize and solve the above objective function;

[0039] 8) Mesh the simulation domain for the tubular discharge electrode, perform simulation calculations, and obtain the optimal parameter values ​​for the outer diameter and wall thickness of the tubular discharge electrode, as well as the corresponding tangential electric field strength on the surface of the rod where the discharge electrode is located and the electric field strength at the tip of the discharge electrode.

[0040] 9) Compare and analyze the technical characteristics of the tangential electric field strength on the surface of the rod and the electric field strength at the tip of the electrode when comparing the needle-type discharge electrode assembly and the tubular discharge electrode, and determine the technical effect of using the tubular discharge electrode.

[0041] Specifically, in step 1), the simulation structural models of the needle-type discharge electrode assembly and the tubular discharge electrode assembly adopt the same positive and negative electrode spacing and the same rod surface structure.

[0042] When constructing the simulation structural model, only the surface structure of the rod between a pair of positive and negative electrodes was constructed;

[0043] In step 2), the mathematical model of the electrostatic field is:

[0044]

[0045] Where V is the electrode voltage, in units of V; ε0 is the vacuum permittivity, ε0 ​​= 8.854187817 × 10⁻⁶. -12 F / m, unit F / m; εr is the relative permittivity of the material, which is dimensionless; the positive and negative electrode voltages are set to +20kV and -20kV, respectively.

[0046] The formula for calculating the minimum value of the objective function is as follows:

[0047]

[0048] In the above formula: E AVG放电尖端:圆管 E represents the average electric field strength (in V / m) at the surface of the discharge tip of the tubular discharge electrode. AVG Discharge tip: The cone-shaped discharge electrode has an average electric field intensity (unit: V / m) on its surface at the discharge tip. tx:圆管 |) represents the maximum absolute value (unit: V / m) of the tangential electric field intensity on the surface of the rod containing the tubular discharge electrode. tx:圆锥 ) represents the maximum absolute value of the tangential electric field intensity on the surface of the rod where the needle-type discharge electrode is located (unit: V / m), d 外径 h is the outer diameter of the tubular discharge electrode (unit: mm). 壁厚 The wall thickness of the tubular discharge electrode (unit: mm).

[0049] The optimized method described in this invention reduces the tangential electric field intensity on the surface of the DC ion rod by employing a tubular electrode assembly, thereby reducing the migration of surface charge and effectively suppressing surface flashover between the positive and negative discharge electrodes. This enhances the insulation performance of the DC ion rod surface while also ensuring its discharge performance and the ion rod's charge dissipation capability.

[0050] Compared with the prior art, the advantages of the present invention are:

[0051] 1. The technical solution of the present invention adopts a tubular discharge electrode structure with a larger diameter front end (also known as the top) structure compared with the pointed conical electrode needle structure. Therefore, it effectively reduces the tangential electric field intensity on the surface of the ion rod, reduces the migration of surface charge, effectively suppresses the surface flashover between two adjacent positive and negative discharge electrodes, and thus enhances the surface insulation performance of the DC ion rod.

[0052] 2. The technical solution of the present invention adopts a tubular discharge electrode structure with a smaller wall thickness and a larger diameter, which greatly increases the discharge area at the front end. Therefore, it takes into account the discharge performance and ion output of the original pointed conical electrode needle structure with a smaller diameter. On the basis of taking into account the discharge electric field strength and ion release capability (corresponding to the power elimination capability) of the discharge electrode, the power elimination performance of the DC ion rod is effectively taken into account.

[0053] 3. Compared to electrode needle structures with a pointed conical shape and a small diameter, which gradually become blunt after electro-erosion and corrosion wear, resulting in decreased discharge performance and weakened current dissipation performance, the electrode assembly using the tubular discharge electrode described in this technical solution increases the discharge area at the front end of the electrode needle due to the use of a tubular discharge electrode structure with a smaller wall thickness and a larger diameter. Therefore, even after long-term use, its structure remains basically unchanged before and after electro-erosion and corrosion wear, its discharge performance remains basically unchanged, and the overall current dissipation performance of the ion rod is effectively maintained. Attached Figure Description

[0054] Figure 1 This is a flowchart of the method for optimizing the discharge electrode assembly of the present invention;

[0055] Figure 2a This is a front view of the discharge electrode assembly of the present invention;

[0056] Figure 2b for Figure 2a Sectional view along axis AA;

[0057] Figure 3 This is a perspective view of the electrode assembly of the present invention from a bottom angle;

[0058] Figure 4 This is a top-view perspective view of the discharge electrode assembly of the present invention;

[0059] Figure 5 This is an exploded axial view of the discharge electrode assembly of the present invention;

[0060] Figure 6 A schematic diagram of the surface simulation structure of the rod body of a prior art discharge electrode assembly;

[0061] Figure 7 This is a schematic diagram of the surface simulation structure of the rod body of the discharge electrode assembly of the present invention;

[0062] Figure 8 This is a schematic diagram of the tangential electric field distribution on the surface of the rod of a prior art discharge electrode assembly;

[0063] Figure 9 This is a schematic diagram of the tangential electric field distribution on the surface of the rod of the discharge electrode assembly of the present invention;

[0064] Figure 10-1 A schematic diagram of the discharge electrode connection line (center line in the X direction) on the surface of the existing discharge electrode assembly rod;

[0065] Figure 10-2 This is a schematic diagram of the discharge electrode connection line (center line in the X direction) on the surface of the discharge electrode assembly rod of the present invention;

[0066] Figure 10-3 This is a schematic diagram of the tangential electric field distribution along the line connecting the discharge electrodes (center line in the X direction) on the surface of the discharge electrode assembly rod of the present invention in the prior art;

[0067] Figure 11 This is a schematic diagram of the discharge tip surface of a prior art discharge electrode assembly;

[0068] Figure 12 This is a schematic diagram of the discharge tip surface of the discharge electrode assembly of the present invention.

[0069] In the figure: 1 is a spring insert, 1-a is one end of the spring pin of the spring insert, 1-b is one end of the cylinder of the spring insert, 1-c is a boss, 2 is a tubular discharge electrode, 2' is a conical discharge electrode, 3 is a discharge electrode holder, 3' is an existing discharge electrode holder, 4 is the surface structure of the DC rod core, 4' is the surface structure of the existing DC rod core, and 5 is a high-voltage component. Detailed Implementation

[0070] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0071] The technical solution of this invention, while taking into account the discharge electric field strength of the discharge electrode (i.e., the discharge performance of the ion rod), optimizes the structure of the discharge electrode assembly to significantly reduce the tangential electric field strength on the surface of the DC ion rod, reduce the migration of surface charge, effectively suppress surface flashover between two adjacent positive and negative discharge electrodes, and thus enhance the surface insulation performance of the DC ion rod.

[0072] To achieve the above-mentioned objectives, the following technical solution is implemented:

[0073] like Figures 2a to 5 As shown in the figure, in the technical solution of the present invention, a tubular discharge electrode 2 is disposed through the discharge electrode holder 3. This tubular discharge electrode is inserted into one end 1-b of the cylinder of a spring insert 1; one end 1-a of the spring pin of the spring insert 1 is electrically connected to the high voltage component 5 inside the ion bar.

[0074] The aforementioned spring insert 1, equipped with a tubular discharge electrode, is inserted into the axial center of a discharge electrode holder 3, forming a discharge electrode assembly, which is mounted on the core surface structure 4 of a DC ion bar (see [reference]). Figure 7 (as shown in the image).

[0075] The spring insert has a rod body 1, and an annular boss 1-c is provided in the middle of the rod body. The entire rod body is divided by the boss into the cylindrical end 1-b of the spring insert and the spring pin end 1-a of the spring insert.

[0076] One end 1-b of the cylindrical part of the spring insert is inserted into the tubular discharge electrode 2, and one end 1-a of the spring pin of the spring insert is electrically connected to the high-voltage component 5 inside the ion bar.

[0077] The aforementioned boss 1-c constitutes an insertion positioning / limiting structure between the spring insert 1, the tubular discharge electrode 2, and the discharge electrode seat 3.

[0078] To optimize the structural parameters of the tubular discharge electrode assembly in this technical solution to achieve optimal discharge performance, and to compare it with existing discharge electrode assemblies, the following structural optimization method and simulation comparison experiment were designed:

[0079] Simulation structural models of existing conical-needle-shaped discharge electrode assemblies and the tubular discharge electrode assembly of this technical solution are constructed, and electrostatic field mathematical models are applied to the entire simulation space for each. First, the simulation domain of the existing conical-needle-shaped discharge electrode assembly is meshed, and simulation calculations are performed; the tangential electric field intensity on the surface of the rod where the existing discharge electrode assembly is located and the electric field intensity at the tip of the discharge electrode are obtained.

[0080] The outer diameter and wall thickness of the tubular discharge electrode in this technical solution are used as optimization variables, and upper and lower limits of the optimization variables are set according to the design requirements.

[0081] The tangential electric field intensity on the surface of the rod containing the existing conical-needle-shaped discharge electrode and the tubular discharge electrode of this technical solution, as well as the electric field intensity at the tip of the discharge electrode, are used as evaluation technical parameters. These evaluation technical parameters are then used to set an optimization objective function to minimize the objective function.

[0082]

[0083] The Nelder-Mead method (a derivativeless optimization algorithm, an algorithm for finding local minima of multivariate functions) is used to optimize and solve the above objective function.

[0084] The simulation domain of the tubular discharge electrode in this technical solution is meshed, and simulation calculations are performed to obtain the optimal parameter values ​​of the outer diameter and wall thickness of the tubular discharge electrode, as well as the corresponding tangential electric field intensity on the surface of the rod where the tubular discharge electrode is located and the electric field intensity at the tip of the discharge electrode.

[0085] By comparing and analyzing the technical characteristics of the tangential electric field strength on the surface of the rod and the electric field strength at the tip of the discharge electrode of the tubular discharge electrode assembly in this technical solution, the feasibility of this technical solution is verified.

[0086] The specific implementation process is as follows:

[0087] 1. See Figures 2a to 5 As shown, a tubular discharge electrode 2 is provided and inserted into one end of the cylinder 1-b of a spring insert 1, so that the two are interference-fitted.

[0088] 2. One end of the spring pin 1-a of the spring insert 1 is electrically connected to the high-voltage component 5 inside the ion bar.

[0089] 3. Insert the spring insert 1 equipped with the tubular discharge electrode 2 into the center of the shaft of a discharge electrode holder 3, thus forming a discharge electrode assembly together with the discharge electrode holder.

[0090] 4. The discharge electrode holder 3 can be assembled onto the DC core surface structure 4 of the DC ion bar by means of installation threads or snaps.

[0091] Example:

[0092] To obtain the optimal structural parameters of the discharge electrode assembly in this technical solution, thereby reducing the tangential electric field intensity on the rod surface, minimizing charge migration on the rod surface, effectively suppressing surface flashover between the positive and negative discharge electrodes, enhancing the surface insulation performance of the DC ion rod, and simultaneously considering its discharge performance; and to compare and verify with existing discharge electrode assemblies, the following structural optimization method and simulation comparison experiments were specifically designed:

[0093] 1) See Figure 6 , Figure 7 As shown, based on the discharge electrode assembly of the existing technology and the present technical solution, a simulation structure model of the surface electric field between the positive and negative electrodes of the DC ion rod is constructed.

[0094] To facilitate a reasonable data comparison, the two simulation structural models mentioned above use the same positive and negative electrode spacing (e.g., 100 mm) and the same rod surface structure (overall dimensions).

[0095] To simplify the calculation, only the surface structure of the rod between the positive and negative electrodes was constructed; since the positive and negative electrodes are symmetrically and regularly arranged, this simplified structure is sufficient to meet the research needs.

[0096] 2) Apply the electrostatic field mathematical model to the entire simulation space:

[0097]

[0098] Where V is the electrode voltage, in units of V; ε0 is the vacuum permittivity, ε0 ​​= 8.854187817 × 10⁻⁶. -12 F / m, unit F / m; ε r is the relative permittivity of the material, which is dimensionless; the positive and negative electrode voltages are set to +20kV and -20kV, respectively.

[0099] 3) First, mesh the simulation domain for the existing conical discharge electrode assembly and perform simulation calculations; then obtain the tangential electric field intensity E on the surface of the rod where the existing discharge electrode assembly is located. tx:圆锥 (See Figure 8 (as shown) and the average electric field strength E at the tip of the discharge electrode AVG放电尖端:圆锥 =1.7688E7[V / m].

[0100] 4) The outer diameter and wall thickness of the tubular discharge electrode in this technical solution are used as optimization variables, and upper and lower limits of the optimization variables are set according to the design requirements (e.g., [2.4mm≤d)). 外径 ≤8mm]、[0.05mm≤h 壁厚 ≤0.3mm]).

[0101] 5) Using the tangential electric field strength on the surface of the rod where the discharge electrode is located and the average electric field strength at the tip of the discharge electrode in existing technologies and this technical solution as evaluation parameters, and using these evaluation parameters to set the optimization objective function, and minimizing the objective function:

[0102]

[0103] In the above formula: E AVG放电尖端:圆管 E represents the average electric field strength (unit: V / m) on the surface of the discharge tip of the tubular discharge electrode in this technical solution. AVG放电尖端:圆锥 The average electric field intensity (unit: V / m) on the surface of the discharge tip of the conical-needle-shaped discharge electrode in the existing technical solution is MAX(E). tx:圆管 MAX(E) represents the maximum absolute value (unit: V / m) of the tangential electric field intensity on the surface of the rod where the tubular discharge electrode is located in this technical solution. tx:圆锥 ) represents the maximum absolute value (unit: V / m) of the tangential electric field intensity on the surface of the rod containing the conical-needle-shaped discharge electrode in the existing technical solution, d 外径 h is the outer diameter of the tubular discharge electrode in this technical solution (unit: mm). 壁厚 The wall thickness of the tubular discharge electrode in this technical solution is shown in mm.

[0104] The above objective function is set to reduce the tangential electric field strength on the surface of the rod while taking into full account the electric field strength of the electrode discharge (i.e., the discharge capability of the ion rod).

[0105] 6) The Nelder-Mead method is used to optimize and solve the above objective function.

[0106] Mesh generation was performed on the simulation domain of the tubular discharge electrode assembly in this technical solution, and simulation calculations were executed to obtain the optimal parameter values ​​(d) for the outer diameter and wall thickness of the tubular discharge electrode. 外径 =5.078125 [mm], h 壁厚 =0.05 [mm]) and the corresponding tangential electric field intensity E on the surface of the rod where the discharge electrode is located. tx:圆管 (See Figure 9 (as shown) and the average electric field strength E at the tip of the discharge electrode AVG放电尖端:圆管 =6.8865E6[V / m].

[0107] 7) See Figure 10-1 , Figure 10-2, Figure 10-3 As shown, by comparing and analyzing the technical characteristics of the tangential electric field intensity on the surface of the rod where the existing conical-needle-shaped discharge electrode assembly and the tubular discharge electrode assembly of this technical solution are located, it can be seen that the tangential electric field intensity on the surface of the rod where the tubular discharge electrode assembly of this technical solution is located is significantly lower than that on the surface of the rod of the existing conical-needle-shaped discharge electrode assembly.

[0108] 8) See Figure 11 , Figure 12 As shown, although the average electric field strength at the tip of the tubular discharge electrode in this technical solution is lower than that at the tip of the existing conical-needle discharge electrode, the surface area of ​​the tip of the tubular discharge electrode in this technical solution is larger. Figure 12 The black area located at the front end of the discharge electrode (2-1) (i.e., the discharge area is 2.2607E-6m²) 2 This is much larger than the surface area of ​​the discharge electrode tip of the existing conical-needle discharge electrode. Figure 11 The black area located 2'-1" at the front end of the discharge electrode (i.e., the discharge area is 1.0449E-7m²) 2 This means that the ion-generating area at the tip of the tubular discharge electrode has increased; thus partially compensating for the reduction in the number of ions generated per unit discharge surface due to the decrease in discharge intensity.

[0109] In summary, the technical solution of the present invention, by adopting a tubular discharge electrode structure, reduces the tangential electric field intensity on the surface of the discharge electrode rod while taking into account both the discharge electric field strength and ion release capability (corresponding to the power elimination capability). This reduces the migration of charge on the rod surface, effectively suppresses surface flashover between the positive and negative discharge electrodes, enhances the surface insulation performance of the DC ion rod, and also takes into account its discharge performance.

[0110] This invention can be widely used in the design and production of DC ion bars and their discharge electrode components.

Claims

1. An electrode assembly for an electrostatic eliminator, comprising a discharge electrode holder and a discharge electrode, characterized in that: Set a tubular discharge electrode and a spring insert; The spring insert is a rod-shaped structural component; The front end of the spring insert rod-shaped structure is inserted into the tubular discharge electrode; The rear end of the spring insert is electrically connected to a high-voltage component inside the static eliminator rod. The tubular discharge electrode and spring insert are disposed through the discharge electrode holder; The tubular discharge electrode, spring insert, and discharge electrode holder together constitute a discharge electrode assembly.

2. The electrode assembly for an electrostatic eliminator according to claim 1, characterized in that: The tubular discharge electrode and spring insert are positioned at the center of the discharge electrode holder.

3. The electrode assembly for an electrostatic eliminator according to claim 1, characterized in that... The spring insert has a boss at its middle and rear part, which divides the rod-shaped structure into a column in the front half and a spring pin in the rear half. The column is inserted into the rear end of the tubular discharge electrode, and the two are interference-fitted. The spring pin is electrically connected to the high-voltage component inside the static eliminator rod.

4. The electrode assembly for an electrostatic eliminator according to claim 3, characterized in that: The aforementioned boss constitutes an insertion positioning / limiting structure between the spring insert and the tubular discharge electrode, and between the tubular discharge electrode and the discharge electrode seat.

5. The electrode assembly for an electrostatic eliminator according to claim 1, characterized in that: The wall thickness range of the tubular discharge electrode is: 0.01mm≤h 壁厚 ≤1mm; The outer diameter range of the tubular discharge electrode is: 1mm≤d 外径 ≤10mm。 6. The electrode assembly for an electrostatic eliminator according to claim 1, characterized in that: The discharge electrode assembly is fixedly mounted on the core surface structure of the DC ion bar.

7. The electrode assembly for an electrostatic eliminator according to claim 1, characterized in that: The electrode assembly used in the static eliminator adopts a tubular discharge electrode structure, which increases the discharge area at the tip of the electrode needle. While taking into account the discharge electric field strength and ion release capability of the discharge electrode, it reduces the tangential electric field strength on the surface of the DC ion rod, reduces charge migration on the surface of the rod, effectively suppresses surface flashover between two adjacent positive and negative discharge electrodes, and thus enhances the insulation performance of the surface of the DC ion rod.

8. A method for optimizing the electrode assembly for an electrostatic eliminator as described in claim 1, characterized in that at least Includes the following steps: 1) Construct simulation structural models of needle-type and tubular discharge electrode assemblies; 2) Apply the electrostatic field mathematical model to the entire simulation space respectively; 3) Mesh the simulation domain for the needle-type discharge electrode assembly and perform simulation calculations; 4) Obtain the tangential electric field intensity on the surface of the rod where the discharge electrode of the needle discharge electrode assembly is located and the electric field intensity at the tip of the discharge electrode; 5) Use the outer diameter and wall thickness of the tubular discharge electrode as optimization variables, and set upper and lower limits for the optimization variables respectively; 6) Use the tangential electric field intensity on the surface of the rod containing the needle-type discharge electrode assembly and the tubular discharge electrode, as well as the electric field intensity at the tip of the discharge electrode, as evaluation technical parameters, and use these evaluation technical parameters to set the optimization objective function; 7) The Nelder-Mead method is used to optimize and solve the above objective function; 8) Mesh the simulation domain for the tubular discharge electrode, perform simulation calculations, and obtain the optimal parameter values ​​for the outer diameter and wall thickness of the tubular discharge electrode, as well as the corresponding tangential electric field strength on the surface of the rod where the discharge electrode is located and the electric field strength at the tip of the discharge electrode. 9) Compare and analyze the technical characteristics of the tangential electric field strength on the surface of the rod and the electric field strength at the tip of the electrode when comparing the needle-type discharge electrode assembly and the tubular discharge electrode, and determine the technical effect of using the tubular discharge electrode.

9. The method for optimizing an electrode assembly for an electrostatic eliminator according to claim 8, characterized in that... In step 1), the simulation structural models of the needle-type discharge electrode assembly and the tubular discharge electrode assembly adopt the same positive and negative electrode spacing and the same rod surface structure. When constructing the simulation structural model, only the surface structure of the rod between a pair of positive and negative electrodes was constructed; In step 2), the mathematical model of the electrostatic field is: Where V is the electrode voltage, in units of V; ε0 is the vacuum permittivity, ε0 ​​= 8.854187817 × 10⁻⁶. -12 F / m, unit F / m; ε r is the relative permittivity of the material, which is dimensionless; the positive and negative electrode voltages are set to +20kV and -20kV, respectively. The formula for calculating the minimum value of the objective function is as follows: In the above formula: E AVG放电尖端:圆管 E represents the average electric field strength (in V / m) at the surface of the discharge tip of the tubular discharge electrode. AVG Discharge tip: The cone-shaped discharge electrode has an average electric field intensity (unit: V / m) on its surface at the discharge tip. tx:圆管 |) represents the maximum absolute value (unit: V / m) of the tangential electric field intensity on the surface of the rod containing the tubular discharge electrode. tx:圆锥 ) represents the maximum absolute value of the tangential electric field intensity on the surface of the rod where the needle-type discharge electrode is located (unit: V / m), d 外径 h is the outer diameter of the tubular discharge electrode (unit: mm). 壁厚 The wall thickness of the tubular discharge electrode (unit: mm).

10. The method for optimizing an electrode assembly for an electrostatic eliminator according to claim 8, characterized in that: The optimization method employs tubular electrode assemblies to reduce the tangential electric field intensity on the surface of the DC ion rod, thereby reducing the migration of surface charge and effectively suppressing surface flashover between the positive and negative discharge electrodes. This enhances the insulation performance of the DC ion rod surface while also considering its discharge performance, ensuring the ion rod's charge dissipation capability.

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