JPH0875201A - Automatic ventilation system - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a system for ventilating indoor air safely and automatically in response to leakage of flammable gas and generation of toxic gas. [Constitution] The concentration of city gas is measured by a city gas alarm device 3 installed indoors, and the concentration of carbon monoxide gas is measured by a CO sensor 5. City gas alarm 3 and CO sensor 5
The measurement data from is sent to the control unit 7 installed outdoors. The control unit 7 automatically controls the opening and closing and / or the opening of the small ventilation window 11 installed above the general window 9 according to the gas concentration or the gas concentration change rate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic ventilation system for safely and automatically ventilating indoor air in response to city gas leakage, carbon monoxide (CO) generation due to incomplete combustion and the like. It is about.

[0002]

2. Description of the Related Art Conventionally, there is a gas alarm system for issuing an alarm when city gas leaks or carbon monoxide (CO) is generated due to incomplete combustion. In this gas alarm system, after an alarm is issued, a window or the like is manually opened for ventilation to stop the gas generation source when possible.

[0003]

However, in the conventional gas alarm system, if an ordinary person notices the leakage of city gas by an alarm and uses an electric product such as a ventilation fan, there is a risk of explosion. There is very dangerous. In addition, when carbon monoxide (CO) poisoning due to incomplete combustion or the like impairs the consciousness and exercise of people inside the room, the person inside the room cannot open the window by himself. Even if the person outside the room notices the alarm, it cannot be easily opened if the window etc. is locked.

The present invention has been made in view of the above problems, and an object thereof is to keep indoor air safe and to cope with leakage of city gas, generation of carbon monoxide and the like. The purpose is to provide a system for automatic ventilation.

[0005]

In order to achieve the above-mentioned object, the present invention provides a measuring means for measuring a gas concentration in a room, and a gas concentration measured by the measuring means is a first reference value or more. Then, it is an automatic ventilation system characterized by comprising means for opening a window.

[0006]

[Function] The gas concentration in the room is measured, and the value of the measured gas concentration or the value of the gas concentration change rate calculated from the gas concentration at regular time intervals is determined based on the respective set reference values, Open and close the windows, adjust the opening of the windows.

[0007]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram of an automatic ventilation system 1 according to an embodiment of the present invention. The city gas alarm 3 installed in the room measures the city gas concentration, and the CO sensor 5 measures the carbon monoxide (CO) concentration. The measurement data from the city gas alarm device 3 and the CO sensor 5 is sent to the control unit 7. The control unit 7 controls the opening and closing of the small ventilation window 11 installed above the general window 9. In addition, the control unit 7 uses electricity, in order to avoid the risk of explosion due to the operation of the control unit 7 when the city gas leaks,
The control unit 7 is installed outdoors.

Next, a method of controlling the opening and closing of the ventilation small window 11 according to the gas concentration will be described with reference to the flow chart of FIG. 2 showing the automatic ventilation according to the gas concentration. For each gas concentration, it is judged in advance that it is necessary to open the window to ventilate, and that it is possible to open the window once and then start the ventilation and then close the window. Second
And the reference value of. At this time, the second reference value is set lower than the first reference value. This is because if the gas concentration was equal to or higher than the first reference value until immediately before, there is still a risk that the gas concentration will immediately rise again even if the gas concentration temporarily becomes equal to or lower than the first reference value. This is because there is a possibility. Therefore, the ventilation is continued without closing the window until the concentration becomes equal to or lower than the second reference value lower than the first reference value, which is considered to be a truly safe state.

The flow chart of FIG. 2 will be described below in sequence. First, the city gas alarms 3 and C will be continuously measured.
The O sensor 5 detects and measures the city gas concentration and the CO concentration (step 201). Next, the control unit 7 determines whether or not the city gas concentration is the first reference value A1 for the city gas concentration or more (step 202), and if it is the reference value A1 or more, opens the small ventilation window 11 (step). 203). If the city gas concentration is less than the first reference value A1, it is determined whether the CO concentration is not less than the first reference value B1 for CO concentration (step 2
04), if it is the reference value B1 or more, the small window 11 for ventilation is opened (step 203). After that, the city gas concentration and the CO concentration are continuously measured while keeping the small window 11 for ventilation open (step 201).

When the city gas concentration becomes less than the first reference value A1 in step 202 and the CO concentration becomes less than the first reference value B1 in step 203, at that time,
The city gas concentration is equal to or lower than a second reference value A2 lower than the first reference value for city gas concentration, and the CO concentration is equal to or lower than a second reference value B2 lower than the first reference value for CO concentration. It is determined whether or not (step 205), and then the opening / closing of the ventilation small window 11 is determined.

Therefore, once the city gas concentration becomes the first reference value A1 or more in step 202 and / or the CO concentration is the first reference value B1 or more in step 203, step 205 In the stage, the small window 11 for ventilation is opened, but here the city gas concentration becomes the second reference value A2 or less, which is lower than the first reference value for city gas concentration, and the CO concentration is for CO concentration. The ventilation small window 11 is closed for the first time when the second reference value B2, which is lower than the first reference value of 1 or less, is reached (step 206).

After the small window 11 for ventilation has been closed, the city gas concentration has never exceeded the first reference value A1 and the CO concentration has exceeded the first reference value B1. If it has not, the city gas concentration is naturally less than or equal to the second reference value A2 and the CO concentration is at the second reference value B2 in step 205 as well, so the small window 11 for ventilation is closed as it is. Keep it up.

FIG. 3 shows a small window 11 for ventilation depending on the gas concentration.
5 is a flowchart showing a method of adjusting the opening / closing degree of the.
First, the city gas alarm 3 and the CO sensor 5 detect and measure the city gas concentration and the CO concentration (step 30).
1). The control unit 7 has a built-in opening reference value of the opening / closing small window 11 according to the city gas concentration and the CO gas concentration.
In step 302, the small ventilation window 11 is opened and closed according to the city gas concentration and the CO concentration according to the opening reference value (step 302).

Next, a method of opening and closing the window according to the gas concentration change rate will be described. This is because even if the gas concentration is below a predetermined reference value, it is expected that the gas concentration will exceed the reference value in a short time if the concentration is rapidly increasing and the rate of change is large. Judgment is to start ventilation early. The control unit 7 is preset with a third reference value for the concentration change rate of each gas, which is determined to be necessary to open the small ventilation window 11 for ventilation.

Further, even if the gas concentration change rate is low, if the gas concentration rises very slowly, a dangerous state will result as a result. The method for opening and closing the window 11 includes a method for opening and closing the small ventilation window 11 according to the gas concentration as shown in FIG. That is, one of the city gas concentration change rate, the CO concentration change rate, the city gas concentration and the CO concentration
If at least one of them is greater than or equal to the determined reference value, the ventilation small window 11 is opened.

When the small ventilation window 11 is once opened, the subsequent opening / closing of the small ventilation window 11 is determined based on the second reference value of each gas.

A detailed description will be given below with reference to the flowchart of FIG. 4 showing the method of opening and closing the small ventilation window 11 according to the gas concentration change rate. First, the city gas alarm 3 and the CO sensor 5 are used to measure the city gas concentration and C at regular intervals.
The O concentration is measured, and the control unit 7 calculates the city gas concentration change rate and the CO concentration change rate based on the result (step 401).

When it is determined in step 402 that the rate of change in city gas concentration is not less than the third reference value A3 for city gas, the small window 11 for ventilation is opened (step 40).
3). In step 404, the CO gas concentration change rate is C
Even when it is determined that the value is the third reference value B3 or more in the case of O gas, the small window 11 for ventilation is opened (step 40).
3).

Further, step 402 and step 40
If the value of the rate of change in gas concentration is less than the third reference value in 4, the concentration of each gas is determined in step 405. This is step 402 and step 404.
Even if the rate of change in gas concentration is low, if the gas concentration rises very slowly, a dangerous state will result.

That is, at step 405, the city gas concentration is less than or equal to the first reference value A1 and the CO gas concentration is less than the first reference value A1.
It is determined whether or not the reference value B1 is less than or equal to, and both or
If any of the gas concentrations is greater than or equal to the respective first reference value, the small ventilation window 11 is opened (step 403).

The small window 1 for ventilation which was opened once in step 403
To close 1, in step 406, it is determined whether the city gas concentration is less than or equal to the second reference value A2 in FIG. 2 and the CO concentration is less than or equal to the second reference value B2 in FIG. (Step 405), if both or one of the concentrations exceeds the respective second reference value, the state in which the small ventilation window 11 is opened is maintained, and both the concentrations are equal to or less than the respective second reference values. If so, close the small window 11 for ventilation (step 40).
7).

This is step 402 or step 4.
According to the determination in 04, in step 403 the ventilation small window 11
If, after that, even if the rate of change in gas concentration, which once rises above the third reference value, falls below the third reference value, the gas concentration itself has already risen at that point, This is because the gas concentration may be large and dangerous even if the gas concentration change rate is small. Further, even when the ventilation small window 11 is opened by the determination in step 405, it is determined in step 406 whether or not the ventilation small window 11 is closed based on the second reference value of the concentration of each gas.
This is based on the same reason as in the case of FIG.

In step 405, city gas concentration and CO
When both the concentrations are less than the reference value, all values including the rate of change in city gas concentration and the rate of change in CO concentration are less than the respective reference values. At that time, the small ventilation window 11 is open when any of the values was equal to or higher than the reference value at the time of the determination immediately before, but since all the values were below the reference value, the air in the room was The ventilation small window 11 is closed when it is judged that the normal state is restored (step 40).
7). At the stage of step 406, the city gas concentration and the CO concentration are below the respective second reference values A2 and B2,
When the small ventilation window 11 is already closed, it means that the air in the room is kept in a normal state, and the small ventilation window 11 is closed as it is. In any case, the process returns to step 401, the gas concentration measurement and the calculation of the gas concentration change rate are repeated, and the safety is continuously monitored.

FIG. 5 is a flowchart showing a method of adjusting the opening / closing amount of the ventilation small window 11 according to the gas concentration change rate. First, the city gas alarm 3 and the CO sensor 5 measure the city gas concentration and the CO concentration at regular intervals, and the control unit 7 determines the city gas concentration change rate and the CO concentration based on the results.
The concentration change rate is calculated (step 501). Next, FIG.
In addition, the city gas concentration change rate, the CO gas concentration change rate, the city gas concentration, and the CO concentration are comprehensively determined by adjusting the determination criteria described in FIG. 4 and the opening degree of the ventilation small window 11 is adjusted ( Step 502).

In any of FIG. 2, FIG. 3, FIG. 4 and FIG. 5, if the city gas concentration and CO concentration are still high even if the ventilation small window 11 is opened, an alarm device (not shown) is used. ) To issue an alarm. Further, when the city gas concentration and / or the city gas concentration change rate is higher than a predetermined reference value, it is also linked with a device (not shown) that shuts off the gas supply.

In the above-described embodiment, the small ventilation window 11 is automatically closed when the gas concentration decreases, but for safety, the small ventilation window 11 is opened once. May not be closed unless manually assisted.

As described above, according to the present embodiment, when the measured value of each gas concentration and / or the calculation result of the gas concentration change rate is determined to be higher than the reference value set for each gas, ventilation is performed. The small window can be opened automatically to start ventilation in the room. In addition, when each standard value is exceeded, depending on the size of the gas concentration or the gas concentration change rate,
It is also possible to adjust the opening of the small window for ventilation.

In this embodiment, a system capable of detecting and measuring two types of city gas and CO gas has been described, but a system corresponding to only one of them can be similarly constructed. It is also possible to combine other types of combustible gas and / or toxic gas, etc., in an arbitrary number of types to configure a system capable of coping with them. In that case, depending on whether the target gas is lighter or heavier than the air in the room, the ventilation window may be installed at the top of the room, at the bottom of the room, or both.

[0029]

As described above in detail, according to the present invention, there is provided a system for safely and automatically ventilating indoor air in response to leakage of combustible gas, generation of toxic gas and the like. can do.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an automatic ventilation system 1.

FIG. 2 Flow chart showing automatic ventilation according to gas concentration

FIG. 3 is a flowchart showing adjustment of the opening degree of the ventilation small window 11 based on the gas concentration.

FIG. 4 is a flowchart showing a method for opening and closing the ventilation small window 11 based on a gas concentration change rate.

FIG. 5 is a flowchart showing adjustment of the opening degree of the ventilation small window 11 based on the gas concentration change rate.

[Explanation of symbols]

 1 ... Automatic ventilation system 3 ... City gas alarm 5 ... CO sensor 7 ... Control unit 9 ... Window 11 ... Small ventilation window

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuya Fujisawa 2-5-3-305 Nukii, Nerima-ku, Tokyo (72) Inventor Toshige Masuko 2174 C-608, Koyo-cho, Tokorozawa, Saitama Prefecture (72) Inventor Kanako Nakayama 7-39-10 Koganehara, Matsudo City, Chiba Prefecture (72) Inventor Mitsunori Komaki 2-4-17 Sarue, Koto-ku, Tokyo (72) Inventor Satoshi Morita 6-9-5 Chuo, Ota-ku, Tokyo

Claims (8)

[Claims] 1. An automatic system comprising: measuring means for measuring a gas concentration in a room; and means for opening a window when the gas concentration measured by the measuring means exceeds a first reference value. Ventilation system. 2. The automatic ventilation system according to claim 1, further comprising means for closing the window when the gas concentration measured by the measuring means becomes equal to or lower than a second reference value. 3. A measuring means for measuring the gas concentration in the room, and a control means for controlling the opening of the window according to the gas concentration measured by the measuring means. The automatic ventilation system described in 1. 4. A measuring unit for measuring a gas concentration in a room, a calculating unit for calculating a temporal change rate of the gas concentration measured by the measuring unit, and a temporal change of the gas concentration calculated by the calculating unit. The automatic ventilation system according to claim 1, further comprising: a means for opening a window when the rate becomes equal to or higher than a third reference value. 5. A measuring unit for measuring the gas concentration in the room, a calculating unit for calculating a temporal change rate of the gas concentration measured by the measuring unit, and a temporal change of the gas concentration calculated by the calculating unit. The automatic ventilation system according to claim 1 or 4, further comprising: a control unit that controls the opening of the window according to the rate. 6. The automatic ventilation system according to claim 1, wherein the gas concentration is city gas concentration. 7. The automatic ventilation system according to claim 1, wherein the gas concentration is a CO gas concentration. 8. The automatic ventilation system according to claim 1, wherein the gas concentrations are city gas concentration and CO gas concentration.