EP0964158A2 - Procédé d'opération d'une pompe pour refrigérants - Google Patents

Procédé d'opération d'une pompe pour refrigérants Download PDF

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Publication number
EP0964158A2
EP0964158A2 EP99111024A EP99111024A EP0964158A2 EP 0964158 A2 EP0964158 A2 EP 0964158A2 EP 99111024 A EP99111024 A EP 99111024A EP 99111024 A EP99111024 A EP 99111024A EP 0964158 A2 EP0964158 A2 EP 0964158A2
Authority
EP
European Patent Office
Prior art keywords
pump
refrigerant
operating
speed
refrigeration system
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.)
Withdrawn
Application number
EP99111024A
Other languages
German (de)
English (en)
Other versions
EP0964158A3 (fr
Inventor
Uwe Dipl.-Ing. Schierhorn
Janusz Dipl.-Ing. Olejnik
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.)
Linde GmbH
Original Assignee
Linde 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 Linde GmbH filed Critical Linde GmbH
Publication of EP0964158A2 publication Critical patent/EP0964158A2/fr
Publication of EP0964158A3 publication Critical patent/EP0964158A3/fr
Withdrawn legal-status Critical Current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
    • 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
    • F04B49/20—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 by changing the driving speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • 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
    • F04B2205/01—Pressure before the pump inlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/03—Cavitations

Definitions

  • the invention relates to a method for operating a pump for delivery boiling refrigerant or refrigerant.
  • the invention further relates to a method for operating a refrigeration system, consisting of at least one refrigerant circuit or consisting of at least a refrigerant circuit and at least one refrigerant circuit, the Pumping around the medium used as refrigerant or coolant at least one pump takes place.
  • Refrigeration plants of the generic type in which the pumping around as a refrigerant or the coolant used medium is carried out by means of at least one pump, are used, for example, to cool refrigerators and freezers in supermarkets used.
  • Such a refrigeration system is based on that shown in FIG. 1 Example explained in more detail.
  • FIG 1 the principle diagram of a refrigeration system is shown, which in essentially consists of two refrigerant circuits. These are about one Refrigerant separator A coupled together.
  • the refrigerant separator A becomes evaporated refrigerant drawn off via line 8, compressed in the compressor V. and then fed to condenser E4 via line 9. That in that Condenser E4 is then liquefied refrigerant via line 10
  • Relaxation organ a which is preferably - as shown in the figures - is a relief valve - supplied, relaxed in this and via line 11 in turn fed to the refrigerant separator A.
  • the refrigerant separator A becomes liquid refrigerant via line 1 removed and fed to the feed pump P.
  • Refrigerant is supplied via line 3, which is, for example, in three lines 4, 5 and 6 divides three consumers - in the figures as heat exchangers E1, E2 and E3 shown - fed.
  • the refrigerant is partially or completely contained in these evaporates and then again via line 7 to the refrigerant separator A fed.
  • the object of the present invention is a method for operating a pump to promote boiling refrigerants or refrigerants and a process for Operate a refrigeration system, to avoid the disadvantages mentioned.
  • the inventive method for operating a pump and the Methods according to the invention for operating a refrigeration system are thereby characterized in that at least when due to the operating conditions Cavitation and / or a stall in the pump is expected, the speed the pump is lowered.
  • Lowering the pump speed results in a reduction in the NPSH value Episode.
  • a reduction in the NPSH value for example, in a carbon dioxide freezer, by lowering the network frequency from 50 Hertz to 30 Hertz a reduction in the NPSH value of 0.4 m to 0.2 m can be achieved. This shows that a decrease in the mains frequency by 40% results in a 50% reduction in the NPSH value - the NPSH value that is, it drops disproportionately towards zero.
  • the reduction in the NPSH value leads to a corresponding reduction in the risk of damage the pump due to cavitation and / or stalling.
  • the pump speed is reduced to the minimum permissible operating speed usually sufficient to protect the pump from damage due to To preserve cavitation and / or stall.
  • the speed of the pump is advantageously reduced whenever the compressor steps up in its stages.
  • Another advantageous embodiment of the inventive method for This means operating a pump and operating a refrigeration system characterized in that the speed reduction depending on the Pressure drop rate occurs. The one required for this control effort is comparatively low.
  • the options mentioned can be combined. Generally can the speed can be reduced using a frequency converter. Such a circuit can be supported by timers.
  • substantially larger pressure fluctuations can now be made a pump or within a refrigeration system than previously realized by the static liquid columns is possible to be compensated.
  • Figure 2 shows the principle diagram of a refrigeration system, the refrigerant circuit and has a coolant circuit.
  • the two circuits are over the Refrigerant separator A coupled together.
  • the heat exchange between the Refrigerant of the refrigerant circuit and the refrigerant of the refrigerant circuit takes place via the arranged inside the refrigerant separator A.
  • the speed of the pump P is reduced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Reciprocating Pumps (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP99111024A 1998-06-12 1999-06-11 Procédé d'opération d'une pompe pour refrigérants Withdrawn EP0964158A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19826292 1998-06-12
DE1998126292 DE19826292A1 (de) 1998-06-12 1998-06-12 Verfahren zum Betreiben einer Pumpe zur Förderung siedender Kältemittel oder Kälteträger

Publications (2)

Publication Number Publication Date
EP0964158A2 true EP0964158A2 (fr) 1999-12-15
EP0964158A3 EP0964158A3 (fr) 2000-08-16

Family

ID=7870739

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99111024A Withdrawn EP0964158A3 (fr) 1998-06-12 1999-06-11 Procédé d'opération d'une pompe pour refrigérants

Country Status (2)

Country Link
EP (1) EP0964158A3 (fr)
DE (1) DE19826292A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1593851A2 (fr) 2004-05-04 2005-11-09 Wilo Ag Méthode pour la désaération de pompes centrifuges
WO2008112566A3 (fr) * 2007-03-09 2009-02-05 Johnson Controls Tech Co Système de réfrigération
WO2009122455A1 (fr) * 2008-04-04 2009-10-08 Giuseppe Floris Echangeur de chaleur fonctionnant à différentes pressions
CN103062968A (zh) * 2011-10-18 2013-04-24 株式会社日立工业设备技术 冷却系统以及冷却方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020203486A1 (de) 2020-03-18 2021-09-23 Robert Bosch Gesellschaft mit beschränkter Haftung Verfahren zum Betrieb einer Fluidfördervorrichtung

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH651111A5 (fr) * 1982-07-28 1985-08-30 Cerac Inst Sa Installation de pompage et procede de mise en action de celle-ci.
DE3509072A1 (de) * 1985-03-14 1986-09-25 Klaus Dipl.-Ing.(FH) 3200 Hildesheim Metzger Verfahren zur kavitations-einstellung
DE3520538A1 (de) * 1985-06-07 1986-12-11 Kraftwerk Union AG, 4330 Mülheim Verfahren und einrichtung zum betrieb einer kreiselpumpe
DE3520734A1 (de) * 1985-06-10 1986-12-11 Kraftwerk Union AG, 4330 Mülheim Verfahren und einrichtung zum betrieb einer kreiselpumpe
DE8625036U1 (de) * 1986-09-16 1987-01-15 Knoche Gesellschaft für Kälte- und Klimatechnik mbH, 1000 Berlin Kühlvorrichtung
US4913625A (en) * 1987-12-18 1990-04-03 Westinghouse Electric Corp. Automatic pump protection system
DE4010049C1 (en) * 1990-03-29 1991-10-10 Grundfos International A/S, Bjerringbro, Dk Pump unit for heating or cooling circuit - uses frequency regulator to reduce rotation of pump motor upon detected overheating
DE4128032A1 (de) * 1991-08-23 1993-02-25 Zwerschina Alois Vorrichtung zur optimierbaren vorfoerderung siedender fluessigkeiten fuer rotierende pumpen
DE59400789D1 (de) * 1993-04-08 1996-11-14 Vogel Pumpen Anlage mit mindestens einer Flüssigkeitspumpe
DE4422297C1 (de) * 1994-06-25 1995-08-31 Viessmann Werke Kg Steuerung von Umwälzpumpen
DE19534464C1 (de) * 1995-09-16 1996-12-05 Rowenta Werke Gmbh Vorrichtung zur Verhinderung des Trockenlaufens bei elektromagnetischen Schwingkolbenpumpen
DE19605312A1 (de) * 1996-02-14 1997-08-21 Zimmermann Wolfgang Maßnahmen zur Vermeidung von Pulsation bei Pumpen und Kompressoren
DE19645129A1 (de) * 1996-11-04 1998-05-07 Abb Patent Gmbh Verfahren zum kavitiationsfreien Betrieb einer drehzahlgeregelten Pumpe

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1593851A2 (fr) 2004-05-04 2005-11-09 Wilo Ag Méthode pour la désaération de pompes centrifuges
EP1593851A3 (fr) * 2004-05-04 2010-12-29 Wilo Ag Méthode pour la désaération de pompes centrifuges
WO2008112566A3 (fr) * 2007-03-09 2009-02-05 Johnson Controls Tech Co Système de réfrigération
WO2009122455A1 (fr) * 2008-04-04 2009-10-08 Giuseppe Floris Echangeur de chaleur fonctionnant à différentes pressions
CN103062968A (zh) * 2011-10-18 2013-04-24 株式会社日立工业设备技术 冷却系统以及冷却方法
EP2584288A3 (fr) * 2011-10-18 2014-03-05 Hitachi Plant Technologies, Ltd. Système de refroidissement et procédé de refroidissement

Also Published As

Publication number Publication date
DE19826292A1 (de) 1999-12-23
EP0964158A3 (fr) 2000-08-16

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