JP6701741B2 - Air cleaner - Google Patents

Description

  The present invention relates to an air cleaner equipped with an electric dust collector.

  2. Description of the Related Art Some air purifiers that suck indoor air and remove dust from the sucked air include an electric dust collector. The electrostatic precipitator includes a charging unit that applies an electric charge to the dust to charge it, and a dust collecting unit that collects the charged dust. The charging unit charges the dust by corona discharge. The charging ability is determined by the current flowing between the electrodes. On the other hand, the dust collecting portion collects the dust charged by the electric field generated by the high voltage electrode by the collecting electrode. The dust collecting ability depends on the electric field strength. Therefore, in order to increase the dust collecting capability, it is necessary to supply a large current to the charging section and a high voltage to the dust collecting section.

  However, in an air purifier equipped with an electric dust collector, when the amount of dust contained in the sucked air is small, when operating under the same conditions as when the amount of dust is large, the amount of dust collected for power consumption is small, There is a problem that the operation efficiency of the air purifier, which is the amount of dust collected per unit power consumption, is not good. Therefore, when the amount of dust contained in the sucked air is small, it has been proposed to reduce the value of the current flowing through the charging unit (see, for example, Patent Document 1).

JP-A-2007-290577

  According to the control method of the air cleaner described in Patent Document 1, the dust collection capability (air passing through the air cleaner is changed by changing the value of the current flowing to the charging unit according to the amount of dust contained in the air. However, even if the amount of dust contained in the air is very small, the minimum current required for corona discharge between the electrodes must be applied. Therefore, there is a problem that the power consumption in the charging portion accounts for a large proportion of the power consumption of the entire air cleaner.

  Then, this invention is made|formed in view of the said problem, and an object of this invention is to provide the air cleaner which can reduce the power consumption at the time of operation|movement when the dust concentration in air is very small.

The present invention has been proposed to achieve the above object, and the invention of claim 1 is an air cleaner, which charges a fan and dust contained in the air taken into the inside by the fan. A charging unit, a dust collecting unit that collects dust charged by the charging unit, a first power supply unit that supplies power to the charging unit, and a second power supply unit that supplies power to the dust collecting unit. When the a first power supply unit and control unit for controlling the second power supply unit, and a dust detector for detecting dust concentration in the air, the control unit, the dust concentration in the air in advance When the electric power is not supplied to the charging unit and the electric power is not supplied to the dust collecting unit when the threshold value is equal to or less than the predetermined threshold , the first power supply unit and the second power supply unit are controlled.

According to a second aspect of the present invention, in the air cleaner according to the first aspect, the charging section is divided into two or more, and the first power supply section individually supplies electric power to the two or more charging sections. The control unit determines the number of the charging units to be operated according to the dust concentration in the air when the dust concentration exceeds the threshold value, and individually for the determined number of charging units. The first power supply unit is controlled to supply electric power.

  According to a third aspect of the present invention, in the air purifier according to the first or second aspect, the control unit minimizes the air volume of the blower when the dust concentration detected by the dust detection unit is equal to or less than a threshold value. It is characterized by controlling to.

  According to the present invention, it is possible to provide an air cleaner and a control method thereof that can reduce the power consumption of the charging unit during operation when the dust concentration is equal to or lower than a predetermined threshold value.

It is a schematic block diagram of the air cleaner which concerns on embodiment of this invention. It is a schematic block diagram of the electrostatic precipitator which concerns on embodiment of this invention. It is a flow chart which shows the control procedure of the air cleaner concerning the embodiment of the present invention. It is a graph which shows the characteristic of the electrostatic precipitator concerning an embodiment of the present invention. It is a graph which shows the dust collection performance of the air cleaner concerning the embodiment of the present invention. It is a schematic block diagram of the electrostatic precipitator which concerns on a reference example.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. The same elements will be denoted by the same reference symbols throughout the description of the embodiments.

  FIG. 1 is a schematic configuration diagram of an air cleaner according to an embodiment of the present invention, and FIG. 2 is a schematic configuration diagram of an electrostatic precipitator according to an embodiment of the present invention. As shown in FIG. 1 and FIG. 2, the air purifier 1 includes an intake port 2 that sucks indoor air, a prefilter 3 that removes large dust from the sucked air, and an air that has passed through the prefilter 3. A plurality of electric dust collectors 4 for collecting the above dust, a deodorizing filter 5 for deodorizing the air passing through the electric dust collector 4, and a fan 6 (blower) arranged on the downstream side of the deodorizing filter 5. A fan motor 7 for rotating the fan 6, an outlet 8 for blowing air cleaned by the pre-filter 3, the electric dust collector 4 and the deodorizing filter 5 into the room, and control for controlling the electric dust collector 4 and the fan motor 7. The power supply control board 9 having the unit 93, the charging unit high-voltage power supply 10 (charging power supply unit) that supplies power to the charging unit 41 of the electrostatic precipitator 4, and the dust collecting unit 42 of the electric precipitator 4 have electric power. The high-voltage power supply 11 for dust collection part (power supply part for dust collection), the operation display board 12 that performs operation start operation, operation stop operation, air volume setting, and the like, and the dust concentration of the air sucked from the suction port 2 And a dust sensor 13 (dust detecting means) for detecting. The charging unit high voltage power supply 10 supplies electric power individually to the charging unit 41 included in each of the plurality of electrostatic precipitators 4, that is, the plurality of charging units 41. Power is supplied to the charging unit high voltage power supply 10. What is done is the power supply unit 94 of the present invention.

  Then, the air purifier 1 sucks the indoor air from the suction port 2 by the rotation of the fan 6 driven by the fan motor 7, and passes the air while passing through the pre-filter 3, the electrostatic precipitator 4, and the deodorizing filter 5. The air is cleaned and blown into the room through the air outlet 8.

  The air cleaner 1 of the present embodiment includes three electric dust collectors 4, but the number of the electric dust collectors 4 is not limited to three, and may be two. It may be four or more. Further, in setting the air volume of the air cleaner 1, a manual air volume setting for manually switching the air volume based on the operation of the operation display board 12, a detection signal of the dust sensor 13, a dust threshold value 1 and a dust threshold value stored in advance. 2 (dust threshold 1<dust threshold 2) is compared, and there is automatic air volume setting for automatically switching to an appropriate air volume, and either one can be selected.

  As shown in FIG. 2, the electrostatic precipitator 4 includes a charging unit 41 and a dust collecting unit 42. The charging unit 41 includes a charging unit discharge electrode 41a having a thin or sharp shape such as a wire and a needle, and a flat charging unit counter electrode 41b having a polarity different from that of the charging unit discharge electrode 41a with a predetermined space. Are alternately arranged. The dust collecting portion 42 has a structure in which a large number of flat plate electrodes are arranged in parallel and electrically connected so that high voltages having different polarities are alternately applied, and the dust collecting portion 42 has the same polarity as the charging portion discharge electrode 41a. The high voltage electrode 42b and the opposite electrode 41b of the charging unit have the same polarity as the dust collecting unit collecting electrode 42a.

  A high voltage is applied to the discharge electrode 41a and the counter electrode 41b of the charging unit 41 from the commercial power supply 14 via the power supply unit 94 by the charging unit high-voltage power supply 10. The charging unit high-voltage power supply 10 is driven and controlled by the control unit 93 mounted on the power supply control board 9 via the charging unit switches 91a, 91b, and 91c.

  A high voltage is applied to the collecting electrode 42a and the high-voltage electrode 42b of the dust collecting portion 42 from the commercial power supply 14 through the power supply portion 94 by the dust collecting portion high-voltage power supply 11. The dust collector high-voltage power supply 11 is driven and controlled by the controller 93 mounted on the power supply control board 9 via the dust collector switch 92.

  The same number of high-voltage power supplies 10 for charging units as the number of built-in electrostatic precipitators 4 are provided and are connected to the charging units 41 of each electrostatic precipitator 4 in a one-to-one correspondence. There is one high-voltage power source 11 for the dust collecting section regardless of the number of built-in electric dust collecting apparatuses 4, and all the dust collecting sections 42 are connected in parallel.

  Next, a dust collecting function in the electric dust collector 4 will be described.

  When a high voltage of the positive electrode is applied to the charging portion discharge electrode 41a of the charging portion 41 and the charging portion counter electrode 41b is connected to the ground electrode of the charging portion high voltage power source 10, corona discharge occurs, and electrons are generated between these electrodes. The air molecules are filled with positively charged ions. Of these, the electrons reach the charging section discharge electrode 41a and flow toward the charging section high-voltage power supply 10. If the current in the entire charging unit 41 at this time is 0.025 mA, the ions corresponding to this current value are filled between the electrodes. Further, the shape of the charging part discharge electrode 41a, for example, in the case of a wire shape, the wire diameter is set to 0.1 mm so that the voltage that stably causes the corona discharge so that the current becomes 0.025 mA falls below 5 kV. It is possible to set.

  When the dust passes through the space filled with the positive ions, the charge due to the collision between the ions and the dust is generated depending on the passing time and the strength of the electric field generated by the charging portion discharge electrode 41a and the charging portion counter electrode 41b. Movement occurs and dust is charged with a positive charge.

  On the other hand, when, for example, 5 kV is applied to the dust collecting portion high voltage electrode 42b of the dust collecting portion 42 and the dust collecting portion collecting electrode 42a is connected to the ground electrode of the dust collecting portion high voltage power supply 11, the distance between both electrodes is 2 mm. For example, an electrostatic field of 25 kV/cm is formed. When the dust positively charged by the charging unit 41 moves to the dust collecting unit 42, a force is applied to the dust collecting unit collecting electrode 42a having a polarity opposite to that of the dust by the electrostatic field.

  The dust floating in the air immediately reaches the terminal velocity due to the air resistance and becomes a constant velocity motion having a velocity component in the flow direction and a velocity component in the dust collecting portion collecting electrode 42a direction. The velocity component in the direction of the dust collecting portion collecting electrode 42a is proportional to the amount of electric charge of dust and the electric field strength, and within the passage time of the dust collecting portion 42 determined by the velocity in the flow direction and the depth of the dust collecting portion 42, The dust that has reached the collection electrode 42a is collected. Since the dust floating in the air is sufficiently small and is affected by diffusion, some dust moves in a direction away from the dust collecting portion collection electrode 42a, and all dust is trapped while passing through the dust collecting portion 42. Although not collected, the amount of dust that passes through the dust collecting section 42 without being collected decreases exponentially with the passage of time.

  Here, one of the methods for increasing the collection rate is to increase the charge amount of dust and increase the number of ions in the charging section 41. In order to obtain a stable dust collecting ability, the charging high-voltage power supply 10 is required to have a characteristic that the high voltage of the positive electrode applied to the charging part discharge electrode 41a is kept constant.

Another method of increasing the collection rate is to increase the strength of the electric field of the dust collecting part 42, which is as high as possible within the range where abnormal discharge does not occur, and the dust collecting part high voltage electrode 42b and the dust collecting part collecting electrode 42a are In order to maintain the potential difference between them, the dust collection high-voltage power supply 11 is required to have a characteristic of keeping the output voltage constant. Further, since the dust concentration of the air processed by the home air cleaner is as low as 0.1 mg/m ³ , for example, the current flowing due to the charge amount of the dust collected by the dust collecting unit 42 is small, The current capacity of the high voltage power supply 11 may be small, for example, 0.01 mA.

The processing air volume required in a home air cleaner, for example, ^{3 to} 8 m ³ /min, can be accommodated by incorporating 1 to 3 electrostatic precipitators 4 corresponding to the above-mentioned high voltage power source 10 for the charging section. However, the present invention is not limited to this, and the number of the electrostatic precipitators 4 may be appropriately changed depending on the required capacity of the air cleaner such as four or more. Alternatively, two or more charging units 41 may be provided, only one dust collecting unit 42 may be provided, and the plurality of charging units 41 may be arranged on the windward side of the dust collecting unit 42.

  Next, the control procedure of the air cleaner 1 of the present invention will be described using the control flow of FIG.

  FIG. 3 is a flowchart showing a control procedure of the air cleaner according to the embodiment of the present invention. As shown in FIG. 3, the control unit 93 mounted on the power supply control board 9 is operated by an operation switch (not shown) provided on the operation display board 12 of the air cleaner 1 to start a plurality of dust collecting operations. The high voltage power source 11 for the dust collecting section, which supplies power to all the sections 42 in common, is set to ON (S11).

  Next, it is determined whether the air volume setting is manual or automatic (S12). Here, when it is determined that the air volume setting is manual, it is determined which of the large, medium, and small air volumes is selected (S13, S14), and the air volume setting variable is set in accordance with the determination result. Large, medium and small are set (S15, S16, S17). On the other hand, when it is determined that the air volume setting is automatic, a signal from the dust sensor 13 arranged near the suction port 2 and two preset dust thresholds (dust threshold 1 and dust threshold 2) are set. A comparison is made (S18, S19), and one of large, medium, and small air volumes is selected according to the dust concentration, and large, medium, and small are set in the air volume setting variable according to the determination result ( S15, S16, S17).

  After the air volume is set, the fan motor 7 is driven at the number of rotations according to the air volume setting, and the fan 6 generates the set air volume. Further, when the air volume is set to be large manually or automatically, all the plurality of charging unit high voltage power supplies 10 are turned on (S20). Further, when the air volume is manually or automatically set to medium, some of the plurality of charging unit high voltage power supplies 10 are turned on (S21). For example, one out of three or two out of three is turned on. Further, when the air volume is set to be small manually or automatically, all of the plurality of charging unit high voltage power supplies 10 are kept off.

  When a part of the plurality of charging unit high voltage power supplies 10 is turned on, a plurality of charging unit high voltage power supplies 10 are not always turned on but a plurality of charging unit high voltage power supplies 10 are not always turned on. It is preferable to uniformly turn on the high voltage power supply 10 for the charging section. That is, since the charging portion discharge electrode 41a of the charging portion 41 having a thin or sharp shape such as a wire or a needle has a life, the charging portion to be driven so that the driving time of each charging portion high voltage power source 10 becomes equal. By selecting the high-voltage power supply 10 for use and turning on the selected one, it is possible to extend the life of the device as a whole. As a method of uniformly turning on the plurality of charging unit high voltage power supplies 10, a method of turning on the plurality of charging unit high voltage power supplies 10 in a predetermined order, or a method of turning on the plurality of charging unit high voltage power supplies 10 in the past. There is a method of storing the ON time and turning ON the plurality of high voltage power supplies 10 for the charging unit so that the past ON times are equalized.

  Until the operation is stopped by the operation switch (S22:N), the manual change of the air volume setting and the automatic change of the air volume setting based on the signal of the dust sensor 13 are monitored to detect the changed air volume. According to the above, the number of rotations of the fan motor 7 and the number of the charging unit high-voltage power supplies 10 to be turned on or off are controlled.

  When the operation is stopped by the operation stop switch (S22:Y), the high voltage power source 10 for the charging unit is turned off (S23), the high voltage power source 11 for the dust collecting unit is turned off (S24), and the air volume setting variable is stopped. Is set (S25), and the rotation speed of the fan motor 7 is set to zero.

  In the flowchart shown in FIG. 3, only the air volume and the control of the electrostatic precipitator 4 are described, but the display control of the amount of dirt by the signals of the deodorizing filter 5 and the dust sensor 13, the control by the signal of the odor sensor (not shown), etc. There is no limit. Further, the setting of the air volume is not limited to the three levels of small, medium and large. Further, the signal threshold of the dust sensor 13 is not limited to two. Further, the ON/OFF sequence of the charging unit 41 and the dust collecting unit 42, and the large, medium, and small air volume setting sequence are not limited to the flowchart shown in FIG.

  Next, the charging part current characteristics of the electrostatic precipitator 4 will be described with reference to FIG.

  FIG. 4 is a graph showing the characteristics of the electrostatic precipitator 4 according to the embodiment of the present invention. In FIG. 4, a wire having a diameter of 0.12 mm is used as the charging part discharge electrode 41a, and a metal plate having a width of 10 mm is arranged as the charging part counter electrode 41b at an interval of 6.25 mm, and a depth of 34 mm is set in the dust collecting part 42 at an interval of 2 mm. In the electric dust collector 4 in which a large number of dust collecting portion collecting electrodes 42a and a plurality of dust collecting portion high voltage electrodes 42b are arranged, the transmittance of atmospheric dust having a particle diameter of 0.3 to 0.5 μm is shown. The two symbols correspond to the wind speed vx in the flow direction of the dust collector 42. The horizontal axis represents the charging portion current, and the vertical axis represents the transmittance (=outlet particle concentration/inlet particle concentration).

  According to FIG. 4, it can be seen that the transmittance decreases as the charging portion current increases, and that the transmittance decreases as the wind speed vx decreases. Further, when the charging portion current is 0, the transmittance at wind speed vx3.75 m/s exceeds 90%, whereas the transmittance at wind speed vx0.74 m/s is in the range of 60%. . The wind speed vx is the wind speed of the air passing through the electrostatic precipitator 4 when the air purifier is operated at the maximum air volume (rated air volume).

  Atmospheric dust includes those that are charged from the beginning, and the amount of charge (=the amount of charge) per dust is small, so there are few that can be collected by the dust collecting part 42 at high wind speed vx. When the wind speed vx is low, more can be collected.

  Most of the electric power of the electrostatic precipitator 4 is consumed by the charging section 41 and very little is consumed by the precipitator 42. Therefore, when the wind speed vx is low, only the high-voltage power source 11 for the precipitator is used. By turning on, it is possible to provide a dust collecting capability with a small amount of electric power.

  Further, when the wind speed vx is low, it is difficult to further reduce the transmittance even if the charging portion current is increased, and it is inefficient to drive with a large charging portion current. Although it is possible to improve the efficiency by designing the charging high-voltage power supply 10 to have a variable current, there is a drawback in that the structure of the power supply is complicated and expensive. Further, when the wind speed vx is small, that is, when the air volume is small, it can be considered that the amount of dust is small in automatic operation or that fast dust collection is not desired by manual setting, so that the dust collection capacity is unnecessarily high. You don't have to drive in. In some conventional air cleaners, control is performed to stop the operation of the electrostatic precipitator itself under this condition.

  However, when the high voltage power supply 10 for the charging unit and the high voltage power supply 11 for the dust collecting unit are provided independently as in the present invention, when the wind speed vx is low, that is, when the air volume is small, the high voltage for the dust collecting unit is low. If only the power supply 11 is turned on, the dust can be reliably collected compared to when the electric dust collector 4 itself is stopped. Hereinafter, this effect will be described with reference to FIG.

  FIG. 5 is a graph showing the dust collecting ability of the air purifier 1 according to the embodiment of the present invention. FIG. 5 shows that when the air purifier having two built-in electric dust collectors 4 is operated at the rated air volume, 1/2 of the rated air volume and 1/5 of the rated air volume, while changing the number of ON of the charging unit 41. It is the result of measuring the collection rate.

  “All charged” is for turning on two of the two charging portions 41, “partially charged” is for turning on one of the two charging portions 41, and “not charged” is for two charging portions 41. Two of them are turned off to drive the high voltage power supply 10 for the charging section. The horizontal axis represents the air flow rate of each electrostatic precipitator 4, and the vertical axis represents the collection rate (=1-permeability).

  The collection rate is highest when "all charged", and lowest when "no charge". Similar results are obtained when the number of built-in electrostatic precipitators 4 is three or one. According to the description of the control flow of FIG. 3, the air volume setting: small can correspond to ⅕ of the rated air volume, air volume setting: medium to ½ of the rated air volume, and air volume setting: large can correspond to the rated air volume.

  Similar to the characteristics of the wind speed vx and the charging part current in FIG. 4, the increase rate of the collection rate is small when the air volume is small when “all charged”, and is large when the air volume is “no charge”. Although the rate is 10% or less, it can be seen that the collection rate exceeds 30% when the air volume is small.

  Next, the dust collecting ability, the electric power, and the efficiency defined as the ratio thereof will be described while comparing the embodiment with the reference example.

  FIG. 6 is a schematic configuration diagram of an electrostatic precipitator according to a reference example. In the electric dust collector of the air cleaner according to the reference example, a common high-voltage power supply 115 is connected to the charging unit 141 and the dust collector 142, and the switches 191a and 191b in the power control board 109 are provided for each electric dust collector 104. , 191c.

  This example is a two-stage type electrostatic precipitator, but the control is similar to that of the one-stage type precipitator in which the charging section and the dust collecting section are integrated. Although there is an advantage that the number of types of the high-voltage power supply 115 can be reduced, the charging unit 141 drives a constant current power supply, and the dust collecting unit 142 drives a power supply having different desired characteristics, such as a constant voltage power supply, by a common output to drive at different potentials. However, there is a disadvantage in that it is impossible to do so, and there is a possibility that an unnecessary high current may flow through the dust collecting portion 142.

Table 1 below shows a comparison between the dust collection capacity, the electric power, and the efficiency defined as the ratio between the example and the reference example in the present embodiment.

  Here, the dust collection capacity is the product of the air volume and the collection rate, and represents the amount of air that can be cleaned per minute. The electric power is 1.41 W for each charging unit 41 and 0.0047 W for each dust collecting unit 42, and is calculated as an average for each electric dust collecting device 4. The efficiency is the ratio of the dust collection capacity to the electric power, and is the value of the dust collection capacity per 1 W of electric power. In the embodiment, the charging unit 41 is controlled in three stages of air volume setting according to the control flow of FIG. "Partially charged" corresponds to one of the two being ON. In the reference example, the charging unit 141 and the dust collecting unit 142 share the high-voltage power supply 115, and are set to OFF when the air volume setting is small and ON when the air volume setting is medium and large.

  When the air volume setting is large, the efficiency is the same because the conditions are the same in the embodiment and the reference example. When the air flow rate is set to medium, compared with the partially charged embodiment, the reference example of all charging has a higher dust collecting ability, but in the embodiment, since the dust collecting ability does not decrease as much as the decrease in power, The efficiency of the example is higher than that of the reference example. However, when the air volume is set to a large value, the smaller the air volume, the lower the dust collection capacity, which is the product of the air volume and the collection rate, and the lower the efficiency. This is because the electric power related to the blowing is not added.

  When the air volume setting is small, the dust collection capacity is 0 and the power is 0 in the reference example, and the efficiency cannot be calculated. In the embodiment, the efficiency is insignificantly larger than that in the case of other air volume settings. Although the absolute value of the dust collecting ability is small, it can be said that the ability expected when the air volume is small is more effective than the reference example. It should be noted that the charging corresponding to medium air volume setting is not limited to "charging portion partly ON", but "charging portion all ON" may be selectable, such as energy saving operation and strong dust collecting operation. There is also a method in which the expression is left to the user's choice.

  According to the air cleaner 1 of the present embodiment described above, according to the dust concentration in the air, only the charging unit 41 to be operated is energized among the plurality of charging units 41, and the dust concentration in the air is Since the power supply unit 94 is controlled so as not to supply the electric power to any of the plurality of charging units 41 when the dust concentration in the air is equal to or lower than the predetermined threshold value (weak operation ) Time can be reduced.

  Further, the dust collecting unit 42 has a higher collecting performance as the air volume of the fan 6 is smaller, and it is possible to collect dust in the charged atmosphere, so that all the charging units 41 can be operated during a weak operation. Even if it is stopped, by continuing the operation of the dust collecting part 42, it is possible to maintain the required dust collecting performance.

  In addition, except during the weak operation, the number of the charging units 41 to be operated is determined according to the dust concentration in the air, and the charging unit high-voltage power supply 10 is energized so as to energize this number of charging units 41. Since the control is performed, it is possible to adjust the dust collecting capability of the entire air cleaner 1 based on the number of operating charging units 41 without lowering the current value of the operating charging units 41, and as a result, it is possible to adjust the required dust collection capability. It is possible to reduce the power consumption and improve the operation efficiency of the air cleaner while ensuring the dust capacity.

  Further, the air purifier 1 further includes a high voltage power supply 11 for dust collecting section that supplies electric power to the dust collecting section 42, the dust collecting section 42 is divided into two or more, and the high voltage power supply 11 for dust collecting section is Since power is supplied to all of the two or more dust collecting units 42, it is possible to supply power to a plurality of dust collecting units 42 with a single power source for the dust collecting units 42 with low power consumption. Power supply complexity can be avoided.

  Further, since the air purifier 1 controls the air volume of the fan 6 in accordance with the dust concentration detected by the dust sensor 13, when the dust concentration in the air is high, the air volume of the fan 6 is increased while increasing the air volume. Not only is it possible to operate the charging section 41 of No. 1 to perform highly efficient dust collecting operation, but when the dust concentration in the air is low, some of the charging sections 41 are operated while reducing the air volume of the fan 6. Alternatively, all the charging sections 41 can be made non-operational to perform a power-saving dust collecting operation.

  Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications within the scope of the gist of the present invention described in the claims. It can be changed.

  DESCRIPTION OF SYMBOLS 1... Air purifier, 10... High voltage power supply for charging part, 11... High voltage power supply for dust collecting part, 12... Operation display board, 13... Dust sensor, 14... Commercial power supply, 3... Prefilter, 4... Electrostatic precipitator , 41... Charging part, 41a... Charging part discharging electrode, 41b... Charging part counter electrode, 42... Dust collecting part, 42a... Dust collecting part collecting electrode, 42b... Dust collecting high voltage electrode, 5... Deodorizing filter, 6... Fan, 7... Fan motor, 8... Air outlet, 9... Power control board, 91a, 91b, 91c... Charging section switch, 92... Dust collecting section switch

Claims (3)

An air purifier,
A blower ,
A charging unit for charging dust contained in the air taken in by the blower,
A dust collecting portion for collecting the dust charged by the charging portion,
A first power supply unit for supplying electric power to the charging unit;
A second power supply unit for supplying electric power to the dust collecting unit;
A control unit that controls the first power supply unit and the second power supply unit ;
And a dust detector for detecting dust concentration in the air,
Wherein, when the threshold value or less dust concentration in the air is determined in advance, while supplying no power to the charging unit, for supplying power to the dust collection unit, the first power supply portion and the second An air purifier characterized by controlling two power supply units . The charging unit is divided into two or more, the first power supply unit supplies power individually to the two or more charging units, and the control unit determines when the dust concentration exceeds the threshold value. According to the dust concentration in the air, the number of operating charging units is determined, and the first power supply unit is controlled to individually supply power to the determined number of charging units. The air purifier according to claim 1. The air cleaner according to claim 1 or 2, wherein the control unit controls the air volume of the blower to be minimum when the dust concentration detected by the dust detection unit is equal to or less than a threshold value.

Images