CN100494697C - Self-capacitance electrohydraulic executor - Google Patents
Self-capacitance electrohydraulic executor Download PDFInfo
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- CN100494697C CN100494697C CNB2007101260909A CN200710126090A CN100494697C CN 100494697 C CN100494697 C CN 100494697C CN B2007101260909 A CNB2007101260909 A CN B2007101260909A CN 200710126090 A CN200710126090 A CN 200710126090A CN 100494697 C CN100494697 C CN 100494697C
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Abstract
This invention provides a self-contained electro-hydraulic performer for steam turbine controlling system. It includes oil sources block, accumulator, controlling oil sources block, fluid cylinder and administer. The oil sources block, controlling oil sources block, fluid cylinder and administer integrate together for a self-contained electro-hydraulic performer. In this performer, the oil passage is contained in oil sources block and controlling oil sources block without external oil passage. Because of integrated structure of this invention, it can be installed in the control valve while using it. Connect with the power cord and the signal cord, the assignment can be completed. The main characteristic of the invention is integrated structure. Energy-saving, environmentally friendly, system simplified, structure simplified, Convenient, Lower costs and higher reliability appear because of this integrated structure. It can be used for taking place of large steam turbine large high-pressure steam-fuel electro-hydraulic servo system and used for large low-pressure steam turbine oil-turbine electro-hydraulic servo system.
Description
Technical field
The present invention relates to a kind of electrohydraulic control of automation field, specifically, relate to a kind of self-capacitance electrohydraulic actuator that is used for steam turbine control system.
Background technique
Existing electrohydraulic steam turbine controlling system is made up of electronic controller, electro-hydraulic actuator and oil sources station, and required pressure oil is by concentrating the oil sources station that is provided with to provide by the oil outer pipeline.A common oil sources station is distributed frame by a plurality of electro-hydraulic actuator fuel feeding of external oil pipe road direction.Because a steam turbine needs many electro-hydraulic actuators, the pressure oil that required energy is provided by the oil sources station is concentrated and is supplied with, and therefore needs to interconnect by the complicated pipelines system.
The huge external oil pipe appearance of a street easily produces leakage, causes the system failure, and the fluid of leakage causes fire easily, so be working medium with the fire-resistant oil how.The environmental pollution that fire-resistant oil causes is with nuclear waste peer.
Existing electro-hydraulic actuator is made of parts such as oil hydraulic cylinder, electrohydraulic control or solenoid valve, quick closing valve solenoid valve and unloading valve, stroke sensor and manipulation seats, is working medium with the fire-resistant oil, is applicable to the control of large-size steam turbine modulating valve and main stop valve.
During operation, the electro-hydraulic actuator most of the time is operated in stable state, and fuel consumption is less, but regular consumption.Oil consumption is the work oil consumption in dynamic process, measures greatlyyer, but the time is very short, and therefore, average energy consumption is not high, only a little more than static fuel consumption.And the supply capability at oil sources station designs by maximum fuel delivery, and when normally moving, most of energy is to have consumed in the inner loop process of oil sources station.Energy consumption rises the oil temperature, need heat be taken away through oil cooler then, makes oil sources station structure complexity, and energy consumption increases.
Owing to use fire-resistant oil, need establish reclaimer, also make the oil sources station become huge.Huge oil sources station and oil outer pipeline make the construction cost costliness, and the operation maintenance workload is big, the expense height.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of self-capacitance electrohydraulic actuator that is used for steam turbine, eliminates environmental issue and high energy consumption problem that existing electrohydraulic control system exists, and a kind of function admirable is provided, and has the electro-hydraulic actuator of the feature of environmental protection and energy saving.
In order to solve the problems of the technologies described above, the invention provides a kind of self-capacitance electrohydraulic actuator, comprise oil hydraulic cylinder, the control oil channel piece reaches and the integrated oil sources piece of described control oil channel piece, described oil sources piece comprises fuel tank, motor and oil pump, described control oil channel piece comprises quantity control valve, unloading valve and quick closing valve solenoid valve, described quantity control valve oil outlet and described unloading valve filler opening are connected with described oil hydraulic cylinder control mouth respectively, described unloading valve oil outlet and described quick closing valve solenoid valve oil drain out are connected to described fuel tank respectively, it is characterized in that, described quick closing valve solenoid valve filler opening is connected with described oil sources piece, and described quick closing valve solenoid valve oil outlet is connected with unloading valve control mouth with described quantity control valve filler opening respectively.
Further, also comprise accumulator, one-way valve, described oil sources piece also comprises oil-filled solenoid valve, described one-way valve filler opening is connected with the oil pump oil outlet, described one-way valve oil outlet is connected with described accumulator filler opening, described accumulator oil outlet is an oil sources piece oil outlet, and described oil-filled solenoid valve filler opening is connected on the pipeline between oil pump oil outlet and the one-way valve filler opening, and described oil-filled solenoid valve oil outlet is connected with fuel tank.
Further, described control oil channel piece also comprises an oil feed non-return valve, described quick closing valve solenoid valve oil outlet is connected with unloading valve control mouth with the oil feed non-return valve filler opening respectively by an oil circuit point of branching, described oil feed non-return valve is installed between described oil circuit point of branching and the described quantity control valve filler opening, and described oil feed non-return valve oil outlet is connected with described quantity control valve filler opening.
Further, also comprise the stroke signal-transmitting machine, described stroke signal-transmitting machine is connected with spring seat moved end, oil hydraulic cylinder bottom, and described quantity control valve is an electrohydraulic control; Perhaps
Also comprise the position limit switch group, described position limit switch group is connected with spring seat moved end, oil hydraulic cylinder bottom, and described quantity control valve is a solenoid valve.
Further, this self-capacitance electrohydraulic actuator adopts antiwear hydraulic oil.
Further, reduce the static fuel consumption of electro-hydraulic actuator, the present invention has adopted following measure as far as possible:
1) oil hydraulic cylinder is selected for use and is leaked cylinder in zero.
2) electrohydraulic control is selected the DDV valve for use, and the static fuel consumption of this valve is zero.
3) hydraulic element such as solenoid valve, unloading valve, static fuel consumption also are zero.
4) design of oil system makes static fuel consumption be reduced to zero.
5) pressure oil enters servovalve through quick closing valve solenoid valve, one-way valve, and unloading valve control oil pressure is selected from the quick closing valve electromagnetic valve outlet, oil sources short circuit when having avoided the quick closing valve action.
Above measure can make the static fuel consumption of electro-hydraulic actuator be reduced to zero, for the energy-saving design of oil sources piece has been created condition.
Further,,, eliminated fire-resistant oil, had the feature of environmental protection the pollution that environment produces so the working medium of self-capacitance electrohydraulic actuator of the present invention does not adopt fire-resistant oil because the danger of fire has been avoided in integrated design.
Further,, make original huge oil sources station be reduced to small-sized oil sources piece, make the integrated possibility that is designed to owing to adopt energy-saving design and environmental protection design.
Further, owing to, can save the fire-resistant oil regenerative system, the oil sources piece is simplified without fire-resistant oil.
Further, the oil sources piece adopts the accumulator fuel feeding, and the pressure regulation oil consumption has been saved in the electrically switchable grating pressure regulation, and is further energy-conservation.
Further, because energy-saving design, the fluid temperature rise is very little, can save the oil cooler system, further simplifies the oil sources piece.
In a word, the present invention optimizes the structure of control oil channel piece simultaneously by the oil sources piece is integrated in the final controlling element, has realized high-performance, environmental protection, energy-conservation purpose of design.Eliminated existing electrohydraulic servo system waste oil sources, bulky, the defective that involves great expense, reached the saving energy, pollution abatement reduces cost and improves the effect of reliability, has characteristics simple in structure, easy to install and use simultaneously.
Description of drawings
Fig. 1 is the oil circuit schematic representation of first embodiment of the invention self-capacitance electrohydraulic actuator, is applicable to turbine governor valve control.
Fig. 2 is the oil circuit schematic representation of second embodiment of the invention self-capacitance electrohydraulic actuator, is applicable to Steam Turbine's Main Vaper Valve control.
Embodiment
Self-capacitance electrohydraulic actuator provided by the invention is integrated in the oil sources station on the electro-hydraulic actuator, forms an integral body, does not have the oil outer pipeline, thereby eliminates the defective of existing electrohydraulic servo system, reaches the purpose of energy saving, pollution abatement.For this reason, need to solve the decentralized and miniaturization issues in conventional oil sources station, the conventional oil sources station that is about to centralized oil supply is distributed to each electro-hydraulic actuator through miniaturization, makes it to be integrated on the electro-hydraulic actuator.Adopt energy-saving design and environmental protection design, for the miniaturization of oil sources station creates conditions.Simultaneously, self-capacitance electrohydraulic actuator has adopted high oil pressure design, makes it to have high position precision and high dynamic corresponding performance.
For this reason, the invention provides a kind of integrated form oil sources piece, this oil sources piece has following characteristics:
(1) by accumulator to the electro-hydraulic actuator continuous oil supply, supply capability is pressed electro-hydraulic actuator average consumprion design.Owing to adopted energy-saving design, the electro-hydraulic actuator average consumprion is very little, much smaller than existing conventional system.
(2) adopt high-pressure gear pump,, be interrupted oil-filled to accumulator through one-way valve.
(3) control oil-filled solenoid valve and oil pump motor by two pressure switches, constitute electrically switchable grating type pressure governor, the accumulator charge oil pressure is adjusted at the upper and lower limit scope, save the pressure regulation oil consumption.
(4) oil-filled process control is as follows:
Lower bound oil pressure pressure switch that charge oil pressure is low---〉action---〉actuating motor---〉time-delay 2 seconds---〉oil-filled solenoid valve is charged, begin oil-filled---〉charge oil pressure and be elevated to the high limit of high limit---〉oil pressure pressure switch action---〉oil-filled solenoid valve dead electricity, unloading---delaying time stopped motor in 2 seconds.
Oil pump only turns round in oil-filled process, all the other time stalls.
Motor start-up and stopped process all are unloaded, reduce rush of current, life-saving.
(5) adopt the antiwear hydraulic oil medium of working, temperature variation, the especially low-temperature characteristics that can adapt in a big way are good, can save heater.
(6) according to above-mentioned design, can cancel equipment and oil outer pipelines such as oil cooler, heater, reclaimer, the oil sources station is greatly simplified, realized decentralized and miniaturization, and reached energy-conservation and purpose environmental protection.
(7) integrated form oil sources piece is made up of parts such as fuel tank, motor-gear pump group, one-way valve, accumulator, oil-filled solenoid valve, pressure switches, gear pump and corresponding oil pipe line are integrated in fuel tank and control oil channel piece inside, motor is positioned at the fuel tank top, accumulator is installed in the fuel tank side, one-way valve, pressure switch etc. are integrated on the manifold block, are installed in the fuel tank another side.Whole oil sources piece of the present invention is small-sized, hangs over electro-hydraulic actuator next door, directly to the electro-hydraulic actuator fuel feeding, does not need the external oil pipe line just can proper functioning, simultaneously, has exempted the oil outer pipeline and has leaked the system failure and the fire peril of bringing.
(8) the oil sources piece is integrated on the electro-hydraulic actuator, forms an integral body.During application, only need final controlling element of the present invention is installed on the controlled valve, connect power supply and signaling line, just can independently carry out the electrichydraulic control function.
(9) the electro-hydraulic actuator control oil channel is no quiet consumption design; The oil-way system structure is optimized, and guarantees that the quick closing valve action is preferential, prevents the short circuit of quick closing valve process oil sources; Adopt the dynamic characteristic of high pressure design to guarantee that final controlling element has high position precision and responds fast; Servovalve does not have machinery zero partially, and oil hydraulic cylinder is protected the position automatically when guaranteeing dead electricity.
Simultaneously, the present invention optimizes the structure of oil-way system, to reach better control effect.
According to the demand of different controlling object, the present invention has formed Series Design.
Below in conjunction with accompanying drawing to a preferred embodiment of the present invention will be described in detail.
Embodiment one:
With reference to shown in Figure 1, be first embodiment of the invention, promptly be used for the oil circuit schematic representation of the self-capacitance electrohydraulic actuator of modulating valve control.This self-capacitance electrohydraulic actuator comprises: oil hydraulic cylinder 1, manipulation seat 2, stroke signal-transmitting machine 3, oil sources piece 5, one-way valve 48, accumulator 49 and control oil channel piece 6.The oil sources piece 5 of present embodiment is by fuel tank 41, and parts such as high pressure gear oil pump 42, the motor 43 that drives oil pump, high limit oil pressure pressure switch 50, lower bound oil pressure pressure switch 51 and oil-filled solenoid valve 52 are formed.Control oil channel piece 6 then is made up of parts such as electrohydraulic control 53, quick closing valve solenoid valve 54, unloading valve 47, oil feed non-return valve 56 and oil extraction one-way valves 55.In the present embodiment, key character is, electrohydraulic control 53 adopts direct drive type electro-hydraulic servo valves, and promptly the DDV valve is compared with the common electrical hydraulic servo, and this valve has zero quiet consumption characteristics.
Also show the direction 01 that oil hydraulic cylinder 1 is opened among the figure.
Fill fluid in the fuel tank 41, the filler opening of oil pump 42 is switched in the oil reservoir of fuel tank 41, and the oil outlet of oil pump 42 is connected by the inflow entrance of pipeline with one-way valve 48.The outflow opening of one-way valve 48 is connected to the filler opening of accumulator 49 by pipeline, and this filler opening also serves as the oil outlet of accumulator 49 simultaneously.Another important feature is that the fluid of containing is antiwear hydraulic oil in the fuel tank in this example, rather than fire-resistant oil.This is the key of environmental protection design.
Oil-filled solenoid valve 52 is a two position two-way valve, and the one end is communicated with oil pipe between one-way valve 48 and the oil pump 42, and the other end is communicated to fuel tank 41 inside.High and low limit oil pressure pressure switch 50,51 is installed on the pipeline between the pressure oil inlet of accumulator 49 oil outlets and quick closing valve solenoid valve 54, and its contact is electrically connected in the control loop of oil-filled solenoid valve 52.When oil pressure reached the setting ceiling value, 50 actions of high limit oil pressure pressure switch made oil-filled solenoid valve 52 dead electricity, and open-minded, the oil pump unloading.When oil pressure reached the low limit value of setting, lower bound oil pressure pressure switch 51 action made oil-filled solenoid valve 52 charged, and turn-offs, and oil pump loads.
Be full of fluid in the fuel tank 41, oil pump 42 and motor 43 intermittent runnings.In the pressurising stage, oil-filled solenoid valve 52 turn-offs, and oil pump 42 loads, and the oil in the fuel tank 41 is squeezed into accumulator 49, and energy is stored.When pressurising behind predetermined high limit oil pressure, 50 actions of high limit oil pressure pressure switch, oil-filled solenoid valve 52 is open-minded, oil pump 42 unloadings can reduce energy consumption, this moment, the oil pressure of accumulator 49 remained unchanged.
Quick closing valve solenoid valve 54 is a two position three-way valve.The oil outlet of accumulator 49 is by the pressure oil inlet P mouth of pipeline connection to quick closing valve solenoid valve 54, the oil outlet A mouth of quick closing valve solenoid valve 54 divides two-way after by the oil circuit point of branching, one the tunnel is communicated with the control mouth C of unloading valve 47, and one the tunnel is communicated with the filler opening of oil feed non-return valve 56.The oil drain out T mouth of quick closing valve solenoid valve 54 is connected with fuel tank 41.The oil outlet of oil feed non-return valve 56 is communicated with the oil inlet P mouth of DDV valve 53.The oil drain out T mouth of DDV valve 53 is communicated to fuel tank 41 inside by an oil extraction one-way valve 55, is used for oil extraction, and its A mouth is communicated with the sealing of B mouth with oil hydraulic cylinder 1 control mouth.The P mouth of unloading valve 47 is communicated with oil hydraulic cylinder 1 control mouth by pipeline, and its T mouth is communicated to fuel tank 41 inside.Oil hydraulic cylinder 1 oil drain out is communicated to fuel tank 41 inside.
Oil extraction one-way valve 55 inside have a spring 57, pass through its T mouth when fuel tank 41 is discharged fluid at DDV valve 53, fluid could so just guarantee to remain certain fluid in DDV valve 53 from one-way valve row to fuel tank when having only oil pressure to surpass the tight power of spring 57, makes its stable action.
The another important feature of this example is, quick closing valve solenoid valve 54 and DDV valve 53 be for being connected in series, and can not cause the oil sources short circuit when guaranteeing arbitrary valve events, and guarantee the quick closing valve action preferentially.
Oil hydraulic cylinder 1 opening process is as follows, and the P mouth of DDV valve 53 and A mouth are communicated with, and the P mouth of quick closing valve solenoid valve 54 and A mouth are communicated with, and pressure oil flows out from accumulator 49, through quick closing valve solenoid valve 54, enters the control mouth of oil hydraulic cylinder 1 again through one-way valve 56 and DDV valve 53, makes it to open.At this moment, because the effect of oil pressure in the pipeline, the spool in the unloading valve 47 is compacted, the P mouth of unloading valve 47 and the sealing of T mouth.
After unlatching put in place, DDV valve 53 cut out, and fluid is trapped in the oil hydraulic cylinder 1, made its holding position.When oil hydraulic cylinder 1 was closed, the A mouth of DDV valve 53 and T mouth were communicated with, and trapped fuel in one-way valve 55 is discharged to fuel tank 41, closes oil hydraulic cylinder 1 at the T mouth of handling process DDV valve 53 under seat 2 spring actions more gradually in the oil hydraulic cylinder 1.Oil hydraulic cylinder 1 is closed when putting in place, and DDV valve 53 cuts out once more, makes oil hydraulic cylinder 1 come back to the pocketed oil state, and the holding position.The location of oil hydraulic cylinder 1 open and close direction is fed back by LVDT and is determined, the distance that moves can be regulated by the flow that DDV valve 53 control inflow oil hydraulic cylinders 1 are controlled the oil of mouth.
Quick closing valve solenoid valve 54 and unloading valve 47 are used to realize the quick closing valve of oil hydraulic cylinder 1.When oil hydraulic cylinder 1 needs quick closedown, the A mouth of quick closing valve solenoid valve 54 and T mouth are connected, cut off oil feeding line, simultaneously the pressure oil in the unloading valve 47 controls mouthful place pipeline is switched to fuel tank 41, be in passive state, spool in the unloading valve 47 is opened under the effect of oil hydraulic cylinder control oil pressure, and the P mouth of unloading valve 47 and T mouth are communicated with, and the control fluid of oil hydraulic cylinder is discharged by the P mouth and the outspoken speed of T of unloading valve 47.
At this moment, the oil pressure of oil hydraulic cylinder 1 reduces fast, though because the control action of automatic control system, the P mouth of DDV valve 53 and A mouth are communicated with, and the oil circuit of pressure oil is cut off, therefore waste that can build-up of pressure oil.Fluid in the oil hydraulic cylinder 1 is via DDV valve 53, ended by oil feed non-return valve 56, because the employing of oil feed non-return valve 56, avoided fluid to flow to the control mouth pipeline of unloading valve 47 through DDV valve 53, thereby avoided in the unloading valve 47 control mouthful pipelines oil pressure to raise and closed unloading valve 47, influence the situation generation of quick closedown process.Chinese patent 200410103570.X discloses another kind of self-capacitance electrohydraulic actuator, the oil circuit shown in the accompanying drawing 2 of this patent wherein, accumulator 49 oil outlets are connected with the filler opening of quick closing valve solenoid valve 54 and the filler opening of DDV valve 53 respectively, and the oil outlet of DDV valve 53 is connected to oil hydraulic cylinder control mouth.The oil outlet of quick closing valve solenoid valve 54 is connected to the control mouth of unloading valve 47, and the oil drain out of quick closing valve solenoid valve 54 is connected to fuel tank.Quick closing valve solenoid valve 54 and unloading valve 47 are used to realize the quick closing valve of oil hydraulic cylinder 1.When oil hydraulic cylinder 1 needs quick closedown, open quick closing valve solenoid valve 54, the control mouth that pressure oil is switched to unloading valve 47 is opened it, and fluid is discharged by the P mouth and the outspoken speed of T of unloading valve 47.When realizing quick closedown, fluid in the oil hydraulic cylinder is discharged by unloading valve 47, the piston of oil hydraulic cylinder moves to closing direction, because this moment, given location was constant, closed loop control system will automatically adjust, piston is resetted to opening direction, therefore the P mouth and the A mouth of DDV valve 53 can be connected, this moment, fluid will be by accumulator 49 through DDV valve 53, and the pipeline through being communicated with the P mouth of unloading valve 47 flows away through unloading valve 47 more then, cause the loss of fluid, increased system energy consumption.To this, a kind of handling is to provide control signal when the quick closing valve by automatic control system, DDV valve 53 is forced to place closed condition, but internal system is calculated and needed the time, closing of DDV valve has certain hysteresis, still can cause partial pressure oil to run off meaninglessly.
In the opening process of oil hydraulic cylinder 1, the oil in the accumulator 49 can flow out oil pressure is descended, and after oil pressure dropped to predetermined lower bound oil pressure, 51 actions of lower bound oil pressure pressure switch were closed oil-filled solenoid valve 52, and oil pump 42 loads, and reenters the pressurising stage.
Above-described oil pipe line, oil removing pump discharge are manifold block internal bore passage to the oil feed line of one-way valve, can not leak; The main oil pump oil feed line is a short tube, at fuel tank internal, and its leakage of having taken measures on the structure to prevent, if just in case leak, can only drain to fuel tank internal, initiation fire can not leak outside yet.
Embodiment two:
With reference to shown in Figure 2, be second embodiment of the invention, promptly be used for the oil circuit schematic representation of the self-capacitance electrohydraulic actuator of main stop valve control.The present embodiment and first embodiment's difference is that the movement test solenoid valve 53 ' in the present embodiment is equivalent to the electrohydraulic control 53 among first embodiment, and the oil outlet of oil feed non-return valve 56 is communicated with the oil inlet P mouth of movement test solenoid valve 53 '.The oil drain out T mouth of movement test solenoid valve 53 ' is communicated to fuel tank 41 inside by an oil extraction one-way valve 55, is used for oil extraction, and its A mouth is communicated with oil hydraulic cylinder 1 control mouth.Simultaneously the stroke signal-transmitting machine 3 among first embodiment is changed into the position limit switch group 3 in the present embodiment.Oil hydraulic cylinder unlatching, the course of action when closing with quick closing valve and first embodiment are basic identical, no longer repeat, just present embodiment can be realized to the state demonstration of oil hydraulic cylinder 1 standard-sized sheet position and complete shut-down position with to testing the feedback of status of position by position limit switch group 3 is connected to electric control system.
In sum, the design of this self-capacitance electrohydraulic actuator has following characteristics:
1, at first is with the oil sources station decentralized and miniaturization.Decentralized, change the mode of oil sources station of system by a plurality of electro-hydraulic actuator fuel feeding of external oil pipe road direction the mode of an oil sources piece into exactly to an electro-hydraulic actuator fuel feeding, do like this, can cancel the oil outer pipeline of extensive distribution, simultaneously can failure risk is decentralized, area of influence is dwindled.
2, energy-conservationization, environmental protectionization are decentralized and the basis of miniaturization.
3, because the energy-saving design of electro-hydraulic actuator makes fuel consumption reduce to minimum.Energy-saving design comprises the quiet consumption of system zero, the design of oil hydraulic cylinder non-internal leakage, selects the DDV valve of no quiet consumption for use, and hydraulic element select for use low zero to leak element.
4, oil sources piece energy-saving design comprises the accumulator continuous oil supply, and the pressure regulation oil consumption is saved in pressure switch, the pressure regulation of electromagnetic valve switch type; Press the average fuel economy design, average consumprion is much smaller than characteristics such as maximum fuel consumption, and energy-saving design reduces heating value, saves the oil cooler system.
5, the oil outer pipeline is saved in integrated design, has avoided danger such as leakage that oil outer pipeline fault causes, fire, has improved Security, reliability, can be without fire-resistant oil.
6, without fire-resistant oil, eliminated the danger of environmental pollution, have the feature of environmental protection, saved the distinctive reclaimer of Anti-fuel Oil System.Use antiwear hydraulic oil instead, can save heater.
7, owing to save oil cooler, reclaimer, heater, oil outer pipeline, oil supply system is simplified greatly, designs simplification, cost reduces, and safety reliability improves, and, miniaturization decentralized for realizing, integrated creating conditions.
The foregoing description description of this invention is not that content of the present invention is done further to limit, and is equal to replacement to what technical characteristics of the present invention was done, or corresponding the improvement, still belongs within protection scope of the present invention.
For example, though the oil hydraulic cylinder among the embodiment is one-sided oil-feed, spring reset formula,, also can make one-sided oil-feed, oil pressure homing position type, or bilateral oil-feed, asymmetric cylinder formula.The oil circuit of its control oil channel piece is different, but structural type is identical.These embodiments have listed in the Series Design of the present invention, still belong in the protection domain of this patent.
Claims (5)
1, a kind of self-capacitance electrohydraulic actuator, comprise oil hydraulic cylinder, the control oil channel piece reaches and the integrated oil sources piece of described control oil channel piece, described oil sources piece comprises fuel tank, motor and oil pump, described control oil channel piece comprises quantity control valve, unloading valve and quick closing valve solenoid valve, described quantity control valve oil outlet and described unloading valve filler opening are connected with described oil hydraulic cylinder control mouth respectively, described unloading valve oil outlet and described quick closing valve solenoid valve oil drain out are connected to described fuel tank respectively, it is characterized in that, described quick closing valve solenoid valve filler opening is connected with described oil sources piece, and described quick closing valve solenoid valve oil outlet is connected with unloading valve control mouth with described quantity control valve filler opening respectively.
2, self-capacitance electrohydraulic actuator as claimed in claim 1, it is characterized in that, also comprise accumulator, one-way valve, described oil sources piece also comprises oil-filled solenoid valve, described one-way valve filler opening is connected with the oil pump oil outlet, and described one-way valve oil outlet is connected with described accumulator filler opening, and described accumulator oil outlet is an oil sources piece oil outlet, described oil-filled solenoid valve filler opening is connected on the pipeline between oil pump oil outlet and the one-way valve filler opening, and described oil-filled solenoid valve oil outlet is connected with fuel tank.
3, self-capacitance electrohydraulic actuator as claimed in claim 1 or 2, it is characterized in that, described control oil channel piece also comprises an oil feed non-return valve, described quick closing valve solenoid valve oil outlet is connected with unloading valve control mouth with the oil feed non-return valve filler opening respectively by an oil circuit point of branching, described oil feed non-return valve is installed between described oil circuit point of branching and the described quantity control valve filler opening, and described oil feed non-return valve oil outlet is connected with described quantity control valve filler opening.
4, self-capacitance electrohydraulic actuator as claimed in claim 1 is characterized in that:
Also comprise the stroke signal-transmitting machine, described stroke signal-transmitting machine is connected with oil hydraulic cylinder bottom spring, and described quantity control valve is a direct drive type electro-hydraulic servo valve; Perhaps
Also comprise the position limit switch group, described position limit switch group is connected with oil hydraulic cylinder bottom spring, and described quantity control valve is the movement test solenoid valve.
5, self-capacitance electrohydraulic actuator as claimed in claim 1 is characterized in that: this self-capacitance electrohydraulic actuator adopts antiwear hydraulic oil.
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| CNB2007101260909A CN100494697C (en) | 2007-07-11 | 2007-07-11 | Self-capacitance electrohydraulic executor |
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| CNB2007101260909A CN100494697C (en) | 2007-07-11 | 2007-07-11 | Self-capacitance electrohydraulic executor |
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2007
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103452952A (en) * | 2013-09-22 | 2013-12-18 | 浙江贝尔控制阀门有限公司 | Integrally-controlled intelligent energy-storage reset electro-hydraulic actuator |
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| CN101074685A (en) | 2007-11-21 |
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