JPH053686Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) The present invention relates to an emergency trip test device for testing the operation of an emergency governor, which is one of the safety devices of a steam turbine. In particular, this invention relates to an emergency trip test device that has been improved for the purpose of preventing erroneous operation of the device.

(Prior Art) An emergency trip device, which is one of the safety devices for steam turbines, is generally used to trip the turbine immediately if any abnormal condition occurs during turbine operation to protect the steam turbine from catastrophic damage. It has been established. Therefore, if the emergency trip device does not perform the initial operation when an abnormality occurs, the steam turbine will run out of control, so the emergency trip device should be inspected as often as possible.
It is necessary to always check that it is working properly.

Conventionally, this emergency trip test method artificially creates a condition equivalent to an abnormally overspeeded turbine, confirms the operation of the emergency trip device, and then
A method was used to restore normal conditions. This test is conducted during turbine operation without stopping the steam turbine.

By the way, the device used for the emergency trip test has a structure as shown in FIG.

That is, a vacant chamber 3 is formed in the test handle 2 of the emergency trip test device 1;
A conduction hole 4 is provided on one side of the housing.

A drive rod 7 for sliding the piston 6 is inserted into the doss pot 5, and the drive rod 7 is loosely inserted into the chamber 3 of the test handle 1 through the through hole 4.

A stopper 8 is attached to the tip of the drive rod 7,
Further, a spring 9 is interposed between the stopper 8 and the inner wall of the empty chamber 3, and the restoring force of the spring 9 allows the piston 6 of the dart pot 5 to quickly return to its original position after the test of the emergency trip device is completed. It is composed of

By connecting the test handle 2 and the dart pot 5 in a loosely-fitting manner as described above, the drive rod 7 is not directly influenced by the test handle 2. Therefore, even if an attempt is made to return the test handle 2 to its original state by applying a forced external force after the emergency trip device has finished operating, only the test handle 2 will move and the emergency trip device will not be reset.

The emergency trip device is reset by the action of pressurized oil supplied from the oil supply hole 10 of the dashpot 5.

With this structure, even if the test handle 2 is forcibly pushed in, the spring of the emergency trip device will only be compressed and the reset operation will not be affected, preventing malfunction of the device and improving reliability. will improve.

By the way, an example of the structure of the emergency trip device will be explained below.

A lever system 11 connected to the drive rod 7 moves the spool 13 of the pilot valve 12 up and down to control oil entry and exit from the oil feed port 14.

The oil in the oil feed port 14 is supplied to the piston 15, and the piston rod 16 compresses the spring 17 to release the rack 1.
A pinion 1 drives the rack 18 and meshes with the rack 18.
9 to drive the camshaft 20. camshaft 20
A lockout cam 21a, a reset cam 21b, and an oil trip cam 21c are attached to the lockout pilot valve 2, respectively.
2a, the reset pilot valve 22b and the oil trip pilot valve 22c are driven to supply oil to the respective lines.

(Problems to be Solved by the Invention) However, in the conventional emergency trip testing device described above, although manual operation of the test handle is possible, remote control of the test handle is not possible. For this reason, there has been a demand for the development of an emergency trip test device that can be operated both manually and remotely.

The present invention was made in response to the above-mentioned demands, and an object of the present invention is to provide an emergency trip test device that is highly reliable and can be remotely controlled.

[Structure of the invention] (Means for solving the problems) The emergency trip test device of the invention includes a dart pot forming a piston chamber, and a test handle arranged on one side of the dart pot and forming a vacant chamber inside. and a drive rod, one end of which was connected to the piston in the dart pot and the other end loosely connected to the cavity of the test handle, and a drive rod that was interposed between the drive rod and the cavity and between the piston head and the inner wall of the dart pot. In the emergency trip device for a steam turbine having a spring mechanism, a second piston chamber is formed on the other side of the dumppot, a pressure oil supply source supplies pressure oil to the piston chamber, and the pressure oil supply source A pressure oil control valve for controlling oil supply from the piston chamber is provided, and the driving rod is controlled by controlling and supplying pressure oil to the second piston chamber.

(Function) By using the above-mentioned means, the present invention can provide an emergency trip test device which is highly reliable and can be remotely operated.

(Embodiment) An embodiment of the present invention will be described below with reference to FIG. Note that the same parts as in FIG. 2 are given the same reference numerals, and the explanation of the overlapping parts will be omitted.

A conduction hole 4 is provided in one side of the cavity 3 formed in the test handle 2, and a drive rod 7 inserted into the dart pot 5 is loosely fitted into the test handle 2 through the conduction hole 4. It is connected.

The drive rod 7 is provided with a stopper 8,
The restoring force of the spring 9 causes the piston 6 of the dart pot 5 to quickly return to its original position after the test of the emergency trip device is completed.

By loosely connecting the test handle 2 and the dart pot 5 in this way, even if an attempt is made to return the test handle 2 to its original state by applying a forced external force after the emergency trip device has finished operating, the emergency trip device will not work. There will be no need to reset. The emergency trip device is reset by pressure oil supplied from the oil supply hole 10 of the dumppot 5.

On the other hand, a piston chamber is formed at the rear end of the drive rod 7, and the drive rod 7 passes through the through hole 4a and is connected to a piston 31 in the piston chamber, and the piston 31 passes through the through hole 4b and connects to the lever. It is connected to the mechanism 11.

This piston chamber has an oil supply hole 32 for the lever mechanism.
is provided, and pressure oil is supplied to the oil supply hole 32 from a pressure oil source 33 via an electromagnetic switching valve 34.

That is, when pressure oil is supplied into the piston chamber from the oil supply hole 32, the piston 31 moves toward the handle 2, and the drive rod 7 compresses the spring 9a.

At this time, the stopper 8 and one side portion 2a of the handle 2 move by the stroke of the piston 31 while being in contact with each other due to the force of the spring 9.

The stroke of the piston 31 is the stroke of the piston 31.
is the amount of movement until it comes into contact with the conduction hole 4a section.

Then, when the electromagnetic switching valve 34 is de-energized, the pressure oil from the pressure oil source 33 is stopped by the electromagnetic switching valve 34,
The pressure oil acting on the piston 31 flows backward through the oil supply hole 32 and flows to the drain from the drain port of the electromagnetic switching valve 34. Therefore, the oil pressure in the piston chamber decreases, and by the force of the spring 9a, the piston 31 moves until it comes into contact with the through hole 4b and returns to its original position.

By providing the piston 31 on the electromagnetic switching valve 34 and the drive rod 7 in this way, the electromagnetic switching valve 34 can be operated and the piston 31 can be driven by pressure oil from the pressure oil source 33 without operating the handle. This makes it possible to remotely control the handle 2.

Furthermore, as is clear from the above-mentioned structure, even if the electromagnetic switching valve 34 or the like malfunctions and remote control becomes impossible, the manual handle 2 is provided so that no manual operation can be performed. Operation is possible.
Therefore, the reliability of the device is improved and it becomes extremely practical.

[Effects of the Invention] As explained above, according to the emergency trip testing device of the present invention, it is possible to provide an emergency trip testing device that is remotely controllable and highly reliable.

[Brief explanation of drawings]

FIG. 1 is a schematic control system diagram showing the configuration of an emergency trip testing device according to the present invention, and FIG. 2 is a schematic control system diagram showing the configuration of a conventional emergency trip testing device. 2... Test handle, 3... Vacant chamber, 5... Dash pot, 6... Piston, 7... Drive rod,
9, 9a... Spring, 31... Piston, 32...
Oil supply hole, 33... Pressure oil source, 34... Solenoid switching valve.

Claims (1)

[Claims for Utility Model Registration] A dart pot forming a piston chamber, a test handle disposed on one side of the dart pot and having a vacant chamber inside, one of which is connected to the piston in the dart pot and the other of which is connected to the test handle. An emergency trip device for a steam turbine, comprising a drive rod loosely connected to a cavity of a handle, and a spring mechanism interposed between the drive rod and the cavity and between the piston head and the inner wall of the doss pot. A second piston chamber is formed on the other side of the dart pot, and a pressure oil supply source that supplies pressure oil to the piston chamber and a pressure oil control valve that controls oil supply from this pressure oil supply source are provided. An emergency trip testing device for a steam turbine, characterized in that the drive rod is controlled by supplying pressure oil to the second piston chamber.