air purifier

Abstract

To provide an air cleaner which can prevent an installation surface from being electrically charged while reducing the cost to prevent pollution on the installation surface due to adhesion of dusts on the installation surface.SOLUTION: An air cleaner is installed on an indoor installation surface and purifies indoor air. The air cleaner includes an electrically non-conductive housing 10 provided with an air inlet which suctions the air and an air outlet 14 which blows out the air, a blower which is housed in the housing 10 and produces an airflow with which the air is suctioned from the air inlet and is blown out from the air outlet 14, a discharge type electrical dust collector which is housed in the housing 10 and removes impurities in the airflow, and a louver 15 which is provided in the air outlet 14 and adjusts a wind direction of the air blown out from the air outlet 14. The air cleaner has an electric conductive part 21 having electric conductivity on a contact surface with which blow-out wind blown out from the air outlet 14 in the louver 15 comes into contact.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present disclosure relates to an air purifier intended to purify indoor air. [Background technology]

[0002] Conventionally, methods have been used to collect impurities in the air using ions generated by discharge. Patent Document 1 discloses an air purifier having a pre-charging unit to which a high voltage is applied, a dust collecting unit provided downstream of the pre-charging unit, and a main body case incorporating the pre-charging unit and the dust collecting unit. Patent Document 1 discloses that the entire surface of the main body case of the air purifier is painted with a conductive paint to prevent static buildup on the wall on which the air purifier is installed and to prevent dust from adhering to the wall and causing contamination. Patent Document 1 also discloses that the entire main body case is made of a synthetic resin containing a conductive resin to prevent static buildup on the wall on which the air purifier is installed and to prevent dust from adhering to the wall and causing contamination. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 6-254439 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the air purifier described in Patent Document 1, when the entire surface of the main body case is painted with conductive paint, a large amount of expensive conductive resin material is used, which increases the cost of the air purifier. Also, when the entire main body case is made of synthetic resin containing conductive resin, a large amount of expensive conductive resin material is used, which increases the cost of the air purifier.

[0005] The present disclosure has been made in consideration of the above, and aims to provide an air purifier that can prevent static electricity from building up on the installation surface while keeping costs down, and can prevent the installation surface from becoming dirty due to dust adhering to the installation surface. [Means for solving the problem]

[0006] To solve the above-mentioned problems and achieve the object, the air purifier according to the present disclosure is an air purifier that is installed on an indoor installation surface and purifies the air in the room. The air purifier includes a non-conductive housing provided with an air inlet for drawing in air and an air outlet for blowing out air, a blower housed in the housing and generating an airflow that draws in air through the air inlet and blows out air through the air outlet, a discharge-type electrostatic precipitator housed in the housing and removing impurities in the airflow, and a louver provided at the air outlet for adjusting the direction of the air blown out from the air outlet. The air purifier has a conductive portion that is conductive on the contact surface of the louver that is the surface that contacts the air blown out from the air outlet. The conductive portion is electrically connected to the electrode on the low potential side of the electrostatic precipitator. [Effects of the Invention]

[0007] The air purifier according to the present disclosure has the effect of preventing static electricity from building up on the installation surface while keeping costs down, and preventing the installation surface from becoming dirty due to dust adhering to the installation surface. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram showing the appearance of the air purifier according to the first embodiment, and is a perspective view of the air purifier seen from below. [Figure 2] FIG. 1 is a diagram showing the appearance of the air purifier according to the first embodiment, and is a perspective view of the air purifier seen from above. [Figure 3] 1 is a configuration diagram showing an outline of the configuration of the air purifier according to the first embodiment, and is a view corresponding to a cross section taken along line III-III in FIG. [Figure 4] FIG. 1 is a schematic diagram illustrating the principle of electric dust collection in an electric dust collector provided in an air purifier according to a first embodiment. [Figure 5] FIG. 1 is a diagram showing the appearance of the air purifier according to the first embodiment, and is a perspective view of the air purifier from below with a louver provided at the air outlet. [Figure 6] FIG. 1 is a first schematic diagram illustrating a louver provided at an air outlet of the air purifier according to the first embodiment; [Figure 7] FIG. 2 is a second schematic diagram illustrating a louver provided at the air outlet of the air purifier according to the first embodiment; [Figure 8] FIG. 1 is a diagram illustrating an example of a discharge path of a conductive part included in the air purifier according to the first embodiment. [Figure 9] FIG. 1 is a diagram showing a louver provided in an air purifier according to a first embodiment. [Figure 10] FIG. 1 is a diagram showing a conductive part provided in a fan casing included in the air purifier according to the first embodiment; [Figure 11] FIG. 1 is a perspective view illustrating a configuration of a blower of an air purifier according to a first embodiment. [Figure 12] FIG. 1 is a diagram illustrating linear convex portions of a conductive portion provided on a fan casing included in the air purifier according to the first embodiment and blades of the fan. [Figure 13] FIG. 1 is a diagram showing a conductive part provided in a fan included in the air purifier according to the first embodiment; [Figure 14] FIG. 1 is a diagram showing a functional configuration related to temporary stop control of an electric dust collector in an air purifier according to a first embodiment. [Figure 15] 10 is a flowchart showing an example of a procedure for controlling temporary suspension of the electric dust collector in the air purifier according to the first embodiment. [Figure 16] 10 is a flowchart showing another example of the procedure for controlling temporary suspension of the electric dust collector in the air purifier according to the first embodiment. [Figure 17] FIG. 1 is a diagram illustrating an example of a conductive part included in the air purifier according to the first embodiment. [Figure 18] FIG. 1 is a diagram illustrating an example of a conductive part included in the air purifier according to the first embodiment. [Figure 19] FIG. 1 is a diagram showing a configuration in which each function of a control unit according to a first embodiment is realized by hardware. [Figure 20] FIG. 1 is a diagram showing a configuration in which each function of a control unit according to a first embodiment is realized by software. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an air purifier according to an embodiment will be described in detail with reference to the drawings. Note that in the drawings shown below, the scale of each component may differ from the actual scale for ease of understanding. The same applies to each of the drawings.

[0010] Embodiment 1 (Overall configuration of the air purifier) FIG. 1 is a diagram showing the appearance of the air purifier 1 according to the first embodiment, and is a perspective view of the air purifier 1 as seen from below. FIG. 2 is a diagram showing the appearance of the air purifier 1 according to the first embodiment, and is a perspective view of the air purifier 1 as seen from above. FIG. 3 is a configuration diagram showing an outline of the configuration of the air purifier 1 according to the first embodiment, and is a view corresponding to a cross section taken along line III-III in FIG. 1. Note that in FIG. 3, for ease of understanding, some parts are shown as side views and some hatching is omitted.

[0011] First, the basic structure of the air purifier 1 according to the first embodiment will be described. The air purifier 1 can be installed on a wall surface 500 of a wall 501 or on a ceiling surface, and removes contaminants from indoor air to purify the indoor air environment. The wall surface 500 and the ceiling surface are installation surfaces on which the air purifier 1 is installed. The air purifier 1 has a housing 10 that forms the outer shell of the air purifier 1. The housing 10 is made of a housing main body 11 and a front panel 12 and has a rectangular parallelepiped shape. The housing 10 is made of a non-conductive resin and is non-conductive, and has a rectangular parallelepiped shape in which the depth dimension is smaller than the width dimension and height dimension.

[0012] The width direction of the air purifier 1 corresponds to the width direction of the housing 10, and corresponds to the X-axis direction in FIGS. 1 to 3. The width direction of the air purifier 1 can be said to be the left-right direction. The depth direction of the air purifier 1 corresponds to the depth direction of the housing 10, and corresponds to the Y-axis direction in FIGS. 1 to 3. The depth direction of the air purifier 1 can be said to be the thickness direction of the air purifier 1 or the thickness direction of the housing 10. The height direction of the air purifier 1 corresponds to the height direction of the housing 10, and corresponds to the Z-axis direction in FIGS. 1 to 3. When the air purifier 1 is installed on a wall surface 500, the height direction of the air purifier 1 is the up-down direction, which is a direction parallel to the vertical direction. When the air purifier 1 is installed on a ceiling surface, the height direction of the air purifier 1 corresponds to a direction parallel to the horizontal direction. In addition, in the air purifier 1, the side where the front panel 12 is located in the depth direction is the front side, and the side opposite the side where the front panel 12 is located in the depth direction is the back side. The left-right direction is the left-right direction when the air purifier 1 is viewed from the front side.

[0013] The housing main body 11 is a first component constituting the housing 10, having a rectangular parallelepiped shape with one open side. As shown in FIGS. 1 and 2, the housing 10 has an upper surface 10a, a lower surface 10b, a first side surface 10c, a second side surface 10d, a front surface 10e, and a rear surface 10f. The first side surface 10c is the left side surface when viewed from the front side. The second side surface 10d is the right side surface when viewed from the front side. The first side surface 10c and the second side surface 10d are a pair of side surfaces facing each other in the width direction of the housing 10. The front surface 10e is formed by a front panel 12. The housing main body 11 is open on one front side surface, i.e., the surface of the housing 10 corresponding to the front surface 10e. In addition, the top surface 10a, the bottom surface 10b, the first side surface 10c, the second side surface 10d and the back surface 10f can also be considered as the top surface of the housing main body 11, the bottom surface of the housing main body 11, the first side surface of the housing main body 11, the second side surface of the housing main body 11 and the back surface of the housing main body 11, respectively.

[0014] The air purifier 1 is installed on the wall surface 500 with the back surface 10f facing the wall surface 500. Specifically, the air purifier 1 is installed on the wall surface 500 with the upper surface 10a facing vertically upward, the lower surface 10b facing vertically downward, the front surface 10e and the back surface 10f being parallel to the vertical direction, and the back surface 10f facing the wall surface 500. Therefore, when the air purifier 1 is installed on the wall surface 500, the back surface 10f facing the front panel 12 of the housing 10 is the facing surface facing the wall surface 500.

[0015] The housing 10 has an intake port 13, which is an opening for taking in indoor air into the housing 10, formed on the first side surface 10c. That is, the housing main body 11 has the intake port 13 formed on the first surface of the housing main body 11, which is the side surface adjacent to the open surface on the left side. The housing 10 also has an outlet port 14, which is an opening for blowing air inside the housing 10 to the outside of the housing 10, formed on the bottom surface 10b. That is, the housing main body 11 has the outlet port 14 formed on the second surface of the housing main body 11, which is the side surface adjacent to the open surface on the lower side, and the outlet port 14 is formed to open vertically downward when the housing is installed on the wall surface 500.

[0016] Front panel 12 is a lid that covers one open side of housing main body 11, and is the second component that constitutes housing 10. In other words, the front of air purifier 1 and front surface 10e of housing 10 are formed by front panel 12. When front panel 12 opens to the front side, air purifier 1 allows access to each component housed inside housing 10, enabling periodic cleaning of each component housed inside housing 10 and maintenance in the event of a malfunction.

[0017] The air purifier 1 is mounted on the wall surface 500 via a metal mounting bracket 400, which is a mounting component for mounting the housing 10 on the wall surface 500, which is the mounting surface. The mounting bracket 400 is necessary for mounting the air purifier 1 on the wall surface 500 for the following reasons. The first reason is that by widening the fixing range between the rear surface 10f and the wall surface 500, the load applied to the rear surface 10f is distributed, reducing the stress applied to the fastening parts and allowing the air purifier 1 to be safely mounted. The second reason is that in order to mount the air purifier 1 on the wall surface 500 in the correct position without tilting, the air purifier 1 needs to be fixed with screws with high precision. However, it is difficult to determine the screw fixing positions while supporting the mass of the air purifier 1 during the installation process, so the mounting bracket 400 needs to be fixed with lightweight components with high precision. In other words, the reason why the mounting bracket 400 is necessary to install the air purifier 1 on the wall surface 500 is to facilitate safe and accurate installation of the air purifier 1 without concerns about rattling or coming off, and without deviations in the installation position or angle.

[0018] (Internal structure of the air purifier) The air purifier 1 includes a dust collection unit 100, a blower 200, and a circuit unit 300 inside the housing 10. The dust collection unit 100, the blower 200, and the circuit unit 300 are housed in this order in the width direction of the housing 10, from the first side surface 10c on which the air inlet 13 is formed. That is, the dust collection unit 100, the blower 200, and the circuit unit 300 are housed in this order in the direction from the first side surface 10c toward the second side surface 10d.

[0019] The air purifier 1 includes a plurality of electrical components, such as a light-emitting diode (LED), an operation switch, an operation on / off switching timer, a remote control light receiving unit, a sensor, and an electric dust collector power supply, inside the housing 10. Each of the electrical components is connected by electrical wiring to a low-voltage circuit board 302 of the circuit unit 300, which will be described later.

[0020] The display LED functions as a display unit that displays various information related to the operation of the air purifier 1, such as the operating airflow rate of the air purifier 1 and the state of indoor air pollution. The operation switch is an operation unit for performing operations such as turning the power of the air purifier 1 on or off, adjusting the operating airflow rate of the air purifier 1, and switching the air purifier 1 between automatic and manual operation modes.

[0021] The operation on / off switching timer measures the time period of the temporary suspension period during which the electrostatic precipitator 120 is temporarily stopped. Details of the operation on / off switching timer will be described later.

[0022] The sensor is a detection unit that detects indoor conditions. The sensor includes a sensor that detects indoor air quality, such as indoor air humidity, dust in the indoor air, odor in the indoor air, and carbon dioxide (CO2) concentration in the indoor air. The sensor also includes a human presence sensor that uses infrared rays to detect the presence of people in the room. The electrostatic precipitator power supply is a power supply unit that supplies high-voltage power for discharging to the electrostatic precipitator 120 (described later) of the dust collection unit 100.

[0023] The dust collecting unit 100 is disposed inside the housing 10 on the first side surface 10c side in the width direction of the housing 10. That is, the dust collecting unit 100 is housed inside the housing 10 on the side of the suction port 13 in the width direction of the housing 10. The dust collecting unit 100 includes a mesh filter 110, an electrostatic precipitator 120, and a deodorizing filter 130. The mesh filter 110, the electrostatic precipitator 120, and the deodorizing filter 130 are housed in this order in the width direction of the housing 10 from the first side surface 10c side on which the suction port 13 is formed. That is, the mesh filter 110, the electrostatic precipitator 120, and the deodorizing filter 130 are housed in this order in the direction from the first side surface 10c toward the second side surface 10d. It can be said that the mesh filter 110, the electrostatic precipitator 120, and the deodorizing filter 130 are housed in this order from the upwind side of the airflow drawn into the air purifier 1.

[0024] The mesh filter 110 removes impurities such as dust particles or dirt from the air drawn into the air purifier 1, filtering and purifying the air drawn into the air purifier 1. When considering the pressure loss of the mesh filter 110, it is preferable that the mesh filter 110 be made of a material with a coarse mesh. On the other hand, when considering periodic maintenance of the downstream electrostatic precipitator 120, it is preferable that the mesh filter 110 have an opening size of about 0.5 mm in order to prevent electrical short circuits caused by dust bridging between the electrodes of the electrostatic precipitator 120.

[0025] The electrostatic precipitator 120 removes impurities such as dust particles or dirt from the air being drawn into the housing 10, thereby purifying the air being drawn into the housing 10. The electrostatic precipitator 120 applies an electric charge to various fine particles contained in the air being drawn into the housing 10, and attracts the fine particles to a dust collection electrode, thereby capturing the fine particles and purifying the air being drawn into the housing 10. That is, the electrostatic precipitator 120 applies a high voltage between a discharge electrode and a dust collection electrode to generate ions by discharge, thereby charging the fine particles passing between the electrodes. The electrostatic precipitator 120 then uses the electric field between the electrodes to attract the fine particles to the dust collection electrode by Coulomb force, thereby collecting the fine particles.

[0026] 4 is a schematic diagram illustrating the principle of electrostatic precipitator 120 included in the air purifier 1 according to the first embodiment. The electrostatic precipitator 120 includes a discharge positive electrode 121, which is a discharge electrode, a discharge negative electrode 122, which is a dust collecting electrode, and an electrostatic precipitator power supply (not shown). In one example, the dust collecting device power supply is disposed in an area where the circuit unit 300 is disposed inside the housing main body 11, and is connected to the discharge positive electrode 121 and the discharge negative electrode 122 via wiring (not shown). In the electrostatic precipitator 120, when a high voltage is applied between the discharge positive electrode 121 and the discharge negative electrode 122 from the electrostatic precipitator power supply, positively charged ions are generated by corona discharge in a discharge region 123, which is a region between the discharge positive electrode 121 and the discharge negative electrode 122. Fine particles such as dust 124 that bind with these positively (+) charged ions and become positively (+) charged and float around are attracted to the discharge unit negative electrode 122 on the low potential side, where they adhere and accumulate, thereby purifying the air. Therefore, the electric dust collector 120 according to the first embodiment is a positive discharge type electric dust collector.

[0027] The deodorizing filter 130 adsorbs and decomposes odors in the air drawn into the air purifier 1, and deodorizes by reducing the concentration of odorous components in the air and chemically converting the odorous components in the air into less odorous substances.

[0028] Blower 200 generates airflow 45, which is drawn into housing 10 through suction port 13, passes through dust collection unit 100, and is blown out of housing 10 through outlet 14. A centrifugal blower is used for blower 200. Blower 200 has fan 202 and motor 203 housed inside fan casing 201. A centrifugal fan suitable for forming an air path from suction port 13 to outlet 14 via dust collection unit 100 is used for fan 202, in order to achieve a thin product shape for air purifier 1.

[0029] Blower 200 is disposed on the downwind side of electrostatic precipitator 120 in an air passage extending from air inlet 13 to air outlet 14 inside housing 10. Blower 200 draws air through an air inlet provided on the fan 202 side of fan casing 201. A bell mouth 204 that constitutes fan casing inlet 205, which is an air inlet for blower 200, and that guides the airflow that passes through dust collecting unit 100 toward fan 202 of blower 200 is provided on the surface of fan casing 201 facing front panel 12. An air passage wall 150 that guides the airflow from the dust collecting unit 100 side toward bell mouth 204 is provided on the blower 200 side of dust collecting unit 100, connected to the surface of fan casing 201 facing the dust collecting unit 100. Bell mouth 204 can be said to be an air guide path that guides air flow 45, which is sucked in through suction port 13 and flows through dust collection section 100, into blower 200. In the air purifier, air flows into housing 10 from suction port 13. The air that has flowed into housing 10 is sucked into fan 202 through the suction port of blower 200 and blown out toward air outlet 14.

[0030] The circuit unit 300 is a component for controlling the operation of the air purifier 1. The circuit unit 300 is disposed inside the housing 10 on the second side surface 10d side in the width direction of the housing 10. That is, the circuit unit 300 is housed inside the housing 10 on the opposite side of the housing 10 from the air inlet 13 in the width direction of the housing 10, with the blower 200 sandwiched between them. The circuit unit 300 controls the operation of the electrical components mounted in the air purifier 1. The circuit unit 300 includes a control circuit for controlling the operation of the air purifier 1, i.e., a control circuit for controlling the motor 203 of the blower 200 and other electrical components described below, which are electrical components mounted in the air purifier 1. The circuit unit 300 includes a high-voltage circuit board 301, a low-voltage circuit board 302, a sheet metal case 303, and a control unit 310.

[0031] High-power circuit board 301 is a board on which a high-power circuit is mounted. High-power circuit board 301 according to the first embodiment is connected to a power supply connector, and power is supplied from an external power supply. The power supply connector is a portion to which a cable is connected that draws power for air purifier 1 from an external power supply outside air purifier 1. The power supply connector and the external power supply are connected using a cable such as a VVF (Vinyl insulated Vinyl sheathed Flat-type) cable.

[0032] High-voltage circuit board 301 functions as a power generation device that uses power supplied from an external power source to generate drive power for driving motor 203 of fan 200, which has a relatively large drive current value among the electrical components mounted on air purifier 1. High-voltage circuit board 301 supplies the generated drive power to motor 203.

[0033] The low-voltage circuit board 302 is a board on which a low-voltage circuit is mounted. The low-voltage circuit board 302 according to the first embodiment is connected to a power supply connector via a transformer (not shown) and receives power from an external power supply. The low-voltage circuit board 302 functions as a power generation device that generates drive power using power supplied from an external power supply to drive electrical components mounted in the air purifier 1, such as the display LED, operation switch, operation on / off timer, sensor, and electrostatic precipitator 120, which have relatively small drive currents. That is, the low-voltage circuit board 302 functions as a power generation device that generates drive power using power supplied from an external power supply to drive electrical components that have smaller drive currents than the motor 203. The low-voltage circuit board 302 supplies the generated drive power to the electronic components, such as the display LED, operation switch, operation on / off timer, sensor, and electrostatic precipitator 120.

[0034] A high-voltage circuit is a circuit with a voltage exceeding 42.4 V as defined in the IEC-60335 standard of the International Electrotechnical Commission (IEC). A low-voltage circuit is a circuit with a voltage of 42.4 V or less as defined in the IEC-60335 standard.

[0035] Sheet metal case 303 is made of a metal plate and covers the front and side surfaces of high-power circuit board 301 to protect high-power circuit board 301. It is also possible to cover sheet metal case 303 from the front, back, and side surfaces.

[0036] The control unit 310 is provided in a control circuit, and controls the operations of electrical components mounted on the air purifier 1, such as display LEDs, operation switches, an operation on / off switching timer, sensors, and the electrostatic precipitator 120.

[0037] Next, the features of the air purifier 1 according to the first embodiment configured as described above will be described. The air purifier 1 has a conductive part provided in the air passage from the electrostatic precipitator 120 to the air outlet 14 inside the housing 10, and this allows ions to be discharged at the conductive part, thereby preventing contamination of the surface of the air purifier 1 and the wall surface 500 caused by the charging of the air purifier 1. Furthermore, the air purifier 1 having a conductive part provided in the air passage from the electrostatic precipitator 120 to the air outlet 14 inside the housing 10 can prevent contamination of the surface of the air purifier 1 and the wall surface 500 caused by the charging of the air purifier 1 by temporarily stopping the operation of the electrostatic precipitator 120 while the air purifier 1 is operating.

[0038] (Conductive part formed on the louver) First, the air path configuration of the air purifier 1 will be described. FIG. 5 is a diagram showing the appearance of the air purifier 1 according to the first embodiment, and is a perspective view of the air purifier 1 seen from below with the louvers 15 provided at the air outlets 14. FIG. 5 corresponds to FIG. 1. FIG. 6 is a first schematic diagram illustrating the louvers 15 provided at the air outlets 14 of the air purifier 1 according to the first embodiment. FIG. 7 is a second schematic diagram illustrating the louvers 15 provided at the air outlets 14 of the air purifier 1 according to the first embodiment. FIG. 6 focuses on the housing 10, the air outlets 14, and the louvers 15 provided at the air outlets 14, and does not illustrate other components of the air purifier 1.

[0039] As described above, in air purifier 1, air outlet 14, which is an opening for blowing air inside housing 10 to the outside of housing 10, is formed on bottom surface 10b of housing 10. Air outlet 14 can be provided with louver 15 that changes the direction of airflow blown from inside housing 10 into the room, as shown in Figures 5 and 6. Louver 15 changes the direction of airflow blown from inside housing 10 into the room in the depth direction of air purifier 1.

[0040] Louver 15 has a flat plate shape, is made of non-conductive resin, and is arranged with its longitudinal direction parallel to the width direction of air purifier 1. Louver 15 is rotated by a louver drive unit such as a motor (not shown) around a rotation shaft (not shown) provided along the longitudinal direction as a fulcrum. The louver drive unit drives louver 15 in accordance with commands from control unit 310.

[0041] Air purifier 1 has a conductive part provided in the air path from electrostatic precipitator 120 to air outlet 14 inside housing 10, and this allows ions to be discharged at the conductive part, thereby preventing contamination of the surface of air purifier 1 and wall surface 500 caused by charging of air purifier 1. Louver 15 has conductive part 21, which is a conductive part having conductivity, on the contact surface of louver 15 that is the surface that contacts the air blown out from air outlet 14 into the room.

[0042] As described above, air purifier 1 includes, inside housing 10, electrostatic precipitator 120 that collects impurities in the air using ions generated by discharge. When air purifier 1 equipped with electrostatic precipitator 120 is installed on wall surface 500, if housing 10 of air purifier 1 is made of a general resin that is not conductive, the surface of housing 10 will become charged, and an electric field will be generated between housing 10 and the wall surface 500 on which housing 10 is installed, causing dust to be attracted to and adhere to wall surface 500 around housing 10, resulting in the problem of wall surface 500 becoming dirty.

[0043] One of the reasons that the housing 10 becomes charged is that some of the ions generated by corona discharge in the electrostatic precipitator 120 flow through the housing 10 with the air flow 45 and are blown out of the housing 10 from the outlet 14. The ions blown out of the housing 10 from the outlet 14 may adhere to the outer surface of the housing 10. The housing 10 becomes charged when the ions blown out of the housing 10 adhere to the outer surface of the housing 10.

[0044] Indoor air is drawn into the housing 10 through the air inlet 13, and impurities such as dust and dirt are removed by the dust collector 100. Relatively large particle size impurities in the air are removed by the mesh filter 110, and relatively small particle size impurities in the air are removed by the electrostatic precipitator 120. The air that has passed through the dust collector 100 and been purified is returned to the room through the air outlet 14 along with the airflow 45 generated by the blower 200. During this process of purifying the indoor air, in the electrostatic precipitator 120, dust is charged as it flows through the discharge region 123, which is the region between the discharge positive electrode 121 and the discharge negative electrode 122. The dust is then captured by the electrodes due to the electric Coulomb force generated in the charged dust by the electric field between the discharge negative electrode 122 and the electrostatic precipitator power supply.

[0045] The flow of air flow 45 is in a direction that crosses discharge region 123, which is the region between discharge unit positive electrode 121 and discharge unit negative electrode 122, and some of the discharge charge may be released to the outside of electrostatic precipitator 120 while riding on the flow of air flow 45. The charge released to the outside of electrostatic precipitator 120 then adheres to the outer surface of housing 10, thereby charging housing 10 and thus charging air purifier 1. When air purifier 1 becomes charged, it attracts dust that has an opposite charge and is floating indoors, and over long periods of use, the surface of air purifier 1 becomes covered with dust and becomes dirty. Furthermore, the charged air purifier 1 may polarize the wall to which the air purifier 1 is fixed, thereby dirtying the wall as well as the surface of air purifier 1.

[0046] Here, if the ions generated by corona discharge in the electrostatic precipitator 120 are positive ions with a positive (+) charge, the housing 10 will be positively charged. The wall surface 500 on which the air purifier 1 is installed is connected to the ground and is at a low potential. However, if the housing 10 is made of a typical resin that is not conductive, charge is unlikely to be discharged from the housing 10 to the wall surface 500, which is grounded, and the charge on the housing 10 will be maintained. Therefore, an electric field is generated from the positively charged housing 10 toward the wall surface 500, and impurities such as dust charged by the positive ions generated by corona discharge adhere to the wall surface 500 by Coulomb force, causing contamination on the wall surface 500.

[0047] Therefore, in air purifier 1 having non-conductive housing 10 made of non-conductive resin, conductive portion 21 is formed on the contact surface of louver 15 made of non-conductive resin and provided at air outlet 14. By providing conductive portion 21 on the contact surface of louver 15, air purifier 1 discharges positive ions attached to housing 10 from conductive portion 21 into the air, preventing the generation of an electric field extending from housing 10 to wall surface 500. This makes it possible to prevent contamination of the surface of air purifier 1 and wall surface 500 caused by charging of air purifier 1.

[0048] Furthermore, in air purifier 1, conductive portion 21 can be formed only on the contact surface of louver 15 provided at air outlet 14. Conductive material is a relatively expensive material among the materials constituting air purifier 1. In air purifier 1, by limiting the formation location of conductive portion 21 to the contact surface of louver 15, it is possible to reduce the amount of expensive conductive material used, and also to form conductive portion 21 in a location that is in frequent contact with the blown air, which is air flow 45 blown from the inside of housing 10 through air outlet 14 into the room, thereby enabling positive ions attached to air purifier 1 to be efficiently discharged.

[0049] That is, in the air purifier 1, by providing the conductive portion 21 on the contact surface of the louver 15, the amount of conductive material used to form the conductive portion 21 can be reduced, and contamination of the wall surface 500 due to dust adhering to the wall surface 500 can be prevented at low cost. For example, if the conductive portion is formed by painting a conductive material over the entire outer surface of the housing 10, a large amount of conductive material is used, which increases the cost of the air purifier 1. On the other hand, in the air purifier 1, by forming the conductive portion 21 only on the contact surface of the louver 15, the amount of conductive material used to form the conductive portion 21 can be reduced.

[0050] Furthermore, conductive portion 21 preferably has a convex shape. FIGS. 6 and 7 show conductive portion 21 having a convex shape with convex portion 21a protruding from flat portion 21b. Conductive portion 21 having a convex shape can have a larger surface area. Increasing the surface area of ​​conductive portion 21 increases the contact area between conductive portion 21 and the blown air, which is airflow 45 blown into the room from air outlet 14. This increases the contact efficiency between conductive portion 21 and the blown air, increasing the probability that positive ions carried by the blown air will adhere to conductive portion 21. This allows conductive portion 21 to more efficiently discharge positive ions carried by the blown air, improving the long-term reliability of preventing contamination of the surface of air purifier 1 and wall surface 500 due to charging of air purifier 1.

[0051] Here, the higher the height of the convex shape, the higher the contact efficiency between the conductive portion 21 and the blown air. On the other hand, if the height of the convex shape is too high, it will also lead to an increase in pressure loss of the blown air. For this reason, the convex shape is preferably a shape with multiple protrusions arranged like the inner wall of the small intestine, for example, so that the surface area of ​​the conductive portion 21 is large. In other words, the convex portion 21a is preferably a shape with multiple protrusions arranged like the inner wall of the small intestine, for example, so that the surface area of ​​the conductive portion 21 is large.

[0052] FIG. 8 is a diagram illustrating an example of a discharge path of the conductive portion 21 included in the air purifier 1 according to the first embodiment. The conductive portion 21 provided on the contact surface of the louver 15 is preferably electrically connected to the discharge portion negative electrode 122, which is the dust collecting electrode of the electrostatic precipitator 120. That is, it is preferably electrically connected to the discharge portion negative electrode 122, which is the low-potential electrode of the electrostatic precipitator 120. As a result, positive ions at the conductive portion 21 are constantly discharged to the ground via a path that passes from the conductive portion 21 to the discharge portion negative electrode 122, the power supply for the electrostatic precipitator 120, and the earth of the air purifier 1. This allows the conductive portion 21 to efficiently discharge positive ions attached to the housing 10, improving the reliability of preventing contamination of the surface of the air purifier 1 and the wall surface 500. In this case, the power supply for the electrostatic precipitator 120 corresponds to the low-voltage circuit board 302 of the circuit unit 300.

[0053] Furthermore, conductive portion 21 provided on the contact surface of louver 15 may be directly and electrically connected to the earth of air purifier 1. This allows positive ions at conductive portion 21 to always be discharged to the ground via a path that passes from conductive portion 21 to the earth, thereby efficiently discharging positive ions attached to housing 10 at conductive portion 21 and improving the reliability of preventing contamination of the surface of air purifier 1 and wall surface 500. In this case, conductive portion 21 provided on the contact surface of louver 15 and the earth of electrostatic precipitator 120 may be connected by wiring.

[0054] Furthermore, it is preferable that conductive portion 21 is formed only on a position on the inside of housing 10 on the contact surface of louver 15. By forming conductive portion 21 only on a position on the inside of housing 10 on the contact surface of louver 15, conductive portion 21 does not detract from the appearance of air purifier 1. Furthermore, by forming conductive portion 21 only on a position on the inside of housing 10 on the contact surface of louver 15, the user does not come into contact with conductive portion 21, and oils and grease from the human body are less likely to adhere to conductive portion 21. This increases the reliability of the function of conductive portion 21 when air purifier 1 is used for an extended period of time, and improves the long-term reliability of preventing contamination of the surface of air purifier 1 and wall surface 500 caused by static electricity in air purifier 1.

[0055] Fig. 9 is a diagram showing louver 15 included in air purifier 1 according to the first embodiment. Louver 15 has rotation shaft 16 and rotates around rotation shaft 16 as a fulcrum. In air purifier 1, rotation shaft 16 of louver 15 may be configured as conductive portion 21 having electrical conductivity. Fig. 9 shows louver 15 having rotation shaft 16 having electrical conductivity. That is, in Fig. 9, rotation shaft 16 forms a convex shape of conductive portion 21.

[0056] By using the conductive part 21 as the rotation axis 16 of the louver 15, the contact efficiency between the blown air and the conductive part 21 is improved without adding any new parts or changing the shape of the louver 15. This allows the conductive part 21 to more efficiently discharge the positive ions carried by the blown air, and prevents the surface of the air purifier 1 and the wall surface 500 from becoming dirty due to the charging of the air purifier 1.

[0057] The direction of the air blown into the room from the air purifier 1 depends on the design of the installation location of the air purifier 1 and the direction of the space to be cleaned, and may also be changed from time to time depending on conditions such as the presence or absence of people in the room. For this reason, a movable louver 15 provides user convenience. The movable structure of the louver 15 is generally a rotating shaft, and rod-shaped metal is easily available. Therefore, by using the rotating shaft 16 of the louver 15 as the conductive part 21, the conductive part 21 can be constructed inexpensively.

[0058] (Conductive part formed on the fan casing) Next, a case where a conductive part is provided in fan casing 201, which is a scroll casing of blower 200, will be described. FIG. 10 is a diagram showing conductive part 22 provided in fan casing 201 included in air purifier 1 according to embodiment 1. FIG. 10 shows a state in which conductive part 22 is provided in a part of fan casing 201 in FIG. 3. Note that for ease of understanding, FIG. 10 shows a part as a side view and some hatching is omitted. In air purifier 1, as shown in FIG. 10, conductive part 22 can be provided on inner surface 201a of fan casing 201, which is a scroll casing of blower 200. Fan casing 201 is a resin molded product that does not have electrical conductivity.

[0059] In air purifier 1, by providing conductive part 22, which is a conductive part, on inner surface 201a of fan casing 201 of blower 200, conductive part 22 can be formed at a location that is in frequent contact with blown air, which is air flow 45 that passes through electrostatic precipitator 120 and flows through an air passage inside air purifier 1 toward air outlet 14. As a result, in air purifier 1, positive ions contained in air flow 45 can be attached to conductive part 22, and the positive ions can be efficiently discharged from conductive part 22.

[0060] Specifically, conductive portion 22 is provided on inner surface 201a of fan casing 201, which is a non-conductive resin molded product, inner side surface 201b of fan casing 201, and inner bottom surface 201c of fan casing 201.

[0061] Furthermore, conductive materials are relatively expensive materials among the materials constituting air purifier 1. In air purifier 1, conductive part 22 is provided only on inner surface 201a of fan casing 201 of blower 200, so that the amount of conductive material used in conductive part 22 can be reduced.

[0062] Therefore, in the air purifier 1, by providing the conductive portion 22 only on the inner surface 201a of the fan casing 201, the amount of conductive material used to form the conductive portion 22 can be reduced, while at the same time preventing, at low cost, contamination of the surface of the air purifier 1 and the wall surface 500 caused by charging of the air purifier 1, which occurs when positive ions contained in the air flow 45 flowing downwind from the electrostatic precipitator 120 inside the housing 10 adhere to the surfaces of the components of the air purifier 1, including the surface of the housing 10.

[0063] 10, it is preferable to electrically connect the conductive part 22 to the ground wire 17. In FIG. 10, the electrical connection path electrically connecting the ground wire 17 of the air purifier 1 and the conductive part 22 is indicated by a medium-thick two-dot chain line. By electrically connecting the conductive part 22 to the ground wire 17, the conductive part 22 is grounded, and positive ions discharged from the conductive part 22 are discharged to the earth through the ground wire 17, thereby efficiently discharging the positive ions charged in the air purifier 1. This improves the reliability of the air purifier 1's effect of preventing contamination of the surface of the air purifier 1 and the wall surface 500 caused by the charging of the air purifier 1.

[0064] The conductive part 22 can be grounded by electrically connecting the conductive part 22 to the earth wire 17 connected to the metal mounting bracket 400 via the metal motor mounting plate 210. In other words, the conductive part 22 is connected to the motor mounting plate 210 and electrically connected to the earth wire 17 via the motor mounting plate 210 and the mounting bracket 400, thereby being grounded.

[0065] The motor mounting plate 210 is a metal mounting part used to mount the motor 203 to the housing 10. As shown in FIG. 10 , the motor mounting plate 210 penetrates the rear surface 10f of the housing 10 and is electrically connected to a mounting bracket 400 located between the wall surface 500 and the rear surface 10f. A ground wire 17 is also connected to the mounting bracket 400. The motor mounting plate 210 is made of a metal material with relatively high mechanical strength so that it has the strength to withstand the vibrations of the motor 203 and also has the function of supporting the weight of the air purifier 1. The motor mounting plate 210 is also connected to a ground wire 17 because it may be touched by a user, and is grounded to the earth by the ground wire 17.

[0066] Since conductive part 22 is electrically connected to earth wire 17 via metal motor mounting plate 210 and metal mounting bracket 400, there is no need to provide an additional dedicated conductive material part for grounding conductive part 22, thereby reducing the manufacturing costs of air purifier 1. Therefore, by bringing conductive part 22 formed on fan casing 201 into contact with motor mounting plate 210, conductive part 22 can be grounded without providing an additional dedicated conductive material part.

[0067] Although the case where conductive portion 22 is provided on inner side surface 201b and inner bottom surface 201c of fan casing 201 has been described here, conductive portion 22 may be provided on either inner side surface 201b or inner bottom surface 201c of fan casing 201. In this case as well, conductive portion 22 may be configured to be electrically connected to metal motor mounting plate 210.

[0068] Furthermore, conductive portion 22 preferably has a convex shape. FIG. 10 shows conductive portion 22 having a convex shape with convex portion 22a protruding from flat portion 22b. Conductive portion 22 having a convex shape can have a larger surface area. Increasing the surface area of ​​conductive portion 22 increases the contact area between conductive portion 22 and the blown air, which is airflow 45 blown into the room from air outlet 14. This increases the contact efficiency between conductive portion 22 and the blown air, increasing the probability that positive ions carried by the blown air will adhere to conductive portion 22. This allows conductive portion 22 to more efficiently discharge positive ions carried by the blown air, improving the long-term reliability of preventing contamination of the surface of air purifier 1 and wall surface 500 caused by charging of air purifier 1.

[0069] Here, the higher the height of the convex shape, the higher the contact efficiency between the conductive portion 22 and the blown air. On the other hand, if the height of the convex shape is too high, it will also lead to an increase in pressure loss of the blown air. For this reason, the convex shape is preferably a shape with multiple protrusions arranged like the inner wall of the small intestine, for example, so that the surface area of ​​the conductive portion 22 is large. In other words, the convex portion 22a is preferably a shape with multiple protrusions arranged like the inner wall of the small intestine, for example, so that the surface area of ​​the conductive portion 22 is large.

[0070] FIG. 11 is a perspective view illustrating the configuration of blower 200 of air purifier 1 according to the first embodiment. FIG. 11 illustrates a state in which front surface 10e of housing 10 of air purifier 1 is removed. FIG. 12 is a diagram illustrating linear convex portions 22a of conductive portion 22 provided on fan casing 201 included in air purifier 1 according to the first embodiment and blades 202a of fan 202. FIG. 12 schematically illustrates a portion of linear convex portions 22a of conductive portion 22 formed on inner surface 201a of fan casing 201, as seen through the outer surface of fan casing 201. In FIG. 12, the longitudinal direction of blade 202a is indicated by a dashed line. Fan 202 of blower 200, which is a centrifugal blower, is a multi-blade fan in which multiple blades 202a are arranged in a ring shape. Fan 202 rotates clockwise around motor rotation shaft 203a of motor 203 as a central axis.

[0071] 12 , when the convex portions 22a of the conductive portion 22 are formed in a line shape on the inner surface 201b of the inner surface 201a of the fan casing 201, if the number of the convex portions 22a of the conductive portion 22 and the number of the blades 202a of the fan 202 are relatively prime, it is possible to reduce noise during operation of the blower 200. When the inner surface 201b of the inner surface 201a of the fan casing 201 has a convex shape, that is, when the conductive portion 22 formed on the inner surface 201b of the inner surface 201a of the fan casing 201 has the convex portions 22a, pressure is generated inside the fan casing 201 when the blades 202a of the rotating fan 202 pass through a space facing the linear convex portions 22a, and therefore noise is generated. In this case, if the number of linear convex portions 22a and the number of blades 202a of fan 202 are not coprime, noise will be generated simultaneously at multiple locations where the blades 202a of rotating fan 202 face the linear convex portions 22a, resulting in a louder noise.

[0072] In contrast, if the number of linear convex portions 22a formed on the inner surface 201b of the inner surface 201a of the fan casing 201 and the number of blades 202a of the fan 202 are prime to each other, it is possible to avoid noise being generated simultaneously at multiple locations where the blades 202a of the rotating fan 202 face the convex portions 22a.

[0073] 12, by making the longitudinal direction of the linear convex portions 22a of the conductive portion 22 different from the longitudinal direction of the blades 202a, it is possible to reduce noise generated at the locations where the blades 202a of the rotating fan 202 face the convex portions 22a. The longitudinal direction of the convex portions 22a can be said to be the extension direction of the convex portions 22a. The longitudinal direction of the blades 202a can be said to be the extension direction of the blades 202a.

[0074] As described above, noise is generated when blades 202a of rotating fan 202 pass through the space facing the convex shape due to pressure. At this time, if the longitudinal direction of linear convex portion 22a formed on inner surface 201b of inner surface 201a of fan casing 201 is the same as the longitudinal direction of blades 202a, the total area where linear convex portion 22a and blades 202a face each other at the same time becomes large overall, and noise is generated at the same time, resulting in a loud noise.

[0075] In contrast, by making the longitudinal direction of the linear convex portion 22a of the conductive portion 22 formed on the inner surface 201b of the inner surface 201a of the fan casing 201 different from the longitudinal direction of the blade 202a, the total area where the linear convex portion 22a and the blade 202a face each other at the same time can be reduced overall, and the generation of loud noise can be avoided.

[0076] Furthermore, it is preferable that the linear convex portions 22a of the conductive portion 22 are provided on the inner surface 201a of the fan casing 201, limited to a half of the region on the blowing side of the airflow 45 from the fan casing 201. Specifically, it is preferable that the convex portions 22a of the conductive portion 22 are provided on the inner surface 201a of the fan casing 201, limited to a half of the region on the blowing outlet 14 side in a circumferential direction coaxial with the rotation direction of the fan 202. In other words, it is preferable that the convex portions 22a of the conductive portion 22 are provided on the inner surface 201a of the fan casing 201, limited to a half of the region on the blowing outlet 14 side in a circumferential direction coaxial with the central axis of the motor rotation shaft 203a of the motor 203.

[0077] As described above, fan 202 rotates clockwise around motor rotation shaft 203a of motor 203. Furthermore, a half area of ​​inner surface 201a of fan casing 201 on the air outlet 14 side in the circumferential direction coaxial with the rotation direction of fan 202 corresponds to the area of ​​inner surface 201a of fan casing 201 that corresponds to the range indicated by the arc-shaped double-headed arrow in FIG.

[0078] By forming the linear convex portions 22a of the conductive portion 22 on the inner surface 201a of the fan casing 201 within the above-described range, it is possible to suppress deterioration in the air-blowing performance of the blower 200, which would be caused by providing the linear convex portions 22a of the conductive portion 22 on the inner surface 201a of the fan casing 201. The linear convex portions 22a of the conductive portion 22 provided on the inner surface 201a of the fan casing 201 cause deterioration in the air-blowing performance of the blower 200. For this reason, in order to suppress deterioration in the air-blowing performance of the blower 200, it is preferable that the number of linear convex portions 22a of the conductive portion 22 be as small as possible.

[0079] Furthermore, a bell mouth 204 is provided on the surface of fan casing 201 facing front panel 12, which constitutes an intake port for blower 200, i.e., fan casing inlet 205, which is an intake port of the fan casing, and which guides the airflow that passes through dust collection unit 100 and heads toward fan 202 of blower 200. Airflow 45 that passes through electrostatic precipitator 120 and flows through an internal air path of air purifier 1 toward outlet 14 is taken into fan casing 201 from fan casing inlet 205. The air taken into fan casing 201 flows outside fan 202 within fan casing 201 from the scroll start point to the scroll end point in fan casing 201, and is blown out from an outlet of blower 200, i.e., fan casing outlet 206, which is an outlet of the fan casing, toward outlet 14 of housing 20.

[0080] Therefore, by forming the linear convex portions 22a of the conductive portion 22 on the inner surface 201a of the fan casing 201 in the limited range described above, which is closer to the scroll end point than the scroll start point, it is possible to make more of the air in the airflow 45 come into contact with the linear convex portions 22a of the conductive portion 22. This allows more positive ions contained in the airflow 45 to adhere to the conductive portion 22, and the positive ions can be efficiently discharged from the conductive portion 22.

[0081] (When conductive parts are formed on the fan) Next, a case where a conductive part is provided on fan 202 of blower 200 will be described. Fig. 13 is a diagram showing conductive part 23 provided on fan 202 included in air purifier 1 according to embodiment 1. Fig. 13 shows a state in which conductive part 23 is provided on part of fan 202 in Fig. 3. Note that for ease of understanding, Fig. 13 shows part of the view as a side view and some hatching is omitted. In air purifier 1, as shown in Fig. 13, conductive part 23 can be provided on the inner surface of fan 202 of blower 200. Fan 202 is a resin molded product that does not have electrical conductivity.

[0082] In air purifier 1, by providing conductive part 23, which is a conductive part, on the inner surface of fan 202 of blower 200, conductive part 23 can be formed at a location that is in frequent contact with the blown air, which is air flow 45 that passes through electrostatic precipitator 120 and flows through an air passage inside air purifier 1 toward air outlet 14. This allows air purifier 1 to attach positive ions contained in air flow 45 to conductive part 22, and to efficiently discharge the positive ions from conductive part 23.

[0083] Specifically, the conductive portion 23 is provided on the inner surface of the fan 202, which is a non-conductive resin molded product, that is, the inner surface of the non-conductive blades 202a and the inner surface of the non-conductive main plate 202b.

[0084] Furthermore, in air purifier 1, by providing conductive portion 23 only on the inner surface of fan 202 of blower 200, the amount of conductive material used in conductive portion 23 can be reduced.

[0085] Therefore, in the air purifier 1, by providing the conductive portion 23 only on the inner surface of the fan 202, it is possible to reduce the amount of conductive material used to form the conductive portion 23, while at the same time preventing, at low cost, contamination of the surface of the air purifier 1 and the wall surface 500 caused by charging of the air purifier 1, which occurs when positive ions contained in the air flow 45 flowing downwind from the electrostatic precipitator 120 inside the housing 10 adhere to the surfaces of the components of the air purifier 1, including the surface of the housing 10.

[0086] 13, it is preferable to electrically connect conductive portion 23 to ground wire 17. In FIG. 13, the electrical connection path electrically connecting ground wire 17 of air purifier 1 and conductive portion 23 is indicated by a medium-thick two-dot chain line. By electrically connecting conductive portion 22 to ground wire 17, conductive portion 23 is grounded, and positive ions discharged at conductive portion 23 are discharged to the earth through ground wire 17, thereby efficiently discharging positive ions charged in air purifier 1. This improves the reliability of the air purifier 1's effect of preventing contamination of the surface of air purifier 1 and wall surface 500 caused by charging of the air purifier 1.

[0087] The conductive part 23 can be grounded by electrically connecting the conductive part 23 to the earth wire 17 connected to the metal mounting bracket 400 via the metal blade boss 203b, the metal motor rotating shaft 203a, the metal bearing 203c, a conductive component (not shown) electrically connected to the bearing 203c and the mounting flange 203d in the motor 203, the metal mounting flange 203d, and the metal motor mounting plate 210. That is, the conductive part 23 is connected to the blade boss 203b and is electrically connected to the earth wire 17 via the motor rotating shaft 203a, the bearing 203c, the conductive component, the mounting flange 203d, and the motor mounting plate 210, thereby being grounded.

[0088] The conductive portion 23 is in contact with and electrically connected to a metal blade boss 203b. The fan 202 is fixed to a metal motor shaft 203a at the center of the fan 202 by the metal blade boss 203b, which penetrates the motor shaft 203a. The motor shaft 203a is in contact with and supported by a metal bearing 203c. The bearing 203c is electrically connected to a metal mounting flange 203d provided on the outer casing of the motor 203. In other words, the bearing 203c is electrically connected to the mounting flange 203d via a conductive component of the motor 203. The mounting flange 203d is in contact with and electrically connected to a metal motor mounting plate 210. 13, the motor mounting plate 210 penetrates the rear surface 10f of the housing 10 and is electrically connected to a mounting bracket 400 located between the wall surface 500 and the rear surface 10f. In addition, a ground wire 17 is connected to the mounting bracket 400.

[0089] Since conductive part 23 is electrically connected to earth wire 17 by the above-described conductive path, there is no need to provide an additional dedicated conductive material part for grounding conductive part 23, thereby reducing the manufacturing cost of air purifier 1. Therefore, by bringing conductive part 23 formed on fan 202 into contact with blade boss 203b, conductive part 23 can be grounded without providing an additional dedicated conductive material part.

[0090] Although the case where the conductive portion 23 is provided on the inner surface of the blade 202a and the inner surface of the main plate 202b has been described here, the conductive portion 23 may be provided on either the inner surface of the blade 202a or the inner surface of the main plate 202b. In this case, too, the conductive portion 23 may be configured to be electrically connected to the metallic blade boss 203b.

[0091] Furthermore, conductive portion 23 preferably has a convex shape. FIG. 13 shows conductive portion 23 having a convex shape with convex portion 23a protruding from flat portion 23b. Conductive portion 23 having a convex shape can have a larger surface area. Increasing the surface area of ​​conductive portion 23 increases the contact area between conductive portion 23 and the blown air, which is airflow 45 blown out into the room from air outlet 14. This increases the contact efficiency between conductive portion 23 and the blown air, increasing the probability that positive ions carried by the blown air will adhere to conductive portion 23. This allows conductive portion 23 to more efficiently discharge positive ions carried by the blown air, improving the long-term reliability of preventing contamination of the surface of air purifier 1 and wall surface 500 caused by charging of air purifier 1.

[0092] Here, the higher the height of the convex shape, the higher the contact efficiency between the conductive portion 23 and the blown air. On the other hand, if the height of the convex shape is too high, it will also lead to an increase in pressure loss of the blown air. For this reason, the convex shape is preferably a shape with multiple protrusions arranged like the inner wall of the small intestine, for example, so that the surface area of ​​the conductive portion 23 is large. In other words, the convex portion 23a is preferably a shape with multiple protrusions arranged like the inner wall of the small intestine, for example, so that the surface area of ​​the conductive portion 23 is large.

[0093] (Temporary shutdown of electrostatic precipitators) Next, control for temporarily stopping the operation of the electrostatic precipitator 120 during operation of the air purifier 1 will be described. By providing a temporary suspension period during operation of the air purifier 1, during which the operation of the electrostatic precipitator 120 is temporarily stopped, positive ions are discharged from the conductive portion into the air while the electrostatic precipitator 120 is stopped, thereby reducing the amount of charge on the air purifier 1. While the electrostatic precipitator 120 is stopped during operation of the air purifier 1, the airflow 45 that passes through the electrostatic precipitator 120 and flows through the internal air passage of the air purifier 1 and the airflow 45 blown out from the outlet 14 do not contain positive ions generated by corona discharge in the electrostatic precipitator 120. Therefore, an increase in the amount of charge on the housing 10 due to new positive ions contained in the airflow 45 adhering to the surfaces of the components of the air purifier 1, including the surface of the housing 10, does not occur.

[0094] Therefore, by providing a period during which the electrostatic precipitator 120 is temporarily stopped while the air purifier 1 is in operation, it is possible to reduce the amount of charge on the air purifier 1 caused by positive ions generated by corona discharge in the electrostatic precipitator 120. This reliably prevents contamination of the surface of the air purifier 1 and the wall surface 500 caused by charging of the air purifier 1 caused by positive ions contained in the air flow 45 flowing through the air passage from the electrostatic precipitator 120 to the air outlet 14 inside the housing 10 and in the air flow 45 blown out from the air outlet 14 adhering to the surfaces of the components of the air purifier 1, including the surface of the housing 10.

[0095] When the air purifier 1 is in operation, the electrostatic precipitator 120 is preferably temporarily stopped during times when there is no need to purify the indoor air, such as when no one is in the room or at night when there is little activity in the room. This prevents the problem of a decrease in the indoor air purification performance of the air purifier 1 due to the stopping of the electrostatic precipitator 120.

[0096] The temporary stopping of the electric precipitator 120 in the air purifier 1 is controlled by the control unit 310. Furthermore, the control of the temporary stopping of the electric precipitator 120 by the control unit 310 can be implemented by setting a time period during which the electric precipitator 120 is temporarily stopped in a timer.

[0097] In addition, the control unit 310 may temporarily stop the electrostatic precipitator 120 when the pollution concentration in the indoor air is detected by a pollution sensor while the air purifier 1 is operating, and the pollution concentration in the indoor air is lower than a predetermined concentration standard value.

[0098] In addition, the control unit 310 may control the temporary stopping of the electric dust collector 120 when a human presence sensor detects the presence of people in the room while the air purifier 1 is operating and detects that no one is present in the room.

[0099] Furthermore, when the humidity of the indoor air is relatively high, the surface resistance value, which is a characteristic of the conductive material, becomes relatively small, and the natural discharge of the conductive parts becomes relatively large, so the amount of charge on the air purifier 1 becomes relatively small, and the air purifier 1 and wall surface 500 are less likely to become soiled due to the attraction of dust caused by the charging of the air purifier 1. Conversely, when the humidity of the indoor air is relatively low, the surface resistance value, which is a characteristic of the conductive material, becomes relatively large, and the natural discharge of the conductive parts becomes relatively small, so the amount of charge on the air purifier 1 becomes relatively large, and the air purifier 1 and wall surface 500 are more likely to become soiled due to the attraction of dust caused by the charging of the air purifier 1.

[0100] Therefore, when the humidity of the indoor air in the room where air purifier 1 is installed is relatively low, the stop frequency, which is the frequency at which electrostatic precipitator 120 is stopped per predetermined unit time, can be set relatively high, thereby further reducing the amount of electrostatic charge in air purifier 1. This further improves the effect of preventing contamination of the surface of air purifier 1 and wall surface 500 caused by electrostatic charge in air purifier 1, which occurs when positive ions contained in air flow 45 flowing through the air passage from electrostatic precipitator 120 to air outlet 14 inside housing 10 and in air flow 45 blown out from air outlet 14 adhere to the surfaces of the components of air purifier 1, including the surface of housing 10.

[0101] Furthermore, when the humidity of the indoor air in the room where air purifier 1 is installed is relatively low, the amount of static electricity in air purifier 1 can be further reduced by setting a longer stop time, which is the time for stopping electrostatic precipitator 120 per predetermined unit time. This further improves the effect of preventing contamination of the surface of air purifier 1 and wall surface 500 due to static electricity in air purifier 1 caused by positive ions contained in air flow 45 flowing through the air passage from electrostatic precipitator 120 to outlet 14 inside housing 10 and in air flow 45 blown out from outlet 14 adhering to the surfaces of the components of air purifier 1, including the surface of housing 10.

[0102] Next, temporary stop control of the electric dust collector 120 in the air purifier 1 will be described. Fig. 14 is a diagram showing the functional configuration related to temporary stop control of the electric dust collector 120 in the air purifier 1 according to the first embodiment. The control unit 310 is connected to the operation unit 321, operation on / off switching timer 322, human presence sensor 323, dust sensor 324, and humidity sensor 325 provided in the air purifier 1, and controls the operations of these. Hereinafter, the operation on / off switching timer 322 may be simply referred to as timer 322.

[0103] The timer 322 measures the time period of the temporary suspension period during which the electrostatic precipitator 120 is temporarily stopped. Information about the set time of the temporary suspension period during which the electrostatic precipitator 120 is temporarily stopped, i.e., information about the set time of the time period during which the electrostatic precipitator 120 is temporarily stopped, is set in the timer 322 by the user via the operation unit 321. That is, information about the start time of the time period during which the electrostatic precipitator 120 is temporarily stopped and information about the end time of the time period during which the electrostatic precipitator 120 is temporarily stopped are set in the timer 322 by the user.

[0104] When the start time of the time period in which the electrostatic precipitator 120 is temporarily stopped arrives, timer 322 transmits start time arrival information to control unit 310 indicating that the temporary suspension start time has been reached. When the end time of the time period in which the electrostatic precipitator 120 is temporarily stopped arrives, timer 322 transmits end time arrival information to control unit 310 indicating that the temporary suspension end time has been reached.

[0105] The human presence sensor 323 detects the presence of a person in the room in which the air purifier 1 is installed. The human presence sensor 323 transmits information on the presence status of the person in the room, which is the detection result, to the control unit 310.

[0106] The control unit 310 temporarily stops the electrostatic precipitator 120 for a predetermined time when no one is present in the room, based on the detection result of the human presence sensor 323. That is, when the information about the presence status in the room received from the human presence sensor 323 indicates that no one is present in the room, the control unit 310 temporarily stops the electrostatic precipitator 120 for a predetermined time.

[0107] The dust sensor 324 is a pollution sensor that detects the pollution concentration of the indoor air in the room where the air purifier 1 is installed, and detects the dust concentration in the indoor air at a predetermined cycle. The dust sensor 324 transmits information on the dust concentration, which is the detection result, to the control unit 310.

[0108] When the dust concentration in the indoor air detected by the dust sensor 324 is equal to or lower than a predetermined dust concentration threshold, the control unit 310 temporarily stops the operation of the electrostatic precipitator 120 for a predetermined time. The dust concentration threshold is predetermined and stored in the control unit 310.

[0109] The humidity sensor 325 detects the humidity of the indoor air in the room where the air purifier 1 is installed at a predetermined cycle. The humidity sensor 325 transmits information on the humidity of the indoor air, which is the detection result, to the control unit 310.

[0110] When the humidity of the indoor air detected by the humidity sensor 325 is equal to or lower than a predetermined indoor humidity threshold, the control unit 310 extends the time for which the electrostatic precipitator 120 is temporarily stopped.

[0111] 15 is a flowchart showing an example of a procedure for temporarily stopping the electric precipitator 120 in the air purifier 1 according to the embodiment 1. In FIG. 15, an example of a procedure for temporarily stopping the electric precipitator 120 using the timer 322 is shown.

[0112] First, in step S110, the power supply of the air purifier 1 is turned on. When the power supply of the air purifier 1 is turned on, the control unit 310 starts the operation of the electrostatic precipitator 120. Then, the process proceeds to step S120.

[0113] In step S120, when the temporary stop start time, which is the start time of the time period during which the electrostatic precipitator 120 is temporarily stopped, arrives, the timer 322 transmits start time arrival information to the control unit 310 indicating that the temporary stop start time has been reached. The control unit 310 receives the start time arrival information. Then, the process proceeds to step S130.

[0114] In step S130, the control unit 310 temporarily stops the electrostatic precipitator 120. After that, the process proceeds to step S140.

[0115] In step S140, when the temporary stop end time, which is the end time of the time period during which the electrostatic precipitator 120 is temporarily stopped, arrives, the timer 322 transmits end time arrival information to the control unit 310, indicating that the temporary stop end time has been reached. The control unit 310 receives the end time arrival information. Then, the process proceeds to step S150.

[0116] In step S150, the control unit 310 resumes the operation of the electrostatic precipitator 120. Thereafter, when a new temporary suspension start time arrives, steps S120 to S150 are repeated.

[0117] Fig. 16 is a flowchart showing another example of the procedure for temporarily stopping the electric precipitator 120 in the air purifier 1 according to embodiment 1. Fig. 16 shows an example of the procedure for temporarily stopping the electric precipitator 120 using the timer 322 when humidity is low.

[0118] First, in step S210, the air purifier 1 is powered on. When the air purifier 1 is powered on, the control unit 310 starts the operation of the electrostatic precipitator 120. The control unit 310 also starts the operation of the humidity sensor 325. When the humidity sensor 325 starts its operation, it detects the humidity of the indoor air in the room where the air purifier 1 is installed at a predetermined cycle. The humidity sensor 325 then transmits the detected information on the humidity of the indoor air to the control unit 310. Then, the process proceeds to step S220.

[0119] In step S220, when the temporary stop start time, which is the start time of the time period during which the electrostatic precipitator 120 is temporarily stopped, arrives, the timer 322 transmits start time arrival information indicating that the temporary stop start time has been reached to the control unit 310. The control unit 310 receives the start time arrival information. Then, the process proceeds to step S230.

[0120] In step S230, the control unit 310 temporarily stops the electrostatic precipitator 120. After that, the process proceeds to step S240.

[0121] In step S240, it is determined whether the current humidity of the indoor air is low. Specifically, the control unit 310 determines whether the current humidity of the indoor air is low. The control unit 310 determines whether the current humidity of the indoor air is low based on the indoor air humidity information transmitted from the humidity sensor 325 and a predetermined indoor humidity threshold. The control unit 310 determines that the current humidity of the indoor air is low if the humidity of the indoor air is equal to or lower than the indoor humidity threshold. The control unit 310 determines that the current humidity of the indoor air is not low if the humidity of the indoor air is higher than the indoor humidity threshold. The indoor humidity threshold is, for example, 50% RH.

[0122] If it is determined that the current indoor air humidity is not low, the result in step S240 is No, and the process proceeds to step S250. In this case, control unit 310 transmits first humidity information indicating that the current indoor air humidity is not low to timer 322. If it is determined that the current indoor air humidity is low, the result in step S240 is Yes, and the process proceeds to step S270. In this case, control unit 310 transmits second humidity information indicating that the current indoor air humidity is low to timer 322.

[0123] In step S250, when the first end time, which is the end time of the time period during which the electrostatic precipitator 120 is temporarily stopped, arrives, the timer 322 transmits end time arrival information to the control unit 310 indicating that the temporary stop end time has arrived. That is, if the timer 322 has received the first humidity information, it transmits end time arrival information to the control unit 310 when the first end time arrives. The control unit 310 receives the end time arrival information. Then, the process proceeds to step S260.

[0124] In step S270, when the second end time, which is the end time of the time period during which the electrostatic precipitator 120 is temporarily stopped, arrives, the timer 322 transmits end time arrival information to the control unit 310 indicating that the temporary stop end time has arrived. That is, if the timer 322 has received the second humidity information, it transmits end time arrival information to the control unit 310 when the second end time arrives. The control unit 310 receives the end time arrival information. Then, the process proceeds to step S260.

[0125] The first end time is the end time of the time period in which the electrostatic precipitator 120 is temporarily stopped when the current indoor air humidity is not low, i.e., the temporary stop end time. The second end time is the end time of the time period in which the electrostatic precipitator 120 is temporarily stopped when the current indoor air humidity is low, i.e., the temporary stop end time. The second end time is later than the first end time. The first end time and the second end time are set on the timer by the user.

[0126] Alternatively, the user may set in the timer 322 only the information about the start time of the time period during which the electrostatic precipitator 120 is temporarily stopped. In this case, the timer 322 calculates a first end time by adding a predetermined first time to the start time of the time period during which the electrostatic precipitator 120 is temporarily stopped. The timer 322 also calculates a second end time by adding a predetermined second time to the start time of the time period during which the electrostatic precipitator 120 is temporarily stopped. The second time is longer than the first time.

[0127] In step S260, the control unit 310 resumes the operation of the electrostatic precipitator 120. Thereafter, when a new temporary suspension start time is reached, steps S220 to S260 are repeated.

[0128] (Conductive material for conductive parts) Next, the conductive material constituting the conductive portion will be described. FIG. 17 is a diagram illustrating an example of the conductive portion 24 included in the air purifier 1 according to the first embodiment. FIG. 17 shows the conductive portion 24, which is a conductive portion made of a metal plating film. FIG. 17 also shows a state in which the conductive portion 24 made of a metal plating film is formed on the surface of a component 30 of the air purifier 1 that is made of a resin material and is provided in an internal air passage of the air purifier 1 through which the air flow 45 that has passed through the electrostatic precipitator 120 flows. The component 30 is a resin product that does not have electrical conductivity. The conductive portion 24 is formed to cover a protruding portion 30a formed on the surface of the resin component 30, thereby forming a convex portion 24a. That is, the conductive portion 24 is formed in a shape having a convex shape that protrudes from a flat portion 24b of the conductive portion 24.

[0129] Conductive portion 24 is preferably a metal plating film, which is a thin metal film plated on the surface of resin component 30. Conductive portion 24 made of a metal plating film is formed on the surface of component 30, which is a component of air purifier 1 and made of a resin material. By using such a metal plating film to form conductive portion 24 in a part of the internal air passage of air purifier 1 through which air flow 45 flows after passing through electrostatic precipitator 120 as described above, the amount of metal material used to form conductive portion 24 can be reduced. This makes it possible to reduce the amount of expensive conductive material used, and thus reduce the cost of air purifier 1 when conductive portion 24 is provided in air purifier 1.

[0130] When the conductive portion 24 is made of a metal plating film, the increase in weight of the air purifier 1 due to the conductive portion 24 is smaller than when the conductive portion 24 is made of sheet metal, and it is possible to prevent the surface of the air purifier 1 and the wall surface 500 from becoming dirty due to static electricity while suppressing the increase in weight of the air purifier 1 due to the conductive portion 24.

[0131] Furthermore, when the conductive portion 24 is made of a metal plating film, the characteristics of the manufacturing method for the metal plating film make it possible to easily and uniformly cover the surface of the resin even if the shape is complex and difficult to process with sheet metal. As a result, for example, when the conductive portion 24 is provided on the louver 15, even if the louver 15 has a complex shape, the conductive portion 24 can be easily and uniformly formed on the surface of the louver 15.

[0132] FIG. 18 is a diagram illustrating an example of the conductive part 25 included in the air purifier 1 according to the first embodiment. FIG. 18 illustrates a conductive part made of a resin material containing carbon particles. FIG. 18 illustrates a state in which a component of the air purifier 1, which is provided in an internal air passage of the air purifier 1 through which the air flow 45 that has passed through the electrostatic precipitator 120 flows and is made of a resin material, is itself made of a resin material containing carbon particles and functions as a conductive part. The conductive part 25 has a convex shape formed by forming a convex part 25a protruding from a flat part 25b of the conductive part 25. That is, the conductive part 25 has a convex shape formed by forming a convex part on the surface of the component.

[0133] A carbon particle-mixed resin material can be used as the conductive material for conductive portion 25. In the carbon particle-mixed resin material, conductive particles 25d are mixed into non-conductive resin 25c. Carbon particles, for example, can be used as conductive particles 25d. When conductive portion 25 is formed from a carbon particle-mixed resin material, conductive portion 25 can be resin-molded together with louver 15, for example, so that louver 15 and conductive portion 25 can be molded into an integrally molded product. That is, conductive portion 25 in this case is a carbon particle-mixed resin-molded product provided in the air passage from electrostatic precipitator 120 to air outlet 14 inside housing 10.

[0134] In this case, the formation of the conductive parts becomes easier as additional processing is not required to form the conductive parts on the resin molded product of louver 15. In other words, when a carbon particle-mixed resin material is used as the conductive material for the conductive parts, the additional processing step of forming conductive parts 24 on the resin molded product, as in the case of forming conductive parts 24 by metal plating, is not required.

[0135] Furthermore, compared to surfactant-containing materials, which have surfactants arranged on the surface of the resin and distribute moisture in the air in the form of a film on the surface of the resin to achieve conductivity, carbon particle-incorporated resin materials are not dependent on the humidity environment and therefore can achieve high reliability.

[0136] Furthermore, when the humidity of the indoor air in the room where the air purifier 1 is installed is relatively low, the discharge current of the electric dust collector 120 can be reduced to suppress the amount of charge on the air purifier 1, thereby significantly improving the effectiveness of preventing dirt on the air purifier 1 and the wall surface 500.

[0137] As described above, when the humidity of the indoor air is relatively high, the surface resistance value, which is a characteristic of the conductive material, is relatively small, and the natural discharge of the conductive parts is relatively large, so the amount of charge on the air purifier 1 is relatively small, and the air purifier 1 and wall surface 500 are less likely to become soiled due to the attraction of dust caused by the charging of the air purifier 1. Conversely, when the humidity of the indoor air is relatively low, the surface resistance value, which is a characteristic of the conductive material, is relatively large, and the natural discharge of the conductive parts is relatively small, so the amount of charge on the air purifier 1 is relatively large, and the air purifier 1 and wall surface 500 are more likely to become soiled due to the attraction of dust caused by the charging of the air purifier 1.

[0138] For this reason, in the air purifier 1, it is preferable that the humidity sensor 325 measures the humidity of the indoor air, and the control unit 310 reduces the discharge current of the electrostatic precipitator 120 when the humidity of the indoor air is low. In the air purifier 1, when the humidity of the indoor air is equal to or lower than a predetermined indoor humidity threshold, it is preferable that the discharge current of the electrostatic precipitator 120 be relatively smaller than the predetermined discharge current threshold. Specifically, many conductive materials have a surface resistance value that increases when the humidity of the indoor air is around 50% RH. For this reason, in the air purifier 1, when the humidity of the indoor air is equal to or lower than 50% RH, it is preferable that the discharge current of the electrostatic precipitator 120 be relatively smaller than the predetermined discharge current threshold. Therefore, it is preferable that the indoor humidity threshold be set to 50% RH.

[0139] When the humidity of indoor air is low, the dust contained in the indoor air is also dry. Therefore, the ion charging efficiency of the dust passing through the discharge area 123 of the electrostatic precipitator 120 is high, and therefore the dust collection performance of the electrostatic precipitator 120 does not decrease significantly even if the discharge current of the electrostatic precipitator 120 is reduced.

[0140] The indoor humidity threshold here is a reference value of indoor humidity for the control unit 310 to determine whether the humidity of the indoor air is low or not. The indoor humidity threshold is determined in advance and stored in the control unit 310.

[0141] The discharge current threshold is a discharge current value of the electrostatic precipitator 120 that is set in advance for normal operation of the air purifier 1. Therefore, in the air purifier 1, when the humidity of the indoor air is 50% RH or less, the discharge current of the electrostatic precipitator 120 may be set to be smaller than the discharge current threshold that is set for normal operation. That is, when the humidity of the indoor air detected by the humidity sensor 325 is 50% RH or less, the control unit 310 may perform control to set the discharge current of the electrostatic precipitator 120 to be smaller than the discharge current threshold that is set for normal operation of the electrostatic precipitator 120.

[0142] When the control unit 310 controls the electric dust collector 120 to reduce the discharge current when the indoor air humidity is low, the humidity sensor 325 detects the humidity of the indoor air in the room where the air purifier 1 is installed at predetermined intervals. The humidity sensor 325 transmits information about the humidity of the indoor air, which is the detection result, to the control unit 310.

[0143] When the humidity of the indoor air detected by the humidity sensor 325 is equal to or lower than a predetermined indoor humidity threshold, the control unit 310 reduces the discharge current of the electrostatic precipitator 120 to less than the predetermined discharge current threshold.

[0144] As described above, the air purifier according to the first embodiment has the effect of preventing static electricity from building up on the installation surface while keeping costs down, and preventing the installation surface from becoming dirty due to dust adhering to the installation surface.

[0145] Next, a hardware configuration of the control unit 310 according to the first embodiment will be described. The functions of the control unit 310 according to the first embodiment are realized by a processing circuit. The processing circuit may be dedicated hardware, or may be a processing device that executes a program stored in a storage device.

[0146] When the processing circuit is dedicated hardware, the processing circuit may be a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an application specific integrated circuit, a field programmable gate array, or a combination thereof. Figure 19 is a diagram showing a configuration in which each function of the control unit 310 according to the first embodiment is realized by hardware. The processing circuit 311 incorporates a logic circuit 311a that realizes the functions of the control unit 310.

[0147] When the processing circuit 311 is a processing device, the functions of the control unit 310 are realized by software, firmware, or a combination of software and firmware.

[0148] FIG. 20 is a diagram illustrating a configuration in which each function of the control unit 310 according to the first embodiment is implemented by software. The processing circuit 311 includes a processor 3111 that executes a program 311b, a random access memory 3112 that the processor 3111 uses as a work area, and a storage device 3113 that stores the program 311b. The processor 3111 loads the program 311b stored in the storage device 3113 onto the random access memory 3112 and executes it, thereby realizing the functions of the control unit 310. The software or firmware is written in a programming language and stored in the storage device 3113. The processor 3111 may be, but is not limited to, a central processing unit. The storage device 3113 may be a semiconductor memory such as a random access memory (RAM), a read-only memory (ROM), a flash memory, an erasable programmable read-only memory (EPROM), or an electrically erasable programmable read-only memory (EEPROM). The semiconductor memory may be a non-volatile memory or a volatile memory. In addition to semiconductor memory, a magnetic disk, a flexible disk, an optical disk, a compact disk, a mini disk, or a DVD (Digital Versatile Disc) can be applied to storage device 3113. Processor 3111 may output data such as calculation results to storage device 3113 for storage, or may store the data in an auxiliary storage device (not shown) via random access memory 3112. By integrating processor 3111, random access memory 3112, and storage device 3113 on a single chip, the functions of control unit 310 can be realized by a microcomputer.

[0149] The processing circuit 311 realizes the functions of the control unit 310 by reading and executing the program 311b stored in the storage device 3113. It can also be said that the program 311b causes a computer to execute the procedures and methods for realizing the functions of the control unit 310.

[0150] The processing circuit 311 may be configured so that some of the functions of the control unit 310 are realized by dedicated hardware, and some of the functions of the control unit 310 are realized by software or firmware.

[0151] Thus, the processing circuitry 311 can realize the above-described functions by hardware, software, firmware, or a combination thereof.

[0152] The configurations shown in the above embodiments are merely examples, and may be combined with other known technologies, or the technologies described in the embodiments may be combined with each other, and some of the configurations may be omitted or modified within the scope of the gist of the invention.

[0153] Various aspects of the present disclosure are summarized below as appendices.

[0154] (Appendix 1) An air purifier that is installed on an installation surface in a room and purifies the air in the room, a non-conductive housing provided with an inlet for sucking in air and an outlet for blowing out the air; a blower housed in the housing, which generates an airflow that draws in the air through the air inlet and blows out the air through the air outlet; a discharge-type electrostatic precipitator housed in the housing to remove impurities from the airflow; a louver provided at the air outlet to adjust the direction of air blown out from the air outlet; Equipped with The louver has a conductive portion on a contact surface that is a surface that contacts the air blown out from the air outlet. An air purifier characterized by: (Appendix 2) the conductive portion is electrically connected to a low-potential electrode of the electrostatic precipitator; Attachment 1, an air purifier characterized by the above. (Appendix 3) the conductive portion is electrically connected to a ground; Attachment 1, an air purifier characterized by the above. (Appendix 4) the conductive portion is provided at a position on the contact surface of the louver that is on the inner side of the housing; 4. The air purifier according to claim 1, wherein the air purifier is a (Appendix 5) the conductive portion has a convex portion; 5. The air purifier according to any one of claims 1 to 4, (Appendix 6) The convex shape is formed by the rotation axis of the louver; 6. The air purifier according to claim 5, [Explanation of symbols]

[0155] 1 air purifier, 10 housing, 10a upper surface, 10b lower surface, 10c first side surface, 10d second side surface, 10e front surface, 10f rear surface, 11 housing body, 12 front panel, 13 intake port, 14 outlet port, 15 louver, 16 rotating shaft, 17 earth wire, 21, 22, 23, 24, 25 conductive part, 21a, 22a, 23a, 24a convex part, 21b, 22b, 23b, 24b, 25b flat part, 25a, 30a convex part, 25c resin, 25d conductive particles, 30 component parts, 45 air flow, 100 dust collecting part, 110 mesh filter, 120 electrostatic precipitator, 121 discharge part positive electrode, 122 discharge part negative electrode, 123 discharge area, 124 Dust, 130 deodorizing filter, 150 air passage wall, 200 blower, 201 fan casing, 201a inner surface, 201b inner surface, 201c inner bottom surface, 202 fan, 202a blade, 202b main board, 203 motor, 203a motor rotating shaft, 203b blade boss, 203c bearing, 203d mounting flange portion, 204 bell mouth, 205 fan casing intake port, 206 fan casing outlet, 210 motor mounting plate, 300 circuit portion, 301 high-voltage circuit board, 302 low-voltage circuit board, 303 sheet metal case, 310 control portion, 311 processing circuit, 311a logic circuit, 311b program, 321 operation portion, 322 operation on / off switching timer, 323 human sensor, 324 Dust sensor, 325 humidity sensor, 400 mounting bracket, 500 wall surface, 501 wall, 3111 processor, 3112 random access memory, 3113 storage device.

Claims

1. An air purifier that is installed on an installation surface in a room and purifies the air in the room, a non-conductive housing provided with an inlet for sucking in air and an outlet for blowing out the air; a blower housed in the housing, which generates an airflow that draws in the air through the air inlet and blows out the air through the air outlet; a discharge-type electrostatic precipitator housed in the housing to remove impurities from the airflow; a louver provided at the air outlet to adjust the direction of air blown out from the air outlet; Equipped with The louver has a conductive portion on a contact surface that is a surface that contacts the airflow blown out from the air outlet, the conductive portion is electrically connected to a low-potential electrode of the electrostatic precipitator; An air purifier characterized by:

2. An air purifier that is installed on an installation surface in a room and purifies the air in the room, a non-conductive housing provided with an inlet for sucking in air and an outlet for blowing out the air; a blower housed in the housing, which generates an airflow that draws in the air through the air inlet and blows out the air through the air outlet; a discharge-type electrostatic precipitator housed in the housing to remove impurities from the airflow; a louver provided at the air outlet to adjust the direction of air blown out from the air outlet; Equipped with The louver has a conductive portion on a contact surface that is a surface that contacts the airflow blown out from the air outlet, the conductive portion is electrically connected to a ground; An air purifier characterized by:

3. An air purifier that is installed on an installation surface in a room and purifies the air in the room, a non-conductive housing provided with an inlet for sucking in air and an outlet for blowing out the air; a blower housed in the housing, which generates an airflow that draws in the air through the air inlet and blows out the air through the air outlet; a discharge-type electrostatic precipitator housed in the housing to remove impurities from the airflow; a louver provided at the air outlet to adjust the direction of air blown out from the air outlet; Equipped with The louver has a conductive portion on a contact surface that is a surface that contacts the airflow blown out from the air outlet, the conductive portion has a convex shape having a convex portion protruding from a flat portion of the conductive portion; An air purifier characterized by:

4. An air purifier that is installed on an installation surface in a room and purifies the air in the room, a non-conductive housing provided with an inlet for sucking in air and an outlet for blowing out the air; a blower housed in the housing, which generates an airflow that draws in the air through the air inlet and blows out the air through the air outlet; a discharge-type electrostatic precipitator housed in the housing to remove impurities from the airflow; a louver provided at the air outlet to adjust the direction of air blown out from the air outlet; Equipped with The louver has a conductive portion on a contact surface that is a surface that contacts the airflow blown out from the air outlet, the conductive portion has a convex shape, The convex shape is formed by the rotation axis of the louver; An air purifier characterized by:

Images