CN1128090C - Energy-storing power economizer for varying frequency driven hydraulic elevator - Google Patents
Energy-storing power economizer for varying frequency driven hydraulic elevator Download PDFInfo
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Abstract
The present invention discloses an energy-saving device for driving a hydraulic elevator by frequency conversion via an energy accumulator, and an energy accumulator loop and an energy accumulator oil feed loop are respectively added in a main loop and a load loop of a device for conventionally driving the hydraulic elevator by frequency conversion. A pressure-energy converter is jointly composed of a main loop electric motor, a large pump/ motor and energy accumulator loop and a small pump/motor and energy accumulator. When the elevator upwards runs, pressure energy stored by the energy accumulator is converted into mechanical energy and is used on an electric motor shaft of the main loop, and the mechanical energy provides secondary moment. When the elevator downwards runs, the potential energy and the kinetic energy of the elevator are converted into mechanical energy and are converted into pressure energy, and then the pressure energy is stored in the energy accumulator. Therefore, the present invention realizes the mutual conversion and storage of energy flow and reduces the output torque of the electric motor.
Description
Technical field
The present invention relates to the programme controlled device of hydraulic pressure, is a kind of energy saver that adopts the variable frequency hydraulic elevator of energy storage.
Background technology
Produce now from hydraulic elevator, experienced the development course of valve control hydraulic efficiency pressure system to the variable frequency control hydraulic efficiency pressure system.Valve control hydraulic elevator is to use the most ripe hydraulic elevator now, and it mainly is to use the running velocity that throttling governing technology in the hydraulic technique is come the modulated pressure elevator.Its maximum advantage is exactly that system is succinct, and control is convenient, but shortcoming is obvious: adopt throttling governing system excess flow loss bigger, particularly the descending whole potential energy of elevator all are lost in throttle orifice, cause system effectiveness lower, and the fluid temperature rise is very fast; Cause to use when frequently moving expensive cooling system to suppress the rising of temperature; And the rising of oil temperature also makes and the speed control unstable properties of elevator must adopt the control method of more complicated to obtain good controller performance.
The hydraulic elevator of conventional frequency conversion drive is by adopting the variable voltage variable frequency technology to control the rotating speed of three-phase AC asynchronous motor, thereby the output/input flow rate of control quantitative hydraulic pump/motor, reach according to certain rules the modulated pressure cylinder jacking car running velocity that makes progress, perhaps control the purpose of car downstream rate.
As shown in Figure 1, Chang Gui variable frequency hydraulic elevator simple working principle is as follows:
1) up
After receiving the up calling signal in stop or the sedan-chair, computer controlled detects controller 11 and sends two paths of signals, and one the tunnel is the pwm signal 16 of control frequency converter; One the tunnel is the positive veer signal 17 of motor; The alternating current 21 that frequency converter 1 produces corresponding frequencies and voltage according to the control signal 16 of input drives asynchronous motors 3 and drives pump/motors 2 rotation pressure oil output, 14 check valves that back down in the electromagnetic valve 7 by the road, thus promote upwards operation of car; Before elevator starter, by pressure sensor 12 major loop pressure, deliver to computer controlled detecting unit 11 by signal wire (SW) 19, compare with the value of setting of being scheduled in the software, determine to load the moment of ideal speed curve.Simultaneously, the photoelectric encoder 4 of motor reel side detects rotating speed of motor and tach signal is fed back to frequency converter, constitutes closed-loop vector control.When elevator pulled in, computer controlled detecting unit 11 sent stop signal for frequency converter 1, and motor 3 rotating speeds reduce to zero, and the delivery pressure of pump/motor 2 also reduces rapidly, leaned on the deadweight of car 10 that the check valve in the electromagnetic valve 7 is turn-offed, and elevator stops.If major loop pressure surpasses the value of setting of safety valve 9, the pressure oil of then big pump/motor output is by pipeline 15, safety valve 9 bypass oil sump tanks 43.
2) descending
After receiving the descending calling signal in stop or the sedan-chair, computer controlled detecting unit 11 is at first exported control signal 17 and is made frequency converter driving motor 3 forward low-speed runnings, give system's repairing, pump/motor 2 export pipelines 14,15 pressure are raise rapidly, when the delivery pressure that detects pump/motor 2 when pressure sensor 12 reaches setting value, computer controlled detecting unit 11 sends three road signals, and one the tunnel is the electromagnet energising of control electromagnetic valve 7, and electromagnetic valve 7 is opened; One the tunnel is the hand of rotation signal 17 of electrical motor, drives asynchronous motor 3 and carries out the transition to antiport from the forward low-speed running; One the tunnel is the pwm signal 16 of control frequency converter 1, frequency converter 1 provides corresponding lock torque to control the speed that plunger descends according to the control signal 16 of input to electrical motor 3, this moment, motor changed the operation of electrical generator state into by electric motor state, and the energy that is produced returns the electrical network (not shown) through the regenerative braking unit; When elevator pulled in, computer controlled detecting unit 11 made electromagnetic valve 7 electromagnet outages, and electromagnetic valve 7 is closed, for avoiding impacting, during frequency converter 1 drive electrical motor 3 low speed and reverses, wait that car 10 is complete to allow frequency converter 1 stop when slack; In electrical motor 3 Umklapp processes pump/motor 2 through check valve 8, pipeline 25 and pipeline 15 from fuel tank 43 oil suction to keep on the go.
In car 10 upper and lower operational processs, the photoelectric code disk 24 of car speed signal on car 10 detects, and feeds back to computer controlled detecting unit 11 in real time by signal wire (SW) 22 and notes, and be presented in real time on the computer screen, for experimental analysis.Simultaneously the velocity feedback of car also can constitute car speed and feeds back big closed loop car speed is controlled.
As a kind of variable speed volumetric speed control mode, thereby frequency control can provide flow that the loss of system's overflow is dropped to bottom line by the needs of system, compare with valve control hydraulic elevator system, no matter how load changes this frequency conversion drive volumetric speed control hydraulic elevator system, horsepower input can both adapt to the variation of loading demand, therefore can reduce hydraulic elevator uplink and downlink energy consumption significantly, improve the efficient of system, the temperature rise of system is reduced significantly.
Selection of components also must be selected by the maximum consumption of power principle in the same frequency conversion drive volumetric speed control hydraulic elevator system with valve control system, be exactly under the prerequisite of same design parameter, frequency conversion drive speed control system with adjustable displacement power demand element is consistent with the ultimate bearing capacity of valve control system power demand element, and promptly it can not reduce system's installed power; And more high-performance frequency converter costs an arm and a leg in the production application at present, because less in batches, this just makes standard frequency conversion (VVVF) hydraulic control system cost higher.Adopt hydraulic elevator electrical motor 3 in descending process of frequency conversion drive to do electrical generator generation electric energy in addition, this moment is if will then must reach relevant filtering with an inverter to reach purpose of energy saving with the electric energy feedback grid that produces, rectifying circuit constitutes feedback circuit, like this, one has increased system again constitutes cost, two come the electric energy quality of feedback to depend on feedback circuit, the raising of quality means the increase of feedback circuit complexity and cost, the descending energy recovery of elevator is the key that reduces variable frequency control hydraulic elevator energy consumption, if can not finely solve, though then variable frequency control hydraulic elevator energy consumption is littler than valve control system, but compare with towed elevator, still bigger.
Summary of the invention
The objective of the invention is to: the energy saver that adopts the variable frequency hydraulic elevator of energy storage, can solve the descending energy recovery of variable frequency hydraulic elevator in the background technology field, and discharge in the ascending for elevator process, can reduce the energy consumption and the installed power of hydraulic elevator.
In order to achieve the above object, the technical solution used in the present invention is as follows:
It comprises the AC vector frequency converter, big pump/motor, AC asynchronous motor, the photoelectric encoder of motor shaft side, plunger case and plunger, major loop electromagnetic valve, anti-empty check valve, major loop by pass valve, the lift car inhaled of major loop, the control detection unit, pressure sensor, the photoelectric encoder that tests the speed on the car, hoistway and guide rail, AC asynchronous motor is connected with coupler with big pump/motor, more than common major loop and the load circuit of forming of all parts.It also comprises little pump/motor, anti-empty check valve, the subsidiary loop electromagnetic valve inhaled of subsidiary loop, bag type accumulator, repairing AC asynchronous motor, slippage pump, the anti-check valve that pours in down a chimney of feed circuit, auxiliary accumulator loop and the energy storage feed circuit of forming with the feed circuit by pass valve; Little pump/motor is connected with coupler with AC asynchronous motor; little pump/motor oil outlet tap two-way; the one tunnel connects the empty check valve of the anti-suction of subsidiary loop; another road connects bag type accumulator through the subsidiary loop electromagnetic valve; auxiliary and feed circuit by pass valve one tunnel prevents that through feed circuit pouring in down a chimney check valve connects slippage pump; another road connects bag type accumulator, and the computer controlled detecting unit connects the subsidiary loop electromagnetic valve through control signal wire.
Advantage of the present invention is: it constitutes pressure one energy conversion device jointly by major loop electrical motor, big pump/motor and the little pump/motor of accumulator loop and energy storage.When lift car is up, the pressure that stores in the energy storage can be converted to mechanical energy by little pump/motor provides additional moment for the axle of major loop electrical motor or big pump/motor; And when lift car is descending, car potential energy and kinetic energy are converted to mechanical energy by big pump/motor, by little pump/motor mechanical energy being converted to pressure again can be stored in the energy storage, thereby realizes the mutual conversion and the storage of energy stream, has reduced the output torque of electrical motor.The present invention not only has frequency changing driving system efficient height, the advantage of less energy consumption, but also reduced the installed power of hydraulic elevator significantly.
Description of drawings
Fig. 1 is conventional variable frequency hydraulic lift appliance schematic diagram;
Fig. 2 is for adopting the variable frequency hydraulic energy-saving device of elevator schematic diagram of energy storage.
The specific embodiment
The invention will be further described below in conjunction with accompanying drawing.
As shown in Figure 2, it comprises AC vector frequency converter 1, big pump/motor 2, AC asynchronous motor 3, the photoelectric encoder 4 of motor shaft side, plunger case and plunger 5,6, major loop electromagnetic valve 7, the empty check valve 8 of the anti-suction of major loop, major loop by pass valve 9, lift car 10, computer controlled detecting unit 11, pressure sensor 12, the photoelectric encoder 23 that tests the speed on the car, hoistway and guide rail 24, AC asynchronous motor 3 is connected with big pump/motor 2 usefulness coupler 26, more than all parts major loop and the load circuit of composition jointly.It also comprises little pump/motor 27, the empty check valve 28 of the anti-suction of subsidiary loop, subsidiary loop electromagnetic valve 29, bag type accumulator 30, repairing AC asynchronous motor 36, slippage pump 37, the anti-check valve 38 that pours in down a chimney of feed circuit, auxiliary accumulator loop and the energy storage feed circuit of forming with feed circuit by pass valve 39; Little pump/motor 27 is connected with AC asynchronous motor 3 usefulness coupler 42; little pump/motor 27 oil outlet tap two-way; the one tunnel connects the empty check valve 28 of the anti-suction of subsidiary loop; another road connects bag type accumulator 30 through subsidiary loop electromagnetic valve 29; auxiliary and feed circuit by pass valve 39 one tunnel prevents that through feed circuit pouring in down a chimney check valve 38 connects slippage pump 37; another road connects bag type accumulator 30, and computer controlled detecting unit 11 connects subsidiary loop electromagnetic valve 29 through control signal wire 31.
Major loop electrical motor 3, big pump/motor 2 and the little pump/motor 27 of accumulator loop and energy storage 30 common formation pressure-energy conversion devices.In the whole service process, play the function served as bridge of a transfer of energy; In the up process of lift car, it can be converted to mechanical energy by little pump/motor 27 with the pressure that stores in the energy storage and provide additional moment for the axle of major loop electrical motor 3 or big pump/motor 2; And when descending, it is converted to mechanical energy with car potential energy and kinetic energy by big pump/motor 2, by little pump/motor 27 mechanical energy is converted to pressure again and can be stored in the energy storage 30, thereby realize mutual conversion and the storage that energy flows, reach energy-conservation and realize the purpose that installed power reduces.
Divide two operating modes of uplink and downlink to be described in detail the principle of the variable frequency hydraulic elevator energy-saving control system of band energy storage below; Because the inherent characteristic of bag type accumulator work, we also will focus on the influence (narration before, we suppose electrical motor forward rotation corresponding ascending for elevator, otherwise corresponding elevator descending) of elevator load situation to native system real-world operation state.Up process
After receiving the up calling signal in stop or the sedan-chair, computer controlled detecting unit 11 sends three road signals, and one the tunnel is the pwm signal 16 of control frequency converter; One the tunnel is the turn sign 17 of motor; Another road is the on-off signal 31 of control electromagnetic valve 29; Frequency converter 1 is made big pump according to the ac signal 21 driving asynchronous motors 3 output torques drive pump/motor 2 of control signal 16 generation corresponding frequencies of importing and voltage and is rotated in the forward pressure oil output in the major loop, 14 check valves that back down in the electromagnetic valve 7 upwards move thereby promote car 10 by the road; Before elevator starter, measure major loop pressure by pressure sensor 12, deliver to computer controlled detecting unit 11 by signal wire (SW) 19, compare with the value of setting of being scheduled in the software, determine to load the moment of ideal speed curve.The electromagnet of the electromagnetic valve 29 of accumulator loop energising simultaneously, electromagnetic valve 29 is opened, pressure oil liquid in the energy storage 30 enters the little pump/motor 27 of little pump/motor 27 promotions by pipeline 32,33,35 and does the motor rotation, the pressure in the energy storage 30 can be converted into the additional drives moment that acts on electrical motor 3 or big pump/motor 2 S. A.s overcome load circuit resisting moment driving ascending for elevator jointly.In the whole service process, the photoelectric encoder 4 of 3 sides of electrical motor detects the rotating speed of electrical motor 3 and tach signal 20 is fed back to frequency converter 1, compare with desirable velocity curve, by the software algorithm in the computer control unit 11, assurance elevator running velocity curve is accurately followed the tracks of ideal curve, constitute closed-loop vector control, reach the effect of comfortable operation.Photoelectric encoder 23 on the car detects elevator real-world operation speed, feeds back to computer controlled detecting unit 11 in real time and notes, and be presented in real time on the computer screen, for experimental analysis or participation control.When the deceleration point signal triggering in the hoistway, frequency converter 1 control motor 4 increases braking torque gradually, and when making electrical motor 4 with a certain less invariablenes turning speed, elevator enters the flat bed section;
When car 10 when stopping stop, dry reed switch in the hoistway provides danger signal, computer control unit 11 sends stop signal for frequency converter 1, make the outage of electromagnetic valve 29 electromagnet simultaneously, electromagnetic valve 29 is closed, and electrical motor 3 rotating speeds reduce to zero, and the delivery pressure of big pump/motor 2 also reduces rapidly, deadweight by car 10 is turn-offed the check valve in the electromagnetic valve 7, and elevator stops.If major loop pressure surpasses the value of setting of safety valve 9, the pressure oil of then big pump/motor output is by pipeline 15,25, safety valve 9 bypass oil sump tanks 43.
In whole up process, energy storage 30 all is in the stage of releasing energy, fluid discharge, air bag cubic expansion, energy storage internal pressure constantly descend, therefore it also constantly changes to the additional drives moment that electrical motor 3 or big pump/motor 2 S. A.s are provided by little pump/motor 27 thereupon, and this is that the intrinsic operating characteristic of energy storage determines; (because the difference of load, the resisting moment of load circuit is also different), focus in two kinds of situation here because the variation of different electrical motors torque in whole up process of load: (1): underloading (containing zero load) is up
The oil liquid pressure that stores in the energy storage 30 when just starting is the highest, its additional drives moment in the generation that rotation shaft side transforms of electrical motor 3 or big pump/motor 2 is also maximum, this moment is if car 10 is a underloading, the additional drives moment that accumulator loop provides is big than the load circuit resisting moment, impact for avoiding ascending for elevator to start, therefore when light-load starting, electrical motor 3 must provide the resisting moment of load circuit and the torque difference between the accumulator loop additional drives moment as braking torque under frequency converter 1 control, make car static, and then reduce braking torque gradually, it is up by desirable velocity curve to make pump/motor 2 promote car 10 as pumping function positive dirction rotation output hydraulic oil.Along with the up accumulator loop pressure of car 10 constantly reduces, the additional drives moment that it can provide also constantly reduces, and electrical motor 3 is subjected to frequency converter 1 control to provide the Electromagnetic Drive torque to promote car 10 jointly by desirable curve motion when additional drives moment has been not enough to promote car 10 by desirable curve motion.(2): heavy duty is up
Compare because car 10 is full load with underloading is up, the resisting moment of load circuit is bigger, therefore the torque difference between load circuit and the accumulator loop is less when just starting, the required braking torque that provides is also corresponding reduces for electrical motor 3, compare with the up startup of underloading, the dynamic and static performance of heavily loaded up startup makes moderate progress.Up along with car 10, electrical motor 3 is subjected to frequency converter 1 control to provide the Electromagnetic Drive torque to promote car jointly by desirable curve motion.When elevator moved on the high building course, this moment, accumulator loop pressure was lower, and the additional drives moment that it can provide is relatively little, and load circuit is in big resisting moment state, and the required Electromagnetic Drive moment that provides of electrical motor is bigger; Particularly when elevator operation during near the top, in this moment energy storage pressure near minimum operating pressure, the additional drives moment minimum that it can provide, then electrical motor 3 needs provide the drive torque of maximum under the control of frequency converter 1.Electrical motor 3 is in the state of operating at full capacity this moment.Descending process
Descending more up process is more complicated: oil liquid pressure reduces in the pipeline 14,15 because the internal leakage of big pump/motor 2 causes, it is special when wait time is longer, oil liquid pressure even low in the pipeline 14,15 to tank pressure, and oil liquid pressure is a load pressure in the pipeline 13, consider the factors such as compressibi1ity of fluid simultaneously, this moment is if still take and up same control policy, then can produce downward impact because of the difference of pressure at electromagnetic valve 7 two ends when moment lift car that electromagnetic valve 7 is opened when descending the startup.Therefore produce downward impact when avoiding descending startups, behind the descending calling signal of system in receiving stop or sedan-chair, computer controlled detecting unit 11 sends the positive rotaring signal 17 of electrical motor 3 low speed earlier, electrical motor 3 low speed just change, big pump/motor 2 is done pump operating mode pressure oil output, and check valve 28 is used for guaranteeing that accumulator loop pump/motor 27 can not inhale sky when electrical motor 3 is just changeing; The pressure of pressure sensor 12 real-time signal pipings 14 also feeds back to computer controlled detecting unit 11, after the pressure for the treatment of pipeline 14 reaches the equilibrium point that Control Software sets, computer controlled detecting unit 11 is closed the positive rotaring signal of electrical motor, send the signal 18 of opening electromagnetic valve 7, because shock damping action, this valve is slowly opened; Simultaneous computer control detection unit 11 sends the pwm signal 16 and the electrical motor backward rotation signal 17 of control frequency converter, makes electrical motor 3 backward rotation, and elevator is descending; In the whole service process, the pressure oil of load circuit enters the big pump/motor 2 of big pump/motor 2 promotions by pipeline 13,14 and does the motor operating mode, the pressure of load circuit can be converted into the additional drives moment that acts on electrical motor 3 or little pump/motor 27 S. A.s, and little pump/motor 27 is done the pump operating mode under the common driving of big pump/motor 2 and electrical motor 3, charged pressure oil in energy storage 30, the descending energy of storage elevator; The photoelectric encoder 4 of 3 sides of electrical motor detects the rotating speed of electrical motor 3 and tach signal 20 is fed back to frequency converter 1 simultaneously, compare with desirable velocity curve, by the software algorithm in the computer controlled detecting unit 11, assurance elevator running velocity curve is accurately followed the tracks of ideal curve, constitute closed-loop vector control, reach the effect of comfortable operation.When the deceleration point signal triggering in the hoistway, frequency converter 1 control motor 3 increases braking torque gradually, and when making electrical motor 3 with a certain less invariablenes turning speed, elevator enters the flat bed section; When car 10 when stopping stop, dry reed switch in the hoistway provides danger signal, computer control unit 11 sends stop signal for frequency converter 1, make the outage of electromagnetic valve 7 electromagnet simultaneously, electromagnetic valve 7 is closed, and electrical motor 3 rotating speeds reduce to zero, and the delivery pressure of little pump/motor 27 reduces rapidly, the difference of pressure at electromagnetic valve 29 two ends makes it to close, and elevator stops.The purpose that check valve 28 is set is to produce emptying phenomenon when preventing little pump/motor low speed rotation, can pass through fuel tank 43, check valve 27, and pipeline 34 oil suctions enter the mouth to little pump/motor.Being provided with of safety valve 39 can be when the subsidiary loop hypertonia, and the fluid of energy storage is by pipeline 40, safety valve 39 oil sump tanks.
In whole descending process, energy storage 30 all is in the stored energy stage; Fluid enters energy storage, gas in the compressing gasbag, and pressure raises, so it also constantly changes to the resisting moment that electrical motor 3 or big pump/motor 2 S. A.s are provided by little pump/motor 27 thereupon; Similar with the upstream analyzing process, herein also according to the split-phase motor 3 torques variation in two kinds of situation of load difference: (1): heavy duty is descending
The oil liquid pressure that stores in the energy storage 30 when just starting is minimum, its resisting moment in the generation that rotation shaft side transforms of electrical motor 3 or big pump/motor 2 is also minimum, and this moment, car was fully loaded, the additional drives moment that load circuit provides is relatively large, therefore when the descending process of heavy duty has just started, for avoiding the descending overshoot of elevator, electrical motor 3 must provide the resisting moment of accumulator loop and the torque difference between the load circuit additional drives moment as braking torque under frequency converter 1 control, make car static, and then reduce braking torque gradually, make big pump/motor 2 make car 10 descending by desirable velocity curve as motor function counter-rotation input hydraulic pressure oil.Along with the descending accumulator loop pressure of car 10 constantly raises, the resisting moment that it provided also constantly increases, the additional drives moment that provides when load circuit deficiency so that car 10 during by desirable curve motion electrical motor 3 be subjected to frequency converter 1 control to provide the Electromagnetic Drive torque to promote car 10 jointly by desirable curve motion.(2): underloading (containing zero load) is descending
With fully loaded descending comparing because car 10 is zero load, the additional drives moment of load circuit is less, therefore the torque difference between load circuit and the accumulator loop is less when descending process has just started, the required braking torque that provides is also corresponding reduces for electrical motor 3, compare with the descending startup of heavy duty, the dynamic and static performance of the descending startup of underloading makes moderate progress.
Descending along with car 10, electrical motor 3 is subjected to frequency converter 1 control to provide the Electromagnetic Drive torque to promote car jointly by desirable curve motion.When elevator moved under the lowrise course, this moment, accumulator loop pressure was higher, and the resisting moment that it provided is relatively large, and load circuit is a underloading, and the additional drives moment that is provided is less, and the electrical motor 3 required Electromagnetic Drive moments that provide are bigger; Particularly when elevator operation during near the bottom, in this moment energy storage pressure near maximum working pressure, the resisting moment maximum that it provided, then electrical motor 3 needs the drive torque that provide maximum under the control of frequency converter 1.Electrical motor 3 is in the state of operating at full capacity this moment.
According to above analysis as seen, the key of this project energy savings, reduction installed power just is to have introduced the pressure energy transfer device, and with the conversion Conversion of energy be the additional drives moment that acts on 3 sides of electrical motor, thereby significantly reduced the output torque of electrical motor, reduced power of electric motor; Electrical motor 3, the big pump/motor 2 of major loop and the little pump/motor 27 of energy storage are operated in four quadrants, thereby have utilized the working ability of electrical motor 3 fully; The hydraulic volume speed control loop that adopts ac variable speed technology to constitute belongs to the power adaptive system, and the system effectiveness height has reduced the temperature rise of the operation energy consumption and the fluid of elevator, has avoided using expensive cooling vessel; The reduction of frequency converter and motor capacity not only makes the cost of system obtain reduction, and has saved the expense of user on electric wiring.And this project focus on how determining the determining of the choosing of each the operation point parameter of energy storage 30 in the accumulator loop such as accumulator loop pump/motor discharge capacity, motor power (output), charging pressure of accumulator p
0, the minimum precharge pressure p of energy storage
1, the highest precharge pressure p of energy storage
2Deng; Can see also that simultaneously up and descending these the two kinds of operating modes of elevator underloading near the bottom time of elevator heavy duty near the top time are comparison opposite extreme situations, electrical motor 3 all will be with full-load operation under these two kinds of situations.
From the angle of the installed power that reduces system to greatest extent, determine the energy storage working parameter based on following primitive rule, various loss due to frictions and the pump/motor of wherein having ignored system leak the volumetric loss that causes:
1) the energy storage 30 average power W that can provide
AverageBe the fully loaded required average power W of elevator
MaxWith the unloaded required average power W of elevator
MinHalf of sum, that is:
W
average＝(W
max+W
min)/2
Wherein: W
Max=p
2A v
W
min＝p
1A v
In the formula: A---the cross-sectional area of plunger 6;
The average velociity of v---plunger 6;
The time of t---plunger 6 one way operation;
p
a---average pressuure; p
a=(p
1+ p
2)/2;
Q
a---average discharge;
The gas volume of V---energy storage 30 ons the go.
2) according to the experience that obtains in making up frequency conversion (VVVF) modulated pressure elevator: when motor power (output) met the demands, the output torque of electrical motor but might not satisfy, and caused the moment overload; Directly reflection is exactly the motor current overload.Therefore consider the moment balance relation under two kinds of operating modes of electrical motor 4 fully loadeds:
Underloading is descending during (1) near the bottom
Fully loaded up during (2) near the top
In the formula: p
d---pump/motor 2 entrance pressures when underloading is descending;
p
u---heavily loaded pump/motor 2 delivery pressures when up;
T
Max---the motor maximum output torque;
q
Pth---the discharge capacity of pump/motor 2;
q
Sth---the discharge capacity of pump/motor 27;
On the basis of these two primitive rules as can be known in the native system:
W
average+W
motor＝W
max?W
motor＝W
max-W
average
W
motor＝(W
max-W
min)/2
In the formula: W
Motor---the rating horsepower of electrical motor 3;
The installed power that this shows system has significantly reduced.Because the existence of pump/motor element Volumetric efficiency, and the internal leakage of electromagnetic valve 29 make each cycle of run energy storage 30 all will lose partial volume, moving several back energy storage 30 with blank thus; For avoiding this phenomenon a recharging oil device to occur then must in system, setting up the volume that loses is compensated.Recharging oil device also has another critical function simultaneously, promptly satisfies energy storage oil-filled needs 30 first time, and the precharge pressure value so just need not extra oil-filled equipment by safety valve 39 controls.Therefore how reasonably the design and use recharging oil device also becomes an emphasis of system design.
Start recharging oil device simultaneously when each elevator moves energy storage 30 is carried out the process repairing, the repairing process also stopped when elevator stopped.Repairing is based on elevator with the Selection and Design of Hydraulic Pump and converts at the volume of an one-stroke accumulator loop loss in service and obtain, and is that example provides simple conversion process with up process below.
Elevator is the 2 required liquid capacity Vp that provide from ground floor to the attic pump/motor:
V
p＝sA/η
pv
Convert accumulator loop pump/motor 27 output fluid volume V s:
V
s＝(V
p/η
sv)*(q
sth/q
pth)
Accumulator loop is Vx through pump/motor 27 leakage volumes in this process:
The discharge capacity that accumulator loop leakage volume is converted is qx:
In the formula: η
Mv---the Volumetric efficiency of pump/motor 2;
η
Sv---the Volumetric efficiency of pump/motor 27.
Claims (1)
1. adopt the energy saver of the variable frequency hydraulic elevator of energy storage, it comprises AC vector frequency converter [1], big pump/motor [2], AC asynchronous motor [3], the photoelectric encoder of motor shaft side [4], plunger case and plunger [5,6], major loop electromagnetic valve [7], the anti-empty check valve [8] of inhaling of major loop, major loop by pass valve [9], lift car [10], computer controlled detecting unit [11], pressure sensor [12], pressure sensor signal line [19], the photoelectric encoder that tests the speed [23] on the car, hoistway and guide rail [24], AC asynchronous motor [3] is connected with coupler [26] with big pump/motor [2], more than all parts major loop and the load circuit of composition jointly; It is characterized in that: also comprise little pump/motor [27], the anti-empty check valve [28] of inhaling of subsidiary loop, subsidiary loop electromagnetic valve [29], bag type accumulator [30], repairing AC asynchronous motor [36], slippage pump [37], the anti-check valve [38] that pours in down a chimney of feed circuit, auxiliary accumulator loop and the energy storage feed circuit of forming with feed circuit by pass valve [39]; Little pump/motor [27] is connected with coupler [42] with AC asynchronous motor [3]; little pump/motor [27] oil outlet tap two-way; the one tunnel connects the anti-empty check valve [28] of inhaling of subsidiary loop; another road connects bag type accumulator [30] through subsidiary loop electromagnetic valve [29]; auxiliary and feed circuit by pass valve [39] a tunnel prevents that through feed circuit pouring in down a chimney check valve [38] connects slippage pump [37]; another road connects bag type accumulator [30], and computer controlled detecting unit [11] connects subsidiary loop electromagnetic valve [29] through control signal wire [31].
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|---|---|---|---|
| CN 01122224 CN1128090C (en) | 2001-06-14 | 2001-06-14 | Energy-storing power economizer for varying frequency driven hydraulic elevator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01122224 CN1128090C (en) | 2001-06-14 | 2001-06-14 | Energy-storing power economizer for varying frequency driven hydraulic elevator |
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| CN1128090C true CN1128090C (en) | 2003-11-19 |
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| CN102878151A (en) * | 2012-09-19 | 2013-01-16 | 浙江大学 | Multifunctional test device for high-speed heavy duty hydraulic system |
| CN103248129B (en) * | 2013-04-17 | 2016-08-24 | 三一重机有限公司 | Energy conversion device and method |
| CN103241619B (en) * | 2013-05-22 | 2015-08-05 | 太原理工大学 | The control method of a kind of energy-conserving elevator and operation thereof |
| CN103482440B (en) * | 2013-09-26 | 2015-06-24 | 苏州汇川技术有限公司 | Brake control system and brake control method for construction lift |
| CN103979388A (en) * | 2014-05-30 | 2014-08-13 | 马健勇 | Room-free pit-free barrier-free elevator |
| CN104234939B (en) * | 2014-08-26 | 2017-08-29 | 燕山大学 | A kind of energy storage type hydraulic wind power generating set |
| CN106704523A (en) * | 2015-11-16 | 2017-05-24 | 熵零股份有限公司 | Energy adjusting method |
-
2001
- 2001-06-14 CN CN 01122224 patent/CN1128090C/en not_active Expired - Fee Related
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| CN1322668A (en) | 2001-11-21 |
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According to article 9 of the patent law and article 13 of the detailed rules for the implementation of the patent law: 1122224.7 of the invention patents in this issue as a notice of authorization, and at the same time corresponding to the 1228018.6 utility model patent to be given up, and in the 19 volume of the 47 issue of the new type of communique on the patent right to abandon the announcement. |
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