CN103256277B - A kind of Universal hydraulic station power-economizing method - Google Patents
A kind of Universal hydraulic station power-economizing method Download PDFInfo
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Abstract
The present invention relates to a kind of Universal hydraulic station power-economizing method, including working barrel, hydraulic energy-accumulating station, pressure sensing cell and ECU；Working barrel uses main pump and donkey pump duty, working barrel is in order to provide main flow and pressure to hydraulic actuator and hydraulic energy-accumulating station and to maintain system internal and outernal leakage necessary flow, wherein main pump is often to run, donkey pump is to use the signal of pressure sensing cell detection to control it by ECU to start or stop, pressure sensing cell sets multiple pressure parameter points, meets certain formula relationship between each pressure parameter point.It is that one can reach maximum energy-saving, the most fully ensure the reliability of Hydraulic Station, Hydraulic Station can also be made to have certain self-diagnostic function, Hydraulic Station flow or energy output have the Universal hydraulic station power-economizing method of higher power follower and adaptivity feature, effectively handle the harmony improved between Hydraulic Station capacity usage ratio and reliability well.Its maximum is characterised by using and produces the actual hydraulic pressure energy requirement in production life cycle as design considerations with system unit, fundamental difference in tradition with the peak power output of the external work done of hydraulic system as design considerations.
Description
Technical field
The present invention relates to a kind of General hydraulic station structure and power-economizing method thereof, this Hydraulic Station is applicable in addition to running type machine
The Energy Saving Technology by Hydraulic Pressure of all other weights industry, be one can wide variety of general-purpose energy-saving Hydraulic Station, be not only suitable for new
Increase the energy-saving design of Hydraulic Station, and be suitable for the reducing energy consumption of old Hydraulic Station.
Background technology
Existing hydraulic system, although be widely used such as constant pressure variable displacement pump, accumulator pressurize pump off-load zero load pressure
Power detects power-economizing methods such as restarting；But energy consumption is the highest, its effective utility of laser power is generally below 20%, and some is very
To below 5%.The basic reason that energy consumption is high is that hydraulic pump (motor) installed capacity is big, and empty load of motor energy consumption is high.
Onsite application data show, under meeting system pressure and flow premise, motor installed power often increases a meter
Amount unit, then system increases energy consumption newly is 28%～45% unit, and average increasing consumes about 35%, and its main cause is that Hydraulic Station uses
For non-high energy efficiency motor.
The contradiction of existing Hydraulic Station power-saving technology, embodies a concentrated reflection of and how to handle raising system capacity utilization rate and system well
The solution of reliability contradictory problems.The present invention is exactly the perfect best method solving this problem of energy, and it had both reached maximum energy-saving, again
Fully ensure the reliability of system, additionally it is possible to make system have certain self-diagnostic function, made flow system flow or energy output
Having higher power follower and adaptivity feature, this energy conserving system can be widely used on non-running type machine, tool
Have broad application prospects.The present invention uses innovative design concept: depend on hydraulic system external energy output demand for design
According to, abandon the conventional hydraulic station method with external peak power output as design considerations completely, therefore, it is the most energy-conservation setting
Meter method.
Existing patent: 200610050558.6 " power-economizing methods of stainless strip sulfuric acid refining continuous annealing production line hydraulic stations "
Open a kind of Hydraulic Station, this Hydraulic Station is only suitable for stainless strip sulfuric acid refining continuous annealing production line, and the scope of application is the least；Only be given
The empirical equation of particular rack, range is the most limited.
Additionally " hydraulic energy-saving motor " although patented technology energy-conservation, but it is not appropriate for system pressure stability requirement
The high reliability occasion that high, load flow changes in demand is big uses, therefore its range is actual is very limited, and it quickly rings
Answering property is seriously limited by system pressure drop, can only use, at some, the occasion that reliability and safety are the highest." hydraulic energy-saving
Motor " with the Energy Saving Technology by Hydraulic Pressure of existing " accumulator pressurize working barrel quit work pump while reducing (pressure) restart "
Comparing, hydraulic energy-saving is the most inconspicuous；Moreover, accumulator dwell time to be extended, the initiation culture of reduction pump, can be stored by increase
The installed capacity of energy device is solved easily, and this technology structurally exists obvious logicality mistake, it is difficult to have concrete
Use value.
Summary of the invention
The technical problem to be solved is to provide one can reach optimal for above-mentioned prior art present situation
Energy-conservation, the most fully ensure the reliability of Hydraulic Station, moreover it is possible to make Hydraulic Station have certain self-diagnostic function, Hydraulic Station flow or energy
Amount output has the Universal hydraulic station power-economizing method of higher power follower and adaptivity feature, effectively handles raising liquid well
Harmony between pressure station capacity usage ratio and reliability.
The present invention solves the technical scheme that above-mentioned technical problem used: a kind of Universal hydraulic station power-economizing method, including
Working barrel, hydraulic energy-accumulating station, pressure sensing cell and ECU；Working barrel uses main pump and donkey pump duty, working barrel
In order to provide main flow and pressure to hydraulic actuator and hydraulic energy-accumulating station and to maintain system internal and outernal leakage necessary flow, its
Middle main pump is often to run, and donkey pump is that the signal using pressure sensing cell detection controls its startup by ECU or stops
Only, it is characterised in that: the setting of pressure sensing cell multiple pressure parameter point is as follows,
PdThe lowest limit pressure that can normally work for system；
P0For system " low pressure " alarm pressure or the startup pressure of the second back work pump；
P1For controlling the pressure of back work pump startup；
P2For controlling the pressure that back work pump stops；
P3For system " low pressure " alarm pressure；
PzFor system normal design operating pressure；
PxInitial nitrogen charging pressure for accumulator；
Below equation relation is met between described each pressure parameter point,
Pd=0.4～0.6Pz；
P0=Pd+ 0.5～1.0Mpa；
P1=0.45 (P0+P2) and P1=P0+ 1.5～3.0MPa,
P2=1.3～1.5P1, usually need to meet P2=P1+ 3.0～10.0Mpa, if back work pump is by P2Touch
Send stopping, then P2=PZ-0.5Mpa；
P3=0.5 (P0+P1)；
Px=Pd。
Above-mentioned working barrel unit I includes: the main working barrel being made up of one or more parallel connection of pumps, and this main working barrel is in often
Use operating condition；The the first back work pump being made up of one or more parallel connection of pumps, the first back work pump is only at system stream
Amount and insufficient pressure, just automatically engage work when pressure sensing cell III is triggered, time delay certain time or work as system pressure and reach
To pressure sensing cell III set pressure time, the first back work pump is just automatically stopped；By one or more pump (preferably
Pump) the second back work pump of forming, have been started up and supplement to system flow and system pressure at the first back work pump still
In the case of so continuing to decline, the second back work pump starts automatically.According to actual needs, formation three can be combined between them
Plant typical energy conservation model, respectively: the first, Hydraulic Station working barrel is made up of main working barrel and the first back work pump
A+B operational mode, by P1、P2And P0Control the first back work pump；The second, this Hydraulic Station working barrel by main working barrel A,
The A+B+C operational mode of the first back work pump B and the second back work pump C composition, the function of the second back work pump is independent
Realized, i.e. by P by the second back work pump1、P2Control the first back work pump, only by P0Individually control the second back work
Pump；The third, this Hydraulic Station does not contains main working barrel A, the B+C being entirely made up of the first back work pump B and the second back work pump C
Operational mode, if Hydraulic Station starts first, the first back work pump must be by manually starting, now, the second back work pump
Allow automatically to participate in the startup first of Hydraulic Station but it also may select to be not involved in, when, after back work pump startup, pressure is gradually gone up
Rise, reach default pressure P2Time, it is automatically stopped after the first back work pump time delay a little, the second auxiliary after initial start-up
Working barrel also will be automatically stopped.
Above-mentioned main working barrel A can be provided with stand-by pump.
The driving motor of above-mentioned main working barrel A can be conventional motor, it is also possible to be partly or entirely Frequency Converter Control
Variable speed motor.Select conventional motor, equipment investment low cost, and select frequency conversion control technique can than the former more energy efficient 5～
15%.
Above-mentioned main working barrel A flow QMain=qNeed+qIn, qNeedFor hydraulic system in the unit unit product workpiece average period of production
Average discharge needed for external work done in T, for pressure BVO divided by the average period of production, i.e. qNeed=VAlways/ T, qInFor being
Unite internal leakage that may be present, VAlwaysFor total flow volume in the unit product average period of production；
Determine according to below table and formula
Above-mentioned leakage of hydraulic system flow qInDetermine by below equation and according to hydraulic actuator quantity n,
When n≤50, qIn=25L/Min.；
When 50 ＜ n≤100, qIn=60L/Min.；
When 100 ＜ n≤150, qIn=120L/Min.；
When 150 ＜ n≤260, qIn=150L/Min..
Above-mentioned hydraulic energy-accumulating station unit II is made up of pieces Large Copacity accumulator and adnexa thereof, and its installation total measurement (volume) is by Δ V
=2～8VAlwaysDetermine.
Compared with prior art, it is an advantage of the current invention that: this power-economizing method and existing patent: 200610050558.6
" power-economizing method of stainless strip sulfuric acid refining continuous annealing production line hydraulic stations " is compared, and has several important breakthrough, and difference is: 1,
The present invention intactly gives and realizes the brand-new design concept of this energy-saving hydraulic station and method: with load energy demand for setting at all
Meter foundation, has abandoned the tradition method for designing with maximum load power demand as foundation completely, has made energy saving of system efficiency be flown
Jump；2, the present invention can extensively be suitable for weight industrial hydraulic station (except walking machine), has greatly widened range；3, originally
Invention set forth in detail the relation between the various parameters realizing this energy-saving hydraulic station and computational methods thereof, and old invention only gives
Adapt to the empirical equation of particular rack, therefore, old invention range is the most limited；4, this technology is at the knot of the former energy-saving hydraulic station
Make further improvement on structure, increased certain system pressure self-diagnostic function newly, improve system reliability and maintainability；
Additionally this power-economizing method makes energy-conservation maximization, accumulator swept volume optimization and most reliable operating characteristic, and whole system has
Have fast response time, characteristic that safety redundant degree is high.
Accompanying drawing explanation
Fig. 1 is the structural representation of inventive embodiments；
Fig. 2 is the traffic characteristic curve chart in inventive embodiments in hydraulic system.
Detailed description of the invention
Below in conjunction with accompanying drawing embodiment, this utility model is described in further detail.
As it is shown in figure 1, be a preferred embodiment of the present invention.
A kind of Universal hydraulic station power-economizing method, including working barrel I, hydraulic energy-accumulating station II, pressure sensing cell III and automatically controlled
Unit IV；Working barrel I uses main pump and donkey pump duty, and working barrel I is in order to hydraulic actuator and hydraulic energy-accumulating station II
Thering is provided main flow and pressure and maintain system internal and outernal leakage necessary flow, wherein main pump is often to run, and donkey pump is for using pressure
The signal of power detector unit III detection controls it by ECU IV and starts or stops.
System electric-controlled unit IV is as present each Hydraulic Station, and ECU is essential, and it drives the opening of motor, stops
Loading or unloading function with pump are all realized it by its soft and hardware and control function.Especially, if main working barrel drives
Frequency conversion control technique selected by motor, needs to be carried out cooperating by pressure transducer.
In addition to above four big basic Component units, sometimes, also need to match other miscellaneous function list according to practical situation
Unit V: stand-by pump unit and circulating filtration (cooling) pump unit, but this unit is not the indispensable unit constituting hydraulic energy-saving pump,
The most no longer discuss.
Pressure sensing cell III is the element constituting this energy-saving hydraulic station, pressure contact switch or press
Force transducer forms, and usually, pressure switch must be formed by 1～4, or 1～2 pressure transducer PT composition, pressure detecting
The setting of more than III pressure parameter point of unit is as follows:
PdThe lowest limit pressure that can normally work for system；
P0For system " low pressure " alarm pressure or the startup pressure of the second back work pump, it is the second back work pump C
The control switch of self-starting, this switch is once triggered, then just can not be automatically stopped after the second back work pump C self-starting；
P1For controlling the pressure of the first back work pump startup；
P2For controlling the pressure that the first back work pump stops；
P3For system " low pressure " alarm pressure；
PzFor system normal design operating pressure；
PxInitial nitrogen charging pressure for accumulator；
PBecomeFor controlling the force value of converter；
Below equation relation is met between described each pressure parameter point,
Pd=0.4～0.6Pz；
P0=Pd+ 0.5～1.0Mpa；
P1=0.45 (P0+P2) and P1=P0+ 1.5～3.0MPa,
P2=1.3～1.5P1, usually need to meet P2=P1+ 3.0～10.0Mpa, if back work pump is by P2Touch
Send stopping, then P2=PZ-0.5Mpa；
P3=0.5 (P0+P1)；
Px=Pd。
Design parameter sets in accordance with the following steps:
First, it is first determined system lowest limit operating pressure Pd, it is desirable to this pressure must is fulfilled for whole hydraulic circuit energy
Normal work.
The second, system " low pressure " alarm pressure P is determined0, this pressure is also the startup pressure of the second back work pump, for
Make system stable and reliable in work, false alarm does not the most occur, selected P0=Pd+ 0.5～1.0MPa, the system for below 14MPa should
Choose less P0Value, should choose higher value for the hydraulic system higher than 14MPa, the highest P of system pressure0Value also should be the biggest.
3rd, the self-starting pressure P of system supplymentary working barrel is determined1, for improving system reliability and in view of auxiliary work
Make the startup of pump and be loaded with regular hour demand, by P1=0.45 (P0+P2) choose, typically must also meet P1=P0+
The relation of 1.5～3.0MPa, the system for below 14MPa should choose less P1Value, should for the hydraulic system higher than 14MPa
Choose higher value, the highest P of system pressure0Value also should be the biggest.
4th, the self-stopping technology pressure P of system supplymentary working barrel is determined2, for improving effective discharge efficiency of accumulator and being
The reliability of system work, chooses P2=1.3～1.5P1, usually need to meet P2=P1+ 3.0～10.0Mpa, without departing from being
In the case of system maximum pressure requires, take large values as far as possible；Usually, system worked well pressure is the highest, P2Value can be the highest.
If back work pump is by P2Trigger and stop, then P2=PZ-0.5Mpa, PZFor the maximum pressure of system worked well, also
It is the stability maintenance pressure of system.
5th, system worked well pressure PZDetermination, this pressure is system conventional operational pressure, i.e. system is the most externally done
Holding pressure during merit, that is, the normal design pressure of a hydraulic system, such as certain system design temperature are 13MPa, the most just
It is PZ=13MPa.
6th, accumulator nitrogen charging pressure PxDetermination, for playing the usefulness of accumulator as far as possible, it is ensured that system is in lowest limit
Pressure P0Under, the short time can also maintain system worked well by accumulator, choose Px=Pd。
7th, " low pressure alarming " parameter P3Determination, typically choose P3=0.45 (P0+P1) be preferred.
Working barrel I includes:
The main working barrel A being made up of one or more parallel connection of pumps, this main working barrel A are in conventional operating condition；Driving of pump
Galvanic electricity machine, both can be common electric machine, it is also possible to be the variable speed motor of Frequency Converter Control.Main working barrel A is in conventional operating
State, its function flows needed for providing main flow and pressure for hydraulic actuator and accumulator and maintain system internal and outernal leakage
Amount, main working barrel can be dosing pump, it is also possible to be variable pump；If selection dosing pump, then accumulator pressurize pump is used to unload
The energy conservation mode of lotus；And variable pump, general many employing constant pressure variable plunger pumps are more typically.In main working barrel, drive electricity
Machine both can be conventional motor, can be partly or entirely again the variable speed motor of VFC, selected conventional motor, and equipment is thrown
Enter low cost, and select frequency conversion control technique can than the former more energy efficient 5～15%, concrete condition can be selected according to the actual requirements
With.If selection frequency conversion motor, its motor minimum speed is not lower than the 1/5 of rated speed, is preferably controlled in rated speed 1/3 left
The right side, to increase the fast-response of main working barrel.
Usually, main working barrel can have the dedicated backup pump D of oneself, and back work pump is not necessarily with the backup list of oneself
Unit；Under many circumstances, for strengthening versatility, main working barrel, the first back work pump and the second back work pump are usually chosen
Identical model specification, can conveniently realize its conversion functionally by electric soft and hardware between them, greatly increase
The motility used.
In a word, no matter use what pump or motor, always require that main working barrel (motor) uses energy conservation mode.To master
For working barrel, select low discharge low power high-efficiency energy-saving electric pump as far as possible, drive empty load of motor and pump reducing it
Inside let out energy consumption；If selection frequency conversion motor, can suitably increase the rated output power of main working barrel.
The the first back work pump B being made up of one or more parallel connection of pumps, the first back work pump B is only at flow system flow
And insufficient pressure, just automatically engage work when pressure sensing cell III is triggered, time delay certain time or when system pressure reaches
When pressure sensing cell III sets pressure, the first back work pump B is just automatically stopped；Generally, it is desirable to donkey pump 90%
The above time is in halted state, only in flow system flow and insufficient pressure, when triggering pressure switch P1When being triggered just automatically
Devote oneself to work, time delay certain time or when system pressure reach pressure switch set pressure P2Time, back work pump stops the most automatically
Only.The benefit using delays time to control is to save a pressure switch, but uses pressure switch to control can more make us relieved,
Each helpful.The always just work when system external output flow because of the first back work pump B, so, the first back work pump B
The working barrel of relatively rated flow can be selected, and paced work pump and the phase asynchronous electricity of routine can also be selected for reducing investment outlay
Motivation.But sometimes, for increasing the versatility of equipment, often select major-minor working barrel same model specification, suitably sacrifice some energy
Consumption and early investment cost are the most worth.
By a second back work pump C formed, have been started up at the first back work pump B and supplement flow to system
And in the case of system pressure continues to decline, when pressure switch P0After being triggered, the second back work pump C starts automatically.
Generally, the second back work pump C does not starts.If because of certain reason, the first back work pump B have been started up and to
In the case of system supplements flow, system pressure continues to decline, and makes pressure switch P when dropping to0During triggering, the second auxiliary
Working barrel C starts automatically, and meanwhile, system sends " low pressure " of the forms such as word, acousto-optic or voice and reports to the police, afterwards, and not piping
System pressure is how, and the second back work pump C will run always, only after " low pressure " warning message is confirmed, and ability
By stopping the second back work pump manually, the second back work pump C once starts, and illustrates that system effectiveness and reliability are serious
Declining, there is hidden trouble in system, it is necessary to ascertains the reason as early as possible and process, and this pump is to maintain the last of system reliability to prevent together
Line, it is necessary to paid attention to, its existence has the biggest realistic meaning.
It should be noted that first, the second back work pump C function can be come real on same the first back work pump
Existing, when using the mode of operation of the first, it is also possible to the function of the second back work pump is attached to the first back work pump
On, when the first back work pump is because pressure switch P1When triggering and automatically start, then the first back work pump reaches time delay
Time or pressure switch P2When being triggered, the first back work pump can be automatically stopped, if pressure switch P0Also trigger and control
First back work pump, then will not be automatically stopped after the first back work pump startup, it is necessary in manual confirmation system " low pressure "
After alarm signal, could manually stop.In a word, by pressure switch P1Trigger the working barrel started, then can be by pressure switch P2Touch
The signal sent out stops or time delayed signal stops, if by pressure switch P0The signal triggered starts, then the second auxiliary work
Making pump must be by manually stopping.
Special instruction, several pressure switch setting values mentioned above can be come real in one or more pressure switches
Existing, it is also possible to be realized its function by a pressure transducer PT, specifically used can select according to the actual requirements, between them
Functionally there is no essential distinction, the most all pressure switch setting values mentioned, mean that this pressure is opened if there is no special statement
Closing, vice versa.
Back work pump is short because running the time, starts purpose and mainly supplements flow and pressure in time for system, optional
Relatively high power pump.Saying in a sense, back work pump can also regard system as at machine stand-by pump, or has stand-by pump
Function, but have essential distinction functionally with traditional stand-by pump, in this energy-saving hydraulic station, main working barrel can
There to be its dedicated backup pump unit, so, it is referred to as " auxiliary work pump " more suitable than address " stand-by pump ", in order to avoid misleading the public.
The selection principle of back work pump: usually, back work pump may select big flow working barrel, its flow and power
Output is greater than equal to main working barrel, and because back work pump operation time is comparatively short, and back work pump is externally constantly in defeated
Go out energy state, therefore, back work pump can not select the energy-conservation method of operation.But in more occasions, for strengthening the mutual of equipment
Transsexual, versatility and the disposable input of minimizing equipment, need suitably to sacrifice certain energy efficiency indexes, by main working barrel and auxiliary
Working barrel all selects the model of identical relatively high power, and all selects saving operation mode, and this is in the reducing energy consumption of old Hydraulic Station
In the most frequently used, usually retain its former working barrel, wherein will be converted into main working barrel by minority pump, and other major part working barrel converts
For back work pump or stand-by pump, it is not necessary to newly added equipment, not only decrease investment but also reached energy-conservation purpose.Back work pump
Startup time principle: be typically chosen No Load Start, load operating after running 3～5 seconds.
According to actual needs, three kinds of typical energy conservation models of formation can be combined between them, respectively:
1, the operational mode that Hydraulic Station working barrel is made up of main working barrel A and the first back work pump B, by P1、P2And P0Control
Make the first back work pump B；On the first back work pump A, it is also possible to part realizes the function of the second working barrel B, i.e. will appoint
The function of what first back work pump and the second back work pump combines, by P1、P2And P0Control same first
Back work pump, so, partly serves the function of the 2nd kind of operational mode.
2, the operation that Hydraulic Station working barrel is made up of main working barrel A, the first back work pump B and the second back work pump C
Pattern, the function of the second back work pump is individually realized, i.e. by P by the second back work pump1、P2Control the first back work
Pump, only by P0Individually control the second back work pump；
Aforementioned two kinds of mode of operations are suitable for requiring pressure stability field high, big and quickly response to flow changes in demand
Close, be can the mode of operation of blanket a kind of energy-saving hydraulic station, the difference of both patterns is, latter increases danger
Danger prompt functions and emergency power pump, contribute to production or equipment staff the most dynamically grasps the comprehensive of equipment
Can, the reliability of work improves further.
3, Hydraulic Station does not contains main working barrel A, the operation being entirely made up of the first back work pump B and the second back work pump C
Pattern, if Hydraulic Station starts first, the first back work pump must be by manually starting, and now, the second back work pump allows
Automatically the startup first of Hydraulic Station is participated in but it also may select to be not involved in；When, after back work pump startup, pressure is gradually increasing,
Reach default pressure P2Time, the first back work pump can be automatically stopped after time delay a little, the second auxiliary after initial start-up
Working barrel also will be automatically stopped.Afterwards, system will enter life's work state, its first back work pump and the second back work
The startup of pump is all identical with above two operational mode with stopping.When Hydraulic Station needs normally to quit work, it is also necessary to by people
Work forces to stop, and afterwards, manually starts instruction unless there are new, and the first back work pump B and the second back work pump C is by one
Directly being in stopped status, so, the control program of each working barrel enters a complete cycle period.
This mode of operation, has optimum energy-saving effect, is suitable for, unit product production week the highest at pressure stability requirements
The occasion that phase is longer, has, the advantage of simple in construction low to working barrel requirement.
Main working barrel often runs, by manually starting or stopping.If main working barrel drives motor to select VFC skill
Art, minimum speed when the most main working barrel runs is not lower than the 1/5 of rated speed, is preferably controlled in rated speed about 1/3,
To increase the fast-response of main working barrel, pressure during minimum rated rotating speed is system nominal pressure, when reaching rated speed
Pressure PBecome≥0.9P2, rotating speed therebetween is inversely proportional to system pressure.
The opening of first back work pump, stop entirely being automatically controlled by system；The startup of the second back work pump is automatic by system
Controlling, it stops by manually carrying out.But during main working barrel initial start-up, if allowing the second back work pump the most normally to start, then
The first stopping of the second back work pump is carried out automatically by system, this in the 3rd kind of mode of operation more typically.
Hydraulic Station shut down in the case of initial start-up time, main working barrel start while, due to P1Pressure switch detects
To the enabling signal of " pressure is low ", back work pump starts simultaneously.While main working barrel starts, although " low pressure " is reported to the police and opened
Close P0Trigger simultaneously, but do not send alarm signal, and the second back work pump does not the most start and (but have selected the 3rd kind of work
Except pattern)；" low pressure " alarm switch P3It is triggered, it is allowed to send word " low pressure " alarm signal simultaneously.
Reach normally to set pressure P when system pressure rises3Time, " low pressure " alarm signal is " reset " automatically；Work as system
Further rise in pressure reaches to set pressure P2Time, back work pump is automatically stopped, and main working barrel continues to run with, and makes system reach
Normal operating conditions.
Within certain working cycle, system external flow exports or because certain reason makes system pressure reduce to configuration switch P1
Pressure set-point time, back work pump starts automatically, load operating after running 3～5 seconds, supplements flow to system；If being
System pressure continues to be further decreased to P3During pressure set points, P3Pressure switch is triggered and sends " low pressure " alarm signal；Connect down
Come, if pressure is still further lowered into P0Value, then system sends " low pressure " alarm signal, and the second back work pump is same
Shi Qidong.Afterwards, it is assumed that pressure gradually recovers, P is first returned to0More than point pressure, but " low pressure " alarm signal is uncertainly
Dynamic reset, if further rise in pressure returns to P3More than signal, then P3" low pressure " alarm signal can automatically reset, it is possible to
Manually to reset, if pressure returns to P further2Time more than force value, then back work pump is automatically stopped, but the
Two back work pumps are not automatically stopped, it is necessary to by manual confirmation, and manually stop after " low pressure " alarm signal forced resetting
Only this working barrel.
When second back work pump C starts, the first back work pump B starts certainly the most automatically.
Main working barrel A, the first back work pump B and the second back work pump C can be conveniently by systems soft wares or hard
Part realizes function and the exchange of role between them, adds the motility that system uses, brings pole to operation and maintenance
Big convenient.
Main working barrel A flow QMain=qNeed+qIn, qNeedFor hydraulic system in unit unit product workpiece average period of production T
The externally average discharge needed for work done, for pressure BVO divided by the average period of production, i.e. qNeed=VAlways/ T, qInCan for system
The internal leakage that can exist, VAlwaysFor total flow volume in the unit product average period of production；
(r, n are natural number) is determined according to below table and formula
Leakage of hydraulic system flow qInDetermine by below equation and according to hydraulic actuator quantity n,
When n≤50, qIn=25L/Min.；
When 50 ＜ n≤100, qIn=60L/Min.；
When 100 ＜ n≤150, qIn=120L/Min.；
When 150 ＜ n≤260, qIn=150L/Min..
Hydraulic energy-accumulating station II is made up of pieces Large Copacity accumulator and adnexa thereof, and its installation total measurement (volume) is by Δ V=2～8VAlways
Determine, for the operational mode of first and second kind, take Δ V=3～5VAlwaysIt is preferred, for the third operational mode, takes Δ V=
5～8VAlwaysIt is preferred.
In modernization industrial production line, the traffic demand feature that hydraulic system is externally done work usually presents as shown in Figure 2
Periodic regularity, (figure only gives a complete working period schematic diagram), its marked feature is: the short time concentrate right
Outer acting big flow output demand, its time periodic segment is t peak and t paddy；In long-time a small amount of externally work done and maintenance system
The demand of leakage, its time periodic segment is t paddy；Complete cycle is T=t peak+t paddy；But different according to actual production demand, work
Make cycle T and also have large change, be averaged the cycle herein；For actual demand flow average in system cycle T,For in t peak
Average discharge demand, qmax. for peak-peak traffic demand in the working cycle.
Energy-saving effect is checked:
Certain Introduced from Japan Mitsubishi Heavy Industries Ltd 12 of producer roller stainless sheet steel finishing mill domestic, its coil of strip average period of production is
85 minutes.This milling train is original design has on high pressure the auxiliary hydraulic pressure drive system pushing away a set of sum of hydraulic control system a set of, wherein should
Milling train auxiliary hydraulic pressure drive system synteny has 127 oil cylinders and 2 hydraulic motors, and hydraulic pressure station owner's working barrel is provided with 6, and normally opened 5
Platform, standby 1, main working barrel is constant pressure variable plunger pump, and the minimum service pressure of system is 7.0MPa, the normal work of design
Pressure is 14.0MPa, and every drives motor rated power is 75KW.This milling train is only 2 hydraulic motors under normal rolling operating mode
Operate the traffic demand of about 20L/Min, and the total internal leakage of actual measurement system is 26L/Min, and lower 5 the main working barrel total currents of this operating mode are
375A；Time under the non-as-rolled condition of upper and lower coil of strip, unit coils produces gross pressure oil demand about 180L, and this time produces for auxiliary
Time, average time is 10 minutes.
Research finds, under as-rolled condition, and this auxiliary hydraulic pressure station actual power about 200KW, and be computed drawing theoretical need
Seek power only 11KW, differ huge between the two, illustrate that this Hydraulic Station capacity usage ratio is the lowest.We are averagely produced week by coil of strip
Phase calculates, and in the unit coils production cycle, actual consumption is: 265KW H, is computed theoretical energy consumption only 15.8KW H, energy
Utilization rate only 5.96%.Analysis shows, the basic reason that energy consumption is high is excessive in the installed capacity of motor, and no-load power consumption height causes
's.
For this unit high energy consumption feature, we take the novel design method with energy requirement as design considerations, i.e.
In this coil of strip average period of production theory demands energy be 15.8KW H be design considerations, make following improvement:
First, selected former main working barrel 1# pump is the main working barrel of new improvement, and regulating the specified output flow of this working barrel is
105L/Min, replaces the old motor of former 75KW with 30KW new motor, and as new, main for former 2# working barrel is improved the standby of main working barrel
With pump, in place of change, working barrel main with former 1# is identical, and the main working barrel of former 3#, 4# and the parameter of electric machine are constant, but use instead by pressing
Power switch controls it and starts or stops, under conditions of new 1# (or new 2#) main working barrel starts, when system pressure is less than
During 9.0MPa, 3# working barrel starts automatically, and when system pressure reaches 13.5MPa, 3# working barrel is automatically stopped, 3# pump respectively by
Newly-increased pressure switch P1、P2Control；The main working barrel of 4# should be by newly-increased pressure switch P0Control, set pressure as 7.5MPa, when
When this pressure switch is triggered, this 4# pump starts automatically, and simultaneity factor sends " low pressure " sound and light alarm signal, points out work people
There is bigger problem in member's system.Secondly, 1, the hydraulic energy-accumulating station that this system original tape has capacity to be 120L × 2, store up for energization
Depositing, newly-increased capacity is one, the accumulation of energy station of 120L × 6, and system worked well pressure is that 7.5MPa is constant, and initial nitrogen charging pressure is
7.0MPa。
After above improvement, this system run all right is reliable, it is achieved the trouble-free good record up to 36 months.This hydraulic pressure
Original-assemblied machine capacity of standing is 375KW, and under former actual as-rolled condition, energy consumption is 200KW, the installed capacity that after improvement, actual participation runs
For 30KW, actual consumption power is 17.5KW, calculates by 70 minutes production of units cycles, fractional energy savings about 90%.
Claims (3)
1. a Universal hydraulic station power-economizing method, including working barrel (I), hydraulic energy-accumulating station (II), pressure sensing cell (III) and
ECU (IV)；Described working barrel (I) uses main pump and donkey pump duty, and working barrel (I) is in order to hydraulic actuator
Thering is provided main flow and pressure with hydraulic energy-accumulating station (II) and maintain system internal and outernal leakage necessary flow, wherein main pump is Chang Yun
OK, donkey pump is to use pressure sensing cell (III) signal that detects to control it by ECU (IV) to start or stop, its
It is characterised by: the setting of described pressure sensing cell (III) multiple pressure parameter point is as follows,
PdThe lowest limit pressure that can normally work for system；
P0For system " low pressure " alarm pressure or the startup pressure of the second back work pump；
P1For controlling the pressure of the first back work pump startup；
P2For controlling the pressure that the first back work pump stops；
P3For system " low pressure " alarm pressure；
PzFor system normal design operating pressure；
PxInitial nitrogen charging pressure for accumulator；
Below equation relation is met between described each pressure parameter point,
Pd=0.4～0.6Pz；
P0=Pd+ 0.5～1.0Mpa；
P1=0.45 (P0+P2) and P1=P0+ 1.5～3.0MPa,
P2=1.3～1.5P1, meanwhile, P2=P1+ 3.0～10.0Mpa, meanwhile, P2=PZ-0.5Mpa；
P3=0.5 (P0+P1)；
Px=Pd；
Described working barrel (I) including: the main working barrel (A) being made up of one or more parallel connection of pumps, and this main working barrel (A) is in often
Use operating condition；The the first back work pump (B) being made up of one or more parallel connection of pumps, the first back work pump (B) only exists
Flow system flow and insufficient pressure, pressure sensing cell (III) just automatically engages work when being triggered, time delay certain time is maybe when being
When system pressure reaches pressure sensing cell (III) setting pressure, the first back work pump (B) is just automatically stopped；By one or more
Second back work pump (C) of parallel connection of pumps composition, has been started up at the first back work pump (B) and supplements flow to system and be
In the case of system pressure continues to decline, when pressure sensing cell (III) is triggered, the second back work pump (C) opens automatically
Dynamic, stop by stopping manually；
According to actual needs, three kinds of typical energy conservation models of formation can be combined between them, respectively:
The operational mode that Hydraulic Station working barrel is made up of main working barrel (A) and the first back work pump (B), by P1、P2And P0Control
First back work pump (B)；
The operation that Hydraulic Station working barrel is made up of main working barrel (A), the first back work pump (B) and the second back work pump (C)
Pattern, the function of the second back work pump is individually realized, i.e. by P by the second back work pump1、P2Control the first back work
Pump, only by P0Individually control the second back work pump；
Hydraulic Station does not contains main working barrel (A), the operation being entirely made up of the first back work pump (B) and the second back work pump (C)
Pattern, if Hydraulic Station starts first, the first back work pump must be by manually starting, and now, the second back work pump allows
Automatically the startup first of Hydraulic Station is participated in but it also may select to be not involved in；When, after back work pump startup, pressure is gradually increasing,
Reach default pressure P2Time, it is automatically stopped after the first back work pump time delay a little, the second back work after initial start-up
Pump also will be automatically stopped.
Universal hydraulic station power-economizing method the most according to claim 1, it is characterised in that: described main working barrel (A) flow QMain
=qNeed+qIn, qNeedFor hydraulic system average discharge needed for external work done in unit unit product workpiece average period of production T,
For pressure BVO divided by the average period of production, i.e. qNeed=VAlways/ T, qInFor system internal leakage that may be present flow, VAlwaysFor
Total flow volume in the unit product average period of production.
Universal hydraulic station power-economizing method the most according to claim 2, it is characterised in that: described qInBy below equation and according to
Hydraulic actuator quantity n determines,
When n≤50, qIn=25L/Min.；
When 50 ＜ n≤100, qIn=60L/Min.；
When 100 ＜ n≤150, qIn=120L/Min.；
When 150 ＜ n≤260, qIn=150L/Min..
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| CN104747541A (en) * | 2015-03-24 | 2015-07-01 | 上海大学 | Hydraulic power station of grouting pump |
| CN107575438B (en) * | 2017-08-11 | 2019-06-07 | 江苏永钢集团有限公司 | A kind of online energy conserving system of two independent hydraulic stations |
| CN109253118A (en) * | 2018-10-29 | 2019-01-22 | 北京航天发射技术研究所 | A kind of automatic switchover constant pressure oil source device based on pressure judgement |
| CN109296918A (en) * | 2018-11-08 | 2019-02-01 | 四川川润液压润滑设备有限公司 | A kind of bi-motor determines number control method for automatically switching |
| CN112835391B (en) * | 2020-12-30 | 2022-08-19 | 中国长江电力股份有限公司 | Intelligent control method for pressure maintenance system |
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| CN2928293Y (en) * | 2006-06-23 | 2007-08-01 | 宁波宝新不锈钢有限公司 | Energy saving hydraulic station for stainless steel pulling straightening and rewinding producing line |
| CN200946159Y (en) * | 2006-06-23 | 2007-09-12 | 宁波宝新不锈钢有限公司 | Energy-saving hydraulic station adapted for stainless steel polishing production line |
| CN101063208A (en) * | 2006-04-28 | 2007-10-31 | 宁波宝新不锈钢有限公司 | Energy-saving method for stainless strip sulfuric acid refining continuous annealing production line hydraulic stations |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101063208A (en) * | 2006-04-28 | 2007-10-31 | 宁波宝新不锈钢有限公司 | Energy-saving method for stainless strip sulfuric acid refining continuous annealing production line hydraulic stations |
| CN2928293Y (en) * | 2006-06-23 | 2007-08-01 | 宁波宝新不锈钢有限公司 | Energy saving hydraulic station for stainless steel pulling straightening and rewinding producing line |
| CN200946159Y (en) * | 2006-06-23 | 2007-09-12 | 宁波宝新不锈钢有限公司 | Energy-saving hydraulic station adapted for stainless steel polishing production line |
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Effective date of registration: 20180411 Address after: Pudong New Area Xinchang Town xintanwa highway 201314 in Shanghai City, No. 929 Room 201 No. 1 Patentee after: Shanghai ACC Hydrau Technology Co.,Ltd. Address before: 315807, room 3, building 304, Li Ren garden, Ningbo, Zhejiang, Beilun Patentee before: He Rongzhi |
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