JP2003166866A - Gas supply/interruption mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas leak detection device capable of detecting a gas leak in a great-flow gas supply line by a gas meter having a small-sized gas leak detection function. <P>SOLUTION: A small-sized cutoff valve 22 is installed on a detour passage 15 of this gas supply/interruption mechanism wherein an inflow route 12 of a supply gas and an outflow route 14 are linked by a main passage 11 and the detour passage 15, and a narrowed part 16 is provided in the detour passage 15, and a main valve mechanism 13 is closed when gas consumption is low and the main valve mechanism 13 is opened by utilizing a pressure loss of the narrowed part 16 when the gas consumption becomes high. By this constitution, the large-capacity gas supply line can be interrupted by the small-sized cutoff valve 22, and the line is not impacted because the main passage 11 is interrupted by the main valve mechanism 13 after interruption of the detour passage 15. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas supply / cutoff mechanism having a large capacity, capable of adjusting pressure from a small flow rate to a large flow rate with a simple mechanism, and having a small capacity despite having a large capacity. The present invention relates to a mechanism that shuts off a gas supply line with a shutoff valve.

[0002]

2. Description of the Related Art As shown in FIG. 8, a large-capacity gas supply / shutoff mechanism has a large shutoff valve 8 in a main passage 80 of a gas supply pipe.
1 is installed, a bypass flow path 83 having a narrowed portion 82 is provided midway from the main flow path 80, and a pilot adjuster 84 is disposed in the bypass flow path 83. From the bypass flow path 83 to the main valve mechanism 8
The one in which the conduit 88 is extended to the diaphragm chamber 87 of the pressure regulator 86 for activating the valve 5 and is in the communication state has been adopted so far.

In the conventional gas supply / shut-off mechanism described above, the shut-off valve 81 is opened in a normal state, and when the gas consumption is low, the gas is supplied to the consumer side only through the bypass passage 83, and the gas consumption is high. Then, pressure loss occurs in the narrowed portion 82 of the bypass passage 83, the pressure on the upstream side is high, the pressure on the downstream side is low, and the pressure in the diaphragm chamber 87 is also lowered, so that the spring 8
The main valve mechanism 85 is opened by the bias of 9.

When an abnormal situation such as an earthquake occurs, the shutoff valve 81 works to shut off the gas supply line.

[0005]

In the conventional large-capacity gas supply / shut-off mechanism described above, a large shut-off valve must be installed in a large-diameter gas supply pipe, which is problematic from an economical point of view. When the shutoff valve operates, the gas supply pipeline is impacted, which is not preferable from the viewpoint of maintenance of the pipeline.

In view of the above-mentioned problems of the prior art, the present invention enables a large capacity gas supply / cutoff mechanism to be shut off with a small shutoff valve, and also enables a large capacity gas supply pipeline to be shut off. An object of the present invention is to provide a gas supply / interruption mechanism that prevents an impact from occurring in a pipeline when the gas is interrupted.

[0007]

In order to solve the above problems, the present invention connects a supply gas inflow path and an outflow path with a main flow path and a bypass flow path, and the main flow path is operated by a pressure regulator. A main valve mechanism is provided, and a control valve that operates by a narrowed portion and a pilot regulator is provided in the bypass passage, and the bypass passage and the spring chamber or diaphragm chamber of the pressure regulator are in communication with each other. A small shutoff valve is provided in the bypass flow path of the mechanism, and the small shutoff valve is operated remotely by a wireless or telephone line or by an earthquake sensitive sensor. is there.

According to the present invention configured as described above, a large capacity gas supply pipeline can be blocked by a small shutoff valve, and the pipeline can be prevented from being impacted when shutting off. .

The bypass flow passage includes a spring chamber of the pressure regulator, and the flow passage includes a diaphragm chamber of the pressure regulator. With this configuration, the response can be made faster and the entire mechanism can be made smaller.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 relates to the first embodiment, and a main flow path 11 extends from an inflow path 12 for supply gas to an outflow path 14 via a main valve mechanism 13, and a bypass flow path 15 is led out from the inflow path 12 and a narrowed portion 16 is formed. A small shut-off valve 22 that is externally attached through the formed flow path from the other side of the spring chamber 19 and the adjustment valve 21 that is operated by the pilot adjustment device 20 and faces the spring chamber 19 of the diaphragm 18 of the pressure regulator 17.
To the outflow passage 14 of the supply gas.

A valve 23 made of an elastomer is provided at a central supporting portion of the diaphragm 18 of the pressure regulator 17, and a valve seat 24 is raised from the main body 10 so as to face the valve 23.

In this embodiment, the supply gas outlet 14
When the flow rate of the pressure regulator 17 is small, the pressure loss in the narrowed portion 16 of the bypass passage 15 is small, and therefore the diaphragm 18 of the pressure regulator 17 is
Does not operate, the main valve mechanism 13 is closed, and when the flow rate increases, the pressure loss increases, the pressure on the downstream side of the narrowed portion 16 decreases, the diaphragm 18 rises, the main valve mechanism 13 opens, and gas flows through the main flow path. While flowing, the supply gas also flows through the bypass passage 15.

When an abnormality occurs in the gas supply line, a small shut-off valve externally attached to the bypass flow passage works to shut off the bypass flow passage, and when the bypass flow passage is shut off, the main valve mechanism also closes to supply gas. The entire pipeline is shut off.

As a modification of the above embodiment, the provision of the bypass passage 15 from the inflow passage 12 is stopped and a small hole h is formed in the central support portion of the diaphragm 18 as shown in FIG. 1 (b). The narrowed portion may be communicated with the spring chamber 19.

FIG. 2 relates to the second embodiment, and the main flow path 11
Is a slide-type main valve mechanism 1 from a supply gas inflow path 12
3 to reach the outflow passage 14, and the bypass passage 15 is connected to the inflow passage 1
2 through the sleeve 25 provided with the narrowed portion 16 (orifice) and provided with the narrowed portion 16 (orifice), the adjusting valve 21 of the pilot adjuster 20, and the seismic-sensitive microcomputer gas meter M externally attached to reach the supply gas outflow passage 14. The sleeve 25 provided with the narrowed portion 16 (orifice) and the spring chamber 19 of the pressure regulator 17 are in communication with each other through the hole H.

In this embodiment, the supply gas outlet 14
When the flow rate is small, the pressure loss at the narrowed portion 16 (orifice) of the bypass passage 15 is small, so the diaphragm 18 of the pressure regulator 17 does not operate and the main valve mechanism 13 is closed.
When the flow rate increases, the pressure loss increases, the pressure on the downstream side of the narrowed portion 16 (orifice) decreases, the pressure in the communicating spring chamber 19 also decreases, the diaphragm 18 rises, and the shaft 26 moves the force point W of the lever 27. When the valve is pulled up, the point of action S causes the main valve mechanism 13 to retreat and open, and the gas flows through the main flow path and the supply gas also flows through the bypass flow path 15.

Here, if an abnormality occurs in the gas supply pipe, it is externally attached to the bypass passage 15, but the earthquake-sensitive microcomputer gas meter M works to shut off the bypass passage, and when the bypass passage is shut off, the main valve mechanism 13 Is also closed and the entire gas supply line is shut off.

As a modification of the above embodiment, the provision of the bypass passage 15 from the inflow passage 12 is stopped and a small hole h is formed in the center support portion of the diaphragm 18 as shown in FIG. 2 (b). The narrowed portion may be communicated with the spring chamber 19.

FIG. 3 relates to the third embodiment and relates to the main flow path 11
Goes from the supply gas inflow path 12 to the outflow path 14 via the main valve mechanism 13 of the pressure regulator 17, and the bypass flow path 15 is led out from the inflow path 12 to constrict the narrowed portion 16 and the pilot regulator 2.
It reaches the supply gas outflow passage 14 through the adjusting valve 21 of 0 and the earthquake sensitive microcomputer gas meter M. The narrowed portion 16
The downstream side of the pressure regulator 17 and the diaphragm chamber 28 of the pressure regulator 17 are connected by a conduit 29 to establish a communication state. The pressure regulator 1
The spring chamber 19 of No. 7 and the spring chamber 19 'of the pilot regulator 20 communicate with the atmosphere and are in equilibrium.

Further, the above earthquake-sensitive microcomputer gas meter M
A receiver can be attached to the remote control center, and it can be remotely controlled by a telephone line or wirelessly with the management center. Conversely, it can be monitored whether the gas supply line is blocked.

In this embodiment, the supply gas outlet 14
When the flow rate is small, the pressure loss in the narrowed portion 16 of the bypass passage 15 is small, so the pressure in the diaphragm chamber 28 of the pressure regulator 17 does not decrease and the main valve mechanism 13 remains closed, leaving only the bypass passage 15. Gas is flowing.

When the flow rate in the outflow passage 14 increases, the narrowed portion 16
Pressure loss in the downstream side decreases, the pressure in the diaphragm chamber 28 communicating with the bypass flow path 15 decreases, the diaphragm 18 descends, and the main valve mechanism 13 integrated with the shaft 26 opens and the main flow occurs. As the gas flows through the passage, the supply gas also flows through the bypass passage 15.

Here, if an abnormality occurs in the gas supply pipe, it is externally attached to the bypass passage 15, but the seismic-sensitive microcomputer gas meter M works to shut off the bypass passage, and when the bypass passage is shut off, the main valve mechanism 13 Is also closed and the entire gas supply line is shut off.

FIG. 4 relates to the fourth embodiment, and the main flow path 11
Goes from the supply gas inflow path 12 to the outflow path 14 via the main valve mechanism 13 of the pressure adjuster 17, and the bypass flow path 15 is led out from the inflow path 12 and the adjusting valve 2 of the pilot adjuster 20.
1, the narrowed portion 16 and the earthquake sensitive microcomputer gas meter M to reach the supply gas outflow passage 14. The narrowed portion 16
Of the pressure regulator 17 and the diaphragm chamber 28 of the pressure regulator 17 are connected by a conduit 29 to establish a communication state, and the downstream side of the narrowed portion 16 and the diaphragm chamber 28b of the pilot regulator 20 are connected to the conduit 2
They are connected by 9b to establish communication. The pressure regulator 1
The spring chamber 19 of No. 7 and the spring chamber 19 'of the pilot regulator 20 communicate with the atmosphere and are in equilibrium.

In this embodiment, the supply gas outlet 14
When the flow rate is small, the pressure loss in the narrowed portion 16 of the bypass passage 15 is small, so the pressure in the diaphragm chamber 28 of the pressure regulator 17 does not rise, the main valve mechanism 13 remains closed, and the downstream side of the narrowed portion 16 is closed. Since the pressure does not change, the bypass flow path 15
Only the gas is flowing.

When the flow rate in the outflow passage 14 increases, the narrowed portion 16
Pressure loss in the downstream side decreases, the pressure in the diaphragm chamber 28b of the pilot adjuster 20 in the communicating state through the conduit 29b also decreases, the adjusting valve opens wide, and the pressure on the upstream side of the narrowed portion 16 decreases. The pressure in the diaphragm chamber 28 of the pressure regulator 17 which is in communication with the conduit 29 also increases, the diaphragm 18 rises together with the shaft 26, the main valve mechanism 13 opens, and the gas flows into the main flow path and the bypass flow path 15 Also the supply gas is flowing.

If an abnormality occurs in the gas supply line, an earthquake-sensitive microcomputer gas meter M externally attached to the bypass flow path 15
Acts to block the bypass flow path, and when the bypass flow path is blocked, the main valve mechanism 13 is also closed and the entire gas supply pipeline is blocked.

FIG. 5 relates to the fifth embodiment and relates to the main flow path 11
Goes from the inflow path 12 of the supply gas to the outflow path 14 via the main valve mechanism 13 of the pressure regulator 17, and the bypass flow path 15 is led out from the inflow path 12 and is operated by the narrowed portion 16 and the seismic sensor S. The cutoff valve 22 and the adjusting valve 21 of the pilot adjuster 20 reach the supply gas outflow passage 14. The downstream side of the narrowed portion 16 and the spring chamber 19 of the pressure regulator 17 are connected by a conduit 29 to establish a communication state. Also,
A valve 2 made of elastomer on the back side of the diaphragm
3 is attached, and the valve seat 24 is provided so as to face it. The spring chamber 1 of the pressure regulator 17
9 and the spring chamber 19 'of the pilot regulator 20 communicate with the atmosphere and are in equilibrium.

In this embodiment, the supply gas outflow passage 14 is used.
When the flow rate is small, the pressure loss in the narrowed portion 16 of the bypass flow path 15 is small, so the spring chamber 1 of the pressure regulator 17 is
The pressure of 9 does not decrease and the main valve mechanism 13 remains closed, and the gas flows only in the bypass passage 15.

When the flow rate in the outflow passage 14 increases, the narrowed portion 16
Pressure loss in the downstream side decreases, the pressure in the spring chamber 19 of the pressure regulator 17 communicating with the conduit 29 decreases, the diaphragm 18 rises, and the main valve mechanism 13 opens to open the main flow path. Gas flow to the detour flow path 1
The supply gas is flowing also in 5.

When an earthquake occurs here, an earthquake sensitive sensor T
Is activated and the shutoff valve 22 attached to the bypass flow passage 15 works to shut off the bypass flow passage, and when the bypass flow passage is shut off, the main valve mechanism 1
3 is also closed and the entire gas supply line is shut off.

FIG. 6 relates to the sixth embodiment and relates to the main flow channel 11
Goes from the inflow passage 12 of the supply gas to the outflow passage 14 via the main valve mechanism 13 of the pressure regulator 17, and the bypass flow passage 15 is led out from the inflow passage 12, and the narrowed portion 16, the shutoff valve 22 and the pilot regulator. It reaches the supply gas outflow passage 14 through the adjusting valve 21 of 20. The spring chamber 19 'of the pilot adjuster 20 communicates with the atmosphere and is in equilibrium.

The downstream side of the narrowed portion 16 and the spring chamber 19 of the pressure regulator 17 are connected by a conduit 29 to establish a communication state. The force point W of the lever 27 is in contact with the shaft 26 attached to the diaphragm 18, and the main valve mechanism 13 is moved at the action point S.

In this embodiment, the supply gas outlet 14
When the flow rate is small, the pressure loss in the narrowed portion 16 of the bypass flow path 15 is small, so the spring chamber 1 of the pressure regulator 17 is
The pressure of 9 does not decrease, and the main valve mechanism 13 remains closed, and the gas is flowing only to the bypass passage 15.

When the flow rate in the outflow passage 14 increases, the narrowed portion 16
Pressure loss in the downstream side decreases, the pressure in the spring chamber 19 of the pressure regulator 17 communicating with the conduit 29 decreases, the diaphragm 18 rises, and the main valve mechanism 13 opens to open the main flow path. Gas flow through the detour flow path 1
The supply gas is flowing also in 5.

When an earthquake occurs here, an instruction to close the shutoff valve 22 is issued from the management center, and the receiver receives the command to shut off the bypass passage 15 by operating the shutoff valve 22 attached to the bypass passage 15. When the flow path 15 is shut off, the main valve mechanism 13 is also closed and the entire gas supply pipeline is shut off.

FIG. 7 relates to the seventh embodiment and relates to the main flow path 11
Goes from the supply gas inflow path 12 to the outflow path 14 via the main valve mechanism 13 of the pressure regulator 17, and the bypass flow path 15 is led out from the inflow path 12 to shut off the shutoff valve 22 and the pilot regulator 2.
It reaches the supply gas outflow passage 14 through the adjustment valve 21 of 0 and the narrowed portion 16. The upstream side of the narrowed portion 16 and the diaphragm chamber 28 of the pressure regulator 17 are connected by a conduit 29 to establish a communication state, and the downstream side of the diaphragm chamber 28b of the pilot regulator 20 is connected by a conduit 29b to establish a communication state. ing. Further, the diaphragm 18 and the main valve mechanism 13 are connected by a valve rod. The spring chamber 1 of the pressure regulator 17
9 and the spring chamber 19 'of the pilot regulator 20 communicate with the atmosphere and are in equilibrium.

In this embodiment, the supply gas outflow passage 14 is used.
When the flow rate is small, the pressure loss in the narrowed portion 16 of the bypass passage 15 is small, so the pressure in the diaphragm chamber 28 of the pressure regulator 17 does not rise and the main valve mechanism 13 remains closed, leaving only the bypass passage 15. The gas is flowing.

When the flow rate in the outflow passage 14 increases, the narrowed portion 16
The pressure loss in the pipe becomes large, the pressure in the upstream side becomes high, the pressure in the diaphragm chamber 28 communicating with the conduit 29 becomes high, the diaphragm 18 rises, the valve mechanism 13 opens, and the gas flows in the main flow path, resulting in constriction. The pressure on the downstream side of the portion 16 decreases and the pressure in the diaphragm chamber 28b also decreases, so that the regulating valve 21 further opens and the supply gas also flows into the bypass passage 15.

When an abnormality occurs in the gas supply conduit, the shutoff valve 22 attached to the bypass passage 15 is closed to shut off the bypass passage 15, and when the bypass passage 15 is shut off, the main valve mechanism 13 is also closed. The entire gas supply line is shut off.

[0041]

As described above, according to the present invention,
By connecting the inflow path and the outflow path of the supply gas with the main flow path and the bypass flow path forming the narrowed portion on the way, the main valve mechanism of the main flow path is opened and closed by utilizing the pressure loss of the narrowed portion. By installing a shutoff valve in the bypass passage, it becomes possible to shut off a large-capacity gas supply pipeline with a small shutoff valve, and the main passage is shut off after the bypass passage is shut off. There is no shock to.

[Brief description of drawings]

FIG. 1 is a sectional view of (a) a first embodiment and (b) a modified example thereof.

FIG. 2 is a sectional view of (b) a second embodiment and (b) a modified example thereof.

FIG. 3 is a sectional view of a third embodiment.

FIG. 4 is a sectional view of a fourth embodiment.

FIG. 5 is a sectional view of a fifth embodiment.

FIG. 6 is a sectional view of a sixth embodiment.

FIG. 7 is a sectional view of a seventh embodiment.

FIG. 8 is a sectional view of a conventional gas supply / cutoff mechanism.

[Explanation of symbols]

11 main flow path 12 Inflow path 13 Main valve mechanism 14 Outflow path 15 Detour flow path 16 Stenosis 17 Pressure regulator 18 diaphragm 19,19 'spring chamber 20 Pilot adjuster 21 Regulator valve 22 Shut-off valve 23 valves (elastomer) 24 valve seat 25 sleeves 26 axes 27 lever 28, 28b diaphragm chamber 29,29b conduit H hole h small hole S point of action T earthquake sensitive sensor W power point

Continued front page    F term (reference) 2F030 CB01 CC13 CE09 CF05 CF11                 3J071 AA02 BB11 BB14 CC13 CC14                       DD14 EE02 EE24 FF03                 5H316 AA11 BB05 DD03 DD06 DD07                       DD11 EE02 EE10 EE12 HH04                       HH15 HH16 JJ01 JJ13 KK02                       KK04 KK05 LL05

Claims (7)

[Claims] 1. A main flow path and a bypass flow path connecting a supply gas inflow path and an outflow path, a main valve mechanism operated by a pressure regulator is provided in the main flow path, and a narrowed portion is provided in the bypass flow path. A small shut-off valve is provided in the bypass passage of the pressure adjusting mechanism that provides a regulating valve that operates by a pilot adjuster, and makes the bypass passage and the spring chamber or diaphragm chamber of the pressure adjuster communicate with each other. A gas supply / cutoff mechanism characterized by the above. 2. The gas supply / cutoff mechanism according to claim 1, wherein the cutoff valve is operated by an earthquake sensitive sensor. 3. The gas supply / cutoff mechanism according to claim 1, wherein an earthquake-sensitive microcomputer gas meter is adopted as the shutoff valve. 4. The gas supply / interruption mechanism according to claim 1, wherein the bypass passage includes a spring chamber of a pressure regulator. 5. The gas supply / interruption mechanism according to claim 1, wherein the diaphragm chamber of the pressure regulator constitutes a part of the main flow path. 6. The main valve mechanism is formed on the back side of the diaphragm of the pressure regulator.
The gas supply / interruption mechanism according to any one of 1. 7. A small hole is formed in a central support portion of a diaphragm of the pressure regulator, and the small hole is communicated with a spring chamber of the pressure regulator through the small hole. The gas supply / cutoff mechanism described in.