EP2808097B1 - Method for purging hardened grease or sludge from a bearing and bearing housing - Google Patents

Method for purging hardened grease or sludge from a bearing and bearing housing Download PDF

Info

Publication number: EP2808097B1
Authority: EP; European Patent Office
Prior art keywords: bearing; fluid; purging; flushing; purging fluid
Prior art date: 2013-05-27
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.): Active

Application number

EP13169384.8A

Other languages

German (de)

English (en)

French (fr)

Other versions

EP2808097A1 (en

Inventor

Jens Peter Høg Thomsen

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.)

Ocean Team Group AS

Original Assignee

Ocean Team Group AS

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.)

2013-05-27

Filing date

2013-05-27

Publication date

2019-04-24

2013-05-27 Application filed by Ocean Team Group AS filed Critical Ocean Team Group AS

2013-05-27 Priority to DK13169384.8T priority Critical patent/DK2808097T3/da

2013-05-27 Priority to ES13169384T priority patent/ES2735544T3/es

2013-05-27 Priority to EP13169384.8A priority patent/EP2808097B1/en

2014-05-19 Priority to PCT/DK2014/050138 priority patent/WO2014190995A1/en

2014-12-03 Publication of EP2808097A1 publication Critical patent/EP2808097A1/en

2019-04-24 Application granted granted Critical

2019-04-24 Publication of EP2808097B1 publication Critical patent/EP2808097B1/en

Status Active legal-status Critical Current

2033-05-27 Anticipated expiration legal-status Critical

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Classifications

- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto

Definitions

the present invention relates to a method as per the subject matter of claim 1 and a use as per the subject matter of claim 15 for purging hardened grease or sludge from a bearing and bearing housing of a wind turbine generator.
US5998352 discloses a heavy oil remover that comprises from about 0.1 to about 99 weight percent dipropylene glycol Mono N-butyl ether, from about 1 to about 99 percent of a mixture of methyl cocoate and methyl sunflowerate, from about 0.1 to about 75 weight percent napthenic petroleum distillate solvent, from about 0.1 to about 90 weight percent salt of an alkyl aromatic sulfonic acid, from about 0.05 to about 50 weight percent branched alcohol ethoxylate, from about 0.05 to about 50 weight percent ethoxylated alkyl mercaptan, and the balance, water.
WO13017854A1 discloses a method for in-situ cleaning of compressor blades in a gas turbine engine on an aircraft comprises washing said compressor blades by spraying a first liquid composition into the engine, the first liquid composition preferably comprising 50-90% water; and finally rinsing said washed compressor blades by spraying a second liquid composition into the engine, wherein the second liquid composition, has a freezing point of -10 degrees centigrade or below and is non-aqueous and hydrophilic.
DE102006036268A discloses a method involving bringing a chemical cleaning agent in contact with contaminated surfaces of engine parts e.g. oil pan, and/or in an engine oil chamber, where the cleaning agent has a composition of 15-30 percentage of Butyl-di-glycol and Glycol ether, 5-15 percentage of 2-Amino ethanol and fatty alcohol ethoxylate, 1-5 percentage of Limonene extract, and 5-15 percentage of nonionic Tenside. Oil deposits are dissolved and removed by rinsing off.
US6093689 discloses an asphalt and heavy oil degreaser comprises a cyclic hydrocarbon solvent, dipropylene glycol mono n-butyl ether, a salt of an alkyl aromatic sulfonic acid, a branched alcohol ethoxylate, and an ethoxylated alkyl mercaptan.
US6197734B discloses a high wax content heavy oil remover comprises dipropylene glycol mono n-butyl ether, ethoxylated alkyl mercaptan, salt of an alkyl aromatic sulfonic acid, branched alcohol ethoxylate, d-limonene, and white oil.
An apparatus for removing hardened sludge in a circulating system that is portable.
the system comprises an oil reservoir and a heater in order to heat the purging fluid to 130°F (54°C). While the heated purging fluid is pumped through the bearing, the bearing maybe rotated. During circulation of the purging fluid, large particles are strained in a strainer and fine particles are removed in a 10 micron filter.
purging fluid US2013/0068253 proposes grease or oils or other substances, especially if these cause the bearing or bearing housing to oxidize, such as fluids exhibiting caustic properties.
purging fluids without oxidizing properties are mentioned, such as acidic fluids.
caustic and acidic fluids are preferably not to be used for bearings in wind turbine generators, as there is a risk for damaging the surface of the bearings and, consequently, reducing the lifetime of the bearings.
the cleaning process of the bearings has been separated into multiple steps, where in a first step, purging fluid is circulated through the bearing in order to dissolve sludge, and in a second step, the bearing is flushed with a flushing fluid, where the flushing fluid flushes out remaining particles.
fluid is used for the liquids that are employed, because the liquids for purging and flushing will also contains particles during the cleaning process, why not the entire fluid is liquid.
the differentiation between the purging fluid and the flushing fluid implies that the liquids are different with respect to their composition.
the purging fluid contains a surfactant, whereas the flushing fluid does not.
the purging fluid has the task to dissolve sludge, and the flushing fluid has the task to flush out remaining particles, for example metal particles that are in the bearings due to wear in the bearings.
the purging fluid is not filtered by a fine particle filter, for example a 10 micron or 5 micron filter. Instead, once the purging fluid has dissolved the sludge and is removed from the bearing, a flushing fluid is pumped through the bearing, the flushing fluid being filtered for removing fine sized particles.
the flushing fluid is not subject to an increase in viscosity, because sludge is already dissolved and removed, the flow speed through the bearing of the flushing fluid can be adjusted easily and kept stable during circulation of the flushing fluid through the bearing. Especially, the flushing speed can be adjusted in relation to the viscosity of the flushing fluid such that a turbulent flow through the bearing can be maintained, which effectively removes particles from the bearing.
samples are taken from the flushing fluid in order to check whether the cleanliness of the bearing corresponds to predetermined parameters and criteria, for example the ISO4406 or ISO4407 criteria.
the measurement by sampling is an indirect method, because the flushing fluid is only reflecting the state inside the bearings if the flushing is efficient enough to actually flush out the particles that are in the bearing, for example metal particle from wearing of the bearing in the period before cleaning.
it would not be possible to check for such highly sensitive criteria by sampling the purging liquid because the dissolution of the sludge in the purging fluid would distort the picture of how the state of cleanliness is inside the bearing.
the flushing fluid is compatible with the new grease in the bearing after the cleaning such that no early degradation of the grease is provoked by remnants from the flushing fluid.
the flushing fluid based on synthetic oil is not optimum if the grease in the bearing is based on mineral oil, as there is a risk for incompatibility. For this reason, it is useful if there, as a step of the method, is performed a compatibility check that the flushing fluid is compatible with the final renewed grease for the bearing.
a surfactant is used without adding water.
a typical water content of a surfactant is at a level of a few percentages or even less than 1%, why the method comprises using a purging fluid with less than 10% of water, rather less than 5%, 3%, 2%, 1% or less than 0.5% of water.
the surfactant is used in a concentrated form.
the surfactant is diluted with a non-aqueous substance, for example oil, as already mentioned.
the bearing is flushed with a flushing liquid.
flushing liquid should be a non-aqueous substance, for example clean oil, such as hydraulic oil, in order to remove surfactants and remains.
a temperature of around 25°C, for example at 20-25°C is typically sufficient for an efficient removal of hardened grease, such that the system does not need a heating element but only uses the possible heat transfer from the bearings to the fluid.
the compactness is further achieved by providing a circuit with a pump for circulating the purging fluid but avoiding a tank within the circuit other than the volume of the bearings.
the bearings themselves function as the tank during circulation of the purging fluid and the final flushing fluid, for example oil, such as clean low-viscous 0.000015m 2 /s and 0.0001m 2 /s (15 to 100cST) hydraulic oil.
the bearing may be rotated during circulation of the purging fluid through the bearing.
the following method for purging hardened sludge from a bearing is used in connection with a bearing having a first connection for inlet of purging fluid and a second connection for outlet of cleaning liquid.
an apparatus is attached to the first connection and to the second connection, the apparatus comprises a pump for pumping purging fluid through the bearing, and by the apparatus a purging fluid is circulated through the first connection, through the bearing and through the second connection and back to the first connection in a plurality of circulation cycles. After the plurality of circulation cycles of the purging fluid, the purging fluid is pumped out of the bearing and out of the apparatus.
the apparatus circulates a flushing liquid through the bearing through the first connection, through the bearing and through the second connection and back to the first connection by a plurality of circulation cycles. After the plurality of circulation cycles of the flushing fluid, the flushing fluid is pumped out of the bearing and out of the apparatus, and new grease is provided into the bearing as a final step.
a particle filter is provided, the particle filter being configured for only letting particles pass if smaller than a predetermined particle size, for example a particle size of 10 micrometer or 5 micrometer, and filter the larger particles.
the method further comprises filtering the flushing fluid with the particle filter.
the particle filter is a mechanical filter with a pore size adapted for filtering the particles, for example with an average pore size of 10 micrometer or 5 micrometer.
the method advantageously comprises bypassing the particle filter with the purging fluid and only pumping the flushing fluid through the particle filter.
flushing fluid oil has been found advantageous, especially low-viscous 0.000015m 2 /s and 0.0001m 2 /s (15 to 100cST) hydraulic oil.
a different composition can be used as flushing fluid, however, advantageously, it contains more than 50% oil.
a useful viscosity of the flushing fluid is between 0.000015m 2 /s and 0.0001m 2 /s (15 to 100cST). As an example, this is useful when targeting a flushing rate of 5-20 l/min for a bearing having a diameter of 50-80 cm, which are typical dimensions for bearings in wind turbine generators.
flushing fluid should contain less than 10%, 5%, 3%, 2%, 1% or 0,5% of water.
the method comprises selecting a flushing fluid with a specific viscosity, for example 0.000015m 2 /s and 0.0001m 2 /s (15 to 100cST), and adjusting the pumping speed of the flushing fluid through the bearing at a pressure of less than 1 bar over ambient pressure to yield a Reynolds number for the flushing process through the bearing of between 500 and 3000.
a specific viscosity for example 0.000015m 2 /s and 0.0001m 2 /s (15 to 100cST)
the purging fluid contains more than 50%, 60%, or 70% surfactant and contains less than 10% of water.
the purging fluid contains less than 5%, 3%, 2%, 1% or 0.5% of water.
the water content is very low and, typically, only determined by the mninimum content of water as provided by commercially available surfactants.
surfactants typically, contain up to 0.5% water.
this very small amount of water is acceptable and less damaging than in prior art cases, where substantial amount of water is added.
the surfactant in the purging fluid shall be diluted
this can advantageously be done with oil, for example such that the oil content is at least 25%.
the cleaning of the bearing does not cause unnecessary damage of the bearing surface which would lead to a reduced lifetime of the bearing.
the influence of the oil also prevents damage by the small natural content of water in the commercially available surfactant product.
Such purging fluids and flushing fluids as well as the method and apparatus as described above and below are advantageously used for purging hardened sludge from a bearing, especially of a bearing of a wind turbine generator; however, the described fluids can also be used in other units, such as other type of bearings, tanks or pipes with hardened sludge wherein the purging fluid contains more than 50% surfactant and contains less than 10%, 5%, 3%, 2% or 1% or 0.5% water.
the fluids are repeatedly circulated through the bearing.
the apparatus in some embodiments is not provided with a specific heating unit.
the pump may slightly raise the temperature of the fluid, this heating is so small that the pump itself cannot be regarded as a heating unit.
the apparatus has no heating unit that is configured for specifically heating the purging fluid and/or the flushing fluid above 25°C.
the bearings would typically have a temperature of 40°C or higher, which is sufficient to heat the fluids even if the surroundings are much colder.
the apparatus comprises a pump with an inlet and an outlet for pumping liquid from the inlet to the outlet. It further comprises a first tube connection that is connected to the outlet of the pump and which has a first connecting part configured for connection to a connector of the bearing and a second tube connection that is connected to the inlet of the pump and which has a second connecting part for connecting to a second connector of the bearing.
the first tube connection and the second tube connection and the pump are configured together with the bearing, when connected, to function as a circuit for repeated circulation of purging fluid and repeated circulation of flushing fluid from the pump through the first tube connection, through the bearing and through the second tube connection back to the inlet of the pump.
the apparatus comprises a particle filter configured for only letting particles pass if smaller than a predetermined particle size, for example 10 or 5 micrometer.
the apparatus comprises a by-pass flow line that is by-passing the particle filter, and the apparatus comprises a valve system that can toggle between fluid flow through the filter and fluid flow bypassing the filter.
the apparatus is configured for, in a first step, circulating a purging fluid through the bearing while by-passing the filter and configured, in a subsequent step, circulating a flushing fluid through the bearing while filtering the flushing fluid by the filter. This two step cleaning process has been described above.
the apparatus comprises a safety valve provided in the first tube connection between the outlet of the pump and a connector of the bearing.
the safety valve is configured for discharging purging fluid or flushing fluid, respectively, from the apparatus in case that the pressure in the first tube connection is higher than a predetermined pressure level for thereby protecting the bearing from being exposed to overpressure.
overpressure is 0.2, 0.3, 0.5 or even 1 bar above atmospheric pressure. However, typically, it is less than 1 bar over atmospheric pressure.
the apparatus comprises a suction hose having first and second opposite ends, the first end being connected to the inlet of the pump and the second end being configured for selective switching between a connection to a first reservoir with purging fluid for receiving purging fluid by suction from the first reservoir and a second reservoir with flushing fluid for receiving flushing fluid by suction from the second reservoir.
the reservoirs are advantageously not part of the apparatus but are only provided for supply the fluids, if it is desired to have a compact apparatus. They may be cans that are part of the commercial product of the fluid.
the apparatus comprises a first valve between the inlet of the pump and the second end of the suction hose.
the circulation of purging fluid and circulation of flushing fluid in the circuit is thus performed, while the first valve is closed and the first and second reservoir are decoupled from the circuit.
the apparatus comprises a discharge tube with a first discharge tube end and a second discharge tube end, wherein the first discharge tube end is connected to the outlet of the pump and the second discharge tube end is configured for discharge of purging fluid or flushing fluid, respectively, from the apparatus.
a discharge valve may be provided between the second discharge tube end and the outlet of the pump for decoupling the discharge tube from the circuit when the purging fluid or flushing fluid, respectively, is circulating in the circuit.
Alcohol ethoxylates Useful products as purging fluid have been found among alcohol ethoxylates.
An example is an alcohol ethoxylate based on cetyl oleyl alcohol, for example with 2-6 moles of ethylene oxide.
alcohol ethoxylates based on C13 alcohols have been found useful as well.
the drawing is a principle sketch of an apparatus to execute the method as per the subject matter of claim 1. It shows an apparatus with a circulating system for purging fluid through a bearing 16.
the apparatus comprises a suction hose 3 for selective suction of purging fluid from a purging fluid tank 1 or flushing fluid from a flushing fluid tank 2.
the apparatus further comprises connection means 15 for connecting the apparatus to corresponding connectors at the bearing 16. Typically, such bearings have multiple connectors, which are also used in order to increase the flushing speed and increase turbulence for efficient flushing.
the apparatus also comprises a hose 24 for disposing purging fluid and flushing fluid to a waste tank 22.
Purging fluid from a purging fluid tank 1 is sucked by pump 6 via the suction hose 3 into the circuit of the apparatus, while ball valve 4 is open.
the pump 6 is driven by the electric motor 5. Pressure is measured by a pressure gauge 7.
the purging fluid is pumped to the three-way valve 8, where it by-passes the filter 9 through check valve 10 and is lead through check valve 11 into valve block 12.
Check valve 11 ensures that the fluid does not flow backwards into the filter 9.
the fluid is spilt up into several directions by the four flow control valves 26.
the fluid is released from the valve block 12 again through a pressure relief valve 25, from which the fluid flows back to the suction side of the pump 6 if the relief valve 25 gets activated.
the fluid is circulated a number of times. It is pointed out that the number of four valves 26 in the valve block 12 is not limiting but only an example.
the purging fluid is pumped from the valve block 12 through the flow control valves 26 to the unit 16 to be cleaned, such as a bearing 16 as illustrated in the figure.
the connectors 14, 15 between the bearing 16 and the apparatus comprise quick couplings. It is seen that the purging fluid for the bearing 16 is supplied as various connectors.
One return line 29 is connected via a quick coupling to the lower part of the bearing 16.
One fluid line 28 with connector 14, for example with a quick coupling, is peculiar in having an automatic air vent valve 13, which releases air if in the system, and which is mounted between the valve block 12 and the connector 14.
This line 28 should advantageously be at the highest point of the bearing 16.
a safety pressure check valve 23 is used as a safety function in order to prevent pressure in the circuit and bearing 16 above a predetermined value, which safeguards that no damage is done on the bearing 16 during flushing.
the arrangement with the air vent valve 13 and check valve 23 protects the sealing of the bearing 16 against overpressure that accidentally could move the sealing from its seat. In case of overpressure, fluid is guided out of the apparatus via hose 24 and to the waste tank 22.
the mix of purging fluid and aged grease is pumped out of the apparatus via hose 21 and into the waste tank 22 by opening the ball valve 20.
the fluid is released from the valve block 12 through a pressure relief valve 25, from which the fluid flows back to the suction side of the pump 6 if the relief valve 25 gets activated.
the fluid is circulated a number of times through the bearing 16. Once, the flushing fluid has flushed out contaminants from the bearing 16, the flushing fluid is pumped out with the pump 6 by open the ball valve 20 and via hose 21 into the waste tank 22.

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Engineering & Computer Science (AREA)
Mechanical Engineering (AREA)
Chemical & Material Sciences (AREA)
Chemical Kinetics & Catalysis (AREA)
General Chemical & Material Sciences (AREA)
Rolling Contact Bearings (AREA)
Sliding-Contact Bearings (AREA)
Wind Motors (AREA)

EP13169384.8A 2013-05-27 2013-05-27 Method for purging hardened grease or sludge from a bearing and bearing housing Active EP2808097B1 (en)

Priority Applications (4)

Application Number	Priority Date	Filing Date	Title
DK13169384.8T DK2808097T3 (da)	2013-05-27	2013-05-27	Fremgangsmåde til udrensning af hærdet fedt eller slam fra et leje og leje-hus
ES13169384T ES2735544T3 (es)	2013-05-27	2013-05-27	Procedimiento para la purga de grasa o lodo endurecido de un rodamiento y su carcasa
EP13169384.8A EP2808097B1 (en)	2013-05-27	2013-05-27	Method for purging hardened grease or sludge from a bearing and bearing housing
PCT/DK2014/050138 WO2014190995A1 (en)	2013-05-27	2014-05-19	Method and system for purging hardened grease from a bearing and bearing housing

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
EP13169384.8A EP2808097B1 (en)	2013-05-27	2013-05-27	Method for purging hardened grease or sludge from a bearing and bearing housing

Publications (2)

Publication Number	Publication Date
EP2808097A1 EP2808097A1 (en)	2014-12-03
EP2808097B1 true EP2808097B1 (en)	2019-04-24

Family

ID=48470844

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP13169384.8A Active EP2808097B1 (en)	2013-05-27	2013-05-27	Method for purging hardened grease or sludge from a bearing and bearing housing

Country Status (4)

Country	Link
EP (1)	EP2808097B1 (da)
DK (1)	DK2808097T3 (da)
ES (1)	ES2735544T3 (da)
WO (1)	WO2014190995A1 (da)

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GB201405841D0 (en) *	2014-04-01	2014-05-14	Romax Technology Ltd	Bearing Grease
DE102015016343A1 (de) *	2015-12-17	2017-06-22	Senvion Gmbh	Lagerschmierung
DE102016223937A1 (de) *	2016-12-01	2018-06-07	Zf Friedrichshafen Ag	Spülen und Testen eines Getriebes
JP7478625B2 (ja) *	2020-08-25	2024-05-07	株式会社荏原製作所	基板洗浄装置、基板処理装置、基板洗浄方法及びデバイスを製造する方法
EP4500026A1 (en) *	2022-03-24	2025-02-05	Energy Recovery, Inc.	Pressure exchanger flow adapter
CN115193803A (zh) *	2022-08-19	2022-10-18	内蒙古沃达新能源科技有限公司	一种智能轴承清洗一体机及其控制方法
CN115163576B (zh) *	2022-08-29	2025-02-11	贵州开阳化工有限公司	一种离心式压缩机轴瓦在线清洗装置及方法
CN116378915A (zh) *	2023-02-13	2023-07-04	国能思达科技有限公司	用于风机主轴承的润滑脂清洗及更换方法
CN117588373A (zh) *	2023-11-17	2024-02-23	国电联合动力技术有限公司	轴承润滑冲洗系统
CN120306346A (zh) *	2024-01-15	2025-07-15	大庆油田有限责任公司	一种直驱螺杆泵轴承箱在线清洗装置

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2013
- 2013-05-27 DK DK13169384.8T patent/DK2808097T3/da active
- 2013-05-27 EP EP13169384.8A patent/EP2808097B1/en active Active
- 2013-05-27 ES ES13169384T patent/ES2735544T3/es active Active
2014
- 2014-05-19 WO PCT/DK2014/050138 patent/WO2014190995A1/en not_active Ceased

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US6712080B1 (en) *	2002-02-15	2004-03-30	The United States Of America As Represented By The Secretary Of The Army	Flushing system for removing lubricant coking in gas turbine bearings

Also Published As

Publication number	Publication date
WO2014190995A1 (en)	2014-12-04
ES2735544T3 (es)	2019-12-19
DK2808097T3 (da)	2019-07-29
EP2808097A1 (en)	2014-12-03

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