KR100336828B1 - Liquid-pressurized actuating device - Google Patents

Abstract

By providing compact integration, it provides a high-pressure hydraulic operation device with high reliability that enables stable operation with a simple structure.

The drive section 20 is provided with a conduit 21c for supplying a high pressure liquid from the accumulator 40 to the first liquid chamber 24. The pipeline 21c is comprised so that it may become a double cylinder on coaxial so that the outer side of the drive cylinder 21 may be covered. In addition, the hydraulic control part 30, the accumulator 40, the pump 50, the hydraulic pressure monitor 60, and the low pressure tank 70 are detachably attached to the cylinder end e nd 21a, respectively.

Description

Hydraulic Manipulation Device {LIQUID-PRESSURIZED ACTUATING DEVICE}

The present invention relates to a hydraulic operation device for performing the opening and closing operation of the circuit breaker.

In recent years, when power demand tends to increase, large-capacity and ultra-high pressure transmission systems are increasingly being installed. With this, gas circuits by SF6 gas insulation have become mainstream as circuit breakers employed in power transmission systems. By the way, when performing the opening-closing operation of a circuit breaker, the operation apparatus using a fluid as a drive source is known widely. In the operation apparatus using the double gas (compressed air) as a driving source, the driving force is remarkably increased with the increase of the capacity of the power transmission system or the ultra high pressure, and thus the facilities such as the pneumatic cylinder and the air tank are enlarged. In addition, since the air supply / exhaust sound at the time of operation becomes large, a silencer is necessary and equipment is easy to complicate.

On the other hand, an operating device using a liquid other than a gas as a driving source, a so-called hydraulic operation device, has the following advantages. First, since liquids are easier to be used at higher pressure and larger output than gas, it is easy to miniaturize the device. Moreover, since there is no supply / exhaust sound at the time of operation, the noise at the time of operation can be remarkably reduced. In addition, the response is excellent due to the incompressibility of the liquid. As described above, the hydraulic operation device is promising as a driving source in response to a large capacity and ultra high pressure circuit breaker, and further improvement in performance is required.

Here, with reference to FIG. 9 and FIG. 10, the prior art example of a hydraulic operation apparatus is demonstrated concretely. Fig. 9 shows a configuration example of a conventional hydraulic operation device, and Fig. 10 shows an arrangement example of the hydraulic operation device. As shown in FIG. 9, the opening-closing part 1 of the circuit breaker is comprised from the fixed electrode 2 and the movable electrode 3, and the movable electrode 3 is connected to the drive part 20 of the hydraulic pressure control apparatus 10. As shown in FIG. The drive unit 20 of the hydraulic control device 10 connects the drive cylinder 21 and the drive piston 22 slidably inserted therein, and the drive piston 22 and the movable electrode 3 on the breaker side. The drive rod 23 is comprised.

In the space in the drive cylinder 21, the first liquid chamber 24 and the second liquid chamber 25 are formed on the driving rod 23 side (moving electrode 3 side) and the opposite side as partition walls for driving the driving piston 22. Each is formed. The hydraulic control part 30 is connected to the 2nd liquid chamber 25. The hydraulic pressure control unit 30 is means for selectively supplying and discharging the working liquid (pressure fluid) in the second liquid chamber 25 to control the hydraulic pressure in the liquid chamber 25. The hydraulic control unit 30 is provided with a switching valve 301 for controlling the supply and discharge of the working liquid and an electromagnetic valve 302 for driving the switching valve 301. However, the solenoid valve 302 is not provided when the switching valve 301 can be driven directly by a solenoid or the like. Moreover, between this hydraulic control part 30 and the 1st liquid chamber 24 is connected by the pipeline 303. As shown in FIG.

The accumulator (accumulation device) 400 which always operates high pressure liquid with respect to the 1st liquid chamber 24 is connected to the 1st liquid chamber 24 via the piping 401 which is a high pressure piping. As the accumulator 400, one of the vessels separated from the movable partition wall is a nitrogen gas chamber 400a, a high pressure nitrogen gas is filled therein, and the operating liquid is maintained at a high pressure using the compressed energy of the nitrogen gas. It is generally used.

A pump unit 500 is provided between the hydraulic control unit 30 and the accumulator 400 to generate a high pressure working liquid by the liquid discharged from the hydraulic control unit 30 and to supply the accumulator 400. In the pump unit 500, an electric motor, a pump, and the like are integrally housed in the low pressure tank 501. The hydraulic pressure control unit 30 is connected to the low pressure tank 501 via a pipe line 304, which is a low pressure pipe, to collect the drainage liquid from the second liquid chamber 25 and to accumulate a low pressure working liquid. The pump unit 500 and the accumulator 400 are connected via a conduit 502 which is a high pressure pipe.

As described above, the hydraulic operation apparatus 10 is usually housed in the mechanism box 100 shown in FIG. 10. The instrument box 100 is fixed to one end of a gas tank (not shown) in which the opening / closing part 1 of the breaker is accommodated via a flange 101. The container 102 is provided in the flange 101, and the frame 103 is connected to this container 102. As shown in FIG. Thus, the frame 103 is provided with an auxiliary opening / closing contact 104 that cooperates with the driving rod 23 to detect the opening / closing state of the opening / closing part 1 as an electric signal. A base 105 is provided at the bottom of the instrument box 100, and the accumulator 400 and the pump unit 500 are fixed on the base 105.

However, as mentioned above, the conventional hydraulic operation apparatus had the following problems. That is, the drive unit 20 of the hydraulic pressure control device 10 is integrally configured with the hydraulic pressure control unit 30, whereas the accumulator 400 and the pump unit 500 are disposed separately. Therefore, pipelines 304, 401, 502 were arranged to connect them. In the case of the use of these connection lines, the liquid tightness against external leakage of the working fluid or the pipe strength against the vibrations of the breaker should be taken into account. In particular, since the accumulator 400 is formed of a cylindrical container having a diameter and a long length thinner from the constraint as a pressure vessel (see FIG. 10), the accumulator 400 delivers a high-pressure working liquid from the accumulator 400 into the driving cylinder 21 on the driving unit 20 side. In order to do so, a long pipeline 401 was indispensable. Moreover, this pipeline 401 needed to be aligned with good accuracy so as to be parallel to the axial direction of the drive cylinder 21. In the prior art, which requires more accurate positioning with such a plurality of pipes, a problem arises in that the manufacturing cost and the assembly cost increase. In addition, if the pipeline, which is a hydraulic transmission path, is long and large, the response is reduced.

Therefore, in order to omit the high-pressure pipe 401, a configuration in which the accumulator 400 is directly connected to the drive cylinder 21 of the drive unit 20 is also considered. However, in the case where the drive cylinder 21 and the accumulator 400 are directly connected by the layout as it is, the shaft length of the accumulator 400 is generally longer than that of the drive unit 20, so that the mechanism for storing the same increases. It was difficult to reduce the size of the device due to poor design of space efficiency.

On the other hand, the accumulator 400 charges the high pressure nitrogen gas in the gas chamber 400a as a storage medium, but in the technique described in Japanese Patent Application Laid-Open No. 7-6531, a hydraulic operation using a metal spring, specifically, a plate spring, is substituted for nitrogen gas. An apparatus has been proposed. However, since the energy that can be accumulated per unit volume or unit weight of the metal spring is significantly smaller than that of the gas, the volume and weight occupied by the accumulator are much larger and heavier than the accumulator 400 using gas as a medium. In particular, in order to cope with hydraulic breakers for large-capacity and high-voltage circuit breakers, it is necessary to increase the accumulator energy, but in this case, the weight or volume of the metal spring is greatly increased. Therefore, it is difficult to integrate the whole apparatus in a small size, and there are limitations in that the application of the hydraulic manipulation device is limited to a small and medium capacity model.

Therefore, it is considered advantageous to use a gas having a high pressure energy density as a pressure storage medium in order to achieve compact integration of the hydraulic operation device including the applicability to a large capacity model. At the same time, the pressure of the system is further increased, and the operating energy and the capacity of the gas are reduced due to the improvement of the cutting-off technology. Thus, each element such as the driving unit 20, the accumulator 400, the pump unit 500, etc. is reduced. Miniaturization is considered as one means. For example, as described in Japanese Patent Application Laid-Open No. 63-47094, there is a system in which the hydraulic control unit 30 provides a plurality of valve bodies in one block. However, in such a technique, the structure is complicated, which is likely to be large, leading to an increase in manufacturing cost and assembly cost.

As described above, in the conventional hydraulic operation apparatus, compact integration and cost reduction are strongly desired, but in addition, performance improvement is required. In particular, in order to cope with large-capacity and ultra-high pressure circuit breakers, the aspects of reliability such as stability of operation speed and improvement of stability are emphasized.

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above circumstances, and an object thereof is to provide a highly reliable hydraulic operation apparatus capable of realizing compact integration and stable operation with a simple structure.

BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing which shows one typical Example regarding the whole hydraulic control apparatus by this invention.

2 is a cross-sectional view taken along line Y of FIG.

3 is a cross-sectional view taken along the line X in FIG.

4 is an enlarged cross-sectional view showing an embodiment of a hydraulic control unit in the hydraulic pressure control device according to the present invention.

5 is an enlarged cross-sectional view showing one embodiment of a pressure monitor with a safety valve in the hydraulic operation device according to the present invention.

Fig. 6 is an enlarged sectional view showing one embodiment of a pressure tank in the hydraulic operation device according to the present invention.

Fig. 7 is a sectional view showing the second embodiment of the fixing part on the nitrogen gas chamber side of the accumulator in the hydraulic pressure control device according to the present invention.

8 is an enlarged cross-sectional view showing a second embodiment of a hydraulic control unit in the hydraulic pressure control device according to the present invention.

9 is a configuration diagram showing an example of a hydraulic pressure control device used as a drive source of a conventional circuit breaker.

FIG. 10 is a perspective view showing an example of a layout when the hydraulic operation device shown in FIG. 9 is accommodated in a mechanical box; FIG.

[Description of the code]

10, 10A... Hydraulic actuator

20... Driving part

21. Driven cylinder

21a... Cylinder end

21b. Cylinder head

21c... pipeline

22. Driven piston

23. Driving rod

24. First liquid chamber

25…. 2nd liquid chamber

28. Retaining device

28c... Slide guide

29. guide

30. Hydraulic control

31. Casting valve part

32. Control port

33. Feed port

34. Drainage port

37. Flow adjustment aperture

40, 400... Accumulator

45.. Open solenoid

46. Closed Solenoid

50…. Pump

60... Hydraulic pressure monitor

70... Low pressure tank

In order to achieve the above object, the hydraulic operation apparatus of the present invention has the following configuration in an apparatus including a plurality of components such as a driving unit, a hydraulic control unit, an accumulator, a pump, and a low pressure tank. Herein, the drive unit includes a drive piston slidably mounted therein, a drive rod connecting the drive piston and the opening and closing portion of the breaker, and a first rod formed on the drive side rod and the opposite side of the drive piston in the drive cylinder, respectively. It is provided with a 2nd liquid chamber, It is a means which opens and closes an opening-and-closing part of a circuit breaker by the movement of the said drive piston. The hydraulic pressure control unit is a means for controlling the hydraulic pressure by selectively supplying and discharging the pressure fluid to the second liquid chamber, and the accumulator is a means for always operating the high pressure liquid in the first liquid chamber. The pump is a means for supplying a high pressure liquid to the accumulator, and the low pressure tank is a means for recovering drainage liquid from the second liquid chamber in the drive cylinder and accumulating the low pressure liquid.

First, in the hydraulic operation device of claim 1, the drive cylinder is fixed to the cylinder head on the first liquid chamber side, and the second liquid chamber side is fixed to the cylinder end, and the hydraulic controller is connected to some of these heads, A conduit which is coaxial with the drive cylinder and a double cylinder so as to cover the outside of the drive cylinder, a flow path communicating with the hydraulic control unit formed in the head to which the control unit is connected, and a liquid chamber on the side not adjacent to the head of the drive cylinder. It is characterized in that connected to. In the conventional configuration, it is necessary to arrange the pipelines for supplying the high pressure liquid from the driving cylinder and the accumulator to the first liquid chamber in parallel with high positional accuracy, which makes assembly work difficult. On the other hand, in the invention of claim 1, the difficulty in assembly can be eliminated in order to make the drive cylinder and the conduit a double-cylinder structure, and thus the assembly can be performed easily. In addition, since the space efficiency is also good, it is easy to miniaturize the device.

The invention of claim 2 is characterized in that the accumulator block for fixing the accumulator and a part of the cylinder block for fixing the driving cylinder are integrally installed in the hydraulic pressure control device according to claim 1. In the invention of claim 2 having such a structure, the accumulator-side block and the cylinder-side block can be integrated to achieve miniaturization and strength, and reduce piping connectors and bolts for connecting the two, and reduce costs. Can contribute to

In the invention of claim 3, any one of a liquid supply port through which a hydraulic pressure control unit supplies the high pressure liquid from the accumulator, a control port communicating with the second liquid chamber, a drain port communicating with the low pressure tank, and a liquid supply port and a drainage port And a switching valve for selectively communicating with the control port, a solenoid for operating the switching valve, and a flow rate adjusting means for adjusting the flow rate of the high pressure liquid in the liquid feed port. In the invention of claim 3 having such a configuration, there is an effect that the closing operation speed can be easily adjusted by the action of the flow rate adjusting means.

The invention according to claim 4 is characterized in that, in the liquid pressure operating device according to claim 3, a constant flow rate path capable of flowing a high pressure liquid at a constant flow rate is formed in the liquid supply port. In the invention of claim 4, since the constant flow path always flows a high-pressure liquid at a constant flow rate, it is possible to secure a stable flow rate and to maintain the closing operation speed of the breaker at a certain speed or more.

The invention of claim 5 constitutes a hydraulic pressure control unit from a casting valve unit and a pilot valve unit controlling the casting valve unit, and discharges pressure fluid from a liquid supply valve for supplying pressure fluid to the second liquid chamber and the second liquid chamber. The drainage valve is disposed on almost the same operation shaft of the casting valve portion, and the feed portion is provided with a slide portion and a seal portion that slide like the drainage valve. In the invention of claim 5, when the liquid feed valve is operated, the slide portion and the seal portion operate in communication, so that the same operation as that of the valve in which the slide portion and the seal portion are integrated can be performed. When the drain valve operates, the slide portion of the feed valve slides together with the drain valve so that the slide portion plays a subsidiary role with the drain valve, thereby increasing the valve opening of the drain valve. For this reason, a larger amount of pressure fluid can be discharged than the second liquid chamber, and the opening speed of the breaker can be improved to increase the operating speed.

Invention of Claim 6 is provided with the pressure monitoring part which monitors the hydraulic pressure of the high pressure liquid in an accumulator. The pressure monitoring unit communicates a high pressure flow path through which the high pressure liquid flows from the accumulator, a low pressure flow path that can communicate with the high pressure flow path, and a high pressure flow path and a low pressure flow path when the hydraulic pressure of the high pressure liquid flowing through the high pressure flow path exceeds a predetermined set value. The safety valve which discharge | releases a high pressure liquid from a high pressure flow path to a low pressure flow path, and the stop valve which connects a high pressure flow path and a low pressure flow path, and lowers a set value are provided. In the invention of claim 6 having the above-described configuration, when the pressure monitoring unit adjusts the setting of the pressure monitoring, the stop valve is opened to communicate with the high pressure passage and the low pressure passage so that the pressure set by the pressure monitoring unit can be easily lowered. For this reason, the pressure monitoring setting can be easily adjusted, and the pressure monitoring unit can increase the degree of freedom of the monitoring range.

The hydraulic operation apparatus of claim 7 is configured to divide the low pressure tank. The tank shape by this configuration can facilitate processing. Moreover, according to the low pressure tank which can be divided | segmented, even when attaching additional elements, such as a fascia plate in a low pressure tank, the installation work can be performed simply.

EXAMPLE

EMBODIMENT OF THE INVENTION Hereinafter, the form at the time of implementing the hydraulic operation apparatus by this invention is demonstrated concretely with reference to FIGS. In addition, the hydraulic operation apparatus according to the following embodiment is the same as the conventional example shown in Figs. 9 and 10 and includes a driving unit 20 for driving the opening and closing portion 1 (more specifically, the movable electrode 3) of the circuit breaker. The same members are denoted by the same reference numerals, and description thereof will be omitted. In addition, the structure of the opening-closing part 1 of a circuit breaker is an example, and it is good also as a structure in which the opposing electrode can open and close relatively, and the two opposing electrodes move together.

[One. Embodiment of the entire hydraulic control device]

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows the typical example in the case of applying each invention described in Claim 1, 2, 3, 4, 6, 7 as an Example regarding the whole hydraulic control apparatus by this invention, FIG. Sectional view seen from the arrow Y direction of 1, FIG. 3 is sectional view seen from the arrow X direction of FIG.

[1-1. Overall Configuration of Hydraulic Manipulator 10A]

a: configuration

The cylinder head 21b and the cylinder end part 21a are provided as a cylinder block which fixes the drive cylinder 21 in the drive part 20 of the hydraulic-pressure operation apparatus 10A which concerns on a present Example. As shown in FIG. 3, the hydraulic control part 30 is attached to the upper part of the cylinder end part 21a, and the accumulator 40 is attached or detached in the vicinity of the lower part, respectively. Accumulator 40 is a high-pressure liquid is always acting on the drive unit (20). In the cylinder end 21a, the pump 50 is attached to the lower left part of FIG. 3, the low pressure tank 70 is attached to the upper left part of FIG. 3, and the hydraulic pressure monitor 60 is detachably attached to the right side of FIG. The pump 50 is for supplying a high pressure liquid to the accumulator 40, and the low pressure tank 70 collect | recovers drainage liquid from the drive part 20, and accumulates a low pressure liquid. The hydraulic pressure monitor 60 is a pressure monitoring unit that monitors the hydraulic pressure of the high pressure liquid in the accumulator 40. Each of the above components is integrated into one unit by attaching and detaching the cylinder end portion 21a of the drive unit 20. At this time, the liquid end which communicates with the liquid flow path of each other structure part is comprised in the cylinder edge part 21a.

b: action effect

In the hydraulic pressure control device 10A having the above-described overall configuration, the hydraulic pressure control unit 30, the accumulator 40, the pump 50, the hydraulic pressure monitor 60, and the low pressure tank are connected to the cylinder end portion 21a of the drive unit 20. Since 70) is detachably attached, the piping which connects each part is unnecessary compared with the conventional hydraulic operation apparatus. As a result of the elimination of such pipes, the configuration can be simplified compared to the conventional one, and the compact integration of the entire apparatus is realized. From this, production efficiency can be improved and manufacturing cost and assembly cost can be reduced, which is economically advantageous. In addition, since the hydraulic pressure transmission path can be shortened as compared with the case where the pipes are used, the response is improved.

Subsequently, each component of 10 A of hydraulic operation apparatus is demonstrated individually. In addition, the operation | movement of each part is mentioned later as operation | movement of the whole apparatus.

[1-2. Drive unit 20]

a: configuration

As shown in FIG. 1 and FIG. 2, the drive part 20 is provided with the line 21c so that it may become a double cylinder coaxially and double so that the outer side of the drive cylinder 21 may be covered. This pipe line 21c is for supplying a high pressure liquid from the accumulator 40 to the first liquid chamber 24. Moreover, the guide 29 for fixing the drive cylinder 21 to the same shaft as the pipe line 21c is provided in the cylinder head 21b side. Moreover, the cylinder head 21b is equipped with the holding device 28 for maintaining the state of the drive piston 22, and maintaining a closed state, when the hydraulic pressure falls in the closed state of a circuit breaker.

As shown in FIG. 1, the holding device 28 is comprised from the state holding piston 28a, the spring 28b, and the slide guide 28c. The state glass piston 28a is a piston having a liquid seal for fixing the drive piston 22 when the hydraulic pressure decreases, and the spring 28b is in the direction of extruding the state retention piston 28a toward the drive piston 22 side. It is meant to exert strength. In addition, the slide guide 28c guides the slide of the state holding piston 28a and comes into contact with the drive cylinder 21.

b: action effect

In the double cylinder configuration by the conduit 21c and the drive cylinder 21, the positional relationship between the cylinder head 21b and the cylinder end 21a can be easily assembled without being strictly specified, and the space efficiency is also high. Get good. Moreover, by lengthening the axial direction of the drive cylinder 21 sufficiently long compared with the pipe line 21c, after confirming assembly of the drive cylinder 21, the pipe line 21c can be assembled and it is also possible to further improve assembly property. In addition, in the holding device 28, the slide guide 28c is in contact with the driving cylinder 21, so that the rotation of the driving cylinder 21 can be suppressed, and the state holding piston 28a is in contact with and fixed to the driving cylinder 21a. Can be avoided.

[1-3. Hydraulic control unit 30]

a: configuration

The hydraulic control part 30 is demonstrated using FIG. 4 in addition to FIGS. 1-3. 4 is an enlarged cross-sectional view illustrating the hydraulic control unit 30 of FIG. 1. As shown in FIG. 4, the hydraulic pressure control unit 30 always controls the high pressure liquid from the control port 32 and the accumulator 40 to selectively supply and discharge pressure fluid to the second liquid chamber 25 of the driving unit 20. Is provided with a liquid supply port 33 for supplying via the cylinder end portion 21a and a drain port 34 communicating with the low pressure tank 70. In addition, a switching valve 39 for opening and closing between the control port 32 and the liquid supply port 33 or between the control port 32 and the drainage port 34 is provided. The switching valve 39 is slide guided by the valve blocks 38a and 38b and the switching valve 39 is in contact with the angular portions of the valve blocks 38a and 38b to switch the opening and closing between the ports. .

The opening solenoid 45 and the closing solenoid 46 are installed adjacent to the switching valve 39. When the solenoid 45 or the solenoid 46 is excited by the operation command, the respective shaft 45a and the shaft ( 46a) is operated so that the switching valve 39 may operate. Bolts 45b and 46b are attached to each solenoid 45 and 46, and these bolts 45b and 46b fix the position in the rotational direction of the valve block 38a and 38b and define the position of the horizontal hole at all times. Doing. In addition, conduits 45c and 46c are formed in the solenoids 45 and 46.

Moreover, the fixed amount flow path 33a and the flow volume adjustment flow path 33b are provided in the liquid feed port 33 side. The constant flow path 33a is configured to supply a fixed amount of the working liquid, and the flow rate adjustment flow path 33b is provided with an adjustment stop 37 for adjusting the operation speed with the opening of the breaker. The flow rate adjusting diaphragm 37 is provided with a bolt 37a protruding to the outside, and the speed adjusting diaphragm 37 is adjusted by operating the bolt 37a from the outside. In addition, the code | symbol 38 in a figure is a block which comprises the hydraulic control part 30. As shown in FIG.

b: action effect

In the hydraulic control unit 30 having the above configuration, it is possible to ensure a stable flow rate from the flow passage that constantly flows a constant flow rate, so that the closing operation speed of the circuit breaker can be maintained at a certain level or more, and the closing operation speed is achieved by the flow adjustment flow passage. The fine adjustment of is easily performed. In addition, in the hydraulic control unit 30, even when the hydraulic fluid leaks from the sealing parts 39a and 39b of the switching valve 39, the solenoid can be quickly discharged from the pipelines 45c and 46c. (45, 46) damage can be prevented.

[1-4, Accumulator 40]

a. Configuration

In the accumulator 40 shown in FIG. 1 and FIG. 3, the block which becomes an accumulator fixing part is provided integrally with the cylinder edge part 21a, and is fixed to the cylinder edge part 21a. The accumulator 40 has an accumulator piston slidably inserted inside the vessel, and a nitrogen gas chamber for filling high pressure nitrogen gas on one side of the accumulator piston is formed inside the vessel and at the same time accumulates the high pressure working fluid on the opposite side. A liquid chamber is formed. And the high pressure operating liquid is accumulated using the compressed energy of this nitrogen gas.

b. Effect

In order to connect the block which fixes the accumulator 40 and the cylinder end 21a, piping connector, a bolt, etc. can be reduced, and it can integrate, and can be miniaturized and strength can be improved.

[1-5. Pump (50)]

a. Configuration

The pump 50 shown in FIG. 3 is comprised by the pump main body and the motor which drives a pump. This pump 50 is directly attached to the cylinder end 21a as shown in FIG. 3 and is sucked into the pump 50 via the filter 75 and inlet port 55 shown in FIG. The high pressure liquid is supplied to the 1st liquid chamber 24 of the drive part 20 through the accumulator 40, the liquid supply port 33 of the hydraulic pressure control part 30, and the conduit 21c.

b. Effect

In the opening / closing operation of the hydraulic pressure control device 10A, the high pressure liquid is consumed in accordance with the operation, and the liquid pressure in the accumulator chamber lowers, but the drainage collected in the low pressure tank 70 is discharged to the filter 75 and the suction port. The pump 50 can inhale via 55 and can be boosted again by the start of the pump 50.

1-6. Hydraulic pressure monitor (60)]

a: configuration

The hydraulic monitor 60 is demonstrated using FIG. 5 in addition to FIGS. 1-3. 5 is an enlarged cross-sectional view illustrating the hydraulic pressure monitor 60 of FIG. 2. The hydraulic monitor 60 is provided with a case 61, and the case 61 has a high pressure flow passage 61a for introducing a high pressure liquid from the accumulator 40 side and a low pressure flow passage 61b that can communicate with the high pressure flow passage 61a. Formed.

In addition, a piston 62 is provided in the case 61. The piston 62 is displaced in accordance with the hydraulic pressure of the high pressure flow path 61a and the compression force of the spring 62a provided on the rear surface. Moreover, the some adjustment screw 65 interlocking with the piston 62 is provided, and the displacement switch 66 for detecting the displacement of the adjustment screw 65 in proximity to this adjustment screw 65 is arrange | positioned.

Moreover, the safety valve 63 and the stop valve 64 are provided between the high pressure flow path 61a and the low pressure flow path 61b. Moreover, the adjusting screw 67 is attached to the case 61, and the adjustment screw 67 is provided with the seat part 67a which contact | connects the safety valve 63. As shown in FIG. The safety valve 63 and the piston 62 are always provided with a gap in the axial direction, and the safety valve 63 is operated by the action of the spring 63a and the high pressure fluid flowing into the piston 62 from the high pressure flow path 61a. Is sealed in contact with the seat portion 67a of the adjustment screw 67. The safety valve 63 communicates the high pressure flow passage 61a and the low pressure flow passage 61b when the hydraulic pressure of the high pressure liquid flowing through the high pressure flow passage 61a exceeds a predetermined set value so that the high pressure liquid flows from the high pressure flow passage 61a to the low pressure. It discharges to the flow path 61b. The stop valve 64 communicates the high pressure flow path 61a and the low pressure flow path 61b to lower the set value.

b: action effect

In the hydraulic pressure monitor 60 which has this structure, the hydraulic pressure of the liquid storage chamber of the accumulator 40 can be always monitored based on the displacement amount of the piston 62, and the load characteristic of the spring 62a. More specifically, when the hydraulic pressure in the liquid storage chamber 42 falls below the prescribed value, the displacement switch 66 is operated to control the signal to the hydraulic control unit 30 and the pump 50 by the displacement switch 66. Operation and stop control can be performed. At this time, since the adjustment screw 65 is provided corresponding to each of the plurality of displacement switches 66, the setting of the hydraulic pressure when each displacement switch 66 is turned on and off can be easily adjusted.

With the rise of the hydraulic pressure, the safety valve 63 is sealed to some extent even if the piston 62 is displaced in the compression direction of the spring 62a and the gap between the safety valve 63 and the piston 62 decreases. To keep it. When the hydraulic pressure rises further, the gap disappears and the safety valve 63 and the piston 62 contact each other, the safety valve 63 is pushed up by the piston 62 to open the seat 67a of the adjustment screw 67. do. At this time, since the high pressure liquid flows out from the high pressure flow path 61a to the low pressure flow path 61b, the increase in the hydraulic pressure is suppressed. When the hydraulic pressure is lower than or equal to the set value, the piston 62 performs an inverting operation, and a gap is again generated between the safety valve 63 and the piston 62 so that the safety valve 63 contacts and seals the seat portion 67a. In this way, it is possible to avoid that the hydraulic pressure becomes very high. Moreover, the seat part 67 can be moved with the adjustment screw 67, and the gap between the safety valve 63 and the piston 62 can be adjusted. For this reason, the hydraulic pressure which the safety valve 63 opens can be set easily.

Moreover, the stop valve 64 provided in the hydraulic pressure monitor 60 functions to discharge | release a high pressure liquid to a low pressure flow path, etc. in the stop of the hydraulic operation apparatus 10, etc., and it acts to lower a pressure. The stop valve 64 is normally closed, but when the pressure is released, the high pressure flow path 61a and the low pressure flow path 61b can be communicated by opening the stop valve 64. By providing such a stop valve 64 in the hydraulic pressure monitor 60, when the setting of the displacement switch 66 and the safety valve 63 in the hydraulic pressure monitor 60 is performed by the hydraulic pressure monitor 60, the stop valve 64 is easy. Pressure can be lowered. For this reason, a pressure can be set freely and the pressure monitoring setting adjustment can be performed simply.

1-7. Low pressure tank (70)]

a. Configuration

The low pressure tank 70 is demonstrated using FIG. 6 in addition to FIGS. 1-3. 6 is an enlarged sectional view showing the case where the low pressure tank of FIGS. 1 to 3 is seen from the surface of FIG. The low pressure tank 70 communicates with the hydraulic pressure control unit 30 by the conduit 76 shown in FIG. 3, and the pump 50 passes through a filter 75 and a suction port 55 for filtering foreign substances in oil, and the like. 50). Moreover, the air breezer 72 is provided in the upper surface of the low pressure tank 70, and the internal air retention part 70d and external air are always in communication with this. The low pressure tank 70 is provided with a rod-shaped liquid level meter 71 for measuring the liquid level. Moreover, the bottom tank 70 shown in FIG. 6 is comprised so that a tank part 70a and the bottom plate part 70b can be divided | segmented.

b. Effect

For example, even when the low pressure tank 70 does not take the shape of a cylinder or a rectangular parallelepiped, which is the simplest shape by a type such as the hydraulic control unit 30, the low pressure tank 70 is formed of the tank portion 70a and the low pressure tank. Since it can divide | segment into plate part 70b, the process formation can also be performed easily also when installing additional elements, such as a digging board, in the filter 75 or a low pressure tank. When the operating liquid flows into the low pressure tank 70 at the time of opening operation, the breaker plate is mixed with air in the low pressure tank 70 to supply the operating liquid containing a large amount of air into the pump 50 depending on the inflow situation. Therefore, it is impossible to increase the pressure in the pump 50 due to the influence of air, and in another inflow situation, the working liquid is ejected from the air breather 72 by ejecting the working fluid very hardly. will be. In addition, since the air reservoir 70d in the low pressure tank 70 communicates with the atmospheric pressure by the air bridger 72, the air retention portion 70d is maintained at the atmospheric pressure, so that the pressure rise or decrease in the low pressure tank 70 does not occur due to the liquid level change. Do not. In addition, the stepped portion 70c for fixing the filter 75 can also be easily configured. In addition, the bottom plate portion 70b can be provided without attaching the remaining working liquid during disassembly of the low pressure tank 70 by providing the attachment portion.

[2. Operation of Hydraulic Manipulation Device]

Hereinafter, the operation of the hydraulic pressure control device 10A shown in FIGS. 1 to 6 will be described mainly with the operation of the driving unit 20 and the hydraulic control unit 30.

2-1. Decommissioned state]

1 and 4 show the energized state of the opening and closing part 1, that is, the closed state of the hydraulic operation apparatus 10A. The accumulator 40 accumulates the hydraulic pressure supplied from the pump 50 by using the compressibility of the nitrogen gas chamber in the nitrogen gas chamber acting on the liquid storage chamber via the accumulator piston. The accumulator 40 constantly operates the high pressure liquid to the first liquid chamber 24 of the drive unit 20 via the liquid supply port 33 and the pipeline 21c of the hydraulic control unit 30.

On the other hand, as shown in FIG. 4, in the hydraulic control part 30, the control port 32 and the liquid supply port 33 communicate with the switching valve 39. As shown in FIG. Therefore, the high pressure liquid also acts on the surface of the drive piston 22 on the second liquid chamber 25 side. In this manner, in the closed state, the high pressure liquid acts not only on the surface of the first liquid chamber 24 side of the drive piston 22 but also on the surface of the second liquid chamber 25 side. For this reason, the drive piston 22 is maintained in the closed position as shown in FIG. 1 by the hydraulic working area difference in the surface on both sides.

2-2. Acting as a dog]

In the closed state as described above, when the opening command signal is given to the opening solenoid 45 of the hydraulic control unit 30 of FIG. 4, the shaft 45a in the solenoid presses the switching valve 39, and the switching valve 39 switches the flow path. The control port 32 and the drainage port 34 communicate with each other by the operation. As a result, since the hydraulic pressure in the 2nd liquid chamber 25 of the operation part 20 falls, the drive piston 22 is driven to the left side in FIG. 1 by the high pressure liquid of the 1st liquid chamber 24, and it interposes through the drive rod 23. As shown in FIG. The movable electrodes 3 connected to each other are opened. As the drive piston 22 moves during this opening operation, the low pressure tank 70 recovers the drainage in the second liquid chamber 25 from the hydraulic pressure control unit 30 via the pipeline 76.

[2-3. Dog status]

As described above, the pressure fluid acts only on the surface of the first liquid chamber 24 side of the drive piston 22 in the open state after the end of the open operation. For this reason, the drive piston 22 is maintained in the open position by the pressure difference on both sides.

2-4. Decommissioning]

In the open state as described above, when the closing command signal is supplied to the opening solenoid 46 of the hydraulic control unit 30 of FIG. 4, the shaft 46a in the solenoid presses the switching valve 39, and the switching valve 39 switches the flow path. The control port 32 and the liquid supply port 33 communicate with each other by the operation. As a result, the high pressure liquid flows into the second liquid chamber 25 of the driving unit 20, and the driving piston 22 is driven to the right side in FIG. 1 by the high pressure liquid of the second liquid chamber 25, thereby driving the driving rod 23. The movable electrode 3 connected via) is closed and returns to the state of FIG. 1.

[3. Another embodiment]

Although the above description demonstrated one typical form related to the whole hydraulic control apparatus, the other embodiment is demonstrated concretely with reference to FIG. 7, FIG.

3-1. Second Embodiment Regarding Accumulator Fixing Unit]

a. Configuration

7 is a view showing a second embodiment of the accumulator fixing part. The accumulator 40 is provided with a block serving as an accumulator fixing unit integrated with the cylinder head 21. In this configuration, the high pressure liquid accumulated in the accumulator 40 acts directly on the first liquid chamber 24 and acts on the liquid supply port 33 of the hydraulic control unit 30 via the pipeline 21c. The port 50 communicates via the pipeline 21c.

b. Effect

According to the above structure, even when the capacity | capacitance of the accumulator 40 is large-capacity and extended in the axial direction, it mounts directly to the drive part 20, and the compaction of the hydraulic control apparatus 10 becomes possible.

3-2. Second Embodiment Regarding Hydraulic Control Unit]

a. Configuration

8 is a second embodiment of the hydraulic control unit. This hydraulic control unit 30 is different from the hydraulic control unit shown in FIG. 4, for example, in order to cope with when the driving energy of the hydraulic operation unit 10 increases, a two-stage hydraulic control unit (pilot valve unit, casting valve unit) The example of the structure of the casting valve part 31 at the time of installing () is shown. Although the pilot valve part is not shown here, it is common to have a switching valve, an opening solenoid for switching the same, and a closing solenoid as shown in FIG. 4. The liquid supply port, the control port, and the liquid discharge port of this pilot valve part communicate with the operation liquid supply port A33, the operation control port A32, and the operation drainage port A34 of the casting operation valve part 31, respectively.

The casting valve part 31 receives the constant pressure of the high pressure liquid from the control port 32 and the accumulator 40 which selectively supplies and discharges the pressure fluid to the second liquid chamber 25 of the drive part 30. The liquid supply port 33 supplied through 21a) and the drain port 34 which communicate with the low pressure tank 70 through the inner pipe path 76 of the cylinder edge part 21c are provided. In addition, as shown in FIG. 8, a liquid supply valve 35 for opening and closing between the control port 32 and the liquid supply port 33, and a drain valve 36 for opening and closing between the control port 32 and the drainage port 34. Is provided, and this liquid feed valve 35 and the drain valve 36 are provided on the same operation shaft.

That is, as shown in FIG. 8, the head part 35a is formed in the edge part which faces the drain valve 36 of the liquid feed valve 35, and this head part 35a is provided in the drain valve 36 The inside of the part is slidable. The head part 35a of the liquid feed valve 35 is provided with a guide ring 35b for preventing scratches during slide of the liquid feed valve 35 and the drain valve 36 and for reducing slide resistance. Reference numeral 35c in the figure denotes a sheet portion that prevents the connection between the control port 32 and the liquid supply port 33. That is, the liquid feed valve 35 is divided into two parts, the head part 35a and the seat part 35c.

Moreover, the spring chamber 36a is provided in the operation control port A32 which communicates with the pilot valve part in the head part 35a of the liquid feed valve 35, and the back part of the drain valve 36, The spring 36b for closing the drain valve 36 at the time of normality is accommodated in the spring chamber 36a. By supplying or discharging the pressurized liquid to the spring chamber 36a, the liquid feed valve 35 or the drain valve 36 are independently opened and closed.

A spring chamber 35d is also provided in the distribution of the liquid feed valve 35, and a spring chamber 35e for closing the liquid feed valve 35 at the time of normal operation is housed in the spring chamber 35d. The liquid supply valve 35 communicates with the spring chamber 35d and the control port 32 via the seat portion 35c so that the pressurized liquid of the spring chamber 35d does not interfere with the operation of the liquid feed valve 35. A conduit 35f is formed.

Moreover, two stops are comprised in the liquid feed port 33 in order to change the flow path area of the liquid feed port 33, and to adjust the closing operation speed of a circuit breaker. One is the flow regulation fixed aperture 37b, and the other is the flow regulation variable aperture 37 provided in the vicinity of the wake of the flow regulation fixed aperture 37b. Reference numeral 37a in the figure denotes a port which protrudes outward from the variable diaphragm 37 for adjusting the flow rate. The variable diaphragm 37 for adjusting the flow rate is adjusted by operating the port 37a from the outside.

b. Dog behavior

In the opening operation, the switching valve of the pilot valve section performs the switching operation by the command signal of the opening solenoid of the pilot valve section. For this reason, the pressurized liquid of the spring chamber 36a which was high in the closed state is discharged from the operation control port A32 through the pilot valve part, the operation drainage port A34, and the drainage port 34, Pressure drops. As a result, the drain valve 36 is operated at a pressure difference between the high pressure control port 32 and the control port 32 and the drain port 34 communicate with each other, so that the pressure in the second liquid chamber 24 of the drive cylinder 20 is increased. The drive piston 22 operates to lower the movable electrode 3 to open. At this time, together with the operation of the drain valve 36, the head portion 35a of the feed valve 35 also operates in the same manner and is pressed in the direction of opening the drain valve 36, thereby increasing the opening degree of the drain valve 36. And responsiveness at the time of opening operation becomes favorable. In addition, the drain valve 36 is moved by the spring force to balance the pressure before and after the end of the operation and closes between the drain port 34 and the control port 32.

c. Decommissioning action

On the other hand, in the closing operation, the switching valve of the pilot valve section performs a switching operation in response to a command signal of the closing solenoid for the pilot valve section. Therefore, the pressurized liquid is supplied from the liquid feed port 32 to the spring chamber 36a, which was low in the open state, through the operation liquid supply port A33, the pilot valve portion, and the operation control port A32 to the spring chamber 36a. Pressure rises. By this pressure, the head part 35a of the liquid feed valve 35 is pressed to operate the liquid feed valve 35 so that the control port 32 and the liquid feed port 33 communicate with each other, so that the second liquid chamber 24 of the drive cylinder 20 is carried out. ), The pressure increases, and the driving piston 22 operates to move the movable electrode 3 to the closing operation. At this time, the liquid supply valve 35 operates integrally with the head portion 35a and the sealing portion 35c. In addition, the drain valve 35 is moved by the spring force in order to balance the pressure before and after the end of the operation and closes between the liquid supply port 33 and the control port 32.

d. Effect

In the casting valve part 31 having the above-described configuration, it is possible to use as a hydraulic control part of hydraulic operation apparatuses of various various capacities by using one type of casting valve part in changing the aperture diameter of the flow control fixed aperture 37b. have. In addition, the adjustment of the minute closing operation speed can be performed by the flow rate adjustable variable stop 37 by operating the port 37a from the outside.

In addition, this invention is not limited to each said Example, It can implement in various other forms within the scope of this invention. That is, the specific structure of a drive part, a hydraulic control part, an accumulator, a pump, a pressure monitoring part, a low pressure tank, etc. can be selected suitably.

As described above, according to the present invention, it is possible to configure a structure such as a driving unit, a hydraulic control unit, an accumulator, a pump, and a low pressure tank in a simple structure, and to provide a reliable hydraulic pressure that can stably operate by improving the performance of the hydraulic control unit. An operation device can be provided.

Claims (7)

A hydraulic pressure control device for opening and closing an opening and closing portion in a breaker, comprising: a driving cylinder, a driving piston slidably inserted into the driving cylinder, a driving rod connecting the driving piston and the opening and closing portion of the breaker, and the driving piston. A first liquid chamber and a second liquid chamber respectively formed on the driving rod side and the opposite side of the driving cylinder, and a hydraulic control section for selectively controlling the pressure in the liquid chamber by supplying and discharging pressure fluid in the second liquid chamber; A hydraulic pressure including an accumulator for constantly operating a high pressure liquid with respect to the first liquid chamber, a pump for supplying a high pressure liquid to the accumulator, and a low pressure tank for recovering drainage liquid from the second liquid chamber and accumulating low pressure liquid. In the operating device, The drive cylinder has the first liquid chamber side fixed to the cylinder head, the second liquid chamber side fixed to the cylinder end portion, the hydraulic pressure control unit is connected to some of these heads, and the hydraulic pressure control unit is formed on the head A hydraulic pressure connecting the flow path communicating with the hydraulic control unit and the liquid chamber on the side not adjacent to the head of the drive cylinder are connected to the drive cylinder coaxially and in a double cylinder so as to cover the outside of the drive cylinder. Operation device. The method of claim 1, And an accumulator block for fixing the accumulator and a part of the cylinder block for fixing the driving cylinder are integrally installed. A hydraulic pressure control device for opening and closing an opening and closing portion in a breaker, comprising: a driving cylinder, a driving piston slidably inserted into the driving cylinder, a driving rod connecting the driving piston and the opening and closing portion of the breaker, and the driving piston. A first liquid chamber and a second liquid chamber respectively formed on the driving rod side and the opposite side of the driving cylinder, and a hydraulic control section for selectively controlling the pressure in the liquid chamber by supplying and discharging pressure fluid in the second liquid chamber; A hydraulic pressure including an accumulator for constantly operating a high pressure liquid with respect to the first liquid chamber, a pump for supplying a high pressure liquid to the accumulator, and a low pressure tank for recovering drainage liquid from the second liquid chamber and accumulating low pressure liquid. In the operating device, The hydraulic control section is provided with a liquid supply port for introducing a constant high pressure liquid from the accumulator, a control port for communicating with the second liquid chamber, and a drainage port for communicating with the low pressure tank, and any of the liquid supply port and the drainage port A switching valve for selectively communicating with the control port, and a solenoid for operating the switching valve, And a flow rate adjusting means for adjusting the flow rate of the high pressure liquid is provided in the liquid supply port. The method of claim 3, wherein And a constant amount flow path is formed in the liquid supply port to allow a high pressure liquid to flow at a constant flow rate at all times. A hydraulic pressure control device for opening and closing an opening and closing portion in a breaker, comprising: a driving cylinder, a driving piston slidably inserted into the driving cylinder, a driving rod connecting the driving piston and the opening and closing portion of the breaker, and the driving piston. A first liquid chamber and a second liquid chamber respectively formed on the driving rod side and the opposite side of the driving cylinder, and a hydraulic control section for selectively supplying and discharging pressure fluid in the second liquid chamber to control the hydraulic pressure in the liquid chamber; A hydraulic pressure including an accumulator for constantly operating a high pressure liquid with respect to the first liquid chamber, a pump for supplying a high pressure liquid to the accumulator, and a low pressure tank for recovering drainage liquid from the second liquid chamber and accumulating low pressure liquid. In the operating device, The hydraulic control unit is composed of a casting operation valve unit and a pilot valve unit for controlling the casting operation valve unit, In the casting valve unit, a liquid supply valve for supplying a pressure fluid to the second liquid chamber and a drain valve for discharging the pressure fluid from the second liquid chamber are disposed on substantially the same operation shaft, The liquid supply valve is provided with a slide portion that slides together with the drain valve and a sealing portion that opens and closes as a valve. A hydraulic pressure control device for opening and closing an opening and closing portion in a breaker, comprising: a driving cylinder, a driving piston slidably inserted into the driving cylinder, a driving rod connecting the driving piston and the opening and closing portion of the breaker, and the driving piston. A first liquid chamber and a second liquid chamber respectively formed on the driving rod side and the opposite side of the driving cylinder, and a hydraulic control section for selectively supplying and discharging pressure fluid in the second liquid chamber to control the hydraulic pressure in the liquid chamber; A hydraulic pressure including an accumulator for constantly operating a high pressure liquid with respect to the first liquid chamber, a pump for supplying a high pressure liquid to the accumulator, and a low pressure tank for recovering drainage liquid from the second liquid chamber and accumulating low pressure liquid. In the operating device, A pressure monitoring unit for monitoring the hydraulic pressure of the high pressure liquid in the accumulator is provided, The pressure monitoring unit includes a high pressure flow path that flows high pressure liquid from the accumulator, a low pressure flow path that can communicate with the high pressure flow path, and a high pressure flow path and a low pressure flow path when the hydraulic pressure of the high pressure liquid flowing through the high pressure flow path exceeds a predetermined set value. And a safety valve for communicating the high pressure liquid from the high pressure passage to the low pressure passage, and a stop valve for communicating the high pressure passage with the low pressure passage to lower the set value. A hydraulic pressure control device for opening and closing an opening and closing portion in a breaker, comprising: a driving cylinder, a driving piston slidably inserted into the driving cylinder, a driving rod connecting the driving piston and the opening and closing portion of the breaker, and the driving piston. A hydraulic pressure control section for controlling the hydraulic pressure in the liquid chamber by selectively supplying and discharging pressure fluid from the first and second liquid chambers respectively formed on the driving rod side and the opposite side of the driving cylinder, and the second liquid chamber. And an accumulator for constantly operating the high pressure liquid with respect to the first liquid chamber, a pump for supplying the high pressure liquid to the accumulator, and a low pressure tank for recovering drainage liquid from the second liquid chamber and accumulating low pressure liquid. In the hydraulic operation device, A hydraulic pressure operating device, characterized in that the low pressure tank is configured to be divided.