JPH09242714A - Valve opening-closing control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent another valve from being operated by mistake when fluid apparatuses are inspected. SOLUTION: A water pressure control unit 1 is provided with an N2 vessel 2 in which N2 gas is filled and an accumulator 3 driven by N2 gas pressure from the N2 vessel 2. Fluid apparatuses such as a rupture disk unit 17, a pressure switch 18, a pressure gauge 19 and a level switch 20 are arranged in an instrumental pipe line 15 of an instrumental block 14. A first solenoid valve 21 is arranged in an N2 pipe line 7, and a second solenoid valve 22 is arranged in the instrumental pipe line 15, and a third solenoid valve 24 is arranged in a depressurizing pipe line 23. A control circuit 25 is constituted to drive so as to open and close a corresponding solenoid valve by selecting a solenoid valve of the apparatuses to be inspected from plural solenoid valves 21, 22 and 24 when inspection switches SW1 to SW5 arranged on an operation panel 26 are operated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve opening / closing control device, and more particularly to a valve opening / closing control configured to open or close valves arranged between a plurality of fluid devices to inspect the fluid devices. Regarding the device.

[0002]

2. Description of the Related Art In a facility in which a plurality of fluid devices are arranged in a pipe through which a fluid is fed, the fluid devices are regularly inspected. This type of fluid equipment includes a flow meter,
There are many devices such as pressure gauges, pressure control valves, flow control valves, accumulators, piston cylinder mechanisms, safety valves, and switching valves. In particular, when the equipment becomes large-scale, the pipeline structure becomes complicated, and the number of fluid devices arranged in each pipeline becomes enormous.

As an example thereof, in a control rod drive device of a water pressure drive system used in, for example, a nuclear power generation facility, during normal drive of the control rod, the control rod is slowly moved by the pressure of drive water supplied from a pump. However, when the reactor is to be shut down in an emergency, the control rods are moved rapidly and inserted into the reactor. When performing this emergency stop operation, a water pressure control unit (called “HCU”) configured to discharge high-pressure water is used, and the driving water pressure supplied from this device serves as the driving force. The control rod can be driven rapidly.

The above pressure accumulator has N_TwoN filled with gas
_TwoContainer and N_TwoN supplied from the container_TwoDepending on gas pressure
And an accumulator having a piston driven by
However, in case of an emergency stop, N_TwoPistol driven by gas pressure
Discharges the drive water in the accumulator to the control rod drive
It is configured to do. Therefore, N_TwoAlways keep the container under pressure
Compressed high pressure gas (N_TwoGas)
Have been. And N _TwoIn the pipeline communicating with the container,
N_TwoPressure gauge, pressure switch and
And a burst plate that bursts when the pressure exceeds the upper limit set pressure
A rupture disc unit having a unit is disposed.

Further, a scram valve opened at the time of an emergency stop, a plug for supplying driving water to the cylinder, and a drain for discharging the driving water are provided downstream of the piston-cylinder mechanism driven by the pressure in the N ₂ container. A fluid device such as a drain valve is provided.

[0006]

In the above facility, each fluid device is regularly inspected, and the operation of each fluid device is checked or the fluid device is removed from the pipeline if necessary and the parts are replaced. And so on. When performing such periodic inspections are carried out inspection after closing the valve of the fluid device is disposed conduit, for example in the case of performing the inspection of the N ₂ containers, N ₂ The inspection work is performed after closing the valves installed on the upstream and downstream sides of the container.

Further, when performing the inspection of a pressure gauge for detecting the pressure of N ₂ containers with to close the upstream side of the valve of the N ₂ containers, pressure gauge is disposed by opening the pressure relief valve It is necessary to reduce the pressure in the pipeline to atmospheric pressure. However, in this type of equipment, since the operator manually closes or opens each valve of the equipment to be inspected, there is a risk that other valves may be accidentally closed or opened. there were. In particular, in the case of a configuration in which a plurality of conduits are connected in a complicated manner, since a plurality of valves are arranged in proximity, it may be difficult to decide which valve should be closed.

Therefore, an object of the present invention is to provide a valve opening / closing control device that solves the above problems.

[0009]

In order to solve the above problems, the present invention has the following features. The present invention provides a plurality of fluid devices arranged in a pipeline through which a fluid is fed, a plurality of valves arranged between the fluid devices, and a plurality of valves provided corresponding to the plurality of fluid devices. A plurality of inspection switches that are operated when inspecting the fluid device; and a control means that opens or closes a valve of the fluid device corresponding to the inspection switch by operating the inspection switch. It is a thing.

Therefore, according to the present invention, since the valve of the fluid device corresponding to the inspection switch can be opened or closed by operating the inspection switch, the plurality of fluid devices and the plurality of valves are arranged close to each other. Even in such a case, it is possible to reliably open or close the valve of the fluid device to be inspected, and prevent accidentally opening or closing other unrelated valves.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a water pressure control unit to which a first embodiment of a valve opening / closing control device according to the present invention is applied.

[0012] Hydraulic Control Unit (HCU) 1 which is connected to the control rod drive of a nuclear power plant, the N ₂ container 2 N ₂ gas is filled, is driven by the N ₂ gas pressure from N ₂ container 2 And an accumulator 3. The accumulator 3 has a piston 4 slidably provided therein, an upper chamber 3a filled with driving water, and a lower chamber 3 filled with N ₂ gas.
It is defined as b.

The upper chamber 3a of the accumulator 3 is connected to a control rod drive device (not shown) via a drive water supply pipe line 5, and the drive water supply pipe line 5 is opened during an emergency stop operation. A scrum valve 6 and gate valves 7 and 8 are provided. The branch pipe 5a branched from the drive water supply pipe 5 between the scrum valve 6 and the gate valves 7 and 8 has a manual opening / closing valve 5b and a plug 5 for closing the ends of the branch pipe 5a.
c is attached.

A drive water supply line 9 is connected to the drive water supply line 5, and a gate valve 10 is arranged in the drive water supply line 9. Further, a drive water discharge pipeline 11 is connected to the drive water supply pipeline 5, and a drain valve 12 is arranged in the drive water discharge pipeline 11.

The lower chamber 3b of the accumulator 3 has N
It is connected to the lower portion of the N ₂ container 2 via the _two conduits 13. Therefore, the lower chamber 3b of the accumulator 3 is always N
₂ Pressurized with N ₂ gas from the container 2 and the upper chamber 3
The driving water a is pressurized by the piston 4. Normal,
Since the scrum valve 6 is closed, the accumulator 3
The piston 4 is stopped at a position where the pressures in the upper chamber 3a and the lower chamber 3b are balanced.

Therefore, when the scram valve 6 is opened by the emergency stop operation of the nuclear reactor, the piston 4 is driven by the pressure of the N ₂ gas, and the driving water filled in the upper chamber 3a is driven by the driving water supply pipe line. It is supplied to the control rod drive through 5
As a result, the piston / cylinder mechanism of the control rod drive device is driven to rapidly insert the control rod into the reactor.

The N ₂ pipe line 13 is connected to the instrumentation block 14
Is connected to the instrumentation pipe line 15 which is communicated to. The end portion of the instrumentation line 15 that extends from the accumulator 3 on the upstream side, a gas supply port for filling the N ₂ gas to the lower chamber 3b of the N ₂ gas N ₂ container 2 and the accumulator 3 And is normally closed by the plug 16. In addition, a rupture plate unit 17 that ruptures and releases the pressure when the pressure of the N ₂ container 2 is increased due to a temperature rise, and a signal when the pressure of the N ₂ container 2 reaches a predetermined pressure are provided in the instrumentation pipe line 15. A fluid device such as a pressure switch 18 for outputting, a pressure gauge 19 for detecting the pressure of the N ₂ container 2 and a level switch 20 for detecting the leakage of driving water are provided.

A first solenoid valve 21 that opens and closes between the N ₂ container 2 and the accumulator 3 is arranged in the N ₂ pipe line 13, and the upstream side of the N ₂ container 2 in the instrumentation pipe line 15 is arranged. A second solenoid valve 22 for opening and closing is provided. In addition, the instrumentation line 1 between the rupture disc unit 17 and the pressure switch 18
In the depressurizing conduit 23 branched from 5, the third depressurizing pipe is provided.
The electromagnetic valve 24 is provided.

Reference numeral 25 denotes a control circuit as a valve opening / closing control device. When the inspection switches SW1 to SW5 are operated, as will be described later, an electromagnetic valve of a device to be inspected from a plurality of electromagnetic valves 21, 22 and 24 is operated. The valve is selected to drive the corresponding solenoid valve to close or open.

The first and second solenoid valves 21 and 22 are normally open solenoid valves, and solenoids 21a and 22a for driving the valve bodies are excited by a control signal output from the control circuit 25. Then, the valve closes, and when demagnetized, it opens. In addition, the third solenoid valve 24
Is a normally-closed solenoid valve, which opens when the solenoid 24a for driving the valve element is excited by a control signal output from the control circuit 25 and closes when demagnetized. ing.

Reference numeral 26 denotes an operation panel, which is installed, for example, in a control room or the like for controlling each water pressure control unit. This operation panel 2
On the front surface of the panel of 6, the inspection switches SW1 to SW5 operated at the time of inspection for each fluid device and the inspection completion SW6 operated at the time of completion of the inspection are arranged. SW1 is a level switch inspection switch, SW2 is a pressure switch inspection switch, SW3 is a pressure gauge inspection switch, SW4 is a nitrogen container inspection switch, and SW5 is a scrum valve inspection switch.

FIG. 2 is a block diagram showing the circuit configuration of the control circuit 25. Here, inspection switches SW1 to SW5
The control operation of the control circuit 25 according to the operation of will be described. When the level switch checking SW1 is turned on, the signal from SW1 is output to the OR circuits 28 and 29, and the H level signal output from the OR circuits 28 and 29 is input to the S terminals of the flip-flops 31 and 32. Is entered.
The flip-flops 31, 32 are connected from the Q terminal to the solenoid valve 22,
24 solenoids 22a, 24a are energized. As a result, the solenoid valve 22 is closed and the solenoid valve 24 is opened. The flip-flops 31 and 32 are the OR circuits 28 and 29.
The output from the Q terminal is maintained even when the signal output from the L level is changed to the solenoid 22a of the solenoid valves 22 and 24,
24a is excited.

As described above, the solenoid valve 22 is closed to shut off the pressure in the N ₂ container 2 and the pressure in the instrumentation conduit 15 is reduced to atmospheric pressure by simply turning on the level switch inspection SW 1. To be done. Therefore, the operator can perform the inspection work of the level switch 20 without operating the valve, and if there is an abnormality, the level switch 20 can be detached from the instrumentation conduit 15 for repair or replacement work. . That is, instead of closing the solenoid valve 22 when inspecting the level switch 20, other valves are closed, and when the level switch 20 is removed from the pipeline, the drive water from the N ₂ container 2 spouts. Inconvenience can be prevented.

When the pressure switch inspection switch SW2 or the pressure gauge inspection switch SW3 is turned on, the solenoid valve 22 is closed and the solenoid valve 24 is operated in the same manner as in the case of SW1.
Can be opened. Therefore, an operator can inspect the pressure switch 18 or the pressure gauge 19 without operating the valve simply by turning on the pressure switch inspection SW2 or the pressure gauge inspection switch SW3. If there is, the pressure switch 18 or the pressure gauge 19 can be removed from the instrumentation conduit 15 for repair or replacement work.

When the nitrogen container inspection SW4 is turned on, the signal from SW4 is output to the OR circuits 27 and 28, and the H level signal output from the OR circuits 27 and 28 is flip-flop 30, It is input to the S terminal of 31. The flip-flops 30 and 31 energize the solenoids 21a and 22a of the solenoid valves 21 and 22 from the Q terminal. As a result, the solenoid valves 21 and 22 are closed. Then, the flip-flops 30 and 31 hold the output from the Q terminal even when the signals output from the OR circuits 27 and 28 become L level, and keep the solenoid valves 21 and 22 in the closed state.

A manual type main valve is attached to the N ₂ container 2, and by closing the main valve, the N ₂ container 2 can be connected to the N ₂ pipe line 13 without discharging the N ₂ gas to the outside. Can be removed from. In the case of the N ₂ container 2 without the original valve, when the nitrogen container inspection SW 4 is turned on, the electromagnetic valve 21 is closed and the electromagnetic valve 24 is opened to open the inside of the N ₂ container 2. The N ₂ gas is exhausted, and then the N ₂ container 2 is removed from the N ₂ line 13.

In this way, the solenoid valves 21 and 22 are closed and the upstream and downstream sides of the N ₂ container 2 are shut off by simply turning on the nitrogen container inspection SW 4. Therefore, the operator can perform the inspection work of the N ₂ container 2 without operating the valve, and when there is an abnormality, the N ₂ container 2 is put into the N ₂ conduit 13
It becomes possible to remove or repair or replace. That is, instead of closing the solenoid valves 21 and 22 when inspecting the N ₂ container 2, other valves are closed, and when the N ₂ container 2 is removed from the pipeline, the driving water is removed from the N ₂ container 2. It is possible to prevent the inconvenience such as the gushing out.

When the scrum valve inspection SW5 is turned on, the signal from SW5 is output to the OR circuit 27, and the H level signal output from the OR circuit 27 is input to the S terminal of the flip-flop 30. To be done. The flip-flop 30 is connected to the solenoid 21a of the solenoid valve 21 from the Q terminal.
Turn on electricity. As a result, the solenoid valve 21 is closed to shut off the connection between the scrum valve 6 and the N ₂ container 2. The flip-flop 30 receives the signal output from the OR circuit 27 as L
The output from the Q terminal is maintained even when the level is reached, and the solenoid valve 2
Keep 1 closed.

In this way, the solenoid valve 21 is closed and the upstream side of the N ₂ container 2 is shut off only by turning on the SW5 for inspecting the scrum valve. Therefore, the operator can perform the inspection work of the scrum valve 6 without operating the valve, and if there is an abnormality, remove the scrum valve 6 from the driving water supply pipe line 5 to repair or replace it. Will be possible. That is, when inspecting the scrum valve 6, other valves are closed instead of closing the electromagnetic valve 21, so that it is possible to prevent the inconvenience that the driving water spouts due to the pressure from the N ₂ container 2.

Each time the inspection work of the fluid equipment is completed, the inspection completion SW6 is turned on. SW for inspection completion
When 6 is turned on, R of each flip-flop 30-32
An H level signal is output to the terminal, and the outputs of the flip-flops 30 to 32 are reset. As a result, the solenoids 21a, 22a, 2 of the solenoid valves 21, 22, 24 are
4a is demagnetized, the solenoid valves 21 and 22 are opened, and the solenoid valve 2
4 is closed. Therefore, it is not necessary for the operator to operate the valve after the inspection is completed.

As described above, when inspecting each fluid device, it is not necessary to manually open or close the valve, so that another valve may be accidentally opened or closed. Even in the case where a plurality of valves are arranged close to each other, it is possible to perform the inspection work safely and efficiently without wondering which valve is operated.

In the first embodiment, an electromagnetic valve is provided between each of the rupture disc unit 17, the pressure switch 18, the pressure gauge 19, and the level switch 20, and an inspection switch is provided for each device. You can In that case, the rupture disc unit 17, the pressure switch 18, the pressure gauge 1
9. When inspecting the level switch 20 individually, the influence on other devices can be eliminated.

FIG. 3 is a block diagram of the second embodiment of the present invention. Reference numeral 41 is a gas supply pipeline for supplying city gas, for example, a medium-pressure pipeline buried underground in each area. In this gas supply conduit 41, an emergency shutoff valve 42 that performs an emergency shutoff operation due to the occurrence of an earthquake, a pressure control valve 43 that controls the secondary pressure supplied to the downstream side to a predetermined pressure, and a gas supplied to the downstream side. An instrumentation unit 51 including a flow meter 44 that measures the flow rate of the is provided.

In addition, the gas supply pipeline 41 has first to sixth three-way valves 45 to 5 which are switched when inspecting each device.
0 is provided. The first three-way valve 45 is the emergency shutoff valve 4
The second three-way valve 46 is arranged downstream of the emergency shutoff valve 42. The third three-way valve 47 is arranged on the upstream side of the pressure control valve 43, and the fourth three-way valve 48 is arranged on the downstream side of the pressure control valve 43. The fifth three-way valve 49 is arranged upstream of the flow meter 44, and the sixth three-way valve 50 is arranged downstream of the flow meter 44.

Each of the three-way valves 45 to 50 is an electromagnetically driven three-way valve, and is configured to be switched by a signal from the control circuit 52. Further, bypass pipe lines 53 to 55 are connected to the branch ports of the three-way valves 45 to 50, respectively. Normally, each of the three-way valves 45-50 has a bypass line 53-5.
5 is held in a closed state, and the one bypass pipelines 53 to 55 that bypass the inspection equipment are switched to communicate with the gas supply pipeline 41 only at the time of inspection. The bypass pipelines 53 to 55 are for not stopping the gas supply to the downstream side when inspecting each device, and feed the gas downstream by switching the three-way valves 45 to 50.

The operation panel 53 has inspection switches SW1 to SW4 which are operated when the inspection work is performed on the front surface of the panel.
Are arranged. SW1 is an inspection switch for an emergency shutoff valve, SW2 is an inspection switch for a pressure control valve, SW3 is an inspection switch for a flow meter, and SW4 is an inspection completion switch. When the inspection switches SW1 to SW4 are turned on, the three-way valves 45 to 50 are arranged so that one bypass pipeline 53 to 55 communicates with the gas supply pipeline 41 as described later.
The corresponding pair of three-way valves are switched.

Next, the control processing executed by the control circuit 52 will be described with reference to the flowchart of FIG. In step S1 (hereinafter, "step" is omitted), when the emergency shutoff valve inspection switch SW1 is turned on, the process proceeds to step S2, in which the first and second three-way valves 45 and 46 are excited to shut off the emergency shutoff valve. The upstream and downstream sides of 42 are blocked and the bypass line 5
Both ends of 3 are communicated with the gas supply line 41. As a result, the gas supplied from the upstream side flows into the bypass conduit 53 from the first three-way valve 45 and is supplied to the pressure control valve 43 via the second three-way valve 46.

Therefore, the operator must perform the inspection S for the emergency shutoff valve.
The inspection work of the emergency shutoff valve 42 can be performed only by turning on W1, and there is no need to manually switch the valves. When the inspection completion SW4 is turned on in the next S3, the process proceeds to S4 where the first and second three-way valves 45 and 46 are demagnetized to return to the state before the inspection work. As a result, the gas supplied from the upstream side is supplied from the first three-way valve 45 to the emergency cutoff valve 42, passes through the emergency cutoff valve 42, and is supplied to the pressure control valve 43. Therefore, the emergency shutoff valve 4
It is not necessary to manually switch the valves even after the inspection of 2 is completed.

When the emergency shutoff valve inspection SW1 is not turned on in S1, the process proceeds to S5, where it is determined whether the pressure control valve inspection SW2 is turned on. Here, when the inspection SW2 for the pressure control valve is operated to be turned on, the process proceeds to S6, and the third and fourth three-way valves 4
7, 48 are excited to shut off the upstream and downstream sides of the pressure control valve 43, and both ends of the bypass pipeline 54 are connected to the gas supply pipeline 41.
Communicate with. As a result, the gas supplied from the emergency cutoff valve 42 flows into the bypass pipe 54 from the third three-way valve 47, and is supplied to the flow meter 44 via the fourth three-way valve 48.

Therefore, the operator must check the pressure control valve S
The inspection work of the pressure control valve 43 can be performed only by turning on W2, and it is not necessary to manually switch the valves. When the inspection completion SW4 is turned on in the next S7, the process proceeds to S8, in which the third and fourth three-way valves 47, 48 are demagnetized to return to the state before the inspection work. As a result, the gas supplied from the emergency shutoff valve 42 is supplied from the third three-way valve 47 to the pressure control valve 43, passes through the pressure control valve 43, and is supplied to the flow meter 44. Therefore, it is not necessary to manually switch the valves even after the inspection of the pressure control valve 43 is completed.

In S5, when the pressure control valve inspection SW2 is not turned on, the process proceeds to S9, where it is determined whether the flow meter inspection SW3 is turned on. Here, when the inspection SW3 for the flow meter is operated to be turned on, the process proceeds to S10 and the fifth and sixth three-way valves 49, 50 are operated.
Is excited to block the upstream and downstream sides of the flowmeter 44, and both ends of the bypass pipeline 55 are communicated with the gas supply pipeline 41. As a result, the gas supplied from the pressure control valve 43 flows into the bypass pipe line 55 from the fifth three-way valve 49,
It will be supplied to the downstream side via the sixth three-way valve 50.

Therefore, the operator must check the flow meter SW3.
The inspection work of the flowmeter 44 can be performed only by turning on the switch, and it is not necessary to manually switch the valves. When the inspection completion SW4 is turned on in the next S7, the process proceeds to S8, where the fifth and sixth three-way valves 49, 50 are demagnetized to return to the state before the inspection work. As a result, the gas supplied from the pressure control valve 43 is supplied to the flow meter 44 from the fifth three-way valve 49, passes through the flow meter 44, and is supplied to the downstream side. Therefore, it is not necessary to manually switch the valves even after the inspection of the flowmeter 44 is completed.

In S9, the flow meter inspection S
When W3 is not operated to be turned on, the process of this time is ended and the process returns to S1. In this way, the operator operates the operation panel 53
It is possible to switch the three-way valve provided on the upstream and downstream sides of the equipment to be inspected by simply operating the inspection switches SW1 to SW4 provided in In addition, it is possible to easily perform the inspection work without requiring the valve switching operation during the inspection work.

It is needless to say that the present invention can be applied to equipment provided with fluid equipment other than the first and second embodiments. Further, in the above embodiment, the solenoid valve or the electromagnetically driven three-way valve has been described, but the present invention is not limited to this, and it goes without saying that a valve operated by an air signal or a hydraulic signal may be used.

[0045]

As described above, according to the present invention, since the valve of the fluid device corresponding to the inspection switch can be opened or closed by operating the inspection switch, the plurality of fluid devices and the plurality of valves can be operated. Even if the valves are arranged close to each other, the valve of the fluid device to be inspected can be opened or closed without fail, and it is possible to prevent the opening or closing of other unrelated valves by mistake. it can. Further, the valve operation is not required when performing the inspection work, and the inspection work can be performed in a short time.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a water pressure control unit to which a first embodiment of a valve opening / closing control device according to the present invention is applied.

FIG. 2 is a block diagram showing a configuration of a control circuit.

FIG. 3 is a configuration diagram of a gas supply system passage to which a second embodiment of the valve opening / closing control device according to the present invention is applied.

FIG. 4 is a flowchart illustrating a control process executed by a control circuit.

[Explanation of symbols]

1 Water Pressure Control Unit 2 N ₂ Container 3 Accumulator 4 Piston 5 Drive Water Supply Pipeline 6 Scrum Valve 13 N ₂ Pipeline 15 Instrumentation Pipeline 17 Bursting Disc Unit 18 Pressure Switch 19 Pressure Gauge 20 Level Switch 22 First Solenoid Valve 22 second solenoid valve 24 third solenoid valve 25,52 control circuit 26,53 operation panel SW1 to SW5 inspection switch 41 gas supply line 42 emergency shutoff valve 43 pressure control valve 44 flow meter 45 to 50 1st to 1st Sixth three-way valve

Claims (1)

[Claims] 1. A plurality of fluid devices arranged in a pipeline through which a fluid is fed, a plurality of valves arranged between the fluid devices, and a plurality of valves provided corresponding to the plurality of fluid devices, A plurality of inspection switches operated when inspecting the fluid device; and a control means for opening or closing a valve of the fluid device corresponding to the inspection switch by operating the inspection switch. Valve opening and closing control device.