JP7007803B2 - Gas piping system - Google Patents

Description

The present invention is a gas piping system.

In buildings such as houses, various gas appliances using city gas may be installed (see Patent Documents 1 and 2).

Japanese Unexamined Patent Publication No. 2008-209888 Japanese Unexamined Patent Publication No. 2008-128584

In Patent Documents 1 and 2, a shutoff valve that shuts off gas in the event of an abnormality and an ultrasonic sensor that measures the gas flow rate are provided in the gas flow path of the gas meter. Disclosed is a gas appliance monitoring device that shuts off a gas flow path by activating a shutoff valve to determine that it is abnormal when a flow rate value is detected over time.

In the conventional gas piping system, metal piping is used between the gas meter and the gas appliance, and each part such as the piping and the joint is made fire resistant. By the way, when a pipe having a lower fire resistance than the conventional one is used, there is a concern that the pipe may malfunction due to high temperature and gas leakage may occur, and the options for the pipe are limited.

In consideration of the above facts, the present invention provides a gas piping system capable of suppressing gas leakage from piping even when a piping having lower fire resistance than conventional piping, in other words, having lower heat resistance, is used. The purpose is to provide.

The gas piping system according to claim 1 is provided with a gas meter that measures the flow rate of gas supplied from a gas supply source to a gas appliance, and is provided on the downstream side of the gas meter in the gas discharge direction, and flows in through the gas meter. A header that branches and discharges gas at a branch portion, a plurality of pipes that have lower heat resistance than metal pipes and are melted by heat, and that connect the header and the gas appliance, and a plurality of pipes. A shutoff device provided inside the header and on the upstream side of the branch portion and capable of stopping the supply of the gas to the pipe, and the temperature of the environment attached to the pipe and where the pipe is installed. When the temperature of the temperature sensor for measuring and the temperature of the environment measured by the temperature sensor exceeds the set temperature set lower than the melting point of the material having low heat resistance , the shutoff device is activated. A control device for stopping the supply of the gas, a gas meter for measuring the flow rate of the gas supplied from the gas supply source to the gas appliance, and a gas meter provided on the downstream side in the gas discharge direction, and flowing in via the gas meter. A header for branching and discharging the gas at a branch portion, a plurality of pipes connecting the header and the gas appliance, and a header provided on the upstream side of the branch portion with respect to the pipe. A shutoff device capable of stopping the supply of the gas, a temperature sensor for measuring at least the temperature of the environment in which the pipe is installed, and the temperature of the environment measured by the temperature sensor are set preset temperatures. It has a control device for operating the shutoff device and stopping the supply of the gas when the value exceeds the above.

For example, in an environment where pipes are installed, the temperature of the environment may become high due to the occurrence of a fire or the like. When the pipe is exposed to high temperature, there is a concern that the pipe may be defective depending on the material of the pipe and gas leakage may occur.
In the gas piping system according to claim 1, the temperature sensor attached to the piping measures the temperature of the environment in which the piping made of a material that is melted by heat has lower heat resistance than the metal piping. However, when the temperature of the environment measured by the temperature sensor exceeds the set temperature set lower than the preset melting point of the material having low heat resistance , the control device is provided on the upstream side of the branch portion of the header. It is possible to activate the cutoff device to stop the supply of gas to a plurality of pipes.
Therefore, even if a problem occurs in the piping, gas leakage from the piping can be suppressed. Therefore, gas leakage can be suppressed even when a pipe having a lower fire resistance than the conventional one, that is, a pipe having a lower heat resistance is used.

According to the second aspect of the present invention, in the gas piping system according to the first aspect, the gas meter is provided with a gas supply source shutoff device that shuts off the supply of the gas, and the control device is the temperature. When the temperature of the environment measured by the sensor exceeds a preset set temperature, the gas supply source shutoff device is operated to stop the supply of the gas.

In the gas piping system according to claim 2, a temperature sensor measures the temperature of the environment in which the piping is installed, and control is performed when the temperature of the environment measured by the temperature sensor exceeds a preset set temperature. The device can activate the gas source shutoff device of the gas meter to stop the supply of gas to the header.

According to the third aspect of the present invention, in the gas piping system according to the first or second aspect, the set temperature is set lower than the heat resistant temperature of the material constituting the piping.

In the gas piping system according to claim 3, since the set temperature at the time of operating the shutoff device is set lower than the heat resistant temperature of the material constituting the piping, before the piping is exposed to a high temperature and a problem occurs. In addition, the gas supply can be reliably stopped.

According to the fourth aspect of the present invention, in the gas piping system according to the first or second aspect, the set temperature is set lower than the ignition temperature of the gas.

In the gas piping system according to claim 4, since the set temperature is set lower than the ignition temperature of the gas, even if the gas leaks from the piping due to some trouble, the ignition of the gas is suppressed. Can be done.

The invention according to claim 5 is the gas piping system according to any one of claims 1 to 4, wherein a fire alarm is connected to the control device, and the control device is the control device. When it is detected that the fire alarm has been activated, the shutoff device is activated to stop the supply of the gas.

In the gas piping system according to claim 5, a fire alarm is connected, and when the control device detects that the fire alarm has been activated, the shutoff device is activated to stop the gas supply. Therefore, the gas supply can be stopped before the temperature of the installation environment of the pipe becomes high, and the safety can be improved.

According to a sixth aspect of the present invention, in the gas piping system according to the fifth aspect, the fire alarm includes a transmitter that issues an alarm to notify the fire.

The fire alarm can give an alarm such as sound or light to notify the fire. The control device detects that the fire alarm has been activated and activates the shutoff device to stop the gas supply. Therefore, the gas supply can be stopped before the temperature of the installation environment of the pipe becomes high, and the safety can be improved.

The invention according to claim 7 is the gas piping system according to any one of claims 1 to 6, wherein a gas leak alarm is connected to the control device, and the control device is a control device. When it is detected that the gas leak alarm has been activated, the shutoff device is activated to stop the supply of the gas.

In the gas piping system according to claim 7, a gas leak alarm can detect a gas leak. Then, when the control device detects that the gas leak alarm has been activated, the control device activates the shutoff device to stop the gas supply. Therefore, the gas supply can be stopped before the temperature of the installation environment of the pipe becomes high, and the safety can be improved.

As described above, according to the gas piping system of the present invention, even when a piping having a lower fire resistance than the conventional piping is used, it is possible to suppress gas leakage from the piping at high temperature. Has an effect.

It is a schematic block diagram which shows the house to which the gas piping system which concerns on the comparative example 1 was applied. It is a block diagram which shows the control system of the comparative example 1. FIG. It is a flowchart which shows the control of the control device of the comparative example 1. FIG. It is a schematic block diagram which shows the house to which the gas piping system which concerns on the comparative example 2 was applied. It is a block diagram which shows the control system of the comparative example 2. FIG. It is a flowchart which shows the control of the control device of the comparative example 2. FIG. It is sectional drawing which shows the outline of the structure of the header which concerns on embodiment of this invention .

[ Comparative Example 1 ]
Hereinafter, the form of Comparative Example 1 will be described with reference to FIGS. 1 to 3.
As shown in FIG. 1, the gas piping system 10 of this comparative example is applied to a house 12 as an example.

A gas supply pipe 14 for city gas, which is an example of a gas supply source, is arranged outside the house 12. The gas supply pipe 14 of this comparative example is a generally used metal pipe. The end of the gas supply pipe 14 is connected to a gas meter 16 installed outdoors. The gas meter 16 measures a shutoff valve 16A as a gas supply source shutoff device capable of shutting off the gas supply by operating by a control signal from the control device 34 described later, and measures the flow rate of the gas to measure the flow rate to the control device 34 described later. It is provided with a flow meter 16B for outputting data, a display unit 16C for displaying the flow rate of gas, and the like.

A first gas pipe 18 installed indoors is connected to the gas meter 16. The first gas pipe 18 is a commonly used metal pipe. The end of the first gas pipe 18 is connected to a header 20 installed indoors. The header 20 branches the supplied gas into a plurality of parts. The header 20 is installed under the floor 12A of the house 12 as an example, but may be installed indoors in some cases.

As an example, a gas stove 22 and a gas water heater 24 as gas appliances are installed in the house 12.

A first gas pipe 26 connected to the gas stove 22 and a second gas pipe 28 connected to the gas water heater 24 are connected to the header 20.

As shown in FIGS. 1 and 2, the house 12 is provided with a control device 34. Inside the header 20, a shutoff valve 30 capable of shutting off the supply of gas to the first gas pipe 26 and a shutoff valve 32 capable of shutting off the supply of gas to the second gas pipe 28 are provided in parallel. .. The shutoff valve 30 and the shutoff valve 32 can be operated by a control signal from the control device 34 to shut off the supply of gas to the gas pipe side.

Here, in the vicinity of the first gas pipe 26, a first temperature sensor 36 for measuring the temperature of the environment in which the first gas pipe 26 is installed is arranged. The first temperature sensor 36 may be attached to the first gas pipe 26. A plurality of first temperature sensors 36 can be provided along the first gas pipe 26, and as an example, they can be installed in the room 12B and the underfloor 12A. The first temperature sensor 36 is connected to the control device 34 and outputs the measured temperature data to the control device 34.

Similarly, in the vicinity of the second gas pipe 28, a second temperature sensor 38 for measuring the temperature of the environment in which the second gas pipe 28 is installed is arranged. The second temperature sensor 38 may be attached to the second gas pipe 28. A plurality of second temperature sensors 38 can be provided along the second gas pipe 28, and as an example, they can be installed in the room 12C and the underfloor 12A. The second temperature sensor 38 is connected to the control device 34, and outputs the measured temperature data to the control device 34.

In the control device 34, the shutoff valve 16A of the gas meter 16 was activated and closed, the shutoff valve 30 was activated and closed, and the shutoff valve 32 was activated and closed. In this case, a display device 40 indicating that each shutoff valve is activated and the gas supply is stopped is connected. Further, a return button 42 for returning each shutoff valve from the closed state to the open state is connected to the control device 34.

(Action)
Next, the operation of the gas piping system 10 of this comparative example will be described below.
For example, assuming that a fire breaks out in the house 12, the temperature inside the house rises accordingly, and the temperature of the installation environment in which the first gas pipe 26 and the second gas pipe 28 are installed also rises.
FIG. 3 shows a flowchart showing control in which the control device 34 receives the temperature measurement data output from the first temperature sensor 36 and the second temperature sensor 38.

First, in step 100, the temperature T1 of the environment in which the first gas pipe 26 is installed is measured by the first temperature sensor 36, and the temperature T2 of the environment in which the second gas pipe 28 is installed is measured by the second temperature sensor. Measure at 38. The control device 34 constantly measures the temperatures T1 and T2 of the environment.

In the next step 102, it is determined whether or not the temperature T1 of the environment measured by the first temperature sensor 36 exceeds the warning temperature (Tmax ° C.) preset in the control device 34. Here, if the control device 34 determines that the measured environment temperature T1 does not exceed the preset warning temperature (Tmax ° C.), the process proceeds to step 104, and the measured environment temperature T1 is a preset warning. If it is determined that the temperature (Tmax ° C.) has been exceeded, the process proceeds to step 106.

In step 106, the shutoff valve 30 is closed to shut off the supply of gas to the first gas pipe 26. As a result, it is possible to suppress gas leakage from the first gas pipe 26 when the temperature T1 of the environment in which the first gas pipe 26 is installed becomes high. After the shutoff valve 30 is closed, the process proceeds to step 110. After the step 106 is completed, the process may proceed to the step 104.

In the final step 110, the display device 40 indicates that the shutoff valve 30 is in the closed state.

On the other hand, in step 104, it is determined whether or not the temperature T2 of the environment measured by the second temperature sensor 38 exceeds the warning temperature (Tmax ° C.) preset in the control device 34. Here, if the control device 34 determines that the measured environment temperature T2 does not exceed the preset warning temperature (Tmax ° C.), the process returns to step 102, and the measured environment temperature T2 is a preset warning. If it is determined that the temperature (Tmax ° C.) has been exceeded, the process proceeds to step 108.

In step 108, the shutoff valve 32 is closed to shut off the supply of gas to the second gas pipe 28. As a result, it is possible to suppress gas leakage from the second gas pipe 28 when the temperature T2 of the environment in which the second gas pipe 28 is installed becomes high. After the shutoff valve 32 is closed, the process proceeds to step 110.

In the final step 110, the display device 40 indicates that the shutoff valve 32 is in the closed state.

As described above, in the gas piping system 10 of this comparative example , by measuring the temperature of the environment in which the first gas piping 26 is installed and the temperature of the environment in which the second gas piping 28 is installed, for example, for example. The gas supply can be cut off before the first gas pipe 26 and the second gas pipe 28 are exposed to a high temperature and deteriorate (for example, melt, decompose, etc.) to cause a gas leak.

In the gas piping system 10 of this comparative example , gas leakage at high temperature can be suppressed even when a gas piping made of a material having lower fire resistance, in other words, heat resistance than metal piping, is used.

In the gas piping system 10 of this comparative example , when the temperature of the environment measured by the first temperature sensor 36 exceeds the warning temperature (Tmax ° C.), the shutoff valve 30 is closed and the temperature is measured by the second temperature sensor 38. When the temperature of the environment exceeded the warning temperature (Tmax ° C.), the shutoff valve 32 was closed, but the shutoff valve 16A of the gas meter 16 was closed at the same time, and the gas supply was shut off on the upstream side of the header 20. You may. As a result, gas leakage on the downstream side of the gas meter 16 can be suppressed.

The warning temperature (Tmax ° C.) can be arbitrarily set in the control device 34. As an example, the warning temperature (Tmax ° C.) can be set lower than the heat resistant temperature (for example, the melting point) of the materials constituting the first gas pipe 26 and the second gas pipe 28. As a result, the gas supply can be reliably stopped before the first gas pipe 26 and the second gas pipe 28 are exposed to high temperatures and cause a malfunction. Further, the warning temperature (Tmax ° C.) can be set lower than the ignition temperature of the gas.

[ Comparative Example 2 ]
Next, the gas piping system 10 according to Comparative Example 2 will be described with reference to FIGS. 4 to 6. The same components as those in Comparative Example 1 are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIGS. 4 and 5, in the gas piping system 10 of this comparative example , a first gas leak alarm 44 is installed in the vicinity of the gas stove 22, and a second gas is installed in the vicinity of the gas water heater 24. A leak alarm 46 is installed. The first gas leak alarm 44 and the second gas leak alarm 46 are connected to the control device 34, and when a gas leak is detected, a signal for detecting the gas leak is output to the control device 34. ing.

A fire alarm 48 is attached to the ceiling of the room 12B, and a fire alarm 50 is attached to the ceiling of the room 12C. The fire alarms 48 and 50 may be of a smoke sensing type that detects smoke, a heat sensing type that detects a flame, or may be of another type. The fire alarms 48 and 50 are connected to the control device 34, and when a flame (or smoke) is detected, a signal for detecting the flame (or smoke) is output to the control device 34.

Further, in the room of the house 12, a transmitter 52 for sounding an alarm buzzer or turning on an alarm lamp by pressing a button is provided. The transmitter 52 is connected to the control device 34, and by pressing a button, an alarm signal is output to the control device 34. Further, when the button of the transmitter 52 is pressed, an alarm is issued by a bell, a buzzer, a red lamp (not shown), or the like.

In the gas piping system 10 of this comparative example , the first gas leak alarm 44 is installed in the vicinity of the gas stove 22, and the second gas leak alarm 46 is installed in the vicinity of the gas water heater 24. When at least one of the first gas leak alarm 44 and the second gas leak alarm 46 detects a gas leak, the control device 34 closes the shutoff valve 30 and the shutoff valve 32, and the first gas pipe 26 , And cut off the gas supply to the second gas pipe 28.

Further, in the gas piping system 10 of this comparative example, when the fire alarms 48 and 50 detect the occurrence of a fire in the house 12, the control device 34 closes the shutoff valve 30 and the shutoff valve 32, and the first gas pipe is used. The supply of gas to the 26 and the second gas pipe 28 can be cut off.

Further, in the gas piping system 10 of this comparative example , when the button of the transmitter 52 is pressed, the control device 34 closes the shutoff valve 30 and the shutoff valve 32, and the first gas pipe 26 and the second gas pipe are closed. The supply of gas to 28 can be cut off.

As described above, in the gas piping system 10 of this comparative example , in addition to the first temperature sensor 36 and the second temperature sensor 38, the first gas leak alarm 44, the second gas leak alarm 46, and the fire alarm Since the devices 48 and 50 and the transmitter 52 are provided, even if the first temperature sensor 36 and the second temperature sensor 38 are out of order, the first gas pipe 26 and the first gas pipe 26 and the second are in the event of an abnormality in the house 12. 2 The supply of gas to the gas pipe 28 can be cut off, and even before the high temperature of the installation environment of the first gas pipe 26 and the second gas pipe 28 is detected, the first gas pipe 26, And the supply of gas to the second gas pipe 28 can be cut off. This makes it possible to further enhance safety.

The gas leak alarm may be installed under the floor 12A of the house 12. As a result, it is possible to detect gas leakage due to a malfunction of the gas piping system under the floor 12A (loose connection, disconnection of piping, etc.).

The flowchart shown in FIG. 6 shows an example of control of the gas piping system 10 of this comparative example .
First, in step 200, the temperature T1 of the environment in which the first gas pipe 26 is installed is measured by the first temperature sensor 36, and the temperature T2 of the environment in which the second gas pipe 28 is installed is measured by the second temperature sensor. Measure at 38.

In the next step 202, it is determined whether or not the first gas leak alarm 44 and the second gas leak alarm 46 have detected a gas leak. If a gas leak is detected, the process proceeds to step 212, and the shutoff valve 30 and the shutoff valve 32 are closed to shut off the gas supply. On the other hand, if the gas leak is not detected in step 202, the process proceeds to step 204.

In step 204, it is determined whether or not at least one of the fire alarm 48 and the fire alarm 50 has been activated. When at least one of the fire alarm 48 and the fire alarm 50 is activated, the process proceeds to step 212, and the shutoff valve 30 and the shutoff valve 32 are closed to shut off the gas supply. On the other hand, if the fire alarm 48 and the fire alarm 50 are not operating, the process proceeds to step 206.

In step 206, it is determined whether or not the button of the transmitter 52 is pressed. When the button of the transmitter 52 is pressed, the process proceeds to step 212, and the shutoff valve 30 and the shutoff valve 32 are closed to shut off the gas supply. On the other hand, if the button of the transmitter 52 is not pressed, the process proceeds to step 208.

In step 208, it is determined whether or not the temperature T1 of the environment measured by the first temperature sensor 36 exceeds the warning temperature (Tmax ° C.) preset in the control device 34. Here, if the control device 34 determines that the measured environment temperature T1 does not exceed the preset warning temperature (Tmax ° C.), the process proceeds to step 210, and the measured environment temperature T1 is a preset warning. If it is determined that the temperature (Tmax ° C.) has been exceeded, the process proceeds to step 212 to close the shutoff valve 30 and the shutoff valve 32 to shut off the gas supply.

In step 210, it is determined whether or not the temperature T2 of the environment measured by the second temperature sensor 38 exceeds the warning temperature (Tmax ° C.) preset in the control device 34. Here, if the control device 34 determines that the measured environment temperature T2 does not exceed the preset warning temperature (Tmax ° C.), the process returns to step 202, and the measured environment temperature T2 is a preset warning. If it is determined that the temperature (Tmax ° C.) has been exceeded, the process proceeds to step 212 to close the shutoff valve 30 and the shutoff valve 32 to shut off the gas supply.

In the final step 110, the display device 40 indicates that the shutoff valve 32 is in the closed state.

As described above, in the gas piping system 10 of this comparative example , the first gas leak alarm 44, the second gas leak alarm 46, the fire alarm 48, the fire alarm 50, and the transmitter 52 are installed. Therefore, the gas supply can be cut off before the temperature of the environment in which the first gas pipe 26 is installed and the temperature of the environment in which the second gas pipe 28 is installed become high.

(Embodiment)
In the header 20 of the above comparative example , two shutoff valves, a shutoff valve 30 capable of shutting off the supply of gas to the first gas pipe 26 and a shutoff valve 32 capable of shutting off the supply of gas to the second gas pipe 28, are provided. However, as shown in FIG. 7, in the gas piping system 10 of the present embodiment, a shutoff valve 33 connected to the control device 34 is provided on the upstream side of the gas branching portion 20A, and the first gas piping is provided. It is configured to simultaneously shut off the supply of gas to the 26 and the second gas pipe 28.
Although an example of the present invention has been described above, the present invention is not limited to the above, and it is needless to say that the present invention can be variously modified and implemented within a range not deviating from the gist thereof. ..

In the above embodiment, an example in which city gas is used as the gas is shown, but other combustible gas such as propane gas can also be used.

In the above embodiment, an example in which a gas stove 22 and a gas water heater 24 are connected as gas appliances to the header 20 is shown, but the present invention is not limited to this, and the present invention is not limited to this, and the gas stove, gas fan heater, gas dryer, gas oven, and the like. Other gas appliances such as gas generators can also be connected.

Further, a communication device is connected to the control device 34, and the shutoff valve 30 and the shutoff valve 32 are in the closed state in advance to the control device 34 through a communication line (wired or wireless) such as an internet line or a telephone line. You may report to the registered smartphone, mobile phone, personal computer, etc.

10 Gas piping system 14 Gas supply pipe (gas supply source)
16 Gas meter 16A Shutoff valve (Gas supply source shutoff device)
20 Header 22 Gas stove (gas appliance)
24 Gas water heater (gas appliance)
26 1st gas piping (piping)
28 Second gas piping (piping)
36 First temperature sensor (temperature sensor)
38 Second temperature sensor (temperature sensor)
30 Shutoff valve (shutoff device)
32 Shutoff valve (shutoff device)
33 Shutoff valve (shutoff device)
42 Transmitter (fire alarm)
44 1st gas leak alarm 46 2nd gas leak alarm 48 Fire alarm

Claims (7)

A gas meter that measures the flow rate of gas supplied from a gas supply source to a gas appliance,
A header provided on the downstream side in the gas discharge direction of the gas meter, and the gas flowing in through the gas meter is branched into a plurality of parts at a branch portion and discharged.
It is made of a material that has lower heat resistance than metal pipes and is melted by heat, and has a plurality of pipes that connect the header and the gas appliance.
A shutoff device provided inside the header and on the upstream side of the branch portion and capable of stopping the supply of the gas to the pipe.
A temperature sensor attached to the pipe and for measuring the temperature of the environment in which the pipe is installed,
Control to operate the shutoff device to stop the supply of the gas when the temperature of the environment measured by the temperature sensor exceeds a set temperature set lower than the melting point of the material having low heat resistance. With the device,
Has a gas piping system. The gas meter is provided with a gas supply source shutoff device that shuts off the supply of the gas, and the control device is used when the temperature of the environment measured by the temperature sensor exceeds a preset set temperature. The gas piping system according to claim 1, wherein the gas supply source shutoff device is operated to stop the supply of the gas. The gas piping system according to claim 1 or 2, wherein the set temperature is set lower than the heat resistant temperature of the material constituting the piping. The gas piping system according to claim 1 or 2, wherein the set temperature is set lower than the ignition temperature of the gas. A fire alarm is connected to the control device.
The gas according to any one of claims 1 to 4, wherein when the control device detects that the fire alarm has been activated, the shutoff device is activated to stop the supply of the gas. Plumbing system. The gas piping system according to claim 5, wherein the fire alarm is provided with a transmitter that issues an alarm to notify the fire. A gas leak alarm is connected to the control device.
The invention according to any one of claims 1 to 6, wherein the control device activates the shutoff device to stop the supply of the gas when it detects that the gas leak alarm has been activated. Gas piping system.

Images