WO2014175248A1 - Dispositif de pompe - Google Patents

Dispositif de pompe Download PDF

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Publication number
WO2014175248A1
WO2014175248A1 PCT/JP2014/061247 JP2014061247W WO2014175248A1 WO 2014175248 A1 WO2014175248 A1 WO 2014175248A1 JP 2014061247 W JP2014061247 W JP 2014061247W WO 2014175248 A1 WO2014175248 A1 WO 2014175248A1
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WO
WIPO (PCT)
Prior art keywords
pump
target pressure
control curve
pressure control
value
Prior art date
Application number
PCT/JP2014/061247
Other languages
English (en)
Japanese (ja)
Inventor
亮太郎 唐木
展宏 檜垣
陽介 原田
祥子 宮内
康貴 小西
一宏 金田
手嶋　友治
Original Assignee
株式会社 荏原製作所
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
Priority claimed from JP2013094552A external-priority patent/JP6133672B2/ja
Priority claimed from JP2013095808A external-priority patent/JP6133676B2/ja
Application filed by 株式会社 荏原製作所 filed Critical 株式会社 荏原製作所
Priority to EP14788422.5A priority Critical patent/EP2990652A4/fr
Priority to CN201480022655.7A priority patent/CN105121858B/zh
Priority to KR1020157032925A priority patent/KR20160002957A/ko
Publication of WO2014175248A1 publication Critical patent/WO2014175248A1/fr

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    • 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
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0066—Control, e.g. regulation, of pumps, pumping installations or systems by changing the speed, e.g. of the driving engine

Definitions

  • the present invention relates to a pump device for transferring a liquid, and more particularly to a pump device suitably used as a water supply device for supplying water to a building.
  • FIG. 1 is a schematic view showing a general water supply apparatus.
  • the suction port of the water supply apparatus 100 is connected to a water pipe 4 or a water receiving tank (not shown) through an introduction pipe 5.
  • a water supply pipe 7 is connected to the discharge port of the water supply apparatus 100, and the water supply pipe 7 communicates with a water supply device (for example, a faucet) on each floor of the building.
  • the water supply apparatus 100 increases the pressure of the water from the water pipe 4 or the water receiving tank and supplies the water to each water supply device of the building.
  • the water supply apparatus 100 in which the suction side of the pump is directly connected to the water pipe 4 through the introduction pipe 5 is a pump 2, a motor 3 as a drive source for driving the pump 2, and a drive apparatus for driving the motor 3 at a variable speed.
  • a bypass pipe 8 for supplying water only by the pressure of the water pipe 4 is provided between the introduction pipe 5 and the water supply pipe 7, and a check valve 23 is provided in the bypass pipe 8.
  • two sets of the pump 2, the motor 3, the check valve 22, and the flow switch 24 are provided, and these are provided in parallel.
  • One set or three or more sets of pumps, motors, check valves, and flow switches may be provided.
  • the suction side of the pump 2 is connected to the water pipe 4 as shown in FIG. 1.
  • the suction side of the pump 2 is connected to the water reception tank via the introduction pipe 5. Connected.
  • the backflow prevention device 25 the suction side pressure sensor 21, and the bypass pipe 8 shown in FIG. 1 are not provided.
  • the check valve 22 is provided in a discharge pipe 32 connected to the discharge port of the pump 2 and is a valve for preventing a back flow of water when the pump 2 is stopped.
  • the flow switch 24 is a flow rate detector that detects that the flow rate of water flowing through the discharge pipe 32 has decreased to a predetermined value.
  • the pressure sensor 26 is a water pressure measuring device for measuring the discharge side pressure (that is, the back pressure applied to the water supply apparatus 100).
  • the pressure tank 28 is a pressure retainer for retaining the discharge side pressure while the pump 2 is stopped.
  • the water supply apparatus 100 includes a control unit 35 that controls the water supply operation.
  • the inverter 20, the flow switch 24, the pressure sensor 21, and the pressure sensor 26 are connected to the control unit 35 via signal lines.
  • the control unit 35 issues a command to the inverter 20 to temporarily increase the operation speed of the pump 2 and accumulates pressure in the pressure tank 28. After that, the operation of the pump 2 is stopped.
  • the control unit 35 issues a command to the inverter 20 to start the operation of the pump 2.
  • the control unit 35 stores in advance a starting pressure that serves as a trigger for starting the pump 2.
  • the discharge side pressure of the pump 2 decreases.
  • the control unit 35 starts the pump 2.
  • the estimated terminal pressure constant control is performed based on the output value of the pressure sensor 26.
  • the flow rate of water discharged from the pump 2 decreases.
  • the flow switch 24 detects that the flow rate of water from the pump 2 has decreased to a predetermined value, the flow switch 24 sends a detection signal to the control unit 35.
  • the control unit 35 receives this detection signal, issues a command to the inverter 20, increases the rotational speed of the pump 2 until the discharge side pressure reaches a predetermined stop pressure, and then stops the pump 2.
  • FIG. 2 is an operational characteristic curve diagram of the pump for explaining an example of the estimated terminal pressure constant control.
  • the horizontal axis represents the flow rate of water
  • the vertical axis represents the discharge pressure, that is, the head (head).
  • PA shown in FIG. 2 is the discharge-side pressure of the pump 2 at the maximum flow rate
  • PB is the discharge-side pressure of the pump 2 during the shut-off operation of the pump 2 (that is, when the flow rate is 0).
  • the curve indicated by the symbol N MAX is a performance curve of the pump 2 when the pump 2 is operated at the rotational speed N MAX that achieves the pressure PA
  • the curve indicated by the symbol N MIN is the rotational speed that achieves the pressure PB.
  • (Cutoff speed) A performance curve of the pump 2 when the pump 2 is operated at N MIN .
  • the target pressure control curve R is a curve determined on the basis of the sum of the pipe loss depending on the maximum head of the building, the pressure required to use the water supply device, and the flow rate.
  • the target pressure control curve R is a curve used for performing constant control of the estimated terminal pressure, and is generally a quadratic curve.
  • the target pressure control curve R represents the relationship between the discharge flow rate of the pump 2 and the target pressure of the pump 2.
  • the pump 2 is operated at an operating point that is an intersection of the performance curve N and the target pressure control curve R.
  • the rotational speed of the pump 2 is controlled in consideration of the pipe resistance (indicated by the target pressure control curve R) corresponding to the flow rate of water. That is, the rotational speed of the pump 2 is controlled based on the output value of the pressure sensor 26 so that the discharge side pressure of the pump 2 changes along the target pressure control curve R. Therefore, when the flow rate is small, the pipe resistance is small, and accordingly, the required power of the pump 2 is reduced, and energy saving operation is realized.
  • the discharge side pressure of the pump 2 is controlled between PA and PB. Therefore, during steady operation, the pump 2 is driven at a rotational speed of N MIN or higher.
  • Patent Document 1 proposes a water supply device that can operate a pump at a lower rotational speed while securing a necessary flow rate. According to Patent Document 1, a plurality of target pressure control curves are stored in advance in the control unit, and the pump is controlled based on any one target pressure control curve. Therefore, energy saving operation can be realized by selecting an optimum one from a plurality of target pressure control curves prepared in advance.
  • the target pressure control curve is manually selected and switched manually, and the target pressure control curve is automatically selected and switched. Absent. Further, since the target pressure control curve to be used is selected from a plurality of target pressure control curves stored in advance in the control unit, the target pressure control curve itself cannot be adjusted according to the operation status of the water supply apparatus.
  • the operating condition of the water supply device can vary with time. For example, in schools, the amount of water used suddenly increases during holidays, and little water is used at night. As described above, since the operating condition of the water supply apparatus can change depending on time or other factors, it is desirable to adjust the optimum target pressure control curve. Furthermore, it is also desired to adjust the optimum target pressure control curve in order to realize further energy saving.
  • the present invention has been made in view of the above-described circumstances, and an object thereof is to provide a pump device that can automatically determine an optimum target pressure control curve according to an operation state.
  • one aspect of the present invention includes a pump, a motor that drives the pump, a driving device that drives the motor at a variable speed, and a pressure sensor that measures a discharge-side pressure of the pump.
  • a controller that starts the pump when the discharge side pressure drops to a predetermined start pressure and controls the drive device so that the discharge side pressure becomes a target pressure on a target pressure control curve.
  • the control unit determines a minimum value of the discharge side pressure after the pump is started, and calculates a difference between the minimum value and a predetermined lower limit value of the discharge side pressure.
  • the target pressure control curve is corrected based on the difference.
  • the control unit moves the target pressure control curve to the lower head side based on the difference, thereby moving the target pressure control curve. It is characterized by correcting.
  • the control unit subtracts the difference from a target pressure during pump shutoff operation on the target pressure control curve. The pressure control curve is corrected.
  • the control unit moves the target pressure control curve to the high head side based on the difference, thereby setting the target pressure control curve. It is characterized by correcting.
  • the control unit adds the difference to a target pressure at the time of pump shut-off operation on the target pressure control curve. The pressure control curve is corrected.
  • control unit calculates the difference every time the pump is started, acquires a plurality of differences, and corrects the target pressure control curve based on the plurality of differences.
  • control unit calculates an average of the plurality of differences, and corrects the target pressure control curve based on the average of the plurality of differences.
  • control unit calculates the difference every time the pump is started during a predetermined time and acquires a plurality of differences. In a preferred aspect of the present invention, the control unit calculates the difference each time the pump is started and acquires a plurality of differences until the number of start times of the pump reaches a predetermined number. .
  • the control unit obtains a plurality of differences by calculating the difference each time the pump is started on the condition that the minimum value is larger than the lower limit value. And in a preferred aspect of the present invention, the control unit corrects the target pressure control curve by moving the target pressure control curve to the low head side based on an average of the plurality of differences. In a preferred aspect of the present invention, the control unit corrects the target pressure control curve by subtracting an average of the plurality of differences from a target pressure at a pump cutoff operation on the target pressure control curve.
  • the control unit corrects the target pressure control curve based on a difference between the minimum value and the lower limit value when the minimum value is smaller than the lower limit value. To do.
  • the control unit moves the target pressure control curve to the high head side based on a difference between the minimum value and the lower limit value.
  • the control unit calculates a difference between the minimum value and the lower limit value as a target during pump cutoff operation on the target pressure control curve. The target pressure control curve is corrected by adding to the pressure.
  • the control unit calculates the difference each time the pump is started for a predetermined time to obtain a plurality of differences, and the minimum value among the plurality of differences is A first average value, which is an average of differences when larger than the lower limit value, is calculated, and a second average which is an average of differences when the lowest value is smaller than the lower limit value among the plurality of differences.
  • a correction value is calculated by calculating a value, subtracting the second average value from the first average value, and subtracting the correction value from the target pressure during pump shut-off operation on the target pressure control curve Thus, the target pressure control curve is corrected.
  • the control unit calculates the difference each time the pump is started and acquires a plurality of differences until the number of start times of the pump reaches a predetermined number.
  • a first average value that is an average of differences when the lowest value is larger than the lower limit value, and among the plurality of differences, a difference when the lowest value is smaller than the lower limit value is calculated.
  • a second average value that is an average is calculated, a correction value is calculated by subtracting the second average value from the first average value, and a target pressure at the time of pump cutoff operation on the target pressure control curve The correction value is subtracted from the target pressure control curve to correct the target pressure control curve.
  • the control unit sets the first minimum value of the discharge side pressure after the pump is started as the minimum value. In a preferred aspect of the present invention, the control unit determines the minimum value after the discharge side pressure is stabilized. In a preferred aspect of the present invention, the control unit corrects the target pressure control curve after the discharge side pressure is stabilized. In a preferred aspect of the present invention, the control unit determines that the discharge-side pressure is stable when the discharge-side pressure is larger than a predetermined reference value for a predetermined monitoring time. .
  • control unit gradually switches from the current target pressure control curve to the corrected target pressure control curve. In a preferred aspect of the present invention, the control unit gradually switches from the current target pressure control curve to the corrected target pressure control curve over a predetermined transition time.
  • the control unit gradually switches from the current target pressure control curve to the corrected target pressure control curve at a predetermined change rate.
  • the lower limit value is a pressure obtained by adding a pressure loss generated in the water supply device to a head from the pump device to the water supply device at the highest position.
  • the pump is started when the discharge side pressure of the pump drops to a predetermined start pressure so that the discharge side pressure becomes a target pressure on a target pressure control curve.
  • a control device for controlling the operation of the pump determining the lowest value of the discharge side pressure after the pump is started, calculating the difference between the lowest value and a predetermined lower limit value of the discharge side pressure, The target pressure control curve is corrected based on the difference.
  • a preferred aspect of the present invention is characterized in that each time the pump is started, the difference is calculated to obtain a plurality of differences, and the target pressure control curve is corrected based on the plurality of differences.
  • the target pressure control curve is automatically corrected based on the difference between the minimum value of the discharge side pressure measured after the pump is started and the lower limit value of the discharge side pressure. Therefore, it is possible to obtain an optimum target pressure control curve corresponding to the operation state of the pump.
  • FIG. 15A is a side view showing the guide cover.
  • FIG. 15B is a view of the guide cover shown in FIG. 15A as viewed from below. It is a figure which shows the structural example of a control part (control apparatus).
  • FIG. 3 is a schematic diagram showing a water supply apparatus which is an example of a pump apparatus according to an embodiment of the present invention.
  • the water supply apparatus 1 shown in FIG. 3 has the same configuration as the water supply apparatus 100 shown in FIG.
  • FIG. 4 is a diagram showing a target pressure control curve according to one embodiment of the present invention.
  • the vertical axis represents the discharge side pressure (lift) of the pump 2
  • the horizontal axis represents the flow rate of water discharged from the pump 2.
  • PA is the discharge-side pressure of the pump 2 at the maximum flow rate
  • PB is the discharge-side pressure of the pump 2 during the shut-off operation of the pump 2 (that is, when the flow rate is 0).
  • the curve indicated by the symbol N MAX is a performance curve of the pump 2 when the pump 2 is operated at the rotational speed N MAX that can achieve the pressure PA at the maximum flow rate
  • the curve indicated by the symbol N MIN is FIG. 6 is a performance curve of the pump 2 when the pump 2 is operated at a rotational speed (deadline rotational speed) N MIN at which the pressure PB can be achieved at a flow rate of 0.
  • the target pressure control curve R is a curve determined on the basis of the sum of the pipe loss depending on the maximum head of the building, the pressure required to use the water supply device, and the flow rate.
  • the target pressure control curve R is a curve used for performing constant control of the estimated terminal pressure, and is generally a quadratic curve.
  • the target pressure control curve R represents the relationship between the discharge flow rate of the pump 2 and the target pressure of the pump 2.
  • the pump 2 is operated at an operating point that is an intersection of the performance curve N and the target pressure control curve R.
  • Ps shown in FIG. 4 is a starting pressure which is a threshold value for starting the pump 2.
  • the starting pressure Ps is set between the pressure PB and the pressure PA.
  • the control unit 40 starts the pump 2.
  • Pz shown in FIG. 4 is a minimum discharge side pressure (lift) required by the user, that is, a lower limit value of the discharge side pressure. This lower limit value Pz is determined by adding the pressure loss generated in the water supply device to the pressure required to push up water from the water supply device 1 to the water supply device at the highest position.
  • the lower limit value Pz is stored in the control unit 40 in advance.
  • the lower limit value Pz may be changed according to the usage state (use environment) of the water supply device.
  • the target pressure hereinafter referred to as the cutoff target pressure
  • the cutoff target pressure PB during the closing operation is set to a value larger than the lower limit value Pz.
  • FIG. 5 is a graph showing the change over time (pressure change curve) of the discharge side pressure measured by the pressure sensor 26.
  • the discharge side pressure fluctuates relatively large for a while due to the hunting phenomenon, but the fluctuation range of the discharge side pressure attenuates and decreases with time, and eventually.
  • the discharge side pressure is stabilized at a substantially constant value (time t5).
  • the fluctuation range means a difference between the target pressure and the minimum value of the discharge side pressure and a difference between the target pressure and the maximum value of the discharge side pressure.
  • the discharge-side pressure after stabilization is equal to or slightly higher than the target cutoff pressure PB.
  • the control unit 40 determines the minimum value PL of the discharge side pressure after the pump 2 is started as follows.
  • the value of the discharge side pressure when the change of the discharge side pressure (the slope of the tangent of the pressure change curve) first changed from a decrease (negative) to an increase (positive) (time t4), that is, after the pump 2 was started
  • the first minimum value of the discharge side pressure is determined to be the lowest value PL.
  • the control unit 40 compares the determined minimum value PL with the lower limit value Pz, and calculates a difference ⁇ P1 (absolute value) between the minimum value PL and the lower limit value Pz.
  • the control unit 40 sets the target cutoff pressure PB on the target pressure control curve R.
  • the target pressure control curve R is moved (shifted) to the low head side (low pressure side). The target pressure control curve R is thus corrected based on the difference ⁇ P1, and the operation of the pump 2 is controlled based on the corrected target pressure control curve.
  • the control unit 40 may determine whether or not the discharge side pressure is stabilized after the pump 2 is started, and may determine the minimum value PL after the discharge side pressure is stabilized (time t5). Specifically, the control unit 40 compares the discharge side pressure measured by the pressure sensor 26 with a predetermined reference value, and the state where the discharge side pressure is larger than the reference value continues for a predetermined monitoring time tc. It is determined that the discharge side pressure is stable.
  • the predetermined reference value may be the current deadline target pressure PB, or may be a value smaller than the current deadline target pressure PB. In order to determine earlier whether or not the discharge-side pressure has stabilized, it is preferable that the reference value is a value smaller than the current cutoff target pressure PB.
  • FIG. 6 is a graph showing the corrected target pressure control curve R ′.
  • the control unit 40 calculates a new deadline target pressure PB ′ by subtracting the difference ⁇ P1 from the current deadline target pressure PB, and is specified from the discharge flow rate 0 and the deadline target pressure PB ′ in the coordinate system of FIG.
  • a new target pressure control curve R ′ is determined by connecting the points specified by the maximum flow rate Q MAX and the corresponding pressure PA with a quadratic curve. As a result of such correction, almost the entire current target pressure control curve R moves (shifts) to the low head side.
  • the energy saving operation can be realized by correcting the current target pressure control curve R to the low head side.
  • the target pressure control curve may be corrected by translating the entire current target pressure control curve R by a difference ⁇ P1 toward the lower head.
  • the current target pressure control curve R may be slowly switched over to a new target pressure control curve R ′ over a predetermined transition time (for example, 10 seconds), or the current target pressure control curve at a predetermined rate of change. You may slowly switch from R to a new target pressure control curve R ′.
  • FIG. 8 is a graph showing the change over time in the discharge side pressure when the minimum value PL falls below the lower limit value Pz.
  • the control unit 40 adds the difference ⁇ P2 (absolute value) between the minimum value PL and the lower limit value Pz to the cutoff target pressure PB on the target pressure control curve R, thereby raising the target pressure control curve R to the high head.
  • ⁇ P2 absolute value
  • FIG. 9 is a graph showing the corrected target pressure control curve R ′. As shown in FIG. 9, almost the entire current target pressure control curve R is shifted to the high head side.
  • the lower limit value Pz is the minimum water supply pressure required for the water supply apparatus 1. If the water supply pressure falls below the lower limit value Pz, there is a possibility that water cannot be supplied to the entire building. Therefore, when the minimum value PL is smaller than the lower limit value Pz, the control unit 40 ensures a sufficient water supply pressure by correcting the current target pressure control curve R to the high head side. As described above, the control unit 40 can ensure a sufficient supply water pressure even when the energy saving operation is executed in accordance with the operation state of the pump 2.
  • the target pressure control curve greatly affects the discharge pressure of the pump 2, frequent correction of the target pressure control curve R may make the discharge pressure of the pump 2 unstable. Therefore, in order to avoid frequent correction (switching) of the target pressure control curve R, a dead zone for the minimum value PL may be provided.
  • FIG. 10 is a graph showing a dead zone in which the correction of the target pressure control curve R is not allowed.
  • the dead zone DZ is set for the minimum value PL of the discharge side pressure determined after the pump 2 is started. That is, when the minimum value PL is in the dead zone DZ, the control unit 40 does not correct the target pressure control curve R.
  • the lower limit value of the dead zone DZ is Pz
  • the upper limit value is Pz + P add . That is, when the minimum value PL is equal to or less than Pz + P add and equal to or greater than Pz, the control unit 40 does not correct the target pressure control curve R.
  • the dead zone DZ is preferably equal to or higher than the lower limit value Pz of the discharge side pressure. This is because if the dead zone DZ is set lower than the lower limit value Pz, the water supply apparatus 1 may not be able to supply water to the entire building. Depending on the usage environment of the water supply apparatus 1, the dead zone DZ may be a range including the lower limit value Pz.
  • the control unit 40 corrects the target pressure control curve based on the difference ⁇ P1 or ⁇ P2 between the minimum value PL and the lower limit value Pz after determining or simultaneously with determining the minimum value PL as described above. By correcting the target pressure control curve in this way, it is possible to obtain an optimum target pressure control curve corresponding to the operation state of the pump even when energy saving operation is realized.
  • FIG. 11 is a flowchart showing a pump control operation executed by the control unit 40.
  • the control unit 40 determines whether or not the pump 2 is rotating, and when the pump 2 is rotating, next determines whether or not the pump 2 is immediately after starting.
  • the control unit 40 determines whether or not the discharge side pressure has reached the first minimum value. If it is determined that the first minimum value has been reached, the control unit 40 determines that minimum value as the minimum value PL. Thereafter, the control unit 40 determines whether or not the target pressure control curve R described above needs to be corrected.
  • the control unit 40 determines whether or not the discharge side pressure is stable, and gradually switches from the current target pressure control curve R to the corrected target pressure control curve R ′ ( Change).
  • the control unit 40 controls the pump 2 based on the corrected target pressure control curve R ′.
  • FIG. 12 is a flowchart showing another control operation of the pump executed by the control unit 40. This flowchart is the same as the flowchart of FIG. 11 described above until the determination immediately after the pump 2 is started.
  • the control unit 40 determines whether or not the discharge side pressure is stable, and determines the minimum value PL if the discharge side pressure is stable.
  • the control unit 40 does not correct the target pressure control curve R when the minimum value PL is equal to the lower limit value Pz or when the minimum value PL is in the dead zone DZ, and otherwise the target pressure control curve R is not corrected. Correct. When correcting the target pressure control curve R, the control unit 40 gradually switches (changes) the current target pressure control curve R to the corrected target pressure control curve R ′. After correcting the target pressure control curve, the control unit 40 performs control based on the corrected target pressure control curve R ′.
  • the target pressure control curve R is set after the pump 2 has started a plurality of times. It may be corrected. For example, even when the control unit 40 determines to correct the target pressure control curve R every time the pump 2 is started, the control unit 40 does not correct the determination regardless of the determination result, and sets the minimum value PL and the predetermined lower limit value of the discharge side pressure. These differences may be recorded (saved) for one time or a plurality of times and corrected based on the recorded results.
  • the control unit 40 stores the difference ⁇ P1 between the minimum value PL and the lower limit value Pz without correcting the target pressure control curve R. Further, the control unit 40 obtains and stores a plurality of differences ⁇ P1 by calculating and storing the difference ⁇ P1 every time the pump 2 is started on condition that the minimum value PL is larger than the lower limit value Pz. The average value of the plurality of differences ⁇ P1 is calculated, and the target pressure control curve R is corrected by subtracting the average value of the differences ⁇ P1 from the target pressure PB at the pump cutoff operation on the target pressure control curve R.
  • the control unit 40 immediately corrects the target pressure control curve R by adding the difference ⁇ P2 between the minimum value PL and the lower limit value Pz to the target pressure PB as described above. May be. That is, when the minimum value PL is larger than the lower limit value Pz, the difference ⁇ P1 is stored as described above. When the minimum value PL is smaller than the lower limit value Pz and the difference ⁇ P2 is calculated, the above-described correction may be performed immediately in exceptional cases.
  • the target pressure control curve R may be corrected after a predetermined time of the pump 2 elapses. More specifically, when the minimum value PL is larger than the lower limit value Pz, the control unit 40 calculates the difference ⁇ P1 between the minimum value PL and the lower limit value Pz without correcting the target pressure control curve R for a predetermined time. Saved every time the pump is started in the meantime, calculates the average of the stored difference ⁇ P1, and subtracts the average of the difference ⁇ P1 from the target pressure PB at the pump cutoff operation on the target pressure control curve R, The pressure control curve R is corrected. When the minimum value PL is smaller than the lower limit value Pz, the control unit 40 immediately corrects the target pressure control curve R by adding the difference ⁇ P2 between the minimum value PL and the lower limit value Pz to the target pressure PB as described above. May be.
  • the predetermined time is set to 24 hours, for example.
  • the target pressure control curve R is corrected based on the operation status of the pump 2 on the previous day. Since the correction of the target pressure control curve R is performed only once a day, frequent fluctuations in the feed water pressure are avoided.
  • the target pressure control curve R is calculated using the difference at the time of the one pump start. Can be corrected. Further, when the pump 2 is started once or zero times within a predetermined time, that is, when the pump 2 continues to start or stops, the target pressure control curve R is corrected. It does not have to be done.
  • the target pressure control curve R may be corrected based on all the differences ⁇ P1 and ⁇ P2 calculated during a predetermined time. Further, the target pressure control curve R may be corrected based on the average of all the differences ⁇ P1 and ⁇ P2. More specifically, the control unit 40 stores the differences ⁇ P1 and ⁇ P2 between the minimum value PL and the lower limit value Pz every time the pump 2 is started for a predetermined time, and the minimum value PL is lower than the lower limit value Pz.
  • a first average value (absolute value) that is an average of the difference ⁇ P1 when the difference is large is calculated
  • a second average value (absolute value) that is an average of the difference ⁇ P2 when the minimum value PL is smaller than the lower limit value Pz is calculated.
  • the correction value is calculated by subtracting the second average value from the first average value, and the target value PB is subtracted from the target pressure PB at the pump cutoff operation on the target pressure control curve R.
  • the pressure control curve R is corrected.
  • This correction value is a positive value or a negative value. That is, when the first average value is larger than the second average value, the correction value is a positive value, and when the first average value is smaller than the second average value, the correction value is a negative value. It becomes. Therefore, by subtracting the correction value from the target pressure PB, the target pressure control curve R is corrected to either the low head side or the high head side.
  • the control unit 40 corrects the target pressure control curve R based on the average of the differences ⁇ P1 and ⁇ P2 calculated during a predetermined time.
  • the control unit 40 The difference ⁇ P1, ⁇ P2 is calculated and stored each time the pump 2 is started until the number of start reaches a predetermined number, and the target pressure control curve is performed according to the above example based on the average of all the stored differences ⁇ P1, ⁇ P2. R may be corrected.
  • FIG. 13 is a schematic view of a pump device according to another embodiment of the present invention.
  • elements corresponding to the respective components shown in FIG. 13 are identical to FIG. 13 in FIG. 13 in FIG. 13 in FIG. 13 .
  • This pump device includes a pump 2 for transferring a liquid, a motor 3 connected to the pump 2, an inverter 20 as a driving device for driving the motor 3 at a variable speed, and two supports for connecting the motor 3 and the inverter 20. And a member 44.
  • the inverter 20 is disposed adjacent to the motor 3, and the control unit 40 is disposed inside the inverter 20.
  • the check valve 22, the flow switch 24, and the pressure tank 28 shown in FIG. 3 are omitted without being described.
  • the pump 2 is driven by the motor 3 and sucks liquid from the suction port 2a, pressurizes it, and discharges it from the discharge port 2b.
  • An example of the pump 2 is a centrifugal pump, but other types of pumps may be used.
  • FIG. 14 is a plan view of the pump device shown in FIG.
  • a cooling fan 43 is disposed above the motor 3, and this cooling fan 43 is connected to the rotating shaft 10 of the motor 3. Therefore, the cooling fan 43 rotates integrally with the rotating shaft 10 of the motor 3.
  • the cooling fan 43 is a centrifugal fan that discharges gas outward in the radial direction.
  • a guide cover 45 that covers the cooling fan 43 is provided on the motor 3.
  • the guide cover 45 has a role of guiding the gas flow generated by the rotation of the cooling fan 43 to the inverter 20. In FIG. 14, the guide cover 45 is drawn with a virtual line.
  • FIG. 15A is a side view showing the guide cover 45
  • FIG. 15B is a view of the guide cover 45 shown in FIG. 15A as viewed from below.
  • the guide cover 45 includes a flat portion 45a having a gas intake hole (air intake hole) 45c and a side portion 45b having a U-shape when viewed from below.
  • the surrounding gas generally air
  • a gap is formed between the guide cover 45 and the motor 3 when viewed from the axial direction of the motor 3. A part of the airflow generated by the rotation of the cooling fan 43 flows on the outer peripheral surface of the motor 3 through this gap to cool the motor 3.
  • the two support members 44 are separated from each other, and a space serving as a passage for the airflow sent from the cooling fan 43 is formed between the support members 44.
  • the inverter 20 is cooled by the airflow that flows on the outer surface thereof. Further, the airflow flowing through the space between the motor 3 and the inverter 20 can simultaneously cool the motor 3.
  • a pressure sensor 26 is disposed at the discharge port 2b of the pump 2.
  • the pressure sensor 26 measures the discharge-side pressure of the pump 2 and transmits the measured value to the control unit 40.
  • the control unit 40 determines the minimum value PL of the discharge side pressure after the start of the pump 2, calculates the difference between the minimum value PL and the predetermined lower limit value Pz, and based on the difference Correct the target pressure control curve.
  • FIG. 16 is a diagram illustrating a configuration example of the control unit (control device) 40 illustrated in FIGS. 3 and 13. Although FIG. 16 shows the water supply apparatus, the configuration of the control unit 40 in FIG. 16 is also applicable to the control unit 40 shown in FIG.
  • control unit (control device) 40 includes a setting unit 46, a storage unit 47, a calculation unit 48, a display unit 49, an I / O unit 50, and an operation panel 51.
  • the setting unit 46 and the display unit 49 are provided on the operation panel 51.
  • the operation panel 51 includes a setting unit 46 and a display unit 49.
  • the operation panel 51 includes a switch, an input confirmation buzzer, and an input confirmation display, and functions as a human interface.
  • the setting unit 46 includes various setting values for creating the target pressure control curve R, for example, the discharge-side pressure PB of the pump 2 when the pump 2 is closed (that is, when the flow rate is 0), and the discharge-side pressure of the pump 2 when the maximum flow rate PA etc. are input. Further, the setting unit 46 generates various set values for correcting the target pressure control curve R at the pressure required to push up water from the water supply device 1 to the water supply device at the highest position.
  • Change pattern of the pressure change curve for setting the timing for determining the lower limit value Pz of the discharge side pressure determined by adding the pressure loss and the minimum value PL of the discharge side pressure after starting the pump (the slope of the tangent is Pattern of change from negative to positive), input of monitoring time tc of pressure change, monitoring time (predetermined time) for setting timing for correcting the target pressure control curve R, minimum value PL and lower limit value Pz
  • the number of times and time for storing the difference, the set value of the dead zone of the lower limit value Pz, and the transition time or change rate when switching the target pressure control curve R are input.
  • Data input to the setting unit 46 is stored in the storage unit 47.
  • the operation panel 51 may be equipped with an operation panel arithmetic unit using a CPU. This type of operation panel 51 can perform data communication between the setting unit 46, the display unit 49, and the calculation unit 48 via the I / O unit 50.
  • the display unit 49 functions as a human interface, and various data such as set values stored in the storage unit 47, the current operation state (operation state) of the pump 2, for example, operation or stop of the pump 2, operation frequency, Displays current, discharge pressure, inflow pressure (in case of direct water supply), water tank alarm, etc.
  • the storage unit 47 a memory such as a RAM is used.
  • the storage unit 47 stores the control program and various data shown in the control flowcharts of FIGS. 11 and 12, for example, the calculation result data in the calculation unit 48 (the minimum value PL of the discharge side pressure, the difference between the minimum value PL and the lower limit Pz , Operation time, integrated value, etc.), pressure value (discharge pressure, inflow pressure), data input by the setting unit 46, and input by the I / O unit 50 or output by the I / O unit 50 Data etc. are stored.
  • the calculation result data in the calculation unit 48 the minimum value PL of the discharge side pressure, the difference between the minimum value PL and the lower limit Pz , Operation time, integrated value, etc.
  • pressure value discharge pressure, inflow pressure
  • data input by the setting unit 46 and input by the I / O unit 50 or output by the I / O unit 50 Data etc.
  • the I / O unit 50 As the I / O unit 50, a port or the like is used.
  • the I / O unit 50 receives the output value of the discharge side pressure sensor 26 and the signal of the flow switch 24 and sends it to the calculation unit 48.
  • the I / O unit 50 also performs input / output of signals in communication.
  • the CPU is used as the calculation unit 48.
  • the calculation unit 48 determines the minimum value PL, calculates the difference, and measures time (operating time, Stop time), integration calculation (integration value), communication data processing, target pressure calculation, frequency command value calculation, target pressure control curve correction, and the like.
  • An output from the calculation unit 48 is input to the I / O unit 50.
  • the I / O unit 50 and the inverter 20 are connected to each other by communication means such as RS485, and various setting values, frequency command values, start / stop signals (operation / stop signals) are transmitted from the I / O unit 50 to the inverter 20.
  • a control signal such as an actual frequency value or current value is sequentially sent from the inverter 20 to the I / O unit 50.
  • An analog signal and / or a digital signal can be used as a control signal transmitted and received between the I / O unit 50 and the inverter 20.
  • an analog signal can be used for the rotation frequency or the like, and a digital signal can be used for the operation stop command or the like.
  • the present invention can be used for a pump device suitably used as a water supply device for supplying water to a building.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

La présente invention se rapporte à un dispositif de pompe qui convient pour être utilisé comme dispositif d'alimentation en eau qui alimente en eau un bâtiment. Le dispositif de pompe comprend une pompe (2), un moteur (3) qui entraîne la pompe (2), un dispositif d'entraînement (20) qui entraîne le moteur (3) à une vitesse variable et une unité de commande (40) qui démarre la pompe (2) lorsque la pression de refoulement a diminué à une pression de démarrage prescrite, et commande le dispositif d'entraînement (20) de telle sorte que la pression de refoulement atteigne une pression cible sur une courbe de commande de pression cible. L'unité de commande (40) détermine une valeur minimale (PL) pour la pression de refoulement après que la pompe (2) a démarré, et calcule la différence (ΔP1) entre la valeur minimale (PL) et une valeur de limite inférieure prescrite (Pz) pour la pression de refoulement, et corrige la courbe de commande de pression cible (R) sur la base de la différence (ΔP1).
PCT/JP2014/061247 2013-04-26 2014-04-22 Dispositif de pompe WO2014175248A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP14788422.5A EP2990652A4 (fr) 2013-04-26 2014-04-22 Dispositif de pompe
CN201480022655.7A CN105121858B (zh) 2013-04-26 2014-04-22 泵装置
KR1020157032925A KR20160002957A (ko) 2013-04-26 2014-04-22 펌프 장치

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2013-094552 2013-04-26
JP2013094552A JP6133672B2 (ja) 2013-04-26 2013-04-26 ポンプ装置
JP2013095808A JP6133676B2 (ja) 2013-04-30 2013-04-30 ポンプ装置
JP2013-095808 2013-04-30

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WO2014175248A1 true WO2014175248A1 (fr) 2014-10-30

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KR (1) KR20160002957A (fr)
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WO (1) WO2014175248A1 (fr)

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US11018610B2 (en) 2017-01-27 2021-05-25 Franklin Electric Co., Inc. Motor drive system and method
EP3422122B1 (fr) * 2017-06-29 2022-09-28 Grundfos Holding A/S Module de formation de modèles pour créer un modèle de commande du système de régulation de pression d'un réseau d'alimentation en eau

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JPH08277782A (ja) * 1995-04-04 1996-10-22 Ebara Corp 可変速給水装置
JP2000018167A (ja) * 1998-07-03 2000-01-18 Teral Kyokuto Inc 給水装置のポンプ始動制御装置
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EP2990652A1 (fr) 2016-03-02
EP2990652A4 (fr) 2016-12-28
KR20160002957A (ko) 2016-01-08
CN105121858B (zh) 2017-03-08
CN105121858A (zh) 2015-12-02

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