EP2059679B1 - Ölfreies luft-hubkolbenkompressorsystem mit einlassdrossel - Google Patents

Ölfreies luft-hubkolbenkompressorsystem mit einlassdrossel Download PDF

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Publication number
EP2059679B1
EP2059679B1 EP07841639.3A EP07841639A EP2059679B1 EP 2059679 B1 EP2059679 B1 EP 2059679B1 EP 07841639 A EP07841639 A EP 07841639A EP 2059679 B1 EP2059679 B1 EP 2059679B1
Authority
EP
European Patent Office
Prior art keywords
throttle
compressor
piston
stage
inlet
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.)
Not-in-force
Application number
EP07841639.3A
Other languages
English (en)
French (fr)
Other versions
EP2059679A4 (de
EP2059679A2 (de
Inventor
Michael Hartl
William B. Mccurdy
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.)
New York Air Brake LLC
Original Assignee
New York Air Brake LLC
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 New York Air Brake LLC filed Critical New York Air Brake LLC
Publication of EP2059679A2 publication Critical patent/EP2059679A2/de
Publication of EP2059679A4 publication Critical patent/EP2059679A4/de
Application granted granted Critical
Publication of EP2059679B1 publication Critical patent/EP2059679B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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 reciprocating piston 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 as disclosed in US 4,549,856 A , 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.
  • U.S. Patent 2,661,893 discloses a compressor with a throttle being used as a speed regulator acting in response to variations in the discharge pressure to change the speed of the motor.
  • U.S. Patent 5,540,558 discloses a compressor with a compressor stage and a throttle at the air inlet to the compressor.
  • U.S. Patent 5,701,873 discloses a compressor with a compressor stage and an adjustable throttle which serves to adjust a flow through quantity of Diesel oil.
  • U.S. Patent 6,505,613 discloses an air compressor with a compressor stage and a throttle being controlled by a electrical control unit, where the control unit energizes an actuator to partially close the throttle to restrict air flow through the inlet as the amount of air used by injectors varies with engine speed.
  • An oil-free reciprocating piston air compressor system with an inlet throttle is known from BOGE Kompressoren.
  • An oil-free reciprocating piston 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 for a restart of the motor after a brief delay.
  • 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.
  • 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, 14h and 14c 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 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. Then 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 21A and to the first piston stage 14b, c at flange21B. 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/of 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 chamber34. Thus there will be no additional air compressed by the compression cycle of 14b in chamber 34. This effectively unloads the first stage.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Claims (8)

  1. Ölfreier Hubkolben-Luftkompressor (10), umfassend:
    einen Lufteinlass (11) und einen Druckluftauslass (17);
    mindestens eine Kolbenstufe (14a, b, c), die über ein Einlassventil (30) mit dem Lufteinlass (11) und über ein Auslassventil (32) mit dem Druckluftauslass (17) verbunden ist;
    einen Motor (12), der die Kolbenstufe (14a, b, c) antreibt;
    eine einstellbare Drosselklappe (40), die zwischen dem Lufteinlass (11) und dem Einlassventil (30) angeschlossen ist,
    dadurch gekennzeichnet, dass
    der Kompressor (10) ferner einen Controller (52) umfasst, der den Motor und die Drosselklappe steuert, wobei der Controller das Ein-/Ausschalten des Motors (12) auf der Grundlage von erfassten Bedingungen durch einen Sensoreingang steuert; wobei der Controller (52) so konfiguriert ist, dass er die Drosselklappe (40) im Wesentlichen schließt, um die Kolbenstufe (14a, b, c) für einen Neustart des Motors (12) zu entlasten.
  2. Kompressor nach Anspruch 1, bei dem die Drosselklappe (40) ein Schmetterlingsventil ist.
  3. Kompressor nach Anspruch 1, wobei der Kompressor (10) zwei Kolbenstufen (14a, b, c) aufweist und die Drosselklappe (40) sich zwischen dem Lufteinlass (11) und dem Einlassventil (30) der ersten Kolbenstufe (14b, c) befindet.
  4. Kompressor nach Anspruch 1, wobei der Kompressor (10) ein Kurbelgehäuse (13) aufweist, an dem die Kolbenstufe (14a, b, c) und der Lufteinlass (11) montiert sind, und die Drosselklappe (40) in einer Leitung (21) montiert ist, die das Kurbelgehäuse (13) mit dem Einlassventil (30) verbindet.
  5. Kompressor nach Anspruch 1, wobei die Kolbenstufe (14a, b, c) zwei parallel geschaltete Kolben umfasst und jeder Kolben eine einstellbare Drosselklappe (40) aufweist, die mit dem Einlassventil (30) verbunden ist.
  6. Ölfreier Luftkompressor nach einem der vorhergehenden Ansprüche, wobei der Lufteinlass (11) mit einem Kurbelgehäuse (13) verbunden ist und wobei die mindestens eine Kolbenstufe (14a, b, c) an dem Kurbelgehäuse (13) montiert ist, das Einlassventil (30) durch eine Leitung (21) mit dem Lufteinlass (11) verbunden ist, und wobei die einstellbare Drosselklappe (40) in der Leitung (21) zwischen dem Kurbelgehäuse (13) und dem Einlassventil (30) ist.
  7. Kompressor nach Anspruch 6, bei dem die Kolbenstufe (14a, b, c) zwei parallel geschaltete Kolben enthält und jeder Kolben eine einstellbare Drosselklappe (40) aufweist, die in der das Einlassventil (30) und das Kurbelgehäuse (13) verbindenden Leitung (21) montiert ist.
  8. Kompressor nach einem der vorhergehenden Ansprüche, wobei, wenn die Drosselklappe (40) im Wesentlichen geschlossen ist, ein kleiner Spalt oder ein Leck verbleibt, der/das einen gewissen Zustrom vom Lufteinlass (11) erlaubt.
EP07841639.3A 2006-09-05 2007-08-30 Ölfreies luft-hubkolbenkompressorsystem mit einlassdrossel Not-in-force EP2059679B1 (de)

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 EP2059679A2 (de) 2009-05-20
EP2059679A4 EP2059679A4 (de) 2016-12-21
EP2059679B1 true EP2059679B1 (de) 2020-11-04

Family

ID=39157960

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07841639.3A Not-in-force EP2059679B1 (de) 2006-09-05 2007-08-30 Ölfreies luft-hubkolbenkompressorsystem mit einlassdrossel

Country Status (5)

Country Link
US (1) US20100054958A1 (de)
EP (1) EP2059679B1 (de)
AU (1) AU2007292454B2 (de)
CA (1) CA2662495C (de)
WO (1) WO2008030760A2 (de)

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US9856866B2 (en) 2011-01-28 2018-01-02 Wabtec Holding Corp. Oil-free air compressor for rail vehicles
DE102012003446A1 (de) * 2012-02-21 2013-08-22 Linde Aktiengesellschaft Verdichten eines kryogenen Mediums
USD742419S1 (en) * 2014-09-15 2015-11-03 Gary Armstrong Centripetal air/oil separator for drysump systems
DE102014113598A1 (de) 2014-09-19 2016-03-24 Knorr-Bremse Systeme für Schienenfahrzeuge GmbH Mehrstufiger Kolbenkompressor mit einer äußeren Kühlluftführung
JP6698461B2 (ja) * 2016-07-26 2020-05-27 株式会社神戸製鋼所 ガス漏れ判定方法及び多段圧縮機
CN106194651B (zh) * 2016-08-31 2019-07-05 瑞立集团瑞安汽车零部件有限公司 一种电动无油主空压机
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DE102022134427A1 (de) * 2022-12-21 2024-06-27 Voith Patent Gmbh Kolbenkompressor mit Leerlauffunktion

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Also Published As

Publication number Publication date
CA2662495A1 (en) 2008-03-13
EP2059679A4 (de) 2016-12-21
EP2059679A2 (de) 2009-05-20
WO2008030760A2 (en) 2008-03-13
US20100054958A1 (en) 2010-03-04
WO2008030760A3 (en) 2008-10-02
AU2007292454A1 (en) 2008-03-13
CA2662495C (en) 2015-12-01
AU2007292454B2 (en) 2013-07-18

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