JPH0646106B2 - Self-driving fan - Google Patents

Description

TECHNICAL FIELD The present invention relates to an automatic operation ventilation fan that automatically ventilates a specific ventilation main part, that is, a specific room such as a toilet.

[Prior Art] This type of ventilating fan is disclosed in, for example, Japanese Patent Application Laid-Open No. 57-14759.
It has a configuration as disclosed in Japanese Patent Publication No. That is, as shown in FIG. 10, the detection signal of the infrared sensor 101 for detecting a person is input to the amplifier circuit 102, and the output of the amplifier circuit 102 is input to the low pass filter 103. In the AC amplified detection signal, unnecessary signal components such as instantaneous extraneous components are included in the low pass filter 1.
It is removed by 03 and transmitted to the AD conversion circuit 104. The AD conversion circuit 104 converts the alternating-current detection signal that has passed through the low-pass filter 103 into direct current and outputs it to the switching drive circuit 105, and the switching drive circuit 105.
Is operated, and the current circuit of the fan motor 106 connected to the AC power supply is opened and closed by the switching circuit 107. That is, the infrared sensor 101 provided on the ventilation fan
The presence / absence of a person is detected by, and the ventilation operation is automatically started by detecting the presence of the person, and the ventilation operation is automatically stopped by the absence of the presence of the person. Therefore, in a toilet or the like, a ventilation operation can be automatically performed when a person enters the room, and the ventilation operation can be automatically stopped when the person leaves the room, so that the toilet has an atmosphere that does not cause discomfort.

[Problems to be Solved by the Invention] In the conventional automatic operation ventilation fan, the ventilation operation with the same air volume is performed while a person is present and for a while after leaving the room, which is not annoying to the person in the room. Since it is necessary to obtain a driving sound, it is a win due to insufficient ventilation and insufficient ventilation. Even if ventilation is performed after leaving the room, it takes a considerable amount of time to remove odors in the toilet, or the ventilation operation ends with incomplete removal of odors. Although quick ventilation is realized by increasing the air volume, if the air volume is increased, it is not possible to obtain a driving sound that does not disturb the people in the room, and the problem regarding noise is exposed.

In addition, the detection area of the infrared sensor is not so large, and even if there are people in a large space, the ventilation is stopped, so it can be applied only to a narrow place like a toilet in a private house,
This includes a problem to be solved such that the ventilation operation is executed even in a situation where the room temperature is considerably low and ventilation is performed to give a strong feeling of cold air.

The present invention has been made to solve such a conventional problem, and it is possible to perform a ventilation operation with an air volume according to the situation, and to cope with the size and temperature conditions of a place. The purpose is to obtain a driving fan.

[Means for Solving the Problem] An automatic operation ventilation fan according to the present invention has a strong notch / weak notch blower switching means, a fan motor driven by a drive circuit, and a differential type based on infrared rays emitted by a person. Infrared sensor for detecting a person who outputs a signal, a signal detection circuit for detecting the output of the infrared sensor, a person detection signal reading means for reading a person detection force from the output of the signal detection circuit and forming a manned or unmanned output signal A weak notch operation timer set by a manned output signal of the human detection signal reading means, a strong notch operation timer which is reset during operation of the weak notch operation timer and is set when the operation of the weak notch operation timer ends, Load drive means for operating the drive circuit to operate the fan motor while the weak notch operation timer and the strong notch operation timer are operating. It is stopped when there is no human detection signal based on the infrared sensor and there is no weak notch operation timer operation, and when the human detection signal based on the infrared sensor is output, the weak notch operation timer operation always causes a weak notch operation. After the ventilation operation is performed and the output of the human detection signal is stopped and the weak notch operation timer is operated, the control section performs the remaining operation by the strong notch ventilation operation by the strong notch timer for a limited period of time.

In another automatic operation ventilation fan according to the present invention, the timer times of the weak notch operation timer and the strong notch operation timer are made variable by the timer time setting means.

Furthermore, in another automatic operation ventilation fan according to the present invention, a temperature sensor for detecting the room temperature of the ventilation main part is provided in the operation control system by an infrared sensor for human detection together with the signal reading means of the temperature sensor.

[Operation] In the automatic operation ventilation fan of the present invention, the fan motor is stopped when there is no human detection signal based on the infrared sensor and the operation of the weak notch operation timer, and when the human detection signal based on the infrared sensor is output, The weak notch operation timer operates to perform low noise and low air volume weak notch ventilation operation at all times, and the human detection signal is no longer output. The residual operation by the notch ventilation operation will be performed.

In addition, in another automatic operation ventilation fan of the present invention, it is possible to adjust the recognition time from unattended detection to unattended detection or the remaining operation time according to the narrowness of the application area.

Further, in another automatic operation ventilation fan of the present invention, when there is a human detection signal, the ventilation operation is not stopped or performed in a situation where the detected value of the temperature sensor is equal to or lower than a predetermined temperature and the room temperature is significantly lowered by ventilation. You can

[Embodiment] All of FIGS. 1 to 9 show an embodiment of the present invention, and FIG. 1 shows an embodiment of a control circuit of an automatic operation ventilation fan. That is, 1 is the commercial power supply 2 and its fan motor 3
Is the main body of the connected ventilation fan. The fan motor 3 has a strong notch tap and a weak notch tap, and is configured to be able to switch between low and high air flow levels of high and low operation. The control system that controls the fan motor 3 includes a DC power supply circuit 4 that forms a DC power supply for the control system from the commercial power supply 2, and an infrared sensor 5 for detecting a person that outputs a differential signal based on infrared rays emitted by a person. A temperature sensor 6 for detecting the temperature of the ventilation fan mounting space, a microcomputer (hereinafter referred to as a microcomputer) 7, a changeover switch 8, and bidirectional thyristors 9 and 10 for changing the air volume. . The infrared sensor 5 is connected to a signal detection circuit 11 that amplifies an output that appears as a voltage fluctuation and inputs it to the microcomputer 7. Reference numerals 12 and 13 are resistors inserted in the gate sides of the bidirectional thyristors 9 and 10, respectively, and 14 is a resistor inserted in series with the temperature sensor 6. Microcomputer 7
Shows the program divided into functional blocks.
As shown in the figure, a temperature sensor signal reading means 15 for reading a voltage change based on a resistance value change accompanying a temperature change of the temperature sensor 6, and a human detection signal for reading a voltage change of the infrared sensor 5 amplified by the signal detection circuit 11. Reading means 1
6 and 6 are provided on the input side. The output of the former is input to the load driving means 17 that operates the drive circuit of the fan motor 3, and the output of the latter is input to the weak notch operation timer 18. The weak notch operation timer 18 is set by the manned output signal of the human detection signal reading means 16 and counts when there is an unmanned output signal. Weak notch operation timer 18
A strong notch operation timer 19 is connected to this, and this strong notch operation timer 19 is reset when the weak notch operation timer 18 counts and is set when the weak notch operation timer 18 finishes counting. The load driving means 17 operates the drive circuit to operate the fan motor 3 while the weak notch operation timer 18 and the strong notch operation timer 19 are operating.
Timer times of the weak notch operation timer 18 and the strong notch operation timer 19 are set by the timer time setting means 20.

As shown in FIG. 3, the signal detection circuit 11 connecting the infrared sensor 5 and the human detection signal reading means 16 of the microcomputer 7 has a bandpass characteristic of about 0.1 to 10 Hz which matches the operating speed of a person. Is connected to the operational amplifier or the comparator 22, and the output voltage of the high gain voltage amplifier 21 is on the non-inverting input side of the comparator 22 and the reference voltage 23 is on the inverting input side. Is applied.

FIG. 4 is a diagram showing the transition of the operating state of this automatic operation ventilation fan, and FIG. 5 is a timing chart showing the operation pattern. First, the outline of the operation will be described. Whether the ventilation fan main body 1 is stopped (a in FIG. 4), is performing a low notch weak notch operation (b in FIG. 4), or is a high notch strong notch operation (see FIG. 4). You are either in the state of c) in the figure. The stopped state B is when there is no person using the room, such as a toilet, to which the ventilation fan main body 1 is attached. When there is a person in the room and the air volume is low, the notch operation is low, and when the person leaves the room, there is no person in the room. . If there is a person entering the room again in the high notch strong notch operation C, this operating state is changed to the weak notch operation B, and if there is no person entering the room, it is shifted to the stop state a. In other words, when there is a person in the room, a low notch operation with a low air volume is always performed with a low sound that is almost unnoticeable to occupants. Operation C will be performed as a residual operation. Since the residual operation is performed after leaving the room, there is no problem even if the noise is a little high, and it is sufficient if a quick ventilation can be realized. The above-mentioned operation is performed in detail as follows. When the human detection signal reading unit 16 does not read the human detection signal for a sufficiently long time (it can be said that there is an unattended detection signal), the weak notch operation timer 18 and the strong notch operation timer 19 are used to load the load driving unit 17. The drive command is not output and the fan motor 3 is stopped. Human detection signal reading means 16
However, when the human detection signal from the operation amplifier of the signal detection circuit 11 or the comparator 22 is read, the weak notch operation timer 18 is set. Weak notch operation timer 1
8 starts counting immediately after setting, simultaneously outputs a command for the weak notch operation to the load driving means 17, and resets the strong notch operation timer 19. Human detection signal reading means 16
When the human detection signal is continuously read by, the weak notch operation timer 18 is also continuously set, the command of the weak notch operation is continuously output to the load driving means 17, and the load driving means 17
Is connected to the weak notch drive circuit of the fan motor 3, and the fan motor 3 performs weak notch operation. Next, when there is no output from the human detection signal reading means 16 (when there is no person present due to leaving the room), the weak notch operation timer 18 keeps counting, and ends counting as the set timer time elapses. The strong notch operation timer 19 is set. The strong notch operation timer 19 outputs a command for the strong notch operation to the load driving means 17, and the load driving means 17
Is connected to the drive circuit for the strong notch of the fan motor 3, and the fan motor 3 performs the strong notch operation, that is, the remaining operation. If the output from the human detection signal reading means 16 is not completed before the strong notch operation timer 19 counts, this remaining operation continues until the timer time set by the strong notch operation timer 19 has elapsed. If there is an output from the human detection signal reading means 16 while the strong notch operation timer 19 is counting, the strong notch operation timer 19 is immediately reset, and the weak notch operation timer 18 shifts to the weak notch operation.

When the temperature sensor 6 detects a low temperature environment below the set room temperature, this output is read by the temperature sensor reading unit 15, and the temperature sensor reading unit 15 outputs a stop command to the load driving unit 17 to load the load. The drive means 17 stops the fan motor 3. In this case, even if there is a human detection signal, the fan motor 3 is stopped and the ventilation operation is not performed. Therefore, if ventilation is carried out, the ventilation will be voluntarily stopped in a situation where the temperature environment of the room is significantly deteriorated.

The above operation is as shown in the timing chart of FIG. Although t ₁ to t ₂ and t _{2 to} t _{3 in} the figure are timer times of the weak notch operation timer 18 and the strong notch operation timer 19, respectively, these are variable elements that can be adjusted by the timer time setting means 20. FIG. 6 shows a case where an automatic operation ventilation fan is attached to a small toilet L1 in a private house, and FIG. 7 shows a case where a plurality of automatic operation ventilation fans are attached to a large public toilet L2. In the case of FIG. 6, the toilet L
If there is a person in 1, the person will always enter the person detection area of the infrared sensor 5, so that it is easy to confirm whether or not there is a person. In the case of FIG. 7, since there is no person in the human detection area of each ventilation fan main body 1 at all times, the presence of the person is confirmed when the person crosses the human detection area. That is, in the application of the toilet L1, if there is a person, the person always enters the detection area of the infrared sensor 5, so that the person detection signal can be continuously read. Therefore, taking into consideration that the infrared sensor 5 outputs the differential type based on the motion of the person, it is possible to set the weak notch operation timer 18 for a time longer than the time at which the person may temporarily stop the motion. Good. On the other hand, in the case of application to the public toilet L2, since the installation space is large and a person does not always enter the detection area of the infrared sensor 5, it is impossible to continuously read the person detection signal. is there. Therefore, the weak notch operation timer 18 takes a sufficient time to set the time for confirming that the person is not completely present. Further, the timer time of the strong notch operation timer 19 is also lengthened by shortening the timer time of the weak notch operation timer 18 in the former, and shortened by increasing the timer time of the weak notch operation timer 18 in the latter. As a result, in any of the application examples, it is possible to perform the ventilation operation close to the proper ventilation. In this example, when the contact of the changeover switch 8 is changed, the changeover information is input to the microcomputer 7. In the timer time setting means 20 of the functional block in the microcomputer 7, for the toilet L1 fixed beforehand by software and for the public toilet L2.
The timer times of the strong notch timer 19 and the weak notch timer 18 are set.

FIG. 8 shows voltage waveforms at points a and b in FIG. 3. Point b, that is, the output of the comparator 22 becomes a digital signal, and this digital signal is input to the human detection signal reading means 16 of the microcomputer 7. It Further, FIG. 9 is an enlarged view of the digital signal of FIG. 8, and there are a signal d having a narrow pulse width and a signal e having a wide pulse width. However, the microcomputer 7 continuously performs three times with a predetermined time width. The signal state is confirmed by the user, and if all three confirmations are at the H level, it is recognized as a human detection signal, and if any one of the three confirmations is at the L level, it is regarded as a human detection signal. Instead, it is recognized as an erroneous signal due to external noise.

[Effects of the Invention] As described above, according to the automatic operation ventilation fan of the present invention, when there is no human detection signal based on the infrared sensor and the weak notch operation timer does not operate, the fan motor is stopped and the human detection signal based on the infrared sensor is output. When it is being output, the weak notch operation timer operates to perform low noise and low air volume weak notch ventilation operation, and the human detection signal is not output. As a result, the residual operation is performed by the high notch strong notch ventilation operation, and it becomes possible to perform the appropriate ventilation operation with the air volume according to the situation.

That is, even if the ventilation operation is performed due to the non-detection of the detection sensor, a detection sensor of a type that responds quickly to the movement of the person when the person moves outside the detection area of the detection sensor and is still in the room Only by using, it is assumed that strong ventilation operates to cause a noise problem regardless of whether the person is still in the toilet, but according to the present invention, the weak notch operation timer can be set even if the person is no longer sensed. Since strong ventilation operation is not performed while it is assumed that there are people, it is possible to achieve the intended purpose without exposing the problem of noise.

Further, according to another automatic operation ventilation fan of the present invention, the recognition time of unattended detection or the remaining operation time can be changed from the detection of manned people, so that the installation place is wide, for example, a public toilet or the like. Even in a place, if a person does not always stay within the detection area of the infrared sensor, it is possible to take a sufficient time for the weak notch operation timer to confirm that the person is completely absent and then perform a strong notch operation. .

Further, according to another automatic operation ventilation fan of the present invention, when there is a human detection signal, the ventilation operation is stopped or activated when the detected value of the temperature sensor is equal to or lower than a predetermined temperature and the room temperature is significantly lowered by ventilation. It is possible to prevent the deterioration of the temperature environment due to ventilation and to voluntarily avoid the deterioration of the temperature environment.

In other words, any of the automatic operation ventilation fans can perform ventilation operation with an air volume according to the situation, and there is an effect that a room such as a toilet can be made to have a more comfortable atmosphere.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of a control circuit for an automatic operation ventilation fan according to the present invention, FIG. 2 is a functional block diagram showing the configuration of the microcomputer shown in FIG. 1, and FIG. 3 is an embodiment of a signal detection circuit of the same. 4 is an explanatory diagram showing the transition of the operation of the automatic operation ventilation fan, FIG. 5 is a timing chart showing the operation pattern of the automatic operation ventilation fan, and FIG. 6 and FIG. FIG. 8 is an explanatory diagram showing the difference in human detection method depending on the size, FIG. 8 is an explanatory diagram showing the output waveform of each point in FIG. 3, FIG. 9 is an explanatory diagram showing the signal recognition method of the microcomputer, and FIG. 10 is a conventional example. 2 is a circuit diagram showing a control circuit of the automatic operation ventilation fan as shown in FIG. In the figure, 1 is a ventilation fan main body, 2 is a commercial power supply, 3 is a fan motor, 5 is an infrared sensor, 6 is a temperature sensor, 7 is a microcomputer, 9 and 10 are bidirectional thyristors, 15 is a temperature sensor signal reading means, 16 Is a human detection signal reading means, 17 is a load driving means, 18 is a weak notch operation timer, 19 is a strong notch operation timer, 20 is a timer time setting means, 21 is a high gain voltage amplifier, and 22 is a comparator. The same reference numerals in the drawings indicate the same or corresponding parts.

Claims (3)

[Claims] 1. A fan motor having a strong notch / weak notch blower switching means and driven by a drive circuit, an infrared sensor for detecting a person that outputs a differential type signal based on infrared rays emitted by a person, and this infrared ray. A signal detection circuit that detects the output of the sensor, a human detection signal reading unit that reads the human detection output from the output of this signal detection circuit, and forms a manned or unmanned output signal, depending on the human output signal of this human detection signal reading unit The weak notch operation timer that is set, is reset while this weak notch operation timer is operating, and is set when the operation of the weak notch operation timer ends. A load drive means for operating the drive circuit to drive a fan motor, without a human detection signal based on the infrared sensor. It is stopped when the notch operation timer is not operating, and when the human detection signal based on the infrared sensor is output, the weak notch operation timer operation always performs weak notch ventilation operation and the human detection signal is not output. An automatic operation ventilation fan comprising a control unit for performing a residual operation by a strong notch ventilation operation by a strong notch timer in a timed manner after the operation of the weak notch operation timer. 2. The automatic operation ventilation fan according to claim 1, wherein the timer times of the weak notch operation timer and the strong notch operation timer are variable by the timer time setting means. 3. A temperature sensor for detecting the room temperature of a ventilation main part,
A ventilation reading operation is not stopped or performed when the detection value of the temperature sensor is below a predetermined temperature, provided only when there is a human detection signal, provided together with the signal reading means of the temperature sensor. The automatic operation ventilation fan according to claim 1 or claim 2.