KR101212075B1 - Slam shut-off system for gas pressure regulating device - Google Patents

Abstract

The present invention is configured to shut off with a solenoid valve when the normal gas supply pressure, and when the excessive pressure occurs in the supply line of the rear end of the constant pressure, open the solenoid valve to automatically enter the gas supply pressure into the emergency shutoff valve, digital operation By using this method, it is possible to improve the work efficiency of workers, to set more precise shutoff pressure, and to ensure the reliability of gas shutoff operation, and thus to provide high quality service to the stability of gas supply facilities and customers. To provide an emergency shutoff device for a pressure regulator.

Description

Slam shut-off system for gas pressure regulating device

The present invention relates to a constant pressure emergency shutoff device for shutting off the gas supply line when the gas supply pressure rises above a certain level.

Slam Shut-Off Valve (SSV) in the static pressure facility is a gas supply safety system that automatically shuts off when the supply pressure rises due to abnormality in the constant pressure or external factors.

In other words, the emergency shut-off valve is a valve device that automatically blocks the flow of the primary side when the secondary side pressure, such as gas demand destination rises, to prevent the secondary side pressure rises above the set value. It consists of a mechanical (Analog) mode of operation which is driven by the difference between the press pressure and the lower supply pressure.

With reference to Figures 1 to 3 will be described with respect to the emergency shut-off valve of the conventional static pressure facility.

In FIG. 1, reference numeral 10 denotes a gas supply line.

An emergency shut-off valve 20 which cuts off the gas supply line 10 when the pressure rises excessively on the secondary supply line (hereinafter, also referred to as 'rear side supply line') 11 on the gas supply line 10. ), A regulator 30 for supplying the gas under reduced pressure, and the like are provided.

In FIG. 1, reference numeral 15 denotes a sensing line for operating the emergency shutoff valve 20 by introducing a pressure of the rear end supply line 11 into the emergency shutoff valve 20.

Now, with reference to Figures 2 and 3, the emergency shut-off valve 20 will be described.

The emergency shutoff valve 20 is in a state in which the valve is open as shown in FIG. 2 during normal gas supply, and as shown in FIG. 3 when the pressure of the rear end supply line 11 rises above the set pressure. Is configured to shut off the gas supply while closing.

That is, referring to FIG. 2, when the pressure of the rear end supply line 11 connected to the rear end customer side of the constant pressure is less than the set pressure, the supply pressure through the sensing line 15 in the rear end supply line 11 (see FIG. 1). Since the pressing pressure of the shutoff pressure setting spring 21 is greater than the pressure transmitted to the drive unit 23, the supply shutoff valve 25 is in a state of being caught by the shutoff valve shaft 26, and the valve open state. Is maintained so that the gas is supplied normally.

In such a normal gas supply state, referring to FIG. 3, the pressure of the rear end supply line 11 (see FIG. 1) is urgently cut off due to an abnormality in the constant pressure regulator itself or a large-scale power failure. When the operating pressure of the valve 20 is reached, the shutoff pressure is transmitted to the supply pressure drive unit 23 through the sensing line 15 to push up the diaphragm 27, and the blocking pressure setting spring 21 acting on the contrary. At the moment when the balance of the force with the pressing pressure of) is broken (when the supply pressure is greater than the spring pressure), the diaphragm 27 rises upward. The shutoff valve 25 rotates to cut off the gas line.

However, the conventional emergency shut-off system including the emergency shut-off valve as described above sets the breaking pressure by using the elastic force of the spring 21 for setting the breaking pressure, so it is not easy to set the breaking pressure and to ensure the reliability of the accurate breaking operation. There is a difficult problem.

In addition, the prior art requires a periodic reset and inspection work, there is a problem that the work efficiency is lowered because a considerable time is required during the reset work.

In addition, in the related art, since the breaking pressure is set in dependence on the spring 21 for setting the breaking pressure, when the self defect of the spring occurs due to a decrease in elastic force or corrosion during long-term use, the need for frequent replacement and repair is also required. have.

In addition, conventionally, only the emergency shutoff valve is configured to stop the gas supply when an abnormal pressure occurs in a mechanical manner, so in an emergency situation such as a fire or a gas leakage accident, the operator goes to the site and manually operates the emergency shutoff valve. There is a problem that the gas supply must be stopped.

The contents of the background art described above are technical information that the inventor of the present application holds for the derivation of the present invention or acquired in the derivation process of the present invention and is a known technology disclosed to the general public prior to the filing of the present invention I can not.

The present invention has been made in order to solve the above problems, the normal supply pressure is cut off by the solenoid valve, the solenoid valve is opened only when the shutoff pressure is higher than the emergency shutoff valve is configured to operate more accurate cutoff pressure and In addition, it is an object of the present invention to increase the reliability of the gas shutoff in the event of an abnormality, and to provide a pressure regulator emergency shut-off device that can enhance the stability of the supply facilities and services to the demand destination.

In another aspect, the present invention provides a pressure regulator emergency shut-off device that can be remotely controlled in an emergency situation by providing a remote shut-off function for the emergency shut-off valve of the site pressure regulator in the situation control room. There is a purpose.

According to an aspect of the present invention, there is provided a hydrostatic emergency shutoff device including: an emergency shutoff valve installed on a gas supply line to block a gas supply line when a pressure on a rear end supply line is greater than or equal to a set pressure; A sensing line connected to the inside of the emergency shutoff valve in the rear supply line and providing a gas pressure in a rear supply line; A pressure measuring mechanism installed on the rear end supply line to measure a gas supply pressure; A solenoid valve installed on the sensing line to open and close the sensing line; When the gas pressure on the rear-side supply line is less than the set pressure by receiving the detection result of the pressure measuring device, the solenoid valve is controlled to cut off the sensing line. When the gas pressure on the rear-side supply line is above the set pressure, the solenoid It characterized in that it comprises a control unit for controlling the valve to open the sensing line to allow gas pressure to flow into the emergency shutoff valve.

Here, a preliminary sensing line connected to bypass the solenoid valve may be provided on the sensing line.

The solenoid valve disconnects the line connected to the rear end supply line when the sensing line is shut off, connects the line connected to the emergency shutoff valve with the atmospheric pressure vent port, and shuts off the atmospheric pressure vent port when the sensing line is opened, and is connected with the rear end supply line. It is preferable to be configured to connect the line and the line connected to the emergency shutoff valve.

The control unit is preferably configured to include a delay means for delaying for a predetermined time when opening the sensing line by controlling the solenoid valve when the gas pressure on the rear end supply line is more than the set pressure.

The pressure measuring device may be a pressure switch that outputs an open signal of the sensing line when the gas pressure is equal to or greater than a set pressure.

In addition, the pressure measuring mechanism is composed of a pressure transmitter for measuring the gas supply pressure, the solenoid valve is input by a signal of the digital relay for receiving a signal of the pressure transmitter and outputting a control signal when the gas pressure is above the set pressure It can be configured to work.

The control unit may be configured to include a situation control room capable of remote control.

The main problem solving means of the present invention as described above, will be described in more detail and clearly through examples such as 'details for the implementation of the invention', or the accompanying 'drawings' to be described below, wherein In addition to the main problem solving means as described above, various problem solving means according to the present invention will be further presented and described.

The constant pressure emergency shutoff device according to the present invention is configured such that the normal supply pressure is blocked by the solenoid valve, and when the excessive pressure occurs in the supply line at the rear end of the constant pressure, the solenoid valve is opened so that the supply pressure can be automatically introduced into the emergency shutoff valve. Therefore, the digital operation method can be used to improve the operator's work efficiency, to set the cutoff pressure more accurately, and to ensure the reliability of the gas shutoff operation. There is an effect that can provide.

In addition, the present invention, when configured to control the operation of the emergency shutoff valve in the remote situation control room has the effect that it is possible to control the situation more appropriately by remote control in the event of an emergency such as a fire, gas leakage accident.

1 is a block diagram of a conventional emergency shutoff system including an emergency shutoff valve.
2 and 3 are views showing the configuration of the emergency shutoff valve, Figure 2 is a cross-sectional view of the valve open state, Figure 3 is a cross-sectional view of the valve closed state.
4 is a configuration diagram of an embodiment in which the emergency shutoff device according to the present invention is shown.
5 and 6 are views showing one embodiment of the solenoid valve used in the present invention, Figure 5 is a sectional view of the solenoid valve closed state, Figure 6 is a sectional view of the solenoid valve open state.
7 is a configuration diagram of another embodiment in which the emergency pressure emergency shutoff device according to the present invention is shown.
8 is a configuration diagram of an embodiment in which the control circuit system of the constant pressure emergency shutoff apparatus according to the present invention is shown.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

Figure 4 is a block diagram showing an embodiment of a constant pressure emergency shutoff device according to the present invention, Figures 5 and 6 are views showing an embodiment of a solenoid valve used in the present invention.

Referring to FIG. 4, the emergency shutoff valve 52, the regulator 54, the pressure switch 73, and the pressure transmitter 71 are sequentially installed on the gas supply line 50.

Here, the emergency shutoff valve 52 is configured to block the gas supply line 50 when the pressure on the rear end supply line 55 that is the secondary gas supply line is equal to or higher than the set pressure.

Since the emergency shutoff valve 52 may use an emergency shutoff valve of the type as illustrated in FIGS. 2 and 3, a detailed description of the valve configuration is omitted. In addition, as long as the gas pressure of the rear end supply line 55 is introduced to block the gas supply line 50, it is also possible to apply other known emergency shutoff valves.

The regulator 54 is configured to supply the gas supplied on the rear end supply line 55 under reduced pressure, and may be configured by selecting one of various well-known regulators 54 according to an implementation condition.

The pressure transmitter 71 and the pressure switch 73 constitute a pressure measuring mechanism for measuring the gas supply pressure of the rear end supply line 55 in the present invention.

The pressure transmitter 71 measures the gas pressure and transmits an electric signal to the system control unit (or the situation control room 91). The pressure switch 73 opens and closes the electrical contact when the gas pressure reaches a set value. It is a mechanism for generating a signal.

4 illustrates a configuration in which both the pressure transmitter 71 and the pressure switch 73 are provided, and in the embodiment illustrated in FIG. 7, the configuration in which only the pressure transmitter 71 is provided. . Of course, although not illustrated in the drawings, only the pressure switch 73 may be installed and configured.

The control system using the pressure transmitter 71 and the pressure switch 73 will be described in detail later.

In the present invention is provided with a sensing line 60 is connected to the inside of the emergency shutoff valve 52 in the rear end supply line 55 to provide a gas pressure of the rear end supply line 55. At this time, the sensing line 60 is composed of a conventional pipe through which gas can pass.

On the sensing line 60, a preliminary sensing line 65 connected to bypass the solenoid valve 80 to be described later may be provided. The preliminary sensing line 65 is not necessarily a configuration, and is preliminarily installed in case the solenoid valve 80 breaks down. Of course, the preliminary sensing line 65 is preferably configured to block the sensing line 60 by providing an opening and closing valve 66 at its inlet and outlet.

On the sensing line 60, a solenoid valve 80 for opening and closing the sensing line is installed.

The solenoid valve 80 cuts off the line connected to the rear end supply line 55 when the sensing line 60 is blocked, opens the line connected to the emergency shutoff valve 52 under atmospheric pressure, and opens the sensing line 60. At the time, the atmospheric pressure inflow is blocked, it is preferable to be configured to open by connecting the line connected to the rear end supply line 55 and the line connected to the emergency shut-off valve 52.

That is, referring to FIGS. 5 and 6, the solenoid valve 80 includes a line body 81 connected between the sensing lines 60, a valve body 82 coupled to the line body 81, and a valve. The solenoid 83 provided inside the body 82 and the valve stem 85 which linearly move by this solenoid 83 are comprised.

The line body 81 has a first communication port 86 connected to the rear end supply line 55 and a second communication port 87 connected to the emergency shutoff valve 52, respectively, to form an inner side of the valve body 82. Is connected.

The valve body 82 is connected to the vent port 88 in communication with the atmospheric pressure space on the opposite side of the portion connecting the first communication port 86 and the second communication port 87.

The solenoid valve 80 configured as described above, when the sensing line 60 is blocked, the valve stem 85 is lowered (in the drawing), and the first communication port 86 is blocked, and the second communication port 87 is connected to the solenoid valve 80. The vent holes 88 are open to each other, and when the sensing line 60 is opened, the vent holes 88 are lifted (in the drawing) to block the vent holes 88, and the first communication holes 86 and the second communication holes 87 are mutually open. It is configured to be open so that the gas pressure of the rear end supply line 55 can be supplied into the emergency shutoff valve 52.

In the above, the solenoid valve 80 is configured as a three-way valve including a vent port 88, but the present invention is not limited thereto, and the solenoid valve 80 may be configured using a two-way valve without the vent port 88.

Meanwhile, in the present invention, the control unit 90 is included to control the system of the present invention.

The control unit 90 receives the detection result of the pressure measuring device and, when the gas pressure on the rear end supply line 55 is less than the set pressure, controls the solenoid valve 80 to block the sensing line 60 and the rear end. When the gas pressure on the side supply line 55 is above the set pressure, the solenoid valve 80 is controlled to open the sensing line 60 to control the inflow of gas pressure into the emergency shutoff valve 52. do.

In addition, the control unit 90 controls the solenoid valve 80 to open the sensing line 60 when the gas pressure on the rear end supply line 55 is greater than or equal to a set pressure, and delays the delay unit for a predetermined time ( 95) can be included.

The configuration of the control unit 90 can be largely configured in two ways.

In the first manner, as illustrated in FIG. 4, both the pressure transmitter 71 and the pressure switch 73 may be provided to control the solenoid valve 80.

When a signal of a predetermined pressure or more occurs in the pressure switch 73, it is directly input to the solenoid valve 80 via the time relay 94 and configured to open the solenoid valve 80.

At this time, it is also possible to further configure a separate control unit for receiving the signal of the pressure switch 73 and outputting a control signal to the solenoid valve 80 or the time relay 94.

Here, the time relay 94 is a main component of the delay means 95 according to the present invention, and the gas pressure of the rear end supply line 55 sensed by the pressure switch 73 is greater than or equal to a set pressure. If so, it is configured to control to open the solenoid valve 80 only if this pressure lasts for a certain time or more.

This is installed so that the emergency shut-off valve 52 does not operate when the pressure of the rear end supply line 55 suddenly rises and falls below the set pressure again within a predetermined time. Therefore, the emergency shutoff valve 52 can be prevented from operating more than necessary.

On the other hand, the gas supply pressure measurement signal is input to the situation control room 91 in the pressure transmitter 71, and is configured to control the solenoid valve 80 through the remote control relay 93 in the situation control room 91.

At this time, the situation control room 91 may output a control signal to the solenoid valve 80 on the basis of the gas supply pressure measurement signal input from the pressure transmitter 71, but rather in the situation control room 91 when an emergency occurs It is preferable to control solenoid valve 80 directly. That is, when an emergency situation such as a fire, a gas leak, or a natural disaster occurs, the situation control room 91 uses the solenoid valve 80 to block the emergency shutoff valve 52 so as to stop the gas supply.

Here, the situation control room 91 is a part configured to remotely control and control various gas supply lines in a remote place, in case of an emergency or based on a signal input from the pressure transmitter 71, an emergency shutoff valve ( 52) for remote control. Of course, it is preferable that not only one gas supply line (system) but also several gas supply lines (system) can be configured so that all can be controlled by the situation control room 91.

The remote control relay 93 is configured to transmit a signal for operating the solenoid valve 80 according to the signal of the situation control room 91.

In FIG. 4, reference numeral 92 is a field terminal device included in the control unit 90 of the present invention. The field terminal device 92 transmits a signal of the pressure transmitter 71 to the situation control room 91 or the situation control room 91. It transmits a signal transmitted from) to the remote control relay 93.

The situation control room 91, the field terminal device 92, the remote control relay 93, the time relay 94, and the like constitute the control unit 90 and the delay means 95 of the present invention.

The next second approach can be configured to control the solenoid valve 80 with only the pressure transmitter 71, as illustrated in FIG. 7.

At this time, a digital relay 96 for receiving a signal from the pressure transmitter 71 is provided, and the digital relay 96 transmits a signal to the time relay 94 as described above. The signal of the pressure transmitter 71 is also transmitted to the field terminal device 92 or the situation control room 91.

Here, the digital relay 96 converts the signal of the pressure transmitter 71 into a digital signal, and outputs a control signal to the time relay 94 when the gas pressure input from the pressure transmitter 71 becomes greater than or equal to the set pressure. Configured to do so. Such a digital relay 96 is preferably configured to adjust the set pressure for operating the solenoid valve 80.

Since the control method of the solenoid valve 80 through the time relay 94 and the situation control room 91 is made the same as or similar to the above-described embodiment with reference to FIG. 4, the same reference numerals are given to FIG. Omit.

8 is a circuit diagram showing a control system according to the present invention, and shows that the two types of control unit 90 described above can be configured together.

For reference, the portion indicated by the hidden line in FIG. 8 shows a configuration that may be additionally installed when the additional gas supply line and the solenoid valve 80 are installed.

In Fig. 8, CS1 (CS2) is a remote cutoff control switch of the situation control room 91. It is also possible to configure the control command output unit instead of the remote cutoff control switch.

PRS1 (PSR2) is a pressure switch 73. This pressure switch may be the pressure transmitter 71 + digital relay 96 in FIG.

TLR1 (TLR2) represents a time relay 94 and R1 (R2) represents a remote control relay. And SV1 (SV2) represents the solenoid valve 80.

As described above, the technical ideas described in the embodiments of the present invention can be performed independently of each other, and can be implemented in combination with each other. While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications, and variations will be apparent to those skilled in the art. It is possible. Accordingly, the technical scope of the present invention should be determined by the appended claims.

Claims (7)

An emergency shut-off valve installed on the gas supply line to shut off the gas supply line when the pressure on the rear end supply line is greater than or equal to a set pressure;
A sensing line connected to the inner side of the emergency shutoff valve in the rear end supply line and supplying gas to the emergency shutoff valve according to a gas pressure of the rear end supply line;
A pressure measuring mechanism installed on the rear end supply line to measure a gas supply pressure;
A solenoid valve installed on the sensing line to open and close the sensing line;
When the gas pressure on the rear-side supply line is less than the set pressure by receiving the detection result of the pressure measuring device, the solenoid valve is controlled to cut off the sensing line. When the gas pressure on the rear-side supply line is above the set pressure, the solenoid And a control unit for controlling the valve to open the sensing line to control the gas pressure to flow into the emergency shutoff valve.
The method according to claim 1,
The emergency shutoff device of claim 1, wherein a preliminary sensing line connected to bypass the solenoid valve is provided on the sensing line.
The method according to claim 1,
The solenoid valve,
When the sensing line is shut off, the line connected to the rear supply line is shut off, and the line connected to the emergency shutoff valve is connected to the atmospheric pressure vent.
When the sensing line is opened, the atmospheric pressure vent port is shut off, and the emergency shutoff device for a constant pressure transformer, characterized in that configured to connect the line connected to the supply line and the emergency shut-off valve to the rear end side supply line.
The method according to claim 1,
And the control unit includes a delay means for delaying a predetermined time when the sensing line is opened by controlling the solenoid valve when the gas pressure on a rear supply line is equal to or greater than a set pressure.
The method according to claim 1,
The pressure measuring device is an emergency shutoff device, characterized in that the pressure switch for outputting the open signal of the sensing line when the gas pressure is above the set pressure.
The method according to claim 1,
The pressure measuring device is composed of a pressure transmitter for measuring the gas supply pressure,
And the solenoid valve is configured to be operated by a signal of a digital relay which receives a signal of the pressure transmitter and outputs a control signal when the gas pressure is higher than a set pressure.
The method according to any one of claims 1 to 6,
The control unit is an emergency shutoff device, characterized in that it comprises a situation control room that can remotely control the solenoid valve.

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