EP3081817A1 - Machine comprising a compressor or a pump - Google Patents

Machine comprising a compressor or a pump Download PDF

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Publication number
EP3081817A1
EP3081817A1 EP15163421.9A EP15163421A EP3081817A1 EP 3081817 A1 EP3081817 A1 EP 3081817A1 EP 15163421 A EP15163421 A EP 15163421A EP 3081817 A1 EP3081817 A1 EP 3081817A1
Authority
EP
European Patent Office
Prior art keywords
fluid
shaft
frame
machine according
housing
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
EP15163421.9A
Other languages
German (de)
French (fr)
Other versions
EP3081817B1 (en
Inventor
Rexhep Gashi
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.)
Belenos Clean Power Holding AG
Original Assignee
Belenos Clean Power Holding AG
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
Priority to HUE15163421A priority Critical patent/HUE053996T2/en
Priority to SI201531570T priority patent/SI3081817T1/en
Application filed by Belenos Clean Power Holding AG filed Critical Belenos Clean Power Holding AG
Priority to ES15163421T priority patent/ES2856014T3/en
Priority to PT151634219T priority patent/PT3081817T/en
Priority to PL15163421T priority patent/PL3081817T3/en
Priority to RS20210408A priority patent/RS61689B1/en
Priority to EP15163421.9A priority patent/EP3081817B1/en
Priority to CN201680021406.5A priority patent/CN107454927B/en
Priority to US15/565,791 priority patent/US10927844B2/en
Priority to JP2017553973A priority patent/JP6694895B2/en
Priority to PCT/EP2016/055828 priority patent/WO2016165906A1/en
Publication of EP3081817A1 publication Critical patent/EP3081817A1/en
Application granted granted Critical
Publication of EP3081817B1 publication Critical patent/EP3081817B1/en
Priority to HRP20210546TT priority patent/HRP20210546T1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/046—Bearings
    • F04D29/0467—Spherical bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal 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
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • F04D17/10—Centrifugal pumps for compressing or evacuating
    • 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
    • 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
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/046—Bearings
    • 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
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/046—Bearings
    • F04D29/049—Roller bearings
    • 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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
    • F04D29/056—Bearings
    • 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
    • F04D29/059—Roller bearings
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/16—Pumping installations or systems with storage reservoirs

Definitions

  • the present invention relates to a machine comprising a chassis enclosing at least one functional element and a control unit, and equipped with a fluid compressor, and more particularly a high-speed fluid compressor.
  • the fluid compressors equipping such machines are generally called turbochargers or centrifugal compressors. They are equipped with a stator and a rotor forming a permanent magnet synchronous motor (brushless motor). Compressors of this type can reach very high speeds, for example from 100,000 to 500,000 revolutions / minute. The motor drives the turbine at high speed, the turbine compressing the fluid.
  • the fluid can be air, water, a gas, a refrigerant or any other suitable fluid.
  • These compressors are used in many industrial, medical, pharmaceutical, food, automotive applications, particularly for the supply of compressed air, or refrigeration, heating or air conditioning applications, for the supply of compressed fluid.
  • compressors are generally used in very large installations, the compressor being far from the equipment requiring compressed fluid.
  • the compressed fluid is supplied by means of a supply circuit provided in the network.
  • this supply circuit is long, which entails risks of leakage of fluid along the circuit. Leaks in a compressed air circuit cause pressure losses, which generates very significant financial losses.
  • the network is kept under pressure at all times in order to be able to respond rapidly to the need of the equipment.
  • the continuous operation of the compressor represents a significant electrical energy consumption.
  • the motor shaft is rotatably mounted on a frame by means of two axial bearings.
  • These bearings may include ball bearings.
  • ball bearings it is difficult to obtain rotational speeds with such bearings because of the difference in speed between the balls and the rings.
  • the balls used are ceramic, the life of such bearings is limited to a hundred hours because of high rotational speeds.
  • Other types of bearing may be used, such as aerodynamic bearings.
  • this type of bearing has the disadvantage of moving transversely at the time of starting or during a change of speed, which creates friction at the level of the bearing elements.
  • the compressors are usually lubricated with a lubricant.
  • the disadvantage is that the lubricant may mix with the fluid, so that the compressed fluid is polluted by the lubricant.
  • impurities present in the central network may mingle with the compressed fluid. This is particularly dangerous, for example in the case of medical applications, such as dental applications, for which the compressed air arriving in the mouth must be healthy.
  • the invention particularly aims to overcome the various disadvantages of machines equipped with known high-speed compressors.
  • an object of the invention is to provide a machine comprising equipment requiring compressed fluid and having an independent operation.
  • Another object of the invention is to provide a machine comprising equipment requiring compressed fluid and which makes it possible to reduce the consumption of electrical energy and to limit leakage energy losses along the fluid circuit.
  • the invention also aims to provide a machine comprising a high-speed fluid compressor that does not require a lubricating agent and does not cause any pollution of the compressed fluid.
  • the present invention relates to a machine comprising a frame comprising at least one functional element and a control unit.
  • the machine according to the invention is particularly compact, reduces the length of the compressed fluid supply circuit so as to limit losses, and operates autonomously.
  • the first housing can be provided in the fluid supply channel.
  • said first housing can be provided in a first support element arranged centrally with respect to the axis of the shaft in the fluid supply channel, and held at the walls of said channel fluid supply by means of branches between which the fluid can flow.
  • the second housing can be provided in a second support element disposed in the frame centrally with respect to the axis of the shaft and opposite the first support element.
  • the second support element can be slidably mounted in the frame and be connected to said frame by elastic means arranged to absorb the play variations between the rotor and the stator.
  • the fluid compressor further comprises at least two aerodynamic bearings provided substantially on each side of the rotor shaft.
  • a first aerodynamic bearing can be provided upstream of the turbine, said first aerodynamic bearing being carried by a third support element arranged centrally with respect to the axis of the shaft in the channel of fluid supply, and maintained at the walls of said fluid supply channel by means of branches between which the fluid can flow.
  • a first aerodynamic bearing may be provided downstream of the turbine.
  • a second aerodynamic bearing may be provided at the end of the rotor shaft, on the opposite side to the fluid supply channel.
  • At least one of the first and second ends of the rotor shaft may comprise a third housing having the shape of a cap disposed centrally with respect to the axis of the shaft and arranged to receive said free mounted spherical element in said third housing.
  • the spherical element may be integral with at least one of the first and second ends of the rotor shaft.
  • the fluid supply circuit may comprise a compressed fluid reservoir and optionally a pressure multiplier provided between the fluid compressor and the compressed fluid reservoir.
  • control unit may comprise activation means of the fluid compressor arranged to activate said fluid compressor only if necessary by the functional element.
  • a high-speed fluid compressor 1 of the turbocharger or centrifugal compressor type.
  • the term "fluid compressor” generically refers to both a compressor used to increase the pressure of a gas and a pump used to increase the pressure of a liquid, by a mechanical process.
  • the fluid may be air, a gas, water vapor, water, a refrigerant or any other suitable fluid.
  • the compressor comprises a frame 2 in which are mounted a stator and a rotor, shown schematically under the references 4 and 5, respectively.
  • the stator 4 and the rotor 5 interact to form a permanent magnet synchronous motor (brushless motor).
  • the rotor 5 comprises a shaft 6 rotatably mounted on the frame 2 about an axis A by means of a first bearing 7 and a second bearing 8, the first bearing 7 being arranged to support the first axial end 9 of the shaft 6 and the second bearing 8 being arranged to support the second axial end 10 of the shaft 6.
  • the first and second bearings 7 and 8 will be described in detail below.
  • the shaft 6 carries a turbine 12 disposed on the side of the first axial end 9. It is of course possible to provide several turbines.
  • the compressor 1 also comprises a fluid supply channel 14 in the direction of the turbine 12, a body 15, as well as an outlet channel of compressed fluid 16, these elements being integral with the frame 2.
  • the first bearing 7 comprises a first spherical element 18 disposed at the first end 9 of the shaft 6, centrally relative to the axis A of the shaft 6 and a first housing 20 provided on the frame 2 having the shape of a cap disposed centrally relative to the axis A of the shaft 6 and arranged to support said first spherical element 18.
  • the second bearing 8 comprises a second spherical element 22 disposed at the second end 10 of the shaft 6, centrally with respect to the axis A of the shaft 6 and a second housing 24 provided on the frame 2 having the shape of a cap disposed centrally relative to the axis A of the shaft 6 and arranged to support said second spherical element 22.
  • the first housing 20 supporting the first spherical element 18 is provided in the fluid supply channel 14.
  • a first support element 26 having a truncated ovoid shape is disposed centrally with respect to the axis A of the shaft 6 in the fluid supply channel 14.
  • the first housing 20 has the shape of a cap, solid surface, made at the end of the first support member 26 which is directed inwardly.
  • the radius of the cap forming the first housing 20 is greater than the radius of the first spherical element 18.
  • the dimensions of the first housing 20 and the first spherical element 18 are such that said first spherical element 18 is in contact with the curved bottom of the first housing 20
  • the cap forming the first housing 20 and the first spherical element 18 are perfectly spherical in order to have a tangential contact between said first housing 20 and said first spherical element 18.
  • the first support element 26 is maintained at internal walls of said fluid supply channel 14 by means of three branches 28 (cf. Figure 1 ). These branches 28 are spaced apart from each other so as to allow the fluid to enter the compressor.
  • the first axial end 9 of the shaft 6 comprises a third housing 29 having the shape of a cap, with a solid surface, arranged centrally with respect to the axis A of the shaft 6 and arranged to receive the first spherical element 18 mounted free in said third housing 29.
  • the radius of the cap forming the third housing 29 is greater than the radius of the first spherical element 18.
  • the dimensions of the third housing 29 and the first spherical element 18 are such that said first spherical element 18 is in contact with the curved bottom of the third housing 29.
  • the first spherical element 18 is in the form of a ball mounted freely between the two caps forming the first and third housings 20, 29 between which the first spherical element 18 is maintained.
  • the cap forming the third housing 29 and the first spherical element 18 are perfectly spherical so as to have a tangential contact between said third housing 29 and said first spherical element 18.
  • the radius of the cap forming the third housing 29 can be equal to or different from the radius of the cap forming the first housing 20.
  • the second housing 24 supporting the second spherical element 22 is provided in a second support element 30 disposed in the frame 2 centrally with respect to the axis A of the shaft 6, and opposite the first element- 26.
  • the second housing 24 is formed in the second support element 30 in the form of a cap, with a solid surface, disposed facing the shaft 6.
  • the radius of the cap forming the second housing 24 is greater than the radius of the second spherical element 22.
  • the dimensions of the second housing 24 and the second spherical element 22 are such that said second spherical element 22 is in contact with the curved bottom of the second housing 24.
  • the cap forming the second housing 24 and the second spherical element 22 are perfectly spherical so as to have tangential contact between said second housing 24 and said second spherical element 22.
  • the second support element 30 is mounted so that slidably in the frame 2 to which it is connected by elastic means 32, such as a spring, for absorbing the play variations between the rotor 5 and the stator 4.
  • the second axial end 10 of the shaft 6 comprises a fourth housing 34 having the shape of a cap, with a solid surface, arranged centrally with respect to the axis A of the shaft 6 and arranged to receive the second spherical element 22 mounted free in said fourth housing 34.
  • the radius of the cap forming the fourth housing 34 is greater than the radius of the second spherical element 22.
  • the dimensions of the fourth housing 34 and the second spherical element 22 are such that said second spherical element 22 is in contact with the curved bottom of the fourth housing 34.
  • the second spherical element 22 is in the form of a ball mounted freely between the two caps forming the second and fourth housings 24, 34 between which the second spherical element 22 is maintained.
  • the cap forming the fourth housing 34 and the second spherical element 22 are perfectly spherical so as to have tangential contact between said fourth housing 34 and said second spherical element 22.
  • the radius of the cap forming the fourth housing 34 can be equal to or different from the radius of the cap forming the second housing 24.
  • the first spherical element 18 is integral with the first axial end 9 of the shaft 6.
  • the second spherical element 22 may be integral with the second axial end 10 of the 6.
  • the spherical element 18, 22 can be glued, driven on the end of the shaft 6, or formed in one piece with said shaft 6.
  • the spherical element is preferably made of ceramic, or any other suitable material, said material may have a slippery surface treatment (for example a polytetrafluoroethylene coating, such as Teflon®, or any other suitable coating known from those skilled in the art to have an extremely low coefficient of friction).
  • a slippery surface treatment for example a polytetrafluoroethylene coating, such as Teflon®, or any other suitable coating known from those skilled in the art to have an extremely low coefficient of friction.
  • the fluid compressor 1 further comprises first and second aerodynamic bearings provided substantially on each side of the shaft 6 of the rotor, towards the first and second axial ends 9 and 10, and shown schematically under the references 36 and 38.
  • the first aerodynamic bearing 36 is provided upstream of the turbine 12.
  • a third support member 40 having a central body 42 arranged centrally with respect to the axis A of the shaft 6 in the fluid supply channel 14, downstream of the first support member 26.
  • the first aerodynamic bearing 36 is housed in the central body 42.
  • the third support member 40 is held at the inner walls of said fluid supply channel 14 by means of three branches 44. These branches 44 are spaced apart from each other so as to allow the fluid to enter the compressor. These branches 44 comprise channels for supplying air to the first aerodynamic bearing 36.
  • the first aerodynamic bearing can be provided downstream of the turbine 12.
  • the channels for supplying air to the first aerodynamic bearing 36 can then be provided in the frame 2, which simplifies the construction of the whole.
  • the second aerodynamic bearing 38 is provided near the second axial end 10, and can be arranged to maintain axial and radial. According to a variant not shown, it is possible to associate the second support member 30 with an electromagnet system which allows, at low speed or in the event of a change of speed, to position said second support element 30 to support the second spherical element 22 to ensure the central positioning of the shaft 6 to ensure the axial and radial functional play at the second aerodynamic bearing 38. In other cases, the electromagnet system is arranged to move the second support element 30 of the second spherical element 22, and release said second spherical element 22, the aerodynamic bearing 38 then being sufficient to ensure the axial and radial functional play.
  • aerodynamic bearings used are known to those skilled in the art and do not require detailed description here. It is obvious that the use of aerodynamic bearings is optional, only the first and second bearings 7 and 8 can be used.
  • the machine 50 comprises a frame 52 enclosing at least one functional element 53 making it possible to perform the function of the machine, and a control unit 54.
  • the machine comprises a fluid compressor 1 , as described above, said fluid compressor 1 being integrated in the machine, inside the frame 52.
  • the frame 52 comprises a fluid inlet arranged to feed the fluid compressor 1 and bring the Fluid 52 also encloses a supply circuit 56 arranged to bring the compressed fluid leaving the fluid compressor 1 to the functional element 53.
  • the frame 52 also encloses a compressed fluid reservoir 58 and a pressure multiplier 59 provided between the fluid compressor 1 and the compressed fluid reservoir 58.
  • the frame 52 also contains a control unit 60 of the fluid compressor 1 arranged to activate the fluid compressor 1.
  • the control unit 54 is arranged to communicate with the control unit 60 in order to activate the fluid compressor 1 only, if necessary, by the functional element 53.
  • the fluid compressor 1 is disposed in the machine 50 by positioning the axis A of the shaft 6 of the rotor 5 vertically.
  • This vertical position as well as the bearings used according to the invention comprising a single centered spherical element make it possible to keep the weight of the rotor 5 in the center and to minimize the risk of displacement of the shaft 6. This is then self centering. 6, the bearings used according to the invention for axial and radial retention.
  • the use of aerodynamic bearings in combination with the bearings used according to the invention makes it possible to maintain a radial and axial functional clearance when starting or changing the speed of the rotor 5.
  • the fluid compressor used according to the invention achieves very high speeds of rotation, between 100,000 rpm and 1,000,000 rpm. These very high speeds make it possible to provide a fluid compressor of smaller dimensions for the same power, allowing its integration into the chassis of a machine. Any connection of the machine to a compressor belonging to a central network is deleted. Thus, the circuit for supplying the compressed fluid to the functional element is very short. This reduces on the one hand the risk of leakage, and on the other hand avoids the pollution that may occur during the transport of compressed fluid through a central network. This also allows a very fast reaction time of the compressor, so that the latter can operate only at the request of the functional element.
  • the fluid compressor 1 When no compressed fluid is requested by the functional element 53, the fluid compressor 1 is at a standstill so that there is no energy consumption during this rest period, hence a reduction in the overall energy consumption of the machine.
  • the fluid compressor used according to the invention operates without agent of lubrication, so that no lubricant will pollute the compressed fluid.
  • the machine according to the invention can be used in many applications, such as industrial applications, medical, pharmaceutical, food, automotive, including for the supply of compressed air, or refrigeration applications, heating or air conditioning, for the supply of compressed fluid.

Abstract

L'invention se rapporte à une machine (50) comprenant un châssis (52) comprenant au moins un élément fonctionnel (53) et une unité de pilotage (54). Ladite machine comprend un compresseur de fluide (1) intégré dans le châssis (52), ledit compresseur de fluide (1) comprenant un bâti (2) dans lequel sont montés un stator (4), un rotor (5) interagissant avec ledit stator (4) et comprenant un arbre (6), au moins une turbine (12) portée par ledit arbre (6), un canal d'amenée de fluide (14) vers la turbine (12), et un canal de sortie de fluide comprimé (16), l'arbre (6) du rotor (5) étant monté en rotation sur le bâti (2) autour d'un axe (A) au moyen d'un premier (7) et d'un second (8) paliers, ledit premier (7), respectivement ledit second (8), palier comprenant un premier (18), respectivement un second (22), élément sphérique prévu à une première (9), respectivement une seconde (10), extrémité de l'arbre et disposé de manière centrée par rapport à l'axe (A) de l'arbre (6), et un premier (20), respectivement un deuxième (24), logement prévu dans le bâti (2) présentant la forme d'une calotte disposée de manière centrée par rapport à l'axe (A) de l'arbre (6) et agencée pour supporter ledit premier (18), respectivement ledit second (22), élément sphérique. Ledit châssis (52) comporte une entrée de fluide agencée pour alimenter le compresseur de fluide (1) et un circuit d'alimentation (56) agencé pour apporter le fluide comprimé à l'élément fonctionnel (53).The invention relates to a machine (50) comprising a frame (52) comprising at least one functional element (53) and a control unit (54). Said machine comprises a fluid compressor (1) integrated in the frame (52), said fluid compressor (1) comprising a frame (2) in which are mounted a stator (4), a rotor (5) interacting with said stator (4) and comprising a shaft (6), at least one turbine (12) carried by said shaft (6), a fluid supply channel (14) to the turbine (12), and a fluid outlet channel compressed (16), the shaft (6) of the rotor (5) being rotatably mounted on the frame (2) about an axis (A) by means of a first (7) and a second (8) bearings, said first (7), respectively said second (8), bearing comprising a first (18), respectively a second (22), spherical element provided at a first (9), respectively a second (10), end of the shaft and disposed centrally relative to the axis (A) of the shaft (6), and a first (20), respectively a second (24) housing provided in the frame (2) having the shape of a cap disposed of re centered relative to the axis (A) of the shaft (6) and arranged to support said first (18), respectively said second (22), spherical element. Said frame (52) has a fluid inlet arranged to feed the fluid compressor (1) and a supply circuit (56) arranged to supply the compressed fluid to the functional element (53).

Description

Domaine de l'inventionField of the invention

La présente invention se rapporte à une machine comprenant un châssis renfermant au moins un élément fonctionnel et une unité de pilotage, et équipée d'un compresseur de fluide, et plus particulièrement un compresseur de fluide à haute vitesse.The present invention relates to a machine comprising a chassis enclosing at least one functional element and a control unit, and equipped with a fluid compressor, and more particularly a high-speed fluid compressor.

Arrière-plan de l'inventionBackground of the invention

Les compresseurs de fluide équipant de telles machines sont appelés généralement turbocompresseurs ou compresseurs centrifuges. Ils sont équipés d'un stator et d'un rotor formant un moteur synchrone à aimant permanent (moteur brushless). Les compresseurs de ce type peuvent atteindre de très hautes vitesses, par exemple de 100 000 à 500 000 tours/minute. Le moteur entraine la turbine à régime élevé, la turbine comprimant le fluide. Le fluide peut être de l'air, de l'eau, un gaz, un réfrigérant ou tout autre fluide approprié. Ces compresseurs sont utilisés dans de nombreuses applications industrielles, médicales, pharmaceutiques, alimentaires, automobiles, notamment pour l'apport d'air comprimé, ou des applications frigorifiques, de chauffage ou de climatisation, pour l'apport de fluide comprimé.The fluid compressors equipping such machines are generally called turbochargers or centrifugal compressors. They are equipped with a stator and a rotor forming a permanent magnet synchronous motor (brushless motor). Compressors of this type can reach very high speeds, for example from 100,000 to 500,000 revolutions / minute. The motor drives the turbine at high speed, the turbine compressing the fluid. The fluid can be air, water, a gas, a refrigerant or any other suitable fluid. These compressors are used in many industrial, medical, pharmaceutical, food, automotive applications, particularly for the supply of compressed air, or refrigeration, heating or air conditioning applications, for the supply of compressed fluid.

Ces compresseurs sont généralement utilisés dans des installations de très grandes dimensions, le compresseur étant éloigné de l'équipement nécessitant du fluide comprimé. Le fluide comprimé est amené au moyen d'un circuit d'alimentation prévu dans le réseau. Généralement, ce circuit d'alimentation est long, ce qui entraine des risques de fuites de fluide le long du circuit. Des fuites dans un circuit d'air comprimé entrainent des pertes de pression, ce qui génère des pertes financières très importantes.These compressors are generally used in very large installations, the compressor being far from the equipment requiring compressed fluid. The compressed fluid is supplied by means of a supply circuit provided in the network. Generally, this supply circuit is long, which entails risks of leakage of fluid along the circuit. Leaks in a compressed air circuit cause pressure losses, which generates very significant financial losses.

De plus, en raison de la distance séparant le compresseur de l'équipement nécessitant le fluide comprimé, le réseau est maintenu en pression en permanence afin de pouvoir répondre rapidement au besoin de l'équipement. Le fonctionnement en permanence du compresseur représente une consommation d'énergie électrique importante.In addition, because of the distance separating the compressor from the equipment requiring the compressed fluid, the network is kept under pressure at all times in order to be able to respond rapidly to the need of the equipment. The continuous operation of the compressor represents a significant electrical energy consumption.

Par ailleurs, dans ces compresseurs, l'arbre du moteur est monté rotatif sur un bâti au moyen de deux paliers axiaux. Ces paliers peuvent comprendre des roulements à billes. Toutefois, il est difficile d'obtenir des vitesses de rotation avec de tels roulements en raison de la différence de vitesse entre les billes et les bagues. De plus, bien que les billes utilisées soient en céramique, la durée de vie de tels roulements est limitée à une centaine d'heures en raison des vitesses de rotation élevées. D'autres types de palier peuvent être utilisés, tels que des paliers aérodynamiques. Toutefois, ce type de paliers présente l'inconvénient de se déplacer transversalement au moment du démarrage ou lors de changement de régime, ce qui crée des frottements au niveau des éléments du palier..Moreover, in these compressors, the motor shaft is rotatably mounted on a frame by means of two axial bearings. These bearings may include ball bearings. However, it is difficult to obtain rotational speeds with such bearings because of the difference in speed between the balls and the rings. In addition, although the balls used are ceramic, the life of such bearings is limited to a hundred hours because of high rotational speeds. Other types of bearing may be used, such as aerodynamic bearings. However, this type of bearing has the disadvantage of moving transversely at the time of starting or during a change of speed, which creates friction at the level of the bearing elements.

Enfin, les compresseurs sont généralement lubrifiés au moyen d'un lubrifiant. L'inconvénient est que le lubrifiant risque de se mélanger au fluide, de sorte que le fluide comprimé est pollué par le lubrifiant. De même, des impuretés présentes dans le réseau central peuvent se mêler au fluide comprimé. Cela est particulièrement dangereux par exemple dans le cas d'applications médicales, telles que les applications dentaires, pour lesquelles l'air comprimé arrivant dans la bouche doit être sain.Finally, the compressors are usually lubricated with a lubricant. The disadvantage is that the lubricant may mix with the fluid, so that the compressed fluid is polluted by the lubricant. Similarly, impurities present in the central network may mingle with the compressed fluid. This is particularly dangerous, for example in the case of medical applications, such as dental applications, for which the compressed air arriving in the mouth must be healthy.

Résumé de l'inventionSummary of the invention

L'invention a notamment pour objectif de pallier les différents inconvénients des machines équipées de compresseurs à haute vitesse connues.The invention particularly aims to overcome the various disadvantages of machines equipped with known high-speed compressors.

Plus précisément, un objectif de l'invention est de fournir une machine comprenant un équipement nécessitant du fluide comprimé et qui présente un fonctionnement autonome.More specifically, an object of the invention is to provide a machine comprising equipment requiring compressed fluid and having an independent operation.

L'invention a également pour objectif de fournir une machine comprenant un équipement nécessitant du fluide comprimé et qui permet de réduire la consommation d'énergie électrique et de limiter les pertes énergétiques liées aux fuites le long du circuit de fluideAnother object of the invention is to provide a machine comprising equipment requiring compressed fluid and which makes it possible to reduce the consumption of electrical energy and to limit leakage energy losses along the fluid circuit.

L'invention a également pour objectif de fournir une machine comprenant un compresseur de fluide à haute vitesse ne nécessitant pas d'agent lubrifiant et n'entrainant aucune pollution du fluide comprimé.The invention also aims to provide a machine comprising a high-speed fluid compressor that does not require a lubricating agent and does not cause any pollution of the compressed fluid.

A cet effet, la présente invention concerne une machine comprenant un châssis comprenant au moins un élément fonctionnel et une unité de pilotage.For this purpose, the present invention relates to a machine comprising a frame comprising at least one functional element and a control unit.

Selon l'invention, ladite machine comprend un compresseur de fluide intégré dans le châssis, ledit compresseur de fluide comprenant un bâti dans lequel sont montés un stator, un rotor interagissant avec ledit stator et comprenant un arbre, au moins une turbine portée par ledit arbre, un canal d'amenée de fluide vers la turbine, et un canal de sortie de fluide comprimé, l'arbre du rotor étant monté en rotation sur le bâti autour d'un axe au moyen d'un premier et d'un second paliers, ledit premier, respectivement ledit second, palier comprenant :

  • un premier, respectivement un second, élément sphérique prévu à une première, respectivement une seconde, extrémité de l'arbre et disposé de manière centrée par rapport à l'axe de l'arbre, et
  • un premier, respectivement un deuxième, logement prévu dans le bâti et présentant la forme d'une calotte disposée de manière centrée par rapport à l'axe de l'arbre et agencée pour supporter ledit premier, respectivement ledit second, élément sphérique,
et ledit châssis comporte une entrée de fluide agencée pour alimenter le compresseur de fluide et un circuit d'alimentation agencé pour apporter le fluide comprimé à l'élément fonctionnel.According to the invention, said machine comprises a fluid compressor integrated in the frame, said fluid compressor comprising a frame in which are mounted a stator, a rotor interacting with said stator and comprising a shaft, at least one turbine carried by said shaft , a fluid supply channel to the turbine, and a compressed fluid outlet channel, the rotor shaft being rotatably mounted on the frame about an axis by means of a first and a second bearings said first, respectively said second bearing comprising:
  • a first, respectively a second, spherical element provided at a first, respectively a second, end of the shaft and arranged centrally with respect to the axis of the shaft, and
  • a first, respectively a second, housing provided in the frame and having the shape of a cap disposed centrally relative to the axis of the shaft and arranged to support said first, respectively said second, spherical element,
and said frame comprises a fluid inlet arranged to supply the fluid compressor and a supply circuit arranged to supply the compressed fluid to the functional element.

Ainsi, la machine selon l'invention est particulièrement compacte, permet de réduire la longueur du circuit d'alimentation de fluide comprimé de manière à limiter les pertes, et fonctionne de manière autonome.Thus, the machine according to the invention is particularly compact, reduces the length of the compressed fluid supply circuit so as to limit losses, and operates autonomously.

De plus, elle intègre un compresseur de fluide pouvant tourner à très haute vitesse, sans utiliser d'agent de lubrification susceptible de polluer le fluide comprimé.In addition, it incorporates a fluid compressor that can rotate at a very high speed, without using a lubricating agent capable of polluting the compressed fluid.

D'une manière avantageuse, le premier logement peut être prévu dans le canal d'amenée de fluide.Advantageously, the first housing can be provided in the fluid supply channel.

Selon un mode de réalisation particulièrement préféré, ledit premier logement peut être prévu dans un premier élément-support disposé de manière centrée par rapport à l'axe de l'arbre dans le canal d'amenée de fluide, et maintenu aux parois dudit canal d'amenée de fluide au moyen de branches entre lesquelles le fluide peut circuler.According to a particularly preferred embodiment, said first housing can be provided in a first support element arranged centrally with respect to the axis of the shaft in the fluid supply channel, and held at the walls of said channel fluid supply by means of branches between which the fluid can flow.

D'une manière avantageuse, le deuxième logement peut être prévu dans un deuxième élément-support disposé dans le bâti de manière centrée par rapport à l'axe de l'arbre et à l'opposé du premier élément-support.Advantageously, the second housing can be provided in a second support element disposed in the frame centrally with respect to the axis of the shaft and opposite the first support element.

Selon un mode de réalisation préféré, le deuxième élément-support peut être monté de manière coulissante dans le bâti et être relié audit bâti par des moyens élastiques agencés pour absorber les variations de jeu entre le rotor et le stator.According to a preferred embodiment, the second support element can be slidably mounted in the frame and be connected to said frame by elastic means arranged to absorb the play variations between the rotor and the stator.

D'une manière avantageuse, le compresseur de fluide comprend en outre au moins deux paliers aérodynamiques prévus sensiblement de chaque côté de l'arbre du rotor.Advantageously, the fluid compressor further comprises at least two aerodynamic bearings provided substantially on each side of the rotor shaft.

Selon un mode de réalisation, un premier palier aérodynamique peut être prévu en amont de la turbine, ledit premier palier aérodynamique étant porté par un troisième élément-support disposé de manière centrée par rapport à l'axe de l'arbre dans le canal d'amenée de fluide, et maintenu aux parois dudit canal d'amenée de fluide au moyen de branches entre lesquelles le fluide peut circuler.According to one embodiment, a first aerodynamic bearing can be provided upstream of the turbine, said first aerodynamic bearing being carried by a third support element arranged centrally with respect to the axis of the shaft in the channel of fluid supply, and maintained at the walls of said fluid supply channel by means of branches between which the fluid can flow.

Selon un autre mode de réalisation, un premier palier aérodynamique peut être prévu en aval de la turbine.According to another embodiment, a first aerodynamic bearing may be provided downstream of the turbine.

D'une manière avantageuse, un deuxième palier aérodynamique peut être prévu au niveau de l'extrémité de l'arbre du rotor, du côté opposé au canal d'amenée de fluide.Advantageously, a second aerodynamic bearing may be provided at the end of the rotor shaft, on the opposite side to the fluid supply channel.

Selon un mode de réalisation préféré, au moins l'une des première et seconde extrémités de l'arbre du rotor peut comprendre un troisième logement présentant la forme d'une calotte disposée de manière centrée par rapport à l'axe de l'arbre et agencée pour recevoir ledit élément sphérique monté libre dans ledit troisième logement.According to a preferred embodiment, at least one of the first and second ends of the rotor shaft may comprise a third housing having the shape of a cap disposed centrally with respect to the axis of the shaft and arranged to receive said free mounted spherical element in said third housing.

Selon un autre mode de réalisation, l'élément sphérique peut être solidaire d'au moins l'une des première et seconde extrémités de l'arbre du rotor.According to another embodiment, the spherical element may be integral with at least one of the first and second ends of the rotor shaft.

Selon un mode de réalisation préféré, le circuit d'alimentation de fluide peut comprendre un réservoir de fluide comprimé et éventuellement un multiplicateur de pression prévu entre le compresseur de fluide et le réservoir de fluide comprimé.According to a preferred embodiment, the fluid supply circuit may comprise a compressed fluid reservoir and optionally a pressure multiplier provided between the fluid compressor and the compressed fluid reservoir.

Selon un mode de réalisation préféré, l'unité de pilotage peut comprendre des moyens d'activation du compresseur de fluide agencés pour activer ledit compresseur de fluide seulement en cas de besoin par l'élément fonctionnel.According to a preferred embodiment, the control unit may comprise activation means of the fluid compressor arranged to activate said fluid compressor only if necessary by the functional element.

Brève description des dessinsBrief description of the drawings

Les buts, avantages et caractéristiques de la présente invention apparaîtront plus clairement dans la description détaillée suivante d'une forme de réalisation de l'invention donnée uniquement à titre d'exemple non limitatif et illustrée par les dessins annexés sur lesquels :

  • la figure 1 représente une vue en perspective d'un compresseur de fluide à haute vitesse utilisé dans une machine selon l'invention,
  • la figure 2 représente une vue en coupe du compresseur de la figure 1,
  • les figures 3 et 4 sont des vues agrandies des zones B et C respectivement de la figure 2, et
  • la figure 5 illustre schématiquement une machine selon l'invention.
The objects, advantages and features of the present invention will appear more clearly in the following detailed description of an embodiment of the invention given solely by way of nonlimiting example and illustrated by the appended drawings in which:
  • the figure 1 is a perspective view of a high speed fluid compressor used in a machine according to the invention,
  • the figure 2 represents a sectional view of the compressor of the figure 1 ,
  • the Figures 3 and 4 are enlarged views of areas B and C respectively of the figure 2 , and
  • the figure 5 schematically illustrates a machine according to the invention.

Description détaillée de l'inventionDetailed description of the invention

En référence aux figures 1 et 2, il est représenté un compresseur de fluide 1 à haute vitesse, du type turbocompresseur ou compresseur centrifuge. Dans la description qui suit, le terme « compresseur de fluide » désigne d'une manière générique à la fois un compresseur utilisé pour augmenter la pression d'un gaz et une pompe utilisée pour augmenter la pression d'un liquide, par un procédé mécanique. Le fluide peut être de l'air, un gaz, de la vapeur d'eau, de l'eau, un réfrigérant ou tout autre fluide approprié.With reference to Figures 1 and 2 , there is shown a high-speed fluid compressor 1, of the turbocharger or centrifugal compressor type. In the following description, the term "fluid compressor" generically refers to both a compressor used to increase the pressure of a gas and a pump used to increase the pressure of a liquid, by a mechanical process. . The fluid may be air, a gas, water vapor, water, a refrigerant or any other suitable fluid.

D'une manière connue en soi, le compresseur comprend un bâti 2 dans lequel sont montés un stator et un rotor, représentés schématiquement sous les références 4 et 5, respectivement. Le stator 4 et le rotor 5 interagissent pour former un moteur synchrone à aimant permanent (moteur brushless).In a manner known per se, the compressor comprises a frame 2 in which are mounted a stator and a rotor, shown schematically under the references 4 and 5, respectively. The stator 4 and the rotor 5 interact to form a permanent magnet synchronous motor (brushless motor).

Le rotor 5 comprend un arbre 6 monté en rotation sur le bâti 2 autour d'un axe A au moyen d'un premier palier 7 et d'un second palier 8, le premier palier 7 étant agencé pour supporter la première extrémité axiale 9 de l'arbre 6 et le second palier 8 étant agencé pour supporter la seconde extrémité axiale 10 de l'arbre 6. Les premier et second paliers 7 et 8 seront décrits en détails ci-après.The rotor 5 comprises a shaft 6 rotatably mounted on the frame 2 about an axis A by means of a first bearing 7 and a second bearing 8, the first bearing 7 being arranged to support the first axial end 9 of the shaft 6 and the second bearing 8 being arranged to support the second axial end 10 of the shaft 6. The first and second bearings 7 and 8 will be described in detail below.

L'arbre 6 porte une turbine 12 disposée du côté de la première extrémité axiale 9. Il est bien sûr possible de prévoir plusieurs turbines.The shaft 6 carries a turbine 12 disposed on the side of the first axial end 9. It is of course possible to provide several turbines.

Le compresseur 1 comprend également un canal d'amenée de fluide 14 en direction de la turbine 12, un corps 15, ainsi qu'un canal de sortie de fluide comprimé 16, ces éléments étant solidaires du bâti 2.The compressor 1 also comprises a fluid supply channel 14 in the direction of the turbine 12, a body 15, as well as an outlet channel of compressed fluid 16, these elements being integral with the frame 2.

Ces différents éléments du compresseur de fluide sont connus de l'homme du métier et ne nécessitent pas ici de description détaillée.These various elements of the fluid compressor are known to those skilled in the art and do not require detailed description here.

Conformément à l'invention, le premier palier 7 comprend un premier élément sphérique 18 disposé à la première extrémité 9 de l'arbre 6, de manière centrée par rapport à l'axe A de l'arbre 6 et un premier logement 20 prévu sur le bâti 2 présentant la forme d'une calotte disposée de manière centrée par rapport à l'axe A de l'arbre 6 et agencée pour supporter ledit premier élément sphérique 18.According to the invention, the first bearing 7 comprises a first spherical element 18 disposed at the first end 9 of the shaft 6, centrally relative to the axis A of the shaft 6 and a first housing 20 provided on the frame 2 having the shape of a cap disposed centrally relative to the axis A of the shaft 6 and arranged to support said first spherical element 18.

D'une manière similaire, le second palier 8 comprend un second élément sphérique 22 disposé à la seconde extrémité 10 de l'arbre 6, de manière centrée par rapport à l'axe A de l'arbre 6 et un deuxième logement 24 prévu sur le bâti 2 présentant la forme d'une calotte disposée de manière centrée par rapport à l'axe A de l'arbre 6 et agencée pour supporter ledit second élément sphérique 22.In a similar manner, the second bearing 8 comprises a second spherical element 22 disposed at the second end 10 of the shaft 6, centrally with respect to the axis A of the shaft 6 and a second housing 24 provided on the frame 2 having the shape of a cap disposed centrally relative to the axis A of the shaft 6 and arranged to support said second spherical element 22.

Comme le montre plus précisément la figure 3, le premier logement 20 supportant le premier élément sphérique 18 est prévu dans le canal d'amenée de fluide 14. A cet effet, un premier élément-support 26 présentant une forme ovoïde tronquée est disposé de manière centrée par rapport à l'axe A de l'arbre 6 dans le canal d'amenée de fluide 14. Le premier logement 20 présente la forme d'une calotte, de surface pleine, réalisée à l'extrémité du premier élément-support 26 qui est dirigée vers l'intérieur. Le rayon de la calotte formant le premier logement 20 est supérieur au rayon du premier élément sphérique 18. Les dimensions du premier logement 20 et du premier élément sphérique 18 sont telles que ledit premier élément sphérique 18 est au contact du fond incurvé du premier logement 20. De préférence, la calotte formant le premier logement 20 et le premier élément sphérique 18 sont parfaitement sphériques afin d'avoir un contact tangentiel entre ledit premier logement 20 et ledit premier élément sphérique 18. Le premier élément-support 26 est maintenu aux parois intérieures dudit canal d'amenée de fluide 14 au moyen de trois branches 28 (cf. Figure 1). Ces branches 28 sont espacées les unes des autres de manière à permettre au fluide d'entrer dans le compresseur.As shown more specifically figure 3 , the first housing 20 supporting the first spherical element 18 is provided in the fluid supply channel 14. For this purpose, a first support element 26 having a truncated ovoid shape is disposed centrally with respect to the axis A of the shaft 6 in the fluid supply channel 14. The first housing 20 has the shape of a cap, solid surface, made at the end of the first support member 26 which is directed inwardly. The radius of the cap forming the first housing 20 is greater than the radius of the first spherical element 18. The dimensions of the first housing 20 and the first spherical element 18 are such that said first spherical element 18 is in contact with the curved bottom of the first housing 20 Preferably, the cap forming the first housing 20 and the first spherical element 18 are perfectly spherical in order to have a tangential contact between said first housing 20 and said first spherical element 18. The first support element 26 is maintained at internal walls of said fluid supply channel 14 by means of three branches 28 (cf. Figure 1 ). These branches 28 are spaced apart from each other so as to allow the fluid to enter the compressor.

Selon le mode de réalisation représenté, la première extrémité axiale 9 de l'arbre 6 comprend un troisième logement 29 présentant la forme d'une calotte, de surface pleine, disposée de manière centrée par rapport à l'axe A de l'arbre 6 et agencée pour recevoir le premier élément sphérique 18 monté libre dans ledit troisième logement 29. Le rayon de la calotte formant le troisième logement 29 est supérieur au rayon du premier élément sphérique 18. Les dimensions du troisième logement 29 et du premier élément sphérique 18 sont telles que ledit premier élément sphérique 18 est au contact du fond incurvé du troisième logement 29. Ainsi, le premier élément sphérique 18 se présente sous la forme d'une bille montée libre entre les deux calottes formant les premier et troisième logements 20, 29 entre lesquels le premier élément sphérique 18 est maintenu. De préférence, la calotte formant le troisième logement 29 et le premier élément sphérique 18 sont parfaitement sphériques afin d'avoir un contact tangentiel entre ledit troisième logement 29 et ledit premier élément sphérique 18. Le rayon de la calotte formant le troisième logement 29 peut être égal ou différent du rayon de la calotte formant le premier logement 20.According to the embodiment shown, the first axial end 9 of the shaft 6 comprises a third housing 29 having the shape of a cap, with a solid surface, arranged centrally with respect to the axis A of the shaft 6 and arranged to receive the first spherical element 18 mounted free in said third housing 29. The radius of the cap forming the third housing 29 is greater than the radius of the first spherical element 18. The dimensions of the third housing 29 and the first spherical element 18 are such that said first spherical element 18 is in contact with the curved bottom of the third housing 29. Thus, the first spherical element 18 is in the form of a ball mounted freely between the two caps forming the first and third housings 20, 29 between which the first spherical element 18 is maintained. Preferably, the cap forming the third housing 29 and the first spherical element 18 are perfectly spherical so as to have a tangential contact between said third housing 29 and said first spherical element 18. The radius of the cap forming the third housing 29 can be equal to or different from the radius of the cap forming the first housing 20.

Comme le montre plus précisément la figure 4, le deuxième logement 24 supportant le second élément sphérique 22 est prévu dans un deuxième élément-support 30 disposé dans le bâti 2 de manière centrée par rapport à l'axe A de l'arbre 6, et à l'opposé du premier élément-support 26. Le deuxième logement 24 est formé dans le deuxième élément-support 30 sous la forme d'une calotte, de surface pleine, disposée en regard de l'arbre 6. Le rayon de la calotte formant le deuxième logement 24 est supérieur au rayon du second élément sphérique 22. Les dimensions du deuxième logement 24 et du second élément sphérique 22 sont telles que ledit second élément sphérique 22 est au contact du fond incurvé du deuxième logement 24. De préférence, la calotte formant le deuxième logement 24 et le second élément sphérique 22 sont parfaitement sphériques afin d'avoir un contact tangentiel entre ledit deuxième logement 24 et ledit second élément sphérique 22. Le deuxième élément-support 30 est monté de manière coulissante dans le bâti 2 auquel il est relié par des moyens élastiques 32, tel qu'un ressort, permettant d'absorber les variations de jeu entre le rotor 5 et le stator 4.As shown more specifically figure 4 , the second housing 24 supporting the second spherical element 22 is provided in a second support element 30 disposed in the frame 2 centrally with respect to the axis A of the shaft 6, and opposite the first element- 26. The second housing 24 is formed in the second support element 30 in the form of a cap, with a solid surface, disposed facing the shaft 6. The radius of the cap forming the second housing 24 is greater than the radius of the second spherical element 22. The dimensions of the second housing 24 and the second spherical element 22 are such that said second spherical element 22 is in contact with the curved bottom of the second housing 24. Preferably, the cap forming the second housing 24 and the second spherical element 22 are perfectly spherical so as to have tangential contact between said second housing 24 and said second spherical element 22. The second support element 30 is mounted so that slidably in the frame 2 to which it is connected by elastic means 32, such as a spring, for absorbing the play variations between the rotor 5 and the stator 4.

Selon le mode de réalisation représenté, la seconde extrémité axiale 10 de l'arbre 6 comprend un quatrième logement 34 présentant la forme d'une calotte, de surface pleine, disposée de manière centrée par rapport à l'axe A de l'arbre 6 et agencée pour recevoir le second élément sphérique 22 monté libre dans ledit quatrième logement 34. Le rayon de la calotte formant le quatrième logement 34 est supérieur au rayon du second élément sphérique 22. Les dimensions du quatrième logement 34 et du second élément sphérique 22 sont telles que ledit second élément sphérique 22 est au contact du fond incurvé du quatrième logement 34. Ainsi, le second élément sphérique 22 se présente sous la forme d'une bille montée libre entre les deux calottes formant les deuxième et quatrième logements 24, 34 entre lesquels le second élément sphérique 22 est maintenu. De préférence, la calotte formant le quatrième logement 34 et le second élément sphérique 22 sont parfaitement sphériques afin d'avoir un contact tangentiel entre ledit quatrième logement 34 et ledit second élément sphérique 22. Le rayon de la calotte formant le quatrième logement 34 peut être égal ou différent du rayon de la calotte formant le deuxième logement 24.According to the embodiment shown, the second axial end 10 of the shaft 6 comprises a fourth housing 34 having the shape of a cap, with a solid surface, arranged centrally with respect to the axis A of the shaft 6 and arranged to receive the second spherical element 22 mounted free in said fourth housing 34. The radius of the cap forming the fourth housing 34 is greater than the radius of the second spherical element 22. The dimensions of the fourth housing 34 and the second spherical element 22 are such that said second spherical element 22 is in contact with the curved bottom of the fourth housing 34. Thus, the second spherical element 22 is in the form of a ball mounted freely between the two caps forming the second and fourth housings 24, 34 between which the second spherical element 22 is maintained. Preferably, the cap forming the fourth housing 34 and the second spherical element 22 are perfectly spherical so as to have tangential contact between said fourth housing 34 and said second spherical element 22. The radius of the cap forming the fourth housing 34 can be equal to or different from the radius of the cap forming the second housing 24.

Selon une autre variante de réalisation non représentée, le premier élément sphérique 18 est solidaire de la première extrémité axiale 9 de l'arbre 6. D'une manière similaire, le second élément sphérique 22 peut être solidaire de la seconde extrémité axiale 10 de l'arbre 6. A cet effet, l'élément sphérique 18, 22 peut être collé, chassé sur l'extrémité de l'arbre 6, ou formé d'une seule pièce avec ledit arbre 6.According to another variant embodiment not shown, the first spherical element 18 is integral with the first axial end 9 of the shaft 6. In a similar manner, the second spherical element 22 may be integral with the second axial end 10 of the 6. For this purpose, the spherical element 18, 22 can be glued, driven on the end of the shaft 6, or formed in one piece with said shaft 6.

L'élément sphérique est réalisé de préférence en céramique, ou en tout autre matériau approprié, ledit matériau pouvant présenter un traitement de surface à effet glissant (par exemple un revêtement en polytétrafluoroéthylène, tel que le Téflon®, ou tout autre revêtement approprié connu de l'homme du métier pour présenter un coefficient de frottement extrêmement faible).The spherical element is preferably made of ceramic, or any other suitable material, said material may have a slippery surface treatment (for example a polytetrafluoroethylene coating, such as Teflon®, or any other suitable coating known from those skilled in the art to have an extremely low coefficient of friction).

D'une manière avantageuse, le compresseur de fluide 1 comprend en outre un premier et un second paliers aérodynamiques prévus sensiblement de chaque côté de l'arbre 6 du rotor, vers les première et seconde extrémités axiales 9 et 10, et représentés schématiquement sous les références 36 et 38.Advantageously, the fluid compressor 1 further comprises first and second aerodynamic bearings provided substantially on each side of the shaft 6 of the rotor, towards the first and second axial ends 9 and 10, and shown schematically under the references 36 and 38.

Selon le mode de réalisation représenté sur la figure 3, le premier palier aérodynamique 36 est prévu en amont de la turbine 12. A cet effet, il est prévu un troisième élément-support 40 présentant un corps central 42 disposé de manière centrée par rapport à l'axe A de l'arbre 6 dans le canal d'amenée de fluide 14, en aval du premier élément-support 26. Le premier palier aérodynamique 36 est logé dans le corps central 42. Le troisième élément-support 40 est maintenu aux parois intérieures dudit canal d'amenée de fluide 14 au moyen de trois branches 44. Ces branches 44 sont espacées les unes des autres de manière à permettre au fluide d'entrer dans le compresseur. Ces branches 44 comprennent des canaux permettant d'amener de l'air au premier palier aérodynamique 36.According to the embodiment shown on the figure 3 , the first aerodynamic bearing 36 is provided upstream of the turbine 12. For this purpose, there is provided a third support member 40 having a central body 42 arranged centrally with respect to the axis A of the shaft 6 in the fluid supply channel 14, downstream of the first support member 26. The first aerodynamic bearing 36 is housed in the central body 42. The third support member 40 is held at the inner walls of said fluid supply channel 14 by means of three branches 44. These branches 44 are spaced apart from each other so as to allow the fluid to enter the compressor. These branches 44 comprise channels for supplying air to the first aerodynamic bearing 36.

Dans une autre variante non représentée, le premier palier aérodynamique peut être prévu en aval de la turbine 12. Les canaux permettant d'amener de l'air au premier palier aérodynamique 36 peuvent alors être prévus dans le bâti 2, ce qui permet de simplifier la construction de l'ensemble.In another variant not shown, the first aerodynamic bearing can be provided downstream of the turbine 12. The channels for supplying air to the first aerodynamic bearing 36 can then be provided in the frame 2, which simplifies the construction of the whole.

Le deuxième palier aérodynamique 38 est prévu à proximité de la seconde extrémité axiale 10, et peut être disposé pour assurer un maintien axial et radial. Selon une variante non représentée, il est possible d'associer le deuxième élément-support 30 à un système d'électro-aimant qui permet, à bas régime ou en cas de changement de régime, de positionner ledit deuxième élément-support 30 pour supporter le second élément sphérique 22 afin d'assurer le positionnement central de l'arbre 6 pour garantir le jeu fonctionnel axial et radial au niveau du deuxième palier aérodynamique 38. Dans les autres cas, le système d'électro-aimant est agencé pour éloigner le deuxième élément-support 30 du second élément sphérique 22, et libérer ledit second élément sphérique 22, le palier aérodynamique 38 étant alors suffisant pour garantir le jeu fonctionnel axial et radial.The second aerodynamic bearing 38 is provided near the second axial end 10, and can be arranged to maintain axial and radial. According to a variant not shown, it is possible to associate the second support member 30 with an electromagnet system which allows, at low speed or in the event of a change of speed, to position said second support element 30 to support the second spherical element 22 to ensure the central positioning of the shaft 6 to ensure the axial and radial functional play at the second aerodynamic bearing 38. In other cases, the electromagnet system is arranged to move the second support element 30 of the second spherical element 22, and release said second spherical element 22, the aerodynamic bearing 38 then being sufficient to ensure the axial and radial functional play.

Les paliers aérodynamiques utilisés sont connus de l'homme du métier et ne nécessitent pas ici de description détaillée. Il est bien évident que l'utilisation de paliers aérodynamiques est optionnelle, seuls les premier et second paliers 7 et 8 pouvant être utilisés.The aerodynamic bearings used are known to those skilled in the art and do not require detailed description here. It is obvious that the use of aerodynamic bearings is optional, only the first and second bearings 7 and 8 can be used.

En référence à la figure 5, la machine 50 selon l'invention comprend un châssis 52 renfermant au moins un élément fonctionnel 53 permettant d'accomplir la fonction de la machine, et une unité de pilotage 54. Conformément à l'invention, la machine comprend un compresseur de fluide 1, tel que décrit ci-dessus, ledit compresseur de fluide 1 étant intégré dans la machine, à l'intérieur du châssis 52. A cet effet, le châssis 52 comporte une entrée de fluide agencée pour alimenter le compresseur de fluide 1 et amener le fluide au niveau du canal d'amenée de fluide 14. Le châssis 52 renferme également un circuit d'alimentation 56 agencé pour amener le fluide comprimé sortant du compresseur de fluide 1 à l'élément fonctionnel 53.With reference to the figure 5 , the machine 50 according to the invention comprises a frame 52 enclosing at least one functional element 53 making it possible to perform the function of the machine, and a control unit 54. According to the invention, the machine comprises a fluid compressor 1 , as described above, said fluid compressor 1 being integrated in the machine, inside the frame 52. For this purpose, the frame 52 comprises a fluid inlet arranged to feed the fluid compressor 1 and bring the Fluid 52 also encloses a supply circuit 56 arranged to bring the compressed fluid leaving the fluid compressor 1 to the functional element 53.

Le châssis 52 renferme également un réservoir de fluide comprimé 58 ainsi qu'un multiplicateur de pression 59 prévu entre le compresseur de fluide 1 et le réservoir de fluide comprimé 58.The frame 52 also encloses a compressed fluid reservoir 58 and a pressure multiplier 59 provided between the fluid compressor 1 and the compressed fluid reservoir 58.

Le châssis 52 renferme en outre une unité de commande 60 du compresseur de fluide 1 agencée pour activer le compresseur de fluide 1.The frame 52 also contains a control unit 60 of the fluid compressor 1 arranged to activate the fluid compressor 1.

L'unité de pilotage 54 est agencée pour communiquer avec l'unité de commande 60 afin d'activer le compresseur de fluide 1 seulement en cas de besoin par l'élément fonctionnel 53.The control unit 54 is arranged to communicate with the control unit 60 in order to activate the fluid compressor 1 only, if necessary, by the functional element 53.

D'une manière préférée, le compresseur de fluide 1 est disposé dans la machine 50 en positionnant l'axe A de l'arbre 6 du rotor 5 à la verticale. Cette position verticale ainsi que les paliers utilisés selon l'invention comprenant un unique élément sphérique centré permettent de maintenir au centre le poids du rotor 5 et de réduire au maximum les risques de déplacement de l'arbre 6. On a alors un autocentrage de l'arbre 6, les paliers utilisés selon l'invention permettant un maintien axial et radial. De plus, l'utilisation de paliers aérodynamiques en combinaison avec les paliers utilisés selon l'invention permet de maintenir un jeu fonctionnel radial et axial lors du démarrage ou de changement de régime du rotor 5.In a preferred manner, the fluid compressor 1 is disposed in the machine 50 by positioning the axis A of the shaft 6 of the rotor 5 vertically. This vertical position as well as the bearings used according to the invention comprising a single centered spherical element make it possible to keep the weight of the rotor 5 in the center and to minimize the risk of displacement of the shaft 6. This is then self centering. 6, the bearings used according to the invention for axial and radial retention. In addition, the use of aerodynamic bearings in combination with the bearings used according to the invention makes it possible to maintain a radial and axial functional clearance when starting or changing the speed of the rotor 5.

Le compresseur de fluide utilisé selon l'invention permet d'atteindre des vitesses de rotation très élevées, comprises entre 100 000 tr/min et 1 000 000 tr/min. Ces très hautes vitesses permettent de prévoir un compresseur de fluide de dimensions plus petites pour une même puissance, autorisant son intégration dans le châssis d'une machine. Toute connexion de la machine à un compresseur appartenant à un réseau central est supprimée. Ainsi, le circuit d'amenée du fluide comprimé à l'élément fonctionnel est très court. Cela réduit d'une part les risques de fuite, et d'autre part évite les pollutions susceptibles d'apparaitre au cours du transport du fluide comprimé à travers un réseau central. Cela permet également un temps de réaction très rapide du compresseur, de sorte que ce dernier peut fonctionner uniquement à la demande de l'élément fonctionnel. Lorsqu'aucun fluide comprimé n'est demandé par l'élément fonctionnel 53, le compresseur de fluide 1 est à l'arrêt de sorte qu'il n'y a pas de consommation d'énergie pendant cette période de repos, d'où une réduction de la consommation d'énergie globale de la machine. De plus, le compresseur de fluide utilisé selon l'invention fonctionne sans agent de lubrification, de sorte qu'aucun lubrifiant ne risque de polluer le fluide comprimé.The fluid compressor used according to the invention achieves very high speeds of rotation, between 100,000 rpm and 1,000,000 rpm. These very high speeds make it possible to provide a fluid compressor of smaller dimensions for the same power, allowing its integration into the chassis of a machine. Any connection of the machine to a compressor belonging to a central network is deleted. Thus, the circuit for supplying the compressed fluid to the functional element is very short. This reduces on the one hand the risk of leakage, and on the other hand avoids the pollution that may occur during the transport of compressed fluid through a central network. This also allows a very fast reaction time of the compressor, so that the latter can operate only at the request of the functional element. When no compressed fluid is requested by the functional element 53, the fluid compressor 1 is at a standstill so that there is no energy consumption during this rest period, hence a reduction in the overall energy consumption of the machine. In addition, the fluid compressor used according to the invention operates without agent of lubrication, so that no lubricant will pollute the compressed fluid.

La machine selon l'invention peut être utilisée dans de nombreuses applications, telles que des applications industrielles, médicales, pharmaceutiques, alimentaires, automobiles, notamment pour l'apport d'air comprimé, ou des applications frigorifiques, de chauffage ou de climatisation, pour l'apport de fluide comprimé.The machine according to the invention can be used in many applications, such as industrial applications, medical, pharmaceutical, food, automotive, including for the supply of compressed air, or refrigeration applications, heating or air conditioning, for the supply of compressed fluid.

Claims (13)

Machine (50) comprenant un châssis (52) comprenant au moins un élément fonctionnel (53) et une unité de pilotage (54), caractérisée en ce que ladite machine comprend un compresseur de fluide (1) intégré dans le châssis (52), ledit compresseur de fluide (1) comprenant un bâti (2) dans lequel sont montés un stator (4), un rotor (5) interagissant avec ledit stator (4) et comprenant un arbre (6), au moins une turbine (12) portée par ledit arbre (6), un canal d'amenée de fluide (14) vers la turbine (12), et un canal de sortie de fluide comprimé (16), l'arbre (6) du rotor (5) étant monté en rotation sur le bâti (2) autour d'un axe (A) au moyen d'un premier (7) et d'un second (8) paliers, ledit premier (7), respectivement ledit second (8), palier comprenant : - un premier (18), respectivement un second (22), élément sphérique prévu à une première (9), respectivement une seconde (10), extrémité de l'arbre et disposé de manière centrée par rapport à l'axe (A) de l'arbre (6), et - un premier (20), respectivement un deuxième (24), logement prévu dans le bâti (2) présentant la forme d'une calotte disposée de manière centrée par rapport à l'axe (A) de l'arbre (6) et agencée pour supporter ledit premier (18), respectivement ledit second (22), élément sphérique, et en ce que ledit châssis (52) comporte une entrée de fluide agencée pour alimenter le compresseur de fluide (1) et un circuit d'alimentation (56) agencé pour apporter le fluide comprimé à l'élément fonctionnel (53).Machine (50) comprising a frame (52) comprising at least one functional element (53) and a control unit (54), characterized in that said machine comprises a fluid compressor (1) integrated in the chassis (52), said fluid compressor (1) comprising a frame (2) in which are mounted a stator (4), a rotor (5) interacting with said stator (4) and comprising a shaft (6), at least one turbine (12) carried by said shaft (6), a fluid supply channel (14) to the turbine (12), and a compressed fluid outlet channel (16), the shaft (6) of the rotor (5) being mounted in rotation on the frame (2) about an axis (A) by means of a first (7) and a second (8) bearings, said first (7), respectively said second (8) bearing comprising : a first (18), respectively a second (22), spherical element provided at a first (9), respectively a second (10) end of the shaft and arranged centrally with respect to the axis (A) of the tree (6), and - a first (20), respectively a second (24) housing provided in the frame (2) having the shape of a cap disposed centrally relative to the axis (A) of the shaft (6) and arranged to support said first (18), respectively said second (22), spherical element, and in that said frame (52) has a fluid inlet arranged to supply the fluid compressor (1) and a supply circuit (56) arranged to supply the compressed fluid to the functional element (53). Machine selon la revendication 1, caractérisée en ce que le premier logement (20) est prévu dans le canal d'amenée de fluide (14).Machine according to claim 1, characterized in that the first housing (20) is provided in the fluid supply channel (14). Machine selon la revendication 2, caractérisée en ce que ledit premier logement (20) est prévu dans un premier élément-support (26) disposé de manière centrée par rapport à l'axe (A) de l'arbre (6) dans le canal d'amenée de fluide (14), et maintenu aux parois dudit canal d'amenée de fluide (14) au moyen de branches (28) entre lesquelles le fluide peut circuler.Machine according to claim 2, characterized in that said first housing (20) is provided in a first support element (26) arranged centrally with respect to the axis (A) of the shaft (6) in the fluid supply channel (14), and maintained at the walls of said fluid supply channel (14) by means of branches (28) between which the fluid can circulate. Machine selon l'une quelconque des revendications précédentes, caractérisée en ce que le deuxième logement (24) est prévu dans un deuxième élément-support (30) disposé dans le bâti (2) de manière centrée par rapport à l'axe (A) de l'arbre (6) et à l'opposé du premier élément-support (26).Machine according to any one of the preceding claims, characterized in that the second housing (24) is provided in a second support element (30) arranged in the frame (2) centrally with respect to the axis (A) of the shaft (6) and opposite the first support element (26). Machine selon la revendication 4, caractérisée en ce que le deuxième élément-support (30) est monté de manière coulissante dans le bâti (2) et est relié audit bâti (2) par des moyens élastiques (32) agencés pour absorber les variations de jeu entre le rotor (5) et le stator (4).Machine according to claim 4, characterized in that the second support element (30) is slidably mounted in the frame (2) and is connected to said frame (2) by elastic means (32) arranged to absorb the variations of clearance between the rotor (5) and the stator (4). Machine selon l'une des revendications précédentes, caractérisée en ce que le compresseur de fluide (1) comprend au moins deux paliers aérodynamiques (36, 38) prévus sensiblement de chaque côté de l'arbre (6) du rotor (5).Machine according to one of the preceding claims, characterized in that the fluid compressor (1) comprises at least two aerodynamic bearings (36, 38) provided substantially on each side of the shaft (6) of the rotor (5). Machine selon la revendication 6, caractérisée en ce qu'un premier palier aérodynamique (36) est prévu en amont de la turbine (12), ledit premier palier aérodynamique (36) étant porté par un troisième élément-support (40) disposé de manière centrée par rapport à l'axe (A) de l'arbre (6) dans le canal d'amenée de fluide (14), et maintenu aux parois dudit canal d'amenée de fluide (14) au moyen de branches (44) entre lesquelles le fluide peut circuler.Machine according to claim 6, characterized in that a first aerodynamic bearing (36) is provided upstream of the turbine (12), said first aerodynamic bearing (36) being carried by a third support member (40) arranged centered with respect to the axis (A) of the shaft (6) in the fluid supply channel (14), and maintained at the walls of said fluid supply channel (14) by means of branches (44) between which the fluid can flow. Machine selon la revendication 6, caractérisée en ce qu'un premier palier aérodynamique est prévu en aval de la turbine (12).Machine according to claim 6, characterized in that a first aerodynamic bearing is provided downstream of the turbine (12). Machine selon l'une des revendications 6 à 8, caractérisée en ce qu'un deuxième palier aérodynamique (38) est prévu au niveau de l'extrémité de l'arbre (6) du rotor (5), du côté opposé au canal d'amenée de fluide (14).Machine according to one of claims 6 to 8, characterized in that a second aerodynamic bearing (38) is provided at the end of the shaft (6) of the rotor (5), on the opposite side to the air duct. supply of fluid (14). Machine selon l'une des revendications précédentes, caractérisée en ce que au moins l'une des première (9) et seconde (10) extrémités de l'arbre (6) du rotor (5) comprend un troisième logement (29, 34) présentant la forme d'une calotte disposée de manière centrée par rapport à l'axe (A) de l'arbre (6) et agencée pour recevoir ledit élément sphérique (18, 22) monté libre dans ledit troisième logement (29, 34).Machine according to one of the preceding claims, characterized in that at least one of the first (9) and second (10) ends of the shaft (6) of the rotor (5) comprises a third housing (29, 34) having the shape of a cap disposed centrally with respect to the axis (A) of the shaft (6) and arranged to receive said spherical element (18, 22) freely mounted in said third housing (29, 34) . Machine selon l'une des revendications 1 à 9, caractérisée en ce que l'élément sphérique (18, 22) est solidaire d'au moins l'une des première (9) et seconde (10) extrémités de l'arbre (6) du rotor (5).Machine according to one of claims 1 to 9, characterized in that the spherical element (18, 22) is integral with at least one of the first (9) and second (10) ends of the shaft (6). ) of the rotor (5). Machine selon l'une des revendications précédentes, caractérisée en ce que le circuit d'alimentation (56) comprend un réservoir de fluide comprimé (58) et éventuellement un multiplicateur de pression (59) prévu entre le compresseur de fluide (1) et le réservoir de fluide comprimé (58).Machine according to one of the preceding claims, characterized in that the supply circuit (56) comprises a compressed fluid reservoir (58) and optionally a pressure multiplier (59) provided between the fluid compressor (1) and the compressed fluid reservoir (58). Machine selon l'une des revendications précédentes, caractérisée en ce que l'unité de pilotage (54) comprend des moyens d'activation (60) du compresseur de fluide (1) agencés pour activer ledit compresseur de fluide (1) seulement en cas de besoin par l'élément fonctionnel (53).Machine according to one of the preceding claims, characterized in that the control unit (54) comprises activation means (60) of the fluid compressor (1) arranged to activate said fluid compressor (1) only in case as needed by the functional element (53).
EP15163421.9A 2015-04-13 2015-04-13 Machine comprising a compressor Active EP3081817B1 (en)

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SI201531570T SI3081817T1 (en) 2015-04-13 2015-04-13 Machine comprising a compressor
ES15163421T ES2856014T3 (en) 2015-04-13 2015-04-13 Machine equipped with a compressor
PT151634219T PT3081817T (en) 2015-04-13 2015-04-13 Machine comprising a compressor or a pump
PL15163421T PL3081817T3 (en) 2015-04-13 2015-04-13 Machine comprising a compressor
RS20210408A RS61689B1 (en) 2015-04-13 2015-04-13 Machine comprising a compressor
EP15163421.9A EP3081817B1 (en) 2015-04-13 2015-04-13 Machine comprising a compressor
HUE15163421A HUE053996T2 (en) 2015-04-13 2015-04-13 Machine comprising a compressor
PCT/EP2016/055828 WO2016165906A1 (en) 2015-04-13 2016-03-17 Machine equipped with an air compressor or water pump
CN201680021406.5A CN107454927B (en) 2015-04-13 2016-03-17 Machines equipped with air compressors or water pumps
US15/565,791 US10927844B2 (en) 2015-04-13 2016-03-17 Machine equipped with an air compressor or water pump
JP2017553973A JP6694895B2 (en) 2015-04-13 2016-03-17 Machines with air compressors or liquid pumps
HRP20210546TT HRP20210546T1 (en) 2015-04-13 2021-04-06 Machine comprising a compressor

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CN (1) CN107454927B (en)
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HR (1) HRP20210546T1 (en)
HU (1) HUE053996T2 (en)
PL (1) PL3081817T3 (en)
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EP2562298A2 (en) * 2011-08-26 2013-02-27 Maschinenfabrik Rieter Ag Step bearing for a spinning rotor
CN103727043A (en) * 2014-01-03 2014-04-16 顾发华 Two-stage centrifugal compressor and method for providing air for static pressure gas bearings of two-stage centrifugal compressor

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HUE053996T2 (en) 2021-08-30
PT3081817T (en) 2022-06-27
US10927844B2 (en) 2021-02-23
US20180119703A1 (en) 2018-05-03
JP6694895B2 (en) 2020-05-20
CN107454927A (en) 2017-12-08
RS61689B1 (en) 2021-05-31
ES2856014T3 (en) 2021-09-27
SI3081817T1 (en) 2021-08-31
WO2016165906A1 (en) 2016-10-20
EP3081817B1 (en) 2021-01-13
JP2018514687A (en) 2018-06-07
PL3081817T3 (en) 2021-07-12
CN107454927B (en) 2021-04-06
HRP20210546T1 (en) 2021-05-28

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