JP7270592B2 - Underfloor ventilation system - Google Patents

Description

The present disclosure relates to underfloor ventilation systems.

2. Description of the Related Art Conventionally, an underfloor ventilation system that uses a ventilation device to ventilate an underfloor of a building such as a house is known. For example, Patent Literature 1 describes an underfloor ventilation system that includes an air supply ventilator on the south side of the underfloor and an exhaust ventilator on the north side. Underfloor ventilation systems generally perform underfloor ventilation by taking air from the south side of the building into the underfloor and exhausting it to the north side. Underfloor ventilation discharges underfloor moisture, suppresses the growth of mold and termites and the deterioration of building materials in a building, and improves comfort for users.

JP 2011-237071 A (paragraph 0012, FIG. 1)

Underfloor ventilation systems are usually used in outdoor environments, so compared to ventilation fans installed indoors, the underfloor ventilation openings that serve as air supply or exhaust ports are more likely to be clogged with sand, fallen leaves, etc. Cheap. Furthermore, in the underfloor ventilation system, air is blown in a single direction from the south side to the north side, so dust tends to accumulate in the ventilation openings on the windward side. For this reason, in order to maintain sufficient ventilation performance in the underfloor ventilation system, it was necessary for the user to periodically clean the ventilation openings.

The present disclosure has been made to solve the above-described problems, and provides an underfloor ventilation system capable of suppressing the occurrence of clogging of ventilation openings and reducing the frequency of cleaning by the user.

The underfloor ventilation system according to the present disclosure includes a plurality of ventilation openings provided in a foundation wall forming an underfloor space of a building and communicating between the underfloor space and the outdoors. A ventilator installed on at least one of the north side ventilation port located on the north side to ventilate the underfloor space, a forward operation that draws air into the underfloor space from the south side ventilation port and exhausts it from the north side ventilation port, and north side ventilation A control unit that causes the ventilator to operate in the reverse direction by sucking air into the underfloor space from the mouth and discharging it from the south side ventilation port, south side humidity detection means for detecting the humidity on the south side of the building, and humidity on the north side of the building. and a north side humidity detection means for detecting . When the humidity detected by the south side humidity detection means is lower than the humidity detected by the north side humidity detection means, the control section causes the ventilation device to operate in the forward direction, and the humidity detected by the south side humidity detection means is lower than the humidity detected by the north side humidity detection means. When the humidity is higher than the humidity detected by the north side humidity detection means, the ventilation system is caused to operate in the reverse direction.

According to the present disclosure, it is possible to suppress the occurrence of clogging of the ventilation opening, and reduce the frequency of cleaning by the user.

1 is a schematic diagram of an underfloor ventilation system showing Embodiment 1. FIG. 2 is a block diagram showing the control configuration of the underfloor ventilation system showing Embodiment 1. FIG. 3 is a diagram showing an example of a hardware configuration of a processing circuit of a control unit of the underfloor ventilation system showing Embodiment 1. FIG. 4 is a flow chart of a control procedure of the underfloor ventilation system showing Embodiment 1. FIG. FIG. 4 is a schematic diagram of a modification of the underfloor ventilation system showing Embodiment 1; 9 is a flow chart of a control procedure of the underfloor ventilation system showing Embodiment 2. FIG. FIG. 11 is a schematic diagram of an underfloor ventilation system showing Embodiment 3. FIG. 11 is a flow chart of a control procedure of an underfloor ventilation system showing Embodiment 3. FIG.

Embodiments will be described below with reference to the accompanying drawings. The same reference numerals are given to the same or corresponding parts in each figure.

Embodiment 1.
FIG. 1 is a schematic diagram of an underfloor ventilation system 1 according to Embodiment 1, and is a view of a building 10 such as a house in which the underfloor ventilation system 1 is installed, viewed from the east side. The arrows in FIG. 1 indicate the direction of air flow.

As shown in FIG. 1 , the underfloor ventilation system 1 includes a ventilator 30 that ventilates an underfloor space 12 of a building 10 and a controller 40 that controls the operation of the ventilator 30 . Further, in the present embodiment, the underfloor ventilation system 1 further includes a south side humidity detection means 52 and a north side humidity detection means 54 .

The building 10 has a foundation wall 14 forming an underfloor space 12 . A floor surface 16 is provided above the underfloor space 12 . Further, the foundation wall 14 is provided with a plurality of ventilation openings 20 that communicate the underfloor space 12 with the outdoors. In this embodiment, as the ventilation openings 20, a south ventilation opening 22 and a north ventilation opening 24 are provided. The south ventilation port 22 is arranged on the south side of the building 10 . The north side ventilation opening 24 is arranged on the north side of the building 10 . Here, the south side and north side of the building 10 do not indicate exact directions, and the south side includes the southeast side and the southwest side, and the north side includes the northeast side and the northwest side. A south side filter 26 is provided at the outdoor opening of the south side ventilation port 22 . A north filter 28 is provided at the outdoor opening of the north ventilation port 24 .

The ventilator 30 is provided in at least one of the south ventilation port 22 and the north ventilation port 24 . The ventilator 30 is capable of forward and reverse operation. In forward operation, the ventilator 30 draws air into the underfloor space 12 through the south vent 22 and exhausts it through the north vent 24 . In the example shown in FIG. 1, air flows in the direction indicated by the white arrow during forward operation. In reverse operation, the ventilator 30 draws air into the underfloor space 12 through the north vent 24 and exhausts it through the south vent 22 . In the example shown in FIG. 1, air flows in the direction indicated by the black arrow during reverse operation. The ventilation device 30 has, for example, a housing, a motor, and a fan rotated by the motor, and the motor and the fan are housed in the housing. The ventilation device 30 can send air in the first blowing direction by rotating the fan in the first rotating direction with the motor. In addition, the ventilation device 30 rotates the fan in a second rotation direction opposite to the first rotation direction by means of the motor, thereby sending air in a second blowing direction opposite to the first blowing direction. can be done. With such a configuration, for example, the ventilation device 30 performs forward operation by rotating the fan in the first rotation direction, and performs reverse operation by rotating the fan in the second rotation direction. .

In this embodiment, two ventilators 30 are provided: a south ventilator 32 and a north ventilator 34 . The south ventilation device 32 is provided at the south ventilation port 22 . The north ventilation device 34 is provided at the north ventilation port 24 .

The south side humidity detection means 52 detects the humidity on the south side of the building 10 . The north side humidity detection means 54 detects the humidity on the north side of the building 10 . The south side humidity detection means 52 and the north side humidity detection means 54 are, for example, humidity sensors that detect humidity. In the example shown in FIG. 1, the south side humidity detection means 52 is arranged on the outdoor side of the south side ventilation opening 22 and detects the outdoor humidity on the south side of the building 10 . Further, the north side humidity detection means 54 is arranged on the outdoor side of the north side ventilation opening 24 and detects the outdoor humidity on the north side of the building 10 .

The control unit 40 causes the ventilator 30 to operate in the forward direction and in the reverse direction. In this embodiment, the controller 40 is provided in a controller 42 for operating the underfloor ventilation system 1 . FIG. 2 is a block diagram showing the control configuration of the underfloor ventilation system 1. As shown in FIG. The control unit 40 is electrically connected to each of the south ventilation device 32, the north ventilation device 34, the south humidity detection means 52, and the north humidity detection means 54 by signal lines. The control unit 40 outputs an operation command to each of the south side ventilation device 32 and the north side ventilation device 34 via a signal line, and controls each operation. The control unit 40 also acquires information indicating the humidity detected by each of the south humidity detection means 52 and the north humidity detection means 54 via the signal line.

The functions of the control unit 40 are realized, for example, as a processing circuit having the hardware configuration shown in FIG. FIG. 3 is a diagram illustrating an example of a hardware configuration of a processing circuit; The functions of the control unit 40 are realized, for example, by the processor 44 shown in FIG. 3 executing a program stored in the memory 46 . Also, multiple processors and multiple memories may work together to achieve the above functions. Also, part of the functions of the control unit 40 may be implemented as an electronic circuit, and other parts may be realized using the processor 44 and the memory 46 .

Next, operation control of the ventilator 30 in the underfloor ventilation system 1 will be described with reference to FIG. FIG. 4 is a flow chart of the control procedure of the underfloor ventilation system 1. As shown in FIG.

In the underfloor ventilation system 1, control is started when power is turned on. First, the control unit 40 determines whether or not the current time is included in the operating time period during which the ventilation device 30 is operated (step ST1). The operating hours are set in advance by the builder using the controller 42, for example. Normally, the underfloor ventilation system 1 is operated outdoors during the day when the humidity is low to ventilate the underfloor space 12 . Therefore, as the operating time zone, for example, the time zone from 10:00 am to 4:00 pm in a day when the humidity tends to be low is set. If the current time is included in the operating time zone (step ST1, YES), the process proceeds to step ST2. If the current time is not included in the operating time zone (step ST1, NO), the ventilator 30, that is, the south ventilator 32 and the north ventilator 34 are stopped (step ST8).

In step ST2, the control unit 40 determines whether or not the south side humidity, which is the humidity detected by the south side humidity detection means 52, is equal to or less than a preset humidity threshold (hereinafter referred to as "humidity threshold"). judge. The humidity threshold is set so as not to ventilate the underfloor space 12 when the outside is in a high-humidity environment such as in rainy weather. The humidity threshold is set at 80%, for example. The setting of the humidity threshold is performed by the installer using the controller 42, for example, in the same manner as the setting of the operating hours. If the south side humidity is less than or equal to the humidity threshold (step ST2, YES), the process proceeds to step ST3. If the south side humidity is not equal to or lower than the humidity threshold, that is, if the south side humidity is higher than the humidity threshold (step ST2, NO), the process proceeds to step ST4.

In step ST3, the control section 40 determines whether the north side humidity, which is the humidity detected by the north side humidity detection means 54, is equal to or less than the humidity threshold. If the north side humidity is equal to or lower than the humidity threshold (step ST3, YES), the process proceeds to step ST5. If the north side humidity is not below the humidity threshold, that is, if the north side humidity is higher than the humidity threshold (step ST3, NO), the process proceeds to step ST6.

In step ST5, the control section 40 determines whether or not the humidity on the south side is lower than the humidity on the north side. If the humidity on the south side is lower than the humidity on the north side (step ST5, YES), the process proceeds to step ST6. In this case, both the humidity on the south side and the humidity on the north side are equal to or less than the humidity threshold, and the humidity on the south side is lower than the humidity on the north side. Therefore, in step ST6, the control unit 40 causes the ventilators 30, that is, the south ventilator 32 and the north ventilator 34, to operate in the normal direction. Further, if the north side humidity is not equal to or lower than the humidity threshold in step ST3 (step ST3, NO), the south side humidity is equal to or lower than the humidity threshold and the north side humidity is higher than the humidity threshold, so the south side humidity is lower than the north side humidity. . In this case as well, it is preferable to supply air to the underfloor space 12 through the south side ventilation port 22 and exhaust air through the north side ventilation port 24. Therefore, in step ST6, the control unit 40 causes the ventilation device 30 to operate in the normal direction.

Moreover, when the south side humidity is not lower than the north side humidity, that is, when the south side humidity is equal to or higher than the north side humidity (step ST5, NO), the process proceeds to step ST7. In this case, both the humidity on the south side and the humidity on the north side are equal to or lower than the humidity threshold, and the humidity on the south side is equal to or higher than the humidity on the north side. Therefore, in step ST7, the control unit 40 causes the ventilators 30, that is, the south ventilator 32 and the north ventilator 34, to operate in the opposite direction.

In step ST4, the controller 40 determines whether the north side humidity is equal to or less than the humidity threshold. When the north side humidity is equal to or less than the humidity threshold (step ST4, YES), the process proceeds to step ST7. In this case, the south side humidity is higher than the humidity threshold, and the north side humidity is less than or equal to the humidity threshold, so the south side humidity is higher than the north side humidity. Therefore, in this case as well, it is preferable to supply air to the underfloor space 12 from the north side ventilation port 24 and exhaust air from the south side ventilation port 22. Therefore, in step ST7, the control unit 40 causes the ventilation device 30 to operate in the reverse direction. .

If the north side humidity is not equal to or lower than the humidity threshold, that is, if the north side humidity is higher than the humidity threshold (step ST4, NO), the process proceeds to step ST8. In this case, since the humidity on the south side and the humidity on the north side are both higher than the humidity threshold, in step ST8, the control unit 40 stops both the ventilation device 30, that is, the ventilation device 32 on the south side and the ventilation device 34 on the north side, and the underfloor space. Do not ventilate 12.

The control unit 40 causes the ventilator 30 to operate in the forward direction (step ST6), the state in which the ventilator 30 operates in the reverse direction (step ST7), and the state in which the ventilator 30 is stopped (step After either of ST8) is continued for a certain period of time, the process returns to step ST1 and the determination is made again. For example, after causing the ventilator 30 to operate in the forward direction for one hour in step ST6, the control unit 40 returns to step ST1 and makes the determination in step ST1 again.

In step ST5, if the south side humidity and the north side humidity are the same value, the process proceeds to step ST7, and the ventilator 30 operates in the reverse direction. You may make it carry out directional driving.

As described above, the underfloor ventilation system 1 according to the present embodiment has a plurality of ventilation openings 20 that communicate the underfloor space 12 provided in the foundation wall 14 forming the underfloor space 12 of the building 10 with the outdoors. Among them, a ventilation device 30 provided in at least one of a south ventilation port 22 arranged on the south side of the building 10 and a north ventilation port 24 arranged on the north side of the building 10 to ventilate the underfloor space 12, and a south ventilation port. 22 into the underfloor space 12 and discharges it from the north side ventilation port 24, and the reverse direction operation that sucks air into the underfloor space 12 from the north side ventilation port 24 and discharges it from the south side ventilation port 22. and a control unit 40 that causes the 30 to perform.

With such a configuration, the ventilation device 30 is operated in the forward direction, sucking air into the underfloor space 12 from the south side ventilation port 22 and discharging it from the north side ventilation port 24, and sucking air into the underfloor space 12 from the north side ventilation port 24, Since the operation is performed in the reverse direction to discharge from the ventilation port 22, the direction of the flow of the first air supplied from the south side ventilation port 22 and exhausted from the north side ventilation port 24 in the forward direction operation, and the flow of the first air. The underfloor space 12 is ventilated by the flow direction of the second air supplied from the north side ventilation port 24 and exhausted from the south side ventilation port 22 by reverse operation, which is opposite to the direction. Conventionally, when ventilation is performed only in a single air flow direction, clogging of the ventilation opening on the windward side and clogging of the filter provided in this ventilation opening tend to occur. On the other hand, in the underfloor ventilation system 1 according to the present embodiment, ventilation is performed by two opposite air flow directions. Even if fallen leaves or the like accumulate, sand or fallen leaves accumulated in the ventilation port 20 can be blown off by ventilation in the other air flow direction. As a result, clogging of the ventilation opening 20 on the windward side and clogging of the filter provided in the ventilation opening 20 can be suppressed. Therefore, it is possible to suppress the deterioration of the ventilation performance of the underfloor ventilation system 1 and reduce the cleaning frequency of the user.

The ventilator 30 also has a south ventilator 32 provided at the south ventilator 22 and a north ventilator 34 provided at the north ventilator 24 . With such a configuration, air supply and exhaust at the south ventilation port 22 can be forced by the south ventilation device 32 and air supply and exhaust at the north ventilation port 24 can be forced by the north ventilation device 34 . Therefore, compared to the case where air is supplied and exhausted naturally through one of the south side ventilation port 22 and the north side ventilation port 24, it is possible to secure the ventilation amount more reliably.

The underfloor ventilation system 1 further includes a south side humidity detection means 52 for detecting the humidity on the south side of the building 10, and a north side humidity detection means 54 for detecting the humidity on the north side of the building 10. The control unit 40 detects the humidity on the south side. When the humidity detected by the means 52 is lower than the humidity detected by the north side humidity detection means 54, the ventilator 30 is caused to operate in the normal direction, and the humidity detected by the south side humidity detection means 52 becomes the north side humidity detection. If the humidity is higher than that sensed by means 54, it causes the ventilator 30 to operate in the reverse direction. With such a configuration, the underfloor space 12 can be ventilated by supplying air to the underfloor space 12 from the lower humidity side compared to the south side and the north side of the building 10, so that the underfloor space 12 can be ventilated more efficiently. In addition, in the conventional underfloor ventilation system, ventilation was performed only under conditions where ventilation from the south side to the north side was possible, but in the underfloor ventilation system 1 in the present embodiment, there are conditions where ventilation from the north side to the south side is possible. Therefore, the underfloor space 12 can be ventilated more frequently, and the underfloor humidity can be improved.

In this embodiment, two ventilators 30, the south ventilator 32 and the north ventilator 34, are provided, but the present invention is not limited to this. One ventilator 30 may be provided like the underfloor ventilation system 1A of the modification shown in FIG. FIG. 5 is a schematic diagram of the underfloor ventilation system 1A. In the example of FIG. 5, as the ventilator 30, a north ventilator 34 is provided at the north ventilator 24. As shown in FIG. In this case, during normal operation, the underfloor space 12 is ventilated by naturally supplying air to the underfloor space 12 from the south side ventilation port 22 and forcibly exhausting air from the north side ventilation port 24 by the north side ventilation device 34. - 特許庁In reverse operation, the underfloor space 12 is ventilated by forcibly supplying air to the underfloor space 12 from the north side ventilation port 24 by the north side ventilation device 34 and performing natural exhaust from the south side ventilation port 22. - 特許庁With such a configuration, the number of ventilators 30 included in the underfloor ventilation system 1A can be reduced, and costs can be suppressed.

Also, although one south ventilation port 22 and one north ventilation port 24 are provided, the present invention is not limited to this, and a plurality of ventilation ports may be provided. For example, the building 10 may be provided with multiple south ventilation openings 22 . In this case, each of the plurality of south ventilation openings 22 may be provided with the south ventilation device 32 and the south humidity detection means 52 . When a plurality of south-side humidity detection means 52 are provided, for example, the average value or maximum value of the humidity detected by each of the plurality of south-side humidity detection means 52 is used as the south-side humidity to be compared with the humidity threshold and the north-side humidity. Alternatively, one of the humidity levels detected by each of the plurality of south-side humidity detection means 52 may be set as the representative value.

The underfloor ventilation system 1 may be provided with a display section 48 that displays the operating state of the ventilation device 30 . In the example of FIG. 1, the display section 48 is provided in the controller 42 . The display unit 48 is composed of, for example, an LED (Light-emitting diode), a liquid crystal display, or the like. For example, when the ventilation device 30 is operating in the reverse direction, the display unit 48 displays that the ventilation device 30 is operating in the reverse direction as the operating state of the ventilation device 30 . With such a configuration, the user can confirm the operating state of the underfloor ventilation system 1, and usability can be improved.

Further, the controller 42 may be provided with an operation button for allowing the user to operate the ventilator 30 in the forward direction or the reverse direction at any timing.

Embodiment 2.
Next, Embodiment 2 will be described with reference to FIG. FIG. 6 is a flow chart of the control procedure of underfloor ventilation system 101 in the present embodiment. In this embodiment, the description of the same parts as in the first embodiment will be omitted.

Underfloor ventilation system 101 has the same configuration as underfloor ventilation system 1 in Embodiment 1 shown in FIG. As shown in FIG. 6, the control procedure for the underfloor ventilation system 101 is obtained by adding control steps after steps ST6 and ST7 to the control procedure for the underfloor ventilation system 1 shown in FIG.

After step ST6, the control unit 40 determines whether or not a preset first time has elapsed since the ventilator 30 started operating in the forward direction (step ST11). If the first time has passed (step ST11, YES), the process proceeds to step ST12. If the first period of time has not elapsed (step ST11, NO), the control unit 40 causes the ventilator 30 to continue forward operation until the first period of time has elapsed.

In step ST12, the control unit 40 causes the ventilator 30 to operate in the reverse direction. The reverse direction operation is performed until a certain period of time shorter than the first period of time elapses. For example, the control unit 40 causes the ventilator 30 to operate in the forward direction for one hour as the first time period, and causes the ventilator 30 to operate in the reverse direction for five minutes in step ST12. After step ST12, the process returns to step ST1, and the determination of step ST1 is performed again.

Further, after step ST7, the control unit 40 determines whether or not a second preset time has elapsed since the ventilation device 30 performed the reverse operation (step ST13). If the second time has passed (step ST13, YES), the process proceeds to step ST14. If the second time has not elapsed (step ST13, NO), the control unit 40 causes the ventilator 30 to continue reverse operation until the second time has elapsed.

At step ST14, the controller 40 causes the ventilator 30 to operate in the forward direction. Forward operation is performed until a fixed time shorter than the second time elapses. For example, the control unit 40 causes the ventilator 30 to operate in the reverse direction for one hour as the second time period, and causes the ventilator 30 to operate in the forward direction for five minutes in step ST14. After step ST14, the process returns to step ST1, and the determination of step ST1 is performed again.

In the underfloor ventilation system 101 according to the present embodiment, the control unit 40 causes the ventilation device 30 to Let the other run run. With such a configuration, when one of the forward direction operation and the reverse direction operation is continuously performed for a certain period of time, it is possible to switch to the other operation and perform the operation. For this reason, for example, even if ventilation with the same air flow direction continues for a long time without much change in the relative humidity between the north side and the south side of the building 10 due to the surrounding environment of the building 10. , the normal direction operation and the reverse direction operation can be periodically switched and implemented, and the air flow direction can also be periodically switched accordingly. As a result, clogging of the ventilation port 20 and clogging of the filter provided in the ventilation port 20 can be suppressed more reliably.

In the present embodiment, when the current time is included in the operating time period (step ST1, YES), the operation is performed to switch between the forward direction operation and the reverse direction operation, but the present invention is not limited to this. When one of the forward direction operation and the reverse direction operation continues to be performed and the current time is no longer in the operating time zone (step ST1, NO), before the ventilator 30 is stopped, the ventilator 30 may be caused to perform the other operation for a certain period of time.

Embodiment 3.
Next, Embodiment 3 will be described with reference to FIGS. 7 and 8. FIG. FIG. 7 is a schematic diagram of the underfloor ventilation system 201 in this embodiment. FIG. 8 is a flow chart of the control procedure of the underfloor ventilation system 201 . Note that descriptions of the same portions of the present embodiment as those of the above-described embodiment will be omitted.

The underfloor ventilation system 201 in the present embodiment controls the operation of the ventilation device 30 based on the pressure loss in the air passage between the south side ventilation port 22 and the north side ventilation port 24. Different from System 1. As shown in FIG. 7, the underfloor ventilation system 201 has the same configuration as the underfloor ventilation system 1 shown in FIG. 1 except that the south side humidity detection means 52 and the north side humidity detection means 54 are not provided. there is

In general, pressure loss varies depending on conditions such as the shape and length of air passages. For example, when the underfloor ventilation system 201 is operated in the forward direction, the south side ventilation device 32 draws in outdoor air, and the north side ventilation device 34 exhausts the air to the outside via the underfloor space 12 . At this time, the magnitude of the pressure loss varies depending on the size of the underfloor space 12, the arrangement of underfloor beams, the states of the south filter 26 and the north filter 28, and the like.

If the pressure loss in the air passage becomes larger than usual while the underfloor ventilation system 201 is operating, it is conceivable that the ventilation port 20 or the filter provided in the ventilation port 20 may be clogged. . Therefore, the underfloor ventilation system 201 controls the operation of the ventilator 30 so that the pressure loss in the air passage does not become excessive. The pressure loss of the air passage can be estimated by, for example, the following method. A DC motor (direct current motor) is used as the motor of the ventilation device 30, and the air volume generated by the fan is proportional to the first power of the rotation speed of the DC motor. Using the characteristics of driving a fan with a DC motor, such as the relationship proportional to the power, the rotation speed and current value of the DC motor during forward or reverse direction operation, and the rotation speed and current value during normal operation The pressure loss can be estimated by setting a current value, etc., or by setting reference rotation speed, current value, etc. in advance before shipping the product and comparing the set rotation speed, current value, etc.

The pressure loss in the air passage, which is the reference for the underfloor ventilation system 201 to operate in the forward direction or in the reverse direction, can be preset in the control unit 40 . For example, when a contractor installs the underfloor ventilation system 201 in the building 10, the pressure loss is obtained from the actual construction situation, and the value of the pressure loss is set in the control unit 40 as a reference value. In addition, using the pressure loss estimation method described above, the ventilator 30 is operated in the forward direction in a state where impurities such as sand and fallen leaves are not adhered to the south ventilation port 22, the north ventilation port 24, the south filter 26, and the north filter 28. The pressure loss in the air passage may be estimated by performing operation or reverse operation, and this estimated value may be set in the control unit 40 as a reference value.

Next, operation control of the ventilator 30 in the underfloor ventilation system 201 will be described with reference to FIG.

First, similarly to the underfloor ventilation system 1 in Embodiment 1, the control unit 40 determines whether or not the current time is included in the operation time zone (step ST1). If the current time is included in the operating time zone (step ST1, YES), the process proceeds to step ST21. If the current time is not included in the operation time zone (step ST1, NO), the ventilator 30 is stopped (step ST8).

In step ST21, the controller 40 causes the ventilator 30 to operate in the forward direction. Subsequently, in step ST22, the control unit 40, for example, using the pressure loss estimation method described above, determines the current value of the pressure loss and the reference when the air flows from the south side ventilation port 22 to the north side ventilation port 24 in forward operation. value, and determines whether the difference between the current value and the reference value is equal to or greater than a preset threshold. If the difference between the current pressure loss value and the reference value is greater than or equal to the threshold value (step ST22, YES), the process proceeds to step ST23. In this case, since the pressure loss has increased by more than the threshold, it is considered that the windward ventilation opening 20, that is, the south ventilation opening 22 and the south filter 26 are clogged. Therefore, in step ST23, the control unit 40 causes the ventilator 30 to operate in the reverse direction. After causing the ventilator 30 to operate in the reverse direction for a certain period of time, the control unit 40 returns to step ST1 and makes the determination in step ST1 again.

If the difference between the current pressure loss value and the reference value is not equal to or greater than the threshold value (step ST22, NO), the process proceeds to step ST24. In this case, clogging of the south side ventilation port 22 and clogging of the south side filter 26 are considered not to have occurred, so in step ST24, the control section 40 continues to cause the ventilator 30 to operate in the forward direction. After allowing the ventilator 30 to operate in the forward direction for a certain period of time, the control unit 40 returns to step ST1 and makes the determination in step ST1 again.

In step ST22, it is determined whether or not the difference between the current pressure loss value and the reference value is greater than or equal to the threshold value. You may make it

In the underfloor ventilation system 201 according to the present embodiment, the control unit 40 selects one of forward operation and reverse operation based on the pressure loss in the air passage between the south side ventilation port 22 and the north side ventilation port 24. Let device 30 perform. With such a configuration, one of the forward direction operation and the reverse direction operation is performed based on the pressure loss in the air passage related to the clogging of the ventilation port 20 or the clogging of the filter provided in the ventilation port 20. To efficiently ventilate an underfloor space 12 while suppressing clogging of a ventilation port 20 and clogging of a filter provided in the ventilation port 20 without switching between normal direction operation and reverse direction operation more than necessary. can be done.

In addition, when the ventilation device 30 is operating in the normal direction, the control unit 40 controls the pressure loss when the air flows from the south side ventilation port 22 to the north side ventilation port 24 when the pressure loss increases to a preset value or more. , causing the ventilator 30 to perform reverse operation. In this way, the clogging of the south side ventilation port 22, which is the windward side ventilation port 20, due to the forward operation, which is usually performed frequently in the underfloor ventilation system 201, can be confirmed when the pressure loss is equal to or greater than a preset value. , it can be suppressed by performing reverse operation and exhausting air from the south side ventilation port 22 .

In the present embodiment, the control unit 40 controls the rotation speed of the ventilation device 30, more specifically, the rotation speed of the DC motor of the ventilation device 30, when causing the ventilation device 30 to operate in the forward direction or the reverse direction. You may make it control a number. For example, in step ST23, the control unit 40 may set the rotational speed of the ventilator 30 based on the pressure loss when causing the ventilator 30 to operate in the reverse direction. By setting the rotational speed of the ventilator 30 based on the pressure loss in this way, it is possible to prevent an increase in power consumption and noise due to an excessive increase in the rotational speed of the ventilator 30 . In addition, when the pressure loss is large, the clogging of the south side ventilation port 22 can be quickly cleared by causing the ventilator 30 to operate in the reverse direction at a rotation speed higher than that in normal reverse direction operation. can.

It should be noted that appropriate combinations, modifications, and omissions of the embodiments are also included within the scope of the technical ideas shown in the embodiments.

1, 1A, 101, 201 underfloor ventilation system, 10 building, 12 underfloor space, 14 foundation wall, 16 floor surface, 20 ventilation opening, 22 south ventilation opening, 24 north ventilation opening, 26 south filter, 28 north filter, 30 ventilation Apparatus 32 South ventilation device 34 North ventilation device 40 Control unit 42 Controller 44 Processor 46 Memory 48 Display unit 52 South humidity detection means 54 North humidity detection means.

Claims (3)

Among a plurality of ventilation openings provided in a foundation wall forming an underfloor space of a building and communicating the underfloor space with the outdoors, the south ventilation opening located on the south side of the building and the north ventilation opening located on the north side of the building. a ventilator provided in at least one of the ventilation port and performing ventilation of the underfloor space;
A forward operation in which air is drawn into the underfloor space from the south ventilation port and discharged from the north ventilation port, and a reverse direction operation in which the air is drawn into the underfloor space from the north ventilation port and discharged from the south ventilation port. a control unit that causes the ventilator to perform
south side humidity detection means for detecting the humidity on the south side of the building;
north side humidity detection means for detecting the humidity on the north side of the building;
with
When the humidity detected by the south side humidity detection means is lower than the humidity detected by the north side humidity detection means, the control section causes the ventilation device to operate in the forward direction, and the south side humidity detection means. is higher than the humidity detected by the north side humidity detection means, the underfloor ventilation system causes the ventilation device to operate in the reverse direction. 2. When the ventilator continuously performs one of the forward operation and the reverse operation for a preset time, the control unit causes the ventilator to perform the other operation. The underfloor ventilation system described in . Among a plurality of ventilation openings provided in a foundation wall forming an underfloor space of a building and communicating the underfloor space with the outdoors, the south ventilation opening located on the south side of the building and the north ventilation opening located on the north side of the building. a ventilator provided in at least one of the ventilation port and performing ventilation of the underfloor space;
A forward operation in which air is drawn into the underfloor space from the south ventilation port and discharged from the north ventilation port, and a reverse direction operation in which the air is drawn into the underfloor space from the north ventilation port and discharged from the south ventilation port. a control unit that causes the ventilator to perform
with
The control unit
causing the ventilator to perform one of the forward direction operation and the reverse direction operation based on the pressure loss in the air passage between the south side ventilation port and the north side ventilation port;
When the pressure loss when the air flows from the south ventilation port to the north ventilation port increases to a preset value or more while the ventilation device is operating in the forward direction, the ventilation device to carry out the reverse operation,
An underfloor ventilation system for setting the rotational speed of the ventilator based on the pressure loss when the ventilator is operated in the reverse direction.

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