JPH02223747A - Operation controller for ventilating fan - Google Patents

Abstract

PURPOSE:To stop a ventilating operation and enhance safety, in the case where a person approaches a ventilating fan, by providing a human access detecting means in the main body of the ventilating fan, and by providing a controlling circuit for cutting off an electric current flowing to a motor regardless of an output from a human detecting means when a signal is produced by the human access detecting means. CONSTITUTION:In the case where a person approaches a ventilating fan to clean its main body, an output S from a human detecting element 9 varies greatly in a positive direction and, after exceeding the upper-side reference value of a first comparing circuit 11, the output S becomes greater than the upper-side reference value of a second comparing circuit 13. A controlling circuit 14 applies an electric current to a motor 5 on the basis of a human detection signal Sh produced from the first comparing circuit 11 at a point of time when the output S has exceeded the upper-side reference value. However, at a point of time when the output S has exceeded a reference value that is one step higher than the upper-side reference value, a human access detection signal Ss produced from the second comparing circuit 13 of a human access detecting means 12 is sent to the controlling circuit 14 so that the electric current flowing to the motor 5 is cut off for a person has approached the ventilating fan, the ventilating operation can forcibly be stopped even if an automatic operation has been carried out temporarily by a human detecting means 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an operation control device for a ventilation fan that detects the presence or absence of a person and controls ventilation operation.

(Prior art) Conventionally, for example, in a ventilation fan for a toilet, the ventilation fan itself has a
A person detection means for detecting the presence or absence of a person is provided, and ventilation operation is controlled based on the output of this person detection means. That is, when the presence of a person is detected by the person detection means, in other words, when it is detected that a person has entered the toilet, the motor is energized to rotate one blade,
When the person detection means detects the absence of a person, in other words, the exit of a person from the toilet, the ventilation operation is stopped after a certain delay. There is.

(Problem to be Solved by the Invention) However, in the above-mentioned method, when automatic driving is performed based on the output of the human detection means, it is difficult to detect whether a human is present or not!・Ventilation operation is automatically performed when using the ventilation fan, which is convenient, but on the other hand, ventilation operation is performed even when a person approaches the ventilation fan body for cleaning etc., so there is a risk of injury. be. To prevent this, it is troublesome to have to turn off the power in advance, and in this case, there is also the trouble of having to turn on the power again after cleaning the ventilation fan.

The present invention has been made in view of the above circumstances, and its purpose is not only to automatically control ventilation operation depending on the presence or absence of a person, but also to automatically control ventilation operation when a person approaches the ventilation fan body. To provide an operation control device for a ventilation fan which can be forcibly stopped to improve safety.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a ventilation fan body including blades and a motor for rotationally driving the blades, and a person detection means for detecting the presence or absence of a person. , the motor is controlled to be turned on and off based on the output from the person detection means, and includes a person approach detection means for outputting a person approach detection signal when a person approaches the ventilation fan body; A sixth feature resides in that a control circuit is provided to cut off power to the motor regardless of the output of the human detection means when the human approach detection signal is output.

(Function) Since the motor is controlled to turn on and off based on the output from the person detection means, dynamic operation is performed depending on the presence or absence of a person.

Further, when a person approaches the ventilation fan main body, this is detected by the person approach detection means, and the motor is cut off by the control circuit regardless of the output of the person detection means. Therefore, when the ventilation fan gets close to the ventilation fan body for cleaning or the like, the ventilation operation is forcibly stopped, thereby improving safety.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

First, in Figure 3, 1 is, for example!・This is the main body of the ventilation fan installed on the wall of the room.It has a decorative frame 4 with a bell mouth 3 on the front of the main body frame 2 (liii), and a motor (as shown in Fig. 1) inside the main body frame 2. 5), and further includes a blade 6 which is rotationally driven by the motor 5.

Reference numeral 7 denotes a see-through window for a human detection element provided at the lower front of the decorative frame 3.

Next, in FIG. 1, 8 is a person detection means, which is
A person detection element 9 disposed on the back side of the large detection transparent window 7, and an amplifier circuit 10 for amplifying the output of this person detection element 9.
and a first comparison circuit 11. The human detection element 9 is composed of a pyroelectric infrared detection element whose output changes according to changes in the movement of the person, and its output (the output S amplified by the amplifier circuit 10 is shown in FIG. 2(a) As shown in , when no person is detected and there is not much change in the person's movement, the steady level L
However, when there is a change in the movement of a person, the level L changes from the above level L to a positive direction or a negative direction. The above change in the positive direction is seen when a person enters the toilet, and the change in the negative direction is seen when a person leaves the toilet. Further, the first comparison circuit 11 has a lower reference value La for detecting the presence of a person and a lower reference value Lb for detecting the absence of a person using a Schmitt trigger function, The above output S is the upper reference value L
When the output S falls below the lower reference (direct Lb), the output of the human detection signal sh is stopped.

On the other hand, reference numeral 12 denotes human approach detection means, which shares the human detection element 9 and the amplifier circuit 10 with the human detection means 11, and also includes a second comparison circuit 13. When a person approaches the human detection element 9, the human detection element 9 detects the
As shown, the output S changes greatly in the positive direction, and changes slightly in the negative direction as you move away from the object.

Based on this characteristic, the second comparison circuit 7813 uses an upper base (9 values Lc) for detecting the approach of a person to the ventilation fan body 1 and a lower base for detecting the retreat of a person from the ventilation fan body 1. It has a peak value Ld by a Schmitt trigger function, outputs a human approach detection signal Ss when the output S exceeds the lower reference value Lc, and outputs a human approach detection signal Ss when the output S falls below the lower reference value Ld. The output of the person approach detection signal Ss is stopped.

Reference numeral 14 denotes a control circuit composed of, for example, a microcomputer, which energizes the motor 5 via the drive circuit 15 when the human detection signal Sh is inputted manually, and when the human detection signal Sh is no longer input. , for a certain period of time T (Fig. 2(a)
)), the motor 5 is cut off. Also,
When the human approach detection signal Ss is input, the motor 5 is kept in a power-off state for a certain period of time t (see FIG. 2(b)) regardless of whether the human detection signal sh is input.

Now, the operation of the above configuration will be described.

Now, when a person enters the toilet, as shown in Figure 2 (a),
This is because the output S from the human detection element 9 through the amplifier circuit 10 changes in the positive direction and exceeds the upper reference value La of the first comparison circuit 11 (but does not exceed the upper reference value Lc of the second comparison circuit 13). , a human detection signal Sh is outputted from the first comparison circuit 11 of the human detection means 8 and given to the control circuit 14 . Based on the input of the human detection signal S11, the control circuit 14 energizes the motor 5 to start ventilation operation as shown in FIG. 2(a). When the person leaves, the output S changes in the negative direction and falls below the lower reference value Lb of the first comparison circuit 11, so that the output of the person detection signal Sh is stopped. As a result, the control circuit ] 4 is maintained for a certain period of time T
After the motor 5 is energized, the power is cut off. That is, the ventilation operation is stopped after performing T-delay operation for a certain period of time. In this way, automatic driving based on human detection is performed.

Next, when a person approaches the ventilation fan body 1 to clean the ventilation fan body 1, the output S greatly eclipses in the positive direction as shown in FIG. 1 side reference value Lc of comparison circuit 13 of rear cylinder 2 exceeding reference value La
exceed. Therefore, the control circuit 14 outputs the human detection signal sh when the output S exceeds the upper reference value La.
The motor 5 is energized based on this, but when the output S exceeds another upper reference value Lc, a person approach detection signal SS is outputted from the second comparison circuit 13 of the person approach detection means 12 and sent to the control circuit 14. Based on the input of this human approach detection signal Ss, the motor 5 is energized for a certain period of time. As a result, in a situation where a person approaches, the person detection means 8
Even if automatic operation is performed temporarily, it will be forcibly stopped. Therefore, there is no risk of injury, and there is no need to perform troublesome operations such as turning off the power in advance and then turning it on again.

In addition, when cleaning the ventilation fan body 1 after using the toilet, when a person enters the toilet, the motor 5 is turned on based on the person detection signal sh from the person detection means 8, as shown in FIG. 2(c). After that, when the person leaves, the person detection signal S f
Based on the stoppage of the output of i, the motor 5 is energized for a certain period of time T, but if a person enters the toilet and approaches the ventilation fan body 1 to clean it during this period of l, I, T. Since the human approach detection means 12 outputs the human approach detection signal Ss, the motor 5 is forcibly cut off for a certain period of time, and in this case as well, there is no risk of injury, etc., as described above, and if the power is turned off in advance and then There is no need for troublesome operations such as loading.

In the above embodiment, the motor 5 is cut off for a certain period of time from the time when the human approach detection signal Ss is output. It is also possible to

Furthermore, in the above embodiment, the human detection element 9 and the amplifier circuit 10 are commonly used as the human approach detection means 12;
A human detection element and an amplifier circuit may be provided exclusively for the human approach detection means 12.

In addition, the present invention is not limited to the above embodiments, and can be implemented with various modifications within the scope of the gist.

[Effects of the Invention] As is clear from the above description, the present invention provides a ventilation fan body equipped with blades and a motor for rotationally driving the blades, and a person detection means for detecting the presence or absence of a person. The ventilation fan body is configured to control the power on/off of the motor based on the output from the person detection means, and is provided with a person approach detection means for outputting a person approach detection signal when a person approaches the ventilation fan body. The present invention is also characterized by providing a control circuit that cuts off power to the motor regardless of the output of the human detection means when the human approach detection signal is output. Not only can the ventilation operation be automatically controlled depending on the situation, but also the ventilation operation can be forcibly stopped if a person approaches the ventilation fan itself, which can improve safety when cleaning the ventilation fan itself. At the same time, it has the excellent effect of eliminating the trouble of turning the power off and on every time.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a diagram showing a 7U motor on/off mode, and FIG. 3 is a perspective view of a ventilation fan. In the figure, 1 is the ventilation fan body, 5 is the motor, 6 is the blade, 8 is the person detection means, 9 is the person detection element, 11 is the first comparison circuit, 1
2 is a human approach detection means, 13 is a second comparison circuit, and 14 is a control circuit. Applicant: Toshiba Corporation

Claims (1)

[Claims] 1. A person detection means for detecting the presence or absence of a person is provided in the ventilation fan body, which is equipped with blades and a motor for rotationally driving the same, and the motor is turned on and off based on the output from the person detection means. The ventilation fan body is configured to include a person approach detection means for outputting a person approach detection signal when a person approaches the ventilation fan main body, and a person detection means for outputting a person approach detection signal when the person approaches the ventilation fan body. 1. An operation control device for a ventilation fan, comprising a control circuit that cuts off power to the motor regardless of the output of the motor.