JPS6220122Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a hydraulic operating device for a chopper or disconnector.

Conventionally, when operating a shingle breaker using hydraulic pressure, it is equipped with a drive section consisting of a drive cylinder and a drive piston that open and close contacts of the opening/closing section, and a valve device that controls the drive section. This hydraulic drive unit is required to operate at extremely high speed, for example, with two cycles and a short cut. A typical hydraulic operating mechanism consists of a main valve, an amplification valve, and a pilot valve. First, an electromagnet operates the pilot valve to move the amplification valve, which is then amplified to operate the main valve and drive the drive piston. In this case, the electromagnet is used to operate the pilot valve.
ms, the total time from when the amplification valve, main valve and drive piston operate to when the contacts are closed and disconnected is 30ms.
It works in an extremely short period of time. The main valve is
Normally, liquid pressure is applied to the inflow side and the back pressure section of the valve body at all times and is balanced, and the valve is closed by the spring. When the back pressure part of the main valve body, that is, the pressure liquid in the pilot valve chamber, is released to the atmosphere, the main valve body opens at some point without losing its balance, and pressure liquid is supplied from the accumulator storing high pressure liquid to the drive cylinder, and the contact point is Opening and closing takes place.

Therefore, it is sufficient to have a pilot valve that opens the back pressure part of the main valve, that is, the pilot valve chamber, to the atmosphere, but in order to open and close the main valve instantly, it is necessary to instantly release the pressure fluid in the pilot valve chamber to the atmosphere. It is necessary to
Becomes a large diameter. Alternatively, when operating only with a pilot valve, an electromagnetic force of several hundred kilograms is required, resulting in a large electromagnet.

Also, insert the pilot valve 1 into the valve body 2 as shown in Figure 1.
If it is formed in such a way that the pressure is balanced, only the operating force equivalent to the force of the compression spring 3 is required, which can be done with a small electromagnet. Because there is
Normally, the contacts of the opening/closing part remain closed. Therefore, especially if there is a leakage of pressure fluid from the side opposite to the rod of the drive section, the drive piston becomes unstable. In Fig. 1, high pressure is applied to the constricted part of the valve body 2 of the pilot valve 1, so although the poppet 4 side is good, it leaks from the spool land 5 side and the hydraulic pressure decreases, causing the accumulated pressure in the accumulator. Since the fluid is discharged, there is a problem that the pump starts each time and accumulates pressure.

This invention was made taking the above points into consideration.
The object is to provide a hydraulic operating device for a shingle breaker that is simple and reliable and has a leak-free structure.

Hereinafter, the present invention will be described with reference to an embodiment shown in the drawings. In FIG. 2, a break section 11 of a switchgear, for example a break switch, has a fixed contact 12 and a movable contact 1.
This movable contact 13 is composed of an insulating rod 1
The drive piston 15 is connected to a drive piston 15 having a piston rod 16 which is connected to the drive unit 18 via the drive piston 15 and the drive cylinder 17.
is formed.

The shielding system of the operating device for driving and operating the drive section 18 is provided with a shielding main valve 20 in the valve box 19 and a compression spring 22 in the back pressure section 21. As a result, the exhaust pressure passage 52 communicating with the atmospheric pressure exhaust pressure tank 51 is slightly closed. This shingled pilot valve 30 has a core 61 and an electromagnetic coil 6.
2 and an armature 63.
0 armature 63.

The closing system is provided with a closing main valve 20A, a back pressure section 21A, a compression spring 22A, and a closing pilot valve 30A in the valve box 19 as described above, and this closing pilot valve 30A is connected to a closing solenoid section 60A.

The flow path of the pressure liquid supplied from the accumulator 50 is a flow path 53 that enters the rod side of the drive unit 18, and flow paths 54 and 55 that are closed by the main input valve 20A and the main cutoff valve 20. This flow path 55 is provided with a flow path 56 that leads to the opposite side of the drive section 18, and the main valve 20 is connected to an exhaust pressure path 57 that leads to the exhaust pressure tank 51.
Closed. Furthermore, a small hole 23 communicating with the back pressure part 21 and the flow path 56 is formed in the main cutoff valve 20, and a sliding packing 24 is provided between the main cutoff valve 20 and the valve box 19. A small hole 23A communicating with the back pressure portion 21A and the flow path 54 is formed in the main valve 20A.

In FIG. 3, the back pressure part 21 of the main valve 20
An exhaust pressure passage 52 communicating with an exhaust pressure tank 51 is closed by a poppet 31 of a pilot valve 30. The poppet 31 of the shear pilot valve 30 is constantly pressed by a compression spring 32 between it and the spring support member 25.
A spool 33 is formed at the other end, and a pilot valve space 3 between the poppet 31 and the spool 33 is formed.
4 is opened by an exhaust pressure path 52 communicating with an exhaust pressure tank 51. A communication hole 36 is formed in the center of the shield pilot valve 30 to communicate with the back pressure section 35 and the back pressure section 21 of the shield main valve 20. It is opened by a pressure path 58. A ball valve 38 is provided at the other end of a compression spring 37 whose one end is fixed in the communication hole 36 of the shingle pilot valve 30, and is always tightly closed with the back pressure part 35 of the shingle pilot valve 30. There is. The armature 63 of this ball valve 38 and the disconnection solenoid part 60
As shown in FIG. 3, the vicinity of the ball valve 38 of the ball valve rod 39 integrated with the ball valve 38 communicates with the exhaust pressure path 58 when the ball valve 38 is closed, and communicates with the exhaust pressure path 58 when the ball valve 38 is open. A cutout groove 40 is formed such that the cutout groove 58 is closed. The closing pilot valve 30A of the closing system of the closing main valve 20A is also constructed in the same manner as described above.

Next, the effects of the configuration of the present invention will be explained. Briefly, as shown in FIG. 2, when the insulating solenoid section 60 is energized by the insulating disconnection command, the insulating pilot valve 30 opens, and the back pressure section 21 of the insulating main valve 20 opens. is opened to the atmosphere through the space 34 of the pilot valve 30. Therefore, the main valve 3
0 descends downward, passes through a flow path 56, and the opposite side of the drive section 11 to the rod is opened to the exhaust pressure tank 51. At this time, since the pressure fluid of the accumulator 50 is supplied from the flow path 53 to the rod side of the drive part 18, the drive piston 15 rapidly descends, and the piston rod 1
The movable contact 13 connected to 6 is opened, and the shear section 11 is sheared.

In the case of closing, the main closing valve 20 remains closed and the main closing valve 20A does not open, so pressurized fluid is supplied to the rod side and the anti-rod side of the drive piston 15 of the drive unit 18. The drive piston 15 receives pressure in an area corresponding to the cross-sectional area of the piston rod 16.
rises, and the movable contact 13 is closed.

Furthermore, in FIG.
It communicates with the flow path 56 by. Siya disconnect main valve 2
0 is provided with a sliding packing 24, and the back pressure section 21 maintains high hydraulic pressure. However, since the main input valve 20A on the input side does not have a flow path communicating with the atmosphere, sliding packing is not necessary.

Referring to FIG. 3, the shearing operation will be explained in detail again. When a shearing command is issued and the shearing electromagnetic section 60 is energized, the armature 63 is attracted and the ball valve rod 39 moves. At this time, ball valve rod 3
The tip of 9 pushes up the ball valve 38 against the compression spring 37. Therefore, the pressure liquid in the back pressure part 21 of the main shutoff valve 20 flows into the back pressure part 35 of the pilot valve 30 through the communication hole 36, and the pilot valve 30
The ends of the spool 33 and the spool 33 receive pressure and are balanced. Therefore, it receives only the force of the compression spring 32, but the ball valve rod 39 rises against this, so the thick part of the ball valve rod 39 with the groove 40 pushes the bottom of the spool 33, causing it to break. The pilot valve 30 is pushed up, the poppet 31 is opened, and the back pressure section 21 of the main valve 20 is opened to the exhaust pressure tank 51 via the flow path 52. Then, when the balance is lost, the main disconnect valve 20 moves downward and opens, and the pressure fluid on the anti-rod side of the drive section 18 is released, so that the drive piston is suddenly moved from the top, that is, by the pressure fluid on the anti-rod side. It moves downward to open the movable contact 13 and break it.

In addition, in FIGS. 3 and 4, when the shield solenoid valve 60 is demagnetized, the shield pilot valve 30
is pushed down by the compression spring 32. When the liquid in the back pressure part 35 of the spool 33 of the shielded pilot valve 30 is energized, the ball valve rod 39 rises and the liquid flows into the notch groove 40.
Since the part without the blank is in contact with the valve box 19, it is sealed and the pressure is increased. Then, when demagnetized and the ball valve 38 descends, the ball valve rod 39 descends downward and the notch groove 40
is opened to the exhaust pressure tank 51 via the flow path 58, so the back pressure part 35 becomes atmospheric pressure, and the back pressure part 2 of the main valve 20 is released by the poppet 31 and the ball valve 38.
1 is sealed. Furthermore, at this time, the disconnection main valve 20
The pressure liquid flows into the back pressure part 21 from the small hole 23 made in the
Since the port 1 that closes is much larger, the pressure in the back pressure section 21 decreases.

In addition, if the valve body of the shielded pilot valve 30 is made with a difference in the seat diameter of the poppet 31 and the diameter of the spool 33, the difference in area of the valve body can be achieved by simply pushing up the ball valve 38 by the shielded solenoid section 60. Opening the shutoff pilot valve 30 has the advantage that it is quick, does not require much electromagnetic force, and does not require two-stage operation using electromagnetic force.

Furthermore, FIG. 5 shows another embodiment of the present invention.
The same parts as in FIG. 3 are given the same symbols. In FIG. 5, the conical valve 70 is connected like a stopper to the pilot valve 3.
If a poppet is formed in the communication hole 36 of the communication hole 36 of 0, a shear cut pilot valve 30 that moves rapidly can be obtained. Its action is that the conical valve 70 is compressed by the compression spring 7.
The force of 1 is overcome by the force obtained by multiplying the cross-sectional area of the communication hole 36 by the hydraulic pressure, and the communication hole 36 is closed. The armature 63 is absorbed by the shield solenoid 60 to open the conical valve 70. When the conical valve 71 opens a little in this way, the valve body rises rapidly and opens by itself. Further, there is an advantage that the stroke of the conical valve 70 is small.

According to the configuration of the present invention described above, the pressure liquid on the side opposite to the rod of the drive section 18 always flows through the flow path 56 and the back pressure section 2.
1 and is closed by the packing 24, poppet 31, and ball valve 38, and there is no leakage. That is, since there is no part like the spool 33 that is sealed only by fitting, there is an advantage that leakage can be reduced. Note that if a packing is provided on the spool 33, the ball valve 38 becomes unnecessary and it is only necessary to communicate the back pressure part 21 and the back pressure part 35. However, packing such as an O-ring, for example, may
This impairs the movement of the valve body driven by the electromagnet.
That is, in the case of three phases, when each phase is cut off, if a valve is provided for each phase, an imbalance will occur and the timing will not match, so there is a possibility that the shearing cannot be cut off. Pressure fluid also flows into the back pressure section 35 at the bottom of the pilot valve 30, but at this time, it is the moment when the shearing operation is performed, and it is sufficient to return the leaked fluid to the drain. be.

Next, with this configuration, the electromagnet is extremely small, it is easy to obtain an electromagnet with good characteristics, and moreover, it is possible to operate rapidly with a small electromagnetic force.
Now, if only the poppet valve is direct-acting, and the valve seat diameter of poppet 31 is 10 mm, the hydraulic pressure will be 350 kg/
cm ² requires an electromagnetic force of 300 kg, making the electromagnet extremely large. However, if this is made into a balanced type as in the present invention, the electromagnet needs only the force to overcome the force of the compression spring, and furthermore, by setting the diameter of the poppet 31 of the valve body and the spool 33 to be larger, the diameter of the latter can be set larger. , the force of the spring can be included and balanced. The force required to push up the ball valve 38 is, for example, 2 mm when the valve seat diameter is 2 mm.
If the hydraulic pressure is 350Kg/cm ² , it will be 10Kg, and in this way the electromagnet can be kept small.

As explained above, according to the configuration of the present invention,
It is installed in a valve box with reduced piping, and the ball valve that balances the pressure is opened just before the first stage is operated.
Next, by opening the valve body of the pilot valve in two steps, we have a pilot valve that is always leak-free, is balanced, and requires little operating force, and the valve mechanism consists of only the main valve and pilot valve. Since the amplification valve can be omitted, it is possible to provide a hydraulic pressure operating device for a shroud breaker that can be easily configured and has no leakage and is reliable.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the main parts of a conventional hydraulic operating device, Figs. 2 to 4 are sectional views showing the main parts of the hydraulic operating device of the present invention, and Fig. 4 is similar to Fig. 3. FIG. 5 is a sectional view showing main parts of another embodiment of the present invention. 11...Shining section, 12...Fixed contact, 13...
...Movable contact, 14...Insulating rod, 15...Driving piston, 16...Piston rod, 17...Driving cylinder, 18...Driving section, 19...Valve box, 2
0...Shiya disconnection main valve, 20A...Input main valve, 21...
...Back pressure part, 21A...Back pressure part, 22...Compression spring, 22A...Compression spring, 23...Small hole, 24...
...Sliding packing, 25...Compression spring support member,
30...Folding pilot valve, 30A...Input pilot valve, 31...Poppet, 32...Compression spring, 33...Spool, 34...Space, 35...
...Back pressure part, 36...Communication hole, 37...Compression spring,
38... Ball valve, 39... Ball valve rod, 40... Notch groove, 50... Accumulator, 51... Exhaust pressure tank, 52, 57, 58... Exhaust pressure path, 53, 5
4, 55, 56...Flow path, 60...Shipping solenoid section, 60A...Inserting electromagnetic section, 70...Conical valve.

Claims (1)

[Scope of utility model registration request] An opening/closing section consisting of a fixed contact and a movable contact, a drive section consisting of a drive cylinder and a drive piston that drive the movable contact, an accumulator that supplies pressurized fluid to the rod side and anti-rod side of this drive section, and this pressure A dosing valve system consisting of a main dosing valve that tightly closes the liquid, a dosing pilot valve that closes between the back pressure part of the main dosing valve and the exhaust pressure tank, and the pressure on the rod side of the drive section. A shield breaker consisting of a shield main valve that tightly closes between the liquid and the exhaust pressure tank, and a shield pilot valve that tightly closes between the back pressure part of the shield valve and the exhaust pressure tank. A valve system is provided, and the closing valve system and the closing valve system are incorporated into a valve box, and each of the pilot valves is a poppet for closing the pressure fluid between the respective back pressure section and the exhaust pressure tank. A ball valve that closes the pressurized liquid to the spool side of a communication hole that passes through these, a plunger that presses this ball valve to open it, and an electromagnetic part that operates this plunger. A hydraulic operating device featuring: