CN101033744A - Method and apparatus for pump protection without the use of traditional sensors - Google Patents
Method and apparatus for pump protection without the use of traditional sensors Download PDFInfo
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- CN101033744A CN101033744A CN200710001543.5A CN200710001543A CN101033744A CN 101033744 A CN101033744 A CN 101033744A CN 200710001543 A CN200710001543 A CN 200710001543A CN 101033744 A CN101033744 A CN 101033744A
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- pump
- speed
- value
- power
- condition
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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
- F04D15/0066—Control, e.g. regulation, of pumps, pumping installations or systems by changing the speed, e.g. of the driving engine
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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
- F04D15/0209—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the working fluid
- F04D15/0218—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the working fluid the condition being a liquid level or a lack of liquid supply
- F04D15/0236—Lack of liquid level being detected by analysing the parameters of the electric drive, e.g. current or power consumption
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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
- F04D15/0088—Testing machines
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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
- F04D15/0209—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the working fluid
Abstract
The present invention provides protection for centrifugal pumps while differentiating between dangerous operating conditions (e.g. dry running, minimum flow and runout) and/or conditions where transient conditions (e.g. closed valve operation) may occur and the protection can be revoked once the condition clears. The methodology utilizes a calculated flow value which can be mathematically determined from a calibrated closed valve power vs speed curve and/or various pump and motor parameters such as speed, torque, power and/or differential pressure or from calibrated flow curves stored in the evaluation device. The calculated flow value is then compared to threshold values of flow associated with these adverse operating conditions.
Description
The cross reference of related application
The title that present patent application requires on March 8th, 2006 to submit to is " Method for PumpProtection Without the Use of Traditional Sensors " temporary patent application no.60/780 (911-2.22-1/05GI002), 529 preference, and the title that relates to submission on March 8th, 2006 is " Method For DeterminingPump Flow Withou tTraditional Sensors " temporary patent application no.60//780,546 (911-2.24-1/05GI003).The full content of these two temporary patent applications is introduced the application by reference.
Technical field
The present invention relates to a kind of have comprise the pumping system of centrifugal pump at interior pump; And relate in particular to a kind of pump guard method and equipment that does not use traditional sensors.
Background technique
Other similar devices and defective thereof are as follows:
U.S. Patent No. 7; 080; 508 disclose a kind of method and apparatus that is used to the pump protection of the torque control of mechanical loss compensation; it, wherein provides the control logic of the operational condition that the direct feedback of utilizing torque (perhaps power) and speed do not expect with identification and provides suitable operation to respond to protect driven equipment (centrifugal pump) not to be damaged by with reference to being introduced at this.Described logic can embed in variable speed drive or the programmable logic controller (PLC) (PLC).Yet this technology may be limited to the pump with the constant ascending power curve of condition of closing from valve.These pumps have 2000 usually and reach following specific speed.This method needs manual input power loss, and power loss can not turn to the factor according to the cutting law, to keep validity in wide speed range of operation.
And, below known equipment all do not comprise be used to distinguish the operational condition do not expected not use traditional sensor and/or additional control to each condition logic of control pump suitably.
U.S. Patent No. 6,591,697 disclose and a kind ofly are used to use motor torque to measure the technology of determining flow rate pump, and wherein motor torque measurements provides a kind of torque and speed described with respect to the method for the relation of flow rate pump and use frequency conversion drive (VFD) to adjust the ability of pump duty with the speed of adjusting centrifugal pump.Yet this equipment does not comprise provides the logic that the operational condition of not expecting is protected.The speed of the calibration of described equipment utilization special use to the curve of torque obtaining flow, thereby reduced flexibility during being provided with at the scene.
Authorize U.S. Patent No. 6 to the assignee of present patent application; 464; 464 B2 disclose the method and apparatus of a kind of control pump system, and this system provides a kind of control and pump protection algorithm, has wherein used VFD to regulate flow, pressure or the speed of centrifugal pump.Yet this equipment need use other instruments, and this has increased the cost and the complexity of drive system, has brought potential potential faults and unnecessary cost.
Another kind of known equipment; be the Load Controls (Sturbridge of company; MA) PMP 25 provides a kind of pump protection, and it carries out relevant with various operational conditions (condition of for example dally, valve cutting out) the power reading that obtains by the observation to current of electric intensity and speed then.(seeing patent no.5,930,092 and 5,754,421).Yet the product of Load Controls only is suitable for constant speed applications and can not provides different control to various conditions, and its protectiveness setting only can be carried out " tripping operation " to motor (tripping) or turn-off.
U.S. Patent No. 6,715,996 B2 disclose a kind of method of operating centrifugal pump, the method of under the condition that valve cuts out pump power being sampled at two speed is provided, and the power of determining parasitic drain and calculating other frequency place adjustment is to determine whether to exist the condition that can cause electrical fault.Yet this technology is only protected the zero delivery condition, does not comprise the logic that detects min flow condition (flow is low excessively) or overload condition (flow is too high), and does not also distinguish no demand conditioned disjunction dry run condition.
PCT WO 2005/064167 A1 discloses a kind of quantitative measurment technology, provides to use the power/differential pressure curve of calibration with respect to the method for flow with respect to speed.The data of calibration are stored and compare to determine pump duty with currency.Yet this technology does not comprise the logic that the operational condition of not expecting is provided protection.It also utilizes power/Δ pressure under the some speed that are stored in the assessment apparatus with respect to the calibration curve of flow.This method needs exclusive data with the acquisition flow, thereby has reduced flexibility during being provided with at the scene.
A kind of product of ABB Industry Oy (Helsinki, Finland) provides frequency conversion drive (VFD), and it has the parameter that allows to dispose minimum and maximum torque value and operates outside these parameter areas to prevent load driver (motor).Yet ABB drives the logic be not provided for explaining different operational conditions, do not allow yet convergent-divergent for example pump centrifugal load or when speed reduces, do not consider mechanical loss in the miniature pump yet.
Frequency changing driving system can be configured to utilize flow or pressure switch to discern the operational condition of not expecting.Yet, use additional process switch to increase the cost and the complexity of drive system, brought potential fault point and unnecessary spending.
In addition, in the patentability retrieval of carrying out related to the present invention, obtained following patent.It is summarized as follows:
The open no.2004/0064292 of the U.S. discloses a kind of required centrifugal pump for deep well of optimum rank that keeps.Wherein use torque and speed data to adjust power with respect to rated velocity, and determine rated flow based on disclosed Pump data with the input power and the use pump cutting law of calculating pump.Wherein use cutting law data and disclosed performance to determine pump head, efficient and minimum required inlet head.Accurate method of calculation does not provide.Wherein only shown flow as the function of power and pressure head, and as the efficient and the inlet head of the function of flow.The simple rated output of described method and it is adjusted at rated velocity, and determine flow from disclosed performance data based on the cutting law.Although be extensive use of in pump industry, it not is accurately always that the cutting of pump performance is proofreaied and correct.
Although the open no.2004/0064292 of the U.S. discloses a kind of control system of centrifugal pump, do not relate to and adjusting or calibration steps.This method need be used actual pump test data, brings the risk of introducing than mistake.The U.S. Patent No. 6,709,241 of authorizing the application's assignee discloses a kind of technology that needs the actual performance data input under four sensors and the some speed in frequency conversion drive.Its use traffic sensor (external flow meter) compares with the threshold value with actual flow and minimum discharge, but can not distinguish condition, dry run condition or overload condition that min flow condition, valve are closed.
The open no.2005/0123408 of the U.S. discloses a kind of self-calibration process, determines that pump pressure increases the minimum speed of an increment.But it is not used to calibrate power.The idle running protection is based on actual current reading and the comparison of current threshold is carried out.Threshold value is based on a service speed.
U.S. Patent No. 4,468,219 and No.4,795,314 and the open no.US2002/0141875 of the U.S. a kind of peristaltic pump or positive-displacement pump are disclosed, its behavior is very different with the centrifugal load about torque and speed.
U.S. Patent No. 6,783,328 and open no.2002/0150476 disclosed Technology Need sensor monitoring flow of the U.S. or pressure, so that set-point value and threshold value are compared.If surpass threshold value, then underspeed so that set point is lower than threshold value.
U.S. Patent No. 4,650,633 disclose a kind of method, its based at the sensor of pump intake place test fluid temperature and pressure and the flow of restrictive pump to prevent cavitation.
Based on understanding and evaluation to above-described known prior art; needing in related domain a kind ofly can not need to use the technology of traditional sensor for centrifugal pump provide protection; thereby can distinguish risky operation condition (for example idle running, minimum discharge and overload) and/or the condition (for example valve close operation) of momentary status may take place, in case and these conditions remove then the cancellation protection.
Summary of the invention
The invention provides a kind of new and unique method and apparatus that is used for not using traditional sensor to carry out the pump protection, its by the calculated flow rate value with the motor signal of threshold value flow, speed and the power (perhaps torque) of the curve of the power of closing with respect to valve and for example the following optimum efficiency power of rated pump speed, power that valve cuts out and the pump performance data that disclose substantially of optimum efficiency flow compare from the speed that is stored in the field calibration in the assessment apparatus.Be used for to obtain by various technology with the flow input of the calculating of threshold value flow value comparison, to use pump cutting law data and to be stored in traffic alignment curve and for example pump and the motor signal of speed and power (perhaps torque) or speed and power/differential pressure under the various speed in the assessment apparatus, calculated flow rate.
The control pump method of operating is characterised in that actual flow value and the corrected threshold flow value of proofreading and correct based on pump speed is compared, thereby determines pump operated condition.Based on described comparison, can adapt to pump operated reaction.
The relation that the correction of threshold value flow value is based between actual pump speed and the rated pump speed is carried out.
The threshold value flow value of proofreading and correct can comprise overload condition value (flow is excessive), minimum stream value (flow is too small) or their some combination, and described method can comprise that the overload condition threshold value of will proofread and correct compares with actual overload flow value, thereby determines the overload condition of pump.
Described method can also comprise that minimum discharge threshold value and the actual minimum stream value that will proofread and correct compare, thereby determine or the normal flow rate condition of pump or may be min flow condition, these steps compare minimum discharge threshold value and the actual flow value of proofreading and correct individually or jointly, and the performance number that the valve under actual power value and the current pump speed cuts out compares, thereby determines whether to exist the min flow condition or the dry run condition of pump.Embodiment can also comprise that the proportion to the medium that is sucked has carried out the actual power value of proofreading and correct, performance number or its combination that valve cuts out.
In fact, the threshold value of the flow value of the calculating flow that can be associated with these disadvantageous operational conditions compares.The curve of the power that the current operating value of speed, power or torque can be closed with respect to valve with the speed that is stored in the field calibration in the assessment apparatus and for example the optimum efficiency power under the rated pump speed, power that valve cuts out and the basic openly pump performance data of optimum efficiency flow compare, thereby calculating actual flow, perhaps can compare with respect to power (perhaps torque) or flow calibration curve, thereby determine the actual flow value with the flow that is stored in the assessment apparatus with respect to power/differential pressure.Comprised in installation under the situation of flowmeter, can be used as direct input to pump protection algorithm.Logic can be embedded into frequency conversion drive or programmable logic controller (PLC).
The present invention can also comprise the controller of the module with the set that is configured to realize above-mentioned feature, and the pumping system with described controller.
Among the disclosed embodiment, protection is based on the torque of self-driven measurement and speed to compare with rated output and with the power of calculating and based on the maximum power threshold of cutting law to velocity correction in US2004/0064292.The method according to this invention uses the power of closing by the valve of proofreading and correct to create than the curve of the power that may only use the velocity correction more accurately of cutting law with respect to flow with respect to the flow value of the no sensor of the curve derivation of speed.Flow value and minimum discharge with described no sensor compares with the threshold value of crossing current carrying capacity then.And by the valve power of closing of calibration is checked idle running with the comparison of the actual power under current service speed and the specific gravity.
In fact, the invention provides protection to centrifugal pump, distinguish risky operation condition (for example idle running, minimum discharge and overload) simultaneously and/or may take place transient state condition (for example valve close operation) in case and these conditions remove then the cancellation protection.Described method utilization can be related with these unfavorable operational conditions the flow value of the calculating that compares of the threshold value of flow.The curve of the power that the current operating value of speed, power or torque can be closed with respect to valve with the speed that is stored in the field calibration in the assessment apparatus and for example the optimum efficiency power under the rated pump speed, power that valve cuts out and the basic openly pump performance data of optimum efficiency flow compare, thereby calculated flow rate, perhaps can be stored in the assessment apparatus, compare with respect to power (perhaps torque) or flow calibration curve with the flow of various speed with respect to power/differential pressure.The threshold value of then that the flow value that calculates is related with these unfavorable operational conditions flow compares.
At last, it should be noted that, pump power under the condition that calibrating valve of the present invention is closed is adjusted disclosed performance with the reflection actual performance with respect to speed and based on calibration curve, thereby determines more exactly that than aforementioned announcement 2004/0064292 is disclosed power under the service speed is with respect to flow.
Description of drawings
Fig. 1 is the skeleton diagram according to basic pumping system of the present invention;
Fig. 2 is the flow chart according to the basic step of carrying out by controller shown in Figure 1 of the present invention; And
Fig. 3 is the skeleton diagram of the controller shown in Figure 1 of execution basic step shown in Figure 2.
Embodiment
Fig. 1 shows according to basic pumping system of the present invention, usually is expressed as 2, and it has controller 4, motor 6 and pump 8.In operation, according to controller 4 of the present invention, the motor signal of curve, speed and the power (perhaps torque) of the power that the speed by being stored in the field calibration in the assessment apparatus is closed with respect to valve and the optimum efficiency power under for example described rated pump speed, power that valve cuts out and the basic openly pump performance data of optimum efficiency flow, and determine the flow value that calculates.Described being used for can also obtain by various technology with the flow input of the calculating of threshold value flow value comparison, to use pump cutting law data and to be stored in traffic alignment curve and for example pump and the motor signal of speed and power (perhaps torque) or speed and power/differential pressure under the various speed in assessment apparatus or the module (for example module 4a among Fig. 3), calculated flow rate.Comprise in installation under the situation of flowmeter that it can be as the direct input of pump protection algorithm.
Especially, controller 4 is by the operation of module 4a (see figure 3) control pump 8, and module 4a is configured to actual flow value and threshold value flow value based on the velocity correction of pump 8 are compared, thereby determines pump operated condition.Based on described comparison, can adapt to the operation of pump 8, before this is included in and only gives a warning, in response to described condition, use the user that delay can be set, warning and speed is reduced to safety operation speed reports an error and closes power machine or the mistake and restart pump and whether motor is removed with the inspection condition of automatically reseting.If condition is removed, then cancel this adaptation and pump enabling.Described correction is based on and meets actual pump speed as described below and the relation between the rated pump speed is carried out.
The threshold value flow value of proofreading and correct can comprise overload condition value, minimum stream value or their some combination, and the overload condition threshold value that module 4a can be configured to proofread and correct compares with actual overload flow value, thereby determines the overload condition of pump 8.
Minimum discharge threshold value and actual minimum stream value that module 4a can also be configured to proofread and correct compare, thereby determine or the normal flow rate condition of pump or may be min flow condition, these steps compare minimum discharge threshold value and the actual flow value of proofreading and correct individually or jointly, and the performance number that the valve under actual power value and the current pump speed cuts out compares, thereby determines whether to exist the min flow condition or the dry run condition of pump.Embodiment can also comprise that the proportion to the medium that is sucked has carried out the actual power value of proofreading and correct, performance number or its combination that valve cuts out.
In fact, the threshold value of the flow value of the calculating flow that can be associated with these disadvantageous operational conditions compares.The curve of the power that the current operating value of speed, power or torque can be closed with respect to valve with the speed that is stored in the field calibration in the assessment apparatus and for example the optimum efficiency power under the rated pump speed, power that valve cuts out and the basic openly pump performance data of optimum efficiency flow compare, thereby calculated flow rate, perhaps can be stored among assessment apparatus or the module 4a, compare with respect to power (perhaps torque) or flow calibration curve at the flow at various speed place with respect to power/differential pressure, thereby determine the actual flow value.Comprised in installation under the situation of flowmeter (not shown), can be used as the direct input of the pump protection algorithm of in controller 4, realizing.Control logic can be embedded in the controller of 4a for example, and as shown in the figure, it can have the form of frequency conversion drive (VFD) or programmable logic controller (PLC) (PLC).
In fact; the present invention includes and may be embodied as control logic; this control logic is used to from the direct feedback of power of motor 6 and pump 8 (perhaps torque) and speed and the calculated flow rate value; thereby the operational condition that identification is not expected, and provide suitable operation response not to be damaged with protection machine driven (centrifugal pump).The threshold value of then that the flow value that calculates is related with these unfavorable operational conditions flow compares.Replacedly, the current operating value of speed, power or torque can compare with respect to the power (perhaps torque) or the curve of power/differential pressure with the flow that is stored in the calibration in the assessment apparatus, thereby determines the actual flow value.Replacedly, comprised in installation under the situation of flowmeter, can be used as direct input to pump protection algorithm.
Fig. 2: control logic
Fig. 2 shows in the mode of example and usually is expressed as 10 flow chart, has the basic step 12-18 of pump protection algorithm or the control logic that can realize by controller 4 according to the present invention.Described pump protection algorithm or control logic can be embedded in frequency conversion drive or programmable logic controller (PLC), shown in reference controller in Fig. 14.The mathematical model accurately of the motor that a lot of current VFD system creations are driven is to provide the accurate control to speed and torque.Given this information, protection logic according to the present invention can followingly realize:
Input can comprise:
-minimum speed
-top speed
-rated velocity
Minimum discharge threshold value under the-rated velocity (flow is low excessively)
Overload flow threshold (flow the is excessive) under-rated velocity
-K
DRThe coefficient that-the power of closing with the valve under the current service speed multiplies each other can be used for determining dry run condition.
-guard delay-before announcing protective condition be the time lag of unit with the second.
Based on current service speed, minimum discharge and the following correction of overload flow threshold:
-Q
MIN_COR＝Q
MIN×(N
ACT/N
RATED)
-Q
RO_COR＝Q
RO×(N
ACT/N
RATED)
Wherein:
Q
MIN_CORMinimum discharge for velocity correction
Q
RO_CORThe current carrying capacity of crossing for velocity correction
N
ACTBe actual velocity
N
RATEDBe rated velocity
In case announced certain condition, then logic depends on to be provided with provides following action:
Overload condition 13
If-actual flow is then announced overload protection condition 13 greater than the overload flow set of velocity correction.
The reaction of-driving is the warning user, and does not take further action.Announcing before the overload condition to be set the guard delay cycle.If overload condition is removed, then the overload warning will be eliminated.
Min flow condition 17
If actual flow is lower than the minimum discharge setting and the P of velocity correction
ACTGreater than K
DR* P
SO_ N then announces minimum discharge protective condition 17,
Wherein:
-K
DRBe the idle running coefficient,
-P
ACTBe the actual power that proportion=1 is proofreaied and correct, and
-P
SO_NBe the power that the valve under the present speed of proportion=1 correction cuts out.P
SOTo be the power of closing by the valve that is stored in the assessment apparatus carry out interpolation with respect to the curve of speed to _ N obtains.Replacedly, P
SO_ N can be by the following calculating of cutting law: P
SO_ N=P
So(rated velocity) * (N actual velocity/N rated velocity)
KSO, wherein KSO is generally equal to 3.0.For the pump of fraction horsepower, can be to K
DRProofread and correct with compensation at the P that uses under the cutting computational methods situation
SOThe inaccuracy of _ N.K then
DRCorr=K
DR* (N actual velocity/N rated velocity)
0.5And the formula among Fig. 2 becomes P
ACT＜K
DRCorr * P
SO_ N.
-the reaction that drives can be set to warn the user and not take further action, warning user and be reduced to safe minimum operation speed (reporting to the police and control) or report an error and turn-off the unit.Announcing before the min flow condition to be set the guard delay cycle.Whether driving can also be set to automatically reset warning and controlled conditions or report an error is removed with check system transient condition.The number of times that resets and reset between time can adjust by the user.In case number of resets uses up, if condition is not removed, then the unit keeps turn-offing, and manually restarts up to the user.
Dry run condition 18
If P
ACTLess than K
DR* P
SO_ N then announces idle running protective condition 18.
-the reaction that drives can be set to warn the user and not take further action, perhaps reports an error and turn-offs the unit.Announcing before the dry run condition to be set the guard delay cycle.Driving can not be set to the condition of reporting an error that automatically resets.In case the unit reports an error, then keep turn-offing, manually restart up to the user.
Should be noted that scope of the present invention comprises all functions by user selection ground forbidding.
Fig. 3: controller 4
Fig. 3 shows the basic module 4a and the 4b of controller 4.The controller and the control module that are used for the many dissimilar and kind of control pump are well known in the art.Based on understanding to these known controllers and control module, those skilled in the art can realize the control module of 4a for example and it is configured to carry out and to describe the consistent function of content at this, comprise thereby actual flow value and the corrected threshold flow value of proofreading and correct based on pump speed are compared definite pump operated condition, and realize other basic steps of the present invention, for example shown in Figure 2 and above-described process in accordance with the present invention.In the mode of example, can use the function of hardware, software, firmware or its combination realization module 4a, although scope of the present invention is not limited to its any specific embodiment.In typical software is realized, described module can be one or more architecture based on microprocessor, has microprocessor, random access storage device (RAM), ROM (read-only memory) (ROM), input-output apparatus and the control that is connected these assemblies, data and address bus.Those skilled in the art can programme to described realization based on microprocessor not to be needed too much to test to carry out function described here.Scope of the present invention is not limited to the specific implementation of any use technology known or that develop in the future.
The capable territory of controling appliance known other controller modules 4b, it is as a part of the present invention, and is not described in detail at this.
The application that other are possible
1. pump load monitoring device: pump load monitoring device depends on accurate modeling to the pump power curve with identification minimum discharge and turn-off criterion.Although most load monitoring devices only monitor the power under the speed, described logic can be supported the device of load monitoring more accurately to the variable velocity operation.
2. pump is protected algorithm: the flow measurement of no sensor can provide the reliable indication of operational condition: overload condition (flow is excessive) is lower than the operation (flow is low excessively) of minimum pump duty or the operation of closing at expulsion valve.
Scope of invention
Should be appreciated that unless stated otherwise, also can use, use or be included in any other embodiment described here in this any feature of describing with reference to specific embodiment, characteristic, alternative embodiment or modification.And accompanying drawing is not to draw in proportion.
Although reference example embodiment describes and illustrated the present invention, can make various aforementioned interpolation and omissions with other to it, and not deviate from the spirit and scope of the present invention.
Claims (77)
1. method of operating that is used to control centrifugal pump, centrifugal blender, centrifugal blower or centrifugal compressor comprises:
Actual flow value and the corrected threshold flow value of proofreading and correct based on described pump speed are compared, thereby determine described pump operated condition.
2. method according to claim 1, wherein said method further comprises the operation that relatively adapts to described pump based on described, before this is included in and only gives a warning, in response to described condition, use the user that delay can be set, warning and speed is reduced to safety operation speed, report an error and turn-off described motor or automatically reset mistake and restart described pump and motor to check whether described condition is removed, if and the removing of described condition, then cancel described adaptation and described pump enabling.
3. method according to claim 1, the relation that wherein said correction is based between actual pump speed and the rated pump speed is carried out.
4. method according to claim 1, the threshold value flow value of wherein said correction comprise overload condition value, minimum stream value or their some combination.
5. method according to claim 1, wherein said method comprise overload condition value and actual overload flow value compared, thereby determine the overload condition of described pump.
6. method according to claim 1, wherein said method comprise that minimum stream value and the actual minimum stream value that will proofread and correct compare, thus the normal flow rate condition of definite or described pump or may be min flow condition.
7. method according to claim 1, wherein said method comprises that further minimum threshold flow value and the actual flow value that will proofread and correct compare, and the performance number of also valve under actual power value and the described current pump speed cutting out compares, thereby determines the min flow condition or the dry run condition of described pump.
8. method according to claim 1, wherein said method comprises that further minimum threshold flow value and the actual flow value that will proofread and correct compare, and the performance number of also valve under actual power value and the described current pump speed cutting out compares, thereby determine the min flow condition or the dry run condition of described pump, the performance number that wherein said valve cuts out is to obtain by the power that is stored in the calibration in the memory device is carried out interpolation with respect to the curve of speed.
9. if method according to claim 1 is P wherein
ACTLess than K
DR* P
SO-N then announces dry run condition.
10. method according to claim 1, wherein for the pump of fraction horsepower, can be to K
DRIf proofread and correct with the compensation velocity correction and be based on that cutting is calculated and at P
SOInaccuracy among the-N.
11. method according to claim 7 is wherein proofreaied and correct performance number or its combination that described actual power value, described valve are closed to the proportion of the medium that is sucked.
12. method according to claim 1, the minimum discharge threshold value of wherein said correction is based on formula Q
MIN_COR=Q
MIN* (N
ACT/ N
RATED).
13. method according to claim 1, the overload flow threshold of wherein said correction is based on formula Q
RO_COR=Q
RO* (N
ACT/ N
RATED).
The motor signal of curve, speed and the power (perhaps torque) of the power that 14. method according to claim 1, the calculating of wherein said actual flow value are the speed by being stored in the calibration in the described assessment apparatus closes with respect to valve and the optimum efficiency power under for example described rated pump speed, power that valve cuts out and the basic openly pump performance data of optimum efficiency flow.
15. method according to claim 1, the calculating of wherein said actual flow value are based on the traffic alignment curve under the various speed that are used for using pump cutting law data and are stored in assessment apparatus and for example the pump and the motor signal of speed and power (perhaps torque) or speed and power/differential pressure come one of many technology of calculated flow rate.
16. method according to claim 1, wherein said actual flow value is based on the reading from flowmeter.
17. a controller that is used to control the operation of centrifugal pump, centrifugal blender, centrifugal blower or centrifugal compressor comprises:
Be configured to actual flow value and the corrected threshold flow value of proofreading and correct based on described pump speed are compared, thus the module of definite described pump operated condition.
18. controller according to claim 17, wherein said block configuration is based on the described operation that relatively adapts to described pump, before this is included in and only gives a warning, in response to described condition, use the user that delay can be set, warning and speed is reduced to safety operation speed, report an error and turn-off described motor or automatically reset mistake and restart described pump and motor to check whether described condition is removed, and under the situation that described condition is removed, cancel described adaptation and described pump enabling.
19. controller according to claim 17, the relation that wherein said correction is based between actual pump speed and the rated pump speed is carried out.
20. controller according to claim 17, the threshold value flow value of wherein said correction comprise overload condition value, minimum stream value or their some combination.
21. controller according to claim 17, wherein said block configuration are that overload condition value and actual overload flow value are compared, thereby determine the overload condition of described pump.
22. controller according to claim 17, wherein said block configuration compares for minimum discharge threshold value and the actual minimum stream value that will proofread and correct, thereby determines or the normal flow rate condition of described pump or possible min flow condition.
23. controller according to claim 17, wherein said block configuration compares for minimum threshold flow value and the actual flow value that will proofread and correct, and the performance number of also valve under actual power value and the described current pump speed cutting out compares, thereby determines the min flow condition or the dry run condition of described pump.
24. controller according to claim 17, minimum threshold flow value and actual flow value that wherein said module also is configured to proofread and correct compare, and the performance number of also valve under actual power value and the described current pump speed cutting out compares, thereby determine the min flow condition or the dry run condition of described pump, the performance number that wherein said valve cuts out is to obtain by the power that is stored in the calibration in the memory device is carried out interpolation with respect to the curve of speed.
25. controller according to claim 17, if P wherein
ACTLess than K
DR* P
SO-N then announces dry run condition.
26. controller according to claim 17, wherein for the pump of fraction horsepower, can be to K
DRIf proofread and correct with the compensation velocity correction and be based on that cutting is calculated and at P
SOInaccuracy among the-N.
27. controller according to claim 23 is wherein proofreaied and correct performance number or its combination that described actual power value, described valve are closed to the proportion of the medium that is sucked.
28. controller according to claim 23, the minimum discharge threshold value of wherein said correction is based on formula Q
MIN_COR=Q
MIN* (N
ACT/ N
RATED).
29. controller according to claim 17, the overload flow threshold of wherein said correction is based on formula Q
RO_COR=Q
RO* (N
ACT/ N
RATED).
30. controller according to claim 17, the calculating of wherein said actual flow value are based on the motor signal of curve, speed and power (perhaps torque) of the power that the speed that is stored in the calibration in the described assessment apparatus closes with respect to valve and the optimum efficiency power under for example described rated pump speed, power that valve cuts out and the basic openly pump performance data of optimum efficiency flow.
31. controller according to claim 17, the calculating of wherein said actual flow value are based on the traffic alignment curve under the various speed that are used for using pump cutting law data and are stored in assessment apparatus and for example the pump and the motor signal of speed and power (perhaps torque) or speed and power/differential pressure come one of many technology of calculated flow rate.
32. controller according to claim 17, wherein said actual flow value is based on the reading from flowmeter.
33. controller according to claim 17, wherein said controller are frequency-variable controller or are programmable logic controller (PLC).
A 34. centrifugal pump system or have for example system of other centrifugation apparatus of centrifugal blender, centrifugal blower or centrifugal compressor, has controller, be used to control the operation of centrifugal pump, centrifugal blender, centrifugal blower or centrifugal compressor, described controller comprises:
Be configured to actual flow value and the corrected threshold flow value of proofreading and correct based on described pump speed are compared, thus the module of definite described pump operated condition.
35. pumping system according to claim 34, wherein said block configuration is based on the described operation that relatively adapts to described pump, before this is included in and only gives a warning, in response to described condition, use the user that delay can be set, warning and speed is reduced to safety operation speed, report an error and turn-off described motor or automatically reset mistake and restart described pump and motor to check whether described condition is removed, if and the removing of described condition, then cancel described adaptation and described pump enabling.
36. pumping system according to claim 34, the relation that wherein said correction is based between actual pump speed and the rated pump speed is carried out.
37. pumping system according to claim 34, the threshold value flow value of wherein said correction comprise overload condition value, minimum stream value or their some combination.
38. pumping system according to claim 34, wherein said block configuration are that overload condition value and actual overload flow value are compared, thereby determine the overload condition of described pump.
39. pumping system according to claim 34, wherein said block configuration compares for minimum discharge threshold value and the actual minimum stream value that will proofread and correct, thereby determines or the normal flow rate condition of described pump or possible min flow condition.
40. pumping system according to claim 34, wherein said block configuration compares for minimum threshold flow value and the actual flow value that will proofread and correct, and the performance number of also valve under actual power value and the described current pump speed cutting out compares, thereby determines the min flow condition or the dry run condition of described pump.
41. pumping system according to claim 34, wherein said method comprises that also minimum threshold flow value and the actual flow value that will proofread and correct compare, and the performance number of also valve under actual power value and the described current pump speed cutting out compares, thereby determine the min flow condition or the dry run condition of described pump, the performance number that wherein said valve cuts out is to obtain by the power that is stored in the calibration in the memory device is carried out interpolation with respect to the curve of speed.
42. pumping system according to claim 34, if P wherein
ACTLess than K
DR* P
SO-N then announces dry run condition.
43. pumping system according to claim 34, wherein for the pump of fraction horsepower, can be to K
DRIf proofread and correct with the compensation velocity correction and be based on that cutting is calculated and at P
SOInaccuracy among the-N.
44. pumping system according to claim 34 is wherein proofreaied and correct performance number or its combination that described actual power value, described valve are closed to the proportion of the medium that is sucked.
45. pumping system according to claim 34, the minimum discharge threshold value of wherein said correction is based on formula Q
MIN_COR=Q
MIN* (N
ACT/ N
RATED).
46. pumping system according to claim 34, the overload flow threshold of wherein said correction is based on formula Q
RO_COR=Q
RO* (N
ACT/ N
RATED).
47. pumping system according to claim 34, the calculating of wherein said actual flow value are based on the motor signal of curve, speed and power (perhaps torque) of the power that the speed that is stored in the calibration in the described assessment apparatus closes with respect to valve and the optimum efficiency power under for example described rated pump speed, power that valve cuts out and the basic openly pump performance data of optimum efficiency flow.
48. pumping system according to claim 34, the calculating of wherein said actual flow value are based on the traffic alignment curve under the various speed that are used for using pump cutting law data and are stored in assessment apparatus and for example the pump and the motor signal of speed and power (perhaps torque) or speed and power/differential pressure come one of many technology of calculated flow rate.
49. pumping system according to claim 34, wherein said actual flow value is based on the reading from flowmeter.
50. pumping system according to claim 34, wherein said controller are frequency-variable controller or are programmable logic controller (PLC).
51. method according to claim 4, wherein said method comprise overload condition value and actual overload flow value are compared, thus the overload condition of definite described pump.
52. method according to claim 8, if P wherein
ACTLess than K
DR* P
SO-N then announces dry run condition.
53. method according to claim 8, wherein for the pump of fraction horsepower, can be to K
DRIf proofread and correct with the compensation velocity correction and be based on that cutting is calculated and at P
SOInaccuracy among the-N.
54. method according to claim 7, the minimum discharge threshold value of wherein said correction is based on formula Q
MIN_COR=Q
MIN* (N
ACT/ N
RATED).
55. method according to claim 5, the overload flow threshold of wherein said correction is based on formula Q
RO_COR=Q
RO* (N
ACT/ N
RATED).
The motor signal of curve, speed and the power (perhaps torque) of the power that 56. method according to claim 7, the calculating of wherein said actual flow value are the speed by being stored in the calibration in the described assessment apparatus closes with respect to valve and the optimum efficiency power under for example described rated pump speed, power that valve cuts out and the basic openly pump performance data of optimum efficiency flow.
57. method according to claim 7, the calculating of wherein said actual flow value are based on the traffic alignment curve under the various speed that are used for using pump cutting law data and are stored in assessment apparatus and for example the pump and the motor signal of speed and power (perhaps torque) or speed and power/differential pressure come one of many technology of calculated flow rate.
58. method according to claim 5, wherein said actual flow value is based on the reading from flowmeter.
59. method according to claim 7, wherein said actual flow value is based on the reading from flowmeter.
60. controller according to claim 20, wherein said block configuration are that overload condition value and actual overload flow value are compared, thereby determine the overload condition of described pump.
61. controller according to claim 24, if P wherein
ACTLess than K
DR* P
SO-N then announces dry run condition.
62. controller according to claim 24, wherein for the pump of fraction horsepower, can be to K
DRIf proofread and correct with the compensation velocity correction and be based on that cutting is calculated and at P
SOInaccuracy among the-N.
63. controller according to claim 24, the minimum discharge threshold value of wherein said correction is based on formula Q
MIN_COR=Q
MIN* (N
ACT/ N
RATED).
64. controller according to claim 21, the overload flow threshold of wherein said correction is based on formula Q
RO_COR=Q
RO* (N
ACT/ N
RATED).
65. controller according to claim 23, the calculating of wherein said actual flow value are based on the motor signal of curve, speed and power (perhaps torque) of the power that the speed that is stored in the calibration in the described assessment apparatus closes with respect to valve and the optimum efficiency power under for example described rated pump speed, power that valve cuts out and the basic openly pump performance data of optimum efficiency flow.
66. controller according to claim 23, the calculating of wherein said actual flow value are based on the traffic alignment curve under the various speed that are used for using pump cutting law data and are stored in assessment apparatus and for example the pump and the motor signal of speed and power (perhaps torque) or speed and power/differential pressure come one of many technology of calculated flow rate.
67. controller according to claim 21, wherein said actual flow value is based on the reading from flowmeter.
68. controller according to claim 23, wherein said actual flow value is based on the reading from flowmeter.
69. according to the described pumping system of claim 37, wherein said block configuration is that overload condition value and actual overload flow value are compared, thereby determines the overload condition of described pump.
70. according to the described pumping system of claim 41, if P wherein
ACTLess than K
DR* P
SO-N then announces dry run condition.
71. according to the described pumping system of claim 41, wherein for the pump of fraction horsepower, can be to K
DRIf proofread and correct with the compensation velocity correction and be based on that cutting is calculated and at P
SOInaccuracy among the-N.
72., wherein the proportion of the medium that is sucked is proofreaied and correct performance number or its combination that described actual power value, valve are closed according to the described pumping system of claim 40.
73. according to the described pumping system of claim 40, the minimum discharge threshold value of wherein said correction is based on formula Q
MIN_COR=Q
MIN* (N
ACT/ N
RATED).
74. according to the described pumping system of claim 38, the overload flow threshold of wherein said correction is based on formula Q
RO_COR=Q
RO* (N
ACT/ N
RATED).
75. according to the described pumping system of claim 40, the calculating of wherein said actual flow value is based on the motor signal of curve, speed and power (perhaps torque) of the power that the speed that is stored in the calibration in the described assessment apparatus closes with respect to valve and the optimum efficiency power under for example described rated pump speed, power that valve cuts out and the basic openly pump performance data of optimum efficiency flow.
76. according to the described pumping system of claim 40, the calculating of wherein said actual flow value is based on the traffic alignment curve under the various speed that are used for using pump cutting law data and are stored in assessment apparatus and for example the pump and the motor signal of speed and power (perhaps torque) or speed and power/differential pressure come one of many technology of calculated flow rate.
77. according to the described pumping system of claim 40, wherein said actual flow value is based on the reading from flowmeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310071360.6A CN103206388B (en) | 2006-03-08 | 2007-01-05 | Do not use pump guard method and the equipment of traditional sensors |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US78054606P | 2006-03-08 | 2006-03-08 | |
| US78052906P | 2006-03-08 | 2006-03-08 | |
| US60/780,546 | 2006-03-08 | ||
| US60/780,529 | 2006-03-08 |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310071360.6A Division CN103206388B (en) | 2006-03-08 | 2007-01-05 | Do not use pump guard method and the equipment of traditional sensors |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101033744A true CN101033744A (en) | 2007-09-12 |
| CN101033744B CN101033744B (en) | 2013-07-24 |
Family
ID=37929985
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710001543.5A Active CN101033744B (en) | 2006-03-08 | 2007-01-05 | Method and apparatus for pump protection without the use of traditional sensors |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN101033744B (en) |
| DE (1) | DE102007009301B4 (en) |
| FI (1) | FI20070180A (en) |
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| CN102734182A (en) * | 2011-03-29 | 2012-10-17 | Abb公司 | Method for improving sensorless flow rate estimation accuracy of pump driven with frequency converter |
| CN102734195A (en) * | 2011-03-31 | 2012-10-17 | Abb公司 | Stall detection in fans utilizing frequency converter |
| CN104620056A (en) * | 2012-09-12 | 2015-05-13 | 格兰富控股联合股份公司 | Method for controlling a circulation pump in an installation comprising at least two circulation circuits |
| CN108759991A (en) * | 2018-06-21 | 2018-11-06 | 广东美的暖通设备有限公司 | The diagnosis of survey error method, apparatus and air-conditioning system of sensor in air-conditioning system |
| CN109253092A (en) * | 2017-07-14 | 2019-01-22 | 格兰富控股联合股份公司 | Multi-pump control system |
| CN111237209A (en) * | 2020-02-17 | 2020-06-05 | 苏州欣皓信息技术有限公司 | Water pump rotating wheel stability monitoring method and device, electronic equipment and storage medium |
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| DE102007010768B4 (en) * | 2006-03-08 | 2012-03-29 | Itt Manufacturing Enterprises, Inc. | Method for optimizing valve position and pump speed in a valve system with PID control without the use of external signals |
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- 2007-03-02 FI FI20070180A patent/FI20070180A/en not_active Application Discontinuation
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Also Published As
| Publication number | Publication date |
|---|---|
| DE102007009301A1 (en) | 2007-09-13 |
| DE102007009301B4 (en) | 2012-03-29 |
| FI20070180A (en) | 2007-09-09 |
| FI20070180A0 (en) | 2007-03-02 |
| CN101033744B (en) | 2013-07-24 |
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