EP4288665A1 - Compresseur, en particulier compresseur frigorifique, machine de froid, et procédé de fabrication d'un compresseur - Google Patents

Compresseur, en particulier compresseur frigorifique, machine de froid, et procédé de fabrication d'un compresseur

Info

Publication number
EP4288665A1
EP4288665A1 EP22703383.4A EP22703383A EP4288665A1 EP 4288665 A1 EP4288665 A1 EP 4288665A1 EP 22703383 A EP22703383 A EP 22703383A EP 4288665 A1 EP4288665 A1 EP 4288665A1
Authority
EP
European Patent Office
Prior art keywords
compressor
lubricant
fluid
return channel
pressure area
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
EP22703383.4A
Other languages
German (de)
English (en)
Inventor
Sören GELKE
Sebastian Krause
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.)
ThyssenKrupp AG
Thyssenkrupp Dynamic Components GmbH
Original Assignee
ThyssenKrupp AG
Thyssenkrupp Dynamic Components GmbH
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 ThyssenKrupp AG, Thyssenkrupp Dynamic Components GmbH filed Critical ThyssenKrupp AG
Publication of EP4288665A1 publication Critical patent/EP4288665A1/fr
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B31/00—Compressor arrangements
    • F25B31/002—Lubrication
    • F25B31/004—Lubrication oil recirculating arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/04—Measures to avoid lubricant contaminating the pumped fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/02—Lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/02—Lubrication
    • F04B39/0207—Lubrication with lubrication control systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/16—Filtration; Moisture separation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/1077—Flow resistance valves, e.g. without moving parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
    • F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
    • F25B9/008—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant being carbon dioxide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/23—Separators

Definitions

  • Compressors in particular refrigerant compressors, refrigeration machines, and methods for producing a compressor
  • the present invention relates to a compressor according to the preamble of claim 1, a refrigerating machine according to the preamble of claim 10, and a method for producing a compressor according to the preamble of claim 11.
  • a compressor also called a compressor, is a machine, in particular a fluid energy machine, which supplies mechanical work to an enclosed gas.
  • Compressors are typically used to compress gases. They preferentially increase the pressure and density of the gas.
  • the compressor or the moving components of the compressor are usually lubricated with a lubricant such as oil.
  • a lubricant such as oil.
  • Mixing, in particular as an aerosol, of the fluid to be compressed and the lubricant is usually unavoidable.
  • the atomization of the lubricant can be caused, for example, by components moved by the lubricant (eccentrics/connecting rods, etc.).
  • the lubricant is distributed as a fluid/lubricant aerosol in the fluid circuit, in particular in the high-pressure area HD and in the low-pressure area ND, and is no longer available, for example, for lubricating compressor components.
  • the lubricant reservoir may become exhausted.
  • a compressor has become known, for example from DE102015224071, which comprises a lubrication system for lubricating components of the compressor with a lubricant.
  • the compressor has a low-pressure area, in particular in the form of an engine room, and a high-pressure area with a compressor outlet.
  • the lubricant comes into contact with the fluid in the low-pressure area, so that a fluid mixture of fluid and lubricant is formed.
  • the compressor includes the compressor a compression device for compressing the fluid mixture.
  • the compressor includes a lubricant return which fluidly connects the HP with the LP area and enables a lubricant return.
  • the lubricant return thus represents a kind of bypass of the compressor unit or the piston arrangement.
  • a first lubricant return is arranged in the high-pressure area and the second lubricant return in the low-pressure area.
  • Both lubricant returns are fluidly connected to one another in a controllable manner by means of a valve arrangement.
  • the valve arrangement thus regulates the separation/connection of the high-pressure and low-pressure areas of the compressor.
  • the valve arrangement can automatically adjust a flow cross section at least as a function of a flow force. The flow force is created by the fluid mixture flowing through the valve assembly.
  • a particular disadvantage of this solution for returning lubricant from the high-pressure area to the low-pressure area is that many moving parts are used, so that high wear and tear but also high production costs are to be expected. Furthermore, the valve arrangement must be adjusted, which in turn can lead to uncertainties during operation. There is also the risk of the valve arrangement becoming clogged, with the result that in fact there is no longer any return of lubricant. Also, an uncontrolled loss of pressure across the valve assembly can occur, so that a lot of fluid would flow back through the valve.
  • the lubricant return channel includes a fluid diode, a regulated or switched valve, possibly a sensor system for determining the fluid in front of the valve and the required electronic control, can be dispensed with.
  • a regulated or switched valve possibly a sensor system for determining the fluid in front of the valve and the required electronic control
  • With an advantageous structural design hardly any fluid is allowed to pass through from the high-pressure area to the low-pressure area, but mainly lubricant. A risk of clogging by particles is reduced by an open geometry. In principle, there is also no need to adjust the fluid diode.
  • the blocking behavior is preferably determined structurally by means of the length and/or the geometry of the throttle point, ie the fluid diode.
  • the lubricant return channel has a heart-shaped or offset heart-shaped inner wall to form a fluid diode.
  • Such a structure is advantageously suitable for designing a fluid diode, in particular with the properties outlined above.
  • the lubricant return channel is introduced into a metal sheet.
  • the plate can be integrated into the compressor in a simple manner, for example as an intermediate plate in the housing of the compressor.
  • the lubricant return channel is designed in the shape of a semicircle. In this way, for example, integration can take place in a simple manner in a circular-cylindrical housing, with the inlet and outlet of the lubricant return channel being offset by 180°, for example, in the circumferential direction.
  • the lubricant return channel is formed in a flat parting surface in a housing, a sealing surface and/or in a seal of the compressor. In this way, the lubricant return channel can advantageously be integrated into the compressor housing.
  • the fluid is a refrigerant, in particular supercritical CO2.
  • the lubricant is oil.
  • the channel geometry that is decisive for the fluid diode, in particular the design of the inner wall of the lubricant return channel is produced by stamping, etching or eroding.
  • the aforementioned measures represent advantageous manufacturing processes for the design of the lubricant return channel.
  • the lubricant return channel has a fluid diode as a separate component and/or the lubricant return channel is configured as a fluid diode at least in sections.
  • Another object of the present invention is to propose an improved refrigerator.
  • this object is achieved by a refrigerating machine having the characterizing features of claim 10 .
  • the advantages of the compressor according to the invention can be utilized for a refrigerating machine, for example an air conditioning system in a motor vehicle.
  • Another object of the present invention is to propose an advantageous method for manufacturing a compressor according to the invention.
  • this object is achieved by a method for producing a compressor with the characterizing features of claim 11.
  • the channel geometry that is decisive for the fluid diode in particular the configuration of the inner wall of the lubricant return channel, has been produced by stamping, etching or eroding, a method that is simple in terms of production technology can be proposed.
  • FIG. 1 shows a schematic representation of a refrigerating machine with a compressor according to the invention
  • 3a shows an exemplary surface structure of a fluid diode of a compressor according to the invention with an indicated movement profile of the fluid
  • 3b shows an exemplary surface structure of a fluid diode of a compressor according to the invention with an indicated movement profile of the lubricant
  • FIG. 4 shows a housing component of a compressor according to the invention with a milled fluid diode
  • Fig. 5 shows a detail "X" according to Fig. 4.
  • FIG. 6 shows part of a housing for a compressor according to the invention
  • FIG. 7 shows a compressor according to the invention in a sectional schematic representation.
  • a compressor V according to the invention is, for example, part of a refrigeration machine, such as an air conditioning system.
  • a refrigeration machine such as an air conditioning system.
  • such a refrigeration machine usually includes a gas cooler G, an expansion valve E and an evaporator D.
  • the aforementioned components are fluidically connected to one another, i.e. a fluid F, such as preferably a cooling fluid, is compressed in the compressor V, passes through the High-pressure outlet 22 of the compressor V into the gas cooler G and from the gas cooler G to the expansion valve E and from there into the evaporator D. From the evaporator D, the fluid is again introduced via the low-pressure inlet 12 of the compressor V.
  • a refrigerating machine is sufficiently known to the person skilled in the art, so that no further explanation is required here.
  • the compressor V can be, for example, a piston compressor, in particular an axial piston compressor, radial piston compressor or scroll compressor.
  • the compressor has a low-pressure area 1 and a high-pressure area 2 .
  • a lubricant S such as oil, is used to lubricate the moving components of the low-pressure area 1 .
  • the low-pressure area 1 of the compressor V includes, for example, a low-pressure inlet 12 for the fluid or refrigerant to be fed into the compressor.
  • the compressor V also includes, in particular, a driving electric machine 5 or a shaft for connecting an external drive.
  • the compressor shown by way of example in FIG. 7 comprises two housing parts 41, 42.
  • a cylinder housing 16 forms cylinders in which pistons 14 are movably arranged. These pistons 14 can be driven by an eccentric shaft.
  • the cylinders and thus also the pistons 14 that can be moved therein run radially or are arranged radially with respect to the eccentric shaft.
  • a cover with an inlet valve 13, the pistons 14 and the cylinders form the working chamber 17 and the compression chamber.
  • the condensed or compressed fluid can contain lubricant S, which can be separated, for example, at edges or when there is a change in the direction of flow of the fluid. This usually also takes place in a lubricant separator 21 .
  • the lubricant separator 21 does not have to be a separate component. Rather, any geometry in which lubricant can be separated, for example, at edges or deflections, in particular geometries for flow deflection or changing the flow speed, etc., can be used as a lubricant separator 21.
  • the separated lubricant S then collects in the channel 24.
  • the compressed fluid can be routed out of the compressor to the other components of the refrigeration circuit via a high-pressure connection 22 .
  • a lubricant separator 21 is preferably connected upstream of the high-pressure connection 22, so that the fluid can be routed out of the compressor via the lubricant separator 21 and the high-pressure outlet.
  • at least one lubricant return channel 3 is provided.
  • Such a lubricant return channel 3 can be designed as a fluid diode 31 or have such a fluid diode 31 as a separate component, as indicated in FIG. 7 .
  • a plurality of fluid diodes 31 can also be arranged in a lubricant return channel 3 in order to achieve the desired properties.
  • a lubricant return channel 3 can also be formed between two housing parts of the compressor V, for example in a seal.
  • Such a seal 32 is arranged or formed, for example, between a part of the compressor housing 42 and the cylinder housing 16, as shown in FIGS.
  • the geometry of the fluid diode is formed in the seal 32, for example. In the installed state, the seal 32 forms the lubricant return channel 3 with the adjacent components, such as the housing part 42 and the cylinder housing 16 .
  • the low-pressure area 1 can be equipped with a lubricant reservoir 11 .
  • a lubricant separator 21 can be provided in order to separate the lubricant S from the fluid-lubricant mixture.
  • lubricant S in the compressor V can be separated at every deflection or change in cross section of the fluid-lubricant mixture.
  • a lubricant return channel 3 is provided between the high-pressure area 2, in particular the lubricant separator 3 in the high-pressure area, and the low-pressure area 1, in particular the lubricant reservoir 11 in the low-pressure area.
  • the compressor V can be equipped with a compressor housing 4 for accommodating or forming the aforementioned components.
  • the lubricant return channel 3 includes a fluid diode 31 .
  • the fluid diode 31 comprises a geometry that offers a medium flowing through resistance to flow that varies depending on the direction.
  • a fluid diode has also become known under the name Tesla valve.
  • the lubricant return channel 3 is designed, at least in sections, to be media-selective or as a media-selective throttle, i.e.
  • the, in particular gaseous, fluid F preferably refrigerant
  • the, in particular liquid, lubricant S Different flow resistances act when passing through the lubricant return channel 3 from the high-pressure area 2 to the low-pressure area 1 .
  • the fluid F is preferably a refrigerant, such as supercritical CO2.
  • the lubricant S which is present in liquid form downstream of the separator 3 in particular, experiences a lower flow resistance when passing through the fluid diode 31 .
  • FIGS. 2, 3a and 3b Examples of fluid diodes and flow patterns are shown in FIGS. 2, 3a and 3b.
  • the fluid diode 31 or the section of the lubricant return channel 3 designed as a fluid diode can be characterized in particular by the following details.
  • a lubricant return channel 3 is introduced, for example, into a metal sheet.
  • the flow guidance takes place in particular with a non-constant cross-section and preferably has a repetitive basic contour along an arbitrary development curve.
  • the fluid F, in particular the refrigerant, and the lubricant S are thus forced into a meandering main flow with circulating secondary flows.
  • the lubricant return channel 3 has a similar geometry to the "Tesla valve” or fluid diode and is operated here in the "blocking direction", so to speak, resulting in a particularly high resistance in the direction of flow from the high-pressure area 2 to the low-pressure area 1 .
  • differences in the material properties are exploited.
  • the material properties or the different physical properties can be, for example, density, viscosity or compressibility. With a given pressure drop, these different physical properties result in different flow properties such as flow velocity and degree of turbulence for the respective medium.
  • the gaseous fluid F in particular the refrigerant, is strongly deflected in the fluid diode 31, it goes more strongly into the "contour corners" of the section of the lubricant return channel 3 designed as a fluid diode 31.
  • the kinetic energy of the fluid F, in particular the gaseous fluid is partially dissipated during the deflection. In particular, the degree of turbulence in gas flow is greater, resulting in greater flow resistance.
  • the gaseous fluid F has a high speed, which is due in particular to its density. An expanding gas has significantly higher flow velocities.
  • the lubricant S present in a liquid state is not deflected as much as the fluid F present in gaseous form, in particular the refrigerant present in gaseous form.
  • the fluid diode 31, in particular the contour of the fluid diode, can almost constant speed and a lower degree of turbulence. The flow resistance acting here is therefore lower.
  • a heart-shaped structure particularly preferably an offset heart-shaped structure
  • other shapes of the contour are conceivable and known in principle from “fluid diodes”.
  • the length of the lubricant return channel 3 is preferably a matter of individual design. In principle, any number of such units can be connected in series.
  • the lubricant return channel 3 as such can be designed in various geometries, in particular as a semicircle (cf., for example, FIGS. 4 and 5).
  • the lubricant return channel 3, in particular the part designed as a fluid diode 31, can also be designed as a fold or other arrangement, in particular due to the respective space conditions in the compressor.
  • the lubricant return channel 3 is preferably formed in planar dividing surfaces in the housing, a sealing surface and/or in a seal 32 of the compressor V. Such a configuration is structurally simple to integrate in the compressor and requires less installation space. Such a configuration is shown in particular in FIG.
  • the channel geometry that is decisive for the fluid diode, in particular the configuration of the inner wall, can be produced in planar parting surfaces by stamping, etching or eroding.
  • the number of repetitions of the basic contour of the inner wall of the lubricant return channel 3, in particular of the fluid diode 31, and the height of the contour or the sheet metal thickness can be adapted to the requirements of the respective throttling task.
  • a refrigerant for example, can be considered as the fluid to be compressed.
  • the compressor can preferably be designed as a refrigerant compressor.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Compressor (AREA)

Abstract

L'invention concerne un compresseur (V), en particulier un compresseur frigorifique, comprenant une zone basse pression (1) et une zone haute pression (2), un lubrifiant (S) se trouvant dans la zone basse pression (1) pour assurer la lubrification du compresseur, un fluide (F) étant refoulé de la zone basse pression (1) jusque dans la zone haute pression et étant comprimé, une partie du lubrifiant (S) parvenant conjointement avec le fluide (F), de la zone basse pression (1) jusque dans la zone haute pression (2), un séparateur de lubrifiant (21) destiné à séparer le lubrifiant (S) du mélange fluide-lubrifiant se trouvant dans la zone haute pression (2), un canal de retour de lubrifiant (3) destiné à transporter le lubrifiant (S) séparé, de la zone haute pression (2) jusque dans la zone à basse pression (1) étant présent, le canal de retour de lubrifiant (3) comprenant une diode à fluide (31). L'invention concerne une machine de froid comprenant un compresseur (V), un refroidisseur de gaz (G), une soupape d'expansion (E) et un évaporateur (D) qui sont reliés mutuellement de manière fluidique, la machine de froid se caractérisant par un compresseur (V) selon au moins une des revendications précédentes, ainsi qu'un procédé de fabrication d'un compresseur (V) selon au moins une des revendications précédentes, la géométrie du canal déterminante pour la diode de fluide (31), en particulier la configuration de la paroi intérieure du canal de retour de lubrifiant (3), étant réalisée par estampage, gravure ou érosion.
EP22703383.4A 2021-02-05 2022-02-02 Compresseur, en particulier compresseur frigorifique, machine de froid, et procédé de fabrication d'un compresseur Pending EP4288665A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021201091.1A DE102021201091A1 (de) 2021-02-05 2021-02-05 Verdichter, insbesondere Kältemittelverdichter, Kältemaschine, sowie Verfahren zur Herstellung eines Verdichters
PCT/EP2022/052513 WO2022167502A1 (fr) 2021-02-05 2022-02-02 Compresseur, en particulier compresseur frigorifique, machine de froid, et procédé de fabrication d'un compresseur

Publications (1)

Publication Number Publication Date
EP4288665A1 true EP4288665A1 (fr) 2023-12-13

Family

ID=80445518

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22703383.4A Pending EP4288665A1 (fr) 2021-02-05 2022-02-02 Compresseur, en particulier compresseur frigorifique, machine de froid, et procédé de fabrication d'un compresseur

Country Status (5)

Country Link
US (1) US20240110734A1 (fr)
EP (1) EP4288665A1 (fr)
CN (1) CN117242262A (fr)
DE (1) DE102021201091A1 (fr)
WO (1) WO2022167502A1 (fr)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1329559A (en) 1916-02-21 1920-02-03 Tesla Nikola Valvular conduit
JPH0122955Y2 (fr) * 1980-04-17 1989-07-12
JPH0735076A (ja) * 1993-07-22 1995-02-03 Toshiba Corp 横形ロータリ式圧縮機
JP2950809B1 (ja) 1998-05-07 1999-09-20 エルジー電子株式会社 リニア圧縮機のオイル供給装置
KR100390492B1 (ko) * 2000-07-13 2003-07-04 엘지전자 주식회사 압축기용 흡입소음기의 소음 저감장치
JP4013552B2 (ja) * 2002-01-07 2007-11-28 株式会社日立製作所 密閉形圧縮機
DE102015224071A1 (de) 2015-12-02 2017-06-08 Volkswagen Aktiengesellschaft Fluidverdichter
JP6947742B2 (ja) 2016-03-03 2021-10-13 デイコ アイピー ホールディングス, エルエルシーDayco Ip Holdings, Llc 流体ダイオードチェックバルブ
US11596885B2 (en) * 2019-05-07 2023-03-07 Bendix Commercial Vehicle Systems Llc Oil sequestering spin-on cartridge

Also Published As

Publication number Publication date
CN117242262A (zh) 2023-12-15
DE102021201091A1 (de) 2022-08-11
WO2022167502A1 (fr) 2022-08-11
US20240110734A1 (en) 2024-04-04

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