GB2404602A - System of protecting compressor from water in lubricating oil - Google Patents

System of protecting compressor from water in lubricating oil Download PDF

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Publication number
GB2404602A
GB2404602A GB0318138A GB0318138A GB2404602A GB 2404602 A GB2404602 A GB 2404602A GB 0318138 A GB0318138 A GB 0318138A GB 0318138 A GB0318138 A GB 0318138A GB 2404602 A GB2404602 A GB 2404602A
Authority
GB
United Kingdom
Prior art keywords
reservoir
water
fluid
compressor
measuring
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.)
Withdrawn
Application number
GB0318138A
Other versions
GB0318138D0 (en
Inventor
Philip Nichol
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.)
Compair UK Ltd
Original Assignee
Compair UK Ltd
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 Compair UK Ltd filed Critical Compair UK Ltd
Priority to GB0318138A priority Critical patent/GB2404602A/en
Publication of GB0318138D0 publication Critical patent/GB0318138D0/en
Priority to PCT/GB2004/003306 priority patent/WO2005012728A1/en
Publication of GB2404602A publication Critical patent/GB2404602A/en
Withdrawn legal-status Critical Current

Links

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
    • 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
    • F04C29/026—Lubricant separation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
    • B01D17/02—Separation of non-miscible liquids
    • B01D17/0208—Separation of non-miscible liquids by sedimentation
    • B01D17/0214—Separation of non-miscible liquids by sedimentation with removal of one of the phases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
    • B01D17/12—Auxiliary equipment particularly adapted for use with liquid-separating apparatus, e.g. control circuits
    • 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
    • F04B39/16—Filtration; Moisture separation
    • 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
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
    • 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
    • F04C18/30—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C18/34—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members
    • F04C18/344—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • 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
    • F04C29/0092—Removing solid or liquid contaminants from the gas under pumping, e.g. by filtering or deposition; Purging; Scrubbing; Cleaning

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Compressor (AREA)

Abstract

There is disclosed a compressor arrangement 10 comprising a compressor 11 for compressing a gas, separating means 13 for separating oil from a compressed gas before its discharge from the compressor, a reservoir 14 for receiving the separated oil 16, means 19 for measuring a parameter of fluid resting at a lower end of the reservoir, means 21 for removing water collected in the lower end of the reservoir and control means 20 for activating the water removal means 21 when the measured parameter of the fluid differs from a predetermined value, and deactivating the water removal means when the measured parameter of the fluid substantially matches the predetermined value.

Description

- 1 -
2404602
COMPRESSOR ARRANGEMENTS
The invention relates to compressor arrangements, such as rotary screw and vane 5 compressors, used to compress a gas such as air and the protection of such compressors from water in the lubricating oil.
Many compressors require the use of oil during 10 their operation. The oil has three major functions within the scope of compressor arrangements; it cools the compressed gas, lubricates the bearings and seals the rotors in the air end (compression element). As a result the discharged compressed gas 15 contains a large quantity of oil that is separated and returned to the compressor. A pressure vessel is generally used to extract the bulk of the oil from the compressed gas during a primary separation process. This pressure vessel is also known as a 20 reclaimer and usually contains, or works in conjunction with, a filter or separator element to separate the oil from the compressed gas. The oil separated from the gas is then cooled and filtered and returned to the air-end. Oil collecting in the 25 separator element is drawn back to the air end through a restrictor and non-return valve.
A major problem with this type of arrangement is that the oil becomes contaminated with water. The 3 0 atmospheric air drawn into the compressor contains water vapour. Under unfavourable conditions such as humid climate or a compressor that runs at low temperatures the amount of water may be
- 2 -
considerable. As the oil mixes with the air, it picks up some water which then circulates with the oil causing damage to the bearings and corrosion to the compressor and associated vessels and pipework.
5 Normally the water is most noticeably deposited in the air/oil separator vessel.
Whilst the compressor is in operation it can be hard to detect the water, as it tends to be mixed thoroughly with the oil. Indeed some lubricants have a tendency to absorb water. When the machine is at rest, the water tends to separate from the oil and, because of its higher specific gravity, will sink to the bottom of the reservoir beneath the oil. The water should be drained regularly via a drainage valve in the bottom of the reservoir. Unfortunately in practice, this is not always carried out, and in many cases is not practical. Furthermore, when a compressor is stopped, the air inside the vessel cools which may result in further condensation of water.
It is an object of the present invention to overcome this disadvantage and to provide a 25 convenient means of detecting the presence of water in the oil reservoir and removing it without loss of oil.
According to the invention there is therefore 30 provided a compressor arrangement comprising a compressor for compressing a gas, separating means for separating oil from a compressed gas before its discharge from the compressor, a reservoir for
10
15
20
- 3 -
receiving the separated oil, electrical means for measuring a parameter of fluid resting at a lower end of the reservoir, means for removing water collected in the lower end of the reservoir and 5 control means for activating the water removal means when the measured parameter of the fluid changes in comparison to a predetermined value.
The invention will now be described, by way of
10 example only, with reference to the accompanying drawing Fig. 1 which is a schematic representation of a compressor arrangement according to the present invention.
15 The compressor arrangement 10 comprises a compressor 11 (air end) for compressing a gas such as air, a motor which drives the air end 11 and a pressure vessel (or reclaimer) 12. The pressure vessel 12 includes filtering means 13 for separating
2 0 oil from the compressed gas, and a reservoir 14 for collecting the separated oil 16. The pressure vessel 12 may be made from aluminium, iron, steel or any other suitable material.
25 Gas is taken into the air end 11 via a gas intake filter and compressed. During the compression process oil is mixed with the gas.
The discharged pressurised compressed gas from
3 0 the air end 11 contains a large quantity of oil,
typically 10 to 15 litres per minute for each cubic metre of free air compressed per minute. This oil has to be separated from the compressed gas before
- 4 -
it passes into use. The compressed gas and oil mixture is therefore discharged from the air end 11 to the pressure vessel 12 via an appropriate duct 15.
5
The separation of the gas and oil is typically achieved in two stages; primary separation of the oil and gas is carried out due to centrifugal forces as the mixture enters the pressure vessel 12 and 10 final separation is completed through a separator element 13 in the pressure vessel 12 or alternatively through a special filter fitted downstream of the pressure vessel.
15 The fully cleaned gas is subsequently passed through an after cooler before passing to the plant discharge and into use.
The reclaimed oil 16 is re-circulated from the 20 reservoir 14 via a return pipe 17 through a filter 23 and cooling means 24, back to the air end 11. Further oil which passes through the filter is scavenged back to the compressor by scavenge line 25.
25
Under conditions of high humidity and low compressor temperatures (below the pressure dewpoint), water 18 precipitates from the air during compression inside the air end 11 and is carried 30 with the oil into the pressure vessel 12. Whilst the reclaimed oil 16 is resting in the lower end of the reservoir 14, the water 18 separates from the oil 16 and, because of its higher specific gravity,
- 5 -
sinks to the bottom of the reservoir beneath the oil 16 .
A sensing device 19 is attached to the base of 5 the reservoir 14, which is connected to a controller 20. A duct 22 is also connected to the base of the reservoir 14 incorporating a valve 21, such as a solenoid valve. The controller 20 is also connected to the valve 21.
10
In one embodiment of the invention the sensing device 19 comprises a probe having two electrodes which protrude a short way into the fluid resting in the lower end of the reservoir 14. A low voltage 15 electrical supply is attached to the probe, such that when a low voltage is applied to the electrodes, the conductivity (or resistance) of the fluid in which the electrodes are immersed is measured. The measured conductivity is compared by 20 the controller against a known reference. If the measured value is higher than the reference value, it can be ascertained that the electrodes are immersed in water 18 rather than oil 16 , as the conductivity or water is significantly higher than 25 that of oil.
When the controller 20 determines that water 18 is present in the lower end of the reservoir 14, it opens the valve 21 to allow the water to drain out 3 0 via the duct 22. As the water 18 drains out, the measured conductivity of the fluid falls, and when the controller 20 determines that the measured value
- 6 -
of the fluid in the lower end of the reservoir 14 corresponds to that of oil, the valve 21 is closed.
In another embodiment of the invention, the 5 sensing device 19 comprises a sensor which measures the capacitance between two surfaces immersed in the fluid and compares the measured value to establish whether it differs from a predetermined reference value. Further embodiments may use an optical 10 sensor to measure and distinguish between the two fluids having a different refractive index.
In a further embodiment of the invention, the duct 22 and valve arrangement 21 are replaced by a 15 heating element located in the reservoir 14. When the controller 20 determines that water 18 is present in the bottom of the reservoir 14, the heating element is switched on, thereby causing the water 18 to evaporate.
20
The measurement should preferably be made when the user attempts to start th compressor 11 after it has been idle, to ensure that the oil and water have had time to separate.
25
- 7 -

Claims (12)

CLAIMS:
1. A compressor arrangement comprising a
5 compressor for compressing a gas, separating means for separating oil from a compressed gas before its discharge from the compressor, a reservoir for receiving the separated oil, means for measuring a parameter of fluid resting at a lower end of the 10 reservoir, means for removing water collected in the lower end of the reservoir and control means for activating the water removal means when the measured parameter of the fluid differs from a predetermined value, and deactivating the water removal means when 15 the measured parameter of the fluid substantially matches the predetermined value.
2. A compressor arrangement as claimed in claim 1 in which the measuring means comprise a pair of
20 surfaces located in the lower end of the reservoir and means for measuring the capacitance between the two surfaces.
3. A compressor arrangement as claimed in claim 1 25 in which the measuring means comprise a pair of electrodes projecting into the lower end of the reservoir and means for supplying a low voltage to the electrodes and measuring the conductivity of fluid in which the electrodes are immersed.
30
- 8 -
4. A compressor arrangement as claimed in Claim 1 in which the measuring means comprise an optical sensor which measures the refractive index of fluid in the lower end of the reservoir
5
5. A compressor arrangement as claimed in any one of the preceding claims in which the water removal means comprise a duct provided in the base of the reservoir and valve means, the operation of which is
10 controlled by the controller to allow water to be drained from the lower end of the reservoir.
6. A compressor arrangement as claimed in any one of claims 1 to 4 in which the water removal means
15 comprise a heating element, the operation of which is controlled by the controller to heat water in the lower end of the reservoir to cause its evaporation.
7. A method of removing water from lubricating oil
2 0 in compressors, comprising monitoring a parameter of fluid resting at a lower end of a reservoir which receives oil separated from a compressed gas before its discharged from the compressor, comparing the measured parameter against the predetermined value 25 and activating water removal means when the measured parameter of the fluid differs from said predetermined value.
8. A method as claimed in claim 7 in which the
3 0 capacitance between two surfaces located in a lower end of the reservoir is measured.
- 9 -
9. A method as claimed in claim 7 in which the conductivity of fluid in which a pair of electrodes are immersed is measured.
5
10. A method as claimed in any one of claims 7 to 9 in which water is removed by opening valve means to allow it to drain from the lower end of the reservoir.
10
11. A method as claimed in any one of claims 7 to.9 in which the water is removed by heating water in the lower end of the reservoir to cause its evaporation.
15
12. A method as substantially as hereinbefore described with reference to the accompanying drawings.
9. A method as claimed in claim 7 in which the conductivity of fluid in which a pair of electrodes are immersed is measured.
5 10. A method as claimed in any one of claims 7 to 9 in which water is removed by opening valve means to allow it to drain from the lower end of the reservoir.
10 11. A method as claimed in any one of claims 7 to 9 in which the water is removed by heating water in the lower end of the reservoir to cause its evaporation.
15 12. A method as substantially as hereinbefore described with reference to the accompanying drawings.
10
Amendments to the claims have been filed as follows :
CLAIMS:
1. A compressor arrangement comprising a
5 compressor for compressing a gas, separating means for separating oil from a compressed gas before its discharge from the compressor, a reservoir for receiving the separated oil, means for measuring a parameter of fluid resting at a lower end of the 10 reservoir, means for removing water collected in the lower end of the reservoir and control means for activating the water removal means when the measured parameter of the fluid differs from a predetermined value, and deactivating the water removal means when 15 the measured parameter of the fluid substantially matches the predetermined value.
2. A compressor arrangement as claimed in claim 1 in which the measuring means comprise a pair of
20 surfaces located in the lower end of the reservoir and means for measuring the capacitance between the two surfaces.
3. A compressor arrangement as claimed in claim 1 2 5 iri which the measuring means comprise a pair of electrodes projecting into the lower end of the reservoir and means for supplying a low voltage to the electrodes and measuring the conductivity of fluid in which the electrodes are immersed.
30
4. A compressor arrangement as claimed in claim 1 in which the measuring means comprise an optical sensor which measures the refractive index of fluid in the lower end of the reservoir.
5. A compressor arrangement as claimed in any one of the preceding claim in which the water removal means comprise a duct provided in the base of the reservoir and valve means, the operation of which is controlled by the controller to allow water to be drained from the lower end of the reservoir.
6. A compressor arrangement as claimed in any one of claims 1 to 4 in which the water removal means comprise a heating element, the operation of which is controlled by the controller to heat water in the lower end of the reservoir to cause its evaporation.
7. A method of removing water from lubricating oil in compressors, comprising measuring a parameter of fluid resting at a lower end of a reservoir which receives oil separated from a compressed gas before its discharge from the compressor, comparing the measured parameter against the predetermined value and activating water removal means when the measured parameter of the fluid differs from said predetermined value.
8. A method as claimed in claim 7 in which the capacitance between two surfaces located in a lower end of the reservoir is measured.
£
GB0318138A 2003-08-01 2003-08-01 System of protecting compressor from water in lubricating oil Withdrawn GB2404602A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB0318138A GB2404602A (en) 2003-08-01 2003-08-01 System of protecting compressor from water in lubricating oil
PCT/GB2004/003306 WO2005012728A1 (en) 2003-08-01 2004-07-30 System of protecting compressor from water in lubricating oil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0318138A GB2404602A (en) 2003-08-01 2003-08-01 System of protecting compressor from water in lubricating oil

Publications (2)

Publication Number Publication Date
GB0318138D0 GB0318138D0 (en) 2003-09-03
GB2404602A true GB2404602A (en) 2005-02-09

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB0318138A Withdrawn GB2404602A (en) 2003-08-01 2003-08-01 System of protecting compressor from water in lubricating oil

Country Status (2)

Country Link
GB (1) GB2404602A (en)
WO (1) WO2005012728A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101943163A (en) * 2010-09-10 2011-01-12 宁波鲍斯压缩机有限公司 Two-stage medium-pressure screw-type air compressor set
CN102410226A (en) * 2011-09-19 2012-04-11 王敬达 Operation method for drainage of mechanical pump and device thereof
WO2013057380A1 (en) * 2011-10-20 2013-04-25 Barba Willy Del Separator for water/oil condensates from compressors

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104214096B (en) * 2014-08-15 2017-04-12 珠海格力电器股份有限公司 Screw compressor and oil separation barrel part thereof
CN114669086B (en) * 2022-03-31 2023-02-24 珠海格力电器股份有限公司 Oil storage device with purification function and compressor system comprising same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB756156A (en) * 1953-05-13 1956-08-29 White S Marine Engineering Com Improvements in and relating to systems for separating liquids having different specific gravities
US5824228A (en) * 1994-03-16 1998-10-20 Rhone-Poulenc Chimie Method and device for removal, within a closed reactor, of the phase of the lowest density from a biphase system with presence of interface
JPH11343976A (en) * 1998-06-02 1999-12-14 Hitachi Ltd Oil separating system

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US3847810A (en) * 1973-05-04 1974-11-12 A Tulumello Apparatus for separating oil from water and measuring the amount of oil so separated
US4315822A (en) * 1981-01-26 1982-02-16 Nelson Industries, Inc. Process and apparatus for separating liquids
JPS57191491A (en) * 1981-05-22 1982-11-25 Hitachi Ltd Drain controlling apparatus in oil-cooled compressor
JPS58214841A (en) * 1982-06-09 1983-12-14 Hitachi Ltd Drain separator for oil-cooled compressor
JP3144425B2 (en) * 1990-06-19 2001-03-12 耕 南部 Engine key device
JP2530765B2 (en) * 1990-08-31 1996-09-04 株式会社神戸製鋼所 Operating method of oil-cooled compressor
JPH11210630A (en) * 1998-01-27 1999-08-03 Orion Mach Co Ltd Drain delivery device for compressed air generating device
JP2000018162A (en) * 1998-07-03 2000-01-18 Hitachi Ltd Oily water separator
DE19842484A1 (en) * 1998-09-16 1999-12-02 Siemens Ag Contents gauge for storage vessel, e.g. containing exhaust emission treatment solution used in heavy goods vehicle

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB756156A (en) * 1953-05-13 1956-08-29 White S Marine Engineering Com Improvements in and relating to systems for separating liquids having different specific gravities
US5824228A (en) * 1994-03-16 1998-10-20 Rhone-Poulenc Chimie Method and device for removal, within a closed reactor, of the phase of the lowest density from a biphase system with presence of interface
JPH11343976A (en) * 1998-06-02 1999-12-14 Hitachi Ltd Oil separating system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101943163A (en) * 2010-09-10 2011-01-12 宁波鲍斯压缩机有限公司 Two-stage medium-pressure screw-type air compressor set
CN101943163B (en) * 2010-09-10 2011-12-07 宁波鲍斯能源装备股份有限公司 Two-stage medium-pressure screw-type air compressor set
CN102410226A (en) * 2011-09-19 2012-04-11 王敬达 Operation method for drainage of mechanical pump and device thereof
CN102410226B (en) * 2011-09-19 2014-05-21 王敬达 Operation method for drainage of mechanical pump and device thereof
WO2013057380A1 (en) * 2011-10-20 2013-04-25 Barba Willy Del Separator for water/oil condensates from compressors

Also Published As

Publication number Publication date
GB0318138D0 (en) 2003-09-03
WO2005012728A1 (en) 2005-02-10

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