CN1012514B - Automatic water supplying device and method for controlling same - Google Patents

Automatic water supplying device and method for controlling same Download PDF

Info

Publication number
CN1012514B
CN1012514B CN88101956A CN88101956A CN1012514B CN 1012514 B CN1012514 B CN 1012514B CN 88101956 A CN88101956 A CN 88101956A CN 88101956 A CN88101956 A CN 88101956A CN 1012514 B CN1012514 B CN 1012514B
Authority
CN
China
Prior art keywords
pump
parallel
driving
pressure
motor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
CN88101956A
Other languages
Chinese (zh)
Other versions
CN88101956A (en
Inventor
信耕靖
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Publication of CN88101956A publication Critical patent/CN88101956A/en
Publication of CN1012514B publication Critical patent/CN1012514B/en
Expired legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G05D16/20—Control of fluid pressure characterised by the use of electric means
    • G05D16/2006—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means
    • G05D16/2066—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using controlling means acting on the pressure source
    • G05D16/2073—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using controlling means acting on the pressure source with a plurality of pressure sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/02—Stopping, starting, unloading or idling control
    • F04B49/022—Stopping, starting, unloading or idling control by means of pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/02—Stopping of pumps, or operating valves, on occurrence of unwanted conditions
    • F04D15/029—Stopping of pumps, or operating valves, on occurrence of unwanted conditions for pumps operating in parallel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2203/00—Motor parameters
    • F04B2203/02—Motor parameters of rotating electric motors
    • F04B2203/0214—Number of working motor-pump units

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

The device comprises a plurality of parallel-connected pumps (1). each having a motor (1a), pressure detecting means consisting of a high pressure tank (8) and a pressure switch (7), disposed on one of the pumps (1) on the discharging side thereof; a controlling section (9), which controls the drive of the pumps, receiving signals coming from this pressure detecting means (7, 8), and motor rotation detecting means (10), which detects the drive state of the motors (1a); and in which section (9) comprises a calculating portion (11a), which uses signals from means (10) immediately after the beginning of the single drive of the pumps (1) to form a parallel drive controlling value to obtain a constant quantity of supplied water; and a comparing portion (11b), which compares the signals from means (10) with the parallel drive controlling value to control the parallel drive of the pumps (1).

Description

Automatic water supplying device and method for controlling same
The present invention relates to a kind of automatic water supply device and control method thereof, particularly a kind of like this automatic water supply device, wherein many pumps are connected in parallel, and the method for controlling this equipment.
In this class automatic water supply device of prior art, as shown in figure 11, pump 1 ' be connected in parallel mutually, each pump have a motor 1a '; Pressure water tank 8 ' with pump 1 ' be connected at its water outlet side; Pressure switch 7 ' the be installed in water outlet side of these pumps; Also be equipped with a control assembly 9 ', its receive from pressure switch 7 ' signal, be used for control pump drive unit starting and stop.
Below with reference to Figure 12 the operating condition of this automatic water supply device is described, the curve table of Figure 12 is understood the characteristic of drawing water, and abscissa is represented output Q among the figure, and ordinate is represented hydraulic pressure H.H 1It is the curve of output-hydraulic pressure under independent type of drive; And H 1' be the curve of output-hydraulic pressure under pump 1 ' type of drive in parallel.R 1' and r 1' be respectively pump 1 ' drive and the load curve under the type of drive separately in parallel connection.
When two pumps 1 among the figure ' all during in halted state and by joint door 6a ' water supply start, pressure water tank 8 ' in pressure be reduced to the starting pressure Pon(H of independent driving 1On a ' point).At this moment pressure switch 7 ' closure, and No. 1 pump 1 ' started separately.After beginning to drive, reduces output, and pressure H 1(H when rising to independent driving and stopping pressure P off 1On b ' point), No. 1 pump 1 ' just stop.When output increases at above-mentioned No. 1 pump 1 ' after beginning to drive, and pressure H 1Be reduced to No. 1 pump 1 ' the parallel connection of motor 1a ' drive starting pressure Pon ' time (H 1On c ' point), No. 2 pumps 1 ' after No. 1 pump, begin starting.Pump 1 ' parallel connection to drive be at its load curve R 1' with output-pressure curve H 1' the d ' of intersection point place realization.In this state, when the output Q by joint door 6a ' reduces, and pressure increases to the cancellation pressure P off ' time of driving in parallel, pump 1 ' just stop to drive, and carry out and drive (H separately 1F ' point).Can also quote JP-B-59-720 as the example published relevant with this equipment.
Yet, a kind of like this automatic water supply device and control method thereof according to prior art, because each pump 1 ' water outlet side pressure by pressure switch 7 ' detection, and therefore type of drive in parallel just can not control these pumps with high accuracy according to output also by this pressure switch 7 ' control.In other words, and then pump 1 ' after beginning to drive, the pressure of pump 1 ' water outlet side can not change along with actual water supply immediately, reduces thereby temporary transient excessive pressure may occur.This temporary transient pressure reduces and is easy to take place, particularly pressure water tank 8 ' volume situation about reducing under easier generation.When so temporary transient pressure taking place reduce, pressure drops to the starting pressure Pon ' that drives in parallel, just started pump 1 ' parallel connection drive.Yet, in fact owing to do not need so many output so that leave no choice but in parallel the driving and just can provide, so pressure reaches the cancellation pressure P off ' that drives in parallel immediately, pump 1 ' be stopped operation.Like this, after this, just carry out separately and drive.Under this independent type of drive, if output is remained stationary, pressure reduces and will produce again, next pump 1 ' starting again.Such method of operation repeats, and has produced oscillation phenomenon.
Furtherly, in this automatic water supply device, when pump 1 ' parallel connection drive and when driving alternately repeats separately, and not to be noted make different pump 1 ' driving time identical.
In addition, this automatic water supply device also have another problem since be applied to pump 1 ' supply voltage changing, make revolution speed change, thereby changed output.
First kind of automatic water supply device realizing according to the present invention, wherein a lot of parallels connection of pumps connect, and each pump has a motor; A pressure water tank links to each other with pump at the water outlet side of pump; Pressure-detecting device is installed in the water outlet side of pump; Also be equiped with a control assembly, be used for controlling priming of pump, it receives the signal from pressure-detecting device.The characteristics of this automatic water supply device are, are equiped with the motor checkout gear, can detect the driving condition of motor; Control assembly comprises a calculating section, and the signal from the motor checkout gear that produces immediately after the independent driving that it is captured in pump begins carries out computing, thereby forms a controlling value that drives in parallel; Control assembly also comprises a rating unit, and it is relatively from the signal of motor checkout gear and the controlling value of driving in parallel, with the parallel connection driving of control pump.
A kind of method of control automatic water supply device is: comprise a lot of pumps, each pump has a motor, and these parallels connection of pumps connect; A pressure water tank links to each other with pump at the water outlet side of pump; Pressure-detecting device is installed in the water outlet side of pump; The motor checkout gear, it detects the driving condition of motor; Also comprise a control assembly, it controls priming of pump, receives the signal from pressure-detecting device.The characteristics of this method are, the signal from the motor checkout gear that produces immediately after the independent driving that is captured in pump begins receives its signal, calculates a controlling value that drives in parallel; When obtaining a prearranged signal, relatively after the controlling value from the signal of motor checkout gear and driving in parallel, begun the parallel connection driving of pump without interruption.
Second kind of automatic water supply device according to the present invention is: comprise the pump that much is connected in parallel, each pump has a motor; A pressure water tank links to each other with pump at the water outlet side of pump; Pressure-detecting device is installed in the water outlet side of pump; Also comprise a control assembly, it controls priming of pump, receives the signal from pressure-detecting device.The characteristics of this automatic water supply device are, are equiped with the motor checkout gear, and it detects the driving condition of motor; Control assembly comprises a calculating section, and the signal from the motor checkout gear that produces immediately after the independent driving that it is captured in pump begins carries out computing, forms the controlling value of a driving in parallel; A rating unit is relatively from the signal of motor checkout gear and the controlling value of driving in parallel, with the parallel connection driving of control pump; And a transposition part, when the independent driving of pump repeated with driving in parallel, it controlled these pumps, so that they can alternately operate in independent driving condition.
The third automatic water supply device according to the present invention is: comprise the pump that much is connected in parallel, each pump has a motor; A pressure water tank links to each other with pump at the water outlet side of pump; Pressure-detecting device is installed in the water outlet side of pump; Also comprise a control assembly, it controls priming of pump, receives the signal from pressure-detecting device.The characteristics of this automatic water supply device are, are equiped with the motor checkout gear, and it detects the driving condition of motor; Control assembly comprises a calculating section, and the signal from the motor checkout gear that produces immediately after the independent driving that it is captured in pump begins carries out computing, forms the controlling value of a driving in parallel, to obtain a constant output; And a rating unit, it is relatively from the signal of motor checkout gear and the controlling value of driving in parallel, with the parallel connection driving of control pump.
According to this automatic water supply device and control method thereof, reference signal is made of the signal from the motor checkout gear, and for pressure, it is subjected to the control of output with higher precision; And, gather the pressure that controlling value that parallel connection that the calculated signals from the motor checkout gear goes out drives directly is not decided by the water outlet side of pump, but this value can be adjusted corresponding to output.By this way, may control in parallel the driving corresponding to output with high accuracy really.Reduce even the volume of pressure water tank reduces and temporarily produced a pressure, this pressure reduces not corresponding with output, and the parallel connection of pump drives also inoperative.
And, adopt this automatic water supply device, when parallel connection drives and driving repeats separately, be identical with number of run because these pump alternate runs, just make the running time of these pumps at independent driving condition.
In addition, owing to adopt this automatic water supply device, cause the revolution of motor to change even put on the voltage change on the motor of pump, it is constant still might to keep output, thereby can obtain a stable output.
At length narrate the present invention below with reference to accompanying drawings.In the accompanying drawings:
Fig. 1 is the structure chart of expression according to an automatic water supply device of the present invention;
Fig. 2 is the circuit diagram of the motor checkout gear that adopted in this automatic water supply device;
Fig. 3 is the circuit diagram of the presetting apparatus that adopted in this automatic water supply device;
Fig. 4 is the curve map of this automatic water supply device characteristic of expression;
Fig. 5 is the flow chart that shows the main program that a kind of method adopted of controlling this automatic water supply device;
Fig. 6 is the flow chart that is illustrated in a work subprogram in this main program;
Fig. 7 is the flow chart that is illustrated in a Parallel Control subprogram in this main program;
Fig. 8 is the time diagram of the driving condition of this automatic water supply device of expression;
Fig. 9 represents the characteristic of drawing water of pump, is used for illustrating the variation of the revolution of pump in this automatic water supply device;
Figure 10 shows the electrical power characteristic in the parallel connection driving control of the characteristic of drawing water;
Figure 11 is the structure chart of a kind of prior art automatic water supply device of expression; And
Figure 12 shows the watering supply characteristic of automatic water supply device shown in Figure 11.
To Figure 10 one embodiment of the present of invention are described with reference to Fig. 1 below.In Fig. 1, each pump 1 all is to constitute by the mode that the runner (not shown) of the axis of rotation of motor 1a and the part 1b that draws water is directly linked together.A suction water pipe 4 is connected with pump 1 in the side of drawing water of pump.The lower end of suction pipe 4 is immersed in the water in a pond 3.Water in the pond 3 separates with water supply, and is stored in the pond 3.Outlet pipe 5 is connected with pump 1 at the water outlet side of pump.On outlet pipe 5, be equiped with a valve 5a.Outlet pipe 5 is connected to a common conduit 6.The end of common conduit 6 is divided into many branch pipe(tube)s, is equipped with on it among many joint door 6a(Fig. 1 and only shows 2 joint doors).2 pumps 1 are installed in parallel between the water and common conduit 6 in pond 3, and each pump has a suction water pipe 4 and an outlet pipe 5.The type of drive of pump 1 or driving separately, or in parallel the driving, this depends on output.A pressure switch 7 and a pressure water tank 8 of decomposition pressure checkout gear are installed on the outlet pipe 5 of pump 1.This pressure-detecting device also can replace this pressure switch 7 with a pressure sensor.When supplying water by joint door 6a water supply start and by pressure water tank 8, the pressure in the pressure water tank 8 reduces, and pressure switch 7 closures.Signal from pressure switch 7 is imported in the programme-control part 11 of a control assembly 9.Control assembly 9 comprises an electrical power test section 10, and it has formed the motor checkout gear, detects the driving condition of motor 1a.The electrical power of each motor 1a is detected in electrical power test section 10, and resulting signal outputs to programme-control part 11.Programme-control part 11 is provided with a calculating section 11a, and it is that computing is carried out on the basis with the signal from electrical power test section 10, and this signal is to produce immediately after the independent driving of pump 1 begins, to form a controlling value that drives in parallel; A rating unit 11b, controlling value that more above-mentioned parallel connection drives and the signal from electrical power test section 10 are with the parallel connection driving of control pump 1; Also have a transposition part 11c, be used for control pump 1, when the independent driving of pump and in parallel the driving when repeating, for driving pump 1 alternately makes it to operate in independent driving condition.Signal from program controlling element 11 is output to each motor 1a.The motor checkout gear also can replace electrical power test section 10 with the parts of a current detecting part or a detection revolution.
In Fig. 2, motor 1a is parallel-connected on the power supply 12.Each motor links to each other by an electromagnetic contactor 13,14 again.An electrical power detection part 10 is connected on each circuit between electromagnetic contactor 13,14 and the power supply 12.Electrical power detection part 10 is parallel-connected to the Hall element 16 of power supply by a coil that is connected in series to power circuit 15, one and the rectification-filter circuit 17 of an output that is connected to Hall element 16 is formed.In this way, adopt the amplification of Hall element 16, just can represent electrical power, measure electrical power arbitrarily with the form of DC voltage.The output of two rectification-filter circuits 17 in Fig. 2 with
Figure 88101956_IMG2
With
Figure 88101956_IMG3
Expression.These With The meaning be they respectively with Fig. 3 in
Figure 88101956_IMG6
With
Figure 88101956_IMG7
Link to each other.Each motor 1a includes a phase advance capacitor 18.In addition, this electrical power detection part 10 also can be a current detecting part.
In Fig. 3, a program controlling element 11 is by a sequence control element 19, and for example a microcomputer constitutes as core parts.Power supply 12 is by a power transformer 20, rectification-filter circuit 21 and constant voltage circuit 22 V with sequence control element 19 DDAnd V SSPort links to each other.In addition, a clock circuit 23 also is connected on the sequence control element 19, has formed the reference timer of element 19.
Coil 24 and 25 is used for respectively disconnecting and connecting electromagnetic contactor 13 and 14, and these two coils are connected with power supply 12 by a contact 7a of a single loop three contact switch 26 and pressure switch 7.
Input to sequence control element 19 is by port P10, and P40 and P41 realize.The circuit that comprises another contact 7b of pressure switch 7 is connected to port P10.The output of the electrical power detection part 10 of motor ( With ) link port P40 and P41 by comparator 27 and 28 respectively.A D/A 29 is the numeral of port P30, P31, P32 and P33 to be converted to analog quantity, and produces voltage signal corresponding to the electrical power that will judge, is input in comparator 27 and 28.Comparator 27 and 28 judges whether the output of the electrical power detection part of motor 1a has reached predetermined value, and the result is input to port P40 and P41 respectively.
One side of a zero crossing timing input circuit 30 links to each other with the secondary side of power transformer 20, and opposite side links to each other with the port INT of sequence control element 19.The signal of zero crossing timing circuit output links to each other with 32 with light-operated triacs 31 with P21 by the port P20 of sequence control element 19.These light-operated triacs 31 and 32 drive bidirectional triode thyristor element 33 and 34 as switch element.Triacs 33 and 34 is connected in parallel with the contact of single loop three switch contacts 26 respectively, and coil 24 and 25 also is connected on these contacts.By means of the conversion of single loop three switch contacts 26, coil 24 and 25 the open and close that switches on and off a contact 7a that can be by pressure switch 7 realize; This operation is irrelevant with the process control signal from sequence control element, even also can carry out owing to failure and other reasons loses program control signal.The starting of pump 1 and to stop be exactly to realize by this way.
The operation situation of this automatic water supply device is described with reference to Fig. 4 below.Fig. 4 is the curve map that shows the characteristic of drawing water, and abscissa is represented output Q among the figure, ordinate representative pressure H and electrical power W.H 1Be the output-pressure curve of pump 1 when driving separately; And H 1' be the output-pressure curve of pump 1 when parallel connection drives.W 1It is the output-electric power curves of pump 1.R 1And r 1Be respectively the load curve of pump 1 when parallel connection drives and drive separately.When two pumps 1 all were in halted state and pass through joint door 6a water supply start, the pressure in the pressure water tank 8 was reduced to independent driving starting pressure Pon(H 1On a point).At this moment pressure switch 7 closures, No. 1 pump 1 drives separately.After beginning to drive, reduces and pressure H output 1(H when rising to independent driving and stopping pressure P off 1On the b point), No. 1 pump 1 is just out of service.When output increases and pressure H after above-mentioned No. 1 pump 1 begins to drive 1(the H when parallel connection that drops to the motor 1a of No. 1 pump 1 drives starting pressure Pon 1On the c point), No. 2 pumps 1 just begin to drive after first pump.It is at load curve R that the parallel connection of pump 1 drives 1With output-pressure curve H 1' the intersection point place carry out.In this state, when the output Q by joint door 6a reduces and the motor 1a of pump 1 is consumed electrical power is reduced in parallelly when driving cancellation power Woff, above-mentioned No. 1 pump 1 stops to drive, and only No. 2 pumps 1 drive (H separately 1On the f point).
The control method of this automatic water supply device is described below with reference to Fig. 5 to Fig. 7.Fig. 5 shows main program.Program is by connecting power supply 12 beginnings, at first initially adjust (program step 500).This is initially adjusted is by the place of safety parameter F, S and J to be carried out in the random access memory of sequence control element 19, the F=1 that adjusts, S=0, J=0.F is the parameter of No. 1 pump of control; The 5th, the parameter of No. 2 pumps of control; J is used to judge the parameter that drives in parallel.Then, pressure has reached the pressure P on(program step 510 of pressure switch 7 actions by the time), just begin to carry out a subprogram, at that time with regard to driving pump 1(program step 520).
Fig. 6 expresses this work subprogram.In this work subprogram, to judge at first whether parameter F equals 1(program step 600).Under the situation of F=1, No. 1 pump 1 was driven (program step 610) before another.If F ≠ 1, No. 2 pump 1 is driven (program step 620) prior to another.After this detect the electrical power W that the motor 1a of driving pump 1 is consumed immediately S1(program step 630).According to the electrical power W that is detected S1Calculate and just obtained driving starting electrical power Won in parallel and the cancellation electrical power Woff(program step 640 that drives in parallel), process turns back to main program again.After returning main program, just begin to carry out driven element program in parallel (program step 530).
Fig. 7 expresses this parallel connection and drives the control subprogram.In this driven element program in parallel, the electrical power W that the motor 1a of driving pump 1 is consumed 1Be detected (program step 710).Electrical power W 1Compare (program step 720) with driving starting electrical power Won in parallel.If W 1〉=Won, the pump 1 that drove separately before another pump want utilization factor F to judge (program step 730).If parameter F=1, No. 2 pumps 1 of Qu Donging are not driven (program step 740) after another pump.If F ≠ 1, No. 1 pump 1 of Qu Donging is not driven (program step 750) after another pump.After this, parameter J is placed in J=1(program step 760), to move in parallel connection driving process with the expression pump, this program turns back to main program.Electrical power W with above-mentioned detected motor 1a SCompare with the electrical power Won that adjusts (program step 720).If W S＜Won will judge whether parameter J is 1.If J ≠ 1(is in independent driving process), program turns back to main program.If J=1(is in parallel connection driving process), the electrical power W of detection 1To compare (program step 771) with driving cancellation power Woff in parallel.If W 1＞Woff, program turns back to main program; If W 1≤ Woff will judge parameter F (program step 772).If parameter F=1, prior to driven No. 1 pump 1 of another pump with regard to (program step 773) out of service.If F ≠ 1 is prior to driven No. 2 pumps 1 of another pump (program step 774) out of service.Next step, the state of the state of parameter F and parameter 5 is intercoursed (" 1 " and " 0 " is converted); That is to say that the Position Control order front and the back has been exchanged (program step 775).After this, parameter J is placed in J=0, and this shows that in parallel the driving cancel (program step 776), and program turns back to main program.
Then, in main program, wait for that the pressure of pressure switch 7 changes to Poff(program step 540), program repeats the control subprogram that drives in parallel, is increased to Poff up to pressure.When pressure reached Poff, the pump 1 in the driving process was with regard to (program step 550) out of service.Next step, the state of parameter F and the state of parameter S are intercoursed (" 1 " and " 0 " exchanges); That is to say that the Position Control order front and the back has been exchanged (program step 560).After this, program is waiting for that the pressure of pressure switch 7 changes to Pon(program step 510).
Fig. 8 is a time diagram, expresses an example of the driving condition of this automatic water supply device.Can be clear that from this figure the mutual balance of driving time of the driving time of No. 1 pump and No. 2 pumps gets fine.
Below with reference to Fig. 9 and Figure 10, illustrate according to this control method: even the rotating speed of pump 1 motor 1a changes, this control also is possible.The curve table of Fig. 9 is understood the characteristic of drawing water under the rotation speed change situation of pump 1 motor 1a.Abscissa is represented output Q among the figure, ordinate representative pressure H and electrical power W.H 1To H 3Output-pressure characteristic when being pump 1 independent the driving, their relative speed variation is respectively " 1 ", " 0.95 " and " 0.9 "; H 1' to H 3' output-pressure characteristic when to be that pump 1 is in parallel drive, their relative speed variation is respectively " 1 ", " 0.95 " and " 0.9 ".W 1To W 3Be the output-electrical power characteristic curve of pump 1, their relative speed variation is respectively " 1 ", " 0.95 " and " 0.9 ".R 1To R 3Be load curve, their relative speed variation is respectively " 1 ", " 0.95 " and " 0.9 ".r 1It is a load curve.Suppose that the starting electrical power that drives in parallel drives the cancellation electrical power respectively with Won with parallel connection 1And Woff 1Representative; They can be according to detected electrical power W S1Obtain.W S1Be to be reduced to independent driving starting pressure Pon when pressure, and pressure switch 7 is when closed, the electrical power of the pump 1 motor 1a that after pump 1 beginning drives separately, records immediately.Output corresponding to these points is Q S1, Qon and Qoff.When parallel connection driving starting output is Qon, W 2And W 3Parallel connection drive the starting electrical power and be respectively Won 2And Won 3; When parallel connection driving cancellation output is Qoff, W 2And W 3Parallel connection drive the cancellation electrical power and be respectively Woff 2And Woff 3In addition, pump 1 is at H 2And H 3Under independent driving starting electrical power be respectively W S2And W S3
The electrical power W of the motor 1a that after pump 1 drives separately, records immediately S1, W S2, W S3With driving starting electrical power Won in parallel 1, Won 2, Won 3Between relation or W S1, W S2, W S3With driving cancellation electrical power Woff in parallel 1, Woff 2, Woff 3Between relation be linear, as shown in figure 10.They can be represented with following formula:
Won＝K 1W S+K 2……（1）
Woff＝K 3W S+K 4……（2）
(K 1To K 4Be constant)
Therefore, the starting electrical power Won that drives in parallel can be easily with detection electrical power W with the cancellation electrical power Woff that drives in parallel SCalculate.
Detect electrical power W according to this automatic water supply device and such control method SThe reference signal that forms corresponding to output Q just has higher precision than corresponding to pressure; In addition, the parallel connection of adopting this detection electrodymamometer to calculate drives starting electrical power Won or the pressure of cancelling electrical power Woff and water outlet side that drives in parallel does not have direct relation, but they can be adjusted corresponding to output.By this way, might be corresponding to output Q, with the high accuracy control starting that drives in parallel with stop.Even the volume of pressure water tank 8 reduces, and produce temporary transient pressure reduction, it does not also correspond to output, and pump 1 can not begin in parallel the driving.
And, according to this automatic water supply device, when the parallel connection driving of pump 1 repeats with independent driving, be identical with driving number of times because two pump 1 alternate runs, make the driving time of two pumps 1 at independent driving condition.
Further, according to this automatic water supply device, even be added in voltage change on the pump 1 motor 1a, and revolution speed etc. changes to some extent, because that the output of pump 1 can be kept is constant, just might obtain a stable output.
According to the present invention, at first might obtain a kind of automatic water supply device and control method thereof, this method can positively drive so that high accuracy control is in parallel corresponding to output.The second, might obtain a kind of automatic water supply device, it can further make the driving time of pump identical with the driving number of times.The 3rd, might obtain a kind of automatic water supply device, it can supply with the more stable water yield.

Claims (9)

1, a kind of automatic water supply device includes two pumps that are connected in parallel, and a pressure water tank links to each other with pump at the water outlet side of pump; Pressure-detecting device is installed in the water outlet side of pump; The motor checkout gear, it detects the driving condition as the motor of the drive source of pump; A control assembly, the driving of its control pump receives the signal from above-mentioned pressure-detecting device; It is characterized in that above-mentioned control assembly comprises a calculating section, the signal from the motor checkout gear that produces immediately after the independent driving that it is captured in pump the begins row operation of going forward side by side forms the controlling value of a driving in parallel; Also comprise a rating unit, it is relatively from the signal of motor checkout gear and the controlling value of driving in parallel, with the parallel connection driving of control pump; And a transposition part, when the independent driving of pump repeated with driving in parallel, it controlled these pumps, so that they can alternately operate in independent driving condition.
2, according to a kind of automatic water supply device of claim 1, its characteristics are that above-mentioned pressure-detecting device is made of a pressure switch.
According to a kind of automatic water supply device of claim 1, it is characterized in that 3, the said motor checkout gear is an electrical power detection part, it detects the electrical power that said motor consumed.
4, according to a kind of automatic water supply device of claim 1, its characteristics are that above-mentioned control assembly comprises a microcomputer.
5, according to a kind of automatic water supply device of claim 1, its characteristics are that the above-mentioned controlling value that drives in parallel is a starting value that drives in parallel.
6, according to a kind of automatic water supply device of claim 1, its characteristics are that the above-mentioned controlling value that drives in parallel comprises a starting value and the cancellation value that drives in parallel of driving in parallel.
7, according to a kind of automatic water supply device of claim 5 or 6, its characteristics are that above-mentioned driving starting value in parallel is a value corresponding to output, the starting value when this is worth greater than independent driving of pump.
8, according to a kind of automatic water supply device of claim 1, it is characterized in that, this control assembly comprises a calculating section, the signal that produces immediately after the independent driving that it is captured in pump the begins row operation of going forward side by side from the motor checkout gear, form a controlling value that drives in parallel, to obtain a constant output.
9, a kind of method of controlling automatic water supply device comprises two pumps that are connected in parallel, and a pressure water tank links to each other with pump at the water outlet side of pump; Pressure-detecting device is installed in the water outlet side of pump; The motor checkout gear, it detects the driving condition of motor; Also comprise a control assembly, it controls priming of pump, receives the signal from pressure-detecting device, and the characteristics of this method are to comprise the following steps:
The signal from the motor checkout gear that produces immediately after the independent driving that is captured in pump begins receives its signal, calculates a controlling value that drives in parallel; And
When obtaining a prearranged signal, relatively after the controlling value from the signal of motor checkout gear and driving in parallel, begin the parallel connection driving of pump without interruption.
CN88101956A 1987-04-06 1988-04-06 Automatic water supplying device and method for controlling same Expired CN1012514B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP82917/87 1987-04-06
JP62082917A JPS63248997A (en) 1987-04-06 1987-04-06 Automatic water supplying device and control thereof

Publications (2)

Publication Number Publication Date
CN88101956A CN88101956A (en) 1988-10-26
CN1012514B true CN1012514B (en) 1991-05-01

Family

ID=13787599

Family Applications (1)

Application Number Title Priority Date Filing Date
CN88101956A Expired CN1012514B (en) 1987-04-06 1988-04-06 Automatic water supplying device and method for controlling same

Country Status (5)

Country Link
JP (1) JPS63248997A (en)
KR (1) KR920003111B1 (en)
CN (1) CN1012514B (en)
GB (1) GB2204153B (en)
HK (1) HK51391A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010148623A1 (en) * 2009-06-23 2010-12-29 云南大红山管道有限公司 Online switching method of high-pressure long-distance slurry pipeline transportation multi-stage pump station

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4328312A1 (en) * 1993-08-23 1995-03-02 Draegerwerk Ag Fountain pen with variable filling reservoir for pressure compensation between reservoir and environment
DE4330519B4 (en) * 1993-09-09 2004-08-05 Sms Demag Ag descaling
FR2824601B1 (en) * 2001-05-09 2003-08-08 Ksb Sa MOTOR PUMP GROUP WITH TIMING OF THE POWER ON OF THE MOTOR
JP2010104690A (en) * 2008-10-31 2010-05-13 Toshiba Corp Vacuum cleaner
ES2522166T3 (en) * 2011-01-14 2014-11-13 Grundfos Management A/S System and method to control the pressure in a network
JP5416729B2 (en) * 2011-03-22 2014-02-12 株式会社日立製作所 Water central monitoring and control device, water monitoring control system and water monitoring control program
CN102226649B (en) * 2011-04-13 2012-11-28 杨盛林 Industrial high-temperature waste gas conditioning and automatic constant-temperature system
CN108825480B (en) * 2018-06-01 2020-02-21 重庆大学 Water pump management and scheduling method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010148623A1 (en) * 2009-06-23 2010-12-29 云南大红山管道有限公司 Online switching method of high-pressure long-distance slurry pipeline transportation multi-stage pump station

Also Published As

Publication number Publication date
KR920003111B1 (en) 1992-04-18
GB2204153B (en) 1991-02-06
GB2204153A (en) 1988-11-02
CN88101956A (en) 1988-10-26
HK51391A (en) 1991-07-12
JPS63248997A (en) 1988-10-17
GB8807901D0 (en) 1988-05-05
KR880012895A (en) 1988-11-29

Similar Documents

Publication Publication Date Title
CN1012514B (en) Automatic water supplying device and method for controlling same
DE68909232T2 (en) STARTING A BRUSHLESS DC MOTOR.
DE102012208452A1 (en) Drive device and driving method for a brushless motor
CN1266826C (en) Exciting control device of synchromotor
CN114070138B (en) Winding switching control system, method and device of permanent magnet synchronous linear motor
CN1353499A (en) Inertial torque operation method of electric motor and its driving device
US4593792A (en) Apparatus for controlling a hydraulic elevator
CN1578098A (en) Method and device for driving induction motor
US5991505A (en) Switching motor control apparatus
CN87107273A (en) Hydraulic transmission device
RU2181922C2 (en) Electromagnetic rotor bracket control system
CN1214514C (en) Method and apparatus for switching AC machine between drive and power supply
CN1015532B (en) Mechanism for starting and controlling lift
KR960012102B1 (en) Oil-pressure type elevator speed control device & method
SU1286339A2 (en) Hydraulic system for controlling carriage actuating mechanisms and turning manipulator arm
SU1406295A1 (en) Apparatus for controlling the hydraulic actuator of ship lock gate
KR20180022533A (en) Booster control device and method of controlling voltage of booster control device
SU1064408A1 (en) Drive of hoist engine with variable radii of rope coiling
RU2015521C1 (en) Electric hydraulic servo drive
SU1580518A1 (en) Method of controlling multiphase stepping motor acceleration
SU1150724A1 (en) Two-motor d.c. drive
SU1185531A1 (en) Device for controlling excitation of electric machine
SU1084727A1 (en) Position electric drive
CN1023530C (en) Motor controlling system
SU1366995A1 (en) Arrangement for regulating water feed in canal with pump stations

Legal Events

Date Code Title Description
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C06 Publication
PB01 Publication
C13 Decision
GR02 Examined patent application
C14 Grant of patent or utility model
GR01 Patent grant
C15 Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993)
OR01 Other related matters
C19 Lapse of patent right due to non-payment of the annual fee
CF01 Termination of patent right due to non-payment of annual fee