EP0883749B1 - Kompressor - Google Patents

Kompressor Download PDF

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Publication number
EP0883749B1
EP0883749B1 EP97902446A EP97902446A EP0883749B1 EP 0883749 B1 EP0883749 B1 EP 0883749B1 EP 97902446 A EP97902446 A EP 97902446A EP 97902446 A EP97902446 A EP 97902446A EP 0883749 B1 EP0883749 B1 EP 0883749B1
Authority
EP
European Patent Office
Prior art keywords
shaft
compressor
hollow
tie bolt
rotor 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.)
Expired - Lifetime
Application number
EP97902446A
Other languages
English (en)
French (fr)
Other versions
EP0883749A1 (de
Inventor
Richard Julius Gozdawa
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.)
Corac Group PLC
Original Assignee
Corac Group PLC
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 Corac Group PLC filed Critical Corac Group PLC
Publication of EP0883749A1 publication Critical patent/EP0883749A1/de
Application granted granted Critical
Publication of EP0883749B1 publication Critical patent/EP0883749B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
    • F04D29/056—Bearings
    • F04D29/0566—Ceramic bearing designs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
    • F04D29/056—Bearings
    • F04D29/057—Bearings hydrostatic; hydrodynamic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/582—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps

Definitions

  • This invention relates to compressors.
  • compressors which provide a supply of compressed air or other working gas which is free of oil or other bearing lubricating material.
  • This type of compressor is desirable when a source of compressed air is used to process food, pharmaceutical or other sensitive material which must not be contaminated by any substance borne with the gas.
  • Attempts to design oil free compressors in the past have met with varying degrees of success but a problem still remains in achieving good cooling of the compressor mechanism, particularly with high speed rotary type compressors.
  • WO-A-95/24563 discloses a compressor in accordance with the preamble of claim 1.
  • a compressor comprising a rotatable shaft, drive means for rotating the shaft, at least one impeller rotor stage mounted on the shaft, and a tie bolt mounted through said at least one impeller rotor stage and through at least part of the shaft to hold said at least one impeller rotor stage to the shaft, wherein the rotatable shaft and said at least one impeller rotor stage are hollow, characterised in that the tie bolt has a hollow interior to enable a supply of liquid to be provided to flow axially through the rotatable shaft and said at least one impeller rotor stage, via the hollow interior of the tie bolt, as a coolant liquid.
  • the coolant fluid may be water or other suitable liquid.
  • the compressor shown in the figure is a two-stage turbo-compressor but may of course have more stages than this. It is usual to have two or more stages in a compressor of this type.
  • the compressor is driven directly by a high speed DC motor, shown as stator 1 and rotor 10, which may be arranged to drive at a speed of, say, 50,000-100,000 rpm, although this figure may vary depending on the use required of the compressor.
  • the motor is controlled by an invertor (not shown) to run directly at the speed required by the compressor and thereby avoid the necessity for a speed-increasing gear box and its associated lubrication system.
  • the motor is used to rotate the rotor 10 in conventional manner.
  • the shaft carries permanent magnets 10a which are acted upon by the stator windings. This is connected to two turbo-compressor stages 2 and 3, the motor being positioned between the two compressor stages.
  • Journal bearings 4, 5 are provided which support the shaft radially.
  • the journal bearings will typically be hydrostatic, gas pressurised, ones with the process air or gas as the supporting medium. Since any compressor takes a finite time to start up the bearings are initially supplied with air or gas from a small accumulator 8 but once the compressor is up to speed then the supply is taken direct from the compressor. Many types of bearing may be used successfully with this arrangement.
  • the design of the compressor stages 2, 3 is preferably such that any axial thrust is minimised, it will generally be found necessary to include a thrust bearing in the system. In the embodiment shown, this is in the form of a spiral groove thrust bearing 6, 7 which is used to carry any residual axial load. This spiral groove bearing also preferably operates using the process air or gas of the system.
  • the shaft assembly itself comprises four main hollow components.
  • a central rotor portion 10 lies wholly within the motor stator 1 and carries the permanent magnets 10a as described above. At each end of this central portion is a respective one of two end pieces 9, 11 which provide the bearing journals 4, 5 and also the thrust collar 6a for the thrust bearings 6, 7.
  • the bearings are mounted outboard of the motor and inboard of the impellers, the thrust bearing being on the portion between the motor and the second impeller stage 3.
  • Each of the outer portions is spigotted to the centre portion and respective impellers 15 and 16 are located by spigots onto the outer portions 9 and 11.
  • an in-line system results in which central portion 10, outer portions 9, 11 and impellers 15 and 16 all rotate together under the action of motor 1.
  • the assembly is clamped together by means of a hollow tie bolt 12 running axially through their common hollow centres.
  • the tie bolt is hollow to allow for cooling water to be passed through it, and thereby through the centre of the shaft, impeller assembly during operation.
  • each of the stages in the described embodiment comprises a backward sloping impeller 15, 16 followed by a vaned or vaneless diffuser or a pipe diffuser 17, 18 and this is sized to give maximum static pressure recovery before delivery the air into a low loss scroll 19, 20.
  • the design of impellers, diffusers and scrolls is of course well known.
  • the air or gas to be processed is arranged to enter the first compressor stage at a direction perpendicular to the machine's axis through a row of variable inlet guide vanes 21.
  • This feature of the gas entering from a direction other than in-line and with variable guide vanes offers a considerable degree of flow control which is not possible with positive displacement type machines.
  • the air or gas is then acted upon by the impeller 15 and leaves this stage at portion 2a in the figure to enter an intercooler (not shown). Intercoolers themselves are well known and the intercooler has not been shown for clarity.
  • the air or gas then passes through the intercooler before entering the second impeller stage at 3a. The process ensures a low power consumption and reduces the degree of after cooling which may be required in some applications.
  • the air or gas is enacted upon by the second impeller 16 and allowed the exit the system in its processed form.
  • the rotor mechanism (rotors, shaft, etc) is entirely or partially of ceramic. This helps to achieve thermal stability and lightness in the machine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Thermal Sciences (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Compressor (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Claims (9)

  1. Verdichter mit einer drehbaren Welle, Antriebsmitteln zur Drehung der Welle, wenigstens einer an der Welle befestigten Verdichterlaufradstufe (15, 16) und einem durch besagte wenigstens eine Verdichterlaufradstufe (15, 16) und durch wenigstens einen Teil der Welle geführten Ankerbolzen (12) zur Halterung der besagten wenigstens einen Verdichterlaufradstufe (15, 16) an besagter Welle, worin die drehbare Welle und besagte wenigstens eine Verdichterlaufradstufe (15, 16) hohl sind,
    dadurch gekennzeichnet, daß der Ankerbolzen (12) innen hohl ist, so daß eine Flüssigkeit zugeführt werden kann, die über das hohle Innere des Ankerbolzens (12) axial als Kühlflüssigkeit durch die drehbare Welle und besagte wenigstens eine Verdichterlaufradstufe (15, 16) fließt.
  2. Verdichter nach Anspruch 1, worin die Welle aus mehreren hohlen Wellenabschnitten besteht.
  3. Verdichter nach Anspruch 2, worin der hohle Ankerbolzen (12) durch besagte mehrere hohle Wellenabschnitte gesteckt ist.
  4. Verdichter nach einem beliebigen der vorangehenden Ansprüche, worin nicht umlaufende Kupplungsmittel (13, 14) vorgesehen sind, um eine Kühlflüssigkeitsquelle mit entsprechenden gegenüberliegenden Ein- und Auslaßenden des Ankerbolzens (12) zu kuppeln.
  5. Verdichter nach einem beliebigen der vorangehenden Ansprüche, worin die Laufräder aus Keramikwerkstoff hergestellt sind.
  6. Verdichter nach einem beliebigen der vorangehenden Ansprüche, in welchem Radial- und/oder Axiallager (4, 5) vorgesehen sind, die wenigstens teilweise von dem Prozeßgas bzw. Luft betrieben werden.
  7. Verfahren zur Kühlung eines Laufrades eines Verdichters mit einer hohlen Welle, Mitteln zum Drehen der Welle, wenigstens einer an der Welle befestigten hohlen. Verdichterlaufradstufe (15, 16) und einem durch wenigstens einen Teil der Welle und durch besagte wenigstens eine Verdichterlaufradstufe (15, 16) geführten Ankerbolzen (12) zur Halterung der besagten wenigstens einen Verdichterlaufradstufe (15, 16) an besagter Welle, worin besagter Ankerbolzen (12) innen hohl ist, welches Verfahren beinhaltet, daß eine Zufuhr von Kühlflüssigkeit bereitgestellt wird, und besagte Kühlflüssigkeit zur axialen Strömung durch die Welle und besagte wenigstens eine Verdichterlaufradstufe (15, 16) durch das hohle Innere des besagten Ankerbolzens (12) gebracht wird, um so die Verdichterstufe zu kühlen.
  8. Verfahren nach Anspruch 7, worin besagte Kühlflüssigkeit Wasser ist.
  9. Verfahren nach Anspruch 8, worin besagte Kühlflüssigkeit erst dann zum Fließen gebracht wird, wenn eine mittlere Geschwindigkeit bei der Beschleunigung des Verdichters aus dem Stillstand erreicht ist.
EP97902446A 1996-02-02 1997-01-31 Kompressor Expired - Lifetime EP0883749B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9602126 1996-02-02
GBGB9602126.6A GB9602126D0 (en) 1996-02-02 1996-02-02 Compressors
PCT/GB1997/000292 WO1997028372A1 (en) 1996-02-02 1997-01-31 Compressors

Publications (2)

Publication Number Publication Date
EP0883749A1 EP0883749A1 (de) 1998-12-16
EP0883749B1 true EP0883749B1 (de) 2001-12-05

Family

ID=10788015

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97902446A Expired - Lifetime EP0883749B1 (de) 1996-02-02 1997-01-31 Kompressor

Country Status (6)

Country Link
EP (1) EP0883749B1 (de)
AT (1) ATE210246T1 (de)
AU (1) AU1609197A (de)
DE (1) DE69708850T2 (de)
GB (1) GB9602126D0 (de)
WO (1) WO1997028372A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9839428B2 (en) 2013-12-23 2017-12-12 Ethicon Llc Surgical cutting and stapling instruments with independent jaw control features
US10098642B2 (en) 2015-08-26 2018-10-16 Ethicon Llc Surgical staples comprising features for improved fastening of tissue

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3799121B2 (ja) 1997-03-19 2006-07-19 株式会社 日立インダストリイズ ２段遠心圧縮機
GB9716494D0 (en) 1997-08-05 1997-10-08 Gozdawa Richard J Compressions
DE19917958B4 (de) * 1999-04-21 2014-03-06 Institut für Luft- und Kältetechnik gemeinnützige Gesellschaft mbH Kühleinrichtung für Elektromotoren
EP1321680A3 (de) * 2001-12-22 2003-12-10 Miscel Oy Stömungsmaschinen-Aggregat
DE102009054773A1 (de) * 2009-12-16 2011-06-22 Piller Industrieventilatoren GmbH, 37186 Turboverdichter und Verdichteranlage umfassend einen derartigen Turboverdichter
KR102268282B1 (ko) * 2015-01-13 2021-06-22 엘지전자 주식회사 터보압축기 및 그를 갖는 냉동기

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2888193A (en) * 1957-02-14 1959-05-26 Garrett Corp Motor driven compressor
US3133693A (en) * 1962-05-17 1964-05-19 Gen Electric Sump seal system
FR1352260A (fr) * 1963-01-04 1964-02-14 Aspirateur
JP2749691B2 (ja) * 1989-06-06 1998-05-13 日本碍子株式会社 セラミックターボチャージャロータ
GB9404436D0 (en) * 1994-03-08 1994-04-20 Welsh Innovations Ltd Compressor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9839428B2 (en) 2013-12-23 2017-12-12 Ethicon Llc Surgical cutting and stapling instruments with independent jaw control features
US10098642B2 (en) 2015-08-26 2018-10-16 Ethicon Llc Surgical staples comprising features for improved fastening of tissue

Also Published As

Publication number Publication date
AU1609197A (en) 1997-08-22
DE69708850T2 (de) 2002-07-18
EP0883749A1 (de) 1998-12-16
DE69708850D1 (de) 2002-01-17
GB9602126D0 (en) 1996-04-03
WO1997028372A1 (en) 1997-08-07
ATE210246T1 (de) 2001-12-15

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