EP0042117A2 - Heat pump - Google Patents

Heat pump Download PDF

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Publication number
EP0042117A2
EP0042117A2 EP81104327A EP81104327A EP0042117A2 EP 0042117 A2 EP0042117 A2 EP 0042117A2 EP 81104327 A EP81104327 A EP 81104327A EP 81104327 A EP81104327 A EP 81104327A EP 0042117 A2 EP0042117 A2 EP 0042117A2
Authority
EP
European Patent Office
Prior art keywords
heat pump
refrigerant circuit
capillary tube
line
pressure
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Withdrawn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
EP81104327A
Other languages
German (de)
French (fr)
Other versions
EP0042117A3 (en
Inventor
Dieter Kühl
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.)
Kkw Kulmbacher Klimagerate-Werk GmbH
Original Assignee
Kkw Kulmbacher Klimagerate-Werk 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 Kkw Kulmbacher Klimagerate-Werk GmbH filed Critical Kkw Kulmbacher Klimagerate-Werk GmbH
Publication of EP0042117A2 publication Critical patent/EP0042117A2/en
Publication of EP0042117A3 publication Critical patent/EP0042117A3/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/022—Compressor control arrangements
    • 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
    • F25B29/00—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
    • F25B29/003—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously of the compression type system
    • 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
    • F25B2500/26—Problems to be solved characterised by the startup of the refrigeration cycle
    • 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
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/026—Compressor control by controlling unloaders
    • F25B2600/0261—Compressor control by controlling unloaders external to the compressor

Definitions

  • the invention relates to a heat pump according to the preamble of claim 1.
  • a heat pump of the type mentioned in the preamble of claim 1 is already known.
  • the line arranged between the suction side and the pressure side of the refrigerant circuit contains a solenoid valve which is opened when the heat pump is at a standstill so that the pressure between the suction side and the pressure side of the refrigerant circuit is equalized.
  • a solenoid valve is relatively expensive. It is heavily loaded and can cause malfunctions as well as loss of performance if contaminated.
  • the object of the invention is to improve the heat pump of the type mentioned in the preamble of claim 1.
  • the object is achieved by the training specified in the characterizing part of claim 1.
  • the solution found has the advantage that it does not have any moving and therefore fault-prone parts for the device required for starting current reduction are required and that a considerable cost saving is achieved by eliminating the solenoid valve.
  • FIG. 1 An embodiment of the invention is shown in the drawing, which shows a refrigerant circuit of a heat pump.
  • 1 denotes a compressor of a refrigerant circuit of a heat pump.
  • the reference number 2 applies to the condenser, the reference number 3 to the evaporator and the reference number 4 to the expansion device of the refrigerant circuit.
  • the suction side of the refrigerant circuit has reference number 5 and the pressure side of the refrigerant circuit has reference number 6.
  • the refrigerant circuit also has a check valve 7 and a line 8.
  • the line 8 is designed for pressure equalization between the suction side 5 and the pressure side 6 of the refrigerant circuit and consists of a capillary tube.
  • the check valve is arranged in the pressure side 6 of the refrigerant circuit behind the connection of the line 8.
  • the capillary tube line 8 is designed in cross-section so that after the compressor 1 of the heat pump is switched off, a pressure equalization between the suction side 5 and the pressure side 6 of the refrigerant circuit occurs within approximately two minutes. Experiments have shown that the line 8, which is also continuous during the heat pump operation, only reduces the heating power of the heat pump by approximately 1%.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)

Abstract

In a heat pump the drive motor of the compressor absorbs a very high current on starting up unless special precautions are taken, because it has to work against high pressure differences in the refrigerant circuit. In order to avoid a high starting current it is already known to dispose a solenoid valve in a line extending between the suction and delivery sides of the refrigerant circuit of the heat pump, and to open this valve in order to achieve pressure equalisation between the suction side and the delivery side during the starting of the drive motor. However, the valve must also work under high pressure. It is liable to fail and in addition is expensive. A simplification is sought. In a heat pump having between its suction side (5) and its delivery side (6) a line (8) provided for pressure equalisation this simplification is achieved by making the line (8) in the form of a capillary tube. Because of the capillary tube pressure equalisation is achieved spontaneously when the heat pump is stopped. The power loss in the heat pump brought about by the capillary tube during operation of the heat pump is very slight. <IMAGE>

Description

Die Erfindung bezieht sich auf eine Wärmepumpe nach dem Oberbegriff des Anspruches 1.The invention relates to a heat pump according to the preamble of claim 1.

Es ist bereits eine Wärmepumpe der im Oberbegriff des Anspruches 1 genannten Art bekannt. Die hierbei zwischen der Saugseite und der Druckseite des Kältemittelkreislaufes angeordnete Leitung enthält ein Magnetventil, welches bei stillstehender Wärmepumpe geöffnet wird, damit sich der Druck zwischen der Saugseite und der Druckseite des Kältemittelkreislaufes ausgleicht. Ein solcher Druckausgleich ist erforderlich, um eine hohe Stromaufnahme des Verdichtermotors zu vermeiden, die dann eintreten würde, wenn der Verdichter beim Anlaufen gegen eine hohe Druckdifferenz im Kältemittelkreislauf arbeiten müßte. Ein Magnetventil ist jedoch verhältnismäßig teuer. Es ist stark belastet und kann Störungen hervorrufen sowie bei Verschmutzungen Leistungsverluste verursachen.A heat pump of the type mentioned in the preamble of claim 1 is already known. The line arranged between the suction side and the pressure side of the refrigerant circuit contains a solenoid valve which is opened when the heat pump is at a standstill so that the pressure between the suction side and the pressure side of the refrigerant circuit is equalized. Such a pressure equalization is necessary to avoid a high current consumption of the compressor motor, which would occur if the compressor had to work against a high pressure difference in the refrigerant circuit when starting. However, a solenoid valve is relatively expensive. It is heavily loaded and can cause malfunctions as well as loss of performance if contaminated.

Aufgabe der Erfindung ist es, die Wärmepumpe der im Oberbegriff des Anspruches 1 genannten Art zu verbessern.The object of the invention is to improve the heat pump of the type mentioned in the preamble of claim 1.

Die gestellte Aufgabe wird erfindungsgemäß durch die im kennzeichnenden Teil des Anspruches 1 angegebene Ausbildung gelöst.The object is achieved by the training specified in the characterizing part of claim 1.

Die gefundene Lösung hat den Vorteil, daß keine beweglichen und somit störanfälligen Teile für die zur Anlaufstromverminderung notwendige Einrichtung erforderlich sind und daß durch Wegfall des Magnetventils eine beachtliche Kosteneinsparung erreicht wird.The solution found has the advantage that it does not have any moving and therefore fault-prone parts for the device required for starting current reduction are required and that a considerable cost saving is achieved by eliminating the solenoid valve.

Eine zweckmäßige Ausbildung des Erfindungsgegenstandes ist in Anspruch 2 angegeben.A useful embodiment of the subject of the invention is specified in claim 2.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt, die einen Kältemittelkreislauf einer Wärmepumpe zeigt.An embodiment of the invention is shown in the drawing, which shows a refrigerant circuit of a heat pump.

In der Zeichnung ist mit 1 ein Verdichter eines Kältemittelkreislaufes einer Wärmepumpe bezeichnet. Das Bezugszeichen 2 gilt für den Kondensator, das Bezugszeichen 3 für den Verdampfer und das Bezugszeichen 4 für die Expansionseinrichtung des Kältemittelkreislaufes.In the drawing, 1 denotes a compressor of a refrigerant circuit of a heat pump. The reference number 2 applies to the condenser, the reference number 3 to the evaporator and the reference number 4 to the expansion device of the refrigerant circuit.

Die Saugseite des Kaltemittelkreislaufes trägt das Bezugszeichen 5 und die Druckseite des Kältemittelkreislaufes das Bezugszeichen 6.The suction side of the refrigerant circuit has reference number 5 and the pressure side of the refrigerant circuit has reference number 6.

Der Kältemittelkreislauf weist ferner ein Rückschlagventil 7 und eine Leitung 8 auf. Die Leitung 8 ist zum Druckausgleich zwischen der Saugseite 5 und der Druckseite 6 des Kältemittelkreislaufes ausgebildet und besteht aus einem Kapillar-Rohr. Das Rückschlagventil ist in der Druckseite 6 des Kältemittelkreislaufes hinter dem Anschluß der Leitung 8 angeordnet.The refrigerant circuit also has a check valve 7 and a line 8. The line 8 is designed for pressure equalization between the suction side 5 and the pressure side 6 of the refrigerant circuit and consists of a capillary tube. The check valve is arranged in the pressure side 6 of the refrigerant circuit behind the connection of the line 8.

Die Kapillar-Rohr-Leitung 8 ist im Querschnitt so ausgelegt, daß sich nach Abschalten des Verdichters 1 der Wärmepumpe innerhalb von etwa zwei Minuten ein Druckausgleich zwischen der Saugseite 5 und der Druckseite 6 des Kältemittelkreislaufes einstellt. Versuche haben ergeben, daß die auch während des Wärmepumpenbetriebes durchgängige Leitung 8 die Heizleistung der Wärmepumpe nur um etwa 1% mindert.The capillary tube line 8 is designed in cross-section so that after the compressor 1 of the heat pump is switched off, a pressure equalization between the suction side 5 and the pressure side 6 of the refrigerant circuit occurs within approximately two minutes. Experiments have shown that the line 8, which is also continuous during the heat pump operation, only reduces the heating power of the heat pump by approximately 1%.

Versuche haben ferner ergeben, daß die Anordnung eines Kapillarrohres zwischen der Saugseite und der Druckseite des Kältemittelkreislaufes besonders wirksam bei solchen Wärmepumpen ist, in deren Kältemittelkreislauf mindestens zwei Verdichter angeordnet sind.Tests have also shown that the arrangement of a capillary tube between the suction side and the pressure side of the refrigerant circuit is particularly effective in those heat pumps in whose refrigerant circuit at least two compressors are arranged.

Claims (2)

1. Wärmepumpe, deren Kältemittelkreislauf eine zum Druckausgleich zwischen der Saugseite und der Druckseite ausgebildete Leitung aufweist, dadurch gekennzeichnet, daß die Leitung (8) aus einem Kapillar-Rohr besteht.1. Heat pump, the refrigerant circuit has a line designed to equalize pressure between the suction side and the pressure side, characterized in that the line (8) consists of a capillary tube. 2. Wärmepumpe nach Anspruch 1, dadurch gekennzeichnet, daß der Querschnitt des Kapillar-Rohres (8) so ausgebildet ist, daß sich nach dem Abschalten des Verdichters (1) der Wärmepumpe innerhalb von etwa zwei Minuten ein Druckausgleich zwischen der Saugseite (5) und der Druckseite (6) des Kältemittelkreislaufes einstellt.2. Heat pump according to claim 1, characterized in that the cross section of the capillary tube (8) is designed so that after switching off the compressor (1) of the heat pump within about two minutes, a pressure equalization between the suction side (5) and the pressure side (6) of the refrigerant circuit.
EP81104327A 1980-06-18 1981-06-04 Heat pump Withdrawn EP0042117A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8016104U 1980-06-18
DE19808016104U DE8016104U1 (en) 1980-06-18 1980-06-18 HEAT PUMP

Publications (2)

Publication Number Publication Date
EP0042117A2 true EP0042117A2 (en) 1981-12-23
EP0042117A3 EP0042117A3 (en) 1982-06-02

Family

ID=6716369

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81104327A Withdrawn EP0042117A3 (en) 1980-06-18 1981-06-04 Heat pump

Country Status (2)

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EP (1) EP0042117A3 (en)
DE (1) DE8016104U1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994018512A1 (en) * 1993-02-09 1994-08-18 Empresa Brasileira De Compressores S/A - Embraco Starting arrangement for small refrigeration systems

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7260951B2 (en) 2001-04-05 2007-08-28 Bristol Compressors International, Inc. Pressure equalization system

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2314591A (en) * 1940-06-20 1943-03-23 Gen Motors Corp Refrigerating apparatus
DE1051878B (en) * 1957-03-02 1959-03-05 Licencia Talalmanyokat Process for the combined operation of refrigeration machine and heat pump as well as equipment for carrying out the process
DE1163863B (en) * 1960-12-06 1964-02-27 Linde Eismasch Ag Device for the automatic relieved start-up of refrigeration compressors
US3495418A (en) * 1968-04-18 1970-02-17 Garrett Corp Refrigeration system with compressor unloading means
US3855813A (en) * 1973-08-01 1974-12-24 A Laurent Compressor control for refrigeration system
JPS53128037A (en) * 1977-04-15 1978-11-08 Hitachi Ltd Refrigeration apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2314591A (en) * 1940-06-20 1943-03-23 Gen Motors Corp Refrigerating apparatus
DE1051878B (en) * 1957-03-02 1959-03-05 Licencia Talalmanyokat Process for the combined operation of refrigeration machine and heat pump as well as equipment for carrying out the process
DE1163863B (en) * 1960-12-06 1964-02-27 Linde Eismasch Ag Device for the automatic relieved start-up of refrigeration compressors
US3495418A (en) * 1968-04-18 1970-02-17 Garrett Corp Refrigeration system with compressor unloading means
US3855813A (en) * 1973-08-01 1974-12-24 A Laurent Compressor control for refrigeration system
JPS53128037A (en) * 1977-04-15 1978-11-08 Hitachi Ltd Refrigeration apparatus

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Handbuch der Kaltetechnik, Sechster Band, Teil A, "Automatik-Zubehor-Inbetriebname-Gerauschbekampfung-Kalteanlagen-Warmepumpen" 1969, seiten 467-468 Springer Verlag, Berlin, DE H.L. VON CUBE: "Die Warmepumpe" *
PATENTS ABSTRACTS OF JAPAN, Band 3, Nr. 4, 17. Januar 1979, seite 57 M 45 & JP - A - 53 128037 (Hitachi Seisakusho K.K.) (08-11-1978) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994018512A1 (en) * 1993-02-09 1994-08-18 Empresa Brasileira De Compressores S/A - Embraco Starting arrangement for small refrigeration systems
US5651267A (en) * 1993-02-09 1997-07-29 Empresa Brasileira De Compressores S/A - Embraco Starting arrangement for small refrigeration systems

Also Published As

Publication number Publication date
DE8016104U1 (en) 1980-09-11
EP0042117A3 (en) 1982-06-02

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Inventor name: KUEHL, DIETER