JPH0733802Y2 - Gas appliances security system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an improvement of a security system for household gas appliances.

[Prior Art] FIG. 3 is a configuration diagram showing a conventional security system for household gas appliances, in which 1 is a security controller, 2 is a gas sensor, 3 is a gas supply cutoff device, 4 is a gas meter, 5 Is a gas device, 6 is a gas cylinder, 7 is a signal line connecting the security controller 1 and the gas sensor 2, and 8 is a signal line connecting the security controller 1 and the gas supply cutoff device 3.

In the figure, when a gas leak occurs from the gas appliance 5,
When the gas sensor 2 detects the gas leak, it sends a signal of gas leak occurrence to the security controller 1. In response to the gas leak signal, the security controller 1 sends a cutoff signal to the gas supply cutoff device 3 to stop the gas supply from the cylinder 6.

[Problems to be Solved by the Invention] In the above-described conventional security system, when the gas sensor 1 outputs a gas leakage occurrence signal, the gas is immediately shut off. Therefore, for example, an insecticide spray agent is used near the gas sensor 1. Then, the gas sensor 1 senses it and outputs a gas leak occurrence signal to cut off the gas supply. For this reason, there has been a problem that the use of gas thereafter is blocked.

The present invention has been made in order to solve the above-mentioned problems of the conventional device, and when the gas is not used, the security system does not shut off the gas supply even if the gas leak occurrence signal from the gas sensor 1 is received. Is to provide.

[Means for Solving the Problems] In order to achieve the above object, a security system for a gas appliance according to the present invention provides an interface for inputting a signal from a gas leak detector and an interface for inputting flow rate data from a gas meter. Face, when the signal from the gas leak detector is input, the flow rate of the gas meter is detected, and if there is a flow rate, a true gas leak determination means that determines that there is a true gas leak and outputs a signal, The gas supply cutoff means for cutting off the gas supply based on the signal output from the true gas leakage determination means.

[Operation] In the present invention, the true gas leak determination means detects the flow rate of the gas meter when the signal from the gas leak detector is input, and if there is a flow rate, determines that there is a true gas leak. To output a signal, and the gas supply cutoff means cuts off the gas supply based on the signal output from the true gas leakage determination means, so that the gas supply is cut off even when no gas leakage occurs. This malfunction is prevented.

[Embodiment of the Invention] FIG. 1 is a block diagram of a security system showing an embodiment of the present invention, in which 1 to 8 are the same as or equivalent to those of a conventional apparatus, 9 is a security controller 1 and a gas meter 4
This is a signal line connecting with.

As shown in the figure, the security controller 1 and the gas meter 4 are provided with a signal line 9,
When the controller 1 receives the gas leak generation signal from the gas sensor 3, it checks the change in the meter value of the gas meter 4, and if there is a change, that is, if there is a gas flow rate, then the gas is in use and a true gas leak has occurred. The gas supply is shut off as if it occurred, but if the meter value does not change, the gas is not in use.Therefore, the gas leak occurrence signal is an erroneous signal, that is, it is determined that the gas is not a true gas leak. The supply will not be cut off.

FIG. 2 shows a flowchart of the above operation. When the gas sensor 2 detects a gas leak and sends a gas leak occurrence signal to the security controller 1 (step 10),
The security controller 1 checks the change in the meter value of the gas meter 4 (step 11). If there is a change in the meter value, it is judged that the gas is in use and that there is a true gas leak, and a cutoff signal is sent to the gas supply cutoff device 3. To shut off the gas supply (step 12). In step 11, if there is no change in the meter value, the gas is not being used. Therefore, even if the gas leak occurrence signal is input in step 10, it is determined that it is not a true gas leak, and the gas shutoff device 3 is shut off. No signal is output, and the process returns to step 10.

In this embodiment, the change in meter value is detected to check whether or not the gas meter is operating, but the present invention is not limited to this method and other methods may be used.

Further, although the present embodiment is an example of propane gas, the same function can be added to city gas.

[Effects of the Invention] As described above, the present invention detects the flow rate of the gas meter when the true gas leak determination means inputs the signal from the gas leak detector. If there is a gas leak, the gas supply cutoff means cuts off the gas supply based on the signal output from the true gas leak judgment means. A malfunction that the supply is cut off is prevented. Therefore, a highly reliable gas appliance security system can be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram of a security system for household gas appliances which is an embodiment of the present invention, FIG. 2 is a flow chart of its operation, and FIG. 3 is a block diagram of a conventional security system. In the figure, 1 is a security controller, 2 is a gas sensor, 3 is a gas supply cutoff device, 4 is a gas meter, 5 is a gas appliance, 6 is a gas cylinder, 7 is a signal line connecting the gas sensor 2 and the security controller 1, 8 Is a signal line connecting the gas supply cutoff device 3 and the security controller 1, and 9 is a signal line connecting the gas meter 4 and the security controller 1. The same reference numerals in the drawings indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] 1. An interface for inputting a signal from a gas leak detector and an interface for inputting flow rate data from a gas meter, and detecting a flow rate of the gas meter when a signal from the gas leak detector is input. If there is a flow rate, a true gas leak judging means for judging that there is a true gas leak and outputting a signal, and shutting off the gas supply based on the signal outputted from this true gas leak judging means A gas appliance security system including a gas supply cutoff means.