WO2024003570A1 - Compresseur électrique - Google Patents

Compresseur électrique Download PDF

Info

Publication number
WO2024003570A1
WO2024003570A1 PCT/GB2023/051717 GB2023051717W WO2024003570A1 WO 2024003570 A1 WO2024003570 A1 WO 2024003570A1 GB 2023051717 W GB2023051717 W GB 2023051717W WO 2024003570 A1 WO2024003570 A1 WO 2024003570A1
Authority
WO
WIPO (PCT)
Prior art keywords
stage
compressor
electric motor
thrust bearing
inlet
Prior art date
Application number
PCT/GB2023/051717
Other languages
English (en)
Inventor
Luke Read
Original Assignee
Aeristech Limited
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 Aeristech Limited filed Critical Aeristech Limited
Publication of WO2024003570A1 publication Critical patent/WO2024003570A1/fr

Links

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
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • F04D17/10—Centrifugal pumps for compressing or evacuating
    • F04D17/105—Centrifugal pumps for compressing or evacuating with double suction
    • 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
    • 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
    • F04D29/051—Axial thrust balancing
    • F04D29/0513—Axial thrust balancing hydrostatic; hydrodynamic thrust bearings

Definitions

  • This invention relates to an improved electrical compressor, in particular to an improved electrical compressor with a thrust bearing.
  • the present invention has been devised with the foregoing in mind and aims to at least ameliorate the above mentioned issues.
  • a compressor directly connected to an electric motor comprising: a first stage connected to an electric motor, said first stage comprising a first stage inlet drawing air into the compressor over the electric motor; a second stage positioned adjacent to and opposite the first stage such that a second stage inlet draws air in an opposite direction to the first stage inlet; and a thrust bearing positioned between the first stage and the second stage.
  • an airflow path between the first stage inlet and the thrust bearing may comprise an airflow path and wherein no other thrust bearings are provided in the airflow path.
  • the airflow path may comprise a clearance distance between an impeller blade of the first stage, said clearance distance.
  • the thrust bearing may comprise a thrust disc and a seal. By combining both a seal and a thrust disc at a single location the overall loss due to air leakage and winding losses may be reduced.
  • the first stage may be directly coupled to the electric motor, such that the compressor is mounted in position substantially by the thrust bearing.
  • This allows for the tolerances between the compressor stages and the shroud or casing of the compressor can be more easily and tightly managed.
  • the proposed design looks to use a two stage compressor design where the first stage inlet is facing the electric motor.
  • the second stage is positioned back to back with first stage where the inlet is in opposite direction to that of the first stage.
  • a thrust bearing is then positioned between the two stages.
  • the inlet for the first stage is typically drawn over the motor.
  • the thrust disc is positioned between the two compressor stages it substantially does not inhibit the flow to the first stage inlet.
  • a contact seal is used between the two compressor stages - having an additional thrust bearing creates additional loss. By combining the two, this can reduce the overall losses.
  • the thrust bearing being locating between both compressor wheels also reduces the tolerance stack up between the wheels and the shrouds allowing for tighter control of the tip gap, this is important for the efficiency of the high pressure ratio low flow type machines.
  • Compressors are typically centrifugal compressors that operate at high speeds typically 10,000 rpm - 160,000 rpm.
  • a 6kW oil-free compressor model may deliver a pressure ratio of 1.9 at 160,000 RPM and weigh less than 4kg.
  • This high-speed motor and compact design can offer a power-dense solution.
  • a 10kW oil-free compressor may provide a pressure ratio of 2.5 at 115,000 RPM, weigh 5.4kg, and may be configured to accept a wide range of input voltages (260-700V), allowing direct power in fuel cell applications without needing a separate DC/DC converter.
  • a 25kW oil-free compressor typically features a pressure ratio of 3.0 at 95,000 RPM and weighs less than 10kg, providing a compact solution for higher power, continuous operation.
  • Figure 1 shows a cross-sectional view of a compressor and electric motor according to an existing design
  • Figure 2a shows a cross-sectional view of a compressor and electric motor according to an embodiment of the present invention
  • Figure 2b shows a close-up view of a portion of Figure 2a
  • Figure 2c shows a close up view of a portion of Figure 2a.
  • Figure 1 shows a cross-section of an electric motor and compressor according to existing designs.
  • the compressor cover and diffuser have been omitted from the image for simplicity.
  • the figure shows a two stage compressor 10, a first stage 14 and a second stage 12.
  • the stages are driven by an electric motor 30.
  • the two stages are positioned in series and separated by a seal 18 that acts to reduce air leakage between the first stage and the second stage.
  • the seal 18 can produce windage losses between the two stages due to the imprecise seating that typically occurs.
  • Air is drawn into the first stage 14 via the first stage inlet 40.
  • a thrust bearing 20 is provided before the first stage 14 to mount the compressor 10. The position of the thrust bearing 20 inhibits the flow of air into the compressor and can cause a reduction in efficiency due to the narrowing in the compressor air inlet passage 42 as it passes the shoulder 42a of the thrust bearing 20. There are also windage losses due to this configuration.
  • Figure 2a shows a corresponding cross-section according to the present invention.
  • the design uses a two-stage compressor design 100.
  • the compressor comprises a two-stage compressor 112, 114, with an inlet 140 for the first stage 114 that (directly) faces an electric motor 130.
  • the second stage 112 is positioned back to back with the first stage 114, and the second stage inlet is in an opposite direction to that of the first stage inlet.
  • a thrust bearing 120 is positioned between the two stages.
  • the thrust bearing 120 is described in greater detail with respect to Figure 2b.
  • the bearing 120 comprises a bearing or thrust disc 122, with a contact seal 124.
  • the inlet 140 for the first stage is drawn over the motor 130.
  • a contact seal 124 is used between the two compressor stages - having an additional thrust bearing creates additional loss, which is now omitted, leading to better air flow as shown in Figure 2c.
  • the thrust bearing being locating between both compressor wheels also reduces the tolerance stack up between the wheels and the shrouds of the compressor, allowing for tighter control of the tip gap 118 of the compressor, this is very important for the efficiency of the high pressure ratio low flow type machines.
  • the efficiency of the compressor is improved, particularly for high speed compressors (50,000 rpm+).
  • Figure 2c shows how the airflow inlet between to the first stage inlet has a larger minimum distance 160 between the casing of the electric motor.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

L'invention concerne un compresseur relié directement à un moteur électrique. Le compresseur comprenant : un premier étage (114) relié à un moteur électrique, ledit premier étage comprenant une entrée de premier étage aspirant de l'air dans le compresseur sur le moteur électrique ; un second étage (112) positionné adjacent au premier étage et à l'opposé de celui-ci de telle sorte qu'une entrée de second étage aspire de l'air dans une direction opposée à l'entrée de premier étage ; et un palier de butée (122) positionné entre le premier étage et le second étage.
PCT/GB2023/051717 2022-06-29 2023-06-29 Compresseur électrique WO2024003570A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB2209595.4 2022-06-29
GBGB2209595.4A GB202209595D0 (en) 2022-06-29 2022-06-29 Thrust bearing

Publications (1)

Publication Number Publication Date
WO2024003570A1 true WO2024003570A1 (fr) 2024-01-04

Family

ID=82705510

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2023/051717 WO2024003570A1 (fr) 2022-06-29 2023-06-29 Compresseur électrique

Country Status (2)

Country Link
GB (1) GB202209595D0 (fr)
WO (1) WO2024003570A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104675510A (zh) * 2014-12-17 2015-06-03 北京航空航天大学 一种低气动惯性的快速响应高空两级涡轮增压器
WO2016017877A1 (fr) * 2014-08-01 2016-02-04 주식회사 부강테크 Turbosoufflante variable à étages multiples
JP2017025824A (ja) * 2015-07-23 2017-02-02 株式会社豊田自動織機 遠心圧縮機

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016017877A1 (fr) * 2014-08-01 2016-02-04 주식회사 부강테크 Turbosoufflante variable à étages multiples
CN104675510A (zh) * 2014-12-17 2015-06-03 北京航空航天大学 一种低气动惯性的快速响应高空两级涡轮增压器
JP2017025824A (ja) * 2015-07-23 2017-02-02 株式会社豊田自動織機 遠心圧縮機

Also Published As

Publication number Publication date
GB202209595D0 (en) 2022-08-10

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