EP0528726A1 - Verfahren und Vorrichtung zur Steuerung einer Pumpen-Anlage und Nachweiselement für eine derartige Anlage - Google Patents

Verfahren und Vorrichtung zur Steuerung einer Pumpen-Anlage und Nachweiselement für eine derartige Anlage Download PDF

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Publication number
EP0528726A1
EP0528726A1 EP92402286A EP92402286A EP0528726A1 EP 0528726 A1 EP0528726 A1 EP 0528726A1 EP 92402286 A EP92402286 A EP 92402286A EP 92402286 A EP92402286 A EP 92402286A EP 0528726 A1 EP0528726 A1 EP 0528726A1
Authority
EP
European Patent Office
Prior art keywords
pump
discharge
sensor
pressure
level
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
EP92402286A
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English (en)
French (fr)
Other versions
EP0528726B1 (de
Inventor
Michel Kernours
Roger Amand
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.)
Wilo Salmson France SAS
Original Assignee
Pompes Salmson SAS
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 Pompes Salmson SAS filed Critical Pompes Salmson SAS
Publication of EP0528726A1 publication Critical patent/EP0528726A1/de
Application granted granted Critical
Publication of EP0528726B1 publication Critical patent/EP0528726B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/06—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations specially adapted for stopping, starting, idling or no-load operation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/10—Other safety measures
    • F04B49/106—Responsive to pumped volume
    • 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
    • F04D15/0227—Lack of liquid level being detected using a flow transducer

Definitions

  • the present invention relates to a method for controlling a pumping installation comprising at least one pump driven by a motor, for example an electric motor, a sensor of the pump discharge pressure or of the level of a filled capacity. or emptied by the pump, in which the pump motor is started if the discharge pressure sensor indicates a pressure below a minimum threshold value or the level sensor, a respectively lower level (when filling) or higher (in drain) at a threshold level and the pump motor is stopped when the pressure or level sensor is energized, a minimum flow detector system being arranged in the pump discharge line and said pump being stopped , in the safety or alert position, when after a start delay delay, said minimum flow detector system is not energized.
  • a motor for example an electric motor
  • a sensor of the pump discharge pressure or of the level of a filled capacity emptied by the pump, in which the pump motor is started if the discharge pressure sensor indicates a pressure below a minimum threshold value or the level sensor, a respectively lower level (when filling) or higher (in drain) at
  • a control device of a pumping installation comprising at least one pump driven by a motor, for example an electric motor, a sensor of the pump discharge pressure or of the level of a filled or emptied capacity. by the pump, said pressure or level sensor being connected to a control member of the pump motor, as well as a minimum pump discharge flow sensor connected to the control member of the pump motor to trigger the said stop engine after starting for a time delay if said flow sensor does not indicate the establishment of said minimum flow.
  • the invention also applies to modular detection elements for such pumping installations.
  • the pump discharge valves when they are dirty or corroded after a long running time of the pump, tend to have a very high hysteresis and to remain in the open position as long as a flow opposite to the backflow does not manifest itself, which leads to keeping the discharge pumps in the running position after the emptying of the tank (s) they control and therefore to the rapid degradation of the pumps thus regulated.
  • the method of controlling a pumping installation is characterized in that, in the minimum discharge flow detector system, a heating element applied to the external wall of the supply line is used.
  • a heating element applied to the external wall of the supply line is used.
  • pump discharge a first temperature sensor of the temperature of the external wall of the discharge pipe, placed at a sufficient distance from the heating element so as practically not to be subjected to the thermal influence of this heating element and a second temperature sensor of the external wall of the discharge line, placed near the heating element to be heated by the latter in the absence of a significant flow of liquid in the discharge line, as well as a circuit electric and / or electronic comparison of the heating of the first sensor compared to the second, to indicate the absence of a sufficient delivery flow in case significant heating of the second sensor relative to the first.
  • the first temperature sensor is placed close to and upstream of the heating element with respect to the normal delivery direction of the pump, so as to detect a low flow pump discharge.
  • the pump control device applicable to the regulation of an evacuation pump without an inlet valve, capable of emptying a collection basin is characterized in that it comprises a sensor for pressure mounted on the pump discharge line and connected to a control member of the pump motor capable, on the one hand, of triggering the starting of the pump as soon as the pressure sensed in the discharge line exceeds a first threshold value corresponding to a predetermined level in the collection basin and indicative of the filling state of the collection basin and, on the other hand, to trigger the stopping of the pump when the pressure sensed in the discharge line is less than a second threshold value indicative of the state of emptying of the collection basin and in that said pressure sensor is connected to the control member of the pump through a circuit of safety causing the pump motor to stop in the safety or alert position when, after a time delay when the pump motor starts, the pressure sensed in the discharge line is less than a third threshold value, itself greater than said first threshold value and corresponding to the normal discharge operation of the pump.
  • the pipe section may have two sealed insertion ends, for example flanges, on the discharge pipe and, between these two ends, at least one section of pipe of reduced thickness capable of being subjected to tensile stresses. or significant compression under the effect of the discharge pressure and on the external surface of which the ceramic membrane is bonded or otherwise adhered to which are fixed at least two temperature sensors and, if necessary, at least one pressure sensor with electric strain gauge.
  • the wall of the pipe section is traversed by a passage which is closed transversely by the support of generally planar shape and which is applied in a sealed manner by its periphery to an annular shoulder of support provided in said passage, in order to delimit on the support a central zone which comes, on the internal side, into direct contact with the pumped liquid and which carries, on the external side, said sensors or resistance strain gauge integrated into said support which is made of a material good conductor of heat under a thickness capable of withstanding, in the central zone, the discharge pressure of the liquid which nevertheless produces, on said central zone of the support, significant tensile and / or compression stresses.
  • the electromechanical pump control device which has just been described works correctly in new condition, but it has been found to be very sensitive to fouling and corrosion.
  • the paddle flow sensor 12 which does not cause any significant pressure drop during the pump's operation, was replaced by a static flow sensor, operating for example according to the principle of gauges. electrical and / or electronic measurement constraint.
  • a simpler and more reliable flow sensor operating by heat dissipation.
  • Such a sensor represented schematically in Figures 3 and 4 shows no entry into the fluid circuit that is likely to induce leakage or corrosion.
  • the modular detection element 50 shown in FIG. 6 is produced from a ceramic support 51, for example a relatively flexible membrane due to its small thickness and on which are deposited by any suitable means, in particular by screen printing followed of a cooking, electrical resistances highly variable with temperature, with a positive or negative temperature coefficient as the case may be, and which are intended to serve as electrical and / or electronic temperature measurement devices.
  • the membrane 51 is housed in an interface box 49 made of an electrically insulating material and is held in position before the assembly of the modular element by a box cover not shown in FIG. 6.
  • the connections with the electrical control member 10 are preferably carried out by means of electronic interface detectors, respectively: 10a for detecting the existence of a minimum flow rate in the discharge line 57, 10b for detecting the temperature of the liquid conveyed in the discharge line and 10c for detecting the discharge pressure, that is to say the absolute pressure prevailing in the discharge line 57.
  • the modular detection element 50 contained in the housing interface 49 is protected on the side of the ceramic membrane 51 by a protective cover, not shown in FIG. 6, which is removed for fixing the membrane to the exterior surface of the discharge pipe 57.
  • the interface box 49 is also fixed on the external surface of the pipe 57, for example by a lateral bonding line 66. It can be seen in FIG. 6 that the connection between a detection resistor 51 to 56 and the corresponding terminal fixed to the insulating plate 48 is made by a flexible wire (see flexible wire 67 for terminal 60, inside the interface box 49).
  • the latter is fixed by its ceramic membrane 51 and, if necessary, by its interface box 49 to a pipe section 70 capable of being inserted from sealingly between two parts 68 and 69 of the discharge line of a pump (not shown) in order to ensure the continuity of the discharge line.
  • the pipe section 70 equipped with its modular detection element 50 removably fixed or permanently fixed to the central pipe part of reduced thickness, thus constitutes a complete removable detector block which can be inserted on a discharge pipe. not suitable for measuring minimum flow and, where appropriate, temperature and pressure, for example because it is too thick or is made of a thermal insulating material (reinforced concrete, insulated metal, synthetic material, etc.).
  • the insertable pipe section 70 shown in FIG. 6 comprises, at each of its ends, mounting flanges 71 and 72 provided with sealing means such as an O-ring 73, 74 and intended to cooperate by means of assembly screws 68a, 69a with corresponding flanges formed at each of the ends of the delivery pipe parts 68, 69.
  • the metal discharge pipe part 57 is formed, for example in a metal that is a good heat conductor such as an aluminum alloy, which quickly takes the temperature of the liquid in transit in the discharge line.
  • the pipe part 57 has a reduced thickness, nevertheless ensuring sufficient resistance to the discharge pressure but which causes significant stresses and therefore electrical deformations to appear on the external surface of the pipe under the effect of the discharge pressure.
  • the reduced thickness also allows rapid transmission of the temperature of the liquid discharged by the pump to the external surface of the pipe 57 on which the resistors 52 to 55 are bonded, by means of the thin ceramic support membrane 51 sensitive to temperature and / or to deformations caused by surface stresses.
  • the differential temperature measurement resistors 52 (heated resistance) and 55 to which the respective indices T1 and T2 are assigned are supplied by a source of direct current 65 also used for heating, by means of corresponding adjustment resistors RT1 and RT2.
  • a sensor of the differential voltage VS2 between terminals 64 and 60 makes it possible to address to the external minimum flow detector 10a a voltage which is, in principle, directly proportional to the temperature difference T1-T2 between temperatures T1 and T2 and which allows, by threshold adjustment, to detect the minimum admissible delivery flow for the pump after start-up.
  • the thermal power of the heating resistor 58 is almost completely dissipated in the discharged liquid and the output signal at the terminals 60, 64 is very weak.
  • the output signal on the terminals 61 makes it possible to know at any time the temperature on the external surface of the pipe 57 and to act if necessary when this temperature is too high, which indicates an exaggerated temperature of the fluid discharged by the pump.
  • the second embodiment of the electrical circuits of the modular element 50 differs from that of FIG. 7 essentially in that it comprises, for the measurement of the minimum flow, a double bridge of resistors which allows to measure with greater sensitivity differential variations in sensor temperature caused by the discharge flow rate in line 57.
  • two temperature measurement resistors 52 and 75 (denoted T1, T4) are heated simultaneously by a common heating resistor 58 ′ and are supplied by a continuous current source +/- (terminals 65) in series each with a respective unheated temperature measurement resistor 76 and 55.
  • the differential voltage sensed is thus a function of temperature differences T1.T2-T3.T4 and allows better identification of the relative overheating of the heated resistors 52 and 75.
  • the modular detection element 50 is tightly integrated into a section of pipe 70 which, like the section 70 of Figure 6, is inserted in a sealed manner between two parts 68, 69 of the discharge line of a pump (not shown).
  • the section 70 can, for example, be made of molded plastic (machined for small series) of great thickness to receive the sensor support according to the invention.
  • a passage 77 is formed perpendicular to the wall of the pipe section by forming an annular shoulder 78 on which the edge (coated with an elastomeric seal 79) is applied to a support 80 of generally planar shape (and here circular) for the sensors: temperature 55, differential temperature 52 for measuring the minimum flow rate and stress (strain gauge not shown) with electrical resistances.
  • the support 80 preferably consists of a relatively thin ceramic disc (thickness of the order of 1 mm) which conducts heat well and which has a diameter preferably between 15 and 30 mm.
  • the active resistance 56a (subjected to tensile or compressive stresses) of the strain gauge 56 is generally placed in the center of the exposed area where the maximum flexural stresses exist on the ceramic support 80 of approximately 1 mm d thickness, pinched over its entire periphery by the rigid ring 81 screwed for example into a threaded bore of the passage 77.
  • the connecting wires of the electrical resistances of the sensors deposited on the support 80 are housed in a sheath 82 at the outlet of the modular detection element 50 and they terminate in a coupler 83 ensuring, in a withdrawable manner, the connection interface with cables 60a, 64a to the minimum flow detector 10a, with the cable 61a to the liquid temperature detector 10b and with the cables 62a for detecting the discharge pressure.
  • the modular detection element 50 is generally produced in the form of a removable block of short length which can be inserted on the discharge line 68, 69 by flanges or else can be screwed onto corresponding end pieces of the discharge pipe, the connection to the electrical control member 10 being effected by the withdrawable coupler 83.
  • the large wall thickness of the section 70 makes it possible to use, for this section, a block of inexpensive molded plastic material which withstands the temperatures of hot water in a central heating circuit without damage.
  • the circuits of FIGS. 7 and 8 are, of course, applicable (in a miniaturized form) on the support 80 with a diameter of 15 to 30 mm shown in FIG. 9.
  • the modular element 50 which forms an interchangeable block up to the withdrawable coupler 83 may include, in certain applications, a support 80 removable to the coupler 83. In the event of failure of the electrical and / or electronic circuits mounted on the support 80, this is then extracted after unscrewing or removing the ring 81 and is replaced by another support 80 cooperating with the peripheral elastomer seal 79. Given the fragility of the measurement resistors 52 to 56 and the difficulties in coupling them to the pump control member 10, most applications however provide for the complete exchange of the modular detection element 50 with its pipe section 70.
  • the control devices of a pumping installation delivering on a network or else controlling the level of a capacity filled or emptied by the pump can use the modular detection element 50 fixed on a discharge pipe and connected to a electrical control 10 or else the modular block consisting of the pipe section 70 permanently carrying the modular block 50 detachably connected to the control member 10, to replace the device 11 shown in FIG. 1.
  • the method and the device for controlling a pumping installation according to the invention, as well as the modular detection element which relates thereto, have been illustrated for a pump driven by a electric motor, which is the most common case, but they can, of course, be applied to pumps driven by other motors, such as heat engines.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Reciprocating Pumps (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
EP92402286A 1991-08-16 1992-08-13 Verfahren und Vorrichtung zur Steuerung einer Pumpen-Anlage und Nachweiselement für eine derartige Anlage Expired - Lifetime EP0528726B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9110379A FR2680393A1 (fr) 1991-08-16 1991-08-16 Procede et dispositif de commande d'une installation de pompage.
FR9110379 1991-08-16

Publications (2)

Publication Number Publication Date
EP0528726A1 true EP0528726A1 (de) 1993-02-24
EP0528726B1 EP0528726B1 (de) 1996-04-10

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EP92402286A Expired - Lifetime EP0528726B1 (de) 1991-08-16 1992-08-13 Verfahren und Vorrichtung zur Steuerung einer Pumpen-Anlage und Nachweiselement für eine derartige Anlage

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EP (1) EP0528726B1 (de)
AT (1) ATE136626T1 (de)
DE (1) DE69209746T2 (de)
FR (1) FR2680393A1 (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1336761A2 (de) * 2002-02-13 2003-08-20 Schneider Electric Industrie Italia S.p.A. Steuereinrichtung für Autoklavpumpe
EP1431584A2 (de) * 2002-12-18 2004-06-23 Bogemar, S.L. Elektrisch angetriebene mehrstufige Pumpe
EP1496340A1 (de) * 2003-07-08 2005-01-12 Pompes Salmson Thermischer Durchflussmesser und Verfahren dazu
EP1775476A1 (de) * 2005-10-13 2007-04-18 Alessio Pescaglini Steuervorrichtung für Motorpumpenaggregat
IT201600082411A1 (it) * 2016-08-04 2018-02-04 Enrico Raddi Inverter per impianti idrici, circuito di controllo di quest'ultimo e metodo associato
IT201600082976A1 (it) * 2016-08-05 2018-02-05 Enrico Raddi Pressoflussostato per impianti di recupero acqua piovana
CN108626104A (zh) * 2018-06-22 2018-10-09 佛山科学技术学院 一种防抽空装置

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015119832A1 (de) * 2015-11-17 2017-05-18 Xylem Ip Management Sàrl Förderpumpe zur Druckerhöhung in einer Leitung und Verfahren zum Betreiben einer Förderpumpe
CN107575416B (zh) * 2017-10-19 2024-03-26 江苏国泉泵业制造有限公司 一种带冲洗控制的排污泵防堵进水管道
DE102018208140B3 (de) 2018-05-24 2019-06-13 Continental Automotive Gmbh Pumpenvorrichtung und Verfahren zum Ermitteln eines Kühlmittelmassenstroms durch eine Pumpenvorrichtung einer Brennkraftmaschine

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR934793A (fr) * 1946-08-07 1948-06-01 Procédé et dispositif pour la commande automatique de motopompes et pour la protection contre la marche à vide des pompes en cas de désamorçage
US3438254A (en) * 1965-10-19 1969-04-15 United Control Corp Fluid flow detector
US4255968A (en) * 1979-06-08 1981-03-17 Intek, Inc. Flow indicator
EP0074574A1 (de) * 1981-09-14 1983-03-23 The Perkin-Elmer Corporation Durchflussdruckwandler
FR2649429A1 (fr) * 1989-07-10 1991-01-11 Louis Marc Dispositif de commande de vidange pour appareils sanitaires
WO1991019170A1 (en) * 1990-06-04 1991-12-12 Mcpherson's Limited Flow sensor and control system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR828814A (fr) * 1937-02-04 1938-05-31 Fond Perfectionnement aux disposement aux dispositifs assurant l'arrêt des pompes centrifrêt du courant d'eau dans leurs canalisations de refoulement ou aspiration

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR934793A (fr) * 1946-08-07 1948-06-01 Procédé et dispositif pour la commande automatique de motopompes et pour la protection contre la marche à vide des pompes en cas de désamorçage
US3438254A (en) * 1965-10-19 1969-04-15 United Control Corp Fluid flow detector
US4255968A (en) * 1979-06-08 1981-03-17 Intek, Inc. Flow indicator
EP0074574A1 (de) * 1981-09-14 1983-03-23 The Perkin-Elmer Corporation Durchflussdruckwandler
FR2649429A1 (fr) * 1989-07-10 1991-01-11 Louis Marc Dispositif de commande de vidange pour appareils sanitaires
WO1991019170A1 (en) * 1990-06-04 1991-12-12 Mcpherson's Limited Flow sensor and control system

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1336761A2 (de) * 2002-02-13 2003-08-20 Schneider Electric Industrie Italia S.p.A. Steuereinrichtung für Autoklavpumpe
EP1336761A3 (de) * 2002-02-13 2009-06-10 Schneider Electric Industrie Italia S.p.A. Steuereinrichtung für Autoklavpumpe
EP1431584A2 (de) * 2002-12-18 2004-06-23 Bogemar, S.L. Elektrisch angetriebene mehrstufige Pumpe
EP1431584A3 (de) * 2002-12-18 2005-07-27 Bogemar, S.L. Elektrisch angetriebene mehrstufige Pumpe
EP1496340A1 (de) * 2003-07-08 2005-01-12 Pompes Salmson Thermischer Durchflussmesser und Verfahren dazu
FR2857448A1 (fr) * 2003-07-08 2005-01-14 Pompes Salmson Sa Detecteur et procede de detection de debit par dissipation thermique
EP1775476A1 (de) * 2005-10-13 2007-04-18 Alessio Pescaglini Steuervorrichtung für Motorpumpenaggregat
IT201600082411A1 (it) * 2016-08-04 2018-02-04 Enrico Raddi Inverter per impianti idrici, circuito di controllo di quest'ultimo e metodo associato
IT201600082976A1 (it) * 2016-08-05 2018-02-05 Enrico Raddi Pressoflussostato per impianti di recupero acqua piovana
CN108626104A (zh) * 2018-06-22 2018-10-09 佛山科学技术学院 一种防抽空装置
CN108626104B (zh) * 2018-06-22 2024-04-30 佛山科学技术学院 一种防抽空装置

Also Published As

Publication number Publication date
DE69209746D1 (de) 1996-05-15
ATE136626T1 (de) 1996-04-15
EP0528726B1 (de) 1996-04-10
FR2680393B1 (de) 1995-05-24
FR2680393A1 (fr) 1993-02-19
DE69209746T2 (de) 1996-08-08

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