JP7599381B2 - Ventilation system - Google Patents

Description

This disclosure relates to a ventilation device equipped with a detection unit that detects the amount of contamination in the air.

In recent years, as the airtightness of buildings has improved, interest in improving the indoor environment has increased, and attention has been paid to reducing indoor air pollutants such as dust, pollen, fine particulate matter, carbon dioxide (CO ₂ ), cigarette smoke, etc. In order to reduce indoor air pollutants, it is common to ventilate the room using a ventilation device equipped with a blower to exhaust indoor air to the outside. Fine particulate matter is also called PM (Particulate Matter) 2.5.

Even within a single space such as a room, there are areas with high levels of contamination and areas with low levels of contamination, depending on the positions of people and objects, or the density of people and objects. Therefore, in order to efficiently reduce indoor air contamination, it is necessary to ventilate the space based on the results of detecting the levels of air contamination at multiple points within the space, rather than detecting the level of air contamination at one point within the space and ventilating the space based on that result.

Patent Document 1 discloses a ventilation system in which multiple ventilation devices equipped with carbon dioxide sensors are installed in one target space. In the ventilation system disclosed in Patent Document 1, the control device controls the number of operating ventilation devices so that the detection value of the carbon dioxide sensor for all operating ventilation devices is below a reference value. The control device then increases the number of operating ventilation devices as the threshold value set as the reference value from among multiple threshold values becomes larger, and decreases the number of operating ventilation devices as the set threshold value becomes smaller.

JP 2018-119752 A

However, the technology disclosed in Patent Document 1 requires multiple ventilation devices equipped with sensors to detect the amount of air pollution, and a control device for controlling the number of ventilation devices in operation must also be installed separately from the ventilation devices. In other words, the technology disclosed in Patent Document 1 requires the installation of multiple ventilation devices and the individual control of each device in order to efficiently reduce indoor air pollution.

This disclosure has been made in consideration of the above, and aims to provide a ventilation device that can efficiently reduce indoor air pollution with a single unit.

In order to solve the above-mentioned problems and achieve the object, the ventilation device according to the present disclosure includes a housing having a plurality of intake ports and an exhaust port provided individually corresponding to a plurality of different ventilation target areas in a room, and a blower disposed within the housing and generating a flow of indoor air from the intake port to the exhaust port. The ventilation device includes a plurality of intake port opening/closing units that open and close each of the plurality of intake ports, a plurality of dirt amount detection units provided in each of the plurality of intake ports that detect the amount of dirt in the indoor air passing through each of the plurality of intake ports, and a control unit that controls the opening/closing operation of the intake port opening/closing units and the air volume of the blower based on the amount of dirt in the indoor air in each of the plurality of ventilation target areas.

The present disclosure has the effect of providing a ventilation device that can efficiently reduce indoor air pollution with a single unit.

FIG. 1 is a schematic diagram showing a configuration of a ventilation device according to a first embodiment; Functional block diagram of a ventilation device according to the first embodiment A flowchart showing a procedure of ventilation operation in the ventilation device according to the first embodiment. FIG. 1 is a condition setting table showing operation control conditions in the ventilation device according to the first embodiment. FIG. 13 is a schematic diagram showing a configuration of a ventilation device according to a second embodiment. FIG. 13 is a schematic diagram showing a configuration of a ventilation device according to a third embodiment. FIG. 13 is a diagram showing an example of a hardware configuration of a control unit of a ventilation device according to the first to third embodiments.

The ventilation device according to the embodiment is described in detail below with reference to the drawings.

Embodiment 1.
FIG. 1 is a schematic diagram showing the configuration of a ventilation device according to embodiment 1. FIG. 1 shows a structure seen when one surface of the ventilation device 100 is seen through. FIG. 2 is a functional block diagram of the ventilation device according to embodiment 1. The ventilation device 100 is installed by being embedded in the attic 220. The space above the ceiling 200 is the attic 220, and the space below the ceiling 200 is the room 210. The room 210 is a ventilation target space and includes a first area 210a which is a first ventilation target area and a second area 210b which is a second ventilation target area. The second ventilation target area is an area different from the first ventilation target area. That is, the room 210 which is a ventilation target space has a plurality of ventilation target areas.

The ventilation device 100 includes a remote controller 20. The remote controller 20 includes an input interface such as a button switch or a touch panel, and accepts input operations of commands for various controls such as the ventilation operation of the ventilation device 100. The remote controller 20 transmits the various commands received by the input interface to the control unit 7, which will be described later. In other words, the remote controller 20 can switch the operation of the ventilation device 100 between on and off, change the ventilation air volume, change the ventilation mode, set the operation timer, and so on. The remote controller 20 is installed inside the room 210.

The ventilation device 100 comprises a housing 1. The housing 1 has an exhaust port 2 on a first surface, a first indoor air intake port 3a on a second surface, and a second indoor air intake port 3b on a third surface. The exhaust port 2 is an exhaust port that exhausts indoor air drawn into the ventilation device 100 to the outside. The first indoor air intake port 3a and the second indoor air intake port 3b are indoor air intake ports 3 through which air from the room 210 is drawn.

The first indoor air intake 3a and the second indoor air intake 3b correspond to the first area 210a and the second area 210b, which are multiple different ventilation target areas in the room 210. Therefore, the ventilation device 100 can individually suck in indoor air from the first area 210a and the second area 210b, which are multiple ventilation target areas in the room 210. When there is no need to distinguish between the first indoor air intake 3a and the second indoor air intake 3b, they are referred to as the indoor air intake 3.

The exhaust port 2 is connected to the outdoors 230 via an outdoor exhaust duct 9 that leads to the outside of the building. The first indoor air intake 3a is connected to the first area 210a via an indoor exhaust duct 10a that leads to the first area 210a. The second indoor air intake 3b is connected to the second area 210b via an indoor exhaust duct 10b that leads to the second area 210b.

The housing 1 has an exhaust air duct 8 that connects the first indoor air intake 3a and the second indoor air intake 3b to the exhaust air outlet 2. The exhaust air duct 8 is an air duct for exhausting the first return air RA1, which is the indoor air of the first area 210a in the room 210, and the second return air RA2, which is the indoor air of the second area 210b in the room 210, to the outdoors 230.

The ventilation device 100 has two suction port opening/closing units 4. One of the two suction port opening/closing units 4 provided in the ventilation device 100 is a first suction port opening/closing unit 4a that opens and closes the first indoor air suction port 3a, and the other is a second suction port opening/closing unit 4b that opens and closes the second indoor air suction port 3b. When there is no need to distinguish between the first suction port opening/closing unit 4a and the second suction port opening/closing unit 4b, they are referred to as suction port opening/closing units 4. Opening/closing parts such as dampers or shutters are used for the first suction port opening/closing unit 4a and the second suction port opening/closing unit 4b. In the first embodiment, a case will be described in which the first suction port opening/closing unit 4a and the second suction port opening/closing unit 4b are configured by dampers.

The ventilation device 100 includes an exhaust fan 5. The fan 5 is a fan that generates an exhaust flow from the inlet end to the outlet end of the exhaust air duct 8, i.e., an exhaust flow from the first indoor air intake port 3a and the second indoor air intake port 3b to the exhaust port 2, and is provided in the exhaust air duct 8. The fan 5 constitutes a blowing section that ventilates the indoor air. The fan 5 includes a motor 5a for driving the fan 5. The rotation speed of the motor 5a changes in response to control by the control unit 7 described later.

When the blower 5 is driven, the first return air RA1, which is indoor air in the first area 210a in the room 210, is sucked in through the first indoor air intake 3a, flows through the exhaust air duct 8, and is exhausted to the outdoors 230 through the exhaust port 2. When the blower 5 is driven, the second return air RA2, which is indoor air in the second area 210b in the room 210, is sucked in through the second indoor air intake 3b, flows through the exhaust air duct 8, and is exhausted to the outdoors 230 through the exhaust port 2.

The ventilation device 100 has two dirt amount detection units 6. One of the two dirt amount detection units 6 is a first dirt amount detection unit 6a, and the other is a second dirt amount detection unit 6b. When there is no need to distinguish between the first dirt amount detection unit 6a and the second dirt amount detection unit 6b, they are referred to as dirt amount detection units 6. The first dirt amount detection unit 6a is provided at the first indoor air intake 3a. The second dirt amount detection unit 6b is provided at the second indoor air intake 3b.

The first dirt amount detection unit 6a and the second dirt amount detection unit 6b detect the amount of dirt in the air in the first area 210a and the second area 210b, and transmit information on the amount of dirt in the indoor air, which is the detection result, to the control unit 7 described later. That is, the dirt amount detection unit 6 transmits a signal corresponding to the detected amount of dirt in the indoor air to the control unit 7 described later. Communication between the dirt amount detection unit 6 and the control unit 7 described later may be wireless communication such as infrared communication, Wi-Fi (registered trademark) or Bluetooth (registered trademark), or may be wired communication.

The first dirt amount detection unit 6a detects the dirt amount of the indoor air in the first area 210a by detecting the dirt amount in the first return air RA1, which is the indoor air in the first area 210a that flows through the first indoor air intake 3a. The second dirt amount detection unit 6b detects the dirt amount of the indoor air in the second area 210b by detecting the dirt amount in the second return air RA2, which is the indoor air in the second area 210b that flows through the second indoor air intake 3b.

The dirt amount detection unit 6 is, for example, a _CO2 sensor that detects the carbon dioxide concentration of the indoor air, which is the amount of dirt. The dirt amount detection unit 6 is not limited to a _CO2 sensor, and a detection device that can detect the amount of dirt in the air, such as a PM2.5 sensor or a dust sensor, can be used. In the following, an example will be described in which the dirt amount detection unit 6 is a _CO2 sensor. The dirt amount detection unit 6 detects the _CO2 concentration in the indoor air flowing through the exhaust air duct 8, and outputs a signal corresponding to the detected _CO2 concentration to the control unit 7 described later.

The control unit 7 sets the opening/closing amount of the suction port opening/closing unit 4, the opening/closing time of the suction port opening/closing unit 4, and the air volume of the blower 5 in response to the amount of dirt in the indoor air detected by the dirt amount detection unit 6, and issues operating instructions to the suction port opening/closing unit 4 and the blower 5. In other words, the control unit 7 controls the operating operation of the ventilation device 100 in response to the signal input from the dirt amount detection unit 6.

The control unit 7 controls the blower 5 based on the acquired information on the amount of dirt in the indoor air to control the ventilation operation of the ventilation device 100. The control unit 7 acquires the amount of dirt in the indoor air in the first area 210a and the amount of dirt in the indoor air in the second area 210b from the dirt amount detection unit 6. That is, the control unit 7 receives a signal corresponding to the amount of dirt in the indoor air in the first area 210a detected by the first dirt amount detection unit 6a from the first dirt amount detection unit 6a. The control unit 7 also receives a signal corresponding to the amount of dirt in the indoor air in the second area 210b detected by the second dirt amount detection unit 6b from the second dirt amount detection unit 6b.

The control unit 7 also controls the operation and stopping of the blower 5, and controls the air volume of the blower 5, thereby controlling the ventilation operation. That is, the control unit 7 is capable of communicating with the blower 5 via a communication line (not shown), and controls the air volume of the blower 5 to control the ventilation air volume. The control unit 7 automatically controls the air volume of the blower 5 to change the ventilation air volume, based on the operation mode selected by the user on the remote controller 20.

The control unit 7 also controls the air volume of the blower 5 to change the ventilation air volume based on the amount of dirt in the indoor air in the first area 210a, the amount of dirt in the indoor air in the second area 210b, and a judgment threshold previously set in the control unit 7. That is, the control unit 7 controls the air volume of the blower 5 to change the ventilation air volume based on the magnitude relationship between the amount of dirt in the indoor air in the first area 210a, the amount of dirt in the indoor air in the second area 210b, and the judgment threshold. The judgment threshold is previously set in the control unit 7. The judgment threshold can be changed to any value by operating the remote controller 20.

For example, the control unit 7 receives a signal transmitted from the dirt level detection unit 6. The control unit 7 then controls the operation of the ventilation device 100 by changing the ventilation air volume based on the magnitude relationship between the dirt level indicated by the received signal and the judgment threshold. In other words, the control unit 7 controls the operation of the ventilation device 100 to switch to an operation mode with a different ventilation air volume based on the dirt level of the indoor air.

The control unit 7 can therefore control the operation of the ventilation device 100 to switch between operating modes with different ventilation air volumes based on the amount of contamination of the indoor air in the first area 210a and the amount of contamination of the indoor air in the second area 210b.

The first suction port opening/closing section 4a, the second suction port opening/closing section 4b, the blower 5, the control section 7 and the exhaust air duct 8 are provided inside the housing 1.

Next, the operation of the ventilation device 100 according to the first embodiment will be described. FIG. 3 is a flowchart showing the procedure of the ventilation operation in the ventilation device according to the first embodiment. FIG. 4 is a diagram showing a condition setting table showing the operation control conditions in the ventilation device according to the first embodiment. The control unit 7 controls the opening degree of the intake opening/closing unit 4 and the air volume of the blower 5 based on any one of the operation control conditions, Condition 1 to Condition 4, set in the condition setting table shown in FIG. 4, to control the exhaust air volume of the ventilation device 100. The condition setting table is stored in advance in the control unit 7.

The air volume of the blower 5 has two notches, with the larger air volume being “strong air volume” and the smaller air volume being “weak air volume.” The control unit 7 controls the operation of the ventilation device 100 by setting the opening/closing ratio of the first suction port opening/closing unit 4a and the second suction port opening/closing unit 4b and the air volume of the blower 5 based on the detection result of the _CO2 concentration of the indoor air by the dirt amount detection unit 6.

In step S10, the user operates the remote controller 20 to turn on the power of the ventilation device 100. This causes power to be supplied to the ventilation device 100, and detection of the _CO2 concentrations in the first area 210a and the second area 210b in the room 210 is started.

In step S20, the control unit 7 controls the first suction port opening/closing unit 4a, which opens and closes the first indoor air suction port 3a, and the second suction port opening/closing unit 4b, which opens and closes the second indoor air suction port 3b, to be fully opened in order to detect the _CO2 concentration of the indoor air in the first area 210a and the second area 210b.

In step S30, the control unit 7 determines whether the stabilization time t1 has elapsed. The stabilization time t1 is the waiting time until the air flowing through the exhaust air duct 8 stabilizes and the only indoor air flowing through the exhaust air duct 8 is indoor air. After the stabilization time t1 has elapsed, the air that was stagnant in the indoor exhaust ducts 10a and 10b before power was supplied to the ventilation device 100 has been sent to the outdoor 230 side of the dirt amount detection unit 6, and the only air passing through the dirt amount detection unit 6 is the indoor air in the first area 210a and the second area 210b.

If it is determined that the stable time t1 has elapsed, the answer is Yes in step S30 and the process proceeds to step S40. If it is determined that the stable time t1 has not elapsed, the answer is No in step S30 and the process repeats step S30.

In step S40, the first dirt amount detection unit 6a detects a _CO2 concentration X1, which is the CO2 concentration in the first return air RA1, which is the indoor air of the first area 210a, and the second dirt amount detection unit 6b detects a _CO2 concentration X2, which is the _CO2 concentration in the second return air RA2, which is the indoor air of the second area 210b. The dirt amount detection unit 6 transmits information on _{the CO2} concentrations X1 and X2, which are the detection results, to the control unit 7.

The air volume of the blower 5 in steps S20 to S40 may be either high or low.

In step S50, the control unit 7 compares the _CO2 concentration X1, which is the _CO2 concentration of the indoor air in the first area 210a, with a threshold Y1 to determine whether the _CO2 concentration X1 is equal to or greater than the threshold Y1. The threshold Y1 is a determination threshold that the control unit 7 compares with the _CO2 concentration X1 to determine the operation control condition.

If it is determined that the _CO2 concentration X1 of the indoor air in the first region 210a is equal to or greater than the threshold value Y1, the result in step S50 is Yes, and the process proceeds to step S60. If it is determined that the _CO2 concentration X1 of the indoor air in the first region 210a is less than the threshold value Y1, the result in step S50 is No, and the process proceeds to step S70. In FIG. 4, the first region 210a is indicated as "high" when the _CO2 concentration X1 is equal to or greater than the threshold value Y1, and indicated as "low" when the _CO2 concentration X1 is less than the threshold value Y1.

In step S60, the control unit 7 compares the _CO2 concentration X2, which is the _CO2 concentration of the indoor air in the second region 210b, with a threshold Y2 to determine whether the _CO2 concentration X2 is equal to or greater than the threshold Y2. The threshold Y2 is a determination threshold that the control unit 7 compares with the _CO2 concentration X2 to determine the operation control condition.

If the _CO2 concentration X2 of the indoor air in the second region 210b is equal to or greater than the threshold Y2, the result in step S60 is Yes, and the process proceeds to step S80. If the _CO2 concentration X2 of the indoor air in the second region 210b is less than the threshold Y2, the result in step S60 is No, and the process proceeds to step S90. In FIG. 4, the case where the _CO2 concentration X2 of the second region 210b is equal to or greater than the threshold Y2 is indicated as "high," and the case where the _CO2 concentration X2 is less than the threshold Y2 is indicated as "low."

In step S80, the control unit 7 determines the operation control condition to be condition 1.

In step S90, the control unit 7 determines the operation control condition to be condition 2.

In step S70, the control unit 7 compares the _CO2 concentration X2, which is the _CO2 concentration of the indoor air in the second region 210b, with a threshold Y2 to determine whether the _CO2 concentration X2 is equal to or greater than the threshold Y2. If the _CO2 concentration X2 of the indoor air in the second region 210b is equal to or greater than the threshold Y2, the result in step S70 is Yes, and the process proceeds to step S100. If the _CO2 concentration X2 of the indoor air in the second region 210b is less than the threshold Y2, the result in step S70 is No, and the process proceeds to step S110.

In step S100, the control unit 7 determines the operation control condition to be condition 3.

In step S110, the control unit 7 determines the operation control condition to be condition 4.

That is, the control unit 7 determines the operation control condition to be one of four operation control conditions, condition 1 to condition 4, shown in FIG. 4, depending on the _CO2 concentration in the first region 210a and the _CO2 concentration in the second region 210b.

In step S120, the control unit 7 controls the operation of the ventilation device 100 in response to the operation control condition determined from among conditions 1 to 4. That is, the control unit 7 sets the opening/closing ratio of the first suction port opening/closing unit 4a, the opening/closing ratio of the second suction port opening/closing unit 4b, and the air volume of the blower 5 in response to one of conditions 1 to 4, and operates the first suction port opening/closing unit 4a, the second suction port opening/closing unit 4b, and the blower 5 under the set conditions.

Here, we will explain each of the conditions 1, 2, 3, and 4 shown in the condition setting table shown in Figure 4.

Condition 1 is an operational control condition for setting the air volume of the blower 5 to a high volume because the _CO2 concentration in the indoor air is high in both the first area 210a and the second area 210b and ventilation with a large air volume is required. Condition 1 is an operational control condition for setting the opening/closing ratio of the first suction port opening/closing unit 4a and the opening/closing ratio of the second suction port opening/closing unit 4b because ventilation is required in both the first area 210a and the second area 210b.

The opening/closing ratio of the suction port opening/closing unit 4 is set, for example, in accordance with the ratio of the _CO2 concentration of each region to the total value of the _CO2 concentration of the _CO2 concentration X1 and the _CO2 concentration X2. For example, if the full opening of the suction port opening/closing unit 4 is an opening/closing ratio of 100%, and the _CO2 concentration X1 = 2000 ppm and the _CO2 concentration X2 = 1000 ppm, the opening/closing ratio of the first suction port opening/closing unit 4a = 100% x (2000 ppm/3000 ppm) = 67%, and the opening/closing ratio of the second suction port opening/closing unit 4b = 100% x (1000 ppm/3000 ppm) = 33%. In this way, by determining the opening degree of the first suction port opening/closing unit 4a and the opening/closing ratio of the second suction port opening/closing unit 4b, it is possible to ventilate the region with a higher _CO2 concentration preferentially.

Condition 2 is an operation control condition in which the blower 5 is operated at a high air volume because the _CO2 concentration of the indoor air in the first area 210a is high and ventilation with a large air volume is required. Condition 2 is also a state in which ventilation is required only in the first area 210a because the _CO2 concentration of the indoor air in the first area 210a is high but the _CO2 concentration of the indoor air in the second area 210b is low. Therefore, condition 2 is an operation control condition in which the first suction port opening/closing section 4a is fully opened and the second suction port opening/closing section 4b is fully closed or at a predetermined opening/closing ratio. Therefore, in condition 2, the first area 210a, in which the _CO2 concentration of the indoor air is high, can be preferentially ventilated.

Condition 3 is an operation control condition in which the blower 5 is operated at a high air volume because the _CO2 concentration of the indoor air in the second area 210b is high and ventilation with a large air volume is required. Condition 3 is also a state in which the _CO2 concentration of the indoor air in the first area 210a is low, but the _CO2 concentration of the indoor air in the second area 210b is high, so ventilation is required only in the second area 210b. Therefore, condition 3 is an operation control condition in which the first suction port opening/closing section 4a is fully closed or at a predetermined opening/closing ratio, and the second suction port opening/closing section 4b is fully opened. Therefore, in condition 3, the second area 210b with a high _CO2 concentration can be ventilated preferentially.

Condition 4 is an operation control condition in which the air volume of the blower 5 is set to a low volume because the _CO2 concentration of the indoor air in both the first area 210a and the second area 210b is low and ventilation is possible even with a small air volume. The opening degree of the suction port opening/closing unit 4 may be set to a 50% opening/closing ratio for both the first suction port opening/closing unit 4a and the second suction port opening/closing unit 4b, for example, or may be set corresponding to the ratio of the _CO2 concentration of the indoor air in each area of the room 210, as in condition 1.

In addition, since the _CO2 concentration of the indoor air in each area is constantly changing due to an increase or decrease in the number of people entering and exiting the room 210 and the movement of people within the room 210, it is preferable to regularly check the _CO2 concentration of the indoor air in the first area 210a and the second area 210b.

Therefore, in step S130, the control unit 7 determines whether the operation time t2 has elapsed. The operation time t2 is the time during which the ventilation device 100 performs ventilation operation based on any one of conditions 1 to 4.

If it is determined that the operation time t2 has elapsed, the answer is Yes in step S130, and the process proceeds to step S20. If it is determined that the operation time t2 has not elapsed, the answer is No in step S130, and step S130 is repeated. By periodically performing the processes from step S20 to step S120, it is possible to constantly and efficiently reduce the _CO2 concentration in the room 210.

As described above, the ventilation device 100 includes a plurality of dirt amount detection units 6 that detect the _CO2 concentration of the indoor air, and operates according to the flowchart shown in Fig. 4, and is able to identify spaces with high _CO2 concentration in the indoor air and spaces with low _CO2 concentration in the indoor air based on the detection results of the dirt amount detection units 6, and is able to ventilate the areas with high _CO2 concentration in the indoor air with priority. Also, the ventilation device 100 can control the ventilation of the room 210 by a single control unit 7.

The ventilation device 100 is provided with multiple dirt level detection units 6 that detect the dirt levels of the indoor air in each area, so that it is inexpensive, does not require a large space, is easy to install, requires less maintenance, and consumes less power. Therefore, compared to a case where multiple ventilation devices are used to ventilate the room 210, the ventilation device 100 has a simple structure and can achieve easier control, lower costs, space saving, fewer maintenance times, and lower power consumption. In addition, the ventilation device 100 can set both the opening and closing amount of the first suction port opening and closing unit 4a and the second suction port opening and closing unit 4b and the air volume of the blower 5 under the control of the control unit 7, so that it is possible to finely adjust the ventilation volume required for ventilation of the target space.

The stabilization time t1 may be preset in the control unit 7, or may be arbitrarily set by the remote controller 20, etc. Instead of the stabilization time t1, the change in the _CO2 concentration of the indoor air may be calculated as a slope, and if the slope is equal to or less than a predetermined threshold, it may be determined that the _CO2 concentration of the indoor air is stable, and the _CO2 concentration of the indoor air at that time may be detected.

In the above description, the determination threshold for comparison with the _CO2 concentration of the indoor air in each space in the room 210 is one, and the air volume of the blower 5 is two notches, a strong air volume and a weak air volume, but the determination threshold for the _CO2 concentration of the indoor air and the air volume of the blower 5 may be multi-staged. For example, the determination threshold for comparison with the _CO2 concentration of the indoor air may be two stages, high and low, the air volume may be strong air volume, medium air volume, and weak air volume, and if the _CO2 concentration of the indoor air in the first area 210a is high and the _CO2 concentration of the indoor air in the second area 210b is low, the air volume may be medium air volume.

In the above, the opening/closing ratio of the first suction port opening/closing unit 4a and the opening/closing ratio of the second suction port opening/closing unit 4b are set according to the conditions, but the opening/closing ratio of the first suction port opening/closing unit 4a and the opening/closing ratio of the second suction port opening/closing unit 4b may be fixed in stages according to the values of the CO2 concentration X1 and the _CO2 concentration X2, or may be set arbitrarily by the remote controller 20 or the like. For example, when the _CO2 concentration X1 and the CO2 concentration X2 are 1000 ppm or less, the opening/closing ratio of the first suction port opening/closing unit 4a and the opening/closing ratio of the second suction port opening/closing unit 4b are set to 30%. Also, when the _CO2 concentration X1 and _{the CO2} concentration X2 are 1001 _ppm or more and 1500 ppm or less, the opening/closing ratio of the first suction port opening/closing unit 4a and the opening/closing ratio of the second suction port opening/closing unit 4b are set to 60%. Furthermore, when the _CO2 concentration X1 and the _CO2 concentration X2 are 1501 ppm or more, the opening/closing ratio of the first suction port opening/closing unit 4a and the second suction port opening/closing unit 4b is set to 100%. Note that these conditions are merely examples.

The ventilation device 100 according to the first embodiment can efficiently reduce air pollution throughout the room with a simple configuration and control.

Embodiment 2.
5 is a schematic diagram showing the configuration of a ventilation device according to embodiment 2. The ventilation device 100 according to embodiment 2 differs from the ventilation device 100 according to embodiment 1 in that it includes a first indoor display unit 21a and a second indoor display unit 21b. The first indoor display unit 21a is provided at a position visible from the first area 210a. The second indoor display unit 21b is provided at a position visible from the second area 210b.

The first indoor display unit 21a receives a comparison result between the _CO2 concentration X1 of the first return air RA1, which is the indoor air of the first region 210a, and the threshold value Y1 from the control unit 7. The first indoor display unit 21a changes to a display method set in advance according to the received result. For example, the first indoor display unit 21a turns on if the _CO2 concentration X1 is equal to or greater than the threshold value Y1, and turns off if the _CO2 concentration X1 is less than the threshold value Y1. The second indoor display unit 21b receives a comparison result between the _CO2 concentration X2 of the second return air RA2, which is the indoor air of the second region 210b, and the threshold value Y2 from the control unit 7. The second indoor display unit 21b changes to a display method set in advance according to the received result. For example, the second indoor display unit 21b turns on if the _CO2 concentration X2 is equal to or greater than the threshold value Y2, and turns off if the _CO2 concentration X2 is less than the threshold value Y2.

The ventilation device 100 according to the second embodiment makes it possible to visually check the state of air pollution in the room 210.

Embodiment 3.
6 is a schematic diagram showing the configuration of a ventilation device according to embodiment 3. The ventilation device 100 according to embodiment 3 differs from the ventilation device 100 according to embodiment 2 in that the first indoor display unit 21a and the second indoor display unit 21b are provided on the remote controller 20.

According to the ventilation device 100 of the third embodiment, the air pollution state in the room 210 can be visually checked using the remote controller 20. Furthermore, if the remote controller 20 is installed in a space other than the room 210, the air pollution state in the room 210 can be visually checked from the other space.

Next, the hardware configuration of the control unit 7 of the ventilation device 100 according to each of the above embodiments will be described. FIG. 7 is a diagram showing an example of the hardware configuration of the control unit of the ventilation device according to embodiments 1 to 3. FIG. 7 shows the hardware configuration in the case where the function of the control unit 7 is realized by using hardware that executes a program.

The control unit 7 has a processor 81 that executes various processes, a memory 82 that is an internal memory, and a storage device 83 that stores information. The processor 81 reads out a program stored in the storage device 83 into the memory 82 and executes it. The condition setting table, the stable time t1, the operating time t2, and the thresholds Y1 and Y2 are stored in the storage device 83.

The configurations shown in the above embodiments are merely examples of the contents, and may be combined with other known technologies, and parts of the configurations may be omitted or modified without departing from the spirit of the invention.

1 housing, 2 exhaust port, 3 indoor air intake port, 3a first indoor air intake port, 3b second indoor air intake port, 4 intake port opening/closing section, 4a first intake port opening/closing section, 4b second intake port opening/closing section, 5 blower, 5a motor, 6 dirt amount detection section, 6a first dirt amount detection section, 6b second dirt amount detection section, 7 control section, 8 exhaust air duct, 9 outdoor exhaust duct, 10a, 10b indoor exhaust duct, 20 remote controller, 21a first indoor display section, 21b second indoor display section, 81 processor, 82 memory, 83 storage device, 100 ventilation device, 200 ceiling, 210 indoors, 210a first area, 210b second area, 220 ceiling, 230 outdoors.

Claims (4)

A housing provided with a plurality of intake ports and an exhaust port, each of which is provided corresponding to a plurality of different ventilation target areas in a room;
a blower disposed within the housing and generating a flow of indoor air from the air inlet to the air outlet;
A plurality of suction port opening/closing units that open and close each of the plurality of suction ports;
a plurality of dirt amount detection units provided at the plurality of suction ports, each detecting a dirt amount of the indoor air passing through each of the plurality of suction ports;
a control unit that controls an opening/closing operation of the intake opening/closing unit and an air volume of the blower based on a dirt amount of the indoor air in each of the plurality of ventilation target areas;
Equipped with
The ventilation device is characterized in that the suction port opening and closing unit selects the ventilation target area to be ventilated preferentially based on the multiple amounts of dirt, fully opens the suction port opening and closing unit of the ventilation target area to be ventilated preferentially, and opens and closes the suction port opening and closing unit of the other ventilation target areas at a predetermined opening and closing ratio. The ventilation device according to claim 1 , wherein the control unit adjusts an air volume of the blower in response to a detection result of an amount of contamination of the indoor air passing through each of the plurality of air inlets. 3. The ventilation device according to claim 1, further comprising a detection result display unit that displays a detection result of the amount of contamination of the indoor air passing through each of the plurality of air inlets. 4. The ventilation device according to claim 3 , further comprising a remote controller, wherein the detection result display unit is provided on the remote controller.

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