Electrostatic dust collection device

Abstract

The present disclosure relates to an electrostatic precipitation 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, and the negative electrode plates are communicated with a negative electrode of the high-voltage power supply; one part of the positive electrode plates and one part of the negative electrode plates are formed by wrapping conductive materials with edge materials, and the other part of the positive electrode plates and the other part of the negative electrode plates are made of surface conductive materials. And the connecting part of the conductive material of the positive electrode plate and the positive electrode of the high-voltage power supply is not wrapped by an insulating material. Therefore, the electrostatic dust collection device not only has high purification efficiency initially, but also can improve long-term purification efficiency compared with a strong electric field scheme.

Description

Technical Field

[0001] The present disclosure relates to the technical field of electrostatic dust removal, and in particular to an electrostatic dust collecting device. Background Art

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

[0003] The electrostatic dust collector in the electrostatic precipitator is composed of discharge plates and dust collecting plates arranged alternately in parallel to form a strong electrostatic field to collect dust. The plate is the core component of the electrostatic dust collector. Its material and structure determine the purification capacity, cost, life, by-products, reliability, safety, etc. of the dust collector.

[0004] Air has a withstand voltage limit, which varies with air humidity and is also related to the flatness and surface finish of the plates of the electrostatic dust collector. It is generally believed that the withstand voltage of air is 3KV per millimeter. When the inter-electrode voltage exceeds this voltage, the air will be broken down. When designing air filters, conductive materials are usually used as electrode plates. Due to many reasons such as environmental changes, processing technology, and dust adsorption, the voltage that can be applied between the plates is usually only half of the air withstand voltage. Some new processes can improve this data, but the voltage that can be applied in the end cannot exceed the air withstand voltage.

[0005] The dust collector composed of conductive material plates wrapped with insulating materials (hereinafter referred to as "strong electric field solution") is one of the current mainstream electrostatic dust collection device solutions. Because its conductive electrodes are wrapped with insulating materials and are not exposed to the air, it can ensure that even when a voltage higher than the air withstand voltage is applied, there will be no air breakdown. The insulating material wraps the conductive material plate, and the voltage that can be applied to the electrode has nothing to do with the air withstand voltage, but only with the withstand voltage of the insulating material. Commonly used insulating materials, such as PP (Polypropylene), PET (Polyethylene Terephthalate), ABS (Acrylonitrile Butadiene Styrene), PC (Polycarbonate), etc., 0.1mm thick insulating materials can withstand thousands of volts of high voltage, which is much higher than the 3kv / mm of air. Therefore, the dust collector using the strong electric field solution can apply a higher voltage to the electrode.

[0006] A dust collector with a voltage higher than the withstand voltage of the air medium can be called a strong electric field electrostatic dust collector. Because the voltage applied to the air is positively correlated with the purification efficiency, the higher the voltage, the higher the purification efficiency. Therefore, the strong electric field electrostatic dust collector has a higher purification efficiency and a smaller size. In addition, due to the wrapping of the insulating material, the strong electric field electrostatic dust collector has an extremely low operating current and does not produce ozone, and has very excellent performance characteristics.

[0007] However, it is precisely because of the use of insulating materials that this type of dust collector also has obvious performance defects. That is, it is greatly affected by the air pressure resistance, resulting in a rapid performance degradation. This is because the air pressure resistance between parallel electrodes is not constant. The insulation of the electrode surface is destroyed due to the adsorption of pollutants, which reduces the air pressure resistance between the electrodes. The reduction in the electric field strength between the electrodes will directly lead to a decrease in the performance of the electrostatic dust collector.

[0008] Therefore, it is necessary to design a strong electric field electrostatic dust collector which has a higher initial purification efficiency and whose long-term purification efficiency can be improved compared to the strong electric field solution. Summary of the invention

[0009] A technical problem to be solved by the present disclosure is how to design a strong electric field electrostatic dust collector which has a relatively high initial purification efficiency and whose long-term purification efficiency can be improved compared to a strong electric field solution.

[0010] The present disclosure provides an electrostatic dust collection device, comprising: a plurality of positive electrode plates and a plurality of negative electrode plates, wherein the plurality of positive electrode plates and the plurality of negative electrode plates are arranged alternately at intervals, the positive electrode plates are connected to the positive electrode of a high-voltage power supply, and the negative electrode plates are connected to the negative electrode of the high-voltage power supply. A portion of the electrode plates among the plurality of positive electrode plates and the plurality of negative electrode plates are composed of a conductive material wrapped with an insulating material, and another portion of the electrode plates among the plurality of positive electrode plates and the plurality of negative electrode plates are composed of a surface conductive material. If there is a positive electrode plate composed of a conductive material wrapped with an insulating material, the connection portion between the conductive material of the positive electrode plate and the positive electrode of the high-voltage power supply is not wrapped with an insulating material.

[0011] Optionally, the electrode plates adjacent to the electrode plate formed of the surface conductive material are all electrode plates formed of a conductive material wrapped with an insulating material.

[0012] Optionally, the multiple positive electrode plates and the multiple negative electrode plates are divided into multiple groups of electrode plates, each group of electrode plates consists of two adjacent electrode plates, and at least one group of electrode plates among the multiple groups of electrode plates is configured such that one electrode plate in the group is composed of a conductive material wrapped with an insulating material, and the other electrode plate is composed of a surface conductive material.

[0013] Optionally, the positive electrode plate is made of a surface conductive material, and the negative electrode plate is made of a conductive material wrapped with an insulating material.

[0014] Optionally, the connection portion between the conductive material and the negative electrode of the high-voltage power supply is wrapped with an insulating material, or the connection portion between the conductive material and the negative electrode of the high-voltage power supply is not wrapped with an insulating material.

[0015] Optionally, the positive electrode plate is formed by insulating material wrapping a conductive material, and the negative electrode plate is formed by using a surface conductive material.

[0016] Optionally, the surface resistivity of the electrode plate formed of the surface conductive material is greater than or equal to a first threshold.

[0017] Optionally, the first threshold is 1E6Ω.

[0018] Optionally, the first threshold is 1E7Ω.

[0019] Optionally, the first threshold is 1E8Ω.

[0020] The present disclosure configures a part of the electrode plates among the multiple positive electrode plates and multiple negative electrode plates of the electrostatic dust collector to be composed of conductive materials wrapped by insulating materials, and configures the other part of the electrode plates to be composed of surface conductive materials, and if there is a positive electrode plate composed of conductive materials wrapped by insulating materials, the connection part between the conductive material of the positive electrode plate and the positive electrode of the high-voltage power supply is not wrapped with insulating materials. As a result, the electrostatic dust collector can obtain the high performance benefits of the strong electric field solution in the early stage, and at the same time, compared with the strong electric field solution, it can also maintain the long-term operation efficiency of the electrostatic dust collector well. Taking the positive electrode plate composed of conductive materials wrapped by insulating materials and the negative electrode plate composed of surface conductive materials as an example, during the working process, since the potential of the conductive electrode (i.e., the negative electrode plate) is stable, and the pollutants adsorbed on the surface insulating material of the insulating electrode (i.e., the positive electrode plate) will extend to the part of the conductive material that is not wrapped with insulating materials, thereby connecting with the high-voltage power supply, which enables the pollutants on the surface of the electrode to be driven by the power supply, so that the long-term operation efficiency of the electrostatic dust collector can be well maintained. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other objects, features and advantages of the present disclosure will become more apparent through a more detailed description of exemplary embodiments of the present disclosure in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components in the exemplary embodiments of the present disclosure.

[0022] Figure 1 Schematic diagram showing the structure of the electrode portion of an electrostatic precipitator according to an embodiment of the present disclosure.

[0023] Figure 2Schematic diagram showing the structure of the electrode portion of an electrostatic precipitator according to another embodiment of the present disclosure.

[0024] Figure 3 Schematic diagram showing the structure of an insulated electrode according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0025] The preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure 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 disclosure more thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art.

[0026] A complete electrostatic precipitator needs to include two parts: a charging device and a dust collecting device. The function of the charging device is to charge the fine particles in the air and make them charged. The dust collecting device absorbs the charged particles through the electrostatic field to achieve the effect of air purification. The present disclosure only involves improvements to the dust collecting device, but not to the charging device. Therefore, the present disclosure does not describe the charging device, but focuses on the dust collecting device. It should be known that the dust collecting device (i.e., the electrostatic dust collecting device) described in the present disclosure can be used in conjunction with the charging device to form a complete electrostatic precipitator. In other words, the electrostatic dust collecting device described in the present disclosure may also include a charging device to form a complete electrostatic precipitator. In addition, some of the test cases mentioned in the article are by default the results of tests with the charging device.

[0027] In this disclosure, the terms "electrode" and "electrode plate" may be used interchangeably.

[0028] First, the present disclosure demonstrates the defects of the strong electric field solution through experiments.

[0029] The strong electric field solution means that both the positive and negative electrodes of the dust collector are wrapped with conductive material plates using insulating materials.

[0030] The traditional ESP solution means that both the positive and negative electrodes of the dust collector use conductive material plates.

[0031] The experiment content is as follows: Use a filter with a size of 300*250mm, a thickness of 50mm, and a sheet spacing of 1.5mm, respectively, use a strong electric field solution and a traditional ESP solution, place the filters using the two different solutions in the air purifier, and test CADR (Clean Air Delivery Rate). The test results are as follows.

[0032] Strong electric field solution ESP Program CADR(m3 / h) 455 368

[0033] It can be seen that the initial CADR of the strong electric field solution is significantly better than that of the traditional ESP solution.

[0034] The present disclosure also uses the particle cumulative net content test method in Appendix C of the GB / T 18801-2022 Air Purifier standard to accelerate aging of the filters of the above two schemes by loading cigarette combustion products to observe changes in their purification capabilities. The specific test results are as follows.

[0035]

[0036]

[0037] It can be seen that the initial purification efficiency of the strong electric field solution is very high, but its purification ability decays quickly. After a period of use, its performance is actually worse than that of the traditional ESP solution.

[0038] In view of this, the present disclosure proposes to optimize the electrical characteristics of the electrode itself to construct a strong electric field electrostatic dust collector with high initial purification efficiency and long-term stable purification efficiency compared to strong electric field solutions.

[0039] That is to say, the present disclosure aims to prevent the performance from decreasing too much and still maintain a high purification efficiency when the surface insulating electrodes of the strong electric field electrostatic dust collector are contaminated and the air withstand voltage decreases.

[0040] The following is an exemplary description of how to improve the electrical properties of the electrode itself.

[0041] For the convenience of description, the electrode made of conductive material wrapped by insulating material is referred to as "insulating electrode" and the electrode made of surface conductive material is referred to as "conductive electrode".

[0042] After analysis, it was found that the main reason for the performance degradation of the strong electric field electrostatic dust collector was that the air withstand voltage decreased after the insulating electrode was contaminated. The strong electric field electrostatic dust collector has a very low power supply driving ability for surface pollutants, resulting in a high internal voltage of the insulating electrode, but the actual working voltage on the electrode surface is pulled down by the air, resulting in a significant performance degradation.

[0043] Based on this understanding, the present disclosure attempts to use the “insulated electrode + conductive electrode” approach to improve performance.

[0044] Since the traditional strong electric field electrostatic dust collector has both positive and negative electrodes as insulated electrodes, the pollutants on the surface of the positive and negative electrodes are all disconnected from the power supply, and the performance is greatly reduced due to surface contamination. However, through experiments, it was found that as long as one of the positive and negative electrodes is an insulated electrode and the other is a conductive electrode, the initial strong electric field characteristics of the electrostatic dust collector can be maintained. The specific test results are as follows:

[0045]

[0046] Considering that the positive and negative electrodes adsorb pollutants at different speeds. The positive electrode adsorbs more pollutants, while the negative electrode adsorbs fewer pollutants. If the negative electrode adopts an insulating electrode and the positive electrode adopts a conductive electrode, the pollutants on the surface of the conductive electrode (here is the positive electrode) can be directly connected to the corresponding power supply through the conductive electrode to be driven, while the insulated electrode (here is the negative electrode) has limited impact on performance due to fewer surface pollutants. Therefore, theoretically speaking, the electrostatic dust collector of "negative electrode adopts insulating electrode + positive electrode adopts conductive electrode" will delay the decline rate of purification efficiency while maintaining the initial strong electric field characteristics. If the negative electrode adopts a conductive electrode and the positive electrode adopts an insulating electrode, the pollutants on the surface of the conductive electrode (here is the negative electrode) are less and can be directly connected to the corresponding power supply through the conductive electrode to be driven, while the insulated electrode (here is the positive electrode) has more pollutants on the surface and cannot be driven from the corresponding power supply. Therefore, theoretically speaking, the electrostatic dust collector of "positive electrode adopts insulating electrode + negative electrode adopts conductive electrode" can only maintain the initial strong electric field characteristics, but cannot delay the decline rate of purification efficiency.

[0047] The present disclosure has conducted a set of experiments to verify the correctness of the above conclusions. The present disclosure has insulated the connection between the insulated electrode and the power supply so that the conductive part wrapped by the insulation is completely isolated from the unpurified air flowing through the purification device. At this time, a set of dust holding capacity experiments were conducted, and the test results are as follows:

[0048]

[0049] It can be seen that when the positive electrode is an insulated electrode, the performance decay rate becomes faster; and when the negative electrode is an insulated electrode, the performance decay rate is significantly reduced. Therefore, the electrostatic dust collector with the structure of "negative electrode using an insulated electrode + positive electrode using a conductive electrode" can be supported by theoretical and experimental data. It can obtain the high performance benefits of the strong electric field solution in the early stage, and at the same time, compared with the strong electric field solution, it can also maintain the long-term operating efficiency of the electrostatic dust collector well.

[0050] For an electrostatic dust collector with a structure of "an insulated electrode for the positive electrode and a conductive electrode for the negative electrode", in order to enable it to maintain the long-term operating efficiency of the electrostatic dust collector well, the present disclosure proposes that the connection portion between the conductive material of the insulated electrode (here, the positive electrode) and the positive electrode of the high-voltage power supply can be configured as an exposed portion that is not wrapped with insulating material. Therefore, although contamination of the surface of the insulated electrode will lead to performance degradation, once the pollutant is connected to the power supply connection portion corresponding to the insulated electrode, the pollutant on the surface of the insulated electrode will be energized, which is equivalent to turning the pollutant itself into a part of the electrode. Therefore, for an electrostatic dust collector with a structure of "an insulated electrode for the positive electrode and a conductive electrode for the negative electrode", by configuring the conductive material so that the connection portion with the positive electrode of the high-voltage power supply is not wrapped with insulating material, it is possible to obtain the high performance benefits of the strong electric field solution in the initial stage while also maintaining the long-term operating efficiency of the electrostatic dust collector well.

[0051] It should be noted that for the electrostatic dust collection device of "insulated electrode for negative electrode and conductive electrode for positive electrode", since there are fewer pollutants adsorbed on the negative electrode, whether the conductive material of the insulated electrode (here is the negative electrode) is configured so that the connecting part with the positive electrode of the high-voltage power supply is not wrapped with insulating material has little effect on the performance.

[0052] In view of this, the present disclosure also conducted experiments to demonstrate that the dust holding characteristics of three different configurations were tested when the connection between the conductive material of the insulated electrode (including the positive electrode and the negative electrode) and the high-voltage power supply was not wrapped with insulating material. The test data are as follows:

[0053]

[0054] It can be seen that the configuration of "negative electrode as insulating electrode + positive electrode as conductive electrode" has high initial efficiency and significantly improved dust holding capacity. However, the performance will continue to decline under continuous pollution, but the rate of decline can be slowed down compared with the strong electric field solution. The configuration of "positive electrode as insulating electrode + negative electrode as conductive electrode" also has high initial efficiency, and the efficiency declines faster than other solutions after pollution, but the efficiency stabilizes after a certain level and no longer continues to decline. The main reason is that the positive and negative electrodes adsorb pollutants at different rates. The positive electrode adsorbs more pollutants, so the efficiency of the positive electrode using the insulated electrode solution declines rapidly. However, the pollutants on the positive electrode quickly form a conductive path with the power supply, and the surface pollutants are driven by the power supply, thereby improving the performance after pollution.

[0055] In view of this, the present disclosure proposes that insulating electrodes and conductive electrodes can be combined to form an electrostatic dust collector. When all the electrodes adjacent to the conductive electrodes of the electrostatic dust collector are insulating electrodes, that is, when the conductive electrodes and the insulating electrodes are alternately arranged, it can work in a strong electric field state to achieve an improvement in initial efficiency. In view of this characteristic, the present disclosure sets one of the positive and negative electrodes (that is, a group of electrodes of the same type, that is, electrodes of the same polarity) as an insulating electrode, and the other (that is, another group, that is, another electrode of the same polarity) as a conductive electrode. Both schemes can effectively improve the dust holding capacity of the strong electric field electrostatic dust collector. The purification efficiency of the scheme with the negative electrode as an insulated electrode decreases relatively slowly during operation, but it is still in a state of continuous decline. The initial purification efficiency of the scheme with the positive electrode as an insulated electrode decreases quickly during operation, but it is also slower than the purification efficiency of the scheme with both positive and negative electrodes using insulation, and the purification efficiency of this scheme tends to stabilize after decreasing to a certain extent and no longer decreases.

[0056] The electrostatic dust collector disclosed in the present invention belongs to a strong electric field electrostatic dust collector. A strong electric field electrostatic dust collector refers to an electrostatic dust collector in which the voltage applied to the air medium is higher than the air withstand voltage value. The present invention aims to improve the long-term effectiveness of the strong electric field electrostatic dust collector.

[0057] Figure 1 Schematic diagram showing the structure of the electrode portion of an electrostatic precipitator according to an embodiment of the present disclosure.

[0058] Figure 2 Schematic diagram showing the structure of the electrode portion of an electrostatic precipitator according to another embodiment of the present disclosure.

[0059] See also Figure 1 , Figure 2 The electrostatic dust collector 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 arranged alternately and at intervals. The positive electrode plate 1 is connected to the positive electrode of the high-voltage power supply, and the negative electrode plate 2 is connected to the negative electrode of the high-voltage power supply. The positive electrode plate 1 can also be called a positive electrode. The negative electrode plate 2 can also be called a negative electrode.

[0060] Some of the plurality of positive electrode plates 1 and the plurality of negative electrode plates 2 are made of an insulating material wrapped with a conductive material, and the other portion of the plurality of positive electrode plates 1 and the plurality of negative electrode plates 2 are made of a surface conductive material.

[0061] The electrode plate composed of a conductive material wrapped by an insulating material can be either a positive electrode plate 1 or a negative electrode plate 2. Similarly, the electrode plate composed of a surface conductive material can be either a positive electrode plate 1 or a negative electrode plate 2. If there is a positive electrode plate 1 composed of a conductive material wrapped by an insulating material, the connection portion between the conductive material of the positive electrode plate 1 and the positive electrode of the high-voltage power supply is not wrapped with an insulating material.

[0062] In some embodiments, a plurality of positive electrode plates 1 and a plurality of negative electrode plates 2 may be divided into a plurality of groups of electrode plates, each group of electrode plates being composed of two adjacent electrode plates (one being a positive electrode plate and the other being a negative electrode plate). Among the plurality of groups of electrode plates, at least one group of electrode plates may adopt "insulating electrode + conductive electrode". That is, at least one group of electrode plates may be configured such that one electrode plate in the group of electrode plates (which may be a positive electrode plate or a negative electrode plate) is composed of an insulating material wrapped with a conductive material, and the other electrode plate (which may be a negative electrode plate or a positive electrode plate) is composed of a surface conductive material. Among the plurality of groups of electrode plates, one or more groups of electrode plates may not adopt the configuration of "insulating electrode + conductive electrode", but may adopt the configuration of "insulating electrode + insulating electrode" or "conductive electrode + conductive electrode".

[0063] In some embodiments, the electrode plates adjacent to the electrode plates made of surface conductive materials are all electrode plates made of conductive materials wrapped by insulating materials. That is, the electrode plates made of surface conductive materials and the electrode plates made of conductive materials wrapped by insulating materials can be arranged alternately. In other words, the electrode plates with the same polarity have the same electrical configuration. That is, the electrode plates with the same polarity are either all made of surface conductive materials or all made of conductive materials wrapped by insulating materials. For example Figure 1 As shown, the positive electrode plate 1 may be formed by insulating material wrapped with a conductive material, and the negative electrode plate 2 may be formed by using a surface conductive material. Figure 2 As shown, the positive electrode plate 1 may be formed of a surface conductive material, and the negative electrode plate 2 may be formed of a conductive material wrapped by an insulating material. When the negative electrode plate 2 is formed of a conductive material wrapped by an insulating material, the connection portion between the conductive material and the negative electrode of the high-voltage power supply may be wrapped with an insulating material or may not be wrapped with an insulating material.

[0064] by Figure 1 Taking the positive electrode plate 1 shown as being composed of an insulating electrode plate as an example, the edge of the conductive material is connected to the positive electrode of the high-voltage power supply, and the connecting portion between the conductive material and the positive electrode of the high-voltage power supply is not wrapped with insulating material. Figure 1 The red part wrapped in blue on the right side is the positive electrode plate 1. The positive electrode plate 1 is an insulating plate. The conductive material of the positive electrode plate 1 is connected to the positive electrode of the high voltage power supply (i.e. Figure 1The red part (not wrapped in blue) on the right side connected to the positive electrode of the high-voltage power supply is not wrapped with insulating material, so that the pollutants adsorbed on the positive electrode plate 1 during operation will extend to the conductive material part not wrapped with insulating material, thereby connecting to the positive electrode of the high-voltage power supply. The insulating material can be but is not limited to PP (Polypropylene), PET (Polyethylene Terephthalate), ABS (AcrylonitrileButadieneStyrene), PC (Polycarbonate), etc. The thickness of the insulating material can be flexibly set according to actual conditions.

[0065] like Figure 1 As shown, when the blue insulating material is contaminated by conductive pollutants, the conductive pollutants will extend along the surface of the insulating material to the right power terminal, enabling the power supply to drive the conductive pollutants on the surface, thereby improving the performance of the filter (i.e., the electrostatic dust collector).

[0066] The negative electrode plate 2 is a conductive plate that is not wrapped with insulating material. The red horizontal line on the left side of the figure is the negative electrode plate 2. The negative electrode plate 2 is a conductive material electrode. The area between the positive electrode plate 1 and the negative electrode plate 2 is the effective filtering area. The alternating positive electrode plates 1 and negative electrode plates 2 can form an electrostatic dust collection filter. Unpurified gas can pass through the electrostatic dust collection filter to remove pollutants.

[0067] Figure 3 Schematic diagram showing the structure of an insulated electrode according to an embodiment of the present disclosure.

[0068] See also Figure 3 , the insulating electrode is divided into two layers from the inside to the outside. The inner layer, that is, the middle part (i.e. Figure 3 The red part shown in the figure is the conductive layer. Figure 3 The orange part shown in the figure is an insulating layer. The conductive layer is led out in at least one direction to be connected to a power source. The part of the conductive layer led out in one direction for connecting to a power source is exposed, that is, the part is not covered by the insulating layer.

[0069] by Figure 1 For example, by configuring the electrical characteristics of the electrodes of the electrostatic precipitator themselves as follows: the positive electrode uses an insulating wrapped conductive material, the negative electrode uses a conductive plate, and the conductive material of the positive electrode connected to the power supply is exposed, the electrostatic precipitator can not only obtain the high performance benefits of the strong electric field solution in the initial stage, but also maintain the long-term operating efficiency well, so as to solve the defects of the strong electric field solution.

[0070] Further, the present disclosure provides the above configuration (such as Figure 1 , Figure 2 After an in-depth analysis of the electrostatic dust collector of the invention, it was found that the surface resistivity of the conductive electrode plate also plays a role in the purification performance of the filter after contamination. The reasons are as follows.

[0071] by Figure 1 Taking the conductive electrode plate shown as the negative electrode plate and the insulating electrode plate as the positive electrode plate as an example, the surface resistivity of the negative electrode plate connected to the power supply will affect the performance after pollution. When the surface of the positive electrode plate 1 is completely insulated, the air withstand voltage between the positive electrode plate 1 and the negative electrode plate 2 has little to do with the surface resistivity of the negative electrode. However, when the surface insulation properties of the surface of the positive electrode plate 1 are destroyed due to the adsorption of pollutants, the air withstand voltage between the electrodes is jointly determined by the surface resistivity of the positive electrode plate 1 and the negative electrode plate 2. At this time, the surface resistivity of the negative electrode plate 2 will play a decisive role. This is because, at this time, the surface resistivity of the positive electrode plate 1 is greatly affected by the adsorbed pollutants, while the amount of dust adsorbed by the negative electrode plate is small, so that the surface resistance of the negative electrode plate 2 is also less affected by the pollutants, so that the surface resistivity of the negative electrode plate 2 will play a decisive role.

[0072] Considering that the surface resistivity of the conductive electrode plate (such as the negative electrode plate) plays a decisive role in the purification performance of the post-contaminated filter, the present disclosure proposes that the surface resistivity of the conductive electrode plate can be increased to effectively improve the purification performance of the post-contaminated filter. Exemplarily, the surface resistivity of the conductive electrode plate 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 actual conditions.

[0073] In conventional designs, the most commonly used conductive electrodes include metal conductive materials with a negative surface resistivity. Conductive plastic materials are also used, usually with a surface resistivity <1E3Ω. The present disclosure has found through experiments that when the surface resistivity of the negative electrode plate is greater than or equal to 1E6Ω, the performance of the system begins to improve significantly after contamination. When the surface resistivity of the negative electrode plate is greater than or equal to 1E7Ω, or even 1E8, the performance of the system after contamination is further improved. Therefore, the first threshold mentioned above can be 1E6Ω, or it can also be 1E7Ω, or it can also be 1E8Ω.

[0074] The present disclosure also demonstrates through experiments the effect of increasing the surface resistivity of the conductive electrode plate on the performance of the system after pollution.

[0075] Here, only the case where the negative electrode plate is a conductive plate is tested. The experimental contents are as follows: a filter device with a filter screen of 300*250mm in size, 50mm in thickness, and 1.5mm in sheet spacing is made. The negative electrode of the strong electric field electrostatic dust collector is made of three materials with different surface resistivities. The positive electrode is an insulating plate and placed in an air purifier to test the initial CADR and the CADR after smoking. The test results are as follows.

[0076]

[0077] The first column in the table above is the data of the previous use of low-resistance conductive electrodes. It can be seen that when the conductive electrode plates were replaced with materials with surface resistivity of 1E6, 1E7, and 1E8Ω, the CADR after loading the pollutants increased to varying degrees, indicating that the higher the resistivity of the electrode, the better the performance after contamination.

[0078] Here is a supplementary explanation of the surface resistivity measurement method. Because it is found in actual applications that the surface resistivity measurement of the electrode is related to the applied voltage. The higher the applied voltage, the lower the measured surface resistivity value. Therefore, a regulation is made here for the measurement method. When measuring the surface resistivity of the negative electrode plate, the measurement result of 1 kilovolt voltage shall prevail. All test data mentioned in this disclosure are also measured under 1 kilovolt voltage conditions.

[0079] In summary, the present invention has all the advantages and features of the strong electric field solution, which can make the air carry a voltage higher than the withstand voltage limit, thereby bringing about an initial high purification performance and a small size. At the same time, due to the use of insulating electrodes and conductive electrodes arranged at intervals, the electrical driving ability of pollutants on the electrode surface is improved, and the use of conductive electrodes with high surface resistivity further improves the performance, so that the long-term operating efficiency of the strong electric field electrostatic dust collector can be maintained, the speed of performance degradation is slowed down, and the degree of performance degradation is greatly reduced.

[0080] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terms used herein are selected to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. An electrostatic dust collector, characterized in that: include: A plurality of positive electrode plates and a plurality of negative electrode plates, wherein the plurality of positive electrode plates and the plurality of negative electrode plates are arranged alternately and spaced apart, the positive electrode plates are connected to the positive electrode of a high-voltage power supply, and the negative electrode plates are connected to the negative electrode of a high-voltage power supply, The plurality of positive electrode plates and a portion of the plurality of negative electrode plates are formed by wrapping a conductive material with an insulating material, and another portion of the plurality of positive electrode plates and the plurality of negative electrode plates are formed by using a surface conductive material. If there is a positive electrode plate formed by wrapping a conductive material with an insulating material, the connection portion between the conductive material of the positive electrode plate and the positive electrode of the high voltage power source is not wrapped with an insulating material.

2. The electrostatic dust collector according to claim 1, characterized in that: The electrode plates adjacent to the electrode plate formed of the surface conductive material are all electrode plates formed of a conductive material wrapped with an insulating material.

3. The electrostatic dust collector according to claim 1, characterized in that: The multiple positive electrode plates and the multiple negative electrode plates are divided into multiple groups of electrode plates, each group of electrode plates consists of two adjacent electrode plates, and at least one group of electrode plates among the multiple groups of electrode plates is configured as follows: one electrode plate in the group is composed of a conductive material wrapped with an insulating material, and the other electrode plate is composed of a surface conductive material.

4. The electrostatic dust collector according to claim 1, characterized in that: The positive electrode plate is made of a surface conductive material, and the negative electrode plate is made of a conductive material wrapped with an insulating material.

5. The electrostatic dust collector according to claim 4, characterized in that: The connection portion between the conductive material and the negative electrode of the high voltage power supply is wrapped with insulating material, or The connection portion between the conductive material and the negative electrode of the high voltage power supply is not wrapped with insulating material.

6. The electrostatic dust collector according to claim 1, characterized in that: The positive electrode plate is formed by insulating material wrapping a conductive material, and the negative electrode plate is formed by using a surface conductive material.

7. The electrostatic dust collector according to any one of claims 1 to 6, characterized in that: The surface resistivity of the electrode plate formed of the surface conductive material is greater than or equal to the first threshold.

8. The electrostatic dust collector according to claim 7, characterized in that: The first threshold is 1E6Ω.

9. The electrostatic dust collector according to claim 7, characterized in that: The first threshold is 1E7Ω.

10. The electrostatic dust collector according to claim 7, characterized in that: The first threshold is 1E8Ω.

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