JPH01163538A - Ventilation fan - Google Patents

Abstract

PURPOSE:To provide a sufficient ventilation in correspondence with the number of persons by a method wherein the number of inputs of a person sensing signal from a person sensor of which output frequency is increased or decreased in response to the number of persons is counted with a predetermined time and an amount of aeration air is changed over with a detected frequency. CONSTITUTION:A human sensor 6 may output a pulse-like human sensing signal Ss when a person moves. In a sensing frequency sensor circuit 10, a timer circuit 12 may give a clock pulse to a counting circuit 11 every time a predetermined time T passes. The counting circuit 11 may count the sensing signal Ss at a specified time T. When the counted value is higher than a certain reference value for every specified time T, a frequency high signal Sh is outputted, and if the counted value is less than the reference value, a sensed frequency low signal Sl is outputted and further when the counted value is 0, no sensing signal Se is outputted. This output signal is given to an amount of air changing-over circuit 13, controls an output from a ventilation motor 3 through a driving circuit 14 and changes an amount of ventilation air automatically and properly with the number of persons.

Description

[Detailed description of the invention] [Object of the invention] (Industrial application field) The present invention relates to a ventilation fan equipped with a human sensor.

(Prior Art) Conventionally, in this type of ventilation fan, the presence or absence of a person is detected by a human sensor, and if the presence is detected, the ventilation motor is operated, and if the presence is detected, the operation is stopped. in this case,
In ventilation fans whose ventilation motor output is fixed, the ventilation air volume is constant, and even in ventilation fans whose ventilation motor output can be set by the user, the setting does not change during operation. is fixed at a specific air volume. Therefore, in either case, the ventilation air volume remains unchanged during operation.

(Problems to be Solved by the Invention) By the way, when there are many people in a room to be ventilated, the amount of dust and cigarette smoke generated increases, and the air becomes highly polluted. Conversely, when there are fewer people, the air is less polluted. However, in the above method, when the presence of a person is detected, the ventilation motor is simply controlled to operate at a constant output, so for example, when there are many people in a room to be ventilated, If the ventilation air volume is low, there will be insufficient ventilation, and conversely, if there are few people, the ventilation air volume will be higher than necessary, resulting in excessive operation, wasting power consumption, or reducing the room temperature during heating. This causes problems such as a loss of meaning.

Accordingly, an object of the present invention is to provide a ventilation fan that can automatically and appropriately change the ventilation air pressure depending on the number of people, thereby eliminating excess or deficiency of ventilation.

[Configuration of the Invention (Means for Solving Problems) As is well known, a human sensor detects the presence of a person when the person moves. Therefore, when there are many people, the frequency of movement of people is high and the number of times the presence of people is detected increases. In other words, the number of people in a room to be ventilated can be detected to a certain extent based on the detection frequency of the human sensor.

The present invention has been made with attention to this point.

Accordingly, the present invention includes a ventilation motor, a human sensor, and a detection frequency detection means for manually inputting a human detection signal from the human sensor and counting the number of inputs in a set fixed period of time to detect the detection frequency. , and air flow switching means for controlling the output of the ventilation motor to switch the ventilation air volume based on the detection frequency by the detection frequency detection means.

(Function) As can be seen from the double series, the frequency with which the human sensor outputs human detection signals increases or decreases depending on the number of people.

The detection frequency detecting means detects the detection frequency by counting the number of times the human detection signal from the human sensor is manually transmitted in a predetermined period of time. The air volume switching means controls the output of the ventilation motor and switches the ventilation air volume based on this detection frequency.

Therefore, the ventilation operation can be performed with a ventilation flow rate that corresponds to the number of people in the room to be ventilated.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

First, in FIG. 2, 1 is a main body frame of a ventilation fan installed in a room to be ventilated, and 2 is a decorative frame attached to the front of the main body frame 1. A ventilation motor 3 (see FIG. 1) and a fan consisting of blades are provided within the main body frame 1. or,
A cover 4 made of a transparent stone is attached to the front lower part of the decorative frame 2, and a person detection element 5 is provided on the back side of the cover 4. The detection range of this person detection element 5 is set toward a room that should be ventilated, and this person detection element 5 is configured to output an electric signal when the temperature of the surface that absorbs infrared rays changes. The presence of a person is detected by using the change in surface temperature when the person moves.

Next, in FIG. 1, reference numeral 6 denotes a human sensor, which includes the human detection element 5, an amplifier circuit 7, a reference value generation circuit 8, and a comparison circuit 9. In this human sensor 6, the output of the human detection element 5 is amplified by an amplifier circuit 7 and applied to a comparison circuit 9. This comparison circuit 9 is
The amplified signal given from the amplifier circuit 7 and the base signal given from the reference value generation circuit 8 are compared, and the human detection signal Ss is output based on the comparison result. When the robot moves, it outputs a pulse-like human detection signal Ss. Reference numeral 10 denotes a detection frequency detection circuit serving as a detection frequency detection means, and this includes a count circuit 11 and a timer circuit 12. In this detection frequency detection circuit 10, the timer circuit 12 provides a clock pulse to the count circuit 11 at every set fixed time T (for example, about several minutes), and the count circuit 11 receives a signal from the human sensor 6. The given detection signal Ss is given for a certain period of time T.
The count circuit calculates the count value at every fixed time T.
It detects whether the detection frequency is high or low, and when the count value is higher than a certain reference value, it outputs a frequency "high" detection signal sh, and when the count value is lower than the reference value, the detection frequency is It outputs a "low" detection signal S, (.Furthermore, when the count value is "0", it outputs a detection "no" signal Se.The output signal from the detection frequency detection circuit 10 is the air volume switching means. The air volume switching circuit 13 receives the "high" frequency detection signal sh, the "low" frequency detection signal Si, or the "no detection" signal Se given from the detection frequency detection circuit 10.
Accordingly, the output of the ventilation motor 3 is controlled via the drive circuit 14. That is, when the air volume switching circuit 13 is given the "high" frequency detection signal sh from the detection frequency detection circuit 10, it rotates the ventilation motor 3 at a relatively high speed, and when it is given the "low" frequency detection signal Se. The ventilation motor 3 is driven to rotate at a relatively low speed, and when a detection "no" signal Se is given, the ventilation motor 3 is stopped.

The operation of the configuration described in Section 2 will be described with reference to FIG. 3 as well. This third
The figure shows a count circuit 11 in the detection frequency detection circuit 1o.
The functions are shown in a flowchart. When the human sensor 6 outputs the human detection signal Ss, the detection frequency detection circuit 1o
The signal Ss is inputted to the count circuit 11 of. The count circuit 11 calculates the number of manual inputs using a clock pulse (signal "Pl" in FIG.
) is given, it outputs a high frequency detection signal sh, a low frequency detection signal Se, or a no detection signal Se based on the previous count value. Clears and starts counting anew until the next clock pulse is given.

Here, the next clock pulse (symbol "P" in FIG. 4(a)
2) is given, that is, when a certain period of time T has elapsed (this time period is shown as time period T1 in FIG. 4(b)), the count value of the human detection signal Ss in time period T is given. As shown in FIG. 4(b), when there is a relatively large number of clock pulses P2, a detection frequency "high" detection signal sh is instantaneously applied to the air volume switching circuit 13 after the clock pulse P2 is manually applied. Then,
The ventilation motor 3 is rotated at high speed by this air volume switching circuit 13, and as a result, the ventilation air volume is set to "large" as shown by air volume level A in FIG. 4(C).

Thereafter, the count circuit 11 receives a human detection signal Ss from the human sensor 6 based on the human power of the clock pulse 22.
is counted until the next clock pulse P3 (see FIG. 4(a)) is applied.

When the time period from this clock pulse P2 to the next clock pulse P3 is T2, the count value in this time period T2 (see FIG. 4(b)) is relatively When the detection frequency is low, the detection frequency detection circuit 1
0 outputs the frequency "low" detection signal SC and the air volume switching circuit 1
Give to 3. Then, the air volume switching circuit 13 rotates the ventilation motor 3 at a low speed based on the signal SC, thereby instantly changing the air volume after the manual power of the clock pulse P3, as shown by the air volume level B in FIG. 4(c). Set it to "small".

Further, after this, when the count value of the human detection signal Ss during the above-mentioned fixed time T becomes "0", the detection frequency detection circuit 10 outputs a detection "no" signal Se and gives it to the air volume switching circuit 13. In this case, the wind Q switching circuit 13 stops driving the ventilation motor 3.

By the way, when there are many people in a room to be ventilated, it is expected that there will be many people moving around.In other words, the higher the output frequency of the person detection signal Ss of the person sensor 6, the more people will be present in the room. It is judged that.

According to this embodiment, the human detection signal S of the human sensor 6
A detection frequency detection circuit 10 that detects the detection frequency by counting the number of inputs of s is provided, and an air volume switching circuit 13 that controls the output of the ventilation motor 3 and switches the ventilation air volume based on the detection frequency. If there are many people,
Ventilation operation with a large air volume can be automatically executed, and when the number of people is small, ventilation operation with a small air volume can be automatically executed. As a result, the ventilation operation can be performed at a ventilation air volume corresponding to the number of people in the room to be ventilated, without causing insufficient ventilation or over-operation.

In the above embodiment, the ventilation air volume is switched in two ways, "large" and "small J," but the number of switches may be further increased, and in this case, it is possible to control the air flow m more finely. becomes.

The pond water invention is not limited to the above embodiments, but can be implemented with various changes without departing from the gist.

[Effects of the Invention] As is clear from the above description, the present invention has a ventilation motor, a human sensor, and a human detection signal from the human sensor that inputs the human detection signal and inputs the number of inputs at a predetermined period of time. The device is equipped with a detection frequency detection means for detecting the detection frequency using a counting circuit, and an air volume switching means for controlling the output of the ventilation motor and switching the ventilation air based on the detection frequency by the detection frequency detection means. With this, it is possible to automatically and appropriately change the ventilation air volume depending on the amount of air in the room to be ventilated, and it is possible to eliminate excess or deficiency of ventilation, ensuring good ventilation operation at all times. It has excellent effects such as being able to carry out the following.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a block diagram showing the electrical configuration, FIG. 2 is an overall perspective view, FIG. 3 is a flowchart showing the functional content of the counting circuit, and FIG.
) and (b) are signal waveform diagrams of each part, and FIG. 4(c) is a diagram showing changes in ventilation air volume. In the figure, 3 is a ventilation motor, 5 is a person detection element, 6 is a person sensor, 10 is a detection frequency detection circuit (detection frequency detection means), 13
is an air volume switching circuit (air volume switching means). Applicant: Toshiba Corporation

Claims (1)

[Claims] 1. A ventilation motor, a human sensor, and a detection frequency detection means for inputting a human detection signal from the human sensor and counting the number of inputs in a set fixed period of time to detect the detection frequency;
A ventilation fan comprising air volume switching means for controlling the output of the ventilation motor and switching the ventilation air volume based on the detection frequency by the detection frequency detection means.