Blower system

Abstract

To provide an air blowing system capable of suppressing inflow of contaminants contained in outside air into a building and suppressing exposure of a user in the building to the contaminants.SOLUTION: The blowing system is provided in a building in which a first space and a second space are formed. The second space is provided with an opening / closing body capable of opening and closing an opening communicating with the outside. The air blowing system includes an air blowing device provided in an air passage communicating a first space and a second space, and an environmental information acquisition means. The blowing device starts blowing the air in the first space to the second space when a preset start condition is satisfied while the blowing device is stopped. The environmental information acquisition means acquires information on the concentration of the pollutant in the outside air. The start condition is that the pollutant concentration of the outside air is equal to or higher than a preset first reference pollutant concentration.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a ventilation system. [Background technology]

[0002] In a system equipped with an air purifier that purifies indoor air, a ventilation device that ventilates the indoor air, and a dirt sensor that detects the concentration of dirt in the indoor air, there is known a system that controls the air purification capacity of either the air purifier or the ventilation device, or both, depending on the concentration of dirt in the indoor air detected by the dirt sensor (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 05-015728 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in systems such as those described in Patent Document 1, no consideration is given to outdoor air pollution, and so operating the ventilation system may result in outdoor polluted air flowing indoors, potentially increasing the level of indoor air pollution. Furthermore, even if the level of indoor air pollution increases, control to increase the air purification capacity cannot be performed until the contamination sensor detects indoor air pollution. This makes it difficult to quickly eliminate indoor air pollution. Furthermore, by the time pollution is detected, the pollution has already begun to spread, potentially extending the time required to purify the pollution.

[0005] The present disclosure has been made to solve these problems, and its purpose is to provide a ventilation system that can suppress the inflow of pollutants contained in outside air into a room and can suppress an increase in the concentration of pollutants in the indoor air due to pollution of the outside air. [Means for solving the problem]

[0006] The air supply system according to the present disclosure is an air supply system installed in a building in which a first space and a second space are formed, wherein the second space is provided with at least one opening / closing body, such as a door or a window, that can open and close an opening connecting the second space to the outdoors, and the system is equipped with an air supply device that introduces outside air into the first space, an air supply device installed in an air duct connecting the first space to the second space, and an environmental information acquisition means, wherein the air supply device starts blowing air from the first space to the second space when a predetermined start condition is met while the air supply device is stopped, and the environmental information acquisition means acquires information regarding the concentration of pollutants in the outside air, and the start condition is that the concentration of pollutants in the outside air is equal to or greater than a predetermined first standard pollutant concentration. [Effects of the Invention]

[0007] The ventilation system according to the present disclosure has the advantage of being able to prevent pollutants contained in the outside air from flowing indoors, thereby preventing an increase in the concentration of pollutants in the indoor air due to pollution in the outside air. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a plan view schematically showing an example of a building to which the air blowing system according to Embodiment 1 is applied. [Figure 2] FIG. 2 is a cross-sectional view taken along line YY in FIG. [Figure 3] 1 is a block diagram showing the configuration of a control system of the air blowing system according to the first embodiment. [Figure 4] 4 is a flow chart showing an example of the operation of the air blowing system according to the first embodiment. [Figure 5] FIG. 4 is a plan view schematically showing another example of a building to which the air blowing system according to the first embodiment is applied. [Figure 6] FIG. 6 is a cross-sectional view taken along the line AA in FIG. 5. [Figure 7] FIG. 6 is a cross-sectional view taken along the line BB in FIG. 5. [Figure 8] 10 is a diagram showing airflow when the blower is stopped in another example of the blower system according to the first embodiment. FIG. [Figure 9] 10 is a diagram showing airflow during operation of the blower device in another example of the blower system according to the first embodiment. FIG. [Figure 10] FIG. 2 is a diagram illustrating an example of a configuration for realizing the functions of a control device of a ventilation system according to the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0009] An embodiment of the air blowing system according to the present disclosure will be described with reference to the accompanying drawings. In each drawing, the same or corresponding parts are designated by the same reference numerals, and redundant explanations are appropriately simplified or omitted. For convenience, the following description may express the positional relationship of each structure based on the illustrated state. Note that the present disclosure is not limited to the following embodiments, and any combination of the embodiments, any modification of any component of each embodiment, or any omission of any component of each embodiment are possible within the scope of the present disclosure.

[0010] Embodiment 1 A first embodiment of the present disclosure will be described with reference to FIGS. 1 to 10. FIG. 1 is a plan view schematically showing an example of a building to which a ventilation system is applied. FIG. 2 is a cross-sectional view taken along section YY in FIG. 1. FIG. 3 is a block diagram showing the configuration of a control system for the ventilation system. FIG. 4 is a flow diagram showing an example of the operation of the ventilation system. FIG. 5 is a plan view schematically showing another example of a building to which a ventilation system is applied. FIG. 6 is a cross-sectional view taken along section AA in FIG. 5. FIG. 7 is a cross-sectional view taken along section BB in FIG. 5. FIG. 8 is a diagram showing airflow in another example of a ventilation system when the ventilation device is stopped. FIG. 9 is a diagram showing airflow in another example of a ventilation system when the ventilation device is operating. FIG. 10 is a diagram showing an example of a configuration for implementing the functions of a control device for a ventilation system.

[0011] FIG. 1 is a schematic diagram illustrating an example of a building 10 in which a ventilation system according to this embodiment is installed. As shown in the figure, the building 10 has one or more rooms. In the illustrated example, a first space 11 and a second space 12 are formed as the interior spaces of the rooms. The first space 11 is, for example, the interior space of a living room. As defined in Article 2, Paragraph 4 of the Building Standards Act, a living room is a room that is continuously used for living, working, meeting, recreation, or other similar purposes. Specific examples of living rooms include a living room, dining room, kitchen, Japanese-style room, bedroom, etc.

[0012] The second space 12 is, for example, the interior space of a non-habitable room. A non-habitable room is a room other than an occupant room provided in the building 10. Specific examples of a non-habitable room include a toilet (restroom), a bathroom, a dressing room, a washroom, a laundry room, and a walk-in closet.

[0013] A first door 14 is provided between the first space 11 and the second space 12. A second door 15 that leads to the outdoors is provided in the second space 12. In a building 10 in which the ventilation system according to this embodiment is installed, an opening / closing body is provided in the second space 12. The opening / closing body is at least one of a door and a window that can open and close an opening that connects the second space 12 to the outdoors. The second door 15 is an example of an opening / closing body provided in the second space 12.

[0014] An air intake device 51 is provided on the outer wall of the first space 11. The air intake device 51 is an air intake port that allows outside air to flow into the first space 11. The air intake device 51 may also include an air intake fan for drawing the outside air into the first space 11. The air intake device 51 may also include a filter (not shown). The filter captures pollutants contained in the air passing through the air intake device 51, i.e., the outside air, and removes the pollutants from the air passing through the air intake device 51. Pollutants that can be captured by the filter include, for example, at least one of the pollutants about which information on the concentration in the outside air is acquired by the environmental information acquisition means described below. For example, a HEPA (High Efficiency Particulate Air) filter, a ULPA (Ultra Low Penetration Air) filter, an electrostatic filter, etc. can be used as this filter.

[0015] As shown in Figures 1 and 2, a duct 20 is provided above the ceiling of the first space 11 and the second space 12. One end of the duct 20 is connected to an intake port 21 formed in the ceiling of the first space 11. The other end of the duct 20 is connected to an outlet port 22 formed in the ceiling of the second space 12. An air passage that connects the first space 11 and the second space 12 is formed inside the duct 20. A blower 30 is provided in the middle of the duct 20. The blower 30 has a built-in fan.

[0016] When the blower 30 operates, that is, when the fan of the blower 30 operates, an airflow is generated in the air passage in the duct 20, flowing from the first space 11 to the second space 12. When the blower 30 operates, air in the first space 11 is drawn into the duct 20 through the intake port 21. The air drawn into the duct 20 flows toward the second space 12 and is blown out into the second space 12 through the outlet port 22. In this way, the blower 30 blows the air in the first space 11 into the second space 12.

[0017] The air passage connecting the first space 11 and the second space 12 is not limited to the duct 20 installed above the ceiling. Alternatively, for example, if the first space 11 and the second space 12 are adjacent rooms as shown in Figures 1 and 2, an air passage connecting the first space 11 and the second space 12 may be formed by a duct or the like provided through the wall separating the first space 11 and the second space 12.

[0018] The arrangement of the first space 11 and the second space 12 is not limited to the example in Figures 1 and 2. Even when the first door 14 is closed, air can flow between the first space 11 and the second space 12 through a path other than the air passage in the duct 20 described above, for example, through a gap such as an undercut in the first door 14, or through a vent provided in the first door 14 or a wall.

[0019] The air blowing system according to this embodiment includes a control device 100 as shown in Fig. 1. The control device 100 controls the operation of the air blowing device 30. As shown in Fig. 3, the control device 100 includes an information acquisition unit 111 and a control unit 112. The information acquisition unit 111 acquires various pieces of information necessary for the operation of the air blowing device 30. The control unit 112 controls the operation of the air blowing device 30 based on the information acquired by the information acquisition unit 111. As shown in the figure, the air blowing system includes an environmental sensor 60. The environmental sensor 60 is a sensor that detects physical quantities related to one or both of the internal and external environments of the building 10.

[0020] Specific examples of physical quantities related to the external environment of the building 10 detected by the environmental sensor 60 include the following:

[0021] PM (Particulate Matter) concentration in the air outside the building 10 -VOC (Volatile Organic Compounds) concentration in the outside air Outdoor pollen concentration

[0022] The environmental sensor 60 has a sensor corresponding to the physical quantity to be detected, and the sensor is basically installed at the location to be detected.

[0023] The information acquisition unit 111 periodically acquires the detection results of the environmental sensor 60 (for example, every few minutes). The environmental sensor 60 and the information acquisition unit 111 constitute an environmental information acquisition means for acquiring environmental information. The control device 100 is also communicably connected to an external device 70 via a communication line 200 such as the Internet. The external device 70 is, for example, a server that provides weather information. The information acquisition unit 111 of the control device 100 acquires weather information from the external device 70 via the communication line 200. The weather information includes physical quantities related to the external environment. Specific examples of physical quantities related to the external environment included in the weather information acquired from the external device 70 include the following:

[0024] -Amount of pollen in the air Outdoor yellow dust and PM2.5 airborne concentrations Photochemical oxidant concentration in the ambient air Outdoor VOC concentration

[0025] In this way, the environmental information acquisition means may acquire physical quantities related to the environment from the external device 70 via the communication line 200. In this way, the environmental information acquisition means acquires information related to the concentration of pollutants in the outside air. Specific examples of pollutants include at least one of PM (including yellow sand, PM2.5, SPM (Suspended Particulate Matter), dust, soot, etc.), pollen, VOCs, and photochemical oxidants. The information related to the concentration of pollutants in the outside air acquired by the environmental information acquisition means may be an actual measured value of the concentration of pollutants in the outside air, or a predicted or estimated value.

[0026] The control unit 112 of the control device 100 controls the operation of the blower 30 in accordance with the detection results of the environmental sensor 60 and information from the external device 70 acquired by the information acquisition unit 111, that is, in accordance with the environmental information acquired by the environmental information acquisition means. In particular, the control unit 112 controls the operation of the blower 30 in accordance with the information on the concentration of pollutants in the outside air acquired by the environmental information acquisition means.

[0027] The control unit 112 of the control device 100 starts the operation of the air blower 30 when a preset start condition is met while the air blower 30 is stopped. That is, when the start condition is met while the air blower 30 is stopped, the air blower 30 starts blowing air from the first space 11 to the second space 12.

[0028] Next, we will explain examples of conditions for starting the operation of the blower device 30. A first example of a condition for starting the operation of the blower device 30 is that the concentration of pollutants in the outside air is equal to or higher than a preset first reference pollutant concentration.

[0029] When an actual measurement value of the concentration of pollutants in the outdoor air is used as the information regarding the concentration of pollutants in the outdoor air, the environmental sensor 60 can detect the concentration of at least one type of pollutant in the outdoor air, and the information acquisition unit 111 acquires the actual measurement value of the concentration of pollutants in the outdoor air detected by the environmental sensor 60 as the information regarding the concentration of pollutants in the outdoor air. When a predicted value of the concentration of pollutants in the outdoor air is used as the information regarding the concentration of pollutants in the outdoor air, the information acquisition unit 111 acquires, for example, a predicted value of the concentration of pollutants in the area where the building 10 is located from a weather information server that is an external device 70. Alternatively, the control device 100 may include a prediction unit (not shown) that predicts the concentration of pollutants in the outdoor air, and the information acquisition unit 111 may acquire the predicted value of the concentration of pollutants in the outdoor air from the prediction unit of the control device 100.

[0030] Then, the control unit 112 of the control device 100 starts the operation of the air blower 30 when the pollutant concentration in the outside air acquired by the information acquisition unit 111 is equal to or higher than a first standard pollutant concentration. The first standard pollutant concentration is, for example, a pollen count of 15 particles / cm^2. In this way, when the amount of pollen is relatively high, such as when the pollutant concentration (pollen count) in the outside air is 15 particles / cm^2 or higher, the air from the first space 11 is allowed to flow into the second space 12, thereby preventing the outside air and pollutants in the outside air from flowing into the building 10 through the opening / closing body (second door 15).

[0031] Here, when the blower 30 is stopped, for example, if the temperature inside the building 10 (room temperature) is higher than the temperature outside the building 10 (outdoor air temperature), the air density inside the building 10 becomes lower than the air density outside, causing a pressure difference between the inside and outside of the building 10, and outside air flows from the outdoors into the second space 12 through gaps (undercuts, etc.) in the second door 15 or through vents, etc. In another example, when the blower 30 is stopped and the wind direction around the building 10 has a component perpendicular to the installation surface of the second door 15, when wind blows into the building 10, wind pressure acts on the outdoor side of the second door 15 in addition to atmospheric pressure, so that the pressure on the outdoor side of the second door 15 is greater than the pressure in the second space 12, i.e., the pressure on the indoor side of the second door 15. Therefore, due to this pressure difference inside and outside the second door 15, outside air flows from the outdoors into the second space 12 through gaps in the second door 15 or through vents, etc.

[0032] In contrast, when the blower device 30 is operated, the air in the first space 11 is blown into the second space 12. This increases the pressure in the second space 12, creating a positive pressure in the second space 12. Therefore, the air in the second space 12 is discharged to the outdoors through a gap in the second door 15, a vent, or the like. Meanwhile, the pressure in the first space 11 decreases, creating a negative pressure in the second space 12. Therefore, outside air flows into the first space 11 through the air supply device 51. At this time, pollutants in the outside air are removed by the filter in the air supply device 51.

[0033] According to the air blowing system configured as described above, when the start condition is satisfied, i.e., when the concentration of pollutants in the outside air is equal to or higher than the first standard pollutant concentration, the operation of the air blowing device 30 is started, thereby suppressing the inflow of outside air through gaps or vents in the second door 15. This makes it possible to suppress the inflow of pollutants contained in the outside air, suppress exposure of users in the building 10 to pollutants, and reduce user discomfort and adverse health effects.

[0034] A second example of a condition for starting the operation of the air blower 30 is when a user approaches the building 10 from outside the building 10. In this case, the control device 100 is provided with a location information acquisition unit (not shown). The location information acquisition unit of the control device 100 acquires information about the user's current location by using GPS or by communicating with a smartphone, smartwatch, or the like carried by the user. Alternatively, for example, the current location of the building 10 may be input into the control device 100 in advance, or the control device 100 installed in the building 10 may be equipped with a function for detecting the current location of the control device 100 itself using GPS, thereby allowing the location information acquisition unit of the control device 100 to acquire information about the current location of the building 10. A condition for starting the operation of the air blower 30 is set to be when the distance from the user's current location to the building 10 is equal to or shorter than a predetermined first reference distance. That is, the control unit 112 of the control device 100 starts the operation of the air blower 30 when the distance from the user's current location to the building 10 is equal to or shorter than the first reference distance.

[0035] A third example of a condition for starting the operation of the blower device 30 is when a person is present in the second space 12. In this case, for example, an infrared sensor, a camera, or the like is installed in the second space 12. The control device 100 is also provided with a person detection unit (not shown). The person detection unit of the control device 100 detects the presence or absence of a person in the second space 12 using the detection results of the infrared sensor or an image captured by the camera. The condition for starting the operation of the blower device 30 is set to be when a person is present in the second space 12. That is, the control unit 112 of the control device 100 starts the operation of the blower device 30 when a person is present in the second space 12.

[0036] A fourth example of a condition for starting the operation of the air blower 30 is when an intercom / doorphone installed in the building 10 rings. In this case, an intercom (doorphone) (not shown) is installed in the building 10. The control device 100 also includes an equipment operation status acquisition unit (not shown). The equipment operation status acquisition unit of the control device 100 communicates directly with the intercom (doorphone) installed in the building 10 or communicates via a HEMS (Home Energy Management System) or the like to acquire the operation status of the intercom (doorphone) and detects that the intercom (doorphone) has been operated. Note that "the intercom (doorphone) has been operated" here refers to the operation of the doorbell button on the intercom (doorphone). The operation of the intercom is set as a condition for starting the operation of the air blower 30. That is, the control unit 112 of the control device 100 starts the operation of the air blower 30 when the intercom is operated.

[0037] A fifth example of a condition for starting the operation of the blower device 30 is when the aforementioned opening / closing body, such as the second door 15, is knocked. In this case, the opening / closing body, such as the second door 15, is provided with, for example, a vibration sensor, a sound sensor, or the like. The control device 100 is also provided with a knock detection unit (not shown). The knock detection unit of the control device 100 detects a knock on the opening / closing body using the detection result of the vibration sensor or sound sensor. Then, the condition for starting the operation of the blower device 30 is set to when the opening / closing body is knocked. In other words, the control unit 112 of the control device 100 starts the operation of the blower device 30 when the opening / closing body is knocked.

[0038] A sixth example of a start condition for the operation of the blower device 30 is when the electric lock of the opening / closing body described above, such as the second door 15, is unlocked. In this case, the opening / closing body, such as the second door 15, is provided with an electric lock that locks and unlocks the opening / closing body. The control device 100 is also provided with a lock status acquisition unit (not shown). The lock status acquisition unit of the control device 100 communicates with the electric lock of the opening / closing body, or communicates with a smartphone, smartwatch, or the like on which an application that controls the electric lock is installed, and acquires the locked / unlocked state of the electric lock. Then, the start condition for the operation of the blower device 30 is set to when the electric lock of the opening / closing body is unlocked. In other words, the control unit 112 of the control device 100 starts the operation of the blower device 30 when the electric lock of the opening / closing body is unlocked.

[0039] The second to sixth examples of the start conditions for the operation of the air blower 30 described above are all cases where there is a possibility that the second door 15, which is an opening / closing body provided in the second space 12, will be opened. When the second door 15 is opened, the opening in the second door 15 becomes larger, and there is a possibility that even more outside air will flow into the second space. According to these second to sixth examples of the start conditions, by starting the operation of the air blower 30 in advance in anticipation of the opening of the second door 15, it is possible to increase the pressure in the second space 12 before the second door 15 opens and suppress the air that flows in from outside the building 10 when the second door 15 is opened.

[0040] It should be noted that a combination of two or more of the first to sixth examples of the start conditions for the operation of the blower device 30 described above may be used. In particular, it is desirable to make the first example of the start condition mandatory. For example, when the first and second examples are combined as the start condition, the start condition satisfies at least one of the following conditions: the pollutant concentration in the outside air is equal to or greater than the first reference pollutant concentration described above, and the distance to the building 10 where the user is currently located is equal to or less than the first reference distance described above. The same applies when the first example is combined with any of the third to sixth examples.

[0041] In the air blowing system according to this embodiment, the control unit 112 of the control device 100 stops the operation of the air blowing device 30 when a predetermined stop condition is met during operation of the air blowing device 30. That is, when the stop condition is met during operation of the air blowing device 30, the air blowing device 30 stops blowing air from the first space 11 to the second space 12. One example of a condition for stopping the operation of the air blowing device 30 is when the pollutant concentration of the outside air remains equal to or lower than a predetermined second standard pollutant concentration for a predetermined first standard time or longer. The second standard pollutant concentration is set to a value lower than the first standard pollutant concentration described above. For example, if the first standard pollutant concentration is 15 particles / cm^2 as described above, the second standard pollutant concentration is set to 5 particles / cm^2. The first standard time is, for example, one hour.

[0042] When the pollen count is low, it is expected that the amount of pollen entering through gaps in the second door 15 or air vents, etc., will be small even when the blower 30 is stopped. By stopping the operation of the blower 30 when the pollutant concentration in the outside air is low, unnecessary operation of the blower 30 can be suppressed, thereby reducing power consumption. On the other hand, if the blower 30 is immediately stopped in response to a decrease in the pollutant concentration in the outside air, if the decrease in the pollutant concentration is temporary, the pollutant concentration may rise again while the blower 30 is stopped, and outside air and pollutants may enter the building 10 through gaps in the second door 15, air vents, etc. By continuing to blow air using the blower 30 for a certain period of time even after the pollutant concentration in the outside air has decreased to a certain extent, it is possible to suppress a re-rise in the pollutant concentration inside the building 10. Furthermore, by stopping the operation of the blower 30 when the pollutant concentration in the outside air is low, it is possible to suppress an increase in the air conditioning load inside the building 10.

[0043] The operation of the air blower device 30 may be started or stopped based on a user instruction. That is, the start condition, the stop condition, or both may include a user instruction. The user can start or stop the operation of the air blower device 30, for example, by operating a remote control (not shown) or a mobile terminal (not shown) carried by the user, such as a smartphone. In this case, regardless of whether the start condition based on the detection result of the environmental sensor 60 is satisfied, when the user performs an operation to start the operation of the air blower device 30, the control unit 112 of the control device 100 starts the operation of the air blower device 30. Furthermore, regardless of whether the stop condition based on the detection result of the environmental sensor 60 is satisfied, when the user performs an operation to stop the operation of the air blower device 30, the control unit 112 of the control device 100 stops the operation of the air blower device 30.

[0044] In this case, the remote controller, mobile terminal, etc. are input means by which the user inputs a start instruction or a stop instruction. The blower device 30 starts operating when a start instruction is input by the input means. The blower device 30 stops operating when a stop instruction is input by the input means.

[0045] Next, an example of the operation of the air blowing system according to this embodiment will be described with reference to the flow diagram of Fig. 4. First, in step S11, while the operation of the air blowing device 30 is stopped, the information acquisition unit 111 of the control device 100 acquires environmental information such as the detection results of the environmental sensor 60. Then, in the following step S12, the control unit 112 of the control device 100 determines whether the above-mentioned start condition is met. If the start condition is not met, the control device 100 returns to step S11 and continues the process. On the other hand, if the start condition is met, the control device 100 then performs the process of step S13.

[0046] In step S13, the control unit 112 of the control device 100 starts the operation of the blower device 30. In the following step S14, the control unit 112 of the control device 100 determines whether the above-mentioned stop condition is met. If the stop condition is not met, the control device 100 continues the operation of the blower device 30 until the stop condition is met. Then, if the stop condition is met, the control device 100 next performs the processing of step S15. In step S15, the control unit 112 of the control device 100 stops the operation of the blower device 30. When the processing of step S15 is completed, the series of operations ends.

[0047] In the air blowing system according to this embodiment, the air blowing device 30 may be equipped with an inverter and may be able to variably control the rotation speed of the fan. In this case, when a preset air blowing rate change condition is met, the control unit 112 of the control device 100 may change the rotation speed of the fan to change the air blowing rate of the air blowing device 30. In other words, when the air blowing rate change condition is met while the air blowing device 30 is operating, the air blowing device 30 changes the air blowing rate of the air blowing device 30.

[0048] Next, examples of conditions for changing the airflow rate will be described. A first example of a condition for changing the airflow rate is a change in the concentration of pollutants in the outside air. In this case, the control unit 112 increases the airflow rate of the blower device 30 as the concentration of pollutants in the outside air increases. That is, for example, the control unit 112 increases the airflow rate of the blower device 30 as the number of pollen particles in the outside air increases.

[0049] A second example of an airflow rate change condition is a change in wind direction around the building 10. In this case, the environmental information acquisition means further acquires the wind direction around the building 10 as a physical quantity related to the external environment of the building 10. For example, the environmental information acquisition means acquires the current value of wind direction observed by a weather station, meteorological observation station, weather observation station, AMeDAS observation station, or the like nearest to the building 10 from a weather information server, which is an external device 70. The environmental information acquisition means may include a wind vane as the environmental sensor 60. In this case, the control unit 112 may increase the airflow rate of the blower 30, for example, as the angle of the wind direction around the building 10 with respect to the installation surface of the second door 15 approaches a right angle. Note that the orientation of the installation surface of the second door 15 may be input to the control device 100 in advance.

[0050] A third example of the airflow rate change condition is a change in wind speed around the building 10. In this case, the environmental information acquisition means further acquires the wind speed around the building 10 as a physical quantity related to the external environment of the building 10. For example, the environmental information acquisition means acquires the current wind speed observed by a weather station, meteorological observation station, weather observation station, AMeDAS observation station, or the like nearest to the building 10 from a weather information server, which is the external device 70. The environmental information acquisition means may include an anemometer as the environmental sensor 60. In this case, the control unit 112 may increase the airflow rate of the fan device 30, for example, as the wind speed around the building 10 increases. Furthermore, the environmental information acquisition means may acquire both the wind direction and wind speed around the building 10, and the airflow rate of the fan device 30 may increase as the component of the wind speed around the building 10 that is perpendicular to the installation surface of the second door 15 increases.

[0051] A fourth example of an airflow rate change condition is a change in the difference between the outside air temperature and the room temperature. In this case, the environmental information acquisition means further acquires the outside air temperature, which is the temperature of the air outside the building 10, as a physical quantity related to the external environment of the building 10. For example, the environmental information acquisition means acquires the current temperature values ​​observed by the nearest weather station, meteorological observation station, weather observation station, AMeDAS observation station, etc. to the building 10 from a weather information server, which is an external device 70. The environmental information acquisition means may include an air temperature sensor installed outside the building 10 as the environmental sensor 60.

[0052] In this case, the environmental information acquisition means further acquires room temperature, which is the temperature of the air inside the building 10, as a physical quantity related to the internal environment of the building 10. For example, the environmental information acquisition means includes an air temperature sensor installed inside the building 10, particularly in the second space 12, as the environmental sensor 60. In this case, the control unit 112 may increase the airflow rate of the blower 30, for example, as the difference between the outside air temperature and the room temperature increases.

[0053] A fifth example of the airflow rate change condition is when two or more of the first to sixth examples of the start conditions for the operation of the blower device 30 are simultaneously satisfied. For example, when the first example of the start condition is satisfied and the blower device 30 is operating, if one or more of the second to sixth examples are also satisfied, the control unit 112 increases the airflow rate of the blower device 30. If the second door 15 is opened when the pollutant concentration in the outside air is equal to or higher than the first reference pollutant concentration, the opening area of ​​the second door 15 increases, which may allow more outside air to flow in. In such a case, by increasing the airflow rate of the blower device 30, the inflow of outside air can be suppressed even when the second door 15 is open.

[0054] It should be noted that a combination of two or more of the first to third examples of the airflow rate change condition described above may be used. In particular, it is desirable to make the first example of the airflow rate change condition essential. For example, when the first and second examples are combined as the airflow rate change condition, the airflow rate change condition is satisfied when at least one of the following conditions is met: a change in the concentration of pollutants in the outside air, and a change in the wind direction around the building 10. The same applies when the first example is combined with the third or fourth example.

[0055] In the air blowing system according to this embodiment, the air blower 30 may be configured to stop operating during a stop time period input by the user during the day. In this case, the user can input the stop time period by operating an input device such as the remote control or mobile terminal described above. The control device 100 is also provided with a schedule setting unit (not shown). The schedule setting unit of the control device 100 sets a schedule for stopping the air blower 30 during the stop time period input by the user. The control unit 112 of the control device 100 controls the start and stop of the operation of the air blower 30 according to the schedule set by the schedule setting unit. Even if the start conditions described above are met, the control unit 112 of the control device 100 stops the operation of the air blower 30 if the current time falls within the stop time period during the day. This allows the air blower 30 to automatically operate according to a schedule desired by the user.

[0056] The user may input the operation time period by operating an input means such as the remote control or mobile terminal. In this case, the schedule setting unit of the control device 100 sets a schedule for the operation of the fan device 30 during the operation time period input by the user. Then, the control unit 112 of the control device 100 controls the start and stop of the operation of the fan device 30 according to the schedule set by the schedule setting unit.

[0057] In this case, for example, the user sets the time period when the user is at home in building 10 as the operating time period, and sets the time period when the user leaves building 10 as the stop time period. By doing this, for example, if someone other than the user visits building 10 while the user is out, it is expected that second door 15 will not be opened because the user is not there, even if the intercom is operated or there is a knock on second door 15. By setting the time period when the user is scheduled to leave as the stop time period, unnecessary operation of blower device 30 in such cases can be suppressed, and an increase in power consumption can be prevented.

[0058] The air blowing system according to this embodiment may further include an opening / closing means for opening and closing the second door 15, which is the aforementioned opening / closing body. The control unit 112 of the control device 100 may then control the opening and closing of the opening / closing body by the opening / closing means. In this case, for example, when the pollutant concentration in the outside air becomes equal to or higher than a preset third standard pollutant concentration, the control unit 112 of the control device 100 closes the second door 15, which is the opening / closing body, by the opening / closing means. Closing the second door 15 reduces the opening area, thereby suppressing the inflow of outside air. It is preferable that the third standard pollutant concentration be smaller than the first standard pollutant concentration. This is because if the second door 15 is closed before the air blowing device 30 starts operating, the pressure in the second space 12 is more likely to increase when the air blowing device 30 starts operating.

[0059] In addition, in the air blowing system according to this embodiment, an air curtain (not shown) may be installed at the opening where the second door 15, which is an opening / closing body, is provided. The air curtain is installed on the indoor side of the opening where the opening / closing body is provided. The control unit 112 of the control device 100 may control the operation of the air curtain. In this case, for example, the control unit 112 of the control device 100 activates the air curtain when the pollutant concentration of the outside air becomes equal to or higher than a predetermined fourth standard pollutant concentration. Activating the air curtain can suppress the inflow of outside air through the opening. Here, the fourth standard pollutant concentration is preferably lower than the first standard pollutant concentration, similar to the third standard pollutant concentration described above. This is because if the air curtain is activated before the operation of the air blowing device 30, the pressure in the second space 12 is likely to increase when the air blowing device 30 starts operating.

[0060] The blower 30 may include a filter (not shown). The filter captures and removes contaminants contained in the air passing through the blower 30. Similar to the filter of the air supply device 51, this filter may be, for example, a HEPA filter, an ULPA filter, or an electrostatic filter. The filter of the blower 30 is preferably capable of capturing not only contaminants contained primarily in the outside air but also dust particles and house dust generated primarily within the building 10. The filter of the blower 30 can purify the air blown from the first space 11 to the second space 12. Furthermore, the operation of the blower 30 can circulate and purify the air within the building 10. The filter may be provided in the duct 20, the inlet 21, or the outlet 22, instead of the blower 30.

[0061] The air supply system according to this embodiment can also be applied to buildings 10 other than the building 10 having the structure shown in Figures 1 and 2. With reference to Figures 5 to 9, an example of application of the air supply system to a building 10 having a structure different from that of the building 10 shown in Figures 1 and 2 will be described. As shown in Figures 5 to 7, in this example, a first space 11, a second space 12, and a third space 13 are formed as the interior spaces of a room. The first space 11 is, for example, the interior space of a living room. The third space 13 is, for example, the interior space of a non-living room. In particular, here, the third space 13 is the interior space of a toilet. Also, here, the second space 12 is the interior space of a corridor and entrance hall.

[0062] A first door 14 is provided between the first space 11 and the second space 12. A second door 15 that leads to the outdoors is provided in the second space 12. A third door 16 is provided between the second space 12 and the third space 13.

[0063] As shown in Figures 5 and 6, a duct 20 is provided above the ceiling of the first space 11 and the second space 12. One end of the duct 20 is connected to an intake port 21 formed in the ceiling of the first space 11. The other end of the duct 20 is connected to an outlet port 22 formed in the ceiling of the second space 12. An air passage that connects the first space 11 and the second space 12 is formed inside the duct 20. A blower 30 is provided in the middle of the duct 20. The blower 30 has a built-in fan.

[0064] When the blower 30 operates, that is, when the fan of the blower 30 operates, an airflow is generated in the air passage in the duct 20, flowing from the first space 11 to the second space 12. When the blower 30 operates, air in the first space 11 is drawn into the duct 20 through the intake port 21. The air drawn into the duct 20 flows toward the second space 12 and is blown out into the second space 12 through the outlet port 22. In this way, the blower 30 blows the air in the first space 11 into the second space 12.

[0065] The air passage connecting the first space 11 and the second space 12 is not limited to the duct 20 installed above the ceiling. Alternatively, for example, if the first space 11 and the second space 12 are adjacent to each other, an air passage connecting the first space 11 and the second space 12 may be formed by a duct or the like provided through a wall separating the first space 11 and the second space 12.

[0066] 5 to 7, an air supply device 51 is provided on the outer wall of the first space 11. The air supply device 51 is an air supply port that allows outside air to flow into the first space 11. The air supply device 51 may include an air supply fan for drawing the outside air into the first space 11.

[0067] 5 and 7, an exhaust device 52 is provided on the outer wall of the third space 13. The exhaust device 52 is an exhaust fan that exhausts air from the third space 13 to the outdoors. The exhaust air volume of the exhaust device 52 may be fixed or variable.

[0068] FIG. 8 is a diagram showing the air flow when the blower 30 is stopped. In FIG. 8, the air flow when the blower 30 is stopped is indicated by dashed lines and arrows. As shown in FIG. 8, outside air first flows into the first space 11 through the air supply device 51. The air in the first space 11 flows into the second space 12 through gaps or vents in the first door 14. The air that has flowed into the second space 12 then flows into the third space 13 through gaps or vents in the second door 15 and is exhausted to the outdoors through the exhaust device 52.

[0069] When the blower 30 is stopped, the pressure in the first space 11, into which outside air flows in through the air supply device 51, becomes approximately equal to atmospheric pressure. The pressure in the second space 12 becomes lower than atmospheric pressure. Therefore, outside air flows into the second space 12 through the gap in the second door 15, a vent, or the like. If the concentration of pollutants in the outside air increases in this state, the concentration of pollutants in the second space 12 will also increase, which may reduce user comfort.

[0070] 9 is a diagram showing the air flow when the blower 30 is operating. The air supply device 51 is provided in the first space 11, and when the blower 30 blows air from the first space 11 to the second space 12, the pressure in the second space 12 becomes higher than before the start of the blowing. This makes it possible to prevent outside air from flowing into the second space 12 through gaps in the second door 15 or through vents, etc., and to prevent an increase in the concentration of pollutants in the second space 12.

[0071] In the air blowing system according to the present disclosure, the exhaust device 52 may be provided not only in the third space 13 but also in one or both of the first space 11 and the second space 12. In this case, the air blowing volume of the air blowing device 30 should be greater than the total exhaust air volume of the exhaust devices 52. In this way, the air blowing device 30 can sufficiently blow air from the first space 11 to the second space 12, maintaining a positive pressure in the second space 12 and suppressing the inflow of pollutants from the outdoors into the second space 12.

[0072] In the above description, the "outdoors" of the building 10 may refer not only to the outside of the building 10 but also to non-air-conditioned spaces such as a parking lot within the building 10. In this case, the "outdoor air" may refer not only to the air outside the building 10 but also to the air in the non-air-conditioned spaces.

[0073] 10 is a diagram showing an example of a configuration for realizing the functions of a control device 100 in the present disclosure. The functions of the control device 100 are realized by, for example, a processing circuit. The processing circuit may include a processor 101 and a memory 102. The processing circuit may be dedicated hardware 103. A part of the processing circuit may be formed as dedicated hardware 103, and the processing circuit may further include a processor 101 and a memory 102. In the example shown in the figure, a part of the processing circuit is formed as dedicated hardware 103. Furthermore, in the example shown in the figure, the processing circuit further includes a processor 101 and a memory 102.

[0074] The processing circuitry, part of which is at least one dedicated hardware 103, may be, for example, a single circuit, a multiple circuit, a programmed processor, a parallel programmed processor, an ASIC, an FPGA, or a combination thereof. If the processing circuitry comprises at least one processor 101 and at least one memory 102, the functionality of the control device 100 may be realized by software, firmware, or a combination of software and firmware.

[0075] The software and firmware are written as programs and stored in memory 102. Processor 101 realizes the functions of each unit by reading and executing the programs stored in memory 102. Processor 101 is also called a CPU (Central Processing Unit), central processing unit, processing unit, arithmetic unit, microprocessor, microcomputer, or DSP. Memory 102 may include, for example, non-volatile or volatile semiconductor memory such as RAM, ROM, flash memory, EPROM, and EEPROM, or a magnetic disk, flexible disk, optical disk, compact disk, minidisk, DVD, etc.

[0076] In this way, the processing circuit of the control device 100 can realize each function of the control device 100 by hardware, software, firmware, or a combination of these. When the processing circuit of the control device 100 includes at least the processor 101 and the memory 102, the processor 101 executes a program stored in the memory 102 in the control device 100, and the hardware and software of the control device 100 work together to realize the functions of each unit of the control device 100. Note that the air blowing system is not limited to a configuration in which the operation is controlled by a single control device 100. The operation of the air blowing system may be controlled by multiple devices working together. Furthermore, the control device 100 may be built into the air blowing device 30 or the air conditioning device 40.

[0077] In the present disclosure, the embodiments, configuration examples, modifications, etc. may be combined in any manner without departing from the spirit of the present disclosure. Examples of various aspects of the present disclosure are summarized below as appendices. (Appendix 1) A ventilation system installed in a building in which a first space and a second space are formed, The second space is provided with at least one opening / closing member selected from a door and a window that can open and close an opening that communicates the second space with the outdoors, an air supply device that introduces outside air into the first space; a blower provided in an air passage that communicates the first space and the second space; environmental information acquisition means, the blower starts blowing the air from the first space to the second space when a preset start condition is met while the blower is stopped, the environmental information acquisition means acquires information about the concentration of pollutants in the outside air; The ventilation system, wherein the start condition is that the concentration of pollutants in the outside air is equal to or greater than a predetermined first reference pollutant concentration. (Appendix 2) the blower stops blowing the air from the first space to the second space when a preset stop condition is met during operation of the blower; The ventilation system described in Appendix 1, wherein the stop condition is that the concentration of pollutants in the outside air remains below a predetermined second standard pollutant concentration for a predetermined first standard time or longer. (Appendix 3) the air blower changes the air blowing amount of the air blower when a preset air blowing amount change condition is met during operation of the air blower; 3. The ventilation system according to claim 1, wherein the condition for changing the airflow rate is a change in the concentration of pollutants in the outside air. (Appendix 4) The environmental information acquisition means further acquires a wind direction around the building, The ventilation system described in Appendix 3, wherein the condition for changing the airflow volume is satisfied when at least one of the following conditions is met: the concentration of pollutants in the outside air has changed; and the wind direction around the building has changed. (Appendix 5) The environmental information acquisition means further acquires wind speed around the building, The ventilation system described in Appendix 3, wherein the condition for changing the airflow volume is satisfied when at least one of the following conditions is met: a change in the concentration of pollutants in the outside air; and a change in the wind speed around the building. (Appendix 6) The environmental information acquisition means an outside air temperature, which is the temperature of the outside air; and further acquiring a room temperature, which is the temperature inside the building; The ventilation system described in Appendix 3, wherein the condition for changing the airflow volume is satisfied when at least one of the following conditions is met: the concentration of pollutants in the outside air has changed; and the difference between the outside air temperature and the room temperature has changed. (Appendix 7) 7. The ventilation system according to any one of claims 1 to 6, wherein the air supply device is provided with a filter that captures pollutants in the outside air. (Appendix 8) 8. The ventilation system according to any one of claims 1 to 7, wherein the ventilation device is provided with a filter that captures the pollutants. (Appendix 9) further comprising an exhaust device that exhausts air from one or both of the first space and the second space to the outdoors; 9. The ventilation system according to claim 1, wherein the volume of air blown by the ventilation device is greater than the total volume of exhaust air from the exhaust devices. (Appendix 10) Further comprising a location information acquisition means for acquiring information about the current location of the user, An air supply system as described in any one of Appendix 1 to Appendix 9, wherein the start condition is satisfied when at least one of the following conditions is met: the pollutant concentration of the outside air is equal to or greater than the first standard pollutant concentration; and the distance from the user's current location to the building is equal to or less than a predetermined first standard distance. (Appendix 11) Further provided is a person detection means for detecting the presence or absence of a person in the second space, An air supply system as described in any one of Appendix 1 to Appendix 9, wherein the start condition is satisfied when at least one of the following conditions is met: the pollutant concentration in the outside air is equal to or greater than the first standard pollutant concentration; and a person is present in the second space. (Appendix 12) The building may further include an intercom operation detection means for detecting that an intercom installed in the building has been operated, A ventilation system described in any one of Appendix 1 to Appendix 9, wherein the start condition is satisfied when at least one of the following conditions is met: the pollutant concentration of the outside air is equal to or greater than the first standard pollutant concentration; and the intercom is operated. (Appendix 13) Further provided is a knock detection means for detecting a knock on the opening / closing body, A ventilation system described in any one of Appendix 1 to Appendix 9, wherein the start condition is satisfied when at least one of the following conditions is met: the pollutant concentration of the outside air is equal to or greater than the first standard pollutant concentration; and the opening / closing body is knocked. (Appendix 14) an electric lock that locks and unlocks the opening and closing body; and a lock / unlock detection means for detecting the locked / unlocked state of the electric lock. A ventilation system described in any one of Appendix 1 to Appendix 9, wherein the start condition is satisfied when at least one of the following conditions is met: the pollutant concentration of the outside air is equal to or greater than the first standard pollutant concentration; and the electric lock is unlocked. (Appendix 15) further comprising an input means for a user to input a stop instruction; 15. The air blowing system according to claim 1, wherein the air blowing device stops operating when the stop instruction is input. (Appendix 16) further comprising an input means for a user to input a stop time period; 16. The ventilation system according to any one of claims 1 to 15, wherein the ventilation device stops operating during the input stop time period of one day. (Appendix 17) Further provided is an opening / closing means for opening and closing the opening / closing body, The ventilation system according to any one of claims 1 to 16, wherein the opening / closing means closes the opening / closing body when the pollutant concentration in the outside air is equal to or higher than a predetermined third standard pollutant concentration. (Appendix 18) Further, an air curtain is provided at the opening, 18. The ventilation system according to any one of claims 1 to 17, wherein the air curtain operates when the pollutant concentration in the outside air is equal to or higher than a preset fourth standard pollutant concentration. [Explanation of symbols]

[0078] 10 Building 11 1st space 12 Second space 13 Third space 14 Door 1 15 Door 2 16 Door 3 20 Duct 21 Intake port 22 Air outlet 30 Blower 51 Air supply device 52 Exhaust system 60 Environmental Sensors 70 External equipment 100 control device 101 processors 102 memory 103 Dedicated Hardware 111 Information Acquisition Department 112 Control section 200 communication lines

Claims

1. A ventilation system provided in a building in which a first space and a second space are formed, The second space is provided with at least one opening / closing member selected from a door and a window that can open and close an opening that communicates the second space with the outdoors, an air supply device that introduces outside air into the first space; a blower provided in an air passage that communicates the first space and the second space; environmental information acquisition means, the blower starts blowing the air from the first space to the second space when a preset start condition is met while the blower is stopped, the environmental information acquisition means acquires information about the concentration of pollutants in the outside air; The start condition is that the concentration of pollutants in the outside air is equal to or greater than a predetermined first reference pollutant concentration.

2. the blower device stops blowing the air from the first space to the second space when a preset stop condition is met during operation of the blower device; The ventilation system according to claim 1 , wherein the stop condition is that the concentration of pollutants in the outside air remains below a predetermined second standard pollutant concentration for a predetermined first standard time or longer.

3. the air blower changes the air blowing amount of the air blower when a preset air blowing amount change condition is met during operation of the air blower; The ventilation system according to claim 1 or 2, wherein the condition for changing the airflow rate is a change in the concentration of pollutants in the outside air.

4. The environmental information acquisition means further acquires a wind direction around the building, The ventilation system according to claim 3 , wherein the condition for changing the airflow rate is satisfied when at least one of a concentration of pollutants in the outside air has changed and a wind direction around the building has changed.

5. The environmental information acquisition means further acquires wind speed around the building, The ventilation system according to claim 3 , wherein the condition for changing the airflow rate is satisfied when at least one of a change in the concentration of pollutants in the outside air and a change in the wind speed around the building is satisfied.

6. The environmental information acquisition means an outside air temperature, which is the temperature of the outside air; and further acquiring a room temperature, which is the temperature inside the building; The ventilation system according to claim 3 , wherein the condition for changing the airflow rate is satisfied when at least one of the concentration of pollutants in the outside air has changed and the difference between the outside air temperature and the room temperature has changed.

7. The ventilation system according to claim 1 or 2, wherein the air supply device includes a filter that collects pollutants in the outside air.

8. The air blowing system according to claim 1 or 2, wherein the air blowing device includes a filter that collects the contaminants.

9. further comprising an exhaust device that exhausts air from one or both of the first space and the second space to the outdoors; 3. The ventilation system according to claim 1, wherein the blowing volume of the ventilation device is greater than the total exhaust volume of the exhaust devices.

10. Further comprising a location information acquisition means for acquiring information about the current location of the user, The ventilation system described in claim 1 or claim 2, wherein the start condition is that at least one of the following is satisfied: the pollutant concentration of the outside air is equal to or greater than the first standard pollutant concentration; and the distance from the user's current location to the building is equal to or less than a predetermined first standard distance.

11. Further provided is a person detection means for detecting the presence or absence of a person in the second space, The ventilation system described in claim 1 or claim 2, wherein the start condition is satisfied when at least one of the following conditions is met: the pollutant concentration of the outside air is equal to or greater than the first standard pollutant concentration; and a person is present in the second space.

12. The building may further include an intercom operation detection means for detecting that an intercom installed in the building has been operated, The ventilation system described in claim 1 or claim 2, wherein the start condition is satisfied when at least one of the following conditions is met: the pollutant concentration of the outside air is equal to or greater than the first standard pollutant concentration; and the intercom is operated.

13. Further provided is a knock detection means for detecting a knock on the opening / closing body, The ventilation system according to claim 1 or claim 2, wherein the start condition is satisfied when at least one of the following conditions is met: the pollutant concentration of the outside air is equal to or greater than the first standard pollutant concentration; and the opening / closing body is knocked.

14. an electric lock that locks and unlocks the opening and closing body; and a lock / unlock detection means for detecting the locked / unlocked state of the electric lock. The ventilation system described in claim 1 or claim 2, wherein the start condition is satisfied when at least one of the following conditions is met: the pollutant concentration of the outside air is equal to or greater than the first standard pollutant concentration; and the electric lock is unlocked.

15. further comprising an input means for a user to input a stop instruction; The air blowing system according to claim 1 or 2, wherein the air blowing device stops operating when the stop instruction is input.

16. further comprising an input means for a user to input a stop time period; The air blowing system according to claim 1 or 2, wherein the air blowing device stops operating during the input stop time period within a day.

17. Further provided is an opening / closing means for opening and closing the opening / closing body, 3. The ventilation system according to claim 1, wherein the opening / closing means closes the opening / closing body when the pollutant concentration in the outside air is equal to or higher than a preset third reference pollutant concentration.

18. Further, an air curtain is provided at the opening, 3. The ventilation system according to claim 1, wherein the air curtain operates when the pollutant concentration in the outside air is equal to or higher than a fourth reference pollutant concentration set in advance.

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