Electrode assembly for electrostatic eliminator

Abstract

An electrode assembly for a static electricity eliminator 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] The utility model belongs to the field of static elimination, and in particular relates to an electrode assembly for a static eliminator. Background Art

[0002] Ion rods are the most commonly used type of static eliminator and are widely used in the field of static control in industrial production processes. DC ion rods are used in places with high static electricity generation due to their high ion generation efficiency, long range, and strong static elimination capabilities.

[0003] However, due to the working characteristics of the DC ion rod (referred to as the ion rod) itself and to meet the requirements of high static elimination capabilities, its working voltage is relatively high (the voltage applied to the discharge electrode is relatively high), and multiple positive and negative discharge electrodes are arranged with positive and negative intervals (that is, each positive discharge electrode is adjacent to each negative discharge electrode). It is very easy for the positive and negative discharge electrodes to flash over (surface insulation breakdown) on the surface of the DC ion rod body (referred to as the rod body surface) between them, thereby causing damage to the ion rod.

[0004] The discharge electrode assembly (also known as the electrode needle assembly) is a critical electrical component of a DC ion rod. Due to discharge requirements, the high voltage applied to the discharge electrode must be exposed. This creates a tangential electric field on the rod surface between the positive and negative discharge electrodes, a key factor in the aforementioned surface flashover. Due to limitations in the extrusion process, optimizing the surface insulation structure of the rod core (body) presents significant limitations. However, the discharge electrode assembly utilizes machining and injection molding, leaving ample room for optimization.

[0005] Existing discharge electrode assembly structures can be broadly divided into two categories: the first, represented by the invention patent "An Electrode Assembly for an Electrostatic Eliminator," published on March 2, 2016, with the publication number CN 103716975 B. In this technical solution, the electrode assembly described in this patent has electrodes and / or metal parts that do not directly contact the core (body) or surface (referred to as the rod surface) of the DC ion rod. The second, represented by the utility model patent "An Electrode Needle Assembly for an Electrostatic Eliminator," published on August 25, 2023, with the publication number CN 219592680 U, has electrodes and / or metal parts that do directly contact the core (body) or surface (referred to as the rod surface) of the DC ion rod. Both of these discharge electrode assembly structures utilize an electrode needle structure with a pointed conical front end (also known as the tip) and a small radial diameter. The mechanical parameters of this type of electrode needle are generally as follows:

[0006] 1) Electrode diameter: usually 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 the electrode needle structure with a pointed conical front end and a small diameter is adopted, and the voltage applied to the electrode needle by the DC ion rod is relatively high, the surface tangential electric field it generates is relatively large, which can easily cause the migration of charges on the surface of the DC ion rod body, and then surface flashover between the positive and negative discharge electrodes occurs, causing surface insulation breakdown and a decrease in the dissipation performance.

[0011] If the electrode needles and / or metal fixings of the electrode assembly are in direct contact with the core (body) or the surface of the DC ion rod, the surface tangential electric field generated will become larger, which will more easily cause the migration of charges on the surface of the rod, triggering strong surface flashover between the positive and negative discharge electrodes, causing surface insulation breakdown, degradation of dissipation performance, or even loss of dissipation ability.

[0012] Because the aforementioned cylindrical (also called stick-shaped or rod-shaped) electrode needle structure with a pointed conical front end and a small radial diameter is adopted, and the DC ion rod applies a higher voltage to the electrode needle, the electrode needle suffers greater and faster electrical erosion loss, which in turn leads to a faster decline in ion release performance, resulting in a shorter duration of the DC ion rod's de-electrical performance.

[0013] Therefore, how to optimize the design of the discharge electrode assembly structure to reduce the tangential electric field on the surface of the DC ion rod, suppress the surface flashover between the positive and negative discharge electrodes, and improve the surface insulation performance of the DC ion rod is an important research direction. Utility Model Content

[0014] The technical problem to be solved by the present invention is to provide an electrode assembly for an electrostatic eliminator. The electrode assembly adopts a tubular discharge electrode structure, which greatly increases the discharge area of ​​the discharge electrode front end (also known as the tip). The structure of the discharge electrode before and after electro-corrosion wear remains essentially unchanged, and the discharge performance of the discharge electrode front end remains essentially unchanged, and the static elimination performance is also effectively maintained. Taking into account the discharge field strength of the discharge electrode (i.e., the static elimination performance of the ion rod), the discharge electrode assembly structure is optimized and the tubular discharge electrode structure is adopted. This significantly reduces the tangential electric field strength on the surface of the DC ion rod, reduces the migration of charge on the rod surface, and can effectively suppress the 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 utility model is to provide an electrode assembly for a static eliminator, comprising a discharge electrode holder and a discharge electrode, which is characterized by:

[0016] A tubular discharge electrode and a spring insert are provided;

[0017] The spring plug-in is a rod-shaped structural member;

[0018] The front end of the spring plug-in rod-shaped structural member is inserted into the tubular discharge electrode;

[0019] The rear end of the spring plug-in is electrically connected to the high-voltage component in the static eliminator rod;

[0020] The tubular discharge electrode and the spring plug-in are arranged through the discharge electrode seat;

[0021] The tubular discharge electrode, the spring plug-in unit and the discharge electrode seat constitute a discharge electrode assembly as a whole.

[0022] Specifically, the tubular discharge electrode and the spring plug-in are arranged through the axial center position of the discharge electrode seat.

[0023] Specifically, a boss is provided at the middle and rear part of the spring plug-in unit, dividing the rod-shaped structural member into a column in the front half and a spring ejector in the rear half.

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

[0025] Furthermore, the column is inserted into the rear end of the tubular discharge electrode, and the two are interference fit.

[0026] Furthermore, the spring ejector is electrically connected to the high-voltage component in the static eliminator rod.

[0027] Specifically, the wall thickness of the tubular discharge electrode ranges from:

[0028] 0.01mm≤h 壁厚 ≤1mm.

[0029] Specifically, the outer diameter of the tubular discharge electrode has a numerical range of:

[0030] 1mm≤d 外径 ≤10mm.

[0031] Specifically, the discharge electrode assembly is fixedly mounted on the rod core surface structure of the DC ion rod.

[0032] The electrode assembly for the static eliminator described in the technical solution of the utility model adopts a tubular discharge electrode structure to increase the discharge area of ​​the electrode needle tip. On the basis of taking into account the discharge electric field strength and ion release capacity of the discharge electrode, the tangential electric field strength on the surface of the DC ion rod is reduced, the charge migration on the surface of the rod is reduced, the surface flashover between two adjacent positive and negative discharge electrodes is suppressed, and the insulation performance of the surface of the DC ion rod is enhanced.

[0033] Compared with the prior art, the advantages of the present invention are:

[0034] 1. The technical solution of this utility model adopts a tubular discharge electrode structure with a larger diameter front end (also known as the top) compared to a pointed conical electrode needle structure. This effectively reduces the tangential electric field intensity on the surface of the ion rod, reduces the migration of charge on the rod surface, 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.

[0035] 2. The technical solution of this utility model adopts a tubular discharge electrode structure with a thin wall thickness and a large diameter, which greatly increases the discharge area at its front end. Therefore, it takes into account the discharge performance and ion output of the original conical electrode needle structure with a small diameter. On the basis of taking into account the discharge field intensity and ion release capacity (corresponding to the de-staticization capacity) of the discharge electrode, the de-staticization performance of the DC ion rod is effectively taken into account.

[0036] 3. Compared with the electrode needle structure with a pointed cone shape and a smaller diameter, after the electro-corrosion wear, the needle tip gradually becomes blunt, the discharge performance decreases, and the anti-static performance weakens; the electrode assembly using the tubular discharge electrode described in the present technical solution adopts a tubular discharge electrode structure with a smaller wall thickness and a larger diameter, which increases the discharge area of ​​the front end of the electrode needle. Therefore, even after long-term use, its structure before and after electro-corrosion wear remains basically unchanged, the discharge performance remains basically unchanged, and the overall anti-static performance of the ion rod is also effectively maintained. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is the front view of the discharge electrode assembly of the present invention;

[0038] Figure 2 for Figure 1 AA section view;

[0039] Figure 3 This is a three-dimensional view of the discharge electrode assembly of the present invention from a bottom-up perspective;

[0040] Figure 4 This is a three-dimensional view of the discharge electrode assembly of the present invention from a top-down perspective;

[0041] Figure 5This is an exploded axial view of the discharge electrode assembly of the present invention;

[0042] Figure 6 This is a schematic diagram of the surface simulation structure of the discharge electrode assembly rod in the prior art;

[0043] Figure 7 This is a schematic diagram of the surface simulation structure of the discharge electrode assembly rod of the utility model;

[0044] Figure 8 This is a schematic diagram of the tangential electric field distribution on the surface of the discharge electrode assembly rod in the prior art;

[0045] Figure 9 This is a schematic diagram of the tangential electric field distribution on the rod surface of the discharge electrode assembly of the utility model;

[0046] Figure 10-1 Schematic diagram of the discharge electrode connection line (X-direction center line) on the rod surface of the existing discharge electrode assembly;

[0047] Figure 10-2 This is a schematic diagram of the discharge electrode connection line (X-direction center line) on the rod surface of the discharge electrode assembly of the utility model;

[0048] Figure 10-3 Schematic diagram of the tangential electric field distribution of the discharge electrode connection line (X-direction center line) on the surface of the discharge electrode assembly rod of the prior art and the utility model;

[0049] Figure 11 A schematic diagram of the discharge tip surface of a discharge electrode assembly in the prior art;

[0050] Figure 12 This is a schematic diagram of the discharge tip surface of the discharge electrode assembly of the utility model.

[0051] In the figure: 1 is a spring plug, 1-a is one end of the spring thimble of the spring plug, 1-b is one end of the cylinder of the spring plug, 1-c is a boss, 2 is a tubular discharge electrode, 2' is a conical discharge electrode, 3 is a discharge electrode seat, 3' is an existing discharge electrode seat, 4 is a DC rod core surface structure, 4' is a DC rod core surface structure of the prior art, and 5 is a high-voltage component. DETAILED DESCRIPTION

[0052] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0053] The technical solution of the present invention, on the basis of taking into account the discharge electric field strength of the discharge electrode (i.e. taking into account the static dissipation performance of the ion rod), optimizes the discharge electrode assembly structure to significantly reduce the tangential electric field strength on the surface of the DC ion rod, reduce the migration of charges on the surface of the rod, effectively suppress the surface flashover between two adjacent positive and negative discharge electrodes, and thus enhance the surface insulation performance of the DC ion rod.

[0054] In order to achieve the above-mentioned utility model purpose, the following technical solutions are implemented:

[0055] like Figures 1 to 5 As shown in the figure, the technical solution of the present invention is that a tubular discharge electrode 2 is arranged through the discharge electrode seat 3, and the tubular discharge electrode is inserted into one end 1-b of the cylinder of a spring plug-in 1; one end 1-a of the spring pin of the spring plug-in 1 is electrically connected to the high-voltage component 5 in the ion rod.

[0056] The spring plug-in 1 equipped with the tubular discharge electrode is inserted into the axial center of a discharge electrode seat 3 to form a discharge electrode assembly, which is installed on the rod core surface structure 4 of the DC ion rod (see Figure 7 ).

[0057] The spring plug-in has a rod body 1, in the middle of which is provided an annular boss 1-c. The entire rod body is divided by the boss into a cylindrical end 1-b of the spring plug-in and a spring ejector end 1-a of the spring plug-in.

[0058] One end 1 - b of the cylinder of the spring plug is inserted into the tubular discharge electrode 2 , and one end 1 - a of the spring pin of the spring plug is electrically connected to the high-voltage component 5 in the ion rod.

[0059] The boss 1 - c constitutes an insertion positioning / limiting structure between the spring plug 1 and the tubular discharge electrode 2 and the discharge electrode seat 3 .

[0060] In order to optimize the specific structural parameters of the tubular discharge electrode assembly of this technical solution to achieve the best discharge performance and compare it with the existing discharge electrode assembly, the following structural optimization method and simulation comparison test are designed:

[0061] Simulation models of the prior art conical-needle-shaped discharge electrode assembly and the proposed tubular discharge electrode assembly were constructed, and the electrostatic field mathematical model was applied to the entire simulation space. The simulation domain of the prior art conical-needle-shaped discharge electrode assembly was first meshed, and simulation operations were performed. The tangential electric field intensity on the rod surface where the prior art discharge electrode assembly resides and the electric field intensity at the discharge electrode tip were obtained.

[0062] The outer diameter and wall thickness of the tubular discharge electrode of this technical solution are used as optimization variables, and the upper and lower limits of the optimization variables are set respectively according to the design requirements.

[0063] The tangential electric field intensity on the rod surface where the conical-needle discharge electrode of the prior art and the tubular discharge electrode of the present technical solution are located, 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 used to set the optimization objective function so that the objective function takes the minimum value:

[0064]

[0065] The Nelder-Mead method (a derivative-free optimization algorithm, an algorithm for finding the local minimum of a multivariate function) is used to optimize and solve the above objective function.

[0066] The simulation domain of the tubular discharge electrode of this technical solution is meshed and simulation operations are performed to obtain the optimal parameter values ​​of the outer diameter and wall thickness of the tubular discharge electrode and the corresponding tangential electric field intensity on the rod surface where the tubular discharge electrode is located and the electric field intensity at the tip of the discharge electrode.

[0067] The technical characteristics of the tangential electric field intensity on the rod surface and the electric field intensity at the discharge electrode tip of the conical-needle-shaped discharge electrode assembly of the prior art and the tubular discharge electrode assembly of the present technical solution are compared and analyzed to verify the feasibility of the present technical solution.

[0068] The specific implementation process is as follows:

[0069] 1. See Figures 1 to 5 As shown in FIG, a tubular discharge electrode 2 is provided and inserted into one end of a cylindrical body 1 - b of a spring plug-in 1 , and the two achieve interference fit.

[0070] 2. One end of the spring pin 1 - a of the spring plug 1 is electrically connected to the high-voltage component 5 in the ion rod.

[0071] 3. Insert the spring plug-in unit 1 equipped with the tubular discharge electrode 2 into the axial center of a discharge electrode holder 3, thereby forming a discharge electrode assembly together with the discharge electrode holder.

[0072] 4. The discharge electrode holder 3 can be assembled on the DC rod core surface structure 4 of the DC ion rod by installing threads or snapping.

[0073] Example:

[0074] To obtain the optimal structural parameters of the discharge electrode assembly of this technical solution, so as to reduce the tangential electric field intensity on the rod surface, reduce the migration of charge on the rod surface, effectively suppress the surface flashover between the positive and negative discharge electrodes, enhance the surface insulation performance of the DC ion rod, and at the same time take into account its discharge performance; and to compare and verify the discharge electrode assembly of the existing technical solution, the following structural optimization method and simulation comparison test were specifically designed:

[0075] 1) See Figure 6 、 Figure 7 As shown, based on the discharge electrode components of the prior art and the present technical solution, a surface electric field simulation structure model between the positive and negative electrodes of the DC ion rod is constructed.

[0076] In order to make a reasonable data comparison, the above two simulation structure models use the same positive and negative electrode spacing (such as 100 mm) and the same rod surface structure (overall size).

[0077] To simplify the calculations, only the rod surface structure between a pair of positive and negative electrodes was constructed; because the positive and negative electrodes are symmetrical and regularly arranged, this simplified structure is sufficient to meet research needs.

[0078] 2) Apply the electrostatic field mathematical model to the entire simulation space:

[0079] -▽·(ε0ε r ▽V)=0

[0080] Where V is the electrode voltage, unit V; ε0 is the vacuum dielectric constant, ε0=8.854187817×10 -12 F / m, unit F / m; ε r is the relative dielectric constant of the material, dimensionless; the positive and negative electrode voltages are set to +20kV and -20kV respectively.

[0081] 3) First, mesh the simulation domain of the conical discharge electrode assembly of the prior art and perform simulation operations; obtain the tangential electric field intensity E on the surface of the rod where the discharge electrode assembly of the prior art 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].

[0082] 4) The outer diameter and wall thickness of the tubular discharge electrode of this technical solution are used as optimization variables, and the upper and lower limits of the optimization variables are set according to the design requirements (such as [2.4mm≤d 外径 ≤8mm]、[0.05mm≤h 壁厚 ≤0.3mm]).

[0083] 5) The tangential electric field intensity on the rod surface where the discharge electrode is located and the average electric field intensity at the tip of the discharge electrode of the prior art and the present technical solution are used as evaluation technical parameters, and these evaluation technical parameters are used to set the optimization objective function, and the objective function is minimized:

[0084]

[0085] In the above formula: E AVG放电尖端:圆管 is the average electric field intensity on the discharge tip surface of the tubular discharge electrode in this technical solution (unit: V / m), E AVG放电尖端:圆锥 The average electric field strength of the discharge tip of the cone-needle discharge electrode in the existing technology (unit: V / m), MAX (E tx:圆管 ) is the maximum absolute value of the tangential electric field intensity on the surface of the rod where the tubular discharge electrode of this technical solution is located (unit: V / m), MAX(E tx:圆锥 ) is the maximum absolute value of the tangential electric field intensity on the rod surface where the cone-needle discharge electrode is located in the prior art solution (unit: V / m), d 外径The outer diameter of the tubular discharge electrode in this technical solution (unit: mm), h 壁厚 The wall thickness of the tubular discharge electrode in this technical solution (unit: mm).

[0086] The setting of the above objective function, on the basis of the goal of reducing the tangential electric field intensity on the rod surface, fully takes into account the electrode discharge electric field intensity (that is, fully takes into account the static dissipation capability of the ion rod).

[0087] 6) The Nelder-Mead method is used to optimize and solve the above objective function.

[0088] The simulation domain of the tubular discharge electrode assembly of this technical solution is meshed and the simulation operation is performed to obtain the optimal parameter values ​​of the outer diameter and wall thickness of the tubular discharge electrode (d 外径 =5.078125[mm],h 壁厚 =0.05[mm]) and the corresponding tangential electric field strength E on the rod surface 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].

[0089] 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 strength on the surface of the rod where the cone-needle-shaped discharge electrode assembly of the prior art is located and the tubular discharge electrode assembly of the present technical solution, it can be seen that the tangential electric field strength on the surface of the rod where the tubular discharge electrode assembly of the present technical solution is located is significantly lower than the tangential electric field strength on the surface of the rod where the cone-needle-shaped discharge electrode assembly of the prior art is located.

[0090] 8) See Figure 11 、 Figure 12 As shown, although the average electric field intensity at the tip of the tubular discharge electrode of the present technical solution is lower than that of the discharge electrode tip of the conical-needle discharge electrode of the prior art, the surface area of ​​the discharge electrode tip of the tubular discharge electrode of the present technical solution ( Figure 12 The black area at the front end of the discharge electrode 2-1) (i.e. the discharge area is 2.2607E-6m 2 ), which is much larger than the surface area of ​​the discharge electrode tip of the prior art cone-needle discharge electrode ( Figure 11 The black area at the front end of the discharge electrode (2'-1) (i.e. the discharge area is 1.0449E-7m 2 ), which means that the ion generation area at the tip of the tubular discharge electrode becomes larger; this partially compensates for the decrease in the number of ions generated per unit discharge surface due to the decrease in discharge intensity.

[0091] In summary, the technical solution of the present invention, by adopting a tubular discharge electrode structure, reduces the tangential electric field strength on the surface of the discharge electrode rod and reduces the migration of charge on the surface of the rod on the basis of taking into account the discharge electric field strength and ion release capacity (corresponding to the de-charge capacity) of the discharge electrode. It can effectively suppress the surface flashover between the positive and negative discharge electrodes, enhance the surface insulation performance of the DC ion rod, and take into account its discharge performance.

[0092] The utility model can be widely used in the design and production fields of direct current ion rods and discharge electrode components thereof.

Claims

1. An electrode assembly for a static eliminator, comprising a discharge electrode holder and a discharge electrode, characterized in that: A tubular discharge electrode and a spring insert are provided; The spring plug-in is a rod-shaped structural member; The front end of the spring plug-in rod-shaped structural member is inserted into the tubular discharge electrode; The rear end of the spring plug-in is electrically connected to the high-voltage component in the static eliminator rod; The tubular discharge electrode and the spring plug-in are arranged through the discharge electrode seat; The tubular discharge electrode, the spring plug-in unit and the discharge electrode seat constitute a discharge electrode assembly as a whole.

2. The electrode assembly for a static eliminator according to claim 1, characterized in that The tubular discharge electrode and the spring plug-in are arranged through the axial center position of the discharge electrode seat.

3. The electrode assembly for a static eliminator according to claim 1, wherein A boss is provided at the middle and rear part of the spring plug-in unit, dividing the rod-shaped structural member into a column in the front half and a spring ejector in the rear half.

4. The electrode assembly for a static eliminator according to claim 3, characterized in that The boss constitutes an insertion positioning / limiting structure between the spring plug-in and the tubular discharge electrode, and between the tubular discharge electrode and the discharge electrode seat.

5. The electrode assembly for a static eliminator according to claim 3, characterized in that The column is inserted into the rear end of the tubular discharge electrode, and the two are interference fit.

6. The electrode assembly for a static eliminator according to claim 3, characterized in that The spring ejector is electrically connected to the high-voltage component in the static eliminator rod.

7. The electrode assembly for a static eliminator according to claim 1, wherein The wall thickness of the tubular discharge electrode has a numerical range of: 0.01mm≤h 壁厚 ≤1mm。 8. The electrode assembly for a static eliminator according to claim 1, characterized in that The numerical range of the outer diameter of the tubular discharge electrode is: 1mm≤d 外径 ≤10mm。 9. The electrode assembly for a static eliminator according to claim 1, characterized in that The discharge electrode assembly is fixedly mounted on the rod core surface structure of the DC ion rod.

10. The electrode assembly for a static eliminator according to claim 1, wherein The electrode assembly for the static eliminator adopts a tubular discharge electrode structure to increase the discharge area of ​​the electrode needle tip. On the basis of taking into account the discharge electric field strength and ion release capacity of the discharge electrode, the tangential electric field strength on the surface of the DC ion rod is reduced, the charge migration on the rod surface is reduced, the surface flashover between two adjacent positive and negative discharge electrodes is suppressed, and the insulation performance of the surface of the DC ion rod is enhanced.

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