CN105121858A - Pump device - Google Patents
Pump device Download PDFInfo
- Publication number
- CN105121858A CN105121858A CN201480022655.7A CN201480022655A CN105121858A CN 105121858 A CN105121858 A CN 105121858A CN 201480022655 A CN201480022655 A CN 201480022655A CN 105121858 A CN105121858 A CN 105121858A
- Authority
- CN
- China
- Prior art keywords
- pump
- goal pressure
- controlling curve
- difference
- pressure controlling
- 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.)
- Granted
Links
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
- 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
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
The present invention pertains to a pump device suitable for use as a water supply device that supplies water to a building. The pump device is equipped with a pump (2), a motor (3) that drives the pump (2), a drive device (20) that drives the motor (3) at a variable speed, and a control unit (40) that starts the pump (2) when the discharge pressure has decreased to a prescribed starting pressure, and controls the drive device (20) such that the discharge pressure achieves a target pressure on a target pressure control curve. The control unit (40) determines a minimum value (PL) for the discharge pressure after the pump (2) has started, and calculates the difference (delta P1) between the minimum value (PL) and a prescribed lower limit value (Pz) for the discharge pressure, and corrects the target pressure control curve (R) on the basis of the difference (delta P1).
Description
Technical field
The present invention relates to the pump-unit that liquid is carried, particularly relate to the pump-unit being preferably used as the water supply installation supplying feedwater to building.
Background technique
Pump-unit is widely used as to building for the water supply installation fed water.Fig. 1 is the schematic diagram that common water supply installation is shown.As shown in Figure 1, the suction port of water supply installation 100 is connected with running water pipe 4 or not shown water channel via ingress pipe 5.Be connected with water pipe 7 at the exhaust port of water supply installation 100, this water pipe 7 is communicated with the water supply utensil (such as water tap) of each layer of building.Water supply installation 100 carries out supercharging then by its supply of each water supply utensil to building to the water from running water pipe 4 or water channel.
The suction side of pump possesses with the water supply installation 100 that running water pipe 4 directly links via ingress pipe 5: pump 2; As the motor 3 of the driving source driven said pump 2; As the frequency variator 20 motor 3 being carried out to the drive unit of variable speed drive; Counter-flow-preventing device 25, it is configured at the suction side of pump 2; Pressure transducer 21, it is configured at the suction side of counter-flow-preventing device 25; Safety check 22, it is configured at the discharge side of pump 2; Pressure transducer 26, flow switch 24 and forbay 28, they are configured at the discharge side of safety check 22.These constituting components are contained in the casing (cabinet) 30 of water supply installation 100.In addition, also there is the water supply installation of the type not possessing casing 30.
Between ingress pipe 5 and water pipe 7, being provided with the ram's horns 8 carrying out for only utilizing the pressure of running water pipe 4 supplying water, ram's horns 8 being provided with safety check 23.In the present embodiment, pump 2, motor 3, safety check 22 and flow switch 24 are provided with two groups, and they are set up in parallel.In addition, the pump of more than a group or 3 groups, motor, safety check and flow switch also can be set.In direct connection water supply installation, as shown in Figure 1, the suction side of pump 2 is connected with running water pipe 4, but in the water supply installation of water receiving slot type, the suction side of pump 2 is connected with water channel via ingress pipe 5.When the water supply installation of this water receiving slot type, do not possess the counter-flow-preventing device 25 shown in Fig. 1, the pressure transducer 21 of suction side and ram's horns 8.
Safety check 22 is arranged at the discharge tube 32 be connected with the exhaust port of pump 2, is the valve for the adverse current of anti-sealing when pump 2 stops.Flow switch 24 is flow detectors that the situation being reduced to specified value to the flow of the water flowed at discharge tube 32 detects.Pressure transducer 26 is the hydraulic pressure mensuration devices for measuring discharge side pressure (that is, putting on the back pressure of water supply installation 100).Forbay 28 is the pressure vessel for keeping the discharge side pressure during pump 2 stopping.
Water supply installation 100 possesses the control device 35 controlling water supply action.Frequency variator 20, flow switch 24, pressure transducer 21, pressure transducer 26 are connected with control device 35 via signaling line.If the flow utilizing flow switch 24 to detect water outlet is reduced to specified value, then control device 35 sends instruction temporarily to improve the running speed of pump 2 to frequency variator 20, makes the running of pump 2 stop after forbay 28 carries out pressure accumulation.If discharge side pressure (hydraulic pressure in discharge tube 32) is reduced to the breakout pressure of regulation, then control device 35 sends instruction to frequency variator 20 and starts to make the running of pump 2.The breakout pressure becoming the triggering factors (trigger) that pump 2 is started is previously stored with at control device 35.
If use water under the state that pump 2 stops in building, then the discharge side pressure of pump 2 reduces.If this discharge side pressure, the i.e. output value of pressure transducer 26 are reduced to the breakout pressure of afore mentioned rules, then control device 35 makes pump 2 start.In the running of pump 2, the output value based on pressure transducer 26 carries out deduction terminal pressure constant control.
If stop using water between floors, then reduce from the flow of the water of pump 2 discharge.If the flow that flow switch 24 detects the water of self-pumping 2 is reduced to specified value, then this testing signal is sent to control device 35.Control device 35 receives this testing signal, sends instruction and the rotational speed of pump 2 is increased, till reaching the stopping pressure of regulation, then make pump 2 stop until discharge side pressure to frequency variator 20.
In deduction terminal pressure constant control, according to the drag losses at the water pipe place in building, goal pressure is suitably changed, thus be constant by the hydraulic pressure control in water supply utensil.Fig. 2 is the service performance plotted curve for the pump be described an example of deduction terminal pressure constant control.In fig. 2, transverse axis is the flow of water, and the longitudinal axis is head pressure and lift (head, head).
The discharge side pressure of the pump 2 when the PA shown in Fig. 2 is peak rate of flow, the discharge side pressure of the pump 2 of (when flow is 0) when PB is pump 2 cutout running.By symbol N
mAXthe curve represented makes pump 2 to realize the rotational speed N of pressure P A
mAXthe performance curve of the pump 2 during running, by symbol N
mINthe curve represented makes pump 2 to realize rotational speed (cutout rotational speed) N of pressure P B
mINthe performance curve of the pump 2 during running.Goal pressure controlling curve R is based on the H-Max of building, in order to use the pressure needed for water supply utensil and depend on the aggregate value of pipe arrangement loss of flow and the curve determined.This goal pressure controlling curve R is constant control in order to carry out inferring terminal pressure and the curve that uses, is generally set to quadratic curve.Goal pressure controlling curve R represents the relation of the discharge flow rate of pump 2 and the goal pressure of pump 2.Pump 2 is operated at the intersection point of performance curve N and goal pressure controlling curve R that is operation point place.
In deduction terminal pressure constant control, consider the pipe resistance of (by goal pressure controlling curve R shown in) corresponding to the flow of water and the rotational speed of control pump 2.That is, the rotational speed of output value to pump 2 based on pressure transducer 26 controls, and changes along goal pressure controlling curve R to make the discharge side pressure of pump 2.Therefore, when flow is few, pipe resistance is little, and the Dynamic response ground thus needed for pump 2 reduces, thus achieves energy-saving operation.
In the running of pump 2, the discharge side pressure of pump 2 is controlled between PA and PB.Therefore, when steady running, with N
mINabove rotational speed drives pump 2.In addition, in fig. 2, if with the mode setting pressure PB making pressure P B equal with pressure P A, then control device 35 performs head pressure constant control.In this case, control device 35 is with the rotational speed making the discharge side pressure of pump 2 remain the mode control pump 2 of PA (=PB).
Patent documentation 1: No. WO2012/099242nd, International Publication
Above-mentioned goal pressure controlling curve R is set as can supply water to the mode of the water supply utensil (such as water tap) of building with the pressure of abundance and has more than needed to a certain extent.But, as long as ensure that the flow of the water needed for reality, sometimes do not need higher pressure of supply water yet.Therefore, patent documentation 1 proposes the water supply installation can guaranteed required flow, pump can be made to operate with lower rotational speed again.According to patent documentation 1, in control device, store many objectives Stress control curve in advance, based on arbitrary objective Stress control curve, pump is controlled.Therefore, by selecting best goal pressure controlling curve from pre-prepd many objectives Stress control curve, energy-saving operation can be realized.
But the water supply installation described in patent documentation 1 is way selection goal pressure controlling curve manually, and mode manually switches, not automatically carry out selection and the switching of goal pressure controlling curve.In addition, owing to selecting used goal pressure controlling curve from the many objectives Stress control curve being pre-stored within control device, the adjustment of goal pressure controlling curve itself cannot thus be carried out according to the operational situation of water supply installation.The operational situation of water supply installation can change according to the time.Such as, in school, the use amount of water increased suddenly in the time of having a rest, then used water hardly at night.Like this, the operational situation of water supply installation can change according to time or other key factors, thus expects to be adjusted to best goal pressure controlling curve.Further, further energy-conservation in order to realize, also expect to be adjusted to best goal pressure controlling curve.
Summary of the invention
The present invention completes in view of said circumstances, and its object is to provides a kind of pump-unit, automatically can determine the goal pressure controlling curve of the best corresponding to operational situation.
To achieve these goals, the pump-unit involved by an embodiment of the invention possesses: pump; Motor, it drives said pump; Drive unit, it carries out variable speed drive to said motor; Pressure transducer, it measures the discharge side pressure of said pump; And control device, above-mentioned drive unit controls by it: when above-mentioned discharge side Pressure Drop is low to moderate the breakout pressure of regulation, said pump is started, above-mentioned discharge side pressure is made to reach goal pressure on goal pressure controlling curve, the feature of said pump device is, above-mentioned control device determines the minimum of the above-mentioned discharge side pressure after said pump startup, the difference of the lower limit of the regulation of above-mentioned minimum and above-mentioned discharge side pressure is calculated, and revises above-mentioned goal pressure controlling curve based on above-mentioned difference.
The feature of the preferred embodiment of the present invention is, when above-mentioned minimum is larger than above-mentioned lower limit, above-mentioned control device makes above-mentioned goal pressure controlling curve move to low lift side based on above-mentioned difference, revises above-mentioned goal pressure controlling curve thus.
The feature of the preferred embodiment of the present invention is, when above-mentioned minimum is larger than above-mentioned lower limit, goal pressure when above-mentioned control device is by operating from the pump cutout on above-mentioned goal pressure controlling curve deducts above-mentioned difference, revises above-mentioned goal pressure controlling curve thus.
The feature of the preferred embodiment of the present invention is, when above-mentioned minimum is less than above-mentioned lower limit, above-mentioned control device makes above-mentioned goal pressure controlling curve move to high-lift side based on above-mentioned difference, revises above-mentioned goal pressure controlling curve thus.
The feature of the preferred embodiment of the present invention is, when above-mentioned minimum is less than above-mentioned lower limit, goal pressure when above-mentioned control device is by operating to the pump cutout on above-mentioned goal pressure controlling curve adds above-mentioned difference, revises above-mentioned goal pressure controlling curve thus.
The feature of the preferred embodiment of the present invention is, when said pump starts, above-mentioned control device all calculates above-mentioned difference and obtains multiple difference, and revises above-mentioned goal pressure controlling curve based on above-mentioned multiple difference.
The feature of the preferred embodiment of the present invention is, the mean value of above-mentioned control device to above-mentioned multiple difference calculates, and based on above-mentioned multiple difference mean value and revise above-mentioned goal pressure controlling curve.
The feature of the preferred embodiment of the present invention is, in scheduled time, when said pump starts, above-mentioned control device all calculates above-mentioned difference and obtains multiple difference.
The feature of the preferred embodiment of the present invention is, till the number of starts of said pump reaches the number of times of regulation, whenever starting said pump, above-mentioned control device all calculates above-mentioned difference and obtains multiple difference.
The feature of the preferred embodiment of the present invention is, using situation larger than above-mentioned lower limit for above-mentioned minimum as condition, when said pump starts, above-mentioned control device all calculates above-mentioned difference and obtains multiple difference.
The feature of the preferred embodiment of the present invention is, above-mentioned control device based on above-mentioned multiple difference mean value and above-mentioned goal pressure controlling curve is moved to low lift side, revise above-mentioned goal pressure controlling curve thus.
The feature of the preferred embodiment of the present invention is, deducting the mean value of above-mentioned multiple difference, revising above-mentioned goal pressure controlling curve thus in goal pressure when above-mentioned control device is by operating from the pump cutout above-mentioned goal pressure controlling curve.
The feature of the preferred embodiment of the present invention is, when above-mentioned minimum is less than above-mentioned lower limit, above-mentioned control device based on above-mentioned minimum and above-mentioned lower limit difference and revise above-mentioned goal pressure controlling curve.
The feature of the preferred embodiment of the present invention is, when above-mentioned minimum is less than above-mentioned lower limit, above-mentioned control device based on above-mentioned minimum and above-mentioned lower limit difference and above-mentioned goal pressure controlling curve is moved to high-lift side, revise above-mentioned goal pressure controlling curve thus.
The feature of the preferred embodiment of the present invention is, when above-mentioned minimum is less than above-mentioned lower limit, goal pressure when above-mentioned control device operates to the pump cutout on above-mentioned goal pressure controlling curve adds the difference of above-mentioned minimum and above-mentioned lower limit, revises above-mentioned goal pressure controlling curve thus.
The feature of the preferred embodiment of the present invention is, at the appointed time, when said pump starts, above-mentioned control device all calculates above-mentioned difference and obtains multiple difference, and in above-mentioned multiple difference, mean value that is first mean value of difference when above-mentioned minimum is larger than above-mentioned lower limit calculate, and in above-mentioned multiple difference, mean value that is second mean value of difference when above-mentioned minimum is less than above-mentioned lower limit calculate, above-mentioned second mean value is deducted from above-mentioned first mean value, thus correction value is calculated, goal pressure when operating from the pump cutout above-mentioned goal pressure controlling curve deducts above-mentioned correction value, revise above-mentioned goal pressure controlling curve thus.
The feature of the preferred embodiment of the present invention is, till the number of starts of said pump reaches the number of times of regulation, when said pump starts, above-mentioned control device all calculates above-mentioned difference and obtains multiple difference, and in above-mentioned multiple difference, mean value that is first mean value of difference when above-mentioned minimum is larger than above-mentioned lower limit calculate, and in above-mentioned multiple difference, mean value that is second mean value of difference when above-mentioned minimum is less than above-mentioned lower limit calculate, above-mentioned second mean value is deducted from above-mentioned first mean value, thus correction value is calculated, goal pressure when operating from the pump cutout above-mentioned goal pressure controlling curve deducts above-mentioned correction value, revise above-mentioned goal pressure controlling curve thus.
The feature of the preferred embodiment of the present invention is, above-mentioned control device using the initial minimum of above-mentioned discharge side pressure after said pump starts as above-mentioned minimum.
The feature of the preferred embodiment of the present invention is, above-mentioned control device determines above-mentioned minimum after above-mentioned discharge side pressure stability.
The feature of the preferred embodiment of the present invention is, above-mentioned control device revises above-mentioned goal pressure controlling curve after above-mentioned discharge side pressure stability.
The feature of the preferred embodiment of the present invention is, at the state continuance that the reference value that above-mentioned discharge side pressure ratio specifies is large when the monitoring period of regulation, above-mentioned control device is judged as above-mentioned discharge side pressure stability.
The feature of the preferred embodiment of the present invention is, above-mentioned control device makes goal pressure controlling curve switch to revised goal pressure controlling curve gradually from current goal pressure controlling curve.
The feature of the preferred embodiment of the present invention is, above-mentioned control device makes goal pressure controlling curve switch to revised goal pressure controlling curve gradually from current goal pressure controlling curve within the passing time of regulation.
The feature of the preferred embodiment of the present invention is, above-mentioned control device makes goal pressure controlling curve switch to revised goal pressure controlling curve with the variance ratio of regulation gradually from current goal pressure controlling curve.
The feature of the preferred embodiment of the present invention is, above-mentioned lower limit adds the pressure loss produced at above-mentioned water supply utensil and the pressure obtained to the self-pumping apparatus lift risen till the water supply utensil being positioned at extreme higher position.
The running of control gear to said pump involved by other mode of executions of the present invention controls as follows: start said pump when the discharge side Pressure Drop of pump is low to moderate the breakout pressure of regulation, above-mentioned discharge side pressure is made to reach goal pressure on goal pressure controlling curve, the feature of above-mentioned control gear is, determine the minimum of the above-mentioned discharge side pressure after said pump startup, the difference of the lower limit of the regulation of above-mentioned minimum and above-mentioned discharge side pressure is calculated, and revises above-mentioned goal pressure controlling curve based on above-mentioned difference.
The feature of the preferred embodiment of the present invention is, all calculates above-mentioned difference and obtains multiple difference, revise above-mentioned goal pressure controlling curve based on above-mentioned multiple difference when said pump starts.
According to the present invention, based on starting the difference of the minimum of discharge side pressure and the lower limit of discharge side pressure measured after pump and automatically revise goal Stress control curve.Therefore, it is possible to obtain the goal pressure controlling curve of the best corresponding to the operational situation of pump.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that common water supply installation is shown.
Fig. 2 is the service performance plotted curve for the pump be described an example of deduction terminal pressure constant control.
Fig. 3 is an example of the pump-unit illustrated involved by an embodiment of the invention that is the schematic diagram of water supply installation.
Fig. 4 is the figure of the goal pressure controlling curve illustrated involved by an embodiment of the invention.
Fig. 5 illustrates the discharge side pressure plotted curve over time by determination of pressure sensor.
Fig. 6 illustrates the plotted curve carrying out revised goal pressure controlling curve to low lift side.
Fig. 7 is the plotted curve of other examples that revised goal pressure controlling curve is shown.
Fig. 8 illustrates the plotted curve by discharge side pressure other examples over time of determination of pressure sensor.
Fig. 9 is the plotted curve that other examples carrying out revised goal pressure controlling curve to high-lift side are shown.
Figure 10 is the plotted curve in the dead band that the correction not allowing goal pressure controlling curve is shown.
Figure 11 is the flow chart of the control action that the pump performed by control device is shown.
Figure 12 is the flow chart of other control actions that the pump performed by control device is shown.
Figure 13 is the schematic diagram of the pump-unit involved by other mode of executions of the present invention.
Figure 14 is the plan view of the pump-unit shown in Figure 13.
Figure 15 A is the side view that cover for conducting is shown.
Figure 15 B is the figure observing the cover for conducting shown in Figure 15 A from below.
Figure 16 is the figure of the structure example that control device (control gear) is shown.
Embodiment
Below, with reference to accompanying drawing, embodiments of the present invention are described.Fig. 3 is an example of the pump-unit illustrated involved by an embodiment of the invention and the schematic diagram of water supply installation.Except control device 40, the water supply installation 1 shown in Fig. 3 has the structure identical with the water supply installation 100 shown in Fig. 1, thus omits the explanation that it repeats.Fig. 4 is the figure of the goal pressure controlling curve illustrated involved by an embodiment of the invention.In the diagram, the longitudinal axis represents the discharge side pressure (lift) of pump 2, and transverse axis represents the flow of the water of discharging from pump 2.
In the diagram, the discharge side pressure of the pump 2 when PA is peak rate of flow, the discharge side pressure of the pump 2 of (when flow is 0) when PB is the cutout running of pump 2.By symbol N
mAXthe curve represented makes pump 2 can realize the rotational speed N of pressure P A when peak rate of flow
mAXthe performance curve of the pump 2 during running, by symbol N
mINthe curve represented makes pump 2 can realize rotational speed (cutout rotational speed) N of pressure P B when flow is 0
mINthe performance curve of the pump 2 during running.Goal pressure controlling curve R is based on the H-Max of building, in order to use the pressure needed for water supply utensil and depend on the aggregate value of pipe arrangement loss of flow and the curve determined.This goal pressure controlling curve R is constant control in order to carry out inferring terminal pressure and the curve that uses, is generally quadratic curve.Goal pressure controlling curve R shows the relation of the discharge flow rate of pump 2 and the goal pressure of pump 2.Pump 2 operates at the intersection point of performance curve N and goal pressure controlling curve R that is operation point place.
Ps shown in Fig. 4 is threshold value for making pump 2 start that is breakout pressure.Here, as an example, show this breakout pressure Ps and be set in example between pressure P B and pressure P A.If the discharge side Pressure Drop determined by pressure transducer 26 is low to moderate breakout pressure Ps, then control device 40 makes pump 2 start.Pz shown in Fig. 4 is the MIN discharge side pressure (lift) needed for user, i.e. the lower limit of discharge side pressure.This lower limit Pz is by determining water is added from water supply installation 1 pressure be depressed into needed for the water supply utensil being in extreme higher position the pressure loss that produces at this water supply utensil.Lower limit Pz is pre-stored within control device 40.Lower limit Pz correspondingly changes with the behaviour in service (Environmental Conditions) of water supply installation sometimes.In order to not make the head pressure of water supply installation 1 lower than lower limit Pz, goal pressure (hereinafter referred to as cutout goal pressure) PB during cutout running is set as the value larger than lower limit Pz.
Fig. 5 is the plotted curve that the discharge side pressure that measured by pressure transducer 26 (pressure history) is over time shown.If the flow being detected water outlet by flow switch 24 drops to specified value (time t1), then temporarily make the rotational speed of pump 2 raise and carry out pressure accumulation in forbay 28, then, pump 2 is stopped (time t2).In this condition, if use water by water supply utensil, then discharge side pressure sharply reduces.And, if discharge side pressure reaches breakout pressure Ps, then pump 2 is started (time t3).After pump 2 starts, before its rotational speed raises, need the time, thus discharge side pressure during extremely short in reduce, then change rising (time t4) into.
As shown in Figure 5, after pump 2 has just started, discharge side pressure is made within blink with larger amplitude fluctuation because of vibration (hunting) phenomenon, but the fluctuating range of discharge side pressure decayed along with the time, discharge side pressure is just basicly stable in steady state value (time t5) soon.Here, fluctuating range refers to the difference of the difference of the minimum of goal pressure and discharge side pressure and the maximum of goal pressure and discharge side pressure.The pressure that discharge side pressure representative after stable is equal or slightly higher than PB with cutout goal pressure PB.
After making pump 2 startup, control device 40 determines the minimum PL of discharge side pressure as follows.The change (tangent slope of pressure history) of discharge side pressure is decided to be minimum PL from the initial minimum of the discharge side pressure reduced after the value of discharge side pressure of (time t4) when (bear) changes rising (just) into, pump 2 startup at first.The minimum PL of decision and lower limit Pz compares by control device 40, and calculates the difference DELTA P1 (absolute value) of minimum PL and lower limit Pz.When minimum PL is larger than lower limit Pz, namely discharge side pressure when pump 2 start after do not drop to lower limit Pz, control device 40 deducts difference DELTA P1 from the cutout goal pressure PB goal pressure controlling curve R, makes goal pressure controlling curve R to low lift side (low-pressure side) mobile (skew) thus.In like fashion and based on difference DELTA P1, goal pressure controlling curve R is revised, based on revised goal pressure controlling curve, the running of pump 2 is controlled.
Control device 40 can judge whether discharge side pressure is stablized after pump 2 starts, and after discharge side pressure stability, determine minimum PL (time t5).Specifically, the reference value of the discharge side pressure determined by pressure transducer 26 and regulation compares by control device 40, when the state that discharge side pressure ratio reference value is large continues in the monitoring period tc specified, is judged as discharge side pressure stability.The reference value of regulation can be current cutout goal pressure PB, also can be the value less than current cut-off goal pressure PB.In order to earlier judge whether discharge side pressure is stablized, reference value is preferably the value less than current cut-off goal pressure PB.
Fig. 6 is the chart that revised goal pressure controlling curve R ' is shown.Control device 40 calculates new cutout goal pressure PB ' by deducting difference DELTA P1 from current cut-off goal pressure PB, in the system of coordinates of Fig. 6, the point utilizing quadratic curve will determine according to discharge flow rate 0 and cutout goal pressure PB ', with according to peak rate of flow Q
mAXthe point determined with corresponding pressure P A links, and determines new goal pressure controlling curve R ' thus.The result of this correction, current goal pressure controlling curve R is almost overall to be moved (skew) to low lift side.
Minimum PL refers to greatly than lower limit Pz, even if the head pressure of pump 2 declines also can realize action of supplying water fully.Therefore, it is possible to realize energy-saving operation by revising to low lift side current goal pressure controlling curve R.
As shown in Figure 7, correspondingly can move in parallel to low lift side and difference DELTA P1 and goal pressure controlling curve is revised by making current goal pressure controlling curve R entirety.
In order to avoid the fluctuation sharply of the head pressure of pump 2, preferably switch to new goal pressure controlling curve R ' gradually from current goal pressure controlling curve R.Such as, can switch to new goal pressure controlling curve R ' lentamente from current goal pressure controlling curve R within the passing time (such as 10 seconds) of regulation, or also can switch to new goal pressure controlling curve R ' lentamente from current goal pressure controlling curve R with the variance ratio of regulation.
Fig. 8 is the discharge side pressure plotted curve over time when illustrating that minimum PL is less than lower limit Pz.In this case, cutout goal pressure PB on control device 40 couples of goal pressure controlling curve R adds the difference DELTA P2 (absolute value) of minimum PL and lower limit Pz, revises thus to high-lift side (high pressure side) to goal pressure controlling curve R.Fig. 9 is the plotted curve that revised goal pressure controlling curve R ' is shown.As shown in Figure 9, current goal pressure controlling curve R is almost overall to be offset to high-lift side.
Lower limit Pz is the MIN pressure of supply water required by water supply installation 1.If pressure of supply water is lower than this lower limit Pz, then likely cannot supply water to whole building.Therefore, when minimum PL is less than lower limit Pz, control device 40 is revised to high-lift side current goal pressure controlling curve R, guarantees sufficient pressure of supply water thus.Like this, even if when performing energy-saving operation, control device 40 also can guarantee sufficient pressure of supply water according to the operational situation of pump 2.
After determining minimum PL or decision while, control device 40 based on the following stated judged result and goal pressure controlling curve is revised.Namely, when minimum PL is larger than lower limit Pz (PL > Pz) and minimum PL is less than lower limit Pz when (PL < Pz), control device 40 is revised current goal pressure controlling curve R in the above described manner, but when minimum PL is equal with lower limit Pz (PL=Pz), goal pressure controlling curve R is not revised.
The head pressure of goal pressure controlling curve on pump 2 causes larger impact, thus for goal pressure controlling curve R to revise the head pressure making pump 2 sometimes frequently unstable.Therefore, in order to avoid the correction frequently (switching) for goal pressure controlling curve R, the dead band for minimum PL can be set.
Figure 10 is the plotted curve in the dead band that the correction not allowing goal pressure controlling curve R is shown.Start the minimum PL of the rear discharge side pressure determined for pump 2 and set this dead band DZ.That is, when minimum PL is in the DZ of dead band, control device 40 is not revised goal pressure controlling curve R.In the example shown in Figure 10, the lower limit of dead band DZ is Pz, and CLV ceiling limit value is Pz+P
add.That is, be Pz+P at minimum PL
addbelow and be more than Pz time, control device 40 is not revised goal pressure controlling curve R.By arranging this dead band DZ, the correction frequently (switching) for Stress control curve R can be avoided, thus stable water supply can be realized.
As shown in Figure 10, preferred dead band DZ is in more than the lower limit Pz of discharge side pressure.This is because: if be set as lower than lower limit Pz by dead band DZ, then water supply installation 1 likely cannot supply water to whole building.According to the difference of the Environmental Conditions of water supply installation 1, dead band DZ also can be the scope comprising lower limit Pz.
After determining minimum PL as described above or while decision, control device 40 is revised goal pressure controlling curve based on the difference DELTA P1 of above-mentioned minimum PL and lower limit Pz or Δ P2.By revising goal pressure controlling curve in like fashion, even if when realizing energy-saving operation, the goal pressure controlling curve of the best corresponding to the operational situation of pump also can be obtained.
Figure 11 is the flow chart of the control action that the pump performed by control device 40 is shown.If connect the power switch of water supply installation 1, then the control employing the pump of the initial goal pressure controlling curve being pre-stored within control device 40 starts to carry out.Next control device 40 judges whether pump 2 is rotating, when pump 2 rotates, after judging whether pump 2 is in and has just started.When pump 2 be in just start after, control device 40 judges the minimum whether discharge side pressure reaches initial.Reach initial minimum if be judged as, then this minimum determines as minimum PL by control device 40.Then, control device 40 judges the need of the above-mentioned goal pressure controlling curve R of correction.When revising goal pressure controlling curve R, control device 40 judges whether discharge side pressure is stablized, and makes it switch (change) to revised goal pressure controlling curve R ' gradually from current goal pressure controlling curve R.If complete to the switching of revised goal pressure controlling curve R ', then control device 40 controls pump 2 based on revised goal pressure controlling curve R '.
Figure 12 is the flow chart of other control actions that the pump performed by control device 40 is shown.Till judgement after pump 2 has just started, this flow chart is identical with the flow chart of above-mentioned Figure 11.When pump 2 be in just start after, control device 40 judges whether discharge side pressure is stablized, if discharge side pressure stability, determines minimum PL.
When minimum PL is equal with lower limit Pz or minimum PL is in the DZ of dead band, control device 40 is not revised goal pressure controlling curve R, and when in addition, control device 40 couples of goal pressure controlling curve R revise.When revising goal pressure controlling curve R, control device 40 makes it switch (change) to revised goal pressure controlling curve R ' gradually from current goal pressure controlling curve R.After the correction of goal pressure controlling curve, control device 40 controls based on revised goal pressure controlling curve R '.
In order to avoid the correction frequently (switching) for goal pressure controlling curve, also can replace mode that above-mentioned dead band DZ is set or on the basis that dead band DZ is set, after pump 2 starts repeatedly, goal pressure controlling curve R be revised.Such as, control device 40 can be formed as: though carry out whether when pump 2 starts all to the judgement that goal pressure controlling curve R revises, also no matter how its judged result is not revised, to difference record (preservation) one or many of the lower limit of the regulation of minimum PL and discharge side pressure, and based on record result and revise.More specifically, when minimum PL is larger than lower limit Pz, control device 40 is not revised goal pressure controlling curve R, but preserves the difference DELTA P1 of minimum PL and lower limit Pz.And, control device 40 using situation larger than lower limit Pz for minimum PL as condition, all difference DELTA P1 calculated when pump 2 starts and preserve, obtain multiple difference DELTA P1 thus, the mean value of preserved multiple difference DELTA P1 is calculated, and goal pressure PB when operating from the pump cutout goal pressure controlling curve R deducts the mean value of difference DELTA P1, revises thus to goal pressure controlling curve R.Till the number of starts of pump 2 reaches the number of times of regulation, repeat calculating and the preservation of above-mentioned difference DELTA P1.When minimum PL is less than lower limit Pz, control device 40 can add the difference DELTA P2 of minimum PL and lower limit Pz as described above to goal pressure PB, revise immediately thus to goal pressure controlling curve R.That is, when minimum PL is larger than lower limit Pz, as described above difference DELTA P1 is preserved.Less and when calculating difference DELTA P2, above-mentioned correction can be carried out immediately exceptionally than lower limit Pz at minimum PL.Even if the difference DELTA P1 preserved before this once () does not also exist or exists once or twice, also revise based on difference DELTA P2 exceptionally.So, when contingency makes the possibility of cutting off the water supply raise because goal pressure controlling curve to the skew of low lift side, it also can be made to switch to high-lift side, thus more stable water supply can be realized.
Above-mentioned example can be replaced and in stipulated time of pump 2 through revising goal pressure controlling curve R afterwards.More specifically, when minimum PL is larger than lower limit Pz, control device 40 is not revised goal pressure controlling curve R, but all the difference DELTA P1 of minimum PL and lower limit Pz is preserved whenever making said pump start in scheduled time, the mean value of preserved difference DELTA P1 is calculated, and goal pressure PB when operating from the pump cutout goal pressure controlling curve R deducts the mean value of difference DELTA P1, revises thus to goal pressure controlling curve R.When minimum PL is less than lower limit Pz, control device 40 can be revised goal pressure controlling curve R by adding the difference DELTA P2 of minimum PL and lower limit Pz to goal pressure PB as described above immediately.
The above-mentioned stipulated time is such as set as 24 hours.In this case, based on the pump 2 of the day before yesterday operational situation and goal pressure controlling curve R is revised.Because the correction of goal pressure controlling curve R was only carried out once in one day, so avoid the fluctuation frequently of pressure of supply water.
In addition, even if having passed through scheduled time, when the number of starts of pump 2 is at the appointed time only once, difference during this pump startup once also can be used to revise goal pressure controlling curve R.In addition, the startup of pump 2 at the appointed time once do not carry out yet but zero degree when, namely when pump 2 continues to start or continue to stop, also can not carrying out the correction of goal pressure controlling curve R.
No matter minimum PL is greater than or is less than lower limit Pz, can revise based on the whole difference DELTA P1 calculated at the appointed time, Δ P2 to goal pressure controlling curve R.In addition, also can revise goal pressure controlling curve R based on the mean value of all these difference DELTA P1, Δ P2.More specifically, in scheduled time, whenever making pump 2 start, control device 40 is all to the difference DELTA P1 of minimum PL and lower limit Pz, Δ P2 preserves, mean value that is first mean value (absolute value) of difference DELTA P1 time larger than lower limit Pz to minimum PL calculate, mean value that is second mean value (absolute value) of difference DELTA P2 time less than lower limit Pz to minimum PL calculate, by deducting the second mean value from the first mean value, correction value is calculated, goal pressure PB when operating from the pump cutout goal pressure controlling curve R deducts correction value, thus goal pressure controlling curve R is revised.This correction value be on the occasion of or negative value.That is, when the first mean value is larger than the second mean value, correction value be on the occasion of, when the first mean value is less than the second mean value, correction value is negative value.Therefore, deduct correction value from goal pressure PB, the either side thus to low lift side or high-lift side is revised goal pressure controlling curve R.
In the above example, control device 40 based on the difference DELTA P1 calculated at the appointed time, Δ P2 mean value and goal pressure controlling curve R is revised, but, as other examples, can be configured to: till the number of starts of pump 2 reaches the number of times of regulation, whenever making pump 2 start, control device 40 all calculates difference DELTA P1, Δ P2 and preserves, based on preserved whole difference DELTA P1, Δ P2 mean value and according to above-mentioned example, goal pressure controlling curve R is revised.
Above-mentioned mode of execution is example pump-unit of the present invention being applied to water supply installation, but the present invention can also be applied to the pump-unit beyond water supply installation.Such as, the frequency variator that can also apply the present invention to as shown in Figure 13 is fixed on the integrated pump device of the side of motor.Figure 13 is the schematic diagram of the pump-unit involved by other mode of executions of the present invention.In fig. 13, identical to the element annotation corresponding with each constituting component shown in Fig. 3 reference character.
This pump-unit possesses: pump 2, and it is carried liquid; Motor 3, itself and pump 2 link; As the frequency variator 20 motor 3 being carried out to the drive unit of variable speed drive; And two support units 44, motor 3 and frequency variator 20 link by they.Frequency variator 20 and motor 3 are adjacent to configure, and control device 40 is configured at the inside of frequency variator 20.In the pump-unit shown in Figure 13, do not record the safety check 22 shown in Fig. 3, flow switch 24 and forbay 28, but they are omitted.
Pump 2 is driven by motor 3, and it sucks liquid and to this liquid pressing, then it discharged from exhaust port 2b from suction port 2a.Although as pump 2 example and enumerated centrifugal pump, also can use other forms of pump.
Figure 14 is the plan view of the pump-unit shown in Figure 13.Be configured with cooling fan 43 on the top of motor 3, this cooling fan 43 links with the running shaft 10 of motor 3.Therefore, cooling fan 43 rotates integrally with the running shaft 10 of motor 3.Cooling fan 43 is the centrifugal fans of being discharged to radial outside by gas.The cover for conducting 45 covered by cooling fan 43 is arranged on motor 3.The effect that the air-flow that this cover for conducting 45 has the gas rotation by cooling fan 43 produced guides to frequency variator 20.In fig. 14, cover for conducting 45 is described with imaginary line.
Figure 15 A is the side view that cover for conducting 45 is shown, Figure 15 B is the figure observing the cover for conducting 45 shown in Figure 15 A from below.Cover for conducting 45 has: planar surface portion 45a, and it has gas and is taken into hole (air is taken into hole) 45c; And sidepiece 45b, it has the shape of U-shaped when observing from below.Along with the rotation of cooling fan 43, gas (being generally air) is around taken into hole 45c from gas and flow in cover for conducting 45, and along cover for conducting 45 sidepiece 45b and be transported to frequency variator 20.As shown in figure 14, when from the end on observation of motor 3, between cover for conducting 45 and motor 3, gap is formed with.A part for the air-flow produced by the rotation of cooling fan 43 is passed through from this gap and is flowed at the outer circumferential face of motor 3 and cooled by motor 3.
Two support units 44 are separated from each other, and are formed with the space of the path becoming the air-flow carried from cooling fan 43 between above-mentioned support unit 44.Frequency variator 20 is cooled by the air-flow flowed on its outer surface.In addition, the air-flow of the spatial flow between motor 3 and frequency variator 20 can also cool motor 3 simultaneously.
Pressure transducer 26 is configured with at the exhaust port 2b of pump 2.The discharge side pressure of this pressure transducer 26 pairs of pumps 2 measures, and its measured load is sent to control device 40.Identical with above-mentioned mode of execution, control device 40 determines the minimum PL of discharge side pressure after pump 2 starts, and calculates, and revise goal pressure controlling curve based on this difference the difference of the lower limit Pz of minimum PL and regulation.
Figure 16 is the figure of the structure example that the control device (control gear) 40 shown in Fig. 3 and Figure 13 is shown.Figure 16 illustrates water supply installation, and the structure of the control device 40 of Figure 16 also can be applied to the control device 40 shown in Figure 13.
As shown in figure 16, control device (control gear) 40 possesses configuration part 46, memory section 47, operational part 48, display unit 49, I/O portion 50 and running panel 51.Configuration part 46 and display unit 49 are arranged at running panel 51.
Running panel 51 has configuration part 46 and display unit 49, such as, have switch, input validation buzzer and input validation display unit, and play function as man-machine interface.Configuration part 46 is inputted to the various setting values making goal pressure controlling curve R, the discharge side pressure P A etc. of the pump 2 such as, during the cutout running of pump 2 during discharge side pressure P B, the peak rate of flow of the pump 2 of (when flow is 0).In addition, as the various setting values for revising goal pressure controlling curve R, input by the lower limit Pz in order to water to be added the pressure loss produced at this water supply utensil and the discharge side pressure determined from water supply installation 1 pressure be depressed into needed for the water supply utensil being positioned at extreme higher position to configuration part 46, for the changing pattern (pattern that tangent slope is just changing from negative sense) of the pressure history that the moment of the minimum PL to the discharge side pressure after decision pump startup sets, the input of the monitoring period tc of pressure change, for setting the monitoring period (stipulated time) to the moment that goal pressure controlling curve R revises, store number of times and the time of the difference of minimum PL and lower limit Pz, the setting value in the dead band of lower limit Pz, and switch goal pressure controlling curve R time the passing time or variance ratio.The data inputing to configuration part 46 are stored in memory section 47.In addition, alternatively, the panel 51 that operates also can be equipped with the running panel operational part employing CPU.The running panel 51 of the type can carry out configuration part 46 and the data communication between display unit 49 and operational part 48 via I/O portion 50.
Display unit 49 plays function as man-machine interface, shows being stored in the various data of setting value etc. of memory section 47, the running of the operational situation (operating condition) of current pump 2, such as pump 2 or stopping, operating frequency, electric current, head pressure, feed pressure (directly link supply water when), water channel alarm etc.
The storagies such as RAM are used as memory section 47.Store the control program shown in control flow chart of Figure 11, Figure 12, various data at memory section 47, the data (the minimum PL of discharge side pressure, the difference, running time, aggregate-value etc. of minimum PL and lower limit Pz) of such as, operation result in operational part 48, force value (head pressure, feed pressure), utilize configuration part 46 and the data inputted and the data etc. utilizing I/O portion 50 to input or utilize I/O portion 50 to export.
Port etc. is used as I/O portion 50.I/O portion 50 accepts the output value of discharge side pressure transducer 26, the signal of flow switch 24 they are delivered to operational part 48.I/O portion 50 also carries out the input output of the signal communicated.
CPU is used as operational part 48.Operational part 48 carries out the correction etc. of the decision of minimum PL, the computing of difference, the measurement of time (running time, stop time), accumulative computing (aggregate-value), the process of communication data, the computing of goal pressure, the computing of frequency instruction value and goal pressure controlling curve based on being stored in the program of memory section 47 and various data and the signal that inputs from I/O portion 50.Output from operational part 48 is input to I/O portion 50.
In addition, I/O portion 50 and frequency variator 20 are interconnected by communication units such as RS485, carry the control signal such as various setting value, frequency instruction value, startup stop signal (running, stop signal) from I/O portion 50 to frequency variator 20, and transmit the operational situation (operating condition) of actual frequency values, current value etc. from frequency variator 20 to I/O portion 50 successively.
In addition, as the control signal of transmission and reception between I/O portion 50 and frequency variator 20, analogue signal and/or digital signal can be used.Such as, analogue signal can be used for speed etc., can digital signal be used for running halt instruction etc.
Above-mentioned mode of execution is to make the people of the general knowledge had in the technical field of the invention can implement to record for the purpose of the present invention.Those skilled in the art can realize the various variation of above-mentioned mode of execution certainly, and technological thought of the present invention can also be applied to other mode of executions.Therefore, the present invention is not limited to described mode of execution, should be set to the widest scope met by technological thought as defined in the claims.
Utilizability in industry
The present invention can be used in the pump-unit being preferably used as the water supply installation supplying feedwater to building.
Description of reference numerals:
1,100 ... water supply installation; 2 ... pump; 3 ... motor; 8 ... ram's horns; 10 ... running shaft; 20 ... frequency variator; 21 ... pressure transducer; 22,23 ... safety check; 24 ... flow switch; 25 ... counter-flow-preventing device; 26 ... pressure transducer; 28 ... forbay; 35,40 ... control device; 43 ... cooling fan; 44 ... support unit; 45 ... cover for conducting; 46 ... configuration part; 47 ... memory section; 48 ... operational part; 49 ... display unit; 50 ... I/O portion; 51 ... running panel.
Claims (27)
1. a pump-unit, it possesses:
Pump;
Motor, it drives described pump;
Drive unit, it carries out variable speed drive to described motor;
Pressure transducer, it measures the discharge side pressure of described pump; And
Control device, its described drive unit is controlled be: start described pump when described discharge side Pressure Drop is low to moderate the breakout pressure of regulation, make described discharge side pressure reach goal pressure on goal pressure controlling curve,
The feature of described pump-unit is,
Described control device determines the minimum of the described discharge side pressure after described pump startup,
The difference of the lower limit of the regulation of described minimum and described discharge side pressure is calculated,
And revise described goal pressure controlling curve based on described difference.
2. pump-unit according to claim 1, is characterized in that,
When described minimum is larger than described lower limit, described control device makes described goal pressure controlling curve move to low lift side based on described difference, revises described goal pressure controlling curve thus.
3. pump-unit according to claim 2, is characterized in that,
When described minimum is larger than described lower limit, goal pressure when described control device is by operating from the pump cutout on described goal pressure controlling curve deducts described difference, revises described goal pressure controlling curve thus.
4. the pump-unit according to any one of claims 1 to 3, is characterized in that,
When described minimum is less than described lower limit, described control device makes described goal pressure controlling curve move to high-lift side based on described difference, revises described goal pressure controlling curve thus.
5. pump-unit according to claim 4, is characterized in that,
When described minimum is less than described lower limit, goal pressure when described control device is by operating to the pump cutout on described goal pressure controlling curve adds described difference, revises described goal pressure controlling curve thus.
6. pump-unit according to claim 1, is characterized in that,
Whenever described pump startup, described control device all calculates described difference and obtains multiple difference,
Described goal pressure controlling curve is revised based on described multiple difference.
7. pump-unit according to claim 6, is characterized in that,
The mean value of described control device to described multiple difference calculates, and based on described multiple difference mean value and revise described goal pressure controlling curve.
8. the pump-unit according to claim 6 or 7, is characterized in that,
In scheduled time, whenever described pump startup, described control device all calculates described difference and obtains multiple difference.
9. the pump-unit according to any one of claim 6 ~ 8, is characterized in that,
Till the number of starts of described pump reaches the number of times of regulation, whenever described pump startup, described control device all calculates described difference and obtains multiple difference.
10. the pump-unit according to any one of claim 6 ~ 9, is characterized in that,
Situation larger than described lower limit for described minimum as condition, all calculates described difference and obtains multiple difference by described control device whenever described pump startup.
11. pump-units according to claim 10, is characterized in that,
Described control device based on described multiple difference mean value and described goal pressure controlling curve is moved to low lift side, revise described goal pressure controlling curve thus.
12. pump-units according to claim 11, is characterized in that,
Deducting the mean value of described multiple difference in goal pressure when described control device is by operating from the pump cutout described goal pressure controlling curve, revising described goal pressure controlling curve thus.
13. pump-units according to claim 11 or 12, is characterized in that,
When described minimum is less than described lower limit, described control device based on described minimum and described lower limit difference and revise described goal pressure controlling curve.
14. pump-units according to claim 13, is characterized in that,
When described minimum is less than described lower limit, described control device based on described minimum and described lower limit difference and described goal pressure controlling curve is moved to high-lift side, revise described goal pressure controlling curve thus.
15. pump-units according to claim 14, is characterized in that,
When described minimum is less than described lower limit, goal pressure when described control device operates to the pump cutout on described goal pressure controlling curve adds the difference of described minimum and described lower limit, revises described goal pressure controlling curve thus.
16. pump-units according to claim 6 or 7, is characterized in that,
In scheduled time, whenever described pump startup, described control device all calculates described difference and obtains multiple difference,
And in described multiple difference, described minimum larger than described lower limit time the mean value of difference that is the first mean value calculate,
To in described multiple difference, described minimum less than described lower limit time the mean value of difference that is the second mean value calculate,
Deduct described second mean value from described first mean value, thus correction value calculated,
Goal pressure when operating from the pump cutout described goal pressure controlling curve deducts described correction value, revises described goal pressure controlling curve thus.
17. pump-units according to claim 6 or 7, is characterized in that,
Till the number of starts of described pump reaches the number of times of regulation, whenever described pump startup, described control device all calculates described difference and obtains multiple difference,
And in described multiple difference, described minimum larger than described lower limit time the mean value of difference that is the first mean value calculate,
To in described multiple difference, described minimum less than described lower limit time the mean value of difference that is the second mean value calculate,
Deduct described second mean value from described first mean value, thus correction value calculated,
Goal pressure when operating from the pump cutout described goal pressure controlling curve deducts described correction value, revises described goal pressure controlling curve thus.
18. pump-units according to any one of claim 1 ~ 17, is characterized in that,
Described control device using the initial minimum of the described discharge side pressure after described pump startup as described minimum.
19. pump-units according to any one of claim 1 ~ 18, is characterized in that,
Described control device determines described minimum after described discharge side pressure stability.
20. pump-units according to any one of claim 1 ~ 19, is characterized in that,
Described control device revises described goal pressure controlling curve after described discharge side pressure stability.
21. pump-units according to claim 19 or 20, is characterized in that,
At the state continuance that the reference value that described discharge side pressure ratio specifies is large when the monitoring period of regulation, described control device is judged as described discharge side pressure stability.
22. pump-units according to any one of claim 1 ~ 21, is characterized in that,
Described control device makes goal pressure controlling curve switch to revised goal pressure controlling curve gradually from current goal pressure controlling curve.
23. pump-units according to claim 22, is characterized in that,
Described control device makes goal pressure controlling curve switch to revised goal pressure controlling curve gradually from current goal pressure controlling curve in the passing time range of regulation.
24. pump-units according to claim 22, is characterized in that,
Described control device makes goal pressure controlling curve switch to revised goal pressure controlling curve with the variance ratio of regulation gradually from current goal pressure controlling curve.
25. pump-units according to any one of claim 1 ~ 24, is characterized in that,
Described lower limit adds the pressure loss produced at described water supply utensil and the pressure obtained to the self-pumping apparatus lift risen till the water supply utensil being positioned at extreme higher position.
26. 1 kinds of control gear, it controls as follows to the running of described pump: start described pump when the discharge side Pressure Drop of pump is low to moderate the breakout pressure of regulation, makes described discharge side pressure reach goal pressure on goal pressure controlling curve,
The feature of described control gear is,
Determine the minimum of the described discharge side pressure after described pump startup,
The difference of the lower limit of the regulation of described minimum and described discharge side pressure is calculated,
Described goal pressure controlling curve is revised based on described difference.
27. control gear according to claim 26, is characterized in that,
All described difference calculated whenever described pump startup and obtain multiple difference,
Described goal pressure controlling curve is revised based on described multiple difference.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013094552A JP6133672B2 (en) | 2013-04-26 | 2013-04-26 | Pump device |
| JP2013-094552 | 2013-04-26 | ||
| JP2013095808A JP6133676B2 (en) | 2013-04-30 | 2013-04-30 | Pump device |
| JP2013-095808 | 2013-04-30 | ||
| PCT/JP2014/061247 WO2014175248A1 (en) | 2013-04-26 | 2014-04-22 | Pump device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105121858A true CN105121858A (en) | 2015-12-02 |
| CN105121858B CN105121858B (en) | 2017-03-08 |
Family
ID=51791820
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201480022655.7A Active CN105121858B (en) | 2013-04-26 | 2014-04-22 | Pump installation |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2990652A4 (en) |
| KR (1) | KR20160002957A (en) |
| CN (1) | CN105121858B (en) |
| WO (1) | WO2014175248A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3156656B1 (en) * | 2015-10-16 | 2020-03-25 | Grundfos Holding A/S | Pump control method and pressure increasing device |
| US10566881B2 (en) | 2017-01-27 | 2020-02-18 | Franklin Electric Co., Inc. | Motor drive system including removable bypass circuit and/or cooling features |
| EP3422122B1 (en) * | 2017-06-29 | 2022-09-28 | Grundfos Holding A/S | Model formation module for creating a model for controlling a pressure regulating system of a water supply network |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005194970A (en) * | 2004-01-09 | 2005-07-21 | Teral Kyokuto Inc | Method and device for controlling delivery pressure of pump |
| CN200979664Y (en) * | 2006-11-13 | 2007-11-21 | 长沙怡能电子科技有限公司 | An intelligent electricity-saving control system for blast and pump |
| US20080317608A1 (en) * | 2004-07-28 | 2008-12-25 | Ian Gray | Pump Control System |
| CN101372980A (en) * | 2007-08-22 | 2009-02-25 | 株式会社日立产机*** | Water feeding apparatus |
| CN201209568Y (en) * | 2008-04-22 | 2009-03-18 | 广州智光电机有限公司 | Energy-conserving high-efficiency operation control system for header pumps |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61261696A (en) * | 1985-05-15 | 1986-11-19 | Hitachi Ltd | Automatic pump device |
| JP3425269B2 (en) * | 1995-04-04 | 2003-07-14 | 株式会社荏原製作所 | Variable speed water supply |
| JP2923249B2 (en) * | 1996-08-23 | 1999-07-26 | 株式会社日立製作所 | Water supply system |
| JP3089267B2 (en) * | 1998-04-17 | 2000-09-18 | 株式会社日立製作所 | Automatic water supply apparatus and pump control method thereof |
| JP2000018167A (en) * | 1998-07-03 | 2000-01-18 | Teral Kyokuto Inc | Pump starter controller of water supply system |
| JP5291075B2 (en) * | 2004-12-03 | 2013-09-18 | 株式会社荏原製作所 | Water supply device starting method and water supply device |
| US8135529B2 (en) * | 2008-09-23 | 2012-03-13 | Delta Electronics, Inc. | Method for controlling constant-pressure fluid |
| JP5914365B2 (en) | 2011-01-21 | 2016-05-11 | 株式会社荏原製作所 | Water supply equipment |
| JP2012101136A (en) * | 2012-02-13 | 2012-05-31 | Ebara Corp | Fire pump system |
-
2014
- 2014-04-22 EP EP14788422.5A patent/EP2990652A4/en not_active Withdrawn
- 2014-04-22 KR KR1020157032925A patent/KR20160002957A/en not_active Application Discontinuation
- 2014-04-22 CN CN201480022655.7A patent/CN105121858B/en active Active
- 2014-04-22 WO PCT/JP2014/061247 patent/WO2014175248A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005194970A (en) * | 2004-01-09 | 2005-07-21 | Teral Kyokuto Inc | Method and device for controlling delivery pressure of pump |
| US20080317608A1 (en) * | 2004-07-28 | 2008-12-25 | Ian Gray | Pump Control System |
| CN200979664Y (en) * | 2006-11-13 | 2007-11-21 | 长沙怡能电子科技有限公司 | An intelligent electricity-saving control system for blast and pump |
| CN101372980A (en) * | 2007-08-22 | 2009-02-25 | 株式会社日立产机*** | Water feeding apparatus |
| CN201209568Y (en) * | 2008-04-22 | 2009-03-18 | 广州智光电机有限公司 | Energy-conserving high-efficiency operation control system for header pumps |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20160002957A (en) | 2016-01-08 |
| CN105121858B (en) | 2017-03-08 |
| WO2014175248A1 (en) | 2014-10-30 |
| EP2990652A1 (en) | 2016-03-02 |
| EP2990652A4 (en) | 2016-12-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7925385B2 (en) | Method for optimizing valve position and pump speed in a PID control valve system without the use of external signals | |
| US10409299B2 (en) | Pump controller system and method | |
| CN100425835C (en) | Method for controlling a compressed air installation comprising several compressors, control box applied thereby and compressed air installation applying this method | |
| KR101427955B1 (en) | Method for controlling water pump of vehicle and system thereof | |
| US9091259B2 (en) | Method and controller for operating a pump system | |
| US8145926B2 (en) | Fan speed control of silicon based devices in low power mode to reduce platform power | |
| WO2011056319A4 (en) | Fan array control system | |
| KR102156953B1 (en) | Method, device, and system for controlling hydraulic pump of construction machine | |
| US20170037790A1 (en) | Device for controlling engine and hydraulic pump of construction equipment and control method therefor | |
| JP2013136971A (en) | Motor controller and electric pump unit | |
| CN105121858A (en) | Pump device | |
| JP2013519815A (en) | Positive displacement pump operation control device, pump system, and operating method thereof | |
| EP1477679B1 (en) | Method of controlling a plurality of compressors | |
| CN104514705A (en) | Pumping system control | |
| JP6136140B2 (en) | Motor control device and electric pump unit | |
| RU2766499C2 (en) | Method for operation of a circulation pump, as well as circulation pump for implementation of said method | |
| CN102072186B (en) | Volume control method for multistage centrifugal compressor | |
| CN106870226B (en) | Method and system for controlling motor of fuel pump | |
| EP3940237B1 (en) | Multi-pump control system | |
| CN117222816A (en) | Mass flow interpolation system and method for a dynamic compressor | |
| EP2529119A1 (en) | Compressor control method and system | |
| JP2017129108A (en) | Pump operation pattern control method and pump unit | |
| KR101605111B1 (en) | Apparatus and method of driving booster pump for saving power | |
| US8747068B2 (en) | Controlled angular acceleration for air moving devices | |
| RU2773352C1 (en) | System and method for controlling multiple pumps and a computer-readable media with instructions for the implementation of the method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |