Electrode needle structure for static eliminator and verification method thereof

Abstract

The invention discloses an electrode needle structure for a static eliminator and a verification method thereof, and belongs to the field of static elimination. A round bar-shaped structure is arranged at the front end of the needle body of the electrode needle; the bottom end of the round bar-shaped structure and the front end of the electrode needle body are connected into a whole through an axial symmetry structure defined by an arc-shaped curved surface or a linear curved surface. And a hemispherical segment structure with the diameter the same as that of the round bar-shaped structure is arranged at the top of the round bar-shaped structure. A round-rod-shaped tip design is adopted, the uniformity of electric field distribution of the tip of an existing spherical segment electrode needle is considered, the structure of the tip after electric corrosion and abrasion is consistent with a round-rod-shaped structure, and then it is guaranteed that the field intensity value of the top of the tip is basically kept to be a constant value within the designed service life; the structure of the tip after electric corrosion and abrasion is consistent with that of a round bar-shaped structure, and the field intensity value of the top of the tip is basically kept as a constant value, so that more stable discharge and ion output within the designed service life are realized. The electrode needle can be widely applied to the field of design and manufacturing of the electrode needle for the electrostatic eliminator.

Description

Technical Field

[0001] The invention belongs to the field of static elimination, and in particular relates to an electrode needle structure used in a static eliminator. Background Art

[0002] The discharge electrode of an electrostatic eliminator (also known as an ion eliminator, such as an ion blower, ion rod, ion nozzle, etc.) is an important device used to achieve tip corona discharge and output positive and negative ions to the outside. Most of them are needle-shaped structures.

[0003] The structure of the electrode needle has a decisive influence on the electric field distribution on it. It is the structural basis for achieving stable discharge and an important guarantee for achieving long-term and stable discharge performance of the discharge device.

[0004] There are two types of existing electrostatic eliminator electrode needle structures: one is an electrode needle with a flat top surface (truncated cone electrode needle), the specific structure of which is shown in Figure 1 One is an electrode needle with a spherical cap at the top surface of the tip (spherical segment electrode needle), and its specific structure is shown in Figure 2 shown.

[0005] The above technical solution has the following technical defects:

[0006] The electric field intensity distribution on the top surface of the existing truncated cone electrode needle tip is extremely uneven. The electric field intensity is extremely high at the edge, while the electric field intensity on the center plane surrounded by it is much smaller than that at its edge. Therefore, the electro-corrosion wear at the tip of the electrode needle will show significant differences over time (see Figure 3 The edge will gradually become blunt, causing a change in the tip structure. This structural change will gradually reduce the originally high electric field strength at the edge, thereby significantly reducing the amount of ion generation and reducing the deionization ability.

[0007] The existing spherical electrode needle has improved the electric field distribution at the tip to a certain extent, making the electric field intensity more uniform and the discharge more stable. However, as the use time increases, the tip structure will inevitably become blunt due to electrocorrosion wear (see Figure 4 The electric field strength becomes weaker, which in turn reduces the amount of ions generated and the de-static performance.

[0008] Based on the above reasons, it is necessary to improve the electrode needle structure of the existing static eliminator to provide an important structural guarantee for the stable static elimination capability. Summary of the invention

[0009] The technical problem to be solved by the present invention is to provide an electrode needle structure for an electric dissipator and a verification method thereof. The electrode needle structure can not only take into account the uniform distribution of the electric field at the tip of the electrode needle, but also ensure that the structure after electrocorrosion wear is always consistent with the original electrode needle tip structure to ensure the stability of the electric field strength value; therefore, maintaining the stability of the above two within the design life of the electrode needle can provide an important structural guarantee for the stable electric dissipation capability.

[0010] The technical solution of the present invention is to provide an electrode needle structure for an electric discharger, comprising an electrode needle body, characterized in that:

[0011] A round rod-shaped structure is arranged at the front end of the electrode needle body;

[0012] The bottom end of the round rod-shaped structure and the front end of the electrode needle body are connected as a whole through an axially symmetrical structure surrounded by an arc-shaped curved surface or a straight curved surface;

[0013] A hemispherical segment structure having a diameter the same as that of the round rod-shaped structure is arranged on the top of the round rod-shaped structure.

[0014] Specifically, the diameter of the round rod-shaped structure is smaller than the diameter of the electrode needle body.

[0015] Specifically, the axially symmetrical structure surrounded by the arc surface is a hemispherical segment structure; the diameter of the hemispherical segment structure is the same as the diameter of the electrode needle body; the bottom end of the round rod-shaped structure and the front end of the electrode needle body are connected as a whole through the hemispherical segment structure.

[0016] Specifically, the axially symmetrical structure surrounded by the straight curved surface is a truncated cone structure; the bottom diameter of the truncated cone is the same as the diameter of the electrode needle body; the top diameter of the truncated cone is the same as the diameter of the round rod-shaped structure; the bottom end of the round rod-shaped structure and the front end of the electrode needle body are connected as a whole through the truncated cone structure.

[0017] Furthermore, the bottom surface of the truncated cone is one end of a larger circular surface; and the top surface of the truncated cone is one end of a smaller circular surface.

[0018] Specifically, the electrode needle, the round rod-shaped structure and the axisymmetric structure are made of metal materials and / or semiconductor materials.

[0019] Furthermore, the electrode needle structure used for the electrical discharge device adopts a round rod-shaped corona discharge structure, and the electric field distribution at the tip is relatively uniform; at the same time, the tip is also corroded and worn due to its own structure, and the final structure after corrosion and wear is the same as the original round rod-shaped structure, ensuring that the field strength value at the discharge position remains basically unchanged, thereby achieving stable and unchanged discharge and ion output.

[0020] The electrode needle structure for the eliminator described in the present invention adopts a spherical segment and a rod-shaped tip structure, so that its electric field distribution is more uniform, more ions can be ionized on the basis of forming a stable discharge, the eliminator's anti-static performance is improved, and it is beneficial to achieve that the structure after electro-corrosion wear is always consistent with the original rod-shaped electrode needle tip structure, thereby ensuring the stability of the electric field strength value before and after electro-corrosion.

[0021] The electrode needle structure for the discharge device described in the present invention adopts a round rod-shaped tip design, taking into account the uniformity of the electric field distribution at the tip of the existing spherical segment electrode needle, so that the structure of the tip after electro-corrosion wear is consistent with the round rod-shaped structure, thereby ensuring that the field strength value at the top of the tip is basically maintained at a constant value within the design life; the structure of the tip after electro-corrosion wear is consistent with the round rod-shaped structure, and the field strength value at the top of the tip is basically maintained at a constant value, thereby achieving more stable discharge and ion output within the design life.

[0022] The technical solution of the present invention also provides a verification method for the electrode needle structure for the dissipator, comprising constructing an electrode needle structure for the dissipator, which is characterized by comprising the following steps:

[0023] 1) Constrain the size of electrode needles of different structural forms to facilitate scientific and reasonable simulation calculation and comparison;

[0024] 2) The installation distance between the ion rod electrode needle and the surface of the de-electrified object is used as the distance between the electrode needle tip and the ground electrode in the simulation test, and a simulation domain is constructed;

[0025] 3) Establishing an electric field model of the above simulation area according to electrostatic field theory;

[0026] 4) Set the boundary conditions of the simulation area;

[0027] 5) Divide the boundary grids of electrode needles of different structural forms into uniform fixed unit numbers;

[0028] 6) Perform simulation calculations to obtain the electric field intensity distribution of electrode needles with different structural forms;

[0029] 7) Compare the electric field intensity distribution curves of the tip of the electrode needles of different structural forms with the corresponding electrode needle tip structure curves (outer contour lines), and select the one that is closest or has the highest overlap between the two as the final selected electrode needle structure;

[0030] Wherein, the electrode needle tip structure curve is the outer contour line of the electrode needle tip structure;

[0031] 8) By verifying the structure of the electrode needle used for the eliminator, the electric field distribution of the electrode needle is made more uniform. On the basis of forming a stable discharge, more ions can be ionized, thereby improving the eliminator's dissipation performance. This is conducive to achieving the consistency between the structure after electro-corrosion wear and the original rod-shaped electrode needle tip structure, thereby ensuring the stability of the electric field strength value before and after electro-corrosion.

[0032] Compared with the prior art, the advantages of the present invention are:

[0033] 1. The technical solution of the present invention adopts a round rod-shaped tip design, which takes into account the uniformity of the electric field distribution at the tip of the existing spherical electrode needle;

[0034] 2. The electrode needle of the present invention adopts a round rod-shaped tip design, so that the structure of the tip after electro-corrosion and wear is consistent with the round rod structure;

[0035] 3. Due to the round rod-shaped tip design, the structure of the electrode needle tip after electro-corrosion wear is consistent with the round rod-shaped structure, so that the field strength value at the top of the tip is basically maintained at a constant value within the design life;

[0036] 4. The technical solution of the present invention adopts a round rod-shaped tip design, and the structure of the tip after electro-corrosion wear is consistent with the round rod-shaped structure, and the field strength value at the top of the tip is basically maintained at a constant value, thereby achieving more stable discharge and ion output within the design life;

[0037] 5. By verifying the structure of the electrode needle used for the eliminator, the electric field distribution of the electrode needle is made more uniform. On the basis of forming a stable discharge, more ions can be ionized, which improves the eliminator's dissipation performance. It is beneficial to achieve that the structure after electro-corrosion wear is always consistent with the original rod-shaped electrode needle tip structure, ensuring the stability of the electric field strength value before and after electro-corrosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the structure of a truncated cone electrode needle;

[0039] Figure 2 It is a schematic diagram of the structure of the ball-slot electrode needle;

[0040] Figure 3 Schematic diagram of the electro-corrosion wear of the truncated cone electrode needle;

[0041] Figure 4 Schematic diagram of the electro-corrosion wear of the ball-segment electrode needle;

[0042] Figure 5a It is a schematic diagram of the structure of the round rod electrode needle of the present invention;

[0043] Figure 5b This is an enlarged view of the top structure of the tip of the round rod electrode needle of the present invention;

[0044] Figure 6 Schematic diagram of the electro-corrosion wear of the round rod electrode needle of the present invention;

[0045] Figure 7a It is a structural schematic diagram of another round rod electrode needle of the present invention;

[0046] Figure 7b This is an enlarged view of the top structure of the tip of another round rod electrode needle of the present invention;

[0047] Figure 8 It is a flowchart of the electrode needle structure simulation test comparison method of the present invention;

[0048] Fig. 9 It is a schematic diagram of the dimensions of a round rod electrode needle embodiment of the present invention;

[0049] Fig.10 A schematic diagram of the dimensions of another round rod electrode needle embodiment of the present invention;

[0050] Fig.11 This is a schematic diagram of the dimensions of the truncated cone electrode needle;

[0051] Fig.12 This is a schematic diagram of the size of the ball-slot electrode needle;

[0052] Fig.13 It is a schematic cross-sectional diagram of a simulation domain in the verification method of the present invention;

[0053] Fig.14a This is the electric field intensity distribution diagram of the round rod electrode needle of the present invention;

[0054] Fig.14b The electric field intensity distribution diagram of the tip of the round rod electrode needle of the present invention;

[0055] Fig.15a This is a diagram showing the electric field intensity distribution of another round rod electrode needle of the present invention;

[0056] Fig.15b This is a diagram showing the electric field intensity distribution at the tip of another round rod electrode needle of the present invention;

[0057] Fig.16a This is the electric field intensity distribution diagram of the spherical electrode needle;

[0058] Fig.16b This is the electric field intensity distribution diagram at the tip of the spherical electrode needle;

[0059] Fig.17a This is the electric field intensity distribution diagram of the truncated cone electrode needle;

[0060] Fig.17b This is the electric field intensity distribution diagram at the tip of the truncated cone electrode needle;

[0061] Fig.18Schematic diagram of the comparison of surface field intensity at the tip of electrode needles with different structures (axisymmetric);

[0062] Fig.19 is the standard deviation of the field intensity distribution on the tip surface of the electrode needle with different structures;

[0063] Fig.20a The electric field intensity distribution curves of the tip of the electrode needle with different structures (axis symmetry);

[0064] Fig.20b It is a partial enlarged diagram of the electric field intensity distribution curve at the tip of the electrode needle with different structural forms (axis symmetric);

[0065] In the figure: A is the electro-corrosion wear part, 1, 1' are the electrode needle body, 2 is the hemispherical notch boss, 2' is the electrode needle cone, 3, 3' are the electrode needle tip, 3-1, 3'-1 are the top of the electrode needle tip (the main location where corona discharge occurs). DETAILED DESCRIPTION

[0066] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0067] The technical solution of the present invention provides an electrode needle structure for an electric discharger, and the technical solution is as follows:

[0068] A round rod-shaped structure is arranged at the tip of the electrode needle, and the top of the structure is a hemispherical segment with the same diameter as that of the round rod-shaped structure (Note: the segment is the part of a sphere cut off by a plane. The circular surface obtained by cutting the sphere by a plane is called the base of the segment; the curved part of the surface of the segment is the spherical cap).

[0069] The diameter of the round rod-shaped structure is smaller than the diameter of the electrode needle body.

[0070] The round rod-shaped structure can be electrically connected to the electrode needle body as a whole through an axially symmetrical structure surrounded by an arc-shaped curved surface.

[0071] The axisymmetric structure surrounded by the arc-shaped surface may be a hemispherical segment, that is, the bottom of the round rod-shaped structure and a hemispherical segment with the same diameter as the electrode needle body are electrically connected as a whole.

[0072] The hemispherical segment having the same diameter as the electrode needle body is integrally arranged with the electrode needle body.

[0073] In addition, the round rod-shaped structure can also be electrically connected to the electrode needle body through a truncated cone.

[0074] The diameter of the bottom surface (the end with the larger circular surface) of the above-mentioned truncated cone is the same as the diameter of the electrode needle body.

[0075] The diameter of the top surface (the end with the smaller circular surface) of the above-mentioned truncated cone is the same as the diameter of the round rod-shaped structure.

[0076] The electrode needles may be made of metal material and / or semiconductor material.

[0077] For details, see Figure 5a , 5b As shown in the technical solution of the present invention, a round rod-shaped structure 3 is arranged at the front end (also called the tip) of the electrode needle body 1, and the top 3-1 of the round rod-shaped structure (the main location where corona discharge occurs) is hemispherical, and the diameter of the hemisphere is the same as the diameter of the round rod-shaped structure.

[0078] Furthermore, the diameter of the round rod-shaped structure 3 is smaller than the diameter of the electrode needle body 1 , and the bottom of the round rod-shaped structure 3 is formed as a whole with the needle body 1 through a semi-spherical segment 2 .

[0079] The diameter of the hemispherical segment 2 is the same as that of the needle body 1 .

[0080] like Figure 6 As shown in the figure, because the technical solution adopts a round rod-shaped corona discharge structure, the electric field distribution at the tip is relatively uniform; at the same time, the tip is also corroded and worn due to its own structure, and the final structure after corrosion and wear is the same as the original round rod-shaped structure, thus ensuring that the field strength value at the discharge position remains basically unchanged, thereby achieving stable and unchanged discharge and ion output.

[0081] Figure 7a , 7b As shown in the figure, it is another round rod-shaped tip electrode needle structure of the present technical solution, Figure 5a The difference is that the round rod-shaped structure 3' is formed as one piece with the needle body 1' through the needle cone 2'.

[0082] In order to verify the superiority of the electrode needle structure in this technical solution, refer to Figure 8 In the steps shown, simulation comparison tests were conducted on the above four electrode needle structures:

[0083] 1. In order to increase the scientificity and rationality of the comparison, the structural dimensions of the four types of electrode needles are restricted:

[0084] The total length of the four electrode needles is set to 6mm, the needle body diameter is set to 1mm, the tip diameter is set to 0.15mm, and the needle cone angle is set to 15°; the length of the tip of the round rod electrode needle (round rod structure) is set to 2mm. The specific mechanical structure size diagram is shown in Figures 9 to 12 As shown;

[0085] 2. The distance between the electrode tip and the ground electrode in the simulation test is set based on the installation distance of 35 mm between the electrode needle of the ion rod and the surface of the object to be de-charged (the lower installation distance in industry applications);

[0086] 3. Set a cylindrical simulation area containing the electrode needle. The height of the cylinder is the total length of the electrode needle plus the installation distance, that is, 35mm+6mm=41mm; the diameter of the cylinder is set to 60mm, see Fig.13 As shown;

[0087] 4. Establish the electric field model of the above simulation area according to electrostatic field theory;

[0088] 5. Set boundary conditions: set the high voltage value of the electrode needle boundary, such as 5000V; set the ground electrode voltage value to 0V; set other boundaries to zero charge boundaries;

[0089] 6. Because the size of the electrode needle structure is quite different from the size of the simulation domain, in order to avoid large calculation errors and to accurately compare electrode needles with different structures, the grid is set as follows:

[0090] The boundary grids of the four types of electrode needles are divided into uniform fixed units, and the unit value size is:

[0091]

[0092] In this way, the influence of the difference in mesh division caused by the different boundaries of electrode needles with different structures on the calculation results can be avoided to the greatest extent;

[0093] 7. The final simulation results of the electrode needle field strength distribution are shown in Figures 14a to 17b As shown in:

[0094] It can be seen from the figure that the field strength at the tip of the electrode needle is relatively large, and the field strength of the frustum electrode needle is further concentrated at the edge of the tip (see Fig.17b ).

[0095] 8. Further, from Fig.18 , Fig.19 , Fig.20a and Fig.20b As shown in , the electric field distribution characteristics of the tip surface of the electrode needles with different structures are as follows:

[0096] The spherical and rod-shaped tip structures make the electric field distribution more uniform, and the rod-shaped tip can obtain a higher electric field strength than the spherical tip at the same voltage; it can be seen that the rod-shaped electrode needle can ionize more ions on the basis of forming a stable discharge, thereby improving the dissipation performance of the dissipator. The field intensity distribution curve at the rod-shaped tip is the closest to the rod-shaped structure curve (outer contour line) (with the highest overlap), so it will be very helpful to achieve the consistency of the structure after electro-corrosion wear with the original rod-shaped electrode needle tip structure, ensuring the stability of the electric field strength value before and after electro-corrosion.

[0097] The technical solution of the present invention adopts a round rod-shaped tip design, taking into account the uniformity of the electric field distribution at the tip of the existing spherical segment electrode needle, so that the structure of the tip after electro-corrosion wear is consistent with the round rod-shaped structure, thereby ensuring that the field strength value at the top of the tip remains basically constant within the design life; the structure of the tip after electro-corrosion wear is consistent with the round rod-shaped structure, and the field strength value at the top of the tip remains basically constant, thereby achieving more stable discharge and ion output within the design life.

[0098] The invention can be widely used in the field of designing and manufacturing electrode needles for static eliminators.

Claims

1. An electrode needle structure for an electric discharger, comprising an electrode needle body, characterized in that: A round rod-shaped structure is arranged at the front end of the electrode needle body; The bottom end of the round rod-shaped structure and the front end of the electrode needle body are connected as a whole through an axially symmetrical structure surrounded by an arc-shaped curved surface or a straight curved surface; A hemispherical segment structure having a diameter the same as that of the round rod-shaped structure is arranged on the top of the round rod-shaped structure.

2. The electrode needle structure for a dissipator according to claim 1, characterized in that The diameter of the round rod-shaped structure is smaller than the diameter of the electrode needle body.

3. The electrode needle structure for a dissipator according to claim 1, characterized in that The axisymmetric structure surrounded by the arc-shaped surface is a hemispherical segment structure; The diameter of the hemispherical segment structure is the same as the diameter of the electrode needle body; The bottom end of the round rod-shaped structure and the front end of the electrode needle body are connected as a whole through the hemispherical segment structure.

4. The electrode needle structure for a dissipator according to claim 1, characterized in that The axisymmetric structure surrounded by the straight curved surface is a truncated cone structure; The bottom diameter of the truncated cone is the same as the diameter of the electrode needle body; The top surface diameter of the truncated cone is the same as the diameter of the round rod-shaped structure; The bottom end of the round rod-shaped structure and the front end of the electrode needle body are connected as a whole through the truncated cone structure.

5. The electrode needle structure for a dissipator according to claim 4, characterized in that The bottom surface of the truncated cone is one end of a larger circular surface; the top surface of the truncated cone is one end of a smaller circular surface.

6. The electrode needle structure for a dissipator according to claim 1, characterized in that The electrode needle, the round rod-shaped structure and the axisymmetric structure are made of metal materials and / or semiconductor materials.

7. The electrode needle structure for a dissipator according to claim 1, characterized in that The electrode needle structure used for the electrical discharge device adopts a round rod-shaped corona discharge structure, and the electric field distribution at the tip is relatively uniform; at the same time, the tip is also corroded and worn due to its own structure, and the final structure after corrosion and wear is the same as the original round rod-shaped structure, ensuring that the field strength value at the discharge position remains basically unchanged, thereby achieving stable and unchanged discharge and ion output.

8. The electrode needle structure for a dissipator according to claim 1, characterized in that The electrode needle structure used for the eliminator adopts a spherical segment and a rod-shaped tip structure, which makes its electric field distribution more uniform, can ionize more ions on the basis of forming a stable discharge, improves the eliminator's dissipation performance, and is conducive to achieving that the structure after electro-corrosion wear is always consistent with the original rod-shaped electrode needle tip structure, thereby ensuring the stability of the electric field strength value before and after electro-corrosion.

9. The electrode needle structure for a dissipator according to claim 1, characterized in that The electrode needle structure used for the electric discharge device adopts a round rod-shaped tip design, taking into account the uniformity of the electric field distribution at the tip of the existing spherical segment electrode needle, so that the structure of the tip after electro-corrosion wear is consistent with the round rod-shaped structure, thereby ensuring that the field strength value at the top of the tip is basically maintained at a constant value within the design life; The structure of the tip after electro-corrosion wear is consistent with the round rod structure, and the field strength value at the top of the tip is basically maintained at a constant value, thereby achieving more stable discharge and ion output within the design life.

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