JP7047938B2 - Ventilation system - Google Patents

Description

The present invention relates to a humidifying device and a ventilation device having a humidifying function.

Conventionally, a humidifying device that performs a drying operation of drying a humidifying element after the completion of the humidifying operation has been proposed.

For example, as in the humidifying device described in Patent Document 1, a humidifying mode in which the water supply valve is opened and the air blowing means is rotated is started, and at the end of the humidifying mode, a cleaning mode is performed in which the water supply valve is opened and the air blowing means is stopped. A humidifying device having a configuration in which a drying mode is performed in which the water supply valve is closed and the air blowing means is dried after the cleaning mode is completed has been proposed. By providing the above-mentioned configuration, the humidifying device described in Patent Document 1 has an effect of suppressing the precipitation of scale components contained in water on the humidifying element in the drying mode.

Japanese Unexamined Patent Publication No. 2015-152141

By the way, a state in which the humidifying element is excessively dried during humidification due to factors such as the temperature and humidity of the air passing through the humidifying element or the amount of air blown to the humidifying element (hereinafter referred to as an overdried state). , And a situation occurs in which the scale component is deposited.

The present invention has been made to solve the above-mentioned problems, and provides a ventilation device having a humidifying function of suppressing the precipitation of a humidifying element by a scale component.

In the ventilation device according to the first invention, an air supply air inlet, an air supply air outlet, an exhaust air inlet, and an exhaust air outlet are formed, and an air supply air passage in which the air supply air inlet and the air supply air outlet communicate with each other. A main body casing in which an exhaust air passage that communicates with an exhaust suction port and an exhaust air outlet is formed , and an air supply blower that is provided in the air supply air passage and blows air from the air supply suction port to the air supply air outlet. Between the exhaust blower provided in the exhaust air passage and blowing air from the exhaust suction port to the exhaust outlet, and the air flowing in the air supply air passage and the air flowing in the exhaust air passage provided in the air supply air passage and the exhaust air passage. A heat exchanger that exchanges heat with, a humidifying element that is provided on the air supply outlet side of the air supply air passage and humidifies the passing air, a water supply means that supplies water to the humidifying element, and a water supply means. A control unit that controls the supply water flow rate and the air volume of the supply air blower, an input interface that receives information on the temperature of the air passing through the supply air passage and information on the humidity of the air passing through the supply air passage, and an input. A dry state determination unit that determines whether the humidifying element is in an overdried state in which scale is deposited on the humidifying element based on the temperature and humidity acquired through the interface, the air volume of the air supply blower, and the water supply flow rate of the water supply means. , A bypass air passage formed in the exhaust air passage and formed so that the air flowing through the exhaust air passage bypasses the heat exchanger, and a position and a bypass wind provided in the exhaust air passage to open the bypass air passage. It is equipped with a damper that can be moved to a position that blocks the road, and when the dry state determination unit determines that the humidifying element is in an overdrying state, the control unit suppresses the overdrying state of the humidifying element and scale is deposited on the humidifying element. The control unit controls the position of the damper in the overdrying suppression operation, and the control unit controls the damper to move to the position where the bypass air passage is blocked in the overdrying suppression operation. ..

In the ventilation device according to the second invention, the air supply air inlet, the air supply air outlet, the exhaust air inlet, and the exhaust air outlet are formed, and the air supply air inlet and the air supply air outlet communicate with each other inside. A main body casing in which an exhaust air passage that communicates with the exhaust suction port and an exhaust air outlet is formed, and an air supply blower that is provided in the air supply air passage and blows air from the air supply suction port to the air supply air outlet. Between the exhaust blower provided in the exhaust air passage and blowing air from the exhaust suction port to the exhaust outlet, and the air flowing in the air supply air passage and the air flowing in the exhaust air passage provided in the air supply air passage and the exhaust air passage. A heat exchanger that exchanges heat with, a humidifying element that is provided on the air supply outlet side of the air supply air passage and humidifies the passing air, a water supply means that supplies water to the humidifying element, and a water supply means. A control unit that controls the supply water flow rate and the air volume of the supply air blower, an input interface that receives information on the temperature of the air passing through the supply air passage and information on the humidity of the air passing through the supply air passage, and an input interface. A dry state determination unit that determines whether or not the humidifying element is in an over-dried state in which scale is deposited on the humidifying element based on the temperature and humidity acquired through the ventilation, the air volume of the air supply blower, and the water supply flow rate of the water supply means. When the dry state determination unit determines that the humidifying element is in an overdrying state, the control unit controls to suppress the overdrying state of the humidifying element and perform an overdrying suppressing operation to suppress the precipitation of scale on the humidifying element. However, in the overdrying suppression operation, the control unit controls to increase the air volume of the exhaust blower from immediately before the overdrying suppression operation.
In the ventilation device according to the third invention, an air supply air inlet, an air supply air outlet, an exhaust air inlet, and an exhaust air outlet are formed, and an air supply air passage in which the air supply air inlet and the air supply air outlet communicate with each other. A main body casing in which an exhaust air passage connecting the exhaust suction port and the exhaust outlet is formed, and an air supply blower provided in the air supply air passage to blow air from the air supply suction port to the air supply outlet. Between the exhaust blower provided in the exhaust air passage and blowing air from the exhaust suction port to the exhaust outlet, and the air flowing in the air supply air passage and the air flowing in the exhaust air passage provided in the air supply air passage and the exhaust air passage. A heat exchanger that exchanges heat with, a humidifying element that is provided on the air supply outlet side of the air supply air passage and humidifies the passing air, a water supply means that supplies water to the humidifying element, and a water supply means. A control unit that controls the supply water flow rate and the air volume of the supply air blower, an input interface that receives information on the temperature of the air passing through the supply air passage and information on the humidity of the air passing through the supply air passage, and a heat exchanger. The air supply temperature sensor and air supply humidity sensor, which are arranged inside the air supply air passage on the air supply air inlet side and are communicably connected to the input interface, and the exhaust air on the exhaust air inlet side of the heat exchanger. Exhaust temperature sensor and exhaust humidity sensor located inside the road and communicable with the input interface, the temperature acquired by the supply air temperature sensor, the humidity acquired by the supply air humidity sensor, and the temperature acquired by the exhaust temperature sensor. A dry state determination unit that determines whether or not the humidifying element is in an overdried state in which scale is deposited on the humidifying element based on the temperature acquired by the exhaust humidity sensor, the air volume of the air supply blower, and the water supply flow rate of the water supply means. When the drying state determination unit determines that the humidifying element is in an overdrying state, the control unit performs an overdrying suppressing operation that suppresses the overdrying state of the humidifying element and suppresses the precipitation of scale on the humidifying element. To control.

In all of the ventilation devices according to the first invention , the second invention and the third invention, when the dry state determination unit determines that the humidifying element is in the overdry state, the control unit determines the overdry state of the humidifying element. It is provided with a configuration for controlling the overdrying suppression operation that suppresses and suppresses the precipitation of scale on the humidifying element. This configuration suppresses the humidifying element from becoming overdried and has the effect of suppressing the precipitation of scale on the humidifying element.

It is a schematic diagram which shows the internal structure of the humidifying apparatus which concerns on Embodiment 1. FIG. It is a functional block diagram of the humidifying apparatus which concerns on Embodiment 1. FIG. It is a flowchart which shows an example of the normal operation of the humidifying apparatus which concerns on Embodiment 1. FIG. It is a flowchart of the control which suppresses the overdrying state of the humidifying element of the humidifying apparatus which concerns on Embodiment 1. FIG. It is a flowchart which derives the overdrying determination value fd in the humidifying apparatus which concerns on Embodiment 1. FIG. It is a flowchart of control of the overdrying suppression operation in the humidifying apparatus which concerns on Embodiment 1. FIG. It is a flowchart of control of the overdrying suppression operation in the humidifying apparatus which concerns on Embodiment 2. FIG. It is a schematic diagram which shows the internal structure of the humidifying apparatus which concerns on Embodiment 3. FIG. It is a functional block diagram of the humidifying device of the humidifying device which concerns on Embodiment 3. FIG. It is a flowchart which derives the overdrying determination value fd in the humidifying apparatus which concerns on Embodiment 3. FIG. It is a flowchart of control of the overdrying suppression operation in the humidifying apparatus which concerns on Embodiment 3. FIG. It is a schematic diagram which shows the internal structure in the case where the bypass air passage of the ventilation apparatus which concerns on Embodiment 4 is closed. It is a schematic diagram which shows the internal structure at the time of opening the bypass air passage of the ventilation apparatus which concerns on Embodiment 4. FIG. It is a functional block diagram of the ventilation apparatus which concerns on Embodiment 4. FIG. It is a flowchart which shows an example of the control of the normal operation of the ventilation apparatus which concerns on Embodiment 4. FIG. It is a flowchart which derives the overdrying determination value fd in the ventilation apparatus which concerns on Embodiment 4. It is a flowchart of control of the overdrying suppression operation in the ventilation apparatus which concerns on Embodiment 4. FIG. It is a flowchart of control of the overdrying suppression operation in the ventilation apparatus which concerns on Embodiment 5. It is a flowchart of control of the overdrying suppression operation in the ventilation apparatus which concerns on Embodiment 6. It is a flowchart of the control which suppresses the overdrying state of the humidifying element of the ventilation apparatus which concerns on Embodiment 7. It is an example of the table which shows the 1st to 4th overdrying suppression operation of the ventilation apparatus which concerns on Embodiment 7.

Embodiment 1.
FIG. 1 is a schematic view showing the internal configuration of the humidifying device according to the first embodiment. The humidifying device 100 includes a main body casing 1, a blower 2, a temperature sensor 3, a humidity sensor 4, a humidifying element 5, a water supply pipe 6, a water supply valve 7, a control device 8, and an operation terminal 9. .. The water supply pipe 6 and the water supply valve 7 correspond to the water supply means of the present invention.

The main body casing 1 is a member that forms the exterior of the humidifying device 100. The main body casing 1 houses a blower 2, a temperature sensor 3, a humidity sensor 4, a humidifying element 5, a water supply pipe 6, a water supply valve 7, and a control device 8. Further, a suction port 10, an outlet 11, and a water supply pipe connection port 12 are formed on the outer surface of the main body casing 1. The suction port 10 and the outlet 11 are connected to a humidifying space, which is a space where the humidifying device 100 performs humidification. The water supply pipe connection port 12 is connected to a water supply source such as water supply. Further, the suction port 10 and the air outlet 11 are communicated with each other by an air passage 13 formed inside the main body casing 1.

The blower 2 is a device that blows the air inside the air passage 13 from the suction port 10 side to the air outlet 11 side. The blower 2 is arranged inside the air passage 13. Further, the blower 2 is configured to be able to control the air volume, for example, by being composed of a fan and a motor capable of controlling the rotation speed. In the first embodiment, the blower 2 can control the air volume in three stages of strong, medium, and weak in descending order of air volume.

The temperature sensor 3 is an element capable of detecting temperature, and the humidity sensor 4 is an element capable of detecting humidity. The temperature sensor 3 and the humidity sensor 4 are arranged inside the air passage 13.

The humidifying element 5 is a member that humidifies the passing air. For example, a filter containing water is used as the humidifying element 5. The humidifying element 5 is arranged inside the air passage 13, and is arranged at least on the air outlet 11 side of the temperature sensor 3 and the humidity sensor 4.

The water supply pipe 6 is a pipe that connects the humidifying element 5 and the water supply pipe connection port 12. The humidifying element 5 is supplied with water from the water source via the water supply pipe 6 and the water supply pipe connection port 12.

The water supply valve 7 is a valve that adjusts the water supply flow rate of the humidifying element 5. The water supply valve 7 is arranged in the middle of the water supply pipe 6. The water supply valve 7 is configured to be able to control the water supply flow rate of the humidifying element 5, such as a two-way valve capable of controlling the opening degree of the valve. In the first embodiment, the state where the valve is fully open is 100% and the state where the valve is fully closed is 0%, and the water supply flow rate can be controlled in five stages of 100%, 75%, 50%, 25%, and 0%. ..

The control device 8 controls the air volume of the blower 2 and the water supply flow rate to the humidifying element 5 based on the temperature detected by the temperature sensor 3 and the humidity detected by the humidity sensor 4.

The operation terminal 9 is at least a terminal for the user to perform an operation related to starting the operation of the humidifying device 100 and stopping the operation of the humidifying device 100. The operation terminal 9 corresponds to, for example, a remote controller, a computer in which an application for operation is installed, a tablet terminal, a smartphone, or the like.

Next, the flow of air inside the humidifying device 100 according to the first embodiment will be described. First, when the blower 2 is operated, the air in the humidifying space flows into the humidifying device 100 from the suction port 10. The air flowing in from the suction port 10 is referred to as suction air 14.

The suction air 14 flows into the air passage 13. The temperature sensor 3 detects the temperature of the suction air 14 that has flowed into the air passage 13. Further, the humidity sensor 4 detects the humidity of the suction air 14 that has flowed into the air passage 13. The suction air 14 passes through the blower 2 and flows toward the humidifying element 5.

The suction air 14 passes through the humidifying element 5 and is humidified. Here, the air humidified by the humidifying element 5 is referred to as the humidified air 15. After humidification, the air 15 flows out from the outlet 11 and is blown out to the humidified space again.

FIG. 2 is a functional block diagram of the humidifying device according to the first embodiment. Next, a functional block diagram of the humidifying device 100 according to the first embodiment will be described. The control device 8 includes an input interface 16, an output interface 17, and a microcomputer 18.

The input interface 16 is communicably connected to the temperature sensor 3, the humidity sensor 4, and the operation terminal 9, and is operated by the operation terminal 9 with information on the temperature detected by the temperature sensor 3 and information on the humidity detected by the humidity sensor 4. Receives the information of the operation contents. The output interface 17 is communicably connected to the blower 2 and the water supply valve 7, and transmits a control signal regarding the air volume of the blower 2 and a control signal regarding the opening degree of the water supply valve 7, respectively.

The microcomputer 18 has the functions of a storage unit 19, a control unit 20, a dry state determination unit 21, and a timer unit 22. Further, the microcomputer 18 includes a processor such as a CPU (Central Processing Unit), a memory such as a RAM (Random Access Memory) and a ROM (Read Only Memory), and a timer.

The storage unit 19 stores a software program executed by the processor and a numerical value used for controlling the air volume of the blower 2 and the opening degree of the water supply valve 7. The storage unit 19 is realized by storing a program and a numerical value in the memory.

The control unit 20 generates a control signal regarding the air volume of the blower 2 and a control signal regarding the opening degree of the water supply valve 7, and controls the blower 2 and the water supply valve 7. The dry state determination unit 21 determines whether or not the humidifying element 5 is in a dry state. The control unit 20 and the dry state determination unit 21 are realized by the processor executing processing according to a software program stored in the memory.

The timer unit 22 measures the time. The timer unit 22 is realized by a timer.

Next, an example of the normal operation of the humidifying device according to the first embodiment will be described. The normal operation in the present invention is not limited to the example described below, and refers to an operation excluding the overdrying suppression operation described later. FIG. 3 is a flowchart showing an example of normal operation of the humidifying device according to the first embodiment. The flowchart of FIG. 3 starts when the user performs an operation of starting the operation of the humidifying device 100 from the operation terminal 9.

In step S1, the timer unit 22 resets the humidification operation time ta.

After the processing of step S1 is completed, the process proceeds to step S2. In step S2, the timer unit 22 starts measuring the humidification operation time ta.

After the processing of step S2 is completed, the process proceeds to step S3. In step S3, the control unit 20 controls the humidifying device 100 to perform the humidifying operation. Humidification operation is an operation that adjusts the humidification space to a predetermined humidity. In the humidifying operation, the control unit 20 opens the water supply valve 7 to supply water to the humidifying element 5, operates the blower 2 and controls to blow air to the humidifying element 5. In the humidification operation in the first embodiment, it is assumed that the air volume is medium and the water supply flow rate is controlled to 75%.

After the processing of step S3 is completed, the process proceeds to step S4. In step S4, the control unit 20 determines whether or not the user has performed an operation to stop the operation of the humidifying device 100 from the operation terminal 9.

When the control unit 20 determines that the user has performed an operation to stop the operation of the humidifying device 100 from the operation terminal 9 (step S4, YES), the process proceeds to step S5. In step S5, the control unit 20 controls the humidifying device 100 to perform the drying operation for a predetermined time. The drying operation is an operation of drying the humidifying element 5 that has been moistened by the humidifying operation. In the drying operation, the control unit 20 closes the water supply valve 7 to stop the water supply to the humidifying element 5, operates the blower 2 to control the air to be blown to the humidifying element 5, and dries the humidifying element 5. .. In the drying operation according to the first embodiment, it is assumed that the air volume is strong and the water supply flow rate is controlled to 0%.

After the process of step S5 is completed, the process proceeds to step S6. In step S6, the control unit 20 stops the operation of the humidifying device 100. When the operation is stopped, the control unit 20 controls to close the water supply valve 7 to stop the water supply to the humidifying element 5 and stop the blower 2. After the processing of step S6 is completed, the normal operation of the humidifying device 100 is terminated.

If the control unit 20 determines that the user has not performed an operation to stop the operation of the humidifying device 100 from the operation terminal 9 (step S4, NO), the process proceeds to step S7. In step S7, the timer unit 22 determines whether or not the humidification operation time ta is larger than the predetermined drying operation start time ts.

When the timer unit 22 determines that the humidification operation time ta is larger than the drying operation start time ts (step S7, YES), the timer unit 22 proceeds to step S8. In step S8, the control unit 20 controls the humidifying device 100 to perform the drying operation for a predetermined time. The drying operation in step S8 is the same as the drying operation described in step S5, and the description thereof will be omitted. After the end of step S8, the process proceeds to step S1, and the timer unit 22 resets the humidification operation time ta.

When the timer unit 22 determines that the humidification operation time ta is equal to or less than the drying operation start time ts (steps S7, NO), the process proceeds to step S4, and the control unit 20 again operates the humidifying device 100 from the operation terminal 9 by the user. Judge whether or not the operation to stop is performed.

FIG. 4 is a flowchart of control for suppressing the overdrying state of the humidifying element of the humidifying device according to the first embodiment. The control of the flowchart of FIG. 4 starts when the user performs an operation of starting the operation of the humidifying device 100 from the operation terminal 9. That is, the control of the flowchart of FIG. 3 and the control of the flowchart of FIG. 4 are performed at the same time.

In step S11, the dry state determination unit 21 derives the overdrying determination value fd. The overdrying determination value fd is a value used for determining whether or not the humidifying element 5 is in an overdrying state. The overdrying determination value fd is based on the difference ΔT between the dry-bulb temperature and the wet-bulb temperature of the air immediately before passing through the humidifying element 5, the air volume Qa passing through the humidifying element 5, and the water supply flow rate Qw supplied to the humidifying element 5. Is derived. Details of the derivation of the overdrying determination value fd will be described later.

After the process of step S11 is completed, the process proceeds to step S12. In step S12, the dry state determination unit 21 determines whether or not the overdry determination value fd derived in step S11 is larger than the overdry determination threshold value ε. The overdrying determination threshold value ε is a predetermined constant and is stored in the storage unit 19.

If the dry state determination unit 21 determines in step S12 that the overdrying determination value fd is larger than the overdrying determination threshold value ε (steps S12, Yes), the process proceeds to step S13. In step S13, the control unit 20 stops the control of the normal operation in the flowchart of FIG. That is, if the humidifying device 100 is performing a humidifying operation or a drying operation, those operations are stopped.

After the process of step S13 is completed, the process proceeds to step S14. In step S14, the control unit 20 controls the humidifying device 100 to perform an overdrying suppression operation. The overdrying suppression operation is an operation performed to suppress the overdrying state of the humidifying element 5. The details of the overdrying suppression operation will be described later.

After the process of step S14 is completed, the process proceeds to step S15. In step S15, the dry state determination unit 21 derives the overdrying determination value fd as in step S11.

After the process of step S15 is completed, the process proceeds to step S16. In step S16, the dry state determination unit 21 determines whether or not the overdry determination value fd derived in step S15 is larger than the overdry determination threshold value ε.

When the dry state determination unit 21 determines in step S16 that the overdry determination value fd is larger than the overdry determination threshold value ε (steps S16, Yes), the process proceeds to step S14, and the overdry suppression operation is performed again.

When the dry state determination unit 21 determines that the overdrying determination value fd is equal to or less than the overdrying determination threshold value ε in step S16 (steps S16, No), the process proceeds to step S17. In step S17, the control unit 20 controls the humidifying device 100 to restart the normal operation. In step S17, control is performed so that the operation performed by the humidifying device 100 when stopped in step S13 is performed. For example, when the humidifying operation is stopped in step S13, the control unit 20 controls the humidifying device 100 to perform the humidifying operation in step S17.

After the processing of step S17 is completed, or when the overdrying determination value fd is equal to or less than the overdrying determination threshold value ε in step S12 (step S12, No), the process proceeds to step S18. In step S18, the dry state determination unit 21 determines whether the control unit 20 has stopped the operation of the humidifying device 100.

When the dry state determination unit 21 determines in step S18 that the control unit 20 has stopped the operation of the humidifying device 100 (step S17, Yes), the control for suppressing the overdry state is terminated. When the dry state determination unit 21 determines in step S18 that the operation of the humidifying device 100 has not been stopped (steps S17, No), the process proceeds to step S11, and the dry state determination unit 21 determines the overdrying determination value fd. Is derived.

FIG. 5 is a flowchart for deriving the overdrying determination value fd in the humidifying device according to the first embodiment. The flowchart of FIG. 5 starts when the process of step S11 or step S15 of the flowchart of FIG. 4 is performed. Here, the method of deriving the overdrying determination value fd performed by the drying state determination unit 21 will be described in detail.

In step S21, the dry state determination unit 21 acquires the temperature detected by the temperature sensor 3 as the dry-bulb temperature Td1 of the sucked air 14 via the input interface 16.

After the processing of step S22 is completed, the process proceeds to step S22. In step S22, the dry state determination unit 21 acquires the humidity detected by the humidity sensor 4 as the relative humidity φ1 of the sucked air 14 via the input interface 16.

After the process of step S22 is completed, the process proceeds to step S23. In step S23, the dry state determination unit 21 derives the air volume Qa passing through the humidifying element 5. Since the air volume Qa is controlled by the control unit 20, there is a method of deriving the air volume Qa by referring to the control value related to the air volume Qa transmitted from the control unit 20. As an example, in the first embodiment, the storage unit 19 stores the value of the air volume Qa when the air volume is strong, medium, and weak, and the dry state determination unit 21 relates to the air volume controlled by the control unit 20. The value of the air volume Qa is acquired from the storage unit 19 with reference to the control value.

After the process of step S23 is completed, the process proceeds to step S24. In step S24, the dry state determination unit 21 derives the water supply flow rate Qw supplied to the humidifying element 5. Since the water supply flow rate Qw is controlled by the control unit 20, there is a method of deriving the water supply flow rate Qw by referring to the control value related to the water supply flow rate Qw transmitted from the control unit 20. As an example, in the first embodiment, the storage unit 19 stores the value of the water supply flow rate Qw when the water supply flow rate is 100%, 75%, 50%, 25%, and 0%, respectively, and the dry state determination unit. 21 acquires the value of the water supply flow rate Qw from the storage unit 19 with reference to the control value regarding the water supply flow rate controlled by the control unit 20.

After the process of step S24 is completed, the process proceeds to step S25. In step S25, the dry state determination unit 21 derives the wet-bulb temperature Tw1 of the suction air 14 based on the dry-bulb temperature Td1 acquired in step S21 and the relative temperature φ1 acquired in step S22. As a method for deriving the wet-bulb temperature Tw1, the storage unit 19 stores a table simulating the correlation in the wet-bulb temperature Tw1 with the dry-bulb temperature Td1 and the relative humidity φ1 as rows or columns and the wet-bulb temperature Tw1 as an element. There is a method of deriving the wet-bulb temperature Tw1 by referring to the table the dry-bulb temperature Td1 acquired in step S21 and the relative temperature φ1 acquired in step S22. Further, the storage unit 19 stores an approximate expression of the correlation between the dry-bulb temperature Td1 and the relative humidity φ1 and the wet-bulb temperature Tw in the wet-bulb temperature diagram, and the dry-bulb temperature Td1 and step S22 acquired in step S21 There is also a method of calculating the wet-bulb temperature Tw1 by substituting the acquired relative temperature φ1 into the equation.

After the process of step S25 is completed, the process proceeds to step S26. In step S26, the dry state determination unit 21 subtracts the wet-bulb temperature Tw1 derived in step S25 from the dry-bulb temperature Td1 acquired in step S21, and derives the dry-bulb temperature difference ΔT1 of the suction air 14.

After the process of step S26 is completed, the process proceeds to step S27. In step S27, the dry state determination unit 21 determines the overdrying determination value fd based on the air volume Qa derived in step S23, the water supply flow rate Qw derived in step S24, and the dry / wet ball temperature difference ΔT of the suction air 14 derived in step S26. Is derived. As a method of deriving the overdrying determination value fd, there is a method in which the storage unit 19 stores the equation of Equation 1 and substitutes each numerical value into the equation to calculate the overdrying determination value fd.

The f (ΔT, Qa, Qw) of the equation 1 is a function determined by three variables of the dry / wet ball temperature difference ΔT, the air volume Qa, and the water supply flow rate Qw. The function f is derived experimentally. Specifically, the designer of the humidifying device 100 experimentally determines whether or not the condition is such that the scale component is deposited on the humidifying element 5 by changing the dry / wet ball temperature difference ΔT, the air volume Qa, and the water supply flow rate Qw, respectively. Based on the results obtained in the experiment, the designer found that the overdrying determination value fd exceeds the overdrying determination threshold value ε (fd> ε) under the condition that the scale component is deposited from the humidifying element 5, and the scale component is deposited from the humidifying element 5. Under the condition that the overdrying determination value fd is not satisfied, a function f is derived such that the overdrying determination value fd is equal to or less than the overdrying determination threshold value ε (fd ≦ ε).

Further, the function f satisfies the relationship that the overdrying determination value fd increases as the dry / wet ball temperature difference ΔT increases. This is because the larger the dry / wet ball temperature difference ΔT is, the more dry air flows to the humidifying element 5, so that the humidifying element 5 is dried and the scale component is more likely to be deposited.

Further, the function f satisfies the relationship that the overdrying determination value fd increases as the air volume Qa increases. This is because the larger the air volume Qa, the larger the amount of air passing through the humidifying element 5, and the condition is that the humidifying element 5 dries and the scale component is easily deposited.

Further, the function f satisfies the relationship that the overdrying determination value fd decreases as the water supply flow rate Qw increases. This is because the larger the water supply flow rate Qw, the larger the amount of water supplied to the humidifying element, and the humidifying element 5 becomes wet and the scale component is less likely to be deposited.

After the processing of step S27 is completed, the drying state determination unit 21 ends the derivation of the overdrying determination value fd.

FIG. 6 is a flowchart of control of the overdrying suppression operation in the humidifying device according to the first embodiment. The flowchart of FIG. 6 starts when the process of step S14 of the flowchart of FIG. 4 is performed. Next, the overdrying suppression operation will be described.

In step S101, the control unit 20 controls to increase the water supply flow rate to the humidifying element 5. Specifically, the control unit 20 transmits a control signal for increasing the opening degree of the water supply valve 7 to the water supply valve 7. The water supply valve 7 that has received the control signal has a larger opening than immediately before the overdrying suppression operation, and increases the water supply flow rate to the humidifying element 5 compared to immediately before the overdrying suppression operation. In step S101, the control unit 20 may be controlled to set the water supply flow rate selected in advance by the user or the manufacturer, or may be controlled to increase the water supply flow rate by a predetermined ratio or step, and determine the dry state. Control may be performed in which the unit 21 calculates the water supply flow rate that disappears in the dry state when the overdrying determination value fd is derived, and sets the calculated water supply flow rate. As an example, in the first embodiment, the control unit 20 controls so that the water supply flow rate becomes 100%.

After the process of step S101 is completed, the process proceeds to step S102. In step S102, the timer unit 22 resets the elapsed time t.

After the process of step S102 is completed, the process proceeds to step S103. In step S103, the timer unit 22 starts measuring the elapsed time t.

After the process of step S103 is completed, the process proceeds to step S104. In step S104, the timer unit 22 determines whether or not the elapsed time t has elapsed the time Ts for maintaining the overdrying suppression operation. Ts is stored in advance in the storage unit 28, and is a predetermined value such as 10 minutes.

When the timer unit 22 determines that the elapsed time t has not elapsed Ts (step S104, No), the timer unit 22 again determines in step S104. When the timer unit 22 determines that the elapsed time t has passed Ts (step S104, Yes), the overdrying suppression by controlling the water supply flow rate is terminated.

As described above, the humidifying device 100 according to the first embodiment has a control unit 20 that controls the water supply flow rate of the water supply means and the air volume of the blower, and the temperature and humidity acquired via the input interface 16 and the air volume of the blower 2. A dry state determination unit 21 for determining whether or not the humidifying element 5 is in an overdried state based on the water supply flow rate of the water supply means is provided, and the dry state determining unit 21 determines that the humidifying element 5 is in an overdried state. Then, the control unit is configured to perform an overdrying suppressing operation for suppressing the overdrying state of the humidifying element. This configuration has the effect of suppressing the humidifying element 5 from becoming overdried and suppressing the precipitation of scale on the humidifying element 5. In addition, since the scale is less likely to be deposited, it also has the effect of suppressing the generation of offensive odors and germs due to the scale.

Further, as an additional configuration, in the configuration of the humidifying device 100 according to the first embodiment described above, the control unit 20 maintains the overdrying suppression operation until a predetermined time Ts elapses from the start of the overdrying suppression operation. A configuration that controls the operation may be added. With this configuration, it is possible to prevent the humidifying device 100 from switching between normal operation and overdrying suppression operation in a short time, and it is possible to improve the stability of control.

Further, as an additional configuration, in the configuration of the humidifying device 100 according to the first embodiment described above, in the overdrying suppression operation, the control unit 20 controls to increase the water supply flow rate of the water supply means from immediately before the overdrying suppression operation. A configuration to be performed may be added. With this configuration, since the water supply flow rate increases in the overdrying suppression operation, the humidifying element 5 can be set to a condition in which scale is unlikely to precipitate.

Further, as an additional configuration, in the configuration of the humidifying device 100 according to the above-described first embodiment, the drying state determination unit 21 is a humidifying operation in which the water supply means supplies water to the humidifying element 5 and the blower 2 blows the air in the air passage 13. Occasionally, a configuration may be added to determine whether or not the humidifying element 5 is in an overdried state. With this configuration, it is possible to prevent the humidifying element from becoming overdried during the humidifying operation and precipitating scale.

Further, as an additional configuration, in the configuration of the humidifying device 100 according to the first embodiment described above, in the dry state determination unit 21, the water supply means does not supply water to the humidifying element 5, and the blower 2 blows the air in the air passage 13. A configuration may be added to determine whether or not the humidifying element 5 is in an overdried state during the drying operation. With this configuration, it is possible to prevent the humidifying element from becoming overdried during the drying operation and precipitating scale.

In the humidifying device 100 according to the first embodiment, the temperature sensor 3 and the humidity sensor 4 are arranged inside the main body casing 1, but the present invention is not limited to this. For example, the input interface 16 may be communicably connected to a temperature sensor for measuring the temperature or humidity of the humidified space and the humidity sensor, and the temperature or humidity of the humidified space may be acquired from the input interface. In this case, the temperature or humidity acquired from the input interface 16 corresponds to the temperature or humidity of the air passing through the air passage.

Further, in the humidifying device 100 according to the first embodiment, the storage unit 19 stores the formula of the number 1 as a method of deriving the overdrying determination value fd, and substitutes each numerical value into the formula to obtain the overdrying determination value fd. Is calculated, but it is not limited to this. For example, the storage unit 19 stores and acquires a table simulating the correlation of number 1 with the air volume Qa and the water supply volume Qw as rows or columns and the overdrying determination value fd as an element at each dry / wet ball temperature difference ΔT. The overdrying determination value fd may be derived by referring to the table and the air volume Qa and the water supply flow rate Qw.

Embodiment 2.
Next, the humidifying device 100 of the second embodiment will be described. The humidifying device 100 of the second embodiment is different from the humidifying device 100 of the first embodiment in controlling the overdrying suppression operation. The configuration and control of the humidifying device 100 of the second embodiment except for the control of the overdrying suppression operation are the same as the configuration and control of the humidifying device 100 of the first embodiment, and the description thereof will be omitted.

FIG. 7 is a flowchart of control of the overdrying suppression operation in the humidifying device according to the second embodiment. Since steps S202, S203, and S204 for controlling the overdrying suppression operation in FIG. 7 perform the same processing as steps S102, S103, and S104 for controlling the overdrying suppression operation in the first embodiment, the description thereof will be omitted. ..

In step S201, the control unit 20 reduces the amount of air passing through the humidifying element 5. Specifically, the control unit 20 transmits a control signal for reducing the air volume of the blower 2 to the blower 2. The blower 2 that has received the control signal reduces the air volume from immediately before the overdrying suppression operation, and reduces the air volume passing through the humidifying element 5 from immediately before the overdrying suppression operation. In step S201, the control unit 20 may be controlled to set the air volume to a pre-selected air volume by the user or the manufacturer, or may be controlled to reduce the air volume by a predetermined ratio or step, or the dry state determination unit 21. However, control may be performed in which the air volume that disappears in the over-dried state is calculated when the over-drying determination value fd is derived, and the air volume is set to the calculated air volume. As an example, in the first embodiment, the control unit 20 controls so that the air volume of the blower 2 becomes weak.

As described above, the humidifying device 100 of the second embodiment has the configuration of the humidifying device 100 according to the first embodiment as an additional configuration, and the control unit 20 in the overdrying suppressing operation starts immediately before the overdrying suppressing operation. Also has an additional configuration that controls to reduce the air volume of the blower 2. With this configuration, the air volume is reduced in the overdrying suppression operation, so that the humidifying element 5 can be set to a condition in which scale is unlikely to precipitate.

Further, the additional configuration shown in the second embodiment may be added to the configuration of the humidifying device 100 according to the first embodiment together with the other additional configurations shown in the first embodiment. In particular, the overdrying suppression operation for increasing the water supply flow rate in FIG. 6 shown in the first embodiment and the overdrying suppression operation for reducing the air volume in FIG. 7 shown in the second embodiment may be performed at the same time.

Embodiment 3.
Next, the humidifying device 101 of the third embodiment will be described. In the humidifying device 101 of the third embodiment, as compared with the humidifying device 100 of the first embodiment, the humidifying device 101 includes a temperature control coil 23, a method of deriving the overdrying determination value fd, and an overdrying suppression operation. Control is different. The configuration and control of the humidifying device 101 of the third embodiment excluding these are the same as the configuration and control of the humidifying device 100 of the first embodiment, and the description thereof will be omitted.

FIG. 8 is a schematic view showing the internal configuration of the humidifying device according to the third embodiment. FIG. 9 is a functional block diagram of the humidifying device of the humidifying device according to the third embodiment. Next, the humidifying device 101 of the third embodiment will be described.

The humidifying device 101 of the third embodiment includes a temperature control coil 23 that heats the passing air. The temperature control coil 23 is arranged inside the air passage 13, is arranged on the outlet 11 side of the temperature sensor 3 and the humidity sensor 4, and is arranged on the suction port 10 side of the humidifying element 5. Further, the temperature control coil 23 is configured so that the amount of heating can be controlled, for example, a condenser of a refrigeration cycle. The control unit 20 generates a control signal regarding the heating amount of the temperature control coil 23, and controls the temperature control coil. In the third embodiment, 100%, 75%, 50%, 25%, where the maximum heating amount that the temperature control coil 23 can heat is 100% and the heating amount in the state where the temperature control coil 23 is not heated is 0%. The heating amount can be controlled in 5 steps of 0%. Further, in the humidification operation of the second embodiment, the heating amount of the temperature control coil is controlled to any value from 100% to 25%, and in the drying operation of the second embodiment, the heating amount of the temperature control coil is controlled to 25%. Will be done.

Next, the flow of air inside the humidifying device 101 according to the third embodiment will be described. As the blower 2 operates, the suction air 14 flows into the air passage 13 from the suction port 10. The temperature sensor 3 detects the temperature of the suction air 14 that has flowed into the air passage 13. Further, the humidity sensor 4 detects the humidity of the suction air 14 that has flowed into the air passage 13. The suction air 14 passes through the blower 2 and heads for the temperature control coil 23.

The suction air 14 passes through the temperature control coil 23 and is heated. Here, the air heated by the temperature control coil 23 is referred to as the pre-humidification air 24. The pre-humidification air 24 passes through the humidification element 5 and is humidified. The humidified air 15 humidified by the humidifying element 5 flows out from the outlet 11 and is blown out to the humidified space again.

FIG. 10 is a flowchart for deriving the overdrying determination value fd in the humidifying device according to the third embodiment. The flowchart of FIG. 10 starts when the process of step S11 or step S14 of the flowchart of FIG. 4 is performed in the third embodiment. Here, a method for deriving the overdrying determination value fd performed by the drying state determination unit 21 according to the third embodiment will be described. Since steps S31, S32, S33, and S34 in FIG. 3 perform the same processing as steps S21, S22, S23, and S24 in FIG. 5 of the first embodiment, the description thereof will be omitted.

After the process of step S34 is completed, the process proceeds to step S35. In step S35, the dry state determination unit 21 derives the enthalpy H1 of the suction air 14 based on the dry-bulb temperature Td1 acquired in step S31 and the relative temperature φ1 acquired in step S32. In the method of deriving the enthalpy H1, the storage unit 19 stores a table simulating the correlation in the psychrometric chart with the dry-bulb temperature and the relative humidity as rows or columns and the enthalpy as an element, and the table was acquired in step S31. There is a method of deriving the enthalpy H1 by referring to the table with the dry-bulb temperature Td1 and the relative temperature φ1 acquired in step S32. Further, the storage unit 19 stores the approximate equation of the correlation in the psychrometric chart, and the dry-bulb temperature Td1 acquired in step S31 and the relative temperature φ1 acquired in step S32 are substituted into the equation to calculate the enthalpy H1. There is also a way to do it.

After the process of step S35 is completed, the process proceeds to step S36. In step S36, the dry state determination unit 21 derives the absolute humidity x1 of the suction air 14. Absolute humidity x1 stores a table or an approximate expression of the correlation that simulates the correlation in a psychrometric chart with the dry-bulb temperature and relative humidity as rows or columns and the absolute humidity as elements, similar to the method for deriving the enthalpy H1. There is a method of deriving the absolute humidity x1 by referring to the table or substituting the dry-bulb temperature Td1 acquired in step S31 and the relative humidity φ1 acquired in step S32 into the table or an approximate expression stored in the unit 19.

After the process of step S36 is completed, the process proceeds to step S37. In step S37, the enthalpy H2 of the pre-humidifying air 24 is derived. Specifically, it is derived by the formula shown in Equation 2. Here, the symbol used in Equation 2 is defined. Qh is the heating amount (unit: W) of the temperature control coil 23. Since the heating amount of the temperature control coil is controlled by the control unit 20, it is determined by referring to the control value of the heating amount Qh or the control value related to the heating amount Qh. As an example, in the first embodiment, the storage unit 19 stores the heating amount Qh when the heating amount is 100%, 75%, 50%, 25%, and 0%, respectively, and the dry state determination unit 21 stores the heating amount Qh. The heating amount Qh in the heating amount controlled by the control unit 20 is acquired from the storage unit 19. ρa is the density of air (unit: kg / m ³ ). ρa is a constant, and the value of ρa is stored in the storage unit 19. Qa is the air volume (unit is m ³ / s). Qa uses the value derived in step S33.

After the process of step S37 is completed, the process proceeds to step S38. In step S38, the dry state determination unit 21 derives the dry / wet ball temperature difference ΔT of the pre-humidifying air 24. Since the absolute humidity does not fluctuate in the temperature control coil 23, the absolute humidity of the pre-humidification air 24 is the same as the absolute humidity x1 of the suction air 14. Therefore, the dry-bulb temperature Td2 of the pre-humidified air 24 and the wet-bulb temperature Tw2 of the pre-humidified air 24 are in a psychrometric chart in which the enthalpy and the absolute humidity are rows or columns, respectively, and the dry-bulb temperature or the wet-bulb temperature is an element. It can be derived based on a table simulating the correlation or an approximate expression of the correlation. By subtracting the dry-bulb temperature Tw2 of the pre-humidifying air 24 from the derived dry-bulb temperature Td2 of the pre-humidifying air 24, the dry-bulb temperature difference ΔT of the pre-humidifying air 24 can be derived.

After the process of step S38 is completed, the process proceeds to step S39. In step S39, the dry state determination unit 21 determines the overdrying determination value fd from the air volume Qa derived in step S33, the water supply flow rate Qw derived in step S34, and the dry / wet ball temperature difference ΔT of the pre-humidifying air 24 derived in step S38. Is derived. Since the derivation of the overdrying determination value fd is the same as in step S27 of the first embodiment, the description thereof will be omitted.

After the processing in step S39 is completed, the drying state determination unit 21 ends the derivation of the overdrying determination value fd.

FIG. 11 is a flowchart of control of the overdrying suppression operation in the humidifying device according to the third embodiment. Next, the control of the overdrying suppression operation of the humidifying device 101 of the third embodiment will be described. The steps S302, S303, and S304 for controlling the overdrying suppression operation by controlling the heating amount perform the same processing as the steps S102, S103, and S104 for controlling the overdrying suppression operation according to the first embodiment. Omit.

In step S301, the control unit 20 reduces the heating amount of the temperature control coil 23. Specifically, the control unit 20 transmits a control signal for reducing the heating amount of the temperature control coil 23 to the temperature control coil 23, so that the temperature control coil 23 reduces the heating amount. In step S301, the control unit 20 may be controlled to set the heating amount set in advance by the user or the manufacturer, or may be controlled to reduce the heating amount by a predetermined ratio or step, and determine the dry state. Control may be performed in which the unit 21 calculates the heating amount that disappears in the dry state when the overdrying determination value fd is derived, and sets the heating amount to the calculated heating amount. As an example, in the first embodiment, the control unit 20 controls so that the heating amount becomes 0%.

As described above, the humidifying device 101 of the third embodiment includes the temperature control coil 23 for heating the air blown to the humidifying element 5 in the configuration of the humidifying device 100 according to the first embodiment as an additional configuration. , The control unit 20 controls the heating amount of the temperature control coil 38, and in the overdrying suppression operation, the control unit 20 is added with a configuration in which the heating amount of the temperature control coil 23 is reduced compared to immediately before the overdrying suppression operation is performed. There is. With this configuration, since the heating amount of the temperature control coil 23 is reduced in the overdrying suppression operation, the temperature difference ΔT of the wet and dry bulbs becomes small, and the humidifying element 5 can be set to a condition in which scale is less likely to precipitate.

Further, the additional configuration shown in the third embodiment may be added to the configuration of the humidifying device 100 according to the first embodiment together with the other additional configurations shown in the first or second embodiment. In particular, in the third embodiment, one or both of the overdrying suppression operation for increasing the water supply flow rate in FIG. 6 shown in the first embodiment and the overdrying suppression operation for reducing the air volume in FIG. 7 shown in the second embodiment are performed. It may be performed at the same time as the overdrying suppression operation by reducing the heating amount of the temperature control coil shown in FIG.

The humidifying device 101 of the third embodiment derives the dry-wet ball temperature difference ΔT of the pre-humidifying air 24 from the temperature and humidity of the sucked air 14, but is not limited to this. For example, the temperature sensor and the humidity sensor are arranged on the outlet 11 side of the temperature control coil 23 and on the suction port 10 side of the humidification element 5, and the temperature and humidity of the pre-humidification air 24 are directly measured to measure the temperature and humidity of the wet ball. The difference ΔT may be derived.

Further, the overdrying determination value fd may be derived by using the dry / wet ball temperature difference ΔT of the sucked air 14 without deriving the dry / wet ball temperature difference ΔT of the pre-humidifying air 24. In this case, in steps S12 and S15 of FIG. 4, it is determined whether or not the value obtained by adding the predetermined margin α to the overdrying determination value fd is larger than the overdrying determination threshold value ε (fd + α> ε). The reason for adding the margin α is that the air before humidification 24 is the air in which the suction air 14 is heated by the temperature control coil 23. This is because the overdrying determination value fd in the pre-humidification air 24 is larger than the overdrying determination value fd in the suction air 14. The margin α may be an experimentally obtained constant or a function proportional to the heating amount of the temperature control coil 23.

Embodiment 4.
FIG. 12 is a schematic view showing an internal configuration when the bypass air passage of the ventilation device according to the fourth embodiment is closed. FIG. 13 is a schematic view showing an internal configuration when the bypass air passage of the ventilation device according to the fourth embodiment is opened. The ventilation device 200 includes a main body casing 30, a heat exchanger 31, an air supply blower 32, an exhaust blower 33, an air supply temperature sensor 34, an air supply humidity sensor 35, an exhaust temperature sensor 36, and an exhaust humidity sensor. It includes 37, a temperature control coil 38, a humidifying element 39, a water supply pipe 40, a water supply valve 41, a damper 42, a control device 43, and an operation terminal 44.

The main body casing 30 is a member that forms the exterior of the ventilation device 200. The main body casing 1 includes a heat exchanger 31, an air supply blower 32, an exhaust blower 33, an air supply temperature sensor 34, an air supply humidity sensor 35, an exhaust temperature sensor 36, an exhaust humidity sensor 37, and a temperature control coil. 38, a humidifying element 39, a water supply pipe 40, a water supply valve 41, a damper 42, and a control device 43 are housed. A supply air suction port 45, a supply air outlet 46, an exhaust suction port 47, an exhaust air outlet 48, and a water supply pipe connection port 49 are formed on the outer surface of the main body casing 1. The air supply outlet 46 and the exhaust suction port 47 are connected to a ventilation space, which is a space where the ventilation device 200 ventilates. The air supply inlet 45 and the exhaust outlet 48 are connected to other spaces different from the ventilation space such as outdoors. The water supply pipe connection port 49 is connected to a water supply source such as water supply.

Further, the supply air suction port 45 and the supply air outlet 46 are communicated with each other by the supply air passage 50 formed inside the main body casing 30. The exhaust suction port 47 and the exhaust outlet 48 are communicated with each other by an exhaust air passage 51 formed inside the main body casing 30. A bypass air passage 52 is formed in a part of the exhaust air passage 51 so as to bypass the second air passage of the heat exchanger 31, which will be described later.

The heat exchanger 31 has a first air passage and a second air passage inside, and the air flowing in the first air passage and the air flowing in the second air passage exchange heat and moisture. It is configured. When the heat exchanger 31 is housed in the ventilator 200, the first air passage forms a part of the air supply air passage 50, and the second air passage forms a part of the exhaust air passage 51.

The supply air blower 32 is a device that blows the air inside the supply air passage 50 from the supply air suction port 45 side to the supply air outlet 46 side. The air supply blower 32 is arranged inside the air supply air passage 50. Further, the exhaust blower 33 is a device that blows the air inside the exhaust air passage 51 from the exhaust suction port 47 side to the exhaust outlet 48 side. The exhaust blower 33 is arranged inside the exhaust air passage 51. The air supply blower 32 and the exhaust blower 33 are configured to be able to control the air volume, for example, by being composed of a fan and a motor capable of controlling the rotation speed. In the fourth embodiment, the air supply blower 32 and the exhaust blower 33 can be controlled in three stages of strong, medium, and weak in descending order of air volume.

The supply air temperature sensor 34 and the exhaust temperature sensor 36 are elements capable of detecting the temperature, and the supply air humidity sensor 35 and the exhaust humidity sensor 37 are elements capable of detecting the humidity. The supply air temperature sensor 34 and the supply air humidity sensor 35 are arranged inside the supply air passage 50, and are arranged closer to the supply air suction port 45 than the first air passage of the heat exchanger 31. The exhaust temperature sensor 36 and the exhaust humidity sensor 37 are arranged inside the exhaust air passage 51, and are arranged on the exhaust suction port 47 side of the second air passage and the bypass air passage 52 of the heat exchanger 31.

The temperature control coil 38 is a member that heats the passing air. The temperature control coil 38 is arranged inside the air supply air passage 50, and is arranged on the air supply outlet 46 side of the first air passage of the heat exchanger 31. Further, the temperature control coil 38 is configured so that the amount of heating can be controlled, for example, a condenser of a refrigeration cycle. In the fourth embodiment, 100%, 75%, 50%, 25%, where the maximum heating amount that the temperature control coil 38 can heat is 100% and the heating amount in the state where the temperature control coil 38 is not operating is 0%. The heating amount can be controlled in 5 steps of 0%.

The humidifying element 39 is a member that humidifies the passing air. For example, a filter containing water is used as the humidifying element 39. The humidifying element 39 is arranged inside the air supply air passage 50, and is arranged on the air supply outlet 46 side of the temperature control coil 38.

The water supply pipe 40 is a pipe that connects the humidifying element 39 and the water supply pipe connection port 49. The humidifying element 39 is supplied with water from the water source via the water supply pipe 40 and the water supply pipe connection port 49.

The water supply valve 41 is a valve that adjusts the water supply flow rate of the humidifying element 39. The water supply valve 41 is arranged in the middle of the water supply pipe 40. The water supply valve 41 is configured to be able to control the water supply flow rate of the humidifying element 39, for example, a two-way valve capable of controlling the opening degree of the valve. In the fourth embodiment, the state where the valve is fully open is 100% and the state where the valve is fully closed is 0%, and the water supply flow rate can be controlled in five stages of 100%, 75%, 50%, 25%, and 0%. ..

The damper 42 is a member for switching whether the bypass air passage 52 is opened or closed. The damper 42 is arranged inside the exhaust air passage 51. The damper 42 is located at a position where the second air passage of the heat exchanger 31 is opened and the bypass air passage 52 is closed as shown in FIG. 12 by an actuator such as a motor, and the second air passage of the heat exchanger 31 is closed as shown in FIG. It is configured to be movable from the position where the air passage 2 is closed and the bypass air passage 52 is opened.

The control device 43 is based on the temperature detected by the supply air temperature sensor 34 and the exhaust temperature sensor 36 and the humidity detected by the supply air humidity sensor 35 and the exhaust humidity sensor 37, and the air volume and temperature of the supply air blower 32 and the exhaust blower 33. The heating amount of the adjusting coil 38 and the flow rate of water supplied to the humidifying element 39 are controlled.

The operation terminal 44 is at least a terminal for the user to perform an operation related to the start of the operation of the ventilation device 200 and the stop of the operation of the ventilation device 200. The operation terminal 44 corresponds to, for example, a remote controller, a computer in which an application for operation is installed, a tablet terminal, a smartphone, or the like.

Next, the air flow inside the ventilation device 200 according to the fourth embodiment will be described. First, the air flow of the air supply air passage 50 will be described. By operating the air supply blower 32, air in a space other than the ventilation space flows into the inside of the ventilation device 200 from the air supply suction port 45. The air flowing in from the supply air suction port 45 is referred to as a supply air suction air 53.

The supply air suction air 53 flows into the supply air passage 50. The supply air temperature sensor 34 detects the temperature of the supply air suction air 53 that has flowed into the supply air passage 50. Further, the supply air humidity sensor 35 detects the humidity of the supply air suction air 53 flowing into the supply air passage 50.

The supply air suction air 53 whose temperature and humidity are detected by the supply air temperature sensor 34 and the supply air humidity sensor 35 passes through the first air passage of the heat exchanger 31. The air passing through the first air passage of the heat exchanger 31 is referred to as supply air heat exchange air 54. When the exhaust heat exchange air 58 described later is flowing in the second air passage of the heat exchanger 31, the supply air heat exchange air 54 is a heat exchanger while exchanging heat and moisture with the exhaust heat exchange air 58. It passes through the first air passage of 31. Further, when the exhaust heat exchange air 58 does not flow in the second air passage of the heat exchanger 31, the supply air heat exchange air 54 does not exchange heat and moisture, and the first heat exchanger 31 does not exchange heat and moisture. Pass through the air passage.

The supply air heat exchange air 54 that has passed through the first air passage of the heat exchanger 31 passes through the temperature control coil 38 and is heated after passing through the supply air blower 32. Here, the air that has passed through the temperature control coil 38 and has not passed through the humidifying element 39 is referred to as an air supply before humidification air 55.

The air 55 before supply air humidification passes through the humidification element 39 and is humidified. Here, the air humidified by the humidifying element 39 is referred to as air after supply and humidification 56. After the air supply and humidification, the air 56 flows out from the supply air outlet 46 and is blown out into the ventilation space.

Next, the flow of air in the exhaust air passage 51 will be described. When the exhaust blower 33 operates, the air in the ventilation space flows into the inside of the ventilation device 200 from the exhaust suction port 47. The air flowing in from the exhaust suction port 47 is referred to as an exhaust suction air 57.

The exhaust suction air 57 flows into the exhaust air passage 51. The exhaust temperature sensor 36 detects the temperature of the exhaust suction air 57 that has flowed into the exhaust air passage 51. Further, the exhaust humidity sensor 37 detects the humidity of the exhaust suction air 57 flowing into the exhaust air passage 51.

When the damper 42 is in a position where the second air passage of the heat exchanger 31 is opened and the bypass air passage 52 is closed as shown in FIG. 12, the temperature and humidity are detected by the exhaust temperature sensor 36 and the exhaust humidity sensor 37. The exhausted suction air 57 passes through the second air passage of the heat exchanger 31. The air passing through the second air passage of the heat exchanger 31 is referred to as exhaust heat exchange air 58. The exhaust heat exchange air 58 passes through the second air passage of the heat exchanger 31 while exchanging heat and moisture with the supply air heat exchange air 54.

When the damper 42 is in a position where the second air passage of the heat exchanger 31 is blocked and the bypass air passage 52 is released as shown in FIG. 13, the temperature and humidity are measured by the supply air temperature sensor 34 and the supply air humidity sensor 35. The exhaust suction air 57 detected above passes through the bypass air passage 52. The air passing through the bypass air passage 52 is referred to as an exhaust bypass passing air 60. The exhaust bypass passing air 60 passes through the bypass air passage 52 without exchanging heat and moisture with the supply air heat exchange air 54.

The exhaust heat exchange air 58 that has passed through the second air passage of the heat exchanger 31 and the exhaust bypass passing air 60 that has passed through the bypass air passage 52 flow out from the exhaust outlet 48 after passing through the exhaust blower 33 and ventilate. It is blown out to another space different from the space. The air flowing out from the exhaust outlet 48 is referred to as an exhaust blown air 59.

FIG. 14 is a functional block diagram of the ventilation device according to the fourth embodiment. Next, a functional block diagram of the ventilation device 200 according to the fourth embodiment will be described. The control device 43 includes an input interface 61, an output interface 62, and a microcomputer 63.

The input interface 61 is communicably connected to the supply air temperature sensor 34, the supply air humidity sensor 35, the exhaust temperature sensor 36, and the exhaust humidity sensor 37, and provides information on the temperature detected by the supply air temperature sensor 34 and the supply air humidity. Information on the humidity detected by the sensor 35, information on the temperature detected by the exhaust temperature sensor 36, and information on the humidity detected by the exhaust humidity sensor 37 are received, respectively. The output interface 62 is communicably connected to the air supply blower 32, the exhaust blower 33, the temperature control coil 38, the water supply valve 41, and the damper 42, and is related to the control signal regarding the air volume of the air supply blower 32 and the air volume of the exhaust blower 33. A control signal, a control signal regarding the heating amount of the temperature control coil 38, a control signal regarding the opening degree of the water supply valve 41, and a control signal regarding the position of the damper 42 are transmitted.

The microcomputer 63 has the functions of a storage unit 64, a control unit 65, a dry state determination unit 66, and a timer unit 67. Further, the microcomputer 63 includes a processor, a memory, and a timer as in the microcomputer 18 of the first embodiment.

The storage unit 64 contains a software program executed by the processor, the air volume of the air supply blower 32, the air volume of the exhaust blower 33, the heating amount of the temperature control coil 38, the opening degree of the water supply valve 41, and the damper 42. It stores the numerical values used to control each position. The storage unit 64 is realized by storing a program and various numerical values in the memory.

The control unit 65 generates control signals regarding the air volume of the air supply blower 32, the air volume of the exhaust blower 33, the heating amount of the temperature control coil 38, the opening degree of the water supply valve 41, and the position of the damper 42. , The air supply blower 32, the exhaust blower 33, the temperature control coil 38, the water supply valve 41, and the damper 42 are controlled. Further, the dry state determination unit 66 determines whether or not the humidifying element 39 is in a dry state. The control unit 65 and the dry state determination unit 66 are realized by the processor executing processing according to a software program stored in the memory.

The timer unit 67 measures the elapsed time. The timer unit 67 is realized by a timer.

Next, an example of the normal operation of the ventilation device according to the fourth embodiment will be described. The normal operation in the present invention is not limited to the example described below, and refers to an operation excluding the overdrying suppression operation described later. FIG. 15 is a flowchart showing an example of control of normal operation of the ventilation device according to the fourth embodiment. The control of the flowchart of FIG. 15 starts when the user performs an operation of starting the operation of the ventilation device 200 from the operation terminal 44.

In step S1a, the timer unit 67 resets the humidification operation time ta.

After the process of step S1a is completed, the process proceeds to step S2a. In step S2a, the timer unit 67 starts measuring the humidification operation time ta.

After the process of step S2a is completed, the process proceeds to step S3a. In step S3a, the control unit 65 controls the ventilation device 200 to perform the humidification ventilation operation. The humidified ventilation operation is an operation in which the air in the ventilation space is exhausted and the air in another space different from the ventilation space is humidified and supplied. For example, in the humidification / ventilation operation, the control unit 65 opens the water supply valve 41 to supply water to the humidification element 39, operates the supply air blower 32 and the exhaust blower 33, and controls to heat the temperature control coil 38. In the humidified ventilation operation in the fourth embodiment, the supply air volume is medium, the exhaust air volume is medium, the supply water flow rate is 75%, the heating amount of the temperature control coil 38 is any value of 100% to 25%, and the position of the damper 42. Is controlled to either a position where the bypass air passage 52 is closed or a position where the bypass air passage 52 is opened.

After the process of step S3a is completed, the process proceeds to step S4a. In step S4a, the control unit 65 determines whether or not the user has performed an operation to stop the operation of the ventilation device 200 from the operation terminal 44.

When the control unit 65 determines that the user has performed an operation to stop the operation of the ventilation device 200 from the operation terminal 44 (step S4a, YES), the process proceeds to step S5a. In step S5a, the control unit 65 controls the ventilation device 200 to perform the drying operation for a predetermined time. For example, in the drying operation, the control unit 65 closes the water supply valve 41 to stop the water supply to the humidifying element 39, operates the air supply blower 32 and the exhaust blower 33, and controls to heat the temperature control coil 38. .. In the drying operation according to the fourth embodiment, the supply air volume is strong, the exhaust air volume is strong, the water supply flow rate is 0%, the heating amount of the temperature control coil 38 is 25%, and the position of the damper 42 is a position that closes the bypass air passage 52. Is controlled by.

After the process of step S5a is completed, the process proceeds to step S6a. In step S6a, the control unit 65 stops the operation of the ventilation device 200. When the operation is stopped, the water supply valve 41 is closed to stop the water supply to the humidifying element 39, and the air supply blower 32, the exhaust blower 33, and the temperature control coil 38 are stopped. After the processing of step S6a is completed, the normal operation of the ventilation device 200 is terminated.

If the control unit 20 determines that the user has not performed an operation to stop the operation of the ventilation device 200 from the operation terminal 44 (step S4a, NO), the process proceeds to step S7a. In step S7a, the timer unit 67 determines whether or not the humidification operation time ta is larger than the predetermined drying operation start time ts.

When the timer unit 67 determines that the humidification operation time ta is larger than the drying operation start time ts (step S7a, YES), the timer unit 67 proceeds to step S8a. In step S8a, the control unit 65 controls the ventilation device 200 to perform the drying operation for a predetermined time. The drying operation in step S8a is the same as the drying operation described in step S5a, and the description thereof will be omitted. After the end of step S8a, the process proceeds to step S1a, and the timer unit 67 resets the humidification operation time ta.

When the timer unit 67 determines that the humidification operation time ta is equal to or less than the drying operation start time ts (steps S7a, NO), the process proceeds to step S4a, and the user again operates the ventilation device 200 from the operation terminal 44 in the control unit 65. Judge whether or not the operation to stop is performed.

Next, the control for suppressing the overdrying state of the humidifying element 39 of the ventilation device 200 according to the fourth embodiment will be described. Since the flow chart of the control is different only in the main body of each process as compared with the flow chart of the control for suppressing the overdrying state of the humidifying device 100 according to the first embodiment, it will be described with reference to the flowchart of FIG. .. The control of the flowchart of FIG. 4 is started when the user operates the ventilation device 200 from the operation terminal 44 to start the operation. That is, the control of the flowchart of FIG. 15 and the control of the flowchart of FIG. 4 are performed at the same time.

In step S11, the dry state determination unit 66 derives the overdrying determination value fd. Details of the derivation of the overdrying determination value fd in the ventilation device 200 of the fourth embodiment will be described later.

After the process of step S11 is completed, the process proceeds to step S12. In step S12, the dry state determination unit 66 determines whether or not the overdry determination value fd derived in step S11 is larger than the overdry determination threshold value ε. The overdrying determination threshold value ε is a predetermined constant and is stored in the storage unit 64.

If the dry state determination unit 66 determines in step S12 that the overdrying determination value fd is larger than the overdrying determination threshold value ε (steps S12, Yes), the process proceeds to step S13. In step S13, the control unit 65 stops the control of the normal operation in the flowchart of FIG. That is, when the ventilation device 200 is performing the humidification ventilation operation or the drying operation, those operations are stopped.

After the process of step S13 is completed, the process proceeds to step S14. In step S14, the control unit 65 controls the ventilation device 200 to perform the overdrying suppression operation. The details of the overdrying suppression operation in the ventilation device 200 of the fourth embodiment will be described later.

After the process of step S14 is completed, the process proceeds to step S15. In step S15, the dry state determination unit 66 derives the overdrying determination value fd as in step S11.

After the process of step S15 is completed, the process proceeds to step S16. In step S16, the dry state determination unit 66 determines whether or not the overdry determination value fd derived in step S15 is larger than the overdry determination threshold value ε.

When the dry state determination unit 66 determines in step S16 that the overdry determination value fd is larger than the overdry determination threshold value ε (steps S16, Yes), the process proceeds to step S14, and the overdry suppression operation is performed again.

When the dry state determination unit 66 determines that the overdrying determination value fd is equal to or less than the overdrying determination threshold value ε in step S16 (steps S16, No), the process proceeds to step S17. In step S17, the control unit 65 controls the ventilation device 200 to restart the normal operation.

After the processing of step S17 is completed, or when the overdrying determination value fd is equal to or less than the overdrying determination threshold value ε in step S12 (step S12, No), the process proceeds to step S18. In step S18, the dry state determination unit 66 determines whether the control unit 65 has stopped the operation of the ventilation device 200.

When the dry state determination unit 66 determines that the control unit 65 has stopped the operation of the ventilation device 200 in step S18 (step S18, Yes), the control for suppressing the overdry state of the humidifying element 39 is terminated. When the dry state determination unit 66 determines in step S18 that the operation of the ventilation device 200 has not been stopped (steps S18, No), the process proceeds to step S11, and the dry state determination unit 66 determines the overdrying determination value fd. Is derived.

FIG. 16 is a flowchart for deriving the overdrying determination value fd in the ventilation device according to the fourth embodiment. The flowchart of FIG. 16 starts when the process of step S11 or step S14 of the flowchart of FIG. 4 is performed. Here, a method for deriving the overdrying determination value fd performed by the drying state determination unit 66 will be described.

In step S41, the dry state determination unit 66 acquires the temperature detected by the supply air temperature sensor 34 as the dry-bulb temperature Tdoa of the supply air suction air 53 via the input interface 61.

After the process of step S41 is completed, the process proceeds to step S42. In step S42, the dry state determination unit 66 acquires the humidity detected by the supply air / humidity sensor 35 as the relative humidity φoa of the supply air suction air 53 via the input interface 61.

After the process of step S42 is completed, the process proceeds to step S43. In step S43, the dry state determination unit 66 derives the supply air volume Qoa. Since the supply air volume Qoa is controlled by the control unit 65, the supply air volume Qoa is derived by referring to the control value related to the supply air volume Qoa in the same manner as in step S23 of FIG.

After the process of step S43 is completed, the process proceeds to step S44. In step S44, the dry state determination unit 66 derives the water supply flow rate Qw supplied to the humidifying element 39. Since the water supply flow rate Qw is controlled by the control unit 65, the water supply flow rate Qw is derived by referring to the control value related to the water supply flow rate Qw in the same manner as in step S24 of FIG.

After the process of step S44 is completed, the process proceeds to step S45. In step S45, the dry state determination unit 66 derives the enthalpy Hoa of the supply air suction air 53. Similar to step S35 in FIG. 10, the enthalpy Hoa has a table or an approximate expression of the correlation in which the dry-bulb temperature and the relative humidity are used in rows or columns and the enthalpy is used as an element in the psychrometric chart or the approximate expression of the correlation is stored in the storage unit 19. There is a method of deriving the enthalpy Hoa by substituting the dry-bulb temperature Tdoa acquired in step S41 and the relative humidity φoa acquired in step S42 into a table or an approximate expression.

After the process of step S45 is completed, the process proceeds to step S46. In step S46, the dry state determination unit 66 determines whether or not the damper 42 is blocking the bypass air passage 52. Since the position of the damper 42 is controlled by the control unit 65, the dry state determination unit 66 acquires information on the position of the damper 42 from the control unit 65 and makes a determination.

If the dry state determination unit 66 determines in step S46 that the damper 42 is blocking the bypass air passage 52 (steps S46, Yes), the process proceeds to step S47. In step S47, the dry state determination unit 66 acquires the temperature detected by the exhaust temperature sensor 36 as the dry-bulb temperature Tdra of the exhaust suction air 57 via the input interface 61.

After the process of step S47 is completed, the process proceeds to step S48. In step S48, the dry state determination unit 66 acquires the humidity detected by the exhaust humidity sensor 37 as the relative humidity φra of the exhaust suction air 57 via the input interface 61.

After the process of step S48 is completed, the process proceeds to step S49. In step S49, the dry state determination unit 66 derives the enthalpy Hra of the exhaust suction air 57. In the enthalpy Hra, the storage unit 64 stores a table simulating the correlation in a psychrometric diagram having the dry-bulb temperature and the relative humidity as rows or columns and the enthalpy as an element, or an approximate expression of the correlation, as in step S45. There is a method of deriving the enthalpy Hra by substituting the dry-bulb temperature Tdra acquired in step S47 and the relative humidity φra acquired in step S48 into a table or an approximate expression.

After the process of step S49 is completed, the process proceeds to step S50. In step S50, the dry state determination unit 66 derives the exhaust air volume Qra. Since the exhaust air volume Qra is controlled by the control unit 65, the exhaust air volume Qra is derived by referring to the control value related to the exhaust air volume Qra as in step S44.

After the process of step S50 is completed, the process proceeds to step S51. In step S51, the dry state determination unit 66 derives the dry-bulb temperature Tdoa2 of the supply air heat exchange air 54. Specifically, it is derived by the formula shown in Equation 3. Here, the symbol used for the number 3 is defined. ηt is the temperature exchange efficiency (unit is dimensionless) of the heat exchanger 31. The temperature exchange efficiency ηt has a correlation with the supply air volume Qoa and the exhaust air volume Qra, and the correlation is determined by the type of the heat exchanger 31. The storage unit 64 stores a table or an approximate expression simulating a correlation in which the supply air volume Qoa and the exhaust air volume Qra are rows or columns and the temperature exchange efficiency ηt is an element, and is combined with the supply air volume Qoa derived in step S43. The temperature exchange efficiency ηt is determined by substituting the exhaust air volume Qra derived in step S50 into a table or an approximate expression. As for the temperature exchange efficiency ηt, the temperature exchange efficiency ηt decreases as the supply air volume Qoa increases, and the temperature exchange efficiency ηt increases as the exhaust air volume Qra increases.

After the process of step S51 is completed, the process proceeds to step S52. In step S52, the dry state determination unit 66 derives the enthalpy Hoa2 of the supply air heat exchange air 54. Specifically, it is derived by the formula shown in Equation 4. Here, the symbol used for the number 4 is defined. ηh is the enthalpy exchange efficiency (unit is dimensionless) of the heat exchanger 31. Like the temperature exchange efficiency ηt, the enthalpy exchange efficiency ηh also has a correlation with the supply air volume Qoa and the exhaust air volume Qra, and the correlation is determined by the type of the heat exchanger 31. Therefore, the storage unit 64 stores a table or an approximate expression simulating the correlation between the enthalpy exchange efficiency ηh, the supply air volume Qoa, and the exhaust air volume Qra, and derives the supply air volume Qoa derived in step S43 and the exhaust air volume Qra in step S50. The enthalpy exchange efficiency ηh is determined by substituting the exhaust air volume Qra into a table or an approximate expression. As for the enthalpy exchange efficiency ηt, the enthalpy exchange efficiency ηh decreases as the supply air volume Qoa increases, and the enthalpy exchange efficiency ηh increases as the exhaust air volume Qra increases.

After the processing of step S52 is completed, and when the dry state determination unit 66 determines that the damper 42 does not block the bypass air passage 52 in step S46 (step S46, No), the process proceeds to step S53. In step S53, the dry state determination unit 66 derives the absolute humidity xoa2 of the supply air heat exchange air 54. Specifically, the storage unit 64 stores a table simulating the correlation with the dry-bulb temperature and the enthalpy as rows or columns and the absolute humidity as an element in the psychrometric chart, or the approximate expression of the correlation, and supplies air. The absolute humidity xoa2 is derived by substituting the dry-bulb temperature and enthalpy of the heat exchange air 54 into a table or an approximate expression. Here, when the dry state determination unit 66 determines in step S46 that the damper 42 is blocking the bypass air passage 52 (step S46, Yes), the supply air heat exchange air 54 heats with the exhaust heat exchange air 58. In addition, since the water is exchanged, the dry state determination unit substitutes the dry-bulb temperature Tdoa2 derived in step S51 and the enthalpy Hoa2 derived in step S52 into the table or an approximate expression. Further, when the dry state determination unit 66 does not determine in step S46 that the damper 42 is blocking the bypass air passage 52 (step S46, No), the supply air heat exchange air 54 exchanges heat and moisture. The dry-bulb temperature Tdoa acquired in step S41 and the enthalpy Hoa derived in step S45 are referred to the table or substituted into the approximate expression.

After the process of step S53 is completed, the process proceeds to step S54. In step S54, the enthalpy Hoa3 of the air 55 before air supply / humidification is derived. Specifically, when the dry state determination unit 66 determines that the damper 42 is blocking the bypass air passage 52 in step S46 (step S46, Yes), it is derived by the formula shown in Equation 5, and the damper is derived in step S46. When the dry state determination unit 66 determines that the 42 does not block the bypass air passage 52 (step S46, No), it is derived by the formula shown in Equation 6. Define the symbols used in numbers 5 and 6. Qh is the heating amount of the temperature control coil 38 (unit is W). Since the heating amount of the temperature control coil is controlled by the control unit 65, it is determined by referring to the control value of the heating amount Qh or the control value related to the heating amount Qh. ρa is the density of air (unit: kg / m ³ ). ρa is a constant, and the value of ρa is stored in the storage unit 64. Qoa is the air supply air volume (unit: m ³ / s). Qa uses the value derived in step S42.

After the process of step S54 is completed, the process proceeds to step S55. In step S55, the dry state determination unit 66 derives the dry / wet ball temperature difference ΔT of the air before supply / humidification. The dry-bulb temperature of the air before supply / humidification 55 and the wet-bulb temperature of the air 55 before supply / humidification have the enthalpy and absolute humidity stored in the storage unit 64 as rows or columns, respectively, and the dry-bulb temperature or the wet-bulb temperature is set. It is derived by referring to or substituting the enthalpy Hoa3 derived in step S54 and the absolute humidity xoa2 derived in step S53 into a table simulating the correlation in the psychrometric chart as an element or an approximate expression of the correlation. By subtracting the dry-bulb temperature of the pre-humidifying air 24 from the derived dry-bulb temperature of the pre-humidifying air 24, the dry-bulb temperature difference ΔT of the air supply before humidification can be derived.

After the end of step S55, the process proceeds to step S56. In step S56, the dry state determination unit 66 sets the air supply air volume Qoa derived in step S43, the water supply flow rate Qw derived in step S44, and the dry / wet ball temperature difference ΔT of the air supply / humidification pre-humidification air 55 derived in step S55. The overdrying determination value fd is derived. As a method for deriving the overdrying determination value fd, there is a method in which the storage unit 64 stores the equation of the equation 7 and substitutes each numerical value into the equation to calculate the fd, as in step S27 of FIG. ..

The number 7 f (ΔT, Qoa, Qw) is a function determined by three variables of the dry / wet ball temperature difference ΔT, the supply air volume Qoa, and the supply water flow rate Qw. The function f is experimentally derived by the same method as in Equation 1.

Further, the function f satisfies the relationship that the overdrying determination value fd increases as the dry / wet ball temperature difference ΔT increases. Further, the function f satisfies the relationship that the overdrying determination value fd increases as the supply air volume Qoa increases. Further, the function f satisfies the relationship that the overdrying determination value fd decreases as the water supply flow rate Qw increases.

After the processing in step S56 is completed, the drying state determination unit 66 ends the derivation of the overdrying determination value fd.

FIG. 17 is a flowchart of control of the overdrying suppression operation in the ventilation device according to the fourth embodiment. Next, the control of the overdrying suppression operation in the fourth embodiment will be described. The steps S402, S403, and S404 for controlling the overdrying suppression operation in the fourth embodiment are mainly from the timer unit 22 as compared with the steps S102, S103, and S104 for controlling the overdrying suppression operation in the first embodiment. Only the point changed to the timer unit 67 is different, and the control contents are the same, so the explanation is omitted.

In step S401, the control unit 65 opens the second air passage of the heat exchanger 31 and closes the bypass air passage 52. Specifically, the control unit 65 opens the second air passage of the heat exchanger 31 to the damper 42 and transmits the control signal to move the bypass air passage 52 to a position where the bypass air passage 52 is closed, so that the second air passage of the heat exchanger 31 can be closed. The air passage of No. 2 is opened and the bypass air passage 52 is closed.

As described above, the ventilation device 200 according to the fourth embodiment has a control unit 65 that controls the water supply flow rate of the water supply means and the air volume of the air supply air blower 32, and the temperature, humidity, and air supply acquired via the input interface 61. The dry state determination unit 66 includes a dry state determination unit 66 that determines whether or not the humidifying element 39 is in an overdrying state based on the air volume of the blower 32 and the water supply flow rate of the water supply means. When it is determined that the state is in a state, the control unit 65 is configured to control the humidifying element 39 to perform an overdrying suppressing operation for suppressing the overdrying state. This configuration has the effect of suppressing the humidifying element 39 from becoming overdried and suppressing the precipitation of scale on the humidifying element 39. In addition, since the scale is less likely to be deposited, it also has the effect of suppressing the generation of offensive odors and germs due to the scale.

Further, as an additional configuration, in the configuration of the ventilation device 200 according to the fourth embodiment described above, a bypass wind formed in the exhaust air passage 51 so that the air flowing through the exhaust air passage 51 flows around the heat exchanger 31. A road 52, a damper 42 provided in the exhaust air passage 51 and movable to a position where the bypass air passage 52 is opened and a position where the bypass air passage 52 is closed are provided, and the control unit 65 determines the position of the damper 42. In the control and overdrying suppression operation, the control unit 65 may be configured to control the damper 42 to move to a position where the bypass air passage 52 is closed. Generally, when the humidifying element 39 is in an overdried state, the exhaust heat exchange air 58 is warmer and moist than the supply air heat exchange air 54. Therefore, the dry / wet ball temperature difference ΔT of the supply air / heat exchange air 54 that has undergone heat exchange becomes smaller than the dry / wet ball temperature difference ΔT of the supply air suction air 53 that has undergone heat exchange, and scale is less likely to be deposited. .. Therefore, due to the additional configuration, the air flowing through the exhaust air passage 51 surely flows through the heat exchanger 31 in the overdrying suppression operation, and the condition is set so that the scale is less likely to deposit on the humidifying element 39. It has the effect that can be achieved.

Further, as an additional configuration, in the configuration of the ventilation device 200 according to the fourth embodiment described above, the control unit 65 maintains the overdrying suppression operation until a predetermined time Ts elapses from the start of the overdrying suppression operation. A configuration that controls the operation may be added. With this configuration, it is possible to prevent the ventilation device 200 from switching between the normal operation and the overdrying suppression operation in a short time, and it is possible to improve the stability of the control.

Further, as an additional configuration, in the configuration of the ventilation device 200 according to the fourth embodiment described above, in the dry state determination unit 66, the water supply means supplies water to the humidifying element 39, and the air supply blower 32 blows the air in the air supply air passage 50. A configuration may be added to determine whether or not the humidifying element 39 is in an overdried state during the humidifying / ventilation operation. With this configuration, it is possible to prevent the humidifying element 39 from becoming overdried and depositing scale during the humidifying / ventilation operation.

Further, as an additional configuration, in the configuration of the ventilation device 200 according to the fourth embodiment described above, in the dry state determination unit 66, the water supply means does not supply water to the humidifying element 39, and the air supply blower 32 is the air in the air supply air passage 50. A configuration may be added to determine whether or not the humidifying element 39 is in an overdried state during the drying operation of blowing air. With this configuration, it is possible to prevent the humidifying element 39 from becoming overdried during the drying operation and precipitating scale.

In the ventilation device 200 according to the fourth embodiment, the control unit 65 controls to move the damper 42 to a position where the bypass air passage 52 is blocked in the overdrying suppression operation, but the present invention is not limited to this. For example, as in the overdrying suppression operation of increasing the water supply flow rate of FIG. 6 shown in the first embodiment, in the overdrying suppression operation, the control unit 65 increases the water supply flow rate of the water supply means as compared with immediately before the overdrying suppression operation. You may control to make it. As an example, in the modified example of the fourth embodiment, the control unit 65 controls the water supply flow rate to be 100% in the overdrying suppression operation.

Further, as in the overdrying suppression operation of FIG. 11 shown in the third embodiment, in the overdrying suppression operation, the control unit 65 controls to reduce the heating amount of the temperature control coil 38 as compared with immediately before the overdrying suppression operation. You may go. As an example, in the modified example of the fourth embodiment, the control unit 65 controls the heating amount to be 0% in the overdrying suppression operation.

Further, the overdrying suppressing operation for increasing the water supply flow rate, the overdrying suppressing operation for reducing the heating amount of the temperature control coil 38, and the overdrying suppressing operation for blocking the bypass air passage 52 may be performed at the same time.

The ventilation device 200 of the fourth embodiment derives the dry / wet ball temperature difference ΔT of the air before supply / humidification from the temperature and humidity of the supply / suction air 53, but the present invention is not limited to this. Similar to the humidifying device 101 of the third embodiment, for example, the temperature sensor and the humidity sensor are arranged on the supply air outlet 46 side of the temperature control coil 38 and on the supply air suction port 45 side of the humidifying element 39. The temperature and humidity of the air 55 before supply / humidification may be directly measured to derive the dry / wet ball temperature difference ΔT. Further, the overdrying determination value fd may be derived by using the dry / wet ball temperature difference ΔT of the supply air suction air 53 without deriving the dry / wet ball temperature difference ΔT of the air before supply / humidification. In this case, in steps S12 and S15 of FIG. 4, it is determined whether or not the value obtained by adding the predetermined margin α to the overdrying determination value fd is larger than the overdrying determination threshold value ε (fd + α> ε). The margin α may be an experimentally obtained constant or a function proportional to the heating amount of the temperature control coil 38. In this case, the exhaust temperature sensor 36 and the exhaust humidity sensor 37 are unnecessary.

Further, in the ventilation device 200 according to the fourth embodiment, the supply air temperature sensor 34, the supply air humidity sensor 35, the exhaust temperature sensor 36, and the exhaust humidity sensor 37 are arranged inside the main body casing 30, but the present invention is limited to this. not. Instead of the supply air temperature sensor 34 and the supply air humidity sensor 35, the temperature and humidity of the air in another space different from the ventilation space may be acquired from the input interface 61. For example, when the outdoor space is different from the ventilation space, the temperature and humidity of the outdoor space may be obtained from a network such as the Internet. In this case, the temperature or humidity acquired from the input interface 61 corresponds to the temperature or humidity of the air passing through the air supply air passage. Further, instead of the exhaust temperature sensor 36 and the exhaust humidity sensor 37, the ventilation space may be acquired from the input interface 61. For example, it is possible to communicate with an air conditioner attached to the ventilation space, and the set temperature and the set humidity of the air conditioner may be acquired via the input interface 61. In this case, the set temperature or set humidity acquired through the input interface corresponds to the temperature or humidity of the air passing through the exhaust air passage.

Further, the ventilation device 200 of the fourth embodiment derives the dry / wet ball temperature difference ΔT of the air before supply / humidification from the temperature and humidity of the supply air suction air 53 and the temperature and humidity of the exhaust suction air 57. Not limited to. For example, the temperature sensor and the humidity sensor are arranged on the supply air outlet 46 side of the temperature control coil 38 and on the supply air suction port 45 side of the humidification element 39, and the temperature and humidity of the air before supply air humidification 55 are directly measured. A configuration may be used in which the temperature difference ΔT of the wet and dry spheres is derived by measurement. In this configuration, the four sensors of the supply air temperature sensor 34, the supply air humidity sensor 35, the exhaust temperature sensor 36, and the exhaust humidity sensor 37 become unnecessary, and the dry / wet ball temperature difference ΔT can be derived by the two sensors.

Further, in the ventilation device 200 according to the fourth embodiment, the storage unit 64 stores the equation of the number 7 as a method of deriving the overdrying determination value fd, and the respective numerical values are substituted into the equation to obtain the overdrying determination value fd. Is calculated, but it is not limited to this. For example, the storage unit 64 stores a table simulating the correlation of the number 7 in each dry / wet ball temperature difference ΔT having the supply air volume Qoa and the supply water flow rate Qw as rows or columns and the overdrying determination value fd as an element. , The acquired air supply air volume Qoa and the supply water flow rate Qw may be referred to in the table to derive the overdrying determination value fd.

Further, the ventilation device 200 according to the fourth embodiment has a temperature control coil 38, a damper 42, and a bypass air passage 52, but is not limited to this, and has a temperature control coil, a ventilation device damper, and a bypass air passage. It doesn't have to be.

Further, in the ventilation device 200 according to the fourth embodiment, the main body casing 1 has a heat exchanger 31, a supply air blower 32, an exhaust blower 33, a supply air temperature sensor 34, a supply air humidity sensor 35, and an exhaust temperature sensor. 36, an exhaust humidity sensor 37, a temperature control coil 38, a humidifying element 39, a water supply pipe 40, a water supply valve 41, a damper 42, and a control device 43 are housed, but the present invention is not limited to this. For example, there are two casings, one of which has a heat exchanger 31, a supply air blower 32, an exhaust blower 33, a supply air temperature sensor 34, a supply air humidity sensor 35, and an exhaust temperature sensor 36. The exhaust humidity sensor 37, the damper 42, and the control device 43 may be housed, and the temperature control coil 38, the humidifying element 39, the water supply pipe 40, and the water supply valve 41 may be housed in the other casing. .. In this case, the two casings correspond to the main body casing.

Embodiment 5.
Next, the ventilation device 200 of the fifth embodiment will be described. The ventilation device 200 of the fifth embodiment is different from the ventilation device 200 of the fourth embodiment in the control of the overdrying suppression operation. The configuration and control of the ventilation device 200 of the fourth embodiment except for the control of the overdrying suppression operation are the same as the configuration and control of the ventilation device 200 of the fourth embodiment, and the description thereof will be omitted.

FIG. 18 is a flowchart of control of the overdrying suppression operation in the ventilation device according to the fifth embodiment. Next, the control of the overdrying suppression operation in the fifth embodiment will be described. The steps S502, S503, and S504 for controlling the overdrying suppression operation in the fifth embodiment are mainly from the timer unit 22 as compared with the steps S102, S103, and S104 for controlling the overdrying suppression operation in the first embodiment. Only the point changed to the timer unit 67 is different, and the control contents are the same, so the explanation is omitted.

In step S501, the control unit 65 reduces the amount of air supply air from immediately before the overdrying suppression operation is performed. Specifically, the control unit 65 transmits a control signal for reducing the air volume of the air supply air blower 32, so that the air volume of the air supply air blower 32 is reduced and the air supply air volume is reduced. In step S501, the control unit 65 may be controlled to be set to the supply air volume selected in advance by the user or the manufacturer, or may be controlled to reduce the supply air volume by a predetermined ratio or step, or may be dried. Control may be performed in which the state determination unit 66 calculates the supply air amount that disappears in the overdry state when the overdry determination value fd is derived, and sets the calculated air volume. As an example, in the fifth embodiment, the control unit 65 controls so that the air volume of the air supply blower 32 becomes weak.

As described above, the ventilation device 200 of the fifth embodiment has the configuration of the ventilation device 200 according to the above-mentioned fourth embodiment as an additional configuration, and in the overdrying suppression operation, the control unit 65 immediately before the overdrying suppression operation is performed. A configuration is added to control the air volume of the air supply blower 32 to be reduced. With this configuration, the amount of air supply air is reduced in the overdrying suppression operation. In general, the temperature exchange efficiency and enthalpy exchange efficiency of the heat exchanger 31 change depending on the ratio of the exhaust air volume to the supply air volume, and when the ratio of the exhaust air volume increases, the temperature exchange efficiency and the enthalpy exchange efficiency of the heat exchanger 31 increase. It increases and the temperature difference ΔT of the dry / wet ball of the air 55 before supply / humidification becomes smaller. Therefore, the additional configuration can make the humidifying element 39 a condition in which scale is less likely to precipitate.

Further, the additional configuration shown in the fifth embodiment may be added to the configuration of the ventilation device 200 according to the fourth embodiment together with the other additional configurations shown in the fourth embodiment. In particular, the overdrying suppression operation for reducing the air volume of the air supply blower 32 shown in the fifth embodiment may be performed at the same time as the other overdrying suppression operation shown in the fourth embodiment.

Embodiment 6.
Next, the ventilation device 200 of the sixth embodiment will be described. The ventilation device 200 of the sixth embodiment is different from the ventilation device 200 of the fourth embodiment in the control of the overdrying suppression operation. The configuration and control of the ventilation device 200 of the fourth embodiment except for the control of the overdrying suppression operation are the same as the configuration and control of the ventilation device 200 of the fourth embodiment, and the description thereof will be omitted.

FIG. 19 is a flowchart of control of the overdrying suppression operation in the ventilation device according to the sixth embodiment. Next, the control of the overdrying suppression operation in the sixth embodiment will be described. Note that the steps S603, S604, and S605 for controlling the overdrying suppression operation in the sixth embodiment are mainly timer units as compared with the steps S102, S103, S12, and S104 for controlling the overdrying suppression operation in the first embodiment. Only the change from 22 to the timer unit 67 is different, and the control contents are the same, so the description is omitted.

In step S601, the control unit 65 opens the second air passage of the heat exchanger 31 and closes the bypass air passage 52. Specifically, the control unit 65 opens the second air passage of the heat exchanger 31 to the damper 42 and transmits the control signal to move the bypass air passage 52 to a position where the bypass air passage 52 is closed, so that the second air passage of the heat exchanger 31 can be closed. The air passage of No. 2 is opened and the bypass air passage 52 is closed.

After the process of step S601 is completed, the process proceeds to step S602. In step S602, the control unit 65 increases the exhaust air volume. Specifically, the control unit 65 increases the exhaust air volume by transmitting a control signal that increases the air volume of the exhaust blower 33. In step S602, the control unit 65 may be controlled to set the exhaust air volume to a preset value selected by the user or the manufacturer, or may be controlled to increase the exhaust air volume by a predetermined ratio or step. As an example, in the sixth embodiment, the control unit 65 controls so that the air volume of the air supply blower 32 becomes stronger.

As described above, the ventilation device 200 of the fifth embodiment has the configuration of the ventilation device 200 according to the above-mentioned fourth embodiment as an additional configuration, and in the overdrying suppression operation, the control unit 65 immediately before the overdrying suppression operation is performed. A configuration is added for controlling to increase the air volume of the exhaust blower 33. With this configuration, the exhaust air volume increases in the overdrying suppression operation, the temperature exchange efficiency and the enthalpy exchange efficiency of the heat exchanger 31 increase, and the dry / wet ball temperature difference ΔT of the air before supply / humidification 55 becomes small. Therefore, the additional configuration can make the humidifying element 39 a condition in which scale is less likely to precipitate.

Further, the additional configuration shown in the sixth embodiment may be added to the configuration of the ventilation device 200 according to the fourth embodiment together with the other additional configurations shown in the fourth embodiment or the fifth embodiment. In particular, the overdrying suppression operation for increasing the air volume of the exhaust blower 33 shown in the sixth embodiment may be performed at the same time as the other overdrying suppression operation shown in the fourth or fifth embodiment.

Further, the ventilation device 200 according to the fourth embodiment has the damper 42 and the bypass air passage 52, but the present invention is not limited to this, and the ventilation device damper and the bypass air passage may not be provided. In this case, since the exhaust suction air 57 always passes through the second air passage of the heat exchanger 31, the process of step S601 becomes unnecessary.

Embodiment 7.
Next, the ventilation device 200 of the seventh embodiment will be described. The ventilation device 200 of the sixth embodiment has a control content of suppressing overdrying of the humidifying element 39 of the ventilation device 200 and a plurality of overdrying suppression operations as compared with the ventilation device 200 of the fourth embodiment. Is different. Other than that, the configuration and control of the ventilation device 200 of the fourth embodiment are the same as the configuration and control of the ventilation device 200 of the fourth embodiment, and the description thereof will be omitted.

FIG. 20 is a flowchart of control for suppressing the overdrying state of the humidifying element of the ventilation device according to the seventh embodiment. The control of the flowchart of FIG. 20 starts when the user performs an operation of starting the operation of the ventilation device 200 from the operation terminal 44.

In step S1001, the dry state determination unit 66 derives the overdrying determination value fd. Since the method for deriving the overdrying determination value fd in step S1001 is the same as step S11 in the flowchart of FIG. 15 of the fourth embodiment, the description thereof will be omitted.

After the processing of step S1001 is completed, the process proceeds to step S1002. In step S1002, the dry state determination unit 66 determines whether or not the overdrying determination value fd derived in step S1001 is larger than the overdrying determination threshold value ε. The overdrying determination threshold value ε is a predetermined constant and is stored in the storage unit 64.

When the dry state determination unit 66 determines in step S1002 that the overdry determination value fd is larger than the overdry determination threshold value ε (step S1002, Yes), the process proceeds to step S1003. In step S1003, the control unit 65 stops the control of the normal operation in the flowchart of FIG.

After the process of step S1003 is completed, the process proceeds to step S1004. In step S1004, the control unit 65 controls the ventilation device 200 to perform the first overdrying suppression operation. The details of the first overdrying suppression operation will be described later.

After the process of step S1004 is completed, the process proceeds to step S1005. In step S1005, the dry state determination unit 66 derives the overdrying determination value fd as in step S1001.

After the process of step S1005 is completed, the process proceeds to step S1006. In step S1006, the dry state determination unit 66 determines whether or not the overdrying determination value fd derived in step S1005 is larger than the overdrying determination threshold value ε.

If the dry state determination unit 66 determines in step S1006 that the overdrying determination value fd is larger than the overdrying determination threshold value ε (step S1006, Yes), the process proceeds to step S1007. In step S1007, the control unit 65 controls the ventilation device 200 to perform the first overdrying suppression operation. The details of the second overdrying suppression operation will be described later.

After the process of step S1007 is completed, the process proceeds to step S1008. In step S1008, the dry state determination unit 66 derives the overdrying determination value fd as in step S1001.

After the process of step S1008 is completed, the process proceeds to step S1009. In step S1009, the dry state determination unit 66 determines whether or not the overdry determination value fd derived in step S1008 is larger than the overdry determination threshold value ε.

When the dry state determination unit 66 determines in step S1009 that the overdrying determination value fd is larger than the overdrying determination threshold value ε (step S1009, Yes), the process proceeds to step S1010. In step S1010, the control unit 65 controls the ventilation device 200 to perform the third overdrying suppression operation. The details of the third overdrying suppression operation will be described later.

After the process of step S1010 is completed, the process proceeds to step S1011. In step S1011, the dry state determination unit 66 derives the overdrying determination value fd as in step S1001.

After the process of step S1011 is completed, the process proceeds to step S1012. In step S1012, the dry state determination unit 66 determines whether or not the overdrying determination value fd derived in step S1011 is larger than the overdrying determination threshold value ε.

When the dry state determination unit 66 determines in step S1012 that the overdrying determination value fd is larger than the overdrying determination threshold value ε (step S1012, Yes), the process proceeds to step S1013. In step S1013, the control unit 65 controls the ventilation device 200 to perform the fourth overdrying suppression operation. The details of the fourth overdrying suppression operation will be described later.

After the process of step S1013 is completed, the process proceeds to step S1014. In step S1014, the dry state determination unit 66 derives the overdrying determination value fd as in step S1001.

After the process of step S1014 is completed, the process proceeds to step S1015. In step S1015, the dry state determination unit 66 determines whether or not the overdry determination value fd derived in step S1014 is larger than the overdry determination threshold value ε.

When the dry state determination unit 66 determines in step S1015 that the overdry determination value fd is larger than the overdry determination threshold value ε (step S1015, Yes), the process proceeds to step S1004, and the first overdry suppression operation is performed again.

When the dry state determination unit 66 determines that the overdrying determination value fd is equal to or less than the overdrying determination threshold value ε in steps S1006, S1009, S1012, and S1015 (steps S1006, S1009, S1012, S1015, No), the process proceeds to step S1016. In step S1016, the control unit 65 controls the ventilation device 200 to restart the normal operation.

After the processing of step S1016 is completed, or when the dry state determination unit 66 determines that the overdry determination value fd is equal to or less than the overdry determination threshold value ε in step S1002 (step S1002, No), the process proceeds to step S1017. In step S1017, the dry state determination unit 66 determines whether the control unit 65 has stopped the operation of the ventilation device 200.

When the dry state determination unit 66 determines in step S1017 that the control unit 65 has stopped the operation of the ventilation device 200 (step S1017, Yes), the control for suppressing the overdry state of the humidifying element 39 is terminated. If the dry state determination unit 66 determines in step S1017 that the operation of the ventilation device 200 has not been stopped (step S1017, No), the process proceeds to step S1001, and the dry state determination unit 66 determines the overdrying determination value fd. Is derived.

FIG. 21 is an example of a table showing the first to fourth overdrying suppression operations of the ventilation device according to the seventh embodiment. Next, the first to fourth overdrying suppression operations will be described.

As shown in FIG. 21, the storage unit 64 stores the contents of the control performed by the control unit 65 in the first to fourth overdrying suppression operations. Further, a plurality of patterns are stored in the storage unit 64 as the control contents of the first to fourth overdrying suppression operations.

The content of the control performed by the control unit 65 in the first to fourth overdry suppression operations in each pattern is the control to increase the water supply flow rate of the water supply means as compared with immediately before the overdry suppression operation as in the first embodiment. The control of reducing the heating amount of the temperature control coil 38 from immediately before the overdrying suppression operation as in the third embodiment, the control of closing the bypass air passage 52 as in the fourth embodiment, and the embodiment. One or more from the control of reducing the air supply air volume from immediately before the overdrying suppression operation as in 5 and the control of increasing the exhaust air volume from immediately before the overdrying suppression operation as in the sixth embodiment. It is set. The content of the control may be set by either the user or the manufacturer. Further, it is not necessary to set all the first to fourth overdrying suppression operations, and it is sufficient that at least the control contents of the first and second overdrying suppression operations are set. When the control content is not set, the control unit 65 maintains the immediately preceding overdrying suppression operation.

In the flowchart of FIG. 20, the control unit 65 performs the first to fourth overdrying suppression operations according to the content of the control stored in one predetermined pattern among the patterns. Further, the pattern may be determined by the user from the operation terminal 44 or by the manufacturer at the time of shipment, and the control unit 65 automatically determines the pattern from the operating state of the ventilation device 200. May be done. For example, when the dry state determination unit 66 determines that the overdry determination value fd is larger than the overdry determination threshold value ε during the humidification / ventilation operation, the control unit 65 is stored in a pattern set in advance by the user or the manufacturer. When the dry state determination unit 66 determines that the overdrying determination value fd is larger than the overdrying determination threshold value ε during the drying operation according to the content of the control, the control unit starts from the first according to the content of the control stored in the pattern 5. The fourth overdrying suppression operation is performed.

For example, in pattern 1, in the first overdrying suppression operation, the control unit 65 controls to move the damper 42 to a position where the bypass air passage 52 is blocked. In the second overdrying suppression operation, the control unit 65 controls so that the water supply flow rate becomes 100%. In the third overdrying suppression operation, the control unit 65 controls so that the heating amount becomes 50%. In the fourth overdrying suppression operation, control is performed so that the air volume of the air supply blower 32 is weak and the air volume of the exhaust blower 33 is strong.

Further, in the pattern 2, in the first overdrying suppression operation, the control unit 65 controls to move the damper 42 to a position where the bypass air passage 52 is blocked. In the second overdrying suppression operation, the control unit 65 controls so that the water supply flow rate becomes 100%. In the third overdrying suppression operation, the control unit 65 controls so that the heating amount becomes 25%. The fourth overdrying suppression operation is not set.

Further, in the pattern 3, in the first overdrying suppression operation, the control unit 65 controls to move the damper 42 to a position where the bypass air passage 52 is blocked. In the second overdrying suppression operation, the control unit 65 controls so that the heating amount becomes 25%. The third and fourth overdrying suppression operations are not set.

Further, in the pattern 4, in the first overdrying suppression operation, the control unit 65 controls to move the damper 42 to a position where the bypass air passage 52 is blocked. In the second overdrying suppression operation, the control unit 65 controls so that the heating amount becomes 50%. In the third overdrying suppression operation, the control unit 65 controls so that the heating amount becomes 25%. The fourth overdrying suppression operation is not set.

Further, in the pattern 5, in the first overdrying suppression operation, the control unit 65 controls so that the air volume of the supply air blower 32 is weak and the air volume of the exhaust blower 33 is strong in the fourth overdrying suppression operation. In the second overdrying suppression operation, the control unit 65 controls so that the heating amount becomes 0%. In the third overdrying suppression operation, the control unit 65 controls so that the water supply flow rate becomes 50%. The fourth overdrying suppression operation is not set.

When the control unit 65 controls different targets in the first to fourth overdrying suppression operations, the overdrying suppression operations overlap. For example, in the fourth overdrying suppression operation of pattern 1, the control unit 65 moves the damper 42 to a position where the damper blocks the bypass air passage 52, the water supply flow rate becomes 100%, and the heating amount becomes 50%. .. Control is performed so that the air volume of the supply air blower 32 is weak and the air volume of the exhaust blower 33 is strong.

Further, when the control unit 65 controls the same target in the first to fourth overdrying suppression operations, the content of the control of the overdrying suppression operation performed later has priority. For example, in the third overdrying suppression operation of pattern 4, the damper 42 is moved to a position where the damper blocks the bypass air passage 52, and control is performed so that the heating amount becomes 25%.

As described above, in the ventilation device 200 of the seventh embodiment, as an additional configuration, in the configuration of the ventilation device 200 according to the above-mentioned fourth embodiment, the overdrying suppression operation is at least the first overdrying suppression operation and the second. The dry state determination unit 66 determines that the overdrying determination value fd is larger than the overdrying determination threshold value ε when the overdrying suppression operation is performed and the first overdrying suppression operation and the second overdrying suppression operation are not performed. Then, the control unit 65 controls to perform the first overdrying suppression operation, and when the overdrying determination value fd is larger than the overdrying determination threshold value ε when the first overdrying suppression operation is performed, the dry state determination unit 66 However, the control unit 65 has added a configuration for controlling so as to perform the second overdrying suppression operation. With this configuration, even if the overdrying state of the humidifying element 39 continues even after the first overdrying suppressing operation is performed, the overdrying state of the humidifying element 39 is suppressed by performing the second overdrying suppressing operation. However, it has the effect of suppressing the precipitation of scale components on the humidifying element 39.

Further, in the ventilation device 200 of the seventh embodiment, as an additional configuration, when the control unit 65 controls different targets in the first overdrying suppression operation and the second overdrying suppression operation, the first overdrying is performed. The suppression operation and the second overdry suppression operation each have an overlapping configuration. This configuration further suppresses the overdrying state of the humidifying element 39, and has the effect of suppressing the precipitation of scale components on the humidifying element 39.

Further, in the ventilation device 200 of the seventh embodiment, as an additional configuration, when the control unit 65 controls the same target in the first overdrying suppression operation and the second overdrying suppression operation, the first overdrying is performed. A configuration is added in which the second overdrying suppression operation is prioritized over the suppression operation. This configuration further suppresses the overdrying state of the humidifying element 39, and has the effect of suppressing the precipitation of scale components on the humidifying element 39.

Further, in the seventh embodiment, the storage unit 64 stores five patterns for the first to fourth overdrying suppression operations, but the present invention is not limited to this. As for the overdrying suppressing operation, the storage unit 64 need only store at least the first overdrying suppressing operation and the second overdrying suppressing operation. Further, as for the pattern, the storage unit 64 may store one or a plurality of patterns of two or more.

Further, although the seventh embodiment is the embodiment related to the ventilation device 200, the additional configuration of the seventh embodiment may be added to the humidifying device 100 shown in the first embodiment.

1 Main body casing, 2 Blower, 3 Temperature sensor, 4 Humidity sensor, 5 Humidification element, 6 Water supply pipe, 7 Water supply valve, 8 Control device, 9 Operation terminal, 10 Suction port, 11 Air outlet, 12 Water supply pipe connection port, 13 Air passage, 14 suction air, 15 post-humidified air, 16 input interface, 17 output interface, 18 microcomputer, 19 storage unit, 20 control unit, 21 dry state judgment unit, 22 timer unit, 23 temperature control coil, 24 pre-humidification air , 30 body casing, 31 heat exchanger, 32 air supply blower, 33 exhaust blower, 34 air supply temperature sensor, 35 air supply humidity sensor, 36 exhaust temperature sensor, 37 exhaust humidity sensor, 38 temperature control coil, 39 humidification element, 40 water supply pipe, 41 water supply valve, 42 damper, 43 control device, 44 operation terminal, 45 air supply inlet, 46 air supply outlet, 47 exhaust suction port, 48 exhaust outlet, 49 water supply pipe connection port, 50 air supply air Road, 51 Exhaust air passage, 52 Bypass air passage, 53 Supply air suction air, 54 Supply air heat exchange air, 55 Supply air before humidification air, 56 Supply air after humidification air, 57 Exhaust suction air, 58 Exhaust heat exchange air, 59 Exhaust blown air, 60 Exhaust bypass passing air, 61 Input interface, 62 Output interface, 63 Microcomputer, 64 Storage unit, 65 Control unit, 66 Dry state judgment unit, 67 Timer unit, 100 Humidifying device, 101 Humidifying device, 200 Ventilation Device

Claims (9)

A supply air suction port, a supply air outlet, an exhaust suction port, and an exhaust air outlet are formed, and an air supply air passage, an exhaust suction port, and an exhaust air in which the air supply suction port and the air supply air outlet communicate with each other are formed. The main body casing in which the exhaust air passage that communicates with the air outlet is formed, and
An air supply blower provided in the air supply air passage to blow air from the air supply inlet to the air supply outlet.
An exhaust blower provided in the exhaust air passage to blow air from the exhaust suction port to the exhaust outlet.
A heat exchanger provided in the air supply air passage and the exhaust air passage to exchange heat between the air flowing through the air supply air passage and the air flowing through the exhaust air passage.
A humidifying element provided on the air supply outlet side of the heat exchanger in the air supply air passage to humidify the passing air, and a humidifying element.
A water supply means for supplying water to the humidifying element and
A control unit that controls the water supply flow rate of the water supply means and the air volume of the air supply blower ,
An input interface that receives information about the temperature of the air passing through the air supply air passage and information about the humidity of the air passing through the air supply air passage.
Whether or not the humidifying element is in an overdried state in which scale is deposited on the humidifying element based on the temperature, the humidity, the air volume of the air supply blower, and the water supply flow rate of the water supply means acquired via the input interface. Dry condition judgment unit to judge
A bypass air passage formed in the exhaust air passage and formed so that the air flowing through the exhaust air passage bypasses the heat exchanger.
A damper provided in the exhaust air passage and movable to a position where the bypass air passage is opened and a position where the bypass air passage is closed ,
Equipped with
When the drying state determination unit determines that the humidifying element is in the overdrying state, the control unit suppresses the overdrying state of the humidifying element and suppresses the precipitation of scale on the humidifying element. Control to drive ,
The control unit controls the position of the damper, and in the overdrying suppression operation, the control unit controls the damper to move to a position where the bypass air passage is blocked . A supply air suction port, a supply air outlet, an exhaust suction port, and an exhaust air outlet are formed, and an air supply air passage, an exhaust suction port, and an exhaust air in which the air supply suction port and the air supply air outlet communicate with each other are formed. The main body casing in which the exhaust air passage that communicates with the air outlet is formed, and
An air supply blower provided in the air supply air passage to blow air from the air supply inlet to the air supply outlet.
An exhaust blower provided in the exhaust air passage to blow air from the exhaust suction port to the exhaust outlet.
A heat exchanger provided in the air supply air passage and the exhaust air passage to exchange heat between the air flowing through the air supply air passage and the air flowing through the exhaust air passage.
A humidifying element provided on the air supply outlet side of the heat exchanger in the air supply air passage to humidify the passing air, and a humidifying element.
A water supply means for supplying water to the humidifying element and
A control unit that controls the water supply flow rate of the water supply means and the air volume of the air supply blower,
An input interface that receives information about the temperature of the air passing through the air supply air passage and information about the humidity of the air passing through the air supply air passage.
Whether or not the humidifying element is in an overdried state in which scale is deposited on the humidifying element based on the temperature, the humidity, the air volume of the air supply blower, and the water supply flow rate of the water supply means acquired via the input interface. Dry condition judgment unit to judge
Equipped with
When the drying state determination unit determines that the humidifying element is in the overdrying state, the control unit suppresses the overdrying state of the humidifying element and suppresses the precipitation of scale on the humidifying element. Control to drive,
In the overdrying suppression operation, the control unit controls to increase the air volume of the exhaust blower from immediately before the overdrying suppression operation . A supply air suction port, a supply air outlet, an exhaust suction port, and an exhaust air outlet are formed, and an air supply air passage, an exhaust suction port, and an exhaust air in which the air supply suction port and the air supply air outlet communicate with each other are formed. The main body casing in which the exhaust air passage that communicates with the air outlet is formed, and
An air supply blower provided in the air supply air passage to blow air from the air supply inlet to the air supply outlet.
An exhaust blower provided in the exhaust air passage to blow air from the exhaust suction port to the exhaust outlet.
A heat exchanger provided in the air supply air passage and the exhaust air passage to exchange heat between the air flowing through the air supply air passage and the air flowing through the exhaust air passage.
A humidifying element provided on the air supply outlet side of the heat exchanger in the air supply air passage to humidify the passing air, and a humidifying element.
A water supply means for supplying water to the humidifying element and
A control unit that controls the water supply flow rate of the water supply means and the air volume of the air supply blower,
An input interface that receives information about the temperature of the air passing through the air supply air passage and information about the humidity of the air passing through the air supply air passage.
An air supply temperature sensor and an air supply humidity sensor that are arranged inside the air supply air passage on the air supply inlet side of the heat exchanger and are communicably connected to the input interface.
An exhaust temperature sensor and an exhaust humidity sensor arranged inside the exhaust air passage on the exhaust suction port side of the heat exchanger and communicatively connected to the input interface.
The temperature acquired by the air supply temperature sensor, the humidity acquired by the air supply humidity sensor, the temperature acquired by the exhaust temperature sensor, the temperature acquired by the exhaust humidity sensor, the air volume of the air supply blower, and the water supply of the water supply means. A dry state determination unit that determines whether or not the humidifying element is in an overdried state in which scale is deposited on the humidifying element based on the flow rate.
Equipped with
When the drying state determination unit determines that the humidifying element is in the overdrying state, the control unit suppresses the overdrying state of the humidifying element and suppresses the precipitation of scale on the humidifying element. A ventilation device that controls the operation . An air supply temperature sensor and an air supply humidity sensor that are arranged inside the air supply air passage on the air supply inlet side of the heat exchanger and are communicably connected to the input interface.
The exhaust temperature sensor and the exhaust humidity sensor, which are arranged inside the exhaust air passage on the exhaust suction port side of the heat exchanger and are communicably connected to the input interface, are provided.
The dry state determining unit includes the temperature acquired by the supply air temperature sensor, the humidity acquired by the supply air humidity sensor, the temperature acquired by the exhaust temperature sensor, the temperature acquired by the exhaust humidity sensor, and the air volume of the air supply blower. The ventilation device according to claim 1 or 2, wherein it is determined whether or not the humidifying element is in the overdried state based on the water supply flow rate of the water supply means. An air supply temperature sensor and an air supply humidity sensor that are arranged inside the air supply air passage on the air supply inlet side of the heat exchanger and are communicably connected to the input interface.
The exhaust temperature sensor and the exhaust humidity sensor, which are arranged inside the exhaust air passage on the exhaust suction port side of the heat exchanger and are communicably connected to the input interface, are provided.
The dry state determining unit includes the temperature acquired by the supply air temperature sensor, the humidity acquired by the supply air humidity sensor, the temperature acquired by the exhaust temperature sensor, the temperature acquired by the exhaust humidity sensor, and the air volume of the air supply blower. And based on the water supply flow rate of the water supply means, it is determined whether or not the humidifying element is in the overdried state.
The ventilation device according to claim 1, wherein in the overdrying suppression operation, the control unit controls to increase the air volume of the exhaust blower from immediately before the overdrying suppression operation . The ventilation device according to any one of claims 1 to 5, wherein in the overdrying suppression operation, the control unit controls to reduce the air volume of the air supply blower from immediately before the overdrying suppression operation . The ventilation device according to any one of claims 1 to 6 , wherein in the overdrying suppression operation, the control unit controls to increase the water supply flow rate of the water supply means from immediately before the overdrying suppression operation. A temperature control coil is provided inside the air supply air passage on the air supply outlet side of the heat exchanger to heat the air blown to the humidifying element.
The control unit controls the heating amount of the temperature control coil .
The ventilation device according to any one of claims 1 to 7, wherein in the overdrying suppression operation, the control unit reduces the heating amount of the temperature control coil as compared with immediately before the overdrying suppression operation. An air supply temperature sensor that is located inside the air supply air passage on the air supply outlet side of the temperature control coil and on the air supply inlet side of the humidification element and is communicably connected to the input interface. And equipped with air supply humidity sensor,
In the dry state determination unit, the humidifying element is in the overdried state based on the temperature acquired by the air supply temperature sensor, the humidity acquired by the air supply humidity sensor, the air volume of the air supply blower, and the water supply flow rate of the water supply means. The ventilation device according to claim 8, wherein it is determined whether or not there is a ventilation device.

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