EP3121449B1 - Subsea centrifugal compressor with horizontal shaft and with only one axial thrust bearing - Google Patents

Subsea centrifugal compressor with horizontal shaft and with only one axial thrust bearing Download PDF

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Publication number
EP3121449B1
EP3121449B1 EP15306191.6A EP15306191A EP3121449B1 EP 3121449 B1 EP3121449 B1 EP 3121449B1 EP 15306191 A EP15306191 A EP 15306191A EP 3121449 B1 EP3121449 B1 EP 3121449B1
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EP
European Patent Office
Prior art keywords
compressor
motor
rotor
shaft
compressor unit
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.)
Active
Application number
EP15306191.6A
Other languages
German (de)
French (fr)
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EP3121449A1 (en
Inventor
Massimo Camatti
Pierre Laboube
Roberto Esposito
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
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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
Priority to EP15306191.6A priority Critical patent/EP3121449B1/en
Priority to AU2016295175A priority patent/AU2016295175B2/en
Priority to US15/745,514 priority patent/US20180209434A1/en
Priority to PCT/EP2016/067438 priority patent/WO2017013218A1/en
Publication of EP3121449A1 publication Critical patent/EP3121449A1/en
Application granted granted Critical
Publication of EP3121449B1 publication Critical patent/EP3121449B1/en
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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
    • F04D29/051—Axial thrust balancing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • F04D17/10—Centrifugal pumps for compressing or evacuating
    • F04D17/12—Multi-stage pumps
    • F04D17/122—Multi-stage pumps the individual rotor discs being, one for each stage, on a common shaft and axially spaced, e.g. conventional centrifugal multi- stage compressors
    • 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
    • F04D25/0686—Units comprising pumps and their driving means the pump being electrically driven specially adapted for submerged use
    • 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
    • F04D29/053—Shafts
    • F04D29/054—Arrangements for joining or assembling shafts
    • 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
    • F04D29/058—Bearings magnetic; electromagnetic
    • 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
    • F04D29/10—Shaft sealings
    • F04D29/102—Shaft sealings especially adapted for elastic fluid pumps
    • 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • 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
    • F04D29/5806—Cooling the drive system
    • 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
    • F04D29/5826—Cooling at least part of the working fluid in a heat exchanger

Definitions

  • the present invention relates to a turbocompressor or a motor compressor, and particularly to an integrated motor compressor unit.
  • the present invention relates to a motor compressor unit for subsea applications.
  • Motor compressor units of the integrated type comprise a motor means, generally an electric drive motor, and a compressor having one or more compression stages, depending on the applications, the motor means and the compressor being mounted in a common casing that is sealed against the gas handled by the compressor unit.
  • Each compression stage comprises a bladed impeller mounted on a shaft driven by a rotor, which is driven by the motor means.
  • the motor compressor when used under special operating conditions, especially for underwater operations, is usually arranged vertically to facilitate draining of the interior of the casing.
  • a compressor unit of this type is already known from US 2009/0 220 362 in which, in addition, the shaft of the compressor and the rotor driven by the motor means are coupled to form one common shaft that rotates around a vertical axis.
  • the shaft and the rotor are coupled using a twistable shaft that transmits the rotational moments between the motor means and the compressor and, as far as possible, mutually decouples the driven shaft and the rotor from vibrations.
  • the pressure difference on the opposite sides of the compression stages generate a thrust on the compressor that is transmitted via the twistable coupling to the rotor and to a thrust bearing provided at one end of the common shaft, namely on the upper end of the of the motor rotor.
  • the common shaft being arranged vertically, only one common thrust bearing is required for the motor and the compressor.
  • the thrust is directed in opposition to the weight forces of the common shaft, including the twistable coupling and the compression stages, such that a thrust balance is in addition carried out by the weight of the common shaft.
  • This problem may in particular incur at high loads, due to a thermal expansion of the compressor shaft driven by the motor means and may arise for compressor units having a high pressure ratio, namely above 3, and having an increased number of compression stages, equal or higher than 3.
  • motor compressor units having a common casing in which are mounted a compressor having one or several compression stages mounted on a compressor shaft and a motor having a rotor driving the shaft of the compressor around a vertical axis, and in which the compressor shaft and the rotor are assembled together using a rigid coupling to form a common shaft supported by three radial bearings.
  • Such an arrangement does not permit, however, to increase the number of the compression stages such that the motor compressor unit cannot be equipped with more than three compression stages.
  • one object of the present invention is to alleviate the above-mentioned drawbacks of the motor compressor units according to the state of the art.
  • a further purpose of the present invention is to provide a centrifugal compressor unit for subsea applications in which the problem of axial displacement of the bladed wheels mounted on the compressor shaft are overcome.
  • the invention thus proposes a subsea centrifugal compressor unit according to claim 1.
  • the rotor and the driven shaft form one common shaft, said compressor unit having a set of three radial bearings for supporting said shaft, said set of radial bearings comprising two bearings being provided on the motor side and one bearing being provided on the compressor side.
  • the rotor and the driven shaft are connected by means of a flexible coupling that is tortionally flexible and axially unflexible, the compressor unit further comprising a set of four radial bearings for supporting each end of the rotor and the driven shaft.
  • the bearings namely the axial bearing and the radial bearings for supporting the driven shaft or the rotor are magnetic bearings.
  • a gas cooler is part of a closed loop extending partly outside the casing.
  • the casing of the subsea centrifugal compressor unit according to the claimed invention may be pressurized.
  • FIG. 1 shows a centrifugal compressor unit 1 which is not according to the invention, for subsea applications, having a motor 2 and one or more compressor(s) 3 mounted in a common casing 4 leak tight to the gas manipulated by the compressor 3.
  • the casing 4 comprises two casing elements fixed together by appropriate attachment means, the one, denoted by numeral reference 5, accommodating the motor 2 and the other, denoted by reference 6, accommodating the compressor.
  • the casing elements are intended to provide support and protection for the motor and the compressor, respectively.
  • the casing 2 is provided with a gas inlet orifice I facing the first compression stage of the compressor and an outlet orifice O facing the last compression stage.
  • the casing element assembly is intended to be pressurized and immersed and is arranged on a base such that the compressor unit is arranged horizontally.
  • the motor 2 is formed by an electric motor, for example a high rotation speed motor (6000 to 16 000 rpm) supplied by a frequency variator and comprising a stator 7 and a rotor 8 supported by two radial end radial bearings 9 and 10.
  • a high rotation speed motor (6000 to 16 000 rpm) supplied by a frequency variator and comprising a stator 7 and a rotor 8 supported by two radial end radial bearings 9 and 10.
  • the compressor 3 comprises a shaft 11 driven by the motor rotor and supported by a set of two radial end bearings 12 and 13 and a set of bladed wheels 14 mounted on the driven shaft and defining each a compression stage for the compressor.
  • the bearings are rigidly fixed to the casing and are formed by active magnetic bearings that are controlled such that they can adapt to the dynamic behavior of the rotor or the driven shaft that they support.
  • the rotor 8 and the driven shaft 11 are linked via a flexible coupling that is radially flexible and axially unflexible to dynamically reduce the amplitude of the noise generated by ventilation when the compressor is rotated while efficiently propagating an axial thrust generated by the bladed wheels to the rotor of the motor.
  • the pressure differences generated at each compression stage generate a thrust on the driven shaft which is transmitted to an axial thrust bearing 16, for example an axial active magnetic bearing that is provided at the free end of the driven shaft 11, namely at the end opposite to the rotor of the motor 2.
  • the axial bearing 16 is located on the compressor side, namely as close as possible to the active portion of the compressor shaft such that the axial bearing 16 is more appropriate to compensate for the thermal expansion of the shaft and to more accurately guarantee the axial position of the driven shaft and of the rotating bladed wheels within the second casing element 6.
  • each of the rotor and the driven shaft can keep it on vibration behavior while the thrust generated during operation of the completion stages is supported by one first bearing only provided on the compressor side of the compressor unit.
  • the compressor unit may comprise a large number of compression stages, namely above 3, and provide a high pressure ratio, namely above 3.
  • such a subsea compressor unit may provide a pressure between 80 and 150 bars.
  • the compressor may comprise up to 8 compression stages and provide a pressure ratio up to 3 or 3,5.
  • the subsea centrifugal compressor unit is provided with cooling means for cooling the motor as well as the bearings.
  • the subsea compressor unit may be provided with a cooling system having a cooling loop lying between the first compression stage and one side of the motor opposite to the compressor or, alternatively but not according to the invention, flying between both sides of the rotor, as illustrated, to provide cooling in closed loop.
  • the cooling system comprises a gas cooler 18 lying outside the casing 2 and therefore in a contact with the cold deep water at constant temperature.
  • the cooling means is arranged as an open loop with a clean gas supply 19 entering the first casing element 2 at one side of the rotor opposite to the compressor.
  • the rotor is provided with an additional bladed wheel 20 such that the clean gas supply is directed to the motor, through the radial bearing 9 and to the compressor through a barrier seal 21 provided between the flexible coupling 15 and the compressor.
  • an additional axial thrust bearing 17 may be used, in such a case, to compensate for the thrust generated by the motor internal pressure drop to the cooling flow.
  • the compressor unit comprises a rotor and a shaft supporting the compression stages that are linked using a flexible coupling and having four radial bearings for supporting the respective free ends of the rotor and of the driven shaft.
  • the compressor unit may comprise a common rigid shaft or a rotor and a stator that are linked using a rigid coupling, namely a coupling that is axially and tortionally unflexible.
  • the common shaft may be supported by two radial bearings on the motor side and by one radial bearing at the compressor side, with one axial bearing only.
  • This arrangement also permits to have a large number of compression stages, namely above 3, and provide a high pressure ratio, for example above 3.

Description

  • The present invention relates to a turbocompressor or a motor compressor, and particularly to an integrated motor compressor unit.
  • More particularly, the present invention relates to a motor compressor unit for subsea applications.
  • Motor compressor units of the integrated type comprise a motor means, generally an electric drive motor, and a compressor having one or more compression stages, depending on the applications, the motor means and the compressor being mounted in a common casing that is sealed against the gas handled by the compressor unit.
  • Each compression stage comprises a bladed impeller mounted on a shaft driven by a rotor, which is driven by the motor means.
  • According to the state of the art, when used under special operating conditions, especially for underwater operations, the motor compressor is usually arranged vertically to facilitate draining of the interior of the casing.
  • A compressor unit of this type is already known from US 2009/0 220 362 in which, in addition, the shaft of the compressor and the rotor driven by the motor means are coupled to form one common shaft that rotates around a vertical axis. The shaft and the rotor are coupled using a twistable shaft that transmits the rotational moments between the motor means and the compressor and, as far as possible, mutually decouples the driven shaft and the rotor from vibrations.
  • Besides, in operation, the pressure difference on the opposite sides of the compression stages generate a thrust on the compressor that is transmitted via the twistable coupling to the rotor and to a thrust bearing provided at one end of the common shaft, namely on the upper end of the of the motor rotor. The common shaft being arranged vertically, only one common thrust bearing is required for the motor and the compressor.
  • The thrust is directed in opposition to the weight forces of the common shaft, including the twistable coupling and the compression stages, such that a thrust balance is in addition carried out by the weight of the common shaft.
  • However, this type of arrangement in which the rotor is axially supported by one thrust bearing has the disadvantage that the coupling between the rotor of the motor and the compressor shaft may be prejudicial to the accuracy of the axial position of the rotating elements of the compressor which may impact the motor compressor efficiency, in particular during transient phases.
  • This problem may in particular incur at high loads, due to a thermal expansion of the compressor shaft driven by the motor means and may arise for compressor units having a high pressure ratio, namely above 3, and having an increased number of compression stages, equal or higher than 3.
  • Other arrangements of motor compressor units are known, having a common casing in which are mounted a compressor having one or several compression stages mounted on a compressor shaft and a motor having a rotor driving the shaft of the compressor around a vertical axis, and in which the compressor shaft and the rotor are assembled together using a rigid coupling to form a common shaft supported by three radial bearings.
  • Such an arrangement does not permit, however, to increase the number of the compression stages such that the motor compressor unit cannot be equipped with more than three compression stages.
  • Other documents illustrating the technical background of the invention are WO 2012/166438 A2 , US 6 464 469 B1 , US 4 969 803 A , US 2013/315755 A1 and US 6 455 964 B1 .
  • In view of the foregoing, one object of the present invention is to alleviate the above-mentioned drawbacks of the motor compressor units according to the state of the art.
  • A further purpose of the present invention is to provide a centrifugal compressor unit for subsea applications in which the problem of axial displacement of the bladed wheels mounted on the compressor shaft are overcome.
  • The invention thus proposes a subsea centrifugal compressor unit according to claim 1.
  • According to an embodiment of the invention, the rotor and the driven shaft form one common shaft, said compressor unit having a set of three radial bearings for supporting said shaft, said set of radial bearings comprising two bearings being provided on the motor side and one bearing being provided on the compressor side.
  • According to another embodiment, the rotor and the driven shaft are connected by means of a flexible coupling that is tortionally flexible and axially unflexible, the compressor unit further comprising a set of four radial bearings for supporting each end of the rotor and the driven shaft.
  • For example, the bearings, namely the axial bearing and the radial bearings for supporting the driven shaft or the rotor are magnetic bearings.
  • In a subsea centrifugal compressor unit that is not according to the claimed invention, a gas cooler is part of a closed loop extending partly outside the casing.
  • Advantageously, the casing of the subsea centrifugal compressor unit according to the claimed invention may be pressurized.
  • Other objects, features and advantages of the invention will become apparent from the following description, given only by way of example and in view of the following drawings in which:
    • Figure 1 illustrates the general features of a centrifugal compressor unit which is not according to the invention; and
    • Figure 2 illustrates a centrifugal compressor unit which is according to one embodiment of the claimed invention when the gas cooler (18) is disregarded.
  • Figure 1 shows a centrifugal compressor unit 1 which is not according to the invention, for subsea applications, having a motor 2 and one or more compressor(s) 3 mounted in a common casing 4 leak tight to the gas manipulated by the compressor 3.
  • The casing 4 comprises two casing elements fixed together by appropriate attachment means, the one, denoted by numeral reference 5, accommodating the motor 2 and the other, denoted by reference 6, accommodating the compressor.
  • The casing elements are intended to provide support and protection for the motor and the compressor, respectively. As illustrated, the casing 2 is provided with a gas inlet orifice I facing the first compression stage of the compressor and an outlet orifice O facing the last compression stage.
  • In operation, the casing element assembly is intended to be pressurized and immersed and is arranged on a base such that the compressor unit is arranged horizontally.
  • In the exemplary embodiment, the motor 2 is formed by an electric motor, for example a high rotation speed motor (6000 to 16 000 rpm) supplied by a frequency variator and comprising a stator 7 and a rotor 8 supported by two radial end radial bearings 9 and 10.
  • As illustrated, the compressor 3 comprises a shaft 11 driven by the motor rotor and supported by a set of two radial end bearings 12 and 13 and a set of bladed wheels 14 mounted on the driven shaft and defining each a compression stage for the compressor.
  • Therefore, the rotor of the motor turns in two radial end bearings 9 and 10, whereas the compressor shaft turns in two radial end bearings 12 and 13.
  • Advantageously, the bearings are rigidly fixed to the casing and are formed by active magnetic bearings that are controlled such that they can adapt to the dynamic behavior of the rotor or the driven shaft that they support.
  • As illustrated, the rotor 8 and the driven shaft 11 are linked via a flexible coupling that is radially flexible and axially unflexible to dynamically reduce the amplitude of the noise generated by ventilation when the compressor is rotated while efficiently propagating an axial thrust generated by the bladed wheels to the rotor of the motor.
  • As a matter of fact, in operation, the pressure differences generated at each compression stage generate a thrust on the driven shaft which is transmitted to an axial thrust bearing 16, for example an axial active magnetic bearing that is provided at the free end of the driven shaft 11, namely at the end opposite to the rotor of the motor 2.
  • As illustrated, preferably, the axial bearing 16 is located on the compressor side, namely as close as possible to the active portion of the compressor shaft such that the axial bearing 16 is more appropriate to compensate for the thermal expansion of the shaft and to more accurately guarantee the axial position of the driven shaft and of the rotating bladed wheels within the second casing element 6.
  • It should be appreciated that thanks to the use of the flexible coupling that is tortionally flexible and axially unflexible, each of the rotor and the driven shaft can keep it on vibration behavior while the thrust generated during operation of the completion stages is supported by one first bearing only provided on the compressor side of the compressor unit.
  • In addition, with such an arrangement in which the rotor and the shaft are connected by a flexible coupling and having four radial bearings and one axial bearing, the compressor unit may comprise a large number of compression stages, namely above 3, and provide a high pressure ratio, namely above 3.
  • It has been noted that such a subsea compressor unit may provide a pressure between 80 and 150 bars.
  • For example, the compressor may comprise up to 8 compression stages and provide a pressure ratio up to 3 or 3,5.
  • Referring now to figure 2, according to the claimed invention, the subsea centrifugal compressor unit is provided with cooling means for cooling the motor as well as the bearings.
  • In one embodiment, the subsea compressor unit may be provided with a cooling system having a cooling loop lying between the first compression stage and one side of the motor opposite to the compressor or, alternatively but not according to the invention, flying between both sides of the rotor, as illustrated, to provide cooling in closed loop.
  • In the latter case of a closed loop, the cooling system comprises a gas cooler 18 lying outside the casing 2 and therefore in a contact with the cold deep water at constant temperature.
  • According to the invention, the cooling means is arranged as an open loop with a clean gas supply 19 entering the first casing element 2 at one side of the rotor opposite to the compressor.
  • In such a case, the rotor is provided with an additional bladed wheel 20 such that the clean gas supply is directed to the motor, through the radial bearing 9 and to the compressor through a barrier seal 21 provided between the flexible coupling 15 and the compressor.
  • Referring back to figure 1, in a configuration that does not belong to the invention, an additional axial thrust bearing 17 may be used, in such a case, to compensate for the thrust generated by the motor internal pressure drop to the cooling flow.
  • At last, it should be noted that the invention is not limited to the disclosed embodiment.
  • As a matter of fact, according to the exemplary embodiments disclosed with reference to figures 1 and 2, the compressor unit comprises a rotor and a shaft supporting the compression stages that are linked using a flexible coupling and having four radial bearings for supporting the respective free ends of the rotor and of the driven shaft.
  • According to another embodiment, the compressor unit may comprise a common rigid shaft or a rotor and a stator that are linked using a rigid coupling, namely a coupling that is axially and tortionally unflexible.
  • With such an arrangement, the common shaft may be supported by two radial bearings on the motor side and by one radial bearing at the compressor side, with one axial bearing only. This arrangement also permits to have a large number of compression stages, namely above 3, and provide a high pressure ratio, for example above 3.

Claims (5)

  1. Subsea centrifugal compressor unit, comprising:
    - a motor (2) having a rotor (8),
    - at least one compressor (3) having a shaft (11) driven by the rotor; and
    - a set of bladed wheels (14) fitted on the driven shaft,
    said motor and said compressor being mounted in a common watertight casing (2) comprising a first casing element accommodating the motor and a second casing element accommodating the compressor, and further be provided with cooling means for cooling the motor and bearings of the subsea centrifugal compressor unit, wherein,
    in operation, the motor, the compressor and the casing having the motor and the compressor are arranged horizontally, and the compressor unit further comprises one axial thrust bearing only (16) on a compressor side, wherein the said cooling means are arranged as an open loop including a clean gas supply (19) entering the first casing element at one side of the rotor opposite of the compressor, an additional bladed wheel (20) provided on the rotor (8) for directing the clean gas supply to the motor (2), through a first radial bearing (9) supporting an end of the rotor (8) and to the compressor (3) through a seal (21) of the subsea centrifugal compressor unit, the seal (21) being between the motor, downstream the cooling means, and the compressor.
  2. Subsea centrifugal compressor unit according to claim 1 in which the rotor and the driven shaft form one common shaft, said compressor unit having a set of three radial bearings for supporting said shaft, two bearings being provided on the motor side and one bearing being provided on the compressor side.
  3. Subsea centrifugal compressor unit according to claim 1, in which the rotor and the driven shaft are connected by means of a flexible coupling (15) that is tortionally flexible and axially unflexible, and further comprising a set of four radial bearings (9, 10, 12, 13) including the first radial bearing for supporting each end of the rotor and the driven shaft.
  4. Subsea centrifugal compressor unit according to claim 2 or 3, wherein the radial bearings for supporting the driven shaft or the rotor are magnetic bearings.
  5. Subsea centrifugal compressor unit according to any of claims 1 to 4, wherein the axial bearing is a magnetic bearing.
EP15306191.6A 2015-07-22 2015-07-22 Subsea centrifugal compressor with horizontal shaft and with only one axial thrust bearing Active EP3121449B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP15306191.6A EP3121449B1 (en) 2015-07-22 2015-07-22 Subsea centrifugal compressor with horizontal shaft and with only one axial thrust bearing
AU2016295175A AU2016295175B2 (en) 2015-07-22 2016-07-21 Subsea centrifugal compressor with horizontal shaft and with only one axial thrust bearing
US15/745,514 US20180209434A1 (en) 2015-07-22 2016-07-21 Subsea centrifugal compressor with horizontal shaft and with only one axial thrust bearing
PCT/EP2016/067438 WO2017013218A1 (en) 2015-07-22 2016-07-21 Subsea centrifugal compressor with horizontal shaft and with only one axial thrust bearing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15306191.6A EP3121449B1 (en) 2015-07-22 2015-07-22 Subsea centrifugal compressor with horizontal shaft and with only one axial thrust bearing

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Publication Number Publication Date
EP3121449A1 EP3121449A1 (en) 2017-01-25
EP3121449B1 true EP3121449B1 (en) 2022-10-05

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EP15306191.6A Active EP3121449B1 (en) 2015-07-22 2015-07-22 Subsea centrifugal compressor with horizontal shaft and with only one axial thrust bearing

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US (1) US20180209434A1 (en)
EP (1) EP3121449B1 (en)
AU (1) AU2016295175B2 (en)
WO (1) WO2017013218A1 (en)

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AU2016295175B2 (en) 2020-07-02
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US20180209434A1 (en) 2018-07-26
WO2017013218A1 (en) 2017-01-26

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