CN1299014C - Hydraulic activator - Google Patents
Hydraulic activator Download PDFInfo
- Publication number
- CN1299014C CN1299014C CNB01118518XA CN01118518A CN1299014C CN 1299014 C CN1299014 C CN 1299014C CN B01118518X A CNB01118518X A CN B01118518XA CN 01118518 A CN01118518 A CN 01118518A CN 1299014 C CN1299014 C CN 1299014C
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- Prior art keywords
- valve
- mentioned
- liquid discharging
- liquid
- spring
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/02—Details
- H01H33/28—Power arrangements internal to the switch for operating the driving mechanism
- H01H33/30—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator
- H01H33/302—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator for fluid insulated switchgear, wherein the insulating fluid is also the working fluid
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/02—Details
- H01H33/53—Cases; Reservoirs, tanks, piping or valves, for arc-extinguishing fluid; Accessories therefor, e.g. safety arrangements, pressure relief devices
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/02—Details
- H01H33/28—Power arrangements internal to the switch for operating the driving mechanism
- H01H33/30—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator
- H01H2033/308—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator comprising control and pilot valves
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- Fluid-Driven Valves (AREA)
- Fluid-Pressure Circuits (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
The present invention relates to a fluid pressure operating device in which the structure is simple and an actuation time can be easily adjusted and a stable action is possible and which has a high reliability. The fluid pressure operating device equipped with a pilot valve part to control outputs of the main operating valve part and an operating valve. The main operating valve part has a drainage valve and a liquid supplying valve. The drainage valve slides with an inner circumferential face of a cylindrical case and select whether it supplies the working fluid to the driving part or not by separating from and abuting on a seal part. Accordingly, the time to be consumed for the fabrication can be shortened without difficult processing.
Description
Technical field
The present invention relates to apply device, this apply device uses as the driving source that carries out the circuit breaker switching action.
Background technique
In recent years, along with the increase of electricity needs, also cause the high capacity and the ultrahigh pressureization of transmission system.Thereupon, the circuit breaker that adopts in the power transmission system is to use SF
6Gas isolated gas-break switch accounts for main flow.Carrying out the driving source of this circuit breaker switching action, is to adopt the operation equipment that utilizes fluids such as gas or liquid.But wherein be the operation equipment of driving source with gas (pressurized air), high capacity and ultrahigh pressureization along with power transmission system, driving force enlarges markedly, so the equipment of air cylinder and air groove etc. also maximizes, in addition, supply and exhaust sound during operation is also big, so, silencer must be arranged, make equipment complicated.
On the other hand, adopt the liquid driven source operation equipment, be apply device, have following advantage.That is, liquid is compared with gas, realizes high pressure, high-power easily, so the miniaturization of implement device easily.That is,, have good responsiveness, in addition, the time do not have the supply and exhaust sound in operation by the incompressibility of liquid, but the noise during display operation.Therefore, require the driving source of apply device, and require to improve more performance as high capacity and ultrahigh pressure circuit breaker.
Below, the conventional example of this apply device is described with reference to Fig. 9.
As shown in Figure 9, circuit breaker switching portion 1 is made of fixed electrode 2 and movable electrode 3.Movable electrode 3 is being connected with the drive portion 5 of apply device 4.The drive portion 5 of apply device 4, by drive cylinder pressure 6, slidably insert its inner driven plunger 7, this driven plunger 7 is constituted with the driveshaft 8 that circuit breaker side movable electrode 3 is connected.
Space in driving cylinder pressure 6 as movable next door, at driveshaft 8 sides (movable electrode 3 sides) and its opposition side, forms the 1st liquid chamber 9 and the 2nd liquid chamber 10 respectively with driven plunger 7.Hydraulic control portion 11 is connected with the 2nd liquid chamber 10.Hydraulic control portion 11 is mechanisms of hydraulic pressure in the control liquid chamber 10, selectively carries out the supply and the discharge of the working liquid body (pressure fluid) in the 2nd liquid chamber 10.This hydraulic control portion 11 is provided with main operation valve portion 12 and pilot valve portion 13, the row of giving of main operation valve portion 12 Control work liquid, and pilot valve portion 13 is as the switching valve that drives this main operation valve.This switching valve is by drivings such as solenoids.Between this hydraulic operation portion 11 and the 1st liquid chamber 9, connect with stream 14.
To the liquid-storage container 15 (pressure accumulater) of the 1st liquid chamber 9 long duration of action high pressure liquid, be connected with the 1st liquid chamber 9 by high pressure stream 16.The working liquid body of discharging during driven plunger 7 actions is recovered to trough of low pressure 17, behind oil hydraulic pump 18 high-pressure trends, is re-supplied to liquid-storage container 15.
Main operation valve portion 12, the structure that adopts the flat 10-160155 communique of Japanese Patent Application to propose.That is, main operation valve portion 12 has control mouth 19, feeding mouth 20 and liquid port 22.The 2nd liquid chamber 10 of control mouthful 19 pairs of drive portions 5 carries out the supply and the discharge of pressure fluid selectively.The high pressure liquid that feeding mouth 20 is supplied with from liquid-storage container 15.Liquid port 22 is communicated with trough of low pressure 17 by low pressure stream 21.In addition, also be provided with the liquid discharging valve 24 of 22 of the feeding valve 23 that is used for 20 in open and close controlling mouth 19 and feeding mouth and open and close controlling mouth 19 and liquid ports, this feeding valve 23 and liquid discharging valve 24 are located on the same action axle.
Feeding valve 23, with liquid discharging valve 24 end in opposite directions, form head 25, this head 25 can slide in the recess on being located at liquid discharging valve 24 26.At the head 25 of feeding valve 23, be provided with the lead ring 27 that is used to reduce the slip resistance.
At the back of the head 25 and the liquid discharging valve 24 of feeding valve 23,, be provided with spring housing 29 in the operation control that is communicated with pilot valve portion 13 mouthfuls 28.The spring 30 that is used for closing when usual liquid discharging valve 24 is being accommodated in inside in this spring housing 29.By this spring housing 29 is supplied with or head pressure liquid, liquid supply valve 23 or liquid discharging valve 24 are driven switching respectively independently.
Back at feeding valve 23 also is provided with spring housing 31, and the spring 32 that is used for closing when usual feeding valve 23 is being accommodated in the inside in this spring housing 31.For the pressured fluid that makes this spring housing 31 does not hinder the action of feeding valve 23, on feeding valve 23, form by sealed department 33 spring housing 31 and control mouth 19 streams that are communicated with.
Pilot valve portion 13 has operation control mouth 28, operation feeding mouth 35 and operation liquid port 36.The back of operation control mouthful 28 pairs of liquid discharging valves 24 is selectively supplied with and the head pressure fluid.The high pressure liquid that operation feeding mouth 35 is supplied with from liquid-storage container 15.Operation liquid port 36 is communicated with trough of low pressure 17 by low pressure stream 21.In addition, also be provided with and be used between opening and closing operations control mouthfuls 28 and the operation feeding mouth 35 or operation control mouthfuls 28 and operate switching valve 37 between the liquid port 36.This switching valve 37 is slided by valve body 38,39 guidings, and the bight of switching valve and valve body 38,39 joins, and the switching of carrying out between each mouthful is switched.
Be adjacent to be provided with open circuit solenoid 40 and closed circuit with switching valve 37 with solenoid 41, when solenoid is accepted action command by excitation, but each moving plate 42 action, switching valve 37 actions.
The following describes the on-off action of this apply device.
In open circuit action, when open circuit with solenoid 40 during by excitation, switching valve 37 actions are closed between the operation control of pilot valve portion 13 mouthfuls 28 and the operation feeding mouth 35, operation control mouthfuls 28 and operations platoon drip and open between the mouth 36.So, during closed circuit state the pressured fluid of back spring housing 29 of liquid discharging valve 24 of the main operation portion 12 of high pressure, by pilot valve portion 13, discharge, so the pressure of spring housing 29 reduces towards trough of low pressure 17.Like this, by with the pressure difference of the control mouth 19 of high pressure, liquid discharging valve 24 actions, control mouthfuls 19 are communicated with liquid port 22.So the pressure that drives the 2nd liquid chamber 10 of cylinder pressure 6 reduces, driven plunger 7 actions, movable electrode 3 action of opening a way.In addition, after liquid discharging valve 24 releases, because the pressure balance of front and back so move under the spring force effect, is closed liquid port 22 and 19 in control mouth.
In closed circuit action, with solenoid 41 during by excitation, switching valve 37 actions are opened between the operation control of pilot valve portion 13 mouthfuls 28 and the operation feeding mouth 35 when closed circuit, operation control mouthfuls 28 and operate between the liquid port 36 and close.So pressured fluid is by pilot valve portion 13, when supplying to open-circuit condition the back spring housing 29 of liquid discharging valve 24 of the main operation portion 12 of low pressure, so the pressure of spring housing 29 raises.The head 25 of feeding valve 23 is pushed by this pressured fluid, and feeding valve 23 action, control mouthfuls 19 are communicated with feeding mouth 20.So the pressure that drives the 2nd liquid chamber 10 of cylinder pressure 6 raises, driven plunger 7 actions, movable electrode 3 carries out closed circuit action.At this moment, feeding valve portion 23 and head 25, sealing 33 action integratedly.In addition, after 23 releases of feeding valve, because the pressure balance of front and back so move under the spring force effect, is closed feeding mouth 20 and 19 in control mouth.
In the above-mentioned existing apply device,, the sealed department 44,45 of feeding mouth 20 sides and liquid port 22 sides must be located in a valve casing 46 on the same axle, valve casing 46 is needed very accurate processing in main operation valve portion 12.Therefore, cost height, manufacturing expenses time.In addition, the working solution scale of construction of the spring housing 29 at liquid discharging valve 24 backs of coming in and going out must be many, so the working solution scale of construction of the required consumption of on-off action is big, responsiveness is poor.
In addition,, drive switching valve 37 o'clock, send into the time of solenoid,, can not mechanically change, regulate by supplying with solenoidal electric condition decision to switching valve 37 actions from instruction with solenoid 40,41 in pilot valve portion 13.Therefore, in the time that actuation time will be changed, must change solenoid.
Summary of the invention
The present invention makes in view of the above problems, its purpose be to provide a kind of simple structure, action stable, regulate actuation time easily, cost is low, reliability is high apply device.
To achieve these goals, the present invention realizes by following technological scheme.Apply device of the present invention, have the liquid-storage container that stores highly pressurised liquid, drive portion by the working fluid action of supplying with from this liquid-storage container, control above-mentioned working fluid and control the hydraulic operation portion that above-mentioned drive portion moves, above-mentioned hydraulic operation portion has main operation valve portion and as the pilot valve portion of switching valve, main operation valve portion selectively supplies with above-mentioned working fluid or discharges above-mentioned drive portion, pilot valve portion is driven by electromagnetic coil, and the hydraulic pressure of the above-mentioned main operation valve of output controlling and driving, it is characterized in that above-mentioned main operation valve portion is provided with: cylindric liquid discharging valve, the liquid discharging valve spring, guide portion, the feeding valve, feeding valve spring, lid;
Above-mentioned cylindric liquid discharging valve, inner peripheral surface along this valve casing in cylindric valve casing slides, by be located at hermetic unit in this valve casing from the working fluid of discharging above-mentioned drive portion, by joining, and stop to discharge the working fluid of above-mentioned drive portion with the sealed department that is located in this valve casing;
Above-mentioned liquid discharging valve spring, with above-mentioned liquid discharging valve towards the direction pushing of joining with above-mentioned sealed department;
Above-mentioned guide portion is bearing in the liquid discharging valve valve casing inner peripheral surface with the opening portion of sealed department opposition side slidably;
Above-mentioned feeding valve, in liquid discharging valve, slide along this liquid discharging valve inner peripheral surface, by be located in this liquid discharging valve hermetic unit from, and working fluid is supplied with above-mentioned drive portion, by joining, and stop working fluid being supplied with above-mentioned drive portion with the sealed department that is located in this liquid discharging valve;
Above-mentioned feeding valve spring, with the feeding valve towards the direction pushing of joining with above-mentioned sealed department;
Above-mentioned lid is used to clog the sealed part side opening portion of liquid discharging valve valve casing.
According to the present invention, the sealed department of liquid discharging valve is located in the valve casing, the sealed department of feeding valve is located at liquid discharging valve inside, like this, needn't in valve casing, 2 sealed departments be located on the same axle, needn't implement the processing of difficulty like this, can reduce cost, shorten production time.
In apply device of the present invention, the basal area of the liquid chamber that above-mentioned liquid discharging valve and above-mentioned guide portion form, the annulus portion area that forms than the sealed diameter by the sealed department of the diameter of above-mentioned liquid discharging valve and valve casing slide part and above-mentioned valve casing and liquid discharging valve is big.
According to the present invention, the action of liquid discharging valve is that the hydraulic pressure by the liquid chamber that is formed by liquid discharging valve and guide portion carries out conscientiously, so, can make action stable.
In apply device of the present invention, the end with the sealed part side of above-mentioned feeding valve and above-mentioned liquid discharging valve forms round bar shape, and above-mentioned round bar shape end is run through the lid of liquid discharging valve slidably.
According to the present invention, after the feeding valve is opened, also can continue to stay open state by hydraulic pressure, so, when opening liquid discharging valve thereafter, can be provided with the feeding valve close before between retard time.Like this, need not change formation greatly, changed actuation time.
In apply device of the present invention, the 1st end with the sealed part side of above-mentioned feeding valve and above-mentioned liquid discharging valve forms round bar shape, and above-mentioned the 1st end is run through the lid of liquid discharging valve slidably; In addition, the 2nd end with the sealed department opposition side of above-mentioned feeding valve and above-mentioned liquid discharging valve forms round bar shape, and above-mentioned the 2nd end is run through the guide portion of liquid discharging valve slidably.
According to the present invention, owing to the volume of the liquid chamber that can reduce to form by liquid discharging valve and guide portion, so, can reduce the working solution scale of construction that valve events consumes, improve responsiveness.
In apply device of the present invention, sealed part side opening portion at the valve casing of above-mentioned liquid discharging valve is provided with groove, covering of above-mentioned liquid discharging valve stepped part is set, to be divided into the ring of cutting apart of three parts at circumferencial direction at least, insert in the above-mentioned groove with the stepped part of above-mentioned lid with engaging, the feeding valve is configured between above-mentioned lid and the feeding valve with spring.
According to the present invention, can with simple operation lid be installed on the liquid discharging valve with parts less, at a low price, can reduce the cost, assembling is oversimplified.
Apply device of the present invention, have the liquid-storage container that stores highly pressurised liquid, by the drive portion of the working fluid action of supplying with from this liquid-storage container, control above-mentioned working fluid and control the hydraulic operation portion of above-mentioned drive portion action by output control hydraulic pressure, above-mentioned hydraulic operation portion has cylindric valve casing, switching valve and switching valve portion; Switching valve slides along above-mentioned valve casing inner peripheral surface, by be located in the valve casing hermetic unit from or join, select the flow direction of working fluid; Switching valve portion has the open circuit that above-mentioned switching valve is driven and uses and the closed circuit electromagnetic coil of using; It is characterized in that, above-mentioned electromagnetic coil, but drive above-mentioned switching valve by its moving plate pushing, be located on the same axle with above-mentioned switching valve, but above-mentioned moving plate is pushed towards the direction of leaving above-mentioned switching valve by spring, in addition, but between the moving plate and switching valve of non-excited state, be provided with the gap, in order to change the size in this gap, in the end of electromagnetic coil, be provided with adjustable block, but this block is used for moving plate location positioning with non-excited state in the driving direction arbitrary position.
According to the present invention, the preceding distance but the moving plate by changing electromagnetic coil and switching valve join, but the kinergety can change moving plate and switching valve and join the time.Like this, the actuation time of switching valve can be changed, optimal actuation time can be easily obtained.
In apply device of the present invention, setting has the guide member of the through hole of adjustable position on axle, with the block that can slide in the hole of above-mentioned guide member, but above-mentioned block is provided with the stepped part of joining with guide member for the position of the moving plate that determines non-excited state on this block.
According to the present invention, because block can slide,, just can manually make the switching valve action so promote block in guide member, can carry out manually-operable simply.
Apply device of the present invention, have the liquid-storage container that stores highly pressurised liquid, by the drive portion of the working fluid action of supplying with from this liquid-storage container, control above-mentioned working fluid and control the hydraulic operation portion of above-mentioned drive portion action by output control hydraulic pressure, above-mentioned hydraulic operation portion has cylindric valve casing, switching valve and switching valve portion; Switching valve slides along above-mentioned valve casing inner peripheral surface, by be located in the valve casing hermetic unit from or join, select the flow direction of working fluid; Switching valve portion has the open circuit that above-mentioned switching valve is driven and uses and the closed circuit electromagnetic coil of using; It is characterized in that, but between the moving plate of above-mentioned switching valve and above-mentioned electromagnetic coil, the configuration spring, end at above-mentioned switching valve, setting has the spring guide portion of predetermined length, but between above-mentioned moving plate and above-mentioned spring, the bearing that configuration keeps spring to use is provided with the spring guide portion with predetermined length on above-mentioned bearing.
According to the present invention, when action, but push switching valve again behind the moving plate elder generation pressure spring.Like this,, make the switching valve action with energy and the solenoidal excitation power that spring is accumulated, so, can obtain stable action, by the distance of change pressure spring or the intensity of spring, changed actuation time.
Description of drawings
Describe embodiments of the invention in detail below in conjunction with accompanying drawing.
Fig. 1 is the sectional view of the present invention the 1st embodiment's apply device.
Fig. 2 is the sectional view of the main operation valve portion of apply device shown in Figure 1.
Fig. 3 is the main operation valve portion sectional view of the present invention the 2nd embodiment's apply device.
Fig. 4 is the main operation valve portion sectional view of the present invention the 3rd embodiment's apply device.
Fig. 5 is figure main operation valve portion, that see from axle direction of the present invention the 4th embodiment's apply device, (A) is the figure of cutting apart before ring inserts, and (B) is the figure of cutting apart after ring inserts.
Fig. 6 is the pilot valve portion sectional view of the present invention the 5th embodiment's apply device.
Fig. 7 is the pilot valve portion sectional view of the present invention the 6th embodiment's apply device.
Fig. 8 is the pilot valve portion sectional view of the present invention the 7th embodiment's apply device.
Fig. 9 is the sectional view of existing apply device.
Embodiment
Fig. 1 is the sectional view of the present invention the 1st embodiment's apply device.Fig. 2 is the sectional view of the main operation valve portion of apply device shown in Figure 1, with part identical in the conventional example shown in Figure 9, annotates with same tag, and its explanation is omitted.
As shown in Figure 1, in the apply device of present embodiment, hydraulic control portion 61 is made of main operation valve portion 62 and pilot valve portion 63, and main operation valve portion 62 has control mouth 64, feeding mouth 65 and liquid port 67.Control mouthful 64 pairs of the 2nd liquid chambers 10 are supplied with and the head pressure fluid selectively.The high pressure liquid that feeding mouth 65 is supplied with from liquid-storage container 15.Liquid port 67 is communicated with trough of low pressure 17 by low pressure stream 21.In addition, also be provided with the feeding valve 51 that is used for 65 in open and close controlling mouth 64 and feeding mouth and be used for open and close controlling mouth 64 and liquid port 67 between cylindric liquid discharging valve 52.Liquid discharging valve 52 can slide in valve casing 53, by be located on the valve casing 53 hermetic unit from or join, between open and close controlling mouth 64 and the liquid port 67.Feeding valve 51 can slide in liquid discharging valve 52, by be located at liquid discharging valve 52 in sealed department 55 separate or join, between open and close controlling mouth 64 and the feeding mouth 65.
In addition, liquid discharging valve 52 is provided with guide portion 56, and this guide portion 56 can slide at the opening portion inner peripheral surface with sealed department 54 opposition sides of valve casing 53 sealing, and the liquid chamber 57 by liquid discharging valve 52 and guide portion 56 form is communicated with the operation control mouth 68 of pilot valve portion 63.Be provided with at the opposing party's opening portion of liquid discharging valve 52 and cover 58, this lid 58 clogs opening portion, as the partition wall of control mouthfuls 64 with liquid port 67.
Be provided with feeding valve spring 59 on feeding valve 51, this spring 59 pushes feeding valve 51 towards closing direction.Be provided with liquid discharging valve spring 60 on liquid discharging valve 52, this spring 60 pushes liquid discharging valve 52 towards closing direction.
The following describes the action of this apply device of this structure.
In the action of the open circuit of main operation valve portion 62, according to the open circuit of pilot valve portion 63 command signal with solenoid 66, the switching valve 69 of pilot valve portion 63 carries out switch motion.Therefore, during closed circuit state the pressure fluid of the liquid chamber 57 of high pressure, discharge from operation control mouthful 68 process pilot valve portions 63, operation liquid port 70, liquid port 67, so the pressure of liquid chamber 57 reduces.Like this, with pressure official post liquid discharging valve 52 actions of the control mouth 164 of high pressure, control mouthfuls 64 is communicated with liquid port 67, so, driving the pressure reduction of the 2nd liquid chamber 10 of cylinder pressure 6, driven plunger 7 is moved, movable electrode 3 action of opening a way.In addition, after liquid discharging valve 52 releases,, close between liquid port 67 and the control mouth 64 because the pressure balance of front and back is moved by the power of liquid discharging valve with spring 60.Like this, when the closed circuit action of next time, do not produce action and postpone.
In closed circuit action, according to the closed circuit command signal with solenoid 71 of pilot valve portion 63, the switching valve 69 of pilot valve portion 63 carries out switch motion.Therefore, pressured fluid is controlled mouth 68 from feeding mouth 65 through operation feeding mouth 72, pilot valve portion 63, operation, the liquid chamber 57 of low pressure when supplying to open-circuit condition, and the pressure of liquid chamber 57 rises.Like this, make 51 actions of feeding valve with the pressure difference of the control mouth 64 of low pressure, control mouthfuls 64 is communicated with feeding mouth 65, so, driving the pressure rising of the 2nd liquid chamber 10 of cylinder pressure 6, driven plunger 7 is moved, and movable electrode 3 carries out closed circuit action.In addition, after 51 releases of feeding valve,, will close between feeding mouth 65 and the control mouth 64 because the pressure balance of front and back is moved by the power of feeding valve with spring 59.Like this, when open circuit action next time, do not produce delay.In addition, at this moment, because control mouth 64 becomes high pressure, so generation will be opened the power of liquid discharging valve 52, be failure to actuate in order to make liquid discharging valve 52, each size will satisfy following relation.That is, the diameter of establishing liquid chamber 57 be the periphery slide part diameter of d1, liquid discharging valve 52 be d2, liquid discharging valve 52 with the diameter of the sealed department 54 of valve casing 53 be d3, liquid discharging valve with the pushing force of spring 60 be f1, when hydraulic pressure is p1,
(d1
2×π×p1/4)+f1＞(d2
2-d3
2)×π×P1/4
According to this relation, even control mouth 64 becomes high pressure, liquid discharging valve 52 also is failure to actuate, and control mouth 64 keeps closed condition with liquid port 67.
According to present embodiment, the sealed department 54 of liquid discharging valve 52 is located in the valve casing 53, the sealed department 55 of feeding valve 51 is located at the inside of liquid discharging valve 52, like this, in valve casing 53, will not be located on the same axle by 2 sealed departments, do not need the processing of difficulty, can reduce cost, manufacturing time also shortens.
As the present invention the 1st embodiment's variation, each size of liquid discharging valve 52 satisfies the following formula relation.Promptly
(d1
2×π×p1/4)＞(d2
2-d3
2)×π×P1/4
According to this relation, also irrelevant with the pushing force of spring 60 even control mouth 64 becomes high pressure with liquid discharging valve, can only prevent the misoperation of liquid discharging valve 52 with the hydraulic pressure of high pressure liquid.
According to this variation, because each size is as above set, the action of liquid discharging valve 52 is undertaken by the hydraulic pressure of the liquid chamber 57 that is formed by liquid discharging valve 52 and guide portion 56, and action is stablized, and can obtain the high apply device of reliability.
Fig. 3 is the sectional view of the present invention the 2nd embodiment's main operation valve portion.
As shown in the figure, in the present embodiment,, be provided with the slide part 73 of round bar shape in the end of the feeding valve 51 of main operation valve portion 62.Present embodiment and the 1st embodiment's difference is that this slide part 73 runs through the lid 58 of liquid discharging valve 52 slidably.Other structure is identical, and the identical portions dispensing is with same tag, and its repeat specification is omitted.
In the present embodiment, the closed circuit action of main operation valve portion 62, basic identical with the 1st embodiment, but following different.That is, after the closed circuit release, even the front and back hydraulic pressure of feeding valve 51 becomes high pressure, because only the basal area part of round bar shape slide part 73 is big towards the power of the directive effect of opening feeding valve 51, so, feeding valve 51 does not move, and feeding mouth 65 is keeping open mode with control mouth 64.In the open circuit action, even the pressure of liquid chamber 57 reduces, liquid discharging valve 52 is opened, but before feeding valve 51 cut out, the pressure of the 2nd liquid chamber 10 of drive portion 5 did not reduce, so, can make the action of driven plunger 7 produce delay.This opens circuit when waiting action that postpones movable electrode 3 with 3 circulations for hope is effective.By such structure, can change structure greatly, can change the actuation time of open circuit.
Fig. 4 is the sectional view of the present invention the 3rd embodiment's main operation valve portion.
As shown in the figure, in the present embodiment, be except the slide part 73 (the 1st slide part 73) of the 2nd embodiment's feeding valve 51 ends, also to be provided with round bar shape the 2nd slide part 74 in the other end of feeding valve 51 with the 2nd embodiment's difference.Other structure is identical, and identical part is annotated with same tag, and its repeat specification is omitted.
The 2nd slide part 74 of present embodiment slidably runs through the guide portion 56 of liquid discharging valve 52, so, can reduce the volume of the liquid chamber 57 that forms by liquid discharging valve 52 and guide portion 56, like this, the consumption of the working liquid body in the time of can reducing valve events can improve the responsiveness of each valve.In addition, the relation of the diameter of the diameter of the 2nd slide part 74 and the 1st slide part 73, when the diameter of the 1st slide part 73 during greater than the diameter of the 2nd slide part 74, with the 2nd embodiment similarly, after closed circuit action, feeding valve 51 keeps opening state, in the action of next one open circuit, can make the action of driven plunger 7 produce delay.Otherwise, when the diameter of the 1st slide part 73 during less than the diameter of the 2nd slide part 74, after the closed circuit action, because feeding valve 51 cuts out, so, in the action of next one open circuit, do not produce action and postpone.The diameter Relationship of the 1st slide part 73 and the 2nd slide part 74 as mentioned above, can suitably be selected according to purposes.
Fig. 5 is from the axle direction of the present invention the 4th embodiment's main operation valve portion, is the figure that the directions X of Fig. 2 is seen.
As Fig. 2 and shown in Figure 5, in the present embodiment, the opening portion in liquid port 67 sides of liquid discharging valve 52 is provided with groove 75, is provided with stepped part 76 on lid 58.Engage and be divided at least the ring 77 more than 3 with this stepped part 76, be inserted in the groove 75 of opening portion of liquid discharging valve 52.In addition, between lid 58 and feeding valve 51, disposing feeding valve spring 59.
Because present embodiment such as above-mentioned constitute is so when being contained in lid 58 on the liquid discharging valve 52, lid 58 is pushed towards the direction of extracting from liquid discharging valve 52 with spring 59 by the feeding valve.That is, stop and to cover 58 and extract from liquid discharging valve 52 by encircling 77.At this moment, ring 77 is partitioned into more than three shown in Fig. 5 (A), so, shown in figure (B),, can stop lid from liquid discharging valve 52, to be extracted one that cuts apart ring last the insertion.Like this, needn't adopt special instrument, just can easily lid 58 be contained on the liquid discharging valve 52.In addition, when adopting back-up ring etc., the axle power that hydraulic pressure produces may be cannot stand, enough intensity can be obtained but adopt to encircle.Therefore, utilize price is low, quantity is few parts and simple operation, lid can be installed on the liquid discharging valve, also can obtain enough intensity, reduce cost, assembling is oversimplified.
Fig. 6 is the sectional view of the present invention the 5th embodiment's pilot valve portion.
As Fig. 1 and shown in Figure 6, in the present embodiment, hydraulic control portion 61 constitutes by main operation valve portion 62 with as the pilot valve portion 63 of switching valve.Pilot valve portion 63 has operation control mouth 68, operation feeding mouth 72, operation liquid port 70.The liquid chamber 57 at the back of operation control mouthful 68 pairs of liquid discharging valves 52 selectively carries out the supply and the discharge of pressure fluid.The high pressure liquid that operation feeding mouth 72 is supplied with from liquid-storage container 15.Operation liquid port 70 is communicated with trough of low pressure 17 by low pressure stream 21.In addition, also be provided with and be used between opening and closing operations control mouthfuls 68 and the operation feeding mouth 72 or operation control mouthfuls 68 and operate switching valve 69 between the liquid port 70.This switching valve 69 is slided by valve body 78,79 guidings, and switching valve 69 joins with the bight of valve body 78,79, and the switching of carrying out between each mouthful is switched.
Be adjacent to be provided with open circuit solenoid 66 and closed circuit with switching valve 69 with solenoid 71, when solenoid is accepted action command by excitation, but each moving plate 80 action, switching valve 69 just moves.In addition, but on each moving plate 80, but the spring 81 that moving plate 80 is pushed away towards non-excitation direction be provided with.Be provided with block 82 in solenoidal end, but this block 82 is used to determine the position of the moving plate 80 of non-excited state, the at random position of fixed stop 82.Among Fig. 6, on block 82, be provided with screw thread, use the nut fixed position.
In the present embodiment of this structure, but owing to moving plate 80 is pushed by spring 81, so at non-excited state, but produce the gap between moving plate 80 and the switching valve 69, and this gap can be adjusted to any size with block 82.When moving according to command signal, but the size in this gap is the idling stopping distance of moving plate 80, but the size of the size in gap decision moving plate kinergety, but the size of the collision energy when decision moving plate 80 joins with switching valve 69.Therefore, but, can change the energy that makes switching valve 69 actions, can easily change actuation time, easily obtain optimal actuation time with the gap of block 82 adjusting moving plates 80 with switching valve 69.
The invention is not restricted to the various embodiments described above, for example, in driving the smaller hydraulic pressure installation of energy, in hydraulic control portion main operation valve portion is not set sometimes,, in this case, also can adopt the present invention with direct controlling and driving portion of switching valve portion.In addition, only have the open circuit with or closed circuit usefulness in a side time, also can adopt the present invention.
Fig. 7 is the sectional view of the present invention the 6th embodiment's pilot valve portion.
As shown in the figure, in the present embodiment, with the 5th embodiment's block such as following constitute.That is, in the solenoid end block guide member 84 that can be fixed on the arbitrary position is set, this block guide member 84 has through hole, in the hole of block guide member 84, is provided with slidably backing pin 86, and this backing pin 86 has the stepped part 85 that engages with block guide member 84.Among the figure, on block guide member 84, be provided with the screw section, with nut 87 fixed positions.
According to the present embodiment of this structure,, just can make switching valve 69 actions as long as pushing backing pin 86 is used such simple manual operation.
Fig. 8 is the sectional view of the present invention the 7th embodiment's pilot valve portion.
As shown in the figure, in the present embodiment, be in the 6th embodiment, with pilot valve portion 63 as constitute followingly.That is, in pilot valve portion 63, be provided with switching valve 69, this switching valve 69 be used for between operation control mouthfuls 68 and the operation feeding mouth 72 or operation control mouthfuls 68 with operate switching between the liquid port 70.This switching valve 69 is guided by valve body 78,79 and is slided, and, to join by the bight of switching valve 69 with valve body 78,79, the switching of carrying out between each mouthful is switched.
Be adjacent to be provided with open circuit solenoid 66 and closed circuit with switching valve 69 with solenoid 71, when solenoid is accepted action command by excitation, but each moving plate 80a, 80b action, switching valve 69 just moves.In addition, but switching valve 69 and open circuit are disposing spring 88 with between the moving plate 80a of solenoid 68, in the end of switching valve 69, the spring guide portion 69a with predetermined length are set.In addition, but between moving plate 80a and spring 88, disposing the bearing 89 that is used to keep spring 88.Spring guide portion 90 with predetermined length is set on bearing 89.
According to the present embodiment of this structure, during action, but behind the moving plate 80a elder generation pressure spring 88, push switching valve 69 again.Therefore, energy and the excitation power of open circuit with solenoid 66 with spring 88 is accumulated make switching valve 69 actions.So, can obtain stable action, by distance that changes pressure spring or the intensity that changes spring, can easily change actuation time.
In addition, the invention is not restricted to embodiment, also applicable to closed circuit usefulness, perhaps be applicable to open circuit, closed circuit the two.
As mentioned above, according to the present invention, will 2 sealed member be arranged on the same axle in the valve casing of main operation valve portion, so needn't carry out the processing of difficulty like this, can reduce cost, manufacturing time also shortens.
According to the present invention, the action of liquid discharging valve is that the hydraulic pressure by the liquid chamber that is formed by liquid discharging valve and guide portion carries out conscientiously, so, can make action stable.
According to the present invention, after the feeding valve is opened, also can continue to stay open state by hydraulic pressure, so, when opening liquid discharging valve thereafter, can be set to the feeding valve close before between retard time.Like this, need not change formation greatly, changed actuation time.
According to the present invention, owing to the volume of the liquid chamber that can reduce to form by liquid discharging valve and guide portion, so, can reduce the working solution scale of construction that valve events consumes, improve responsiveness.
According to the present invention, can with simple operation lid be installed on the liquid discharging valve with parts less, at a low price, can reduce the cost, assembling is oversimplified.
According to the present invention, the preceding distance but the moving plate by changing electromagnetic coil and switching valve join, but the kinergety can change moving plate and switching valve and join the time.Like this, the actuation time of switching valve can be changed, optimal actuation time can be easily obtained.
According to the present invention, because block can slide,, just can manually make the switching valve action so promote block in guide member, can carry out manually-operable simply.
According to the present invention, when action, but push switching valve again behind the moving plate elder generation pressure spring.Like this,, make the switching valve action with energy and the solenoidal excitation power that spring is accumulated, so, can obtain stable action, by the distance of change pressure spring or the intensity of spring, changed actuation time.
Claims (8)
1, apply device, have the liquid-storage container that stores highly pressurised liquid, drive portion by the working fluid action of supplying with from this liquid-storage container, control above-mentioned working fluid and control the hydraulic operation portion that above-mentioned drive portion moves, above-mentioned hydraulic operation portion has main operation valve portion and as the pilot valve portion of switching valve, main operation valve portion supplies with above-mentioned working fluid or discharges above-mentioned drive portion selectively, pilot valve portion is driven by electromagnetic coil, and the hydraulic pressure of the above-mentioned main operation valve of output controlling and driving, it is characterized in that
Above-mentioned main operation valve portion is provided with: cylindric liquid discharging valve, liquid discharging valve with spring, guide portion, feeding valve, feeding valve with spring, lid;
Above-mentioned cylindric liquid discharging valve, in cylindric valve casing, slide along the inner peripheral surface of this valve casing, by be located in this valve casing hermetic unit from, and discharge the working fluid of above-mentioned drive portion, by joining, and stop to discharge the working fluid of above-mentioned drive portion with the sealed department that is located in this valve casing;
Above-mentioned liquid discharging valve spring, with above-mentioned liquid discharging valve towards the direction pushing of joining with above-mentioned sealed department;
Above-mentioned guide portion is bearing in the liquid discharging valve valve casing inner peripheral surface with sealed department opposition side opening portion slidably;
Above-mentioned feeding valve, in liquid discharging valve, slide along this liquid discharging valve inner peripheral surface, by be located in this liquid discharging valve hermetic unit from, and working fluid is supplied with above-mentioned drive portion, by joining, and stop working fluid being supplied with above-mentioned drive portion with the sealed department that is located in this liquid discharging valve;
Above-mentioned feeding valve spring, with the feeding valve towards the direction pushing of joining with above-mentioned sealed department;
Above-mentioned lid is used to clog the sealed part side opening portion of liquid discharging valve valve casing.
2. apply device as claimed in claim 1, it is characterized in that, the basal area of the liquid chamber that above-mentioned liquid discharging valve and above-mentioned guide portion form, than by the diameter of above-mentioned liquid discharging valve and valve casing slide part, and the area of the annulus portion that forms of the sealed diameter of the sealed department of above-mentioned valve casing and liquid discharging valve big.
3. apply device as claimed in claim 1 is characterized in that, the end with the sealed part side of above-mentioned feeding valve and above-mentioned liquid discharging valve forms round bar shape, and above-mentioned round bar shape end is run through the lid of liquid discharging valve slidably.
4. apply device as claimed in claim 1 is characterized in that, the 1st end with the sealed part side of above-mentioned feeding valve and above-mentioned liquid discharging valve forms round bar shape, and above-mentioned the 1st end is run through the lid of liquid discharging valve slidably; In addition, the 2nd end with the sealed department opposition side of above-mentioned and feeding valve and above-mentioned liquid discharging valve forms round bar shape, and above-mentioned the 2nd end is run through the guide portion of liquid discharging valve slidably.
5. as each described apply device in the claim 1 to 4, it is characterized in that, sealed part side opening portion at the valve casing of above-mentioned liquid discharging valve is provided with groove, covering of above-mentioned liquid discharging valve stepped part is set, to be divided into the ring of cutting apart of three parts at circumferencial direction at least, insert in the above-mentioned groove with the stepped part of above-mentioned lid with engaging, the feeding valve is configured between above-mentioned lid and the feeding valve with spring.
6. apply device, have the liquid-storage container that stores highly pressurised liquid, by the drive portion of the working fluid action of supplying with from this liquid-storage container, by the output control above-mentioned working fluid of hydraulic control and control the hydraulic operation portion of above-mentioned drive portion action, above-mentioned hydraulic operation portion has cylindric valve casing, switching valve and switching valve portion; Switching valve slides along above-mentioned valve casing inner peripheral surface, by be located in the valve casing hermetic unit from or join, select the flow direction of working fluid; Switching valve portion has the open circuit that above-mentioned switching valve is driven and uses and the closed circuit electromagnetic coil of using; It is characterized in that,
Above-mentioned electromagnetic coil, be located on the same axle with above-mentioned switching valve, but pushing drives above-mentioned switching valve by its moving plate, but above-mentioned moving plate by spring towards the direction pushing of leaving above-mentioned switching valve, in addition, but between the moving plate and switching valve of non-excited state, be provided with the gap,, be provided with adjustable block in the end of electromagnetic coil, but this block is used for moving plate location positioning with non-excited state in the arbitrary position of driving direction, to change the size in this gap.
7. apply device as claimed in claim 6, it is characterized in that, setting has the guide member of the through hole of adjustable position on axle, with the block that can in the hole of above-mentioned guide member, slide, but above-mentioned block is provided with the stepped part of joining with guide member for the position of the moving plate that determines non-excited state on this block.
8. apply device, have the liquid-storage container that stores highly pressurised liquid, by the drive portion of the working fluid action of supplying with from this liquid-storage container, control above-mentioned working fluid and control the hydraulic operation portion of above-mentioned drive portion action by output control hydraulic pressure, above-mentioned hydraulic operation portion has cylindric valve casing, switching valve and switching valve portion; Switching valve slides along above-mentioned valve casing inner peripheral surface, by be located in the valve casing hermetic unit from or join, select the flow direction of working fluid; Switching valve portion has the open circuit that above-mentioned switching valve is driven and uses and the closed circuit electromagnetic coil of using; It is characterized in that,
But between the moving plate of above-mentioned switching valve and above-mentioned electromagnetic coil, the configuration spring, end at above-mentioned switching valve, setting has the spring guide portion of predetermined length, but between above-mentioned moving plate and above-mentioned spring, the bearing that configuration keeps spring to use is provided with the spring guide portion with predetermined length on above-mentioned bearing.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000162879A JP4322399B2 (en) | 2000-05-31 | 2000-05-31 | Hydraulic operation device |
| JP162879/2000 | 2000-05-31 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1326054A CN1326054A (en) | 2001-12-12 |
| CN1299014C true CN1299014C (en) | 2007-02-07 |
Family
ID=18666723
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB01118518XA Expired - Lifetime CN1299014C (en) | 2000-05-31 | 2001-05-29 | Hydraulic activator |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP4322399B2 (en) |
| KR (1) | KR100389445B1 (en) |
| CN (1) | CN1299014C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112503043A (en) * | 2020-03-20 | 2021-03-16 | 平高集团有限公司 | Hydraulic operating mechanism and hydraulic control valve |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009015881A1 (en) * | 2009-04-01 | 2010-10-07 | Abb Technology Ag | Hydromechanical drive for electrical line switches |
| CN101916676B (en) * | 2010-08-16 | 2012-07-04 | 杨秀丽 | Electromagnetic hydraulic valve for spring hydraulic control mechanism |
| US9115728B2 (en) * | 2010-08-23 | 2015-08-25 | Kosmek Ltd. | Directional control valve device |
| KR101208639B1 (en) | 2012-06-21 | 2012-12-07 | 강용주 | Solenoid pump |
| CN103244497A (en) * | 2013-05-13 | 2013-08-14 | 深圳市瑞格尔仪器有限公司 | Ultrahigh pressure hydraulic servo valve core, servo valve, one-way loading system and two-way loading system |
| JP6320193B2 (en) * | 2014-06-20 | 2018-05-09 | 株式会社東芝 | Hydraulic operation device |
| JP6470159B2 (en) * | 2015-09-30 | 2019-02-13 | 株式会社東芝 | Hydraulic operating device and inspection method thereof |
| CN105351275A (en) * | 2015-11-06 | 2016-02-24 | 河南平芝高压开关有限公司 | Integrated valve and circuit breaker hydraulic operating mechanism with integrated valve |
| CN105719856B (en) * | 2015-12-15 | 2017-12-01 | 中国西电电气股份有限公司 | A kind of hydraulic pressure spring operating mechanism pressure release control system and method |
| CN106952754B (en) * | 2017-04-18 | 2019-05-28 | 中国西电电气股份有限公司 | Energy charging device for breaker hydraulic actuating mechanism |
| CN107859663A (en) * | 2017-10-25 | 2018-03-30 | 成都弗格森液压机电有限公司 | The restraining device of redundant force in a kind of servo hydraulic system |
| CN111477477B (en) * | 2020-04-13 | 2022-04-26 | 李贵伦 | Stroke block collision converter |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5353594A (en) * | 1992-05-29 | 1994-10-11 | Mitsubishi Denki Kabushiki Kaisha | Driving mechanism of a circuit breaker |
| US5502290A (en) * | 1990-09-17 | 1996-03-26 | Hitachi, Ltd. | Switch mechanism |
| US5750950A (en) * | 1995-09-20 | 1998-05-12 | Hitachi, Ltd. | Hydraulic drive device for circuit breaker and circuit breaker using the same |
| US5804787A (en) * | 1995-11-20 | 1998-09-08 | Hitachi, Ltd. | Gas circuit breaker and liquid pressure-driving system to be used therefor |
| CN1235363A (en) * | 1998-02-25 | 1999-11-17 | 东芝株式会社 | Hydraulic operating device |
| CN1238542A (en) * | 1998-06-09 | 1999-12-15 | 东芝株式会社 | Hydraulic operation device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57122643U (en) * | 1981-01-23 | 1982-07-30 | ||
| JPH1196859A (en) * | 1997-09-18 | 1999-04-09 | Hitachi Ltd | Fluid pressure driving device for breaker |
| JP3473437B2 (en) * | 1998-09-17 | 2003-12-02 | 株式会社日立製作所 | Circuit breaker fluid pressure drive |
-
2000
- 2000-05-31 JP JP2000162879A patent/JP4322399B2/en not_active Expired - Lifetime
-
2001
- 2001-05-28 KR KR10-2001-0029453A patent/KR100389445B1/en not_active IP Right Cessation
- 2001-05-29 CN CNB01118518XA patent/CN1299014C/en not_active Expired - Lifetime
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5502290A (en) * | 1990-09-17 | 1996-03-26 | Hitachi, Ltd. | Switch mechanism |
| US5353594A (en) * | 1992-05-29 | 1994-10-11 | Mitsubishi Denki Kabushiki Kaisha | Driving mechanism of a circuit breaker |
| US5750950A (en) * | 1995-09-20 | 1998-05-12 | Hitachi, Ltd. | Hydraulic drive device for circuit breaker and circuit breaker using the same |
| US5804787A (en) * | 1995-11-20 | 1998-09-08 | Hitachi, Ltd. | Gas circuit breaker and liquid pressure-driving system to be used therefor |
| CN1235363A (en) * | 1998-02-25 | 1999-11-17 | 东芝株式会社 | Hydraulic operating device |
| CN1238542A (en) * | 1998-06-09 | 1999-12-15 | 东芝株式会社 | Hydraulic operation device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112503043A (en) * | 2020-03-20 | 2021-03-16 | 平高集团有限公司 | Hydraulic operating mechanism and hydraulic control valve |
| CN112503043B (en) * | 2020-03-20 | 2021-11-16 | 平高集团有限公司 | Hydraulic operating mechanism and hydraulic control valve |
Also Published As
| Publication number | Publication date |
|---|---|
| KR100389445B1 (en) | 2003-06-27 |
| JP2001345032A (en) | 2001-12-14 |
| JP4322399B2 (en) | 2009-08-26 |
| CN1326054A (en) | 2001-12-12 |
| KR20010109126A (en) | 2001-12-08 |
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