JP7233975B2 - valve device - Google Patents

Description

An embodiment of the present invention relates to a valve device that backs up normal operations by remote control.

Automatic valves such as motor-operated valves are installed in nuclear power plants as valves for activating cooling and isolation functions in order to respond to the occurrence of a serious accident or the like. By the way, it is assumed that the automatic operation function of the automatic valve will be lost when all power is lost. However, in order to safely shut down a nuclear power plant, it is required to operate this automatic valve from a safe location even when all power is lost.

In recent years, systems have been developed to back up the operating functions of automatic valves. The valve remote control system of the first known example is a technology that utilizes rotational torque generated by a preliminary torque input means driven by a standby power source. The proposal in this first known example is to transmit this rotational torque to a valve actuator via a through shaft and a flexible shaft to open and close this valve.

The proposal for the valve remote control system of the second known example is to provide an air drive mechanism in the manual handle part attached to the motor operated valve, provide an electromagnetic valve in the air pipe between the air drive mechanism and the air cylinder, and operate the electromagnetic valve. A storage battery capable of remote excitation operation is provided as the operation source, and the valve is opened and closed by these batteries. Further, in the third known example, a structure is proposed in which the opening/closing state of the valve can be grasped by inputting valve opening degree data to an operating device for opening/closing the valve.

JP 2014-118995 A JP 2018-28374 A JP-A-2003-35380

However, in the first known example, a flexible shaft made of twisted piano wires is housed in a protective tube. For this reason, there are cases where the efficiency of transmission of rotational torque is reduced due to friction between the flexible shaft and the protective tube. As a result, the longer the flexible shaft, the greater the load on the preliminary torque input means, and the longer the operating time. Therefore, there is a limit to the length of the flexible shaft. On the other hand, rough valve opening information can be grasped from the rotational speed of the preliminary torque input means. However, this method requires hundreds to thousands of rotations to close an open valve, so the obtained opening information is unreliable.

In the second known example, the storage battery capable of remote excitation operation is charged by an external power source during normal operation, but cannot be charged when the external power source is lost. Therefore, if the external power supply is lost for a long period of time, there is a possibility that remote control will not be possible due to battery exhaustion. In addition, since electronic equipment is used, there is a possibility that remote control may not be possible due to the effects of radiation noise in a serious accident environment.

In the third known example, an electronic device for grasping opening degree information and a valve operation jig are combined, and the target is a buried valve. For this reason, it cannot be said that this mechanism is suitable for remote control of the valve. Furthermore, since electronic equipment is used, there is a possibility that the degree of opening may not be grasped or may be inaccurate under the influence of noise caused by radiation under the environment of a serious accident.

The embodiments of the present invention have been made in consideration of such circumstances, and it is an object of the present invention to provide a valve device that can be operated remotely while accurately grasping the opening even in a state where power is lost. and

A valve device according to an embodiment includes an electric drive unit that controls the opening/closing operation of a valve body that partitions a flow path with supplied power, and a drive gas that is supplied while the supplied power is stopped to operate the valve. a first gas driving section for opening the valve body; a second gas driving section for receiving the supply of the driving gas when the power supply is stopped and closing the valve body; A first pipe for supplying a gas drive unit, a second pipe for supplying the drive gas to the second gas drive unit, and a third pipe for supplying the detection gas to the first gas drive unit and the second gas drive unit. and a pressure detection unit that detects the pressure of the detection gas, and an opening degree measurement unit that measures the opening degree of the valve element based on the pulsation of the pressure detected along with the opening operation and the closing operation. I have it.

An embodiment of the present invention provides a valve device that can be remotely operated while accurately grasping the opening even in a state of power loss.

BRIEF DESCRIPTION OF THE DRAWINGS The block diagram which shows the valve apparatus which concerns on 1st Embodiment of this invention. (A) A graph showing detection of pulsation in the pressure of the detection gas accompanying the opening/closing operation of the valve body, (B) A configuration diagram showing the pressure detection section and the opening degree measurement section in the embodiment. The block diagram which shows when a plant is in the state of power loss in the valve apparatus which concerns on 2nd Embodiment. The block diagram which shows when a plant is in a normal state in the valve apparatus which concerns on 2nd Embodiment.

(First embodiment)
An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a configuration diagram showing a valve device 10A according to a first embodiment of the invention. In this manner, the valve device 10A includes an electric drive unit 18 that controls the opening/closing operation of the valve body 16 that partitions the flow path 15 by the power supply 17, and the driving gas 25a in a state where the power supply 17 is stopped. A first gas driving portion 11 that receives the supply of the driving gas 25b to open the valve body 16, and a second gas driving portion that receives the driving gas 25b and closes the valve body 16 while the power supply 17 is stopped. 12, a first pipe 21 that supplies a drive gas 25a to the first gas drive unit 11, a second pipe 22 that supplies a drive gas 25b to the second gas drive unit 12, and a detection gas 26 to the first gas drive unit 12. 11 and the second gas drive unit 12, a pressure detection unit 35 that detects the pressure of the detection gas 26, and pressure pulsations detected with the opening and closing operations of the valve body 16. and an opening degree measurement unit 36 that measures the opening degree of the valve body 16 based on.

This valve device 10A is provided in a first space 41 in which the flow path 15 and the valve body 16 are accommodated and a second space 42 in which the first cylinder 31 and the second cylinder 32 are accommodated. The first space 41 and the second space 42 are separated by the partition wall 27 . The electric drive section 18 , the first gas drive section 11 and the second gas drive section 12 are arranged in the first space 41 . A pressure detection unit 35 and an opening degree measurement unit 36 are arranged in the second space 42 .

A pipe group including the first pipe 21 , the second pipe 22 and the third pipe 23 is installed via through holes 43 ( 43 a , 43 b , 43 c ) provided in the partition wall 27 . The first pipe 21 , the second pipe 22 and the third pipe 23 pass through through holes 43 ( 43 a , 43 b , 43 c ) provided in the partition wall 27 and are connected to the gas drive section 19 . It should be noted that the arrangement of the valve device 10A in the first space 41 and the second space 42 divided by the partition wall 27 is an example, and a continuous space without the partition wall 27 may be arranged.

When the plant is in the normal operating mode, the electrical drive 18 controlled by the power supply 17 performs the opening and closing operations of the valve body 16 . Fluid flows in the flow path 15 when the valve body 16 performs an opening operation. Further, when the valve body 16 is performing the closing operation, the flow path 15 is partitioned and the flow of fluid is stopped.

The valve body 16 is provided with a gas drive section 19 together with an electric drive section 18 . When a serious accident or the like occurs in the plant and the total power supply is lost, the power supply 17 is stopped and the electric drive unit 18 becomes inoperable. In such a situation, by supplying the drive gas 25 to the gas drive unit 19, the valve element 16 can be opened/closed.

The drive gas 25 can be supplied to the gas drive unit 19 remotely by extending the first pipe 21 and the second pipe 22 . Further, although the first cylinder 31 is illustrated as the supply source of the drive gas 25, a compressor or the like can also be used. By switching the supply of the drive gas 25 to the first pipe 21 and the second pipe 22 in this way, the opening operation and the closing operation of the valve element 16 can be switched. Ideally, the gas supplied to the gas drive unit 19 is nitrogen, which has little thermal expansion.

The first gas drive unit 11 uses the fluid energy of the drive gas 25 a supplied through the first pipe 21 to open the valve body 16 . The drive gas 25 that has worked to open the valve body 16 is discharged from the first gas drive section 11 . The exhaust gas pressure pulsates with a frequency corresponding to the opening speed of the valve body 16 .

The second gas drive unit 12 uses the fluid energy of the drive gas 25 b supplied through the second pipe 22 to close the valve body 16 . The drive gas 25 that has worked to close the valve body 16 is discharged from the second gas drive section 12 . The exhaust gas pressure pulsates with a frequency corresponding to the closing speed of the valve body 16 .

The distributor 37 is connected to the first cylinder 31 filled with the driving gas 25 . By operating a selector switch 39 provided in the distributor 37 , the drive gas 25 supplied from the first cylinder 31 is distributed to either the first pipe 21 or the second pipe 22 . Accordingly, the operator can operate the changeover switch 39 to open or close the valve body 16 .

FIG. 2A is a graph showing pressure pulsations of the detection gas 26 that accompany the opening/closing operation of the valve body 16 . The detection gas 26 supplied from the second cylinder 32 imparts static pressure to the discharge gas flow paths of the first gas driving section 11 and the second gas driving section 12 . The pressure pulsation of the discharged gas propagates with the opening and closing operations of the valve element 16, and the pressure of the detection gas 26 is pulsated.

The detection gas 26 can be supplied to the gas drive unit 19 remotely by extending the third pipe 23 . Moreover, although the second cylinder 32 is illustrated as the supply source of the detection gas 26, a compressor or the like can also be used.

FIG. 2B is a configuration diagram showing the pressure detection section 35 and the opening degree measurement section 36 in the embodiment. If the second space 42 is in a high-radiation environment, the pressure detection unit 35 and the opening degree measurement unit 36 are desirably mechanical in order to avoid malfunction due to radiation noise. may be electronic.

The pressure detection unit 35 is supported by a cylinder 45 provided in the third pipe 23 on the side connected to the second cylinder 32 filled with the drive gas 25, and by an urging member 47 against the cylinder 45, and is detected by the pulsation of the detection gas. and a displaceable piston 46 . The opening measurement unit 36 measures the opening of the valve body 16 based on the counted number of displacements of the piston 46 .

When the pressure of the detection gas 26 filled in the cylinder 45 pulsates, the pressure detection unit 35 displaces and vibrates the piston 46 according to the pressure vibration of the pulsation. Then, the displacement-vibrating piston 46 mechanically pushes the opening measurement unit 36 to count up the number of vibrations of the piston 46 , that is, the number of pulsations of the detection gas 26 . Then, the opening degree of the valve body 16 can be obtained by converting the obtained count number.

Note that the pressure detection unit 35 and the opening degree measurement unit 36 described above are examples, and are not limited to such forms. If the pressure pulsation associated with the opening operation and closing operation of the valve body 16 can be detected and the counted number of pulsations can be converted into the opening degree of the valve body 16, the pressure detection unit 35 and the opening measurement unit 36 It can be adopted as appropriate.

With the valve device 10A of the first embodiment described above, it is possible to remotely open and close the valve even when power is lost, grasp the valve opening status at the remote device position, and switch the valve opening and closing direction at the remote control position. becomes possible.

(Second embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. 3 and 4. FIG. FIG. 3 is a diagram showing the configuration of the valve device 10B according to the second embodiment when the plant is in a state of power loss. FIG. 4 is a configuration diagram showing the plant in a normal state in the valve device 10B according to the second embodiment. In FIGS. 3 and 4, parts having configurations or functions common to those in FIG. 1 are denoted by the same reference numerals, and overlapping descriptions are omitted.

As shown in FIG. 3, in the valve device 10B of the second embodiment, the first pipes 21a, 21b, the second pipes 22a, 22b and Third pipes 23a and 23b are connected. These pipe groups 21, 22, 23 can be detachably connected at the through holes 43 (43a, 43b, 43c).

As shown in FIG. 4, when the power supply is normal, the pressure detection unit 35 and the opening degree measurement unit 36 are not used. Therefore, the pipe groups 21b, 22b, 23b are separated from the through holes 43 (43a, 43b, 43c) and housed in the containment vessel 44 together with the first cylinder 31 and the second cylinder 32 . Thereby, a free space in the second space 42 can be secured. Then, when all power is lost, these pipe groups 21b, 22b, and 23b are connected to the through holes 43 (43a, 43b, and 43c), and the drive gas 25 is supplied to the gas drive unit 19, thereby 16 (FIG. 1) open/close can be operated.

According to the valve device of at least one embodiment described above, the drive gas can be used to open/close the valve body, and the detection gas can be used to measure the degree of opening of the valve body. As a result, the valve device can be remotely operated while accurately grasping the degree of opening even in a state where power is lost.

While several embodiments of the invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, changes, and combinations can be made without departing from the scope of the invention. These embodiments and their modifications are included in the scope and spirit of the invention, as well as the scope of the invention described in the claims and equivalents thereof.

DESCRIPTION OF SYMBOLS 10 (10A, 10B)... Valve apparatus, 11... 1st gas drive part, 12... 2nd gas drive part, 15... Flow path, 16... Valve body, 17... Power supply, 18... Electric drive part, 19... Gas Drive unit 21 (21a, 21b)... first pipe, 22 (22a, 22b)... second pipe, 23 (23a, 23b)... third pipe, 25 (25a, 25b)... drive gas, 26... detection gas , 27... Partition wall 31... First cylinder 32... Second cylinder 35... Pressure detector 36... Opening measuring part 37... Distributor 39... Changeover switch 41... First space 42... Second Space 43 Through hole 44 Storage container 45 Cylinder 46 Piston 47 Biasing member.

Claims (5)

an electric drive unit that controls the opening/closing operation of the valve body that partitions the flow path by supplied electric power;
a first gas drive unit that opens the valve body by receiving supply of drive gas in a state where the power supply is stopped;
a second gas drive unit that receives supply of a driving gas and causes the valve body to perform a closing operation in a state where the power supply is stopped;
a first pipe that supplies the driving gas to the first gas driving unit;
a second pipe that supplies the drive gas to the second gas drive unit;
a third pipe for supplying a detection gas to the first gas drive unit and the second gas drive unit;
a pressure detection unit that detects the pressure of the detection gas;
and an opening degree measuring unit that measures the degree of opening of the valve body based on the pulsation of the pressure detected along with the opening operation and the closing operation. The valve device according to claim 1,
A valve device comprising: a distributor connected to a first cylinder filled with the driving gas and configured to switch and distribute the driving gas to either one of the first pipe and the second pipe. In the valve device according to claim 1 or claim 2,
The pressure detection unit is
a cylinder provided in the third pipe on the side connected to the second cylinder filled with the detection gas;
a piston supported by a biasing member with respect to the cylinder and displaced by pulsation of the detection gas;
The opening measurement unit is a valve device that measures the opening of the valve body based on the count number of displacements of the piston. In the valve device according to any one of claims 1 to 3,
the electric drive section, the first gas drive section and the second gas drive section are disposed in a first space;
The pressure detection unit and the opening degree measurement unit are arranged in the second space,
The first space and the second space are separated by a partition,
A pipe group including the first pipe, the second pipe, and the third pipe is a valve device installed via a through hole provided in the partition wall. In the valve device according to claim 4,
The group of pipes can be detachably connected at the portion of the through hole,
The pressure detection unit and the opening degree measurement unit are valve devices separated by dividing the pipe group when the power supply is in a normal state.

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