EP1759117A1 - Procede et dispositif de surveillance d'un courant fluidique refoule par une pompe - Google Patents

Procede et dispositif de surveillance d'un courant fluidique refoule par une pompe

Info

Publication number
EP1759117A1
EP1759117A1 EP06724227A EP06724227A EP1759117A1 EP 1759117 A1 EP1759117 A1 EP 1759117A1 EP 06724227 A EP06724227 A EP 06724227A EP 06724227 A EP06724227 A EP 06724227A EP 1759117 A1 EP1759117 A1 EP 1759117A1
Authority
EP
European Patent Office
Prior art keywords
pressure
pump
stroke
values
measured
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
Application number
EP06724227A
Other languages
German (de)
English (en)
Other versions
EP1759117B1 (fr
Inventor
Sergei Gerz
Klaus Müller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Grundfos Holdings AS
Original Assignee
Alldos Eichler GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alldos Eichler GmbH filed Critical Alldos Eichler GmbH
Publication of EP1759117A1 publication Critical patent/EP1759117A1/fr
Application granted granted Critical
Publication of EP1759117B1 publication Critical patent/EP1759117B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/0009—Special features
    • F04B43/0054—Special features particularities of the flexible members
    • F04B43/0072—Special features particularities of the flexible members of tubular flexible members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B13/00—Pumps specially modified to deliver fixed or variable measured quantities
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B51/00—Testing machines, pumps, or pumping installations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2201/00—Pump parameters
    • F04B2201/02—Piston parameters
    • F04B2201/0201—Position of the piston
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2205/00—Fluid parameters
    • F04B2205/03—Pressure in the compression chamber

Definitions

  • the invention relates to a method and a device for monitoring a pumped by a pump fluid flow.
  • This pressure is not representative of the pressure in the dosing, in particular due to the inherent stiffness of the membrane, which is particularly the case for double leak detection used for the case and also due to a possibly used return spring, without which in turn a safe suction is often not guaranteed. Criteria for the recognition of error functions should be only the mean suction and delivery pressure and the efficiency of the pump, which can only describe a faulty behavior very globally.
  • the invention is therefore based on the object of specifying a method and a device of the aforementioned type, by means of which in particular a reliable and precise error detection and identification is possible.
  • the stated object is achieved by a method of the type mentioned above, which is characterized in that the pressure of the fluid is measured continuously or quasi-continuously as ACTUAL values at least in partial regions of the stroke of the pump and compared with nominal values.
  • the invention further provides a device of the type mentioned above, which is characterized by at least one pressure sensor for continuous or quasi-continuous measurement of the pressure of the fluid at least in partial areas of the stroke of the pump and by a comparison device for comparison the measured actual values of the pressure with nominal values.
  • the latter can be specified for the respective pump type-specific as empirical values based on the knowledge of parameters of a pump and the use of the same, but also be obtained by a reference measurement from a faultless system.
  • the actual values of the pressure are assigned to positions of the piston or of the diaphragm of the pump and compared with the desired values corresponding to the same positions.
  • the desired values of the pressure are preferably assigned to the piston position in an indicator diagram, which corresponds to error-free operation.
  • an indicator diagram is generally also a pressure curve diagram, it specifically indicates the pressure curve over the piston path - ie for the pressure and suction strokes - as a closed line in the manner of a circular process. It is therefore much more universal than a pressure-time diagram, which in contrast is time- and speed-dependent.
  • the indicator diagram can be specified according to the type either before the installation of the pump with the rest of the software and / or in each case new and the Situation to be generated accordingly. It is essential that the pressure profile over the piston travel is determined and does not respond in any way to the time and that a comparison with ideal target values for a trouble-free system, but not with deficient operating states.
  • the desired values of the pressure at each measured time are determined from the travel diagram of an engine driving the pump.
  • the driving diagram of the motor is the course of the revolution (steps / angles / reference points) of the same over time.
  • this travel diagram is predetermined by the speed control. This is due to a rigid coupling or transmission of the rotational movement of the drive motor to the piston or the diaphragm by means of a gearbox, the position of these parts always known and thus given movement or speed of the piston, the speed may be different or can change. In this case, for example, the rotational speed during the compression stroke may be slower than during the suction stroke.
  • the assignment of time and position is carried out by the engine and control of the same having drive system.
  • the engine is a step-by-step reversible motor such as a stepping motor, electronically commutated motor (EC motor) or the like.
  • the movement of the motor is carried out by - gradual - control of the motor, so that the control of the engine always "knows" how the engine and thus the piston is.
  • a sensor for instantaneous determination of the position of the piston over its entire path is not necessary and not provided.
  • the drive system However, only for synchronization of the engine control have a certain position of the piston having synchronizing.
  • While an extremely preferred embodiment provides that the pressure in a metering chamber of the pump is measured, it can also be provided that the pressure in a supply line or in an outlet line to or from the metering chamber of the pump is measured. As a result, individual characteristic values can be determined. In a preferred embodiment, measurements take place in the dosing space and in an inlet and / or outlet line. As a result, a multiplicity of values can be detected for determining a wide variety of errors, in some cases also redundantly.
  • a control of the pump in terms of a constant or desired flow rate is possible.
  • a preferred embodiment of the invention provides that in the event of a deviation of the actual value from the pressure, the desired value, an error message is issued.
  • the pressure profile is monitored at the end of the suction stroke and / or at the beginning of the pressure stroke, wherein in the case of persistence of the actual value of the pressure in the negative pressure region cavitation is present in both cases and reported, if necessary.
  • Another preferred embodiment of the invention provides that the pressure curve in the area of the dead points of the pump is monitored, wherein in particular arranged at a faster pressure increase at the beginning of the pressure stroke and / or slow pressure reduction at the beginning of the suction stroke of a leakage in a downstream of the dosing Pressure valve is reported.
  • a leak of a suction valve arranged in the inflow of the dosing head is reported.
  • an error message may be output at the SETPOINT value of the pressure during the monitoring process.
  • Such a pressure behavior which indicates an unacceptably high system pressure, can occur, for example, when a pressure-side slide is inadmissibly closed.
  • a leakage in the pressure line indicating leakage message is output at the target value of the pressure below the actual values.
  • the device according to the invention may be further characterized in that a speed-controlled motor is provided for driving the pump, whose angular position in turn can be used to determine the setpoint values for the pressure.
  • the comparison device is in particular designed in a computer, such as a PC, microcontroller or the like. forms and can in particular control a motor control for a motor of the pump.
  • input units for inputting input data, volume flow settings, evaluation strategies, maximum permissible pressure or the like and output units for outputting output data, such as error messages, pressure values, indicator diagram or the like may be provided.
  • the pressure sensor is arranged in the dosing, further embodiments may provide that a pressure sensor in a supply line to the dosing and / or a pressure sensor is arranged in an output line from the dosing.
  • the comparison device compares steadily in critical phases of the pressure and suction stroke the instantaneous pressure curve (actual value) with that of a fault-free pressure curve (nominal value) and detects depending on the size of the deviation, whether the consequent dosage error is still tolerable is or is not and gives, if appropriate, a corresponding signal for the desired consequences.
  • the numerous error causes occurring in practice can be detected and detected, such as cavitation, air bubbles, leaks and faults on the pressure and suction side.
  • dosing errors can be compensated in a simple manner as a result of pressure fluctuations on the pressure side by adjusting the speed.
  • FIG. 1 shows a schematic block diagram of a device according to the invention for monitoring a fluid delivered by a pump with a pressure sensor arranged in the metering chamber;
  • Figures 2a - 2f further arrangements of individual or combined pressure sensors.
  • FIG. 3 shows a diagram for illustrating the correction of the volume flow
  • Fig. 4 is a cavitation in the dosing indicating diagram (solid line) against the normal pressure curve (dashed
  • Fig. 5 shows the pressure profile over the stroke in air or
  • FIG. 7 shows the course of the pressure when leakage occurs in the suction valve and / or to the outside
  • FIG. 8 shows a flow chart for the sequence of the method according to the invention.
  • the illustrated in Fig. 1 preferred embodiment of a device 1 according to the invention for monitoring a funded by a pump fluid has a pump 2 with a metering chamber 3.
  • the pump 2 is formed in the illustrated embodiment as a diaphragm pump and therefore has a membrane 4.
  • the membrane 4 is of a Motor 5 driven and moved via the output shaft.
  • a suction valve 8 is arranged in an outlet 9 from the metering chamber 3, a pressure valve.
  • the motor 5 is associated with a motor controller 11, by means of which on the one hand the motor operation is controlled and on the other hand in a speed-controlled motor, as well as a stepper motor, a motor position to a computer 12 (PC, microcontroller) reports, creating a travel diagram of the piston with is given known piston position or speed at any time, the controller so "white” at any time, where the piston is located.
  • a pressure sensor 13 is arranged, which is designed in particular as a pressure-voltage converter and the output signal via a line 14 is also supplied to the computer 12.
  • the computer 12 is as comparison means for comparing measured by the pressure sensor 13 actual values of the pressure with existing from the engine position of the engine controller 11 in the context of a nominal pressure of a piston position indicator graph (Fig. 4-7) of the pump certain target values of the pressure and to effect action in the event that both do not match. This action may consist, for example, in a speed adaptation via the control line 15 to the engine control 11 so as to - adapt the engine speed.
  • the computer 12 further input units 16 and output units 17 are assigned. About the input units, such as a keyboard, mass storage, etc., input data, such as flow adjustment, • evaluation strategy, maximum allowable pressure or the like can be specified to the computer 12.
  • FIGS. 2a to 2f show further embodiments of the ⁇ An order of pressure sensors for detecting pressure.
  • Pressure sensor 13b arranged in the pressure line 19 and in the embodiments of Fig. 2c to 2f combinations of these pressure sensors 13, 13a, 13b are provided.
  • a pressure sensor 13a on the suction side by means of a pressure sensor 13a on the suction side, the delayed start of a suction phase can be detected simply and precisely, while by means of a pressure sensor 13b on the pressure side, a premature pressure reduction at the end of a pressure stroke as well as a failure to reach the (output) system pressure are recognized simply and precisely can be, in particular in combination with a provided in the metering pressure sensor 13, the error detection can be improved.
  • FIG. 4 to 7 show indicator diagrams (pressure curve diagrams of the pressure over the stroke), wherein the stroke position with pressure 0, the position of maximum size of the dosing is, in which the diaphragm in Fig. 1 so by the engine as far as possible left, while the stroke value 100% denotes the largely right position of the diaphragm and thus the largest possible reduction of the dosing, then the suction stroke begins.
  • Fig. 4 shows, as well as Figs. 5 to 7 in dashed lines the normal pressure curve in the dosing without occurrence of any error, so a conventional indicator diagram. With a continuous line drawn through in FIG.
  • the line of passage is shown with the line drawn through when air or gas occurs (without cavitation). It can be seen that, in contrast to cavitation, the increase in pressure takes place immediately at the beginning of the pressure stroke, but in the initial region of the pressure stroke, it is much flatter than during normal course.
  • the occurrence of air or gas can thus be determined, in particular, by determining the actual gradient of the pressure profile with respect to the desired gradient, as a result of which it is possible to distinguish it from cavitation, since in this case the gradient is essentially the same as in normal Pressure gradient.
  • Fig. 6 also shows in solid line the pressure curve for leaks in the pressure valve, so that the pressure valve does not close completely, so that at the beginning of the intake stroke, the pressure drop is much slower than normal course, as liquid through the pressure valve can flow back.
  • the pressure increase at the beginning of the print stroke is faster or earlier than usual.
  • FIG. 7 shows a continuous line in the diagram for an outflowing leak in the suction valve and / or to the outside. Takes place here through the leak not only a slow increase in pressure, but the pressure may be IMP EXP ⁇ including lower than in normal course. In addition, premature pressure drop occurs at the end of the pressure stroke.
  • step E The sequence of a preferred embodiment of the method according to the invention is shown with the diagram of FIG. 8. If the pressure remains at the end of the suction stroke and at the beginning of the pressure stroke in the vacuum region (steps A, B, FIG. 4), it is checked whether the present cavitation is still within a permissible range and / or the system pressure - in the further pressure stroke. Phase - corresponds to the predetermined pressure (steps C, D). If this is not the case, then an error signal is specified with regard to a false lift indicating a cavitation and / or a system pressure (step E).
  • a pressure valve test is carried out, ie it is checked whether the pressure drop at the beginning of the suction stroke is too slow and the pressure build-up at the beginning of the pressure stroke is too fast. Furthermore, a system pressure test is likewise carried out by checking the pressures during the course of the pressure and optionally the suction stroke (step F, FIG. 6). If errors occur (step G), an error message regarding the faulty pressure valve (step H) also occurs. If no errors occur, then (step I) a check for disruptive gas bubbles in the dosing chamber according to FIG. 5 takes place, ie whether the gradient during pressure build-up (and in the pressure drop) is substantially flatter than that in normal conditions. drove. If this is the case (query J), then a corresponding error message (K).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

L'invention concerne un procédé et un dispositif de surveillance d'un courant fluidique refoulé par une pompe. Ce procédé est caractérisé en ce que l'allure de la pression du fluide est mesurée en tant que valeurs réelles en continu ou en quasi-continu au moins dans des zones partielles de l'élévation de la pompe et comparée aux valeurs théoriques. Ce dispositif est caractérisé par au moins un capteur de pression destiné à la mesure continue ou quasiment continue de la pression du fluide au moins dans des zones partielles de l'élévation de la pompe et par un dispositif de comparaison permettant de comparer les valeurs réelles mesurées de la pression aux valeurs théoriques.
EP06724227.1A 2005-04-14 2006-04-11 Procede et dispositif de surveillance d'un courant fluidique refoule par une pompe Active EP1759117B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005017240A DE102005017240A1 (de) 2005-04-14 2005-04-14 Verfahren und Vorrichtung zur Überwachung eines mittels einer Pumpe geförderten Fluidstromes
PCT/EP2006/003299 WO2006108606A1 (fr) 2005-04-14 2006-04-11 Procede et dispositif de surveillance d'un courant fluidique refoule par une pompe

Publications (2)

Publication Number Publication Date
EP1759117A1 true EP1759117A1 (fr) 2007-03-07
EP1759117B1 EP1759117B1 (fr) 2013-11-06

Family

ID=36685719

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06724227.1A Active EP1759117B1 (fr) 2005-04-14 2006-04-11 Procede et dispositif de surveillance d'un courant fluidique refoule par une pompe

Country Status (4)

Country Link
US (1) US7726179B2 (fr)
EP (1) EP1759117B1 (fr)
DE (1) DE102005017240A1 (fr)
WO (1) WO2006108606A1 (fr)

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Also Published As

Publication number Publication date
US20080190176A1 (en) 2008-08-14
US7726179B2 (en) 2010-06-01
EP1759117B1 (fr) 2013-11-06
DE102005017240A1 (de) 2006-10-19
WO2006108606A1 (fr) 2006-10-19

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