JP2022045631A - Ventilator - Google Patents

Abstract

To obtain a ventilator which can detect a failure of an air duct changeover part without adding special hardware, in the ventilator having an environment sensor.SOLUTION: A ventilator 10A comprises a main body part 11, a blower 23, an air duct changeover part 12, one or more environment sensors, and a control part 14. The main body part has one or more air ducts for connecting an intake port 21 for sucking air, and an exhaust port 22 for blowing out the air which is sucked from the intake port. The blower is arranged in the air duct, sucks air from the intake port by rotating a fan 25, and introduces the sucked air to the exhaust port. The air duct changeover part switches a path of air which is scavenged by the blower in the air duct. The environment sensor detects a character of air. The control part controls operations of the blower and the air duct changeover part. The control part determines the presence or absence of the occurrence of a failure of the air duct changeover part on the basis of a control state of the air duct changeover part, and data of an air character index indicating the character of the air which is detected by the environment sensor.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to a ventilator having an air passage switching section.

Conventionally, a ventilation device that controls a blower and an air passage switching unit is known from the information of an environment sensor that detects the properties of air such as a humidity sensor connected to the ventilation device. In such a ventilation device, the air passage switching portion may not operate normally due to damage to the motor or the connecting portion constituting the air passage switching portion. If the air passage switching unit does not operate normally, the air ventilation, which is the purpose of the ventilation device, cannot be performed normally, which may impair the comfort of the indoor environment. Therefore, in Patent Document 1, one of the rotation speed and the motor current of the blower provided in the ventilation system is controlled to be constant, and the other change amount of the rotation speed and the motor current of the blower during the opening / closing operation of the air passage switching unit is used. , A technique for detecting a failure of an air passage switching unit is disclosed.

Japanese Unexamined Patent Publication No. 2011-43250

However, when the technique described in Patent Document 1 is applied to a ventilation device provided with an environment sensor to detect a failure of the air passage switching portion, the ventilation device provided with the environment sensor determines the rotation speed and the motor current of the blower. It must have a function that can be controlled and detected. For this reason, in a ventilation device that cannot control or detect the rotation speed and motor current of the blower, it is not possible to detect a failure in the air passage switching section, or it is necessary to add dedicated hardware. There was a problem that the cost to do was increased.

The present disclosure has been made in view of the above, and is to obtain a ventilation device capable of detecting a failure of the air passage switching section without adding special hardware in a ventilation device equipped with an environment sensor. The purpose.

In order to solve the above-mentioned problems and achieve the object, the ventilation device of the present disclosure includes a main body unit, a blower, an air passage switching unit, one or more environment sensors, and a control unit. The main body has one or more air passages connecting an intake port for sucking air and an exhaust port for blowing out air sucked from the intake port. The blower is provided in the air passage, and by rotating the fan, air is sucked from the intake port and the sucked air is guided to the exhaust port. The air passage switching unit switches the path of the air swept by the blower in the air passage. The environment sensor detects the nature of the air sucked in from the intake port or the air blown out from the exhaust port. The control unit controls the operation of the blower and the air passage switching unit. The control unit determines whether or not a failure has occurred in the air passage switching unit based on the control state of the air passage switching unit and the data of the air quality index indicating the properties of the air detected by the environment sensor.

According to the present disclosure, in a ventilation device provided with an environment sensor, it is possible to detect a failure of the air passage switching portion without adding special hardware.

The figure which shows typically an example of the structure of the ventilation apparatus by Embodiment 1. Schematic diagram schematically showing an example of the configuration of the ventilation device according to the first embodiment. The figure which shows typically an example of the configuration when the air passage switching part of the ventilation apparatus by Embodiment 1 is in an open state. The figure for demonstrating an example of the ventilation control in a normal state using a temperature sensor in the ventilation apparatus according to Embodiment 1. The figure which shows an example of the relationship between the room temperature and the outside air temperature in the ventilation target space where the ventilation apparatus by Embodiment 1 is provided. The figure which shows an example of the transition of the room temperature at the time of the closing failure of the air passage switching part of the ventilation apparatus by Embodiment 1. The figure which shows an example of the transition of the room temperature at the time of opening failure of the air passage switching part of the ventilation apparatus by Embodiment 1. The figure which shows typically an example of the structure of the ventilation apparatus by Embodiment 2. A block diagram schematically showing an example of the main functional configuration of the control unit of the ventilation device according to the second embodiment. The figure explaining an example of the normal operation state of the ventilation apparatus by Embodiment 2. The figure explaining an example of the normal operation state of the ventilation apparatus by Embodiment 2. The figure which shows an example of the air path when the ventilation apparatus by Embodiment 2 becomes a closed failure. The figure which shows an example of the air flow path at the time of opening failure of the ventilation apparatus by Embodiment 2. The figure for demonstrating an example of the ventilation control using the gas sensor when the ventilation apparatus by Embodiment 2 is normal. The figure which shows an example of the control procedure which detects a closing failure using a gas sensor in the ventilation apparatus according to Embodiment 2. The figure which shows an example of the control procedure which detects an open failure using a gas sensor in the ventilation apparatus according to Embodiment 2. A flowchart showing an example of a failure detection method of the air passage switching portion in the ventilation device according to the second embodiment. The figure which shows typically an example of the structure of the ventilation apparatus by Embodiment 3. The figure for demonstrating an example of ventilation control in a normal state using a humidity sensor in the ventilation apparatus according to Embodiment 3. The figure which shows an example of the relationship between the indoor humidity and the outdoor humidity in the room where the ventilation device by Embodiment 3 is provided. The figure which shows an example of the transition of the room humidity at the time of the closing failure of the air passage switching part of the ventilation apparatus by Embodiment 3. The figure which shows an example of the relationship between the room humidity at the time of normal operation and the time of opening failure in the room where the ventilation system by Embodiment 3 is provided. Schematic diagram showing an example of the configuration of the ventilation device according to the fourth embodiment. Schematic diagram showing an example of the configuration of the ventilation device according to the fourth embodiment. A block diagram schematically showing an example of the main functional configuration of the control unit in the ventilation device according to the fourth embodiment. The figure which shows an example of the relationship between the supply air temperature estimated value and the supply air temperature actual measurement value when the ventilation apparatus according to Embodiment 4 is operated under a certain condition. A flowchart showing an example of the procedure of failure determination processing in the ventilation device according to the fourth embodiment. A block diagram schematically showing an example of the hardware configuration of the control unit provided in the ventilation device according to the first to fourth embodiments.

Hereinafter, the ventilation apparatus according to the embodiment of the present disclosure will be described in detail with reference to the drawings.

Embodiment 1.
FIG. 1 is a diagram schematically showing an example of the configuration of the ventilation device according to the first embodiment. The ventilation device 10A according to the first embodiment is installed in a range hood or a ceiling-embedded ventilation fan equipped with a temperature sensor 13A, which is a kind of environment sensor, and an air passage switching unit 12, or in a wall leading to the outside air. It is a ventilation device such as a fan for pipes. Environment sensor is a general term for sensors that can detect temperature, humidity, the amount of gas components in the air, or the amount of particles in the air. An example of the air passage switching unit 12 is an electric shutter.

The ventilation device 10A according to the first embodiment is provided in an environment where the temperature tends to be temporarily high, such as a cooking room 101 in a store 100 such as a convenience store. The cooking room 101 becomes a ventilation target space by the ventilation device 10A. In such an environment, the ventilation device 10A exceeds the operation start set temperature, which is the temperature at which the ventilation operation by the ventilation device 10A is started, and the indoor temperature, which is the indoor temperature detected by the mounted temperature sensor 13A. In this case, the operation is started, and the operation is stopped when the room temperature falls below the operation stop set temperature, which is the temperature at which the ventilation operation is stopped during the ventilation operation. The air passage switching unit 12 mounted on the ventilation device 10A according to the first embodiment prevents the intrusion of dirty outside air or cold air in winter or wind leakage in strong wind into the cooking room 101 when the operation is stopped, and is comfortable. Used to maintain indoor space.

In FIG. 1, the ventilation device 10A opens the air passage switching unit 12 during operation, guides air from the cooking room 101 in the store 100 to the outside along the airflow direction 111, and closes the air passage switching unit 12 when stopped. Block the flow of air. Hereinafter, the state in which the air passage switching unit 12 is open is referred to as an open state, and the state in which the air passage switching unit 12 is closed is referred to as a closed state.

If the air passage switching portion 12 of the ventilation device 10A is stuck in the open state due to a failure, the outdoor air flows into the cooking room 101 along the airflow direction 112 even if the ventilation device 10A is stopped. In particular, in the toilets of convenience stores, restaurants, etc., a type 3 ventilation fan that adopts a ventilation method in which exhaust is forcibly performed by mechanical ventilation and air is supplied naturally from the air supply port is installed. Therefore, the room tends to have negative pressure. As a result, the outdoor air is more likely to flow into the ventilation target space. In the following, a failure in which the air passage switching unit 12 is stuck in the open state is referred to as an open failure.

Further, when the air passage switching portion 12 of the ventilation device 10A is stuck in the closed state due to a failure, even if the ventilation device 10A is operated, the high temperature air in the cooking room 101 which is the ventilation target space is directed to the airflow direction 111. It is not possible to lead to the outside of the room along. In the following, a failure in which the air passage switching unit 12 is stuck in the closed state is referred to as a closed failure.

FIG. 2 is a schematic diagram schematically showing an example of the configuration of the ventilation device according to the first embodiment. FIG. 2 shows a case where the air passage switching unit 12 of the ventilation device 10A is stopped in a normal state. As shown in FIG. 2, the ventilation device 10A includes a main body unit 11, an air passage switching unit 12, a temperature sensor 13A, and a control unit 14.

The main body 11 has an intake port 21 that sucks in indoor air, which is a space to be ventilated, an exhaust port 22 that blows out air sucked from the intake port 21, and an exhaust port 22 that sucks air from the intake port 21 and exhausts the sucked air. A blower 23 that leads to 22 is provided. The blower 23 is provided in the air passage connecting the intake port 21 and the exhaust port 22. The main body 11 is arranged on the ceiling or a wall leading to the outside air so that the intake port 21 is on the indoor side and the exhaust port 22 is on the outdoor side. The blower 23 has a fan drive unit 24 and a fan 25. The fan drive unit 24 rotates the fan 25, and the fan 25 creates an air flow that sucks air from the intake port 21 and discharges air from the exhaust port 22 by the rotation.

The air passage switching portion 12 is provided on the exhaust port 22 side of the main body portion 11 and switches the path of the air swept by the blower 23 in the air passage. As shown in FIG. 2, the air passage switching portion 12 is closed so as to cover the exhaust port 22 of the main body portion 11 when stopped. FIG. 3 is a diagram schematically showing an example of a configuration when the air passage switching portion of the ventilation device according to the first embodiment is in an open state. As shown in FIG. 3, the air passage switching portion 12 is in an open state so that the exhaust port 22 of the main body portion 11 is not completely covered during operation.

The temperature sensor 13A detects the room temperature in which the ventilation device 10A is provided, and outputs the temperature data as a result of the detection to the control unit 14. The temperature sensor 13A is an example of an environment sensor that detects the property of the air sucked in from the intake port 21 or the air blown out from the exhaust port 22, and the indoor temperature data detected by the temperature sensor 13A is the property of air. This is an example of an air quality index showing air quality.

The control unit 14 acquires the room temperature from the temperature sensor 13A and controls the operation of the fan drive unit 24 for rotating the fan 25 and the operation of the air passage switching unit 12 based on the room temperature. Specifically, the control unit 14 controls the ventilation device 10A to execute the ventilation operation when the room temperature exceeds the operation start set temperature, and when the room temperature falls below the operation stop set temperature, the control unit 14 controls. The ventilation device 10A is controlled to stop the ventilation operation. More specifically, when the room temperature exceeds the operation start set temperature, the control unit 14 controls the fan drive unit 24 so as to rotate the fan 25, and the air passage switching unit 12 is opened. do. When the room temperature falls below the operation stop set temperature, the control unit 14 controls the fan drive unit 24 so as to stop the fan 25, and closes the air passage switching unit 12. When the room temperature falls below the operation stop set temperature, the control unit 14 performs a residual delay operation in which the fan 25 is continuously rotated for a predetermined period, and stops the fan 25 after the residual delay operation. The fan drive unit 24 may be controlled. Further, as will be described later, the control unit 14 detects a failure of the air passage switching unit 12 by using the room temperature detected by the temperature sensor 13A.

Next, a method of detecting the failure of the air passage switching unit 12 by the control unit 14 will be described with reference to specific examples. Here, as shown in FIG. 1, a case where the ventilation device 10A is provided in the cooking room 101 will be taken as an example.

FIG. 4 is a diagram for explaining an example of normal ventilation control using a temperature sensor in the ventilation device according to the first embodiment. FIG. 4 shows a graph A1 showing a change in the indoor temperature of the cooking room 101, a graph A2 showing the usage status of the cooking equipment in the cooking room 101, and a graph A3 showing the operating status of the ventilation device 10A. There is. In FIG. 4, the horizontal axis indicates time, and indicates the elapsed time from a certain time as a reference. Here, the point where the horizontal axis intersects the vertical axis is used as a reference. The vertical axis of the graph A1 shows the room temperature. Graph A1 shows the transition of the room temperature data acquired from the temperature sensor 13A when the ventilation device 10A starts operation in the cooking room 101 in a normal state, that is, in a state where the air passage switching unit 12 is not out of order. Has been done. In the following, it is assumed that the operation start set temperature is 40 ° C. and the operation stop set temperature is 35 ° C.

First, at the time T1 before the start of cooking, the room temperature is almost stable at about 25 ° C. At this time, as shown in FIG. 2, the air passage switching unit 12 of the ventilation device 10A is in the closed state, and the fan drive unit 24 is in the stopped state. In one example, the time T1 is between 0 and 4 minutes.

Then, as shown in graph A2, cooking starts at time T2. When cooking is started, the room temperature rises due to the generation of heat due to the use of cooking equipment. In one example, the time T2 is 4 minutes.

When the room temperature rises and the room temperature reaches the operation start set temperature of 40 ° C. or higher at time T3, the control unit 14 starts the operation of the ventilation device 10A and starts the operation as shown in the graph A3. do. That is, as shown in FIG. 3, the control unit 14 rotates the fan 25 by opening the air passage switching unit 12 and operating the fan drive unit 24. As a result, the high temperature air in the cooking room 101 is discharged to the outside. In one example, the time T3 is 5 minutes. The operation of operating the ventilation device 10A is also referred to as a ventilation operation.

After that, the room temperature rises, and at time T4, the room temperature rises to nearly 50 ° C. While using the cooking equipment, the room temperature is maintained at around 50 ° C due to the influence of the heat generated intermittently. In one example, the time T4 is 6 minutes.

Then, as shown in Graph A2, when the use of the cooking equipment ends at time T5, the room temperature begins to gradually decrease. At time T6, when the heat generation has subsided and the room temperature has begun to fall and the room temperature has fallen below 45 ° C., the control unit 14 determines that the use of the cooking equipment has been stopped. In the first embodiment, 45 ° C. is the cooking equipment use stop temperature, which is the temperature at which the control unit 14 determines that the use of the cooking equipment has been stopped. In other words, when the room temperature is 45 ° C. or higher, the control unit 14 determines that heat is intermittently generated because the cooking equipment is in use. In one example, the time T5 is 10 minutes and the time T6 is 11 minutes.

When the room temperature drops further and detects that the room temperature has fallen below the operation stop set temperature at time T7, the control unit 14 does not stop the ventilation operation, but additionally, for a predetermined period of time, the air passage. The switching unit 12 is opened, and the residual delay operation is performed to continue the state in which the fan drive unit 24 is operated. An example of the period of late operation is 10 minutes. It should be noted that, due to the late operation, air continuously flows into the cooking room 101 from the communicating space, and the room temperature is the state before the start of use of the cooking equipment during the late operation, in FIG. Will settle to about 25 ° C. The period from the time T6 when it is determined that the use of the cooking equipment is stopped to the time T7 when the room temperature becomes equal to or lower than the operation stop set temperature is assumed to be ΔTa. In one example, the time T6 is 11 minutes, the time T7 is 13 minutes, and ΔTa at this time is 2 minutes.

After that, at the time T8 when the residual delay operation ends, the control unit 14 stops the ventilation operation. That is, the control unit 14 closes the air passage switching unit 12 and stops the operation of the fan drive unit 24. As a result, the air inside the cooking room 101 is exhausted to the outside, and the airflow from the room to the outside generated by the ventilation operation is eliminated, but the space between the cooking room 101 and the 100 spaces in the store communicating with the cooking room 101. The convection of air between them keeps the room temperature close to the room temperature before the start of use of the cooking utensil. In one example, the time T8 is 23 minutes.

In addition, during the period of the residual late operation, in the state before starting the use of the cooking equipment, in FIG. 4, even if the room temperature does not drop to about 25 ° C., the cooking room 101 and the cooking room 101 are communicated with each other. Due to the convection of air to and from the space, the room temperature drops slowly and eventually settles near the room temperature before the start of use of the cooking equipment.

Further, FIG. 4 shows a case where the room temperature before starting the use of the cooking equipment is about 25 ° C., which is an example. Therefore, in reality, the stable indoor temperature differs depending on the season, the weather, the operating state of the air conditioner in the space communicating with the cooking room 101, and the like.

Next, the difference between the change in the indoor temperature and the change in the outside air temperature will be supplementarily explained. In stores such as convenience stores, the air conditioner operates to keep the indoor temperature constant, so it is less susceptible to changes in outdoor weather and temperature throughout the day, compared to outdoor temperature changes. The temperature change in the room becomes small.

FIG. 5 is a diagram showing an example of the relationship between the indoor temperature and the outside air temperature in the ventilation target space provided with the ventilation device according to the first embodiment. In FIG. 5, the horizontal axis indicates time, the vertical axis on the left side indicates relative humidity (%) outdoors, and the vertical axis on the right side indicates temperature (° C.). Here, the weather data of the end of May in Tokyo and the change in the room temperature when the air passage switching unit 12 of the ventilation device 10A is normal are shown. The alternate long and short dash line in the figure indicates the outside air temperature (° C.), which is one of the meteorological data, and the dotted line indicates the indoor temperature (° C.) when the air passage switching unit 12 is normal. The solid line in the figure is shown with reference to the outdoor relative humidity (%), which is one of the meteorological data. In the following, in order to explain the difference regarding the temperature change between indoors and outdoors, the cooking equipment is not used in the cooking room 101, the ventilation device 10A continues to be stopped, in other words, the air passage switching unit 12 is closed. The case where the state is continued will be described.

As shown in FIG. 5, the temperature difference between morning and evening in the outside air temperature is often 10 ° C. or more regardless of the weather. On the other hand, in stores that are open 24 hours a day, such as convenience stores, the inside of the store is constantly air-conditioned, and the fluctuation range of the indoor temperature is small regardless of the season or the weather. The outdoor relative humidity changes depending on the weather and the time zone.

FIG. 6 is a diagram showing an example of the transition of the indoor temperature when the air passage switching portion of the ventilation device according to the first embodiment is closed. FIG. 6 shows a graph A1 showing a change in the indoor temperature of the cooking room 101, a graph A2 showing the usage status of the cooking equipment in the cooking room 101, and a graph A3 showing the operating status of the ventilation device 10A, as in FIG. Is shown. In FIG. 6, the horizontal axis indicates time, and indicates the elapsed time from a certain time as a reference. Here, the point where the horizontal axis intersects the vertical axis is used as a reference. The vertical axis of the graph A1 shows the room temperature. Graph A1 shows the transition of the room temperature data acquired from the temperature sensor 13A when the closing failure of the air passage switching unit 12 occurs at the timing when the ventilation operation is started in the cooking room 101. In the following, it is assumed that the operation start set temperature is 40 ° C. and the operation stop set temperature is 35 ° C.

Times T1 to T7 in FIG. 6 indicate the same times as times T1 to T7 in FIG. The changes in the room temperature, the usage status of the cooking equipment, and the operating status of the ventilation device 10A during the period from the time T1 before the start of cooking to the time T5 when the use of the cooking equipment ends are from the time T1 to T5 in FIG. Since it is the same, the description thereof will be omitted. However, since the closing failure occurred at time T2, the air passage switching unit 12 was closed, and the high temperature air in the cooking room 101 was not discharged to the outside.

After time T5, although the heat generation due to the use of the cooking equipment has subsided, the high temperature air in the cooking room 101 cannot be discharged to the outside. Therefore, in the case of FIG. 6, even at the time T6 when one minute has passed since the use of the cooking equipment was stopped, it is not possible to detect the temperature at which the cooking equipment is stopped at 45 ° C. or lower.

Further, when the air passage switching unit 12 fails to close, the high temperature air in the cooking room 101 cannot be discharged to the outside, so that the space between the cooking room 101 and the space communicating with the cooking room 101 continues. The room temperature of the cooking room 101 gradually decreases due to the convection of air in the cooking room 101. However, the rate of decrease in the indoor temperature of the cooking chamber 101 is slower than that in FIG. 4 when the air passage switching unit 12 is normal. Therefore, in FIG. 4, the operation stop set temperature of 35 ° C. has already been reached at time T7, but in the case of FIG. 6, the operation stop set temperature has not been reached at time T7.

Due to the convection of air between the cooking chamber 101 and the space communicating with the cooking chamber 101, the temperature of the hot air in the cooking chamber 101 continues to gradually decrease. As a result, at time T9, the room temperature becomes 45 ° C. or lower, which is the temperature at which the cooking equipment is stopped. In one example, the time T9 is 17 minutes. More specifically, the temperature at which the cooking equipment is stopped is detected 7 minutes after the time T5 when the cooking equipment is actually stopped, and 1 minute when the air passage switching unit 12 in FIG. 4 is normal. In comparison, the detection is significantly delayed from the actual shutdown of the cooking equipment. The control unit 14 recognizes that the cooking equipment is used during the period from the time T5 when the use of the cooking equipment is actually stopped to the time T7 when the temperature at which the cooking equipment is stopped is detected.

Similarly, after that, the room temperature of the cooking room 101 continues to gradually decrease, and finally reaches 35 ° C. or lower, which is the set temperature for stopping the operation, at time T10. In one example, the time T10 is 47 minutes. Assuming that the period from the time T9 when it is determined that the use of the cooking equipment is stopped to the time T10 when the room temperature becomes equal to or lower than the operation stop set temperature is ΔTb, in the case of FIG. 6, ΔTb is 30 minutes. At time T10, the control unit 14 starts the 10-minute residual delay operation.

Similarly, during the 10-minute residual / delayed operation, the room temperature of the cooking room 101 continues to gradually decrease, and at the time T11 when the residual / delayed operation ends, the control unit 14 stops the ventilation operation. In one example, the time T11 is 57 minutes. However, in the case of FIG. 6, at time T11, the temperature before the start of operation of the cooking equipment, in this case 25 ° C., has not dropped.

Comparing FIGS. 4 and 6, the time from the time when the cooking equipment use stop temperature, which is the first value of the room temperature, is detected to the time when the operation stop set temperature, which is the second value, is detected is the wind of FIG. When the path switching section 12 is normal, ΔTa = 2 minutes, but when the air path switching section 12 in FIG. 6 is closed, ΔTb = 30 minutes, which are significantly different between the two. Therefore, the control unit 14 of the ventilation device 10A according to the first embodiment detects a closing failure of the air passage switching unit 12 due to the above time difference.

Specifically, the control unit 14 has a set temperature drop time, which is the time from the time when the cooking equipment use stop temperature is detected to the time when the operation stop set temperature is detected, and the closing failure determination, which is a reference for the occurrence of the closing failure. Compare with the reference value. Here, the set temperature decrease time corresponds to the change time, and the closed failure determination reference value corresponds to the reference information. In one example, the closed failure determination reference value can be 20 minutes. The control unit 14 determines that a closed failure has occurred when the set temperature decrease time is larger than the closed failure determination reference value, and when the set temperature decrease time is smaller than the closed failure determination reference value, the control unit 14 determines that a closed failure has occurred. It is determined that no closing failure has occurred. If the set temperature decrease time is equal to the closed failure determination reference value, it may be determined that a closed failure has occurred, or it may be determined that a closed failure has not occurred.

Next, a method for detecting an open failure will be described. FIG. 7 is a diagram showing an example of a transition of the indoor temperature when the air passage switching portion of the ventilation device according to the first embodiment is open and fails. FIG. 7 shows a graph A1 showing a change in the indoor temperature of the cooking room 101, a graph A2 showing the usage status of the cooking equipment in the cooking room 101, and a graph A3 showing the operating status of the ventilation device 10A, as in FIG. Is shown. In FIG. 7, the horizontal axis indicates time, and indicates the elapsed time from a certain time as a reference. Here, the point where the horizontal axis intersects the vertical axis is used as a reference. The vertical axis of the graph A1 shows the room temperature. Graph A1 shows the transition of the room temperature data acquired from the temperature sensor 13A when the opening failure of the air passage switching unit 12 occurs at the timing of the time T3 during the ventilation operation in the cooking room 101. In the following, it is assumed that the operation start set temperature is 40 ° C. and the operation stop set temperature is 35 ° C.

Times T1 to T8 in FIG. 7 indicate the same times as times T1 to T8 in FIG. The changes in the room temperature, the usage status of the cooking equipment, and the operating status of the ventilation device 10A during the period from the time T1 before the start of cooking to the time T8 when the operation of the ventilation device 10A is stopped are shown at times T1 to T8 in FIG. Since it is the same as above, the description is omitted. However, in the case of FIG. 7, an open failure occurs at time T3, and the air passage switching unit 12 remains open, but until the time T8 when the air passage switching unit 12 closes, the inside of the cooking room 101 is used. The hot air is discharged to the outside, and the opening failure does not substantially affect the ventilation in the room. Therefore, the operation is the same as when the air passage switching unit 12 is normal.

When the air passage switching unit 12 is normal, as shown in FIG. 4, after the ventilation device 10A stops operating at time T8, the room temperature is 25, which is equivalent to the temperature of the space communicating with the cooking room 101. It was calm to ℃. However, when the air passage switching unit 12 opens and fails, the operation of the ventilation device 10A is stopped, so that the air flow from the room to the outside is lost, but the air passage switching unit 12 remains in the open state. Therefore, the inflow of air from the outside to the inside of the room begins to occur. That is, the indoor temperature begins to change in the direction approaching the outside air temperature. For example, when the outside air temperature is about 35 ° C. in the summer, the room temperature also rises to nearly 35 ° C. at time T12 after the operation of the ventilation device 10A is stopped, as shown by the broken line in FIG. .. In addition, when the outside air temperature is about 10 ° C. in winter, the room temperature will drop to nearly 10 ° C. at time T12 after the operation of the ventilation device 10A is stopped, as shown by the alternate long and short dash line in FIG. Become.

Comparing FIGS. 4 and 7, the room temperature after the ventilation device 10A is stopped becomes 25 ° C., which is the temperature before the start of use of the cooking equipment when the air passage switching unit 12 is normal. When the road switching unit 12 has an open failure, the outside temperature is 35 ° C. in the summer and 10 ° C. in the winter, which are significantly different between the two. Therefore, the control unit 14 of the ventilation device 10A according to the first embodiment detects an open failure of the air passage switching unit 12 due to a difference in the room temperature after the ventilation operation is stopped.

Specifically, when the control unit 14 detects a state in which the room temperature is out of the normal temperature range of the space of 100 in the store for a predetermined determination reference period or more while the ventilation operation is stopped, the control unit 14 causes an open failure. Judge that there is. For example, assuming that the normal temperature range is 15 ° C. or higher and lower than 30 ° C. and the determination reference period is 30 minutes, the control unit 14 detects that the indoor temperature is 30 ° C. or higher for 30 minutes or longer. If this is the case, or if it is detected that the room temperature is less than 15 ° C for 30 minutes or more, it is determined that an open failure has occurred. Further, when the control unit 14 detects a state in which the room temperature is within the normal temperature range of the space of the store 100 communicating with the cooking room 101 while the ventilation operation is stopped, the control unit 14 determines that the failure is not open. For example, when the control unit 14 detects a state in which the room temperature is 15 ° C. or higher and lower than 30 ° C., which is the normal temperature range, it is determined that no open failure has occurred. The normal temperature range corresponds to the reference information.

The normal temperature range may be provided with means that can be changed for each season. For example, the normal temperature range of 20 ° C. or higher and lower than 30 ° C. in summer and 15 ° C. or higher and lower than 25 ° C. is specified in the control unit 14 of the ventilation device 10A or the ventilation device 10A (not shown). It may be possible to switch with the function setting switch. This makes it possible to narrow the normal temperature range and make it easier to detect failures.

Further, the normal temperature range may be set according to the set temperature of the air conditioner installed in the space communicating with the cooking room 101. Specifically, the ventilation device 10A receives the set temperature of the air conditioner installed in the space communicating with the cooking room 101 by communication or the like, and a predetermined numerical value is set with respect to the received set temperature of the air conditioner. The range calculated using may be the normal temperature range. In one example, the range of the set temperature ± 5 ° C. of the air conditioner is set as the normal temperature range. As a result, even if the set temperature of the air conditioner is appropriately changed according to the season, the weather, or the like, it is possible to suppress the occurrence of false detection of the open failure and detect the open failure more accurately.

Further, the time for determining the failure may be appropriately changed. Specifically, in the above example, in the case of a closed failure, the closed failure determination reference value for the set temperature decrease time is set to 20 minutes, and in the case of an open failure, the determination reference period is set to 30 minutes. However, it is not limited to this.

In both cases of closed failure and open failure, the threshold time for determining the failure is the speed of air convection between the cooking room 101 and the space communicating with the cooking room 101, that is, the air is mixed. Time to affect. Therefore, the threshold value of the time for determining the failure may be changed depending on the driving state of the ventilation device other than the ventilation device 10A. For example, when the driving state of the air supply fan, which is a ventilation fan that introduces air from the outside to the room by another ventilation device other than the ventilation device 10A, is in operation, the air supply fan other than the ventilation device 10A is upstream. Convection is promoted because the airflow is generated. Further, in the case of an exhaust fan in which the ventilation device 10A other than the ventilation device 10A is a ventilation fan that introduces air from the room to the outside, convection is promoted because an air flow is generated in the exhaust fan other than the ventilation device 10A. To. As described above, the convection of air between the cooking room 101 and the space communicating with the cooking room 101 is promoted. That is, when the driving state of the ventilation device other than the ventilation device 10A is in operation, the determination reference value and the determination reference period of the set temperature decrease time can be set short. This makes it possible to detect a failure faster. On the contrary, when the driving state of the ventilation device other than the ventilation device 10A is stopped, the convection of air between the cooking room 101 and the space communicating with the cooking room 101 is not promoted. It is desirable to set a long judgment reference value and judgment reference period for the set temperature decrease time. This makes it possible to suppress erroneous detection of failure of the air passage switching unit 12. In the above description, only whether the ventilation device other than the ventilation device 10A is in operation or stopped is determined as the driving state, but the number of ventilation devices other than the ventilation device 10A or the ventilation air volume is determined. The threshold value may be changed by.

As described above, the ventilation device 10A according to the first embodiment includes a fan 23 having a fan 25 and a fan driving unit 24 for driving the fan 25, an air passage switching unit 12, a temperature sensor 13A which is an environment sensor, and a fan. A control unit 14 for controlling the operation of the drive unit 24 and the air passage switching unit 12 is provided. The control unit 14 uses the control state of the air passage switching unit 12, the data of the air quality index indicating the properties of the air detected by the temperature sensor 13A, and the reference information for determining that the air passage switching unit 12 is out of order. Based on this, it is determined whether or not a failure has occurred in the air passage switching unit 12. Specifically, the control unit 14 detects a failure of the air passage switching unit 12 by using the detection information of the temperature sensor 13A indicating the indoor temperature of the ventilation target space during the ventilation operation and after the ventilation operation is stopped. As a result, even if the system cannot control or detect the rotation speed or motor current of the blower 23, if the temperature sensor 13A is provided, it is necessary to add a dedicated component for the purpose of detecting the failure of the air passage switching unit 12. Therefore, it is possible to reduce the development cost of the ventilation device 10A.

Further, in Patent Document 1, the failure of the air passage switching portion could not be detected while the blower is stopped, but in the ventilation device 10A according to the first embodiment, the temperature sensor 13A is detected even when the blower 23 is stopped. From the information, it is possible to detect the occurrence of an open failure of the air passage switching unit 12.

In addition, in order to provide a communication means for the ventilation device 10A to communicate with an exhaust device which is another ventilation device for discharging indoor air to the outside, and to make the room negative pressure when the ventilation device 10A is stopped. May be instructed to increase the exhaust air volume to other exhaust devices. This makes it possible to determine the open failure more quickly and accurately.

Embodiment 2.
FIG. 8 is a diagram schematically showing an example of the configuration of the ventilation device according to the second embodiment. The same components as those in the first embodiment are designated by the same reference numerals, the description thereof will be omitted, and the parts different from those in the first embodiment will be described. The ventilation device 10B according to the second embodiment includes a gas sensor 13B, which is a kind of environmental sensor for detecting a predetermined gas concentration in the air flow, instead of the temperature sensor 13A. The gas sensor 13B detects the gas concentration in the room where the ventilation device 10B is provided, and outputs the gas concentration data as a result of the detection to the control unit 14. The fan 25 is an exhaust fan that forms an air flow that causes air on the indoor side to flow to the outdoor side by rotation. The ventilator 10B is used for discharging indoor air to the outside. In the second embodiment, an algorithm is described in which the control unit 14 determines the failure of the air passage switching unit 12, that is, the closed failure or the open failure, by using the detection information of the gas sensor 13B.

FIG. 9 is a block diagram schematically showing an example of a main functional configuration of the control unit of the ventilation device according to the second embodiment. The control unit 14 detects gas using data from the fan drive control unit 221 that controls the operation of the fan drive unit 24, the air passage switching control unit 222 that controls the operation of the air passage switching unit 12, and the gas sensor 13B. A gas detection unit 223 for performing the above operation, a failure determination unit 224 for determining a failure of the air passage switching unit 12, and a control manager 225 for comprehensively controlling the operation of each processing unit.

The control manager 225 controls so that the operation of the fan 25 and the open / closed state of the air passage switching unit 12 are interlocked with each other. Further, the control manager 225 can acquire the air pollution detection value detected by the gas sensor 13B in the gas detection unit 223. The gas sensor 13B used in the second embodiment has a characteristic that the electric resistance value changes according to the degree of pollution of the air in the room. It is assumed that the DC voltage value, which is an air quality index detected by the control manager 225, changes in the range of 0V to 10V by changing the electric resistance value of the gas sensor 13B according to the degree of contamination of the indoor air. It is assumed that the lower the input voltage by the gas sensor 13B is, the lower the degree of air pollution is, and the higher the input voltage by the gas sensor 13B is, the higher the degree of air pollution is.

The control manager 225 controls the start and stop of the ventilation operation according to the input voltage of the gas sensor 13B. Specifically, the control manager 225 operates the fan 25 and opens the air passage switching unit 12 when the input voltage of the gas sensor 13B becomes equal to or higher than the operation start set voltage which is the voltage for starting the ventilation operation. , The fan drive control unit 221 and the air passage switching control unit 222 are controlled. The control manager 225 stops the fan 25 and closes the air passage switching unit 12 when the input voltage of the gas sensor 13B becomes equal to or lower than the operation stop set voltage which is the voltage for stopping the ventilation operation. It controls 221 and the air passage switching control unit 222. Since the open / closed state of the air passage switching unit 12 is the same as that shown in FIGS. 2 and 3 of the first embodiment, the description thereof will be omitted.

Further, the control manager 225 can have the failure determination unit 224 determine the presence or absence of a failure in the air passage switching unit 12 of the ventilation device 10B, and can acquire the determination result in the failure determination unit 224.

10 and 11 are diagrams illustrating an example of a normal operating state of the ventilation device according to the second embodiment. FIG. 10 shows a state in which the ventilation operation is stopped, and FIG. 11 shows a state in which the ventilation operation is in progress. As shown in FIGS. 10 and 11, the ventilation device 10B is installed on the wall surface of the smoking room 201 which is a ventilation target space, and the air supply port 204 is provided on the wall 203 between the smoking room 201 and the corridor 202. It is provided.

As shown in FIG. 10, when the ventilation operation is stopped, the air passage switching unit 12 is closed. Therefore, the air movement path is the air path 211 in which the air in the smoking room 201 and the air in the corridor 202 come and go through the air supply port 204.

On the other hand, as shown in FIG. 11, when the ventilation device 10B is in operation, the air passage switching unit 12 is in the open state. Therefore, the air movement path is the air path 212 in which the air flows into the smoking room 201 from the corridor 202 through the air supply port 204, and the air in the smoking room 201 is discharged to the outside through the ventilation device 10B. It becomes the air path 213.

FIG. 12 is a diagram showing an example of an air path when the ventilation device according to the second embodiment has a closed failure. If the air passage switching unit 12 fails to close, the air in the smoking room 201 cannot be discharged to the outside of the room. Therefore, the air flow is shown in FIG. 10 regardless of whether the ventilation device 10B is in the ventilation operation or stopped. Will be the same as. That is, in the air path 211, the air in the smoking room 201 and the air in the corridor 202 come and go through the air supply port 204.

FIG. 13 is a diagram showing an example of an air flow path when the ventilation device according to the second embodiment fails to open. When the air passage switching unit 12 fails to open, the smoking room 201 is connected to the outside via the ventilation device 10B, and is continuously connected to the corridor 202 via the air supply port 204. Therefore, when the ventilation operation is stopped, the outdoor air flows into the smoking room 201. When the ventilation device 10B is operated, the air path is the same as that in FIG.

FIG. 14 is a diagram for explaining an example of ventilation control using a gas sensor when the ventilation device according to the second embodiment is normal. 14 shows a graph B1 showing a change in the input voltage of the gas sensor 13B of the smoking room 201, a graph B2 showing the operating state of the ventilation device 10B in the smoking room 201, and a graph B3 showing the smoking situation in the smoking room 201. , Is shown. In FIG. 14, the horizontal axis indicates time, and indicates the elapsed time from a certain time as a reference. Here, the point where the horizontal axis intersects the vertical axis is used as a reference. The vertical axis of the graph B1 shows the input voltage of the gas sensor 13B.

In graph B1, the steady value which is the input voltage of the gas sensor 13B while the ventilation operation is stopped is set to 3V, the operation start set voltage, that is, the determination value when the air condition is dirty is set to 7V, and the operation stop setting voltage, that is, air. The description will be given assuming that the determination value when the state is clean is 4V.

First, the input voltage of the gas sensor 13B is monitored with the ventilation operation stopped. In the example of FIG. 14, the input voltage of the gas sensor 13B is continuously monitored from 0 to 10 minutes. Then, as shown in the graph B3, at the point A, when the smoking room 201 is smoking, the air in the room begins to be polluted, and the input voltage of the gas sensor 13B rises. After that, when the input voltage of the gas sensor 13B reaches 7V, which is the operation start set voltage, at the point B, the control manager 225 determines that the air condition in the smoking room 201 is dirty. Then, as shown in the graph B2, the control manager 225 interlocks the fan drive control unit 221 and the air passage switching control unit 222 with the fan drive unit 24 and the air passage so that the inside of the smoking room 201 is exhausted. The switching unit 12 is driven to perform ventilation operation.

When the ventilation device 10B starts operation at the point B, the dirty air in the room is discharged to the outside, so that the dirt in the air state is gradually removed. As a result, the input voltage of the gas sensor 13B gradually decreases. After that, as shown in Graph B3, even after the use of the smoking room 201 is finished at the point C, the dirty air in the room is continuously discharged. When the control manager 225 detects that the input voltage of the gas sensor 13B has decreased to 4V, which is the operation stop setting voltage, at the point D, the control manager 225 does not stop the ventilation operation but additionally for a predetermined period of time. The switching unit 12 is opened, and the residual delay operation is performed to continue the state in which the fan drive unit 24 is operated. An example of the period of late operation is 20 minutes.

Due to the late operation, air continuously flows into the room from the communicating space, and during the late operation, the input voltage of the gas sensor 13B is the state before the start of use of the smoking room 201, in the case of FIG. , Settles down to about 3V. The above is the outline of the control of the ventilation operation using the gas sensor 13B, and the control is repeated thereafter.

FIG. 15 is a diagram showing an example of a control procedure for detecting a closing failure using a gas sensor in the ventilation device according to the second embodiment. FIG. 15 shows a graph B1 showing a change in the input voltage of the gas sensor 13B of the smoking room 201, a graph B2 showing the operating state of the ventilation device 10B in the smoking room 201, and a graph B3 showing the smoking situation in the smoking room 201. And the graph B4 showing the state of the air passage switching unit 12. In FIG. 15, the horizontal axis indicates time, and indicates the elapsed time from a certain time as a reference. The vertical axis of the graph B1 shows the input voltage of the gas sensor 13B. In the following, it is assumed that the operation start set voltage is 7 V and the operation stop set voltage is 4 V.

Similar to the content shown in FIG. 14, as shown in the graph B3, when the smoking room 201 is smoking at the point A, the air in the room starts to be polluted and the input voltage of the gas sensor 13B rises. After that, when the input voltage of the gas sensor 13B reaches 7V, which is the operation start set voltage, at the point B, the control manager 225 determines that the air condition in the smoking room 201 is dirty, as shown in the graph B2. , Start ventilation operation.

As shown in FIG. 12, when the air passage switching unit 12 is closed, the air cannot be discharged from the smoking room 201 to the outside, so that there is no effect of removing the dirt of the indoor air by the ventilation operation, and the gas sensor. The input voltage of 13B continues to rise. That is, when the input voltage of the gas sensor 13B reaches 9V, which is the closing failure detection threshold value that is the criterion for determining that an abnormality of the closing failure has occurred at the point E, the failure determination unit 224 is shown in the graph B4. , Detects a closing failure of the air passage switching unit 12. The closed failure detection threshold is an example of reference information. The input voltage of the gas sensor 13B becomes the highest near the point F where the indoor smoking ends, and after that, the air in the smoking room 201 is convoluted by the convection between the air in the smoking room 201 and the air in the corridor 202 through the air supply port 204. The dirt spreads and the input voltage of the gas sensor 13B gradually decreases. In addition, in FIG. 15, as shown in graph B2, the ventilation operation is continued even after the closing failure of the air passage switching unit 12 is determined at the point E, but the operation after the closing failure is determined. Is not particularly limited. For example, the ventilation operation may be stopped and the user of the smoking room 201 may be notified to recognize the abnormality detection in the ventilation device 10B.

FIG. 16 is a diagram showing an example of a control procedure for detecting an open failure using a gas sensor in the ventilation device according to the second embodiment. FIG. 16 shows a graph B1 showing a change in the input voltage of the gas sensor 13B of the smoking room 201, a graph B2 showing the operating state of the ventilation device 10B in the smoking room 201, and a graph B3 showing the smoking situation in the smoking room 201. And the graph B4 showing the state of the air passage switching unit 12. In FIG. 16, the horizontal axis indicates time, and indicates the elapsed time from a certain time as a reference. The vertical axis of the graph B1 shows the input voltage of the gas sensor 13B. In the following, it is assumed that the operation start set voltage is 7 V and the operation stop set voltage is 4 V.

Similar to the content shown in FIG. 14, as shown in the graph B3, when the smoking room 201 is smoking at the point A, the air in the room starts to be polluted and the input voltage of the gas sensor 13B rises. After that, when the input voltage of the gas sensor 13B reaches 7V, which is the operation start voltage, at the point B, the control manager 225 determines that the air condition in the smoking room 201 is dirty, as shown in the graph B2. Start ventilation operation.

When the ventilation operation is started at the point B, the dirty air in the room is discharged to the outside, so that the dirt in the air state is gradually removed. As a result, the input voltage of the gas sensor 13B gradually decreases. After that, at point C, even after the use of the smoking room 201 is finished, the dirty air in the room continues to be discharged. When it is detected at point D that the input voltage of the gas sensor 13B has decreased to 4V, which is the operation stop setting voltage, the control manager 225 additionally executes the residual delay operation. An example of the period of late operation is 20 minutes. Due to the late operation, air continuously flows into the smoking room 201 from the communicating space, and at the point G where the late operation ends, the input voltage of the gas sensor 13B is the state before the start of use of the smoking room 201. In the case of 16, it becomes about 3V.

Here, as shown in FIG. 13, when the air passage switching unit 12 is open and malfunctions, the smoking room 201 is connected to the outside via the ventilation device 10B and to the corridor 202 via the air supply port 204, respectively. The state is continued. That is, air is exchanged between the smoking room 201 and the outside, and between the smoking room 201 and the corridor 202. Focusing on the fact that the degree of air pollution in the outdoor area and the corridor 202 with respect to the smoking room 201 is relatively low, as shown after point G in FIG. 16, the air pollution in the smoking room 201 is gradually reduced. Will be done. An example of the time at point G is 46 minutes. Therefore, at point H, the failure determination unit 224 reduces the input voltage of the gas sensor 13B to 2V, which is the open failure detection threshold that serves as a reference for the occurrence of open failure while the ventilation operation is stopped. As shown in B4, the open failure of the air passage switching unit 12 can be detected. The open failure detection threshold is an example of reference information. When the failure determination unit 224 detects an open failure of the air passage switching unit 12 at the point H, the ventilation operation is performed as shown in graph B2 in FIG. This is because if the ventilation device 10B is continuously stopped, the dirty air of the smoking room 201 will flow into the corridor 202. Therefore, by performing the ventilation operation, the dirty air will be suppressed from flowing into the corridor 202. Is. However, the operation of the ventilation device 10B when an open failure is detected is not limited to this.

FIG. 17 is a flowchart showing an example of a failure detection method of the air passage switching portion in the ventilation device according to the second embodiment. By modularizing this flowchart, it can be executed together with other failure detection processes in the failure determination unit 224. For example, the failure detection method shown in FIG. 17 can be executed every cycle of the main loop of the software mounted on the ventilation device 10B.

First, the failure determination unit 224 determines whether the input voltage of the gas sensor 13B is equal to or higher than the closed failure detection threshold value (step S11). In one example, the closed failure detection threshold can be 8.5V. When the input voltage of the gas sensor 13B is equal to or higher than the closed failure detection threshold value (Yes in step S11), the failure determination unit 224 determines that the air passage switching unit 12 has a closed failure (step S12), and processes the process. Is finished.

When the input voltage of the gas sensor 13B is not equal to or higher than the closed failure detection threshold value (No in step S11), the failure determination unit 224 determines whether the input voltage of the gas sensor 13B is equal to or lower than the open failure detection threshold value. (Step S13). In one example, the open failure detection threshold can be 2.5V. When the input voltage of the gas sensor 13B is equal to or less than the open failure detection threshold value (Yes in step S13), the failure determination unit 224 determines that the air passage switching unit 12 has an open failure (step S14), and processes the process. Is finished. Further, when the input voltage of the gas sensor 13B is not equal to or less than the open failure detection threshold value (No in step S13), the failure determination unit 224 determines that the air passage switching unit 12 is not in the failure state, and performs special processing. The process ends without being done.

In this example, the case where the closed failure detection threshold value is 8.5V and the open failure detection threshold value is 2.5V is shown, but the closed failure detection threshold value and the open failure detection threshold value may be appropriately changed. For example, when the number of smokers is smaller than the size of the smoking room 201, the amount of air discharged is less polluted and the input voltage of the gas sensor 13B is also reduced. Therefore, by setting the closed failure detection threshold value low, it is possible to detect the failure earlier. Further, in the case of an area where the outside air is relatively dirty, such as when the outdoors are along a highway, it is possible to detect the failure earlier by setting the open failure detection threshold value high.

The ventilation device 10B according to the second embodiment includes a blower 23 having a fan 25 and a fan drive unit 24 for driving the fan 25, an air passage switching unit 12, a gas sensor 13B, a fan drive unit 24, and an air passage switching unit 12. A control unit 14 for controlling the operation is provided. The control unit 14 detects a failure of the air passage switching unit 12 by using the detection information of the gas sensor 13B acquired from the gas sensor 13B regarding the air pollution in the ventilation target space during the ventilation operation and after the ventilation operation is stopped. As a result, even if the system cannot control or detect the rotation speed or motor current of the blower 23, if the gas sensor 13B is provided, it is necessary to add a dedicated component for the purpose of detecting the failure of the air passage switching unit 12. Since it is eliminated, the development cost can be reduced.

Further, in Patent Document 1, the failure of the air passage switching unit could not be detected while the blower is stopped, but in the ventilation device 10B according to the second embodiment, the air passage is switched from the detection information of the gas sensor 13B even when the blower 23 is stopped. It is possible to detect an open failure of the unit 12.

Embodiment 3.
FIG. 18 is a diagram schematically showing an example of the configuration of the ventilation device according to the third embodiment. The same components as those in the first embodiment are designated by the same reference numerals, the description thereof will be omitted, and the parts different from those in the first embodiment will be described. The ventilation device 10C according to the third embodiment includes a humidity sensor 13C which is a kind of environment sensor for detecting the humidity of the ventilation target space instead of the temperature sensor 13A. The humidity sensor 13C detects the humidity in the room where the ventilation device 10C is provided, and outputs the humidity data as a result of the detection to the control unit 14. An example of the ventilator 10C is a pipe fan. The pipe fan is arranged by the mounted humidity sensor 13C in an environment where the humidity tends to be temporarily high, such as a place where a washbasin with a shower is located or a room where laundry is dried indoors. The ventilation device 10C starts the operation when the relative humidity in the room exceeds the operation start set humidity, which is the humidity at which the ventilation operation is started, and the operation stop set humidity, which is the humidity at which the relative humidity in the room stops the ventilation operation. If it falls below the limit, the operation will be stopped. In the following, the relative humidity in the room is referred to as the indoor humidity. Further, the air passage switching unit 12 mounted on the ventilation device 10C is used to prevent dirty outside air, cold air intrusion in winter, and wind leakage during strong wind, and to maintain a comfortable indoor space. FIG. 18 shows the case where the ventilation device 10C is provided on the wall of the washroom 301.

In FIG. 18, the ventilation device 10C opens the air passage switching unit 12 during ventilation operation, guides air from the washroom 301, which is the ventilation target space, along the airflow direction 311, and closes the air passage switching unit 12 when stopped. , Block the flow of air. Since the open / closed state of the air passage switching portion 12 of the ventilation device 10C according to the third embodiment is the same as that shown in FIGS. 2 and 3 of the first embodiment, the description thereof will be omitted.

If the ventilation operation is stopped with the air passage switching unit 12 open and failed, the outdoor air flows into the washroom 301 along the airflow direction 312. In particular, in a house with type 3 ventilation, which is a ventilation system in which exhaust is forcibly performed by mechanical ventilation and air is supplied naturally from the air supply port, the indoor air becomes negative pressure, so the outdoor air is more in the washroom. It becomes easy to flow into 301. Further, when the ventilation device 10C is operated with the air passage switching unit 12 closed and failed, the high humidity air in the washroom 301 cannot be guided to the outside along the airflow direction 311.

The control unit 14 of the ventilation device 10C according to the third embodiment acquires the indoor humidity, which is an example of the air quality index, from the humidity sensor 13C, and controls the start and stop of the ventilation operation according to the indoor humidity. Specifically, the control unit 14 starts the ventilation operation when the indoor humidity becomes equal to or higher than the operation start set humidity, which is the humidity at which the ventilation operation is started, and the indoor humidity is the humidity at which the ventilation operation is stopped. Ventilation operation is stopped when the humidity drops below the stop humidity.

Next, a method of detecting the failure of the air passage switching unit 12 by the control unit 14 will be described with reference to specific examples. Here, as shown in FIG. 18, a case where the ventilation device 10C is provided in the washroom 301 will be taken as an example.

FIG. 19 is a diagram for explaining an example of normal ventilation control using a humidity sensor in the ventilation device according to the third embodiment. FIG. 19 shows a graph C1 showing a change in indoor humidity of a washroom 301 having a washbasin with a shower, a graph C2 showing the usage status of a shower in the washroom 301, and a graph C3 showing the operating status of the ventilation device 10C. ,It is shown. In FIG. 19, the horizontal axis indicates time, and indicates the elapsed time from a certain time as a reference. Here, the point where the horizontal axis intersects the vertical axis is used as a reference. The vertical axis of the graph C1 shows the indoor humidity, which is the relative humidity in the room. Graph C1 shows the transition of the indoor humidity data acquired from the humidity sensor 13C when the ventilation device 10C starts the operation in the washroom 301 before and after the shower is used in the normal state of the air passage switching unit 12. .. In the following, it is assumed that the operation start set humidity is 80% and the operation stop set temperature is 70%.

First, at the time T31 before starting to use the shower, the indoor humidity is almost stable at about 50%. At this time, the air passage switching unit 12 of the ventilation device 10C is in the closed state, and the fan drive unit 24 is in the stopped state. In one example, time T31 is between 0 and 4 minutes.

Then, as shown in graph C2, the use of the shower is started at time T32. When the use of the shower is started, the indoor humidity rises due to the generation of steam due to the use of the shower. In one example, the time T32 is 4 minutes.

When the indoor humidity rises and the indoor humidity reaches 80% or more of the operation start set humidity at time T33, the control unit 14 starts the ventilation operation as shown in the graph C3. That is, the control unit 14 rotates the fan 25 by opening the air passage switching unit 12 and operating the fan drive unit 24. As a result, the high-humidity air in the washroom 301 is discharged to the outside. In one example, the time T33 is 5 minutes.

After that, the indoor humidity rises, and at time T34, the indoor humidity rises to nearly 100%. In one example, the time T34 is 6 minutes. While using the shower, in the example of FIG. 19, for a period of 6 to 10 minutes, the indoor humidity is maintained from 90% to 100% due to the influence of the steam generated intermittently.

After that, as shown in Graph C2, when the use of the shower ends at time T35, the indoor humidity begins to gradually decrease. At time T36, when the generation of steam has subsided and the indoor humidity has begun to fall and the indoor humidity has fallen below 90%, the control unit 14 determines that the use of the shower has been stopped. In this specification, the indoor humidity of 90% is the humidity at which the use of the shower is determined to be stopped. In other words, when the indoor humidity is 90% or more, the control unit 14 determines that steam is intermittently generated because the shower is in use. In one example, the time T35 is 10 minutes and the time T36 is 11 minutes.

When the indoor humidity further drops and it is detected at time T37 that the indoor humidity is equal to or lower than the operation stop set humidity, the control unit 14 performs the residual delay operation instead of stopping the ventilation operation. An example of the period of late operation is 10 minutes. Due to the late operation, air continuously flows into the washroom 301 from the communicating space, and the indoor humidity is the state before the start of use of the shower during the late operation, in FIG. 19. It will settle down to about 50%. The period from the time T36 when it is determined that the use of the shower is stopped to the time T37 when the indoor humidity becomes equal to or lower than the operation stop set humidity is assumed to be ΔTc. In one example, the time T36 is 11 minutes, the time T37 is 13 minutes, and ΔTc at this time is 2 minutes.

After that, as shown in the graph C3, the control unit 14 stops the ventilation operation at the time T38 at the timing when the residual delay operation ends. That is, the control unit 14 closes the air passage switching unit 12 and stops the operation of the fan drive unit 24. As a result, the air in the washroom 301 is exhausted to the outside, and the airflow from the room to the outside generated by the ventilation operation is eliminated, but the space between the washroom 301 and the space communicating with the washroom 301 is eliminated. Due to the convection of air, the indoor humidity gradually drops, and finally it settles down at a humidity close to the indoor humidity before starting to use the shower. In one example, the time T38 is 23 minutes.

In addition, during the period of residual late operation, in the state before starting to use the shower, in FIG. 19, even if the indoor humidity does not drop to about 50%, it communicates with the washroom 301 and the washroom 301. Due to the convection of air to and from the space in which the shower is located, the indoor humidity will gradually decrease, and eventually it will settle near the indoor humidity before the start of use of the shower.

Further, FIG. 19 shows a case where the indoor humidity before starting the use of the shower is about 50%, which is an example. Therefore, in reality, the stable indoor humidity differs depending on the season, the weather, the operating state of the air conditioner in the space communicating with the washroom 301, and the like.

Next, the difference between the change in indoor humidity and the change in outdoor humidity will be supplementarily explained. In today's highly airtight and highly insulated houses, the indoor temperature and humidity are not easily affected by the outdoor weather and changes in temperature and humidity throughout the day, so the indoor temperature is compared to the outdoor temperature and humidity changes. Changes and humidity changes are small.

FIG. 20 is a diagram showing an example of the relationship between indoor humidity and outdoor humidity in a room provided with a ventilation device according to the third embodiment. In FIG. 20, the horizontal axis indicates time, the vertical axis on the left side indicates relative humidity (%), and the vertical axis on the right side indicates temperature (° C.). Here, the weather data of the end of May in Tokyo and the change in the indoor humidity when the air passage switching unit 12 of the ventilation device 10C is normal are shown. The solid line in the figure indicates the outdoor relative humidity (%), which is one of the meteorological data, the alternate long and short dash line indicates the outside air temperature (° C), which is one of the meteorological data, and the dotted line indicates the air passage switching unit 12. Shows the normal indoor relative humidity (%). In the following, in order to explain the difference regarding the temperature change between indoors and outdoors, the shower is not used in the washroom 301, the ventilation device 10C continues to be stopped, in other words, the air passage switching unit 12 is closed. Will be described when the above is continued.

As shown in FIG. 20, the outdoor relative humidity on a sunny day fluctuates greatly with fluctuations in the outside air temperature, and the fluctuation range, which is the difference between the maximum and minimum values of the outdoor relative humidity in a day, is approximately 50%. That's it. On the other hand, on a rainy day, the outdoor relative humidity is close to 100% throughout the day, and the fluctuation range of the outdoor relative humidity in the day is almost eliminated.

In recent highly airtight and highly insulated houses, the indoor relative humidity is not easily affected by fluctuations in the outside air temperature regardless of the season and weather, and the indoor temperature change and the indoor humidity change are small. In addition, in a house where air conditioning is controlled so that the temperature and humidity are constant by air conditioning in the entire building in order to keep the indoor environment constant, the fluctuation range becomes smaller.

FIG. 21 is a diagram showing an example of changes in indoor humidity when the air passage switching portion of the ventilation device according to the third embodiment is closed. FIG. 21 shows a graph C1 showing a change in the indoor humidity of the washroom 301, a graph C2 showing the usage status of the shower in the washroom 301, and a graph C3 showing the operating status of the ventilation device 10C. .. In FIG. 21, the horizontal axis indicates time, and indicates the elapsed time from a certain time as a reference. Here, the point where the horizontal axis intersects the vertical axis is used as a reference. The vertical axis of the graph C1 shows the indoor humidity, which is the relative humidity in the room. Graph C1 shows the transition of the indoor humidity data acquired from the humidity sensor 13C when a closing failure of the air passage switching unit 12 occurs at the timing of starting the ventilation operation in the washroom 301 before and after the shower is used. In the following, it is assumed that the operation start set humidity is 80% and the operation stop set temperature is 70%.

The times T31 to T35 in FIG. 21 indicate the same times as the times T31 to T35 in FIG. The changes in indoor humidity, the shower usage status, and the operating status of the ventilation device 10C during the period from the time T31 before the start of shower use to the time T35 when the shower usage ends are as shown in FIGS. 19 from time T31 to T35. Since it is the same, the description thereof will be omitted. However, since the closing failure occurred at time T32, the air passage switching unit 12 was closed, and the high-humidity air in the washroom 301 was not discharged to the outside.

After time T35, although the generation of steam due to the use of the shower has subsided, the high-humidity air in the washroom 301 cannot be discharged to the outside. Therefore, in the case of FIG. 21, 90% of the humidity at which the shower is stopped cannot be detected even at the time T36 when one minute has passed since the shower was stopped.

Further, when the air passage switching unit 12 fails to close, the high-humidity air in the washroom 301 cannot be discharged to the outside of the room, so that the space communicating with the washroom 301 and the washroom 301 is used. Due to the convection of air between them, the indoor humidity of the washroom 301 gradually decreases. However, the rate of decrease in the indoor humidity of the washroom 301 is slower than that in FIG. 19 when the air passage switching unit 12 is normal. Therefore, in FIG. 19, 70% of the operation stop set humidity has already been reached at time T37, but in the case of FIG. 10, 70% of the operation stop set humidity has not been reached at time T37.

Due to the diffusion of the air in the washroom 301 into the space communicating with the washroom 301, the indoor humidity of the washroom 301 will continue to gradually decrease. As a result, at time T39, the indoor humidity becomes 90% or less, which is the humidity at which the shower is stopped. In one example, the time T39 is 17 minutes. More specifically, the humidity at which the shower is stopped is detected 7 minutes after the time T35 when the shower is actually stopped, which is compared with 1 minute when the air passage switching unit 12 in FIG. 19 is normal. Therefore, the detection is significantly delayed from the actual suspension of use of the shower. The control unit 14 recognizes that the shower is being used during the period from the time T35 when the shower is actually stopped to the time T37 when the humidity at which the shower is stopped is detected.

Similarly, after that, the indoor humidity of the washroom 301 continues to gradually decrease, and finally at time T40, the humidity becomes 70% or less of the set humidity at which the operation is stopped. In one example, the time T40 is 47 minutes. Assuming that the period from the time T39 when it is determined that the use of the shower is stopped to the time T40 when the indoor humidity becomes equal to or less than the operation stop set humidity is ΔTd, in the case of FIG. 21, ΔTd is 30 minutes. At time T40, the control unit 14 starts the 10-minute residual delay operation.

Similarly, during the 10-minute residual / delayed operation, the indoor humidity of the washroom 301 continues to gradually decrease, and at the time T41 when the residual / delayed operation ends, the control unit 14 is in the ventilation operation as shown in the graph C3. To stop. In one example, the time T41 is 57 minutes. However, in the case of FIG. 21, at time T41, the humidity before starting to use the shower, in this case, does not drop to 50%.

Comparing FIGS. 19 and 21, the time from the time when the shower stop humidity, which is the first value of the indoor humidity, is detected to the time when the operation stop set humidity, which is the second value, is detected, is the air passage of FIG. When the switching unit 12 is normal, ΔTc = 2 minutes, but when the air passage switching unit 12 in FIG. 21 is closed, ΔTd = 30 minutes, which are significantly different between the two. Therefore, the control unit 14 of the ventilation device 10C according to the third embodiment detects a closing failure of the air passage switching unit 12 due to the above time difference.

Specifically, the control unit 14 has a set humidity drop time, which is the time from the time when the shower stop humidity is detected to the time when the operation stop set humidity is detected, and a closed failure determination standard, which is a reference for the occurrence of a closed failure. Compare with the value. Here, the set humidity decrease time corresponds to the change time, and the closed failure determination reference value corresponds to the reference information. In one example, the closed failure determination reference value can be 20 minutes. The control unit 14 determines that a closed failure has occurred when the set humidity decrease time is larger than the closed failure determination reference value, and when the set humidity decrease time is smaller than the closed failure determination reference value, the control unit 14 determines that a closed failure has occurred. It is determined that no closing failure has occurred. If the set humidity decrease time is equal to the closed failure determination reference value, it may be determined that a closed failure has occurred, or it may be determined that a closed failure has not occurred.

Next, a method for detecting an open failure will be described. FIG. 22 is a diagram showing an example of the relationship between the room humidity at the time of normal operation and the time of opening failure in the room where the ventilation device according to the third embodiment is provided. In FIG. 22, the horizontal axis indicates time, the vertical axis on the left side indicates relative humidity (%), and the vertical axis on the right side indicates temperature (° C.). Here, the weather data of the end of May in Tokyo and the change in the indoor humidity when the air passage switching unit 12 of the ventilation device 10C is normal and when the air passage switching unit 12 is open or failed are shown. The solid line in the figure indicates the outdoor relative humidity (%), which is one of the meteorological data, the one-point chain line indicates the outside temperature (° C), which is one of the meteorological data, and the two-point chain line is the air passage switching section. 12 indicates the indoor relative humidity (%) when the air passage switching unit 12 is open, and the dotted line indicates the indoor relative humidity (%) when the air passage switching unit 12 is open. That is, FIG. 22 shows the transition of the indoor relative humidity at the time of opening failure added to FIG. 20. In the description of FIG. 22, it is assumed that the shower is not used in the washroom 301 in order to explain the difference in humidity change between indoors and outdoors.

At the time of opening failure, since the air passage switching unit 12 is in an open state, outside air enters the room from the outside through the air passage switching unit 12. Therefore, on a sunny day, the indoor humidity at the time of opening failure will roughly follow the outdoor humidity.

In a highly airtight and highly insulated house these days, the indoor humidity does not fluctuate significantly. Therefore, the ventilation device 10C determines whether the indoor humidity while the ventilation device 10C is stopped is within the normal range. It becomes possible to detect the open failure of.

Specifically, when the control unit 14 detects a state in which the indoor humidity is out of the normal humidity range of the space communicating with the washroom 301 for a predetermined determination reference period or longer while the ventilation operation is stopped, the control unit 14 detects. Judged as an open failure. For example, assuming that the normal humidity range is 35% or more and less than 70% ° C. and the determination reference period is 30 minutes, the control unit 14 determines that the indoor humidity is less than 35% for 30 minutes or more. When it is detected, or when it is detected that the indoor humidity is 70% or more continuously for 30 minutes or more, it is determined that an open failure has occurred. Further, when the control unit 14 detects a state in which the indoor humidity is within the normal humidity range of the space communicating with the washroom 301 while the ventilation operation is stopped, the control unit 14 determines that the failure is not open. For example, when the control unit 14 detects that the indoor humidity is 35% or more and less than 70%, which is the normal humidity range, for 30 minutes or more, it is determined that no open failure has occurred. .. The normal humidity range corresponds to the reference information.

Further, in order to suppress false detection of failure, the control unit 14 continuously detects a state where the indoor humidity is less than 35% for 30 minutes or more and a state where the indoor humidity is 70% or more within 24 hours. May be determined that an open failure has occurred when the above is continuously detected for 30 minutes or more.

The normal humidity range may be provided with means that can be changed for each season. For example, the normal humidity range is specified to be 35% or more and less than 75% in the rainy season and 25% or more and less than 60% in the winter, which is not shown in the control unit 14 of the ventilation device 10C or the ventilation device 10C. It may be possible to switch with the function setting switch of. This makes it possible to narrow the normal humidity range and suppress the possibility of erroneous detection.

Further, the normal humidity range may be set according to the set humidity of the air conditioner installed in the space communicating with the washroom 301. Specifically, the ventilation device 10C receives the set humidity of the air conditioner installed in the space communicating with the washroom 301 by communication or the like, and a predetermined numerical value is set for the received set humidity of the air conditioner. The range calculated using may be the normal humidity range. In one example, the range of the set humidity ± 15% of the air conditioner is set as the normal humidity range. As a result, even if the set humidity of the air conditioner is appropriately changed according to the season or the weather, it is possible to suppress the false detection of the open failure and detect the open failure more accurately.

Further, the time for determining the failure may be appropriately changed. Specifically, in the above example, in the case of an open failure, the criterion period during which the indoor humidity while the ventilation operation is stopped is out of the normal humidity range is set to 30 minutes, but it is limited to this. It's not something.

The threshold time for determining a failure is affected by the speed of air convection between the washroom 301 and the space communicating with the washroom 301, that is, the time until the air is mixed. Therefore, the threshold value may be changed depending on the driving state of another ventilation device provided in the space communicating with the washroom 301 other than the ventilation device 10C. For example, when the driving state of the ventilation device other than the ventilation device 10C is in operation, and the ventilation device other than the ventilation device 10C is an air supply fan, the air supply fan other than the ventilation device 10C is used. Convection is promoted due to the generation of airflow upstream. Further, when the ventilation device other than the ventilation device 10C is an exhaust fan, an air flow is generated in which the exhaust fan other than the ventilation device 10C is downstream, so that convection is promoted. As described above, convection of air between the washroom 301 and the space communicating with the washroom 301 is promoted. That is, when the driving state of the ventilation device other than the ventilation device 10C is in operation, the determination reference value and the determination reference period of the set humidity decrease time can be set short. This makes it possible to detect a failure faster. On the contrary, when the driving state of the ventilation device other than the ventilation device 10C is stopped, the convection of air between the washroom 301 and the space communicating with the washroom 301 is not promoted. , It is desirable to set a long judgment reference value and judgment reference period for the set humidity drop time. This makes it possible to suppress erroneous detection of failure of the air passage switching unit 12. In the above description, only whether the ventilation device other than the ventilation device 10C is in operation or stopped is determined as the driving state, but the number of ventilation devices other than the ventilation device 10C or the ventilation air volume is determined. The threshold value may be changed by.

On the other hand, as shown in FIG. 22, on a rainy day, the outdoor relative humidity is close to 100% throughout the day. Therefore, if the air passage switching unit 12 is open and malfunctions, the air passage switching unit 12 High humidity outside air invades from the outside through the air, and the indoor humidity also rises. At this time, when the indoor humidity reaches 80% or more of the operation start set humidity, the ventilation device 10C starts the operation and tries to discharge the high humidity air in the washroom 301 to the outside. However, since the shower is not actually used and steam is not generated, the air in the space communicating with the washroom 301 immediately reaches the vicinity of the humidity sensor 13C in the room with the operation of the ventilation device 10C. However, the indoor humidity begins to decrease. When the indoor humidity starts to decrease and reaches 70% of the operation stop set humidity, the ventilation device 10C stops the operation. When the ventilation device 10C stops operating, high-humidity outside air enters the room again from the outside through the air passage switching unit 12. In this way, the ventilation device 10C operates when the indoor humidity detects 80% or more of the operation start set humidity, and stops when the indoor humidity detects 70% or less of the operation stop set humidity. Will repeat.

In general, a washbasin with a shower is not used several tens of times in a short time, so that the control unit 14 switches the air passage based on the number of operations of the ventilation device 10C in a predetermined period. It is possible to detect an open failure of the unit 12. Specifically, the control unit 14 determines that an open failure has occurred when the number of operations of the ventilation device 10C is equal to or greater than the predetermined number of first failure determinations within one hour. If the determination is made and the number of times of determination is less than the first failure determination, it may be determined that no open failure has occurred. An example of the number of times of the first failure determination can be 10 times. Further, in order to prevent erroneous detection of failure, if the number of operations of the ventilation device 10C is equal to or greater than the predetermined number of times of second failure determination within 24 hours, an open failure occurs. If it is determined to be present and the number of times of the second failure determination is less than the number of times, it may be determined that no open failure has occurred. An example of the second failure determination number of times can be 100 times. The first failure determination number and the second failure determination number are examples of reference information.

As described above, the ventilation device 10C according to the third embodiment includes the fan 25, the blower 23 having the fan drive unit 24 for driving the fan 25, the air passage switching unit 12, the humidity sensor 13C, the fan drive unit 24, and the fan drive unit 24. A control unit 14 for controlling the operation of the air passage switching unit 12 is provided. The control unit 14 detects a failure of the air passage switching unit 12 by using the detection information of the humidity sensor 13C indicating the indoor humidity of the ventilation target space during the ventilation operation and after the ventilation operation is stopped. As a result, even if the system cannot control or detect the rotation speed or motor current of the blower 23, if the humidity sensor 13C is provided, it is necessary to add a dedicated component for the purpose of detecting the failure of the air passage switching unit 12. It is possible to reduce the development cost because there is no such thing.

Further, in Patent Document 1, the failure of the air passage switching portion could not be detected while the blower is stopped, but in the ventilation device 10C according to the third embodiment, the humidity sensor 13C is detected even when the blower 23 is stopped. From the information, it is possible to detect the occurrence of an open failure of the air passage switching unit 12.

In addition, in order to provide a communication means for the ventilation device 10C to communicate with an exhaust device which is another ventilation device for discharging the indoor air to the outside, and to make the room negative pressure when the ventilation device 10C is stopped. May be instructed to increase the exhaust air volume to other exhaust devices. This makes it possible to determine the open failure more quickly and accurately.

Embodiment 4.
23 and 24 are schematic views showing an example of the configuration of the ventilation device according to the fourth embodiment. FIG. 23 schematically shows the case where the ventilation device 50 is in the state of heat exchange ventilation, and FIG. 24 schematically shows the case where the ventilation device 50 is in the state of bypass ventilation.

The ventilation device 50 according to the fourth embodiment includes a main body 50A having an air supply air blower 51, an air supply air passage 52, an exhaust air blower 53, an exhaust air passage 54, and a total heat exchanger 55 inside. Be prepared. The main body 50A includes an outdoor air intake port 521 that sucks in outdoor air, an indoor air exhaust port 522 that blows out air sucked from the outdoor air intake port 521 into the room, and an indoor air intake port 541 that sucks in indoor air. It has an outdoor exhaust port 542 that blows out the air sucked from the indoor side intake port 541 to the outside. The air passage connecting the outdoor side intake port 521 and the indoor side exhaust port 522 is the air supply air passage 52, and the air passage connecting the indoor side intake port 541 and the outdoor side exhaust port 542 is the exhaust air passage 54. The outdoor intake port 521 corresponds to the first intake port, the indoor exhaust port 522 corresponds to the first exhaust port, the indoor intake port 541 corresponds to the second intake port, and the outdoor exhaust port 542 corresponds to the second exhaust port. Corresponds to the exhaust port. The total heat exchanger 55 is an example of a heat exchanger that exchanges heat between the air flowing through the exhaust air passage 54 and the air flowing through the air supply air passage 52. The total heat exchanger 55 is arranged so that the supply air passage 52 and the exhaust air passage 54 intersect in the middle of the supply air passage 52 and the exhaust air passage 54.

The ventilation device 50 has an outside air heater 56 that heats the air sucked from the outdoor intake port 521, that is, the air flowing through the air supply air passage 52. The outside air heater 56 is an example of a temperature control unit. In this example, the outside air heater 56 is provided at the outdoor intake port 521. The outside air heater 56 can raise the temperature of the air supplied to the room by heating the outdoor air taken into the air supply air passage 52.

In the air supply air passage 52, the outdoor air is swept by the air supply air blower 51, and is supplied to the room from the indoor side exhaust port 522 via the outside air heater 56 and the outdoor air intake port 521. In the exhaust air passage 54, the indoor air is swept by the exhaust blower 53, passes through the indoor side intake port 541, and is discharged to the outside from the outdoor side exhaust port 542.

The ventilation device 50 has an air passage switching unit 60. The air passage switching unit 60 is provided on the indoor side of the total heat exchanger 55 in the exhaust air passage 54. By opening and closing the air passage switching unit 60, the exhaust air passage 54 shown in FIG. 23 does not pass through the total heat exchanger 55, and the exhaust air passage 54 shown in FIG. 24 does not pass through the total heat exchanger 55. Bypass ventilation and are switched. As shown in FIG. 23, when the air passage switching unit 60 is open, the exhaust air passage 54 and the air supply air passage 52 intersect in the total heat exchanger 55, and the air passing through the respective air passages intersects with each other. Total heat exchange takes place between them. On the other hand, as shown in FIG. 24, when the air passage switching portion 60 is closed, the exhaust air passage 54 bypasses the total heat exchanger 55, so that the air passing through the exhaust air passage 54 is the air supply air passage 52. No total heat exchange with the air passing through. As described above, in the fourth embodiment, the exhaust air passage 54 can take either a state of passing through the total heat exchanger 55 or a state of bypassing the total heat exchanger 55.

The ventilation device 50 includes an outside air temperature sensor 61, a supply air temperature sensor 62, and a return air temperature sensor 63. The outside air temperature sensor 61 detects the temperature of the outdoor air, which is an example of the air quality index. The outside air temperature sensor 61 is provided in the air supply air passage 52 between the outdoor intake port 521 and the total heat exchanger 55. The supply air temperature sensor 62 detects the temperature of the air, which is an example of the air quality index supplied to the room. The supply air temperature sensor 62 is provided in the supply air passage 52 between the total heat exchanger 55 and the indoor exhaust port 522. The return air temperature sensor 63 detects the temperature of the indoor air, which is an example of the air quality index. The return air temperature sensor 63 is provided in the exhaust air passage 54 between the indoor intake port 541 and the total heat exchanger 55. The outside air temperature sensor 61, the supply air temperature sensor 62, and the return air temperature sensor 63 are examples of environment sensors.

The ventilation device 50 includes a control unit 64 and a remote controller 65. The control unit 64 controls the air supply blower 51, the exhaust blower 53, the air passage switching unit 60, and the outside air heater 56. Further, the control unit 64 receives the temperature detected by the outside air temperature sensor 61, the return air temperature sensor 63, and the supply air temperature sensor 62. The remote controller 65 is connected to the control unit 64 and receives a setting for the ventilation device 50 from the operator. The connection between the remote controller 65 and the control unit 64 is not limited to wired connection, and may be wireless. Further, in the following, the remote controller 65 is referred to as a remote controller.

FIG. 25 is a block diagram schematically showing an example of a main functional configuration of the control unit in the ventilation device according to the fourth embodiment. The control unit 64 includes an outside air temperature detection unit 421, a return air temperature detection unit 422, an air supply temperature detection unit 423, an air passage switching control unit 424, an air supply blower control unit 425, and an exhaust blower control unit 426. , A heater output unit 427, a remote control communication unit 428, a storage unit 429, a failure determination unit 430, and a control manager 431.

The outside air temperature detection unit 421, the return air temperature detection unit 422, and the supply air temperature detection unit 423 are electrically connected to the outside air temperature sensor 61, the return air temperature sensor 63, and the supply air temperature sensor 62, respectively. The outside air temperature detection unit 421, the return air temperature detection unit 422, and the supply air temperature detection unit 423 are the outside air temperature sensor 61, the return air temperature sensor 63, and the supply air temperature sensor 62, respectively, based on the command from the control manager 431. Get the detected temperature.

The air passage switching control unit 424 is electrically connected to the air passage switching unit 60. The air passage switching control unit 424 moves the air passage switching unit 60 between the heat exchange ventilation position shown in FIG. 23 and the bypass ventilation position shown in FIG. 24 based on the command from the control manager 431. Control.

The air supply blower control unit 425 and the exhaust blower control unit 426 are electrically connected to the air supply blower 51 and the exhaust blower 53, respectively. The air supply blower control unit 425 and the exhaust blower control unit 426 control to change the outputs of the air supply blower 51 and the exhaust blower 53, respectively, based on the command from the control manager 431.

The heater output unit 427 is electrically connected to the outside air heater 56. The heater output unit 427 controls to change the output of the outside air heater 56 based on the command from the control manager 431.

The remote control communication unit 428 is connected to the remote control 65 by wire or wirelessly. The remote control communication unit 428 transmits the operation instruction received from the remote control 65 to the control manager 431.

The storage unit 429 stores operation data used by the control manager 431, data for calculating an estimated supply air temperature, which will be described later, and the like.

The failure determination unit 430 detects the failure of the air passage switching unit 60 by the failure detection process described later via the control manager 431. When a failure of the air passage switching unit 60 is detected by the failure determination unit 430, information indicating that an abnormality has occurred in the remote controller 65 may be output via, for example, the control manager 431.

The failure detection process processed by the failure determination unit 430 mainly consists of two steps. In the first step, the failure determination unit 430 calculates an estimated supply air temperature from the ventilation control state of the ventilation device 50, the outside air temperature, and the return air temperature. The ventilation control state indicates whether it is a state of heat exchange ventilation or a state of bypass ventilation. In the second step, the failure determination unit 430 compares the estimated supply air temperature with the actually measured supply air temperature, and determines the difference between the estimated supply air temperature and the actually measured supply air temperature. When the absolute value is larger than the predetermined reference value, it is determined that the air passage switching unit 60 has failed. Further, the failure determination unit 430 determines that the air passage switching unit 60 has not failed when the absolute value of the difference between the estimated supply air temperature value and the actually measured supply air temperature value is smaller than the reference value. If the absolute value of the difference between the estimated supply air temperature and the measured supply air temperature is equal to the reference value, it may be determined that the air passage switching unit 60 is out of order, or the air passage switching unit 60 is not out of order. May be determined. The reference value is an example of reference information.

The control manager 431 is connected to each of the above-mentioned function processing units, mediates data between the function processing units, and instructs each function processing unit to perform arithmetic processing. That is, the control manager 431 comprehensively manages the control in the control unit 64.

FIG. 26 is a diagram showing an example of the relationship between the estimated supply air temperature and the measured supply air temperature when the ventilation device according to the fourth embodiment is operated under certain conditions. In this figure, the ventilation control state, the outside air temperature, the return air temperature, the estimated supply air temperature, and the supply air temperature are shown for each condition of the ventilation operation by the ventilation device 50. The ventilation control state indicates the state of the air passage switching unit 60 of the ventilation device 50, and here indicates whether it is the state of heat exchange ventilation or the state of bypass ventilation. The outside air temperature, the return air temperature, and the supply air temperature are the temperatures detected by the outside air temperature sensor 61, the return air temperature sensor 63, and the supply air temperature sensor 62, respectively, and are actual measurement values. The supply air temperature estimated value is an estimated value of the supply air temperature calculated by the failure determination unit 430. The condition is the identification information attached to the combination of the ventilation control state, the outside air temperature, the return air temperature, the supply air temperature estimate, and the supply air temperature. The following shows an example in which the failure detection process is applied to each of the conditions 26a to 26d in FIG. 26.

(1) Application example of failure detection processing under condition 26a When the ventilation control state of the ventilation device 50 is heat exchange ventilation as in condition 26a, the following is between the estimated supply air temperature, the outside air temperature, and the return air temperature. The relationship of equation (1) is established.
Estimated supply air temperature = outside air temperature-{(outside air temperature-return air temperature) x heat exchange efficiency} ・ ・ ・ (1)

Therefore, in the first step, the supply air temperature estimated value is calculated using the equation (1). Assuming that the heat exchange efficiency is 0.8, the estimated supply air temperature under the condition 26a is calculated by the following equation (2).
30.0 ° C-{(30.0 ° C-20.0 ° C) x 0.8} = 22.0 ° C ... (2)

Next, in the second step, the difference between the estimated supply air temperature and the actually measured supply air temperature, which is the measured supply air temperature, is calculated, and the absolute value of this difference is compared with the reference value. If the absolute value of the difference is equal to or greater than the reference value, it is highly possible that the heat exchange ventilation is not performed normally, and the failure detection algorithm determines that the air passage switching unit 60 has failed. Here, it is assumed that the reference value is 5.0 ° C. The absolute value of the difference between the estimated supply air temperature and the measured supply air temperature under the condition 26a is calculated by the following equation (3).
｜ Measured supply air temperature-Estimated supply air temperature ｜ ＝ ｜ 23.0 ℃ -22.0 ℃ ｜
= 1.0 ° C ... (3)

The absolute value of the difference between the estimated supply air temperature and the measured supply air temperature is 1.0 ° C, which is 5.0 ° C or less, which is the reference value. Therefore, under the condition 26a, the failure detection algorithm determines that the air passage switching unit 60 is not a failure.

(2) Application example of failure detection processing under condition 26b When the ventilation control state of the ventilation device 50 is bypass ventilation as in condition 26b, the following equation (4) is used between the estimated supply air temperature and the outside air temperature. The relationship is established.
Estimated supply air temperature = outside air temperature ... (4)

Therefore, the estimated supply air temperature under the condition 26b is 30.0 ° C. The absolute value of the difference between the estimated supply air temperature and the measured supply air temperature is calculated to be 7.0 ° C. The absolute value of the difference between the estimated supply air temperature and the measured supply air temperature is larger than the reference value of 5.0 ° C. Therefore, under the condition 26b, the failure detection algorithm determines that the air passage switching unit 60 is out of order.

(3) Application example of failure detection processing under conditions 26c and 26d When there is no large difference between the outside air temperature and the return air temperature as in conditions 26c and 26d, the estimated supply air temperature has a different ventilation control state. However, the temperature is almost the same. The estimated supply air temperature of the condition 26c is 20.8 ° C. when calculated according to the equation (1), and the estimated supply air temperature of the condition 26d is 20.0 ° C. from the equation (4). In such a case, the determination based on the absolute value of the difference between the estimated supply air temperature and the measured supply air temperature may not be performed correctly.

Therefore, when there is no large difference between the outside air temperature and the return air temperature as in the conditions 26c and 26d, a temperature difference is provided between the outside air temperature and the return air temperature by a heater or the like. For example, in the case of the conditions 26c and 26d, if the outside air temperature is heated to 30 ° C. by the outside air heater 56, it becomes the same as the case of the conditions 26a and 26b, and the failure detection of the air passage switching unit 60 becomes possible.

Since the purpose is to provide a temperature difference between the outside air temperature and the return air temperature, the return air may be heated instead of the outside air. That is, the installation location of the heater can be arbitrarily set. Further, the outside air or the return air taken into the ventilation device 50 may be cooled in order to provide a temperature difference between the outside air temperature and the return air temperature. Further, the same effect can be obtained by providing a temperature control means for providing a temperature difference between the outside air temperature and the return air temperature in the indoor unit of the air conditioner installed in the same air-conditioned space.

Further, at least one of the air supply blower 51 and the exhaust blower 53 may be stopped. In one example, the air supply blower 51 of the air supply air passage 52 may be stopped to determine the failure of the air passage switching unit 60. By stopping the air supply blower 51 and moving only the exhaust blower 53, the room becomes negative pressure. Therefore, even if the air supply blower 51 is stopped, the outdoor air passes through the air supply air passage 52 and is swept into the room. The indoor air is discharged to the outside by the exhaust blower 53 through the exhaust air passage 54. That is, since the indoor and outdoor air paths passing through the ventilation device 50 are the same as when the air supply blower 51 and the exhaust blower 53 are operating, the failure of the air passage switching unit 60 in the above-mentioned failure detection process Can be detected.

FIG. 27 is a flowchart showing an example of the procedure of failure determination processing in the ventilation device according to the fourth embodiment. First, the failure determination unit 430 calculates the difference between the outside air temperature acquired from the outside air temperature detection unit 421 and the return air temperature acquired from the return air temperature detection unit 422 (step S31). The failure determination unit 430 determines whether the difference between the outside air temperature and the return air temperature is equal to or greater than the reference value (step S32). When the difference between the outside air temperature and the return air temperature is not equal to or greater than the reference value (No in step S32), the heater output unit 427 controls to heat the outside air heater 56 (step S33). As explained in (3) above, this may not be determined correctly by the absolute value of the difference between the estimated supply air temperature and the measured supply air temperature. Therefore, the outside air is heated to heat the outside air. This is to make the temperature difference between the temperature and the return air temperature equal to or more than a predetermined value. After that, the process returns to step S31. The heating of the outside air in step S33 is repeated until the difference between the outside air temperature and the return air temperature becomes equal to or higher than a certain reference value.

When the difference between the outside air temperature and the return air temperature is equal to or greater than the reference value (Yes in step S32), the failure determination unit 430 calculates the supply air temperature estimated value (step S34). The failure determination unit 430 calculates the supply air temperature estimated value according to the equation (1) when the ventilation device 50 is performing heat exchange ventilation, and when the ventilation device 50 is performing bypass ventilation, the failure determination unit 430 calculates the supply air temperature estimation value. The estimated supply air temperature is calculated according to the equation (4). When calculating the estimated supply air temperature, the correction may be performed in consideration of the heat loss of the ventilation device 50.

Next, the failure determination unit 430 calculates the absolute value of the difference between the calculated supply air temperature estimation value and the supply air temperature actual measurement value acquired from the supply air temperature detection unit 423 (step S35). After that, the failure determination unit 430 determines whether the calculated absolute value of the difference is equal to or less than the reference value (step S36). When the absolute value of the calculated difference is equal to or less than the reference value (Yes in step S36), the failure determination unit 430 determines that the air passage switching unit 60 has no failure (step S37), and the process ends. .. At this time, error processing is not executed.

Further, when the absolute value of the calculated difference is not equal to or less than the reference value (No in step S36), the failure determination unit 430 determines that the air passage switching unit 60 has a failure (step S38). Then, the control manager 431 executes error processing (step S39). Typical error processing includes stopping the air supply blower 51 and the exhaust blower 53, or notifying the operator of the occurrence of an abnormality. After that, the process ends.

In the above description, the case where the temperature sensor is used as the environment sensor is shown, but the gas sensor described in the second embodiment may be used as the environment sensor, or the humidity sensor described in the third embodiment may be used. You may.

As described above, the ventilation device 50 according to the fourth embodiment is provided with the air supply blower 51, the air supply air passage 52, the exhaust blower 53, the exhaust air passage 54, and the air passage switching provided in the exhaust air passage 54. Unit 60, an outside air temperature sensor 61, a supply air temperature sensor 62, a return air temperature sensor 63, a control unit 64 that controls the operation of the supply air blower 51, the exhaust blower 53, and the air passage switching unit 60. To prepare for. The control unit 64 detects a failure of the air passage switching unit 60 by using the temperature information detected by the outside air temperature sensor 61, the supply air temperature sensor 62, and the return air temperature sensor 63. This eliminates the need to add parts for the purpose of detecting the failure of the air passage switching unit 60, so that the development cost of the ventilation device 50 can be reduced.

Further, in Patent Document 1, a failure of the air passage switching portion could not be detected while the blower was stopped, but in the ventilation device 50 according to the fourth embodiment, the outside air temperature sensor 61 is used even when the air supply blower 51 is stopped. , The failure of the air passage switching unit 60 can be detected from the temperature information detected by the supply air temperature sensor 62 and the return air temperature sensor 63.

The control units 14 and 64 of the first to fourth embodiments are realized as a processing circuit. The processing circuit may be dedicated hardware or may be a circuit including a processor. FIG. 28 is a block diagram schematically showing an example of the hardware configuration of the control unit provided in the ventilation device according to the first to fourth embodiments. The control units 14 and 64 include a processor 501 and a memory 502. The processor 501 and the memory 502 are connected via the bus line 503. The control units 14 and 64 are realized by the processor 501 executing the program stored in the memory 502. Further, a plurality of processors and a plurality of memories may cooperate to realize the above function. Further, a part of the functions of the control units 14 and 64 may be implemented as an electronic circuit which is dedicated hardware, and the other part may be realized by using the processor 501 and the memory 502. In the case of the first to third embodiments, the control unit 14 controls the fan drive unit 24 and the air passage switching unit 12 by an electric signal. In the case of the fourth embodiment, the control unit 64 controls the air supply blower 51, the exhaust blower 53, and the air passage switching unit 60 by an electric signal.

The configuration shown in the above embodiments is an example, and can be combined with another known technique, can be combined with each other, and does not deviate from the gist. It is also possible to omit or change a part of the configuration.

10A, 10B, 10C, 50 Ventilation device, 11,50A main body, 12,60 air passage switching part, 13A temperature sensor, 13B gas sensor, 13C humidity sensor, 14,64 control part, 21 intake port, 22 exhaust port, 23 Blower, 24 fan drive, 25 fan, 51 air supply blower, 52 air supply air passage, 53 exhaust air blower, 54 exhaust air passage, 55 total heat exchanger, 56 outside air heater, 61 outside air temperature sensor, 62 supply air temperature Sensor, 63 Return air temperature sensor, 65 Remote controller (remote control), 100 Store, 101 Cooking room, 201 Smoking room, 202 Corridor, 203 Wall, 204 Air supply port, 221 Fan drive control unit, 222,424 Ventilation switching control Unit, 223 gas detection unit, 224,430 failure determination unit, 225,431 control manager, 301 washroom, 421 outside air temperature detection unit, 422 return air temperature detection unit, 423 supply air temperature detection unit, 425 supply air blower control unit. 426 Exhaust blower control unit, 427 Heater output unit, 428 remote control communication unit, 429 storage unit, 521 outdoor intake port, 522 indoor side exhaust port, 541 indoor side intake port, 542 outdoor outdoor exhaust port.

Claims (11)

A main body having one or more air passages connecting an intake port for sucking air and an exhaust port for blowing out air sucked from the intake port, and a main body portion.
A blower provided in the air passage and rotating a fan to suck air from the intake port and guide the sucked air to the exhaust port.
An air passage switching unit that switches the path of the air swept by the blower in the air passage,
One or more environment sensors that detect the nature of the air sucked in from the air intake or the air blown out from the exhaust.
A control unit that controls the operation of the blower and the air passage switching unit, and
Equipped with
The control unit determines whether or not a failure has occurred in the air passage switching unit based on the control state of the air passage switching unit and the data of the air quality index indicating the properties of the air detected by the environment sensor. A ventilation device characterized by determination. The environment sensor is a temperature sensor.
The ventilation device according to claim 1, wherein the control unit uses the temperature data detected by the temperature sensor as the data of the air quality index. The environment sensor is a humidity sensor.
The ventilation device according to claim 1, wherein the control unit uses humidity data detected by the humidity sensor as data of the air quality index. The environment sensor is a gas sensor and
The ventilation device according to claim 1, wherein the control unit uses gas concentration data in the air detected by the gas sensor as the data of the air quality index. The control unit uses the time required for the air quality index to change from a predetermined first value to a second value during the ventilation operation in which the blower is operated, and the air passage switching unit. The ventilation device according to any one of claims 2 to 4, wherein it is determined whether or not a failure has occurred. The claim is characterized in that the control unit determines whether or not a failure has occurred in the air passage switching unit by using the value of the air quality index after the ventilation operation in which the blower is operated is stopped. The ventilation device according to any one of 2 to 4. Claims 2 to 4, wherein the control unit determines whether or not a failure of the air passage switching unit has occurred by using the air quality index during the ventilation operation in which the blower is operated. The ventilation device according to any one. Claims 2 to 4 are characterized in that the control unit determines a failure of the air passage switching unit by using the air quality index when the operation of the blower in at least one air passage is stopped. The ventilation device according to any one of the above. The main body connects between a first intake port arranged on the outdoor side and a first exhaust port arranged on the indoor side of a ventilation target, and an air supply air passage for supplying air from the outdoor to the room. An exhaust air passage that connects the second intake port arranged on the indoor side and the second exhaust port arranged on the outdoor side and exhausts the air in the room to the outside of the room, and the air flowing through the exhaust air passage. And a heat exchanger that exchanges heat between the air supply air passage and the air flowing through the air supply air passage.
The control unit uses the estimated value of the air quality index of the air blown out from the first exhaust port and the actually measured value of the air quality index of the air actually blown out from the first exhaust port. The ventilation device according to any one of claims 2 to 4, wherein the failure of the road switching unit is determined. Further, a temperature control unit for heating or cooling the air sucked from the first intake port or the second intake port is provided.
The ninth aspect of the present invention, wherein the control unit controls the temperature control unit so that the temperature of the air before passing through the heat exchanger in the exhaust air passage or the air supply air passage changes. Ventilation system. The ninth or tenth aspect of the present invention, wherein the control unit determines a failure of the air passage switching unit by using the air quality index when the operation of the blower in the air supply air passage is stopped. Ventilation system.

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