JP2618134B2 - Ventilation fan automatic operation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation fan automatic operation device for automatically operating a ventilation fan in response to cigarette smoke or the like.

[0002]

2. Description of the Related Art Conventionally, this type of ventilation fan automatic operation device has
Generally, the configuration was as shown in FIGS.

[0003] As shown in FIG.
00, a smoke sensor 104 for detecting smoke or the like of indoor tobacco is provided near the suction port 102 of the ventilation fan main body 103 having a discharge port 101 on one side surface and a suction port 102 on the lower surface. . And the smoke sensor 104
Is provided with a smoke detecting element 105 for converting smoke density into a resistance value, and a heater 106 for heating the smoke detecting element 105. Then, the smoke detection element 105
Is heated by the heater 106 so that the smoke detection element 10
The resistance value of 5 is changed so as to be sensitive to even a small amount of smoke. The detection signal of the smoke sensor 104 is output to the smoke detection circuit 107. The smoke detection circuit 107 converts the voltage into a voltage level corresponding to the smoke density and outputs the converted signal to the smoke density determination means 108. Smoke density determination means 108
In the above, the conversion signal of the smoke detection circuit 107 is compared with a predetermined reference value, and a judgment signal is output to the driving means 109.
In the driving means 109, the operation of the ventilation fan 111 through the driving circuit 110,
Perform a stop.

The smoke density determining means 108 and the driving means 1
09 was realized by the microcomputer 112.

[0005] The operation of the ventilation fan automatic operation device having the above configuration will be described with reference to FIG. First, step 51
, The smoke density data is input from the smoke detection circuit 107 to the microcomputer 112 based on the signal from the smoke sensor 104. Next, in step 52, it is determined whether or not the ventilation fan 111 is operated. If the operation is stopped, the process proceeds to step 53, in which the smoke density is determined to be equal to or higher than the reference value previously input to the microcomputer 112 in step 53. If so, the process proceeds to step 54, and the driving means 109 drives the ventilation circuit 111 through the drive circuit 110.
Driving a, a timer is started to operate T ₀ h proceeds to step 55.

When it is determined in step 52 that the ventilation fan 111 is operating, the process proceeds to step 56,
In step 56 until after T ₀ hour forcibly operate the exhaust fan 111. After the lapse of time T _0, the signal from the smoke sensor 104 is input again in step 57, and then the smoke concentration is determined in step 58. If no reducing gas having the reference value or more is detected, the process proceeds to step 59. Driving means 1
At 09, the ventilation fan 111 is stopped. If a value equal to or greater than the predetermined value is detected in step 58, the process proceeds to step 57, and the operation of the ventilation fan 111 is continued until the value falls below the predetermined value.

If the smoke concentration is determined in step 53 and no reducing gas having a value equal to or greater than the reference value previously input to the microcomputer 112 is detected, or if steps 59 and 55 are completed, It returns to step 51.

[0008]

In such a conventional automatic ventilator fan operating system, the smoke sensor 10 is used in order to improve the response.
4 is provided in the ventilation path, and when the ventilation fan 111 is operated, the smoke sensor 104 is exposed to the flow of the air sucked from the suction port 102, and as shown in FIG.
The output signal of the smoke sensor 104 is lower than at the time of one stop,
Actually, there is a problem that the ventilation fan does not stop even though the smoke density of the indoor air is clean below the reference value.

The present invention solves the above-mentioned problem, and even if an error occurs in the detection value of the smoke sensor due to the airflow of the air sucked from the suction port during the operation of the ventilation fan, the ventilation fan is accurately stopped in accordance with the indoor atmosphere. It is an object of the present invention to provide a ventilating fan automatic operation device that can perform the operation.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, an automatic operation device for a ventilation fan according to the present invention has a smoke detection sensor for detecting indoor smoke density, and a detection signal of the smoke detection sensor is changed to a voltage level. A smoke detection circuit, a smoke density determination means for comparing and determining a voltage level of the smoke detection circuit with a first reference value as a reference when the ventilation fan is stopped, or a second reference value as a reference during operation, A driving unit for determining whether to operate the ventilation fan based on the determination signal of the concentration determination unit, and a drive circuit for operating the ventilation fan based on the signal of the operation unit, a second reference value from the first reference value the high setting, when it is operated via the drive circuit, regardless of the detection signal from the smoke detection sensor, the operation for a certain period of time forcibly ventilating fan rotation ventilators is sufficiently stable airflow constant , Smoke density ne below the second reference value
Then, the operation of the ventilation fan is stopped .

[0011]

According to the present invention, when the ventilation fan is operated, the reference value for determination by the smoke density determination means becomes the second reference value, which is higher, and the smoke detection sensor is more dirty than it actually is. Even if the signal is output as described above, the error is corrected by the error, and when operating, regardless of the detection signal from the smoke detection sensor, the time required for the rotation of the ventilation fan to be sufficiently stable and the air flow to be constant is maintained Ventilation fan is operated and smoke
Next the concentration becomes the second reference value and this <br/> to stop the operation of the ventilating fan, it is possible to perform the determination of the stain correctly, it is automatically stopped right ventilators according to the actual atmosphere in the room.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. As shown in the figure, it is inserted and installed from a ceiling surface 8 to a ceiling space 9, and a discharge port 11 is provided on one side surface.
A smoke detection sensor 1 for detecting indoor smoke density is provided near the suction port 10 of the ventilation fan main body 7 having a suction port 10 on its lower surface. And this smoke detection sensor 1
Is output to the smoke detection circuit 2. The smoke detection circuit 2 converts the voltage into a voltage level corresponding to the smoke density and outputs the converted signal to the smoke density determination means 4. The smoke density determining means 4 compares the converted signal of the smoke detecting circuit 2 with a predetermined reference value and outputs a determination signal to the operating means 5. In some cases, the value is different, and the value during driving is higher. By increasing the reference value at the time of operation, it is possible to correct the error that the ventilating fan does not stop when it is detected that the fan is dirty even if it is actually clean by correcting the error, and to stop accurately. In driving means 5,
The operation and stop of the ventilation fan 7 are performed through the drive circuit 6 according to the determination signal of the smoke density determination means 4. Note that the microcomputer 3 implements the smoke density determination unit 4 and the operation unit 5.

The operation of the automatic ventilation fan operation device having the above configuration will be described below with reference to FIG.

First, in step 11, smoke density data is input from the smoke detection circuit 2 to the microcomputer 3 based on the signal from the smoke detection sensor 1. Next, in step 12, the presence or absence of the operation of the ventilation fan 7 is determined by the smoke density determination means 4 and if the operation is stopped, the process proceeds to step 13, where the smoke density is input to the microcomputer 3 in advance. If it is determined that the value is equal to or greater than the first reference value (a value only when the ventilation fan is stopped), the operation proceeds to step 14, the operation means 5 drives the ventilation fan 7 through the drive circuit 6, and proceeds to step 15 to turn the ventilation fan 7 on.
At a constant To time when the rolling is sufficiently stable and the airflow is constant
Start a timer that runs for a while. If it is determined in step 12 that the ventilation fan 7 is operating, the process proceeds to step 16, and in step 16, the To time is counted.
The ventilation fan 7 is forcibly operated until the fixed time elapses. During this time, the data from the smoke detection sensor 1 is ignored.

After a lapse of time T _0, the signal from the smoke detection sensor 1 is input again in step 17, and then, in step 18, the smoke density is changed to the second reference value (pre-input to the microcomputer 3). Exclusive value for ventilation fan operation)
If it is determined as follows, the process proceeds to step 19 and the driving means 4
To stop the ventilation fan 7 through the drive circuit 6. When it is determined in step 18 that the smoke density is equal to or higher than the second reference value, the process proceeds to step 17 and the operation of the ventilation fan 7 is continued through the drive circuit 6 until the smoke density becomes equal to or lower than the second reference value.

If it is determined in step 13 that the smoke density is equal to or less than the first reference value, the process returns to step 11 after step 19 or step 15 is completed.

[0017]

As is clear from the above embodiments, according to the present invention, the detection signal from the smoke detection sensor is compared and determined based on the first reference value or the second reference value, and the smoke density is determined based on the reference value. When it is determined that the value is higher than the value and the ventilation fan is operated,
Regardless of the detection signal from the smoke detection sensor, the ventilation fan is forced to operate for a certain period of time when the rotation of the ventilation fan is sufficiently stable and the air flow is constant, and when the smoke concentration falls below the second reference value, the ventilation
Since the operation of the fan is stopped , the determination of dirt can be performed correctly, and the correct ventilation fan can be automatically stopped in accordance with the actual atmosphere in the room, and a more accurate automatic ventilation fan operation device can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram of a ventilating fan automatic operation device according to an embodiment of the present invention.

FIG. 2 is a flowchart of the program.

FIG. 3 is a block diagram of a conventional automatic ventilation fan operation device.

FIG. 4 is a schematic configuration diagram of the smoke sensor.

FIG. 5 is a flowchart of the program.

FIG. 6 is an explanatory diagram showing an output voltage of the smoke sensor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Smoke detection sensor 2 Smoke detection circuit 4 Smoke density judgment means 5 Operating means 6 Drive circuit

Claims (1)

(57) [Claims] A smoke detection sensor for detecting indoor smoke density;
A smoke detection circuit that changes the detection signal of the smoke detection sensor to a voltage level, and a first reference value that is used as a reference when the ventilation fan is stopped or a second reference value that is used as a reference when the ventilation fan is stopped. Smoke density determination means to be compared by, a driving means for determining whether to operate the ventilation fan by the determination signal of the smoke density determination means, and a drive circuit for operating the ventilation fan based on the signal of this operation means, When the second reference value is set higher than the first reference value and the operation is performed via the drive circuit, the rotation of the ventilation fan is sufficiently stabilized regardless of the detection signal from the smoke detection sensor. Forcibly drive the ventilation fan for a certain period of time when
An automatic ventilation fan operation device configured to stop the operation of the ventilation fan when the smoke concentration falls below the second reference value .