EP1473464A1 - Kreiselverdichter mit überhängendem Rotor - Google Patents

Kreiselverdichter mit überhängendem Rotor Download PDF

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Publication number
EP1473464A1
EP1473464A1 EP04290914A EP04290914A EP1473464A1 EP 1473464 A1 EP1473464 A1 EP 1473464A1 EP 04290914 A EP04290914 A EP 04290914A EP 04290914 A EP04290914 A EP 04290914A EP 1473464 A1 EP1473464 A1 EP 1473464A1
Authority
EP
European Patent Office
Prior art keywords
compressor
impeller
rotor
pipe
compressor according
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
Application number
EP04290914A
Other languages
English (en)
French (fr)
Other versions
EP1473464B1 (de
Inventor
Jean-Marc Pugnet
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.)
Thermodyn SAS
Original Assignee
Thermodyn SAS
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 Thermodyn SAS filed Critical Thermodyn SAS
Publication of EP1473464A1 publication Critical patent/EP1473464A1/de
Application granted granted Critical
Publication of EP1473464B1 publication Critical patent/EP1473464B1/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
    • F04D29/08—Sealings
    • F04D29/16—Sealings between pressure and suction sides
    • F04D29/161—Sealings between pressure and suction sides especially adapted for elastic fluid pumps
    • F04D29/162—Sealings between pressure and suction sides especially adapted for elastic fluid pumps of a centrifugal flow wheel
    • 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
    • F04D29/051—Axial thrust balancing
    • F04D29/0516—Axial thrust balancing balancing pistons

Definitions

  • the invention relates to a centrifugal compressor unit and, in particular, a centrifugal compressor for compressor group of the cantilever type.
  • the invention relates to the balancing of the axial thrust of a centrifugal compressor when it is put into service, to allow starting even with a machine left behind pressurized when stopped.
  • a compressor unit of the conventional cantilever type conventionally includes a means motor 10, constituted for example by an electric motor or by a turbine arranged inside a casing 12 and driving in rotation a rotor 14, which is held in position by a set of bearings radial, such as 16, and axial bearings, such as 18.
  • the turbocharger includes a compressor 20.
  • the compressor 20 is a single stage compressor.
  • This compressor includes an impeller 22 driven in rotation by the rotor 14 in a stator 24 ensuring, on the one hand, an increase in pressure static of an incident gas, sucked in the direction represented by the arrow F1 from an intake pipe 26 and, on the other hand, a increase in the kinetic energy of this gas.
  • the gas Downstream of the wheel 22, the gas is collected by an outlet volute 28 in order to channel it, then slow it down, thus turning part of the pressure significant of its kinetic energy, then is delivered at the output of the compressor according to arrow F2.
  • the increase in pressure of the gas in the paddle wheel 22 causes an axial reaction force, directed towards the entry of gas into the wheel. This is why the compressor is provided means for balancing the axial thrust thus generated.
  • compressors are generally kept under pressure when they are stopped.
  • this pressure maintenance of the compressor generates, when stationary, forces on the impeller 22 causing the appearance a resultant force on the rotor, which applies to the packing shaft end sealing, on a surface defined by a diameter seal.
  • the axial thrust balancing means are effective in compensating for the forces exerted on the rotor during operation of the turbocharger, they are ineffective for compensate for the axial thrust exerted on the seal at the end of the shaft, when the compressor stops while the compressor is kept under pressure when stopped.
  • the object of the invention is therefore to overcome this drawback and to supply a compressor for centrifugal compressor group of the type overhang capable of balancing the axial thrust generated on the rotor at compressor stop.
  • the invention therefore relates to a centrifugal compressor for cantilever type compressor unit comprising a set at least one compression impeller mounted on a rotor intended to be rotated by a motor means in a body stator and means for compensating the axial thrust which is generated by the force exerted by the gas on the impeller and which is applied to the rotor.
  • the compensation means are adapted to compensate for the thrust axial supported by the rotor when the compressor stops.
  • the compensation means include means for generate a depression on one of the faces capable of compensating for the less in part said axial thrust.
  • the vacuum is formed on the wheel of the first compression stage.
  • the face on which generates the depression is therefore the suction side of a gas handled by the compressor.
  • the stator body comprises a through pipe opening opposite said face of the wheel.
  • the leading edge of the blades of the impeller has a front flange with an axial annular shoulder delimited by two cylindrical portions of increasing diameter of the edge leading to the trailing edge of the wheel, the pipe emerging opposite this annular shoulder.
  • the pipeline leads to the exterior of the compressor and is advantageously equipped with a pressure regulating device suitable for sealing said pipeline during compressor operation and to open said pipe at compressor stop.
  • FIG 2 there is shown a centrifugal compressor of a compressor unit of the cantilever type.
  • the compressor is a single stage compressor.
  • the invention also applies to the production of a compressor multi-storey, for example two storeys.
  • the compressor portion shown in this figure 2 is intended to be part of a group centrifugal compressor cantilever type compressor, i.e. a group compressor which comprises a motor means, for example a motor electric or a turbine driving in rotation a rotor 28, of which only a part has been shown, on which is directly mounted a compressor.
  • a group centrifugal compressor cantilever type compressor i.e. a group compressor which comprises a motor means, for example a motor electric or a turbine driving in rotation a rotor 28, of which only a part has been shown, on which is directly mounted a compressor.
  • the compressor meanwhile, has a number stator elements, such as 30 and 32, jointly delimiting a intake pipe 34 through which the gas to be handled is sucked in, and downstream, considering the direction of gas distribution in the compressor, a diffuser 36, which opens into a volute of repression (not shown).
  • a number stator elements such as 30 and 32, jointly delimiting a intake pipe 34 through which the gas to be handled is sucked in, and downstream, considering the direction of gas distribution in the compressor, a diffuser 36, which opens into a volute of repression (not shown).
  • a paddle wheel 38 is integral with the rotor 28. This paddle wheel has, at its leading edge, a front flange 40 and, at trailing edge level, a rear flange 42.
  • the body stator consisting of the aforementioned elements 30 and 32, is provided a pipe 44 passing through the body and, in particular, the element stator designated by the reference numeral 30, so as to put at atmospheric pressure an axial annular portion 46 of the flange before 40. It can be seen in particular in this FIG. 2 that the pipe 44 opens into a cavity 48 formed between the stator body and the front flange 40, in the vicinity of this annular surface 46.
  • This surface 46 is delimited by a first cylindrical portion 50 of the front flange 40 and by a second cylindrical portion 52 of outer diameter greater than the first portion 50 and arranged coaxially respectively towards the front of the compressor and towards the back of the compressor, considering the gas flow at the inlet compressor.
  • two labyrinth seals 54 and 56 are interposed between the stator body and the first and second cylindrical portions 50 and 52, respectively.
  • the axial annular surface 46 has dimensions corresponding to those of the seal of so that the pressures are validly compensated. The stop of the compressor is relieved, and it can easily start.
  • line 44 is connected to the torches 58 via a pressure regulating device 60.
  • This device comprises a valve 62 controlled at the opening and at the closing by a control device 64.
  • Measuring means 66 of the pressure prevailing in the line 44 provide information as to the pressure prevailing in line 44, and therefore in the cavity 48.
  • the control device 64 is duly programmed to depressurize cavity 48 during start-up of the compressor and to close line 44 by acting on the valve 62 during normal operation of the compressor.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP04290914A 2003-04-28 2004-04-06 Kreiselverdichter mit überhängendem Rotor Expired - Lifetime EP1473464B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0305185 2003-04-28
FR0305185A FR2854208B1 (fr) 2003-04-28 2003-04-28 Compresseur pour groupe compresseur centrifuge de type en porte-a-faux

Publications (2)

Publication Number Publication Date
EP1473464A1 true EP1473464A1 (de) 2004-11-03
EP1473464B1 EP1473464B1 (de) 2010-11-10

Family

ID=32982318

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04290914A Expired - Lifetime EP1473464B1 (de) 2003-04-28 2004-04-06 Kreiselverdichter mit überhängendem Rotor

Country Status (3)

Country Link
EP (1) EP1473464B1 (de)
DE (1) DE602004029956D1 (de)
FR (1) FR2854208B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITCO20100025A1 (it) * 2010-05-11 2011-11-12 Nuovo Pignone Spa Configurazione di tamburo di bilanciamento per rotori di compressore

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4385768A (en) * 1979-07-19 1983-05-31 Rotoflow Corporation, Inc. Shaft mounting device and method
FR2592688A1 (fr) * 1986-01-08 1987-07-10 Alsthom Turbomachine.
EP0373817A1 (de) * 1988-12-13 1990-06-20 Nova Corporation Of Alberta Gasverdichter mit Trockenabdichtung auf einer überhängende Radwelle
US5141389A (en) * 1990-03-20 1992-08-25 Nova Corporation Of Alberta Control system for regulating the axial loading of a rotor of a fluid machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4385768A (en) * 1979-07-19 1983-05-31 Rotoflow Corporation, Inc. Shaft mounting device and method
FR2592688A1 (fr) * 1986-01-08 1987-07-10 Alsthom Turbomachine.
EP0373817A1 (de) * 1988-12-13 1990-06-20 Nova Corporation Of Alberta Gasverdichter mit Trockenabdichtung auf einer überhängende Radwelle
US5141389A (en) * 1990-03-20 1992-08-25 Nova Corporation Of Alberta Control system for regulating the axial loading of a rotor of a fluid machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITCO20100025A1 (it) * 2010-05-11 2011-11-12 Nuovo Pignone Spa Configurazione di tamburo di bilanciamento per rotori di compressore
EP2386763A3 (de) * 2010-05-11 2017-11-22 Nuovo Pignone S.p.A. Druckausgleichkolben

Also Published As

Publication number Publication date
DE602004029956D1 (de) 2010-12-23
FR2854208A1 (fr) 2004-10-29
FR2854208B1 (fr) 2008-02-15
EP1473464B1 (de) 2010-11-10

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