EP3674555B1 - Volumetrische hilfspumpe zur erzeugung von vakuum - Google Patents

Volumetrische hilfspumpe zur erzeugung von vakuum Download PDF

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Publication number
EP3674555B1
EP3674555B1 EP19216999.3A EP19216999A EP3674555B1 EP 3674555 B1 EP3674555 B1 EP 3674555B1 EP 19216999 A EP19216999 A EP 19216999A EP 3674555 B1 EP3674555 B1 EP 3674555B1
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EP
European Patent Office
Prior art keywords
pressure
control unit
value
pump
discharge duct
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Active
Application number
EP19216999.3A
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English (en)
French (fr)
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EP3674555A1 (de
Inventor
Marco Zucchini
Michele DI PADOVA
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DVP Vacuum Technology SpA
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DVP Vacuum Technology SpA
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Publication of EP3674555A1 publication Critical patent/EP3674555A1/de
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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
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C18/126—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with radially from the rotor body extending elements, not necessarily co-operating with corresponding recesses in the other rotor, e.g. lobes, Roots type
    • 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
    • F04C25/00—Adaptations of pumps for special use of pumps for elastic fluids
    • F04C25/02—Adaptations of pumps for special use of pumps for elastic fluids for producing high vacuum
    • 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
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/06—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids 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
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/08—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by varying the rotational speed
    • 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
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/05—Speed
    • 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
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/07—Electric current
    • 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
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/18—Pressure

Definitions

  • This invention relates to an auxiliary volumetric pump for generating a vacuum.
  • volumetric auxiliary pump means a "booster" pump, generally called a “roots” pump or a rotary lobes pump, positioned upstream of a primary pump, for example of the rotary blade type, for generating a vacuum in systems in which it is necessary to manage high fluid flow rates and to speed up the emptying time of the system.
  • control on the absorption of the electric current does not protect the pump against faults or malfunctions caused, for example, by abnormal pressure conditions, at the inlet and/or at the outlet of the pump.
  • WO2018/010970A1 discloses an auxiliary volumetric pump according to the preamble of claim 1.
  • an auxiliary pump for generating a vacuum comprising a casing, a rotary member housed in the casing and an electric motor for powering the rotary member.
  • the auxiliary pump comprises an intake duct, located downstream of a user device, and a discharge duct configured to define a delivery duct of a primary pump.
  • a device for detecting the pressure of the fluid entering the auxiliary pump designed for emitting a signal for detecting the pressure of the fluid entering the auxiliary pump, is positioned in the intake duct.
  • a device for detecting the pressure of the fluid leaving the auxiliary pump designed for emitting a signal for detecting the pressure of the fluid leaving the auxiliary pump, is positioned in the discharge duct.
  • a control unit is configured to receive and process the signal for detecting the pressure of the fluid entering and flowing out from the auxiliary pump and determining the pressure of the fluid in the intake duct and in the discharge duct and the pressure difference between the pressure value in the intake duct and in the discharge duct.
  • the control unit is configured for controlling the frequency of rotation and the absorption of the electric motor by the rotary member as a function of the pressure difference between the pressure value in the intake duct and in the discharge duct, if less than a pre-set permissible pressure difference.
  • this operating mode protects the electric motor of the auxiliary pump against malfunctions or faults since the current absorption is determined by the pressure difference between the pressure value in the intake duct and in the discharge duct, below the threshold value declared by the manufacturer of the auxiliary pump.
  • Thenumeral 1 denotes an auxiliary volumetric pump for generating the vacuum according to the invention.
  • the auxiliary pump 1 comprises an intake duct 2 and a discharge duct 3.
  • the intake duct 2 is located downstream of a user device 24, with reference to the direction of flow of the fluid.
  • the discharge duct 3 is configured to define a delivery duct of a primary pump 4.
  • the primary pump 4 is positioned downstream of the auxiliary pump 1, with reference to the direction of flow of the fluid.
  • a device for detecting the pressure 5 of the fluid entering the auxiliary pump 1 designed for emitting a signal for detecting the pressure 8 of the fluid entering the auxiliary pump 1, is positioned in the intake duct 2.
  • a device for detecting the pressure 6 of the fluid flowing out from the auxiliary pump 1, designed for emitting a signal for detecting the pressure 9 of the fluid flowing out of the auxiliary pump 1, is positioned in the discharge duct 3.
  • a control unit 7 is configured for receiving and processing the signal for measuring the pressure 8 of the fluid entering the auxiliary pump 1 and determining the pressure of the fluid in the intake duct 2.
  • the control unit 7 is configured for receiving and processing the signal for measuring the pressure 9 of the fluid flowing out from the auxiliary pump 1 and determining the pressure of the fluid in the discharge duct 3.
  • the control unit 7 is configured to receive and process the signals for detecting the pressure 8, 9 of the fluid entering and flowing out and determining the pressure difference between the pressure value in the intake duct 2 and in the discharge duct 3.
  • the control unit 7 is configured for controlling the frequency of rotation and the absorption of the electric motor 21 by the rotary member 11 as a function of the pressure difference between the pressure value in the intake duct and in the discharge duct, if less than a pre-set permissible pressure difference.
  • the control unit 7 is configured for comparing the value of the pressure of the fluid in the discharge duct 3 with a threshold pressure value.
  • control unit 7 determines that the value of the pressure in the discharge duct 3 is greater than the threshold pressure value for a set period of time, the control unit 7 is configured to emit a first alarm signal 16.
  • This malfunction condition that is to say, a pressure in the discharge duct 3 between the auxiliary pump 1 and the primary pump 4, may occur, for example, if the primary pump 4 is subject to a malfunction, the primary pump 4 switched off.
  • the control unit 7 is configured for comparing the value of the pressure of the fluid in the discharge duct 3 with a control pressure value.
  • control unit 7 determines that the pressure value in the discharge duct 3 is less than the control pressure value, the control unit 7 does not take any action.
  • control unit 7 determines that the pressure value in the discharge duct 3 is greater than the control pressure value, the control unit 7 is configured for storing the value of the pressure determined by means of the signal for measuring the pressure 9 of the fluid flowing out from the auxiliary pump 1.
  • the control unit 7 is configured for continuously measuring the pressure values determined by means of the respective signals for measuring the pressure 9 of the fluid flowing out from the auxiliary pump 1.
  • the control unit 7 is configured to determine whether or not the new pressure values are within a range of pressure values defined by the pressure value stored in a respective time interval.
  • control unit 7 determines that the pressure values are within said range of pressure values, according to a respective time interval, the control unit 7 is configured to send a second alarm signal 17.
  • control unit 7 determines that the new pressure value is not within the range of pressure values, the control unit 7 is configured for storing the new pressure value and, after a predetermined period of time, the control unit 7 is configured for measuring a new pressure value determined by the detection signal of the pressure 9 of the fluid flowing out from the auxiliary pump 1 and determining again if the new pressure value is within said range of pressure values defined by the value of the last pressure value stored.
  • the auxiliary pump 1 comprises a device for measuring the frequency 20 of the electric motor and is configured for emitting a signal for measuring the frequency 22 of the electric motor 21.
  • control unit 7 determines that the value of the frequency of the electric motor 21 is less than the pre-set minimum frequency value for a pre-set period of time, the control unit 7 is configured to emit a third alarm signal 18.
  • the minimum frequency set is the frequency necessary to guarantee the circulation of lubricating liquid in the auxiliary pump 1.
  • This malfunction condition that is to say, a minimum frequency which continues over time, may occur, for example, when the ratio of the flow rate between auxiliary pump 1 and primary pump 4 is too high, over-absorbing, the primary pump 4 switched off.
  • the auxiliary pump 1 comprises a casing 10 and a rotary member 11 housed in the casing 10.
  • An electric motor 21 powers the rotary member 11.
  • the rotary member 11 comprises at least a first lobe 12, rotating about its own axis 12a of rotation, and a second lobe 13, rotating about its own axis 13a of rotation.
  • the first lobe 12 and the second lobe 13 rotate in a synchronous fashion about the respective axes of rotation 12a, 13a for conveying the fluid from the intake duct 2 to the discharge duct 3.
  • a device 14 for measuring the temperature is positioned on the casing 10. More specifically, the device 14 for measuring the temperature is positioned on the casing 10 in a zone close to the discharge duct 3.
  • the temperature measuring device 14 is configured to measure the temperature of the casing 10 and to emit a warning signal 15 indicating that the temperature has been exceeded a maximum permitted temperature value.
  • the temperature measuring device 14 comprises an electrical circuit equipped with a switch whose opening or closing is determined by the temperature of the casing 10 exceeding a maximum permitted temperature value.
  • the control unit 7 is configured to receive the warning signal 15 of the temperature measuring device 14 and, upon receiving it, to emit a fourth alarm signal 19.
  • This condition of malfunction may occur, for example, if the ambient temperature in which the auxiliary pump 1 is positioned is high, the level or viscosity of the oil is high, the clearances of the rotary member 11 are too high, the suction filter of the auxiliary pump 1 is dirty or due to overloading of the auxiliary pump 1.
  • a display device 23 is configured to receive the first, second, third and fourth alarm signals 16, 17, 18, 19 emitted by the control unit 7 and make it visible to an operator.
  • the display device 23 makes available the alarm signals by means of a warning light.
  • control unit 7 is configured for controlling the switching off of the auxiliary pump 1, that is to say, for controlling the interruption of the electric motor 21 for powering the rotary member 11 upon the emission of at least one of the above-mentioned alarm signals 16, 17, 18, 19.

Landscapes

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

Claims (8)

  1. Volumetrische Hilfspumpe zur Erzeugung von Vakuum, umfassend ein Gehäuse (10), ein Drehglied (11), das in dem Gehäuse (10) untergebracht ist, und einen Elektromotor (21) zum Antreiben des Drehglieds (11); wobei die Hilfspumpe (1) einen Einlasskanal (2), der sich stromabwärts einer Benutzervorrichtung (24) befindet, und einen Auslasskanal (3), der konfiguriert ist, um einen Förderkanal einer Primärpumpe (4) zu definieren, umfasst;
    eine Vorrichtung zum Erfassen des Drucks (5) des in die Hilfspumpe (1) eintretenden Fluids, die zum Ausgeben eines Signals zum Erfassen des Drucks (8) des in die Hilfspumpe (1) eintretenden Fluids ausgelegt ist, ist im Einlasskanal (2) positioniert; die volumetrische Hilfspumpe ist dadurch gekennzeichnet, dass sie ferner eine Vorrichtung zum Erfassen des Drucks (6) des aus der Hilfspumpe (1) austretenden Fluids umfasst, die zum Ausgeben eines Signals zum Erfassen des Drucks (9) des aus der Hilfspumpe (1) austretenden Fluids ausgelegt und im Auslasskanal (3) positioniert ist;
    eine Steuereinheit (7), die konfiguriert ist, um das Signal zum Erfassen des Drucks (8, 9) des in die Hilfspumpe (1) eintretenden und aus dieser austretenden Fluids zu empfangen und zu verarbeiten und den Druck des Fluids im Einlasskanal (2) und im Auslasskanal (3) und die Druckdifferenz zwischen dem Druckwert im Ansaugkanal (2) und im Auslasskanal (3) zu bestimmen;
    die Steuereinheit (7) ist konfiguriert, um die Drehfrequenz und die Absorption des Elektromotors (21) durch das Drehglied (11) als Funktion der Druckdifferenz zwischen dem Druckwert im Einlasskanal (2) und im Auslasskanal (3) zu steuern, wenn weniger als eine voreingestellte zulässige Druckdifferenz vorliegt.
  2. Pumpe nach unabhängigem Anspruch 1, dadurch gekennzeichnet, dass die Steuereinheit (7) zum Vergleichen des Druckwerts des Fluids im Auslasskanal (3) mit einem voreingestellten Schwellendruckwert konfiguriert ist; wobei die Steuereinheit (7) so konfiguriert ist, dass sie bestimmt, ob der Wert des Drucks im Auslasskanal (3) größer als der für einen festgelegten Zeitraum eingestellte Schwellendruckwert ist, und, falls dies der Fall ist, ein erstes Alarmsignal (16) ausgibt.
  3. Pumpe nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Steuereinheit (7) zum kontinuierlichen Vergleichen eines jeden Wertes des im Auslasskanal (3) erfassten Fluiddrucks mit einem voreingestellten Steuerdruckwert konfiguriert ist; wobei die Steuereinheit (7) konfiguriert ist, um zu bestimmen, ob der Wert des Drucks im Auslasskanal (3) kleiner als ein voreingestellter Steuerdruckwert ist und ob der Wert des Drucks im Auslasskanal (3) größer als der Steuerdruckwert ist, wobei die Steuereinheit (7) konfiguriert ist, um diesen Druckwert zu speichern, und die Steuereinheit (7) nach einer vorbestimmten Zeitdauer konfiguriert ist, um zu bestimmen, ob ein neuer in dem Auslasskanal (3) gemessener Druckwert innerhalb eines Bereichs von Druckwerten liegt oder nicht, der durch den zuvor gespeicherten Druckwert definiert ist; wenn der neue Druckwert innerhalb des Bereichs der Druckwerte liegt, ist die Steuereinheit (7) so konfiguriert, dass sie ein zweites Alarmsignal (17) aussendet; wenn der neue Druckwert nicht innerhalb des Bereichs der Druckwerte liegt, ist die Steuereinheit (7) so konfiguriert, dass sie die Abfolge der Vorgänge wiederholt, bis ein neuer Druckwert innerhalb des Bereichs der Druckwerte liegt.
  4. Pumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sie eine Vorrichtung zum Messen der Frequenz (20) des Elektromotors umfasst, die zum Ausgeben eines Signals zum Messen der Frequenz (22) des Elektromotors (21) ausgelegt ist; die Steuereinheit (7) ist konfiguriert, um zu bestimmen, ob der Wert der Frequenz des Elektromotors (21) für einen voreingestellten Zeitraum kleiner als der voreingestellte minimale Frequenzwert ist, und, falls dies der Fall ist, ein drittes Alarmsignal (18) auszugeben.
  5. Pumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sie eine Vorrichtung zum Messen der Temperatur (14) umfasst, die auf der Oberfläche des Gehäuses (10) positioniert ist, insbesondere in einem Bereich des Gehäuses (10) in der Nähe des Auslasskanals (3), die zum Messen der Temperatur des Gehäuses (10) und zum Ausgeben eines Warnsignals (15) konfiguriert ist, dass die Temperatur einen maximal zulässigen Temperaturwert überschritten hat; wobei die Steuereinheit (7) so konfiguriert ist, dass sie das Warnsignal (15) der Temperaturmessvorrichtung (14) empfängt und bei dessen Empfang ein viertes Alarmsignal (19) ausgibt.
  6. Pumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sie eine Anzeigevorrichtung (23) umfasst, die konfiguriert ist, um die ersten, zweiten, dritten und vierten Alarmsignale (16, 17, 18, 19) zu empfangen, die von der Steuereinheit (7) ausgegeben werden und für einen Bediener sichtbar zu machen; vorzugsweise stellt die Anzeigevorrichtung (23) die Alarmsignale (16, 17, 18, 19) mittels einer Warnleuchte zur Verfügung.
  7. Pumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Steuereinheit (7) konfiguriert ist, um das Abschalten der Hilfspumpe (1) zu steuern, insbesondere um die Unterbrechung des Elektromotors (21) zu steuern, der das Drehglied (11) nach Ausgeben mindestens eines der ersten, zweiten, dritten und vierten Alarmsignale (16, 17, 18, 19) antreibt.
  8. Anlage zur Erzeugung von Vakuum, umfassend die Hilfspumpe nach einem der Ansprüche 1 bis 7 und eine Primärpumpe (4), die stromabwärts der Hilfspumpe (1), in Bezug auf die Strömungsrichtung des Fluids angeordnet ist; wobei der Einlasskanal (2) der Hilfspumpe (1) stromabwärts einer Benutzervorrichtung (24) in Bezug auf die Strömungsrichtung des Fluids angeordnet ist.
EP19216999.3A 2018-12-27 2019-12-17 Volumetrische hilfspumpe zur erzeugung von vakuum Active EP3674555B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102018000021148A IT201800021148A1 (it) 2018-12-27 2018-12-27 Pompa ausiliaria volumetrica per la generazione del vuoto.

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Publication Number Publication Date
EP3674555A1 EP3674555A1 (de) 2020-07-01
EP3674555B1 true EP3674555B1 (de) 2021-05-26

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IT (1) IT201800021148A1 (de)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE58907121D1 (de) * 1989-06-06 1994-04-07 Leybold Ag Zwei- oder mehrstufige Hochvakuumpumpe.
JP4745779B2 (ja) * 2005-10-03 2011-08-10 神港精機株式会社 真空装置
EP3198148B1 (de) * 2014-09-26 2020-02-26 Ateliers Busch S.A. Vakuumerzeugendes pumpsystem und pumpverfahren mit diesem pumpsystem
FR3054005B1 (fr) * 2016-07-13 2018-08-24 Pfeiffer Vacuum Procede de descente en pression dans un sas de chargement et de dechargement et groupe de pompage associe

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IT201800021148A1 (it) 2020-06-27

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