EP3292327A1 - Système d'étanchéité amélioré pour arbre tournant - Google Patents
Système d'étanchéité amélioré pour arbre tournantInfo
- 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.)
- Withdrawn
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 20
- 239000003344 environmental pollutant Substances 0.000 description 6
- 231100000719 pollutant Toxicity 0.000 description 6
- 230000000694 effects Effects 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1553933A FR3035698B1 (fr) | 2015-04-30 | 2015-04-30 | Systeme d'etancheite ameliore pour arbre tournant |
PCT/FR2016/051027 WO2016174374A1 (fr) | 2015-04-30 | 2016-05-02 | Système d'étanchéité amélioré pour arbre tournant |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3292327A1 true EP3292327A1 (fr) | 2018-03-14 |
Family
ID=53496816
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16724443.3A Withdrawn EP3292327A1 (fr) | 2015-04-30 | 2016-05-02 | Système d'étanchéité amélioré pour arbre tournant |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3292327A1 (fr) |
FR (1) | FR3035698B1 (fr) |
WO (1) | WO2016174374A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3068086B1 (fr) * | 2017-06-25 | 2019-07-19 | Valeo Systemes De Controle Moteur | Compresseur electrique avec trou d'event |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2320032A2 (fr) * | 2009-11-10 | 2011-05-11 | Honeywell International Inc. | Ensemble d'arbre étanche pour turbocompresseurs |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1947373A1 (fr) * | 2007-01-19 | 2008-07-23 | ABB Turbo Systems AG | Dispositif d'étanchéité |
DE102013203521A1 (de) * | 2013-03-01 | 2014-09-04 | Schaeffler Technologies Gmbh & Co. Kg | Dichtungsanordnung eines Abgasturboladers, sowie Turboladerwelle für einen Abgasturbolader |
-
2015
- 2015-04-30 FR FR1553933A patent/FR3035698B1/fr active Active
-
2016
- 2016-05-02 WO PCT/FR2016/051027 patent/WO2016174374A1/fr active Application Filing
- 2016-05-02 EP EP16724443.3A patent/EP3292327A1/fr not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2320032A2 (fr) * | 2009-11-10 | 2011-05-11 | Honeywell International Inc. | Ensemble d'arbre étanche pour turbocompresseurs |
Also Published As
Publication number | Publication date |
---|---|
WO2016174374A1 (fr) | 2016-11-03 |
FR3035698B1 (fr) | 2018-02-16 |
FR3035698A1 (fr) | 2016-11-04 |
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Inventor name: MARTIN, NICOLAS Inventor name: KNIGHT, STEPHEN |
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P01 | Opt-out of the competence of the unified patent court (upc) registered |
Effective date: 20230528 |
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RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: VALEO ELECTRIFICATION |
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18D | Application deemed to be withdrawn |
Effective date: 20240622 |