US20220372994A1 - Integrated motor-compressor unit having a cooling circuit and a depressurization system configured to reduce pressure of the cooling fluid - Google Patents

Integrated motor-compressor unit having a cooling circuit and a depressurization system configured to reduce pressure of the cooling fluid Download PDF

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Publication number
US20220372994A1
US20220372994A1 US17/753,929 US201917753929A US2022372994A1 US 20220372994 A1 US20220372994 A1 US 20220372994A1 US 201917753929 A US201917753929 A US 201917753929A US 2022372994 A1 US2022372994 A1 US 2022372994A1
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US
United States
Prior art keywords
compressor
motor
depressurization system
integrated motor
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.)
Pending
Application number
US17/753,929
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English (en)
Inventor
Benjamin Defoy
Sylvain Guillemin
Thomas Alban
Gilles Nawrocki
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Thermodyn SAS
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Thermodyn SAS
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Publication date
Application filed by Thermodyn SAS filed Critical Thermodyn SAS
Publication of US20220372994A1 publication Critical patent/US20220372994A1/en
Pending legal-status Critical Current

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    • 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
    • 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
    • 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

Definitions

  • the field of the invention relates to integrated motor-compressor units for processing a working fluid, and more particularly to an integrated motor-compressor having a cooling system.
  • a motor-compressor unit comprises a centrifugal compressor and a motor integrated in a common housing.
  • a centrifugal compressor with multiple compression stages generally comprises a plurality of impellers supported by a driven shaft coupled to a rotor driven by a motor or a turbine in order to generate a flow of compressed process gas.
  • the shaft used to directly drive such a centrifugal compressor is required to rotate at relatively high speeds which generate heat. Furthermore, operating the motor-compressor at high speeds increases windage frictional losses resulting from components operating in pressurized gas.
  • a cooling circuit which may be an open loop cooling circuit or a quasi-closed loop cooling circuit where gas is drawn from the process stream at some point in the compression process. The process gas is then circulated through the motor and the bearings to absorb heat.
  • the cooling gas may be driven by a pressure difference between the source of the cooling gas and the place where the gas is allowed to flow to.
  • One benefit afforded by embodiments of the integrated motor-compressor unit described herein is to reduce windage losses.
  • windage losses may be high, especially for compressors with high suction pressure.
  • depressurization system for an integrated motor-compressor unit having a motor and a compressor coupled to said motor.
  • the depressurization system is configured to depressurize the pressure of the motor.
  • an integrated motor-compressor unit configured to process a working fluid, such as for example gas, and comprising a motor and a compressor coupled to said motor via a rotatable shaft and mounted in a single common housing, a cooling fluid is circulated throughout said housing in a cooling circuit.
  • a working fluid such as for example gas
  • the integrated motor-compressor unit comprises a depressurization system configured to depressurize the pressure of the motor.
  • the depressurization system is thus configured to reduce pressure of the cooling fluid circulating in the cooling circuit.
  • Such a depressurization system creates a significant pressure drop of at least 10 bars.
  • the efficiency of the motor is thus significantly increased.
  • the depressurization system comprises an expansion device, for example before the cooling circuit, and an auxiliary compressor, for example, after the cooling circuit, configured to recover the suction pressure.
  • the expansion device may be, for example, a cooling expansion valve configured to receive the working fluid via a main compressor suction inlet of the compressor and to transmit expanded cooled fluid to the cooling circuit, and the auxiliary compressor may be configured to receive the cooling fluid after having cooled notably the motor and/or the bearings and to compress the cooling fluid.
  • the expansion device is an expansion wheel.
  • the expansion wheel may be mounted in various suitable locations further described and claimed herein.
  • the motor rotates the shaft and thereby drives the compressor.
  • a process gas to be compressed is introduced via a main compressor suction inlet provided in the housing.
  • the compressor then compresses the process gas through successive stages of impellers to thereby produce a compressed process gas.
  • the compressed process gas then exits the compressor via a process discharge outlet provided in the housing.
  • FIG. 1 very schematically represents an integrated motor-compressor unit according to a first embodiment of the invention
  • FIG. 2 very schematically represents an integrated motor-compressor unit according to a second embodiment of the invention
  • FIG. 3 very schematically represents an integrated motor-compressor unit according to a third embodiment of the invention.
  • FIG. 4 very schematically represents an integrated motor-compressor unit according to a fourth embodiment of the invention.
  • the Figures very schematically illustrate an integrated motor-compressor unit 10 configured to process a working fluid, such as gas.
  • the integrated motor-compressor unit 10 comprises a motor 12 and a compressor 14 coupled to said motor 12 via a rotatable shaft 16 and mounted in a single common housing 18 configured to circulate a cooling fluid in a cooling circuit 27 .
  • the integrated motor-compressor unit 10 further comprises a depressurization system 30 configured to depressurize the pressure of the motor 12 and thus configured to reduce pressure of the cooling circulating in the cooling circuit.
  • Such a depressurization system 30 creates a significant pressure drop of at least 10 bars.
  • the efficiency of the motor 12 is thus significantly increased thanks to such pressure drop.
  • the shaft extends substantially the whole length of the housing 18 and comprises a motor section 17 coupled to the motor 12 and a driven section 19 coupled to the compressor 14 .
  • the motor section 17 and the driven section 19 of the rotatable shaft 16 are connected via a coupling 20 , such as for example a flexible or rigid coupling.
  • the motor section 17 and the driven section 19 are supported at each end, respectively, by one or more radial bearings 22 .
  • radial bearings 22 As way of a non-limitative example, four sets of radial bearings 22 are shown.
  • the bearings 22 may be directly or indirectly supported by the housing 18 .
  • the motor 12 may be an electric motor, such as a permanent magnet motor having permanent magnets mounted on the rotor (not depicted on the figures) and a stator (not depicted on the figures).
  • a permanent magnet motor having permanent magnets mounted on the rotor (not depicted on the figures) and a stator (not depicted on the figures).
  • other types of electric motors such as for example synchronous, induction, brushed DC motors, etc. . . . may be used.
  • the compressor 14 may be a multi-stage centrifugal compressor with one or more compressor stage impellers (not shown).
  • a cooling gas is circulated throughout the housing 18 in the cooling circuit 27 having cooling conducts 28 and hot conducts 29 .
  • the depressurization system 30 comprises an expansion device 32 before the cooling circuit 27 and an auxiliary compressor 34 after the cooling circuit 27 configured to recover the suction pressure.
  • FIG. 1 A first embodiment of the depressurization system 30 is shown on FIG. 1 .
  • the expansion device 32 is a cooling expansion valve receiving process gas via the main compressor suction inlet 24 and transmitting expanded cooled process gas to the cooling circuit 27 .
  • the auxiliary compressor 34 receives the cooling fluid after having cooled the bearings 22 and the motor 12 and compresses it before transmitting to the main compressor suction inlet 24 .
  • the expansion device 32 is an expansion wheel mounted on the motor shaft end.
  • the expansion wheel may be mounted on the compressor shaft end, between bearings or on a dedicated turbo-expander.
  • the auxiliary compressor 34 is, in this embodiment, mounted on the compressor shaft end.
  • the auxiliary compressor 34 may be mounted on the motor shaft end, between bearings, on a dedicated turbo-expander, or on a dedicated compressor.
  • FIG. 3 differs from the embodiment of FIG. 1 by the structure of the expansion device 32 .
  • the expansion is created by voluntary compressor 14 leakages that are compressed by the auxiliary compressor 34 .
  • calibrated gas leakages on the compressor end 14 are used to generate the cooling flow.
  • the auxiliary compressor 34 is mounted on the motor shaft end.
  • the depressurization system 30 comprises a blower device 36 mounted upstream the compressor 14 and configured to circulate the cooling fluid in a closed loop cooling circuit 27 .
  • the depressurization system 30 further comprises a depressurization auxiliary compressor 34 configured to compensate for the main compressor gas leakages.
  • the depressurization system 30 also comprises a cooler 38 mounted on the cooling circuit 27 after the blower device 36 .
  • the depressurization auxiliary compressor 34 may be a low pressure compressor or a dedicated equipment.
  • the motor 12 rotates the shaft 16 and thereby drives the compressor 14 .
  • a process gas to be compressed is introduced via a main compressor suction inlet 24 provided in the housing 18 .
  • the compressor 14 then compresses the process gas through successive stages of impellers to thereby produce a compressed process gas.
  • the compressed process gas then exits the compressor 14 via a process discharge outlet 26 provided in the housing 18 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US17/753,929 2019-09-23 2019-09-23 Integrated motor-compressor unit having a cooling circuit and a depressurization system configured to reduce pressure of the cooling fluid Pending US20220372994A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2019/058026 WO2021058995A1 (en) 2019-09-23 2019-09-23 Integrated motor-compressor unit having a cooling circuit and a depressurization system configured to reduce pressure of the cooling fluid

Publications (1)

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US20220372994A1 true US20220372994A1 (en) 2022-11-24

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US17/753,929 Pending US20220372994A1 (en) 2019-09-23 2019-09-23 Integrated motor-compressor unit having a cooling circuit and a depressurization system configured to reduce pressure of the cooling fluid

Country Status (7)

Country Link
US (1) US20220372994A1 (pt)
EP (1) EP4034768B1 (pt)
JP (1) JP7391196B2 (pt)
CN (1) CN114641618B (pt)
BR (1) BR112022005399A2 (pt)
CA (1) CA3151299A1 (pt)
WO (1) WO2021058995A1 (pt)

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100421390B1 (ko) * 2001-11-20 2004-03-09 엘지전자 주식회사 터보 압축기 냉각장치
US20070036662A1 (en) * 2005-08-05 2007-02-15 C.R.F Societa Consortilla Per Azioni Multistage motor-compressor for the compression of a fluid
US7508101B2 (en) * 2006-02-24 2009-03-24 General Electric Company Methods and apparatus for using an electrical machine to transport fluids through a pipeline
US20070271956A1 (en) * 2006-05-23 2007-11-29 Johnson Controls Technology Company System and method for reducing windage losses in compressor motors
JP4981557B2 (ja) * 2007-07-13 2012-07-25 三菱重工業株式会社 ターボ圧縮機およびターボ冷凍機
US8147178B2 (en) * 2008-12-23 2012-04-03 General Electric Company Centrifugal compressor forward thrust and turbine cooling apparatus
US9200643B2 (en) 2010-10-27 2015-12-01 Dresser-Rand Company Method and system for cooling a motor-compressor with a closed-loop cooling circuit
TWI577949B (zh) * 2013-02-21 2017-04-11 強生控制科技公司 潤滑及冷卻系統
JP6011571B2 (ja) * 2014-03-19 2016-10-19 株式会社豊田自動織機 電動ターボ式圧縮機
ITUB20152564A1 (it) * 2015-07-28 2017-01-28 Nuovo Pignone Tecnologie Srl Motocompressore e metodo per migliorare l’efficienza di un motocompressore
US20170174049A1 (en) * 2015-12-21 2017-06-22 Ford Global Technologies, Llc Dynamically controlled vapor compression cooling system with centrifugal compressor
CN207864270U (zh) * 2017-10-12 2018-09-14 江苏神运电气有限公司 一种干式变压器用多功能冷却风机

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Publication number Publication date
EP4034768B1 (en) 2024-05-01
BR112022005399A2 (pt) 2022-06-21
JP7391196B2 (ja) 2023-12-04
CN114641618A (zh) 2022-06-17
JP2022548391A (ja) 2022-11-18
CN114641618B (zh) 2024-02-23
WO2021058995A1 (en) 2021-04-01
CA3151299A1 (en) 2021-04-01
EP4034768A1 (en) 2022-08-03

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