EP1851491A2 - Compressor system with controlled lubricant reclaim - Google Patents
Compressor system with controlled lubricant reclaimInfo
- Publication number
- EP1851491A2 EP1851491A2 EP05723228A EP05723228A EP1851491A2 EP 1851491 A2 EP1851491 A2 EP 1851491A2 EP 05723228 A EP05723228 A EP 05723228A EP 05723228 A EP05723228 A EP 05723228A EP 1851491 A2 EP1851491 A2 EP 1851491A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- lubricant
- mixture
- compressor
- reclaim
- evaporator
- 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.)
- Granted
Links
- 239000000314 lubricant Substances 0.000 title claims abstract description 76
- 239000000203 mixture Substances 0.000 claims abstract description 51
- 239000006200 vaporizer Substances 0.000 claims abstract description 35
- 239000003507 refrigerant Substances 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 13
- 230000000153 supplemental effect Effects 0.000 claims description 5
- 238000007789 sealing Methods 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 238000005461 lubrication Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
- F25B1/04—Compression machines, plants or systems with non-reversible cycle with compressor of rotary type
- F25B1/047—Compression machines, plants or systems with non-reversible cycle with compressor of rotary type of screw type
-
- 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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2515—Flow valves
-
- 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
- F25B2700/21—Temperatures
- F25B2700/2105—Oil temperatures
-
- 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
- F25B2700/21—Temperatures
- F25B2700/2117—Temperatures of an evaporator
Definitions
- the invention relates to compressor systems and, more particularly, the invention relates to a system and method for controlled recovery of lubricant for such systems .
- Compressors for example screw compressors, are commonly used in various applications including, for example, water-cooled chillers.
- a typical compressor requires oil to lubricate bearings, seals, gaps between rotors and between the rotors and adjacent stationary components such as the housing and end plates, and the like.
- the bearing load carrying capacity depends heavily upon oil viscosity. Further, the sealing characteristics of the oil are dependent upon viscosity.
- the oil to provide such sealing and lubrication is typically circulated through the system along with refrigerant. Oil entrained with the refrigerant is circulated from the compressor discharge through the system. [0006] Separation and recycle of this oil, while maintaining acceptable oil viscosity, is a pressing need in the industry. [0007] It is therefore a primary object of the present invention to provide a system and method whereby recovery of the oil and desired viscosity levels are efficiently accomplished and maintained.
- a compressor system with controlled lubricant reclaim comprises a compressor circuit comprising a compressor, condenser and an evaporator connected by refrigerant flow lines; a lubricant circuit for circulating lubricant to the compressor; a reclaim vaporizer adapted to heat a refrigerant-lubricant mixture from the evaporator whereby the mixture is heated and lubricant and refrigerant are separated to provide reclaimed lubricant to the lubricant circuit and reclaimed refrigerant to the compressor circuit; and a control unit adapted to control flow of the mixture from the evaporator to the reclaim vaporizer based upon temperature of the mixture from the evaporator and temperature of reclaimed lubricant leaving the reclaim evaporator.
- a method for controlling reclaim of lubricant in a compressor system comprises the steps of operating a compressor circuit comprising a compressor, condenser and an evaporator and a lubricant circuit for circulating lubricant to the compressor so as to provide a refrigerant-lubricant mixture leaving the evaporator; exposing the mixture to heat in a reclaim vaporizer so as to provide reclaimed lubricant to the lubricant circuit and reclaimed refrigerant to the compressor circuit; and controlling flow rate of the mixture to the reclaim vaporizer based upon temperature of the mixture leaving the evaporator and temperature of the reclaimed lubricant leaving the reclaim vaporizer.
- Figure 1 schematically illustrates a system and method in accordance with the present invention.
- the invention relates to a system and method for controlled recovery of lubricant such as oil in a compressor system whereby resulting viscosity of the oil can be controlled and maintained.
- Figure 1 shows a system 10 in accordance with the present invention.
- This basic system is the subject of commonly owned U.S. Patent No. 6,672,102 to Huenniger et al . issued January 6, 2004. This patent is incorporated herein by reference.
- system 10 includes a compressor circuit including a compressor 12, a condenser 14 and an evaporator 16 which are connected by refrigerant lines 18, 20 for flow of refrigerant through these components as desired.
- a typical system includes a further flow line from condenser 14 through an expansion device (not shown) and to evaporator 16. These components and lines complete a typical compressor circuit .
- a lubricant circuit for conveying oil from an oil sump 22 through an oil pump 24 and to an oil inlet 26 of compressor 12.
- a filter 28 can be positioned along oil line 30, if desired.
- An oil drain 32 carries oil from compressor 12 back to oil sump 22.
- oil or other suitable lubricant is mixed with refrigerant discharged through, line 18 to condenser 14, the expansion device and evaporator 16. Separation and reclaim of the oil for further use within the system, while maintaining oil viscosity at desired values, is the focus of the present invention.
- the mixture within evaporator 16 is therefore metered or fed to a reclaim vaporizer 34, wherein the mixture is exposed to heat so as to separate the refrigerant from the lubricant.
- This heat boils the refrigerant off from the lubricant, and the refrigerant passes through vent lines 36 back to line 20 and to the suction inlet 38 of compressor 12. Due to the control of the present invention, remaining oil has at this point been sufficiently purged of refrigerant as to have a viscosity suitable to maintain sealing and lubrication of the compressor as desired.
- vent line 38 is also communicated with oil sump 22 for carrying any further boiled off refrigerant from this location back to suction inlet 38 as well.
- Oil separated within reclaim vaporizer 34 passes through an oil discharge line 40 and back to sump 22 for further circulation within the lubricant circuit.
- heat is preferably applied to the refrigerant-lubricant mixture within vaporizer 34 from hot gas from the discharge of compressor 12, which can be fed to vaporizer 34, for example through line 42 which advantageously is separated off of main line 18 upstream of condenser 14.
- This hot gas from compressor 12 will be at a temperature greater than the temperature of the mixture of refrigerant and lubricant within evaporator 16.
- the gas discharge from compressor 12 can advantageously be used to provide heat to the mixture, and the resulting cooled refrigerant is then passed through line 44 to evaporator 16 and back to suction inlet 38 of compressor 12.
- system in accordance with the present invention may further preferably include a supplemental heat source 46, which is schematically shown in the drawings, and which can be a heater device and/or a further flow of fluid from the system, either of which can be controlled to provide additional heat to vaporizer 34 as needed.
- a supplemental heat source 46 which is schematically shown in the drawings, and which can be a heater device and/or a further flow of fluid from the system, either of which can be controlled to provide additional heat to vaporizer 34 as needed.
- a control valve 48 is advantageously positioned along line 50 for carrying the mixture from evaporator 44 to reclaim vaporizer 34.
- This valve 48 is advantageously adapted to be controlled by a control unit 50 which includes sensors of the mixture temperature (T ref ) , for example within evaporator 44, and the temperature of reclaimed oil (T oi i) , for example within line 40 to sump 22.
- control unit 50 can advantageously be adapted to sense or otherwise determine these temperatures, and then operate control valve 48 so as to control flow rate of the mixture from evaporator 16 to reclaim vaporizer 34 and thereby control the temperature difference between T o ii and T re f.
- a pre-selected range of temperature difference can be entered into control unit 50 and control unit 50 can be adapted or otherwise programmed to control valve 48 so as to maintain the temperature difference within this pre-selected range.
- Control unit 50 can be any suitable processor unit programmed with proper command instructions as set forth above. Specifically, control unit 50 is preferably adapted to receive signals that are indicative of the temperatures T o n and T ref , and to utilize these signals to determine a proper operating position for valve 48.
- supplemental heater 46 is further advantageously controlled by control unit 50.
- control unit 50 receiving the sensed signal related to temperatures T o n and T re f/ and would be programmed under situations where the difference between these temperatures is insufficient and valve 48 cannot be further closed to operate supplemental heater 46 to apply further heat as desired.
- control unit 50 has been programmed to maintain a difference ( ⁇ T) between T O ii and T ref at between about a low value of X AND a high value of Y. Assume the temperature difference ⁇ T drops to a level which is less than X. At this point, control unit 50 would partially close valve 48 to slow the flow of mixture to reclaim vaporizer 34. This results in greater heating of the mixture and a higher T o n, which also leads to an increase in ⁇ T. [0035] Assume that ⁇ T now exceeds the value Y. At this point, control unit 50 will open valve 48 further to increase flow of mixture to reclaim vaporizer 34. In this way, flow rate to reclaim vaporizer 34 is optimized to maximize oil reclaim volume while maintaining the desired ⁇ T and, accordingly, a desired oil viscosity.
- valve 48 Assume next that after the first partial closing of valve 48, the ⁇ T value remains less than X. Valve 48 is therefore closed further by control unit 50 to attempt to raise ⁇ T to the desired value. Control unit 50 continues to close valve 48 until valve 48 reaches a maximum closed setting wherein a minimum flow is fed to reclaim vaporizer 34. If at this point, ⁇ T is still too low, supplemental heater 46 can be activated to provide more heat and raise ⁇ T to the desired range.
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/US2005/005092 WO2006088459A2 (en) | 2005-02-15 | 2005-02-15 | Compressor system with controlled lubricant reclaim |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1851491A2 true EP1851491A2 (en) | 2007-11-07 |
EP1851491A4 EP1851491A4 (en) | 2010-09-01 |
EP1851491B1 EP1851491B1 (en) | 2014-04-02 |
Family
ID=36916868
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05723228.2A Not-in-force EP1851491B1 (en) | 2005-02-15 | 2005-02-15 | Compressor system with controlled lubricant reclaim |
Country Status (6)
Country | Link |
---|---|
US (1) | US20080271477A1 (en) |
EP (1) | EP1851491B1 (en) |
CN (1) | CN100538216C (en) |
AU (1) | AU2005327580B2 (en) |
HK (1) | HK1120599A1 (en) |
WO (1) | WO2006088459A2 (en) |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008112568A2 (en) * | 2007-03-09 | 2008-09-18 | Johnson Controls Technology Company | Compressor with multiple inlets |
US20120137723A1 (en) * | 2009-05-11 | 2012-06-07 | Lg Electronics Inc. | Air conditioner |
US8623119B2 (en) * | 2009-10-15 | 2014-01-07 | Daryl W. Hanson | Compressor lubricant reclaiming process and system |
CN103047170B (en) * | 2011-10-17 | 2015-06-03 | 珠海格力电器股份有限公司 | Compressor oil supply system and compressor with same |
WO2014117005A1 (en) | 2013-01-25 | 2014-07-31 | Trane International Inc. | Refrigerant cooling and lubrication system |
TWI577949B (en) | 2013-02-21 | 2017-04-11 | 強生控制科技公司 | Lubrication and cooling system |
WO2014204745A1 (en) * | 2013-06-17 | 2014-12-24 | Carrier Corporation | Oil recovery for refrigeration system |
US20160265824A1 (en) * | 2013-11-08 | 2016-09-15 | Carrier Corporation | Fluid collection assembly |
CN204783653U (en) * | 2014-01-10 | 2015-11-18 | 阿特拉斯·科普柯空气动力股份有限公司 | Oil spout formula compressor |
US10527050B2 (en) * | 2014-03-18 | 2020-01-07 | Carrier Corporation | Refrigerant lube system |
CN104180142B (en) * | 2014-08-22 | 2017-02-01 | 珠海格力电器股份有限公司 | Lubricating oil supply device, centrifugal compressor and oil supply method |
JP6397372B2 (en) * | 2015-06-12 | 2018-09-26 | 荏原冷熱システム株式会社 | Compression refrigerator |
WO2017066575A1 (en) * | 2015-10-15 | 2017-04-20 | Carrier Corporation | Multi-stage oil batch boiling system |
US10935292B2 (en) | 2018-06-14 | 2021-03-02 | Trane International Inc. | Lubricant quality management for a compressor |
EP3745049B1 (en) | 2019-05-29 | 2024-02-07 | Carrier Corporation | Refrigeration apparatus |
US20210318042A1 (en) * | 2020-04-08 | 2021-10-14 | Carrier Corporation | Vapor compression system and method for vapor oil recovery |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6082982A (en) * | 1997-11-17 | 2000-07-04 | Uop Llc | Flooded compressor with improved oil reclamation |
US6672102B1 (en) * | 2002-11-27 | 2004-01-06 | Carrier Corporation | Oil recovery and lubrication system for screw compressor refrigeration machine |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4878355A (en) * | 1989-02-27 | 1989-11-07 | Honeywell Inc. | Method and apparatus for improving cooling of a compressor element in an air conditioning system |
US5016447A (en) * | 1990-05-02 | 1991-05-21 | Carrier Corporation | Oil return for a two-stage compressor having interstage cooling |
-
2005
- 2005-02-15 EP EP05723228.2A patent/EP1851491B1/en not_active Not-in-force
- 2005-02-15 CN CNB2005800483985A patent/CN100538216C/en not_active Expired - Fee Related
- 2005-02-15 AU AU2005327580A patent/AU2005327580B2/en not_active Ceased
- 2005-02-15 WO PCT/US2005/005092 patent/WO2006088459A2/en active Application Filing
- 2005-02-15 US US11/816,190 patent/US20080271477A1/en not_active Abandoned
-
2008
- 2008-11-06 HK HK08112194.1A patent/HK1120599A1/en not_active IP Right Cessation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6082982A (en) * | 1997-11-17 | 2000-07-04 | Uop Llc | Flooded compressor with improved oil reclamation |
US6672102B1 (en) * | 2002-11-27 | 2004-01-06 | Carrier Corporation | Oil recovery and lubrication system for screw compressor refrigeration machine |
Non-Patent Citations (1)
Title |
---|
See also references of WO2006088459A2 * |
Also Published As
Publication number | Publication date |
---|---|
EP1851491B1 (en) | 2014-04-02 |
AU2005327580A1 (en) | 2006-08-24 |
CN100538216C (en) | 2009-09-09 |
EP1851491A4 (en) | 2010-09-01 |
WO2006088459A3 (en) | 2008-01-03 |
WO2006088459A2 (en) | 2006-08-24 |
AU2005327580B2 (en) | 2010-10-21 |
HK1120599A1 (en) | 2009-04-03 |
CN101180507A (en) | 2008-05-14 |
US20080271477A1 (en) | 2008-11-06 |
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