EP3289222B1 - Electric compressor with improved dynamic sealing system - Google Patents

Electric compressor with improved dynamic sealing system Download PDF

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Publication number
EP3289222B1
EP3289222B1 EP16725189.1A EP16725189A EP3289222B1 EP 3289222 B1 EP3289222 B1 EP 3289222B1 EP 16725189 A EP16725189 A EP 16725189A EP 3289222 B1 EP3289222 B1 EP 3289222B1
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EP
European Patent Office
Prior art keywords
compressor
shaft
seal
wheel
vent hole
Prior art date
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EP16725189.1A
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German (de)
French (fr)
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EP3289222A1 (en
Inventor
Nicolas Martin
Nicolas Renard
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.)
Valeo Systemes de Controle Moteur SAS
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Valeo Systemes de Controle Moteur SAS
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Publication of EP3289222A1 publication Critical patent/EP3289222A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/08—Sealings
    • F04D29/10—Shaft sealings
    • F04D29/102—Shaft sealings especially adapted for elastic fluid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B33/00—Engines characterised by provision of pumps for charging or scavenging
    • F02B33/32—Engines with pumps other than of reciprocating-piston type
    • F02B33/34—Engines with pumps other than of reciprocating-piston type with rotary pumps
    • F02B33/40—Engines with pumps other than of reciprocating-piston type with rotary pumps of non-positive-displacement type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • 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
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B39/00—Component parts, details, or accessories relating to, driven charging or scavenging pumps, not provided for in groups F02B33/00 - F02B37/00
    • F02B39/02—Drives of pumps; Varying pump drive gear ratio
    • F02B39/08—Non-mechanical drives, e.g. fluid drives having variable gear ratio
    • F02B39/10—Non-mechanical drives, e.g. fluid drives having variable gear ratio electric
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/60—Fluid transfer
    • F05D2260/602—Drainage
    • F05D2260/6022—Drainage of leakage having past a seal

Definitions

  • the present invention relates to the field of electric compressors, and more particularly to an electric supercharger comprising a dynamic sealing system.
  • an electric compressor is a device used to supercharge a heat engine, operating with an electric motor. More specifically, the compressor comprises a compressor wheel driven by an electric motor.
  • the electric compressor is placed on the air intake line of an internal combustion engine, in addition to a turbocharger.
  • the electric compressor plays the same role as the turbocharger, namely to increase the intake pressure of the fresh gases in the engine, but is used in particular during transient phases to overcome the problems of response time of the turbocharger.
  • a dynamic sealing system is installed between the compressor wheel and the electric motor.
  • This system is made up of two segments.
  • a vent hole known from the patent application UK1312334.4 , is added between the two segments, in order to avoid the accumulation of any pollutants which may have passed through the first segment.
  • the vent hole is connected to the inlet of the turbocharger via a hose, which creates a slight depression in order to purge the vent hole.
  • the vent hole is thus connected to an area which is generally under depression. This is necessary for the protection of the electric motor and its bearings to be effective.
  • the pollutants which have accumulated in the vent hole can pass through the 2 nd segment. This results in a risk of pollution of the compressor and more particularly of the ball bearing, which can reduce its service life.
  • the object of the present invention is therefore to overcome one or more of the drawbacks of the devices of the prior art by proposing an electric compressor whose sealing system is improved and thus makes it possible to avoid pollution of the bearings.
  • the present invention proposes an electric compressor according to claim 1.
  • the seal makes it possible at least to avoid the accumulation of pollutant at the level of the vent hole and also makes it possible to avoid the purging of the internal grease of the bearing under the suction effect through the vent hole.
  • the objective of this baffling is to maximize the pressure drop between the compressor wheel and the segment arranged on the side of the wheel. In this way, the accumulation of pollutants between the 2 segments is reduced. And the need for evacuation through the vent hole is then less.
  • This groove makes it possible to collect the droplets of pollutant such as in particular oil and to centrifuge them, in order to prevent them from reaching the segment arranged on the side of the wheel.
  • the air at the level of the segment arranged on the side of the wheel is thus freed from some of the pollutants.
  • the seal is arranged on a face of the bearings perpendicular to a longitudinal axis X of the shaft of the compressor, on the face facing the segments.
  • the seal is a friction seal.
  • the seal is made of elastomer.
  • the baffling is carried out at the level of the contact between an additional part fixed circularly to the shaft, and the body of the compressor.
  • the opening of the groove is formed outwards, that is to say in the direction opposite to the shaft.
  • the groove is formed in the additional part.
  • the compressor is an electric compressor for supercharging a heat engine.
  • the present invention relates to an electric compressor equipped with an improved dynamic sealing system.
  • the dynamic sealing system is formed by at least two segments between which opens a vent hole.
  • the term “electric compressor” means an air compressor, volumetric or not and for example centrifugal or radial, driven by an electric motor, with the aim of supercharging a heat engine.
  • the electric motor is a DC or AC asynchronous motor.
  • the motor comprises a rotor and a stator.
  • the electric motor is a variable reluctance motor (also called SRM machine for Switched Reluctance Motor according to the English terminology).
  • the stator comprises a body consisting of a stack of thin sheets forming a crown, also called a stack of sheets, the inner face of which is provided with notches open inwards to receive windings phase which form a winding.
  • the rotor has permanent magnets.
  • the figure 1 illustrates an internal combustion engine with three cylinders 1 associated with a device 3 for the intake gas supply according to one embodiment of the invention.
  • the supply device 3 (marked by a dotted line) comprises a turbocharger 5.
  • the supply device 3 comprises an exhaust gas recirculation valve 6.
  • the supply device 3 comprises a charge air cooler 7.
  • the supply device 3 comprises an electric compressor 9 and a compressor bypass valve 10.
  • the turbocharger 5 is fed by the exhaust gases from the engine 1 and by air arriving via an air inlet 8. A part of the exhaust gases is recycled to the inlet of the engine 1 via a valve 6 for recirculating the exhaust gases.
  • the gases from the compressor of the turbocharger 5 are then cooled by the cooler 7 and then supply the electric compressor 9.
  • the cooler is arranged downstream of the electric compressor 9.
  • the electric compressor 9 compresses the gases coming from the turbocharger 5 and supplies the motor 1.
  • the electric compressor 9, illustrated in the figure 2 and 3 includes an electric motor (not visible picture 2 ), and bearings 16 arranged circularly around the shaft.
  • the electric motor allows the rotation of a shaft 13 of the electric compressor via the bearings 16.
  • the shaft 13 thus drives in rotation the wheel 14 of the compressor 9. More precisely one end of the shaft 13 is driven in rotation by the electric motor, and another end of the shaft 13 rotates the wheel 14 of the compressor.
  • the intermediate part of the shaft is protected by the body 17 of the compressor.
  • This intermediate part of the shaft comprises a sealing system, and more precisely a dynamic sealing system.
  • This member is formed of a first sealing segment 29a positioned on the side of the wheel 14 of the compressor and a second sealing segment 29b positioned on the side of the bearings 16. These segments have the role of protecting the bearings from the pollution that may come from the wheel 14 of the compressor.
  • Each of the sealing segments 29a, b is arranged in a recess.
  • the two recesses are formed, that is to say machined, directly in the shaft 13.
  • the two recesses 19a, b are formed in an additional part 131 fixed to the shaft 13.
  • the additional part has the shape of a ring in which the recesses 19a, b are cut. It is placed against a flat wall of the shaft 13 or in another recess 132 hollowed out in the shaft 13. This other recess 132 is configured in such a way as to allow easy insertion of the additional part 131 on the shaft 13.
  • the additional part 131 is formed in a single part or in two parts, not shown.
  • vent hole 31 is added between the two segments in order to avoid the accumulation of any pollutants which would have crossed the first segment 29a.
  • the vent hole 31 is connected to the inlet of the turbocharger.
  • the vent hole 31 is connected to the turbocharger, for example via a hose, which makes it possible to create a slight depression in order to purge the vent hole.
  • the vent hole 31 thus passes through part of the compressor.
  • the vent hole 31, more precisely the circuit of the vent hole extends outside the compressor.
  • the vent hole 31 thus makes it possible to avoid pollution of the bearings 16 by allowing the evacuation of the pollutants thanks to a pressure difference between the pressure of the compartment formed between the two sealing segments 29a, 29b and the pressure at the outlet of the vent hole 35.
  • the pressure between the two segments 29a, 29b being greater than the pressure at the outlet 35 of the vent hole.
  • accumulation zone is meant the portion of the circuit of the vent hole 31 between the inlet 37 of the vent hole and the outlet 35 of the vent hole.
  • inlet and outlet are defined with respect to the direction of circulation of the flow, in the vent hole, going from the sealing compartment towards the outside of the compressor.
  • the invention provides at least one seal 100 for protecting at least one bearing.
  • This seal 100 is arranged on one side of the bearing, perpendicular to the longitudinal axis X of the shaft 13 of the compressor. More precisely, the seal 100 is arranged on the face of the bearing facing the segments 29a, b. This joint 100 also makes it possible to protect the electric motor.
  • the seal 100 is located between the balls 165 of the bearing and the segments 29a, b.
  • the gasket 100 comprises at least one part made of elastomer.
  • the entire joint 100 is made of elastomer.
  • the joint 100 is composed of a reinforcement, for example metallic and more precisely of steel.
  • This reinforcement is covered with an elastomer, for example by overmoulding.
  • the elastomer used is of the NBR type (for nitrile butadiene rubber according to English terminology) or FKM (fluoropolymer) or PTFE (polytetrafluoroethylene) or EPDM (ethylene-propylene-diene monomer) or HNBR (butadiene- hydrogenated acrylonitrile) or AEM (ethylene acrylic) or ACM (copolymer of acrylic acid ester and 2-chloroethyl vinyl ether according to the English terminology).
  • NBR for nitrile butadiene rubber according to English terminology
  • FKM fluoropolymer
  • PTFE polytetrafluoroethylene
  • EPDM ethylene-propylene-diene monomer
  • HNBR butadiene- hydrogenated acrylonitrile
  • AEM ethylene acrylic
  • ACM copolymer of acrylic acid ester and 2-chloroethyl vinyl ether according to the English terminology
  • the seal is rigidly coupled to the outer ring 166 of the bearing and achieves a static seal at its interface with said outer ring.
  • the seal 100 comprises at least one lip (not shown).
  • the seal 100 has two lips. This or these lips rub against the inner ring 164 of the bearing, thus achieving dynamic sealing.
  • the lip(s) are oriented radially, that is to say they rub on a cylindrical zone.
  • the lip or lips are oriented axially, that is to say they rub against a plane perpendicular to the axis X of rotation of the shaft and therefore of the bearing.
  • one lip is oriented radially and another lip is oriented axially.
  • the geometry and the material of the lip(s) are chosen to limit friction, with for example friction generating a maximum torque equal to 15Nmm, preferably less than 10Nmm, while ensuring sealing under differential pressures of up to 4 bar.
  • This seal 100 makes it possible to protect the bearing and the balls 165 of the bearing from pollutants which may contaminate its internal grease.
  • the seal 100 also makes it possible to avoid the bleeding of the internal grease of the bearing under the suction effect through the vent hole.
  • the invention provides a baffle 200 upstream of the segment 29a arranged on the side of the wheel 14.
  • the baffle is formed by at least one baffle.
  • chicane is meant a circular passage for the air which is not rectilinear. The air comes from the wheel compartment 14 compressor. This air passage is formed so as to emerge between the wheel 14 and the segment 29a arranged on the side of the wheel 14.
  • the baffle 200 is formed directly in the body 140 of the compressor. More precisely, the baffling 200 is achieved by means of specific shapes arranged in the body 140 of the compressor.
  • the baffling 200 is achieved by means of specific shapes arranged in the body 140 and the additional part 131, at the level of the border common to these two parts in order to create a non-rectilinear path for the air. These forms are complementary.
  • the presence of the additional part 131 makes it possible to simplify the mounting of the bearing and to increase the contact surface with the wheel 14.
  • the increase in the contact surface of the wheel with the additional part makes it possible to avoid caulking or deformation of the wheel 14.
  • the wheel 14 is made of a softer material than the additional part 131 and the shaft 13.
  • the wheel 14 is made of aluminum and the additional part 131 and shaft 13 are made of steel.
  • the baffle 200 is composed of at least 2 segments oriented in different directions, at least one radial direction and at least one axial direction.
  • the baffle 200 is composed of several rectilinear segments 201 . This configuration forces the airflow to change direction, going from a radial direction to an axial direction, or vice versa.
  • the baffle 200 comprises at least 6 segments 201, therefore 5 changes of direction. Changes in direction create head loss, i.e. a loss of pressure along the path. This loss of pressure leads to a reduction in flow.
  • each segment 201 In order to increase the pressure drop, the section and the length of each segment 201 are chosen so that the section/length ratio of each segment is as low as possible. Indeed, the lower this ratio, the greater the pressure drop, because the smaller the section and the longer the path and the more difficult it is for the air to circulate. The length of each segment 201 is thus maximized, taking into account the space constraints.
  • each segment 201 measures, for example, between 1 mm and 5 mm, and preferably between 1 and 3 mm long in the radial direction or in the axial direction or obliquely.
  • the clearance between the body 140 and the additional part 131 must be minimized, taking into account the manufacturing and positioning tolerances of the various components.
  • This play is for example less than 0.5 mm, preferably less than 0.25 mm in the radial direction and less than 0.75 mm, preferably less than 0.5 mm in the axial direction.
  • the section evolves, that is to say increases and then decreases significantly in order to create turbulence to limit the flow.
  • this baffling 200 is to maximize the pressure drop between the wheel of the compressor and the segment 29a placed on the side of the wheel 14.
  • the flow rate in this zone, as well as the pressure upstream of the segment 29a placed on the side of wheel 14 are then reduced. Leakage through this segment is then reduced. In this way, the accumulation of pollutants between the 2 segments is reduced. And the need for evacuation through the vent hole is then less.
  • the baffle 200 is formed directly in the body 140 of the compressor.
  • the invention provides a groove 300 upstream of the baffle 200.
  • groove 300 is meant a groove of generally semi-circular shape, arranged circularly with respect to the axis of the shaft 13.
  • the opening 301 of the groove 300 is formed outwards, that is to say in the direction opposite to the shaft.
  • the groove is formed in the additional part 131.
  • the groove is defined by a torus-shaped recess, around the shaft, disposed at a distance from the shaft defined by the length of chicanery.
  • the mean diameter Di of the toroidal shape, and therefore of the groove is between 10 mm and 20 mm.
  • the proper diameter Dp of the toric shape, ie the diameter Dp of the groove defined parallel to the axis X of the shaft is between 1 and 2 mm.
  • This groove 300 makes it possible to collect the droplets of pollutant such as in particular oil and to centrifuge them, in order to prevent them from reaching the segment 29a arranged on the side of the wheel 14. The air at the level of the segment 29a disposed on the side of the wheel 14 is thus freed from some of the pollutants.
  • the invention provides for the association of the three variants described previously. More specifically, the compressor according to the invention comprises at least one seal 100 for protecting at least one bearing, a baffle 200 between the wheel 14 and the segment 29a arranged on the side of the wheel 14, and a groove 300 upstream of chicanery.
  • the compressor according to the invention is thus configured so as to protect the bearings, and also the electric motor, against pollutants such as oil, recirculating gases or any other pollutants.
  • pollutants such as oil, recirculating gases or any other pollutants.
  • the improved sealing of this system makes it possible to reduce the need for vacuum in the vent hole and even to allow a slight overpressure. For example, the seal is maintained under an overpressure of the vent hole of 50mbar compared to atmospheric pressure

Description

La présente invention concerne le domaine des compresseurs électriques, et plus particulièrement un compresseur électrique de suralimentation comportant un système d'étanchéité dynamique.The present invention relates to the field of electric compressors, and more particularly to an electric supercharger comprising a dynamic sealing system.

Dans le cadre de l'invention, un compresseur électrique est un dispositif, utilisé pour suralimenter un moteur thermique, fonctionnant avec un moteur électrique. Plus précisément, le compresseur comporte une roue de compresseur entrainée par un moteur électrique.In the context of the invention, an electric compressor is a device used to supercharge a heat engine, operating with an electric motor. More specifically, the compressor comprises a compressor wheel driven by an electric motor.

Le compresseur électrique est placé sur la ligne d'admission d'air d'un moteur à combustion interne, en complément d'un turbocompresseur. Le compresseur électrique joue le même rôle que le turbocompresseur, à savoir augmenter la pression d'admission des gaz frais dans le moteur, mais est utilisé notamment lors des phases transitoires pour palier aux problèmes de temps de réponse du turbocompresseur.The electric compressor is placed on the air intake line of an internal combustion engine, in addition to a turbocharger. The electric compressor plays the same role as the turbocharger, namely to increase the intake pressure of the fresh gases in the engine, but is used in particular during transient phases to overcome the problems of response time of the turbocharger.

Afin de protéger le moteur électrique et ses roulements d'un air pouvant contenir différents polluants (huile, gaz de recirculation...), un système d'étanchéité dynamique est mis en place entre la roue du compresseur et le moteur électrique. Ce système est composé de deux segments. Un trou d'évent, connu de la demande de brevet UK1312334.4 , est ajouté entre les deux segments, afin d'éviter l'accumulation des éventuels polluants qui auraient traversé le premier segment. Pour plus d'efficacité, le trou d'évent est relié à l'entrée du turbocompresseur par l'intermédiaire d'une durite ce qui permet de créer une légère dépression afin de purger le trou d'évent.In order to protect the electric motor and its bearings from air that may contain various pollutants (oil, recirculating gas, etc.), a dynamic sealing system is installed between the compressor wheel and the electric motor. This system is made up of two segments. A vent hole, known from the patent application UK1312334.4 , is added between the two segments, in order to avoid the accumulation of any pollutants which may have passed through the first segment. For greater efficiency, the vent hole is connected to the inlet of the turbocharger via a hose, which creates a slight depression in order to purge the vent hole.

Dans ce type de dispositif, le trou d'évent est ainsi relié à une zone qui est généralement en dépression. Cela est nécessaire pour que la protection du moteur électrique et de ses roulements soit efficace. Cependant, dans certains cas de fonctionnement, et par exemple, lorsque le moteur thermique est éteint, les polluants qui se sont accumulés dans le trou d'évent peuvent traverser le 2ème segment. Il en résulte un risque de pollution du compresseur et plus particulièrement du roulement à billes pouvant réduire sa durée de vie.In this type of device, the vent hole is thus connected to an area which is generally under depression. This is necessary for the protection of the electric motor and its bearings to be effective. However, in certain operating cases, and for example, when the internal combustion engine is off, the pollutants which have accumulated in the vent hole can pass through the 2 nd segment. This results in a risk of pollution of the compressor and more particularly of the ball bearing, which can reduce its service life.

Un autre système d'étanchéité dans un compresseur électrique est divulgué dans le document US 3,909,154 A .Another sealing system in an electric compressor is disclosed in document US 3,909,154A .

La présente invention a donc pour objet de pallier un ou plusieurs des inconvénients des dispositifs de l'art antérieur en proposant un compresseur électrique dont le système d'étanchéité est amélioré et permet ainsi d'éviter la pollution des roulements.The object of the present invention is therefore to overcome one or more of the drawbacks of the devices of the prior art by proposing an electric compressor whose sealing system is improved and thus makes it possible to avoid pollution of the bearings.

Pour cela la présente invention propose un compresseur électrique selon la revendication 1.For this, the present invention proposes an electric compressor according to claim 1.

Le joint permet au moins d'éviter l'accumulation de polluant au niveau du trou d'évent et permet également d'éviter la purge de la graisse interne du roulement sous l'effet d'aspiration par le trou d'évent.The seal makes it possible at least to avoid the accumulation of pollutant at the level of the vent hole and also makes it possible to avoid the purging of the internal grease of the bearing under the suction effect through the vent hole.

L'objectif de ce chicanage est de maximiser la perte de charge entre la roue du compresseur et le segment disposé du coté de la roue. De cette façon, l'accumulation de polluants entre les 2 segments est réduite. Et le besoin d'évacuation par le trou d'évent est alors moindre.The objective of this baffling is to maximize the pressure drop between the compressor wheel and the segment arranged on the side of the wheel. In this way, the accumulation of pollutants between the 2 segments is reduced. And the need for evacuation through the vent hole is then less.

Cette gorge permet de recueillir les gouttelettes de polluant tels que notamment l'huile et de les centrifuger, afin d'éviter qu'elles n'atteignent le segment disposé du coté de la roue. L'air au niveau du segment disposé du coté de la roue est ainsi débarrassée d'une partie des polluants.This groove makes it possible to collect the droplets of pollutant such as in particular oil and to centrifuge them, in order to prevent them from reaching the segment arranged on the side of the wheel. The air at the level of the segment arranged on the side of the wheel is thus freed from some of the pollutants.

Selon un mode de réalisation de l'invention, le joint est disposé sur une face des roulements perpendiculaire à un axe X longitudinal de l'arbre du compresseur, sur la face orientée vers les segments.According to one embodiment of the invention, the seal is arranged on a face of the bearings perpendicular to a longitudinal axis X of the shaft of the compressor, on the face facing the segments.

Selon un mode de réalisation de l'invention, le joint est un joint frottant.According to one embodiment of the invention, the seal is a friction seal.

Selon un mode de réalisation de l'invention, le joint est en élastomère.According to one embodiment of the invention, the seal is made of elastomer.

Selon un mode de réalisation de l'invention, le chicanage est réalisé au niveau du contact entre une pièce supplémentaire fixée circulairement à l'arbre, et le corps du compresseur.According to one embodiment of the invention, the baffling is carried out at the level of the contact between an additional part fixed circularly to the shaft, and the body of the compressor.

Selon un mode de réalisation de l'invention,, l'ouverture de la gorge est formée vers l'extérieur, c'est à dire dans la direction opposée à l'arbre.According to one embodiment of the invention, the opening of the groove is formed outwards, that is to say in the direction opposite to the shaft.

Selon un mode de réalisation de l'invention, la gorge est formée dans la pièce supplémentaire.According to one embodiment of the invention, the groove is formed in the additional part.

Selon un mode de réalisation de l'invention, le compresseur est un compresseur électrique de suralimentation de moteur thermique.According to one embodiment of the invention, the compressor is an electric compressor for supercharging a heat engine.

D'autres buts, caractéristiques et avantages de l'invention seront mieux compris et apparaîtront plus clairement à la lecture de la description faite, ci-après, en se référant aux figures annexées, données à titre d'exemple et dans lesquelles:

  • la figure 1 est une représentation schématique montrant un ensemble moteur intégrant un système selon une réalisation de l'invention,
  • la figure 2 est une représentation schématique d'une vue en coupe d'une partie d'un compresseur intégrant un système d'étanchéité,
  • la figure 3 est une représentation schématique d'une vue en coupe d'un détail A de la figure 2 d'un compresseur intégrant un système d'étanchéité amélioré selon l'invention.
Other aims, characteristics and advantages of the invention will be better understood and will appear more clearly on reading the description given below, with reference to the appended figures, given by way of example and in which:
  • the figure 1 is a schematic representation showing an engine assembly incorporating a system according to one embodiment of the invention,
  • the figure 2 is a schematic representation of a sectional view of part of a compressor incorporating a sealing system,
  • the picture 3 is a schematic representation of a sectional view of a detail A of the picture 2 of a compressor incorporating an improved sealing system according to the invention.

La présente invention concerne un compresseur électrique équipé d'un système d'étanchéité dynamique amélioré. Dans le cadre de l'invention, le système d'étanchéité dynamique est formé par au moins deux segments entre lesquels débouche un trou d'évent.The present invention relates to an electric compressor equipped with an improved dynamic sealing system. In the context of the invention, the dynamic sealing system is formed by at least two segments between which opens a vent hole.

Dans le cadre de l'invention, on entend par compresseur électrique, un compresseur d'air, volumétrique ou non et par exemple centrifuge ou radial, entraîné par un moteur électrique, dans le but de suralimenter un moteur thermique. Selon un mode de réalisation de l'invention, le moteur électrique est un moteur asynchrone à courant continu ou alternatif.In the context of the invention, the term “electric compressor” means an air compressor, volumetric or not and for example centrifugal or radial, driven by an electric motor, with the aim of supercharging a heat engine. According to a mode embodiment of the invention, the electric motor is a DC or AC asynchronous motor.

Le moteur comporte un rotor et un stator.The motor comprises a rotor and a stator.

Selon un mode de réalisation de l'invention, le moteur électrique est un moteur à reluctance variable (également appelée machine SRM pour Switched Reluctance Motor selon la terminologie anglaise).According to one embodiment of the invention, the electric motor is a variable reluctance motor (also called SRM machine for Switched Reluctance Motor according to the English terminology).

Selon un mode de réalisation de l'invention, le stator comporte un corps constitué par un empilage de tôles minces formant une couronne, encore appelé paquet de tôles, dont la face intérieure est pourvue d'encoches ouvertes vers l'intérieur pour recevoir des enroulements de phase qui forment un bobinage.According to one embodiment of the invention, the stator comprises a body consisting of a stack of thin sheets forming a crown, also called a stack of sheets, the inner face of which is provided with notches open inwards to receive windings phase which form a winding.

Selon un mode de réalisation de l'invention, le rotor est à aimants permanents.According to one embodiment of the invention, the rotor has permanent magnets.

La figure 1 illustre un moteur à combustion interne avec trois cylindres 1 associé à un dispositif 3 pour l'alimentation en gaz d'admission conformément à une réalisation de l'invention. Selon un mode de réalisation de l'invention, le dispositif d'alimentation 3 (marquée par une ligne pointillée) comprend un turbocompresseur 5.The figure 1 illustrates an internal combustion engine with three cylinders 1 associated with a device 3 for the intake gas supply according to one embodiment of the invention. According to one embodiment of the invention, the supply device 3 (marked by a dotted line) comprises a turbocharger 5.

Selon un mode de réalisation de l'invention, le dispositif d'alimentation 3 comprend une vanne de recirculation des gaz d'échappement 6.According to one embodiment of the invention, the supply device 3 comprises an exhaust gas recirculation valve 6.

Selon un mode de réalisation de l'invention, le dispositif d'alimentation 3 comprend un refroidisseur d'air de suralimentation 7.According to one embodiment of the invention, the supply device 3 comprises a charge air cooler 7.

Selon un mode de réalisation de l'invention, le dispositif d'alimentation 3 comprend un compresseur électrique 9 et une vanne de dérivation du compresseur 10.According to one embodiment of the invention, the supply device 3 comprises an electric compressor 9 and a compressor bypass valve 10.

Le turbocompresseur 5 est alimenté par les gaz d'échappement du moteur 1 et par de l'air arrivant par une entrée d'air 8. Une partie des gaz d'échappement est recyclé à l'entrée du moteur 1 par l'intermédiaire d'une vanne 6 de recirculation des gaz d'échappement.The turbocharger 5 is fed by the exhaust gases from the engine 1 and by air arriving via an air inlet 8. A part of the exhaust gases is recycled to the inlet of the engine 1 via a valve 6 for recirculating the exhaust gases.

Les gaz issus du compresseur du turbocompresseur 5 sont ensuite refroidis par le refroidisseur 7 puis alimentent le compresseur électrique 9.The gases from the compressor of the turbocharger 5 are then cooled by the cooler 7 and then supply the electric compressor 9.

Selon un autre mode de réalisation de l'invention non illustrée, le refroidisseur est disposé en aval du compresseur électrique 9. Le compresseur électrique 9 compresse les gaz issus du turbocompresseur 5 et alimente le moteur 1.According to another embodiment of the invention not illustrated, the cooler is arranged downstream of the electric compressor 9. The electric compressor 9 compresses the gases coming from the turbocharger 5 and supplies the motor 1.

Le compresseur électrique 9, illustré dans les figures 2 et 3, comprend un moteur électrique (non visible figure 2), et des roulements 16 disposés circulairement autour de l'arbre. Le moteur électrique permet la mise en rotation d'un arbre 13 du compresseur électrique via les roulements 16. L'arbre 13 entraine ainsi en rotation la roue 14 du compresseur 9. Plus précisément une extrémité de l'arbre 13 est entrainée en rotation par le moteur électrique, et une autre extrémité de l'arbre 13 entraine en rotation la roue 14 du compresseur. La partie intermédiaire de l'arbre est protégé par le corps 17 de compresseur. Cette partie intermédiaire de l'arbre comporte un système d'étanchéité, et plus précisément un système d'étanchéité dynamique. Cet organe est formé d'un premier segment d'étanchéité 29a positionné du coté de la roue 14 du compresseur et d'un deuxième segment d'étanchéité 29b positionné du coté des roulements 16. Ces segments ont pour rôle de protéger les roulements de la pollution pouvant provenir de la roue 14 du compresseur.The electric compressor 9, illustrated in the figure 2 and 3 , includes an electric motor (not visible picture 2 ), and bearings 16 arranged circularly around the shaft. The electric motor allows the rotation of a shaft 13 of the electric compressor via the bearings 16. The shaft 13 thus drives in rotation the wheel 14 of the compressor 9. More precisely one end of the shaft 13 is driven in rotation by the electric motor, and another end of the shaft 13 rotates the wheel 14 of the compressor. The intermediate part of the shaft is protected by the body 17 of the compressor. This intermediate part of the shaft comprises a sealing system, and more precisely a dynamic sealing system. This member is formed of a first sealing segment 29a positioned on the side of the wheel 14 of the compressor and a second sealing segment 29b positioned on the side of the bearings 16. These segments have the role of protecting the bearings from the pollution that may come from the wheel 14 of the compressor.

Chacun des segments d'étanchéités 29a, b est disposé dans un évidement.Each of the sealing segments 29a, b is arranged in a recess.

Selon un mode de réalisation du système selon l'invention non illustré, les deux évidements sont formés, c'est-à-dire usiné, directement dans l'arbre 13.According to an embodiment of the system according to the invention not illustrated, the two recesses are formed, that is to say machined, directly in the shaft 13.

Selon un autre mode de réalisation du système de l'invention illustré dans la figure 3, les deux évidements 19a, b sont formés dans une pièce supplémentaire 131 fixée à l'arbre 13. La pièce supplémentaire a la forme d'une bague dans laquelle sont creusés les évidements 19a, b. Elle est disposée contre une paroi plane de l'arbre 13 ou dans un autre évidement 132 creusé dans l'arbre 13. Cet autre évidement 132 est configuré de façon à permettre une insertion facile de la pièce supplémentaire 131 sur l'arbre 13.According to another embodiment of the system of the invention illustrated in the picture 3 , the two recesses 19a, b are formed in an additional part 131 fixed to the shaft 13. The additional part has the shape of a ring in which the recesses 19a, b are cut. It is placed against a flat wall of the shaft 13 or in another recess 132 hollowed out in the shaft 13. This other recess 132 is configured in such a way as to allow easy insertion of the additional part 131 on the shaft 13.

Selon un mode de réalisation du système selon l'invention, la pièce supplémentaire 131 est formée en une seule partie ou en deux parties non illustrées.According to one embodiment of the system according to the invention, the additional part 131 is formed in a single part or in two parts, not shown.

Entre les deux segments d'étanchéités 29a, 29b est positionnée l'entrée 37 d'un trou d'évent 31. Le trou d'évent 31 est ajouté entre les deux segments afin d'éviter l'accumulation des éventuels polluants qui auraient traversé le premier segment 29a. Selon un mode de réalisation de l'invention, pour plus d'efficacité, le trou d'évent 31 est relié à l'entrée du turbocompresseur. Selon un mode de réalisation, le trou d'évent 31 est relié au turbocompresseur par exemple par l'intermédiaire d'une durite ce qui permet de créer une légère dépression afin de purger le trou d'évent. Le trou d'évent 31 traverse ainsi une partie du compresseur. Selon un mode de réalisation de l'invention, le trou d'évent 31, plus précisément le circuit du trou d'évent, se prolonge en dehors du compresseur. Le trou d'évent 31 permet ainsi d'éviter la pollution des roulements 16 en permettant l'évacuation des polluants grâce à une différence de pression entre la pression du compartiment formé entre les deux segments d'étanchéité 29a, 29b et la pression à la sortie du trou d'évent 35. La pression entre les deux segments 29a, 29b étant supérieure à la pression en sortie 35 du trou d'évent.Between the two sealing segments 29a, 29b is positioned the inlet 37 of a vent hole 31. The vent hole 31 is added between the two segments in order to avoid the accumulation of any pollutants which would have crossed the first segment 29a. According to one embodiment of the invention, for greater efficiency, the vent hole 31 is connected to the inlet of the turbocharger. According to one embodiment, the vent hole 31 is connected to the turbocharger, for example via a hose, which makes it possible to create a slight depression in order to purge the vent hole. The vent hole 31 thus passes through part of the compressor. According to one embodiment of the invention, the vent hole 31, more precisely the circuit of the vent hole, extends outside the compressor. The vent hole 31 thus makes it possible to avoid pollution of the bearings 16 by allowing the evacuation of the pollutants thanks to a pressure difference between the pressure of the compartment formed between the two sealing segments 29a, 29b and the pressure at the outlet of the vent hole 35. The pressure between the two segments 29a, 29b being greater than the pressure at the outlet 35 of the vent hole.

Dans certains cas d'utilisation du compresseur, et par exemple, lorsque le moteur thermique est éteint, les polluants qui se sont accumulés dans une zone d'accumulation du trou d'évent peuvent traverser le 2ème segment et atteindre les roulements à billes. Dans le cadre de l'invention, on entend par zone d'accumulation la portion du circuit du trou d'évent 31 entre l'entrée 37 du trou d'évent et la sortie 35 du trou d'évent.In certain cases of use of the compressor, and for example, when the internal combustion engine is off, the pollutants which have accumulated in an accumulation zone of the vent hole can cross the 2 nd segment and reach the ball bearings. In the context of the invention, by accumulation zone is meant the portion of the circuit of the vent hole 31 between the inlet 37 of the vent hole and the outlet 35 of the vent hole.

Dans le cadre de l'invention, les termes entrée et sortie sont définis par rapport au sens de circulation du flux, dans le trou d'évent, allant du compartiment d'étanchéité vers l'extérieur du compresseur.In the context of the invention, the terms inlet and outlet are defined with respect to the direction of circulation of the flow, in the vent hole, going from the sealing compartment towards the outside of the compressor.

Afin d'éviter ce phénomène de pollution, selon une variante de réalisation, l'invention prévoit au moins un joint 100 de protection d'au moins un roulement. Ce joint 100 est disposé sur une face, du roulement, perpendiculaire à l'axe X longitudinale de l'arbre 13 du compresseur. Plus précisément, le joint 100 est disposé sur la face du roulement orientée vers les segments 29a, b. Ce joint 100 permet également de protéger le moteur électrique.In order to avoid this pollution phenomenon, according to a variant embodiment, the invention provides at least one seal 100 for protecting at least one bearing. This seal 100 is arranged on one side of the bearing, perpendicular to the longitudinal axis X of the shaft 13 of the compressor. More precisely, the seal 100 is arranged on the face of the bearing facing the segments 29a, b. This joint 100 also makes it possible to protect the electric motor.

Selon un mode de réalisation de l'invention, le joint 100 est situé entre les billes 165 du roulement et les segments 29a, b.According to one embodiment of the invention, the seal 100 is located between the balls 165 of the bearing and the segments 29a, b.

Dans le cadre de l'invention, le joint 100 comprend au moins une partie en élastomère.In the context of the invention, the gasket 100 comprises at least one part made of elastomer.

Selon un premier mode de réalisation, la totalité du joint 100 est en élastomère.According to a first embodiment, the entire joint 100 is made of elastomer.

Selon un deuxième mode de réalisation de l'invention, le joint 100 est composé d'une armature, par exemple métallique et plus précisément en acier. Cette armature est recouverte d'un élastomère, par exemple par surmoulage.According to a second embodiment of the invention, the joint 100 is composed of a reinforcement, for example metallic and more precisely of steel. This reinforcement is covered with an elastomer, for example by overmoulding.

Dans le cadre de l'invention l'élastomère utilisé est de type NBR (pour nitrile butadiene rubber selon la terminologie anglaise) ou FKM (fluoropolymère) ou PTFE (polytétrafluoroéthylène) ou EPDM (éthylène-propylène-diène monomère) ou HNBR (butadiène-acrylonitrile hydrogénés) ou AEM (éthylène acrylique) ou ACM (copolymer of acrylic acid ester and 2-chloroethyl vinyl ether selon la terminologie anglaise).In the context of the invention, the elastomer used is of the NBR type (for nitrile butadiene rubber according to English terminology) or FKM (fluoropolymer) or PTFE (polytetrafluoroethylene) or EPDM (ethylene-propylene-diene monomer) or HNBR (butadiene- hydrogenated acrylonitrile) or AEM (ethylene acrylic) or ACM (copolymer of acrylic acid ester and 2-chloroethyl vinyl ether according to the English terminology).

Selon un mode de réalisation de l'invention, le joint est couplé rigidement à la bague externe 166 du roulement et réalise une étanchéité statique au niveau de son interface avec ladite bague externe.According to one embodiment of the invention, the seal is rigidly coupled to the outer ring 166 of the bearing and achieves a static seal at its interface with said outer ring.

Selon un mode de réalisation de l'invention, le joint 100 comporte au moins une lèvre (non illustrée). Selon un autre mode de réalisation, le joint 100 comporte deux lèvres. Cette ou ces lèvres frottent sur la bague interne 164 du roulement réalisant ainsi une étanchéité dynamique. Selon un mode de réalisation, la ou les lèvres sont orientées radialement, c'est-à-dire qu'elles frottent sur une zone cylindrique. Selon un mode de réalisation, la ou les lèvres sont orientées axialement, c'est-à-dire qu'elles frottent sur un plan perpendiculaire à l'axe X de rotation de l'arbre et donc du roulement. Selon un mode de réalisation de l'invention, une lèvre est orientée radialement et une autre lèvre est orientée axialement.According to one embodiment of the invention, the seal 100 comprises at least one lip (not shown). According to another embodiment, the seal 100 has two lips. This or these lips rub against the inner ring 164 of the bearing, thus achieving dynamic sealing. According to one embodiment, the lip(s) are oriented radially, that is to say they rub on a cylindrical zone. According to one embodiment, the lip or lips are oriented axially, that is to say they rub against a plane perpendicular to the axis X of rotation of the shaft and therefore of the bearing. According to one embodiment of the invention, one lip is oriented radially and another lip is oriented axially.

La géométrie et le matériau de la ou des lèvres sont choisis pour limiter le frottement, avec par exemple un frottement générant un couple maximale égal à 15Nmm, de préférence inférieur à 10Nmm, tout en assurant une étanchéité sous des pressions différentielles allant jusqu'à 4 bar. Ce joint 100 permet de protéger le roulement et les billes 165 du roulement des polluants pouvant contaminer sa graisse interne.The geometry and the material of the lip(s) are chosen to limit friction, with for example friction generating a maximum torque equal to 15Nmm, preferably less than 10Nmm, while ensuring sealing under differential pressures of up to 4 bar. This seal 100 makes it possible to protect the bearing and the balls 165 of the bearing from pollutants which may contaminate its internal grease.

Le joint 100 permet également d'éviter la purge de la graisse interne du roulement sous l'effet d'aspiration par le trou d'évent.The seal 100 also makes it possible to avoid the bleeding of the internal grease of the bearing under the suction effect through the vent hole.

L'invention prévoit un chicanage 200 en amont du segment 29a disposé du coté de la roue 14. Le chicanage est formé par au moins une chicane. On entend par chicane un passage circulaire pour l'air qui est non rectiligne. L'air provient du compartiment roue 14 compresseur. Ce passage d'air est formé de façon à déboucher entre la roue 14 et le segment 29a disposé du coté de la roue 14.The invention provides a baffle 200 upstream of the segment 29a arranged on the side of the wheel 14. The baffle is formed by at least one baffle. By chicane is meant a circular passage for the air which is not rectilinear. The air comes from the wheel compartment 14 compressor. This air passage is formed so as to emerge between the wheel 14 and the segment 29a arranged on the side of the wheel 14.

Selon un mode de réalisation de l'invention, le chicanage 200 est formé directement dans le corps 140 du compresseur. Plus précisément, le chicanage 200 est réalisé grâce à des formes spécifiques aménagées dans le corps 140 du compresseur.According to one embodiment of the invention, the baffle 200 is formed directly in the body 140 of the compressor. More precisely, the baffling 200 is achieved by means of specific shapes arranged in the body 140 of the compressor.

Selon un autre mode de réalisation de l'invention, le chicanage 200 est réalisé grâce à des formes spécifiques aménagées dans le corps 140 et la pièce supplémentaire 131, au niveau de la frontière commune à ces deux pièces afin de créer un chemin non rectiligne pour l'air. Ces formes sont complémentaires. La présence de la pièce supplémentaire 131 permet de simplifier le montage du roulement et d'augmenter la surface d'appui avec la roue 14. L'augmentation de la surface de contact de la roue avec la pièce supplémentaire permet d'éviter le matage ou déformation de la roue 14. Selon un mode de réalisation de l'invention, la roue 14 est réalisée dans un matériau plus tendre que la pièce supplémentaire 131 et l'arbre 13. Par exemple, la roue 14 est en aluminium et la pièce supplémentaire 131 et l'arbre 13 sont en acier.According to another embodiment of the invention, the baffling 200 is achieved by means of specific shapes arranged in the body 140 and the additional part 131, at the level of the border common to these two parts in order to create a non-rectilinear path for the air. These forms are complementary. The presence of the additional part 131 makes it possible to simplify the mounting of the bearing and to increase the contact surface with the wheel 14. The increase in the contact surface of the wheel with the additional part makes it possible to avoid caulking or deformation of the wheel 14. According to one embodiment of the invention, the wheel 14 is made of a softer material than the additional part 131 and the shaft 13. For example, the wheel 14 is made of aluminum and the additional part 131 and shaft 13 are made of steel.

Selon un mode de réalisation de l'invention, le chicanage 200 est composé d'au moins 2 segments orientés selon des directions différentes, au moins une direction radiale et au moins une direction axiale. Ainsi le chicanage 200 est composé de plusieurs segments 201 rectilignes. Cette configuration oblige le flux d'air à changer de direction, passant d'une direction radiale à une direction axiale, ou inversement. Une direction intermédiaire entre radial et axial, c'est-à-dire en biais, est également possible.According to one embodiment of the invention, the baffle 200 is composed of at least 2 segments oriented in different directions, at least one radial direction and at least one axial direction. Thus the baffle 200 is composed of several rectilinear segments 201 . This configuration forces the airflow to change direction, going from a radial direction to an axial direction, or vice versa. An intermediate direction between radial and axial, that is to say obliquely, is also possible.

Selon un mode de réalisation de l'invention, le chicanage 200 comprend au moins 6 segments 201, donc 5 changements de direction. Les changements de direction créent de la perte de charge, c'est-à-dire une perte de pression le long du chemin. Cette perte de pression entraine une réduction du débit.According to one embodiment of the invention, the baffle 200 comprises at least 6 segments 201, therefore 5 changes of direction. Changes in direction create head loss, i.e. a loss of pressure along the path. This loss of pressure leads to a reduction in flow.

Afin d'augmenter la perte de charge, la section et la longueur de chaque segment 201 sont choisis de façon à ce que le rapport section/longueur de chaque segment soit le plus faible possible. En effet, plus ce rapport est faible, plus il y'a de perte de charge, car plus la section est petite et plus le chemin est long et plus il est difficile pour l'air de circuler. La longueur de chaque segment 201 est ainsi maximisée, en tenant compte des contraintes d'encombrement.In order to increase the pressure drop, the section and the length of each segment 201 are chosen so that the section/length ratio of each segment is as low as possible. Indeed, the lower this ratio, the greater the pressure drop, because the smaller the section and the longer the path and the more difficult it is for the air to circulate. The length of each segment 201 is thus maximized, taking into account the space constraints.

Selon un mode de réalisation de l'invention, chaque segment 201 mesure, par exemple, entre 1 mm et 5 mm, et de préférence entre 1 et 3 mm de long dans la direction radiale ou dans la direction axiale ou en biais.According to one embodiment of the invention, each segment 201 measures, for example, between 1 mm and 5 mm, and preferably between 1 and 3 mm long in the radial direction or in the axial direction or obliquely.

Selon un mode de réalisation de l'invention, le jeu entre le corps 140 et la pièce supplémentaire 131 doit être minimisé, en tenant compte des tolérances de fabrication et de positionnement des différents composants. Ce jeu est par exemple inférieur à 0,5mm, de préférence inférieur à 0,25mm dans la direction radiale et inférieur à 0,75mm, de préférence inférieur à 0,5mm dans la direction axiale.
Selon un mode de réalisation, non illustré, la section évolue, c'est-à-dire augmente puis diminue de façon importante afin de créer des turbulences pour limiter le débit.According to one embodiment of the invention, the clearance between the body 140 and the additional part 131 must be minimized, taking into account the manufacturing and positioning tolerances of the various components. This play is for example less than 0.5 mm, preferably less than 0.25 mm in the radial direction and less than 0.75 mm, preferably less than 0.5 mm in the axial direction.
According to one embodiment, not illustrated, the section evolves, that is to say increases and then decreases significantly in order to create turbulence to limit the flow.

L'objectif de ce chicanage 200 est de maximiser la perte de charge entre la roue du compresseur et le segment 29a disposé du coté de la roue 14. Le débit dans cette zone, ainsi que la pression en amont du segment 29a disposé du coté de la roue 14 sont alors réduits. La fuite à travers ce segment est alors réduite. De cette façon, l'accumulation de polluants entre les 2 segments est réduite. Et le besoin d'évacuation par le trou d'évent est alors moindre.The objective of this baffling 200 is to maximize the pressure drop between the wheel of the compressor and the segment 29a placed on the side of the wheel 14. The flow rate in this zone, as well as the pressure upstream of the segment 29a placed on the side of wheel 14 are then reduced. Leakage through this segment is then reduced. In this way, the accumulation of pollutants between the 2 segments is reduced. And the need for evacuation through the vent hole is then less.

Selon un autre mode de réalisation de l'invention, le chicanage 200 est formé directement dans le corps 140 du compresseur.According to another embodiment of the invention, the baffle 200 is formed directly in the body 140 of the compressor.

Selon une troisième variante de réalisation, l'invention prévoit une gorge 300 en amont du chicanage 200. On entend par gorge 300, une rainure de forme en général demi-circulaire, disposée circulairement par rapport à l'axe de l'arbre 13. L'ouverture 301 de la gorge 300 est formée vers l'extérieur, c'est à dire dans la direction opposée à l'arbre.According to a third variant embodiment, the invention provides a groove 300 upstream of the baffle 200. By groove 300 is meant a groove of generally semi-circular shape, arranged circularly with respect to the axis of the shaft 13. The opening 301 of the groove 300 is formed outwards, that is to say in the direction opposite to the shaft.

Selon un mode de réalisation de l'invention, la gorge est formée dans la pièce supplémentaire 131. La gorge est définie par un évidement de forme torique, autour de l'arbre, disposé à une distance de l'arbre définie par la longueur de la chicane.According to one embodiment of the invention, the groove is formed in the additional part 131. The groove is defined by a torus-shaped recess, around the shaft, disposed at a distance from the shaft defined by the length of chicanery.

Selon un mode de réalisation de l'invention, le diamètre moyen Di de la forme torique, et donc de la gorge est compris entre 10 mm et 20 mm. Le diamètre propre Dp de la forme torique, c'est à dire le diamètre Dp de la gorge défini parallèlement à l'axe X de l'arbre est compris 1 et 2 mm. Cette gorge 300 permet de recueillir les gouttelettes de polluant tels que notamment l'huile et de les centrifuger, afin d'éviter qu'elles n'atteignent le segment 29a disposé du coté de la roue 14. L'air au niveau du segment 29a disposé du coté de la roue 14 est ainsi débarrassé d'une partie des polluants.According to one embodiment of the invention, the mean diameter Di of the toroidal shape, and therefore of the groove, is between 10 mm and 20 mm. The proper diameter Dp of the toric shape, ie the diameter Dp of the groove defined parallel to the axis X of the shaft is between 1 and 2 mm. This groove 300 makes it possible to collect the droplets of pollutant such as in particular oil and to centrifuge them, in order to prevent them from reaching the segment 29a arranged on the side of the wheel 14. The air at the level of the segment 29a disposed on the side of the wheel 14 is thus freed from some of the pollutants.

Selon une autre variante de réalisation, l'invention prévoit l'association des trois variantes décrites précédemment. Plus précisément, le compresseur selon l'invention comporte au moins un joint 100 de protection d'au moins un roulement, une chicane 200 entre la roue 14 et le segment 29a disposé du coté de la roue 14, et une gorge 300 en amont de la chicane.According to another variant embodiment, the invention provides for the association of the three variants described previously. More specifically, the compressor according to the invention comprises at least one seal 100 for protecting at least one bearing, a baffle 200 between the wheel 14 and the segment 29a arranged on the side of the wheel 14, and a groove 300 upstream of chicanery.

Le compresseur selon l'invention, est ainsi configuré de façon à protéger les roulements, et également le moteur électrique, contre des polluants tels que de l'huile, des gaz de recirculation ou tous autres polluants. L'étanchéité améliorée de ce système permet de réduire le besoin en dépression du trou d'évent et même d'autoriser une légère surpression. A titre d'exemple, l'étanchéité est maintenue sous une surpression du trou d'évent de 50mbar par rapport à la pression atmosphériqueThe compressor according to the invention is thus configured so as to protect the bearings, and also the electric motor, against pollutants such as oil, recirculating gases or any other pollutants. The improved sealing of this system makes it possible to reduce the need for vacuum in the vent hole and even to allow a slight overpressure. For example, the seal is maintained under an overpressure of the vent hole of 50mbar compared to atmospheric pressure

Claims (8)

  1. Electric compressor (9) having a shaft (13) driven in rotation by an electric motor by way of rolling bearings (16), the shaft driving a compressor wheel (14) in rotation, the compressor having two sealing segments (29a, 29b) which are mounted around the shaft (13) between the rolling bearings (16) and the compressor wheel (14) and having a vent hole (31) circuit, for circulating a flow of contaminants towards the exterior of the compressor (9), the inlet (37) of said vent hole is disposed between the two sealing segments, and the compressor having baffling (200) upstream of the segment (29a) disposed on the side of the wheel (14), characterized in that it has at least one seal (100) for protecting the rolling bearings (16), and a groove (300) upstream of the baffling (200).
  2. Compressor (9) according to Claim 1, wherein the seal (100) is disposed on a face of the rolling bearings that is perpendicular to a longitudinal axis X of the shaft (13) of the compressor, on the face oriented towards the segments (29a, b).
  3. Compressor (9) according to one of Claims 1 or 2, wherein the seal (100) is a rubbing seal.
  4. Compressor (9) according to one of Claims 1 to 3, wherein the seal (100) is made of elastomer.
  5. Compressor (9) according to one of Claims 1 to 4, wherein the baffling (200) is implemented at the level of the contact between an additional part (131) fixed in a circular manner to the shaft (13) and the body (140) of the compressor.
  6. Compressor (9) according to one of Claims 1 to 5, wherein the opening (301) of the groove (300) is formed towards the exterior, that is to say in the direction opposite to the shaft.
  7. Compressor (9) according to one of Claims 1 to 6, wherein the groove is formed in the additional part (131) .
  8. Compressor (9) according to one of Claims 1 to 7, wherein the compressor is an electric supercharger of an internal combustion engine.
EP16725189.1A 2015-04-30 2016-05-02 Electric compressor with improved dynamic sealing system Active EP3289222B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR1553934A FR3035685B1 (en) 2015-04-30 2015-04-30 ELECTRICAL COMPRESSOR WITH IMPROVED DYNAMIC SEALING SYSTEM
FR1559872A FR3035687B1 (en) 2015-04-30 2015-10-16 ELECTRICAL COMPRESSOR WITH IMPROVED DYNAMIC SEALING SYSTEM
PCT/FR2016/051029 WO2016174375A1 (en) 2015-04-30 2016-05-02 Electric compressor with improved dynamic sealing system

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EP3289222A1 EP3289222A1 (en) 2018-03-07
EP3289222B1 true EP3289222B1 (en) 2022-07-27

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EP16725189.1A Active EP3289222B1 (en) 2015-04-30 2016-05-02 Electric compressor with improved dynamic sealing system

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EP (1) EP3289222B1 (en)
FR (2) FR3035685B1 (en)
PL (1) PL3289222T3 (en)
WO (1) WO2016174375A1 (en)

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Publication number Priority date Publication date Assignee Title
FR3068086B1 (en) * 2017-06-25 2019-07-19 Valeo Systemes De Controle Moteur ELECTRICAL COMPRESSOR WITH EVENT HOLE
FR3071976A1 (en) * 2017-09-29 2019-04-05 Valeo Systemes De Controle Moteur ELECTRIC COMPRESSOR

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2966375A (en) * 1958-09-22 1960-12-27 Commissariat Energie Atomique Sealing device for the bearings of compressors or similar machines
US3909154A (en) * 1974-09-05 1975-09-30 Carrier Corp Centrifugal compressor
US5076765A (en) * 1988-08-03 1991-12-31 Nissan Motor Company, Altd. Shaft seal arrangement of turbocharger
EP1207310B1 (en) * 1999-07-23 2011-04-20 Hitachi Plant Technologies, Ltd. Dry gas seal for turbo fluid machinery
GB2516060B (en) 2013-07-09 2019-07-03 Valeo Air Man Uk Limited An electric supercharger having a protected bearing assembly

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Publication number Publication date
FR3035687B1 (en) 2019-03-22
WO2016174375A1 (en) 2016-11-03
FR3035685B1 (en) 2019-04-05
EP3289222A1 (en) 2018-03-07
PL3289222T3 (en) 2022-11-21
FR3035685A1 (en) 2016-11-04
FR3035687A1 (en) 2016-11-04

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