WO2022269868A1

WO2022269868A1 - Air purifier

Info

Publication number: WO2022269868A1
Application number: PCT/JP2021/023973
Authority: WO
Inventors: 文彦曽根
Original assignee: 三菱電機株式会社
Priority date: 2021-06-24
Filing date: 2021-06-24
Publication date: 2022-12-29
Also published as: TW202300834A; JPWO2022269868A1

Abstract

An air purifier (10) comprises a cabinet (11), an air blowing unit (12), an air-purifying function unit (13), a CO2 detection unit (14), a pollution degree detection unit (15), and a control unit (16). The cabinet (11) has an inlet port (111) and an outlet port (112). The air blowing unit (12) is disposed in the cabinet (11). Indoor air (A) is sucked into the cabinet (11) from the inlet port (111) of the cabinet (11) and is blown out to a room from the outlet port (112). The air-purifying function unit (13) purifies the air (A) sucked from the inlet port (111) by the air blowing unit (12). The CO2 detection unit (14) detects a CO2 concentration in the room. The pollution degree detection unit (15) detects the pollution degree of the air (A) in the room. The control unit (16) determines the presence or absence of a person in the room by using the CO2 concentration detected by the CO2 detection unit (14) and controls the air quantity of the air blowing unit (12) on the basis of the CO2 concentration and the pollution degree detected by the pollution degree detection unit (15).

Description

Air cleaner

The present disclosure relates to an air purifier that cleans indoor air.

Patent Document 1 discloses an air purifier equipped with a motion sensor that detects the movement of people in the room to be cleaned. In Patent Literature 1, operation air volume control is performed according to the state of human movement obtained from a detection signal from a human sensor and the state of indoor brightness obtained from a detection signal from an illuminance sensor.

WO2018/189926

However, in the conventional technology described above, it is necessary to set the detection range of the human sensor within the range of human activity in order to use the human sensor. For this reason, there are restrictions on the installation position of the air purifier, such as installing the air purifier in a place where detection is not blocked by furniture, etc., or the structure of the air purifier by rotating the pedestal of the human sensor. There is a problem that complication occurs.

The present disclosure has been made in view of the above, and it is possible to operate according to the presence or absence of people in the room without being subject to restrictions on the installation position in the room or complicating the structure. The purpose is to obtain an air purifier that can

In order to solve the above-described problems and achieve the object, the air purifier of the present disclosure includes a housing, an air blowing unit, an air cleaning function unit, a CO ₂ detection unit, a contamination level detection unit, and a control unit. And prepare. The housing has an inlet and an outlet. The air blowing unit is arranged inside the housing, sucks indoor air from the suction port of the housing, and blows the air into the room from the blowing port. The air cleaning function unit cleans the air sucked from the suction port by the air blowing unit. The CO ₂ detector detects the indoor CO ₂ concentration. The pollution level detection unit detects the pollution level of indoor air. The control unit uses the CO ₂ concentration detected by the CO ₂ detection unit to determine whether or not there is a person in the room, and based on the CO ₂ concentration and the contamination level detected by the contamination level detection unit, the air blower unit to control the air volume of the

The air purifier according to the present disclosure has the effect of being able to operate according to the presence or absence of people in the room without being subject to restrictions on the installation position in the room or complicating the structure.

BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing which shows typically an example of a structure of the air cleaner which concerns on Embodiment 1 FIG. 2 is a block diagram showing an example of a hardware configuration of a controller provided in the air purifier according to Embodiment 1; Flowchart showing an example of a control processing procedure of the control unit of the air purifier according to Embodiment 1 FIG. 4 is a diagram schematically showing an example of the configuration of an air cleaning system provided with an air cleaner according to Embodiment 2; Flowchart showing an example of the control processing procedure of the control unit of the air purifier according to Embodiment 2 Flowchart showing an example of the control processing procedure of the control unit of the air purifier according to Embodiment 2

Below, the air purifier according to the embodiment of the present disclosure will be described in detail based on the drawings.

Embodiment 1.
FIG. 1 is a cross-sectional view schematically showing an example of the configuration of an air purifier according to Embodiment 1. FIG. In one example, the air cleaner 10 is placed on an indoor floor and used. The air purifier 10 includes a housing 11 having an inlet 111 and an outlet 112, an air blower 12 that draws in air A from the inlet 111 and sends an airflow that is the flow of the air A toward the outlet 112, and an air blower. and an air cleaning function unit 13 arranged on the upstream side of 12 .

A space from the inlet 111 to the outlet 112 inside the housing 11 is called an air passage 113 . One example of the blower section 12 is a multi-blade blower having a motor and a fan that is plugged into the shaft of the motor. The air cleaning function unit 13 cleans the air A by removing dust and the like from the air A sucked from the suction port 111 . An example of the air cleaning function unit 13 is an electric dust collector. The electric dust collector is a device that is arranged in the middle of the air passage 113 and cleans the indoor air A taken in from the suction port 111 by collecting electric dust. The electrostatic precipitator includes a metal positive electrode to which a high voltage of about 10 kV is applied, and a metal ground electrode having a potential equivalent to the ground potential. An electric dust collector forms a discharge space between a positive electrode and a ground electrode, and charges dust passing through the discharge space. In the electric dust collector, a conductive dust collection filter having a potential equivalent to the ground potential is arranged in the air passage 113 behind the discharge space, and the charged dust is attracted to the ground electrode and the dust collection filter by Coulomb force. to collect dust.

The air blowing unit 12 is arranged inside the housing 11, sucks the indoor air A from the suction port 111 of the housing 11, and blows it indoors from the blowing port 112. The air blower 12 can switch between an operating state and a stopped state, and can change the air volume in a plurality of stages in the operating state. In the following description, the operating state of the air blowing unit 12 will be described as being switchable between three states of a small air volume state, a medium air volume state, and a large air volume state. In the operating state, the smaller the air volume, the smaller the noise.

The air A sucked from the suction port 111 passes through the air cleaning function part 13 installed in the air passage 113 and is taken into the blower part 12 . Dust and the like in the air A are thereby removed. The air A sent out from the air blower 12 is blown out into the room from the outlet 112 via the air passage 113 .

The air purifier 10 includes a CO ₂ detection unit 14 that detects the indoor CO ₂ concentration, a contamination level detection unit 15 that detects the contamination level of the indoor air A, and the detection result of the CO ₂ detection unit 14 and the contamination level detection. and a control unit 16 that controls the amount of air blown by the blower unit 12 based on the detection result of the unit 15 . An example of the CO ₂ detector 14 is a CO ₂ sensor. Specifically, the contamination level detection unit 15 is a dust sensor that detects the concentration of dust, an odor sensor that detects the concentration of odorous substances, and the like. Odorants are substances emitted from the human body, examples being ammonia, hydrogen sulfide or methyl mercaptan. In this specification, the degree of pollution indicates the concentration of pollutants in the air A, such as dust and odorants, and the higher the degree of pollution, the more polluted the air A is. Although not shown, the blower unit 12, the CO ₂ detection unit 14, the contamination level detection unit 15, and the control unit 16 are electrically connected by wiring.

The control unit 16 determines whether or not there is a person in the room based on the CO ₂ concentration detected by the CO ₂ detection unit 14 . In one example, the CO _{2 concentration when one person is considered to be present in the atmosphere is used as a determination reference value, and when the CO 2} _{concentration} is higher than the determination reference value, it is determined that a person exists. For example, since the normal CO ₂ concentration in the atmosphere is about 400 ppm, by setting the determination reference value to about 600 ppm, it is possible to more accurately determine whether or not a person is present in the room. The criterion value corresponds to the first criterion value.

A human sensor that detects heat is usually used as a sensor for detecting the presence or absence of a person in a room. The detection range of the human sensor must be set within the human activity range. For this reason, the air purifier 10 must be installed in a place where the detection of a person is not blocked by furniture or the like, and an air purifier using a human sensor imposes restrictions on the installation position. Alternatively, in order to detect the range in which people are active, a complex structure such as rotating the pedestal of the human sensor is required, which increases the manufacturing cost of the air purifier. However, when the presence or absence of a person in the room is detected using the CO ₂ detection unit 14 as in Embodiment 1, the nature of the CO ₂ generated by the person diffusing in the room is utilized. Compared to motion sensors, detection is not blocked by the presence of furniture, etc. Therefore, there is no restriction on the installation position of the air purifier 10, and there is no need for a complicated structure for rotating the pedestal of the CO ₂ detection unit 14 for detection. In comparison, the manufacturing cost of the air purifier 10 can be reduced with a simple structure. _CO2 is also generated when cooking or heating equipment that burns fuel such as gas or kerosene is used. This does not cause a misjudgment between "state" and "state in which a person exists".

The control unit 16 controls the air volume of the blower unit 12 according to the detection results of the CO ₂ detection unit 14 and the contamination level detection unit 15 . Specifically, if there are people in the room and the room is not polluted, the control unit 16 performs or stops the operation with a small air volume, and if the room is polluted, the controller 16 performs a medium air volume operation. do the driving. In addition, the control unit 16 performs or stops the operation with a small air volume when there is no person in the room and the room is not polluted, and performs the large air volume operation when the room is polluted. conduct.

The control unit 16 is implemented as a processing circuit. The processing circuitry may be dedicated hardware, an integrated circuit, or a circuit with a processor. 2 is a block diagram showing an example of a hardware configuration of a controller provided in the air purifier according to Embodiment 1. FIG. The control unit 16 has a processor 501 and a memory 502 . The processor 501 is a CPU (Central Processing Unit, central processing unit, processing unit, arithmetic unit, microprocessor, microcomputer, also called DSP (Digital Signal Processor)), system LSI (Large Scale Integration), or the like. The memory 502 is a non-volatile or A volatile semiconductor memory, a magnetic disk, a flexible disk, an optical disk, a compact disk, a mini disk, a DVD (Digital Versatile Disc), or the like. Processor 501 and memory 502 are connected via bus line 503 .

The control unit 16 reads from the memory 502 a program describing the procedure for controlling the air volume of the blower unit 12 based on the detection results of the CO ₂ detection unit 14 and the contamination level detection unit 15, and the processor 501 executes the program. Realized. Also, multiple processors and multiple memories may work together to achieve the above functions. Also, part of the functions of the control unit 16 may be implemented as an electronic circuit that is dedicated hardware, and other parts may be implemented using the processor 501 and the memory 502 . In one example, the control unit 16 controls the operation of the blower unit 12 using electrical signals.

Next, the operation of the air cleaner 10 having such a configuration will be described. 3 is a flowchart illustrating an example of a control processing procedure of a control unit of the air purifier according to Embodiment 1. FIG. First, when the power of the air cleaner 10 placed indoors is turned on, the operation of the air cleaner 10 is started. The control unit 16 acquires the CO ₂ concentration from the CO ₂ detection unit 14 (step S11), and determines whether the acquired CO ₂ concentration is equal to or higher than the determination reference value for determining that a person is present in the room ( step S12).

If the CO ₂ concentration is smaller than the determination reference value (No in step S12), the control unit 16 determines that there is no person in the room (step S13). After that, the control unit 16 acquires the detection result of the pollution degree from the pollution degree detection unit 15 (step S14), and determines whether the indoor air A is contaminated (step S15). As described above, one example of the degree of contamination detected by the degree of contamination detection unit 15 is the concentration of dust or the concentration of odor. Here, the controller 16 determines whether the degree of contamination is equal to or higher than the contamination determination reference value at which it can be determined that the room is contaminated with contaminants. The contamination determination reference value may be a different value or the same value depending on whether the object to be detected by the contamination degree detection unit 15 is dust or an odorant. The contamination criterion value corresponds to the second criterion value.

If the indoor air A is not polluted (No in step S15), that is, if the degree of contamination is less than the contamination judgment reference value, it is better to suppress wasteful power consumption. , the air blowing unit 12 is controlled to operate at a small air volume or to be stopped (step S16). Whether to operate with a small air volume or stop may be determined according to the value of the detection result. After that, the process returns to step S11.

If the air A in the room is polluted (Yes in step S15), that is, if the degree of contamination is equal to or higher than the contamination criterion value, the air A is removed in a short period of time before a person is present. Since it is better to clean, the controller 16 controls the air blower 12 to operate with a large air volume (step S17). After that, the process returns to step S11.

If the CO ₂ concentration is equal to or higher than the determination reference value in step S12 (Yes in step S12), the control unit 16 determines that there are people in the room (step S18). After that, the control unit 16 acquires the detection result of the pollution degree from the pollution degree detection unit 15 (step S19), and determines whether the indoor air A is contaminated (step S20). Also here, similarly to step S15, the control unit 16 determines whether the degree of contamination is equal to or higher than the contamination determination reference value.

If the indoor air A is not contaminated (No in step S20), that is, if the degree of contamination is less than the pollution criterion value, the air purifier 10 is operated as quietly as possible and Since it is better to suppress the power consumption, the control unit 16 controls the blower unit 12 to operate at a small air volume or to stop (step S21). Whether to operate with a small air volume or stop may be determined according to the value of the detection result. After that, the process returns to step S11.

If the indoor air A is polluted (Yes in step S20), that is, if the degree of contamination is equal to or higher than the contamination criterion value, the noise caused by the operation of the air purifier 10 hinders the work of people in the room. Since it is better to purify the air A to the extent that it is not cleaned, the control unit 16 causes the blower unit 12 to operate at a medium air volume (step S22). That is, the controller 16 increases the air volume of the air blower 12 . After that, the process returns to step S11.

When the state of air quality in the room changes from "air A is dirty" to "air A is not dirty" or vice versa while the above control processing is being repeatedly executed, Decrease or increase of the air volume in the air blower 12 is performed according to the flow chart of FIG.

In step S12, when the CO ₂ concentration is the determination reference value, the control unit 16 determines that there is a person in the room. It may be determined that there is In step S15, the control unit 16 controls the air blower 12 to operate with a large air volume when the degree of contamination is the contamination determination reference value. It may be controlled as follows. Furthermore, in step S20, when the degree of contamination is the contamination judgment reference value, the control unit 16 controls the blower unit 12 to operate at a medium air volume. It may be controlled as follows.

The air cleaner 10 of Embodiment 1 includes a CO ₂ detector 14 , a pollution level detector 15 and a controller 16 . The control unit 16 uses the CO ₂ concentration detected by the CO ₂ detection unit 14 to determine whether a person exists in the room where the air cleaner 10 is installed. Then, the control unit 16 controls the air volume of the air blowing unit 12 based on the presence or absence of the presence of a person in the room and the detection result of the pollution degree by the pollution degree detection unit 15 . When a human sensor is used to detect people in a room, a complicated structure such as rotating the pedestal of the human sensor is required. Cost will be higher. However, in Embodiment 1, the CO ₂ detection unit 14 only detects the CO ₂ concentration in the air A, and does not require a structure for rotating the pedestal. The structure can be simplified. As a result, the air purifier 10 can be operated at a lower cost than when a human sensor is used, and the air purifier 10 can be operated according to the presence or absence of a person in the room. In addition, in the case of an air purifier using a human sensor, the detection range of the human sensor must be set within the range where people are active, and it must be placed in a position where the detection is not blocked by furniture, etc. Installation position is limited. However, in the air purifier 10 of Embodiment 1, the presence or absence of a person in the room is determined using the CO ₂ concentration in the air A, so the installation position is limited like an air purifier using a human sensor. There is no That is, the air purifier 10 of Embodiment 1 can be arranged at any position in the room.

The CO ₂ concentration is also increased by using cooking or heating appliances that generate CO ₂ by burning fuel such as gas or kerosene in the room where the air purifier 10 is placed. However, cooking or heating appliances are appliances that are used when people are present. For this reason, in the form of determining the presence or absence of a person using the CO ₂ concentration, even if the above cooking utensils or heating appliances are present, it is possible to erroneously determine the state of the absence of people and the state of the presence of people. cannot be the cause.

Embodiment 2.
_CO2 concentration is known to affect productivity performance or health status. For this reason, regulation values are provided for the CO ₂ concentration. For example, the Building Management Law in Japan stipulates that the CO ₂ concentration in a building should be 1000 ppm or less. At present, there is no filter that can remove CO ₂ that can be mounted on the air purifier 10 . For this reason, in order to reduce the indoor CO ₂ concentration, it is common to use a ventilator that exchanges the outside air A with the indoor air A. Therefore, in Embodiment 2, an air purifier 10 capable of reducing the indoor CO ₂ concentration in cooperation with a ventilation device will be described.

FIG. 4 is a diagram schematically showing an example of the configuration of an air cleaning system provided with an air cleaner according to Embodiment 2. FIG. In addition, the same code|symbol is attached|subjected to the component same as Embodiment 1, and the description is abbreviate|omitted. The air cleaning system includes an air cleaner 10 and a ventilator 30. - 特許庁

The air purifier 10 further includes a signal transmitter 17 in addition to the configuration described in the first embodiment. The signal transmission unit 17 is electrically connected to the control unit 16 and transmits signals to the ventilator 30 by wireless communication. In one example, the signal transmitter 17 transmits a signal using infrared rays.

The control unit 16 adjusts the indoor 51 to a predetermined CO ₂ concentration and contamination degree according to the CO ₂ concentration detected by the CO ₂ detection unit 14 and the contamination degree detected by the contamination degree detection unit 15. The operation of the air purifier 10 and the ventilator 30 is controlled so that When controlling the operation of the ventilator 30 , the control unit 16 generates an operation signal that instructs the operation of the ventilator 30 and transmits the signal to the ventilator 30 via the signal transmission unit 17 .

The ventilation device 30 is a device that can supply the air A outside the building 50 , that is, the outside air into the room 51 and exhaust the air A in the room 51 to the outside of the building 50 . In one example, the ventilation device 30 is a type 1 ventilation type ventilation device that mechanically supplies and exhausts air, a type 2 ventilation type ventilation device that mechanically supplies air and exhausts air from an exhaust port, and Any of the third-class ventilation type ventilators, in which air is supplied from an air supply port and exhausted mechanically, may be used. In the case of a type 1 ventilation type ventilator, the heat exchanger 34 may be provided inside the ventilator 30 .

In FIG. 4 , a type 1 ventilation type ventilation system including a heat exchanger 34 is illustrated as the ventilation system 30 . The ventilation device 30 includes a housing 31 , a supply air blower 32 , an exhaust air blower 33 , a heat exchanger 34 , an outside air cleaning filter 35 , a signal receiver 36 and a controller 37 .

The housing 31 has an outside air inlet 311 , a supply air outlet 312 , an indoor air inlet 313 , and an exhaust outlet 314 . Inside the housing 31, a supply air passage connecting the outside air intake port 311 and the supply air discharge port 312 and an exhaust air passage connecting the indoor air suction port 313 and the exhaust discharge port 314 are formed. The supply air path and the exhaust air path are separated. The supply air blower 32 is provided in the supply air path, and the exhaust air blower 33 is provided in the exhaust air path. The heat exchanger 34 is arranged at a position where the exhaust air passage and the supply air passage intersect. The outside air cleaning filter 35 is provided at the outside air suction port 311 and removes dust, pollen, etc. contained in the outside air. The signal receiver 36 receives an operation signal from the air purifier 10, for example. The control unit 37 controls operations of the supply air blower 32 and the exhaust air blower 33 according to the operation signal received by the signal reception unit 36 . The control unit 37, the supply air blower 32, the exhaust air blower 33, and the signal reception unit 36 are electrically connected.

If the ventilator 30 is operable by a remote controller, the ventilator 30 is equipped with a remote controller signal receiver that receives signals from the remote controller. Therefore, the remote controller signal receiving section may substitute for the signal receiving section 36 . Note that the remote controller is hereinafter referred to as a remote controller. However, in this case, the signal transmission unit 17 of the air cleaner 10 is controlled so that the remote control code of the signal transmission unit 17 of the air cleaner 10 and the remote control code of the signal reception unit 36 of the ventilation device 30 match. A remote control code is set.

The control by the controller 16 of the air purifier 10 in such an air purifying system will be explained. However, here, as shown in FIG. 4, it is assumed that the ventilator 30 is performing type 1 ventilation.

When the CO ₂ concentration detected by the CO ₂ detection unit 14 is less than the exhaust standard value, which is a predetermined standard value, the control unit 16 of the air cleaner 10 causes the ventilation device 30 to operate at a normal air volume. It generates and transmits an operation signal that instructs normal air volume operation, which is operation. The normal air volume operation is, for example, an operation with an air volume stipulated by law, and is an operation mode in which the air conditioner is always operated. When the detected CO ₂ concentration is greater than the exhaust standard value, the control unit 16 generates and transmits an operation signal instructing the ventilator 30 to operate to increase the air volume. The operation signal at this time includes an instruction to set the air volume according to the difference between the CO ₂ concentration and the exhaust standard value. That is, it is desirable that the larger the difference between the CO ₂ concentration and the exhaust standard value, the larger the air volume. Further, when the CO ₂ concentration in the room 51 falls below the exhaust standard value, the control unit 16 generates and transmits an operation signal instructing the ventilation device 30 to operate at a normal air volume. When the CO ₂ concentration is equal to the exhaust standard value, the control unit 16 may generate and transmit an operation signal instructing the ventilator 30 to operate to increase the air volume, or may perform an operation instructing the normal air volume operation. A signal may be generated and transmitted. The exhaust standard value corresponds to the third standard value.

When the CO ₂ concentration in the room 51 is higher than the exhaust standard value, increasing the air volume of the ventilation device 30 generally reduces the degree of contamination, that is, the concentration of dust or odor. This is because the ventilator 30 discharges dust and odor together with CO ₂ in the room 51 , and the outside air flowing in instead is cleaner than the air A in the room 51 . Therefore, when an operation instruction to increase the air volume of the ventilation device 30 is issued and the degree of pollution in the room 51 detected by the degree of pollution detection unit 15 is low, the control unit 16 controls the air purifier 10 is controlled to reduce the air volume of the air blowing unit 12 . Thereby, the noise and power consumption of the air cleaner 10 can be suppressed.

However, if the outside air is more polluted than the air A in the room 51 depending on the seasonal conditions of the outside air such as pollen, yellow sand, PM (Particulate Matter) 2.5, cooking odors, etc. or the surrounding work conditions. There is At this time, if the air volume of the ventilation device 30 is increased, the dust concentration or the odor concentration increases, and the value indicating the contamination level detected by the contamination level detection unit 15 increases. In such a case, the control unit 16 does not reduce the air volume of the air purifier 10, but maintains the current air volume.

Furthermore, similarly, when the outside air is more polluted than the air A in the room 51 and the ventilator 30 is a type 1 ventilation type ventilator, the control unit 16 suppresses exhaust air and supplies air. An operating signal may be generated and transmitted to instruct switching to the Qi-increasing operating mode. This is because the air supply path of the ventilator 30 often incorporates the outside air cleaning filter 35 . An example of switching from an exhaust mode to an exhaust and air supply mode is an example of switching to an operation mode for suppressing exhaust air and increasing air supply in a type 1 ventilation type ventilator.

5 and 6 are flowcharts showing an example of control processing procedures of the control unit of the air cleaner according to Embodiment 2. FIG. First, when the power of the air cleaner 10 placed in the room 51 is turned on, the operation of the air cleaner 10 is started. Also, it is assumed that the ventilator 30 provided in the room 51 is in a state of at least exhausting operation. The control unit 16 of the air cleaner 10 acquires the CO ₂ concentration from the CO ₂ detection unit 14 (step S31), and determines whether the acquired CO ₂ concentration is equal to or higher than the exhaust standard value (step S32).

When the CO ₂ concentration is smaller than the exhaust standard value (No in step S32), the control unit 16 generates an operation signal instructing normal air volume operation, and transmits the operation signal to the ventilation unit 17 via the signal transmission unit 17. It is transmitted to the device 30 (step S33). After that, similarly to steps S11 to S22 in FIG. 3 of Embodiment 1, the air volume of air cleaner 10 is controlled according to the CO ₂ concentration from CO ₂ detection unit 14 and the pollution level from pollution level detection unit 15. (steps S34 to S45). After that, the process returns to step S31.

If the CO ₂ concentration is equal to or higher than the exhaust standard value (Yes in step S32), the control unit 16 generates an operation signal that instructs the air volume increasing operation to increase the air volume of the ventilation device 30 more than the current air volume. and transmitted to the ventilator 30 via the signal transmitter 17 (step S46). In one example, the control unit 16 generates an operation signal for air volume increasing operation so that the air volume corresponds to the difference between the CO ₂ concentration and the exhaust standard value.

After that, the control unit 16 acquires the contamination level detection result from the contamination level detection unit 15 (step S47), and determines whether the contamination level in the room 51 has decreased (step S48). For determining whether the contamination level in the room 51 is decreasing, for example, it is possible to use a plurality of contamination levels obtained from the contamination level detection unit 15 at predetermined intervals.

When the degree of contamination in the room 51 has decreased (Yes in step S48), the control unit 16 blows air so as to reduce the air volume of the blower unit 12 of the air purifier 10 at that time. The unit 12 is controlled (step S49). Then, the process returns to step S31.

When the degree of contamination in the room 51 is increasing (No in step S48), the control unit 16 controls the blower unit 12 so as to maintain the air volume of the air cleaner 10 at that time (step S50). Further, the control unit 16 generates an operation signal instructing switching to an operation mode for suppressing exhaust gas and increasing air supply, and transmits the operation signal to the ventilator 30 via the signal transmission unit 17 (step S51). Then, the process returns to step S31.

As described above, in Embodiment 2, the control unit 16 of the air cleaner 10 instructs the ventilation device 30 provided in the room 51 to control the air volume in accordance with the detection result of the CO ₂ concentration in the room 51. I let it out. In particular, when the CO ₂ concentration exceeds the exhaust standard value, an operation instruction to increase the exhaust air volume of the ventilator 30 is issued. In this state, if the degree of pollution in the room 51 is decreasing, the air volume of the air purifier 10 is decreased, and if the degree of contamination in the room 51 is increasing, the air purifier 10 is turned on. An operation signal is sent to the ventilator 30 to instruct switching to an operation mode in which exhaust is suppressed and air supply is increased while maintaining the air volume at the point in time. In this way, the control unit 16 can detect the presence or absence of people in the room 51 and the state of activity. By controlling the operating states of the air purifier 10 and the ventilation device 30, the CO ₂ concentration and pollution degree in the room 51, which deteriorate due to human activity, can be improved to fall within a predetermined range. It has the effect of being able to

The configurations shown in the above embodiments are only examples, and can be combined with other known techniques, or can be combined with other embodiments, without departing from the scope of the invention. It is also possible to omit or change part of the configuration.

10 air purifier, 11, 31 housing, 12 air blower, 13 air cleaning function unit, 14 CO ₂ detection unit, 15 pollution degree detection unit, 16, 37 control unit, 17 signal transmission unit, 30 ventilator, 32 supply Air blower 33 Exhaust air blower 34 Heat exchanger 35 Outside air cleaning filter 36 Signal receiving unit 50 Building 51 Room 111 Inlet 112 Outlet 113 Wind path 311 Outside air intake 312 Supply air Outlet, 313 Indoor Air Inlet, 314 Exhaust Outlet, A Air.

Claims

a housing having an inlet and an outlet;
an air blower disposed inside the housing, sucking indoor air from the suction port of the housing and blowing air into the room from the air outlet;
an air cleaning function unit that cleans the air sucked from the suction port by the air blowing unit;
a CO 2 detection unit that detects the CO 2 concentration in the room;
a pollution degree detection unit that detects the degree of pollution of the air in the room;
Using the CO 2 concentration detected by the CO 2 detection unit, the presence or absence of a person in the room is determined, and the air is blown based on the CO 2 concentration and the pollution level detected by the pollution level detection unit. a control unit that controls the air volume of the unit;
An air purifier comprising:
The control unit determines that the air in the room is polluted when the CO 2 concentration is smaller than a first reference value that is determined to be a state in which a person exists in the room. 2. The air purifier according to claim 1, wherein when the degree of pollution is higher than the second reference value, the air volume of the air blower is increased.
The control unit determines that the air in the room is polluted when the CO 2 concentration is smaller than a first reference value that is determined to be a state in which a person exists in the room. 2. The air purifier according to claim 1, wherein when the degree of pollution is smaller than the second reference value, the air volume of the air blower is reduced or stopped.
The control unit determines that the air in the room is polluted when the CO 2 concentration is greater than a first reference value that is determined to be a state in which a person exists in the room. 2. The air purifier according to claim 1, wherein when the degree of pollution is smaller than the second reference value, the air volume of the air blower is reduced or stopped.
The air blower can change the air volume in a plurality of stages,
The control unit determines that the air in the room is polluted when the CO 2 concentration is greater than a first reference value that is determined to be a state in which a person exists in the room. 2. The air purifier according to claim 1, wherein when the degree of pollution is higher than the second reference value, the air volume of the air blower is set to a medium air volume among a plurality of stages.
further comprising a signal transmission unit that transmits a signal to a ventilation device provided in the room;
6. The control unit according to any one of claims 1 to 5, wherein the signal transmission unit transmits an operation signal for controlling the air volume of the ventilation device based on the CO 2 concentration detected by the CO 2 detection unit. or 1 air purifier.
The control unit is characterized in that, when the CO 2 concentration in the room is higher than a predetermined third reference value, the signal transmission unit transmits an operation signal for increasing the air volume of the ventilation device. The air cleaner according to claim 6.
The air purifier according to claim 7, wherein the control unit reduces the air volume of the blower unit after transmitting the operation signal for increasing the air volume of the ventilation device.
8. The control unit maintains the air volume of the blower unit when the degree of pollution increases after the transmission of the operation signal for increasing the air volume of the ventilation device. Air purifier as described.
After transmitting the operation signal for increasing the air volume of the ventilator, the control unit suppresses the exhaust of the ventilator and increases the supply of air when the pollution level is increasing. 10. The air purifier according to claim 9, wherein the transmission is performed through the transmitter.