EP2059679A2 - Oil-free air compressor system with inlet throttle - Google Patents
Oil-free air compressor system with inlet throttleInfo
- Publication number
- EP2059679A2 EP2059679A2 EP07841639A EP07841639A EP2059679A2 EP 2059679 A2 EP2059679 A2 EP 2059679A2 EP 07841639 A EP07841639 A EP 07841639A EP 07841639 A EP07841639 A EP 07841639A EP 2059679 A2 EP2059679 A2 EP 2059679A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- compressor
- throttle
- inlet
- piston
- stage
- 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
- 238000000034 method Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 description 12
- 230000006835 compression Effects 0.000 description 10
- 238000007906 compression Methods 0.000 description 10
- 239000003921 oil Substances 0.000 description 5
- 230000001351 cycling effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
Classifications
-
- 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
- F04B49/02—Stopping, starting, unloading or idling control
- F04B49/03—Stopping, starting, unloading or idling control by means of valves
-
- 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
- F04B25/00—Multi-stage pumps
-
- 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
-
- 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
- F04B53/10—Valves; Arrangement of valves
- F04B53/1037—Flap valves
Definitions
- the present disclosure relates generally to air compressors and more specifically to an oil-free air compressor having an inlet throttle.
- An air compressor for example, two-stage air compressors include a first low pressure compression stage connected through an inter-cooling stage to a high pressure compression stage whose output is provided through an after cooling stage to an air reservoir. Examples are shown by U.S. Patents 6,776,587 and 6,973,868.
- Screw compressors have been unloaded by providing a throttle or butterfly valve at the air inlet to the compressor.
- the butterfly valve is normally open during operation of the compressor. To unload the compressor, the butterfly valve is closed. Thus no air is being provided to be compressed and therefore the compressor is unloaded.
- Screw compressor also includes an air oil filter at its output to remove the lubricating oil inherent in the system.
- Piston air compressors which include lubrication of the pistons have not used an adjustable throttle valve at the input. This is because the vacuum created in the compression cylinder when the throttle valve is closed will suck or draw the oil past the piston sealing rings. This area around the sealing rings is the only inlet to the compression cylinder during the intake or sucking cycle. This action creates undesirable and excessive oil consumption.
- An oil-free air compressor includes an air inlet and a compressed air outlet; and at least one piston stage connected to the air inlet by an inlet valve and the compressed air outlet by an outlet valve.
- a motor drives the piston stage; and an adjustable throttle is connected between the air inlet and the inlet valve.
- a controller controls the motor and the throttle to close the throttle to unload the piston stage when necessary.
- the compressor includes crankcase to which piston stage and the air inlet are mounted; and the throttle is mounted in a conduit connecting the crankcase to inlet valve.
- the throttle may be a butterfly valve.
- the compressor may have two piston stages; and the throttle is between the air inlet and the inlet valve of the first piston stage.
- the controller substantially closes the throttle to unload the piston stage for a pre-selected state of the compressor.
- a method of operating the oil-free air compressor includes determining the state of the compressor; and substantially closing the throttle to unload the piston stage for a pre-selected state of the compressor.
- the pre-selected state is the restart of the motor after a brief delay.
- Figure 1 is a perspective view of a compressor system according to the prior.
- Figure 2 is a schematic of an oil-free compressor system according to the present disclosure.
- Figure 3 is perspective view of an inlet throttle according to the present disclosure.
- Figure 4 is another perspective view of an inlet throttle according to the present disclosure
- FIG. 1 An oil-free or dry-running piston compressor is illustrated in the Figures 1 and 3 as a two-stage compressor unit 10.
- a drive unit 12 is mounted to a crankshaft 13A (shown in Figure 2) in crankcase 13 and may be, for example, an electric motor.
- the crankshaft 13 includes at least one piston cylinder 14 per stage.
- the first stage of compression includes piston cylinders 14b and 14c, for example receiving air from air inlet 11 through filter 15 and conduit 21.
- the second high-pressure stage is performed by piston cylinder 14a.
- the compressor unit 10 includes a cooling system 16 having an output 17 of the compressed air.
- a compressed air outlet 17 is generally connected via a check valve 19 to a reservoir (not shown).
- a cooling system 16 for the two-stage compressor includes an inter-cooling stage 20 and an after cooling stage 22.
- the inter-cooling stage 20 has an inlet connected by pipe 24 from the outlet of first stage piston cylinder 14b to the inter-cooling stage 20.
- the outlet of inter-cooling stage 20 is connected via pipe 26 to the inlet of the second stage piston cylinder 14a.
- the output of the second stage piston cylinder 14a is connected via pipe 28 to an inlet of the after cooling stage 22.
- the piston cylinders 14a, 14b and 14c each include an inlet valve 30 and outlet valve
- valves 30 and 32 connected to compression chamber 34.
- the valves 30 and 32 are shown as simple check valves in Figure 2.
- the valves 30 and 32 may be pneumatically or electrically controlled by controller 52 or may be pneumatically controlled by pilot signals from various pipe and passages in the compressor system.
- the first stage 14b, c is shown at the end of its input or suction cycle and second stage 14a is shown at the end of its compression cycle.
- An adjustable throttle 40 is connected between the air inlet 11 and the inlet valve 30 of the first stage 14b, c.
- the throttle 40 is in conduit 21 between the filter and the inlet valve 30 or specifically between the crankcase 13 and the inlet valve 30 in Figures 3 and 4.
- the throttle 40 may be a butterfly valve as shown in Figures 2 and 4.
- the throttle 14 is pivotally mounted in the modified conduit 21' as is actuator 42.
- a control port 44 is connected to, not shown, the controller 52.
- the actuator may be pneumatic or electric.
- the conduit 21 ' is mounted to the crankcase 13 at flange 21 A and to the first piston stage 14 b, c at flange 2 IB. Both of the pistons would include the throttle at its input.
- the throttle 40 is controlled by the controller 52 which also controls the motor 12.
- the controller 52 controls the on/off cycling of the motor 12 based on sensed conditions through sensor input 54.
- the controller 40 When the controller 40 is cycling the motor 12, the pressure build-up in the system acts as a load on the compressor and back onto motor 12. If the system is charged, the restarting of the motor is against the pressure in the piston's cylinders 34, as well as the various pipes and passages. It is well-known in the prior art, the pressurized system is unloaded to allow easy restarting of the motor 12. This is generally after a brief period of shut-down when the system has maintained the pressure. In the present compressor system when unloading is required, the controller 52 substantially closes the normally open throttle 40 to prevent the introduction of air from inlet 11 into chamber 34. The downward motion or the sucking or inlet cycle of 14b will not introduce any air into chamber 34.
- the compressor 10 is an oil-free compressor, there is no oil to be sucked into chamber 34 when the throttle 40 is substantially closed and a partial vacuum is created. Thus the compressor passages stay clean and there is no air/oil separator needed at the output 17 of the system.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US82451606P | 2006-09-05 | 2006-09-05 | |
PCT/US2007/077274 WO2008030760A2 (en) | 2006-09-05 | 2007-08-30 | Oil-free air compressor system with inlet throttle |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2059679A2 true EP2059679A2 (en) | 2009-05-20 |
EP2059679A4 EP2059679A4 (en) | 2016-12-21 |
EP2059679B1 EP2059679B1 (en) | 2020-11-04 |
Family
ID=39157960
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07841639.3A Active EP2059679B1 (en) | 2006-09-05 | 2007-08-30 | Oil-free reciprocating piston air compressor system with inlet throttle |
Country Status (5)
Country | Link |
---|---|
US (1) | US20100054958A1 (en) |
EP (1) | EP2059679B1 (en) |
AU (1) | AU2007292454B2 (en) |
CA (1) | CA2662495C (en) |
WO (1) | WO2008030760A2 (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2471983C2 (en) * | 2010-06-15 | 2013-01-10 | Федеральное государственное образовательное учреждение высшего профессионального образования Астраханский государственный технический университет (ФГОУ ВПО АГТУ) | Device to measure pressure of drilling mud in well |
US9856866B2 (en) | 2011-01-28 | 2018-01-02 | Wabtec Holding Corp. | Oil-free air compressor for rail vehicles |
DE102012003446A1 (en) * | 2012-02-21 | 2013-08-22 | Linde Aktiengesellschaft | Compacting a cryogenic medium |
USD742419S1 (en) * | 2014-09-15 | 2015-11-03 | Gary Armstrong | Centripetal air/oil separator for drysump systems |
DE102014113598A1 (en) * | 2014-09-19 | 2016-03-24 | Knorr-Bremse Systeme für Schienenfahrzeuge GmbH | Multi-stage piston compressor with an external cooling air duct |
JP6698461B2 (en) * | 2016-07-26 | 2020-05-27 | 株式会社神戸製鋼所 | Gas leak determination method and multi-stage compressor |
CN106194651B (en) * | 2016-08-31 | 2019-07-05 | 瑞立集团瑞安汽车零部件有限公司 | A kind of electronic oil-free main air compressor machine |
US20190154029A1 (en) * | 2017-11-17 | 2019-05-23 | Illinois Tool Works Inc. | Methods and systems for air compressor with electric inlet valve control |
US11841718B1 (en) | 2022-07-08 | 2023-12-12 | Ingersoll-Rand Industrial U.S., Inc. | Pneumatic inlet/blowdown valve assembly |
Family Cites Families (30)
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---|---|---|---|---|
US2661893A (en) * | 1950-08-10 | 1953-12-08 | Ingersoll Rand Co | Control device for fluid compressors |
US3367562A (en) * | 1966-06-23 | 1968-02-06 | Atlas Copco Ab | Means for unloading and controlling compressor units |
US3860363A (en) * | 1973-05-10 | 1975-01-14 | Chicago Pneumatic Tool Co | Rotary compressor having improved control system |
US4171188A (en) * | 1976-08-03 | 1979-10-16 | Chicago Pneumatic Tool Company | Rotary air compressors with intake valve control and lubrication system |
US4068980A (en) * | 1976-10-01 | 1978-01-17 | Gardner-Denver Company | Compressor startup control |
US4326839A (en) * | 1979-12-06 | 1982-04-27 | Tecumseh Products Company | Cylinder unloading mechanism for refrigeration compressor |
ATE35442T1 (en) * | 1983-04-08 | 1988-07-15 | Cash Eng Co Pty Ltd | COMPRESSOR CONTROL SYSTEM. |
DE3627763A1 (en) * | 1986-08-16 | 1988-02-18 | Alban Puetz | AGGREGATE FOR CREATING AN OXYGEN-FREE WORKING ATMOSPHERE |
JPH0739828B2 (en) * | 1986-09-01 | 1995-05-01 | 株式会社日立製作所 | Capacity control device for multi-stage compressor |
JPS63134360A (en) * | 1986-11-25 | 1988-06-06 | Nippon Air Brake Co Ltd | Air source device |
FI83808C (en) * | 1988-10-05 | 1991-08-26 | Tampella Oy Ab | Method for controlling air production in a screw compressor |
US4976588A (en) * | 1989-05-15 | 1990-12-11 | Elliott Turbomachinery Co., Inc. | Compressor control system to improve turndown and reduce incidents of surging |
US5009576A (en) * | 1990-01-08 | 1991-04-23 | Ingersoll-Rand Company | Compressor unloader controller |
JP2966575B2 (en) * | 1991-05-29 | 1999-10-25 | 株式会社日立製作所 | Oil-free scroll compressor |
JP3747061B2 (en) * | 1993-11-08 | 2006-02-22 | ツェーエルテー・コモン・レイル・テクノロジーズ・アクチェンゲゼルシャフト | Control device for injection ratio adjusting pump |
US5388968A (en) * | 1994-01-12 | 1995-02-14 | Ingersoll-Rand Company | Compressor inlet valve |
US5540558A (en) * | 1995-08-07 | 1996-07-30 | Ingersoll-Rand Company | Apparatus and method for electronically controlling inlet flow and preventing backflow in a compressor |
BE1011782A3 (en) * | 1998-03-10 | 2000-01-11 | Atlas Copco Airpower Nv | Compressor unit and taking control device used. |
US6183211B1 (en) * | 1999-02-09 | 2001-02-06 | Devilbiss Air Power Company | Two stage oil free air compressor |
US6227815B1 (en) * | 1999-06-30 | 2001-05-08 | Campbell Hausfeld/Scott Fetzer Company | Pressure control for a reciprocating compressor |
DE19961646C1 (en) * | 1999-12-21 | 2001-11-15 | Knorr Bremse Systeme | Low-vibration, two-stage plunger compressor |
US6287085B1 (en) | 2000-01-26 | 2001-09-11 | Westinghouse Air Brake Company | Rapid unloader retrofits |
JP3817420B2 (en) * | 2000-10-31 | 2006-09-06 | 株式会社日立産機システム | Variable rotational speed oil-free screw compressor and operation control method thereof |
DE10109514C1 (en) * | 2001-02-28 | 2002-07-11 | Knorr Bremse Systeme | Dry-running piston compressor, for rail vehicles, has lubricating nipples for external lubrication of the big end and/or gudgeon pin bearings to give long intervals between overhauls |
US6505613B1 (en) | 2001-08-27 | 2003-01-14 | General Motors Corporation | Air assist fuel injection system with compressor intake throttle control |
SE0202403L (en) * | 2002-08-13 | 2004-02-14 | Cargine Engineering Ab | Control time for regulating the gas flow at a compressor |
CA2522762C (en) * | 2003-04-22 | 2010-01-26 | R. Conrader Company | Air compressor with inlet control mechanism and automatic inlet control mechanism |
DE102004048940A1 (en) * | 2004-10-07 | 2006-04-13 | TEKO Gesellschaft für Kältetechnik mbH | Method for controlling the operation of a chiller system has the suction chamber of the piston type compressor periodically isolated by a pulse width modulated control signal |
DE102005040921B4 (en) * | 2005-08-30 | 2008-10-23 | Dienes Werke für Maschinenteile GmbH & Co KG | Dry running screw compressor with pneumatically controlled vent valve |
US20070144170A1 (en) * | 2005-12-22 | 2007-06-28 | Caterpillar Inc. | Compressor having integral EGR valve and mixer |
-
2007
- 2007-08-30 CA CA2662495A patent/CA2662495C/en not_active Expired - Fee Related
- 2007-08-30 WO PCT/US2007/077274 patent/WO2008030760A2/en active Application Filing
- 2007-08-30 AU AU2007292454A patent/AU2007292454B2/en not_active Ceased
- 2007-08-30 EP EP07841639.3A patent/EP2059679B1/en active Active
- 2007-08-30 US US12/439,981 patent/US20100054958A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
"Oil-Free compressor design is easy to extend", ENGINEERING, 16 May 2000 (2000-05-16), pages 1, XP003025500 |
Also Published As
Publication number | Publication date |
---|---|
WO2008030760A3 (en) | 2008-10-02 |
AU2007292454B2 (en) | 2013-07-18 |
CA2662495A1 (en) | 2008-03-13 |
WO2008030760A2 (en) | 2008-03-13 |
CA2662495C (en) | 2015-12-01 |
EP2059679B1 (en) | 2020-11-04 |
EP2059679A4 (en) | 2016-12-21 |
AU2007292454A1 (en) | 2008-03-13 |
US20100054958A1 (en) | 2010-03-04 |
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