JP2013204677A - Gas supply cutoff system and gas supply cut off device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas supply system in which earthquake countermeasures can be taken easily and inexpensively for a gas supply route part from a gas supply source to a gas meter for each house.SOLUTION: In a gas supply system 1, a gas supply cutoff device 7 equipped with an earthquake sensing cutoff function is connected to a gas supply pipe 6 supplying gas from a gas supply source to each house. Gas supply from the gas supply cutoff device 7 to a downstream side is cut off in the event of an earthquake. An earthquake sensing cutoff function can be added to each gas supply route part from the gas supply source to the individual house by setting the sensitivity of a seismoscope 38 of the gas supply cutoff device 7 at a proper value and by connecting the gas supply pipe 6 to a proper position. Since the seismoscope 38 and a cutoff valve 37 are integrally incorporated into the gas supply cutoff device 7, it is not necessary to perform remote control to the cutoff valve arranged at a different position by monitoring signals of the seismoscope over a communication line, so that an earthquake sensing cutoff function can be added to an existing gas supply system by connecting the gas supply cutoff device.

Description

  The present invention relates to a gas supply system that supplies gas to each house in an apartment house, and more particularly, to a gas supply cutoff system and a gas supply cutoff device having a function of cutting off gas supply when an earthquake occurs.

  In a gas supply system of an apartment house, for example, an LP gas supply system, LP gas stored in a plurality of gas cylinders is supplied to a gas supply pipe through a regulator and distributed to each house through the gas supply pipe. The gas used in each house is measured by a gas meter installed in each house. Gas meters with a seismic shut-off function are known, and when an earthquake occurs, the shut-off valve built in the gas meter of each house is closed to prevent secondary disasters caused by gas leaks.

  However, earthquake countermeasures are not taken in the gas supply path portion between the regulator of the LP gas supply source and the gas meter of each house. When an earthquake occurs, the gas piping in this gas supply path is damaged, and the leaked gas may accumulate, causing a secondary disaster such as a fire or explosion.

  Patent Document 1 proposes an earthquake-sensitive gas shut-off system used in a gas supply system that supplies gas to each house from a gas supply base. In this seismic gas shut-off system, seismic means are installed at both the gas supply base and each door, and when any of them detects an earthquake, the control means shuts off the gas supply base side shut-off valve and each door gas meter side. It is configured to shut off any of the valves. Further, Patent Document 2 proposes a seismic gas shut-off system in which seismic means and a shut-off valve are arranged in front of a branch pipe that distributes gas to a gas meter of each house. Such a system can be used for earthquake countermeasures in the gas supply path section between the regulator of the LP gas supply source and the gas meter of each house.

Japanese Patent No. 3240938 Japanese Patent No. 3289619

  In the systems disclosed in Patent Documents 1 and 2, the seismic means at a plurality of locations arranged in each part of the gas supply system are monitored by the control means via the communication line, and when an earthquake is detected, the control means is connected to the communication line. Each shut-off valve is remotely controlled via a gas to prevent gas leakage. Such systems are generally expensive to install and may not function well if the communication network is interrupted during an earthquake. In addition, it is difficult to easily and inexpensively attach to an existing gas supply system.

  SUMMARY OF THE INVENTION In view of the above, the problem of the present invention is to provide a gas supply shut-off system capable of easily and inexpensively taking measures against earthquakes in a gas supply path section from a gas supply source to a gas meter of each house, and the system. The present invention is to propose a gas supply shut-off device suitable for use in an automobile.

In order to solve the above problems, the gas supply cutoff system of the present invention is:
A gas supply source installed in the housing complex;
Each house gas meter installed in each house of the apartment house,
A gas supply pipe for distributing gas from the gas supply source to each house via each house gas meter;
In each house, each house gas pipe for guiding the gas supplied via each house gas meter to the gas consuming equipment,
A gas supply shut-off device interposed at least in the part of the gas supply pipe,
Each door gas meter includes an in-meter gas passage communicating with the gas supply pipe and the respective door gas pipe, an in-meter shut-off valve for shutting off the in-meter gas passage, and an earthquake exceeding a predetermined gull value. An in-meter seismic device set to generate a seismic signal, and an in-meter control circuit that shuts off the in-meter gas passage by driving the in-meter shut-off valve when the seismic signal is input And are built-in,
The gas supply shut-off device includes an in-device gas passage defining a part of the gas supply pipe, an in-device shut-off valve for shutting off the in-device gas passage, and an earthquake exceeding a predetermined gull value. And an in-device control circuit configured to drive the in-device shut-off valve to shut off the in-device gas passage when the seismic signal is input. It is characterized by having.

  In the present invention, the gas supply from the gas meter to the downstream side is shut off at each door at the time of the occurrence of an earthquake by the seismic sensing cutoff function of the gas meter at each door. The gas supply pipe that supplies gas from the gas supply source to each house has a gas supply shut-off device with an anti-seismic shut-off function, so that the gas supply from the gas supply shut-off device is shut off downstream when an earthquake occurs. Is done. In addition, the seismic cutoff of the gas meter at each house and the seismic cutoff of the gas supply cutoff device operate independently. Set the sensitivity of the shock absorber of the gas supply shut-off device with the seismic shut-off function to an appropriate value, and connect the gas supply shut-off device to an appropriate position of the gas supply pipe, so that A seismic isolation function can be added to the gas supply path to In addition, the gas supply shut-off device has a built-in seismic device and shut-off valve, so the seismic device signal is monitored via a communication line to remotely control the shut-off valve located at another position. There is no need. Furthermore, the seismic isolation function can be added to an existing gas supply system simply by connecting a gas supply cutoff device to the gas supply pipe. Therefore, it is possible to easily and inexpensively construct a gas supply system in which earthquake countermeasures are taken.

  Here, the basic structure is the same for the gas meters of various sizes such as the above-mentioned individual gas meters and larger-sized commercial gas meters. Although the meter cases have different dimensions, the upper case and the upper case A lower case attached to the lower end opening of the gas sensor, the gas passage in the meter is formed inside the upper case, and a shut-off valve in the meter and a seismic instrument in the meter are arranged in the upper case A gas inlet side connecting pipe and a gas outlet side connecting pipe of the gas passage in the meter are attached to the surface of the upper case, and a measuring unit for measuring a gas flow rate is built in the lower case. . Therefore, it is desirable to configure the gas supply cutoff device using the components of the gas meter having this configuration, because the manufacturing cost of the gas supply cutoff device can be reduced, and the gas supply system can be constructed at a lower cost.

  For example, the device case of the gas supply shut-off device can be constituted by an upper case of each door gas meter, a case main body of a common part, and a sealing plate that seals a lower end opening of the case main body. Further, the in-device shutoff valve and the in-device control circuit of the gas supply shut-off device can be made common parts with the in-meter shut-off valve and the in-meter control circuit of each house gas meter, respectively.

  The gas supply shut-off device preferably includes a driving battery power source, for example, a lithium battery. The gas supply cutoff device can be connected to a pipe portion where a commercial power supply cannot be used, and can be connected without performing power supply wiring.

  Furthermore, a plurality of gas supply cutoff devices can be connected to the gas supply pipe. Even when a seismoscope with the same sensitivity is installed, even if one detects an earthquake, the other may not detect an earthquake, depending on the installation location, installation error, machine difference, and the like. If a plurality of gas supply shut-off devices are installed, the gas supply pipe can be shut off reliably and secondary disasters caused by gas leakage can be prevented.

Next, the present invention is a gas supply cutoff device used in the above gas supply cutoff system,
From the case main body which is a common part with the upper case in the gas meters of different sizes provided with portions corresponding to the respective portions of the respective door gas meters or the respective door gas meters, and a sealing plate which seals the lower end opening of the case main body A device case,
An in-device gas passage formed inside the device case;
Having a built-in component built in the device case,
The built-in component includes an in-device shut-off valve for shutting off the in-device gas passage, an in-device seismic device set to generate a seismic signal due to an earthquake exceeding a predetermined gull value, An in-device control circuit that drives the in-device shut-off valve to shut off the in-device gas passage when a signal is input, and a driving battery power source;
Of the device shut-off valve and the device control circuit, at least the device shut-off valve is a common component with the meter shut-off valve in each door gas meter or a gas meter having a different size from each door gas meter. It is said.

  Most of the parts of the gas supply shut-off device with this configuration are the same parts as the gas meter components of each house gas meter, commercial gas meter, and other sizes of gas meters. Can be manufactured. In addition, as with a gas meter, it can be connected to any position of the gas supply pipe, so by connecting a gas supply cutoff device to the required gas supply path portion, the gas supply path portion can be simplified. It is extremely convenient because it can provide a seismic cutoff function at low cost.

It is a schematic block diagram which shows the LP gas supply system of the apartment house to which this invention is applied. It is explanatory drawing which shows each door gas meter of FIG. (A) is the upper surface side perspective view of the gas supply interruption | blocking apparatus of FIG. 1, (b) is the bottom surface side perspective view. (A) is a top view of the gas supply interruption | blocking apparatus of FIG. 3, (b) is the front view, (c) is the side view.

  Embodiments of a gas supply system to which the present invention is applied will be described below with reference to the drawings.

  FIG. 1 is a schematic configuration diagram showing an LP gas supply system for an apartment house according to the present embodiment. The LP gas supply system 1 includes an LP gas supply source 3 installed in the apartment house 2, and a door gas meter 5 installed in each house 4 (4-1, 4-2, 4-3...) Of the apartment house 2. And a gas supply pipe 6 for distributing LP gas from the LP gas supply source 3 to each door 4 via each house gas meter 5, and one unit interposed in the LP gas supply source 3 side of the gas supply pipe 6. The gas supply cutoff device 7 is provided.

  The LP gas supply source 3 includes a plurality of LP gas cylinders 8 and a regulator 9 that supplies LP gas supplied from each of these LP gas cylinders 8 to the gas supply pipe 6 side at a constant pressure. . Since the configuration of the adjuster 9 is known, a detailed description thereof will be omitted. Each door 4 is provided with a door gas pipe 11 for guiding LP gas supplied via the door gas meter 5 to various gas consuming devices 10 such as a gas stove 10-1, a water heater 10-2, and a stove 10-3. ing.

  The LP gas supply system 1 includes a communication transmission device 12, and the transmission device 12 communicates with the monitoring center 14 via the communication line 13. In addition, the transmission device 12 communicates with the regulator 9, the gas supply cutoff device 7, and each door gas meter 5, and transmits the state of each of these parts, the gas measurement value, and the like to the monitoring center 14. Of course, the LP gas supply system 1 may be a system that does not include the communication transmission device 12. For example, in the case of a city gas gas meter, the built-in circuit board is not equipped with a communication function, and the circuit board used in the city gas gas meter may be used as the circuit board of the gas supply cutoff device 7. is there.

  Referring to FIG. 2, each house gas meter 5 is a so-called microcomputer gas meter with a built-in microcomputer, and the meter case 21 has an upper case 22 and a lower part attached to a lower end opening 22 a of the upper case 22. And a case 23. A gas inlet side connecting pipe 22b and a gas outlet side connecting pipe 22c are integrally formed on the upper surface of the upper case 22, and a rectangular display plate 24 is attached to the front face thereof. A rectangular rear opening (not shown) is formed on the upper side of the rear face, and the rear opening is sealed by a rear plate (not shown) attached detachably thereto. The lower case 23 incorporates a measuring unit (not shown) for measuring the gas flow rate, and a liquid crystal display 25 is attached to the front surface thereof.

  Inside the upper case 22, an in-meter gas passage 26 that connects between the gas inlet side connecting pipe 22b and the gas outlet side connecting pipe 22c is integrally formed. In the meter gas passage 26, a meter shut-off valve 27 for shutting off the gas passage 26 is arranged. Further, in the lower case 23, an in-meter seismic device 28 and an in-meter seismic device 28 that drives the in-meter shut-off valve 27 and shuts off the in-meter gas passage 26 when receiving a seismic signal from the in-meter seismic device 28. A shut-off control circuit (in-meter control circuit) and a control board 29 on which other gas metering control circuits are mounted are arranged.

  As shown in FIGS. 3 and 4, the device case 31 of the gas supply cutoff device 7 includes a case body 32 and a sealing plate 33 that seals the lower end opening 32 a of the case body 32. The case main body 32 is a common part with the upper case 22 of a commercial gas meter larger than each house gas meter 5, and a gas inlet side connecting pipe 32b and a gas outlet side connecting pipe 32c are arranged on the upper surface thereof. A rectangular rear opening 32d is formed on the upper side of the rear surface. The back opening 32d is sealed by a back plate 35 that is detachably attached thereto. A display board 34 is attached to the front surface of the case body 32. The gas meter for business use has the same structure as the gas meter 5 for each house, and the meter case is composed of an upper case and a lower case attached to the lower end opening of the upper case. A gas inlet side connecting pipe and a gas outlet side connecting pipe are integrally formed on the upper surface of the upper case, and a display plate is attached to the front face thereof.

  In the apparatus case 31, an in-apparatus gas passage 36 that connects the gas inlet side connecting pipe 32b and the gas outlet side connecting pipe 32c is integrally formed. Further, inside the device case 31, an in-device shutoff valve 37 for shutting down the in-device gas passage 36 and an inside of the device set to generate a seismic signal due to an earthquake exceeding a predetermined gull value. A control circuit including a seismic device 38 and a seismic shut-off control circuit (in-device control circuit) that drives the in-device shut-off valve 37 to shut off the in-device gas passage 36 when a seismic signal is input is mounted. The control board 39 is disposed.

  A battery power source for driving is mounted inside the device case 31 of the gas supply cutoff device 7. In this example, a lithium battery (not shown) used as a driving power source for each gas meter 5 is mounted as a driving power source.

  Thus, the case main body 32 in which the in-device gas passage 36 is formed in the gas supply shut-off device 7 and the in-device shut-off valve 37 are common parts to the upper case and the in-meter shut-off valve of the commercial gas meter, respectively. It is. The seismic control circuit on the gas meter side and the seismic control circuit of the gas supply shut-off device 7 may be a common circuit. When the gas supply shut-off device 7 is shared with the components of each gas meter 5, the case main body 32 in which the in-device gas passage 36 in the gas supply shut-off device 7 is formed, and the in-device shut-off. The valve 37 becomes a common part with the upper case 22 of each door gas meter 5 and the shut-off valve 27 in the meter, respectively.

  Next, the in-meter seismic device 28 of each gas meter 5 and the in-device seismic device 38 of the gas supply cutoff device 7 have different gull values for generating the seismic signals. In this example, the in-device seismic device 38 is set to generate a seismic signal by an earthquake with a higher gull value than the in-meter seismic device 28. In other words, the in-meter seismic device 28 on the side of each gas meter 5 is set so that the gas shut-off operation is performed by generating a seismic signal with a smaller earthquake. The in-device seismic device 38 can be set to generate a seismic signal by an earthquake with a lower gull value than the in-meter seismic device 28. It is also possible to set the in-device seismic device 38 and the in-meter seismic device 28 so as to generate a seismic signal by an earthquake having the same gull value.

  Further, various alarm devices such as a gas leak alarm device, a CO alarm device, and a fire alarm device can be connected to the gas supply cutoff device 7. In this way, when an alarm signal is generated from these alarm devices, the gas supply shut-off device 7 is driven to stop the supply of gas, so that a safer gas supply system can be constructed.

  Here, the in-device seismic device 38 of the gas supply cutoff device 7 is screwed to a mounting seat (not shown) formed inside the case main body 32. When the back plate 35 attached to the back surface of the case body 32 is removed, the in-device seismic device 38 can be accessed through the exposed back surface opening 32d, and the replacement work can be performed. By preparing the in-device seismic device 38 having different sensitivities, the seismic device having the most suitable sensitivity can be attached to the installation location of the gas supply cutoff device 7. In addition, it is possible to easily replace the seismoscope to change the sensitivity.

  As the in-meter seismic device 28 and the in-device seismic device 38, a steel ball having a predetermined mass resting on a mortar-shaped pedestal surface rolls due to vibration caused by the earthquake and moves away from the pedestal surface. The thing of the structure which detects an earthquake using can be used. A seismoscope having this structure is known and disclosed in, for example, Japanese Patent Application Laid-Open Nos. 57-76421, 08-50055, and 09-166480. In the case of the seismoscope having this structure, the sensitivity can be changed by changing the inclination angle of the pedestal surface on which the steel ball is placed, the inner diameter of the circular hole in which the bottom is formed, and the like. Of course, it is also possible to use a seismic instrument having a structure other than this.

  In the LP gas supply system 1 configured as described above, an earthquake occurs, and the acceleration of vibrations acting on the in-meter seismic device 28 and the in-device seismic device 38 has exceeded the preset gal value. In some cases, a seismic signal is generated. If the gal value is lower than the set gal value of the in-device seismic device 38 of the gas supply shut-off device 7 and is greater than the gal value of the in-meter seismic device 28 of each gas meter 5, only the in-meter seismic device 28 is used. A seismic signal is output, and the meter shutoff valve 27 is driven to shut off the meter gas passage. As a result, the gas supply from the gas meter 5 to the downstream side is shut off at each door, and even if the gas piping at each door is damaged by an earthquake, secondary disasters such as a gas leak and the accompanying fire can be prevented.

  If a vibration with a gull value larger than the set gull value acts on the in-device seismic device 38 of the gas supply cutoff device 7 due to an earthquake, both the in-meter seismic device 28 and the in-device seismic device 38 will vibrate. A signal is generated, and the gas supply is cut off at the upstream side of the gas supply pipe. Therefore, it is possible to prevent a disaster such as a gas supply pipe from being damaged by an earthquake, gas leakage, retention of leaked gas, and fire due to ignition of the retained gas.

  Here, the vibration generated by the earthquake differs depending on the installation location. As a result, although there is no significant vibration at the place where the gas supply shut-off device 7 is installed, there is a large vibration at the location downstream of the gas supply pipe, for example, where the branch pipe portion to each door is located. May occur. In this case, there is a possibility that the downstream portion of the gas supply pipe is damaged and gas leakage occurs. In order to surely prevent such an adverse effect, for example, as shown by an imaginary line in FIG. 1, a gas supply shut-off device 7 is connected to a portion on the upstream end side of the gas supply pipe, and a gas supply having the same configuration is provided. The shut-off device 7A may be connected to the downstream portion of the gas supply pipe 6. The sensitivity of the seismic devices of these gas supply shut-off devices 7 and 7A may be the same, but as a different sensitivity, the downstream side may be shut off by small vibrations.

  The above example relates to the LP gas supply system, but the present invention is naturally applicable to a gas supply system that supplies a gas other than LP gas. In the above example, the gas supply cutoff device 7 is connected to the gas supply pipe. At the same time, the gas supply cutoff device 7 is connected to the gas piping of each house (that is, connected to the downstream side of each gas meter). It is also possible to provide a seismic isolation function to a gas pipe connected to a specific gas consuming device or gas consuming appliance.

DESCRIPTION OF SYMBOLS 1 LP gas supply system 2 Apartment house 3 LP gas supply source 4 Each house 5 Each house gas meter 6 Gas supply pipe 7, 7A Gas supply cutoff device 8 LP gas cylinder 9 Regulator 10 Gas consumption apparatus 11 Each house gas piping 12 Transmission apparatus 13 Communication line 14 Monitoring center 21 Meter case 22 Upper case 22a Lower end opening 22b Gas inlet side connection pipe 22c Gas outlet side connection pipe 23 Lower case 24 Display panel 25 Liquid crystal display 26 Gas passage 27 in meter 27 Shut-off valve 28 Meter seismometer 29 Control board 31 Device case 32 Case body 32a Lower end opening 32b Gas inlet side connection pipe 32c Gas outlet side connection pipe 32d Rear opening 33 Sealing plate 34 Display plate 35 Back plate 36 In-device gas passage 37 In-device shut-off valve 38 In-device Sensor 39 Control board

Claims (6)

A gas supply source installed in the housing complex;
Each house gas meter installed in each house of the apartment house,
A gas supply pipe for distributing gas from the gas supply source to each house via each house gas meter;
In each house, each house gas pipe for guiding the gas supplied via each house gas meter to the gas consuming equipment,
A gas supply shut-off device interposed at least in the part of the gas supply pipe,
Each of the gas meters includes a gas passage in the meter communicating with the gas supply pipe and the gas pipes in the door, a shut-off valve in the meter for shutting off the gas passage in the meter, and an earthquake exceeding a predetermined gull value. An in-meter seismic device set to generate a seismic signal, and an in-meter control circuit that drives the in-meter shut-off valve to shut off the in-meter gas passage when the seismic signal is input; With
The gas supply shut-off device is set to generate a seismic signal by an in-device gas passage, an in-device shut-off valve for shutting off the in-device gas passage, and an earthquake exceeding a predetermined gull value. A gas supply cutoff comprising: an in-device seismic device; and an in-device control circuit that drives the in-device shut-off valve when the seismic signal is input to shut off the in-device gas passage. system. In claim 1,
The meter case of each door gas meter includes an upper case and a lower case attached to the lower end opening of the upper case,
The gas passage in the meter is formed in the upper case, a shut-off valve in the meter and a seismic instrument in the meter are disposed in the upper case, and the gas in the meter is disposed on the surface of the upper case. A gas inlet side connecting pipe and a gas outlet side connecting pipe of the passage are attached, and a measuring unit for measuring a gas flow rate is arranged in the lower case,
An apparatus case of the gas supply shut-off device includes an upper case and a common part case main body in the gas meters of different sizes provided with portions corresponding to the respective door gas meters or the respective portions of the respective door gas meters, and the lower end opening of the case main body. And a sealing plate that seals
Of the in-device shut-off valve and the in-device control circuit, at least the in-device shut-off valve is a common component with the in-meter shut-off valve of the gas meter. In claim 1,
The meter case of each door gas meter includes an upper case and a lower case attached to the lower end opening of the upper case,
The gas passage in the meter is formed in the upper case, a shut-off valve in the meter and a seismic instrument in the meter are disposed in the upper case, and the gas in the meter is disposed on the surface of the upper case. The gas inlet side connecting pipe and the gas outlet side connecting pipe of the passage are attached, and the lower case has a built-in measuring unit for measuring the gas flow rate,
The apparatus case of the gas supply shut-off device is composed of a case body that is a common part with the upper case, and a sealing plate that seals the lower end opening of the case body,
Of the in-device shut-off valve and the in-device control circuit, at least the in-device shut-off valve is a common component with the in-meter shut-off valve. In any one of claims 1 to 3,
The gas supply shut-off system includes a battery power source for driving. In any one of claims 1 to 4,
A gas supply cutoff system, wherein a plurality of gas supply cutoff devices having the same sensitivity are connected in series to the gas supply pipe. A gas supply cutoff device used in the gas supply cutoff system according to claim 2 or 3,
From the case main body which is a common part with the upper case in the gas meters of different sizes provided with portions corresponding to the respective portions of the respective door gas meters or the respective door gas meters, and a sealing plate which seals the lower end opening of the case main body A device case,
An in-device gas passage formed inside the device case;
Having a built-in component built in the device case,
The built-in component includes an in-device shut-off valve for shutting off the in-device gas passage, an in-device seismic device set to generate a seismic signal due to an earthquake exceeding a predetermined gull value, An in-device control circuit that drives the in-device shut-off valve to shut off the in-device gas passage when a signal is input, and a driving battery power source;
Of the in-device shut-off valve and the in-device control circuit, at least the in-device shut-off valve is a common component with each of the door gas meters or the in-meter shut-off valve of the gas meter.

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