JP7379397B2 - Purge monitoring device - Google Patents

Description

The present invention relates to a purge monitoring device and a monitoring control device.

Combustible gas (hereinafter sometimes simply referred to as gas) used by consumers is supplied to each consumer via gas piping and gas meters. Furthermore, gas meters are required to be replaced at regular intervals according to the Measurement Act. When a gas meter is replaced, air remains inside the new gas meter. Therefore, after replacing the gas meter, work is performed to purge the air remaining in the gas meter (hereinafter referred to as "purge work").

Conventionally, when performing purging work, the gas outlet of the cheese provided in the gas outlet pipe of the gas meter is opened, gas is supplied to the gas meter from the gas inlet pipe, and the air remaining in the gas meter is released into the atmosphere through the gas outlet. They either dissipated it into the air or burned it on-site. Furthermore, in recent years, a gas recovery container is connected to the gas discharge port of cheese via a conduit, and purged air and gas released during the purging operation are collected into the gas recovery container.

When purging the air remaining in the gas meter, for example, when replacing city gas or LPG gas piping or gas meters, it is necessary to purge the air remaining in the gas piping or gas meter to prevent misfires or extinguishing. Confirm that it has been replaced and the work is complete. This replacement with flammable gas (air purge) was sometimes confirmed using combustion equipment or an oxygen concentration meter, but in recent years, confirmation using a flow-type concentration meter or a suction-type concentration meter has become more common. It has become mainstream.

Note that Patent Document 1, Patent Document 2, and the like have been disclosed as techniques for determining whether purging of air remaining in a gas meter has been completed (air purge completion).

Furthermore, when removing used gas appliances, gas piping, etc., flammable gas remaining in the gas appliances, gas piping, etc. may be replaced with air to ensure work safety.

Even when replacing flammable gas with air, confirmation using a suction-type concentration meter is the mainstream.

Patent Document 3 describes that a plurality of conduits are provided as conduits for connecting an outlet pipe connected to a gas meter and a gas recovery container, each of which has a set opening degree for a flow rate control valve.

Patent Document 4 describes a method for recovering a predetermined gas from a closed space containing the predetermined gas. That is, in Patent Document 4, a reduced pressure container containing an adsorption member that adsorbs a predetermined gas is connected to a closed space via a pressure adjustment means that does not make the closed space a negative pressure, and the predetermined gas is applied to the adsorption material. It is described that the predetermined gas is adsorbed and the predetermined gas adsorbed on the adsorbent material is recovered or processed.

Patent Document 5 discloses a method that does not require a test cheese to be connected in advance in the middle of the outlet pipe, does not require special skill, and does not leave air in the new gas meter or in the outlet pipe. describes a method for replacing an existing gas meter with a new gas meter. That is, Patent Document 5 describes that after a new gas meter is filled with gas and connected to an inlet pipe and an outlet pipe, the opening/closing means is communicated.

Patent Document 6 discloses that when installing a new gas meter, the pressure inside the pipe is measured with the existing gas meter installed, and the degree of gas recovery is measured while recovering the residual gas in the secondary side piping. , describes a gas concentration measuring device that measures the degree of gas replacement while replacing air with gas, and measures the pressure inside a pipe in a state filled with gas.

Japanese Patent Application Publication No. 2001-165730 Japanese Patent Application Publication No. 2004-36937 Patent No. 5295159 Patent No. 3836417 Japanese Patent Application Publication No. 2006-53071 Patent No. 3589192

However, by using a suction-type concentration meter, etc., it is possible to judge the completion of purging the gas in the piping in-line, but the series of gas replacement operations including this judgment of purge completion mainly depends on the skill of the worker. Because the work is left to the discretion of the operator, work efficiency and safety vary depending on the skill of the worker.

It is an object of the present invention to provide a purge monitoring device and a monitoring control device that can systematize a series of work procedures in purge work of gas in piping and establish a work system that does not depend on individual skill.

The purge monitoring device of the present invention provides a purge state when purging gas flowing through a flow path of a main pipe upstream in the gas flow direction from a connection part of a branch pipe branched from the main pipe to the downstream side of the branch pipe. a purge monitoring device that monitors a flow path of the main pipe, the purge determination unit comprising a sensor that detects a specific gas among the gases flowing through the flow path of the main piping, and a purge determination unit that determines that the specific gas has been purged; On the downstream side of the sensor, an on-off valve that opens and closes the flow path of the branch pipe, and control that controls the determination processing by the purge determination unit and the opening and closing of the on-off valve based on a predetermined order upon receiving a purge execution instruction. has a section and a
As the purge mode for the specific gas, a first mode in which the pre-pressurized pressure is returned to the original pressure, and a specific gas that is previously accommodated in the flow path of the main piping at a pressure higher than atmospheric pressure. A second mode in which the pressure is lowered to at least atmospheric pressure is selectable.

According to the present invention, there is a purge determination unit that determines whether a specific gas among the gases flowing through the flow path of the main pipe has been purged, and a flow path of the branch pipe is opened and closed downstream of the purge determination unit. The control section receives a purge execution instruction and controls the determination by the purge determination section and the opening/closing of the on-off valve in chronological order.

As a result, a series of work procedures is systematized, and the skill of each worker is not affected by the purge judgment, so that it is possible to equalize the accuracy of purge judgment control and improve work efficiency.

In addition, as modes for purging the specific gas, there is a first mode in which the pre-pressurized pressure is returned to the original pressure, and a specific gas that is previously accommodated in the flow path of the main piping at a pressure higher than atmospheric pressure. A second mode in which the pressure is lowered to at least atmospheric pressure is selectable.

By lowering the pressure to atmospheric pressure, the specific gas inside the pipe will not be released due to the pressure difference with atmospheric pressure.

In the present invention, the branch pipe is removable from the main pipe, and the branch pipe includes a monitoring pipe that becomes a part of the branch pipe and the control section, and the monitoring pipe is provided with the control unit. The purge determining section and the on-off valve connected to the purge determining section and the on-off valve are housed in a housing.

By accommodating the branch pipe, the monitoring pipe, the control unit, the purge determination unit, and the on-off valve in the casing, equipment can be easily transported, and work such as connecting each part can be omitted, improving work efficiency. will improve.

The present invention is characterized in that a gas recovery container is attached to the most downstream side of the branch pipe in the gas flow direction, and the purged gas is recovered.

Since the purged gas is collected in the gas recovery container, it is not released into the atmosphere.

In the present invention, the invention further includes an airtightness determination section that determines the airtightness of the flow path of the main piping by monitoring the pressure of the flow path of the main piping, and the control section is configured to control the airtightness determination section based on the airtightness determination section. It is characterized by controlling the judgment operation.

By using it together with the airtightness determination by the airtightness determination section, for example, when replacing a gas meter, it is possible to automate a series of determination controls such as pre-replacement pressure determination, post-replacement purge determination, and post-replacement pressure determination. .

In the present invention, the branch pipe is removable from the main pipe, and the branch pipe includes a monitoring pipe that becomes a part of the branch pipe and the control section, and the monitoring pipe is provided with the control unit. The present invention is characterized in that a casing is attached that accommodates the purge determining section, the airtightness determining section, and the on-off valve connected to the purge determining section.

By accommodating the branch pipe, the monitoring piping, the control unit, the purge determining unit, the airtightness determining unit, and the on-off valve in the casing, the equipment can be easily transported and work such as connecting each part can be omitted. , improving work efficiency.

The monitoring and control device of the present invention is a monitoring and control device that is connected to a branch pipe branched from a main pipe when replacing a gas meter that counts the supply amount of combustion gas, and is a monitoring and control device that connects to a branch pipe that branches off from a main pipe, and that controls the flow path of the main pipe. a purge determination unit that includes a sensor that detects flowing air and determines whether the air has passed through the flow path of the branch pipe and is purged; and a purge determination unit that monitors the pressure of the flow path of the branch pipe to an airtightness determination unit that determines the airtightness of the flow path of the branch pipe; an on-off valve that opens and closes the flow path of the branch pipe that is provided downstream of the purge determination unit and the airtightness determination unit; and a purge execution unit. and a control section that controls determination processing by the purge determination section and the airtightness determination section and opening/closing of the on-off valve based on a predetermined order upon receiving an instruction, and the control section controls the process before replacing the gas meter. Then, with the on-off valve closed, the inside of the branch pipe is pressurized, and when the airtightness determining section confirms that the airtightness of the flow path of the main pipe and the branch pipe is maintained, pressurizes the inside of the branch pipe. After replacing the pre-replacement airtightness monitoring control unit that purges the pressure component and the gas meter, the combustion gas is sent from the main pipe to the branch pipe with the on-off valve open, so that the combustion gas in the main pipe is a purge determination control unit that purges the air and closes the on-off valve when the purge determination unit confirms that the air has passed and has been purged; and after replacing the gas meter and by the purge determination control unit. After the purge judgment, the inside of the branch pipe is pressurized with the on-off valve closed, and the airtightness determination section confirms that the airtightness of the flow path of the main pipe and the branch pipe is maintained. , a post-replacement airtightness monitoring control unit that purges the pressurized portion,
The pre-replacement airtightness monitoring control section is characterized in that after purging the pressurized portion, the purging is continued until the pressure is lowered to at least atmospheric pressure.

According to the present invention, the determination work necessary for replacing a gas meter that counts the amount of combustion gas supplied is unified and executed.

That is, before replacing the gas meter, the pre-replacement airtightness monitoring control unit pressurizes the inside of the branch pipe with the on-off valve closed, and the airtightness determination unit checks the airtightness of the main pipe and the flow path of the branch pipe. Once it is confirmed that the pressure is maintained, purge the pressurized portion.

Next, after replacing the gas meter, the purge determination control section purges the air in the main piping by sending combustion gas from the main piping to the branch pipe with the on-off valve open. Once the passage of air is confirmed, close the on-off valve.

Next, in the post-replacement airtightness monitoring means, after the gas meter is replaced and after the purge judgment is made by the purge judgment control unit, the inside of the branch pipe is pressurized with the on-off valve closed, and the airtightness judgment unit pressurizes the inside of the branch pipe. Once it is confirmed that the airtightness of the tube flow path is maintained, the pressurized portion is purged.

As a result, the series of work procedures when replacing a gas meter is systemized, so the skill of each worker is not affected by the purge judgment, so the accuracy of purge judgment control is equalized and the work time is made more efficient. be able to.

Further, in the pre-replacement airtightness monitoring control section, after purging the pressurized portion, the purging is continued until the pressure is lowered to at least atmospheric pressure.

By lowering the pressure to atmospheric pressure, the specific gas inside the pipe will not be released due to the pressure difference with atmospheric pressure.

According to the present invention, it is an object of the present invention to obtain a purge monitoring device and a monitoring control device that can systematize a series of work procedures in purge work of gas in piping and establish a work system that does not depend on individual skills. It has the effect of being.

(A) is a front view showing an example of the configuration of a gas meter according to each embodiment, and (B) is a side view of FIG. 1(A). (A) is a schematic diagram of a gas monitoring unit mainly composed of a monitoring and control device used when replacing a gas meter, and (B) is a block diagram of a control unit installed in the monitoring and control device. FIG. 3 is a functional block diagram for executing gas monitoring work in a control unit of the monitoring and control device according to the first embodiment. 3 is a control flowchart showing a main routine executed by a control unit of the supervisory control device that is activated when the power is turned on. 5 is a control flowchart showing in detail the procedure of (1) pre-exchange pressure determination processing in step 92 of FIG. 4. FIG. 5 is a control flowchart showing in detail the procedure of (2) post-exchange purge determination processing in step 94 of FIG. 4. FIG. 5 is a control flowchart showing in detail the procedure of (3) post-replacement pressure determination process in step 96 of FIG. 4. FIG. Regarding the example (Example 1) of the first embodiment, the display form of the touch panel section 54 when steps 80, 82, and 84 of the flowchart in FIG. 4 (power-on startup main routine) are executed This is an example. Regarding the example (Example 2) of the first embodiment, this is an example of the display form of the touch panel section 54 when steps 88 and 90 of the flowchart of FIG. 4 (power-on startup main routine) are executed. be. This is an example of the display form of the touch panel section 54 when steps 88 and 90 of the flowchart of FIG. be. This is an example of the display form of the touch panel unit 54 when steps 88 and 90 of the flowchart of FIG. be. FIG. 2 is a schematic diagram of a gas monitoring unit mainly including a monitoring and control device according to a second embodiment. Regarding the example (Example 5) of the second embodiment, (A) is a perspective view of a smart gas meter applied as a monitoring and control device, and (B) is a gas gas meter when the smart gas meter is applied as a monitoring and control device. FIG. 2 is a schematic diagram of a monitoring unit. FIG. 7 is a perspective view of a monitor and a start button according to a modified example of the second embodiment, and (A) to (C) are display examples in the case of notification using a 7-segment display provided on the monitor.

"First embodiment"

FIG. 1(A) shows a front view of the gas meter 10 according to the first embodiment, and FIG. 1(B) shows the gas meter 10 shown in FIG. 1(A) on the right side of FIG. 1(A). A side view from above is shown.

As shown in FIGS. 1(A) and 1(B), the gas meter 10 according to the first embodiment has an inlet pipe 12 and an outlet pipe 14 connected to each other, which are provided to rise from the ground or the like at the installation location. There is.

The inlet pipe 12 and the outlet pipe 14 according to the first embodiment are connected to the gas meter 10 via a union nut 12A and a union nut 14A, respectively. Further, the inlet pipe 12 is provided with a meter cock 16, and the outlet pipe 14 is provided with a cheese 18. Further, a plug 18A is screwed and attached to the gas discharge port of the cheese 18.

FIG. 2 shows a monitoring control device 20 used when replacing the gas meter 10.

The monitoring control device 20 according to the first embodiment is connected between the outlet pipe 14 and the gas recovery container 22 when replacing the gas meter 10.

The first adapter 24 is connected to the cheese 18 of the outlet pipe 14 with the plug 18A removed. One end of a hose 26 is connected to the first adapter 24 . Hose 26 functions as a branch pipe of the present invention. The hose 26 is preferably made of rubber, synthetic resin, or the like and is flexible and bendable.

A second adapter 28 is attached to the other end of the hose 26. The second adapter 28 is connected to an on-off valve 22A provided in the gas recovery container 22.

A monitoring control device 20 is interposed at an intermediate position of this hose 26.

A pressurizing device 30 is connected to the hose 26 on the upstream side of the monitoring and control device 20 via a branch pipe 32, and the pressure inside the hose 26 can be adjusted by the pressurizing operation by the pressurizing device 30. It looks like this.

In the first embodiment, the pressurizing device 30 uses a rubber bulb that is manually pressurized, but it may be configured to pressurize using the driving force of a pump.

Further, a needle valve 34 is connected to the hose 26 on the downstream side of the monitoring and control device 20.

The opening degree of the needle valve 34 is adjusted by turning a handle 34A. Note that the needle valve may be selectively attached from among a plurality of needle valves each having a fixed opening degree.

Here, in the first embodiment, the hose 26 has a first adapter 24 and a second adapter 28 connected to both ends thereof, and a hose 26 that is attached between the first adapter 24 and the second adapter 28. , various devices (pressurizing device 30, monitoring control device 20, needle valve 34, etc.) are collectively referred to as a gas monitoring unit 36. The gas monitoring unit 36 has a transportable structure.

In other words, normally, the plug 18A (see FIG. 1) is attached to the cheese 18 of the outlet pipe 14, but when replacing the gas meter 10, the plug 18A is removed and the worker replaces the gas monitoring unit. 36, connect the first adapter 24 to the cheese 18, and connect the second adapter 28 to the gas recovery container 22, which was brought separately, to complete the replacement work system. Note that the gas recovery container 22 may be part of the gas monitoring unit 36.

Furthermore, although the cheese 18 of the first embodiment has the branch side opening closed by the plug 18A, for example, it has an automatic closing valve function, and although the branch side opening is normally closed, the first adapter 24 The structure may be such that the connection is automatically opened when the connection is made.

As shown in FIG. 2(A), the monitoring control device 20 is covered with a housing 21, and is provided with a monitoring pipe 38 communicating with the hose 26. Further, the housing 21 houses a control unit 40 that controls gas monitoring work (details will be described later) that is performed when the gas meter 10 is replaced.

A pressure sensor 48, a concentration sensor 50, and an on-off valve 52 are attached to the monitoring pipe 38. The concentration sensor 50 includes, for example, a transmitter 50A that transmits ultrasonic waves and a receiver 50B that receives the ultrasonic waves. Note that the concentration sensor 50 may have a structure in which the transmitting section 50A and the receiving section 50B are housed in one housing by utilizing reflection from the inner circumferential surface of the conduit.

As shown in FIG. 2(B), the control section 40 includes a microcomputer 42. The microcomputer 42 has a CPU 42A, a RAM 42B, a ROM 42C, an input/output port (I/O) 42D, and a bus 42E such as a data bus or a control bus that connects these.

A hard disk 44 as a large-scale storage device is connected to the I/O 42D.

Work information is input into the hard disk 44 before the monitoring work is performed. Work information includes customer identification information (customer ID), worker identification information (worker ID), current location information, and existing and new gas meter numbers. These work information is stored and compiled into a database.

A communication I/F 46 is connected to the I/O 42D of the control unit 40 in the first embodiment, and work information, etc. is transmitted not only through the hard disk 44 but also through a communication terminal device individually owned by the worker. The information may be sent to a management server (not shown) connected to a network to collectively manage information regarding monitoring work performed in various locations.

As shown in FIG. 2(B), a pressure sensor 48 and a concentration sensor 50 are connected to the I/O 42D as detection devices. Further, an on-off valve 52 is connected to the I/O 42D as an operating device. More specifically, the on-off valve 52 includes an actuator such as a solenoid or a motor, and a valve body, and the control unit 40 controls the operation of the actuator to open and close the valve body.

The pressure sensor 48 detects the pressure of gas (combustion gas or air) flowing inside the monitoring pipe 38. The pressure sensor 48 sends a detected signal to the control unit 40.

Further, the concentration sensor 50 detects the oxygen concentration of the gas (combustion gas or air) flowing inside the monitoring pipe 38. The concentration sensor 50 has at least a signal level clearly different when detecting combustion gas and a signal level when detecting air (for example, a binary signal of an L signal and an H signal). This signal is sent to the control section 40. Note that the sensor is not limited to the concentration sensor 50 and may be any other sensor as long as it is possible to distinguish between combustion gas and air.

Further, a touch panel section 54 and a start button 56 are connected to the I/O 42D of the control section 40.

As an output system, the touch panel section 54 displays the type of gas monitoring work to be performed when replacing the gas meter 10, as well as instructions for each work, progress status, and selection items for which the operator is to select. Display is executed.

Further, the touch panel section 54 serves as an input system for performing selection operations on selection items displayed regarding gas monitoring work.

When the type of gas monitoring work to be performed when replacing the gas meter 10 is selected, the start button 56 instructs execution of the work. In addition, in the first embodiment, the start button 56 has a so-called mechanical structure, but it may also be a touch operation on the touch panel section 54.

The aforementioned gas monitoring work performed when replacing the gas meter 10 can be roughly divided into the following three types.

(1) Pre-replacement pressure determination process

(2) Post-replacement purge judgment process

(3) Post-replacement pressure determination process

The control unit 40 of the first embodiment stores in advance a control program for executing the gas monitoring tasks (1) to (3), and executes monitoring control based on the specified gas monitoring task. be done.

(1) Pre-replacement pressure determination process

The pre-replacement pressure determination is performed by performing an airtightness test to determine whether or not the airtightness in the piping is maintained in the current state, that is, in the state in which the gas meter 10 before replacement is installed, at a predetermined pressure (for example, 3 kPa). ) for a certain period of time (for example, 2 minutes) to monitor the pressure state.

The work process is sequentially displayed on the touch panel unit 54, so that the worker can recognize the progress of the work. Note that the progress of the work may be sequentially stored in the hard disk 44 together with work information compiled into a database.

(2) Post-replacement purge judgment process

The post-replacement purge determination is a purge process that determines that the purge has been completed when expelling (purging) the air filling the internal piping of the new gas meter 10 into the gas recovery container 22 when replacing the gas meter 10. This is a judgment work.

Specifically, immediately after replacement, the hose 26 is filled with combustion gas and the internal piping of the new gas meter 10 is filled with air, and when the meter cock 16 (see Fig. 1) is opened, the pressure inside the piping is reduced. Gas passes through the monitoring pipe 38 in the order of combustion gas → air → combustion gas.

At this time, purge is determined by detecting when the gas in the monitoring pipe 38 changes from air to combustion gas using the concentration sensor 50.

(3) Post-replacement pressure determination process

Post- replacement pressure determination is performed by performing an airtightness test to determine whether or not the airtightness within the piping is maintained in the current state, that is, with the replaced gas meter 10 installed, at a predetermined pressure (for example, 3 kPa). ) for a certain period of time (for example, 5 minutes) to monitor the pressure state.

The work process is sequentially displayed on the touch panel unit 54, so that the worker can recognize the progress of the work. The progress of the work is recorded on the hard disk along with work information input in advance (customer identification information (customer ID), worker identification information (worker ID), current location information, existing and new gas meter numbers, etc.). 44 or a server on a network.

FIG. 3 is a functional block diagram for executing gas monitoring work in the control unit 40 of the monitoring and control device 20 according to the first embodiment. Each block in FIG. 3 is a visualization and classification of the execution procedure of the control program for each gas monitoring work executed by the CPU 42A by function, and does not limit the hardware configuration of the control unit 40.

The control unit 40 includes a startup determination unit 60, which determines startup when a power operation unit (not shown) of the monitoring and control device 20 is turned on, and instructs the work information reception unit 62 and work guidance control unit 64 to start. do.

The work information reception unit 62 automatically or manually receives work information. The work information includes customer identification information (customer ID), worker identification information (worker ID), current location information, and existing and new gas meter numbers. etc., and in the case of a new model (such as a smart gas meter), it is possible to automatically acquire some or all of the work information registered in the smart gas meter by wire or wirelessly.

Further, in the case of an old model gas meter, the worker inputs work information using an input device (touch panel section 54, external keyboard, etc.).

The work information reception section 62 is connected to the work guide control section 64 and the work information storage section 66.

The work information reception unit 62 sends confirmation information to the work guide control unit 64 to confirm that the work information has been received, and also sends the received work information to the work information storage unit 66.

The work information storage unit 66 stores work information on the hard disk 44 . The work information stored in the hard disk 44 can be sent to a mobile terminal owned by the worker or to a server on the network.

When the work guidance control unit 64 receives the activation instruction from the activation determination unit 60 and confirms acceptance of the work information, it controls the touch panel unit 54 to display a gas monitoring work content menu.

The gas monitoring work content menu has a display format that allows the operator to select (1) pre-replacement pressure determination, (2) post-replacement purge determination, or (3) post-replacement pressure determination, and when the operator selects one of them, The selection information is sent to the selection information receiving section 68.

Note that if there is only one gas monitoring work menu (for example, purge determination after replacement), it is not necessary to display this selection menu.

The selection information reception unit 68 is connected to the work content instruction unit 70 and the start button 56, and after receiving selection information from the touch panel unit 54, when the start button 56 is operated (work execution instruction), the selection information reception unit 68 executes the received work. The content information is output to the work content instruction section 70.

That is, when the work content is (1) pre-replacement pressure determination or (3) post-replacement pressure determination, the work content instruction unit 70 instructs the pressure determination execution control unit 72 to execute.

On the other hand, if the work content is (2) post-replacement purge determination, the work content instruction unit 70 instructs the purge determination execution control unit 74 to execute.

A timer 75, a pressure sensor 48, an on-off valve operation control section 77, and a touch panel section 54 are connected to the pressure determination execution control section 72, and processes are executed according to a predetermined pressure determination control program.

Further, the concentration sensor 50, the on-off valve operation control section 77, and the touch panel section 54 are connected to the purge judgment execution control section 74, and processes are executed according to a predetermined purge judgment control program.

The operation of the first embodiment will be explained below.

First, an overview of the gas meter replacement work procedure will be explained.

In step 1, the plug 18A attached to the cheese 18 of the outlet pipe 14 of the gas meter 10 is removed, and the first adapter 24 of the gas monitoring unit 36 is connected. Also, a second adapter 28 is connected to the gas recovery container 22 . At this time, the hose 26 is filled with combustion gas.

In step 2, a pressure determination (airtightness test) is performed on the gas meter 10 (old meter) before replacement ((1) Execution of pre-replacement pressure determination).

In step 3, if the result of the pre-replacement pressure determination (airtightness test) is OK, the pressurized portion is degassed, and the pre-replacement pressure determination is completed.

In step 4, the old gas meter 10 is replaced with a new meter. Note that after removing the old meter, it is desirable to immediately close the opening of the pipe with a cap.

In step 5, since the replaced gas meter 10 (new meter) is filled with air, purging is performed ((2) Execution of post-replacement purge determination).

In step 6, a pressure determination (airtightness test) is performed on the replaced gas meter 10 (new meter) ((3) Execution of post-replacement pressure determination).

In step 7, if the result of the post-exchange pressure determination (airtightness test) is OK, the pressurized portion is degassed, and the post-exchange pressure determination ends.

In step 8, the gas monitoring unit 36 is removed from the cheese 18, the plug 18A is attached, and the work is completed.

4 to 7 are control flowcharts showing details of the gas meter replacement work procedure.

FIG. 4 is a control flowchart showing a main routine executed by the control unit 40 of the supervisory control device 20 that starts when the power is turned on.

In step 78, it is determined whether or not it has started normally, and if the determination is negative, it is determined that there is an abnormality in the monitoring and control device 20, and the process proceeds to step 79, where failure processing is executed. finish.

Further, if an affirmative determination is made in step 78, it is determined that the monitoring and control device 20 is normal, and the process proceeds to step 80.

In step 80, it is determined whether input of work information is automatic or manual. If it is determined in step 80 that the input of work information is automatic, the process moves to step 82 and automatic input processing is executed. The automatic input process mainly consists of establishing communication between the information sending and receiving sides and automatically capturing work information after communication is established. If the work information has been automatically input, the process moves to step 86. Note that if some work information cannot be automatically input, the process may proceed to manual input processing in step 84.

On the other hand, if it is determined in step 80 that the input of work information is manual, the process moves to step 84 and manual input processing is executed. The manual input process mainly consists of collecting information and inputting information by key operations, etc. If work information is manually input, the process moves to step 86.

In step 86, the input work information is stored in the hard disk 44, and the process moves to step 88.

In step 88, it is determined whether or not the work content has been specified. If the determination is negative, the process moves to step 98. On the other hand, if an affirmative determination is made in step 88, the process moves to step 90, and the specified work content is determined.

That is, if (1) pre-replacement pressure determination processing is specified in step 90, the process moves to step 92, executes (1) pre-replacement pressure determination processing (described in detail in FIG. 5), and then proceeds to step 98. Move to.

If (2) post-replacement purge determination processing is specified in step 90, the process moves to step 94, executes (2) post-replacement purge determination processing (described in detail in FIG. 6), and then step 98 Move to.

Furthermore, if (3) post-replacement pressure determination processing is specified in step 90, the process proceeds to step 96, where the (3) post-replacement pressure determination processing is executed (detailed explanation in FIG. 7), and step 98. Move to.

In step 98, it is determined whether or not there has been an instruction to end the work, and if the determination is negative, the process returns to step 88. Further, if an affirmative determination is made in step 98, the power to the supervisory control device 20 is turned off, and this routine ends.

Note that when specifying the work details, an instruction menu may be provided to sequentially execute (1) pre-replacement pressure determination processing, (2) post-replacement purge determination processing, and (3) post-replacement pressure determination processing. In this case, the work can be executed in the order of step 92 → step 94 → step 96 without specifying the work content or operating the start button 56 or the like each time.

(1) Pre-replacement pressure determination process

FIG. 5 is a control flowchart showing in detail the procedure of (1) pre-replacement pressure determination process in step 92 of FIG.

In step 100, it is determined whether or not the start button 56 has been pressed. If the determination is negative, the process moves to step 102, and it is determined whether or not there has been a cancellation instruction.

If an affirmative determination is made in step 102, it is determined that (1) the execution of the pre-replacement pressure determination process has been canceled, and this routine ends, and the process moves to step 98 in FIG. 4.

If a negative determination is made in step 102, the process returns to step 100, and steps 100 and 102 are repeated until an affirmative determination is made in step 100 or step 102.

Here, if an affirmative determination is made in step 100, (1) execution of the pre-replacement pressure determination process is started, and the process first moves to step 104 to close the on-off valve 52, and then moves to step 106. , instructs the pressurizing device 30 (rubber ball) to pressurize, and proceeds to step 108.

In step 108, pressure measurement by the pressure sensor 48 is started, and the process moves to step 110.

In step 110, it is determined whether a reference value (here, 3 kPa) for pre-exchange pressure determination has been reached. If a negative determination is made in step 110, the process proceeds to step 112, where it is determined whether a predetermined period of time has elapsed. If a negative determination is made in step 112, the process returns to step 110. In addition, if an affirmative determination is made in step 112, it is determined that the pressure inside the hose 26 does not reach the reference pressure for some reason, and the process proceeds to step 114, in which the pressure by the pressure device 30 (rubber bulb) is terminated. Then, the process moves to step 122.

In step 122, the pressure measurement is finished, and the on-off valve 52 is opened. Next, the process proceeds to step 124, where it is notified that the airtightness test result is abnormal, and this routine ends, and the step shown in FIG. Return to 98.

On the other hand, if an affirmative determination is made in step 110, it is determined that the pressure inside the hose 26 has reached the reference pressure, and the process proceeds to step 116, instructing the end of pressurization by the pressurizing device 30 (rubber bulb), and step 118. Move to.

In step 118, it is determined whether a predetermined time (here, 2 minutes) has elapsed, and if the determination is negative, the process moves to step 120, and it is determined whether or not there is a pressure abnormality (decrease). If a negative determination is made in step 120, the process returns to step 118. Further, if an affirmative determination is made in step 120, it is determined that the pressure within the hose 26 has decreased for some reason, and the process proceeds to step 122.

In step 122, the pressure measurement is finished, and the on-off valve 52 is maintained in the closed state.Then, the process proceeds to step 124, where it is notified that the airtightness test result is abnormal, and this routine is finished. Return to step 98 of 4. In addition, since the airtightness test result was abnormal, the on-off valve 52 was maintained in the open and closed state with the premise of maintaining the status quo, but after opening the on-off valve 52 and returning the inside of the pipe to atmospheric pressure, The valve 52 may be closed.

Further, if an affirmative determination is made in step 118, that is, it is determined that the pressure within the hose 26 has not decreased and a predetermined time (here, 2 minutes) has elapsed, the process proceeds to step 126, and the on-off valve 52 is opened. Then, the process moves to step 128, where it is notified that the airtightness test result is normal, and the process moves to step 130.

In step 130, it is determined whether the pressure within the pipeline has reached atmospheric pressure. If an affirmative determination is made in this step 130, the process moves to step 132, where the pressure measurement is finished and the on-off valve 52 is closed, and this routine is finished and the process returns to step 98 in FIG. 4. By setting the inside of the pipe to atmospheric pressure, when the gas meter 10 is removed, the gas in the pipe through which gas normally flows is maintained within the pipe, for example, by closing the end opening of the pipe with a cap. This makes it possible to suppress gas leakage.

Note that the gas in the pipe may be completely removed. As an example, since the gas recovery container 22 is in a vacuum state, by continuing to open the on-off valve 52, the gas is drawn into the gas recovery container 22. By closing the on-off valve 52 when the concentration sensor 50 no longer detects gas, no gas is present in the pipe. After that, by removing the gas meter 10, air will flow into the vacuum pipe line, and gas leakage can be prevented.

(2) Post-replacement purge judgment process

FIG. 6 is a control flowchart showing in detail the procedure of (2) post-exchange purge determination processing in step 94 of FIG.

In step 200, it is determined whether or not the start button 56 has been pressed. If the determination is negative, the process moves to step 202, and it is determined whether or not there has been a cancellation instruction.

If an affirmative determination is made in step 202, it is determined that the execution of (2) post-replacement purge determination control has been canceled, and this routine ends, and the process moves to step 98 in FIG.

Further, if a negative determination is made in step 202, the process returns to step 200, and steps 200 and 202 are repeated until an affirmative determination is made in step 200 or step 202.

Here, if an affirmative determination is made in step 200, execution of (2) post-replacement purge determination control is started, and the process first proceeds to step 204, instructs to open the meter cock 16, and proceeds to step 206. Currently, the meter cock 16 is opened manually by an operator, but it may be opened (and closed) automatically using a driving means such as a solenoid valve or a motor.

After opening the meter cock 16 (for example, you may wait for manual operation using a timer or the like, or confirm that it has been opened by operating the touch panel section 54), in step 206, open the on-off valve 52, Next, the process proceeds to step 208, where the concentration sensor 50 starts measuring the oxygen concentration, and the process proceeds to step 210.

In step 210, it is determined whether air (oxygen) is detected. If a negative determination is made in step 210, the process proceeds to step 212, where it is determined whether a predetermined period of time has elapsed. If a negative determination is made in step 212, the process returns to step 210. In addition, if an affirmative determination is made in step 212, it is determined that the air cannot escape from the hose 26 for some reason, and the process proceeds to step 218, where an instruction is given to close the meter cock 16, and the meter cock 16 is closed. After confirmation, the process moves to step 220, the on-off valve 52 is closed, and the process moves to step 222. In step 222, it is reported that the purge determination is abnormal, and this routine ends and returns to step 98 in FIG. 4.

On the other hand, if an affirmative determination is made in step 210, it is determined that the air region within the hose 26 is passing through, and the process proceeds to step 214, where the combustion that exists after (downstream) the air region within the hose 26 is determined. Determine whether gas is detected.

If a negative determination is made in step 214, the process proceeds to step 216, where it is determined whether a predetermined period of time has elapsed. If a negative determination is made in step 216, the process returns to step 214. Further, if an affirmative determination is made in step 216, it is determined that combustion gas does not reach the hose 26 for some reason, and the process proceeds to step 218, where an instruction is given to close the meter cock 16, and the meter cock 16 is closed. After confirming, the process moves to step 220, the on-off valve 52 is closed, and the process moves to step 222. In step 222, it is reported that the purge determination is abnormal, and this routine ends and returns to step 98 in FIG. 4.

Further, if an affirmative determination is made in step 214, it is determined that the inside of the hose 26 is filled with combustion gas (that is, the inside of the inlet pipe 12, the replaced gas meter 10, and the outlet pipe 14 are filled with combustion gas). Then, the process moves to step 224, where the meter cock 16 is instructed to close, and after confirming that the meter cock 16 is closed, the process moves to step 226, where the on-off valve 52 is closed, and the process moves to step 228. In step 228, it is notified that the purge determination has been completed normally, and this routine ends and returns to step 98 in FIG. 4.

(3) Post-replacement pressure determination process

FIG. 7 is a control flowchart showing in detail the procedure of (3) post-replacement pressure determination process in step 96 of FIG.

In step 300, it is determined whether or not the start button 56 has been pressed. If the determination is negative, the process moves to step 302, and it is determined whether or not there has been a cancellation instruction.

If an affirmative determination is made in step 302, it is determined that the execution of (3) post-replacement pressure determination control has been canceled, this routine ends, and the process moves to step 98 in FIG. 4.

Further, if a negative determination is made in step 302, the process returns to step 300, and steps 300 and 302 are repeated until a positive determination is made in step 300 or step 302.

Here, if an affirmative determination is made in step 300, execution of (3) post-replacement pressure determination control is started, and the process first moves to step 304 to close the on-off valve 52, and then moves to step 306. , instructs the pressurizing device 30 (rubber ball) to pressurize, and proceeds to step 308.

In step 308, pressure measurement by the pressure sensor 48 is started, and the process moves to step 310.

In step 310, it is determined whether the reference value (here, 3 kPa) for post-exchange pressure determination has been reached. If a negative determination is made in step 310, the process proceeds to step 312, where it is determined whether a predetermined period of time has elapsed. If a negative determination is made in step 312, the process returns to step 310. In addition, if an affirmative determination is made in step 312, it is determined that the pressure inside the hose 26 does not reach the reference pressure for some reason, and the process proceeds to step 314, in which the pressure by the pressure device 30 (rubber bulb) is terminated. and moves to step 322.

In step 322, the pressure measurement is completed and the on-off valve 52 is opened. Next, the process proceeds to step 324, where it is notified that the airtightness test result is abnormal, and this routine is completed, and the step shown in FIG. Return to 98.

On the other hand, if an affirmative determination is made in step 310, it is determined that the pressure inside the hose 26 has reached the standard pressure, and the process proceeds to step 316, instructing the end of pressurization by the pressurizing device 30 (rubber bulb), and step 318. Move to.

In step 318, it is determined whether a predetermined period of time (here, 5 minutes) has elapsed, and if the determination is negative, the process moves to step 320, and it is determined whether or not there is an abnormality (decrease) in pressure. If a negative determination is made in step 320, the process returns to step 318. Further, if an affirmative determination is made in step 320, it is determined that the pressure within the hose 26 has decreased for some reason, and the process proceeds to step 322.

In step 322, the pressure measurement is completed and the on-off valve 52 is opened. Next, the process proceeds to step 324, where it is notified that the airtightness test result is abnormal, and this routine is completed, and the step shown in FIG. Return to 98.

Further, if an affirmative determination is made in step 318, that is, it is determined that the pressure within the hose 26 has not decreased and a predetermined time (here, 5 minutes) has elapsed, the process moves to step 326 and the pressure measurement is completed. At the same time, the on-off valve 52 is opened, and then the process moves to step 328 to notify that the airtight test result is normal, and this routine ends and returns to step 98 in FIG. 4.

"Example of the first embodiment (Example 1 to Example 3)"

In the following, the touch panel section will be described in conjunction with the execution of the operations ((1) pre-replacement pressure determination, (2) post-replacement purge determination, and (3) post-replacement pressure determination) in the monitoring and control device 20 of the first embodiment. 54 shows an example of the notification format displayed in FIG.

(Example 1)

FIG. 8 is an example of the display form of the touch panel unit 54 when steps 80, 82, and 84 of the flowchart (power-on startup main routine) of FIG. 4 are executed.

In response to the process of step 80 in FIG. 4, a work information input screen 54A shown in FIG. 8(A) is displayed on the touch panel section 54.

When the worker selects and decides on manual, the manual input screen 54B (before input) of work information is displayed as shown in FIGS. ), 54C (input) is displayed.

On the other hand, when the operator selects and decides on automatic, the communication establishment screen 54D and automatic input screen 54E are displayed as shown in FIGS. 8(C) to 8(D) according to the process of step 82 in FIG. is displayed.

(Example 2)

FIG. 9 is an example of the display form of the touch panel unit 54 when steps 88 and 90 of the flowchart (power-on startup main routine) of FIG. 4 are executed.

In response to the process of step 88 in FIG. 4, the touch panel unit 54 displays a work content selection screen 54F shown in FIG. 9(A) (before selection, the same as the work content selection screen 54F in FIG. 8(A)). be done.

When the operator selects and decides on (1) pre-replacement pressure determination, the work status notification is performed as shown in FIG. 9(B) in accordance with the process of step 92 in FIG. 4 (see FIG. 5 for details). Screen 54G is displayed.

As an example, the display order is as follows.
(1) Close the on-off valve.
(2) Start applying pressure using a rubber ball.
(3) Stop pressurizing (3kPa).
(4) Pressure measurement... (judgment of pressure fluctuation in 2-branch tube)
(5-1) Pressure is normal.
(5-2) The pressure is abnormal. Please run the troubleshooter.
(6) Open the on-off valve and return the pressure to normal.

(Example 3)

FIG. 10 is an example of the display form of the touch panel section 54 when steps 88 and 90 of the flowchart (power-on startup main routine) of FIG. 4 are executed.

In response to the process in step 88 in FIG. 4, the touch panel unit 54 displays a work content selection screen 54F shown in FIG. 10(A) (before selection, the same as the work content selection screen 54F in FIG. 8(A)). be done.

When the operator selects and decides on (2) post-replacement purge determination, the work status notification is performed as shown in FIG. 10(B) in accordance with the process of step 94 in FIG. Screen 54H is displayed.

As an example, the display order is as follows.

(1) Open the meter cock.
(2) The on-off valve was opened.
(3) Measuring concentration... (combustion gas → air → combustion gas)
(4-1) Purge completed successfully.
(4-2) Purge failed. Please run the troubleshooter.
(5) The on-off valve was closed.

(Example 4)

FIG. 11 is an example of the display form of the touch panel section 54 when steps 88 and 90 of the flowchart (power-on startup main routine) of FIG. 4 are executed.

In response to the process of step 88 in FIG. 4, a work content selection screen 54F shown in FIG. 11(A) is displayed on the touch panel section 54.

When the operator selects (3) Post-replacement pressure determination and decides, the work status notification is performed as shown in FIG. 11(B) in accordance with the process of step 96 in FIG. 4 (see FIG. 7 for details). Screen 54I is displayed.

As an example, the display order is as follows.

(1) Close the on-off valve.
(2) Start applying pressure using a rubber ball.
(3) Stop pressurizing (3kPa).
(4) Pressure measurement... (judgment of pressure fluctuation in 2-branch tube)
(5-1) Pressure is normal.
(5-2) The pressure is abnormal. Please run the troubleshooter.
(6) Open the on-off valve and return the pressure to normal.

As described above, in the first embodiment, the monitoring and control device 2 The main unit is the gas monitoring unit 36, which can be carried by a worker and attached to and detached from the outlet pipe 14 of the gas meter 10.In particular, a series of work procedures for purging gas in the pipes has been systematized, making it easy for individuals to carry the gas monitoring unit 36. It is possible to establish a business system that does not depend on the skill of the person. Further, since the work is executed according to the control program, progress information of the work on the timeline can be recorded sequentially.

"Second embodiment"

A second embodiment of the present invention will be described below. Note that in the second embodiment, the same components as those in the first embodiment are given the same reference numerals, and the explanation of the structure will be omitted.

The feature of the second embodiment is that the supervisory control device 20A is configured specifically for purge determination.

FIG. 12 is a schematic configuration diagram of a supervisory control device 20A according to the second embodiment of the present invention.

As shown in FIG. 12, a pressure determination control device 30A is connected to the upstream side of the monitoring control device 20 as a pressurizing device 30.

The control unit (not shown) of the pressure determination control device 30A stores in advance the (1) pre-replacement pressure determination control program and (3) post-replacement pressure determination control program shown in the first embodiment. There is.

Further, a rubber bulb 30B is attached to the pressure determination control device 30A, and a pressure sensor 48 provided in the monitoring control device 20A is connected.

Thereby, the pressure determination control device 30A performs pressure determination before and after replacing the gas meter 10, separately from the monitoring control device 20A.

According to the second embodiment, by specializing the processing executed in the monitoring and control device 20 for purge determination control, events that are required of the operator, such as selection of work contents and instructions for applying pressure using a rubber ball, are reduced. , simply operating the start button improves the efficiency of the important work of purge determination.

In addition, the guidance information only requires the opening/closing instruction of the meter cock, and the display device can be configured to be simple and inexpensive, such as a 7-segment display, since normal or abnormal conditions can be indicated by lighting a lamp or the like. .
Note that in the first embodiment and the second embodiment, each monitoring function of (1) pre-replacement pressure determination process, (2) post-replacement purge determination process, and (3) post-replacement pressure determination process is , is executed by the supervisory control device 20.
On the other hand, in the second embodiment, a pressure determination control device 30A is provided as the pressurization device 30, and the pressure determination control device 30A is also provided with a control device including a microcomputer similarly to the monitoring control device 20. ing.
Therefore, the monitoring control device 20A may simply be a purge determining device, and the pressure determining control device 30A may be provided with a monitoring control function.
In this case, the pressure determination control device 30A needs to acquire signals for monitoring, such as the work status regarding the purge determination process, from the control unit 40 of the purge determination device (monitoring control device 20A).

“Example of the second embodiment (Example 4)”

Note that a smart gas meter 20S may be applied to the monitoring and control device 20A in the second embodiment, as shown in FIGS. 13(A) and 13(B).

That is, in the smart gas meter 20S, the internal pipe line (from the union nut 12A on the inlet pipe side to the union nut 14A on the outlet pipe side) can be applied as the monitoring pipe 38, and the union nuts 12A and 14A are connected to the hose 26. has been done.

Further, a concentration sensor 50 and an on-off valve 52 are installed in advance in the internal pipe line of the smart gas meter 20S.

Therefore, by storing (2) the purge determination control program in the control unit of the smart gas meter 20S, as shown in FIG. 13(B), the monitoring and control device 20A of the second embodiment (see FIG. ) can function as

Note that the start button 56 shown in FIG. 12 can be used as a return button (indicated by reference numeral 56 in FIG. 13) for returning the smart gas meter 20S when the flow path is closed due to an earthquake or the like. be.
Further, in the supervisory control device 20 of the first embodiment, the touch panel unit 54 is applied as a display device provided in the supervisory control device 20, but in the supervisory control device 20A of the second embodiment, the When the smart gas meter 20S is applied in this way, it becomes a simple output-only display device (monitor 54M shown in FIG. 14) with a 7-segment display.
In this case, instead of detailed guidance notifications (for example, the guidance notifications shown in FIGS. 8 to 11 in the first embodiment), as shown in FIG. 14, the monitor 54M and the start button (return button) 56 The work status may be notified.
FIG. 4A shows an example in which "PuSH" (push) is displayed on the monitor 54M in a 7-segment display to instruct the user to press the start button (return button) 56 to start work.
FIG. 4B shows an example in which "ProK" (pressure OK) is displayed on the monitor 54M in a 7-segment display to notify that the pressure determination process was successful. If it is defective, "PrnG" (pressure NG) is displayed.
FIG. 4C shows an example in which "PunG" (purge NG) is displayed on the monitor 54M in a 7-segment display to notify that the purge determination process was defective (abnormal). If the condition is good, "PuoK" (purge OK) is displayed.
Note that the display contents are not limited to those shown in FIGS. 4(A) to 4(C) above. For example, in the first embodiment and the second embodiment (both including examples), (1) pre-exchange pressure determination process, (2) post-exchange purge determination process, and (3) post-exchange pressure Only the pass/fail (OK/NG) of each process result of the determination process may be displayed.
Furthermore, in the second embodiment, since the supervisory control device 20A (20S) only performs (2) post-replacement purge determination, when determining "good", for example, the monitor control device 20A (20S) lights up a green lamp provided on the monitor 54M. It may be a simple notification.

In addition, in the first embodiment and the second embodiment (including each example), a purge monitoring device used for purge determination when replacing a gas meter has been described, but the purge monitoring device according to the present invention This is not limited to gas meter replacement work, but when replacing a part of a conduit that guides a specific gas (piping buried in a road, etc.), a main body is installed at the downstream end of the replacement area in the gas flow direction. By attaching and replacing the purge monitoring device of the present invention, it can be applied to purge judgment when purging a foreign gas (for example, air) mixed in a specific gas (for example, combustion gas).

More specifically, before cutting both ends of the piping section to be replaced, rubber balls or the like are inflated at both ends of the piping section to isolate the pipe line, and gas in the piping to be replaced is purged. During this gas purge, by using the purge monitoring device according to the present invention to confirm that the gas has completely escaped, work on public roads can be carried out safely.

"First embodiment"
10 Gas meter 12 Inlet pipe 14 Outlet pipe 12A Union nut 14A Union nut 16 Meter cock 18 Cheese 18A Plug 20 Monitoring control device (purge monitoring device)
21 Housing 22 Gas recovery container (gas recovery container)
24 First adapter 26 Hose (branch pipe)
28 Second adapter 22A Opening/closing valve 30 Pressurizing device 32 Branch pipe 34 Needle valve 34A Handle 36 Gas monitoring unit 38 Monitoring piping (purge judgment section, airtightness judgment section)
40 Control unit 42 Microcomputer 42A CPU
42B RAM
42C ROM
42D input/output port (I/O)
42E Bus 44 Hard disk 46 Communication I/F
48 Pressure sensor (airtightness determination section)
50 Concentration sensor (purge judgment section)
50A Transmitting section 50B Receiving section 52 Opening/closing valve 54 Touch panel section 56 Start button 60 Startup determination section 62 Work information reception section 64 Work guidance control section 66 Work information storage section 68 Selection information reception section 70 Work content instruction section 72 Pressure judgment execution control section (Airtightness monitoring control unit before replacement, airtightness monitoring and control unit after replacement)
74 Purge judgment execution control unit (purge judgment control unit)
75 Timer 77 Opening/closing valve operation control unit “Second embodiment”
20A Monitoring control device 30A Pressure judgment control device 30B Rubber bulb 20S Monitoring control device (using smart gas meter)
54M monitor

Claims (6)

The purge monitoring device monitors the purge state when purging gas flowing through the flow path of the main pipe on the upstream side in the gas flow direction from the connection part of the branch pipe branched from the main pipe to the downstream side of the branch pipe. hand,
a purge determination unit that includes a sensor that detects a specific gas among the gases flowing through the flow path of the main pipe, and that determines that the specific gas has been purged;
An on-off valve that opens and closes the flow path of the branch pipe on the downstream side of the sensor;
a control unit that receives a purge execution instruction and controls the determination processing by the purge determination unit and the opening and closing of the on-off valve based on a predetermined order;
The control unit is executed as the specific gas purge mode before replacing a gas meter that counts the supply amount of combustion gas in a series of processes in the purge mode , and when the gas meter before replacement is installed. An airtight test is performed to determine whether or not the main pipe and the branch pipe are maintained airtight under the conditions in which the main pipe and the branch pipe are maintained.This is gas monitoring work in which a predetermined pressure is applied and the pressure state is monitored for a certain period of time. A pre-replacement pressure determination process and an airtightness test that is executed after the gas meter is replaced and determines whether the main pipe and the branch pipe are kept airtight with the replaced gas meter installed. and post-replacement pressure determination processing, which is gas monitoring work that applies a predetermined pressure and monitors the pressure state for a certain period of time .
The control unit includes a work content selection screen for accepting the selection of at least one of the pre-replacement pressure determination process and the post-replacement pressure determination process, and at least one of the pre-replacement pressure determination process and the post-replacement pressure determination process. A purge monitoring device that displays on a touch panel a work status notification screen that reports progress according to one process. The branch pipe is removable from the main pipe,
A monitoring pipe that becomes a part of the branch pipe is provided in the middle of the branch pipe, and the purge determination unit, the control unit, and the on-off valve connected to the monitoring pipe are housed in a housing. The purge monitoring device according to claim 1, characterized in that: 3. The purge monitoring device according to claim 1, wherein a gas recovery container is attached to the most downstream side of the branch pipe in the gas flow direction, and the purged gas is recovered. further comprising an airtightness determination unit that determines the airtightness of the flow path of the main pipe by monitoring the pressure of the flow path of the branch pipe,
The purge monitoring device according to any one of claims 1 to 3, wherein the control unit controls the determination operation by the airtightness determination unit. The branch pipe is removable from the main pipe,
A monitoring pipe that becomes a part of the branch pipe is provided in the middle of the branch pipe, and the purge judgment section, the airtightness judgment section, the control section, and the on-off valve connected to the monitoring pipe are provided. 5. The purge monitoring device according to claim 4, further comprising a housing for accommodating the purge monitoring device. A device that is connected to a branch pipe branched from the main pipe when replacing a gas meter that counts the amount of combustion gas supplied,
an airtightness determination unit that determines the airtightness of the main piping and the flow path of the branch pipe by monitoring the pressure of the flow path of the branch pipe;
The control section,
Before replacing the gas meter, pressurize the inside of the branch pipe with the on-off valve closed, and confirm that the airtightness of the main pipe and the flow path of the branch pipe is maintained by the airtightness determination section. a pre-replacement airtightness monitoring control unit that purges the pressurized portion at the time of
After replacing the gas meter, the combustion gas is sent from the main piping to the branch pipe with the on-off valve open, thereby purging the air in the main piping, and the purge determination section determines whether the air passes through the main piping. a purge determination control unit that closes the on-off valve when it is confirmed that the on-off valve has been purged;
After replacing the gas meter and making a purge decision by the purge decision control section, the branch pipe is pressurized with the on-off valve closed, and the airtightness decision section determines the airtightness of the flow paths of the main pipe and the branch pipe. and a post-replacement airtightness monitoring control unit that purges the pressurized portion once it is confirmed that the airtightness is maintained.
The pre-replacement airtightness monitoring control unit executes the pre-replacement pressure determination process, and the post-replacement airtightness monitoring control unit executes the post-replacement pressure determination process. Purge monitoring device as described in section.