JP2895425B2 - Gas meter outlet side pressure regulation type gas pressure regulator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquefied gas supply system such as propane gas supplied to a gas consuming device via a gas meter having a shut-off valve built therein, which decompresses gas from a liquefied gas container. It relates to the gas pressure regulator used.

[0002]

2. Description of the Related Art In a general liquefied gas supply system,
Since the gas meter measures the flow rate of the gas depressurized to a predetermined pressure by the pressure regulator, the gas meter is disposed downstream of the gas pressure regulator, and the diaphragm of the gas pressure regulator is used for the pressure regulation operation. The pressure introduced into the chamber is the pressure on the inlet side of the gas meter. As a result, the gas pressure supplied to the gas consuming equipment via the gas meter is affected by fluctuations in the flow resistance of the gas meter due to fluctuations in gas consumption and the operation of the gas shut-off valve in the gas meter. As a result, stable adjustment ability cannot be maintained. For this reason, there is a demand for measures for securing stable adjustment ability.

In order to compensate for pressure loss due to resistance between a gas supply source and a gas consuming device after decompression, a gas pressure regulator of a meter outlet pressure regulation type has been proposed. This type of gas pressure regulator generally adjusts the pressure by feeding the downstream pressure back to the pressure regulator through an introduction pipe or the like, and is used in industrial governors and the like. This type of meter outlet pressure adjusting type gas pressure regulator is not particularly problematic if a shut-off valve is not built in the gas meter.However, if a recent gas meter with a built-in shut-off valve is used, Is an abnormal condition in which the shut-off valve is shut off for any reason, gas leaks downstream of the shut-off valve, or even if there is no gas leak, the pressure downstream of the shut-off valve drops due to gas usage or temperature drop In, the pressure regulator opens a nozzle connected to the gas supply in an attempt to supply gas to keep the gas pressure constant. As a result, the gas flows through the gas pressure regulator to the shutoff valve of the gas meter, but since the pressure on the downstream side of the shutoff valve does not increase, the shutoff valve remains closed. Pressure rises to the source pressure of the gas supply source, which is dangerous.

[0004]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to introduce a pressure near the outlet of a gas meter into a diaphragm chamber to accurately correct the influence of the flow resistance of the gas meter and maintain stable adjustment performance. In addition, even if an abnormal condition occurs in which the pressure on the downstream side of the shut-off valve decreases during the shut-off operation of the shut-off valve in the gas meter, the danger of the pressure on the upstream side of the shut-off valve rising to the original pressure can be accurately determined. It is to provide a liquefied gas pressure regulator that can be avoided.

[0005]

A gas pressure regulator according to the present invention is disposed upstream of a gas meter 15 having a shut-off valve 27 therein, and a pressure near a gas meter inlet is introduced into a diaphragm lower chamber 17. Adjusting means 1; second pressure adjusting means 2 arranged downstream of the gas meter 15 for introducing pressure near the gas meter outlet into the lower diaphragm chamber 6 and communicating the upper diaphragm chamber 26 with the atmospheric pressure through a vent 38. The diaphragm shaft 19 of the first pressure adjusting means 1 and the diaphragm shaft 23 of the second pressure adjusting means 2 are inserted and communicate with the diaphragm lower chamber 17 of the first pressure adjusting means 1, and A hollow portion 13 blocked from the lower diaphragm chamber 6; a liquefied gas container disposed in the hollow portion 13 so as to face the nozzle 3; A valve body 4 for adjusting an inflow amount of gas from 14; a passive arm portion 10a disposed in the hollow portion 13;
9 is engaged with the drive unit 20, and the operation arm unit 10b is
And the first operating lever 10 for adjusting the opening of the valve body 4 in conjunction with the movement of the diaphragm 21;
3, the passive arm portion 11 a is engaged with the driving portion 24 of the diaphragm shaft 23 of the second pressure adjusting means 2, the operation arm portion 11 b contacts the valve body 4, and interlocks with the movement of the diaphragm 25. A second operation lever (11) for adjusting the opening of the valve body (4) is provided.

Further, the gas pressure regulator according to the present invention is disposed in the upper chamber 26 of the diaphragm of the second pressure regulating means 2 and has a predetermined weight for controlling the gas supplied to the gas consuming equipment 16 by the pressure after passing through the gas meter. A pressure adjusting spring 9 set in the upper part of the diaphragm 5 of the first pressure adjusting means 1 and having a load substantially corresponding to the maximum pressure resistance value generated when the gas of the gas meter display volume passes through the inside of the gas meter. A set pressure adjusting spring 8; disposed in the hollow portion 13,
And a diaphragm lower chamber 6 of the second pressure adjusting means 2 and a diaphragm upper chamber 5 of the first pressure adjusting means 1 connected by a passage 7.

The driving of the diaphragm shaft 19 of the first pressure adjusting means 1 is performed so that the first operating lever 10 moves in the valve closing direction following the movement of the diaphragm 21 but does not move effectively in the valve opening direction. The portion 20 and the passive arm portion 10a of the first operating lever 10 are engaged with a play interval, and the second operating lever 11 moves in the valve closing direction following the movement of the diaphragm 25, but in the valve opening direction. The drive portion 24 of the diaphragm shaft 23 of the second pressure adjusting means 2 and the passive arm portion 11a of the second operation lever 10 are engaged with a play interval so as not to move effectively.

The pressure P ₂ applied to the upper surface of the diaphragm 21 and the pressure P ₁ applied to the lower surface of the diaphragm 21 of the first pressure adjusting means 1 are usually the same, or the pressure P ₁ is adjusted to a slightly higher pressure. The diaphragm 21 is pushed down by the spring 8. When the diaphragm 21 is in the position where the diaphragm 21 is deeply pushed down as shown in FIG. 1, the operation arm portion 10 b of the first operation lever 10 is sufficiently separated from the valve body 4, and the operation portion 10 b pushes the valve body 4. There is no. On the other hand,
Diaphragm upper chamber 26 of the second pressure regulating means 2 is in communication with atmospheric pressure through the vent hole 38, the diaphragm 25 of the second pressure regulating means 2 is controlled by the force of the pressure P ₂ and the spring 9 acting on the lower surface The operating arm 11b of the second operating lever 11 of the second pressure adjusting means 2 is in a position where the operating arm 11b abuts on the valve body 4 and can press the valve body 4.

That is, in a normal use state, only the second pressure adjusting means 2 functions as a meter outlet pressure adjusting type pressure regulator, and the first pressure adjusting means 1 does not function. The pressure near the outlet of the gas meter 15 increases, and the pressure P ₂ applied to the lower surface side of the diaphragm 25 of the second pressure adjusting means ₂
Is greater than the pressing force of the pressure adjusting spring 9,
The diaphragm 25 is pushed up, and the driving arm 24 of the diaphragm shaft 23 raises the passive arm 11a of the second operation lever 11. By the swing of the second operation lever 11, the operation arm 11b pushes down the valve body 4 toward the nozzle 3. On the other hand, gas meter 15
The pressure near the exit is reduced in the pressure P ₂ applied to the lower surface side of the diaphragm 25 is smaller than the force of the spring 9, the diaphragm 25 is pushed down, the passive arm 1
Drive unit 2 of diaphragm shaft 23 supporting 1a
Since the 4 moves downward, the second operation lever 11 swings by its own weight, and the operation arm 11b separates from the valve body 4.
At the same time, the valve element 4 is separated from the nozzle 3 by the gas pressure from the nozzle 3 and the force of the valve element lifting spring 12. The flow of the gas passing through the nozzle 3 is controlled by the opening degree adjustment by the valve body 4, and the gas pressure is adjusted to be constant.

When an abnormal condition occurs in which the pressure on the downstream side of the shut-off valve, that is, the pressure on the outlet side of the gas meter 15 decreases due to some cause such as gas leakage, gas use, or temperature drop during the shut-off operation of the shut-off valve 27 in the gas meter 15. since the pressure P ₂ applied to the upper surface of the first pressure regulating means 1 of the diaphragm 21 is lowered, the pressure difference between the pressure P ₂ applied to the upper surface of the pressure P ₁ and the diaphragm 21 acting on the lower surface side of the diaphragm 21 ' P ₁ -P ₂ ] is increased,
When the force due to the pressure difference exceeds the depressing force of the spring 8, the diaphragm 21 of the first pressure adjusting means 1 is pushed up as shown in FIG. 2, and the first operating lever 10 is driven by the driving unit 20 of the diaphragm shaft 19. Is lifted. The operation arm portion 10 abutting on the valve body 4 by the swing of the first operation lever 10
Since b pushes down the valve body 4 toward the nozzle 3 and closes the nozzle 3, supply of gas to the gas meter 15 via the cavity 13 of the pressure regulator is prevented. for that reason,
The pressure on the upstream side of the shutoff valve does not rise to the original pressure of the gas container 14.

As described above, the shut-off valve 2 in the gas meter 15
When the 7 meter outlet pressure during shutoff operation is lowered by some reason, the pressure P ₂ of the second pressure regulating means 2 of the diaphragm lower chamber 6 is lowered, the diaphragm 25 of the second pressure regulating means 2 is the Since the driving unit 24 of the diaphragm shaft 23 supporting the passive arm unit 11a is largely pushed down by the spring 9, the second operation lever 11 swings by its own weight, and the operation arm unit 11b is moved from the valve body 4 by the own weight. Leave enough. Therefore, the second pressure adjusting means 2 does not function as a meter outlet pressure adjusting type pressure adjuster.

[0012]

In the embodiment of the invention shown in FIGS. 3 to 7, the gas containers 14 are prepared separately in two or two groups and connected to an automatic switching regulator 30 by high-pressure hoses 28, 29. ing. The gas depressurized to a medium pressure by the automatic switching regulator 30 having a known operation principle is supplied to the cavity 13.
From the lower communication passage 37 through the nozzle 3 to the cavity 1
3 and flows from the cavity 13 to the gas meter 15 through the entrance-side passage 32. Part of the gas also fills the lower diaphragm chamber 17 of the first pressure adjusting means. The gas from the gas meter 15 is sent to the gas consuming device 16 through the outlet side passage 33 and the low pressure pipe 34. At the connection between the outlet side passage 33 and the low-pressure pipe 34, an outlet side pressure introduction passage 35 communicating with the diaphragm lower chamber 6 of the second pressure adjusting means 2 is provided.

Each of the pressure adjusting spring 8 of the first pressure adjusting means 1 and the pressure adjusting spring 9 of the second pressure adjusting means 2 is constituted by a compression coil spring, and the lifting spring 12 of the valve body 4 is constituted by a tension coil spring. Have been. First pressure adjusting means 1
The drive unit 20 of the diaphragm shaft 19 and the drive unit 24 of the diaphragm shaft 23 of the second pressure adjusting means 2
Each of them has a sufficiently long through hole. A valve body guide 36 is suspended and fixed in the hollow portion 13, and the upper part of the valve body 4 is fitted to be vertically movable. The airtight cutoff between the diaphragm lower chamber 6 of the second pressure adjusting means 2 and the cavity 13 is performed by a bellows-shaped sealing member 31. The first operation lever 10 is formed in a bell crank shape in which the passive arm portion 10a is longer than the operation arm portion 10b,
At a position near the operation arm 10b, the horizontal shaft pin 18
, And is pivotally attached to the valve body guide 36. The second operating lever 11 also has a passive arm portion 11a formed in a bell crank shape longer than the operating arm portion 11b.
Is pivotally connected to the valve body guide 36 by the horizontal shaft pin 22 at a position close to. The distal ends of the operation arms 10b and 11b that are in contact with the valve body 4 are all rounded.

[0014]

According to the gas pressure regulator of the present invention configured as described above, the pressure P at the gas meter inlet side caused by the flow of gas consumed by the gas consuming device 16 at the end is obtained.
_When the difference between ₁ and the pressure P ₂ at the gas meter outlet side is smaller than the set differential pressure, the pressure is adjusted in the second pressure adjusting means 2 by the pressure at the gas meter downstream side, so that the gas passes through the gas meter 15. In this case, the flow resistance generated at the time of the correction can be accurately corrected, and a stable adjustment pressure can be maintained.

If an abnormal condition occurs in which the pressure on the downstream side of the shut-off valve drops due to some cause such as gas leakage, gas use, or temperature drop during the shut-off operation of the shut-off valve 27 in the gas meter 15, the first pressure adjusting means When the force caused by the differential pressure [P ₁ −P ₂ ] between the pressure P ₁ applied to the lower surface side of the first diaphragm 21 and the pressure P ₂ applied to the upper surface side exceeds the depressing force of the spring 8, the first pressure adjusting means 1 The diaphragm 21 is pushed up, and the operation arm 10b of the first operation lever 10 pushes down the valve body 4 and closes the nozzle 3, so that the supply of gas to the gas meter 15 via the cavity 13 is prevented. In other words, a dangerous state in which the pressure on the upstream side of the shutoff valve rises to the original pressure of the gas supply source can be properly avoided.

Further, by a simple operation procedure of closing the gas outlet on the outlet side and opening the shut-off valve 27 in the gas meter, the return operation after the gas shut-off can be easily performed.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of a gas pressure regulator according to the present invention, showing a case where pressure is adjusted by a second pressure adjusting means.

FIG. 2 is a conceptual diagram of the gas pressure regulator, showing a case where pressure is regulated by a first pressure regulating means.

FIG. 3 is a schematic front view of a liquefied gas supply system in which a gas pressure regulator according to an embodiment of the present invention is incorporated at a stage subsequent to an automatic switching regulator.

FIG. 4 is a plan view of the gas pressure regulator of FIG. 3;

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is a sectional view taken along line BB of FIG. 5;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 1st pressure adjustment means 2 2nd pressure adjustment means 3 Nozzle 4 Valve body 5 Diaphragm upper chamber of 1st pressure adjustment means 6 Diaphragm lower chamber of 2nd pressure adjustment means 7 Communication passage 8 Pressure adjustment of 1st pressure adjustment means Spring 9 for pressure adjustment of second pressure adjusting means 10 First operating lever 11 Second operating lever 12 Spring for lifting valve 13 Cavity 14 Liquefied gas container 15 Gas meter 16 Gas consuming device 17 Diaphragm of first pressure adjusting means Lower chamber 18 Shaft pin of first operating lever 19 Diaphragm shaft of first pressure adjusting means 20 Diaphragm shaft drive section of first pressure adjusting means 21 Diaphragm of first pressure adjusting means 22 Shaft pin of second operating lever 23 Second Diaphragm shaft 24 of pressure adjusting means Drive section 2 of diaphragm shaft of second pressure adjusting means 2 Diaphragm of second pressure adjusting means 26 Upper chamber of diaphragm of second pressure adjusting means 27 Gas shut-off valve inside gas meter 28 High pressure hose 29 High pressure hose 30 Automatic switching regulator 31 Sealing member 32 Inlet side passage 33 Outlet side passage 34 Low pressure pipe 35 Outlet pressure introduction passage 36 Valve guide 37 Communication passage with automatic switching regulator 38 Vent of second pressure regulation means

Claims (1)

(57) [Claims] 1. A gas meter 15 having a built-in shut-off valve 27.
The first pressure adjusting means 1 is disposed upstream of the pressure meter, and the pressure near the gas meter inlet is introduced into the diaphragm lower chamber 17.
Disposed downstream of the gas meter 15, the pressure near the gas meter outlet is introduced into the diaphragm lower chamber 6,
A second pressure adjusting means 2 in which the diaphragm upper chamber 26 communicates with the atmospheric pressure through a vent 38; a first pressure adjusting means 1
And the diaphragm shaft 23 of the second pressure adjusting means 2 are inserted and communicate with the diaphragm lower chamber 17 of the first pressure adjusting means 1 while shutting off the diaphragm lower chamber 6 of the second pressure adjusting means 2. A hollow body 13; a valve body 4 arranged in the hollow space 13 so as to face the nozzle 3 and adjusting the flow rate of gas from the liquefied gas container 14; a passive arm arranged in the hollow space 13 The portion 10a engages with the driving portion 20 of the diaphragm shaft 19 of the first pressure adjusting means 1, the operating arm portion 10b abuts on the valve body 4, and adjusts the opening of the valve body 4 in conjunction with the movement of the diaphragm 21. A first operating lever 10 to be operated; and a passive arm 11a disposed in the hollow portion 13 and engaged with a driving portion 24 of a diaphragm shaft 23 of the second pressure adjusting means 2, and 1b abuts on the valve body 4 and adjusts the opening of the valve body 4 in conjunction with the movement of the diaphragm 25; and is disposed in the upper diaphragm chamber 26 of the second pressure adjusting means 2 to reduce gas consumption. A pressure adjusting spring 9 set at a predetermined load for the purpose of controlling the gas supplied to the device 16 by the pressure after passing through the gas meter;
A pressure adjusting spring 8 disposed in the upper diaphragm chamber 5 of the first pressure adjusting means 1 and set to have a load substantially corresponding to the maximum pressure resistance value generated when the gas having the indicated volume of the gas meter passes through the inside of the gas meter; A valve body lifting spring 12 is disposed in the cavity 13 and acts in a direction to separate the valve body 4 from the nozzle 3. The diaphragm lower chamber 6 of the second pressure adjusting means 2 and the upper part of the diaphragm of the first pressure adjusting means 1. The chamber 5 is communicated by the passage 7 so that the first operating lever 10 moves in the valve closing direction following the movement of the diaphragm 21 but does not move effectively in the valve opening direction.
The driving portion 20 of the diaphragm shaft 19 of the first pressure adjusting means 1 is engaged with the passive arm portion 10a of the first operating lever 10 with a play interval, and the second operating lever 11 follows the movement of the diaphragm 25. The drive unit 24 of the diaphragm shaft 23 of the second pressure adjusting means 2 and the passive arm unit 11a of the second operation lever 10 are provided with a play interval so that the movable unit moves in the valve closing direction but does not move effectively in the valve opening direction. A gas pressure regulator on the gas meter outlet side, which is engaged with the gas pressure regulator.