Dust collecting device and air conditioner equipped with the same

Abstract

The dust collector collects dust contained in the air passing through the air duct using a collecting plate that is charged by friction. The dust collector includes a dust charging unit, which is positioned upstream of the collecting plate in the direction of air flow. The dust charging unit generates ions and charges the dust, causing the dust to be attracted by electrostatic force and captured by the collecting plate.

Description

Technical Field

[0001] The present invention relates to a dust collecting device that generates static electricity by friction and collects dust in the air, and an air conditioner equipped with the dust collecting device. Background Art

[0002] Conventional dust collectors for capturing dust in the air utilize static electricity generated by friction (see, for example, Patent Document 1). Patent Document 1 has the following structure: A plurality of collection plates are arranged in an air passage within a housing, spaced apart from one another in a direction intersecting the direction of air flow, and a brush is inserted into the gaps between the collection plates and contacts the surface of the collection plates. The collection plates are then rotated, and dust contained in the air passing between the collection plates is captured using static electricity.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 61-227860 Summary of the Invention

[0006] Problems to be solved by the invention

[0007] In Patent Document 1, the surface of the collecting plate is rubbed with a brush, generating an electric charge on the surface of the collecting plate. Dust contained in the air flowing into the air duct is divided into dust that is attracted by the collecting plate due to electrostatic forces, and dust that is not captured due to electrostatic forces due to repulsion. Consequently, there is a problem: the collection performance is easily fluctuated and unstable depending on the charge state of the dust when it flows into the air duct.

[0008] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a dust collecting device and an air conditioner equipped with the dust collecting device that can stably obtain high collection performance regardless of the charge state of dust when flowing into an air duct.

[0009] Means for solving problems

[0010] The dust collecting device of the present invention is a dust collecting device that collects dust contained in the air passing through an air path using a collecting plate that is charged by friction. The device is provided with a dust charging portion that is arranged on the upstream side of the collecting plate in the direction of air passage, generates ions and charges the dust so that the dust is attracted by the electrostatic force and is collected by the collecting plate.

[0011] Effects of the Invention

[0012] According to the present invention, the dust is charged so that the dust is attracted by electrostatic force and is collected by the collecting plates. Therefore, the amount of dust not adsorbed by the collecting plates is reduced, and high collection performance can be stably obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a diagram schematically showing an air conditioner equipped with the dust collecting device according to the first embodiment.

[0014] Figure 2 This is a perspective view of the dust collecting tool according to the first embodiment.

[0015] Figure 3 This is a perspective view of the brush included in the dust collecting tool according to the first embodiment.

[0016] Figure 4 This is a longitudinal sectional view schematically showing the dust collecting tool according to the first embodiment.

[0017] Figure 5 This is a longitudinal sectional view schematically showing a first modified example of the dust collecting tool according to the first embodiment.

[0018] Figure 6 This is a longitudinal sectional view schematically showing a second modified example of the dust collecting tool according to the first embodiment.

[0019] Figure 7 This is a perspective view of a dust collecting tool according to a second embodiment.

[0020] Figure 8 This is a longitudinal sectional view schematically showing the dust collecting tool according to the second embodiment.

[0021] Figure 9 This is a schematic cross-sectional view of a structure in which the ion removal electrode included in the dust collecting tool according to the second embodiment is directly connected to the ground.

[0022] Figure 10 This is a schematic cross-sectional view of a structure in which an ion removal electrode included in a dust collecting tool according to a second embodiment is grounded via a DC power supply.

[0023] Figure 11 This is a longitudinal sectional view schematically showing a dust collecting tool according to a third embodiment.

[0024] Figure 12 This is a diagram showing a state of the dust collecting device according to the third embodiment during the dust collecting operation.

[0025] Figure 13 This is a diagram showing a state of the dust collecting tool according to the third embodiment during frictional charging operation. DETAILED DESCRIPTION

[0026] Hereinafter, with reference to the accompanying drawings, etc., the dust collecting device and the air conditioner of the embodiment will be described. In the following drawings, the parts marked with the same figure mark are the same or equivalent parts, and are shared in the full text of the embodiment described below. Moreover, the forms of the constituent elements shown in the full text of the specification are only examples and are not limited to the forms described in the specification. In particular, the combination of constituent elements is not limited to the combination in each embodiment, but the constituent elements described in other embodiments can be applied to other embodiments. In addition, in the following description, the upper side in the figure is set as the "upper side" and the lower side is set as the "lower side" and described. Moreover, for ease of understanding, terms indicating directions, such as "right", "left", "front", "rear", etc., are appropriately used, but they are used for explanation and are not limited by these terms. Moreover, in the drawings, the size relationship of each constituent member is sometimes different from the actual one.

[0027] Implementation method 1.

[0028] Here, refer to Figures 1 to 4 The dust collecting device and the air conditioner equipped with the dust collecting device according to the first embodiment will be described. Figure 1 1 is a diagram showing an outline of an air conditioner equipped with the dust collecting device of embodiment 1. Figure 1 The hollow arrows shown in the drawings described below indicate the flow of air.

[0029] exist Figure 1 In the embodiment, an outdoor air supply port 21 and an outdoor air exhaust port 22 are provided on the outdoor wall surface. In addition, an indoor air supply port 23 and an indoor air exhaust port 24 are provided on the indoor side of the sunken ceiling 20. Moreover, an air supply duct 30 and an exhaust duct 40 are formed in the sunken ceiling 20. The air supply duct 30 is an air duct that takes outdoor air from the outdoor air supply port 21 into the sunken ceiling 20 and supplies air to the room from the indoor air supply port 23. The exhaust duct 40 is an air duct that takes indoor air from the indoor exhaust port 24 into the sunken ceiling 20 and exhausts it to the outside from the outdoor exhaust port 22.

[0030] Furthermore, the dust collector 1 and the heat exchange ventilator 10 are arranged in order from the upstream side in the supply air duct 30. Furthermore, the heat exchange ventilator 10 is arranged in the exhaust air duct 40. In the supply air duct 30, the outdoor air supply port 21 and the indoor air supply port 23 are connected by a duct 31 via the dust collector 1 and the heat exchange ventilator 10. Furthermore, in the exhaust air duct 40, the indoor exhaust port 24 and the outdoor exhaust port 22 are connected by a duct 41 via the heat exchange ventilator 10.

[0031] The heat exchange ventilator 10 is a ventilator that has both ventilation and air conditioning auxiliary functions. The ventilation function refers to the ability to supply outdoor air into the room and exhaust indoor air to the outside. To achieve this ventilation function, the heat exchange ventilator 10 includes a fan (not shown) that blows air from the outside into the room through the supply air duct 30 and a fan (not shown) that blows air from the room into the room through the exhaust air duct 40.

[0032] The air conditioning assist function is a function that assists the air conditioning operation of equipment such as air conditioners that adjust the indoor temperature by recovering heat from the exhaust indoor air and supplying the recovered heat to the supply air. Because the air conditioning assist function reduces the energy burden on the equipment, it can also be considered an energy-saving function. To implement this air conditioning assist function, the heat exchange ventilator 10 includes a heat exchanger (not shown) that exchanges heat between air passing through the exhaust air duct 40 and air passing through the supply air duct 30.

[0033] The dust collecting device 1 is a device that collects dust 5 in the outdoor air flowing into the sunken ceiling 20 from the outdoor air supply port 21. The dust collecting device 1 according to the first embodiment will be described in detail below.

[0034] Figure 2 This is a perspective view of the dust collecting tool according to the first embodiment. Figure 3 This is a perspective view of the brush included in the dust collecting tool according to the first embodiment. Figure 4 This is a longitudinal sectional view schematically showing the dust collecting tool according to the first embodiment.

[0035] The dust collecting device 1 includes a dust collecting unit 1A and a dust charging unit 1B disposed upstream of the dust collecting unit 1A. An air passage 16 is formed in the dust collecting unit 1, allowing air to flow sequentially through the dust charging unit 1B and the dust collecting unit 1A. The dust collecting unit 1A comprises a frame 15A housing a plurality of rotatable collecting plates 2, a collecting plate charging unit 3, and a dust box 4. The dust charging unit 1B also houses an ion generating component 51 within the frame 15B.

[0036] (Dust collecting unit 1A)

[0037] The frame 15A has an inlet 14a and an outlet 14b. An air passage 16A is formed in the frame 15A to discharge the air sucked from the inlet 14a through the outlet 14b. The air passage 16A constitutes the downstream side of the air passage 16. Figure 1 As shown, the dust collecting device 1 is installed in the air supply duct 30 of the air conditioner. Therefore, the outdoor air flowing in from the outdoor air supply port 21 passes through the dust collecting device 1.

[0038] The collecting plate 2 is, for example, a circular plastic plate made of PP (Poly Propylene) with a thickness of 1 mm and a diameter of 300 mm, exhibiting a negative triboelectric charge tendency. However, the material of the collecting plate 2 is not limited to PP; for example, resin materials such as polyvinyl chloride or Teflon (registered trademark) may also be used. Multiple collecting plates 2 are arranged in a direction intersecting the flow of outdoor air through the frame 15A, spaced apart at intervals of, for example, 3 mm. A hole is formed in the center of the collecting plate 2 for the passage of the quadrangular prism portion of the first shaft 8, and the first shaft 8 extends through this hole.

[0039] The collecting plate charging part 3 has a plurality of brushes 3a arranged in parallel. The brushes 3a rub the surface of the collecting plate 2 to charge the surface of the collecting plate 2 with static electricity and to remove the dust 5 collected by the collecting plate 2. Figure 3 As shown, the brush 3a has a structure in which a non-woven fabric 3ab made of, for example, PA6 (Polyamide 6: nylon 6) fibers having a positive triboelectric tendency is attached to a rectangular support plate 3aa of aluminum with a thickness of 1 mm. The non-woven fabric 3ab is a flexible friction body. However, the material of the non-woven fabric 3ab is not limited to PA6, and it can be, for example, nylon or cotton. The fibers of the non-woven fabric 3ab are preferably mixed with carbon, metal, or the like to have conductivity. In addition, two mounting holes 3ac are provided in the support plate 3aa of the brush 3a, and the second shaft 9 is inserted into each mounting hole 3ac to connect the brushes 3a.

[0040] While the example shown here shows a negatively charged collector plate 2, it can also be positively charged. To achieve this, the collector plate 2 can be made of PA6 or the nonwoven fabric 3ab of the brush 3a can be made of PTFE (Poly Tetra Fluoro Ethylene), which has a strong negative charge tendency.

[0041] The brushes 3a are inserted into the gaps between the collecting plates 2 so that the nonwoven fabric 3ab contacts the surface of the collecting plates 2 and are positioned on the downstream side of the collecting plates 2. Furthermore, the brushes 3a are positioned between the collecting plates 2 in a manner aligned with the direction of passage of outdoor air, thereby reducing the ventilation resistance to the outdoor air passing through the frame 15A. In the dust collecting device 1 of Embodiment 1, the brushes 3a are positioned horizontally. This arrangement of the brushes 3a is effective in reducing ventilation resistance. Furthermore, each brush 3a is grounded. The brushes 3a are configured such that, by contacting a portion of the collecting plates 2 and the collecting plates 2 rotating, the brushes 3a move relative to the collecting plates 2 and come into contact with the entirety of the collecting plates 2.

[0042] The brush 3a may be in a nonwoven fabric shape or may be in a bristle brush, sponge, or plate shape. While the brush 3a is shown as being positioned downstream of the first axis 8 of the collecting plate 2, it may also be positioned upstream of the first axis 8 of the collecting plate 2. When the brush 3a is positioned upstream of the first axis 8, the dust box 4 may also be positioned upstream of the first axis 8 and below the brush 3a.

[0043] A dust box 4 is provided below the brush 3a in the housing 15A to collect aggregates 17 of dust and the like adhering to the collecting plate 2. The aggregates 17 adhering to the collecting plate 2 are brushed off by the brush 3a and collected in the dust box 4.

[0044] In addition, a first baffle member 18 and a second baffle member 19 are arranged in the frame 15A in a manner that they face each other from top to bottom, sandwiching the collecting plate 2. The first baffle member 18 and the second baffle member 19 are configured to rectify the outdoor air that has passed through the dust charging section 1B and flowed into the dust collecting section 1A so as to pass through the collecting plate 2. The first baffle member 18 has a curved surface shape along the outer peripheral surface of the collecting plate 2. The second baffle member 19 has a flat surface shape. In addition, the shapes of the first baffle member 18 and the second baffle member 19 are not limited to any shapes as long as they rectify the air flow through the center portion of the collecting plate 2. Figure 2 The shape shown.

[0045] In addition, the outside of the frame 15A is provided with a motor 6 and a control unit 7 that controls the dust collecting device 1 as a whole. The control unit 7 includes a drive control unit (not shown) that controls the motor 6. The control unit 7 is composed of, for example, a microprocessor unit. In addition, the structure of the control unit 7 is not limited thereto. For example, the control unit 7 can be composed of components that can be updated, such as firmware. In addition, the control unit 7 can also be a program module that is executed according to instructions from a CPU, etc., not shown.

[0046] The motor 6 is connected to the first shaft 8 via a gear (not shown), and the first shaft 8 rotates due to the rotation of the motor 6 .

[0047] (Dust charging part)

[0048] The dust charging unit 1B is a part that charges the dust 5 by generating ions. It has a structure in which an ion generating component 51 is housed within a frame 15B. The frame 15B has an intake port 14c and an exhaust port 14d. An air passage 16B is formed within the frame 15B, through which air drawn in from the intake port 14c is discharged from the exhaust port 14d. The air passage 16B constitutes the upstream side of the air passage 16.

[0049] The ion generating component 51 generates ions for charging the dust 5 flowing into the frame 15B from the suction port 14c. The ion generating component 51 can generate a certain amount of ions per unit time, or it can vary the amount of ions generated. In this first embodiment, it is assumed that it generates a certain amount of ions and is described. In one example, the ion generating component 51 generates ions of a polarity opposite to the charged polarity of the surface of the collecting plate 2, and charges the dust 5 to a polarity opposite to the charged polarity of the surface of the collecting plate 2. In other words, in this first embodiment, since the collecting plate 2 is made of a material with a negative triboelectric charge tendency, the dust 5 is charged to a positive polarity by generating positive ions 52a using the ion generating component 51 and supplying the positive ions 52a to the dust 5. This structure is preferred when considering dust collection performance, etc.

[0050] like Figure 4 As shown, the ion generating component 51 includes a fibrous electrode 51a made of a conductive fibrous material and a high-voltage power supply 51b connected to the fibrous electrode 51a. The fibrous electrode 51a has a structure in which a plurality of fibrous materials extending in the vertical direction are bundled at the center portion in the vertical direction and is arranged on the central axis of the dust collecting device 1.

[0051] The high voltage supplied from the high voltage power supply 51b causes corona discharge at the tip of the fiber electrode 51a, generating positive ions 52a. The positive ions 52a are then supplied to the dust 5, thereby forming positively charged dust 53.

[0052] Since the corona discharge generated from the front end of the fibrous electrode 51a is a tiny discharge, the discharge power can be suppressed to a minimum. Therefore, the fibrous electrode 51a can suppress the amount of byproducts such as ozone and NOx produced by the corona discharge. In addition to this, there are needle-shaped electrodes, for example, as electrodes that generate ions, but needle-shaped electrodes produce more byproducts. Therefore, in this first embodiment, by using the fibrous electrode 51a as an electrode that generates ions, the amount of byproducts such as ozone and NOx produced by the corona discharge can be suppressed, and the dust 5 can be efficiently charged. In addition, when the frame 15B is formed of a conductor and grounded, or a grounded component is provided in the air duct 16B, corona discharge at the front end of the fibrous electrode 51a is easily generated, and the discharge is also relatively stable.

[0053] Alternatively, an operating mode can be set in which ozone is intentionally generated by the fiber-shaped electrode 51a to sterilize and deodorize the downstream side of the ion generating component 51. In this case, the downstream side of the ion generating component 51 can be kept clean. To intentionally generate ozone, the power of the corona discharge at the tip of the fiber-shaped electrode 51a can be increased compared to the power used to charge the dust 5 for collecting the dust 5.

[0054] The structure of the fiber electrode 51a is not limited to the illustrated structure. For example, the fiber electrode 51a may be configured such that one end portion of each of a plurality of fibrous materials arranged in parallel is supported by a supporting member.

[0055] In addition, the arrangement position of the fiber-shaped electrode 51a is not limited to the exemplified position. Figure 4 In the embodiment, the fiber-shaped electrodes 51a are arranged upright, and both ends of the fiber-shaped electrodes 51a are arranged toward the upper surface 15a side and the lower surface 15b side of the frame body 15B. Figure 2 The fiber-shaped electrodes 51a are arranged in a horizontal direction. Figure 4 In the embodiment, the fibrous electrode 51a is arranged on the central axis of the dust collecting device 1, but it can also be arranged on the upper surface 15a or lower surface 15b of the frame 15B. Specifically, for example, the fibrous electrode 51a can be configured as a structure in which a supporting member supports one end of a plurality of fibrous raw materials arranged in parallel, and the supporting member is provided on the upper surface 15a of the frame 15B and arranged so that the other end of the plurality of fibrous raw materials faces the lower surface 15b of the frame 15B. Alternatively, the fibrous electrode 51a can be configured as a structure in which a supporting member supports one end of a plurality of fibrous raw materials arranged in parallel, and the supporting member is provided on the lower surface 15b of the frame 15B and arranged so that the other end of the plurality of fibrous raw materials faces the upper surface 15a of the frame 15B.

[0056] The operation of the dust collecting device 1 configured as described above will be described.

[0057] In the dust collecting device 1, the dust collecting operation is first performed. The dust collecting operation is an operation in which the surface of the collecting plate 2 is charged with static electricity and dust 5 in the air is collected on the collecting plate 2. In the dust collecting operation, the control unit 7 drives the motor 6 to rotate the first shaft 8, and the collecting plate 2 fixed to the first shaft 8 is rotated. Figure 2 Specifically, the control unit 7 rotates the collecting plate 2 for several seconds. Then, after the collecting plate 2 stops rotating, the control unit 7 turns on the high-voltage power supply 51b, and the ion generating component 51 generates positive ions 52a.

[0058] As described above, the brush 3a that constitutes the collecting plate charging portion 3 contacts a portion of the collecting plate 2. Therefore, when the collecting plate 2 rotates, the collecting plate 2 moves relative to the brush 3a, and the brush 3a contacts and rubs the entire collecting plate 2. This friction causes static electricity to be charged on the surface of the collecting plate 2. Then, after the collecting plate 2 stops rotating, outdoor air is drawn into the dust collecting device 1. After passing through the dust charging portion 1B, the air drawn into the dust collecting device 1 is rectified by the first baffle member 18 and the second baffle member 19 and passes through the center portion between the collecting plates 2.

[0059] Here, when dust 5 contained in the air passes through the dust charging section 1B, it is charged to a positive polarity opposite to the charging polarity of the collecting plates 2 by positive ions 52a generated by the ion generating member 51. When the positively charged dust 53 passes between the collecting plates 2, it is attracted to the collecting plates 2 due to the electrostatic force of attraction acting between the dust 53 and the collecting plates 2.

[0060] By using ion generating component 51 to generate positive ions 52a, a large amount of dust 5 contained in the air can be forcibly charged to a positive polarity. Consequently, compared to a case where ion generating component 51 is not used, the electrostatic force adsorbed on collecting plate 2 can be applied to a larger amount of dust 5 in the air. As a result, the amount of dust 5 not adsorbed by collecting plate 2 can be reduced, thereby improving the capture rate and achieving consistently high capture performance regardless of the charge state of the dust 15 when it enters air duct 16.

[0061] After the above dust collection operation, the friction charging operation is performed. The friction charging operation is to use the brush 3a to brush off the dust 5 collected by the collecting plate 2 to clean the collecting plate 2 and recharge the collecting plate 2. In the friction charging operation, the control unit 7 drives the motor 6 and makes the collecting plate 2, for example, Figure 2 The collecting plate 2 is rotated as shown by the arrow for several minutes. Furthermore, the control unit 7 turns off the high-voltage power supply 51b to stop the generation of positive ions 52a from the ion generating component 51. By rotating the collecting plate 2, the surface of the collecting plate 2 rubs against the brush 3a, so that the dust 5 attached to the surface of the collecting plate 2 is collected by the brush 3a, and the collecting plate 2 is frictionally charged. Then, as the collecting plate 2 rotates, part of the dust 5 collected by the brush 3a becomes aggregates 17 and adheres to the lower portion of the brush 3a. When the aggregates 17 reach a certain size or larger, they fall due to gravity and are recovered in the dust box 4 provided at the lower portion of the brush 3a.

[0062] With the above-described configuration, it is possible to realize a dust collecting device that can reduce the dust 5 discharged from the dust collecting device 1 without being adsorbed by the collecting plate 2 and can stably achieve high collecting performance.

[0063] Here, an example is shown in which the dust particles 5 are charged to a positive polarity using positive ions 52a because the collecting plate 2 has a negative triboelectric tendency. However, if the collecting plate 2 has a positive triboelectric tendency, the ion generating unit 51 can generate negative ions 52b to charge the dust particles 5 to a negative polarity. Furthermore, the polarity of the ions generated by the ion generating unit 51 is not limited to being opposite to the charged polarity of the collecting plate 2; it can be set to match the charged state of the surface of the collecting plate 2. For example, if the charged polarity of the surface of the collecting plate 2 is uneven, with both positive and negative polarity, both positive ions 52a and negative ions 52b can be generated to charge the dust particles in the air to either positive or negative polarity. Furthermore, if the charged polarity of the surface of the collecting plate 2 is uneven, with both positive and negative polarity, the ion generating unit 51 can generate positive ions 52a to charge the dust particles 5 to a positive polarity, or it can generate negative ions 52b to charge the dust particles 5 to a negative polarity. The charged polarity of the surface of the collecting plate 2 can be determined by, for example, measuring it with a surface potentiometer.

[0064] While this example illustrates a plurality of collecting plates 2 all charged to the same polarity, each collecting plate 2 can also be charged with a different polarity. Specifically, a configuration can be employed in which both positively charged collecting plates 2 and negatively charged collecting plates 2 coexist. In this configuration, both positive ions 52a and negative ions 52b are generated by the dust charging unit 1B. Consequently, positively charged dust 5 is captured by the negatively charged collecting plates 2, while negatively charged dust 5 is captured by the positively charged collecting plates.

[0065] Although not shown, if an air filter is provided at the rear stage of the dust collecting device 1 , even the dust 5 having a relatively small particle size can be collected.

[0066] In the first embodiment, a case where the first shaft 8 is composed of one piece is described, but a structure in which a plurality of first shafts are connected in the axial direction may also be employed.

[0067] In the first embodiment, the dust collecting unit 1A and the dust charging unit 1B are configured to be formed in separate housings. However, they may be configured to be formed together in one housing.

[0068] -First Modification of the Embodiment-

[0069] Figure 5 This is a longitudinal sectional view schematically showing a first modified example of the dust collecting tool according to the first embodiment.

[0070] The ion generating component 51 of the dust charging unit 1B in the dust collecting device 1 of this modified example 1 includes a soft X-ray ionizer 51c that generates ions using soft X-rays. The soft X-ray ionizer 51c is controlled by an ionizer control unit 51d. The ionizer control unit 51d is controlled by the control unit 7. The soft X-ray ionizer 51c can ionize air without generating ozone or NOx. Under the control of the ionizer control unit 51d, the soft X-ray ionizer 51c irradiates the air flowing into the housing 15B with soft X-rays. This ionizes the air. The generated ions charge the dust 5.

[0071] In addition, Figure 5 , the following example is shown: two soft X-ray ionizers 51c are arranged on the upper surface 15a and lower surface 15b of the housing 15B, and are arranged to irradiate ions in mutually opposing directions. However, the number and arrangement positions of the soft X-ray ionizers 51c are not limited to the number and arrangement positions shown. For example, a configuration may be provided in which one soft X-ray ionizer 51c is arranged on either the upper surface 15a or the lower surface 15b of the housing 15B. Alternatively, the two soft X-ray ionizers 51c may be arranged on the central axis of the dust collector 1 so that they irradiate ions in mutually opposing directions.

[0072] -Second Modification of the Embodiment-

[0073] Figure 6 This is a longitudinal sectional view schematically showing a second modified example of the dust collecting tool according to the first embodiment.

[0074] The ion generating component 51 of the dust charging unit 1B in the dust collecting device 1 of this second modification generates ions using the photoelectric effect and includes an ultraviolet light source 51e and a photoelectronic material 51g. The ultraviolet light source 51e is controlled by a light source control unit 51f. The light source control unit 51f is controlled by the control unit 7. Similar to the soft X-ray ionizer 51c, the ion generating component 51 using the photoelectric effect can ionize air without generating ozone or NOx. While the soft X-ray ionizer 51c requires declaration upon use, the ion generating component 51 using the photoelectric effect does not require declaration, making it easier to use than the soft X-ray ionizer 51c.

[0075] Ultraviolet light sources 51e are located on the upper surface 15a and lower surface 15b of the housing 15B. A photoelectronic material 51g is plate-shaped and positioned on the central axis of the dust collector 1, with its surface facing the irradiation surface of the ultraviolet light source 51e. The ultraviolet light source 51e irradiates the photoelectronic material 51g with ultraviolet light under the control of a light source control unit 51f. The photoelectric effect associated with ultraviolet irradiation generates photoelectrons on the surface of the photoelectronic material 51g, which are then used to ionize the air flowing into the housing 15B. The generated ions charge the dust particles 5.

[0076] Furthermore, the number and placement of the ultraviolet light sources 51e and optoelectronic materials 51g are not limited to the illustrated positions. For example, the ultraviolet light sources 51e may be positioned only on the upper surface 15a of the housing 15B, while the optoelectronic materials 51g may be positioned on the lower surface 15b of the housing 15B so as to face the irradiation surface of the ultraviolet light sources 51e. Alternatively, the ultraviolet light sources 51e may be positioned only on the lower surface 15b of the housing 15B, while the optoelectronic materials 51g may be positioned on the upper surface 15a of the housing 15B so as to face the irradiation surface of the ultraviolet light sources 51e.

[0077] As described above, the dust collecting device 1 of the first embodiment is a dust collecting device that uses a collecting plate 2 that is charged by friction to collect dust 5 contained in the air passing through the air duct 16. The dust collecting device 1 includes a dust charging unit 1B that is arranged upstream of the collecting plate 2 in the direction of air flow. The dust charging unit 1B generates ions and charges the dust 5, causing the dust 5 to be attracted by electrostatic force and be captured by the collecting plate 2.

[0078] In this way, by using the dust charging unit 1B to forcibly charge the dust 5 contained in the air, so that it is attracted by the electrostatic force and captured by the collecting plate 2, the dust 5 not adsorbed by the collecting plate 2 can be reduced, and a high collection performance can be stably obtained.

[0079] The dust charging unit 1B includes one of a "fibrous electrode 51a," a "soft X-ray ionizer 51c," and an "ultraviolet light source 51e and photoelectronic material 51g." When the dust charging unit 1B includes the fibrous electrode 51a, the generation of byproducts such as ozone and NOx produced by corona discharge can be suppressed, while efficiently charging the dust 5. When the dust charging unit 1B includes the soft X-ray ionizer 51c, the dust 5 can be efficiently charged without generating ozone, NOx, etc. When the dust charging unit 1B includes the ultraviolet light source 51e and photoelectronic material 51g, the dust 5 can be efficiently charged without generating ozone, NOx, etc. using components that are easier to handle than soft X-rays. Furthermore, when the dust charging unit 1B includes the fibrous electrode 51a, the portion of the dust collecting device 1 where the dust 5 is collected can be kept clean while ozone is generated.

[0080] The dust charging unit 1B charges the dust 5 to a polarity opposite to the charging polarity of the collecting plate 2 .

[0081] In this way, by using the dust charging unit 1B to forcibly charge the dust 5 contained in the air to a polarity opposite to the charging polarity of the collecting plate 2, the dust 5 not adsorbed by the collecting plate 2 can be reduced, and a high collection performance can be stably obtained. In addition, the charging polarity of the collecting plate 2 mentioned here refers to the main charging polarity of the collecting plate 2. In other words, the charging polarity of the collecting plate 2 refers to the polarity determined based on the charging tendency of the raw material used as the material of the collecting plate 2. The surface of the collecting plate 2 after the collecting plate 2 is frictionally charged by the brush 3a is not limited to the case where the main charging polarity of the collecting plate 2 is uniformly charged, and it can also be a case where a positive polarity portion and a negative polarity portion coexist. Even if they coexist in this way, the charging polarity of the collecting plate 2 refers only to the main charging polarity of the collecting plate 2.

[0082] The dust collecting device 1 of the first embodiment includes a brush 3a arranged to contact the surface of the collecting plate 2, and a motor 6 for rotating the collecting plate 2. The dust collecting device 1 further includes a control unit 7 that performs a friction charging operation. In this friction charging operation, the control unit 7 controls the motor 6 to rotate the collecting plate 2, and the brush 3a is used to brush off dust 5 captured by the collecting plate 2 to clean the collecting plate 2. The brush 3a also charges the collecting plate 2 through friction with the brush 3a.

[0083] In this manner, the collection plate 2 can be charged by utilizing the friction between the rotation of the collection plate 2 and the brush 3 a , and the collection plate 2 can be cleaned at the same time.

[0084] Implementation method 2.

[0085] The dust collecting device 100 of the second embodiment basically has the same structure as the dust collecting device 1 of the first embodiment, but differs in that it includes an ion removal electrode 54. The following description focuses on the differences between the second embodiment and the first embodiment, and the structures not described in the second embodiment are the same as those in the first embodiment.

[0086] Figure 7 This is a perspective view of a dust collecting tool according to a second embodiment. Figure 8 This is a longitudinal sectional view schematically showing the dust collecting tool according to the second embodiment. Figure 9 This is a schematic cross-sectional view of a structure in which the ion removal electrode included in the dust collecting tool according to the second embodiment is directly connected to the ground. Figure 10 This is a schematic cross-sectional view of a structure in which an ion removal electrode included in a dust collecting tool according to a second embodiment is grounded via a DC power supply.

[0087] like Figure 7As shown, the dust collecting device 100 of the second embodiment is provided with an ion removal electrode 54 between the dust charging section 1B and the collecting plate 2, specifically, at the suction port 14a of the dust collecting section 1A. The ion removal electrode 54 is made of a conductive material. The ion removal electrode 54 is, for example, a mesh-shaped metal plate. The ion removal electrode 54 is arranged in the air duct 16 in such a manner that the charged dust 53 passes through the opening 54a of the mesh of the metal plate. Figure 9 As shown, the ion removal electrode 54 is directly connected to ground and maintained at ground potential. Figure 10 As shown, ion removal electrode 54 is grounded via DC power supply 55. In this case, a DC voltage of a negative polarity, which is the same as the charged polarity of collecting plate 2, is applied from DC power supply 55 to ion removal electrode 54, thereby maintaining ion removal electrode 54 at a potential of the same negative polarity as the charged potential of collecting plate 2. As described above, the charged polarity of collecting plate 2 refers to the primary polarity.

[0088] If positive ions 52a in the air pass directly between the collecting plates 2 without being adsorbed by the dust 5, there is a possibility that the collecting plates 2 will be de-electrified by the positive ions 52a. Therefore, in this second embodiment, the positive ions 52a that flow into the collecting plates 2 are removed using the ion removal electrodes 54 during the dust collection operation, thereby preventing the collecting plates 2 from being de-electrified.

[0089] Next, the function of the ion removal electrode 54 will be described. Figure 9 The ion removal electrode 54 connected to the ground as shown in FIG. Figure 10 An electric field is formed between the ion removal electrodes 54" having a potential with a polarity opposite to their own. Therefore, when the positive ions 52a or charged dust 53 in the air flowing in the air path 16 pass near the ion removal electrode 54, they are subjected to the electrostatic force from the electric field and are pulled toward the ion removal electrode 54. At this time, since the charged dust 53, which has a larger mass than the positive ions 52a, has a greater inertia in the direction of passage of the air than the positive ions 52a, even if it is pulled toward the ion removal electrode 54, it will flow toward the downstream side of the ion removal electrode 54 through the opening 54a of the ion removal electrode 54.

[0090] However, positive ions 52a having an inertia much smaller than that of charged dust 53 are drawn toward ion removal electrode 54 and flow into ion removal electrode 54. This removes positive ions 52a from the air and prevents collection plate 2 from being de-electrified by positive ions 52a.

[0091] Figure 10 The ion removal electrode 54 shown is maintained at a negative potential equal to the charge potential of the collecting plate 2 by applying a negative DC voltage equal to the charge polarity of the collecting plate 2 from the DC power supply 55 as described above. Figure 9 Compared to the ion removal electrode 54 shown, it can more reliably remove positive ions 52a of a polarity opposite to the charged polarity of the collecting plate 2 and reliably prevent the collecting plate 2 from being de-charged. Furthermore, when a DC voltage is applied, the applied DC voltage may be ±500 V or less, and more preferably ±100 V or less.

[0092] Here, as the thickness d of the ion removal electrode 54 in the direction in which air passes increases, charged dust 53 is easily drawn toward the ion removal electrode 54, preventing it from passing through the opening 54a and adhering to the ion removal electrode 54, thereby contaminating the ion removal electrode 54. Therefore, the thickness d of the ion removal electrode 54 is set to a thickness range that does not attract charged dust 53. In other words, the thickness d of the ion removal electrode 54 is set to a thickness that allows charged dust 53 to pass through the opening 54a without being attracted to and adhering to the inner circumferential surface 54aa of the opening 54a. This eliminates the possibility of charged dust 53 contaminating the ion removal electrode 54 and eliminates the need for maintenance of the ion removal electrode 54.

[0093] As described above, according to the second embodiment, the same effects as those of the first embodiment can be obtained, and the following effects can also be obtained. Specifically, the dust collecting device 100 of the second embodiment includes the ion removal electrode 54 disposed between the dust charging portion 1B and the collecting plate 2 and allowing ions of a polarity opposite to that of the charging polarity of the collecting plate 2 to flow in.

[0094] Thus, the ion removal electrodes 54 can remove ions of polarity opposite to the charge polarity of the collecting plate 2 that do not contribute to dust charging. Therefore, the collecting plate 2 can be prevented from being de-charged by ions of polarity opposite to the charge polarity of the collecting plate 2, and a high and stable collection performance can be achieved.

[0095] Ion removal electrode 54 is maintained at ground potential or a potential having the same polarity as the charged potential of collecting plate 2 .

[0096] By thus maintaining ion removal electrode 54 at ground potential or at a potential having the same polarity as the charged potential of collecting plate 2, ions having a polarity opposite to that of the charged polarity of collecting plate 2 can be removed. When ion removal electrode 54 is maintained at a potential having the same polarity as that of collecting plate 2, ions having a polarity opposite to that of the charged polarity of collecting plate 2 can be removed more reliably.

[0097] The ion removal electrode 54 comprises a meshed metal plate and is arranged within the air duct 16 so that dust 5 can pass through the meshed openings 54a. The thickness of the metal plate in the air flow direction is set so that dust 5 charged by the dust charging unit 1B passes through the openings 54a without being attracted to the inner peripheral surface 54aa of the openings 54a of the metal plate.

[0098] This can suppress the adhesion of dust to the ion removal electrode 54 , making maintenance unnecessary.

[0099] Implementation method 3.

[0100] The dust collecting device 200 of Embodiment 3 basically has the same structure as the dust collecting devices of Embodiments 1 and 2, but differs in that it also includes an environment detection unit 11 and an ion generation amount accumulation unit 51h. The following description focuses on the differences between Embodiment 3 and Embodiments 1 and 2. The structures not described in Embodiment 3 are the same as those in Embodiments 1 and 2.

[0101] Figure 11 This is a longitudinal sectional view schematically showing a dust collecting tool according to a third embodiment.

[0102] like Figure 11 As shown, the dust collecting device 200 of the third embodiment is Figure 2 The dust collecting tool 1 of the illustrated embodiment 1 further includes an ion removal electrode 54 , an environment detection unit 11 , and an ion generation amount integrating unit 51 h .

[0103] The environment detection unit 11 detects the air environment within the air duct 16 and includes a dust concentration detection unit 12 and a humidity detection unit 13. The dust concentration detection unit 12 detects the dust concentration within the air duct 16. The dust concentration detection unit 12 includes an upstream dust concentration detection unit 12a, which detects the dust concentration upstream of the collection plate 2 within the air duct 16, and a downstream dust concentration detection unit 12b, which detects the dust concentration downstream of the collection plate 2 within the air duct 16. The upstream dust concentration detection unit 12a is located near the intake port 14c of the dust charging unit 1B. The downstream dust concentration detection unit 12b is located near the exhaust port 14b downstream of the collection plate 2. The upstream dust concentration detection unit 12a and the downstream dust concentration detection unit 12b are composed of dust concentration sensors. The upstream dust concentration detection unit 12a detects the dust concentration of the air flowing into the dust collection device 200. The downstream dust concentration detection unit 12 b detects the dust concentration of the air exhausted from the dust collecting device 200 .

[0104] The humidity detection unit 13 is composed of a humidity sensor and is provided near the suction port 14 a on the upstream side of the dust charging unit 1B to detect the humidity of the air flowing into the dust collecting device 200 .

[0105] The ion generation amount integrating unit 51h integrates the ion generation amount per unit time in the dust charging unit 1B and calculates the total ion generation amount. The ion generation amount integrating unit 51h is functionally configured by the control unit 7. That is, the ion generation amount integrating unit 51h is provided in the control unit 7.

[0106] Control unit 7 (see Figure 2 ) The amount of ions generated by the dust charging unit 1B is controlled based on the detection results of the dust concentration detection unit 12 and the humidity detection unit 13. In addition, the control unit 7 controls the timing of the friction charging operation based on the calculation results of the ion generation amount integration unit 51h.

[0107] Next, the control of the amount of ion generation based on the detection results of the dust concentration detection unit 12 and the humidity detection unit 13 will be described. When the control unit 7 determines that the air flowing into the air duct 16 has a high degree of pollution based on the dust concentration detected by the upstream dust concentration detection unit 12a, it increases the amount of ions generated by the dust charging unit 1B to improve the efficiency of charging the dust 5. Specifically, when the dust concentration detected by the upstream dust concentration detection unit 12a is above a predetermined set concentration, the control unit 7 determines that the air has a high degree of pollution and increases the amount of ions generated by the dust charging unit 1B. This ensures that even when highly polluted air flows into the dust collection device 200, a high level of collection performance can be consistently achieved.

[0108] Furthermore, when the dust concentration detected by the upstream dust concentration detector 12a is lower than a set concentration, the controller 7 determines that the pollution level of the incoming air is low and reduces the amount of ions generated by the dust charging unit 1B or shuts down the dust charging unit 1B. This can suppress the amount of power consumed by the dust charging unit 1B.

[0109] Furthermore, if the collection performance of the dust collector 200 decreases, the control unit 7 increases the amount of ions generated by the dust charging unit 1B to improve the efficiency of charging the dust 5 and restore the decreased collection performance. Specifically, if the difference between the dust concentration of the inflowing air detected by the upstream dust concentration detection unit 12a and the dust concentration of the outflowing air detected by the downstream dust concentration detection unit 12b is lower than a preset set concentration difference, the control unit 7 determines that the collection performance of the dust collector 200 has decreased and increases the amount of ions generated by the dust charging unit 1B. This automatically maintains a constant collection performance.

[0110] In addition, when the humidity of the inflowing air detected by the humidity detection unit 13 is above the preset set humidity, the control unit 7 increases the amount of ions generated in the dust charging unit 1B to improve the charging efficiency of the dust 5. Since the resistance decreases when the humidity becomes higher, the charge amount of the dust 5 flowing into the air path 16 also decreases. In addition, the charge amount of the collection plate 2 also tends to decrease easily. In other words, when the humidity becomes higher, the collection performance tends to decrease. Therefore, when the humidity of the inflowing air detected by the humidity detection unit 13 is above the preset set humidity, the collection performance is not reduced by increasing the amount of ions generated in the dust charging unit 1B. In this way, the collection performance can be prevented from changing due to humidity changes, and the collection performance can be automatically kept constant.

[0111] While the configuration described herein includes both the dust concentration detector 12 and the humidity detector 13, a configuration may also be configured with only one. Furthermore, the set concentration, set concentration difference, and set humidity can be appropriately set based on test results before installing the dust collector 200 in the air conditioner or the conditions after installation. Furthermore, the degree to which the amount of ion generation is increased or decreased based on the detection results of the environment detector 11 can also be appropriately set.

[0112] Next, the timing control of the frictional charging operation based on the calculation results of the ion generation amount accumulation unit 51h will be described. When the dust 5 flowing into the dust collector 200 reaches a certain amount, or when the degree of charge on the collecting plate 2 has decayed to a certain extent since the previous frictional charging operation, it is appropriate to perform the frictional charging operation on the collecting plate 2. As described above, the ion generation amount in the dust charging unit 1B is controlled based on the detection results of the dust concentration detection unit 12 and the detection results of the humidity detection unit 13. Therefore, the cumulative value of the ion generation amount from a certain time to a certain time is correlated with the total amount of dust 5 flowing into the dust collector 200 and the charge decay characteristics of the collecting plate 2 within that time range.

[0113] Therefore, when the total amount of ion generation calculated by the ion generation accumulation unit 51h reaches a preset total amount, the control unit 7 determines that it is time to perform the frictional charging operation on the collection plate 2 and performs the frictional charging operation. This allows the frictional charging operation to be automatically performed at the appropriate time. Furthermore, the set total amount of ion generation can be appropriately set based on test results before installing the dust collector 200 in the air conditioner or the conditions after installation.

[0114] In addition, while the configuration described above includes the ion generation amount integrating unit 51h in a configuration including the dust concentration detecting unit 12, the ion generation amount integrating unit 51h may also be provided in Embodiment 1 without the dust concentration detecting unit 12. Furthermore, the ion generation amount integrating unit 51h may calculate the total amount of ions generated by the ion generating unit 51, which generates a certain amount of ions per unit time, and determine that the timing for performing the frictional charging operation of the collecting plate 2 is reached when the total amount of ions generated reaches a predetermined total amount.

[0115] Furthermore, during the friction charging operation, the dust 5 adsorbed on the surface of the collecting plate 2 is de-electrified, thereby improving the efficiency of removing the dust 5 during the friction charging operation. Figure 12 and Figure 13 Next, the static removal of the dust 5 adsorbed on the surface of the collecting plate 2 will be described.

[0116] Figure 12 This is a diagram showing a state of the dust collecting device according to the third embodiment during the dust collecting operation. Figure 13 This is a diagram showing a state of the dust collecting tool according to the third embodiment during frictional charging operation.

[0117] First, in Figure 12 During the dust collection operation shown, the control unit 7 generates positive ions 52a from the ion generating component 51 of the dust charging unit 1B, thereby charging the dust 5 contained in the air. In addition, the control unit 7 applies a negative DC voltage, which is the same as the charging polarity of the collecting plate 2, to the ion removal electrode 54 from the DC power supply 55, and the ion removal electrode 54 removes the positive ions 52a. As a result, the downstream of the ion removal electrode 54 is in a state of removing the positive ions 52a. In addition, Figure 12 In the dust collecting operation, the rotation of the collecting plate 2 is stopped and the charged dust 53 is collected by the collecting plate 2 .

[0118] exist Figure 13 In the friction charging operation shown, as described above, the collecting plate 2 rotates in the direction indicated by the arrow in the figure. Then, the control unit 7 causes negative ions 52b of the same polarity as the charging polarity of the collecting plate 2 to be generated from the ion generating component 51 of the dust charging unit 1B. In addition, as in the dust collection operation, the control unit 7 applies a DC voltage of the same negative polarity as the charging polarity of the collecting plate 2 from the DC power supply 55 to the ion removal electrode 54. In the frame 15B, in addition to the negative ions 52b generated from the ion generating component 51, there is a state in which positive ions 52a also coexist. As described above, the positive ions 52a among the positive and negative ions in the frame 15B are removed by the ion removal electrode 54, and the negative ions 52b are not removed by the ion removal electrode 54 but flow into the frame 15A and pass through the gap between the collecting plates 2.

[0119] By allowing negative ions 52b of the same polarity as the charging polarity of the collecting plates 2 to pass through the gaps between the collecting plates 2, the charged dust 53 adsorbed on the surface of the collecting plates 2 is de-electrified. Figure 13 The dust 5 after the static electricity is eliminated is shown as dust 56. Since the attraction between the dust 56 after the static electricity is eliminated and the collecting plate 2 is weakened, the dust 56 is easily brushed off by the brush 3a, and the dust 56 can be cleaned efficiently.

[0120] As described above, the dust collecting device 200 of Embodiment 3 can achieve the same effects as those of Embodiments 1 and 2, and can also achieve the following effects. Specifically, the dust collecting device 200 of Embodiment 3 includes an environment detection unit 11 for detecting the environment within the air duct 16, and a control unit 7 for controlling the amount of ions generated by the dust charging unit 1B based on the detection results of the environment detection unit 11. This ensures stable collection performance regardless of the air environment within the air duct 16.

[0121] The environment detection unit 11 includes a dust concentration detection unit 12 having an upstream dust concentration detection unit 12a for detecting the dust concentration at a position upstream of the collecting plate 2 in the air duct 16. The control unit 7 increases the amount of ions generated by the dust charging unit 1B when the dust concentration detected by the upstream dust concentration detection unit 12a is equal to or higher than a preset concentration.

[0122] Therefore, even if air with a high degree of pollution flows into the dust collecting device 200, a high collection performance can be stably obtained.

[0123] Furthermore, when the dust concentration detected by the upstream dust concentration detection unit 12a is lower than a preset concentration, the control unit 7 reduces the amount of ions generated by the dust charging unit 1B or turns off the dust charging unit 1B.

[0124] This can prevent wasteful power consumption in the dust electrification unit 1B.

[0125] The dust concentration detection unit 12 further includes a downstream dust concentration detection unit 12b for detecting the dust concentration at a position downstream of the collecting plate 2 in the air duct 16. The control unit 7 increases the amount of ion generation in the dust charging unit 1B when the difference between the dust concentration detected by the upstream dust concentration detection unit 12a and the dust concentration detected by the downstream dust concentration detection unit 12b is lower than a preset set concentration difference.

[0126] This makes it possible to stably obtain high collection performance.

[0127] The environment detection unit 11 includes a humidity detection unit 13 for detecting the humidity in the air duct 16. When the humidity detected by the humidity detection unit 13 is equal to or higher than a preset humidity, the control unit 7 increases the amount of ions generated in the dust charging unit 1B.

[0128] This can prevent the collection performance from fluctuating due to humidity fluctuations.

[0129] The dust collecting device 200 of the third embodiment includes an ion generation amount integrating unit 51h provided in the control unit 7 for integrating the amount of ions generated in the dust charging unit 1B. When the total amount of ions generated obtained by the ion generation amount integrating unit 51h reaches a preset total amount, the control unit 7 performs friction charging.

[0130] Thereby, the friction charging operation can be performed automatically and at an appropriate timing.

[0131] The control unit 7 generates ions having the same polarity as the charging potential of the collecting plate 2 from the dust charging unit 1B during the friction charging operation.

[0132] Therefore, during the dust collection operation, a higher collection performance can be stably obtained. During the friction charging operation, the collection plate 2 can be de-charged by utilizing ions with the same polarity as the charged potential of the collection plate 2 generated from the dust charging part 1B, and the dust 5 can be efficiently removed from the surface of the collection plate 2.

[0133] Description of Reference Signs

[0134] 1 Dust collecting device, 1A Dust collecting portion, 1B Dust charging portion, 2 Collecting plate, 3 Collecting plate charging portion, 3a Brush, 3aa Support plate, 3ab Non-woven fabric, 3ac Mounting hole, 4 Dust box, 5 Dust, 6 Motor, 7 Control unit, 8 First axis, 9 Second axis, 10 Heat exchange ventilation device, 11 Environment detection unit, 12 Dust concentration detection unit, 12a Upstream dust concentration detection unit, 12b Downstream dust concentration detection unit, 13 Humidity detection unit, 14a Suction port, 14b Exhaust port, 14c Suction port, 14d Exhaust port, 15A Frame, 15B Frame, 15a Upper surface, 15b Lower surface, 16 Air duct, 16A Air duct, 16B Air duct, 17 Agglomerate, 18 First baffle member , 19 second baffle member, 20 ceiling, 21 outdoor air supply port, 22 outdoor exhaust port, 23 indoor air supply port, 24 indoor exhaust port, 30 air supply duct, 31 duct, 40 exhaust duct, 41 duct, 51 ion generating component, 51a fibrous electrode, 51b high voltage power supply, 51c soft X-ray ion generator, 51d ion generator control unit, 51e ultraviolet light source, 51f light source control unit, 51g optoelectronic material, 51h ion generation amount accumulation unit, 52a positive ions, 52b negative ions, 53 charged dust, 54 ion removal electrode, 54a opening, 54aa inner circumference, 55 DC power supply, 56 dust, 100 dust collecting device, 200 dust collecting device.

Claims

1. A dust collecting device that collects dust contained in air passing through an air passage using a collecting plate charged by friction, wherein: The dust collecting device comprises: a dust charging unit, the dust charging unit being arranged upstream of the collecting plate in the direction in which the air passes, generating ions and charging the dust so that the dust is attracted by electrostatic force and is collected by the collecting plate; a brush configured to contact a surface of the capture plate; a motor that rotates the capture plate; a control unit that performs a friction charging operation, wherein the control unit controls the motor to rotate the collecting plate, uses the brush to brush off the dust collected by the collecting plate to clean the collecting plate, and charges the collecting plate through friction with the brush; as well as an ion generation amount accumulation unit, which is provided in the control unit and accumulates the ion generation amount in the dust charging unit, The control unit performs the frictional charging operation when the total amount of ion generation obtained by the ion generation amount integrating unit reaches a preset total amount.

2. The dust collecting device according to claim 1, wherein: The dust charging unit includes a fiber-shaped electrode.

3. The dust collecting device according to claim 2, wherein: The dust charging unit generates ozone.

4. The dust collecting device according to claim 1, wherein: The dust charging unit includes a soft X-ray ionizer.

5. The dust collecting device according to claim 1, wherein: The dust charging unit includes an ultraviolet light source and a photoelectronic material.

6. The dust collecting device according to any one of claims 1 to 5, wherein The dust charging unit charges the dust to a polarity opposite to the charging polarity of the collecting plate.

7. The dust collecting device according to any one of claims 1 to 5, wherein The dust collecting tool includes an ion removal electrode that is disposed between the dust charging portion and the collecting plate and allows ions having a polarity opposite to that of the charging polarity of the collecting plate to flow in.

8. The dust collecting device according to claim 7, wherein: The ion removal electrode is maintained at a ground potential or a potential having the same polarity as the charged potential of the collecting plate.

9. The dust collecting device according to claim 7, wherein: The ion removal electrode has a mesh-shaped metal plate and is arranged in the air path in a manner that allows the dust to pass through the opening of the mesh. The thickness of the metal plate in the direction of air passing is set to a thickness that allows the dust charged by the dust charging part to pass through the opening without being adsorbed on the inner peripheral surface of the opening of the metal plate.

10. The dust collecting device according to claim 1, wherein: The dust collecting device includes an environment detection unit that detects the environment in the air duct. The control unit controls the amount of ions generated in the dust charging unit based on the detection result of the environment detection unit.

11. The dust collecting device according to claim 10, wherein: The environment detection unit includes a dust concentration detection unit having an upstream dust concentration detection unit for detecting the dust concentration at a position upstream of the collecting plate in the air duct. The control unit increases the amount of ions generated by the dust charging unit when the dust concentration detected by the upstream dust concentration detection unit is equal to or higher than a preset concentration.

12. The dust collecting device according to claim 11, wherein: The control unit reduces the amount of ions generated by the dust charging unit or turns off the dust charging unit when the dust concentration detected by the upstream dust concentration detection unit is lower than a preset concentration.

13. The dust collecting device according to claim 11 or claim 12, wherein: The dust concentration detection unit further includes a downstream dust concentration detection unit for detecting the dust concentration at a position downstream of the collecting plate in the air duct. The control unit increases the amount of ions generated by the dust charging unit when the difference between the dust concentration detected by the upstream dust concentration detection unit and the dust concentration detected by the downstream dust concentration detection unit is lower than a preset concentration difference.

14. The dust collecting device according to any one of claims 10 to 12, wherein The environment detection unit includes a humidity detection unit for detecting the humidity in the air duct. The control unit increases the amount of ions generated by the dust charging unit when the humidity detected by the humidity detection unit is equal to or higher than a preset humidity.

15. The dust collecting device according to claim 1, wherein In the dust collecting operation in which the control unit controls the motor to rotate the collecting plate and charge the collecting plate and uses the collecting plate to collect the dust contained in the air, the dust charging unit generates ions with a polarity opposite to that of the charged potential of the collecting plate, and in the friction charging operation, ions with the same polarity as the charged potential of the collecting plate are generated from the dust charging unit.

16. An air conditioner, wherein: The air conditioner is equipped with the dust collecting device according to any one of claims 1 to 15.

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