JP2611167B2 - Gas shut-off device for gas-using equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial application field> The present invention measures a CO concentration generated in a state where a combustion appliance for burning a gas is used by a CO measuring device, and determines a gas flow according to the CO concentration. The present invention relates to a gas shutoff method for a gas using facility for shutting off a road.

<Conventional technology> Conventionally, CO generated when combustion equipment burns incompletely
Is measured by installing a CO measuring device in a room or the like where a combustion appliance is used, and measuring the CO concentration in the room using the CO measuring device. Then, when the CO concentration becomes equal to or higher than a predetermined constant value (interruption level at which the gas flow path is shut off), an alarm is issued or the gas flow path is shut off to stop gas supply.

<Problems to be Solved by the Invention> The conventional gas shut-off method for gas-using equipment is to shut off the gas flow path and stop gas supply when the CO concentration exceeds a certain value while using a combustion device. I do.

However, if the CO concentration is kept below a certain value, the gas flow path will be shut off and the gas supply will not be stopped, so that people will continue to stay at the predetermined CO concentration, thus preventing accidents from occurring. I couldn't.

<Means for Solving the Problems> A gas shut-off device of a gas use facility according to the present invention has been made to solve the above-mentioned inconvenience. A shutoff valve disposed in the flow path for shutting off supply of gas to the plurality of combustion appliances, a flow sensor disposed in the gas flow passage for detecting a gas flow rate, and generated from the plurality of combustion appliances. When a CO measuring device for measuring the CO concentration and the CO concentration measured by the CO measuring device in a state where the flow rate signal is supplied from the flow sensor is equal to or higher than a predetermined shutoff level for shutting off the gas flow path. When the gas supply is stopped by operating the shut-off valve, and when the gas is below the shut-off level, the combustion device is continued to be used, t (time) = 300 × 2 / x (where x is a CO concentration. , Less than 300 ppm) Arithmetic processing means for operating the shut-off valve to stop gas supply.

<Embodiment> Hereinafter, a case where the present invention is applied to an LP gas CO generation device detection unit will be described.

FIG. 1 is a schematic block diagram of an embodiment of a CO generating device detecting means used in the present invention.

The CO generating device detecting means 1 is provided with a shutoff valve 3 in the middle of a gas flow path 2, and a gas meter 4 which is a flow rate sensor for detecting a flow rate of gas flowing through the gas flow path 2 downstream of the shutoff valve 3.
Is provided.

Note that a CO measuring instrument such as a CO
The sensor 5 is installed.

And a microcomputer 6 serving as an arithmetic processing means.
Is electrically connected to the gas meter 4 via the flow signal transmitter 7, and the CO sensor 5, the shutoff valve 3, the display unit 8
Are electrically connected. A battery 9 as a power supply is electrically connected to the microcomputer 6, and a return safety device for returning the shut-off valve 3 to the shut-off valve 3.
10 is connected.

The flow signal transmitter 7 converts a mechanical movement of the gas meter 8 into an electric signal every time the gas meter 8 makes one rotation.

The case where the flow signal transmitter 7 is provided in a film type gas meter will be described. The flow signal transmitter 7 includes a film driven by a gas flow, a magnet that rotates in conjunction with the movement of the film, A reed switch that repeats on / off by detecting the movement of the magnet. When the magnet rotates in accordance with the flow of gas, the magnet approaches or moves away from the reed switch, and the reed switch is turned on and off, and each time the membrane makes one reciprocation, that is, one revolution of the magnet makes one pulse. Transmit the flow rate signal.

 FIG. 2 shows the correspondence between gas consumption and flow rate classification.

The gas consumption can be specified depending on the combustion equipment used, for example, a stove is 0.3 kg / h, a bath combustion equipment is 1.2 kg / h, and a stove is 0.3 kg / h.

Therefore, if only the stove is used, the second category,
If only the bath burning appliance is used, it is classified into the eighth category, and if the stove and the bath burning appliance are used together, it is classified into the ninth category. Correspondence between this flow rate section and the combustion equipment used differs depending on each gas use facility.

However, since the combustion equipment used in each gas use facility is known in advance, the correspondence between the flow rate classification and the combustion equipment used can be specified for each gas use facility. In other words, if the gas consumption is just 0.3 kg / h, it is not known whether the stove is used or the stove is used. Relation), if it is a stove, rise from 0kg / h to 0.3kg / h
After maintaining 0.3 kg / h, it changes between 0 kg / h and 0.3 kg / h and finally reaches 0 kg / h, and the switching level is "weak".
For three stoves, "medium" and "strong (0.3kg / h)", the stove rises from 0kg / h to 0.3kg / h ("strong"), maintains 0.3kg / h, and then "weak" , "Medium" and "strong", and finally becomes 0 kg / h, so that the combustion equipment used can be specified by the gas consumption pattern.

In addition, as described above, the determination of whether a single burner is used or a plurality of burners is made in advance, as described above, the burners to be used at each gas use facility are known in advance, and a plurality of burners start using at the same time. It is rare that they are used at the same time with the start of use deviated, and the gas consumption (maximum gas consumption) of the burner is usually consumed at the start of use of the burner. Can be determined based on the gas consumption amount.

Therefore, by storing the patterns of the respective gas consumptions of the respective combustion appliances used in the microcomputer 6 or learning the respective patterns of the respective gas consumptions of the respective combustion appliances, the combustion appliances having the same gas consumption can be obtained. It is possible to determine which burning device is used and whether one or more burning devices are used.

In this embodiment, the case where the LP gas is used to discriminate into 13 sections is shown, but the number of sections is not limited to 13, and
The classification of gas consumption when other types of gas, for example, city gas or the like is used, is changed and implemented as appropriate.

The identification of the CO generating device, the generation of the alarm, and the stop of the gas supply by the CO generating device detecting means 1 will be described below.

Fig. 3 is a time chart when the gas consumption is 0.85 kg / h or more, and Fig. 4 is a time chart when the gas consumption is less than 0.85 kg / h. FIG. 5 is a flowchart, and FIG. 5 is a flowchart for explaining the procedure for implementing the present invention.

First, a description will be given of a case where a gas burner having a gas consumption of 0.85 kg / h or more is used.

In FIG. 3, when the gas consumption is 0.3 kg / h, the microcomputer 6 recognizes that only the stove is used, for example, by the above-described determination because the second section is used. When the gas consumption reaches 1.5 kg / h, the microcomputer 6 recognizes that the ninth section is used, and the stove and the gas burner with the gas consumption of 1.2 kg / h are used together. After that, when the gas consumption becomes 1.2 kg / h, the microcomputer 6 uses the eighth section, so the stove with the gas consumption of 0.3 kg / h is turned off, and only the bath combustion appliances are used. Recognize.

Then, when the combustion appliances are used in the above order, if CO is not detected in the second division and CO is detected in the ninth and eighth divisions, CO is generated from the bath combustion appliance. Since it is possible to specify that the CO generation device is present, the specified CO generating device (bath combustion device) is displayed on the display unit 8.

Note that, in order to prevent accidents due to exhaust gas when using a combustion device, it is mandatory to install an exhaust stack for a combustion device exceeding a certain gas consumption. For LP gas, if the stove exceeds 0.5 kg / h (fourth category or higher), the instantaneous water heater exceeds 0.85 kg / h (sixth category or higher), The minimum gas consumption of currently available combustion equipment is 0.7 kg / h), and the installation of a stack is mandatory.

Therefore, generation of CO in this section may be caused by breakage of the exhaust stack or backflow of exhaust gas from the exhaust stack. In other words, exhaust gas leaks due to poor connection of the exhaust stack, the wind is strong outdoors, exhaust gas does not discharge from the exhaust pipe, the exhaust overflows from the backwind, or by using a ventilation fan or range hood in the closed room In this case, the pressure in the room becomes negative and exhaust gas flows backward from the exhaust stack.

As described above, the setting standards for exhaust stacks differ depending on the type of combustion equipment. However, installation of exhaust stacks is not required for combustion equipment that consumes less than 0.5 kg / h of gas.

So, if the gas consumption exceeds 0.5kg / h,
Implementation procedures are distinguished.

First, the case where a gas burner having a gas consumption of 0.5 kg / h or more is used will be described.

In FIG. 3, when the CO concentration exceeds the cutoff level, the microcomputer 6 immediately sends a gas cutoff signal,
In response, the shut-off valve 3 shuts off the gas flow path 2 to stop the gas flow (FIG. 3 (A)).

Also, even if the CO concentration does not reach the cutoff level, if CO is continuously generated, the microcomputer 6 transmits a gas cutoff signal after a predetermined time elapses, and Accordingly, the shutoff valve 3 shuts off the gas flow path 2 to stop the gas flow (FIGS. 3 (B), (C),
(D)). This is because there is a risk that an accident may occur if CO is continuously leaked even if CO is generated at a low concentration.

 The relationship between the CO concentration and the time until gas shutoff is calculated by the following formula: t (time) = 300 × 2 / x (where x is the CO concentration and less than 300 ppm).

Next, the case where a gas burner having a gas consumption of less than 0.5 kg / h is used will be described.

In FIG. 4, when the gas consumption is 0.3 kg / h, the microcomputer 6 recognizes that only the gas stove is used, for example, by the above-described determination because the second section is used. Here, if a CO concentration equal to or higher than the cutoff level is detected, the specified CO generation device (gas stove) is displayed on the display unit 8.

If the gas consumption is less than 0.5 kg / h (third category or lower), it is not mandatory to install a stack.

Therefore, the generation of CO in this category means that CO is directly generated from the combustion equipment.

Then, when the CO concentration reaches a predetermined cutoff level, the microcomputer 6 sends a gas cutoff signal,
In response, the shutoff valve 3 shuts off the gas flow path 2 to stop the gas flow (dotted lines in FIGS. 4 (A), (B) or (C)). Also, even if the CO concentration does not reach the cutoff level, if the CO continues to be generated, the microcomputer 6 sends an alarm signal after a predetermined period of time, and responds accordingly. The display unit 8 generates an alarm prompting ventilation (solid line in FIG. 4 (C), (D)).

 The relationship between the CO concentration and the time until an alarm is generated is calculated by the following formula: t (time) = 300 × 2 / x (where x is the CO concentration and less than 300 ppm).

In this embodiment, the case where LP gas is used has been described. However, the present invention is not limited to this, and can be applied to other gases, such as city gas.

The display of the CO generating device on the display unit may be any display as long as the CO generating device can be specified, and is represented by, for example, a number, a pictorial symbol, or the like.

<Effects of the Invention> As described above, according to the present invention, the CO concentration measured by the CO measuring device in a state where the combustion appliance is used, that is, in a state where the flow rate signal is supplied from the flow rate sensor, The gas supply is stopped by operating the shut-off valve when the gas flow rate is equal to or higher than a predetermined shut-off level for shutting down the gas flow path, and when the gas flow rate is lower than the shut-off level, the combustion equipment is continuously used. The gas supply is stopped by operating the shut-off valve after the elapse of the specified time, so if the CO concentration is higher than the cut-off level, or even if the CO concentration is lower than the cut-off level, the generation of CO that causes an accident will occur. Can be detected at an early stage to prevent a serious accident from occurring.

Then, the use of the combustion equipment is detected by the flow signal from the flow sensor, and the CO measuring device measures the CO concentration generated from the plurality of combustion equipment. And can be manufactured at a low cost while simplifying the configuration.

[Brief description of the drawings]

Fig. 1 is a schematic block diagram of the CO generating device detection means, Fig. 2 is a diagram showing the correspondence between gas consumption and flow rate classification, and Fig. 3 is the time when a gas burner with a gas consumption of 0.5 kg / h or more is used. FIG. 4 is a time chart when a gas burner having a gas consumption of less than 0.85 kg / h is used, and FIG. 5 is a flow chart for explaining the procedure of implementing the present invention. In the figure, 2 ... gas flow path, 3 ... shut-off valve, 4 ... gas meter, 5 ... CO sensor, 6 ... microcomputer.

Claims (1)

(57) [Claims] A gas passage for supplying gas to the plurality of combustion appliances; a shutoff valve disposed in the gas passage for shutting off supply of gas to the plurality of combustion appliances; A flow sensor that is disposed and detects a gas flow rate; a CO measurement device that sets a CO concentration generated from the plurality of combustion appliances; and a measurement by the CO measurement device in a state where a flow signal is supplied from the flow sensor. When the CO concentration is equal to or higher than a predetermined shutoff level for shutting off the gas flow path, the shutoff valve is operated to stop the gas supply, and when the CO concentration is lower than the shutoff level, the use of the combustion appliance is continued. As a condition, t (time) = 300 × 2 / x (where x is a CO concentration and less than 300 ppm), and after a lapse of a time determined, an arithmetic processing means for operating the shutoff valve to stop gas supply, A gas shut-off device of a gas using facility comprising: