JPS6342208B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a peripheral device for a terminal gas meter in a gas supply flow path that supplies, for example, city gas, propane gas, natural gas, etc. to terminal consumption equipment through a meter. When cutting off the gas flow path to the meter,
It is possible to cut off the gas supply to the meter without interrupting the gas supply to the terminal consumption equipment, and
To provide a terminal gas meter peripheral device for city gas, propane gas, natural gas, etc., which can always supply clean gas without contamination with foreign matter or air.

Conventionally, when performing maintenance such as inspection, adjustment, or replacement of city gas or other terminal gas meters, the gas flow path has been shut off in front of the terminal gas meter. Immediately before the start of work, the consumer may be using gas and shut off the gas, or during work, turn off the terminal gas stove,
If you open a gas burner, etc. and carelessly leave it in that state, the terminal gas stove, gas burner, etc. will remain open in any case, so you can close the gas flow path after work. When the electricity is restarted, raw gas is directly released, and it becomes a source of disasters or explosions that can immediately affect human life, such as terrible gas poisoning or death. Impurities other than combustible gases are mixed in, but it is normally supplied to consumers through terminal gas meters, which makes it difficult to maintain the accuracy of the terminal gas meters, making it difficult to accurately measure the amount of gas used. There were drawbacks such as the failure to indicate numerical indicators, which hindered accurate instrument management.

The purpose of the present invention is to enable maintenance work to be performed without interrupting the supply of gas to consumers when inspection, adjustment, replacement, etc. of terminal gas meters become necessary, thereby preventing disasters associated with the work. In addition to preventing the occurrence of gas, impurities in city gas, etc. are removed and clean gas can be sent to consumers via the terminal meter, thereby maintaining the accuracy of the meter, thereby eliminating the above-mentioned drawbacks of the conventional In addition, by installing a filtration device for removing impurities upstream of the gas meter, even when the filter of the filtration device needs to be cleaned or replaced, gas can be supplied to consumers. The area around the terminal gas meter in the gas supply flow path for city gas, propane gas, natural gas, etc., which enables such work to be performed without interruption, has excellent safety and workability, and contributes to maintaining the accuracy of the terminal meter. The aim is to provide a device for this purpose.

The gas meter peripheral device according to the present invention includes a three-way switching valve disposed upstream of the gas meter to switch and branch the gas supply source flow path into a main flow channel and a sub flow channel, and the gas meter is disposed within this main flow channel. The main flow path and the sub flow path are respectively connected through check valves.
Interrupting the gas supplied to the terminal consumer equipment by connecting the supply channel leading to the terminal consumer equipment and selectively sending the gas to the main channel and/or the sub channel by operating the three-way switching valve. Another feature is that maintenance such as inspection, adjustment, and replacement of the terminal gas meter can be performed without causing air intrusion.

The embodiments shown in the drawings will be described below.

1 to 3 show a gas meter peripheral device according to the present invention, in which A is a gas meter and B is a gas meter.
C indicates a gas supply flow path, and C indicates a gas supply flow path leading to the terminal consumer device. According to the present invention, a three-way switching valve D is arranged upstream of the gas meter A to switch and branch the gas supply flow path into a main flow path E and a sub flow path F, and the gas meter A is placed within this main flow path E. do. The main flow path E and the sub flow path F are connected to the flow path C via check valves G and H, respectively, and the main flow path E, the sub flow path F, or both are connected by operating the three-way switching valve D. It is now possible to selectively send gas.

FIG. 1 shows a normal gas supply situation, in which gas is passed from channel B to main channel E by means of switching valve D, and after passing through meter A, is sent via channel C to the consumer equipment. When inspecting, adjusting, or replacing the meter, operate the three-way switching valve D as shown in Figure 2 to switch between the main flow path E and the sub flow path F.
Gas is sent to both of the sub-channels F, and the air in the sub-channel F is expelled. Next, the three-way switching valve D is operated to the position shown in FIG. 3 to block the main flow path E and connect the flow path B to the flow path C via the sub flow path F. Thereby, the gas supply source flow path can be switched from the main flow path to the sub flow path without interrupting the gas supply, and maintenance, replacement, etc. of the meter A can be accomplished here. After completing the work, operate the three-way switching valve D in the reverse order of the above. That is, first, operate the three-way switching valve D to the position shown in Fig. 2 to release the air in the meter, and maintain the gas supply through the sub-channel F, and then turn the switching valve Return meter A to the position shown in Figure 1.
Restore the gas supply flow path through.

As described above, the present invention interposes the check valves G and H between the gas supply passage C and the main passage E and the sub passage F, respectively, and also interposes the check valves G and H between the gas supply passage B and the main passage E, respectively.
A three-way switching valve D is interposed between the sub-channel F and the three-way switching valve is operated to selectively send gas to the main channel, the sub-channel, or both, thereby supplying gas to the terminal consumption equipment. This makes it possible to perform maintenance such as inspection, adjustment, and replacement of the terminal gas meter without interrupting the gas supply or introducing air into the gas meter. The invention therefore allows gas consumers to avoid the dangers that may arise due to interruptions in the gas supply while using the consumption appliance, and to always maintain accurate control of the meter.

[Brief explanation of the drawing]

1, 2, and 3 schematically show the gas meter peripheral device according to the present invention, in which FIG. 1 shows a state in which gas is sent to the main flow path, and FIG. Indicates the state in which gas is sent. FIG. 3 shows a state in which gas is sent to the sub-channel. A...Gas meter, B...Gas supply channel, C
...Gas supply flow path leading to consumer equipment, D...Three-way switching valve, F...Main flow path, F...Sub flow path, G, H...
…non-return valve.

Claims (1)

[Claims] 1. A gas meter A is provided in the main gas channel E,
Separately, a sub-flow path F allows gas from the gas supply source flow path B to flow into the gas supply flow path C without passing through the main flow path E during operations such as inspection, adjustment, and replacement of the terminal gas meter. In the gas meter peripheral device provided for this purpose, check valves G and H are interposed between the gas supply path C, the main flow path E, and the sub flow path F, respectively, and the gas supply source flow path B and the main flow path A three-way switching valve D is interposed between E and the auxiliary flow path F, and by operating the three-way switching valve, gas is selectively sent to the main flow path, the auxiliary flow path, or both, thereby reducing terminal consumption. A gas meter peripheral device characterized in that maintenance such as inspection, adjustment, and replacement of a terminal gas meter can be performed without interrupting the gas supplied to the device or causing air to enter the device.