JPH072751U - Gas supply cutoff device - Google Patents

Abstract

(57) [Summary] [Purpose] The shutoff valve 11 is closed and not used even when the ignition knob of the unused combustor is accidentally opened or the combustor fails while using gas. Prevent the outflow of raw gas from the combustor. [Composition] During use of gas, when no flame is detected when the flow rate sensor 17 of the combustor detects a flow rate, it is determined that there is a gas leak, the shutoff valve 11 on the pipe 9 is closed, and the supply of gas to the combustor is stopped. To do.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a gas supply cutoff device in which an on-off valve that is opened when a flame of a combustor is detected is provided in a gas supply path.

[0002]

[Prior art]

 As for the gas supply equipment to general households, for example, in the case of LP gas, the gas from the gas cylinder installed outdoors goes through the equipment such as the pressure regulator and the gas meter installed on the outdoor gas pipe, and the indoor It is generally supplied from a gas pipe to a combustor through a gas cock (main tap).

In such a gas supply facility, an open / close valve is provided on the outdoor gas pipe, and the residual gas in the gas pipe on the downstream side of the open / close valve is used to open the gas cock in the combustor after ignition. When the flame is detected, the on-off valve is opened to start the gas supply.On the other hand, when the flame is not detected despite the ignition operation, the on-off valve is closed to stop the gas supply and the combustion is started. There is a device that prevents outflow of raw gas from the vessel (see Japanese Patent Laid-Open No. 61-244374, etc.).

[0004]

[Problems to be solved by the device]

 However, in such a conventional device, the open / close valve remains open as long as the flame of the combustor is detected in the state where there is no pressure drop in the gas pipe or other abnormal signal such as an earthquake signal. , If the ignition knob of an unused combustor is accidentally opened a small amount while gas is in use, or if the combustor fails, the on-off valve does not close, and the gas gradually accumulates indoors. I will go.

Therefore, the present invention closes the indoors by closing the on-off valve even when the ignition knob for the unused combustor accidentally opens a small amount while the gas is being used or the combustor fails. The purpose is to prevent outflow of gas.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention firstly proposes an open / close valve provided in a gas supply passage, a plurality of combustors provided branching from a gas supply passage downstream of the open / close valve, Flame detecting means provided for each of the plurality of combustors to detect the flame of the combustor to open the on-off valve, and gas provided for each of the plurality of combustors to be supplied to the combustor. The flow rate detecting means for detecting the flow rate and the control means for closing the on-off valve when the flow rate detecting means of the combustor detects the flow rate without detecting the flame by the flame detecting means in any combustor. It is configured to have.

Secondly, an on-off valve provided in the gas supply passage, a plurality of combustors provided branching from the gas supply passage on the downstream side of the on-off valve, and combustion provided in each of the plurality of combustors Detecting means for detecting the flame of the burner to open the on-off valve, storage means for storing gas flow rate values of the plurality of combustors in advance, and upstream side of the plurality of combustors. And a total flow rate detection means provided in the gas supply path for detecting the total flow rate of the gas, and the total gas flow rate detected by the total flow rate detection means is the same as that of any combustor in which the flame detection means detects a flame. And a control means for closing the on-off valve when the total gas flow rate stored in the storage means is larger than the total value.

[0008]

[Action]

 According to the first configuration, when the flame detecting means in any combustor does not detect the flame and the flow detecting means of the combustor detects the flow rate, the open / close valve is closed and the gas supply is stopped. .

According to the second configuration, the total gas flow rate detected by the total flow rate detection means is based on the total value of the gas flow rates stored in the storage means of any combustor in which the flame detection means has detected the flame. When the number is high, the on-off valve is closed and the gas supply is stopped.

[0010]

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the overall configuration of a gas supply cutoff device according to an embodiment of the present invention. For example, in the case of LP gas, gas is supplied to a plurality of combustors installed indoors from a gas cylinder installed outdoors, and a combustor-side control device 1 is provided for each of these combustors. . The combustor-side control device 1 is connected to an AC100V power line 3 drawn indoors via an outlet 5. The gas leak alarm 7 installed indoors is also connected to the power line 3 through the outlet 5. A shutoff valve 11 as an open / close valve is provided on an outdoor gas pipe 9 installed outside the roof and connected to a gas cylinder, and a shutoff valve control device 13 for controlling the open / close of the shutoff valve 11 is also provided via the container 5. It is connected to the power line 3. The shutoff valve 11 has a function of detecting a pressure decrease in the pipe 9 and detecting an earthquake or a fire to shut off the flow passage in the gas pipe 9.

The combustor control device 1 includes a flame sensor 15 as a flame detecting means for detecting a flame generated in the combustor, and a flow rate sensor 17 as a flow detecting means for detecting a flow rate of gas supplied to the combustor. , A gas cock sensor 19 for detecting the open / closed state of a gas cock provided in an indoor gas pipe connected to the combustor 1, a controller 21 to which detection signals of these sensors 15, 17, 19 are input, and a controller 21 from the controller 21. A power line transport device 23 for outputting a control signal to the shutoff valve control device 13 by a power line transport system is provided. The gas leak alarm device 7 is provided with an alarm device main body 25 and a power line carrier device 27 that outputs a control signal from the alarm device main body 25 to the shutoff valve control device 13 by a power line carrier system. The shutoff valve control device 13 includes a controller 29 that controls opening and closing of the shutoff valve 11 based on signals sent from the combustor side control device 1 and the gas leak alarm device 7, and a power line transport device 31. The controller 29 constitutes a control means together with the controller 21 of the combustor side controller 1.

The control operation in the gas supply interrupting device configured as described above will be described based on the flowchart shown in FIG. In the normal mode in which gas can be used (step 201), when the gas cock on the gas pipe connected to the combustor is opened and turned on (step 203), the shutoff valve 11 is opened (step 205), and ignition is performed. It is judged whether or not the operation is performed and the flame sensor 15 detects the flame, that is, whether the flame is ignited (step 207). If ignition has not occurred here, the shut-off valve 11 is shut off after 3 seconds have elapsed after the shut-off valve 11 was opened (step 209) (step 211). This prevents the raw gas from flowing out of the combustor when the combustor is ignited but not ignited.

On the other hand, if ignition has occurred, it is determined whether or not the flow rate sensor 17 of another unused combustor has detected the gas flow rate (step 213). If there is a flow rate, the shut-off valve 11 is shut off (step 215), and it is possible that there is a gas leak from an unused combustor, and the combustor may malfunction. Take appropriate measures such as notifying the gas management center. When it is determined that there is no gas flow to the combustor that is not in use, it is determined whether or not there is another abnormality such as gas leakage from piping or the like (step 217).

If there is another abnormality, the shutoff valve 11 is shut off (step 215), and if there is no other abnormality, it is judged again whether or not the flame sensor 15 has detected the flame of the combustor (step 215). 219). If the flame is detected and the combustor being used is normally ignited, the process returns to step 213 to repeat the operation of determining the presence or absence of the gas flow rate in the unused combustor. If no flame is detected in step 219, the shutoff valve 11 is shut off (step 221). If 15 minutes have passed since the shutoff valve 11 was shut off (step 223) and the pressure inside the pipe 9 dropped (step 225), an abnormal mode was established because there was a gas leak in the pipe 9, and the fact was notified to the center. Take measures such as doing.

When the shut-off valve 11 is shut off due to the occurrence of an abnormality, it is possible to use the gas after confirming that the gas pipe 9 is normal by performing a safety return check. The control operation of the return safety confirmation is shown in the flow chart of FIG. After opening the shutoff valve 11 for 3 seconds (step 301), the shutoff valve 11 is closed (step 303). Next, it is determined whether the pressure in the pipe 9 has dropped (step 305). If there is a pressure drop here, it is judged that there is a gas leak in the pipe 9 and the abnormal mode is entered. If there is no pressure drop, the recovery safety confirmation time has elapsed (step 307) and then the normal mode is entered (step 309). .

FIG. 4 is a block diagram showing the overall construction of a gas supply interrupting device according to another embodiment of the present invention. This embodiment is different from the embodiment of FIG. 1 in that a gas flow sensor 33 as a total flow rate detecting means for detecting the total flow rate of gas is provided in the outdoor gas pipe 9, and each combustor side control device 1 is provided. The sensors provided are the flame sensor 15 and the gas cock sensor 19. Further, the flow rate value of each combustor is preset and stored in the controller 29 of the shutoff valve control device 13. That is, the controller 29 includes a storage means. In the operation of setting the flow rate of each combustor, as shown in the flowchart of FIG. 5, the combustor number is input (step 501), and the gas flow rate of the combustor corresponding to the input number is input (step 503).

In this embodiment, when the total flow rate of the gas detected by the flow rate sensor 33 is larger than the total flow rate value set in the controller 29 of the combustor in which the flame is detected, the flame is not detected. The shut-off valve 11 is shut off because there is a gas leak from the combustor used.

A control operation in such a gas supply interrupting device will be described based on a flowchart shown in FIG. The operation up to the flame detection operation at the time of ignition (step 207) is the same as the operation shown in FIG. 2, and then it is judged again whether or not the flame sensor 15 has detected the flame of the combustor (step 219). If a flame is detected, the total flow rate of the combustor in which the flame is generated is calculated (step 601), and the total flow rate of the gas detected by the flow rate sensor 33 at this time is calculated as the above-mentioned total. When the flow rate is exceeded (step 603), the shutoff valve 11 is closed (step 605) because there is a gas leak from the unused combustor, and the abnormal mode is set and the fact is notified to the center. Take the following measures. When the flame is not detected, the operation is shifted to the step 221 and thereafter for closing the shutoff valve 11 as in the case of FIG. In this embodiment as well, after the shutoff valve 11 is shut off due to an abnormality, the return safety confirmation operation as shown in FIG. 3 is performed.

[0020]

[Effect of device]

 As described above, according to the present invention, when the flame of the combustor is detected when the gas is used and the gas leaks from the unused combustor, the on-off valve is closed. Therefore, the safety in using gas is further improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an overall configuration of a gas supply cutoff device showing an embodiment of the present invention.

FIG. 2 is a flowchart showing a control operation in the gas supply cutoff device of FIG.

FIG. 3 is a flowchart showing a return safety confirmation operation in the gas supply interrupting device of FIG.

FIG. 4 is a block diagram showing an overall configuration of a gas supply cutoff device showing another embodiment of the present invention.

5 is a flowchart showing an operation of setting a gas flow rate of each combustor in the gas supply / interruption device of FIG.

FIG. 6 is a flowchart showing a control operation in the gas supply interrupting device of FIG.

[Explanation of symbols]

 9 Gas pipe 11 Shut-off valve 15 Flame sensor 17 Flow sensor 21, 29 Controller 33 Flow sensor

Claims (2)

[Scope of utility model registration request] 1. An on-off valve provided in a gas supply path, a plurality of combustors provided branching from a gas supply path downstream of the on-off valve, and a combustor provided for each of the plurality of combustors. Flame detection means for detecting a flame to open the on-off valve, flow rate detection means provided for each of the plurality of combustors to detect the flow rate of gas supplied to the combustor, and arbitrary combustion Supply means for shutting off the on-off valve when the flow rate detecting means of the combustor detects the flow rate without the flame detecting means in the vessel detecting the flame. 2. An on-off valve provided in a gas supply path, a plurality of combustors provided branching from a gas supply path downstream of the on-off valve, and a combustor provided for each of the plurality of combustors. Flame detection means for detecting a flame to open the on-off valve, storage means for storing gas flow rate values of the plurality of combustors in advance, and gas supply on the upstream side of the plurality of combustors The total flow rate detection means provided in the passage for detecting the total flow rate of the gas, and the total gas flow rate detected by the total flow rate detection means are stored in the storage means of any combustor in which the flame detection means detects a flame. And a control means for closing the on-off valve when the stored gas flow rate is larger than the total stored gas flow rate.