CN107355263A - A kind of small machine highback pressure control system of water pump - Google Patents
A kind of small machine highback pressure control system of water pump Download PDFInfo
- Publication number
- CN107355263A CN107355263A CN201710342688.5A CN201710342688A CN107355263A CN 107355263 A CN107355263 A CN 107355263A CN 201710342688 A CN201710342688 A CN 201710342688A CN 107355263 A CN107355263 A CN 107355263A
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- pressure
- valve
- servomotor
- oil
- small machine
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/20—Devices dealing with sensing elements or final actuators or transmitting means between them, e.g. power-assisted
- F01D17/22—Devices dealing with sensing elements or final actuators or transmitting means between them, e.g. power-assisted the operation or power assistance being predominantly non-mechanical
- F01D17/26—Devices dealing with sensing elements or final actuators or transmitting means between them, e.g. power-assisted the operation or power assistance being predominantly non-mechanical fluid, e.g. hydraulic
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/08—Adaptations for driving, or combinations with, pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Turbines (AREA)
Abstract
The present invention relates to a kind of small machine highback pressure control system of water pump, the small machine MEH hydraulic control systems of A and the small machine MEH hydraulic control systems of the B include high-pressure main throttle valve servomotor, high voltage adjusting door servomotor, low-pressure adjusting section door servomotor, low pressure main inlet throttle-stop valve servomotor, emergency trip device, accumulator package, oil pipe line system and isolation block assembly.Beneficial effects of the present invention are：The invention utilizes high pressure main stop valve executing agency, high voltage adjusting valve actuating mechanism, low pressure stop valve executing agency, low pressure modulating valve executing agency, emergency trip device, high-low pressure accumulator package and oil circuit in every small machine MEH hydraulic control systems to isolate the cooperation of block assembly using the control system of high pressure fireresistant oil, effectively solves the problems, such as that control accuracy is low.
Description
Technical field
The present invention relates to water pump steam turbine control system field, specially a kind of small machine highback pressure control system of water pump.
Background technology
Boiler feed pump turbine, it is gradually old using low pressure turbine EFM Electronic Fuel Management that is electro-hydraulic and depositing, control system
Change, control accuracy can not meet to require.
The content of the invention
In order to overcome current boiler feed pump turbine, using low pressure turbine EFM Electronic Fuel Management that is electro-hydraulic and depositing, control
The gradual aging of system processed, the problem of control accuracy can not meet to require, the invention provides a kind of small machine highback of water pump is voltage-controlled
System processed, the invention utilize the high pressure master in every small machine MEH hydraulic control systems using the control system of high pressure fireresistant oil
Steam valve executing mechanism, high voltage adjusting valve actuating mechanism, low pressure stop valve executing agency, low pressure modulating valve executing agency, critical screening
The cooperation of disconnected device, high-low pressure accumulator package and oil circuit isolation block assembly, effectively solves the problems, such as that control accuracy is low.
To achieve these goals, the present invention provides following technical scheme：
A kind of small machine highback pressure control system of water pump, including two MEH hydraulic control systems and EH oil supply systems；
Two MEH hydraulic control systems are respectively the small machine MEH hydraulic control systems of A and the small machine MEH hydraulic control systems of B,
The small machine MEH hydraulic control systems of A are identical with the control system of the small machine MEH hydraulic control systems of the B, and are connected in parallel on one
Rise；
The EH oil supply systems are the small machine MEH hydraulic control systems of the A and the small machine MEH hydraulic control system fuel feeding of the B；
The small machine MEH hydraulic control systems of A and the small machine MEH hydraulic control systems of the B include high-pressure main throttle valve servomotor,
High voltage adjusting door servomotor, low-pressure adjusting section door servomotor, low pressure main inlet throttle-stop valve servomotor, emergency trip device, accumulator package, oil
Pipe-line system and isolation block assembly, the high-pressure main throttle valve servomotor, the high voltage adjusting door servomotor, the low-pressure adjusting section door
Servomotor and the low pressure main inlet throttle-stop valve servomotor are connected in parallel, the high-pressure main throttle valve servomotor, high voltage adjusting door oil
Motivation, the low-pressure adjusting section door servomotor, the low pressure main inlet throttle-stop valve servomotor, the emergency trip device, the accumulator group
Part is with isolation block assembly by together with oil pipe line systematic connection；The accumulator package is used to store oil unnecessary in oil circuit
Amount；The emergency trip device is used to protect system；The isolation block assembly is used to isolate MEH hydraulic control systems and EH fuel feeding
System.
Further, the main inlet throttle-stop valve servomotor and the low pressure main inlet throttle-stop valve servomotor are provided with three stop valves, and institute
Stop valve is stated on pipeline；The high voltage adjusting door servomotor and the low-pressure adjusting section door servomotor are mounted on two and cut
Only valve, and the stop valve is arranged on pipeline.
Further, the accumulator package includes high pressure accumulator, low pressure accumulator and stop valve, the high pressure accumulator
On the EH oil supply systems pressure duct；The low pressure accumulator is arranged on low-pressure oil return pipe road；The high pressure stores
Energy device and entering on flowline for the low pressure accumulator are mounted on the stop valve.
Further, the emergency trip device includes electromagnetic valve component and beats gate valve, the electromagnetic valve component and hand manually
It is dynamic to beat gate valve and be in parallel.
Further, the electromagnetic valve component includes AST magnetic valves, pressure switch component, throttle orifice, pressure gauge, pressure change
Device and integrated package are sent, the AST magnetic valves are four, and AST magnetic valves described in two of which are in parallel, AST electromagnetism described in another two
Valve is connected；The throttle orifice is two, and on oil circuit；The pressure gauge is two, for showing hydraulic fluid pressure；Institute
Pressure transmission device is stated to be used to, by the safe oil pressure of system AST, be sent to control system in real time；The integrated package is described for controlling
AST magnetic valves, pressure switch component and pressure gauge；The pressure switch component is used to judge to hang whether lock succeeds.
Further, the pressure switch component is provided with some pressure switches.
Further, described to beat gate valve manually and include hand-operated valve and main valve plug, when hanging lock, the hand-operated valve is by the main valve
The control oil pocket and nothing on core top push back oily cut-off.
Further, the high voltage adjusting door servomotor and the low-pressure adjusting section door servomotor include filter core, electro-hydraulic servo
Valve and Linear displacement transducer, the filter core are used to filter fluid；The electrohydraulic servo valve includes torque-motor and two-stage hydraulic pressure
Amplification and mechanical feedback system are formed；The two-stage hydraulic pressure amplification is respectively that the amplification of first order hydraulic pressure and second level hydraulic pressure are put
Greatly；The first order hydraulic pressure amplification is twin-jet nozzle and baffle system；The second level amplification is slide valve system；The linear displacement
Sensor is used for the aperture for experiencing steam valve.
Further, the high-pressure main throttle valve servomotor and the low pressure main inlet throttle-stop valve servomotor include oil cylinder, hydraulic manifold block,
Two-position four-way solenoid valve, fast unloading valve and spring-operated seat；The hydraulic manifold block is used to parts installation being connected to one
Rise；The two-position four-way solenoid valve is used for remote closing valve in operation, and can carry out regularly valve handle activity experiment；Institute
Fast unloading valve is stated to be used for hydraulic oil quick release；The spring-operated seat is used to provide power for stop valve shutoff valve door
Source.
The device have the advantages that including：
MEH systems are mainly made up of oil supply system, executing agency and emergency trip device three parts.Oil supply system is from big machine
EH oil fuellers, which are introduced through, to be come, and using the oil circuit isolated block assembly and can cut off big machine and small machine, maintains easily maintenance；Execution machine
High-pressure main throttle valve servomotor, high voltage adjusting door servomotor, low-pressure adjusting section door servomotor, low pressure main inlet throttle-stop valve servomotor in structure pass through
The electric command signal sent from MEH, to adjust each steam valve opening of steam turbine；Emergency trip device is the blocking ginseng by steam turbine
Several to be controlled, when these parameters exceed its run-limiting value, the system is shut off whole steam-turbine admission valves, to protect
Demonstrate,prove steam turbine normal safe operation；Using the dual host fault tolerance system of two MEH hydraulic control systems, it is standby each other, automatically switch,
On-line maintenance.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the hydraulic principle figure of the small machine highback pressure control system of water pump of the present invention；
Fig. 2 is the hydraulic principle of the small machine MEH hydraulic control systems of A of the small machine highback pressure control system of water pump of the present invention
Figure；
Fig. 3 be the small machine highback pressure control system of water pump of the present invention the small machine MEH hydraulic control systems of A in electromagnetic valve component
Hydraulic schematic diagram；
Fig. 4 be the small machine highback pressure control system of water pump of the present invention the small machine MEH hydraulic control systems of A in emergency trip fill
The hydraulic schematic diagram put.
1st, high-pressure main throttle valve servomotor；2nd, high voltage adjusting door servomotor；3rd, low-pressure adjusting section door servomotor；4th, low pressure main inlet throttle-stop valve
Servomotor；5th, emergency trip device；6th, accumulator package；7th, oil pipe line system；8th, block assembly is isolated.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, technical scheme will be carried out below
Detailed description.Obviously, described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art are resulting on the premise of creative work is not made to be owned
Other embodiment, belong to the scope that the present invention is protected.
As Figure 1-Figure 4, the invention provides a kind of small machine highback pressure control system of water pump, including two MEH hydraulic pressure
Control system and EH oil supply systems；
Two MEH hydraulic control systems are respectively the small machine MEH hydraulic control systems of A and the small machine MEH hydraulic control systems of B,
The small machine MEH hydraulic control systems of A are identical with the control system of the small machine MEH hydraulic control systems of the B, and are connected in parallel on one
Rise；
The EH oil supply systems are the small machine MEH hydraulic control systems of the A and the small machine MEH hydraulic control system fuel feeding of the B；
The small machine MEH hydraulic control systems of A and the small machine MEH hydraulic control systems of the B include high-pressure main throttle valve servomotor
1st, high voltage adjusting door servomotor 2, low-pressure adjusting section door servomotor 3, low pressure main inlet throttle-stop valve servomotor 4, emergency trip device 5, accumulator
Component 6, oil pipe line system 7 and isolation block assembly 8, the high-pressure main throttle valve servomotor 1, the high voltage adjusting door servomotor 2, institute
State low-pressure adjusting section door servomotor 3 and the low pressure main inlet throttle-stop valve servomotor 4 is connected in parallel, the high-pressure main throttle valve servomotor 1, institute
State high voltage adjusting door servomotor 2, the low-pressure adjusting section door servomotor 3, the low pressure main inlet throttle-stop valve servomotor 4, the emergency trip
Device 5, the accumulator package 6 and isolation block assembly 8 are linked together by oil pipe line system 7；The accumulator package 6
For storing oil mass unnecessary in oil circuit；The emergency trip device 5 is used to protect system；It is described isolation block assembly 8 be used for every
From MEH hydraulic control systems and EH oil supply systems.
The main inlet throttle-stop valve servomotor and the low pressure main inlet throttle-stop valve servomotor 4 are provided with three stop valves, and the cut-off
Valve is arranged on pipeline；The high voltage adjusting door servomotor 2 and the low-pressure adjusting section door servomotor 3 are mounted on two cut-offs
Valve, and the stop valve is arranged on pipeline.
The accumulator package 6 includes high pressure accumulator, low pressure accumulator and stop valve, and the high pressure accumulator is arranged on
On the EH oil supply systems pressure duct；The low pressure accumulator is arranged on low-pressure oil return pipe road；The high pressure accumulator and
Entering on flowline for the low pressure accumulator is mounted on the stop valve.
The emergency trip device 5 includes electromagnetic valve component and beats gate valve manually, the electromagnetic valve component with make lock manually
Valve is in parallel.
The electromagnetic valve component include AST magnetic valves, pressure switch component, throttle orifice, pressure gauge, pressure transmitter and
Integrated package, the AST magnetic valves are four, and AST magnetic valves described in two of which are in parallel, and AST magnetic valves described in another two are connected；
The throttle orifice is two, and on oil circuit；The pressure gauge is two, for showing hydraulic fluid pressure；The pressure
Speed changer is used to, by the safe oil pressure of system AST, be sent to control system in real time；The integrated package is used to control the AST electromagnetism
Valve, pressure switch component and pressure gauge；The pressure switch component is used to judge to hang whether lock succeeds.
The pressure switch component is provided with some pressure switches.
Described to beat gate valve manually and include hand-operated valve and main valve plug, when hanging lock, the hand-operated valve is by the main valve plug top
Control oil pocket and without pushing back oily cut-off.
The high voltage adjusting door servomotor 2 and the low-pressure adjusting section door servomotor 3 include filter core, electrohydraulic servo valve and line
Property displacement transducer, the filter core be used for filter fluid；The electrohydraulic servo valve include torque-motor and two-stage hydraulic pressure amplification and
Mechanical feedback system is formed；The two-stage hydraulic pressure amplification is respectively the amplification of first order hydraulic pressure and the amplification of second level hydraulic pressure；It is described
The amplification of first order hydraulic pressure is twin-jet nozzle and baffle system；The second level amplification is slide valve system；The Linear displacement transducer
For experiencing the aperture of steam valve.
The high-pressure main throttle valve servomotor 1 and the low pressure main inlet throttle-stop valve servomotor 4 include oil cylinder, hydraulic manifold block, two
Four way solenoid valve, fast unloading valve and spring-operated seat；The hydraulic manifold block is used to link together parts installation；Institute
State two-position four-way solenoid valve and be used for remote closing valve in operation, and regularly valve handle activity experiment can be carried out；It is described fast
Fast unloading valve is used for hydraulic oil quick release；The spring-operated seat is used to provide power resources for stop valve shutoff valve door.
During machine highback pressure control system small using above-mentioned water pump：
The open and close of the regulating valve of high voltage adjusting door servomotor 2 and the low-pressure adjusting section door servomotor 3 are by fire-resistant oil pressure
Power drives.The oil cylinder of servo control mechanism, belong to the oil cylinder of bilateral oil-feed, hydraulic jack is connected with a hydraulic manifold block, at this
Clearance filter and electrohydraulic servo valve are housed on hydraulic manifold block.In addition, in servomotor quick closedown, in order that steam valve disc with
The impact stress of valve seat keeps in allowed limits, hydraulic damping device being used in servomotor piston close side, will can move
The major part that can be accumulated is in the energy that the last umklappen that impact occurs is fluid.The servomotor of this type belongs to control
Type, can control steam valve on the optional position of stroke, proportionally adjust throttle flow to meet the needs of.
Its operation principle is as follows：
After the electric signal for being intended to out greatly or turning down steam valve after computer calculation process is amplified by servo amplifier, electro-hydraulic
By transform electric into hydraulic pressure signal in converter-servo valve, move servo valve main valve, and after hydraulic pressure signal is amplified
The passage of hydraulic oil is controlled, hydraulic oil is entered oil cylinder piston epicoele, oil cylinder piston cavity of resorption connects oil return.Make piston to moving down
It is dynamic, it is allowed to increase aperture through lever drives steam valve, or pressure oil enters piston cavity of resorption, piston upper chamber is connected back through servo valve
Oil, piston move up, and reduce steam valve aperture.When the piston is moving, while the pull bar of two Linear displacement transducers is driven (i.e.
LVDT), the mechanical displacement of servomotor piston is converted into electric signal by displacement transducer, is calculated as negative-feedback signal in MEH
It is added, due to both opposite polarities, actually subtracts each other, only in original input signal and feedback letter with command signal inside machine
After number being added, after the signal that makes input servo amplifier is zero, at this moment the main valve of servo valve returns to centre position, on servomotor
Chamber, cavity of resorption no longer communicate with oil-feed, oil return, and now steam valve just stops moving, and are maintained at a new operating position.Regulating valve
There is a servo valve on the integrated package of servomotor, when steam turbine breaks down needs shutdown rapidly, MEH tripping electromagnetic valves lose
Fire resistant oil beats gate valve and makes TP Safety oil ventings manually on the spot for electricity, the AST Safety oils of venting stop valve servomotor, or operation, opens
The drain path of AST Safety oils, stop valve servomotor is set to close rapidly；MEH receives trip signal and moved to regulation valve oil simultaneously
The big closing current signal of the servo valve one of machine, leads to oil cylinder piston cavity of resorption by hydraulic oil rapidly, and oil cylinder piston epicoele is connected
Oil return, promptly lever is driven to close control valve.
Electrohydraulic servo valve is made up of a torque-motor and the amplification of two-stage hydraulic pressure and mechanical feedback system.First order liquid
Press is twin-jet nozzle and baffle system greatly；Second level amplification is slide valve system, and its principle is as follows：When there is servomotor to be made action
When electric signal is inputted by servo amplifier, then just there is electric current in the electromagnet coil in Servo-Valve Torque Motor by and two
Under other magnet effect, producing a turning moment rotates armature, while drives the flapper being attached thereto, and this baffle plate reaches
Among two nozzles.In normal table operating mode, baffle plate both sides are equal with the distance of nozzle, make both sides nozzle
Drainage area it is equal, then the oil pressure of nozzle both sides is equal.When there is an electric signal input, when armature drives flapper,
Then baffle plate shifts near a nozzle, the drainage area of this nozzle is diminished, and flow diminishes, and the oil pressure before nozzle uprises, and offside
Nozzle and baffle plate between distance become big, dredge oil amount increase, make the oil pressure step-down before nozzle, thus by original electric signal
It is changed into torque and produces mechanical displacement signal, then be changed into fuel injection pressure signal, and is amplified signal by nozzle flap.Gear
Oil pressure communicates with the two chambers of bottom guiding valve before the nozzle of plate both sides, therefore, when the oil pressure before two nozzles does not wait, then slides
The oil pressure at valve both ends is also unequal, and the oil pressure official post guiding valve at both ends is mobile and is opened or is closed by the hydraulic fluid port of the convex shoulder control on guiding valve
Close, to control hydraulic oil to lead to servomotor piston upper chamber, servomotor piston cavity of resorption is connected with oil return, opens steam valve；Or by height
Force feed leads to servomotor piston cavity of resorption, and piston upper chamber leads to oil return simultaneously, closes steam valve.In order to increase the reliable of regulating system
Property, feedback spring is provided with servo valve and when servo valve adjusts provided with certain mechanical bias, so, if running
When middle servo valve control coil powers off or loses electric signal suddenly, guiding valve is finally offset side by means of mechanical forces, make to watch
Valve main valve plug negative bias is taken, steam valve is closed.
Linear displacement transducer is made up of core bar, coil, shell etc..TD series displacement transducers are with differential transformation
The displacement transducer of device principle composition, the Wuxi river equal supply of material.
When there is relative movement between iron core and coil, such as iron core moves up, and the electromotive force that secondary coil induces is by whole
After stream filtering, just it is changed into representing the electric signal output of relative displacement between iron core and coil, as negative-feedback.In specific equipment,
Shell is fixed, and iron core is connected by lever with servomotor piston rod, and the electric signal of output can simulate the displacement of servomotor,
The namely aperture of steam valve, in order to improve the reliability of control system, two displacement sensings are installed in each regulating valve oil motivator
Device, recommend to use Gao Xuan in MEH computers part.
The high pressure and low pressure stop valve servomotor of high pressure main stop valve servomotor and low pressure stop valve servomotor are all switching modes
Servomotor, valve work on standard-sized sheet or closed positions.When MEH Safety oils (AST) are not set up（That is the small steam turbine of feed pump does not hang lock
When）The high pressure oil-feed of servomotor enters oil cylinder cavity of resorption by throttle orifice, but now because Safety oil is not set up, unloading valve main valve
It can not close, so oil-feed is led to by unloading valve pushes back oil, oil cylinder cavity of resorption can not establish pressure oil, and servomotor can not be opened
Open；MEH hangs Safety oil after lock（AST）Establish, unloading valve main valve is closed, and high pressure oil-feed gets enter into oil cylinder cavity of resorption, and servomotor delays
It is slow to open until standard-sized sheet.The latus rectum size of the throttle orifice influences the opening time of servomotor.
Stop valve servomotor is installed on the support of main inlet throttle-stop valve vaporium with manipulating seat, its piston rod, manipulate seat bar with
Valve rod is connected.Therefore, piston upwards Open valve, closing valve is moved downward, servomotor is unilateral effect, opens vapour
Door leans on the thrust of servomotor, closes spring force of the porthole by manipulation seat.
Hydraulic manifold block is used for that used unit is installed and linked together, and all electric interfaces and hydraulic interface
Connector.
Two-position four-way solenoid valve is used for remote closing valve in operation to be tested with carrying out regularly valve handle activity.To electromagnetism
During 220 volts of alternating voltages of valve coil band, it opens stop valve servomotor oil cylinder cavity of resorption and the passage of pressure oil return, by under oil cylinder
The pressure oil of chamber is discharged into pressure oil return through the magnetic valve and throttle orifice, and the pressure of oil cylinder cavity of resorption is slowly reduced makes stop valve
Valve rod slowly closes down.The latus rectum size of the throttle orifice influences the closing velocity of valve rod and last close stance during valve test
Put.
Fast unloading valve be arranged on servomotor hydraulic manifold block on, its main function be when unit break down must promptly
During shutdown, series-parallel 4 tripping electromagnetic valve dead electricity, cause MEH Safety oil AST decompressions, make unloading valve main valve open, servomotor
The pressure oil of piston cavity of resorption, in the case where valve closes spring-force driven dual, makes valve rapid-closing through unloading valve quick release.In off-load
There is a cup-shaped guiding valve in valve, the underpiston high-pressure oil passage of chamber and servomotor in guiding valve bottom communicates.Answer on guiding valve top
Position grease chamber communicates with emergency trip oil AST all the way, and another way is through a needle-valve and servomotor piston upper chamber and drainback passage phase
Even.Throttle orifice is the reset oil for producing the valve, once the throttle orifice blocks, then can produce and to reset that oil reduces or decompression shows
As unloading valve main valve will be opened, it will directly affect the normal control of servomotor, influence the operation of small steam turbine., should during debugging
Needle-valve is killed on valve seat completely with regulation handle, is only used to just turn on this needle-valve during manual off-load at the scene.In normal operation
When, the oil pressure active force on guiding valve top will be greater than the active force of hydraulic oil under guiding valve plus spring force, and cup-shaped guiding valve is pressed in base
On, close the hydraulic fluid port that hydraulic oil communicates with oil cylinder oil return.The hydraulic oil of oil cylinder piston cavity of resorption is established.Servomotor is opened.Damping
Hole is to play stabilization to guiding valve, in order to avoid unfavorable vibration is produced when system oil pressure changes.Coarse strainer can prevent big
Grain, which enters, blocks damping hole.
Spring-operated seat is the power resources that stop valve closes valve, and the stop valve servomotor as security department's set is using single
Side servomotor, avoid bilateral servomotor when drive oil pressure lose after can not close valve the problem of.Spring-operated seat with valve
Ensure that the spring base inside spring-operated seat has appropriate gap from the supporting surface in its underpart after bar assembling, to ensure its spring
Active force is carried on valve rod and valve all the time.
The section hydraulic that hydraulic system is exported oil pump in certain time using accumulator can be stored up, in short time or all
Executing agency's discharge pressure fluid is given to phase property, or as emergent power source, or for making certain part liquid in oil pump off-load
Pressure system keeps constant pressure.Power of motor consumption can be so reduced, reduces system temperature rise, improves system hydraulic energy utilization rate；Tool
There is the function of the oil leak consumption in compensation pressure and flow loss and replenishment system.
When absorb oil pump because start or stop etc. suddenly and caused by pulsation, reduce because hydraulic valve is closed or commutated suddenly
Caused system shock power.
High pressure accumulator is arranged on high pressure EH oil in-lines, and inflated with nitrogen theory setting valve is 9.1-8.4MPa,
When line is changed, need to only close before accumulator it is normally opened enter oil cut-off valve SHV25, then, open its normally closed oil return stop valve
SHV6.4 off-loads, off-load is waited to terminate to pull down accumulator.
Low pressure accumulator is arranged on low-pressure oil return pipe road, and inflation setting valve is 0.21-0.17MPa, and its effect is mainly
Absorb the pulsatile impact power in oil return system.It is online when changing, need to only close before accumulator it is normally opened enter oil cut-off valve SHV25,
Then, its normally closed oil return stop valve SHV6.4 off-load is opened, waits off-load to terminate to pull down accumulator.
Electromagnetic valve component module is mainly by four AST magnetic valves, pressure switch component, two throttle orifices, two pressure
Table, a pressure transmitter and an integrated package composition, four AST magnetic valves use two and two string structures, can prevent malfunction
And tripping, there is high security and stability.
In normal operation, they are to be energized excitation closing, so as to enclose in autostop emergency trip main pipe
Fire resistant oil drain path, it is closed stop valve servomotor unloading valve, so that high pressure and low pressure main steam valve perform
The oil pressure of mechanism piston cavity of resorption can be set up.When magnetic valve dead electricity is opened, then house steward's draining, cause all steam valves close and
Shut down steam turbine.
AST magnetic valves are composition connection in series-parallel arrangements, thus there is multiple protectiveness.At least must an electricity in each passage
Magnet valve is opened, and can just cause to shut down.While reliability is also improved, any one damage or refused action in four AST magnetic valves
Shutdown will not be caused.
Pressure switch component is made up of five pressure switches and some annexes.Wherein, PS1, PS2, PS3 monitor high-voltage safety
Oil pressure, its effect are：After unit hangs lock, pressure switch component sends the letter whether feed pump turbine high-pressure Safety oil is established
Number control system is given, judge to hang the whether successful condition of lock as control system.After when unit interdicts, system high pressure peace
Full oil loses, PS1, PS2, PS3 send unit obstruction signal to control system, the signal and resetted again as small machine one
Individual condition.PS4, PS5 are four AST magnetic valves used in thread test.
One pressure transmitter, by the safe oil pressure of system AST, control system is sent in real time.
It is that a hand-operated valve controls a main valve plug to beat gate valve manually.In the case of Gua Zha, hand-operated valve is by main valve plug
The control oil pocket and nothing in portion push back oily cut-off, and main valve plug control throttle orifice of the oil pocket through bottom leans on main valve plug to form pressure oil
AST Safety oils and DV no pressure oil returns have been cut off on valve seat.When making lock manually, manual valve events, main valve plug is controlled into oil
Chamber turns on DV no pressure oil returns, release.Main valve plug is opened rapidly under the active force of the hydraulic oil of bottom, make AST safe
Oily release.The oil circuit of the valve and the oil circuit of AST tripping electromagnetic valves are in parallel.
X representative pressures oil in wherein Fig. 2；Y representative pressure oil returns；Z represents no pressure oil return；W represents Safety oil.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (9)
- A kind of 1. small machine highback pressure control system of water pump, it is characterised in that：Including two MEH hydraulic control systems and EH fuel feeding system System；Two MEH hydraulic control systems are respectively the small machine MEH hydraulic control systems of A and the small machine MEH hydraulic control systems of B, The small machine MEH hydraulic control systems of A are identical with the control system of the small machine MEH hydraulic control systems of the B, and are connected in parallel on one Rise；The EH oil supply systems are the small machine MEH hydraulic control systems of the A and the small machine MEH hydraulic control system fuel feeding of the B；The small machine MEH hydraulic control systems of A and the small machine MEH hydraulic control systems of the B include high-pressure main throttle valve servomotor, High voltage adjusting door servomotor, low-pressure adjusting section door servomotor, low pressure main inlet throttle-stop valve servomotor, emergency trip device, accumulator package, oil Pipe-line system and isolation block assembly, the high-pressure main throttle valve servomotor, the high voltage adjusting door servomotor, the low-pressure adjusting section door Servomotor and the low pressure main inlet throttle-stop valve servomotor are connected in parallel, the high-pressure main throttle valve servomotor, high voltage adjusting door oil Motivation, the low-pressure adjusting section door servomotor, the low pressure main inlet throttle-stop valve servomotor, the emergency trip device, the accumulator group Part is with isolation block assembly by together with oil pipe line systematic connection；The accumulator package is used to store oil unnecessary in oil circuit Amount；The emergency trip device is used to protect system；The isolation block assembly is used to isolate MEH hydraulic control systems and EH fuel feeding System.
- 2. the small machine highback pressure control system of water pump according to claim 1, it is characterised in that the main inlet throttle-stop valve servomotor and The low pressure main inlet throttle-stop valve servomotor is provided with three stop valves, and the stop valve is arranged on pipeline；The high voltage adjusting Door servomotor and the low-pressure adjusting section door servomotor are mounted on two stop valves, and the stop valve is arranged on pipeline.
- 3. the small machine highback pressure control system of water pump according to claim 1, it is characterised in that the accumulator package includes High pressure accumulator, low pressure accumulator and stop valve, the high pressure accumulator are arranged on the EH oil supply systems pressure duct；Institute Low pressure accumulator is stated on low-pressure oil return pipe road；The high pressure accumulator and the low pressure accumulator enter on flowline The stop valve is installed.
- 4. the small machine highback pressure control system of water pump according to claim 1, it is characterised in that the emergency trip device bag Include electromagnetic valve component and beat gate valve manually, the electromagnetic valve component and manual beat gate valve and be in parallel.
- 5. the small machine highback pressure control system of water pump according to claim 4, it is characterised in that the electromagnetic valve component includes AST magnetic valves, pressure switch component, throttle orifice, pressure gauge, pressure transmitter and integrated package, the AST magnetic valves are four, AST magnetic valves described in two of which are in parallel, and AST magnetic valves described in another two are connected；The throttle orifice is two, and installed in oil Lu Shang；The pressure gauge is two, for showing hydraulic fluid pressure；The pressure transmission device is used for system AST Safety oils Pressure, is sent to control system in real time；The integrated package is used to control the AST magnetic valves, pressure switch component and pressure gauge；Institute Pressure switch component is stated to be used to judge to hang whether lock succeeds.
- 6. the small machine highback pressure control system of water pump according to claim 5, it is characterised in that the pressure switch component is set It is equipped with some pressure switches.
- 7. the small machine highback pressure control system of water pump according to claim 6, it is characterised in that described to beat gate valve manually and include Hand-operated valve and main valve plug, when hanging lock, the control oil pocket on the main valve plug top and nothing are pushed back oily cut-off by the hand-operated valve.
- 8. the small machine highback pressure control system of water pump according to claim 1, it is characterised in that the high voltage adjusting door oil is dynamic Machine and the low-pressure adjusting section door servomotor include filter core, electrohydraulic servo valve and Linear displacement transducer, and the filter core was used for Oil strain liquid；The electrohydraulic servo valve includes torque-motor and the amplification of two-stage hydraulic pressure and mechanical feedback system is formed；The two-stage Hydraulic pressure amplification is respectively the amplification of first order hydraulic pressure and the amplification of second level hydraulic pressure；The first order hydraulic pressure amplification is twin-jet nozzle and baffle plate System；The second level amplification is slide valve system；The Linear displacement transducer is used for the aperture for experiencing steam valve.
- 9. the small machine highback pressure control system of water pump according to claim 1, it is characterised in that the high-pressure main throttle valve oil is dynamic Machine and the low pressure main inlet throttle-stop valve servomotor include oil cylinder, hydraulic manifold block, two-position four-way solenoid valve, fast unloading valve and spring behaviour Vertical seat；The hydraulic manifold block is used to link together parts installation；The two-position four-way solenoid valve is used in operation Remote closing valve, and regularly valve handle activity experiment can be carried out；The fast unloading valve is used for hydraulic oil quick release； The spring-operated seat is used to provide power resources for stop valve shutoff valve door.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710342688.5A CN107355263A (en) | 2017-05-16 | 2017-05-16 | A kind of small machine highback pressure control system of water pump |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710342688.5A CN107355263A (en) | 2017-05-16 | 2017-05-16 | A kind of small machine highback pressure control system of water pump |
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| CN107355263A true CN107355263A (en) | 2017-11-17 |
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| CN201710342688.5A Pending CN107355263A (en) | 2017-05-16 | 2017-05-16 | A kind of small machine highback pressure control system of water pump |
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Cited By (5)
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| CN108005736A (en) * | 2017-11-24 | 2018-05-08 | 胡莎 | The small machine high back pressure heating system of feed pump and device |
| CN108361081A (en) * | 2018-04-24 | 2018-08-03 | 长兴永能动力科技有限公司 | A kind of back pressure type centripetal turbine machine unloading protection equipment |
| CN110242363A (en) * | 2019-03-14 | 2019-09-17 | 华电电力科学研究院有限公司 | A kind of protection system of the high security for Turbo-generator Set |
| CN112343543A (en) * | 2020-10-10 | 2021-02-09 | 中国石油集团渤海钻探工程有限公司 | Electro-hydraulic flat valve for fine pressure control drilling |
| CN115938185A (en) * | 2023-02-03 | 2023-04-07 | 华能济南黄台发电有限公司 | State overhaul training device for EH control system of power plant |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108005736A (en) * | 2017-11-24 | 2018-05-08 | 胡莎 | The small machine high back pressure heating system of feed pump and device |
| CN108361081A (en) * | 2018-04-24 | 2018-08-03 | 长兴永能动力科技有限公司 | A kind of back pressure type centripetal turbine machine unloading protection equipment |
| CN108361081B (en) * | 2018-04-24 | 2023-10-27 | 国网浙江省电力有限公司龙游县供电公司 | Unloading protection device for back pressure type centripetal turbine |
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| CN112343543A (en) * | 2020-10-10 | 2021-02-09 | 中国石油集团渤海钻探工程有限公司 | Electro-hydraulic flat valve for fine pressure control drilling |
| CN115938185A (en) * | 2023-02-03 | 2023-04-07 | 华能济南黄台发电有限公司 | State overhaul training device for EH control system of power plant |
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