JPS6226128B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic operating device used, for example, in power switching devices such as power switches and disconnectors.

For example, power switchgear, especially power disconnectors,
Considering that it is installed to protect the power grid, the response time from the time when the closing signal is input to the power disconnector until the main contact closes and the electric circuit is closed, that is, the closing time. It is desirable that the value be stable and constant.

However, when the closing and shearing operations are performed by a hydraulic system, the closing command is transmitted hydraulically, so there is a risk that the closing time may vary depending on the various operations of each valve. The disadvantage was that it was easy to cause variations and fluctuations in the input time.

An example of a conventional device will be described below based on the accompanying drawings showing a high-speed hydraulic operating device.

In FIGS. 1 and 2, FIG. 1 shows the disconnected state, and FIG. 2 shows the closed state, where the component parts of the electromagnetic hydraulic valve, numeral 1, are the closing electromagnetic coil, 2 3 is an input valve, 4 is an auxiliary oil drain valve and an operation valve for operating the input valve, 5 is an oil supply valve, 6 is a main oil drain valve, and 7 is an operation valve for operating the oil supply valve. , these constitute a control valve. 8 is a hydraulic cylinder for operating a movable contact 10 of a power shield breaker connected to a hydraulic piston 9 for operation; 11 is an accumulator for storing high-pressure oil;
12 is an oil pump, 13 is an oil tank, 14 is a high-pressure oil pipe, 15 and 16 are low-pressure oil pipes, 17 is an oil pipe for operating a refueling valve, and 18 is for operating a hydraulic piston 9 built into the hydraulic cylinder 8. This is an operating oil pipe for supplying high-pressure oil, and numeral 19 provided on the electrohydraulic valve is a check valve for closing, 20 is a check valve for disconnecting, and 21 is a closing valve 3 in the closing state. and a self-holding valve for supplying high-pressure oil to the right chamber of the auxiliary oil drain and input valve operation valve 4 so as to keep pushing the auxiliary oil drain and input valve operation valve 4 to the left in the figure. This is the oil flow path for high-pressure oil.

The conventional device is configured as described above, and its operation will be explained. In order to change from the shrunken state shown in FIG. Accumulator 11
When the pressure is increased and a closing signal is input, the closing electromagnetic coil 1 is energized and the closing check valve 19 is opened. The oil is sent to the right chamber of the operation valve 4 for operating the auxiliary oil drain/input valve, and the sheath cutoff check valve 20 is thereby closed.
The high-pressure oil thus sent to the right chamber of the auxiliary oil drain/input valve operating valve 4 is activated by pushing the auxiliary oil drain/inlet valve operating valve 4 to the left in the figure. It closes the gap with the valve seat and pushes the input valve 3 with its tip to open the gap with the valve seat. As a result, the accumulator 11 is
The high-pressure oil sent from the pump enters the self-holding high-pressure oil flow path 21 and the oil pipe 17 for operating the oil supply valve. The high pressure oil that has entered the self-holding high pressure oil flow path 21 enters the chamber on the right side of the operation valve 4 for operating the auxiliary oil drain valve and input valve.
Even if the input signal is cut off and the input check valve is closed, the input state is maintained by always pushing the auxiliary oil drain valve/loading valve operation valve 4 and input valve 3 to the left in the figure. and maintain self-preservation. On the other hand, the pressure oil that has entered the oil supply valve operating oil pipe 14 enters the lower part of the main oil drain valve 6, passes through the flow path provided in the main oil drain valve 6, and is provided inside the main oil drain valve 6. Oil supply valve operation valve 7
is pushed upward, thereby pushing up and opening the oil supply valve 5 which is in contact with the tip of the oil supply valve operating operation valve 7. As a result, the accumulator 11 and the operating oil pipe 18 communicate with each other, and high-pressure oil is sent from the accumulator 11 to the upper part of the hydraulic cylinder 8 via the operating oil pipe 18, thereby causing the hydraulic piston 9 to move. The movable contactor 10 connected thereto is pushed down and closed, and the power shield and disconnector are brought into the closed state as shown in FIG. 2.

In addition, in order to change from the closing state shown in FIG. 2 to the weeping state, the closing electromagnetic coil 1 is turned off, and a shrunken electromagnetic coil 2 is energized by inputting a shrunken signal. The closing check valve 19 is closed and the shrivel cutting check valve 20 is opened. As a result, the right side chamber of the auxiliary oil drain valve/input valve operation valve 4 and the low pressure oil pipe 15 are communicated with each other through the break and disconnection check valve 20.
The high-pressure oil in the right-hand chamber is drained into the low-pressure oil pipe 15, that is, the oil tank 13, and the right-hand chamber becomes low pressure. The operation valve 4 for operating the auxiliary oil drain valve and input valve is pushed to the right in the figure to close the input valve 3 and open the operation valve 4 for operating the auxiliary oil drain valve and input valve. Therefore, the oil pipe 17 for operating the oil supply valve is
By disconnecting from the high pressure oil pipe 14 and communicating with the low pressure oil pipe 15, the high pressure oil in the lower part of the main oil drain valve 6 and the oil supply valve operation valve 7 is passed through the oil supply pipe 17 for operating the oil supply valve. The oil is drained into the low pressure oil pipe 15, that is, the oil tank 13. In this way, the main oil drain valve 6
Since the lower part of the oil supply valve operation valve 7 has a low pressure and the upper part maintains high pressure oil, the main oil drain valve 6 is pressed downward and descends, opening the space between it and the valve seat. . Therefore, the operating oil pipe 18 and the low-pressure oil pipe 15 communicate with each other via the main oil drain valve, and the operating oil pipe 18, that is, the high-pressure oil in the upper part of the hydraulic cylinder 8, is transferred to the low-pressure oil pipe 15, that is, the oil tank 13. The oil is drained and the upper part of the hydraulic piston 9 is brought to low pressure. on the other hand,
The lower part of the hydraulic piston 9 is constantly in communication with the high-pressure oil pipe 14, so it is constantly receiving high-pressure oil. Therefore, the hydraulic piston 9 is pushed upward and rises, and the movable contact 10 connected thereto Lift up the power source and turn off the power source.

The conventional hydraulic operating device is configured and operates as described above. During the closing operation, the closing check valve 19 opens and high-pressure oil flows from the high-pressure oil pipe 14 through the closing check valve 19 to the auxiliary oil drain valve. When the high-pressure oil reaches the right chamber of the operation valve 4 for operating the auxiliary oil drain valve and input valve and pushes the operation valve 4 for operating the auxiliary oil drain valve and input valve to the left in the figure, some of the high-pressure oil that entered the chamber on the right side Since the oil enters the holding oil flow path 21 and is drained to the low pressure pipe 15 through this, the force pushing the auxiliary oil drain valve/filling valve operation valve 4 to the left becomes weaker, and therefore the filling It takes a long time, and since the self-holding oil flow path 21 forms a bent circuit, it is difficult to keep the flow resistance of high-pressure oil constant. The amount of oil also changes, and as a result, the amount of high-pressure oil flowing into the right chamber of the operation valve 4 for operating the auxiliary oil drain valve and input valve changes. The leftward movement of the valve also fluctuates, and therefore, the time required for this operation becomes longer, and due to this fluctuation, the operation of the valves in each part may also be delayed or take a long time, and furthermore, the valves may fluctuate. Hydraulic piston 9
The operation of the circuit is also delayed, extended, and fluctuated, and as a result, the closing time of each phase of the power switch and disconnector fluctuates, and the closing time of each phase also fluctuates and becomes longer than its allowable fluctuation value. Ta.

The present invention eliminates the drawbacks of such conventional devices and
When in the input state, high pressure oil is constantly supplied to the right chamber of the operating valve 4 for operating the auxiliary oil drain valve and input valve, and during that time, the operation valve for operating the auxiliary oil drain valve and input valve is operated so as to be closed at all times and is kept pressed. However, by installing a backflow prevention device in the self-holding high-pressure oil flow path that feeds high-pressure oil to prevent the flow from flowing against the flow of the self-holding high-pressure oil, it is possible to It is an object of the present invention to provide a high-speed hydraulic operating device that shortens the time required for closing from the input of a signal to the closing of a movable contact and does not cause fluctuations in the required closing time.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings showing one embodiment thereof.

In FIGS. 3 and 4, the self-holding high-pressure oil flow path 30 is provided with a reverse valve to prevent high-pressure oil from flowing back from the right chamber of the auxiliary oil drain/filling valve operation valve 4. A stop valve 31 is provided.

In such a device of the present invention, the charging check valve 19 opens during the charging operation, and the high pressure oil flows from the high pressure oil pipe 14 through the charging check valve 19 to the operation valve 4 for operating the auxiliary oil drain valve and charging valve. Even if oil is sent to the right chamber, the high pressure oil that has flowed into the right chamber cannot flow back into the self-holding high pressure oil passage 30 due to the check valve 31. The entire amount of high-pressure oil sent to the right-hand chamber has a function of pushing the auxiliary oil drain valve/input valve operating valve 4 to the left. It operates quickly and the time required is constant, and there is almost no variation in the time required from the operation of the charging electromagnetic coil 1 to the operation of the operation valve 4 for operating the auxiliary oil drain valve and input valve. This is because the force that pushes the auxiliary oil drain valve and input valve operation valve 4 to the left by the pressure oil on the right pressure receiving surface of the operation valve 4 for operating the auxiliary oil drain valve and input valve is the pressure on the left side of the input valve 3. The pressure oil on the surface pushes the auxiliary oil drain/input valve operation valve 4 to the right, and the spring on the left side of the injection valve 3 pushes the auxiliary oil drain/input valve operation valve 4 to the right. Since the force is set to be larger than the resultant force, the operation valve 4 for operating the auxiliary oil drain valve/input valve is self-maintained while operating to the left. As a result, high pressure is applied to the upper chamber of the hydraulic piston 9, and the movable contact 10 of the shatter breaker can be inserted and held.

In addition, in the shrinking operation, the closing check valve 1
9 is closed and the sill cut-off check valve 20 is opened.
The oil is drained into the low pressure oil pipe 15, that is, the oil tank 13, through the high pressure oil pipe and cutoff check valve 20 located in the right chamber of the operation valve 4 for operating the auxiliary oil drain valve/input valve. In this way, the operation valve 4 for operating the auxiliary oil drain valve and input valve
When the pressure in the chamber on the right side of the input valve 3 is reduced to low pressure, the input valve 3 is pushed to the right by the high pressure oil and the spring in the chamber on the left side of the input valve 3 and closed. The operating valve 4 is opened.

It should be noted that the closing operation and sheathing operation other than the above-mentioned closing operation and shearing operation are the same as those of the conventional device.

Next, another embodiment will be explained with reference to FIGS. 5 and 6 showing it.

5 and 6, 21a is one opening of the self-holding high-pressure oil passage 21, and the opening 21a side of the operation valve 40 for operating the auxiliary oil drain valve and input valve is provided with an auxiliary oil drain. A flange portion 40a is provided so that the opening 21a is closed by its outer peripheral surface when the operation valve 40 for operating the valve/inlet valve is open, and the opening is not closed when the operation valve 40 is closed. ,
The flange portion 40a is provided with a flow path through which fluid can freely flow before and after the flange portion 40a.

Since this embodiment is configured as described above, its operation is as follows.

In the damped state, that is, when the injection valve 3 is closed and the auxiliary oil drain valve and injection valve operating operation valve 40 is open,
When the closing electromagnetic coil 1 is actuated by the closing signal and the closing check valve is opened, high pressure oil from the high pressure oil piping 14, that is, the accumulator 11, passes through the closing check valve and is used to operate the auxiliary oil drain valve and closing valve. Enter the chamber on the right side of the operation valve 40 and press the operation valve 40 for operating the auxiliary oil drain valve and input valve.The outlet opening 21a of the self-holding high pressure oil flow path 21 is used for operating the auxiliary oil drain and input valve. Since it is closed by the outer peripheral surface of the flange portion 40a at the tip of the operation valve 40, the high pressure oil that enters the right chamber of the operation valve 40 for operating the auxiliary oil drain valve/input valve is a self-maintaining high pressure oil flow. Therefore, the entire amount of high pressure oil acts on the operation valve 40 for operating the auxiliary oil drain valve and input valve, and the operation valve 40 for operating the input valve 3 and the auxiliary oil drain valve and input valve. The operating valve 40 can be opened and closed quickly, and there is almost no variation in the time required for closing.

Note that when the auxiliary oil drain valve/inlet valve operation valve 40 is closed in this manner, the flange portion 40a is removed from the opening portion 21a as shown in FIG. It enters the high-pressure oil passage 21 for holding, then enters the chamber on the right side of the operation valve 40 for operating the auxiliary oil drain valve/input valve, and exhibits self-retaining properties.

In addition, for shearing, conventional equipment and
This is the same as in the embodiment.

In the above embodiment, the self-holding high-pressure oil flow path was partially provided as piping in the casings 32 and 41 of the electromagnetic hydraulic valve, but this high-pressure oil flow path was provided in the casing 3
2, 41 itself or the operation valve 4 for operating the auxiliary oil drain valve/input valve may be provided, thereby communicating the front and rear of the operation valve 4 for operating the auxiliary oil drain valve/input valve,
In addition, in the second embodiment, a flange portion 4 provided at the tip of the operating valve 40 for operating the auxiliary oil drain valve/input valve
0a, by closing one opening 21a of the self-holding high-pressure oil flow path to prevent backflow in the same flow path, but the self-holding high-pressure oil flow path also serves as an auxiliary oil drain valve. Separate the chamber side opening on the right side of the input valve operation valve from the flow path from the input check valve, and close the chamber side opening with the auxiliary oil drain valve and input valve operation valve. Furthermore, as shown in FIG. 7, a self-holding high-pressure oil flow path 50 may be provided in the auxiliary oil drain valve/filling valve operation valve itself 51, and one or both of its openings may be connected to an electromagnetic hydraulic system. It may be closed by the inner peripheral surface of the valve housing 52 or the protrusion 53 attached thereto.

As described above, the present invention is configured such that the high-pressure oil flow path is provided with a backflow prevention device that prevents the flow of high-pressure oil from flowing against the flow of self-retaining oil. The high-pressure oil does not flow backward into the high-pressure oil flow path, and the entire amount of high-pressure oil pushes the auxiliary oil drain valve/input valve operation valve. In turn, the closing valve also operates in a short time and without any variation, and as a result, the closing valve and the auxiliary oil drain valve operate quickly, and the time required from inputting the closing signal to closing the movable contact can be shortened. Enables high-speed input,
In addition, since there is almost no variation in the operation of the input valve and the operation valve for operating the auxiliary oil drain valve and input valve, the time required from inputting the input signal to closing the movable contact is quick. , it is possible to obtain a hydraulic operating device that can stabilize the response time of each phase and operate quickly without causing variations, and therefore, without variations in the input time between each phase. There is.

[Brief explanation of the drawing]

1 and 2 are longitudinal cross-sectional explanatory views of a conventional hydraulic operating device, FIGS. 3 and 4 are longitudinal cross-sectional explanatory views showing one embodiment of the present invention, and FIGS. 5 and 6 are explanatory longitudinal cross-sectional views of a conventional hydraulic operating device. FIGS. 1 and 3 are explanatory longitudinal cross-sectional views showing examples.
5 and 5 are longitudinal cross-sectional explanatory diagrams showing the cut-off state, and FIGS. 2, 4, and 6 are longitudinal cross-sectional views showing the loaded state,
FIG. 7 is a partially detailed sectional view of an electromagnetic hydraulic valve according to yet another embodiment. 1... Electromagnetic coil for charging, 2... Electromagnetic coil for cutting off, 3... Closing valve, 4, 40, 51... Operating valve for operating the auxiliary oil drain valve and charging valve, 5... Oil supply valve, 6
...Main oil drain valve, 7...Operating valve for oil supply valve operation, 8...
...Hydraulic cylinder, 9...Hydraulic piston, 10...
Movable contactor, 11... Accumulator, 12...
Oil pump, 13... Oil tank, 14... High pressure oil piping, 15, 16... Low pressure oil piping, 17... Oil piping for oil supply valve operation, 18... Oil piping for operation, 19...
Check valve for closing, 20...Check valve for closing, 21,
30, 50...Self-holding high pressure oil flow path, 21a...
...Opening portion, 31...Check valve, 32, 41, 52...
...Casing, 40a...Flange part, 53...Protrusion part.

Claims (1)

[Claims] 1. A hydraulic cylinder and a hydraulic piston for operation;
A refueling valve and a main oil drain valve that supply and drain oil to this, a refueling valve operation valve that operates the refueling valve, an input valve, an auxiliary oil drain valve and an input valve operation operation valve, and an auxiliary exhaust valve when in the input state. It has a self-holding high-pressure oil flow path that supplies high-pressure oil that operates to constantly close the operation valve for operating the oil valve and injection valve, and also has a self-holding high-pressure oil passage that operates to constantly close the operation valve for operating the injection valve and the injection valve by supplying and discharging the high-pressure oil. A hydraulic operating device having an electromagnetic hydraulic valve configured to open and close an operation valve for operating an auxiliary oil drain valve and input valve, the high pressure oil flow path having a flow opposite to the flow of high pressure oil for self-holding. A hydraulic operating device characterized by being provided with a backflow prevention device that prevents a flow from occurring. 2. In the hydraulic operating device according to claim 1, the self-holding high-pressure oil flow path is the casing itself of the electromagnetic hydraulic valve or a flow path provided in the casing having piping as a part thereof. A hydraulic operating device in which the backflow prevention device is a check valve. 3. In the hydraulic operating device according to claim 1, the self-holding high-pressure oil flow path is a flow path provided in the operation valve itself for operating the auxiliary oil drain valve/filling valve, and the backflow prevention device Hydraulic operating device where is a check valve. 4. In the hydraulic operating device according to claim 1, the self-holding high-pressure oil flow path is the casing itself of the electromagnetic hydraulic valve or a flow path provided in the casing having piping as a part thereof. The backflow prevention device controls the inlet or outlet of the high-pressure oil flow path by moving the auxiliary oil drain/inlet valve operating valve or the flange attached to the auxiliary oil drain/inlet valve. Hydraulic operating device that is a backflow prevention device that prevents backflow by closing with the outer peripheral surface of the hydraulic operating device. 5. In the hydraulic operating device according to claim 1, the self-holding high-pressure oil flow path is a flow path provided in the operation valve itself for operating the auxiliary oil drain valve/filling valve, and the backflow prevention device is provided. , the inlet or outlet of the high-pressure oil flow path is closed by the housing of the electromagnetic hydraulic valve or the inner peripheral surface of the protrusion attached to it by moving the operation valve for operating the auxiliary oil drain valve and injection valve, and the reverse flow is prevented. Hydraulic operating device that is a backflow prevention device that prevents.