US20160230762A1 - Method and apparatus for oil sensing in a compressor - Google Patents

Method and apparatus for oil sensing in a compressor Download PDF

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Publication number
US20160230762A1
US20160230762A1 US15/025,172 US201415025172A US2016230762A1 US 20160230762 A1 US20160230762 A1 US 20160230762A1 US 201415025172 A US201415025172 A US 201415025172A US 2016230762 A1 US2016230762 A1 US 2016230762A1
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United States
Prior art keywords
compressor
oil
temperature
moveable part
determined
Prior art date
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Abandoned
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US15/025,172
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English (en)
Inventor
Aurélien DOR
Francis Pirenne
Haibin ZHAO
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.)
Copeland Europe GmbH
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Emerson Climate Technologies GmbH
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Filing date
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Publication of US20160230762A1 publication Critical patent/US20160230762A1/en
Assigned to EMERSON CLIMATE TECHNOLOGIES GMBH reassignment EMERSON CLIMATE TECHNOLOGIES GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DOR, AURELIEN, PIRENNE, FRANCIS, Zhao, Haibin
Abandoned 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
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/28—Safety arrangements; Monitoring
    • 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
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/02—Lubrication
    • 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
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/02—Lubrication
    • F04B39/0207—Lubrication with lubrication control systems
    • 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
    • F04B49/06—Control using electricity
    • F04B49/065—Control using electricity and making use of computers
    • 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
    • F04B51/00—Testing machines, pumps, or pumping installations
    • 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/18—Lubricating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
    • F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
    • F04C18/0215—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/008—Hermetic pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/02—Lubrication; Lubricant separation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
    • F01M11/10—Indicating devices; Other safety devices
    • F01M11/12—Indicating devices; Other safety devices concerning lubricant level
    • 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
    • F04B2201/00—Pump parameters
    • F04B2201/04—Carter parameters
    • F04B2201/0402—Lubricating oil temperature
    • 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
    • F04B2201/00—Pump parameters
    • F04B2201/04—Carter parameters
    • F04B2201/0403—Carter housing temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/80—Other components
    • F04C2240/81—Sensor, e.g. electronic sensor for control or monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/19—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N2250/00—Measuring
    • F16N2250/08—Temperature

Definitions

  • the current invention relates in general to a method and an apparatus for oil sensing in a compressor.
  • U.S. Pat. No. 6,276,901 B1 describes a combination of a sight glass and an optical sensor in a housing of a hermetically sealed compressor to allow both visual inspection of the oil level as well as automatic sensing of the oil level.
  • a sight glass and an optical sensor in a housing of a hermetically sealed compressor to allow both visual inspection of the oil level as well as automatic sensing of the oil level.
  • only the level of the oil can be inspected using the proposed combination of the sight glass and the sensor.
  • Other problems, such as degradation of the quality of the oil or oil delivery problems can not be identified by these means.
  • Such compressors operate in different states, at different operating conditions and at different ambient conditions.
  • the different states could be realized, for example, by different speeds of the compressor.
  • the different operating conditions may be defined, for example, by different suction temperatures and/or suction pressures.
  • the compressors could be used, for example, at ambient conditions such as environmental temperatures of ⁇ 30° Celsius up to 60° Celsius. This has the consequence that at certain states under certain conditions some temperatures indicate an upcoming false operation of the compressor, while at the same state under other conditions the same temperature indicates a safe operation of the compressor.
  • a temperature of the oil inside the compressor is determined.
  • oil serves as a lubricant to reduce friction between the compressors moveable parts.
  • the oil may be used for heat transfer purposes.
  • the term oil refers to any mineral or organic oils with or without additives as well as to any synthetic liquids, i.e. to any kind of suitable means that can be used for lubrication and/or heat transfer.
  • the temperature of the oil inside the compressor could be determined based on a direct measurement or could be determined by deriving other indicators, which may be also designated as indirect measurement.
  • the direct measurement could be carried out by any suitable temperature sensor such as by thermocouples or thermistors.
  • the temperature of the oil could be derived, for example, based on temperatures measured in the neighborhood of the oil, for example by measuring the temperature of a wall or other parts of the oil sump or other oil reservoirs or pumps.
  • the temperature of the oil inside the compressor is determined in an area of the compressor where oil is collected.
  • this could be an oil sump in the compressor.
  • the temperature is determined in the lower part of that area where oil is collected.
  • this could be at the bottom of the oil sump, such that even if there is little oil left, the oil temperature will be measured and not the temperature of the surroundings.
  • At least a part of the moveable part is lubricated by oil.
  • the movement of a part related to the moveable part is lubricated by means of oil.
  • a part related to the moveable part may be, for example, an axis of a pivoting moveable part.
  • oil is used in accordance with the above explanations.
  • the oil used for lubrication is in direct liquid contact with the remaining oil inside the compressor which temperature is determined, for example the oil in the oil sump, such that the oil used for lubrication is the same oil as the remaining oil in the compressor.
  • the oil used for lubricating the moveable part or parts related to the moveable part may also only be in indirect connection with the remaining oil in the compressor, for example, the two oils may only be in contact via a heat exchanger. Thereby, the two oils may also be different oils.
  • One reason for the occurrence of the unsafe mode may be a lack of lubrication, regardless whether the lack of lubrication is caused by a loss of oil, a degrading quality of the oil which may be due to a high amount of refrigerant in the oil/refrigerant mixture and/or due to blocking in the oil flow, which causes an overheating of certain parts on the compressor.
  • Another reason for the occurrence of the unsafe mode could be liquid flood back into the compressor.
  • the safe mode and the unsafe mode are mentioned as mutual exclusive alternatives, such that it is sufficient, when only one of the two modes is derived.
  • both modes i.e. the safe mode and the unsafe mode may be derived.
  • additional modes may be derived based on the determination of the oil temperature, on the temperature at the moveable part and, if necessary, based on further indications.
  • the person skilled in the art knows several ways, how one or more modes may be derived based on the two temperatures and which modes in between the two mutual exclusive alternatives may be necessary.
  • a database may be used with ranges of the oil temperatures and related ranges of temperature at the moveable parts which define safe modes or unsafe modes or further modes.
  • an equation may be used to calculate based on the determined temperatures a safety value which indicates when compared to a safety value boundary whether the compressor operates in a safe or in an unsafe mode.
  • oil path along which the oil travels.
  • Such an oil path may be mainly inside the compressor. However, it is also possible that some parts of the oil path are outside the housing of the compressor.
  • the oil may travel along the oil path at least temporarily during operation of the compressor.
  • oil travels along an oil path to lubricate the moveable part or a part related to the moveable part.
  • the oil could be delivered by frictional forces from one area, for example the area where oil is collected, to at least one area that needs lubrication.
  • the oil may be delivered by other suitable means, such as, for example, by vacuum pumping, impeller pumping or centrifugal pumping.
  • the compressor used in connection with the present invention is a scroll compressor.
  • a scroll compressor two interleaving scrolls are responsible for taking in fluids, compressing the fluids and discharging the compressed fluids.
  • One of the interleaving scrolls may be fixed, while the other scroll orbits eccentrically inside the scroll that is fixed.
  • the orbiting scroll may orbit relative to a fixed bearing, for example a thrust plate. Both scrolls may be also co-rotating to achieve the relative motion.
  • scroll compressors are more reliable than conventional compressors, such as reciprocating or wobble-plate compressors.
  • the present invention may also be used in connection with other compressor technologies, such as screw compressors or piston compressors.
  • additional parameters or indicators could be used to derive the mode of the compressor.
  • a suction temperature, a discharge temperature, a suction pressure and/or a discharge pressure may be used. All of these parameters or indicators help to derive the mode of the compressor, since they will likely change correspondingly to the different compressor operation modes.
  • Information about the operation mode of the compressor is helpful to prevent that a lubrication problem is detected although the compressor runs in a safe mode. For example, in the time period immediately after starting the compressor, the two determined temperatures may not change at the same speed and may therefore cause an unsafe mode detection. The same may be the case, if there is a fast transition.
  • the compressor may be in a transient operation mode or in a stable operation mode.
  • a stable operation mode may be detected, if the change of the discharge temperature over time is below a certain threshold.
  • the oil detection may be active. If the change of the discharge temperature over time is above the threshold value or above a further threshold value, the compressor is considered to be in a transient mode and the oil detection may be not active.
  • the discharge temperature or the change of the discharge temperature over time could be determined based on direct measurement or based on indirect measurement.
  • the temperature at the moveable part is determined at a stationary part of the compressor being in contact with the moveable part.
  • the temperature can be measured at the thrust plate.
  • a surface of the thrust plate is in direct contact with a surface of the orbiting scroll, wherein the contact surfaces are preferably lubricated by oil.
  • the temperature of the moveable part itself may be determined by ease of contact-free measurement sensors or sensors built in the moveable part. Also other physical quantities may allow to infer the temperature of the moveable part itself or at least at the moveable part.
  • the mode of the compressor is not only derived based on the current temperatures of the oil and at the moving part.
  • at least one past temperature of the oil and/or at/of the moveable part is considered.
  • the temperature at the moveable part may be used to calculate a theoretical oil temperature.
  • the temperature difference between the measured oil temperature and the calculated theoretical oil temperature is integrated over time to indicate whether the compressor is in a safe or in an unsafe mode.
  • using past values to determine the unsafe mode can provide an indication of an upcoming problem much earlier and much more reliable.
  • the ambient condition of the compressors environment and/or the compressor condition are determined and used together with the determined oil temperature and the temperature at/of the moveable part to derive whether the compressor operates in a safe or unsafe mode.
  • the method further comprises the step of stopping the compressor, if it is derived that the compressor operates in an unsafe mode. This prevents that the compressor is damaged due to a lack of oil or due to deteriorating lubrication properties of the oil-refrigerant mixture.
  • the deriving whether the compressor operates in a safe mode or in an unsafe further comprises deriving a warning mode.
  • a warning mode can be an intermediary mode that signals an operator that something is wrong, without having to shut down the compressor.
  • the warning mode can be determined as a result of a minor deviation of the safety value over a certain period of time.
  • the method further comprises determining the vibration of the compressor and the step of deriving whether the compressor operates in a safe mode or in an unsafe mode is also based on an analysis of the determined vibration.
  • the vibration may serve as an additional parameter for the deriving whether the compressor operates in a safe mode or in an unsafe mode. Thereby, the accuracy of the deriving can be increased.
  • an apparatus comprises means for determining a temperature of an oil inside a compressor, means for determining a temperature at a moveable part of the compressor, and means for deriving whether the compressor operates in a safe mode or in an unsafe mode based on an analysis of the determined oil temperature and the determined temperature at the moveable part.
  • FIG. 2 is a magnified cross sectional view of an embodiment of second sensor means of the apparatus according to the invention as shown in FIG. 1 installed inside a compressor.
  • FIG. 1 shows a cross sectional view of a scroll compressor 1 which could be used in connection with the method according to the present invention and with the apparatus according to the present invention.
  • the compressor 1 comprises an area 2 where oil is collected, i.e. an oil sump.
  • the compressor 1 comprises a first means for determining 3 a temperature of the oil.
  • This first means for determining 3 provides an indication for the temperature of the oil.
  • the first means for determining 3 could be, for example, a temperature sensor.
  • the first means for determining 3 is installed on the very bottom of area 2 where oil is collected in the compressor 1 to ensure that the oil temperature is measured and not the temperature of the surrounding gas when the oil level is very low.
  • the first means for determining 3 may determine the temperature either via contact or contact-free.
  • the compressor in FIG. 1 comprises also a second means for determining 4 of a temperature at a moveable part of the compressor 1 .
  • the second means for determining 4 could also be a temperature sensor.
  • the second means for determining 4 could be placed at a moveable part or close to a moveable part of the compressor in order to be able to determine an indication of the temperature at or of the moveable part.
  • the moveable part is a orbiting scroll 13 and the second means for determining 4 is located in or at a stationary part of the compressor 1 , namely a thrust plate 6 .
  • an oil path through the compressor 1 can also be seen.
  • the oil path origins in the area 2 where oil is collected, i.e. oil sump, from where the oil is hoisted up into the upper part of the compressor 1 to lubricate a plurality of bearings along its flow back down to the area 2 .
  • the oil is pumped up by a centrifugal force through the inner hole of the crankshaft 9 , where it exits the crankshaft 9 though three openings a top shaft oil opening 8 , a main bearing oil opening 10 , and a lower bearing oil opening 15 to lubricate the bearings.
  • the compressor comprises also means for determining the discharge temperature 17 .
  • FIG. 2 is a magnified cross sectional view of the mounting location of the second means for determining 4 , as shown in FIG. 1 .
  • a hole is made into the material of the thrust plate 6 that accommodates the second means for determining 4 .
  • the hole extends almost to the surface of the thrust plate 6 that is in contact with the moveable part 5 .
  • the second means for determining 4 can be also attached to the stationary part 6 by other means, for example it may be glued or screwed to the stationary part 6 .
  • the second means for determining 4 may also be located in the orbiting scroll 13 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Rotary Pumps (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Compressor (AREA)
US15/025,172 2013-09-27 2014-09-26 Method and apparatus for oil sensing in a compressor Abandoned US20160230762A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP13186321.9 2013-09-27
EP13186321.9A EP2853742B1 (en) 2013-09-27 2013-09-27 Method and apparatus for oil sensing in a compressor
PCT/EP2014/070628 WO2015044351A1 (en) 2013-09-27 2014-09-26 Method and apparatus for oil sensing in a compressor

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US20160230762A1 true US20160230762A1 (en) 2016-08-11

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US15/025,172 Abandoned US20160230762A1 (en) 2013-09-27 2014-09-26 Method and apparatus for oil sensing in a compressor

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US (1) US20160230762A1 (zh)
EP (1) EP2853742B1 (zh)
CN (1) CN105723089B (zh)
ES (1) ES2581060T3 (zh)
WO (1) WO2015044351A1 (zh)

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US20230003212A1 (en) * 2019-11-26 2023-01-05 Knorr-Bremse Systeme For Schienenfahrzeuge Gmbh Compressor system for a rail vehicle, and method for controlling a cooling device of a compressor system

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US10641268B2 (en) 2015-08-11 2020-05-05 Emerson Climate Technologies, Inc. Multiple compressor configuration with oil-balancing system
CN109113952B (zh) * 2017-06-26 2020-12-25 比亚迪股份有限公司 电动油泵总成、转向系统和润滑系统
DE102020118740A1 (de) * 2020-07-15 2022-01-20 Bitzer Kühlmaschinenbau Gmbh Kältemittelverdichter

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US3232519A (en) * 1963-05-07 1966-02-01 Vilter Manufacturing Corp Compressor protection system
US6302654B1 (en) * 2000-02-29 2001-10-16 Copeland Corporation Compressor with control and protection system
US6406265B1 (en) * 2000-04-21 2002-06-18 Scroll Technologies Compressor diagnostic and recording system
US7682084B2 (en) * 2003-07-18 2010-03-23 Kobe Steel, Ltd. Bearing and screw compressor
US20050254977A1 (en) * 2004-05-13 2005-11-17 Matsushita Electric Industrial Co., Ltd. Hermetic compressor and refrigeration unit
US20100101247A1 (en) * 2007-05-09 2010-04-29 Alexander Lifson Adjustment of compressor operating limits
US20110041533A1 (en) * 2009-08-20 2011-02-24 Foye David M Screw compressor drive control
US20110070100A1 (en) * 2009-09-24 2011-03-24 Emerson Climate Technologies, Inc. Crankcase heater systems and methods for variable speed compressors
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Publication number Priority date Publication date Assignee Title
US20230003212A1 (en) * 2019-11-26 2023-01-05 Knorr-Bremse Systeme For Schienenfahrzeuge Gmbh Compressor system for a rail vehicle, and method for controlling a cooling device of a compressor system

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Publication number Publication date
CN105723089B (zh) 2018-01-30
CN105723089A (zh) 2016-06-29
WO2015044351A1 (en) 2015-04-02
ES2581060T3 (es) 2016-08-31
EP2853742A1 (en) 2015-04-01
EP2853742B1 (en) 2016-04-20

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