US20100054958A1 - Oil-free air compressor system with inlet throttle - Google Patents
Oil-free air compressor system with inlet throttle Download PDFInfo
- Publication number
- US20100054958A1 US20100054958A1 US12/439,981 US43998107A US2010054958A1 US 20100054958 A1 US20100054958 A1 US 20100054958A1 US 43998107 A US43998107 A US 43998107A US 2010054958 A1 US2010054958 A1 US 2010054958A1
- Authority
- US
- United States
- 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.)
- Abandoned
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
Images
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. Pat. Nos. 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.
- FIG. 1 is a perspective view of a compressor system according to the prior.
- FIG. 2 is a schematic of an oil-free compressor system according to the present disclosure.
- FIG. 3 is perspective view of an inlet throttle according to the present disclosure.
- FIG. 4 is another perspective view of an inlet throttle according to the present disclosure
- FIGS. 1 and 3 An oil-free or dry-running piston compressor is illustrated in the FIGS. 1 and 3 as a two-stage compressor unit 10 .
- a drive unit 12 is mounted to a crankshaft 13 A (shown in FIG. 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 14 b and 14 c, for example receiving air from air inlet 11 through filter 15 and conduit 21 .
- the second high-pressure stage is performed by piston cylinder 14 a.
- 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 14 b 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 14 a.
- the output of the second stage piston cylinder 14 a is connected via pipe 28 to an inlet of the after cooling stage 22 .
- the piston cylinders 14 a, 14 b and 14 c each include an inlet valve 30 and outlet valve 32 connected to compression chamber 34 .
- the valves 30 and 32 are shown as simple check valves in FIG. 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 14 b, c is shown at the end of its input or suction cycle and second stage 14 a 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 14 b, 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 FIGS. 3 and 4 .
- the throttle 40 may be a butterfly valve as shown in FIGS. 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 21 B. 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 14 b will not introduce any air into chamber 34 . Thus there will be no additional air compressed by the compression cycle of 14 b in chamber 34 . This effectively unloads the first stage.
- 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.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Compressor (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
Description
- 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. Pat. Nos. 6,776,587 and 6,973,868.
- It is well-known in the multistage air compressors to have unloading valves at the output of the inter-cooling stage as illustrated by U.S. Pat. No. 6,287,085 and at the output of the after cooling stage as illustrated in U.S. Pat. No. 4,819,123. The unloading valve connects the pressurized air in the system to atmosphere or vents the pressure to unload the compression stage. Unloading is required for starting torque which exceeds 100 ft-lbs for example. Depending on the type of drive, for example, pneumatic, hydraulic, electric or chain, the torque at which the unlading takes place will vary. The unloading reduces the load on the drive and reduces power consumption.
- 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 according to the present disclosure 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.
- Other objects, advantages and novel features of the present invention will become apparent from the following detailed description of the invention when considered in conjunction with the accompanying drawings.
-
FIG. 1 is a perspective view of a compressor system according to the prior. -
FIG. 2 is a schematic of an oil-free compressor system according to the present disclosure. -
FIG. 3 is perspective view of an inlet throttle according to the present disclosure. -
FIG. 4 is another perspective view of an inlet throttle according to the present disclosure - An oil-free or dry-running piston compressor is illustrated in the
FIGS. 1 and 3 as a two-stage compressor unit 10. Adrive unit 12 is mounted to a crankshaft 13A (shown inFIG. 2 ) incrankcase 13 and may be, for example, an electric motor. Thecrankshaft 13 includes at least onepiston cylinder 14 per stage. The first stage of compression includespiston cylinders air inlet 11 throughfilter 15 andconduit 21. The second high-pressure stage is performed by piston cylinder 14 a. Thecompressor unit 10 includes acooling system 16 having anoutput 17 of the compressed air. Acompressed air outlet 17 is generally connected via acheck valve 19 to a reservoir (not shown). - A
cooling system 16 for the two-stage compressor includes aninter-cooling stage 20 and an aftercooling stage 22. Theinter-cooling stage 20 has an inlet connected bypipe 24 from the outlet of firststage piston cylinder 14 b to theinter-cooling stage 20. The outlet ofinter-cooling stage 20 is connected viapipe 26 to the inlet of the second stage piston cylinder 14 a. The output of the second stage piston cylinder 14 a is connected viapipe 28 to an inlet of the aftercooling stage 22. - The
piston cylinders inlet valve 30 andoutlet valve 32 connected tocompression chamber 34. For illustrative purposes thevalves FIG. 2 . Thevalves controller 52 or may be pneumatically controlled by pilot signals from various pipe and passages in the compressor system. Thefirst stage 14 b, c is shown at the end of its input or suction cycle and second stage 14 a is shown at the end of its compression cycle. - There is a
feedback passage 36 between thechambers 34 and the connection to theair inlet valve 30 ofpistons stages 14 a and 14 b, c. - An
adjustable throttle 40 is connected between theair inlet 11 and theinlet valve 30 of thefirst stage 14 b, c. As shown inFIG. 2 , thethrottle 40 is inconduit 21 between the filter and theinlet valve 30 or specifically between thecrankcase 13 and theinlet valve 30 inFIGS. 3 and 4 . Thethrottle 40 may be a butterfly valve as shown inFIGS. 2 and 4 . Thethrottle 14 is pivotally mounted in the modifiedconduit 21′ as isactuator 42. Acontrol port 44 is connected to, not shown, thecontroller 52. The actuator may be pneumatic or electric. Theconduit 21′ is mounted to thecrankcase 13 atflange 21 A and to thefirst piston stage 14 b, c atflange 21B. Both of the pistons would include the throttle at its input. - The
throttle 40 is controlled by thecontroller 52 which also controls themotor 12. Thecontroller 52 controls the on/off cycling of themotor 12 based on sensed conditions throughsensor input 54. There may be one or more inputs connected to thecontroller 52 to different sensors throughout the system. As well-known in prior art, these may be pressure sensors to different ports of the system, it may be temperature sensors or other sensors used in the control of compressors. - When the
controller 40 is cycling themotor 12, the pressure build-up in the system acts as a load on the compressor and back ontomotor 12. If the system is charged, the restarting of the motor is against the pressure in the piston'scylinders 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 themotor 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, thecontroller 52 substantially closes the normallyopen throttle 40 to prevent the introduction of air frominlet 11 intochamber 34. The downward motion or the sucking or inlet cycle of 14 b will not introduce any air intochamber 34. Thus there will be no additional air compressed by the compression cycle of 14 b inchamber 34. This effectively unloads the first stage. - Although the maximum unloading occurs when the
throttle 40 is totally closed, a small crack or leak allowing some input fromair inlet 11 prevents overheating in thepiston chamber 34. This does not adversely affect the efficiency of the unloading. - Since the
compressor 10 is an oil-free compressor, there is no oil to be sucked intochamber 34 when thethrottle 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 theoutput 17 of the system. - Although the present invention has been described and illustrated in detail, it is to be clearly understood that the same is by way of illustration and example only, and is not to be taken by way of limitation. The present adjustable throttle may be used on an oil-free piston compressor with a single compression stage. The scope of the present invention is to be limited only by the terms of the appended claims.
Claims (11)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/439,981 US20100054958A1 (en) | 2006-09-05 | 2007-08-30 | Oil-free air compressor system with inlet throttle |
Applications Claiming Priority (3)
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 |
US12/439,981 US20100054958A1 (en) | 2006-09-05 | 2007-08-30 | Oil-free air compressor system with inlet throttle |
Publications (1)
Publication Number | Publication Date |
---|---|
US20100054958A1 true US20100054958A1 (en) | 2010-03-04 |
Family
ID=39157960
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/439,981 Abandoned US20100054958A1 (en) | 2006-09-05 | 2007-08-30 | Oil-free 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) |
Cited By (10)
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 |
US20130213059A1 (en) * | 2012-02-21 | 2013-08-22 | Wilfried-Henning Reese | Compression of a cryogenic medium |
USD742419S1 (en) * | 2014-09-15 | 2015-11-03 | Gary Armstrong | Centripetal air/oil separator for drysump systems |
CN106194651A (en) * | 2016-08-31 | 2016-12-07 | 瑞立集团瑞安汽车零部件有限公司 | A kind of main air compressor machine of electronic oil-free |
CN107110136A (en) * | 2014-09-19 | 2017-08-29 | 克诺尔轨道车辆***有限公司 | Include the multi-stage piston compressor of outside cooling air guide device |
US9856866B2 (en) | 2011-01-28 | 2018-01-02 | Wabtec Holding Corp. | Oil-free air compressor for rail vehicles |
WO2019099783A1 (en) * | 2017-11-17 | 2019-05-23 | Illinois Tool Works Inc. | Methods and systems for air compressor with electric inlet valve control |
US20190331103A1 (en) * | 2016-07-26 | 2019-10-31 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Gas leak determining method, and multi-stage compressor |
US11841718B1 (en) | 2022-07-08 | 2023-12-12 | Ingersoll-Rand Industrial U.S., Inc. | Pneumatic inlet/blowdown valve assembly |
EP4390128A1 (en) * | 2022-12-21 | 2024-06-26 | Voith Patent GmbH | Piston compressor having idle function |
Citations (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
US4068980A (en) * | 1976-10-01 | 1978-01-17 | Gardner-Denver Company | Compressor startup control |
US4171188A (en) * | 1976-08-03 | 1979-10-16 | Chicago Pneumatic Tool Company | Rotary air compressors with intake valve control and lubrication system |
US4326839A (en) * | 1979-12-06 | 1982-04-27 | Tecumseh Products Company | Cylinder unloading mechanism for refrigeration compressor |
US4549856A (en) * | 1983-04-08 | 1985-10-29 | Cash Engineering Co. Pty. Ltd. | Compressor control system |
US4815950A (en) * | 1986-09-01 | 1989-03-28 | Hitachi, Ltd. | Multi-stage compressor capacity control apparatus |
US4819123A (en) * | 1986-11-25 | 1989-04-04 | Nippon Air Brake Co., Ltd. | Compressed air supply system |
US4869878A (en) * | 1986-08-16 | 1989-09-26 | Apu North America, Inc. | Device for creation of an oxygen-free working atmosphere |
US4968218A (en) * | 1988-10-05 | 1990-11-06 | Oy Tampella Ab | Method of controlling the air output of 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 |
US5358387A (en) * | 1991-05-29 | 1994-10-25 | Hitachi Ltd. | Oil-free scroll compressor |
US5388968A (en) * | 1994-01-12 | 1995-02-14 | Ingersoll-Rand Company | Compressor inlet valve |
US6146100A (en) * | 1998-03-10 | 2000-11-14 | Atlas Copco Airpower, Naamloze Vennootschap | Compressor unit and control device used thereby |
US6227815B1 (en) * | 1999-06-30 | 2001-05-08 | Campbell Hausfeld/Scott Fetzer Company | Pressure control for a reciprocating compressor |
US6287085B1 (en) * | 2000-01-26 | 2001-09-11 | Westinghouse Air Brake Company | Rapid unloader retrofits |
US6558135B1 (en) * | 1999-02-09 | 2003-05-06 | Devilbiss Air Power Company | Two stage oil free air compressor |
US6561766B2 (en) * | 2000-10-31 | 2003-05-13 | Hitachi, Ltd. | Oil free screw compressor operating at variable speeds and control method therefor |
US6776587B2 (en) * | 1999-12-21 | 2004-08-17 | Knorr-Bremse Systeme für Schienenfahrzeuge GmbH | Dual-stage, plunger-type piston compressor with minimal vibration |
US20050254980A1 (en) * | 2002-08-13 | 2005-11-17 | Mats Hedman | Control method for controlling the gas flow in a compressor |
US6973868B2 (en) * | 2001-02-28 | 2005-12-13 | Knorr-Bremse Systeme für Schienenfahrzeuge GmbH | Dry-running piston compressor (crankshaft drive lubrication) |
US7086841B2 (en) * | 2003-04-22 | 2006-08-08 | R. Conrader Company | Air compressor with inlet control mechanism and automatic inlet control mechanism |
US20070144170A1 (en) * | 2005-12-22 | 2007-06-28 | Caterpillar Inc. | Compressor having integral EGR valve and mixer |
US8002527B2 (en) * | 2005-08-30 | 2011-08-23 | Dienes Werke Fur Maschinenteile Gmbh & Co. | Dry operating screw-type compressor with pneumatically controlled air relief valve |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2661893A (en) | 1950-08-10 | 1953-12-08 | Ingersoll Rand Co | Control device for fluid compressors |
ES2120076T3 (en) | 1993-11-08 | 1998-10-16 | Sig Schweiz Industrieges | CONTROL DEVICE FOR A FILLING DEGREE REGULATION PUMP. |
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 |
US6505613B1 (en) * | 2001-08-27 | 2003-01-14 | General Motors Corporation | Air assist fuel injection system with compressor intake throttle control |
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 |
-
2007
- 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 CA CA2662495A patent/CA2662495C/en not_active Expired - Fee Related
- 2007-08-30 EP EP07841639.3A patent/EP2059679B1/en active Active
- 2007-08-30 US US12/439,981 patent/US20100054958A1/en not_active Abandoned
Patent Citations (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
US4549856A (en) * | 1983-04-08 | 1985-10-29 | Cash Engineering Co. Pty. Ltd. | Compressor control system |
US4869878A (en) * | 1986-08-16 | 1989-09-26 | Apu North America, Inc. | Device for creation of an oxygen-free working atmosphere |
US4815950A (en) * | 1986-09-01 | 1989-03-28 | Hitachi, Ltd. | Multi-stage compressor capacity control apparatus |
US4819123A (en) * | 1986-11-25 | 1989-04-04 | Nippon Air Brake Co., Ltd. | Compressed air supply system |
US4968218A (en) * | 1988-10-05 | 1990-11-06 | Oy Tampella Ab | Method of controlling the air output of 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 |
US5358387A (en) * | 1991-05-29 | 1994-10-25 | Hitachi Ltd. | Oil-free scroll compressor |
US5388968A (en) * | 1994-01-12 | 1995-02-14 | Ingersoll-Rand Company | Compressor inlet valve |
US6146100A (en) * | 1998-03-10 | 2000-11-14 | Atlas Copco Airpower, Naamloze Vennootschap | Compressor unit and control device used thereby |
US6558135B1 (en) * | 1999-02-09 | 2003-05-06 | 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 |
US6776587B2 (en) * | 1999-12-21 | 2004-08-17 | Knorr-Bremse Systeme für Schienenfahrzeuge GmbH | Dual-stage, plunger-type piston compressor with minimal vibration |
US6287085B1 (en) * | 2000-01-26 | 2001-09-11 | Westinghouse Air Brake Company | Rapid unloader retrofits |
US6561766B2 (en) * | 2000-10-31 | 2003-05-13 | Hitachi, Ltd. | Oil free screw compressor operating at variable speeds and control method therefor |
US6973868B2 (en) * | 2001-02-28 | 2005-12-13 | Knorr-Bremse Systeme für Schienenfahrzeuge GmbH | Dry-running piston compressor (crankshaft drive lubrication) |
US20050254980A1 (en) * | 2002-08-13 | 2005-11-17 | Mats Hedman | Control method for controlling the gas flow in a compressor |
US7086841B2 (en) * | 2003-04-22 | 2006-08-08 | R. Conrader Company | Air compressor with inlet control mechanism and automatic inlet control mechanism |
US8002527B2 (en) * | 2005-08-30 | 2011-08-23 | Dienes Werke Fur Maschinenteile Gmbh & Co. | Dry operating screw-type compressor with pneumatically controlled air relief valve |
US20070144170A1 (en) * | 2005-12-22 | 2007-06-28 | Caterpillar Inc. | Compressor having integral EGR valve and mixer |
Non-Patent Citations (1)
Title |
---|
Author: Department of Veteran Affairs Title: Valve symbols Date Published (mm/yyyy): 09/2010 Date accessed (mm/dd/yyyy): 07/08/2017 Link:https://www.cfm.va.gov/til/sDetail/Div23HVACSteam/SD230511-17.pdf * |
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US11085430B2 (en) * | 2016-07-26 | 2021-08-10 | Kobe Steel, Ltd. | Gas leak determining method, and multi-stage compressor |
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Also Published As
Publication number | Publication date |
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WO2008030760A2 (en) | 2008-03-13 |
AU2007292454B2 (en) | 2013-07-18 |
CA2662495C (en) | 2015-12-01 |
AU2007292454A1 (en) | 2008-03-13 |
CA2662495A1 (en) | 2008-03-13 |
EP2059679A4 (en) | 2016-12-21 |
EP2059679A2 (en) | 2009-05-20 |
WO2008030760A3 (en) | 2008-10-02 |
EP2059679B1 (en) | 2020-11-04 |
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