JPS6031134Y2 - Control valve for hydraulic operating device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a control valve in a hydraulic operating device used, for example, in a power switching device such as a power circuit breaker.

For example, in power switchgear, especially power circuit breakers,
In order to improve the stability of the power system network, it is necessary to make the response time constant from the time when a switching operation signal is input to the power circuit breaker until the time when the main contact opens and closes.

In particular, in large-capacity power circuit breakers that have separate operating devices for each phase, the above response times for each phase must be kept constant in order to accurately set the phase difference between each phase. What you are doing is especially needed.

However, in conventional power circuit breakers that employ a hydraulically operated shutoff and shutoff system, the response time is not necessarily constant, but generally fluctuates.

Hereinafter, an example of a conventional device will be explained based on the accompanying drawings, FIGS. 1 and 2, which show a high-speed hydraulic operating device of a hydraulic cutoff/input type.

Fig. 1 shows the cut-off state, and Fig. 2 shows the cut-off state, in which the components of the electromagnetic hydraulic valve are 1 a closing electromagnetic coil, 2 a cut-off electromagnetic coil, 3 a closing valve, 4 It is an operating valve for operating a closing valve and a closing valve, and 5, which constitutes a control valve, is a refueling valve, 6 is an oil drain valve, 7 is an operating valve for operating a refueling valve, 8 is a hydraulic cylinder for operation, and 9 is an operating valve for operating a refueling valve. 10 is a hydraulic piston for operation, 10 is a movable contact for a power breaker, 11 is an accumulator for high-pressure oil storage, 12 is an oil pump, 13 is an oil tank, 14 is a high-pressure hydraulic pipe, 15.16 is a low-pressure oil pipe,
Reference numeral 17 indicates an oil pipe for operating the oil supply valve, and reference numeral 18 indicates an oil pipe for operating the operating hydraulic piston. In order to change from the cutoff state to the on state shown in FIG. 1, first operate the oil pump 12 to supply high pressure oil. When the pressure in the piping 14 and the accumulator 11 is increased, and then a closing signal is input, the closing electromagnetic coil 1 is energized thereby, and the closing valve 3 is actuated through the operation of the operation valve 4 for operating the closing valve. Then, the space between the valve seat and the valve seat is opened, and the space between the shutoff valve and the input valve operation valve and the valve seat is closed.

Therefore, the high-pressure oil in the high-pressure oil pipe 14 passes between the input valve 3 and its valve seat and enters the oil pipe 17 for operating the oil supply valve, which pushes up the operation valve 7 for operating the oil supply valve. 5 is lifted, the space between the oil supply valve 5 and its valve seat is opened, and the high-pressure hydraulic pipe 14, that is, the accumulator 11, and the operating hydraulic piston operating pipe 18 communicate with each other, and the high-pressure oil flows into the upper part of the operating hydraulic cylinder 8. The liquid flows into the hydraulic piston 9, acts on the head of the hydraulic piston 9, pushes the hydraulic piston 9 up, moves the movable contact provided at the tip of the hydraulic piston 9, and closes the hydraulic piston 9.

Next, in order to change from the closing state to the shutoff state shown in Fig. 2, when a shutoff signal is input, the shutoff electromagnetic coil 2 is energized, thereby operating the closing valve 3 and closing the gap between it and the valve seat. At the same time, push the operation valve for operating the shutoff valve and input valve to open the space between it and the valve seat.

Therefore, in order to cut off the flow path between the high-pressure oil pipe 14 and the oil pipe 17 for operating the oil supply valve, and to establish communication between the oil pipe 17 for operating the oil supply valve and the low-pressure oil pipe 15 that opens into the oil tank 13. The high-pressure oil in the lower part of the oil pipe 17 for operating the oil supply valve, that is, the operation valve 7 for operating the oil supply valve and the oil drain pipe 6, flows between the operation valve 4 for operating the shutoff valve and input valve, which is open, and its valve seat. The oil then flows out into the low-pressure oil pipe 15, that is, into the oil tank 13, and the upward pressure on the lower surface of the oil drain valve 6 disappears.

The high-pressure oil in the hydraulic piston operating oil pipe 18 acts on the upper surfaces of the oil drain valve 6 and the oil supply valve operating valve 7 while maintaining its high pressure. The operating hydraulic piston descends against the resistance of a spring provided between the chamber and the valve seat, creating a flow path between the operating hydraulic piston and the operating hydraulic pipe 18. By draining the oil into the oil tank 13 through the flow path between the oil drain valve 6 and its valve seat, the pressing force acting on the head of the operating hydraulic piston 9 is eliminated.

On the other hand, since the space between the input valve 3 and its valve seat is closed, the high pressure oil in the high pressure hydraulic pipe 14 flows into the lower part of the operating hydraulic cylinder 8 and hits the lower surface of the operating hydraulic piston 9 head. This acts to push up the operating hydraulic piston 9, thereby opening the movable contact 10 provided thereon and cutting off the electrical circuit.

Although the conventional device operates in this way, this gap 19 directly affects the response time of the movable contact 10 to the closing or breaking signal;
Not only is it extremely difficult to manufacture and assemble the fuel supply valve to a short constant size that always falls within the allowable fluctuation value of the opening/closing response time, but it is also difficult to set the resting position of the oil supply valve operation valve 7 to a constant position. is impossible, and therefore the opening/closing response time generally fluctuates beyond the allowable fluctuation value.

The object of the present invention is to provide a control valve for a hydraulic operating device that eliminates such conventional drawbacks.

In order to achieve the above object, the present invention provides a position setting spring between the oil supply valve operation valve 7 and the oil supply valve 5 or the oil drain valve 6 or the cylinder housing them. It is characterized by the fact that it has been provided.

Hereinafter, the present invention will be explained based on the accompanying drawings showing one embodiment thereof.

Figure 3 shows how the position setting spring 20 is connected to the oil supply valve operating valve 21.
This is an example in which the switch is installed between the drain valve 6 and the drain valve 6, and shows a state in which the switch is cut off.

In such a structure, the position setting spring 20
The fuel supply valve operating valve 21 is always raised when it is stationary, and therefore, the upper end of the fuel supply valve operating valve 21 is always in contact with the lower end of the fuel supply valve 5 when it is stationary. The refueling valve 5 is immediately activated by pressurizing the lower surface of the refueling valve operating valve 21 based on the inflow of high pressure oil from the refueling valve operating oil pipe 17 due to the operation of the electromagnetic coil 1.
The response time from the input of the closing signal to the closing electromagnetic coil to the actuation of the refueling valve 5 is always constant.

In addition, in this embodiment, the position setting spring 20 is provided between the oil supply valve operation operation valve 21 and the oil drain valve 6, but it is not installed between the oil supply valve operation operation valve 21 and the oil drain valve 6. There is no problem in providing the position setting spring 20 between the wall of the cylinder 22 that houses the refueling valve 5, the oil drain valve 6, etc. and the refueling valve operation valve 21, and its operation and effects are also as described above. It is exactly the same as the example.

Further, FIG. 4 shows an example in which the position setting spring 30 is provided between the oil supply valve operation valve 31 and the oil supply valve 32, and shows a state in which the switch is closed.

In such a device, since the position setting spring 30 always pushes down the oil supply valve operation valve 31 so that it is in contact with the oil drain valve 6 when it is at rest, the operation of the cutoff coil 2 Removal of high-pressure oil from the lower parts of the oil drain valve 6 and the oil supply valve operation valve 31, and the downward movement of the high-pressure oil in the operation hydraulic piston operation oil piping 18 based on the action on the upper surface of the oil supply well operation operation valve 31. The pressing force immediately acts on the oil drain valve 6, and therefore, the response time from the input of the cutoff signal to the cutoff electromagnetic coil 2 to the operation of the oil drain valve 6 becomes constant.

In addition, in the above example, the position setting spring 20 or 30
By providing only one of the two, the refueling valve operating valve 21.31 and the refueling valve 5 or the oil drain valve 31 are brought into contact with each other. The upper and lower stop positions of the valves 21, 31 are always constant, and the response operations in the case of the shutoff operation in the example of FIG. 3 and the closing operation in the example of FIG. 4 are of course constant and do not fluctuate.

Furthermore, in the above two examples, the position setting spring 20 or 3
0 was provided only on one side of the oil supply valve operation valve 21 or 31, but by using these together, it is provided on both the upper and lower sides of the oil supply valve operation valve 21 or 31, and the oil supply valve insertion operation valve is installed. 21 or 31 may be stopped at a position where both position setting springs 20 and 30 are in equilibrium without contacting the oil supply valve 5 and oil drain valve 6, so that the response time is kept constant and does not fluctuate. good.

In the above embodiment, the number of operation valves for operating the refueling valve is 1.
However, if necessary, it is also possible to use one or more of the above operating valves as the device of the present invention, and in this case, the same effect can be obtained. is obtained.

[Brief explanation of drawings]

1 and 2 are vertical cross-sectional explanatory diagrams showing the shutoff state and the closed state of a conventional hydraulic operating device, FIG. 3 is a vertical cross-sectional explanatory diagram showing one embodiment of the present invention, and FIG. 4 is a longitudinal cross-sectional diagram showing another embodiment of the present invention. It is a longitudinal cross-sectional view showing an example. 1... Electromagnetic coil for closing, 2... Electromagnetic coil for cutting off, 3... Closing valve, 4...
・Operation valve for operating shutoff valve and input valve, 5, 32...
... Oil supply valve, 6... Oil drain valve, ? , 21, 31・
...Operating valve for refueling valve operation, 8...Hydraulic cylinder for operation, 9...Hydraulic piston for operation, 2
0.30...Position setting spring, 22...
·Cylinder.

Claims (1)

[Scope of utility model registration request] an oil drain valve that opens and closes in response to pressure oil from an electromagnetic hydraulic valve to disconnect communication between the operating hydraulic cylinder and the low-pressure oil pipe;
an oil drain valve that opens and closes to disconnect communication between the operating hydraulic cylinder and the high-pressure hydraulic pipe; and an oil drain valve that is provided between the oil drain valve and the oil supply valve, and receives pressure oil from the electromagnetic hydraulic valve to supply the oil. A hydraulic operation comprising: a refueling valve operating valve that opens and closes the valve; and a position setting spring inserted between at least one of the oil drain valve and the refueling valve and the refueling valve operating valve. Control valve for equipment.