Electric dust collection apparatus and dust particle collection method using same

Abstract

Provided are: an electric dust collection apparatus capable of more reliably recovering captured and collected dust particles while operating; and a dust particle collection method using the same.　This electric dust collection apparatus has a structure in which an ionizer 1, a dust collector 2, and a recovery device 3 are built into a housing 6, wherein: the dust collector 2 has a first roller 7 and a second roller 8 and has an endless belt 9 wound around these rollers; the endless belt 9 includes electrodes 10a and 10b on the inside surface thereof; and by rotating the endless belt 9, one of the electrodes 10a and 10b is brought into contact with the second roller to which a voltage having a reverse polarity to a polarity of ions generated by the ionizer is applied, to adsorb dust particles, and the adsorbed dust particles are recovered at a position corresponding to the other electrode.

Description

Electrostatic precipitator and method for collecting dust particles using the same

[0001] The present invention relates to an electrostatic precipitator that electrically collects dust particles in the air, and a method for collecting dust particles using the same.

[0002] Electrostatic precipitators are widely used to remove particles such as dust and dirt, as well as pollen and smoke (collectively referred to as dust particles) from the air.

[0003] Electrostatic precipitators separate dust particles from the air by electrically charging them and causing them to migrate toward an electrode with the opposite polarity. For example, a negative (-) charge is applied to the dust particles, attracting them to a positive (+) electrode to which high voltage is applied. This type of dust collection method is used in a variety of applications, including air purifiers used in homes, hospitals, department stores, and other residential buildings, as well as to meet the high levels of cleanliness required in precision machinery and electronic equipment manufacturing, and to address safety and environmental hygiene concerns in factories handling textiles, wood, resins, and other materials.

[0004] Known examples of the dust collection method include an electrostatic precipitator that includes a flat substrate on which a linear cathode and plate-shaped anodes are arranged parallel to the cathode on both sides, and a high voltage is applied between these electrodes from a high-voltage power supply to generate a corona discharge between the cathode and the anode, thereby charging dust particles in the air and capturing and collecting the dust particles on the anode side (see, for example, Patent Documents 1 and 2).

[0005] Also known is an electrostatic precipitator that includes an ionizer for charging dust particles in the air, a collector for capturing the dust particles charged by the ionizer, and a filter unit, where the collector is configured with an electrode connected to the positive electrode side of a high-voltage power supply and an electrode connected to the negative electrode (ground) side thereof, thereby capturing and collecting the dust particles negatively charged by the ionizer on the electrode side of the collector connected to the positive electrode (see, for example, Patent Documents 3 and 4).

[0006] Furthermore, in an electrostatic precipitator equipped with an ionizer and a dust collector as described above, the dust collector is formed from a high-voltage electrode made up of a plurality of linear conductors and a plate-shaped electrode arranged downstream of this high-voltage electrode, and a voltage of the same polarity as that applied to the ionizer is applied to the high-voltage electrode, and a voltage of the opposite polarity is applied to the plate-shaped electrode, thereby preventing discharge between the ionizer and the dust collector, while allowing for miniaturization and thinning, and providing excellent dust collection capacity (see Patent Document 5).

[0007] JP-A-61-220747, JP-A-7-256145, JP-A-8-71451, JP-A-9-253525, International Publication No. 2021 / 131519 pamphlet

[0008] Currently, research and development is being conducted on electrostatic precipitators, which are widely used, to further improve their performance, such as by increasing the dust collection capacity. One of the issues being considered is the recovery of collected dust particles.

[0009] As described above, in an electrostatic precipitator, dust particles charged by an ionizer or the like are attracted to and adhere to an electrode carrying an opposite charge. As the dust collection process progresses, the dust particles form a layer of dust particles, i.e., a dust layer, on the collecting electrode. The thicker this dust layer becomes, the weaker the suction force of the electrode that collects the dust particles becomes. Therefore, to maintain the dust collection capacity of the electrostatic precipitator, it is necessary to periodically collect the dust layer.

[0010] However, to reliably collect the dust layer consisting of charged dust particles, it is necessary to remove the charge from the collecting electrode, which requires the electrostatic precipitator to be shut down, and therefore, in order to operate the equipment efficiently, it is important to find a way to shorten the equipment downtime.

[0011] Therefore, the inventors conducted extensive research to solve the above problems, and as a result, they discovered that in an electrostatic precipitator equipped with an ionizer, a dust collector, and a dust particle recovery device, by adopting a conveyor-type configuration as the dust collector in which an endless belt with two electrodes on its inner surface is wound around two rollers, and by rotating the endless belt while the two electrodes are alternately charged and de-charged via the two rollers, it is possible to more reliably recover a dust layer made up of dust particles, and to do so while the electrostatic precipitator is operating, and thus completed the present invention.

[0012] Therefore, an object of the present invention is to provide an electrostatic precipitator equipped with a self-cleaning mechanism that can more reliably recover captured and collected dust particles while the electrostatic precipitator is in operation, thereby enabling efficient dust collection.

[0013] Another object of the present invention is to provide a method for collecting dust particles, which can efficiently collect dust particles using the above-mentioned electrostatic precipitator.

[0014] That is, the present invention provides an electric dust collector comprising an ionizer that generates ions from electrode needles by corona discharge to charge dust particles in the air, a dust collector having an endless belt wound around a first roller and a second roller and that captures dust particles with the endless belt, and a collector that recovers dust particles that have adhered to the endless belt of the dust collector, wherein the endless belt of the dust collector has a conductive film laminated on its inner surface, and the conductive film has two gaps that are discontinuous in the longitudinal direction of the endless belt, thereby forming two electrodes, and either or both of the first roller and second roller of the dust collector are connected to a rotating device that can rotate the endless belt, and the first roller is electrically insulated from the conductive film of the endless belt, and the second roller can be electrically energized with respect to the conductive film of the endless belt, and a voltage of a polarity opposite to that of ions generated by the electrode needles of the ionizer is applied to the second roller, In the electrostatic precipitator, when the endless belt rotates, while one of the two electrodes, electrode X, is in contact with the second roller, the surface of the endless belt at a position corresponding to electrode X is charged to form a charged area, and then, while electrode X is in contact with the first roller, the surface of the endless belt at the position corresponding to electrode X is decharged to form a de-electrified area.

[0015] The present invention also provides a method for collecting dust particles in the air using an electrostatic precipitator, the electrostatic precipitator comprising: an ionizer that generates ions from electrode needles by corona discharge to charge dust particles in the air; a dust collector having an endless belt wound around first and second rollers and that captures dust particles with the endless belt; and a collector that recovers dust particles adhered to the endless belt of the dust collector, wherein the endless belt of the dust collector has a conductive film laminated on its inner surface, and the conductive film has two gaps that are discontinuous in the longitudinal direction of the endless belt, thereby forming two electrodes; and either or both of the first and second rollers of the dust collector are connected to a rotating device that rotates the endless belt, and the first roller is electrically insulated from the conductive film of the endless belt, and the second roller is electrically conductive to the conductive film of the endless belt, and a voltage of a polarity opposite to that of ions generated by the electrode needles of the ionizer is applied to the second roller. When the endless belt rotates in the dust collector, while one of the two electrodes, electrode X, is in contact with the second roller, the surface of the endless belt at a position corresponding to electrode X is charged to form a charged area, and then while electrode X is in contact with the first roller, the surface of the endless belt at the position corresponding to electrode X is decharged to form a decharged area.When collecting dust particles in the air using the above-mentioned electrostatic precipitator, the endless belt is rotated by the first roller and / or second roller in the dust collector, and two electrodes attached to the inner surface of the endless belt are brought into contact with the first roller and the second roller, thereby generating charged areas and decharged areas alternately on the endless belt to collect dust particles in the air and recover the dust particles collected by the endless belt.

[0016] The dust collector in the electrostatic precipitator of the present invention has a first roller and a second roller around which an endless belt is wound, and one or both of the first roller and the second roller are connected to a rotating device that rotates the endless belt, and collects (captures) dust particles while rotating the endless belt like a conveyor.

[0017] Here, the endless belt has a conductive film laminated on its inner surface, and this conductive film has two gaps that are discontinuous in the longitudinal direction of the endless belt. That is, two electrodes are arranged on the inner surface of the endless belt, separated in the longitudinal direction of the endless belt. The two gaps in the conductive film are not particularly limited as long as they form two electrically independent electrodes with respect to the first roller and the second roller so as to perform the functions described below and prevent discharge between the electrodes. The width and shape of the gaps in the longitudinal direction of the endless belt are not particularly limited. Furthermore, the pitch (spacing) at which the two gaps are formed is not particularly limited, but it is preferable that the two electrodes be equally spaced in the longitudinal direction (rotational direction) of the endless belt. In other words, it is preferable that the lengths of the two electrodes are equal (approximately equal).

[0018] Furthermore, one of the two rollers in the dust collector (the first roller) is electrically insulated from the conductive film of the endless belt that forms the two electrodes, and preferably, this first roller is grounded.

[0019] The other roller (second roller) is electrically conductive to the conductive film of the endless belt that also forms two electrodes, and is connected to a high-voltage power supply to apply a voltage of the opposite polarity to the polarity of the ions generated by the electrode needle of the ionizer (constituting the electrostatic precipitator). Preferably, the electrostatic precipitator further includes a linear wire electrode to which a voltage is applied between the second roller and the wire electrode. In this case, a voltage of the same polarity as the polarity of the ions generated by the electrode needle of the ionizer is applied to the wire electrode.

[0020] As a result, when the endless belt rotates in the dust collector, while one of the two electrodes formed on the inner surface of the endless belt (this electrode will be referred to as electrode X) is in contact with the second roller, the surface of the endless belt is charged at a position corresponding to electrode X, forming a charged area. Meanwhile, the other electrode (this electrode will be referred to as electrode Y) is in contact with the first roller without contacting the second roller, and electrode Y is in an uncharged state.

[0021] Next, as the endless belt rotates, electrode X comes into contact with the first roller and is no longer in contact with the second roller, whereby electrode X is de-ionized. That is, the surface of the endless belt at the position corresponding to electrode X is de-ionized, forming a de-ionized area. During this time, electrode Y comes into contact with the second roller, and this time the surface of the endless belt at the position corresponding to electrode Y is charged, forming a charged area. That is, as the endless belt rotates, the two electrodes formed on the inner surface of the endless belt alternate between a charged state and a non-charged state, whereby the surface of the endless belt at the position corresponding to one electrode (electrode X) becomes a charged area, and the surface of the endless belt at the position corresponding to the other electrode (electrode Y) becomes a non-charged area (de-ionized area).

[0022] The ionizer in the electrostatic precipitator of the present invention may be any known ionizer that can generate ions from electrode needles by corona discharge to charge dust particles in the air. As described above, the charged area formed on a portion of the surface of the endless belt is charged with a polarity opposite to that of the dust particles charged by the ionizer, so that the charged dust particles are attracted to and captured by the charged area on the surface of the endless belt.

[0023] On the other hand, the charged area of ​​the endless belt where the dust particles are trapped becomes a non-charged area (discharged area) when the corresponding electrode comes into contact with the first roller and no longer comes into contact with the second roller as the endless belt rotates. As a result, the remaining adsorptive force (electrically attractive force) of the dust particles trapped on the surface of the endless belt disappears.

[0024] Therefore, in the electrostatic precipitator of the present invention, a collector collects dust particles adhering to the endless belt. Since the adsorptive force of the dust particles on the endless belt is lost during this process, the dust particles can be collected without being left behind on the endless belt. The collector is not particularly limited, and examples include a brush that scrapes off dust particles adhering to the non-charged area (charge-removing area) of the endless belt, a suction device that vacuums the dust particles, and the like. Among these, a collector equipped with a brush that scrapes off dust particles adhering to the endless belt and a collection box that collects the scraped dust particles is preferred, since it does not generate excessive airflow in the surrounding area.

[0025] In this way, an electrostatic precipitator equipped with an ionizer that generates ions from electrode needles by corona discharge to charge dust particles in the air, a dust collector that has an endless belt wound around a first roller and a second roller and captures dust particles with the endless belt, and a collector that recovers dust particles adhered to the endless belt of the dust collector, rotates the endless belt with the first roller and / or the second roller of the dust collector and brings two electrodes attached to the inner surface of the endless belt into contact with the first roller and the second roller, thereby generating alternate charged areas and neutralized areas on the endless belt to capture and collect dust particles in the air and making it possible to recover the dust particles captured (trapped) by the endless belt.

[0026] In particular, according to the present invention, by rotating the endless belt in the dust collector, charged areas and uncharged areas can be alternately formed on the surface of the endless belt, so that the electrostatic precipitator can be used as an electrostatic precipitator equipped with a self-cleaning mechanism without having to be stopped.

[0027] The electrostatic precipitator of the present invention can capture and collect dust particles such as dust, dirt, pollen, smoke, etc. contained in the air. There are no particular limitations on its applications, and it can be used in a variety of settings, such as air purifiers for home use, hospitals, department stores, houses, etc., as well as in factories that manufacture precision machinery and electronic devices, clean rooms where semiconductors are manufactured, and processing plants that handle textiles, wood, resins, etc.

[0028] According to the present invention, by rotating the endless belt in the dust collector, charged and uncharged regions can be alternately formed on the surface of the endless belt, allowing the electrostatic precipitator to collect trapped dust particles while it is operating. In particular, because the collection of dust particles is carried out in the uncharged regions (discharged regions) of the endless belt, the adsorptive force of the dust particles is eliminated, allowing the dust particles to be collected more reliably. Therefore, it can be said that this is an electrostatic precipitator that can collect dust efficiently.

[0029] FIG. 1 is a perspective view of an electrostatic precipitator according to an embodiment of the present invention. FIG. 2(a) is a perspective view of an endless belt, and FIG. 2(b) is a cross-sectional view taken along the line A-A in FIG. 2(a). FIG. 3 is a schematic diagram of a dust collector. FIG. 4 is a diagram illustrating the charging of two electrodes on an endless belt. FIG. 5 is another diagram illustrating the charging of two electrodes on an endless belt. FIG. 6 is a diagram illustrating the trapping and collection of dust particles in the air by an electrostatic precipitator (focusing on the state where dust particles are attracted to the endless belt). FIG. 7 is another diagram illustrating the trapping and collection of dust particles in the air by an electrostatic precipitator (focusing on the state where the electrical attraction of dust particles disappears due to the rotation of the endless belt). FIG. 8 is another diagram illustrating the trapping and collection of dust particles in the air by an electrostatic precipitator (focusing on the state where dust particles are scraped off the endless belt by a brush).

[0030] Hereinafter, the best mode of the present invention will be described with reference to the drawings.

[0031] An example of an electrostatic precipitator according to the present invention is shown in Figure 1. The electrostatic precipitator according to this embodiment has a structure in which an ionizer 1, a dust collector 2, and a collector 3 are incorporated into a housing 6.

[0032] The housing 6 is made of aluminum or the like and is an insulating rectangular frame with openings on the front face (the front side in FIG. 1 ) and rear face (the rear side in FIG. 1 ), and the ionizers 1 are attached to two locations on the inner wall surface of the front section (the front side) of the housing 6. The dust collector 2 is attached to the housing 6 from the middle to the rear section, and the recovery unit 3 is disposed below the dust collector 2 (vertically below in this example).

[0033] The ionizer 1 generates ions from a built-in electrode needle (not shown in FIG. 1) by corona discharge, and can charge dust particles in the air. This ionizer 1 is a DC ionizer, and is connected to the negative pole of a high-voltage power supply (not shown in FIG. 1), as will be described later.

[0034] That is, a negative DC voltage from a high-voltage power supply is applied to the electrode needle of the ionizer 1, thereby generating a corona discharge at the tip of the electrode needle built into the ionizer 1. Because a voltage of 3 kV or more is required to be applied to the ionizer 1 to generate ions, it is preferable to use a DC power supply capable of applying this voltage as the high-voltage power supply. The polarity of the voltage applied to the ionizer 1 is arbitrary. While this electrostatic precipitator is configured to apply a negative DC voltage, it may also be connected to the positive pole of the high-voltage power supply and apply a positive DC voltage. Furthermore, the ionizers 1 were installed at two locations on the inner wall surface in front of the housing 6 so that the ions generated from the electrode needle would diffuse before the dust collector 2.

[0035] The dust collector 2 electrically collects dust particles carrying ions and includes a first roller 7, a second roller 8, and an endless belt 9 wound around them. The endless belt 9 is made of an electrically insulating material, such as an insulating polymer, such as polyurethane, polyethylene, or polyimide. Furthermore, as shown in FIG. 2 , a conductive film 10 made of a conductive material, such as copper, aluminum, silver, or iron, is laminated on the inner surface of the endless belt 9. This conductive film 10 has two gaps 11 that are discontinuous along the length of the endless belt 9, thereby providing two electrodes 10a and 10b on the inner surface of the endless belt 9. The width of this gap 11 (i.e., the distance between electrodes 10a and 10b) is difficult to specify because it varies depending on the size (diameter) of the first and second rollers, the size of the endless belt, the voltage applied to the electrodes, and other factors. However, a width of approximately 1 cm is desirable to prevent discharge between electrodes 10a and 10b. Furthermore, the pitch (spacing) at which the two gaps are formed is not particularly limited, but in this example, the lengths of the two electrodes 10a and 10b (the length in the direction of rotation of the endless belt) are made equal.

[0036] Of the first roller 7 and the second roller 8, the first roller 7 is electrically insulated from the conductive film 10 of the endless belt 9. As shown in FIG. 3 , the first roller 7 is mechanically connected to a rotary motor (rotating device) 12 that transmits rotation to rotate the endless belt 9. The first roller 7 may be formed of an electrically insulating material such as an insulating polymer, such as fluororesin or Teflon (registered trademark). Alternatively, the surface of the roller may be coated with various insulating polymers to electrically insulate the first roller 7 from the conductive film 10. The first roller 7 may also be provided with a urethane layer, for example, to provide sufficient gripping force to the endless belt and to provide electrical insulation. Furthermore, the electrical insulation of the first roller 7 may be ensured by coating not only the surface of the roller but also the outer periphery with an electrically insulating material to prevent the first roller 7 from being electrically connected to the housing 6 or other components.

[0037] On the other hand, the second roller 8 is electrically conductive to the conductive film 10 of the endless belt 9 and is connected to a high-voltage power supply 13 as shown in FIG. 3 . The second roller 8 may be formed of a conductive material such as copper, aluminum, or stainless steel, or the surface of the roll may be coated with a conductive material so that voltage from the high-voltage power supply 12 is applied to the conductive film 10 through the second roller 8. A block member 14 made of an electrically insulating material such as polyamide (nylon 6) is attached to the second roller 8. The second roller 8 is assembled to the housing 6 via the block member 14, which electrically insulates the shaft constituting the second roller 8 from the housing 6 and enables tension adjustment of the endless belt 9 between the first roller 7 and the second roller 8. Voltage can be supplied to the second roller 8, for example, by a slip ring attached to the shaft of the second roller 8.

[0038] The dust collector 2 also includes a wire electrode 15 to which a voltage is applied between the second roller 8 and the wire electrode 15. That is, when applying a voltage to the second roller 6 through the high-voltage power supply 11, the electrostatic precipitator according to this example uses the wire electrode 15 made of a linear conductor, as shown in FIG. 1 above. As a result, the positive electrode of the high-voltage power supply 12 is connected to the second roller 8, and the negative electrode of the high-voltage power supply 12 is connected to the wire electrode 15. At this time, because the electrically insulating material that forms the endless belt 9 is present between the wire electrode 15 and the electrodes 10a, 10b provided on the inner surface of the endless belt 9, the risk of discharge or the like is eliminated even when a voltage is applied from the high-voltage power supply 11.

[0039] The wire electrode 15 should be as thin as possible and be able to withstand high voltage. For example, the linear conductor forming the wire electrode 15 is preferably made of copper, nickel, or an alloy thereof. These linear conductors are preferably coated with an insulator such as silicon. A plurality of wire electrodes 15 are arranged parallel to one another at predetermined intervals in the opening on the front surface of the housing 6. The interval between the plurality of wire electrodes 15 is set to allow dust particles with ions attached to pass through, and can be set within a range of 60 mm to 80 mm, for example.

[0040] The collector 3 includes a brush (cleaning brush) 4 that scrapes off dust particles adhering to the endless belt 9 (adhering to a static elimination area of ​​the endless belt 9, which will be described later), and a collection box 5 that collects the scraped dust particles. The brush 4 may be, for example, an aluminum roll with bristles made of nylon or the like on its surface.

[0041] 4, when the endless belt 9 in the dust collector 2 rotates, the surface of the endless belt 9 at the position corresponding to electrode X (electrode 10a) is positively charged, forming a charged area, while one of the two electrodes 10a, 10b, electrode X (electrode 10a in FIG. 4), is in contact with the second roller 8. During this period, i.e., while electrode X (electrode 10a) is in contact with the second roller 8, the other electrode Y (electrode 10b in FIG. 4) is in contact with the first roller 7 without contacting the second roller 8, and the surface of the endless belt 9 at the position corresponding to electrode Y (electrode 10b) is uncharged.

[0042] Next, as the endless belt 9 rotates, the electrode X (electrode 10a) comes into contact with the first roller without contacting the second roller 8. As shown in FIG. 5, the surface of the endless belt 9 at the position corresponding to the electrode X (electrode 10a) is inclined to a neutral potential and is neutralized, becoming a neutralized area (uncharged area). Meanwhile, the electrode Y (electrode 10b) comes into contact with the second roller 8, and the surface of the endless belt 9 at the position corresponding to the electrode Y (electrode 10b) now becomes a charged area. By switching the functions of the electrodes 10a and 10b using the first roller 7 and the second roller 8 in this way, the present invention enables self-cleaning while the electrostatic precipitator is operating.

[0043] 6 is a schematic diagram illustrating how dust particles in the air are captured and collected by the electrostatic precipitator according to this embodiment. As described above, a positive DC voltage is applied to the second roller 8 by the high-voltage power supply 13. A negative DC voltage is applied to the multiple wire electrodes 15 and the electrode needles 1a of the ionizer 1. The potential difference between the electrodes is set to 3 kV or more. By applying DC voltages of the same polarity to the electrode needles 1a of the ionizer 1 and the multiple wire electrodes 15, ions generated by the ionizer 1 are dispersed by the repulsion of the same polarity caused by the wire electrodes 15.

[0044] Dust particles 16 in the air are negatively charged by ions generated by the electrode needle 1a of the ionizer 1 and are attracted to the endless belt 9 through the gaps in the wire electrode 15. Then, as shown in Figures 4 and 5, the dust particles 16 are attracted to the surface of the endless belt 9 at a position corresponding to electrode X (electrode 10a in Figure 6) of the electrodes 10a and 10b that contacts the second roller 8 to which a voltage of the opposite polarity, a positive voltage, is applied, i.e., the charged region.

[0045] Next, as shown in Fig. 7, the attracted dust particles 16 lose their electrical attraction force when the surface of the endless belt 9 to which they have been attracted becomes a charge-neutral area (non-charged area) as the endless belt 9 rotates. When the endless belt 9 further rotates and the dust particles 16 come into contact with the brush 4 of the collector 3, the dust particles 16 are scraped off by the brush 4 and collected in the collection box 5, as shown in Fig. 8. During this time, the surface of the endless belt 9 at a position corresponding to another electrode Y (electrode 10b in Figs. 7 and 8) becomes a charged area, so that other dust particles 16 continue to be attracted and collected alternately.

[0046] Dust particles accumulate in the charged area over time. As the dust particles accumulate, the adsorptive force decreases, but as the endless belt 9 rotates, the charged area becomes a charge-removing area, and the dust particles are collected. In particular, once the area becomes a charge-removing area, the electrical adsorptive force of the dust particles is almost completely eliminated, making it easy to wipe them off with a brush.

[0047] Thus, according to the present invention, by rotating the endless belt and bringing two electrodes attached to the inner surface of the endless belt into contact with the first roller and the second roller, charged areas and neutralized areas are alternately generated on the endless belt, thereby collecting dust particles in the air and recovering the dust particles captured by the endless belt, thereby enabling efficient collection of dust particles.

[0048] 1: ionizer, 2: dust collector, 3: collector, 4: brush, 5: collection box, 6: housing, 7: first roller, 8: second roller, 9: endless belt, 10: conductive film, 10a, 10b: electrodes, 11: gap, 12: rotary motor, 13: high-voltage power supply, 14: block member, 15: wire electrode, 16: dust particles.

Claims

1. An electrostatic precipitator comprising: an ionizer that generates ions from electrode needles by corona discharge to charge dust particles in the air; a dust collector having an endless belt wound around a first roller and a second roller and capturing dust particles with the endless belt; and a collector that recovers dust particles attached to the endless belt of the dust collector; the endless belt of the dust collector has a conductive film laminated on its inner surface, and the conductive film has two gaps that are discontinuous in the longitudinal direction of the endless belt, forming two electrodes; either or both of the first and second rollers of the dust collector are connected to a rotating device that rotates the endless belt; the first roller is electrically insulated from the conductive film of the endless belt; and the second roller is electrically conductive to the conductive film of the endless belt, and a voltage of opposite polarity to the polarity of the ions generated by the electrode needles of the ionizer is applied to the second roller; In the electrostatic precipitator, when the endless belt rotates in the dust collector, while one of the two electrodes, electrode X, is in contact with the second roller, the surface of the endless belt at a position corresponding to electrode X is charged to form a charged area, and then while electrode X is in contact with the first roller, the surface of the endless belt at the position corresponding to electrode X is decharged to form a de-electrified area.

2. An electrostatic precipitator according to claim 1, wherein while one of the two electrodes, electrode X, is in contact with the second roller, the other electrode, electrode Y, is in contact with the first roller but not with the second roller.

3. An electrostatic precipitator as claimed in claim 1, wherein the precipitator comprises a wire electrode with a voltage applied between it and a second roller.

4. An electrostatic precipitator as described in claim 1, wherein the collector comprises a brush for scraping off dust particles adhering to the static elimination area of ​​the endless belt, and a collection box for collecting the scraped off dust particles.

5. A method for collecting dust particles in the air using an electrostatic precipitator as defined in any one of claims 1 to 4, characterized in that an endless belt is rotated by a first roller and / or a second roller in the dust collector, and two electrodes attached to the inner surface of the endless belt are brought into contact with the first roller and the second roller, thereby generating charged areas and neutralized areas alternately on the endless belt, thereby collecting dust particles in the air and recovering the dust particles captured by the endless belt.

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