JPS6151643B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a bypass valve testing device for a nuclear turbine.

In nuclear power plants, there is a difference between the amount of steam generated in the reactor and the amount of steam required by the turbine, such as when the plant starts and stops, or when the load on the steam turbine is cut off, resulting in a large amount of steam generated by the reactor. In order to bypass the turbine and release the excess steam to the condenser, a turbine bypass valve (hereinafter referred to as
(abbreviated as TBV).

This TBV has a valve drive hydraulic cylinder attached to the lower part of the valve chest, and the valve stem that is directly connected to the valve body of the TBV and the piston and piston rod in the valve drive hydraulic cylinder are connected to the valve stem via a lever. and by the movement of said piston
It is designed to operate the TBV valve stem.

This TBV is closed during normal turbine operation. Typically, TBV doesn't work for months, so you need to test it to make sure it works when you need it.

Currently, TBV, hydraulic cylinder for valve drive and conventional
The relationship between the TBV and the test equipment will be explained in more detail with reference to FIG. 1. The TBV 1 is connected to a valve driving hydraulic cylinder 4, and the valve driving cylinder 4 is connected to a control pilot valve 13.

The valve driving hydraulic cylinder 4 and the control pilot valve 13 constitute a driving device for the TBV 1,
The cam 14 that operates the control pilot valve 13 is rotated counterclockwise in response to the control signal A, and the control pilot valve 13 is changed from the closed state shown in FIG. 1 to the open state via the cam follower 15 and lever 16. When the control pilot valve 13 is switched to the second cylinder 6 of the valve driving hydraulic cylinder 4, the second piston 8 is driven to the forward side, and the piston rod 11, the lever 12, and the valve are Rod 3 is operated to the forward side, TBV1
The valve body 2 is opened and excess steam is discharged.

When the control pilot valve 13 is switched to the closed state again, the flow into the second cylinder 6 of the valve driving hydraulic cylinder 4 is cut off, and the spring force of the second compression spring 10 of the valve driving hydraulic cylinder 4 The second piston 8 is pushed to the return side and is pushed through the piston rod 11, lever 12 and valve stem 3.
Valve body 2 of TBV1 is closed.

The conventional test device for TBV1 includes a test cylinder 17 and a test pilot valve 23 connected to the test cylinder 17 via a needle valve 22 and having an electromagnetic solenoid 26.
Then, the electromagnetic solenoid 26 is energized from the state shown in FIG. 1 in which the test pilot valve 23 is closed, the spool 24 of the test pilot valve 23 is moved to the forward side, and when the test pilot valve 23 is opened, the pressure oil Q is supplied into the piston chamber 18 of the test cylinder 17 through a passage having a test pilot valve 23 and a needle valve 22, and the piston 19 in the test cylinder 17 is moved to the forward side, whereby the piston rod 20, the connection and the lever 27 , 28, 29, the lever 16 for switching the control pilot valve 13 is operated in conjunction with the control pilot valve 13, and the control pilot valve 13 is switched to the open state.
valve body 2 is opened. Next, electromagnetic solenoid 26
is demagnetized, the spool 24 of the test pilot valve 23 is pushed toward the return side by the compression spring 25, the piston 19 of the test cylinder 17 is moved toward the return side by the compression spring 21, and the piston chamber 18
The pressure oil in the test cylinder 17 is discharged through the passage having the needle valve 22 and the test pilot valve 23, and as the piston 19 in the test cylinder 17 is operated to return, the cam is discharged through the piston rod 20, the connection and the levers 27, 28, 29. 14
Push the lever 1 up to the position where the cam follower 15 comes into contact with it.
6 is moved, thereby switching the control pilot valve 13 to the closed state, and through the above-described operation, the valve body 2 of the TBV 1 is closed again.

The test time for opening and closing the valve body 2 of the TBV 1 is controlled by adjusting the throttle of the needle valve 22 installed between the test cylinder 17 and the test pilot valve 23.

However, in the conventional test device in which the test pilot valve 23 is controlled by the electromagnetic solenoid 26,
The operation of the test pilot valve 23 is dependent on the attraction force of the electromagnetic solenoid 26, and since the attraction force of the electromagnetic solenoid 26 cannot be made that large, the operation of the test pilot valve 23 has its own limits. In addition, it is expected that the suction performance will deteriorate due to age-related deterioration of the coil of the electromagnetic solenoid 26, fluctuations in the in-house power supply, etc. If the valve test of TBV1 is carried out under such conditions, there will be a drawback that the frictional force of the sliding part will increase and that it will not be possible to deal with the occurrence of a slight step phenomenon in the sliding part due to minute foreign matter in the pressure oil.

SUMMARY OF THE INVENTION An object of the present invention is to provide a TBV test device that can increase the operating force of a test pilot valve as necessary and prevent malfunctions, in order to eliminate the drawbacks of the conventional TBV test device. .

The present invention is characterized in that a fluid pressure cylinder is attached to one end of the test pilot valve to control the spool of the test pilot valve in the opening direction of the supply port leading to the test cylinder, and the other end Pressure oil is introduced into the test pilot valve to push the spool of the test pilot valve in the direction of closing the supply port leading to the test cylinder, and a compression spring is installed in the test pilot valve control fluid pressure cylinder. The TBV is based on the fact that an electromagnetic switching valve for cylinder switching is connected, and with this configuration, the operating force of the test pilot valve can be increased and malfunction can be prevented.
A test device was obtained.

The present invention will be explained below based on the drawings.

FIG. 2 shows an embodiment of the present invention, in which TBV1 is linked to a valve drive device and a test device.

TBV1 is a valve body 2 and a valve stem 3 for opening and closing the valve body 2.
It is equipped with

The valve driving device has a valve driving hydraulic cylinder 4, a control pilot valve 13, and an operation section for the control pilot valve 13 including a cam 14. The valve driving hydraulic cylinder 4 includes a first cylinder 5, a second cylinder 6 inserted into the center of the cylinder, a first cylinder 6 inserted into the first and second cylinders 5 and 6, respectively.
It is equipped with second pistons 7, 8 and first and second compression springs 9, 10 that respectively press the first and second pistons 7, 8 to the return side, and the TBV 1 and the valve driving hydraulic cylinder 4. is connected to a piston rod 11 attached to the second piston 8 via a lever 12. Then, the valve drive device is controlled as the cam 14 of the operating section is rotated counterclockwise in response to the control signal A, the cam follower 15 is moved upward, and the lever 16 is moved upward. The pilot valve 13 is switched from closed to open, a passage connecting the control pilot valve 13 and the second cylinder 6 of the valve driving hydraulic cylinder 4 is opened, pressure oil Q is supplied to the second cylinder 6, and the passage is opened. 2
The piston 8 of the TBV1 is driven upward, and the valve body 2 of the TBV1 is opened by the interlocking of the piston rod 11, lever 12, and valve stem 3 of the TBV1. When it is rotated to the return side, the control pilot valve 13 is switched to close via the cam follower 15 and the lever 16, the passage connecting the control pilot valve 13 and the valve driving hydraulic cylinder 4 is closed, and the valve driving hydraulic cylinder 4 is closed. The second piston 8 of 4 is pushed back by the second compression spring 10, and the piston rod 1
1. The valve body 2 of the TBV 1 is configured to be closed by interlocking the lever 12 and the valve stem 3.

The test device includes a test cylinder 17, a test pilot valve 30, a pneumatic cylinder 40 which is a fluid pressure cylinder for controlling the test pilot valve, and an electromagnetic switching valve 46 for switching the pneumatic cylinder.
It has

The test cylinder 17 includes a piston chamber 18, a piston 19, a piston rod 20 attached thereto, and a compression spring 21 that presses the piston 19 toward the return side. Pressure oil q is supplied to the piston chamber 18, and the piston 19 When driven to the forward side, the piston rod 20, levers 27, 28, 2
9 is interlocked to the forward side, the control pilot valve 13 is opened via the lever 16 to which the cam follower 15 of the operating section is attached, and the flow of pressure oil Q into the piston chamber 18 is stopped. ,
The piston 19 is pushed to the return side by the spring force of the compression spring 21 in the test cylinder 17, and is operated in conjunction with the piston rod 20, the levers 27, 28, 29, and the lever 16 of the cam follower 15 to the return side, and the control pilot valve 13 is activated. Configured to be closed.

The test pilot valve 30 is located in the pilot chamber 3.
1, spool 32, a compression spring 33 provided in the pilot chamber 31 and pushing the spool 32 in the closing direction, first, second, and third supply ports 34, 3;
5, 36, and a discharge port 37. First and second supply ports 3 of test pilot valve 30
4 and 35 are connected to the pressure oil supply side circuit of the valve driving device through a passage 38, and a third supply port 36
is connected to the piston chamber 18 of the test cylinder 17 through a passage 39. In the test pilot valve 30, the spool 32 is pushed in the closing direction by the pressure oil Q introduced from the first supply port 34 through the passage 38 and the compression spring 33 in the piston chamber 31, and the second and third supply port 3
5 and 36 are closed, and the test pilot valve 30
When the spool 32 is pushed in the opening direction by the pneumatic cylinder 40 for controlling the test pilot valve, the passage 39 between the supply ports 35 and 36 is opened, and the passage 39 is closed.
8. Pressure oil Q is supplied to the piston chamber 18 of the test cylinder 17 through the second and third supply ports 35 and 36 and the passage 39.

The pneumatic cylinder 40 for controlling the test pilot valve has a piston chamber 41 and a first stopper 4 screwed into a screw formed in the piston rod 43.
4. A bolt-shaped second stopper 45 is provided facing the piston chamber 41 from the head of the pneumatic cylinder 40 and whose operating position can be adjusted. When the compressed air a is supplied to the piston chamber 41 of the pneumatic cylinder 40, the piston 42 is moved to the forward side, the piston rod 43 pushes the spool 32 of the test pilot valve 30 in the opening direction, and the piston chamber 41 When the supply of compressed air a to the test pilot valve 30 is cut off, the piston 42 is pushed toward the return side by the spring force of the compression spring 33 of the test pilot valve 30 and the pressure oil Q supplied to the pilot chamber 31 side of the test pilot valve 30. It is pushed back by the advanced spool 32. By adjusting the position of the first stopper 44 that contacts one inner end surface of the pneumatic cylinder 40, the forward movement stop position of the piston 42 is adjusted.
The stop position of the spool 32 in the opening direction is adjusted, and the return stop position of the piston 42 is adjusted by adjusting the operating position of the second stopper 45 that the piston 42 of the test pilot valve 40 contacts. As a result, the stop position of the spool 32 of the test pilot valve 30 in the closing direction is adjusted.

Electromagnetic switching valve 46 of the pneumatic cylinder 40
are the spool 47, the first and second supply ports 4
8, 49, discharge port 50, compression spring 51 that pushes the spool 47 in the direction of closing the first and second supply ports 48, 49, first and second supply ports 4
It has an electromagnetic solenoid 52 that attracts the spool 47 in the direction in which the electromagnetic switching valve 46
and the pneumatic cylinder 40 are connected via a passage 53. In the normal state, this electromagnetic switching valve 46 is set to communicate with the second supply port 49 and the discharge port 50, so that the compressed air a in the pneumatic cylinder 40 can be released, and the electromagnetic solenoid 52 is activated by a control signal. When excited, the spool 47 is moved in the opening direction, opening the first and second supply ports 48 and 49, and the compressed air a flows through the first and second supply ports 48 and 49 and the passage 5.
3 to the pneumatic cylinder 40 and when the electromagnetic solenoid 52 is demagnetized, the compression spring 5
The spool 47 is pushed in the closing direction by the spring force of 1, and the space between the first and second supply ports 48 and 49 is closed.
The second supply port and the discharge port 50 are configured to be opened again.

In the test device for TBV1 having the above-mentioned configuration, in the state shown in FIG. 2, the electromagnetic switching valve 46 is set to close between the first and second supply ports 48 and 49;
The piston 42 of the pneumatic cylinder 40 is set to the return position, the spool 32 of the test pilot valve 30 is set to the closed position, and the space between the second and third supply ports 35 and 36 of the test pilot valve 30 is set to be closed. The passage 39 connecting the test pilot 30 and the test cylinder 17 is closed, and therefore the TBV 1 is closed via the valve drive device.

The test device is configured such that when the electromagnetic solenoid 52 of the electromagnetic switching valve 46 is energized from the state shown in FIG. 2 and switched between the first and second supply ports 48 and 49 of the electromagnetic switching valve 46 during operation of the turbine, Compressed air a is supplied to the pneumatic cylinder 40 through the first and second supply ports 48 and 49 and the passage 53, the piston 42 of the pneumatic cylinder 40 is pushed to the forward side, and the piston rod 43 releases the spool of the test pilot valve 30. 32 is pushed in the opening direction, and the second and third test pilot valves 30
The supply ports 35 and 36 are switched open.

As a result, the pressure oil Q on the valve driving device side is bypassed through the passage 38, and the pressure oil Q is supplied to the second and third supply ports 35, 3 of the test pilot valve 30.
6. The pressure oil Q is supplied to the test cylinder 17 through the passage 39, and the piston 19 of the test cylinder 17 is pushed upward by the pressure oil Q, and the control pilot valve 13 of the valve drive device is operated to open, thereby increasing the valve drive hydraulic pressure. TBV1 is opened via cylinder 4.

Next, when the electromagnetic solenoid 52 of the electromagnetic switching valve 46 of the test device is demagnetized, the space between the first and second supply ports 48 and 49 of the electromagnetic switching valve 46 is closed, and the connection between the test pilot valve 30 and the valve drive device side is closed. The spool 32 of the test pilot valve 30 is compressed by the pressure of the pressure oil Q introduced into the pilot chamber 31 of the test pilot valve 30 from the passage 38 connecting the
is pushed in the closing direction, the connection between the second and third supply ports 35 and 36 of the test pilot valve 30 is switched to close, and the piston rod 43 of the pneumatic cylinder 40 is pushed toward the spool 3 of the test pilot valve 30.
2, the compressed air a in the pneumatic cylinder 40 is discharged to the outside through the passage 53, the second supply port 49 and the discharge port 50 of the electromagnetic switching valve 46, and at the same time, the test cylinder 17
The pressure oil Q in the piston chamber 18 is returned to the tank (not shown) through the passage 39, the third supply port 36 and the discharge port 37 of the test pilot valve 30, and the piston 19 of the test cylinder 17 is compressed by the compression spring 21. It is pushed to the return side, the control pilot valve 13 of the valve drive device is closed, the valve drive hydraulic cylinder 4 is moved back, and the TBV1 is closed.

By repeating the above operations,
This allows TBV1 to be repeatedly tested for opening and closing.

Furthermore, even if there is no pressure oil Q before starting the turbine, the spring force of the compression spring 33 in the pilot chamber 31 causes the spool 3 of the test pilot valve 30 to
2 is held at a normal position closing between the second and third supply ports 35 and 36. Therefore, due to the loss of pressure of the pressure oil Q, the spool 32 of the test pilot valve 30
moves uncontrollably and the second and third supply ports 3
5 and 36 are communicated, the test device enters the valve open test state, and failures that may lead to malfunction are prevented.

Note that the first stopper 44 of the pneumatic cylinder 40
By adjusting the opening area of the discharge port 37 of the test pilot valve 30, the closing time of the TBV1 can be adjusted. By changing the opening area of the supply port 35, the opening time of the TBV1 can be adjusted.

Note that in FIGS. 1 and 2, the same members are designated by the same reference numerals.

The present invention has the configuration and operation described above, and the test pilot valve is actuated in the opening direction by a specially provided fluid pressure cylinder, and pressure oil introduced into the pilot chamber side and a compression spring provided in the pilot chamber are operated. Since the test pilot valve is configured to operate in the closing direction, it not only has the effect of significantly increasing the driving force of the test pilot valve, but also prevents the test pilot valve from malfunctioning when there is no pressure oil before starting the turbine. effective.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of a conventional device, and FIG. 2 is a system diagram of the device of the present invention. 1... TBV, 2... Valve body, 3... Valve rod,
4... Hydraulic cylinder for valve drive, 5, 6... First and second cylinders, 7, 8... First and second pistons, 9, 10... First and second compression Spring, 11...Piston rod, 12...Lever, 13...Control pilot valve, 14...Cam,
15...Cam follower, 16...Lever, 17...
Test cylinder, 18... Same piston chamber, 19...
...Same piston, 20...Piston rod, 21...
...the same compression spring, 34, 35, 36...the same first, second, and third supply ports, 37...the same discharge port,
38... Passage connecting the test pilot valve and the hydraulic pressure supply circuit of the valve drive device, 39... Passage connecting the test pilot valve and the test cylinder, 40...
Pneumatic cylinder serving as a fluid pressure cylinder, 41...piston chamber, 42...piston, 43...piston rod, 44, 45...first and second stoppers, 46...electromagnetic switching valve, 47... The same spool, 48, 49...the first and second supply ports, 50...the same discharge port, 51...the same compression spring, 52...the same electromagnetic solenoid, 53...the electromagnetic switching valve and the pneumatic cylinder The connecting passage, a...
Compressed air, Q...pressure oil.

Claims (1)

[Scope of Claims] 1. A bypass valve of a nuclear power turbine is opened and closed by a valve drive device including a control pilot valve, a hydraulic cylinder for driving the valve, a cam, and its moving member, and the valve drive device is operated during operation of the turbine. In an apparatus for testing the opening and closing of the bypass valve via a test device including an associated hydraulically driven test cylinder and a test pilot valve, a spool of the test pilot valve is placed at one end of the test pilot valve for testing. A hydraulic cylinder is installed to control the supply port leading to the cylinder in the opening direction, and pressure oil is introduced to the other end to push the spool of the test pilot valve in the direction of closing the supply port leading to the test cylinder. A bypass valve testing device for a nuclear turbine, characterized in that a compression spring is provided, and an electromagnetic switching valve for switching the fluid pressure cylinder is connected to the test pilot control fluid pressure cylinder. 2. The nuclear turbine bypass valve testing device according to claim 1, wherein the test pilot control fluid pressure cylinder is a pneumatic cylinder. 3. The pressurized oil that pushes the spool of the test pilot valve in the direction of closing the supply port leading to the test cylinder is branched from the hydraulic pressure supply side circuit of the valve driving device and introduced. A bypass valve testing device for a nuclear turbine according to claim 1.