US3563051A - Apparatus for lubricating the compressor of a refrigerating installation - Google Patents

Apparatus for lubricating the compressor of a refrigerating installation Download PDF

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Publication number
US3563051A
US3563051A US847844A US3563051DA US3563051A US 3563051 A US3563051 A US 3563051A US 847844 A US847844 A US 847844A US 3563051D A US3563051D A US 3563051DA US 3563051 A US3563051 A US 3563051A
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United States
Prior art keywords
evaporator
conduit
oil
compressor
lubricating
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Expired - Lifetime
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US847844A
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English (en)
Inventor
Henri Baumgartner
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THERMOMECCANICA ITALIANA
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THERMOMECCANICA ITALIANA
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    • 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
    • F25B31/00—Compressor arrangements
    • F25B31/002—Lubrication

Definitions

  • This invention relates to apparatus for lubricating the compressor of a refrigerating installation.
  • An object of the present invention is a lubricating apparatus for the compressor of a refrigerating installation which will obviate the disadvantages of the known apparatus while enabling the necessary quantity of refrigerant to be reduced.
  • lubricating apparatus for the compressor of a refrigerating installation operating on a compression cycle comprising a first conduit connecting the upper part of the casing of the compressor to the suction side of the latter at a location where there exists a pressure lower than that which exists in the evaporator of the installation, a heat exchanger connected to the evaporator by a conduit for the flow of liquid refrigerating medium and to the upper part of the casing through a conduit for the discharge of refrigerating medium, a pump serving to aspirate oil from the casing and to return it through the exchanger in order to cool it, and a lubricating conduit for conveying the cooled oil to the bearings of the compressor.
  • FIG. 1 is a diagram of a refrigerating installation comprising one form of lubricating apparatus
  • FIG. 2 is a diagram of a modified form.
  • FIG. 1 shows a refrigerating installation comprising a compressor -1 connected through a suction conduit 2 to an evaporator 3 and through a return conduit 4 to a con denser 5.
  • a condensate conduit 6 provided with a reducing valve 7 connects the condenser 5 to the evaporator 3.
  • An electric motor M drives the compressor 1 having a drive shaft 8 mounted in bearings 9, 10 arranged in a casing 11 containing a bath 12 of lubricating oil.
  • the evaporator 3 is, in the example shown, of the type having tubes 13 immersed in a bath 114 of boiling refrigerating medium, for example Freon of the R12 type.
  • This refrigerating medium effects in this installation the wellknown cycle of refrigeration by compression, the medium which has evaporated in the evaporator 3 to a pressure P0 and a temperature T0 being aspirated through the compressor 1 and returned at a pressure Pc to the condenser 5 where it is condensed at a temperature Tc.
  • the conduit 6 leads the condensed refrigerating medium to the evaporator 3 after passing through the reducing valve 7 which reduces its pressure to the pressure P0.
  • the lubricating apparatus further comprises a conduit 15 connecting the upper part of the casing 11 to a venturi tube 16 arranged in a suction conduit 2 in such a way that the velocity of the gaseous refrigerating medium is increased and consequently the static pressure is diminished in the venturi tube 16.
  • the conduit 15 thus permits the gases located in the casing 11 to be extracted by the compressor 1 and the casing is thus maintained at a pressure P1 lower than the pressure P0 which exists in the evaporator 3.
  • the lubricating device comprises, in addition, a heat exchanger 17 for cooling the lubricating oil which is being withdrawn from the bath 12 in the casing 11 by means of a conduit 18 provided with a pump .19.
  • the cooled oil then passes from the exchanger 17, through the conduits 20, 21 and 22 to the bearings 9 and 10 in order to lubricate the latter and then flows into the oil bath 12.
  • the cooling is effected in the exchanger 17 by means of liquid refrigerating medium withdrawn from the bath 14 of evaporator 13 via a conduit 23, the heated refrigerating medium then passing in a conduit 24 leading into the upper part of casing 11.
  • the refrigerating medium thus flows from the evaporator 3 to the casing 11 due to the pressure difference PO-Pl.
  • casing -11 is arranged above the evaporator -3, there is a convection effect due to the boiling of the refrigerating medium in the exchanger 17 and in the vertical conduit 24.
  • the refrigerating medium thus evaporates while arriving at the upper part of casing 11 from where it is continually aspirated through conduit 15 by compressor 1.
  • the bearings of the compressor can be effectively lubricated while eliminating the onerous precautions at present necessary to prevent migration of oil in the installation and to remove oil which has accumulated in the evaporator.
  • the small quantity of oil contained in the bath 14 of refrigerant has no prejudicial effect on the transfer of heat in the evaporator 3; however, it causes foam to form in the latter so that the quantity of refrigerating medium necessary to form the bath 14 for immersing the cooling tubes 13 can be reduced. This presents an important economic advantage, in particular for large installations.
  • FIG. 2 represents a refrigerating installation similar to that described above and comprising a modified form of lubrication apparatus.
  • the latter also comprises a heat exchanger 17 for cooling lubricant oil drawn off from bath 12 of casing .11 through a conduit 18 provided with a pump 19.
  • a conduit 23 serves to withdraw liquid refrigerating medium from bath 14 and to lead it towards the exchanger 17 where it is heated and is then led through a conduit 24 in the upper part of casing 11.
  • a conduit 15 and a venturi 16 serve, as in the case of FIG. 1, to maintain casing 11 at a pressure P1 less than the pressure P existing in the evaporator 3 and thus to aspirate gaseous refrigerating medium from casing 11.
  • the cooled oil leaving the exchanger is led through a conduit 25 to a reservoir 26 to form in the latter a bath 27 of cold oil.
  • This reservoir 26 communicates at its upper part, through a conduit 28 with the evaporator 3 and at a location where the refrigerant medium contained in the latter is in the gaseous state.
  • the conduit 28 thus forms an overflow serving to return excess oil to the evaporator 3 where it mixes with the refrigerant medium of the bath 14.
  • the oil serving to lubricate the bearings of the compressor is drawn off from the bath 27 through conduit 20 and is led to the bearings 9 and through the conduits 21 and 22 respectively.
  • the pump 19 serves only to aspirate oil from casing 11 and to return it, through the exchanger 17 and conduit 25 to the reservoir 26.
  • the lubricating apparatus of the invention as described above thus comprises a primary circuit for circulation of oil and a secondary circuit for circulation of refrigerant medium.
  • This seconday circuit for cooling the oil also serves to recover the oil located in the evaporator and to return it to the casing.
  • conduit 23 preferably communicates with the evaporator 3 at a point where the oil concentration is high, for example the lowest point of the bath of boiling refrigerant.
  • the bath of boiling refrigerant in the evaporator contains a small percentage of lubricant oil, for example 5% by weight in the case of Freon 12, in order to form foam in the bath and enable the tubes to be immersed with a relatively small quantity of refrigerant medium.
  • the oil supply necessary for lubricating the bearings is of the order of 2 0 litres/minute, the oil becoming cooled from to 50%. Since the heat generated by friction in the casing is of the order of 3000K calories/hour, it is clear that the quantity of refrigerant medium withdrawn from the evaporator to effect the cooling of the oil is relatively small so that its effect on the efficiency of the installation is negligible.
  • apparatus for lubricating the compressor comprising a first conduit connecting the upper part of the casing of the compressor to the suction side of the latter at a location where there exists a pressure lower than that which exists in the evaporator of the installation, a heat exchanger connected to the evaporator by a conduit for the flow of liquid refrigerating medium and to the upper part of the casing through a conduit for the discharge of refrigerating medium, a pump serving to aspirate oil from the casing and to return it through the exchanger in order to cool it, and a lubricating conduit for conveying the cooled oil to the bearings of the compressor.
  • apparatus for lubricating the compressor further comprising a reservoir communicating at its upper part with the evaporator and at its lower part with the said lubricating conduit, said reservoir being fed with cooled lubricating oil from the heat exchanger.
  • apparatus for lubricating the compressor further comprising a venturi tube inserted into the suction conduit of the compessor and connected to the said conduit communicating with the upper part of the casing in such a way as to produce in the latter a pressure lower than that which exists in the evaporator.
  • apparatus for lubricating the compressor further comprising a venturi tube inserted into the suction conduit of the compessor and connected to the said conduit communicating with the upper part of the casing in such a way as to produce in the latter a pressure lower than that which exists in the evaporator.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)
  • Lubricants (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
US847844A 1968-08-13 1969-08-06 Apparatus for lubricating the compressor of a refrigerating installation Expired - Lifetime US3563051A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1217068A CH494934A (fr) 1968-08-13 1968-08-13 Installation frigorifique comprenant un dispositif de lubrification du compresseur

Publications (1)

Publication Number Publication Date
US3563051A true US3563051A (en) 1971-02-16

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ID=4380533

Family Applications (1)

Application Number Title Priority Date Filing Date
US847844A Expired - Lifetime US3563051A (en) 1968-08-13 1969-08-06 Apparatus for lubricating the compressor of a refrigerating installation

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US (1) US3563051A (enExample)
CH (1) CH494934A (enExample)
DE (1) DE1941553C3 (enExample)
FR (1) FR2015598A1 (enExample)
GB (1) GB1214589A (enExample)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3710590A (en) * 1971-07-19 1973-01-16 Vilter Manufacturing Corp Refrigerant cooled oil system for a rotary screw compressor
US3838581A (en) * 1973-10-29 1974-10-01 Carrier Corp Refrigerator apparatus including motor cooling means
US5603222A (en) * 1995-06-09 1997-02-18 Dube; Serge Cooling method and system for a compressor of a refrigerating system
US6170286B1 (en) 1999-07-09 2001-01-09 American Standard Inc. Oil return from refrigeration system evaporator using hot oil as motive force
US6341492B1 (en) 2000-05-24 2002-01-29 American Standard International Inc. Oil return from chiller evaporator
US20120192579A1 (en) * 2009-10-23 2012-08-02 Carrier Corporation Refrigerant vapor compression system operation
US20140165646A1 (en) * 2011-07-19 2014-06-19 Sascha Hellmann Oil Compensation In A Refrigeration Circuit
US9032753B2 (en) 2012-03-22 2015-05-19 Trane International Inc. Electronics cooling using lubricant return for a shell-and-tube style evaporator
US9032754B2 (en) 2012-03-22 2015-05-19 Trane International Inc. Electronics cooling using lubricant return for a shell-and-tube evaporator
US10240839B2 (en) 2013-03-15 2019-03-26 Trane International LLC. Apparatuses, systems, and methods of variable frequency drive operation and control

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2158248C2 (de) * 1971-11-24 1982-11-04 Bürkert GmbH, 7118 Ingelfingen Mehrwegemagnetventil mit Handbetätigung
US4032312A (en) * 1976-04-16 1977-06-28 Carrier Corporation Centrifugal compressor
EP0077599B1 (en) * 1981-10-16 1985-09-25 Borg-Warner Corporation Proportional solenoid valve
US4947887A (en) * 1981-10-16 1990-08-14 Borg-Warner Corporation Proportional solenoid valve
US4715396A (en) * 1981-10-16 1987-12-29 Borg-Warner Corporation Proportional solenoid valve
US4875499A (en) * 1981-10-16 1989-10-24 Borg-Warner Corporation Proportional solenoid valve
US4967781A (en) * 1989-04-05 1990-11-06 Borg-Warner Automotive Electronic & Mechanical Systems Corporation Proportional solenoid valve
US5027846A (en) * 1989-04-05 1991-07-02 Borg-Warner Automotive Electronic & Mechanical Proportional solenoid valve
US5110087A (en) * 1990-06-25 1992-05-05 Borg-Warner Automotive Electronic & Mechanical Systems Corporation Variable force solenoid hydraulic control valve
JP3219519B2 (ja) * 1993-02-12 2001-10-15 三洋電機株式会社 冷凍装置

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR680101A (fr) * 1928-10-18 1930-04-25 Sulzer Ag Dispositif de retour de l'huile de l'évaporateur dans le compresseur de machines frigorifiques
FR38425E (fr) * 1930-04-28 1931-06-03 Sulzer Ag Dispositif de retour de l'huile de l'évaporateur dans le compresseur de machines frigorifiques
US2145354A (en) * 1931-01-31 1939-01-31 Gen Motors Corp Refrigerating apparatus
GB506983A (en) * 1937-09-06 1939-06-07 Willy Hirche Lubricating device for compression refrigerators
DE703840C (de) * 1939-03-24 1941-03-17 Siemens Schuckertwerke Akt Ges Einrichtung zur Abfuhr der in einem Motorkompressoraggregat einer Kompressionskaeltemaschine frei werdenden Waerme
CH313859A (de) * 1953-05-21 1956-05-15 Sulzer Ag Verfahren und Vorrichtung zur Kühlung des Schmiermittels bei Kältemittelverdichtern
US3111819A (en) * 1961-11-03 1963-11-26 Bell & Gossett Co Evaporator with oil return means
US3163999A (en) * 1962-08-01 1965-01-05 Westinghouse Electric Corp Centrifugal compressor lubricating and motor cooling systems
FR1408672A (fr) * 1964-09-24 1965-08-13 Carrier Corp Système de séparation et de récupération de lubrifiant
FR1474303A (fr) * 1966-03-22 1967-03-24 Worthington Corp Appareil de réfrigération
US3389569A (en) * 1966-10-27 1968-06-25 Carrier Corp Method and apparatus for refrigeration machine lubrication
US3393528A (en) * 1966-12-01 1968-07-23 Carrier Corp Refrigeration machine with lubricant cooling

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3710590A (en) * 1971-07-19 1973-01-16 Vilter Manufacturing Corp Refrigerant cooled oil system for a rotary screw compressor
US3838581A (en) * 1973-10-29 1974-10-01 Carrier Corp Refrigerator apparatus including motor cooling means
US5603222A (en) * 1995-06-09 1997-02-18 Dube; Serge Cooling method and system for a compressor of a refrigerating system
US6170286B1 (en) 1999-07-09 2001-01-09 American Standard Inc. Oil return from refrigeration system evaporator using hot oil as motive force
US6341492B1 (en) 2000-05-24 2002-01-29 American Standard International Inc. Oil return from chiller evaporator
US10088202B2 (en) * 2009-10-23 2018-10-02 Carrier Corporation Refrigerant vapor compression system operation
US20120192579A1 (en) * 2009-10-23 2012-08-02 Carrier Corporation Refrigerant vapor compression system operation
US20140165646A1 (en) * 2011-07-19 2014-06-19 Sascha Hellmann Oil Compensation In A Refrigeration Circuit
US9970695B2 (en) * 2011-07-19 2018-05-15 Carrier Corporation Oil compensation in a refrigeration circuit
US9032754B2 (en) 2012-03-22 2015-05-19 Trane International Inc. Electronics cooling using lubricant return for a shell-and-tube evaporator
US9851130B2 (en) 2012-03-22 2017-12-26 Trane International Inc. Electronics cooling using lubricant return for a shell-and-tube style evaporator
US9032753B2 (en) 2012-03-22 2015-05-19 Trane International Inc. Electronics cooling using lubricant return for a shell-and-tube style evaporator
US10240839B2 (en) 2013-03-15 2019-03-26 Trane International LLC. Apparatuses, systems, and methods of variable frequency drive operation and control

Also Published As

Publication number Publication date
DE1941553C3 (de) 1980-01-31
GB1214589A (en) 1970-12-02
CH494934A (fr) 1970-08-15
DE1941553A1 (de) 1970-02-19
FR2015598A1 (enExample) 1970-04-30
DE1941553B2 (de) 1979-05-31

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