JP2009245112A - Pressure-governing facility system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure-governing facility system that can be installed easily in existing pressure-governing facility and can interrupt supply of gas without fail, during earthquake. <P>SOLUTION: In an unloading type pressure governing facility, having a primary pressure governing facility 3 and a pilot pressure governing valve 13 and operated, by eliminating the gas pressure inside the primary pressure governing facility 3, the pressure governing facility system is equipped with an operation valve 15, arranged in a second pilot path 11 connecting the primary pressure governing facility 3 and the pilot pressure-governing valve 13, an earthquake sensor 19 for transmitting a sensed signal, when the earthquake is sensed, and a control device 17 for inputting the sensed signal transmitted by the earthquake sensor 19 and closing the operation valve 15, when the sensed signal is determined as exceeding the value set up, in advance. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention provides a pressure regulator that is provided in a pipeline system of, for example, city gas, etc., and reduces a primary side fluid pressure to a secondary side fluid pressure to suppress a change in secondary side pressure with respect to a flow rate change. About the system.

In the piping system that supplies city gas, a pressure regulator is installed at a location where the gas pressure is reduced from the primary side, which is the high pressure side, to the secondary side, which is the low pressure side, in order to supply the gas pressure in multiple stages. . Such a pressure regulator is also referred to as a governor, and includes a mechanism that automatically adjusts the opening of the valve so that the pressure fluctuation on the secondary side becomes small even when the gas flow rate fluctuates.
An emergency shut-off valve that shuts off the flow path for emergency is provided upstream of such a pressure regulator. In the event of an earthquake, humans confirm the magnitude of the earthquake and perform emergency shut-off by manual operation on site. The valve is closed (see, for example, FIG. 3 of Patent Document 1).
JP 2008-39062 A

As described above, an emergency shut-off valve is provided on the upstream side of the pressure regulator. However, in principle, an emergency operation such as an earthquake is performed by a person on site.
Of course, some high-pressure governor stations use an emergency shut-off valve on the upstream side as a remote control valve to enable remote shut-off operation in the event of an earthquake. The current situation is that it is not widely used in medium pressure regulators, which occupies the majority.

Many of the pressure regulators are housed in a compact box, and there is no space for installing a new remote-controlled emergency shut-off valve.
Under such circumstances, there is a problem in that if the downstream conduit of the pressure regulator is damaged by an earthquake and the pressure is lowered, more gas is supplied downstream than the pressure regulator mechanism, which is dangerous.

  The present invention has been made to solve such problems, and provides a pressure regulator system that can be easily installed on an existing pressure regulator and can reliably stop the supply of gas during an earthquake. The purpose is that.

(1) A pressure regulator system according to the present invention includes a main pressure regulator and a pilot pressure regulation valve, and is an unloading type pressure regulator that is operated by extracting gas pressure in the main pressure regulator. An operation valve provided in the pilot path connecting the pressure regulating valve, an earthquake detector that transmits a detection signal when an earthquake is detected, and a detection signal that is transmitted from the earthquake detector are input, and the detection signal is preset. And a control device that closes the operation valve when it is determined that the measured value is exceeded.

(2) A loading type pressure regulator having a main pressure regulator and a pilot pressure regulation valve, which is operated by introducing gas pressure into the main pressure regulator, provided in a pilot path connecting the upstream side and the pilot pressure regulation valve. And a seismic sensor that transmits a sensing signal when an earthquake is detected, and a sensing signal that is transmitted by the seismic sensor, and determines that the sensing signal exceeds a preset value. And a control device for closing the operation valve when the operation is performed.

(3) Further, in the above-described (1) or (2), an opening detector for detecting the opening of the pressure regulator is provided, and the control device includes an opening signal and a sensing signal of the opening detector. The operation valve is controlled based on

(4) Further, in any of the above (1) to (3), the downstream side flow path has a flow rate detector for detecting a flow rate, and the control device has an opening degree signal of the opening degree detector. The control valve is controlled based on the detection signal.

(5) Further, in any of the above (1) to (4), the control device further includes a remote monitoring device that transmits a signal that instructs the control device to open and close the operation valve. The operation valve is controlled based on a signal from the monitoring device.

  In the present invention, in an unloading type pressure regulator that has a main pressure regulator and a pilot pressure regulation valve and is operated by extracting gas pressure in the main pressure regulator, the pilot pressure path is connected to the main pressure regulator and the pilot pressure regulation valve. When an operation valve provided, an earthquake sensor that transmits a detection signal when an earthquake is detected, and a detection signal that is transmitted by the earthquake sensor are input, the detection signal exceeds a preset value. And a control device that closes the operation valve when it is judged, so that if the magnitude of the earthquake exceeds a predetermined scale at the time of the earthquake, the pressure regulator is automatically closed. Even when the downstream gas conduit is damaged, the gas regulator does not flow downstream by closing the pressure regulator, and gas leakage can be reliably prevented.

[Embodiment 1]
FIG. 1 is an explanatory diagram of a pressure regulator system according to an embodiment of the present invention. The example shown in FIG. 1 uses an unloading type pressure regulator that is operated by releasing the pressure of the gas in the pressure regulator.
The pressure regulator system according to the present embodiment includes a main pressure regulator 3 installed in the gas conduit 1, a pressure sensing chamber 5 of the main pressure regulator 3, and a primary side 1a (upstream side) of the gas conduit 1. A restrictor 9 installed in the pilot path 7, a pilot pressure regulating valve 13 installed in the second pilot path 11 connecting the pressure sensing chamber 5 and the secondary side 1b (downstream side) of the gas conduit 1, and a second pilot path 11, a control device 17 that outputs a control signal for operating the control valve 15, an earthquake detector 19 that outputs an earthquake detection signal to the control device 17, a remote monitoring device 21, And a communication unit 23 that receives a signal transmitted from the monitoring device 21 and outputs the signal to the control device 17.
As shown in FIG. 1, the first pilot path 7 and the second pilot path 11 merge in the middle and are connected to the pressure sensing chamber 5 of the main pressure regulator 3.
The main components among the components will be described in more detail.

<Operating valve>
The operation valve 15 is installed in the second pilot path 11 that connects the pressure sensing chamber 5 and the secondary side 1b (downstream side) of the gas conduit 1, and opens and closes the second pilot path 11.
The opening / closing operation is performed based on a control signal output from the control device 17.

<Control device>
The control device 17 inputs a detection signal from the seismic detector 19 and determines whether or not the detection signal is larger than a preset value. If the detection signal is larger, the control device 17 gives a signal for closing the valve to the operation valve 15. Output. The preset value in the sensing signal is the value of the sensing signal corresponding to the magnitude of the earthquake set in advance assuming that the gas conduit 1 is expected to be damaged.
In addition, the control device 17 transmits a detection signal input from the earthquake detector 19, a signal indicating the open / close state of the operation valve 15, and the like to the remote monitoring device 21 via the communication unit 23.
Furthermore, the control device 17 inputs a signal transmitted from the remote monitoring device 21 via the communication means 23 and outputs a control signal to the operation valve 15 based on the signal.

<Remote monitoring device>
The remote monitoring device 21 receives the detection signal of the earthquake detector 19 and the signal indicating the open / closed state of the operation valve 15 transmitted via the communication means 23 and displays them on the monitor.
Further, the remote monitoring device 21 transmits an operation signal of the operation valve 15 to the communication means 23.
The remote monitoring device 21 is usually provided in a monitoring room located away from the governor station, and can be monitored by a monitor by displaying information on a monitor or the like.

The operation of the present embodiment configured as described above will be described.
First, the basic operation of the unloading type according to the present embodiment will be described in a normal state where no earthquake has occurred. In this normal state, the operation valve 15 is open.

<Opening action>
When the secondary pressure P2 falls below the set pressure of the pilot pressure regulating valve 13, the pilot pressure regulating valve 13 is opened, and gas flows through the second pilot path 11 toward the secondary side 1b. The change in the flow rate due to the gas flowing through the second pilot path 11 is replaced by the change in the control pressure Pc by the restrictor, and the control pressure Pc is lowered. When the control pressure Pc is reduced, the shut-off force, which is the combined force of the tension of the sleeve 25 and the control pressure Pc, becomes smaller than the primary pressure P1, so that the sleeve 25 is expanded and gas is discharged from the gap between the closure 27 and the sleeve 25. Flowing.

<Closed action>
When the pressure P2 on the secondary side 1b becomes higher than the set pressure of the pilot pressure regulating valve 13, the pilot pressure regulating valve 13 is closed, the control pressure Pc is increased, and the cutoff pressure becomes the same as the primary pressure P1, and the downstream side The sleeve 25 is pressed against the closure 27 to be in a completely closed state.

  As described above, the unloading type pressure regulator is based on the system in which the main pressure regulator 3 is opened by releasing the pressure in the pressure sensing chamber 5, and the pilot pressure regulator is associated with the pressure fluctuation on the secondary side 1b. By opening and closing 13, the opening of the main pressure regulator 3 is adjusted to operate so as to keep the pressure on the secondary side 1b constant.

Next, operation during an earthquake will be described.
When an earthquake occurs, a detection signal from the earthquake detector 19 is input to the control device 17. When a sensing signal is input, the control device 17 determines whether the signal exceeds a preset value. And when exceeding, the closing signal is output with respect to the operating valve 15, and the operating valve 15 is closed by this. When the operation valve 15 is closed, the main pressure regulator 3 is completely closed in a manner similar to the state in which the pilot pressure regulator 13 is closed.

In this way, when the magnitude of the earthquake exceeds the predetermined scale at the time of the earthquake, the pressure regulator is automatically closed, so that the gas conduit 1 on the downstream side is temporarily damaged. However, since the pressure regulator is closed, gas does not flow downstream, and gas leakage can be prevented.
In addition, since a simple modification of adding the operation valve 15 to the second pilot path 11 with respect to the existing equipment is sufficient, the equipment cost required for the modification can be reduced.

Further, the occurrence of an earthquake at the place where the pressure regulator is installed is transmitted to the remote monitoring device 21 via the communication means 23, and the opening / closing status of the operation valve 15 is also transmitted at the same time. The open / close state of the operation valve 15 can be grasped at the place where the device 21 is installed.
Even if the operation valve 15 is automatically closed as described above, if it can be confirmed that there is no damage on the downstream side of the gas conduit 1, a signal for opening the operation valve 15 is transmitted from the remote monitoring device 21. In this case, the control device 17 can receive this to open the operation valve 15 and can be easily restored to the normal operating state.

[Embodiment 2]
FIG. 2 is an explanatory diagram of a pressure regulator system according to Embodiment 2 of the present invention. Similarly to the first embodiment, the pressure regulator system according to the present embodiment uses an unloading type pressure regulator, and the same part as or corresponding part to FIG. The same reference numerals are given, and description thereof will be omitted.
The main valve of the main pressure regulator 3 of the pressure regulator system according to the present embodiment includes a diaphragm 28a, a diaphragm support 28b that holds the diaphragm 28a, and a diaphragm spring 28c that urges the diaphragm 28a in the closing direction. Has been.

In the present embodiment, the main pressure regulator 3 is provided with an opening degree meter 29, and an opening degree detector 31 that detects the opening state of the open clock and transmits it to the control device 33 as an opening degree signal. .
And the control apparatus 33 which concerns on this Embodiment inputs the opening degree signal of the opening degree detector 31, and operates the operation valve 15 based on this opening degree signal and the sensing signal of the earthquake detector 19. FIG.
Hereinafter, the operation during normal times and during earthquakes will be specifically described.

<Normal time>
During normal operation, the opening signal of the opening detector 31 is input to the control device 33, and the opening signal is transmitted to the remote monitoring device 21 via the communication means 23.
The remote monitoring device 21 receives the opening signal and displays the opening state of the pressure regulator on a monitor or the like. Thereby, the monitor can always grasp the operation state of the pressure regulator at the place where the remote monitoring device 21 is set.
If the opening signal indicates an abnormal value, the monitor inputs a signal for closing the operation valve 15 to the remote monitoring device 21. By inputting this signal to the control device 33 via the communication means 23, the pressure regulator can be closed.
The case where the opening signal indicates an abnormal value is, for example, a case where the opening of the pressure regulator changes suddenly, or a case where the pressure regulator is fully opened and the state continues for a predetermined time or longer ( The same applies below).

<At the time of earthquake>
When an earthquake occurs, the detection signal of the earthquake detector 19 is input to the control device 33, and when the detection signal is input, the control device 33 sets the value set in advance in the same manner as in the first embodiment. Determine if it has exceeded.
When the sensing signal exceeds a predetermined value, it is further determined whether or not the opening signal indicates an abnormal value. When the opening signal indicates an abnormal value, the operation valve 15 is Then, a closing signal is output, and the operation valve 15 is thereby closed. When the operation valve 15 is closed, the operation is similar to the state in which the pilot pressure regulating valve 13 is closed, and the pressure regulator is completely closed.

  Thus, in the present embodiment, when the magnitude of the earthquake exceeds a predetermined scale at the time of the earthquake, it is further determined whether or not the pressure regulator is closed after further grasping the opening state of the pressure regulator. As a result, the pressure regulator can be closed only when it is damaged during an earthquake, and proper operation becomes possible.

[Embodiment 3]
FIG. 3 is an explanatory diagram of the pressure regulator system according to the third embodiment of the present invention. The pressure regulator system according to the present embodiment uses a loading type pressure regulator.
The pressure regulator system according to the present embodiment is provided in a main pressure regulator 41 installed in the gas conduit 1 and a pressure sensing chamber 43 of the main pressure regulator 41 so as to divide the pressure sensing chamber 43 into upper and lower parts. A first pilot path 49 in which one end side communicates with the primary side 1a (upstream side) of the gas conduit 1 and the other end side is connected to the pilot pressure regulating valve 47, and one end side is the secondary side 1b of the gas conduit 1. A second pilot path 51 connected to the (downstream side) and connected to the pilot pressure regulating valve 47 at the other end, and a first connected to the pilot pressure regulating valve 47 at one end and the lower side of the pressure sensing chamber 43 at the other end. A gas introduction path 53; a second gas introduction path 55 having one end connected to the pilot pressure regulating valve 47 and the other end communicating to the upper side of the pressure sensing chamber 43; an operation valve 15 installed in the first pilot path 49; Operate valve 15 A control device 57 that outputs a control signal to be generated, an earthquake detector 19 that outputs an earthquake detection signal to the control device 57, a remote monitoring device 21, and a control device that receives a signal transmitted from the remote monitoring device 21 And a flow rate detector 59 that is provided in the downstream gas conduit 1 and detects the gas flow rate and outputs it to the control device 57.

  Among the components, the gas conduit 1, the primary side 1a, the secondary side 1b, the operation valve 15, the earthquake detector 19, the communication means 23, and the remote monitoring device 21 are the same as those in the first and second embodiments. Since the opening detector 31 is the same as that of the second embodiment, the same reference numerals as those used in the first and second embodiments are used, and the description thereof is omitted. Will be described in detail.

<Control device>
The control device 57 receives a detection signal from the earthquake detector 19, an opening signal from the opening detector 31, and a flow signal from the flow detector 59.
And the control apparatus 57 will judge whether the said detection signal is larger than the preset value, if the detection signal from the earthquake detector 19 is input. When the sensing signal is larger than a preset value, it is determined whether the opening signal of the opening detector 31 is abnormal and whether the flow signal of the flow detector 59 is abnormal. When the degree signal is abnormal or when the flow rate signal of the flow rate detector 59 is abnormal, a signal for closing the valve is output to the operation valve 15.
The case where there is an abnormality in the flow rate signal is, for example, a case where the flow rate suddenly increases or a case where a flow rate equal to or higher than a predetermined flow rate continues for a predetermined time.

Further, the control device 57 detects the detection signal input from the seismic detector 19, the signal indicating the open / close state of the operation valve 15, the opening signal input from the opening detector 31, and the flow rate input from the flow detector 59. A signal or the like is transmitted to the remote monitoring device 21 via the communication means 23.
Further, the control device 57 inputs a signal transmitted from the remote monitoring device 21 via the communication means 23 and outputs a control signal to the operation valve 15 based on the signal.

The operation of the present embodiment configured as described above will be described.
First, a basic operation of the loading type according to the present embodiment will be described in a normal state where no earthquake has occurred. In this normal state, the operation valve 15 is open.

<Opening action>
When the downstream secondary pressure is lower than the set pressure of the pilot pressure regulating valve 47, gas flows from the pilot pressure regulating valve 47 side to the first introduction path, and the loading pressure applied to the lower side of the diaphragm 45 is reduced by the actuator spring 61. When the pressure on the upper side of the diaphragm 45 becomes larger, the diaphragm 45 moves upward to open the valve plug 63, and the pressure regulator is opened.

<Closed action>
When the downstream pressure rises and exceeds the set value of the pilot pressure regulating valve 47, the flow of gas from the pilot pressure regulating valve 47 side to the first introduction path is stopped, and an excessive loading pressure applied to the lower side of the diaphragm 45 causes a restrictor. 64 is discharged downstream. As a result, the loading pressure applied to the lower side of the diaphragm 45 is lowered, and the actuator spring 61 pushes up the main valve plug 63 to be closed, thereby reducing the downstream flow.

  As described above, the loading type pressure regulator is based on a system in which the main pressure regulator 41 is opened by introducing pressure into the lower side of the pressure sensing chamber 43, and accompanying the pressure fluctuation on the secondary side 1b. By opening and closing the pilot pressure regulating valve 47, the opening of the main pressure regulator 41 is adjusted, and the pressure on the secondary side 1b is kept constant.

Next, the normal operation and the earthquake operation of the present embodiment configured as described above will be described.
<Normal time>
During normal operation, the opening signal of the opening detector 31 and the flow signal of the flow detector 59 are input to the control device 57, and the opening signal is transmitted to the remote monitoring device 21 via the communication means 23. The
The remote monitoring device 21 receives the opening degree signal and the flow rate signal and displays the opening degree state and the flow rate state of the pressure regulator on a monitor or the like. Thereby, the monitor can always grasp the operation state of the pressure regulator at the place where the remote monitoring device 21 is set.
If the opening signal indicates an abnormal value or the flow signal indicates an abnormal value, the monitor inputs a signal for closing the operation valve 15 to the remote monitoring device 21. By inputting this signal to the control device 57 via the communication means 23, the pressure regulator can be closed.

<At the time of earthquake>
When an earthquake occurs, the detection signal of the earthquake detector 19 is input to the control device 57, and when the detection signal is input, the control device 57 sets the preset value as in the case of the first embodiment. Determine if it has exceeded.
When the sensing signal exceeds a predetermined value, it is further determined whether the opening signal indicates an abnormal value and whether the flow signal indicates an abnormal value. If any of them indicates an abnormal value, a closing signal is output to the operation valve 15, thereby closing the operation valve 15. When the operation valve 15 is closed, the operation is similar to the state in which the pilot pressure regulator 47 is closed, and the pressure regulator is completely closed.

As described above, in the present embodiment, when the magnitude of the earthquake exceeds a predetermined scale at the time of the earthquake, the opening condition and the flow condition of the pressure regulator are further grasped, and if any of them is abnormal Since the pressure regulator is closed, the pressure regulator can be reliably closed in the event of an earthquake even if there is a failure in the opening detector 31 or the flow rate detector 59, so that the reliability is high.
However, instead of the above operation, the operation valve 15 may be closed when both the opening degree signal and the flow rate signal are abnormal values during an earthquake, and these can be changed as appropriate.

  In the third embodiment, an example in which both the opening degree detector 31 and the flow rate detector 59 are provided has been described. However, only the flow rate detector 59 is provided, and the seismic detector sense signal and the flow rate during an earthquake are provided. Control based on the flow rate signal of the detector 59 may be performed.

It is explanatory drawing of the pressure regulator system which concerns on Embodiment 1 of this invention. It is explanatory drawing of the pressure regulator system which concerns on Embodiment 2 of this invention. It is explanatory drawing of the pressure regulator system which concerns on Embodiment 3 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gas conduit 3 Main pressure regulator 5 Pressure sensing chamber 7 1st pilot path 9 Restrictor 11 2nd pilot path 13 Pilot pressure regulation valve 15 Operation valve 17 Control apparatus 19 Seismic detector 21 Remote monitoring apparatus 23 Communication means 25 Sleeve 27 Closure 28a Diaphragm 28b Diaphragm support 28c Diaphragm spring 29 Opening meter 31 Opening detector 33 Controller 41 Main pressure regulator 43 Pressure sensing chamber 45 Diaphragm 47 Pilot pressure regulator 49 First pilot path 51 Second pilot path 53 First gas introduction path 55 Second gas introduction path 57 Controller 59 Flow rate detector 61 Actuator spring 63 Valve plug 64 Restrictor

Claims (5)

In the unloading type pressure regulator, which has a main pressure regulator and a pilot pressure regulation valve, and is operated by releasing the gas pressure in the main pressure regulator,
The operation valve provided in the pilot path connecting the main pressure regulator and the pilot pressure regulator, the seismic sensor that transmits a sensing signal when an earthquake is detected, and the sensing signal that the seismic sensor transmits are input and the sensing A pressure regulator system comprising: a control device that closes the operation valve when it is determined that the signal exceeds a preset value. In a loading type pressure regulator which has a main pressure regulator and a pilot pressure regulation valve and is operated by introducing a gas pressure into the main pressure regulator,
An operation valve provided in a pilot path connecting the upstream side and the pilot pressure regulating valve, an earthquake detector that transmits a detection signal when an earthquake is detected, and a detection signal transmitted by the earthquake detector are input, and the detection signal And a controller for closing the operation valve when it is determined that the value exceeds a preset value. 2. An opening detector for detecting an opening of the pressure regulator, and the control device controls the operation valve based on an opening signal and a sensing signal of the opening detector. 2. The pressure regulator system according to 2. 2. A flow rate detector for detecting a flow rate in a downstream flow path, wherein the control device controls the operation valve based on an opening degree signal and a sensing signal of the opening degree detector. 4. The pressure regulator system according to any one of 3 above. 2. A remote monitoring device that transmits a signal that instructs the control device to open and close the operation valve, and the control device controls the operation valve based on a signal from the remote monitoring device. 5. The pressure regulator system according to any one of 4 above.

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