JP3507156B2 - Air flow control device for ventilation fan - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air volume control device for a ventilation fan for maintaining a set air volume in a ventilation fan for discharging air from a plurality of rooms to the outside. 2. Description of the Related Art Conventionally, a ventilation fan for discharging air from a plurality of rooms to the outside by operating a fan motor has been provided. However, the load of the ventilation fan depends on installation conditions (such as ventilation length such as duct length and duct diameter). Resistance, the air density of the room, etc.), it is not possible to obtain the set airflow simply by controlling the rotation speed of the fan motor to be constant. In order to detect the load of the ventilation fan, an airflow sensor is provided in the exhaust path of the ventilation fan, and the airflow control of the ventilation fan adjusts the rotation of the fan motor so that the airflow detected by the airflow sensor becomes the set airflow. Equipment is provided. Therefore, regardless of the load of the ventilation fan, the exhaust air volume of the ventilation fan is adjusted to the set air volume, so that the intake air volume from each room can be maintained at the set air volume. [0004] However, in the above-mentioned conventional example, the amount of suction from each room is set at the time of installation of the ventilation fan. The suction volume from the room may fluctuate. For this reason, in the case of a ventilation fan for two rooms, while the set amount of air is large for the suction amount from one room, the amount of suction from the other room is smaller than the set amount of air, resulting in insufficient ventilation. There is a disadvantage that. The present invention has been made in view of the above circumstances, and has as its object to maintain the air intake volume from each room at a set air volume even when the load of the ventilation fan corresponding to the air intake port fluctuates. It is an object of the present invention to provide an air flow control device for a ventilating fan. The air flow control device for a ventilation fan according to the present invention has a main suction port and a sub suction port in addition to one exhaust port, and the main suction port is operated in accordance with the operation of a fan motor. A ventilation fan that sucks air in a predetermined room directly from the mouth and sucks air in a different room from the sub-suction port through a duct and discharges it to the outside through the exhaust port is provided, and the exhaust air volume of the ventilation fan is adjusted to the set air volume. Provided a constant air volume control means,
Closing means for adjusting an opening area of the sub-suction port is provided, before
A rotation speed detecting means for detecting the rotation speed of the fan motor is provided.
The auxiliary suction port is fully opened and fully closed by the opening / closing means.
When the constant air volume control means is operated in each state
The number of rotations of the fan motor detected by the rotation number detection means.
A load amount detecting means for detecting a load amount of the ventilation fan corresponding to the main suction port and the sub suction port based on the number of turns is provided, and a load amount of the ventilation fan corresponding to each suction port detected by the load amount detection means is provided. Control means for adjusting the opening area of the sub-suction port by the opening / closing means on the basis of (1). In the case of the air flow control device for a ventilation fan according to claim 1,
During operation of the ventilation fan, it depends on the operation of the fan motor.
Air from a given room directly through the main
The air in the different rooms is sucked through the duct through the suction port and discharged to the outside through the exhaust port. Thereby, air in a plurality of rooms can be simultaneously ventilated. Here, since the constant air volume control means adjusts the exhaust air volume of the ventilation fan to the set air volume, the exhaust air volume of the ventilation fan is the set air volume regardless of the load of the ventilation fan, and each of the suction ports is adjusted. The suction volume from the air also becomes the set air volume. By the way, for example, when a duct is piped, since the load of the ventilation fan corresponding to each suction port varies, the suction amount from each suction port may fluctuate from the set air volume. Therefore, the load amount detecting means is operated by the opening / closing means.
In each state with the suction port fully open and fully closed,
Fan detected by rotation speed detection means when activated
Ventilation fans corresponding to each suction port based on the number of rotations of the motor
Detect the load. Then, the control means, load detecting means for adjusting the opening area of the auxiliary suction inlet by loading based Dzu <br/> have opening and closing means ventilators corresponding to each suction port has been detected. As a result, regardless of the variation in the load of the ventilation fan corresponding to each suction port, the suction volume from each suction port is maintained at the set air volume.
While using the constant air volume operation by the constant air volume control means,
To reliably detect the load of the ventilation fan corresponding to the suction port
Therefore, the overall configuration can be simplified. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention is applied to a two-room ventilation fan.
Embodiments will be described with reference to the drawings . FIG. 2 shows a cross section of a bathroom and a toilet as a room. In FIG. 2, a ventilation fan 2 for a two-room duct is installed behind the ceiling of a bathroom 1.
It is attached. On the underside of the ventilation fan body 3 of this ventilation fan 2
Is provided with a main suction port 4, and the main suction port 4 is provided in a bathroom.
1 and directly on the side of the ventilation fan body 3
A sub-suction port 5 is provided, and the sub-suction port 5 is a duct.
It communicates with the toilet 7 through 6. In addition, the ventilation fan body
3 is provided with one exhaust port 8 on its side.
The vent 8 communicates with the outside through a duct 9. FIG . 3 shows the main body 3 of the ventilation fan. This figure
In 3, the auxiliary suction port 5 of the ventilation fan main body 3 is provided with opening / closing means.
The damper 10 is provided, and the damper 10
The opening area of the sub suction port 5 is adjusted more.
You. FIG. 1 shows a ventilation fan 2 and an air volume control device of the ventilation fan 2 in functional blocks. In FIG. 1, the ventilation fan 2 includes a DC fan motor 15, and the rotation of the DC fan motor 15 draws air from the bathroom 1 and the bathroom 7 and discharges the air to the outside. The constant current control means 16 operates the DC fan motor 15 at a constant current. The current detecting means 17 has a DC
When the fan motor 15 is stopped, the current consumption of the constant current control means 16 is detected. In this case, the constant current control means 16
The DC fan motor 15 is operated with the output current corrected based on the current value detected by the current detecting means 17. The rotation number detecting means 18 detects the number of rotations of the DC fan motor 15 and gives the detection result to a motor output varying means 19 as a constant air volume control means. The storage means 20 stores the number of rotations when the DC fan motor 15 is stabilized immediately after starting to detect the load amount of the ventilation fan 2 and the set rotation number at which the exhaust air volume of the ventilation fan 2 becomes the set air volume under the conditions. Is stored in advance. In this case, the control unit 21 stores the storage unit 20 in order to operate the ventilation fan 2 with the air volume indicated by the air volume instruction unit 22.
Is compared with the current operating speed detected by the speed detecting means, and the set speed of the DC fan motor 15 is adjusted so that the operating speed becomes the set speed. Further, the control means 21 is provided through the damper adjusting means 23.
To adjust the opening of the damper 10. FIG. 4 shows the functional block diagram shown in FIG. 1 by an electric circuit. In FIG. 4, the DC fan motor 15 has a motor control IC 25 built therein. The motor control IC 25 includes a switching circuit 27 composed of a transistor for turning on and off a current flowing through the motor winding part 26 and a position detection circuit 28 composed of a Hall element for detecting a rotational position of a rotor (not shown) of the DC fan motor 15. The DC fan motor 15 is operated by turning on / off the switching circuit 27 based on the detection state of the position detection circuit 28. In this case, the ground of the motor winding part 26 and the ground of the motor control IC 25 are shared, and a current detecting resistor 29 is connected to the ground. Therefore, the current consumed by the DC fan motor 15 and the motor control IC 25 passes through the current detection resistor 29, so that the entire current consumption can be detected by detecting the voltage generated by the current detection resistor 29. On the other hand, the switching power supply 30 is
The converter converts AC from DC into DC and outputs the same. The DC fan motor 15 is supplied with a predetermined voltage Vm and the motor control IC 25 is supplied with a predetermined voltage Vcc. The microcomputer 32 instructs the switching power supply 30 to apply a voltage to the DC fan motor 15, and the switching power supply 30 applies a predetermined voltage Vm to the DC fan motor 15 in accordance with the command. The microcomputer 32 detects the entire current consumption by detecting the voltage of the current detecting resistor 29 through the switching power supply 30. Now, depending on the installation condition of the ventilation fan 2, the ventilation fan 2
Therefore, even when the DC fan motor 15 is rotated at the set number of revolutions, the exhaust air volume of the ventilation fan 2 varies. That is, as the length of the ducts 6 and 9 connected to the ventilation fan body 3 becomes longer, or as the inner diameters of the ducts 6 and 9 become smaller, the load on the ventilation fan 2 increases and the exhaust air volume of the ventilation fan 2 decreases. . Further, as the airtightness of the bathroom 1 or the washroom 7 to which the ventilation fan 2 is attached is higher, the load of the ventilation fan 2 is increased and the exhaust air volume of the ventilation fan 2 is reduced. Therefore, the microcomputer 32 maintains the exhaust air volume at the set air volume regardless of the load of the ventilation fan 2 as follows. That is, FIG. 5 shows a constant air volume operation of the microcomputer 32.
In FIG. 5, when the power is turned on, the microcomputer 32 controls the switching power supply 25 to output a constant current to the DC fan motor 15, thereby starting the DC fan motor 15 with a constant current (step S1). . Thereby, the air in the bathroom 1 and the toilet 7 is discharged outside through the ducts 6 and 9 with the operation of the DC fan motor 15. Subsequently, the microcomputer 32 sets D
The rotational speed of the C fan motor 15 is detected (step S
2) Retrieval of an installation condition as a load of the ventilation fan 2 based on the operation speed (step S3). in this case,
As shown in FIG. 6, the microcomputer 32 stores in advance the relationship between the current supplied to the DC fan motor 15 and the rotation speed of the DC fan motor 15 in correspondence with the load amounts L1, L2,. Indicates a case where the load of the ventilation fan 2 is large, and L4 indicates a case where the load of the ventilation fan 2 is small. Therefore, the load (installation condition) of the ventilation fan 2 can be determined by detecting the operating speed of the DC fan motor 15 when the DC fan motor 15 is operated at the constant current IM. Then, the microcomputer 32 obtains a set rotation speed of the DC fan motor 15 corresponding to the set airflow based on the load of the ventilation fan 2 determined as described above. That is, as shown in FIG.
Since the relationship between the set rotation speed of 5 and the exhaust air volume at that time corresponds to the load amount, the microcomputer 32 determines the set air volume by taking in the air volume instruction signal (step S4), and determines the set air volume and the ventilation fan. A set rotation speed of the DC fan motor 15 required to obtain the set airflow is obtained from the relationship with the load amount (Step S5). In this case, the microcomputer 32 stores, as a data table, the set rotation speed of the DC fan motor 15 and the amount of exhaust air of the ventilation fan 2 at that time in accordance with the load amount of the ventilation fan 2 as shown in FIG. The set rotation speed of the DC fan motor 15 corresponding to the set air volume is obtained based on the data table. The microcomputer 32 has D
The rotational speed of the C fan motor 15 is detected (step S
6) The operation speed is compared with the set speed (step S7). When the operation speed is higher than the set speed, it is necessary to reduce the exhaust air volume of the ventilation fan 2, so the output of the switching power supply 30 is output. A voltage down signal is output to lower the voltage (step S8). When the operation speed is lower than the set speed, it is necessary to increase the air volume of the ventilation fan, so that a voltage increase signal is output to increase the output voltage of the switching power supply 30 (step S9). With the above control, the DC fan motor 15
Is controlled so that the operating rotation speed of the ventilation fan 2 becomes the set rotation speed, so that the exhaust air volume of the ventilation fan 2 is adjusted to the set air volume. Subsequently, the microcomputer 32
DC when the operating frequency of the fan motor 15 was set rotation number is judged whether it has reached the verify operation point time (step S10), and the above-described control until the confirmation operation point time Iteratively, when the operating point confirmation time has been reached, the process returns to step S1 and the load of the ventilation fan 2 is determined again with the DC fan motor 15 started at a constant current. Next, the operation of adjusting the opening of the damper of the microcomputer 32 will be described. In this case, the microcomputer 32 performs the opening adjustment operation of the damper 10 when the power is turned on, prior to the constant air volume operation described above. [0026] That is, FIG. 9 is the micro-computer 32
The angle adjustment operation of the damper 10 according to FIG. This figure 9
When the power is turned on, the microcomputer 32 fully opens the damper 10 (step T1).
In the open state, the constant air volume operation shown in FIG.
2). Thereby, both the main suction port 4 and the sub suction port 5
Since the suction is activated, the air in the bathroom 1 and the toilet 7 is
The constant air volume can be ventilated. At this time, the main suction port 4
And necessary to make the air volume through the sub suction port 5 constant
The rotation speed of the DC fan motor 15 is
The load of the ventilation fan 2 corresponding to both the auxiliary suction port 5
Therefore, the microcomputer 32 is
The number of rotations of the DC fan motor 15 is determined by the motor output control information.
The information is stored as information (step T3). Subsequently, the microcomputer 32
The damper 10 is fully closed (step T4), and it is determined in the fully closed state.
The air volume operation is executed (Step T5). This allows the primary
Since only suction through the suction port 4 is activated, the bathroom
1 can be discharged at a constant air volume. At this time,
It is necessary to make the air volume through the main suction port 4 constant.
The rotation speed of the DC fan motor 15
9 corresponds to the amount of load that reaches the outside through
The microcomputer 32 operates such a motor.
The number of revolutions is stored as motor output control information (step
T6). Subsequently, the microcomputer 32
Of the damper 10 based on the motor output control information
After setting the opening, adjust the opening of the damper 10 (step
T7, T8). Then, the microcomputer 32
As described above, so that the suction amount of the sub suction port 5 is appropriate.
After adjusting the opening of the damper 10, the constant air volume shown in FIG.
Execute the operation . By the above operation, even if the piping work of the duct 6 connecting the ventilation fan 2 and the washroom 7 is performed after the installation of the ventilation fan 2, the suction amount of the main suction port 4 and the sub suction port 5 varies. Since this can be prevented, the air in the washroom 7 and the bathroom 1 can be ventilated at a constant volume through the suction ports 4 and 5. According to the above configuration, a two-room ventilation fan
2 , the load of the ventilation fan 2 corresponding to the main suction port 4 and the sub suction port 5 is detected, and based on the load,
By adjusting the opening of the damper 10 provided in the sub-suction port 5 to adjust the suction amount of each of the suction ports 4 and 5 to the set air amount, the exhaust air amount of the ventilation fan becomes the set air amount. Thus, unlike the conventional example in which only a constant air volume control is performed, the ventilation fan 2 through the main suction port 4 and the sub suction port 5 is different.
Even if the load amount changes, it is possible to prevent the ventilation air volume of the toilet 7 and the bathroom 1 from changing regardless of the change. The load of the ventilation fan 2 is determined based on the rotation speed when the DC fan motor 15 is started at a constant current, and the operation speed of the DC fan motor 15 corresponding to the set airflow is determined based on the load. Since the constant air volume operation is executed by obtaining the air volume, the exhaust air volume of the ventilation fan 2 can be adjusted to the set air volume without providing a special sensor such as an air volume sensor. Therefore, as compared with a configuration in which an airflow sensor is provided to prevent the influence of the load of the ventilation fan, the overall cost can be reduced and the number of installation steps can be simplified. In this case, in this embodiment, the load of the ventilation fan 2 corresponding to the main suction port 4 and the sub suction port 5 is obtained by using such a constant air volume operation, so that the entire configuration is simplified. it is Ru can be. The present invention is not limited to the above embodiment, but can be modified or expanded as follows. You may make it apply to the ventilation fan of the type which ventilates the air of three or more rooms simultaneously. An AC motor may be used as the fan motor of the ventilation fan. As is clear from the above description, the air flow control device for a ventilation fan according to the present invention has the following effects. According to the first aspect of the present invention, air in a predetermined room is directly sucked from the main suction port in accordance with the operation of the fan motor, and air from a different room is sucked through the duct from the sub suction port to the outside from one exhaust port. When adjusting the opening area of the sub-suction port based on the load of the ventilation fan corresponding to each suction port in the ventilator to be discharged , fully open and fully open the sub-suction port.
When the constant air volume operation is performed in each closed state, the fan motor
Based on the rotation speed, the load of the ventilation fan corresponding to each
Since the airflow is detected , regardless of the variation in the load of the ventilation fan corresponding to each air inlet, the constant air volume operation is used while maintaining the air volume from each air inlet at the set air volume .
Thus, the overall configuration can be simplified. [0036]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall functional block diagram showing one embodiment of the present invention. FIG. 2 is a longitudinal sectional view of a bathroom and a toilet. FIG. 3 is a perspective view of a ventilation fan main body. FIG. FIG. 5 is a flow chart showing a constant air volume operation of the microcomputer. FIG. 6 is a characteristic diagram showing a correspondence relationship between the number of rotations of the fan motor and an energizing current. FIG. FIG. 8 is a characteristic diagram showing the correspondence between the set rotation speed of the fan and the air flow rate of the ventilation fan. FIG. 8 is a table showing the load amount of the ventilation fan and the set rotation speed of the fan motor corresponding to the set air flow rate of the ventilation fan. table [eXPLANATION oF sYMBOLS] 1 showing the correspondence between the degree of opening of the applied voltage and the damper for flow [10] damper showing the opening adjustment operation bathroom (room), 2 ventilation duct two rooms , 4
Main suction port, 5: Sub suction port , 7: Toilet (room), 15: DC fan motor, 6, 9 : Duct, 10 : Damper (opening / closing means), 19: Motor output variable means (Constant air volume control means) , 21 is a control hand stage.

Claims (1)

(57) [Claims 1] A main suction port and a sub suction port are provided in addition to one exhaust port, and air in a predetermined room is supplied from the main suction port according to operation of a fan motor. A ventilating fan for directly sucking and sucking air from different rooms through the duct from the sub-suction port and discharging the air to the outside through the exhaust port; constant air volume control means for adjusting the exhaust air volume of the ventilating fan to a set air volume; Opening / closing means for adjusting the opening area of the suction port, and rotational speed detecting means for detecting the rotational speed of the fan motor
And the auxiliary suction port was fully opened and fully closed by the opening / closing means.
When the constant air volume control means is operated in each state,
The number of revolutions of the fan motor detected by the number of revolutions detecting means
A load detecting means for detecting a load of ventilators corresponding to the main suction port and the sub suction port on the basis of, based on the load amount of ventilation fan corresponding to each suction port detected by the load detecting means Control means for adjusting the opening area of the sub-suction port by the opening / closing means.