EP3292327A1 - Improved sealing system for a rotating shaft - Google Patents

Improved sealing system for a rotating shaft

Info

Publication number
EP3292327A1
EP3292327A1 EP16724443.3A EP16724443A EP3292327A1 EP 3292327 A1 EP3292327 A1 EP 3292327A1 EP 16724443 A EP16724443 A EP 16724443A EP 3292327 A1 EP3292327 A1 EP 3292327A1
Authority
EP
European Patent Office
Prior art keywords
shaft
seal
recess
compartment
compressor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP16724443.3A
Other languages
German (de)
French (fr)
Inventor
Nicolas Martin
Stephen Knight
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
Original Assignee
Valeo Systemes de Controle Moteur SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valeo Systemes de Controle Moteur SAS filed Critical Valeo Systemes de Controle Moteur SAS
Publication of EP3292327A1 publication Critical patent/EP3292327A1/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/44—Free-space packings
    • F16J15/441—Free-space packings with floating ring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
    • F01D11/003—Preventing or minimising internal leakage of working-fluid, e.g. between stages by packing rings; Mechanical seals
    • 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
    • F04D29/12—Shaft sealings using sealing-rings
    • F04D29/122—Shaft sealings using sealing-rings especially adapted for elastic fluid pumps

Definitions

  • the present invention relates to the field of sealing systems, and more particularly to a sealing system for rotating shaft.
  • An electric compressor is a device used to supercharge a heat engine and operating with an electric motor.
  • An electric compressor has a shaft, which can rotate up to 300,000 rpm, which extends into at least two compartments.
  • the first compartment may contain rotational guiding means and / or drive means of the shaft.
  • the first compartment can contain an electric motor and rotating guide elements such as ball bearings.
  • the second compartment may contain the compressor wheel connected to the end of the shaft.
  • a sealing system is disposed at the portion of the shaft between the two compartments.
  • This system is composed of a seal disposed in a recess formed directly in the shaft.
  • the outer diameter size of these seals is of the order of 14mm or 16mm.
  • the geometry of the recess can have a negative impact on the seal.
  • the wall of the recess, against which is disposed the seal may not be perfectly smooth, or be veiled.
  • the seal is thus not always in optimal contact with the wall of the recess.
  • a seal geometry defect can also have the same effect. The larger the segment size, the greater the effect.
  • the present invention therefore aims to overcome one or more of the disadvantages of the devices of the prior art by providing an improved sealing system for rotating shaft to prevent pollution of the first compartment, including the electric motor.
  • the present invention proposes a sealing system, for a rotary shaft of a mechanical or electrical compressor, the shaft being connected to at least one compartment, the shaft comprising at least one seal disposed in a recess for maintaining the sealing the compartment, the outer diameter of the seal being less than or equal to 10mm.
  • the reduction of the outer diameter has the advantage of reducing the contact surfaces that are joined with respect to the fixed and joined part with respect to the shaft, which improves the sealing of the system.
  • the outer diameter of the seal is configured so that the seal is adapted to cooperate with the inner face of a bore formed in a compressor body.
  • the seal is an open ring-shaped elastic segment.
  • the seal surrounds the shaft and is pressed against a side wall of the recess.
  • the recess is formed directly in the shaft.
  • the recess is formed by an additional piece attached to the shaft.
  • the additional piece in the form of a ring in which is hollowed the recess.
  • the additional piece is formed in one part or in two parts.
  • the system comprises two seals.
  • the invention also relates to a mechanical or electrical compressor equipped with a sealing system according to the invention.
  • FIG. 1 is a schematic representation of a longitudinal sectional view of an embodiment of a device according to the invention
  • FIG. 2 is a schematic representation of a longitudinal sectional view of another embodiment of a part of a device according to the invention.
  • FIG. 3 is a schematic representation of a seal according to the invention.
  • the present invention relates to a sealing system for a rotating shaft.
  • the sealing system is formed by at least one seal disposed in a recess.
  • seal is meant a sealing segment.
  • the rotating shaft is a shaft for a mechanical or electrical compressor.
  • the term electric compressor an air compressor, volumetric or not and for example centrifugal or radial, driven by an electric motor, for the purpose of supercharging a heat engine.
  • the electric motor is a DC or AC asynchronous motor.
  • the electric motor is a variable reluctance motor (also called SRM machine for Switched Reluctance Motor according to English terminology).
  • compressor means indifferently mechanical compressor or electric compressor, unless additional precision.
  • the shaft 10 is a conventional longitudinal shaft, cylindrical.
  • the shaft 10 rotates generally at a speed between 0 and 300000 rpm and preferably between 50000 and 80000 rpm. As illustrated in Figure 1, the shaft 10 extends in and between at least two compartments 1, 2. More specifically, an end 12 of the shaft opens into a first compartment 1 of the compressor. According to one embodiment of the invention, the first compartment 1 contains rotation guiding means and / or drive means 4 of the shaft. For example, for an electric compressor, the first compartment 1 comprises an electric motor. The other end 11 of the shaft opens into a second compartment 2 of the compressor. According to one embodiment of the invention the second compartment 2 comprises the wheel 3 of the compressor. The shaft 10 is thus rotated by the drive means 4 arranged in the first compartment 1, and itself drives in rotation the wheel 3 of the compressor arranged in the second compartment 2.
  • the shaft 10 is disposed in a bore 13 of a fixed part 14 of the compressor, forming the compressor body.
  • fixed part is meant a part which is not driven in rotation or in translation.
  • the system comprises, at the level of the shaft 10, at least one recess 15, 15 ', 16,
  • At least one recess 15, 15 ' is formed, that is to say machined, directly in the shaft 10.
  • At least one recess 16, 16 ' is formed in an additional part 17 fixed to the shaft 10.
  • the additional piece has the shape of a ring in which is hollowed out the recess 16. It is disposed on a flat wall of the shaft 10 or in another recess 161 cut in the shaft 10. This other recess 161 is configured to allow easy insertion of the additional part 17 on the tree 10.
  • the additional part 17 is formed in a single part or in two parts not shown.
  • the extra part in two parts can facilitate the assembly of the system.
  • the recess is closed by the fixed part
  • At least one sealing gasket 5, 5 ', 6, 6', illustrated in FIG. 3, is disposed in a recess 15, 15 ', 16, 16'.
  • the seal 5, 5 ', 6, 6' surrounds the shaft and is pressed against at least one side wall 131 of the recess 15, 15 ', 16, 16'.
  • the side wall 131 of the recess is the wall perpendicular to the longitudinal axis X of the shaft 10.
  • the shaft comprises at least one seal 5 disposed on the side of the first compartment 1 of the compressor.
  • the seal maintains the seal at the junction between the shaft and the first compartment.
  • the shaft comprises a seal disposed on the side of the second compartment 2 of the compressor.
  • the seal maintains the seal at the junction between the shaft and the first compartment.
  • two seals 5, 5 ', 6, 6' are arranged in two recesses 15, 15 ', 16, 16'.
  • a first seal 5 is disposed on the side of the first compartment 1 of the compressor, a second seal 5 'is disposed on the side of the second compartment 2 of the compressor.
  • the body of the compressor comprises a vent hole 141 arranged to open into a space between the two seals 5, 5 ', 6, 6'.
  • This vent hole allows the evacuation of pollutants arriving from the second compartment 2. Indeed, it is possible that pollutants cross the seal disposed on the side of the second compartment 2. The presence of the vent hole 141 thus prevents the accumulation of these pollutants between the two seals 5, 5 ', 6, 6'.
  • the gasket 5, 5 ', 6, 6', illustrated in FIG. 3 is an open elastic segment 51 in the form of a ring.
  • the gasket 5, 5 ', 6, 6' is of rectangular section.
  • the gasket 5, 5 ', 6, 6' is arranged pressed against the side wall 131 of the recess and against the internal wall 142 of the bore 13 of the part fixed 14 of the compressor. It is these two contact zones of the gasket 5, 5 ', 6, 6' which make it possible to create the desired seal.
  • the external diameter of the gasket 5, 5 ', 6, 6' is configured so that the gasket 5, 5 ', 6, 6 'cooperates with the inner face 142 of the bore 13 formed in the body 14 of the compressor.
  • it is the internal diameter of the bore of the fixed part 14 which is configured to cooperate with the seal 5, 5 ', 6, 6'.
  • the outer diameter d1 of the gasket is complementary to the inner diameter d2 of the fixed part 14 in which it is arranged.
  • This diameter is less than or equal to 10 mm, preferably less than 10 mm, preferably this diameter is between 9 mm and 6 mm, very preferably this diameter is equal to 9 mm.
  • the seal is made of steel, stainless steel or cast iron.
  • such a seal can be used with an electric compressor whose maximum speed of rotation of the shaft and between 60000 and 80 000 rpm. Such a speed allows the use of a smaller diameter shaft without risking to reach the critical speed of the tree. It is thus possible to use seals with a diameter of less than or equal to 10 mm.
  • the reduction of the outer diameter has the advantage of reducing the contact surfaces that are joined with respect to the fixed and joined part with respect to the shaft, which improves the sealing of the system.
  • the seal is also improved thanks to a reduction of the clearance 52 to the cut.
  • the minimum clearance to the cut is used to compensate for thermal expansion. A smaller diameter thus generates less elongation by thermal expansion. The value of the minimum clearance can thus be reduced.
  • the tolerances are generally proportional to the dimensions. A smaller dimension therefore induces a smaller gap between the minimum cut game and the maximum cut game. The play in the cup is better controlled, which also implies a better seal.
  • the reduction of the joint / shaft contact surface and its location on a smaller diameter reduce the friction torque generated during the rotation of the shaft, as well as associated heating.

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

Abstract

The present invention relates to a sealing system for a rotating shaft (10) of a mechanical or electric compressor, the shaft (10) being connected to at least one compartment (1, 2), and comprising at least one seal (5, 5', 6, 6') disposed in a recess (15, 15', 16, 16') to maintain the sealing tightness of the compartment, wherein the outer diameter of the seal is no greater than 10 mm. The invention also relates to a compressor comprising such a system.

Description

SYSTEME D'ETANCHEITE AMELIORE POUR ARBRE TOURNANT  IMPROVED SEALING SYSTEM FOR ROTATING SHAFT
La présente invention concerne le domaine des systèmes d'étanchéité, et plus particulièrement un système d'étanchéité pour arbre tournant. The present invention relates to the field of sealing systems, and more particularly to a sealing system for rotating shaft.
La présente invention s'applique par exemple aux arbres tournants des compresseurs mécaniques et électriques. Un compresseur électrique est un dispositif utilisé pour suralimenter un moteur thermique et fonctionnant avec un moteur électrique.  The present invention applies for example to rotating shafts of mechanical and electrical compressors. An electric compressor is a device used to supercharge a heat engine and operating with an electric motor.
Un compresseur électrique comporte un arbre, pouvant tourner jusqu'à 300000 tours par minutes, qui s'étend dans au moins deux compartiments. Le premier compartiment peut contenir des moyens de guidage en rotation et/ou des moyens d'entraînement de l'arbre. Dans un compresseur électrique, le premier compartiment peut contenir un moteur électrique et des éléments de guidage en rotation tels que des roulements à billes. Le deuxième compartiment peut contenir la roue du compresseur connectée à l'extrémité de l'arbre.  An electric compressor has a shaft, which can rotate up to 300,000 rpm, which extends into at least two compartments. The first compartment may contain rotational guiding means and / or drive means of the shaft. In an electric compressor, the first compartment can contain an electric motor and rotating guide elements such as ball bearings. The second compartment may contain the compressor wheel connected to the end of the shaft.
Dans un tel dispositif il est nécessaire qu'une étanchéité maximale soit maintenue au niveau de l'arbre entre le premier et le deuxième compartiment. En effet, des polluants du moteur, tels que l'huile, provenant du deuxième compartiment, peuvent pénétrer dans le premier compartiment au niveau de la portion de l'arbre entre les deux compartiments.  In such a device it is necessary that a maximum seal is maintained at the level of the shaft between the first and the second compartment. Indeed, engine pollutants, such as oil, from the second compartment, can enter the first compartment at the portion of the shaft between the two compartments.
Actuellement, pour éviter que des polluants ne pénètrent dans le premier compartiment, un système d'étanchéité est disposé au niveau de la portion de l'arbre entre les deux compartiments. Ce système est composé d'un joint disposé dans un évidement formé directement dans l'arbre. La taille de diamètre externe de ces joints est de l'ordre de 14mm ou 16mm.  Currently, to prevent pollutants from entering the first compartment, a sealing system is disposed at the portion of the shaft between the two compartments. This system is composed of a seal disposed in a recess formed directly in the shaft. The outer diameter size of these seals is of the order of 14mm or 16mm.
Avec ce type de joints d'étanchéité la géométrie de l'évidement peut avoir un impact négatif sur l'étanchéité. En effet, la paroi de l'évidement, contre laquelle est disposé le joint, peut ne pas être parfaitement lisse, ou être voilée. Lorsque l'arbre tourne, le joint n'est ainsi pas toujours en contact optimal avec la paroi de l'évidement. Un défaut de géométrie du joint peut également avoir le même effet. Plus la taille du segment est grande et plus cet effet est important. With this type of seals the geometry of the recess can have a negative impact on the seal. Indeed, the wall of the recess, against which is disposed the seal, may not be perfectly smooth, or be veiled. When the shaft rotates, the seal is thus not always in optimal contact with the wall of the recess. A seal geometry defect can also have the same effect. The larger the segment size, the greater the effect.
La présente invention a donc pour objet de pallier un ou plusieurs des inconvénients des dispositifs de l'art antérieur en proposant un système d'étanchéité amélioré pour arbre tournant permettant d'éviter la pollution du premier compartiment, et notamment du moteur électrique.  The present invention therefore aims to overcome one or more of the disadvantages of the devices of the prior art by providing an improved sealing system for rotating shaft to prevent pollution of the first compartment, including the electric motor.
Pour cela la présente invention propose un système d'étanchéité, pour arbre tournant de compresseur mécanique ou électrique, l'arbre étant relié à au moins un compartiment, l'arbre comportant au moins un joint d'étanchéité disposé dans un évidement pour maintenir l'étanchéité du compartiment, le diamètre extérieur du joint étant inférieur ou égale à 10mm.  For this purpose, the present invention proposes a sealing system, for a rotary shaft of a mechanical or electrical compressor, the shaft being connected to at least one compartment, the shaft comprising at least one seal disposed in a recess for maintaining the sealing the compartment, the outer diameter of the seal being less than or equal to 10mm.
La réduction du diamètre extérieur a pour avantage de réduire les surfaces de contact joint par rapport à la pièce fixe et joint par rapport à l'arbre, ce qui améliore l'étanchéité du système.  The reduction of the outer diameter has the advantage of reducing the contact surfaces that are joined with respect to the fixed and joined part with respect to the shaft, which improves the sealing of the system.
Selon un mode de réalisation de l'invention, le diamètre externe du joint est configuré de façon à ce que le joint soit apte à coopérer avec la face interne d'un alésage ménagé dans un corps de compresseur.  According to one embodiment of the invention, the outer diameter of the seal is configured so that the seal is adapted to cooperate with the inner face of a bore formed in a compressor body.
Selon un mode de réalisation de l'invention, le joint est un segment élastique ouvert en forme d'anneau.  According to one embodiment of the invention, the seal is an open ring-shaped elastic segment.
Selon un mode de réalisation de l'invention, le joint entoure l'arbre et est plaqué contre une paroi latérale de l'évidement.  According to one embodiment of the invention, the seal surrounds the shaft and is pressed against a side wall of the recess.
Selon un mode de réalisation de l'invention, l'évidement est formé, directement dans l'arbre.  According to one embodiment of the invention, the recess is formed directly in the shaft.
Selon un mode de réalisation de l'invention, l'évidement est formé par une pièce supplémentaire fixée à l'arbre.  According to one embodiment of the invention, the recess is formed by an additional piece attached to the shaft.
Selon un mode de réalisation de l'invention, la pièce supplémentaire à la forme d'une bague dans laquelle est creusé l'évidement.  According to one embodiment of the invention, the additional piece in the form of a ring in which is hollowed the recess.
Selon un mode de réalisation de l'invention, la pièce supplémentaire est formé en une seule partie ou en deux parties.  According to one embodiment of the invention, the additional piece is formed in one part or in two parts.
Selon un mode de réalisation de l'invention, le système comporte deux joints. L'invention concerne également un compresseur mécanique ou électrique équipé d'un système d'étanchéité selon l'invention. According to one embodiment of the invention, the system comprises two seals. The invention also relates to a mechanical or electrical compressor equipped with a sealing system according to the invention.
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:  Other objects, features and advantages of the invention will be better understood and will appear more clearly on reading the description given hereinafter with reference to the appended figures given by way of example and in which:
- la figure 1 est une représentation schématique d'une vue en coupe longitudinale d'un mode de réalisation d'un dispositif selon l'invention,  FIG. 1 is a schematic representation of a longitudinal sectional view of an embodiment of a device according to the invention,
- la figure 2 est une représentation schématique d'une vue en coupe longitudinale d'un autre mode de réalisation d'une partie d'un dispositif selon l'invention,  FIG. 2 is a schematic representation of a longitudinal sectional view of another embodiment of a part of a device according to the invention,
- la figure 3 est une représentation schématique d'un joint selon l'invention.  - Figure 3 is a schematic representation of a seal according to the invention.
La présente invention concerne un système d'étanchéité pour un arbre tournant. Dans le cadre de l'invention, le système d'étanchéité est formé par au moins un joint disposé dans un évidement. On entend par joint un segment d'étanchéité. The present invention relates to a sealing system for a rotating shaft. In the context of the invention, the sealing system is formed by at least one seal disposed in a recess. By seal is meant a sealing segment.
Selon un mode de réalisation de l'invention l'arbre tournant est un arbre pour compresseur mécanique ou électrique.  According to one embodiment of the invention, the rotating shaft is a shaft for a mechanical or electrical compressor.
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, an air compressor, volumetric or not and for example centrifugal or radial, driven by an electric motor, for the purpose of supercharging a heat engine. According to one embodiment of the invention, the electric motor is a DC or AC asynchronous motor.
Plus précisément, 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).  More specifically, 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 English terminology).
Dans la suite de la description, le terme compresseur signifie indifféremment compresseur mécanique ou compresseur électrique, sauf précision complémentaire.  In the following description, the term compressor means indifferently mechanical compressor or electric compressor, unless additional precision.
Comme cela est illustré sur les figures 1 et 2, l'arbre 10 est un arbre classique, longitudinal, de forme cylindrique.  As illustrated in Figures 1 and 2, the shaft 10 is a conventional longitudinal shaft, cylindrical.
L'arbre 10 tourne en général à une vitesse comprise entre 0 et 300000 tr/min et de préférence entre 50000 et 80000 tr/min. Comme illustré sur la figure 1, l'arbre 10 s'étend dans et entre au moins deux compartiments 1, 2. Plus précisément, une extrémité 12 de l'arbre débouche à l'intérieur d'un premier compartiment 1 du compresseur. Selon un mode de réalisation de l'invention, le premier compartiment 1 contient des moyens de guidage en rotation et/ou des moyens d'entraînement 4 de l'arbre. Par exemple, pour un compresseur électrique, le premier compartiment 1 comporte un moteur électrique. L'autre extrémité 11 de l'arbre débouche à l'intérieur d'un deuxième compartiment 2 du compresseur. Selon un mode de réalisation de l'invention le deuxième compartiment 2 comporte la roue 3 du compresseur. L'arbre 10 est ainsi entraîné en rotation par les moyens d'entraînement 4 disposés dans le premier compartiment 1, et entraine lui-même en rotation la roue 3 du compresseur disposée dans le deuxième compartiment 2. The shaft 10 rotates generally at a speed between 0 and 300000 rpm and preferably between 50000 and 80000 rpm. As illustrated in Figure 1, the shaft 10 extends in and between at least two compartments 1, 2. More specifically, an end 12 of the shaft opens into a first compartment 1 of the compressor. According to one embodiment of the invention, the first compartment 1 contains rotation guiding means and / or drive means 4 of the shaft. For example, for an electric compressor, the first compartment 1 comprises an electric motor. The other end 11 of the shaft opens into a second compartment 2 of the compressor. According to one embodiment of the invention the second compartment 2 comprises the wheel 3 of the compressor. The shaft 10 is thus rotated by the drive means 4 arranged in the first compartment 1, and itself drives in rotation the wheel 3 of the compressor arranged in the second compartment 2.
L'arbre 10 est disposé dans un alésage 13 d'une pièce fixe 14 du compresseur, formant le corps du compresseur. On entend par pièce fixe, une pièce qui n'est pas entraînée en rotation ou en translation.  The shaft 10 is disposed in a bore 13 of a fixed part 14 of the compressor, forming the compressor body. By fixed part is meant a part which is not driven in rotation or in translation.
Le système comporte, au niveau de l'arbre 10, au moins un évidement 15, 15', 16, The system comprises, at the level of the shaft 10, at least one recess 15, 15 ', 16,
16' illustré figures 1 et 2. On entend par évidement 15, 15', 16, 16' une partie de diamètre 150 réduit par rapport au diamètre 151 du reste de la pièce portant l'évidement. L'évidement 15, 15', 16, 16' est formé tout autour de l'arbre 10. 16 'illustrated in Figures 1 and 2. By recess 15, 15', 16, 16 'means a portion of diameter 150 reduced with respect to the diameter 151 of the rest of the part carrying the recess. The recess 15, 15 ', 16, 16' is formed all around the shaft 10.
Selon un mode de réalisation du système selon l'invention illustré sur la figure 2, au moins un évidement 15, 15' est formé, c'est-à-dire usiné, directement dans l'arbre 10.  According to one embodiment of the system according to the invention illustrated in FIG. 2, at least one recess 15, 15 'is formed, that is to say machined, directly in the shaft 10.
Selon un autre mode de réalisation du système de l'invention illustré figure 1, au moins un évidement 16, 16' est formé dans une pièce supplémentaire 17 fixée à l'arbre 10. La pièce supplémentaire a la forme d'une bague dans laquelle est creusé l'évidement 16. Elle est disposée sur une paroi plane de l'arbre 10 ou dans un autre évidement 161 creusé dans l'arbre 10. Cet autre évidement 161 est configuré de façon à permettre une insertion facile de la pièce supplémentaire 17 sur l'arbre 10.  According to another embodiment of the system of the invention illustrated in FIG. 1, at least one recess 16, 16 'is formed in an additional part 17 fixed to the shaft 10. The additional piece has the shape of a ring in which is hollowed out the recess 16. It is disposed on a flat wall of the shaft 10 or in another recess 161 cut in the shaft 10. This other recess 161 is configured to allow easy insertion of the additional part 17 on the tree 10.
Selon un mode de réalisation du système selon l'invention, la pièce supplémentaire 17 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 17 is formed in a single part or in two parts not shown.
La pièce supplémentaire en deux parties peut permettre de faciliter le montage du système. Selon un mode de réalisation de l'invention, l'évidement est fermé par la pièce fixeThe extra part in two parts can facilitate the assembly of the system. According to one embodiment of the invention, the recess is closed by the fixed part
14. 14.
Selon une première variante de l'invention, au moins un joint 5, 5', 6, 6' d'étanchéité, illustré figure 3, est disposé dans un évidement 15, 15', 16, 16'. Le joint 5, 5', 6, 6' entoure l'arbre et est plaqué contre au moins une paroi 131 latérale de l'évidement 15, 15', 16, 16'. La paroi latérale 131 de l'évidement est la paroi perpendiculaire à l'axe X longitudinale de l'arbre 10.  According to a first variant of the invention, at least one sealing gasket 5, 5 ', 6, 6', illustrated in FIG. 3, is disposed in a recess 15, 15 ', 16, 16'. The seal 5, 5 ', 6, 6' surrounds the shaft and is pressed against at least one side wall 131 of the recess 15, 15 ', 16, 16'. The side wall 131 of the recess is the wall perpendicular to the longitudinal axis X of the shaft 10.
Selon un mode de réalisation du système selon l'invention, l'arbre comporte au moins un joint 5 disposé du coté du premier compartiment 1 du compresseur. Dans ce mode de réalisation, le joint permet de maintenir l'étanchéité au niveau de la jonction entre l'arbre et le premier compartiment.  According to one embodiment of the system according to the invention, the shaft comprises at least one seal 5 disposed on the side of the first compartment 1 of the compressor. In this embodiment, the seal maintains the seal at the junction between the shaft and the first compartment.
Selon un mode de réalisation du système selon l'invention, l'arbre comporte un joint disposé du coté du deuxième compartiment 2 du compresseur. Dans ce mode de réalisation, le joint permet de maintenir l'étanchéité au niveau de la jonction entre l'arbre et le premier compartiment.  According to one embodiment of the system according to the invention, the shaft comprises a seal disposed on the side of the second compartment 2 of the compressor. In this embodiment, the seal maintains the seal at the junction between the shaft and the first compartment.
Selon une deuxième variante de l'invention, deux joints 5, 5', 6, 6' sont disposés dans deux évidements 15, 15', 16, 16'. Un premier joint 5 est disposé du coté du premier compartiment 1 du compresseur, un deuxième joint 5' est disposé du coté du deuxième compartiment 2 du compresseur.  According to a second variant of the invention, two seals 5, 5 ', 6, 6' are arranged in two recesses 15, 15 ', 16, 16'. A first seal 5 is disposed on the side of the first compartment 1 of the compressor, a second seal 5 'is disposed on the side of the second compartment 2 of the compressor.
Selon un mode de réalisation de cette deuxième variante, le corps du compresseur comporte un trou d'évent 141 disposé de manière à déboucher dans un espace situé entre les deux joints 5, 5', 6, 6'. Ce trou d'évent permet l'évacuation des polluants arrivant du deuxième compartiment 2. En effet, il est possible que des polluants franchissent le joint disposé du coté du deuxième compartiment 2. La présence du trou d'évent 141 évite ainsi l'accumulation de ces polluants entre les deux joints 5, 5', 6, 6'.  According to an embodiment of this second variant, the body of the compressor comprises a vent hole 141 arranged to open into a space between the two seals 5, 5 ', 6, 6'. This vent hole allows the evacuation of pollutants arriving from the second compartment 2. Indeed, it is possible that pollutants cross the seal disposed on the side of the second compartment 2. The presence of the vent hole 141 thus prevents the accumulation of these pollutants between the two seals 5, 5 ', 6, 6'.
Dans le cadre de l'invention, le joint 5, 5', 6, 6' , illustré figure 3, est un segment élastique ouvert 51 en forme d'anneau.  In the context of the invention, the gasket 5, 5 ', 6, 6', illustrated in FIG. 3, is an open elastic segment 51 in the form of a ring.
Selon un mode de réalisation de l'invention, le joint 5, 5', 6, 6' est de section rectangulaire. Dans le cadre de l'invention, le joint 5, 5', 6, 6' est disposé plaqué contre la paroi latérale 131 de l'évidement et contre la paroi interne 142 de l'alésage 13 de la pièce fixe 14 du compresseur. Ce sont ces deux zones de contact du joint 5, 5', 6, 6' qui permettent de créer l'étanchéité voulue. According to one embodiment of the invention, the gasket 5, 5 ', 6, 6' is of rectangular section. In the context of the invention, the gasket 5, 5 ', 6, 6' is arranged pressed against the side wall 131 of the recess and against the internal wall 142 of the bore 13 of the part fixed 14 of the compressor. It is these two contact zones of the gasket 5, 5 ', 6, 6' which make it possible to create the desired seal.
Afin d'obtenir une étanchéité maximale vis-à-vis des polluants provenant du deuxième compartiment 2 du compresseur, le diamètre externe du joint 5, 5', 6, 6' est configuré de façon à ce que le joint 5, 5', 6, 6' coopère avec la face interne 142 de l'alésage 13 ménagé dans le corps 14 du compresseur.  In order to obtain a maximum seal against the pollutants coming from the second compartment 2 of the compressor, the external diameter of the gasket 5, 5 ', 6, 6' is configured so that the gasket 5, 5 ', 6, 6 'cooperates with the inner face 142 of the bore 13 formed in the body 14 of the compressor.
Selon un mode de réalisation de l'invention, c'est le diamètre interne de l'alésage de la pièce fixe 14 qui est configuré pour coopérer avec le joint 5, 5', 6, 6'.  According to one embodiment of the invention, it is the internal diameter of the bore of the fixed part 14 which is configured to cooperate with the seal 5, 5 ', 6, 6'.
Le diamètre extérieur dl du joint est complémentaire au diamètre d2 intérieur de la pièce fixe 14 dans lequel il est disposé. Ce diamètre est inférieur ou égale à 10mm, de préférence inférieur à 10mm, de manière préférée ce diamètre est compris entre 9mm et 6mm, de manière très préférée ce diamètre est égal à 9 mm.  The outer diameter d1 of the gasket is complementary to the inner diameter d2 of the fixed part 14 in which it is arranged. This diameter is less than or equal to 10 mm, preferably less than 10 mm, preferably this diameter is between 9 mm and 6 mm, very preferably this diameter is equal to 9 mm.
Selon un mode de réalisation de l'invention, le joint est en acier, inox ou en fonte. According to one embodiment of the invention, the seal is made of steel, stainless steel or cast iron.
Selon un mode de réalisation de l'invention, un tel joint est utilisable avec un compresseur électrique dont la vitesse maximale de rotation de l'arbre et comprise entre 60000 et 80 000 tr/min. Une telle vitesse autorise l'emploi d'un arbre de plus petit diamètre sans risquer d'atteindre la vitesse critique de l'arbre. Il est ainsi possible d'utiliser des joints de diamètre inférieur ou égale à 10mm. According to one embodiment of the invention, such a seal can be used with an electric compressor whose maximum speed of rotation of the shaft and between 60000 and 80 000 rpm. Such a speed allows the use of a smaller diameter shaft without risking to reach the critical speed of the tree. It is thus possible to use seals with a diameter of less than or equal to 10 mm.
La réduction du diamètre extérieur a pour avantage de réduire les surfaces de contact joint par rapport à la pièce fixe et joint par rapport à l'arbre, ce qui améliore l'étanchéité du système.  The reduction of the outer diameter has the advantage of reducing the contact surfaces that are joined with respect to the fixed and joined part with respect to the shaft, which improves the sealing of the system.
L'étanchéité est également améliorée grâce à une réduction du jeu 52 à la coupe. En effet, le jeu minimal à la coupe sert à compenser les dilatations thermiques. Un diamètre plus petit engendre ainsi moins d'allongement par dilatation thermique. La valeur du jeu minimal peut ainsi être réduite.  The seal is also improved thanks to a reduction of the clearance 52 to the cut. Indeed, the minimum clearance to the cut is used to compensate for thermal expansion. A smaller diameter thus generates less elongation by thermal expansion. The value of the minimum clearance can thus be reduced.
De même, les tolérances sont généralement proportionnelles aux dimensions. Une plus petite dimension induit donc un écart moindre entre le jeu à la coupe minimal et le jeu à la coupe maximal. Le jeu à la coupe est donc mieux maîtrisé, ce qui implique également une meilleure étanchéité. En outre, la réduction de la surface de contact joint / arbre et sa localisation sur un plus petit diamètre réduisent le couple de friction engendré lors de la rotation de l'arbre, ainsi que réchauffement associé. Similarly, the tolerances are generally proportional to the dimensions. A smaller dimension therefore induces a smaller gap between the minimum cut game and the maximum cut game. The play in the cup is better controlled, which also implies a better seal. In addition, the reduction of the joint / shaft contact surface and its location on a smaller diameter reduce the friction torque generated during the rotation of the shaft, as well as associated heating.
De plus, un joint de diamètre plus petit permet un encombrement optimisé du compresseur de suralimentation électrique.  In addition, a smaller diameter seal allows an optimized size of the electric supercharger.
La portée de la présente invention ne se limite pas aux détails donnés ci-dessus et permet des modes de réalisation sous de nombreuses autres formes spécifiques sans s'éloigner du domaine d'application de l'invention. Par conséquent, les présents modes de réalisation doivent être considérés à titre d'illustration, et peuvent être modifiés sans toutefois sortir de la portée définie par les revendications. The scope of the present invention is not limited to the details given above and allows embodiments in many other specific forms without departing from the scope of the invention. Therefore, the present embodiments should be considered by way of illustration, and may be modified without departing from the scope defined by the claims.

Claims

REVENDICATIONS
1. Système d'étanchéité, pour arbre (10) tournant de compresseur mécanique ou électrique, l'arbre (10) étant relié à au moins un compartiment (1, 2), l'arbre (10) comportant au moins un joint (5, 5', 6, 6') d'étanchéité disposé dans un évidement (15, 15', 16, 16') pour maintenir l'étanchéité du compartiment, le diamètre extérieur du joint étant inférieur ou égale à 10mm. 1. Sealing system, for shaft (10) rotating mechanical or electrical compressor, the shaft (10) being connected to at least one compartment (1, 2), the shaft (10) having at least one seal ( 5, 5 ', 6, 6') disposed in a recess (15, 15 ', 16, 16') to maintain the tightness of the compartment, the outer diameter of the seal being less than or equal to 10mm.
2. Système d'étanchéité selon la revendication 1 dans lequel le diamètre externe du joint (5, 5', 6, 6') est configuré de façon à ce que le joint (5, 5', 6, 6') soit apte à coopérer avec la face interne (142) d'un alésage (13) ménagé dans un corps (14) de compresseur.  The sealing system of claim 1 wherein the outer diameter of the seal (5, 5 ', 6, 6') is configured such that the seal (5, 5 ', 6, 6') is fit cooperating with the inner face (142) of a bore (13) in a compressor body (14).
3. Dispositif selon une des revendications 1 ou 2, dans lequel le joint (5, 5', 6, 6') est un segment élastique ouvert (51) en forme d'anneau.  3. Device according to one of claims 1 or 2, wherein the seal (5, 5 ', 6, 6') is an open elastic segment (51) ring-shaped.
4. Dispositif selon une des revendications 1 à 3, dans lequel le joint (5, 5', 6, 6') entoure l'arbre et est plaqué contre une paroi latérale (131) de l'évidement (15, 15', 16, 16').  4. Device according to one of claims 1 to 3, wherein the seal (5, 5 ', 6, 6') surrounds the shaft and is pressed against a side wall (131) of the recess (15, 15 ', 16, 16 ').
5. Dispositif selon une des revendications 1 à 4, dans lequel l'évidement (15, 15', 16, 16') est formé, directement dans l'arbre (10).  5. Device according to one of claims 1 to 4, wherein the recess (15, 15 ', 16, 16') is formed directly in the shaft (10).
6. Dispositif selon une des revendications 1 à 4, dans lequel l'évidement (15, 15', 16, 16') est formé par une pièce supplémentaire (17) fixée à l'arbre (10).  6. Device according to one of claims 1 to 4, wherein the recess (15, 15 ', 16, 16') is formed by an additional piece (17) attached to the shaft (10).
7. Dispositif selon la revendication 6, dans lequel la pièce supplémentaire (17) à la forme d'une bague dans laquelle est creusé l'évidement (15, 15', 16, 16').  7. Device according to claim 6, wherein the additional piece (17) in the form of a ring in which is hollowed the recess (15, 15 ', 16, 16').
8. Dispositif selon une des revendications 6 à 7, dans lequel la pièce supplémentaire (17) est formé en une seule partie (17) ou en deux parties.  8. Device according to one of claims 6 to 7, wherein the additional piece (17) is formed in a single portion (17) or in two parts.
9. Dispositif selon une des revendications 1 à 8, comportant deux joints (5, 5', 6, 6').  9. Device according to one of claims 1 to 8, comprising two seals (5, 5 ', 6, 6').
10. Compresseur mécanique ou électrique équipé d'un système d'étanchéité selon une des revendications 1 à 9. Mechanical or electrical compressor equipped with a sealing system according to one of claims 1 to 9.
EP16724443.3A 2015-04-30 2016-05-02 Improved sealing system for a rotating shaft Pending EP3292327A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1553933A FR3035698B1 (en) 2015-04-30 2015-04-30 IMPROVED SEALING SYSTEM FOR ROTATING SHAFT
PCT/FR2016/051027 WO2016174374A1 (en) 2015-04-30 2016-05-02 Improved sealing system for a rotating shaft

Publications (1)

Publication Number Publication Date
EP3292327A1 true EP3292327A1 (en) 2018-03-14

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Application Number Title Priority Date Filing Date
EP16724443.3A Pending EP3292327A1 (en) 2015-04-30 2016-05-02 Improved sealing system for a rotating shaft

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EP (1) EP3292327A1 (en)
FR (1) FR3035698B1 (en)
WO (1) WO2016174374A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
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

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1947373A1 (en) * 2007-01-19 2008-07-23 ABB Turbo Systems AG Sealing arrangement
DE102013203521A1 (en) * 2013-03-01 2014-09-04 Schaeffler Technologies Gmbh & Co. Kg Sealing arrangement of an exhaust gas turbocharger, and turbocharger shaft for an exhaust gas turbocharger

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FR3035698A1 (en) 2016-11-04
WO2016174374A1 (en) 2016-11-03

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