Electrostatic dust collection device

Abstract

The utility model relates to an electrostatic dust collection device. The plurality of positive electrode plates and the plurality of negative electrode plates are alternately arranged at intervals, the positive electrode plates are communicated with a positive electrode of a high-voltage power supply, the negative electrode plates are communicated with a negative electrode of the high-voltage power supply, and at least one of the plurality of positive electrode plates and the plurality of negative electrode plates adopts an electrode plate made of a conductive material wrapped by an insulating material. The first supporting piece is used for connecting the positive electrode plates. And the second supporting piece is used for connecting each negative electrode plate. The two groups of insulating supporting plates are respectively positioned on two sides of the plurality of positive electrode plates and the plurality of negative electrode plates, each group of insulating supporting plates comprises at least one insulating supporting plate, and the first supporting piece and the second supporting piece are respectively connected with one insulating supporting plate in each group of insulating supporting plates. Therefore, when the surface of the insulating material of the supporting structure is polluted, a conduction path between the positive and negative electrode groups must pass through the insulating supporting plates on the two sides, so that the distance of a short-circuit path is greatly increased, the short-circuit leakage current can be reduced, and the influence of voltage drop caused by the leakage current on the performance is further reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electrostatic dust collection, in particular to an electrostatic dust collection device. Background Art

[0002] Electrostatic precipitators have been widely used and developed due to their advantages such as low air resistance and reusable cleaning.

[0003] The electrostatic dust collection device in the electrostatic precipitator is composed of discharge electrodes and dust collection electrodes arranged alternately and parallelly to form a strong electrostatic field to perform the dust collection function. The electrode plate is the most core component of the electrostatic dust collection device, and its material and structure determine the purification ability, cost, lifespan, by-products, reliability, safety, etc. of the precipitator.

[0004] At the beginning of the operation of the electrostatic dust collection device, there is no concern about the short circuit between the positive and negative electrodes caused by the support structure. However, when the support structure is contaminated, it may cause a short circuit between the positive and negative electrodes. The short circuit between the positive and negative electrodes will affect the performance of the electrostatic dust collection device.

[0005] Therefore, it is necessary to improve the support structure of the positive and negative electrodes of the electrostatic dust collection device to reduce the impact on the performance of the electrostatic dust collection device caused by the short circuit between the positive and negative electrodes. Summary of the Utility Model

[0006] An object of the utility model is to improve the support structure of the positive and negative electrodes of the electrostatic dust collection device to reduce the impact on the performance of the electrostatic dust collection device caused by the short circuit between the positive and negative electrodes.

[0007] The utility model provides an electrostatic dust collection device, comprising: a plurality of positive electrode plates and a plurality of negative electrode plates, the plurality of positive electrode plates and the plurality of negative electrode plates are alternately arranged at intervals respectively, the positive electrode plates are connected to the positive pole of the high-voltage power supply, the negative electrode plates are connected to the negative pole of the high-voltage power supply, at least one of the plurality of positive electrode plates and the plurality of negative electrode plates is a plate with a conductive material wrapped by an insulating material; a first support member for connecting each positive electrode plate; a second support member for connecting each negative electrode plate; two groups of insulating support plates located on both sides of the plurality of positive electrode plates and the plurality of negative electrode plates respectively, each group of insulating support plates includes at least one insulating support plate, and the first support member and the second support member are also respectively connected to one of the insulating support plates in each group of insulating support plates.

[0008] Optionally, each group of insulating support plates includes one insulating support plate.

[0009] Optionally, each group of insulating support plates includes two insulating support plates. The first support member and the second support member are respectively connected to different insulating support plates in each group of insulating support plates, and the insulating support plate connected to the positive electrode plate through the first support member and the insulating support plate connected to the negative electrode plate through the second support member are also connected through a connecting member.

[0010] Optionally, there is a certain distance between the insulating support plate and the adjacent electrode plate.

[0011] Optionally, the electrostatic dust collection device further includes: a shielding assembly for shielding at least the gap between the insulating support plate and the adjacent electrode plate to prevent the gap from directly facing the unpurified gas.

[0012] Optionally, the shielding assembly is further configured to shield at least one electrode plate that is not adjacent to the insulating support plate.

[0013] Optionally, the width of the electrode plate not shielded by the shielding assembly is greater than the width of the electrode plate shielded by the shielding assembly.

[0014] Optionally, the width of the electrode plate not shielded by the shielding assembly is the same as the width of the shielding area formed by the shielding assembly.

[0015] In the present utility model, the first support member is used to connect each positive electrode plate, and the second support member is used to connect each negative electrode plate. The first support member and the second support member are also respectively connected to one of the insulating support plates in each group of insulating support plates. Thus, when the surface of the insulating material of the support structure is contaminated, the conduction path between the positive and negative electrode groups must pass through the insulating support plates on both sides, which will greatly increase the distance of the short-circuit path, thereby reducing the short-circuit leakage current and further reducing the impact on performance caused by the voltage drop due to the leakage current. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] By describing the exemplary embodiments of the present utility model in more detail in conjunction with the drawings, the above and other objects, features, and advantages of the present utility model will become more apparent. Among them, in the exemplary embodiments of the present utility model, the same reference numerals generally represent the same components.

[0017] Figure 1 FIG. shows a schematic diagram of the support structure between electrodes in a strong electric field scheme.

[0018] Figure 2 FIG. shows a schematic structural diagram of an electrostatic dust collection device according to an embodiment of the present utility model.

[0019] Figure 3 FIG. shows a schematic configuration diagram of a shielding assembly according to an embodiment of the present utility model.

[0020] Figure 4It is a schematic configuration diagram showing the shielding component according to another embodiment of the present utility model.

[0021] Figure 5 It is a schematic configuration diagram showing the shielding component according to another embodiment of the present utility model. Detailed implementation manners

[0022] The preferred embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present utility model more thorough and complete, and to fully convey the scope of the present utility model to those skilled in the art.

[0023] A complete electrostatic precipitator needs to include two parts: a charging device and a dust collection device. The function of the charging device is to charge the fine particles in the air to make them charged. The dust collection device adsorbs the charged particles through an electrostatic field to achieve the effect of air purification. This disclosure only relates to the improvement of the dust collection device and does not relate to the improvement of the charging device. Therefore, this disclosure does not describe the charging device and focuses on describing the dust collection device. It should be known that the dust collection device (i.e., the electrostatic dust collection device) described in this disclosure can be used in cooperation with the charging device to form a complete electrostatic precipitator. Or rather, the electrostatic dust collection device described in this disclosure can also include a charging device to form a complete electrostatic precipitator. In addition, some of the test cases mentioned in the text are by default the test results in cooperation with the charging device.

[0024] In the present utility model, the terms "electrode" and "electrode plate" can be used interchangeably.

[0025] Air has a breakdown voltage limit, which varies with air humidity and is also related to the flatness and surface finish of the electrode plates of the electrostatic dust collection device. Generally, the breakdown voltage of air is considered to be 3 KV per millimeter. When the voltage between the electrodes exceeds this voltage, the air will be broken down. When designing an air filter, a conductive material is usually used as the electrode plate. Due to various reasons such as environmental changes, processing technology, and dust adsorption, the voltage that can usually be applied between the electrode plates is only half of the breakdown voltage of air. Some new processes can improve this data, but the final applied voltage cannot exceed the breakdown voltage of air.

[0026] A dust collector formed by wrapping a conductive material electrode plate with an insulating material (hereinafter referred to as the "strong electric field solution") is one of the current mainstream electrostatic dust collection device solutions. Since its conductive electrode is wrapped with an insulating material and not exposed to the air, it can ensure that no air breakdown occurs even when a voltage higher than the air withstand voltage value is applied. When the conductive material electrode plate is wrapped with an insulating material, the voltage that can be applied to the electrode is independent of the air withstand voltage and only related to the withstand voltage of the insulating material. For commonly used insulating materials such as PP (Polypropylene), PET (Polyethylene Terephthalate), ABS (Acrylonitrile Butadiene Styrene), PC (Polycarbonate), etc., an insulating material with a thickness of 0.1 mm can withstand a high voltage of several thousand volts, which is much higher than 3 kv / mm of air. Therefore, a dust collector adopting the strong electric field solution can apply a higher voltage to the electrode.

[0027] Figure 1 It shows a schematic diagram of the support structure between electrodes in the strong electric field solution.

[0028] See Figure 1 , since the surfaces of the positive and negative electrodes in the strong electric field solution are both insulating structures, there is no concern about the support structure causing a short circuit between the positive and negative electrodes initially. Therefore, the conventional practice in the industry is to directly connect the positive and negative electrodes in the strong electric field solution with a group of supports.

[0029] Figure 1 The blue pattern in it represents the negative electrode plate, the orange pattern represents the positive electrode plate, the purple pattern represents the insulating support plate, and the yellow line segment represents the support. As Figure 1 shown, a conventional practice is to connect the negative electrode plate, the positive electrode plate, and the insulating support plates on both sides with several supports, where each support is respectively connected to all the negative electrode plates, the positive electrode plates, and the insulating support plates on both sides.

[0030] During the operation of the electrostatic dust collection device, the support structure between the positive and negative electrodes will be contaminated, resulting in a leakage current between the positive and negative electrodes. In actual use, this leakage current can easily reach the level of 100 uA. The increase in the leakage current will increase the pressure on the power supply. Increasing the power supply driving ability will lead to an increase in cost. If the power supply driving ability is insufficient, it will also cause performance losses due to the increase in current and the decrease in voltage. The leakage current has no impact on electrode plates with low surface resistivity and good conductivity. When high surface resistivity materials are used for the electrode material, a small leakage current (such as 100 uA) will cause a large voltage drop, thus having a greater impact on performance.

[0031] Generally, the electrode plates are rectangular. Assuming the aspect ratio of the length to the width of the electrode plate is 5:1, the end-to-end resistance value of the electrodes in the electrostatic dust collection device is calculated through a table below.

[0032]

[0033]

[0034] Here, a supplementary description is made on the measurement method of the surface resistivity. Because it is found in practical applications that the measurement of the surface resistivity of the electrode is related to the applied voltage. The higher the applied voltage, the lower the measured value of the surface resistivity. Therefore, a regulation is made on the measurement method here. When measuring the surface resistivity of the negative electrode plate, the measurement result at a voltage of 1 kV is taken as the standard. All the test data mentioned in this disclosure are also measured under the condition of a voltage of 1 kV.

[0035] The above table shows the voltage drop brought by a 100 μA current to the electrodes under the condition that there are 100 dust collection electrodes, with 50 positive and negative electrodes each, and the current is evenly distributed on each electrode. Because generally the working voltage of the electrostatic dust collection device is in the order of several thousand volts, if this voltage is reduced by a few tens of volts, it can be considered that the impact on the performance is not significant. If the reduction reaches several hundred volts or higher, it will have a greater impact on the performance.

[0036] In view of this, the present utility model proposes that the support structure of the positive and negative electrode plates in the electrostatic dust collection device adopting the strong electric field scheme can be improved to reduce the pollution of the support structure between the positive and negative electrodes, thereby reducing the short-circuit leakage current, and further reducing the impact on the performance caused by the voltage drop brought by the short-circuit leakage current.

[0037] Figure 2 FIG. shows a schematic structural diagram of an electrostatic dust collection device according to an embodiment of the present utility model.

[0038] See Figure 2 , the electrostatic dust collection device includes a plurality of positive electrode plates 1 and a plurality of negative electrode plates 2. The plurality of positive electrode plates 1 and the plurality of negative electrode plates 2 are alternately arranged at intervals. Among them, the positive electrode plate 1 is connected to the positive pole of the high-voltage power supply, and the negative electrode plate 2 is connected to the negative pole of the high-voltage power supply. The positive electrode plate 1 can also be called the positive electrode. The negative electrode plate 2 can also be called the negative electrode.

[0039] At least one of the plurality of positive electrode plates and the plurality of negative electrode plates is a plate with a conductive material wrapped by an insulating material.

[0040] In some embodiments, both the positive electrode plate 1 and the negative electrode plate 2 in the electrostatic dust collection device can use an insulating material to wrap the conductive material plate. That is, all the electrode plates adopt the structure of an insulating material wrapping a conductive material. Thus, the electrical characteristics of the electrode plates themselves in the electrostatic dust collection device of the present utility model can adopt the existing strong electric field scheme.

[0041] In some embodiments, the electrical characteristics of the electrodes themselves in the electrostatic dust collection device can also be configured such that the positive electrode plate 1 is formed by using an insulating material to wrap a conductive material, and the edge of the conductive material is connected to the positive pole of the high-voltage power supply. The negative electrode plate 2 is a conductive electrode plate not wrapped with an insulating material, and the conductive material at the connection part of the positive electrode plate 1 and the power supply is exposed. That is, the connection part of the conductive material and the positive pole of the high-voltage power supply is not wrapped with an insulating material. This enables the electrostatic dust collection device to not only obtain the high-performance benefits of the strong electric field scheme in the initial stage but also maintain the long-term operation efficiency well to solve the defects existing in the strong electric field scheme. Thus, the electrical characteristics of the electrode plates themselves in the electrostatic dust collection device of the present utility model can also adopt the improved strong electric field scheme. Further, considering that the surface resistivity of the negative electrode plate 2 plays a decisive role in the purification performance of the polluted filter (i.e., the electrostatic dust collection device), the surface resistivity of the negative electrode plate 2 can be increased to effectively improve the purification performance of the polluted filter. Exemplarily, the surface resistivity of the negative electrode plate 2 can be configured to be greater than or equal to a first threshold. The specific value of the first threshold can be flexibly set according to the actual situation. In conventional designs, the most commonly used conductive electrodes include metal conductive materials, whose surface resistivity is negative. There are also conductive plastic materials, usually with a surface resistivity < 1E3Ω. The present utility model has found through experiments that when the surface resistivity of the negative electrode plate is greater than or equal to 1E6Ω, there is a significant improvement in the post-system pollution performance. When the surface resistivity of the negative electrode plate is greater than or equal to 1E7Ω, and even 1E8, there is a further improvement in the post-system pollution performance. Therefore, the first threshold mentioned above can be 1E6Ω, or it can also be 1E7Ω, or it can also be 1E8Ω.

[0042] The electrostatic dust collection device further includes a first support member 3, a second support member 4, and two groups of insulating support plates.

[0043] The first support member 3 is used to connect each positive electrode plate 1. The second support member 4 is used to connect each negative electrode plate 2.

[0044] Two groups of insulating support plates are respectively located on both sides of a plurality of positive electrode plates 1 and a plurality of negative electrode plates 2. Each group of insulating support plates includes at least one insulating support plate 5. The first support member 3 and the second support member 4 are also respectively connected to one of the insulating support plates 5 in each group of insulating support plates. The insulating support plate 5 in the same group of insulating support plates connected by the first support member 3 and the second support member 4 may also be the same insulating support plate or different insulating support plates. When the first support member 3 and the second support member 4 are connected to two different insulating support plates in the same group of insulating support plates, these two different insulating support plates may also be connected by a connecting member.

[0045] Figure 2 The schematic structural diagram shows the case where each group of insulating support plates includes one insulating support plate. It should be noted that each group of insulating support plates may also include two or more insulating support plates.

[0046] Taking the case where each group of insulating support plates includes one insulating support plate as an example, the first support member 3 and the second support member 4 are also respectively connected to the same insulating support plate in each group of insulating support plates.

[0047] Taking the case where each group of insulating support plates may also include two insulating support plates as an example, the first support member 3 and the second support member 4 may be respectively connected to different insulating support plates in each group of insulating support plates, and there may also be a connection between the insulating support plate connected to the positive electrode plate 1 through the first support member 3 and the insulating support plate connected to the negative electrode plate 2 through the second support member 4 by a connecting member.

[0048] Under the action of the polarization support (i.e., the support of the electrode plates) of the first support member 3 and the second support member 4, the positive electrode plate 1 and the negative electrode plate 2 are not directly connected through the support member, but are indirectly connected around the insulating support plates 5 on both sides under the support of different support members. When the surface of the insulating material of the support structure is contaminated, the conduction path between the positive and negative electrode groups must pass through the insulating support plates on both sides, which will greatly increase the distance of the short-circuit path, thereby reducing the short-circuit leakage current, and further reducing the influence on the performance caused by the voltage drop due to the leakage current.

[0049] Figure 2 The blue pattern in represents the negative electrode plate, the orange pattern represents the positive electrode plate, the purple pattern represents the insulating support plate, the yellow line segment represents the first support member, and the blue line segment represents the second support member. Refer to Figure 2 As shown in, the first support member connects each positive electrode plate and the insulating support plates at both side edges to support each positive electrode plate. The first support member does not connect to the negative electrode plate. The second support member connects each negative electrode plate and the insulating support plates at both side edges to support each negative electrode plate. The second support member does not connect to the positive electrode plate. Figure 2 The red dotted line shown in represents the short-circuit path caused by the contamination of the support structure.

[0050] Compared with Figure 1 directly connecting the positive and negative electrode plates using the same support member as shown, Figure 2 the polarized support structure shown can obviously greatly increase the distance of the short - circuit path between the positive and negative electrode plates, thereby reducing the short - circuit leakage current.

[0051] The present utility model also demonstrates the influence of the polarized support structure on the short - circuit leakage current through experiments.

[0052] The experimental content is as follows: Fabricate a filtering device with a filter screen sized 300 * 250mm, thickness 50mm, and sheet spacing 1.5mm. The negative electrode is made of a material with a specific surface resistivity, and the positive electrode is made by wrapping a conductive material with an insulating material. Use 3 different configuration schemes, and respectively test the CADR after smoking and observe the current in a purifier with an air volume of approximately 500m 3 / h. The test results are as follows.

[0053]

[0054]

[0055] As can be seen from the above table, after running for a period of time, the working current has increased. However, the working current value of the purification device with polarized support has increased little, while the current of the purification device with short - circuit support (i.e., Figure 1 the support structure shown) has increased very rapidly. The large increase in current will exert pressure on the power supply. Since a professional instrument - level regulated power supply is used for power supply during the test, in actual use, power supplies with a driving ability of only dozens or one or two hundred micro - amperes are often used. When the working current of the purification device exceeds the rated output current of the power supply, the power supply voltage will be pulled down and the performance will decline. At the same time, it can be observed that the device using a negative electrode with a higher surface resistivity shows an obvious efficiency decline during high - current operation. This is caused by the voltage drop formed by the resistance of the electrode itself and the passing current.

[0056] In some embodiments, there may be a certain distance between the insulating support plate and the adjacent electrode plate to increase the distance of the short - circuit path. That is, the structure between the insulating support plate and the adjacent electrode plate may not be a sealed structure, but may be a distance greater than 0.

[0057] In some embodiments, the electrostatic dust collection device may further include a shielding component. The shielding component is used to at least shield the gap between the insulating support plate and the adjacent electrode plate to prevent the gap from directly facing the unpurified gas.

[0058] Figure 3 is a schematic configuration diagram showing the shielding component according to an embodiment of the present utility model.

[0059] Figure 3 The green pattern in it is the shielding component, the purple line segment represents the insulating support plate, the red line segment represents the negative electrode plate, and the blue line segment represents the positive electrode plate. As Figure 3 shown, since there is no purification efficiency in the gap between the insulating support plate and the adjacent electrode plate (i.e., the edge electrode plate), some shielding components can be set. For example, a shielding component can be set for the edge electrode plates on both the left and right sides respectively to at least shield the gap between the insulating support plate and the edge electrode plate, so that air cannot pass between the edge electrode plate and the insulating support plate. In this way, on the one hand, the ineffective filtering area of the electrostatic dust collection device can be eliminated, and on the other hand, part of the support structure will not directly face the unobstructed polluted air. Although the polluted air can flow in through the gap to pollute the support part of the shielding part, the flow rate of this part of the air flow will be reduced a lot. Therefore, the supported component after shielding is less likely to be polluted, thereby reducing the short-circuit current after pollution between the positive and negative electrodes.

[0060] Figure 4 FIG. is a schematic configuration diagram showing a shielding component according to another embodiment of the present invention.

[0061] Referring to Figure 4 , in some embodiments, the shielding component can also be used to shield at least one electrode plate that is not adjacent to the insulating support plate (i.e., the non-edge electrode plate). That is to say, a part of the electrode plate with purification ability can also be arranged inside the shielding component to obtain better protection of the support path. As Figure 4 shown, most of the polluted air leaking into the shielding component from the gap will flow through the channel with purification ability, and only a smaller amount of pollutants can further penetrate into the insulating support components on both sides. Therefore, the support path can be better protected, and the short-circuit leakage current can be further reduced.

[0062] Figure 5 FIG. is a schematic configuration diagram showing a shielding component according to another embodiment of the present invention.

[0063] Referring to Figure 5, because the shielding component is added, the thickness of the electrostatic dust collection device increases. Or rather, under the condition of the same thickness, the thickness of the dust collection area of the filter screen decreases. The thickness of the dust collection area directly affects the performance of the dust collection area. In order to keep the thickness of the dust collection area unaffected by the frame as much as possible, the electrode plates can be made into two different sizes, wide and narrow, according to whether the electrode plates are shielded by the shielding component, that is, whether the electrode plates are located inside the shielding component. In the ventilation area outside the shielding component, wide-sized pole pieces are used, and the width of the pole piece is the same as the structural width of the shielding area. The width of the pole piece inside the shielding area is narrower, less than the inner width of the shielding component. That is to say, the width of the electrode plate not shielded by the shielding component is greater than the width of the electrode plate shielded by the shielding component. Moreover, the width of the electrode plate not shielded by the shielding component is the same as the width of the shielding area formed by the shielding component. In this way, it can not only ensure that the width of the electrode in the ventilation part is not affected by the shielding component, but also effectively support and protect the edge of the structure, reduce the short-circuit leakage current between the positive and negative electrodes, and maintain the high performance of the filtering device.

[0064] In summary, the utility model strengthens the support path between the positive and negative electrodes, making the support path less likely to be contaminated, thereby reducing the leakage current between the positive and negative electrodes. The benefits of this are, on the one hand, reducing the requirements for the power of the power supply, reducing the long-term operation power consumption and cost of the equipment, and at the same time being able to reduce the voltage drop on the surface of the electrodes, further maintaining the product performance.

[0065] The embodiments of the utility model have been described above. The above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments. The choice of terms used herein is intended to best explain the principles of the embodiments, the practical application, or the improvement of the technology in the market, or to enable other ordinary technical personnel in the technical field to understand the disclosed embodiments.

Claims

1. An electrostatic dust collection device, characterized in that, Comprising: A plurality of positive electrode plates and a plurality of negative electrode plates, the plurality of positive electrode plates and the plurality of negative electrode plates are alternately arranged at intervals respectively, the positive electrode plates are connected to the positive pole of a high-voltage power supply, the negative electrode plates are connected to the negative pole of the high-voltage power supply, and at least one of the plurality of positive electrode plates and the plurality of negative electrode plates is a plate with a conductive material wrapped by an insulating material; A first support member for connecting each of the positive electrode plates; A second support member for connecting each of the negative electrode plates; Two groups of insulating support plates, the two groups of insulating support plates are respectively located on both sides of the plurality of positive electrode plates and the plurality of negative electrode plates, each group of insulating support plates includes at least one insulating support plate, and the first support member and the second support member are also respectively connected to one of the insulating support plates in each group of insulating support plates.

2. The electrostatic dust collection device according to claim 1, wherein: Each group of insulating support plates includes one insulating support plate.

3. The electrostatic dust collection device according to claim 1, wherein: Each group of insulating support plates includes two insulating support plates, The first support member and the second support member are respectively connected to different insulating support plates in each group of insulating support plates, and the insulating support plate connected to the positive electrode plate through the first support member and the insulating support plate connected to the negative electrode plate through the second support member are also connected through a connecting member.

4. The electrostatic dust collection device according to any one of claims 1 to 3, wherein: There is a certain distance between the insulating support plate and the adjacent electrode plate.

5. The electrostatic dust collection device according to claim 4, wherein Further comprising: A shielding assembly for at least shielding the gap between the insulating support plate and the adjacent electrode plate to prevent the gap from directly facing the unpurified gas.

6. The electrostatic dust collection device according to claim 5, wherein: The shielding assembly is further used for shielding at least one electrode plate not adjacent to the insulating support plate.

7. The electrostatic dust collection device according to claim 6, wherein: The width of the electrode plate not shielded by the shielding assembly is greater than the width of the electrode plate shielded by the shielding assembly.

8. The electrostatic dust collection device according to claim 7, wherein: The width of the electrode plate not shielded by the shielding assembly is the same as the width of the shielding area formed by the shielding assembly.

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