JP2006015197A - Air cleaner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air cleaner capable of automatically forming an operation pattern corresponding to sleeping time, i.e., a period of time with small contamination of air, and the like, and executing the operation to meet a life pattern. <P>SOLUTION: This air cleaner is provided with a gas detection unit 5, a dust detection unit 6 and a light detection unit 8 for detecting the brightness in a room, which units are provided in a body 1, and an operation wind volume determined on the basis of the contamination level of air detected by the gas detection unit 5 and the dust detection unit 6 is further controlled on the basis of the detection level of the light detection unit 8, and the operation wind volume during nighttime such as sleeping time is decreased to lower operation sound of the air cleaner. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an air purifier that detects indoor air contamination with a dust sensor and a gas sensor, and that a controller drives a blowing means to suck in indoor air and cleans it through a purifying means.

  Conventionally, this type of air purifier is known as described below.

  Hereinafter, the air cleaner will be described with reference to FIGS. 8 and 9. As shown in the figure, the air cleaner main body 101 is provided with a front panel 102, a filter 104 for purifying the air, a motor 105 that ventilates the filter 104, and a control unit that controls the operation of the motor 105. 106 is provided. Further, an optical dust sensor 107 that detects indoor air contamination is provided on the side surface of the main body 101, and a gas sensor 108 that detects air contamination is provided on the front surface of the main body 101.

  In the above configuration, when the dust sensor 107 or the gas sensor 108 detects dirt, the control unit 106 changes the ventilation rate by changing the rotation speed of the fan motor 105 according to the magnitude of the signal from the dust sensor 107 or the gas sensor 108. A cleaning operation corresponding to dirt in the room is performed (for example, see Patent Document 1).

In addition, in the case of having an automatic intermittent operation function, the fan motor 105 is intermittently driven to draw room air, and the dust sensor 107 and the gas sensor 108 efficiently detect atmospheric dirt. (For example, see Patent Document 2)
Japanese Patent No. 2758655 JP-A-10-122615

  In such a conventional air purifier, even if you are sleeping at night, if the dust sensor or gas sensor detects air dirt, it operates with the specified operating air volume, so there is a problem that the driving sound becomes high and noisy Even when air pollution occurs during the night, such as when sleeping, it is required to drive quietly to remove the dirt.

  In addition, even in the time zone where air pollution is difficult to occur, a clean environment can be maintained by continuing intermittent operation periodically, but there is a problem that it can be a noise source in quiet time zones such as midnight, During times when air pollution does not occur, it is required to change the operation method to achieve energy saving and low noise operation.

  Also, when bringing in dirt from outside such as when returning home, there is a problem that it is necessary to change the operation mode by operating manually because it is necessary to increase the air volume and collect dirt quickly. It is required to operate with air volume and collect dirt.

  The present invention solves such a conventional problem. In a quiet environment such as sleeping, the present invention is driven with low noise, and the time zone in which the possibility of contamination due to a living scene is low is a clean environment. The purpose of the present invention is to provide an air cleaner that suppresses noise more than the operation that maintains the airflow and that collects dust at a stretch by driving with a large air volume when returning home.

  In order to achieve the above object, an air cleaner according to the present invention has an air inlet provided in a main body, a purifying means for cleaning dirty air sucked from the air inlet, an air blowing means for passing air through the purifying means, an air A dirt detecting means for detecting a dirt component in the interior, a brightness detecting means for detecting the brightness of the room, and a control unit for controlling the air volume of the blowing means by a detection signal from the dirt detecting means and the brightness detecting means. And the control unit lowers the air volume of the air blowing means determined from the signal from the dirt detecting means, and the air volume of the air blowing means when the detection signal from the brightness detecting means detects LOW. It is what I did.

  By this means, an air purifier can be obtained which can be operated silently to remove dirt even when air dirt occurs at night such as sleeping.

  In order to achieve the above object, the air purifier of the present invention has an air inlet provided in the main body, a purifying means for purifying dirty air sucked from the air inlet, and a blowing means for ventilating the purifying means. , A dirt detecting means for detecting dirt components in the air, a brightness detecting means for detecting the brightness of the room, and the air volume of the blowing means is controlled by detection signals from the dirt detecting means and the brightness detecting means. A control unit, which converts the signal from the dirt detection means and stores it as a dirt level value for 24 hours in a time series, and detects the stored dirt level value and the brightness detection means. The signal is calculated to control the air volume of the air blowing means in time series.

  By this means, an air purifier can be obtained which can be operated silently to remove dirt even when air dirt occurs at night such as sleeping.

  In order to achieve the above object, the air purifier of the present invention has an air inlet provided in the main body, a purifying means for purifying dirty air sucked from the air inlet, and a blowing means for ventilating the purifying means. And a dirt detecting means for detecting dirt components in the air, and a control section for controlling the air volume of the blower means by a detection signal from the dirt detecting means, wherein the control section is based on a detection signal from the dirt detecting means. It has an operation switch which can lower the air volume of the blowing means determined in the previous period.

  By this means, an air purifier can be obtained which can be operated silently to remove dirt even when air dirt occurs at night such as sleeping.

  In order to achieve the above object, the air purifier of the present invention has an air inlet provided in the main body, a purifying means for purifying dirty air sucked from the air inlet, and a blowing means for ventilating the purifying means. A dirt detecting means for detecting dirt components in the air, a person detecting means for detecting human activity, and a control unit for controlling the air volume of the blowing means by a detection signal from the dirt detecting means and the person detecting means. And the control unit reduces the air volume of the air blowing means determined from the signal from the dirt detecting means, and reduces the air volume of the air blowing means when the detection signal from the person detecting means detects no person. It is a thing.

  By this means, an air purifier can be obtained which can be operated silently to remove dirt even when air dirt occurs at night such as sleeping.

  Further, in order to achieve the above object, the air cleaner of the present invention operates the air blowing means determined by the stored dirt level value for 24 hours when the signal from the brightness detecting means is LOW detection. The air volume is reduced and the operation time is extended.

  By this means, it is possible to obtain an air cleaner that can be operated with energy saving and low noise by changing the operation method in a time zone in which no air pollution occurs.

  In order to achieve the above object, the air purifier of the present invention stores the detection signal from the brightness detection means as time series data, and the time when the brightness level value becomes LOW continuously for a predetermined number of days or more. For the belt, the stop time of intermittent operation is extended from the next day.

  By this means, it is possible to obtain an air cleaner that can be operated with energy saving and low noise by changing the operation method in a time zone in which no air pollution occurs.

  In order to achieve the above object, the air purifier of the present invention stores the detection signal from the brightness detection means as time series data, and the time when the brightness level value becomes LOW continuously for a predetermined number of days or more. With respect to the belt, the air volume of the blowing means that operates intermittently from the next day is lowered.

  By this means, it is possible to obtain an air cleaner that can be operated with energy saving and low noise by changing the operation method in a time zone in which no air pollution occurs.

  In order to achieve the above object, the air purifier of the present invention stores the detection signal from the brightness detection means as time series data, and the time when the brightness level value becomes LOW continuously for a predetermined number of days or more. For the belt, the intermittent operation from the next day is an automatic operation in which the detection operation by the dirt detection means is performed.

  By this means, it is possible to obtain an air cleaner that can be operated with energy saving and low noise by changing the operation method in a time zone in which no air pollution occurs.

  In order to achieve the above object, the air purifier of the present invention is configured to perform intermittent operation when the detection signal from the brightness detection means detects a change from LOW to HIGH. .

  By this means, an air cleaner capable of collecting dirt by operating with a large air volume when returning home can be obtained.

  ADVANTAGE OF THE INVENTION According to this invention, the air cleaner which has the effect of being able to remove a dirt quietly even if dirt generate | occur | produces can be provided by detecting the low noise environment like sleeping at night by a brightness detection means.

  Further, the signal from the dirt detecting means is converted and stored as a dirt level value for 24 hours in time series, and the air volume determined from this dirt level value is processed by the detection signal from the brightness detecting means to blow the air. Since the air volume of the air is controlled in time series, it is possible to provide an air purifier that has an effect of being able to operate suitable for a living scene.

  In addition, by having an operation switch that can reduce the air volume of the air blowing means determined from the detection signal from the dirt detecting means, it is possible to provide an air cleaner that is effective in suppressing noise.

  In addition, since human activity can be detected by the human detection means, an air purifier is provided that is effective in suppressing excess driving by reducing the operating air volume when there is no human activity. it can.

  In addition, when the signal from the brightness detection means is LOW, the air has an effect that the dirt can be removed quietly and surely by further reducing the operation air volume of the air blowing means and extending the operation time. A purifier can be provided.

  In addition, the detection signal from the brightness detection means is stored as data for 24 hours in time series, and the intermittent operation stop time is set from the next day to the time zone in which the brightness level value is LOW continuously for a predetermined number of days or more. By extending the length of the air cleaner, it is possible to provide an air purifier that is effective in energy saving and low noise operation.

  Further, the detection signal from the brightness detection means is stored as data for 24 hours in time series, and the intermittent operation of the blowing means from the next day is performed for the time period in which the brightness level value is LOW continuously for a predetermined number of days or more. By reducing the air volume, it is possible to provide an air cleaner having an effect of further reducing noise.

  Further, the detection signal from the brightness detection means is stored as data for 24 hours in time series, and the intermittent operation is detected from the next day for the time zone in which the brightness level value is LOW continuously for a predetermined number of days or more. By adopting the automatic operation that performs the detection operation based on the air cleaner, it is possible to provide an air cleaner that is effective in that it can be operated in accordance with the actual life scene that is operated only when dirt is generated.

  In addition, when the detection signal from the brightness detection means becomes LOW, by reducing the sensitivity of the dirt detection means, the dirt level value to be detected for the same dirt is lowered, and the air volume by the blower means is also lowered. Therefore, it is possible to provide an air purifier having an effect of being able to operate with low noise.

  In addition, when intermittent detection is started when the detection signal from the brightness detection means detects a change from LOW to HIGH, before the dust is polluted in the room by driving all at once when returning home, Therefore, it is possible to provide an air cleaner having an effect that dust can be collected.

  According to the first aspect of the present invention, there is provided an air inlet provided in the main body, a purifying means for purifying dirty air sucked from the air inlet, an air blowing means for ventilating the purifying means, and a dirt component in the air. A dirt detecting means for detecting the brightness, a brightness detecting means for detecting the brightness of the room, and a control unit for controlling the air volume of the blowing means by a detection signal from the dirt detecting means and the brightness detecting means, The control unit reduces the air volume of the air blowing means determined from the signal from the dirt detecting means, and the air volume of the air blowing means when the detection signal from the brightness detecting means detects LOW. In addition, the level of dirt is low at bedtime at night, and even if dirt is detected, it has the action of being able to remove dirt without disturbing bedtime by driving with a low air volume.

  In addition, an air inlet provided in the main body, a purifying means for purifying dirty air sucked from the air inlet, an air blowing means for ventilating the purifying means, a dirt detecting means for detecting dirt components in the air, Brightness detecting means for detecting the brightness of the air, and a control unit for controlling the air volume of the blower means based on detection signals from the dirt detecting means and the brightness detecting means. The signal is converted into a dirt level value for 24 hours in time series, and the air volume of the blowing means on the next day determined from the stored dirt level value is detected from the brightness detecting means on the current day. The air volume of the air blowing means is controlled in a time-series manner, and even if dirt is detected at bedtime in the middle of the night, it is possible to remove the dirt without disturbing bedtime because it operates with a low air volume. The action To.

  In addition, an air inlet provided in the main body, a purifying means for cleaning dirty air sucked from the air inlet, a blowing means for ventilating the purifying means, a dirt detecting means for detecting dirt components in the air, An operation switch that has a control unit that controls the air volume of the air blowing means based on a detection signal from the dirt detection means, and that the control unit can reduce the air volume of the air blowing means determined from the detection signal from the dirt detection means. By operating the operation switch before going to bed, even if dirt is detected during bedtime, it operates with a low air flow, so that it can remove dirt without hindering bedtime.

  In addition, an air inlet provided in the main body, a purifying means for purifying dirty air sucked from the air inlet, a blower means for ventilating the purifying means, a dirt detecting means for detecting dirt components in the air, A person detecting means for detecting the activity of the air, and a control unit for controlling the air volume of the blowing means by a detection signal from the dirt detecting means and the person detecting means, and the control part is based on a signal from the dirt detecting means. When the detection signal from the human detection means detects that the air flow of the air blowing means is determined to be unattended, the air flow of the air blowing means is lowered, and when there is no person or a person is active If there is no dirt, it is judged that the situation is quiet, and even if dirt is detected, the operation is performed with a low air volume, so that the dirt can be removed with low noise.

  Further, when the signal from the brightness detecting means is LOW detection, the operating air volume of the air blowing means determined by the stored dirt level value for 24 hours is further reduced, and the operating time is extended. Even when no detection has been detected, since it is predicted to operate, it is possible to maintain a clean environment with low noise by operating for a long time at the minimum air volume.

  In addition, the detection signal from the brightness detection means is stored as data for 24 hours in time series, and the intermittent operation stop time is set from the next day to the time zone in which the brightness level value is LOW continuously for a predetermined number of days or more. It is designed to be extended, and has the effect of reducing the number of intermittent operations during that time period, saving energy, and suppressing noise generation.

  In addition, the detection signal from the brightness detecting means is stored as data for 24 hours in time series, and the air blowing means that intermittently operates from the next day for a time period in which the brightness level value is LOW continuously for a predetermined number of days or more. The air volume is lowered, and the operation air volume during intermittent operation in that time period is lowered to save energy and suppress the generation of noise.

  Further, the detection signal from the brightness detecting means is stored as data for 24 hours in time series, and the intermittent operation is detected from the next day for the time zone in which the brightness level value is LOW continuously for a predetermined number of days or more. This is an automatic operation in which the detection operation is performed, and has the effect of being operated only when dirt is generated.

  In addition, when the detection signal from the brightness detection means becomes LOW, the sensitivity of the dirt detection means is lowered. Has the effect of suppressing.

  In addition, intermittent operation is performed when the detection signal from the brightness detection means detects a change from LOW to HIGH, and the brightness detection signal is displayed when the lighting is turned on at home or the like. Since switching from LOW to HIGH, the operation is automatically started to remove pollen and the like adhering to clothes before being scattered in the room.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
As shown in FIGS. 1 to 3, the air purifier main body 1 is formed in a substantially box shape, a front panel (not shown) is provided on the front surface of the main body 1, and an air inlet 2 is formed on the side surface of the main body 1. ing. In the main body 1, a filter 3 for purifying air and a fan motor 4 that passes through the filter 3 are provided, and a blower outlet 10 is provided on the side surface of the main body 1. When the fan motor 4 is driven, air is sucked from the air inlets 2 a and 2 b, cleaned through the filter 3, and then blown out from the air outlet 10.

  A gas detection unit 5 having a gas sensor 5a is provided on the upper left side of the main body 1, and a dust detection unit 6 having an optical dust sensor 6a is provided on the side of the main body 1.

  An operation unit 9 is provided at the upper front of the main body 1, a light detection unit 8 including a control unit 7 and an optical sensor 8 a is housed inside the operation unit 9, and a calculation unit 12 is provided in the control unit 7. . The main body 1 is provided with a dirt display unit 11 at the front left end of the main body 1 to indicate the dirty state of room air by color change.

  In the above configuration, when the power source is energized, the control unit 7 converts the output signal detected by the gas detection unit 5 or the dust detection unit 6 into a dirt level value of 0 to 5. Further, the light detection unit 8 converts it to LOW when detecting that the room is dark, and converts it to HIGH level when detecting that the room is bright.

  Next, when the light detection unit 8 detects the HIGH level, if the air detection is detected by the gas detection unit 5 or the dust detection unit 6, the contamination display unit 11 changes from blue to red and the air volume corresponding to the contamination level. To start driving. At this time, the amount of air blown by the fan motor 4 with respect to the dirt level detected by the gas detector 5 or the dust detector 6 has the relationship shown in FIG.

  On the other hand, when the light detection unit 8 detects the LOW level, the air flow rate of the fan motor 4 with respect to the dirt level detected by the gas detection unit 5 or the dust detection unit 6 is changed as shown in FIG. Yes.

  As described above, the signal detected by the light detection unit 8 can be operated with low noise when sleeping at night or the like by lowering the driving air volume in the dark.

In the first embodiment, the light detection unit is used to detect day and night, and the driving air volume is reduced by assuming human activity. However, the operating air flow may be forcibly reduced by providing an operation switch. Even if a human detection unit is provided to detect a person's activity and reduce the driving air volume, there is no difference in the effect.

  Further, although the daytime and nighttime detection is performed using the light detection unit and the specified operation air volume for the dirt level is lowered, the operation air volume may be lowered by lowering the sensitivity of the gas detection unit and the dust detection unit for determining the dirt level.

  In addition, although the setting is made at bedtime in the middle of the night, there is no difference in the effect even when the user wants to watch TV quietly or is in a concentrated work such as studying.

(Embodiment 2)
The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 4, when the power supply is energized, the control unit 7 converts the output signal detected by the gas detection unit 5 or the dust detection unit 6 into a dirt level value of 0 to 5 at intervals of 20 minutes, and each 20 minutes. The maximum value of the dirt level value is stored, and 72 data for a total of 24 hours is stored in time series.

  First, when the operation unit 9 is set to automatic operation in order to start the first operation, the fan motor 4 is operated for 10 minutes as a basic operation, and a cycle of stopping for 50 minutes is repeated. When air contamination is detected by the gas detection unit 5 or the dust detection unit 6, the contamination display unit 10 changes from blue to red and starts operation with an air volume corresponding to the contamination level. At this time, the amount of air blown by the fan motor 4 with respect to the dirt level detected by the gas detector 5 or the dust detector 6 has the relationship shown in FIG.

  When the air dirt is cleaned and the dirt level becomes 0, the fan motor 4 stops, but when it is determined that the 50-minute stop state continues, the control unit 7 operates for 10 minutes and the 50-minute stop cycle. Shift to intermittent operation repeatedly.

  During the operation as described above, the control unit 7 converts the signal detected by the gas detection unit 5 or the dust detection unit 6 into six levels of dirt levels 0 to 5, and this dirt level value is set at intervals of 20 minutes. Store as time series data for the predicted operation of the next day. In addition, although the individual dirt level value at this time stores the maximum value for each 20 minutes, it may be an average value for each 20 minutes.

  On the next day (24 hours after the start of storage of the dirt data value), the air volume corresponding to the stored dirt level value is turned on for 10 minutes with the air volume determined by the detection signal from the light detection unit 8, Perform basic intermittent operation for 10 minutes OFF. For example, as shown in FIGS. 4A and 4B, the contamination level value detected every 20 minutes from 22:00 to 23:00 is 5, 2, and 1, and the basic intermittent operation on the next day has a strong driving air flow. (10 minutes), 0, medium (10 minutes), 0, weak (10 minutes), 0 intermittent operation at 10-minute intervals, but as shown in FIG. When the room is dark like time, the driving air volume is set to intermittent operation for 10 minutes: medium (10 minutes), 0, weak (10 minutes), 0, weak (10 minutes), 0. When performing the basic intermittent operation, the air detection in the room is detected by the gas detection unit 5 and the dust detection unit 6, and the air volume according to the detected contamination level value is added to the air volume 0 section of the basic intermittent operation. Perform actual operation.

  In this way, it is an unexpected situation by storing the previous day's dirt level in chronological order and setting basic intermittent operation, and determining the actual driving air volume considering the indoor brightness level of the next day However, it is possible to drive with low noise without performing useless driving.

(Embodiment 3)
The same parts as those in the first or second embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. As shown in FIG. 5, the control unit 7 reduces the air volume and extends the operation time during the time period in which the light detection unit 8 detects LOW with respect to the air volume corresponding to the stored dirt level value every 20 minutes. It is.

  In the above configuration, for example, as shown in FIGS. 5A and 5B, the contamination level value detected every 20 minutes from 22:00 to 23:00 is 5, 2, 1, and the basic intermittent operation of the next day is The operation air flow is strong (10 minutes), 0, medium (10 minutes), 0, weak (10 minutes), and intermittent operation at 10-minute intervals, but as shown in FIG. If the room is dark, such as when not sleeping or at bedtime, the driving air volume should be intermittent (by 20 minutes), weak (15 minutes), 0, weak (10 minutes), or 0. Yes.

  In this way, during sleeping at night, the driver does not drive with a large air volume and operates with ultra-low noise, so that driving suitable for a living scene can be performed.

(Embodiment 4)
The same parts as those in the first, second, or third embodiment are denoted by the same reference numerals and detailed description thereof is omitted. As shown in FIGS. 6 (a) and 6 (b), when neither the gas detection unit 5 nor the dust detection unit 6 detects air contamination even during the time when the light detection unit 8 detects the LOW level such as at night, Is continued by intermittent operation at regular intervals (10 minutes ON, 50 minutes OFF). However, in the time zone in which the light detection unit 8 detects the LOW level for three days or more, the control unit 7 operates the operation time 10 for intermittent operation. Change the operation to extend the stop time from 50 minutes to 110 minutes without changing the minutes.

  In this way, by extending the intermittent operation stop time in a time zone where no air pollution occurs at night, energy-saving operation with reduced useless air blowing operation can be achieved, and noise can be reduced.

  Next, as shown in FIG. 6C, in the time zone in which the light detection unit 8 detects the LOW level for five days or more, the control unit 7 decreases the operation air volume in intermittent operation.

  As described above, when the time period during which the light detection unit is LOW detected continues, the operation air volume in the intermittent operation is decreased, and in this embodiment, the operation noise can be greatly reduced by setting the minimum air volume.

  In addition, as shown in FIG. 6D, in the time zone in which the light detection unit 8 detects the LOW level for 7 days or more, the control unit 7 shifts the intermittent operation to the dirt detection operation by the gas detection unit 5 and the dust detection unit 6. Then, switch to automatic operation that operates only when dirt is detected.

  In this way, when the time period in which the light detection unit is LOW detected continues for a long period of time, by switching from intermittent operation to automatic operation that operates by dirt detection, in addition to super energy saving and silence, air blows during sleep It can be set as the driving | running according to the life scene which stops driving | operation.

(Embodiment 5)
The same parts as those in the first, second, third, or fourth embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. As shown in FIG. 7, when the detection signal from the light detection unit 8 continuously detects LOW for 2 hours or more and then detects a change to HIGH, the control unit 7 performs the operation at the maximum air volume for 10 minutes. Is.

  In this way, dust such as pollen adhering to clothes can be efficiently removed by starting operation when returning home and turning on indoor lighting.

  Since the light sensor can be used to drive while sleeping, the present invention can also be applied to operation control of an air conditioner or the like that is used while sleeping other than an air purifier.

1 is a perspective view of a partially broken external view of an air cleaner according to a first embodiment of the present invention. Correlation diagram of operating air volume against dirt level value of each detector Same control block diagram Timing chart of Embodiment 2 of the present invention Timing chart of Embodiment 3 of the present invention Timing chart of Embodiment 4 of the present invention Timing chart of Embodiment 5 of the present invention External perspective view of a partial break of a conventional air cleaner Timing chart of intermittent operation of the air cleaner

Explanation of symbols

1 Body 2 Air intake 3 Filter (purification means)
4 Fan motor
5 Gas detector (dirt detection means)
6 Dust detector (dirt detection means)
7 Control part 8 Light detection part (brightness detection means)

Claims (10)

An air inlet provided in the main body, a purifying means for purifying dirty air sucked from the air inlet, an air blowing means for ventilating the purifying means, a dirt detecting means for detecting dirt components in the air, and a room brightness Brightness detecting means for detecting the brightness, and a control unit for controlling the air volume of the blower means based on detection signals from the dirt detecting means and the brightness detecting means, wherein the control part is a signal from the dirt detecting means. An air cleaner configured to reduce the air volume of the air blowing means determined when the detection signal from the brightness detecting means detects LOW. An air inlet provided in the main body, a purifying means for purifying dirty air sucked from the air inlet, an air blowing means for ventilating the purifying means, a dirt detecting means for detecting dirt components in the air, and a room brightness Brightness detecting means for detecting the brightness, and a control unit for controlling the air volume of the blower means based on detection signals from the dirt detecting means and the brightness detecting means, wherein the control part is a signal from the dirt detecting means. Is stored as a dirt level value for 24 hours in time series, and the air volume of the blowing means on the next day determined from the stored dirt level value is lowered by a detection signal from the brightness detecting means on the current day. An air purifier that controls the air volume of the blowing means in time series. An air inlet provided in the main body, a purifying means for purifying dirty air sucked from the air inlet, a blowing means for ventilating the purifying means, a dirt detecting means for detecting dirt components in the air, and the dirt detection A control unit that controls the air volume of the blower unit according to a detection signal from the unit, and the control unit includes an operation switch that can lower the air volume of the blower unit determined from the detection signal from the dirt detection unit. An air purifier characterized by that. An air inlet provided in the main body, a purifying means for purifying dirty air sucked from the air inlet, a blowing means for ventilating the purifying means, a dirt detecting means for detecting dirt components in the air, and human activities And a control unit for controlling the air volume of the blowing means based on detection signals from the dirt detection means and the person detection means, and the control part is determined from a signal from the dirt detection means. An air cleaner configured to reduce the air volume of the air blowing means when the detection signal from the person detecting means detects that there is no person. The controller further reduces the operating air volume of the air blowing means determined by the stored dirt level value for 24 hours and extends the operating time when the signal from the brightness detecting means is LOW detection. 2. The air cleaner according to 2. The control unit stores the detection signal from the brightness detection means as data for 24 hours in a time series, and the intermittent operation stop time from the next day with respect to a time zone in which the brightness level value is LOW continuously for a predetermined number of days or more. The air purifier according to claim 2, wherein the air cleaner is extended. The control unit stores the detection signal from the brightness detection unit as data for 24 hours in time series, and the blower unit performs intermittent operation from the next day in a time zone in which the brightness level value is LOW continuously for a predetermined number of days or more. The air cleaner according to claim 2, wherein the air volume of the air is reduced. The control unit stores the detection signal from the brightness detection means as data for 24 hours in a time series, and the intermittent operation is smeared from the next day for a time zone in which the brightness level value is LOW continuously for a predetermined number of consecutive days. The air cleaner according to claim 2, wherein an automatic operation in which a detection operation by the detection means is performed. The air cleaner according to claim 1 or 2, wherein the control unit lowers the sensitivity of the dirt detection means when the detection signal from the brightness detection means becomes LOW. The air cleaner according to claim 1 or 2, wherein the controller performs intermittent operation when a detection signal from the brightness detection means detects a change from LOW to HIGH.

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