Ventilation device

Abstract

To provide a ventilation device which can perform ventilation control that has taken into consideration the case where there is a possibility of fire happening in a predetermined space.SOLUTION: A ventilation device includes: an exhaust fan 4 for performing air exhaustion in a predetermined space; a vibration sensor 5 for measuring the size of the vibration in the predetermined space; a determination unit 23 for determining whether or not there is a possibility of fire happening in the predetermined space, based on the size of the vibration measured by the vibration sensor 5; and an exhaust control unit 24 for controlling the air exhaustion amount of the exhaust fan 4 based on the determination result of the determination unit 23. Thereby, the problem is solved.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a ventilation device.

Background Art

[0002] Conventionally, there is known a ventilation device that is controlled by a ventilation system that controls based on the carbon dioxide concentration in a predetermined indoor space (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Conventional ventilation devices control the ventilation volume based on the carbon dioxide concentration in a predetermined space, but do not consider the case where a large earthquake has occurred in the predetermined space and there is a possibility of a fire.

[0005] Therefore, the present disclosure solves the above-described conventional problems, and an object thereof is to provide a ventilation device capable of performing ventilation control in consideration of the case where there is a possibility of a fire occurring in a predetermined space.

Means for Solving the Problems

[0006] To achieve this object, a ventilation device according to the present disclosure includes an exhaust fan that exhausts a predetermined space, a vibration sensor that measures the magnitude of vibration in the predetermined space, a determination unit that determines whether there is a possibility of a fire occurring in the predetermined space based on the magnitude of vibration measured by the vibration sensor, and an exhaust control unit that controls the exhaust volume of the exhaust fan based on the determination result of the determination unit. Thereby, the intended object is achieved.

Effects of the Invention

[0007] According to the present disclosure, it is possible to provide a ventilation device capable of performing ventilation control in consideration of a case where there may be a fire in a predetermined space.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Modes for Carrying Out the Invention

[0009] Embodiments of the present disclosure will be described with reference to the drawings. However, each of the embodiments shown below is an example for embodying the technical idea of the present disclosure, and the present disclosure is not limited to the following. In particular, numerical values, materials, shapes, relative arrangements, etc. described in each embodiment are not intended to limit the scope of the present disclosure only to those, but are merely examples.

[0010] (Embodiment 1) First, the ventilation device according to the embodiment of the present disclosure will be described. FIG. 1 shows the configuration of the ventilation device according to the embodiment of the present disclosure. The ventilation device is installed, for example, in the ceiling space of a predetermined space such as a single room indoors. An example of the predetermined space is a living room, but it may also be a single room in a facility such as an office building. The ventilation device includes a housing 1.

[0011] The housing 1 is a box-shaped body with a generally rectangular parallelepiped shape, and includes a suction port 2, a blowout port 3, an exhaust fan 4, a vibration sensor 5, a control unit 6, and a duct 7. Here, the internal space of the housing 1 is defined as the inner space of the housing. In the present embodiment, the housing 1 is embedded in the ceiling of a predetermined space. The lower surface of the housing 1 is exposed in the predetermined space.

[0012] The suction port 2 is provided on the lower surface of the housing 1 and is an opening for taking in air from the predetermined space into the inner space of the housing.

[0013] The blowout port 3 is provided on the side surface of the housing 1 and is an opening for blowing out the air in the inner space of the housing to the outside. The blowout port 3 is connected to one end of the duct 7. The other end of the duct 7 not connected to the blowout port 3 is connected to the outside. That is, the inner space of the housing is connected to the outside through the blowout port 3 and the duct 7.

[0014] The exhaust fan 4 is provided in the inner space of the housing and above the suction port 2. As shown in FIG. 1, the exhaust fan 4 is provided at a position facing the suction port 2. The exhaust fan 4 is, for example, a sirocco fan and is composed of a DC (Direct Current) motor, a shaft extending from the DC motor, and blade portions attached to the shaft. In the exhaust fan 4, when the DC motor operates, the blade portions rotate. The exhaust fan 4 sucks in the air in the predetermined space into the inner space of the housing as the blade portions rotate, and discharges the sucked air toward the side surface of the housing 1 in the direction where the blowout port 3 is located. The discharged air is exhausted to the outside through the blowout port 3 and the duct 7. The exhaust fan 4 may be a motor other than a DC motor, such as an AC (Alternating Current) motor. That is, the exhaust fan 4 exhausts air from the predetermined space to the outside. The exhaust fan 4 is controlled by the control unit 6 described later.

[0015] The vibration sensor 5 measures the magnitude of vibration in a predetermined space. For example, an acceleration sensor is used as the vibration sensor 5. In this embodiment, as an example, the vibration sensor 5 is provided inside the housing 1. Note that the vibration sensor 5 may be installed within the predetermined space, such as on the wall of the predetermined space. The magnitude of the vibration measured by the vibration sensor 5 is sent to the control unit 6 by wired communication or wireless communication. Also, a displacement sensor may be used as the vibration sensor 5. That is, physical quantities for measuring the magnitude of vibration by the vibration sensor 5 include acceleration, displacement, etc., but any physical quantity may be used as long as it can measure the magnitude of vibration.

[0016] The control unit 6 controls the ventilation device. Details of the control content will be described later.

[0017] Next, with reference to FIG. 2, each function of the control unit 6 according to Embodiment 1 of the present disclosure will be described. FIG. 2 is a schematic functional block diagram of the control unit 6 and its peripheral parts according to Embodiment 1. The control unit 6 controls the exhaust volume of the exhaust fan 4 based on the magnitude of the vibration measured by the vibration sensor 5.

[0018] The control unit 6 includes a vibration level acquisition unit 21, a storage unit 22, a determination unit 23, and an exhaust control unit 24.

[0019] The vibration level acquisition unit 21 acquires the vibration level, which is the magnitude of the vibration in the predetermined space measured by the vibration sensor 5.

[0020] The storage unit 22 is a so-called memory that stores various threshold values. Specifically, the storage unit 22 stores the threshold value of the vibration level. The threshold value is for determining whether there is a possibility of a fire occurring within the predetermined space when a major earthquake occurs in the predetermined space. The threshold value is, for example, a value determined in advance by experiments or the like and can be set arbitrarily. An example of the threshold value is 100 centimeters per second per second (cm / s 2 )

[0021] The determination unit 23 determines whether there is a possibility of a fire occurring in a predetermined space based on the magnitude of the vibration measured by the vibration sensor 5. In the present embodiment, the determination unit 23 determines whether there is a possibility of a fire occurring in a predetermined space based on the vibration level acquired by the vibration level acquisition unit 21 and the threshold value stored in the storage unit 22. Specifically, if the vibration level is equal to or higher than the threshold value, the determination unit 23 determines that there is a possibility of a fire occurring in the predetermined space.

[0022] The exhaust control unit 24 normally controls the exhaust volume of the exhaust fan 4 in the normal operation mode. The exhaust volume in the normal operation mode is, for example, a predetermined exhaust volume. That is, the exhaust control unit 24 controls the exhaust volume of the exhaust fan 4 so as to be the predetermined exhaust volume. The predetermined exhaust volume is, for example, a value determined in advance by experiments or the like and can be arbitrarily set. The predetermined exhaust volume may be set by the user. Since the constant air volume control for controlling the air volume to the predetermined exhaust volume is a known technique, a detailed description thereof is omitted.

[0023] Note that the exhaust volume in the normal operation mode may be controlled based on the air quality in the predetermined space. An example of the air quality is the carbon dioxide concentration. That is, the exhaust control unit 24 may control the exhaust volume of the exhaust fan 4 based on the carbon dioxide concentration present in the air of the predetermined space in the normal operation mode. For example, the exhaust control unit 24 controls the exhaust volume of the exhaust fan 4 to be larger as the carbon dioxide concentration is higher. The air quality may be temperature, humidity, cleanliness, odor level, etc.

[0024] Furthermore, the exhaust control unit 24 controls the exhaust volume of the exhaust fan 4 based on the determination result of the determination unit 23. In Embodiment 1, when the determination unit 23 determines that there is a possibility of a fire occurring in the predetermined space, the exhaust control unit 24 controls the exhaust volume of the exhaust fan 4 to the maximum exhaust volume that can be set.

[0025] Here, the reason for performing the above exhaust gas volume control will be explained. When a major earthquake occurs within a predetermined space, there is a possibility of a fire occurring within the predetermined space. When a fire occurs within the predetermined space, it is desirable to exhaust as much dust, carbon monoxide, etc. within the predetermined space from the predetermined space as possible, that is, to perform exhaust from as much of the predetermined space as possible. This is because by exhausting, health hazards such as carbon monoxide poisoning of the user can be suppressed. Thus, the above exhaust gas volume control is performed to suppress health hazards to the user.

[0026] Here, each functional block of the control unit 6 can be realized by elements and mechanical devices including the CPU (Central Processing Unit) of a computer in terms of hardware, and can be realized by a computer program or the like in terms of software. Here, however, a functional block realized by their cooperation is depicted. Therefore, these functional blocks can be realized in various forms by a combination of hardware and software.

[0027] The operation of the ventilation device with the above configuration will be explained. FIG. 3 is a flowchart showing the control of the control unit 6 according to Embodiment 1. Here, in the flowchart, numbers are assigned with S as the initial letter. For example, S1 etc. indicate processing steps. However, the magnitude of the numerical values indicating the processing steps has no relation to the processing order.

[0028] First, the exhaust control unit 24 controls the exhaust volume of the exhaust fan 4 in the normal operation mode (S1).

[0029] The vibration level acquisition unit 21 acquires the vibration level from the vibration sensor 5 (S2).

[0030] The determination unit 23 determines whether the vibration level acquired by the vibration level acquisition unit 21 is equal to or higher than the threshold value (S3). If the vibration level is less than the threshold value, the determination unit 23 determines that there is no possibility of a fire occurring within the predetermined space, and the exhaust control unit 24 continues the normal operation mode (Yes in S3 → S1).

[0031] If the vibration level is equal to or higher than the threshold value, the determination unit 23 determines that there may be a fire occurring in the predetermined space, and the exhaust control unit 24 controls the exhaust volume of the exhaust fan 4 to the maximum exhaust volume (No in S3 → S4). Thereby, it is possible to suppress the health damage of the user in the case of a fire. Note that although the exhaust control unit 24 controls the exhaust volume of the exhaust fan 4 to the maximum exhaust volume, it may control the exhaust volume of the exhaust fan 4 to be equal to or higher than a predetermined exhaust volume. The predetermined exhaust volume is, for example, an exhaust volume larger than the value in the middle of the minimum value and the maximum value among the settable exhaust volumes.

[0032] As described above, the first embodiment has been described. However, the present disclosure is not limited to the first embodiment at all, and it can be easily inferred that various improvements and modifications are possible without departing from the spirit of the present disclosure. In addition, the numerical values given in the first embodiment above are examples, and it is of course possible to adopt other numerical values.

[0033] For example, the ventilation device may further include a particulate concentration sensor. The particulate concentration sensor detects the space particulate concentration, which is the particulate concentration in the predetermined space. For example, the particulate concentration sensor is provided near the suction port 2 and detects the space particulate concentration by detecting the particulate concentration of the air taken in from the predetermined space. Known techniques are used for the detection of the particulate concentration.

[0034] After the determination unit 23 determines that there may be a fire occurring in the predetermined space and the exhaust control unit 24 controls the exhaust volume of the exhaust fan 4 to the maximum exhaust volume, exhaust volume control based on the space particulate concentration may be performed. Specifically, after the exhaust control unit 24 controls the exhaust volume of the exhaust fan 4 to the maximum exhaust volume, the control unit 6 periodically or constantly acquires the space particulate concentration detected by the particulate concentration sensor. Then, when the state where the space particulate concentration is equal to or lower than the predetermined concentration continues for a predetermined time or more, the exhaust control unit 24 returns the control of the exhaust volume of the exhaust fan 4 to the normal operation mode.

[0035] Here, when the state where the spatial particulate concentration is below a predetermined concentration continues for a predetermined time or longer, the determination unit 23 determines that there may be a fire in the predetermined space. However, in reality, it is highly likely that there is no fire in the predetermined space. Therefore, when the state where the spatial particulate concentration is below a predetermined concentration continues for a predetermined time or longer, it is determined that there is actually no fire in the predetermined space, and the exhaust control unit 24 returns the exhaust volume of the exhaust fan 4 to the exhaust volume in the normal operation mode. The predetermined concentration and the predetermined time are values determined in advance through experiments or the like and can be arbitrarily set. Thereby, the determination accuracy of whether there is a fire in the predetermined space can be improved. Also, when there is actually no fire in the predetermined space, an appropriate ventilation volume can be achieved. Further, the wasted power generated by continuing the exhaust at the maximum exhaust volume despite there being no fire in the predetermined space can be suppressed.

[0036] (Embodiment 2) Next, Embodiment 2 will be described. In Embodiment 2, the description will focus on the differences from Embodiment 1. Embodiment 2 relates to a ventilation device that executes exhaust volume control of an exhaust fan in the same manner as Embodiment 1. In the case of Embodiment 1, when it is determined that there may be a fire in the predetermined space, the exhaust volume of the exhaust fan is controlled to the maximum exhaust volume. However, in Embodiment 2, slightly different control is performed. The configuration of the ventilation device according to Embodiment 2 is the same as that in FIG. 1, but the control content by the control unit is slightly different. This will be described in detail below.

[0037] With reference to FIG. 4, each function of the control unit 6 according to the second embodiment will be described. The control unit 6 of the second embodiment includes a vibration level acquisition unit 21, a storage unit 22, a determination unit 23, and an exhaust control unit 24.

[0038] The vibration level acquisition unit 21, the storage unit 22, and the determination unit 23 of the second embodiment are the same as those in the first embodiment, and thus the description thereof is omitted.

[0039] The exhaust control unit 24 in Embodiment 2 controls the exhaust volume of the exhaust fan 4 in the normal operation mode as in Embodiment 1. The exhaust control unit 24 in Embodiment 2 also controls the exhaust volume of the exhaust fan 4 based on the determination result of the determination unit 23.

[0040] In Embodiment 1 and Embodiment 2, the determination unit 23 determines that there may be a fire in the predetermined space if the magnitude of the vibration measured by the vibration sensor 5 is equal to or greater than the threshold value. When the determination unit 23 determines that there may be a fire in the predetermined space, the exhaust control unit 24 in Embodiment 1 controls the exhaust volume of the exhaust fan 4 to the maximum exhaust volume. That is, the exhaust control unit 24 in Embodiment 1 controls the exhaust volume of the exhaust fan 4 to the maximum exhaust volume immediately when the magnitude of the vibration becomes equal to or greater than the threshold value.

[0041] However, after the determination unit 23 in Embodiment 2 determines that there may be a fire in the predetermined space, the exhaust control unit 24 in Embodiment 2 stops the operation of the exhaust fan 4 until the magnitude of the vibration measured by the vibration sensor 5 becomes less than the threshold value. That is, the exhaust control unit 24 in Embodiment 2 stops the operation of the exhaust fan 4 (sets the exhaust volume to zero) until the magnitude of the vibration becomes less than the threshold value after the magnitude of the vibration becomes equal to or greater than the threshold value.

[0042] Then, after the determination unit 23 in Embodiment 2 determines that there may be a fire in the predetermined space, when the magnitude of the vibration measured by the vibration sensor 5 becomes less than the threshold value, the exhaust control unit 24 in Embodiment 2 controls the exhaust volume of the exhaust fan 4 to the maximum exhaust volume. That is, the exhaust control unit 24 in Embodiment 2 controls the exhaust volume of the exhaust fan 4 to the maximum exhaust volume when the magnitude of the vibration becomes less than the threshold value after the magnitude of the vibration becomes equal to or greater than the threshold value.

[0043] Here, the reason for performing the above exhaust volume control will be explained. When a major earthquake occurs within a predetermined space, it is preferable to stop the exhaust fan 4 during the occurrence of the major earthquake. This is because rotating the exhaust fan 4 while the ventilation device is vibrating significantly during the major earthquake can cause the exhaust fan 4 (ventilation device) to malfunction. Rotating the exhaust fan 4 while the ventilation device is vibrating significantly may also cause the exhaust fan 4 (ventilation device) to catch fire in some cases. To prevent such malfunctions and fires of the exhaust fan 4 (ventilation device), the exhaust control unit 24 of the second embodiment stops the operation of the exhaust fan 4 after the vibration magnitude exceeds the threshold value and until the vibration magnitude changes to less than the threshold value.

[0044] And the fact that the vibration magnitude changes to less than the threshold value means that the major earthquake has subsided and the vibration of the ventilation device has decreased. That is to say, it can be said that it is a state where it is okay to restart and rotate the exhaust fan 4. In other words, it can be said that the possibility of malfunction and fire of the exhaust fan 4 (ventilation device) is low even if the exhaust fan 4 is rotated. Therefore, the exhaust control unit 24 of the second embodiment controls the exhaust volume of the exhaust fan 4 to the maximum exhaust volume when the vibration magnitude changes to less than the threshold value after exceeding the threshold value. When a fire occurs within a predetermined space, it is desired to exhaust as much dust, carbon monoxide, etc. within the predetermined space from the predetermined space as possible, that is, to perform as much exhaust from the predetermined space as possible. This is because health hazards such as carbon monoxide poisoning of the user can be suppressed by the exhaust. Thus, the exhaust volume of the exhaust fan 4 is controlled to the maximum exhaust volume to suppress the health hazards of the user. Note that since the occurrence of malfunctions of the exhaust fan 4 is prevented by stopping the operation of the exhaust fan 4 until the vibration magnitude changes to less than the threshold value, the exhaust volume of the exhaust fan 4 can be controlled to the maximum exhaust volume without problems even when the vibration magnitude changes to less than the threshold value. The explanation of the reason for performing the above exhaust volume control is hereby completed.

[0045] Each functional block of the control unit 6 according to the second embodiment can also be realized by elements and mechanical devices including the CPU of a computer in terms of hardware, and can be realized by a computer program or the like in terms of software. Therefore, these functional blocks can be realized in various forms by combinations of hardware and software.

[0046] Next, the operation of the ventilation device according to the second embodiment will be described. FIG. 5 is a flowchart showing the control of the control unit 6 according to the second embodiment.

[0047] First, the exhaust control unit 24 controls the exhaust volume of the exhaust fan 4 in the normal operation mode (S1).

[0048] The vibration level acquisition unit 21 acquires the vibration level from the vibration sensor 5 (S2).

[0049] The determination unit 23 determines whether the vibration level acquired by the vibration level acquisition unit 21 is equal to or greater than a threshold value (S3). If the vibration level is less than the threshold value, the determination unit 23 determines that there is no possibility of a fire occurring in the predetermined space, and the exhaust control unit 24 continues the normal operation mode (Yes in S3 → S1).

[0050] If the vibration level is equal to or greater than the threshold value, the determination unit 23 determines that there is a possibility of a fire occurring in the predetermined space. However, the exhaust control unit 24 first stops the operation of the exhaust fan 4 (No in S3 → S5). This can prevent the failure and ignition of the exhaust fan 4 (ventilation device).

[0051] Next, the vibration level acquisition unit 21 acquires the vibration level from the vibration sensor 5 (S6).

[0052] Then, the exhaust volume control unit 24 (control unit 6) determines whether the vibration level acquired by the vibration level acquisition unit 21 is less than the threshold value (S7). That is, the exhaust control unit 24 determines whether the vibration level has changed from equal to or greater than the threshold value to less than the threshold value.

[0053] If the vibration level is equal to or higher than the threshold value, the vibration level acquisition unit 21 acquires the vibration level from the vibration sensor 5 again (No at S7 → S6).

[0054] If the vibration level is less than the threshold value, the exhaust control unit 24 controls the exhaust volume of the exhaust fan 4 to the maximum exhaust volume (Yes at S7 → S8). Thereby, it is possible to suppress health damage to the user in the case where a fire has occurred. Note that although the exhaust control unit 24 controls the exhaust volume of the exhaust fan 4 to the maximum exhaust volume, it may be controlled to be equal to or higher than a predetermined exhaust volume. The predetermined exhaust volume is, for example, an exhaust volume larger than a value intermediate between the minimum value and the maximum value among the settable exhaust volumes.

[0055] As described above, the second embodiment has been described. However, it can be easily inferred that the present disclosure is not limited to the second embodiment at all, and various improvements and modifications are possible without departing from the gist of the present disclosure.

[0056] For example, in the second embodiment, after it is determined by the determination unit 23 that there is a possibility that a fire has occurred in the predetermined space, the exhaust control unit 24 stops the operation of the exhaust fan 4 until the magnitude of the vibration measured by the vibration sensor 5 changes to less than the threshold value. However, after it is determined by the determination unit 23 that there is a possibility that a fire has occurred in the predetermined space, the exhaust control unit 24 may control the exhaust volume of the exhaust fan 4 to be equal to or less than a predetermined exhaust volume until the magnitude of the vibration measured by the vibration sensor 5 changes to less than the threshold value. In order to prevent failure and ignition of the exhaust fan 4 (ventilation device), it is preferable to stop the operation of the exhaust fan 4, but by setting the exhaust volume of the exhaust fan 4 to be equal to or less than the predetermined exhaust volume, it is also possible to suppress the possibility of failure and ignition of the exhaust fan 4 (ventilation device). The predetermined exhaust volume is for suppressing failure and ignition of the exhaust fan 4 (ventilation device), and is a value determined in advance by experiments or the like and can be arbitrarily set.

[0057] Also, similar to Embodiment 1, the ventilation device of Embodiment 2 may further include a particulate concentration sensor. After the determination unit 23 determines that there may be a fire in the predetermined space, if the magnitude of the vibration measured by the vibration sensor 5 changes to less than the threshold value, and after the exhaust control unit 24 controls the exhaust volume of the exhaust fan 4 to the maximum exhaust volume, exhaust volume control based on the space particulate concentration may be performed. The exhaust volume control based on the space particulate concentration is the same as the content described in Embodiment 1.

[0058] (Summary of the Present Disclosure) The ventilation device according to the present disclosure includes an exhaust fan that exhausts a predetermined space, a vibration sensor that measures the magnitude of vibration in the predetermined space, a determination unit that determines whether there may be a fire in the predetermined space based on the magnitude of the vibration measured by the vibration sensor, and an exhaust control unit that controls the exhaust volume of the exhaust fan based on the determination result of the determination unit. Thereby, ventilation control can be performed in consideration of the case where there may be a fire in the predetermined space.

[0059] Also, if the magnitude of the vibration measured by the vibration sensor is equal to or greater than the threshold value, the determination unit may determine that there may be a fire in the predetermined space. Thereby, it is possible to grasp that there may be a fire in the predetermined space.

[0060] Also, when the determination unit determines that there may be a fire in the predetermined space, the exhaust control unit may control the exhaust volume of the exhaust fan to the maximum exhaust volume. Thereby, it is possible to suppress health hazards such as carbon monoxide poisoning of the user in the event of a fire.

[0061] Also, after it is determined by the determination unit that there may be a fire in a predetermined space, if the magnitude of the vibration measured by the vibration sensor changes to less than the threshold value, the exhaust control unit may control the exhaust volume of the exhaust fan to the maximum exhaust volume. Thereby, it is possible to suppress health damage such as carbon monoxide poisoning of the user in the case of a fire. Further, since the exhaust volume of the exhaust fan is set to the maximum exhaust volume after the shaking due to an earthquake becomes small, it is possible to suppress the failure and ignition of the exhaust fan.

[0062] Also, after it is determined by the determination unit that there may be a fire in a predetermined space, the exhaust control unit may stop the operation of the exhaust fan until the magnitude of the vibration measured by the vibration sensor changes to less than the threshold value. Thereby, it is possible to prevent the failure and ignition of the exhaust fan. can be achieved.

[0063] Also, after it is determined by the determination unit that there may be a fire in a predetermined space, the exhaust control unit may control the exhaust volume of the exhaust fan to be equal to or less than a predetermined exhaust volume until the magnitude of the vibration measured by the vibration sensor changes to less than the threshold value. Thereby, it is possible to suppress the failure and ignition of the exhaust fan.

[0064] Also, the vibration sensor may be an acceleration sensor.

[0065] Also, the vibration sensor may be a displacement sensor.

Industrial Applicability

[0066] The present disclosure is useful as a ventilation device for exhausting air from a predetermined space.

Explanation of Signs

[0067] 1 Housing 2 Suction Port 3 Outlet 4 Exhaust Fan 5 Vibration Sensor 6 Control Unit 7 Duct 21 Vibration Level Acquisition Unit 22 Memory unit 23 Determination unit 24 Exhaust control unit

Claims

1. An exhaust fan for exhausting air in a predetermined space, a vibration sensor for measuring the magnitude of vibration in the predetermined space, a determination unit for determining whether there is a possibility of a fire occurring in the predetermined space based on the magnitude of vibration measured by the vibration sensor, and a ventilation device comprising an exhaust control unit for controlling the exhaust volume of the exhaust fan based on the determination result of the determination unit.

2. The determination unit, if the magnitude of vibration measured by the vibration sensor is equal to or greater than a threshold value, determines that there is a possibility of a fire occurring in the predetermined space. The ventilation device according to Claim 1.

3. The exhaust control unit, when the determination unit determines that there is a possibility of a fire occurring in the predetermined space, controls the exhaust volume of the exhaust fan to the maximum exhaust volume. The ventilation device according to Claim 1.

4. After the determination unit determines that there is a possibility of a fire occurring in the predetermined space, when the magnitude of vibration measured by the vibration sensor changes to less than the threshold value, the exhaust control unit controls the exhaust volume of the exhaust fan to the maximum exhaust volume. The ventilation device according to Claim 2.

5. After the determination unit determines that there is a possibility of a fire occurring in the predetermined space, until the magnitude of vibration measured by the vibration sensor changes to less than the threshold value, the exhaust control unit stops the operation of the exhaust fan. The ventilation device according to Claim 4.

6. After the determination unit determines that there is a possibility of a fire occurring in the predetermined space, until the magnitude of vibration measured by the vibration sensor changes to less than the threshold value, the exhaust control unit controls the exhaust volume of the exhaust fan to be equal to or less than a predetermined exhaust volume. The ventilation device according to Claim 4.

7. The vibration sensor is an acceleration sensor. The ventilation device according to Claim 1.

8. The vibration sensor is a displacement sensor. The ventilation device according to Claim 1.

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