KR100346091B1 - Apparatus for driving fluid pressure in breaker - Google Patents

Abstract

The present invention is to obtain a fluid pressure drive device of a circuit breaker which can prevent the pumping operation to repeat the opening and closing of the contact, the anti-pumping mechanism is small, inexpensive, and excellent in controllability.

To this end, the contactor opening and closing piston (5) for opening and closing the contactor (1, 2) and a control valve mechanism for operating the same, the control valve mechanism has a switching valve 13 and the switching control valve, the switching valve (13) ) Is connected to switch the pressure on the cylinder operating chamber 7 of the contactor opening and closing piston 5, and the changeover control valve is a circuit breaker having a closing changeover control valve 39 and an opening changeover control valve 37. An anti-pumping piston 42 which is a fluid pressure drive device and performs an operation of closing the check valve 41, between the secondary side of the closing control valve 39 and the primary side of the check valve 41. The middle of the pipe connected to the fluid return side is connected to the anti-pumping piston operating chamber 44.

Description

Fluid pressure drive of breaker {APPARATUS FOR DRIVING FLUID PRESSURE IN BREAKER}

The present invention relates to a fluid pressure drive device of the circuit breaker, and is particularly suitable for the fluid pressure drive device of the power circuit breaker.

Power breakers installed in order to protect the power supply system in an emergency such as lightning strikes require very fast opening and closing operations.However, situations that require breaking operations are very rare. It is necessary to operate at high speed. For this reason, there is a possibility that the valve body may stick or the like due to any factor during long-term stoppage, and it may not work normally. This is particularly likely to occur in a pilot circuit with a small operating force. During the abnormal operation, in particular, the pumping operation of returning to the input state as it is after the interrupting operation or repeating the interrupting and closing operation is most undesirable due to a large load mechanically and electrically.

A fluid pressure drive device of a conventional circuit breaker includes, for example, a contact opening / closing piston for opening and closing a contactor and a control valve mechanism for operating the contact opening / closing piston as described in Japanese Patent Laid-Open No. 9-92096. The control valve mechanism has a switching valve and a switching control valve, and the switching valve is connected to switch the pressure on the cylinder operating chamber of the contactor opening and closing piston, and the switching control valve is a closing switching valve and an opening switching valve. In the closed switching control valve, the primary side is connected to the fluid supply side, the secondary side is connected to the switching valve pilot chamber of the switching valve via a check valve, the check valve is a switching control valve for closing in the switching valve pilot chamber It is installed to close the flow of water, and the switching valve for open circuit is connected to the pilot valve and the primary side is connected to the fluid return side. An anti-pumping mechanism is provided between the secondary side of the air vent switch control valve and the primary side of the check valve to connect the fluid return side to the open channel control valve and the anti-pump control valve. have. In addition, the closing control valve and the open switching control valve are composed of a valve body mechanism and a pilot valve.

Since the conventional fluid pressure drive device of the circuit breaker is an anti-pumping mechanism controlled by an open switching control valve and a closing switching control valve, the anti-pumping mechanism has a complicated configuration, which is large and expensive, and inferior in controllability.

In addition, since the switching control valve for closing and opening switching control valve are composed of a valve body mechanism and a pilot valve, the configuration of the switching control valve is complicated, large, and expensive in this respect as well.

In addition, since the contactor opening and closing piston is disposed at one upper portion, the switching valve is disposed at the lower portion thereof, and the switching control valve is placed at the other side thereof, the overall dimensions are large and particularly large left and right.

In addition, the main valve is installed between the contactor opening and closing piston and the switching valve to achieve high output, and when the fluid supply amount on the fluid supply side is detected to output an abnormal condition when a larger supply amount is detected, the switching valve is fluidized. It was not considered about keeping certain when there is no pressure.

A first object of the present invention is to obtain a fluid pressure drive device of a circuit breaker which can prevent the pumping operation of repeating opening and closing of the contactor, and the anti-pumping mechanism is compact, inexpensive, and excellent in controllability.

A second object of the present invention is to obtain a fluid pressure drive device for a circuit breaker in which the anti-pumping piston can be easily set.

A third object of the present invention is to obtain a fluid pressure drive device of a circuit breaker having a small size and a low cost and high reliability.

A fourth object of the present invention is to obtain a fluid pressure drive device for a circuit breaker having a compact overall size.

A fifth object of the present invention is to obtain a fluid pressure drive device for a circuit breaker that is easy to achieve high output.

A sixth object of the present invention is to obtain a fluid pressure drive device of a circuit breaker which can reliably detect an abnormal state and has high stability.

A seventh object of the present invention is to obtain a fluid pressure drive device for a circuit breaker capable of reliably holding a switching valve even when there is no fluid pressure.

1 is a block diagram showing a closed state of the circuit breaker of the first embodiment of the present invention,

2 is a configuration diagram showing a state during the opening operation of the circuit breaker;

3 is a configuration diagram showing an open state at the end of the opening operation of the circuit breaker;

4 is a configuration diagram showing an initial state during a closing operation of the circuit breaker;

5 is a configuration diagram showing a late state during the closing operation of the circuit breaker;

6 is a configuration diagram showing a state in the course of opening operation in a state where the pilot valve for opening of the circuit breaker is opened;

7 is a configuration diagram showing an open state after the open operation is performed in a state where the open pilot valve for the circuit breaker is opened;

8 is a configuration diagram showing a closed state of the circuit breaker of the second embodiment of the present invention;

9 is a configuration diagram showing a closed state of the circuit breaker of the third embodiment of the present invention;

10 is a configuration diagram showing a state during the opening operation of the circuit breaker;

11 is a configuration diagram showing an open state at the end of the open operation of the circuit breaker;

12 is a configuration diagram showing an initial state during a closing operation of the circuit breaker;

Fig. 13 is a configuration diagram showing a late state during closing operation of the breaker;

14 is a configuration diagram showing a state in the middle of the opening operation in the state in which the pilot valve for opening of the circuit breaker is opened;

Fig. 15 is a configuration diagram showing an open state after the open operation is performed in the open pilot valve for the circuit breaker;

16 is a configuration diagram of an anti-pumping piston mechanism part of the circuit breaker of the fourth embodiment of the present invention.

※ Explanation of symbols for main parts of drawing

11: Open main valve 12: Closed main valve

13: switch valve 17: open main valve pilot chamber

18: low pressure chamber 24: closed main valve pilot chamber

25: through hole 26: auxiliary room

37: pilot valve for closing 39: pilot valve for opening

41: check valve 42: anti-pumping piston

The present invention comprises a contact opening and closing piston for opening and closing the contactor, and a control valve mechanism for operating the contact opening and closing piston to achieve the above object, the control valve mechanism has a switching valve and a switching control valve, the switching A valve is connected to switch the pressure to the cylinder operating chamber of the contactor opening and closing piston, the changeover control valve has a closing control valve and an opening switching control valve, and the closing control valve has a primary side fluid. Connected to a supply side, and a secondary side is connected to a switch valve pilot chamber of the switch valve via a check valve, and the check valve is installed to close the flow from the switch valve pilot chamber to the shutoff control valve. The opening switching control valve has a primary side connected to the switch valve pilot chamber, and a secondary side connected to a fluid return side. In the fluid pressure drive device of a circuit breaker provided with a conduit connecting the fluid return side between the secondary side of the closing control valve and the primary side of the check valve, the anti-pumping piston is configured to close the check valve. The middle of the pipe connecting the fluid return side between the secondary side of the closing switch control valve and the primary side of the check valve is connected to the anti-pumping piston operating room of the anti-pumping piston.

In order to achieve the above object, the present invention provides two throttles in a conduit connected to the fluid return side between the secondary side of the closing switch control valve and the primary side of the check valve. The way is connected to the anti-pumping piston operating room of the anti-pumping piston.

In order to achieve the above object, the present invention uses a ring-shaped gap between the outer diameter of the anti-pumping piston and the inner diameter of the sleeve containing the pipe to connect to the return side from the anti-pumping piston operating chamber. An outer diameter of the anti-pumping piston and a pipe connecting the anti-pumping piston operating chamber between the secondary side of the closing control valve and the primary side of the check valve are included. The annular gap between the casing and the inner diameter of the casing was used to throttle the annular gap.

In another aspect, the present invention is the closed switching control valve is composed of a pilot valve for closing the valve body and the spring in order to achieve the above object, the opening switching control valve is composed of an open pilot valve consisting of the valve body and the spring will be.

In order to achieve the above object, the present invention arranges the contactor opening and closing piston on one side, the changeover control valve on the other side, and the changeover valve on the central portion thereof, so that each of the contactor opening and closing pistons overlaps with the closing control valve for closing. A switching control valve is disposed on the left and right, and the check valve and the anti-pumping piston are disposed between the closing switching control valve and the opening switching control valve.

In order to achieve the above object, the present invention is provided with a main valve interposed between the contact opening and closing piston and the switching valve, and at the same time, the main valve is divided into an opening main valve and a closing main valve.

In order to achieve the above object, the present invention provides an abnormality detecting means for outputting an abnormal state when a large amount of supply is detected by detecting a fluid supply amount on the fluid supply side.

In order to achieve the above object, the switching valve is composed of a two-position three-way valve, and a switching valve pilot chamber is formed at one end side, and the other end side is in communication with the fluid return side and is maintained by the holding mechanism.

Hereinafter, a first embodiment of a fluid pressure drive device of the breaker of the present invention will be described with reference to Figs.

1 is a closed state (state of energization) of the circuit breaker of the first embodiment of the present invention, FIG. 2 is a state during the opening operation of the circuit breaker of the first embodiment, and FIG. 3 is an open state of the circuit breaker of the first embodiment ( 4 shows the initial state during the closing operation of the circuit breaker of the first embodiment, and FIG. 5 shows the late state during the closing operation of the circuit breaker of the first embodiment.

The fluid pressure drive device 3 of the circuit breaker for opening and closing the contact of the contact having the fixed contactor 1 and the movable contactor 2 has a fluid pressure cylinder 4 having a piston 5 for driving the movable contactor 2. Equipped. The hydrophobic pressure area chamber 6 formed on one side of the fluid pressure cylinder 4 is discharged from the fluid pressure source 8 and the supply pressure of the working fluid accumulated in the accumulator 9 is always in operation. The cylinder operation chamber (large pressure area chamber) 7 formed on the other side of the fluid pressure cylinder mechanism 4 is connected to the high pressure supply pressure side or the reservoir 10 by the opening main valve 11 or the closing main valve 12. It is selectively connected to the return side of the low pressure to be connected.

The opening main valve 11 is an anisotropic valve having a mechanism for connecting the cylinder operation chamber 7 to the low pressure return side and opening-operating. The control port 14 of the switching valve 13 is connected to the open main valve pilot chamber 17. The valve body 15 of the open main valve 11 is added in a direction in which the force of the spring 16 is closed. When the open main valve pilot chamber 17 is set to high pressure, the valve seat 19 is closed. When the main valve pilot chamber 17 for opening is low, the valve seat 19 is opened by the pressure of the fluid extruded from the cylinder operation chamber 7. On the back of the valve body 15, a low pressure chamber 18, which is always at a low pressure through the return side, is provided. By providing this low pressure chamber 18, the inner diameter of the opening main valve pilot chamber 17 can be made into the diameter smaller than the valve seat 19. As shown in FIG. However, the valve (by the supply pressure applied to the open main valve pilot chamber 17 rather than the force to open the valve body 15 by the supply pressure acting outward from the valve seat 19 in the closed state of the breaker) 15) The force to close is configured to be larger.

The closing main valve 12 is an anisotropic valve for connecting the cylinder operation chamber 7 to the high pressure supply side to operate the closing operation, and has a valve body 20 and a piston 21. The force of the spring 22 is applied to the valve body 20 in the direction which closes the valve seat 27. The force of the spring 23 is applied to the piston 21 in the direction in which the valve body 20 is opened from the valve seat 27. The spring 22 on the valve body 20 side generates a larger force than the spring 23 on the piston 21 side. The control port 14 of the switching valve 13 is connected to the closing main valve pilot chamber 24 formed on the spring 23 side of the piston 21 like the opening main valve pilot chamber 17. An auxiliary chamber 26 is provided on the rear surface of the valve body 20. This auxiliary chamber 26 is connected to the valve chamber which communicates with the cylinder operation chamber 7 via the through-hole 25 which penetrates the valve body 20. As shown in FIG. The diameter of the valve seat 27 of the main valve 12 for closing is smaller than the inner diameter of the main valve pilot chamber 24 for closing, that is, the outer diameter of the piston 21, and larger than the inner diameter of the auxiliary chamber 26. As a result, when the main valve pilot chamber 24 for closing is set at a low pressure, the valve body 20 has a difference in the diameter difference between the force of the spring 22 and the spring 23 and the diameter of the valve seat 27 and the auxiliary chamber 26. It is closed by the force by the supply pressure acting on the part and the force by the pressure acting on the auxiliary chamber 26. When the main valve pilot chamber 24 for closing is set to high pressure, the valve body 20 is opened by the force generated here.

The switching valve 13 is comprised with a 2-position three-way valve. The switching valve pilot chamber 28 of the switching valve 13 is selectively switched to high or low pressure via an open pilot valve 37 or a closed pilot valve 39. By this switching, the control port 14 through the open main valve pilot chamber 17 and the closed main valve pilot chamber 24 is connected to the supply side valve chamber 29 connected to the high pressure supply side or the return side connected to the low pressure return side. It is selectively connected to any one of the valve chambers 30. The cylindrical portion 32 of the valve body 31 of the selector valve 13 is configured to have a diameter smaller than that of the supply valve seat 33 so as to open the rear surface of the cylindrical portion 32 to the return side. The pressure receiving area of the switching valve pilot chamber 28 is configured to be larger than the pressure receiving area of the diameter difference portion between the return valve seat 34 and the cylindrical part 32. The switching valve pilot chamber 28 is connected to a valve chamber having a control port 14 via a throttle 35.

Moreover, the holding mechanism 36 is provided in the back surface of the cylindrical part 32 of the valve body 31 of the selector valve 13. This holding mechanism 36 is for mechanically holding the valve body 31 when there is no fluid pressure, and has a holding force that does not affect the normal operation by the fluid pressure.

The open pilot valve 37 and the closed pilot valve 39 are both anisotropic valves that are opened when the open solenoid 38 or the closed solenoid 40 is excited, and closed by spring force when the open solenoid 38 is closed. . Both of them are connected in series between the high pressure supply side of the switching valve 13 and the low pressure return side of the reservoir 10 with the check valve 41 interposed therebetween. The primary side of the closed pilot valve 39 is connected to the supply side of high pressure. The secondary side of the closing pilot valve 39 is connected to the primary side of the open pilot valve 37 and the switching valve pilot chamber 28 via the check valve 41. The secondary side of the open pilot valve 37 is connected to the low pressure return side.

In addition, an anti-pumping piston 42 and a spring 43 are provided on the back of the check valve 41. The spring 43 is always provided in a room that communicates with the low pressure return side. On the secondary side of the closed pilot valve 39, a conduit extending from the throttle 45 and the throttle 46 to the return side is provided. An anti-pumping piston operating chamber 44 is connected between the throttle 45 and the throttle 46 of the pipeline. Accordingly, the anti-pumping piston 42 closes the check valve 41 when the pressure acting on the operating chamber 44 is high, and when the anti pumping piston 42 is low, the check valve 41 is opened by the force of the spring 43.

Next, the operation of the first embodiment described above will be described.

In the closed state in Fig. 1, the supply valve seat 33 of the switching valve 13 is open, and the cylinder operation chamber 7, the main valve pilot chamber 17 for opening, the main valve pilot chamber 24 for closing, and the switching The valve pilot chamber 28, the primary side of the open pilot valve 37, the primary side of the closed pilot valve 39, and the secondary side of the check valve 41 are all high pressure, except for the supply side valve seat 33. All valves are closed.

When the open command occurs in this state, as shown by the arrow in Fig. 2, the open solenoid 38 is excited, and the open pilot valve 37 is pushed open to open the switching valve pilot chamber 28 at the low pressure return side. Since the switching valve 13 is connected to the valve chamber, the switching valve 13 is switched to the open operation state as shown by the arrow in FIG. 2 by the high pressure acting on the valve chamber having the supply-side valve chamber 29 and the control port 14. That is, the supply valve seat 33 is closed and the return valve seat 34 is switched to the open state. As a result, the control port 14 and the open main valve pilot chamber 17 connected thereto are connected to the return side via the throttle 35 and the open pilot valve 37 to form a low pressure, so the open main valve 11 Is opened as shown by the arrow of FIG. 2 by the high pressure which acts on the cylinder operation chamber 7 of the fluid pressure cylinder 4, and connects the cylinder operation chamber 7 to a return side. As a result, the piston 5 operates toward the cylinder operation chamber 7 to start the opening operation of the movable contactor 2. Thereafter, when the fluid of the cylinder operation chamber 7 is extruded by the high pressure applied to the hydrophobic pressure area chamber 6 of the cylinder mechanism 4, it is generated before and after the valve seat 19 of the main valve 11 for opening. Due to the pressure difference, the open main valve 11 is kept open and the contacts 1 and 2 shown in FIG. 3 reach the full open state. When the opening operation is completed, the flow from the cylinder operation chamber 7 to the return side of the opening main valve 1 through the valve seat 19 stops, so that before and after the valve seat 19 of the opening main valve 11 is stopped. Since the pressure difference is eliminated, the main valve 11 for opening is closed by the force of the spring 16, the valve seat 19 is closed. On the other hand, since the excitation of the opening solenoid 38 is released, the opening pilot valve 37 is also closed by the spring force, and all valves other than the return side valve seat 34 are closed. At this time, since the switching valve pilot chamber 28 is connected to the control port 14 which has already become low pressure via the throttle 35, even if the open pilot valve 37 is closed, it will be maintained at low pressure, and the switching valve 13 Keep) open.

In addition, since the closing main valve pilot chamber 24 is already at a low pressure together with the opening main valve pilot chamber 17, once the piston 21 of the closing main valve 12 moves upward and the opening operation is completed, Although the main valve 12 for closing is closed from the beginning by the spring 23, even if only the piston 21 moves, it will remain closed, and it does not affect the said opening operation.

Next, in the open state of Fig. 3, when the closing instruction occurs, the closing solenoid 40 is excited as indicated by the arrow in Fig. 4, and the closing pilot valve 39 is pushed open. As a result, fluid flows from the primary side to the secondary side of the closed pilot valve 39 connected to the high pressure supply side, and pushes the check valve 41 to open the switching valve pilot chamber 28 to a high pressure switching valve. Switch (13) to closed operation. That is, the switching valve 13 closes the return valve seat 34 and switches the supply valve seat 33 to the open state. As a result, the control port 14 and the closing main valve pilot chamber 24 connected thereto become high pressure, so that the piston 21 and the valve body 20 of the closing main valve 12 move downward to move the valve body 20. Is opened from the valve seat 27, the cylinder operation chamber 7 is connected to the high pressure side via the valve seat 27 part, and the piston 5 and the movable contactor 2 start closing operation. At the same time as the pressure in the cylinder operating chamber 7 rises, the pressure in the auxiliary chamber 26 increases through the through hole 25, but does not rise to the supply pressure while the piston 5 is moving. That is, the pressure enough to drive the piston 5 to overcome the load such as the supply pressure acting on the hydrophobic pressure area chamber 6, the mass of the movable contactor, the frictional force of the packing around the piston 5, and the like is sufficient to drive the cylinder operation chamber. This pressure is generated in (7), and this pressure is determined by the ratio of the hydraulic pressure area between the rough hydrostatic pressure area chamber 6 and the cylinder operation chamber 7, but since the hydraulic pressure area is larger in the cylinder operation chamber 7, this pressure is the supply pressure. It is lower than. Accordingly, at this pressure, the piston 21 is pushed downward by the supply pressure acting on the main valve pilot chamber 24 for closing and the force of the spring 23, and this force is applied to the auxiliary chamber 26 or the spring 22. Is larger than the force acting upward from As a result, during the closing operation of the piston 5, the closing main valve 12 is kept open and continues the closing operation.

At this time, when the switching valve 13 is switched to the closed operation state, the open main valve pilot chamber 17 also becomes high pressure, but the open main valve 11 is closed from the start of operation, and only the force for closing the valve increases. .

On the other hand, when the pilot valve 39 for closing is opened and the secondary side becomes a high pressure, the pressure of the anti-pumping piston operating chamber 44 is raised to the pressure determined by the throttles 45 and 46, as shown in FIG. By this pressure, the anti-pumping piston 42 overcomes the force due to the high pressure of the secondary side of the check valve 41 and moves to the left to push the check valve 41 to close. However, since the switching valve 13 has already been switched to the closed operation state and the valve chamber having the control port 14 is at high pressure, the switching valve pilot chamber 28 connected thereto via the throttle 35 is a check valve 41. Even if the door is closed, it is maintained at high pressure and maintains the closed operation. Similarly, even if the excitation of the closing solenoid 40 is released and the closing pilot valve 39 is closed, the switching valve 13 maintains the closing operation state.

When the closing operation is completed and the piston 5 stops and the flow stops, the cylinder operating chamber 7, the through hole 25, and the auxiliary chamber 26 are increased to the supply pressure, and thus the force of the spring 22 is increased. The valve body 20 and the piston 21 are pushed up to close the main valve 12 for closing. In addition, when the pilot valve 39 and the check valve 41 for closing are closed, the pressure between them passes through the throttles 45 and 46 to the return side and gradually becomes a low pressure. The anti-pumping piston 42 is returned to the right side by the spring 43. As a result of these series of operations, the closing state shown in Fig. 1 is reached.

According to this first embodiment, the following effects are obtained.

First, since the high speed opening operation is required in the circuit breaker, the main valve 11 for opening needs to flow a very large flow rate so that the fluid in the cylinder operating chamber 7 can be discharged quickly, and the diameter of the valve seat 19 or the valve body Since the opening amount of (15) becomes large, the pilot flow rate for operating this must also be large. However, according to the first embodiment, since the low pressure chamber 18 is provided on the back of the valve body 15 of the open main valve 11, the inner diameter of the open main valve pilot chamber 17 is smaller than that of the valve seat 19. The force to close the valve due to the supply pressure applied to the main valve pilot chamber 17 for the open main valve pilot chamber 17 to overcome the force to open the valve due to the supply pressure acting outward from the valve seat 19 even in a small diameter. This can prevent leakage from the valve seat 19. Therefore, the pilot flow rate supplied to and discharged from the open main valve pilot chamber 17 can be reduced, so that the switching valve 13 is a small valve. Moreover, since the switching valve 13 also has the structure which opened the back surface of the cylindrical part 32 of the valve body 31 to the return side, the switching valve pilot chamber 28 is the return side valve seat 34 and the cylindrical part 32. As shown in FIG. Since the hydraulic pressure area may be larger than the area of the diameter difference portion, the pilot flow rate for operating the switching valve 13 may also be small, and the open pilot valve 37 and the closed pilot valve 39 may be downsized. . As a result, the entire fluid pressure drive device can be miniaturized.

In addition, since the low pressure chamber 18 of the open main valve 11 is connected to the return side at a place where it is hard to be affected by the flow of the large flow rate flowing out from the open main valve 11 at the time of open, the influence of pressure fluctuations, etc. In response, the opening amount of the valve body 15 fluctuates and there is no inconsistency in characteristics.

Moreover, since the back surface of the cylindrical part 32 of the selector valve 13 is opened to the return side, and the holding mechanism 36 is provided in this part, the fluid pressure source 8 stops and it accumulates in the accumulator 9, too. Even if it is not, the position of the valve body 31 is mechanically maintained, and thus the safety of the operation is increased because the breaker is maintained in the same state as before the operation even when the operation is resumed after carrying out operations such as transportation, installation and inspection.

In general, the two-position three-way valve is simple in configuration, but the coaxiality of the opening and closing valves needs to be managed. Therefore, if the main valve that flows a large flow rate is made large, it is difficult to obtain high precision because it is large. do. On the other hand, in the first embodiment, the small switching valve 13 is configured by dividing the large opening main valve 11 and the closing main valve 12 by using a two-position three-way valve. In the first embodiment, since the main valve 12 for closing is also configured by dividing the valve body 20 and the piston 21, precision control such as coaxiality at the time of machining of parts is facilitated, making production easier.

Next, when the opening main valve 11 is closed after the opening operation, all the surroundings become low pressure, and the valve body 15 adheres to the valve seat 19 by the force of the spring 16. When the closing main valve 12 is also closed after the closing operation, all of the surroundings become supply pressure, and the valve body 20 adheres to the valve seat 27 by the force of the spring 22. Therefore, since the force at the time of attachment is small compared with the structure closed by fluid pressure, damage to a valve seat can be prevented, long life can be obtained, and high reliability is maintained for a long time. In addition, these valves have a force opposite to the function that the valve is intended for, that is, when the main valve 11 for opening is closed, and the main valve 12 for closing is open, Since it acts in the direction of closing each valve, the valve which is already closed by the spring force is kept tightly closed, for example, it is surely closed by the fluid pressure even if it is not completely closed by the spring force alone. Leakage from the valve seat portion can be prevented more reliably. On the other hand, the open pilot valve 37, the closed pilot valve 39, and the check valve 41 are also opened, and after a predetermined operation, the surroundings become the same pressure and are closed by spring force. When 37 is the closing operation, the closing pilot valve 39 and the check valve 41 are kept tightly closed by the fluid pressure after the closing operation, respectively, so that the opening main valve 11 and the closing main valve ( As shown in 12), damage to the valve seat can be prevented, and leakage is difficult and high reliability can be obtained.

The low pressure chamber 18 of the open main valve 11 and the auxiliary chamber 26 of the closed main valve 12 also have the following effects. That is, in the open main valve 11, the low pressure chamber 18 is provided so that the open main valve pilot chamber 17 is made smaller in diameter so that the force for closing the valve in closing operation is minimized. 19) Excessive stress does not act, thus preventing damage to the valve seat. On the other hand, in the closing main valve 12, the pressure of the auxiliary chamber 26 connected to the cylinder operating chamber 7 through the through-hole 25 during the opening state during the opening operation is required to close the valve. Since there is no excessive stress on the valve seat 27, damage to the valve seat can be prevented.

In addition, if any abnormality occurs and the pilot valve 39 for closing is left open even after the closing operation, the secondary side is kept at high pressure, and thus leaks continuously to the low pressure side through the throttles 45 and 46, and anti-pumping. The piston operating chamber 44 is raised to the pressure determined by these throttles 44 and 46, and the check valve 41 is moved with the anti-pumping piston 42 moving to the left as in the closing operation shown in FIG. Keep closed). When the open command occurs in this state, as shown in Fig. 6, the open solenoid 38 is excited, the open pilot valve 37 is opened, and the primary side of the check valve 41 is high pressure, and the secondary side is In the low pressure state, the anti-pumping piston 42 is configured such that the force acting on the anti-pumping piston operating chamber 44 side is larger than the force acting on the primary side of the check valve 41 even in this state. The closed state of the check valve 41 is continuously maintained. Therefore, the opening operation is performed to reach the open state shown in Fig. 7, but the check valve 41 remains closed even in this state. Therefore, even when the closing instruction occurs in this state, the closing pilot valve 39 is in an open state, so the pressure of each part does not change at all and the check valve 41 remains closed. Therefore, the selector valve 13 is not switched to the closing operation state and no closing operation is performed. That is, when an abnormality occurs in the pilot valve 39 for closing, the closing state of the switching valve 13 is maintained by the anti-pumping piston 42, and when the opening command is generated, the opening operation is performed. Afterwards, it cannot be closed. Therefore, it functions as an anti-pumping mechanism that prevents malfunctions that are closed after the opening operation.

In addition, when the pilot valve 39 for closing is left open, the leak continues to the low pressure side through the throttles 45 and 46, so that the flow rate of the high-pressure working fluid accumulated in the accumulator 9 increases and the fluid pressure source 8 Since the number of times of operation increases, safety can be improved by providing an abnormality detecting means for detecting this and outputting an abnormal state.

Further, in the closed state, the pressure in the cylinder operating chamber 7 drops and the piston 21 of the main closing valve 12 moves downward at a pressure higher than the pressure when the piston 5 starts to open. Since the main valve 12 is set to push to open, the high pressure is supplied from the closing main valve 12 before the piston 5 starts to open, so that the leakage occurs from the opening main valve 11, for example. It is also possible to prevent the malfunction of the opening operation at will.

In addition, the piston 5 is set so that the opening main valve 11 is opened at a pressure lower than the pressure when the cylinder operating chamber 7 rises in the open state and the piston 5 starts to operate closed. Since the main valve 11 for opening is opened and the pressure rises before the () starts closing operation, even if the leak occurs from the main valve 12 for closing, the malfunction which operates with closing can be prevented arbitrarily.

In addition, since the switching valve pilot chamber 28 is connected to the control port 14 via the throttle 35, the switching valve 13 is an open pilot valve 37, a closed pilot valve 39, a check valve ( Even if there is a slight leakage from 41) or the like, since the pressure is maintained at the same pressure as the control port 14 which has already been switched, there is no malfunction that is arbitrarily switched.

As described above, according to the first embodiment, the fluid pressure drive device can be downsized, which makes production easier, and also prevents malfunctions, thereby ensuring high reliability for a long time, thereby improving the reliability of the circuit breaker.

Next, a second embodiment of the fluid pressure drive device of the circuit breaker of the present invention will be described with reference to FIG.

8 is a configuration diagram showing a state during the opening operation of the drive device. The main valve 12 for closing | closing is set as the valve body 20a which integrated the valve body 20 and the piston 21, and removes the spring 23. As shown in FIG. Even if it is comprised in this way, the operation | movement which the piston 21 falls from the valve body 20 during the opening operation shown in FIG. 2 of the above-mentioned 1st embodiment will be lost, and it will only be as shown in FIG. 8, and a valve is similarly closed, The progress of the opening operation does not change.

Next, a third embodiment of the fluid pressure drive device of the breaker of the present invention will be described with reference to Figs.

This third embodiment removes the opening main valve 11 and the closing main valve 12 of the first embodiment, and controls the control port 14 of the switching valve 13 to the cylinder operating chamber 7 of the fluid pressure cylinder 4. ), And the fluid pressure cylinder 4 is directly driven by the selector valve 13. 9 is a closed state (state of energization), FIG. 10 is a state of open operation, FIG. 11 is an open state (blocked state), FIG. 12 is an initial state during closing operation, and FIG. 13 is a closing state Represents a late state during operation. 14 and 15 show an operation when the opening operation is performed with the closing pilot valve 39 open. Except that there is no opening main valve 11 and the closing main valve 12, the same configuration as in the embodiment shown in Figs. 1 to 7 has the same configuration, and the opening and closing operation and closing pilot valve 39 in the normal state 39 The opening operation in the case where an abnormality is generated and remains open is the same as in the above-described embodiment.

This third embodiment is suitable for a fluid pressure drive device for driving a medium to high capacity breaker. In this type of circuit breaker, since the load at the time of the opening operation is relatively small, the fluid pressure cylinder 4 is made small, so that the valve for driving it also has a small flow rate. For this reason, the structure which drives a fluid pressure cylinder directly with the switching valve 13 without using a main valve is possible. According to the third embodiment, the same effects as those of the first embodiment can be obtained, and high reliability can be realized for a long time, and since the main valve is unnecessary, further miniaturization can be achieved, and manufacturing is easy.

Next, a fourth embodiment of the fluid pressure drive device of the circuit breaker of the present invention will be described with reference to FIG.

It is a block diagram of the anti-pumping piston mechanism part of the same circuit breaker. In this fourth embodiment, the sleeve 47 for accommodating the check valve 41 and the anti-pumping piston 42 is provided separately. And the throttle mechanism is made into the annular clearance 46 prescribed | regulated by the diameter difference of the outer diameter of the anti-pumping piston 42 and the inner diameter of the sleeve 47 which slidably encloses this piston 42. That is, the throttle mechanism of the conduit connected from the anti-pumping piston operating chamber 44 to the fluid return side is formed using this annular gap 46. This eliminates the need for installing a separate throttle mechanism in the pipeline, resulting in a simple configuration and at the same time miniaturizing the device. Moreover, the throttle mechanism is made into the annular clearance 45 prescribed | regulated by the diameter difference of the outer diameter of the sleeve 47 and the inner diameter of the casing which contains this sleeve 47. In other words, the annular gap 45 is used for the throttle mechanism of the conduit connected to the anti-pumping piston operating chamber 44 between the secondary side of the closing control valve 39 and the primary side of the check valve 41. It is configured by. This eliminates the need to install a separate throttle mechanism in the pipeline, resulting in a simple configuration and miniaturization of the device.

As described above, according to the embodiment of the present invention, by installing the anti-pumping piston 42 to close the check valve 41, the secondary side of the closing control valve 39 and the check valve 41 Since the middle of the pipeline connected to the fluid return side between the primary side was connected to the anti-pumping piston operation chamber 44 of the anti-pumping piston 42, an abnormality occurred in the closing control valve 39 and the closing operation was terminated. The anti-pumping piston operating chamber 44 remains connected to the high pressure on the secondary side of the closing switch control valve 39 even if the valve is left open even after the opening. The decommissioning state is maintained. Then, when the open command occurs, the open operation of the switching valve 13 is performed, but after the open operation, the open control switch 39 is already open even if the open command occurs. The closing operation of 13) is not performed. Therefore, the pumping operation which repeats opening and closing of the contacts 1 and 2 can be prevented. In addition, an anti-pumping piston 42 which performs the operation of closing the check valve 41 is provided to prevent the anti-pumping piston 42 from running in the middle of the pipeline connected from the secondary side of the closing control valve 39 to the fluid returning side. Since the pumping operation can be prevented by the configuration connected to the pumping piston operating chamber 44, the configuration of the anti-pumping mechanism can be simplified, making it compact and inexpensive, and at the same time, only the secondary side of the closing control valve 39 is used. The pumping mechanism can be operated and excellent controllability can be obtained.

In addition, the anti-pumping piston operation room is provided with the middle of two throttles 45 and 46 provided in a conduit connected to the fluid return side between the secondary side of the closing control valve 39 and the primary side of the check valve 41. Since it is connected to (44), by adjusting these two throttles 45 and 46, the pressure of the anti-pumping piston operation chamber 44 can be set easily, and setting of the anti-pumping piston 42 is easy.

In addition, since the closing control valve 39 and the open switching control valve 37 are constituted by a pilot valve composed of a valve body and a spring, the switching control valves 37 and 39 are simplified in this respect, so that the small size and low reliability It can be done.

In addition, the switching control valves 37 and 39 are arranged on the other side of the contact opening and closing piston 51, and the switching valve 13 is disposed at the center thereof so that the switching control valves 39 and the closing control valve 39 are opened. Since the switching control valve 37 is disposed on the left and right, and the check valve 41 and the anti-pumping piston 42 are disposed between the closing switching control valve 39 and the opening switching control valve 37, the overall dimensions It can be arranged compactly so that the driving device can be arranged in a narrow place.

Also, since the main valve is installed between the contactor opening and closing piston and the switching valve, the contactor opening and closing piston can be operated by amplifying the actuation force of the switching valve to the main valve, thereby achieving high output of the circuit breaker. Since the main valve for opening and the main valve for closing are arranged side by side between the piston and the switching valve, the overall configuration is compact and the output of the circuit breaker can be increased.

In addition, safety can be improved because an abnormality detecting means for outputting an abnormal state is provided when the fluid supply amount on the fluid supply side is detected and a larger supply amount is detected.

In addition, since the switching valve 13 is composed of a two-position three-way valve, it is inexpensive with a simple configuration, and a switching valve pilot chamber 28 is formed at one end of the switching valve, and the other end is in communication with the fluid returning side. Since it is held by the holding mechanism 36, it can reliably hold | maintain even when there is no fluid pressure.

According to the present invention, the anti-pumping piston is provided with an anti-pumping piston for closing the check valve, and the anti-pumping piston is connected to the fluid return side between the secondary side of the closing control valve and the primary side of the check valve. Since it is connected to the anti-pumping piston operating room of the pump, the pumping operation which repeats opening and closing of a contactor can be prevented, and also the fluid pressure drive device of the circuit breaker of a breaker with a compact, inexpensive, and excellent controllability can be obtained.

According to the present invention, two throttles are provided in a conduit connected to the fluid return side between the secondary side of the closing control valve and the primary side of the check valve, and the middle of the two throttles is Since it is connected to the anti-pumping piston operating room, it is possible to obtain a fluid pressure drive device of a circuit breaker in which the anti-pumping piston can be easily set.

In addition, according to the present invention, the switching control valve for closing is composed of a closing pilot valve composed of a valve body and a spring, and the opening switching control valve is composed of an opening pilot valve consisting of a valve body and a spring. It is possible to obtain a fluid pressure drive device of a circuit breaker, which is inexpensive and reliable.

According to the present invention, the contact opening and closing piston is arranged on one side, the switching control valve on the other side, and the switching valve is arranged so as to overlap each other at the center thereof, and the closing switching control valve and the opening switching control valve are disposed on the left and right sides. Since the check valve and the anti-pumping piston are arranged between the closing switch control valve and the opening switch control valve, the fluid pressure driving device of the circuit breaker having a compact dimension can be obtained.

According to the present invention, since the main valve is interposed between the contactor opening and closing piston and the switching valve, the main valve is divided into an open main valve and a closed main valve to be installed side by side to obtain a fluid pressure drive device of a circuit breaker that is easy to achieve high output. Can be.

According to the present invention, when the fluid supply amount on the fluid supply side is detected and a larger supply amount is detected, an abnormality detection means for outputting an abnormal state is provided, so that the abnormal state can be reliably detected and the fluid of the circuit breaker having high stability. A pressure driving device can be obtained.

According to the present invention, the switching valve is composed of a two-position three-way valve, and a switching valve pilot chamber is formed at one end side, and the other end communicates with the fluid return side, and is maintained by the holding mechanism, so that there is no fluid pressure. It is possible to obtain a fluid pressure drive device of a circuit breaker in which a switching valve is reliably maintained.

Claims (10)

And a control valve mechanism for operating the contactor opening and closing piston for opening and closing the contactor, and the contactor opening and closing piston, The control valve mechanism has a switching valve and a switching control valve, and the switching valve is connected to switch the pressure on the cylinder operating chamber of the contactor opening and closing piston, The switching control valve has a closing switching control valve and an opening switching control valve, and the closing switching control valve has a primary valve connected to a fluid supply side, and a secondary valve connecting a check valve to a switching valve pilot chamber of the switching valve. Is connected via, the check valve is installed to close the flow to the switch control valve for closing in the switch valve pilot room, The open switching control valve has a primary side connected to the switch valve pilot chamber, a secondary side connected to a fluid return side, and a fluid between the secondary side of the closing switch control valve and the primary side of the check valve. In the fluid pressure drive device of a circuit breaker provided with a conduit connected to the return side, The anti-pumping piston is provided with an anti-pumping piston for closing the check valve, and is connected to a fluid return side between the secondary side of the closing control valve and the primary side of the check valve. A fluid pressure drive device for a circuit breaker, connected to an anti-pumping piston operating room. The method of claim 1, Two throttles are provided in a conduit connected to the fluid return side between the secondary side of the closing control valve and the primary side of the check valve, and the middle of the two throttles is the anti-pumping piston of the anti-pumping piston. A fluid pressure drive device for a circuit breaker, connected to an operation room. The method of claim 2, The annular gap is set as a throttle by using the annular gap between the outer diameter of the anti-pumping piston and the inner diameter of the sleeve that contains the pipe connecting to the return side from the anti-pumping piston operating chamber. Fluid pressure drive device of circuit breaker. The method of claim 3, wherein An annular shape between the outer diameter of the anti-pumping piston and the inner diameter of the casing that contains the conduit connecting the anti-pumping piston operating chamber between the secondary side of the closing control valve and the primary side of the check valve. A fluid pressure drive device for a circuit breaker, wherein the annular gap is used as a throttle by using a gap. The method according to any one of claims 1 to 4, The closing switch control valve is composed of a closed pilot valve consisting of a valve body and a spring, the open switch control valve is a fluid pressure drive device of the circuit breaker, characterized in that composed of an open pilot valve consisting of a valve body and a spring . The method according to any one of claims 1 to 4, The contactor opening and closing piston is arranged on one side, the switching control valve on the other side, and the switching valve is arranged on the center portion thereof, respectively, and the closing switching control valve and the opening and closing switching control valve are disposed on the left and right sides. And said check valve and anti-pumping piston are arranged between said closing control valve and said opening switching control valve. The method of claim 6, And a main valve interposed between the contactor opening and closing piston and the switching valve, and at the same time, the main valve is divided into an opening main valve and a closing main valve and installed side by side. The method according to any one of claims 1 to 4, A fluid pressure drive device for a circuit breaker, characterized in that an abnormality detecting means is provided for detecting a fluid supply amount on the fluid supply side and outputting an abnormal state when a larger supply amount is detected than usual. The method according to any one of claims 1 to 4, The switching valve is composed of a two-position three-way valve is formed with a switching valve pilot seal on one side, the other side is in communication with the fluid return side, the fluid pressure drive device of the circuit breaker, characterized in that the holding mechanism. A contactor opening and closing piston for opening and closing a contactor comprising a fixed contactor and a movable contactor, a control valve mechanism for operating the contactor opening and closing piston, a fluid pressure source and an accumulator for supplying fluid to the contactor opening and closing piston and the control valve mechanism. Equipped, The control valve mechanism has a switching valve and a switching control valve, the switching valve is composed of a two-position three-way valve, the center of which is connected to the control port, both sides are connected to the fluid supply source and the fluid return side, It is installed to switch the pressure to the cylinder operation chamber of the piston, the switching control valve is composed of a pilot valve for closing and the open pilot valve consisting of a valve body and a spring, the pilot valve for the closing is the primary side to the fluid supply side And a secondary side is connected to a switch valve pilot chamber of the switching valve via a check valve, and the check valve is installed to close the flow from the switch valve pilot chamber to the closed pilot valve, and the open pilot The primary side of the valve is connected to the switching valve pilot chamber, the secondary side of the valve is connected to the fluid return side. Side and according to the check the hydraulic drive device for a circuit breaker is installed a conduit connected to the fluid return side between itself and the primary side of the valve, The contactor opening and closing piston is arranged on one side, the changeover control valve on the other side, and the changeover valve is disposed on the center portion thereof, and the closing switch control valve and the open switching control valve are disposed on the left and right, The check valve and the anti-pumping piston are disposed between the closing switch control valve and the opening switching control valve, and the closing switching control valve is composed of a closing pilot valve composed of a valve body and a spring. The switching valve for the valve is provided with an anti-pumping piston for closing the check valve composed of an opening pilot valve formed of a valve body and a spring, and includes a secondary side of the closing control valve and a primary side of the check valve. Two throttles are installed in the middle of the pipeline connecting to the fluid returning side, and the middle of the throttle The hydraulic drive device for a circuit breaker, characterized in that the pumping piston connected to the tee operating room.