JPS59158026A - Hydraulically operating circuit for breaker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a high voltage large
The present invention relates to a hydraulic operation circuit for a diversion breaker.

General: This type of hydraulic operation circuit uses a hydraulic cylinder that operates the breaker, and a pressure of 7m' for operation in the hydraulic cylinder.
It consists of a main valve that sends r, an operating valve that sends operating pressure oil to the main valve, a closing solenoid valve that drives the operating valve, and a shut-off solenoid valve.

The hydraulic operating circuit VC is provided with a self-holding mechanism.

The self-holding mechanism maintains the closed state of the hydraulic cylinder using pressure oil flowing through the hydraulic circuit, and prevents the contactor of the breaker from inadvertently moving from its closed position.

Figure 1 shows a self-holding mechanism installed on the side of the operating valve (4). It is mainly composed of first and second hydraulically operated switching valves (12/X 12x), which are a type of 3-point/2-position switching valve having , A boat, and R port, and the first hydraulically operated switching valve (12/X 12x). A valve (12/) and two operation chambers (16/) (16a) are provided.

That is, the first hydraulically actuated switching valve (12/) U, a conduit from the closing solenoid valve (5) is connected to one operation chamber (16/), and a line from the closing solenoid valve (5) is connected to the other operation chamber (16-). A branch pipe of the pipe connecting the A boat and the main valve (3) is connected to a second hydraulically operated switching valve (
12).

Then, when the closing solenoid valve (5) is energized, pressure oil flows into the operation chamber L16/), causing the operation piston α0 to move to the left, and the ball valve 03 opens between the P port and the A boat, and the pressure source α Pressure oil sent out from the hydraulic pressure is sent to the main valve (3) and the P port of the second hydraulically operated switching valve (12, z).

The main valve (3) is supplied with the above pressure oil to the hydraulic cylinder (
(not shown) to set the breaker contactor (not shown) to the closed position.

On the other hand, the pressure oil sent to the P boat of the second hydraulically operated switching valve (12) is sent to the operation chamber (16λ) of the first hydraulically operated switching valve (12/) via the P port 1--A boat. Enter and continue to press the operating piston α0 to the left.

Therefore, the closing solenoid valve (5) is demagnetized and the operation room (
Even if the pressure oil in the control room (16/) is released to the reservoir,
Since the pressure oil in the main valve (3) retains the position at 7, the operation piston α0 remains moved to the left, and as a result, the main valve (3) also retains pressure oil, and the breaker is activated. The closed state will be maintained by itself.

However, with such a self-holding mechanism, as long as the pressure of the pressure source αη (hereinafter referred to as system pressure) is always normal, no problem will occur. For example, if the pressure drops due to an oil leak from the pressure source, and the cause is removed and the system pressure is raised again, the breaker will not be able to maintain the closed state before the system pressure dropped, and the system pressure will gradually increase. As the state recovers, a problem arises in that even if a cutoff command is given, the breaker gradually shifts to the cutoff state.

That is, when the system pressure decreases, the operation chamber (16/) for self-maintenance of the first hydraulically operated switching valve (12/)
Since the pressure at v) also decreases, the operating piston α0 returns to the right direction, and the ball valve α closes the connection between the P boat 1 and the A boat. Therefore, even if the system pressure is increased again, pressure oil is not supplied to the main valve (3).

In the meantime, two methods have been proposed as solutions for (J).

The first method (g): When the system pressure drops, the operating piston is mechanically clamped to prevent it from returning to the right, and when the system pressure rises again, pressure oil is supplied to the main valve. The second method attempts to maintain the closed state of the breaker by mechanically clamping the piston rod of the hydraulic cylinder that directly operates the breaker when the system pressure decreases. be.

However, in all of these methods, a clamping device with a robust and complicated structure must be provided to clamp the operating piston Q6) or piston rod against the hydraulic pressure generated when the system pressure rises again. However, there were also problems with the reliability of this clamping device.

The present invention was developed in view of the above-mentioned circumstances, and is designed to reduce pressure when the system pressure abnormally decreases below the set pressure A first pressure control valve is provided which releases the oil into the reservoir and releases the pressure oil when the pressure is restored to 27 or more.
Hydraulically operated switching valve (1, 2/) K self-holding piston 0
0 is provided, and the third operation chamber and the pressure source 07 are provided.
), and in the middle of this pipe, in conjunction with the piston rod F of the hydraulic cylinder (2), pressure oil flows when the circuit breaker (1) is closed, and pressurized oil flows when the circuit breaker (1) is closed. Set pressure P of the switching valve that opens to the reservoir and the first pressure control valve / Set pressure PJ set higher than (I
By providing a second pressure control valve that flows pressure oil when the C system pressure drops abnormally and releases the pressure oil to the reservoir when it recovers to 92 or higher, it is possible to prevent abnormal system pressure while the circuit breaker (1) is closed. Pressure oil flows through the new pipe line only when the pressure is low and is supplied to the third operation chamber of the self-holding piston α0, and when the system pressure rises again, the pressure oil is supplied to the third operation chamber δ. The self-holding screw 1-aO is pushed to the left by the system pressure itself, and the system pressure recovered by opening the P boat and A boat is restored to the main valve (
3) By providing a hydraulic operating circuit for a circuit breaker capable of shutting off the supply, the above-mentioned problems of the conventional art are attempted to be solved at once.

Hereinafter, the present invention will be described in detail based on the accompanying drawings.

In Fig. 2, (1) is a power breaker, (a hydraulic cylinder that operates the 2-inch breaker (1), (3) a main valve that sends pressure oil for operation to the H hydraulic cylinder (2), (4)
E Operation valve that sends operating pressure oil to the main valve (3), (5) and (
6) shows the operating valve (4) the fully driven closing solenoid valve and cut-off solenoid valve, and d→ shows the accumulator.

In addition, (c) is a first pressure control valve provided in the middle of the pipe connecting the above-mentioned parts, that is, the operating circuit and the pressure source θ that supplies pressure oil to the operating circuit. (4) A second pressure control valve is installed in the middle of the pipeline (c) that directly connects the operation chamber (a) of the first hydraulically operated switching valve (12/) and the pressure source αη. , @represents the switching valve, respectively.

3 with P port, A boat, and R boat on main valve (3)
A type of port 2 position switching valve, the poppet valve (7) controls the opening and closing between the P port and the A boat.
Piston (8), operation chamber 00, A of operation piston (8)
It is composed of a poppet valve (9) etc. that controls opening and closing between the boat 1 and the boat R. Set the hydraulic cylinder (2) to the P boat.
Connect the rod side of the rod and the accumulator (11),
It is connected to the bore side of the A boat H hydraulic cylinder (2).

The main body of the operation (4) is the first and second double-side pressure-operated switching valves (12/) (12x), which are a type of 3-point/2-position switching valves that have a P port, an A boat, and an R boat. The structure is broken.

First hydraulically operated switching valve (12/) u P port 1--A
Poppet valve (c), which controls opening and closing between port 1 and A)
Poppet valve (c) that controls the opening and closing between the R boat parts, self-holding piston α■ for operating the poppet valve (a), and self-holding h.

Two control rooms (1, 6/) (16, 2) of Su I.70
, a third operation chamber (A) equipped with a piston (G) for suppressing the self-holding pinuton α0, etc.

This port ↑ (12/) is connected to the pressure source θ'7) through the first pressure control valve (c), and the A port is connected to the control chamber outlet of the main valve (3). There is. A pipe is branched halfway between this A boat and the control room (IL) of the main valve (3), and is connected to the P boat of the second hydraulically operated switching valve (122).A reservoir is connected to the R boat. The conduit from the control room (16/) to the solenoid valve (5) is connected, and the A of the second hydraulically operated switching valve (12, 2) is connected to the control room (16j). Connected to the boat, the control room (A) is connected to a pressure source α via a switching valve (A) and a second pressure control valve (A).

The second hydraulically operated switching valve (12, 2) has a poppet valve (c) that controls opening and closing between the P boat and the A port and an opening and closing between the A boat and the R port, and an operation pinuton (I) of the poppet valve (c). '
ll, operation pinuton θ two operation rooms (a), etc. It is connected to the R port reservoir of this valve (12, 2), and the conduit from the cut-off solenoid valve (6) is connected to the operation chamber cover.

The first pressure control valve (c) connects the pressure source a to the pipe line (operation circuit) connecting each part of the operation valve (4), both solenoid valves (5), (6), and accumulator 01). A pipe is installed in the middle of the pipe, and when the system pressure drops below the set pressure P, it becomes the E position and releases the pressure oil in the operating circuit to the reservoir, and when the system pressure recovers to 27 or higher, the pilot pipe opens. It operates by switching to the position by pressure oil from (2) and supplying pressure oil to the operating circuit.

The second pressure control valve (a) and the switching valve @ are provided in the middle of the pipe line 02□□□ which directly connects the pressure source (17) and the operation chamber of the first hydraulically operated switching valve (12/). ing.

That is, the second pressure control valve (c) is branched in the middle of the pipe connecting the pressure source α force and the first pressure control valve (c), and the downstream boat of the switching valve (a) is connected to the second pressure control valve (c). Conduit 0 connected to 8
), and when the system pressure decreases below the set pressure P which is higher than the set pressure P of the first pressure control valve (c), it becomes the C position and all pressure oil pipes have zero force. When the system pressure recovers to 92 or more, the pressure oil from the pilot line (G) switches the system to the D position and releases the pressure oil to the reservoir.

The first port is connected to the secondary boat of the switching valve (5) via the pipe (G).
The switching valve @, which is connected to the operation chamber of the hydraulically operated switching valve (12/), switches in conjunction with the Pierton rod of the hydraulic cylinder (2), and when the piston rod extends, that is, when the breaker (1) When the piston rod is retracted, that is, when the circuit breaker (1) is shut off, the i4A position is set to supply pressure oil to the operation chamber, and the B position is set to supply pressure oil from the operation chamber to the pipe (Ha ) and then released into the reservoir.

Next, the operation of this hydraulic operation circuit will be explained.

FIG. 2 shows a case where the circuit breaker (1) is in a disconnected state. In this state, when the pressure oil from the pressure source α force, that is, the system pressure, is normal, the first pressure control valve (c) is in the F position, the second pressure control valve (a) is in the D position, and the switching valve is in the D position. After switching to the B position, the system pressure is adjusted by connecting the P port of the first hydraulic operation switching valve (12/), both solenoid valves (5) and (6), and the accumulator (
1]) etc.

Therefore, when the closing solenoid valve (5) is fully energized, the pressure oil from this valve (5) is transferred to the first hydraulically operated switching valve (12/
) is supplied to the operation chamber (16/) of the self-holding piston θ
to the left, the poppet valve closes the connection between the A boat and the R port, and at the same time the poppet valve opens the connection between the P boat and the A boat, transferring system pressure to the control room of the main valve (3). θO and the P boat of the second hydraulically operated switching valve (12p).

The operation chamber (If) of the main valve (3) Pushes the operation piston (8) to the left side to the system pressure supplied by VC, and the main valve (3)
(P baud) and A boat are opened.

Hydraulic cylinder (2) Since the pressure receiving area is larger on the Nirondo side and on the Siboa side, the pressure oil of the accumulator α force is absorbed by the open box between P port 1 and A port.
This oil flow moves the piston inside the cylinder (2) to the left, and the contact at the tip of the rod of the piston is set to the closed state.

At this time, the switching valve @ is switched to the A position.

When the piston moves to the left, the pressure on the bore side of the cylinder (2) becomes the same as the pressure in the accumulator 0η and the operating chamber Q0 of the main valve (3), the oil flow stops υ, and the operating pinuton (8) and The force of the poppet valve (7) vs. the nupling Q0 returns it to the right side, and the gap between P-boat and P-boat is closed. In this case, the poppet valve (9) remains held at the left stroke end by the null ring @.
Since there is one C, the circuit will not be connected to the low pressure side when driving the hydraulic cylinder (2).

In addition, the system pressure that is branched from the A port of the first hydraulically operated switching valve (121) to the P boat of the second hydraulically operated switching valve (122) is supplied to the first hydraulically operated switching valve (12) through the A port of the valve (12). Operation chamber (16, 2) of the hydraulically operated switching valve (12/)
, and press the self-holding piston α [with] further to the left.

This series of operations completes the closing operation of the breaker (1), but in the middle of the closing operation, the closing solenoid valve (5)
can be demagnetized. This degaussing valve (5) returns to the right side by the Uy ring, and the pressure oil in the operation chamber (16/) of the first hydraulic operation switching valve (12'/) returns to the reservoir, but the operation chamber ( 16, 2) is held as is, the self-holding piston α [with] is moved to the left. In other words, despite the demagnetization of the closing solenoid valve (5), the breaker ( 1) continues to maintain the closed state.

Next, a description will be given of the circuit operation when the system pressure decreases in the closed state of the breaker.

For example, if an oil leak occurs in one pressure source and the system pressure decreases, the pressure in the entire operating circuit decreases, and the main valve (
3) The pressure in the operation chamber (10) also decreases, but the pressure in the poppet valve (
9) is held on the left side by the force of the spring (A), so the piston rod of the hydraulic cylinder (2) is also maintained in the closed state.

When the system pressure decreases to below the Pco pressure, the second pressure control valve (C) is switched to the C position by spring action, and pressure oil flows into the pipe line 0. The pressure oil flowing through the pipe line 0 passes through the switching valve @, is supplied to the operation chamber of the first hydraulically operated switching valve (12/) via the pipe (c), and is supplied to the operation chamber of the first hydraulically operated switching valve (12/). Press the self-holding pin 1 θ to the left.
Push the phrase to the left.

When the system pressure further decreases to below P/, the first pressure control valve (c) is switched to the E position by the null ring operation, the pressure oil supplied to the operating circuit is closed, and the vserver is closed.
The system is open to z<-. At this time, if pressure oil from pressure source 07) remains, the pressure oil from pressure source 07 is passed through pipe 0 to 0 to the operation room (
However, the piston rod of the cylinder (2) remains closed without affecting the operation of the hydraulic cylinder (21).

When the cause of the system pressure drop is resolved and the system pressure begins to rise again, the pressure oil is guided to the control room via pipe 0, piston ■ moves to the left, and self-holding piston 09 moves to the left. can be suppressed. In this way, the function in the active state is configured. At this time, since the first pressure control valve (c) remains in the HE deposition position and is not operating, pressure oil is not supplied to the operating circuit.

When the system pressure increases and exceeds P/pressure, the first pressure control valve (A) switches to the F position, and pressure oil is supplied to the operating circuit. At this time, the self-holding piston a0 has already moved to the left and has the function of closing state.
The pressure oil flowing into the operation circuit is connected to the hydraulic cylinder (2) and the main valve (
3) operation chamber α0 and the first hydraulically operated switching valve (12/
) is simultaneously supplied to the self-holding operation chamber (16r). Therefore, the piston rod of the hydraulic cylinder (2) does not move in the cutoff direction.

When the system pressure further increases and exceeds the P2 pressure, the second pressure control valve (c) switches to the D position, closing off the pressure oil flowing to the pipe 0 wharf and opening it to the reservoir. As a result, the piston (to) in the operation chamber (a) has a spring of 0.
]) The force pushes it back to the right, but the self-holding piston 00
The pressurized oil supplied to the operation room (162) already constitutes a self-holding function, and it is strongly pushed to the left.

Therefore, even if the system pressure drops abnormally when the breaker (1) is in the closed state, the breaker does not shift to the cutoff state, and the self-holding function is restored as the system pressure recovers. The closed state will continue to be maintained from beginning to end.

When changing the on state of the breaker (1) to the off state, the breaker solenoid valve (G) is energized.

When the block solenoid valve (6) is energized, pressure oil is supplied to the operation chamber cover of the second hydraulically operated switching valve (12y).

The operation piston (one of them) is moved to the left by the pressure oil supplied to the operation chamber (A), and the poppet valve (4) is fully opened, so that it moves inside the operation chamber (16λ) of the first hydraulically operated switching valve (12/). The pressure oil is the A port of the second hydraulic operation switching ヅ↑(12λ))
-Recovered to the reservoir via R boat. Then, the self-holding piston aO moves to the right side by the spring force, and the pressurized oil in the operation chamber of the main valve (3) flows into the reservoir via the A port and R port of the first hydraulically operated switching valve (12/). As a result, the poppet valve (9) of the main valve (3) rapidly moves to the right against the force of the Q nubling (a) due to the pressure of the pressure oil stored in the bore side of the cylinder (2). , open the R port and collect the pressure oil on the bore side of the cylinder (2) into the reservoir. Pressure oil from the Kid accumulator on the rond side of the cylinder (2) is constantly supplied, so When the pressure oil on the bore side is collected into the reservoir, the piston of the cylinder (2) rapidly moves to the right, and in conjunction with this, the contact of the breaker (1) moves from the closed state to the closed state. At the same time, the switching valve (A) switches to the B position, and the pressure oil in the operation chamber (E) is collected into the reservoir. In this way, the shutoff operation is completed.

When the shutoff operation is completed, the bore side of the cylinder (2) becomes atmospheric pressure, and the poppet valve (9) of the main valve (3) returns to the left side by the force of the spring (A), and the A of the main valve (3) returns to the left side. Close the boat and R boat and prepare for the next injection command.

Next, the operation when the system pressure decreases in this cutoff state will be explained.

When the system pressure decreases in the shut-off state and becomes below the P2 pressure, the second pressure control valve (A) switches to the Hc position and pressure oil is supplied to the 0 side of the channel, but the switching valve @ switches to the B position. ), here the pressure oil block σre, the pipe line (g),
Not supplied to the control room (c). Therefore, the control room (a)
The self-retaining piston (a) is in the state where it is fully pushed to the right by the screw latch (a) inside the screw l (A), and the self-retaining piston is in the state where it has moved to the right (i.e., it is in the cutoff state).

If the system pressure further decreases to below P/pressure, the first
The pressure control valve (c) is switched to the E position, and the pressure oil supply to the operating circuit is interrupted, so the cut-off state can be maintained.

When the pressure source (1) is restored and the system pressure rises, the pressure oil first flows to the 0 side of the pipe, but this pressure oil is discharged here because the switching valve is located at the B position. At this time, the first pressure control valve (a) remains in the E position, so the supply of pressure oil to the operating circuit is locked.Therefore, the self-holding pin has moved to the right at 120, and is shut off. in a state.

When the system pressure rises and exceeds P/pressure, the first pressure control valve (c) switches to the F position and pressure oil is supplied to the operation circuit, but the pressure oil to the operation valve (4) is The operation chamber (Ic) of the main valve (3) is blocked by the poppet valve (c).
I can't supply it. Therefore, the cylinder (2) does not operate and remains in the cut-off state.

When the system pressure rises further and reaches P pressure,
The second pressure control valve (A) is switched to the D position, and the pressure oil to the line 0 is blocked, and at the same time it is opened to the 2 reservoir of the line 0, so the switching valve (5) is switched to the A position. , B No matter where the pressure oil is in the operation chamber (a), it remains pressed to the right side by the force of the piston (to) null ring Gυ in the operation chamber pane, without being supplied to the operation chamber (a). Continue to do so. Therefore, the self-holding piston α5i1H does not move to the left, and the shut-off state is maintained throughout until the system pressure is restored to normal and the next closing command is received.

As explained above, in the present invention, the hydraulically operated circuit breaker equipped with a self-holding mechanism on the operating valve side loses its self-holding function when the system pressure decreases while the breaker is closed. , the problem that it is impossible to supply pressure oil from the operation valve to the main valve even if the system pressure rises again has been solved.
An operation chamber (A) equipped with a piston (■) for self-retention piton suppression is provided on the back of the self-retention piston 0Fil, and a second What is the pressure control valve (c) and switching valve (a)? When the system pressure is below the set pressure Pp in the closed state, pressure oil is supplied to the operation chamber to maintain the self-holding function, and in the cutoff state, the pressure oil f block is supplied to the operation chamber I20 regardless of the system pressure box. and maintain the cutoff state,
A first pressure control valve (c) is provided in the middle of the pipe connecting the pressure source 07) and the operating circuit to supply pressure oil to the operating circuit at a set pressure 27 or higher, which is lower than the system pressure 111 P-2. After the self-holding piston completes its closing movement to the left when it rises again after the pressure drops, pressure oil can be supplied to the operating circuit, so the hydraulic cylinder (
2) can be prevented from malfunctioning from the closed state to the cut-off state, and there is no need to incorporate a complicated clamping device into the circuit as in the conventional case. Therefore, the structure of the entire hydraulic circuit is simplified, reliability is increased, and excellent effects such as reduction of conuts can be expected.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram illustrating a conventional hydraulic operating circuit in which an operating valve is provided with a self-holding mechanism, and FIG. 2 is a circuit diagram illustrating a hydraulic operating circuit according to the present invention. 1: Breaker, 2: Hydraulic cylinder, 3: Main valve, 4: Operation valve, 5: Closing solenoid valve, 6: Shutoff solenoid valve, 7, 9, 23, 24, 28: Poppet valve, 8.
19: Operation Pinun, 10,167.164,20.
29: Operation room, 11 near-accumulator, 12/: 1st hydraulic operation switching valve, 12.2: 2nd hydraulic operation switching valve, 1
3,14. . 18: Bo/”-i'f, 15: Self-holding piston, 1
7: Pressure source, 21.22.81 Nispring, 25:
1st pressure control valve, 26: 2nd pressure control valve, 27: switching valve, 30: piston, 32, 33: pipe line, 34.85
: Pilot pipeline applicant Sumitomo Precision Industries Co., Ltd.

Claims (1)

[Claims] (1) Hydraulic cylinder (2) that operates the breaker (1)
and a main valve (3) that sends pressure oil for operation to the hydraulic cylinder, a first hydraulically operated switching valve (12/), and a second hydraulically operated switching valve (12x), and the main valve (3) ), the first hydraulically operated switching valve (12/
) with three operation rooms (16/X16.2) (a),
The closing solenoid valve (5) is installed in one operation room (16/).
) and connect the hydraulic line from one operation room (1
6x), the branch pipe of the hydraulic pipe leading to the main valve (3) is shut off, and the second hydraulically operated switching valve (12, 2) f- is connected to the hydraulic pipe from the Shingetsu solenoid valve (6). connect via
It is attached to the hydraulic cylinder (2) in another operation room (a), and is linked to the piston rond of the cylinder to allow pressure oil to flow when the circuit breaker (1) is in the closed state, and to flow the pressure oil when the circuit breaker (1) is closed. In addition to connecting the hydraulic line from the secondary port of the switching valve (c) that releases oil to the reservoir, system pressure is also connected to the hydraulic line connecting the operating valve (4) and the pressure source α. A first pressure control valve (c) is provided which operates to release the pressure oil to the reservoir when the pressure decreases to below P/, and to flow the pressure oil when the pressure recovers to 21 or more. A set pressure P higher than the above-mentioned P/2 is branched from the middle of the hydraulic pipe connecting the pressure source α force with The system is equipped with a second pressure control valve (c) that operates to flow pressure oil when the system pressure decreases and release the pressure oil to the reservoir when the system pressure recovers to 22 or more. Hydraulic operating circuit.