US3777509A - Oil return system for refrigeration apparatus - Google Patents

Oil return system for refrigeration apparatus Download PDF

Info

Publication number
US3777509A
US3777509A US00233895A US3777509DA US3777509A US 3777509 A US3777509 A US 3777509A US 00233895 A US00233895 A US 00233895A US 3777509D A US3777509D A US 3777509DA US 3777509 A US3777509 A US 3777509A
Authority
US
United States
Prior art keywords
oil
circuit
compressor
crankcase
receiver
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.)
Expired - Lifetime
Application number
US00233895A
Inventor
P Muench
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.)
York International Corp
Original Assignee
Borg Warner Corp
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 Borg Warner Corp filed Critical Borg Warner Corp
Application granted granted Critical
Publication of US3777509A publication Critical patent/US3777509A/en
Assigned to YORK INTERNATIONAL CORPORATION, 631 SOUTH RICHLAND AVENUE, YORK, PA 17403, A CORP. OF DE reassignment YORK INTERNATIONAL CORPORATION, 631 SOUTH RICHLAND AVENUE, YORK, PA 17403, A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BORG-WARNER CORPORATION
Assigned to CANADIAN IMPERIAL BANK OF COMMERCE reassignment CANADIAN IMPERIAL BANK OF COMMERCE SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: YORK INTERNATIONAL CORPORATION
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • F25B31/00—Compressor arrangements
    • F25B31/002—Lubrication
    • F25B31/004—Lubrication oil recirculating 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
    • F25B2341/00—Details of ejectors not being used as compression device; Details of flow restrictors or expansion valves
    • F25B2341/001—Ejectors not being used as compression device
    • F25B2341/0016—Ejectors for creating an oil recirculation
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/01—Heaters
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/07—Details of compressors or related parts
    • F25B2400/075—Details of compressors or related parts with parallel compressors
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/03—Oil level

Definitions

  • Such means may take the form of an eductor [56] Refere Cit d powered by flow of lubricating oil in a closed circuit UNITED STATES PATENTS with respect to the compressor. 1,899,378 2/1933 Zouck 62/471 2 Claims, 1 Drawing Figure CONDENSER EVAPORATOR COMPRESSOR 52 on. STILL 5o SIGHT GLASS COM PR E550 Q BACKGROUND AND SUMMARY OF THE INVENTION Thisinvention relates to an oil return system for refrigeration apparatus.
  • an oil separator is used to protectthe compressor from liquidrefrigerant and/or oil returninginquantity through the suction line to the compressori
  • the oil separator operates to separate refrigerant from the oil, the oil being transferred to an oil receiver, which may also be a still, for return to the compressor crankcase.
  • the present invention contemplates an oil return system featuring means, suchas an eductor, designed to be powered by main oil pressure from the compressor lubricating system and topositively effect flow of oil from a lower pressure reservoir into a compressor crankcase which is normally maintained at a higher pressure.
  • Another object of the invention is to provide an improved oil return system in which an eductor is disposed in a closed compressor lubricating oil circuit and powered by flow of oil therein to compel flow of oil from a reservoir into the circuit and thereby intothe compressor crankcase.
  • FIGURE is a schematic diagram of a refrigeration system utilizing the oil return system of the present invention.
  • FIG. 1 there is shown a refrigeration system employing a pair of compressors op erating in parallel to feed a single condenser and single evaporator, although various combinations of multiple condenser and evaporator systems, which are familiar to thoseskilled in the art, may be employed.
  • Compressors and 12 dischargehot gas into respective outlet lines 14 and 16 which are connected to a common hot gas discharge line 18.
  • the gas passes through an oil separator 20 of any common type and is delivered through line 22 to condenser 24. Gas then flows through a re-..
  • a thermostatic valve or an orifice 26 into an evaporator 30, which iscommonly of the flooded type.
  • the suction gas, leaving the evaporator, is delivered to what is referred to as a dead-end trap 32 which is adapted to eliminate any trace of oil carried in the suction gas to prevent the same from flowing into the suction side of the compressors.
  • the suction gas passes through line 38 which is joined to suction lines 40 and 42 of compressors 10 and 12, respectively.
  • Oil, separated from the discharge gas is delivered by a line 44 to a still and receiver 50 where the refrigerant is boiled off and returned to the suction side of the system preferably to trap 32 through line 54. At the same time, the oil, separated from the suction gas, is deliv ered to the still through line 56.
  • the oil makeup system includes eductor 58 which, in effect, operates as a pump driven by oil circulating in line 60 and is responsive to the pressure generated by the oil circulating system in the compressor 10. In this way, the relatively low pressure oil in the still 50 and flowing in lines 62 and 64 is positively driven into the oil return system by being aspirated into the return stream by the eductor 58.
  • the oil is continuously circulating through a pressure-responsive valve 65 (sensing oil pressure through line 61) which has a minimum setting of about 100 psi and a maximum setting of 150 psi.
  • the oil level float switch 66 completes an electric circuit to activate a solenoid valve 68 in line 64 to permit the oil in still 50 to enter the suction side of the eductor.
  • the switch 66 will open to deenergize the solenoid of the valve 68 and valve 68 closes to discontinue oil flow from still 50 to the eductor.
  • the same manner of operation applies to oil circulating line 71, pressure sensing line 73, eductor 70, pressure-responsive valve 72, oil level switch 76, and solenoid valve 74 on compressor 12.
  • Check valves 69 and 75 are employed to prevent back flow of oil from the compressor to the oil still.
  • a feature of the invention resides in the use of oilsampling line directly connected to the evaporator 30 and to line 56which permits oil to flow into the still 50 via line '56 when an electric heater element 82 and solenoid 84 of valve 86 are energized, valve 86 being opened by activating solenoid 84.
  • Solenoid 84 and electric heater element 82 may be operatively interconnected by control line 90 so that they are energized simultaneously by suitable means (not shown). This will assure that the heater will be in operation to boil off refrigerant flowing from evaporator 30 through valve 86 to the oil still 50.
  • the oil return system can operate with unequal compressor loadings or crankcase pressures; a minimumquantity of oil is in circulation through the oil still and receiver; there is more positive draining of the dead-end trap 32; simplicity of piping and equalizing of the oil still isrealized; and the system is in operation at all times that the compressor is operating.
  • a refrigeration system including a compressor having an oil-carrying crankcase; an oil separator connected to the high pressure side of said compressor to effect separation of oil from the refrigerant; means pro viding a closed lubricant oil circuit in fluid communication with said crankcase of said compressor; an oil receiver connected to the oil discharge side of said oil separator and to said circuit, said receiver containing oil under pressure lower than the pressure of the oil in said crankcase; and eductor means in said circuit and operative, in response to the pressure generated by the oil circulating in said circuit, to effect flow of oil from said receiver into said circuit.
  • a refrigeration system as defined in claim 1 including a conduit connecting said receiver to said closed lubricant oil circuit; means for sensing the oil level in'said crankcase; and valve means associated with said con duit and responsive to said oil level sensing means for permitting oil in said receiver to flow through said conduit into said circuit by the operation of said eductor whenever said oil level is less than a predetermined value.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)

Abstract

Apparatus for assuring return of oil separated from refrigerant in a vapor cycle refrigeration system. Means are provided for positively effecting flow of oil from a lower pressure reservoir into a crankcase of a compressor which is normally maintained at a higher pressure. Such means may take the form of an eductor powered by flow of lubricating oil in a closed circuit with respect to the compressor.

Description

United States Patent 1 1 Muench 1 1 Dec. 11, 1973 1 41 OIL RETURN SYSTEM FOR 2,4 8, 4/1947 Zwiclrl 1. 62/470 REFRIGERATON APPARATUS 2,892,320 6/1959 Quick 62/471 2,975,613 3/1961 Heid0rr1.... 62/471 Inventor Paul Muench, Medford Lakes, 3,304,697 2/1967 Ramsey 62/471 NJ. 3,360,958 1/1968 Miner 62/470 [73] Assignee: Borg-Warner Corporation, Chicago, 1
11L Primary Examiner-Meyer Perlin Attorney-Donald W. Banner et al. [22] Filed: Mar. 13, 1972 [21] Appl. No.2 233,895 [57] ABSTRACT Apparatus for assuring return of oil separated from re- [52] US. Cl. 62/470, 62/192 frigerant in a vapor cycle r geration system. Means [51] Int. Cl. F25b 43/02 are provided for p e y e fect ng flo of oil from a [58] Field of Search 62/84, 192, 193, lower pressure reservoir into a crankcase of a 62/194, 470, 471, 472, 473 pressor which is normally maintained at a higher pressure. Such means may take the form of an eductor [56] Refere Cit d powered by flow of lubricating oil in a closed circuit UNITED STATES PATENTS with respect to the compressor. 1,899,378 2/1933 Zouck 62/471 2 Claims, 1 Drawing Figure CONDENSER EVAPORATOR COMPRESSOR 52 on. STILL 5o SIGHT GLASS COM PR E550 Q BACKGROUND AND SUMMARY OF THE INVENTION Thisinvention relates to an oil return system for refrigeration apparatus.
In vapor cycle refrigeration systems, refrigerants pro cess considerable affinity for lubricant oil used in com- A pressors of such systems, so that mixtures of the oil and refrigerants occur. Since lubricating oil destroys the high operating efficiency of the evaporator, itis most desirable to recover the oil circulating with the refrigerant leaving the compressor and return it to the com- I pressor crankcase. Forthis purpose, an oil separator is used to protectthe compressor from liquidrefrigerant and/or oil returninginquantity through the suction line to the compressoriThe oil separator operates to separate refrigerant from the oil, the oil being transferred to an oil receiver, which may also be a still, for return to the compressor crankcase. Whenthe pressure of the oilinthe crankcase is higher than the pressure of the oil in the oil receiver, it is necessary to employ means to transfer the oil to the higher pressure chamber. While a mechanical pump can beused to perform this function, the pump has a multiplicity of moving parts subject to wear and deterioration, in addition to requiring an electrical or other source of motive power necessitating controls for its correct operation. While other liquid transfer means have been suggested, such means have been found to be incapable of transferring theoil if considerablepressure differences exist between the oil receiver and the compressor crankcase.
The present invention contemplates an oil return system featuring means, suchas an eductor, designed to be powered by main oil pressure from the compressor lubricating system and topositively effect flow of oil from a lower pressure reservoir into a compressor crankcase which is normally maintained at a higher pressure.
It is an object of the invention to provide an improved oil return system for refrigeration apparatus.
Another object of the invention is to provide an improved oil return system in which an eductor is disposed in a closed compressor lubricating oil circuit and powered by flow of oil therein to compel flow of oil from a reservoir into the circuit and thereby intothe compressor crankcase.
Additional objects and advantages will be apparent from the following detailed description taken in conjunction with the drawing.
DESCRIPTION OF THE DRAWING The single FIGURE is a schematic diagram of a refrigeration system utilizing the oil return system of the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the FIGURE, there is shown a refrigeration system employing a pair of compressors op erating in parallel to feed a single condenser and single evaporator, although various combinations of multiple condenser and evaporator systems, which are familiar to thoseskilled in the art, may be employed. Compressors and 12 dischargehot gas into respective outlet lines 14 and 16 which are connected to a common hot gas discharge line 18. The gas passes through an oil separator 20 of any common type and is delivered through line 22 to condenser 24. Gas then flows through a re-..
striction, such as provided by a thermostatic valve or an orifice 26, into an evaporator 30, which iscommonly of the flooded type. The suction gas, leaving the evaporator, is delivered to what is referred to as a dead-end trap 32 which is adapted to eliminate any trace of oil carried in the suction gas to prevent the same from flowing into the suction side of the compressors. The suction gas passes through line 38 which is joined to suction lines 40 and 42 of compressors 10 and 12, respectively.
Oil, separated from the discharge gas, is delivered by a line 44 to a still and receiver 50 where the refrigerant is boiled off and returned to the suction side of the system preferably to trap 32 through line 54. At the same time, the oil, separated from the suction gas, is deliv ered to the still through line 56.
The refrigerant-free oil, which is collected in the still, is available for use in the compressors in the event the oil level in either one of them drops below a predetermined point.
The oil makeup system includes eductor 58 which, in effect, operates as a pump driven by oil circulating in line 60 and is responsive to the pressure generated by the oil circulating system in the compressor 10. In this way, the relatively low pressure oil in the still 50 and flowing in lines 62 and 64 is positively driven into the oil return system by being aspirated into the return stream by the eductor 58. In practice, the oil is continuously circulating through a pressure-responsive valve 65 (sensing oil pressure through line 61) which has a minimum setting of about 100 psi and a maximum setting of 150 psi. When the oil level in the compressor crankcase drops to a dangerous level, the oil level float switch 66 completes an electric circuit to activate a solenoid valve 68 in line 64 to permit the oil in still 50 to enter the suction side of the eductor. When the oil level is brought up to the proper point, the switch 66 will open to deenergize the solenoid of the valve 68 and valve 68 closes to discontinue oil flow from still 50 to the eductor. The same manner of operation applies to oil circulating line 71, pressure sensing line 73, eductor 70, pressure-responsive valve 72, oil level switch 76, and solenoid valve 74 on compressor 12. Check valves 69 and 75 are employed to prevent back flow of oil from the compressor to the oil still.
A feature of the invention resides in the use of oilsampling line directly connected to the evaporator 30 and to line 56which permits oil to flow into the still 50 via line '56 when an electric heater element 82 and solenoid 84 of valve 86 are energized, valve 86 being opened by activating solenoid 84. Solenoid 84 and electric heater element 82 may be operatively interconnected by control line 90 so that they are energized simultaneously by suitable means (not shown). This will assure that the heater will be in operation to boil off refrigerant flowing from evaporator 30 through valve 86 to the oil still 50.
In the preferred embodiment of the invention, the oil return system can operate with unequal compressor loadings or crankcase pressures; a minimumquantity of oil is in circulation through the oil still and receiver; there is more positive draining of the dead-end trap 32; simplicity of piping and equalizing of the oil still isrealized; and the system is in operation at all times that the compressor is operating.
It will be apparent that, while this invention has been described in connection with a refrigeration system employing dual compressors operating in parallel to supply a single condenser and evaporator, it is believed obvious the invention can be used in a refrigeration system employing a single compressor. Also, the use of an oil still or oil receiver is optional. Accordingly, it is to be understood that the described preferred embodiment of the invention is by way of illustration and not by way of limitation; and the scope of the appended claims should be construed as broadly as the prior art will permit.
What is claimed is: I
1. In a refrigeration system including a compressor having an oil-carrying crankcase; an oil separator connected to the high pressure side of said compressor to effect separation of oil from the refrigerant; means pro viding a closed lubricant oil circuit in fluid communication with said crankcase of said compressor; an oil receiver connected to the oil discharge side of said oil separator and to said circuit, said receiver containing oil under pressure lower than the pressure of the oil in said crankcase; and eductor means in said circuit and operative, in response to the pressure generated by the oil circulating in said circuit, to effect flow of oil from said receiver into said circuit.
2. A refrigeration system as defined in claim 1 including a conduit connecting said receiver to said closed lubricant oil circuit; means for sensing the oil level in'said crankcase; and valve means associated with said con duit and responsive to said oil level sensing means for permitting oil in said receiver to flow through said conduit into said circuit by the operation of said eductor whenever said oil level is less than a predetermined value.

Claims (2)

1. In a refrigeration system including a compressor having an oil-carrying crankcase; an oil separator connected to the high pressure side of said compressor to effect separation of oil from the refrigerant; means providing a closed lubricant oil circuit in fluid communication with said crankcase of said compressor; an oil receiver connected to the oil discharge side of said oil separator and to said circuit, said receiver containing oil under pressure lower than the pressure of the oil in said crankcase; and eductor means in said circuit and operative, in response to the pressure generated by the oil circulating in said circuit, to effect flow of oil from said receiver into said circuit.
2. A refrigeration system as defined in claim 1 including a conduit connecting said receiver to said closed lubricant oil circuit; means for sensing the oil level in said crankcase; and valve means associated with said conduit and responsive to said oil level sensing means for permitting oil in said receiver to flow through said conduit into said circuit by the operation of said eductor whenever said oil level is less than a predetermined value.
US00233895A 1972-03-13 1972-03-13 Oil return system for refrigeration apparatus Expired - Lifetime US3777509A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US23389572A 1972-03-13 1972-03-13

Publications (1)

Publication Number Publication Date
US3777509A true US3777509A (en) 1973-12-11

Family

ID=22879100

Family Applications (1)

Application Number Title Priority Date Filing Date
US00233895A Expired - Lifetime US3777509A (en) 1972-03-13 1972-03-13 Oil return system for refrigeration apparatus

Country Status (1)

Country Link
US (1) US3777509A (en)

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4187695A (en) * 1978-11-07 1980-02-12 Virginia Chemicals Inc. Air-conditioning system having recirculating and flow-control means
US4310338A (en) * 1980-03-31 1982-01-12 Virginia Chemicals Inc. Replaceable float oil separator
FR2508980A1 (en) * 1981-07-06 1983-01-07 Dunham Bush Inc OIL DISTRIBUTION DEVICE FOR COMPRESSORS CONNECTED IN PARALLEL
US4750337A (en) * 1987-10-13 1988-06-14 American Standard Inc. Oil management in a parallel compressor arrangement
EP0490810A1 (en) * 1990-12-11 1992-06-17 Gebrüder Sulzer Aktiengesellschaft Method of operating an NH3-refrigerator or -heat pump
US5265432A (en) * 1992-09-02 1993-11-30 American Standard Inc. Oil purifying device for use with a refrigeration system
US5435144A (en) * 1994-02-24 1995-07-25 Kalmbach; John Compressor lubricant distributing system for motor vehicles having auxiliary air conditioning
US5437162A (en) * 1993-07-21 1995-08-01 Eden; Herbert R. Closed loop oil service system for AC or refrigerant compressor units
US5570590A (en) * 1993-02-19 1996-11-05 A'gramkow A/S Refrigerant reclaiming method and system
US5598714A (en) * 1993-02-19 1997-02-04 Rti Technologies, Inc. Method and apparatus for separation of refrigerant from a purge gas mixture of refrigerant and non-condensible gas
US5737929A (en) * 1994-03-28 1998-04-14 Cool Engineering Method and means for separating oil and impurities from a refrigerant in an air conditioning system
US6182467B1 (en) * 1999-09-27 2001-02-06 Carrier Corporation Lubrication system for screw compressors using an oil still
WO2001040659A1 (en) * 1999-12-03 2001-06-07 American Standard Inc. Refrigeration chiller oil recovery employing high pressure oil as eductor motive fluid
US6428296B1 (en) 2001-02-05 2002-08-06 Copeland Corporation Horizontal scroll compressor having an oil injection fitting
US20030188576A1 (en) * 2002-04-04 2003-10-09 Park Gile Jun Yang Engine oil auto-add system
US6672102B1 (en) * 2002-11-27 2004-01-06 Carrier Corporation Oil recovery and lubrication system for screw compressor refrigeration machine
EP1672298A2 (en) * 2004-12-15 2006-06-21 Lg Electronics Inc. Air conditioner
US20060171831A1 (en) * 2005-01-28 2006-08-03 Elson John P Scroll machine
EP1886077A1 (en) * 2005-05-30 2008-02-13 Johnson Controls Denmark ApS Oil separation in a cooling circuit
WO2008112593A1 (en) * 2007-03-09 2008-09-18 Johnson Controls Technology Company Refrigeration system
US20090136372A1 (en) * 2007-11-27 2009-05-28 Elson John P Open drive scroll compressor with lubrication system
US7566210B2 (en) 2005-10-20 2009-07-28 Emerson Climate Technologies, Inc. Horizontal scroll compressor
US20140165646A1 (en) * 2011-07-19 2014-06-19 Sascha Hellmann Oil Compensation In A Refrigeration Circuit
EP3059523A1 (en) * 2015-02-18 2016-08-24 Heatcraft Refrigeration Products LLC Oil line control system
CN109237829A (en) * 2017-07-10 2019-01-18 荏原冷热系统株式会社 Compression refrigerating machine
US10935292B2 (en) 2018-06-14 2021-03-02 Trane International Inc. Lubricant quality management for a compressor
US11421681B2 (en) * 2018-04-19 2022-08-23 Emerson Climate Technologies, Inc. Multiple-compressor system with suction valve and method of controlling suction valve
US11435116B2 (en) 2017-09-25 2022-09-06 Johnson Controls Tyco IP Holdings LLP Two step oil motive eductor system
US11892211B2 (en) 2021-05-23 2024-02-06 Copeland Lp Compressor flow restrictor
WO2024044407A1 (en) * 2022-08-23 2024-02-29 Bauer Compressors, Inc. Compressor crankcase oil reclamation system

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1899378A (en) * 1926-10-20 1933-02-28 Servel Inc Method of and apparatus for separating a liquid from other liquids
US2892320A (en) * 1955-05-31 1959-06-30 Lester K Quick Liquid level control in refrigeration system
US2975613A (en) * 1959-01-23 1961-03-21 Gen Motors Corp Refrigerating apparatus with aspirator in a by-pass
US3304697A (en) * 1964-05-21 1967-02-21 Worthington Corp Oil separator
US3360958A (en) * 1966-01-21 1968-01-02 Trane Co Multiple compressor lubrication apparatus
US3418962A (en) * 1966-04-04 1968-12-31 Harold H. Seward Automobile stop-start indicator

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1899378A (en) * 1926-10-20 1933-02-28 Servel Inc Method of and apparatus for separating a liquid from other liquids
US2892320A (en) * 1955-05-31 1959-06-30 Lester K Quick Liquid level control in refrigeration system
US2975613A (en) * 1959-01-23 1961-03-21 Gen Motors Corp Refrigerating apparatus with aspirator in a by-pass
US3304697A (en) * 1964-05-21 1967-02-21 Worthington Corp Oil separator
US3360958A (en) * 1966-01-21 1968-01-02 Trane Co Multiple compressor lubrication apparatus
US3418962A (en) * 1966-04-04 1968-12-31 Harold H. Seward Automobile stop-start indicator

Cited By (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4187695A (en) * 1978-11-07 1980-02-12 Virginia Chemicals Inc. Air-conditioning system having recirculating and flow-control means
US4310338A (en) * 1980-03-31 1982-01-12 Virginia Chemicals Inc. Replaceable float oil separator
FR2508980A1 (en) * 1981-07-06 1983-01-07 Dunham Bush Inc OIL DISTRIBUTION DEVICE FOR COMPRESSORS CONNECTED IN PARALLEL
US4383802A (en) * 1981-07-06 1983-05-17 Dunham-Bush, Inc. Oil equalization system for parallel connected compressors
US4750337A (en) * 1987-10-13 1988-06-14 American Standard Inc. Oil management in a parallel compressor arrangement
FR2621654A1 (en) * 1987-10-13 1989-04-14 American Standard Inc OIL MANAGEMENT DEVICE OF A PARALLEL COMPRESSOR REFRIGERATION FACILITY, THIS REFRIGERATION FACILITY AND A CONTINUOUS LUBRICATING OIL DISTRIBUTION APPARATUS
EP0490810A1 (en) * 1990-12-11 1992-06-17 Gebrüder Sulzer Aktiengesellschaft Method of operating an NH3-refrigerator or -heat pump
CH683028A5 (en) * 1990-12-11 1993-12-31 Sulzer Ag Method for operating a NH (3) or refrigeration system -Wärmepumpe.
US5265432A (en) * 1992-09-02 1993-11-30 American Standard Inc. Oil purifying device for use with a refrigeration system
US5598714A (en) * 1993-02-19 1997-02-04 Rti Technologies, Inc. Method and apparatus for separation of refrigerant from a purge gas mixture of refrigerant and non-condensible gas
US5570590A (en) * 1993-02-19 1996-11-05 A'gramkow A/S Refrigerant reclaiming method and system
US5437162A (en) * 1993-07-21 1995-08-01 Eden; Herbert R. Closed loop oil service system for AC or refrigerant compressor units
US5440897A (en) * 1993-07-21 1995-08-15 Eden; Herbert R. Closed loop oil service system for AC or refrigerant compressor units
US5444988A (en) * 1993-07-21 1995-08-29 Eden; Herbert R. Closed loop oil charging for ac or refrigerant compressor units
US5460005A (en) * 1993-07-21 1995-10-24 Eden; Herbert R. Closed loop oil service system for AC or refrigerant compressor units
US5435144A (en) * 1994-02-24 1995-07-25 Kalmbach; John Compressor lubricant distributing system for motor vehicles having auxiliary air conditioning
US5737929A (en) * 1994-03-28 1998-04-14 Cool Engineering Method and means for separating oil and impurities from a refrigerant in an air conditioning system
US6182467B1 (en) * 1999-09-27 2001-02-06 Carrier Corporation Lubrication system for screw compressors using an oil still
WO2001040659A1 (en) * 1999-12-03 2001-06-07 American Standard Inc. Refrigeration chiller oil recovery employing high pressure oil as eductor motive fluid
US6428296B1 (en) 2001-02-05 2002-08-06 Copeland Corporation Horizontal scroll compressor having an oil injection fitting
US20030188576A1 (en) * 2002-04-04 2003-10-09 Park Gile Jun Yang Engine oil auto-add system
US6672102B1 (en) * 2002-11-27 2004-01-06 Carrier Corporation Oil recovery and lubrication system for screw compressor refrigeration machine
EP1672298A2 (en) * 2004-12-15 2006-06-21 Lg Electronics Inc. Air conditioner
EP1672298A3 (en) * 2004-12-15 2011-01-19 LG Electronics, Inc. Air conditioner
US20060171831A1 (en) * 2005-01-28 2006-08-03 Elson John P Scroll machine
US7186099B2 (en) 2005-01-28 2007-03-06 Emerson Climate Technologies, Inc. Inclined scroll machine having a special oil sump
EP1886077A1 (en) * 2005-05-30 2008-02-13 Johnson Controls Denmark ApS Oil separation in a cooling circuit
US7566210B2 (en) 2005-10-20 2009-07-28 Emerson Climate Technologies, Inc. Horizontal scroll compressor
WO2008112593A1 (en) * 2007-03-09 2008-09-18 Johnson Controls Technology Company Refrigeration system
WO2008112594A3 (en) * 2007-03-09 2008-11-13 Johnson Controls Tech Co Vapor compression system
WO2008112594A2 (en) * 2007-03-09 2008-09-18 Johnson Controls Technology Company Vapor compression system
US20090136372A1 (en) * 2007-11-27 2009-05-28 Elson John P Open drive scroll compressor with lubrication system
US8747088B2 (en) 2007-11-27 2014-06-10 Emerson Climate Technologies, Inc. Open drive scroll compressor with lubrication system
US9970695B2 (en) * 2011-07-19 2018-05-15 Carrier Corporation Oil compensation in a refrigeration circuit
US20140165646A1 (en) * 2011-07-19 2014-06-19 Sascha Hellmann Oil Compensation In A Refrigeration Circuit
EP3059523A1 (en) * 2015-02-18 2016-08-24 Heatcraft Refrigeration Products LLC Oil line control system
CN109237829A (en) * 2017-07-10 2019-01-18 荏原冷热系统株式会社 Compression refrigerating machine
US11435116B2 (en) 2017-09-25 2022-09-06 Johnson Controls Tyco IP Holdings LLP Two step oil motive eductor system
US11421681B2 (en) * 2018-04-19 2022-08-23 Emerson Climate Technologies, Inc. Multiple-compressor system with suction valve and method of controlling suction valve
US10935292B2 (en) 2018-06-14 2021-03-02 Trane International Inc. Lubricant quality management for a compressor
US11892211B2 (en) 2021-05-23 2024-02-06 Copeland Lp Compressor flow restrictor
WO2024044407A1 (en) * 2022-08-23 2024-02-29 Bauer Compressors, Inc. Compressor crankcase oil reclamation system

Similar Documents

Publication Publication Date Title
US3777509A (en) Oil return system for refrigeration apparatus
US3301002A (en) Conditioning apparatus
US4589263A (en) Multiple compressor oil system
US3370438A (en) Condensing pressure controls for refrigeration system
US2677944A (en) Plural stage refrigeration apparatus
US3766745A (en) Refrigeration system with plural evaporator means
US2434221A (en) Control means for plural stage refrigerating systems
US3580006A (en) Central refrigeration system with automatic standby compressor capacity
US3357199A (en) Multiple condenser refrigeration systems
US3645109A (en) Refrigeration system with hot gas defrosting
US2244312A (en) Refrigeration system
US2133962A (en) Refrigerating apparatus
US2175913A (en) Motor-compressor unit for refrigerating apparatus
US3621670A (en) Lubricating oil equalizing system
US2684579A (en) Apparatus for cooling oil of refrigerant compressors
US2456386A (en) Cascade refrigeration unit with controls therefor
US2500688A (en) Refrigerating apparatus
US3620038A (en) Purging apparatus for refrigeration system
US2123497A (en) Two-temperature refrigerating apparatus
US2165741A (en) Compressor unloader
US2145354A (en) Refrigerating apparatus
US2606430A (en) Automatic lubrication means for plural stage compressors
US2178100A (en) Refrigerating condensing unit
US2253623A (en) Refrigerating apparatus
US3108453A (en) Refrigerating apparatus including heat exchange stabilizer means

Legal Events

Date Code Title Description
STCF Information on status: patent grant

Free format text: PATENTED FILE - (OLD CASE ADDED FOR FILE TRACKING PURPOSES)

AS Assignment

Owner name: YORK INTERNATIONAL CORPORATION, 631 SOUTH RICHLAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST. EFFECTIVE;ASSIGNOR:BORG-WARNER CORPORATION;REEL/FRAME:004676/0360

Effective date: 19860609

AS Assignment

Owner name: CANADIAN IMPERIAL BANK OF COMMERCE

Free format text: SECURITY INTEREST;ASSIGNOR:YORK INTERNATIONAL CORPORATION;REEL/FRAME:005156/0705

Effective date: 19881215