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
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
  • F04D17/08—Centrifugal pumps
  • F04D17/10—Centrifugal pumps for compressing or evacuating
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D29/00—Details, component parts, or accessories
  • F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
  • F04D29/056—Bearings
  • F04D29/059—Roller bearings
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D29/00—Details, component parts, or accessories
  • F04D29/08—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
• • 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
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
  • F16C33/72—Sealings
  • F16C33/76—Sealings of ball or roller bearings
  • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
  • F16C33/7886—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted outside the gap between the inner and outer races, e.g. sealing rings mounted to an end face or outer surface of a race
• • 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
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
  • F16C19/54—Systems consisting of a plurality of bearings with rolling friction
• • 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
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C2360/00—Engines or pumps
  • F16C2360/44—Centrifugal 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 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 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 in which a compressor wheel is arranged and comprising at least one guide means, the system sealing device comprising at least one sealing means arranged upstream of the guide means, relative to the wheel.
• Such a sealing means makes it possible to obtain maximum sealing with respect to the pollutants coming from the second compartment of the compressor.
• the sealing means is a washer, preferably a flexible washer.
• the sealing means is disposed at a bearing face, face perpendicular to the longitudinal axis X of the compressor shaft.
• the sealing means is gripped by its end, corresponding to its outer diameter, between an outer ring of the bearing and the bottom of a bearing housing in a compressor body.
• the end of the sealing means corresponding to the internal diameter of the sealing means, is configured to rub axially on an inner ring of the guide means.
• an end of the sealing means corresponding to the internal diameter of the sealing means, is configured to rub axially on a shoulder of the shaft.
• the system comprises at least one seal.
• the system has two seals. According to one embodiment of the invention, the system has a vent hole opening between the 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 an embodiment of a part of a device according to the invention.
• the present invention relates to a sealing system for a rotating shaft.
• 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).
• the motor is a permanent magnet motor.
• the term compressor means indifferently mechanical compressor or electric compressor, unless additional precision.
• the shaft 10 is a conventional longitudinal shaft, cylindrical.
• 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 shaft 10 rotates generally at a speed between 0 and 300000 rpm and preferably between 50000 and 80000 rpm.
• the shaft 10 extends in and between at least two compartments 1, 2. More specifically, an end of the shaft opens into a first compartment 1 of the compressor.
• the first compartment 1 contains drive means of the shaft, including means for guiding rotation 4.
• the first compartment 1 comprises an electric motor .
• the other end of the shaft opens into a second compartment 2 of the compressor.
• the second compartment 2 comprises the wheel 3 of the compressor. The shaft 10 is thus rotated by the guide 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 guide means 4 are formed by at least one bearing 4.
• the bearings 4 are two in number, arranged on either side of the electric motor (not shown).
• the invention provides a sealing system comprising at least one sealing means 8 arranged upstream of the guiding means 4 with respect to at the wheel 3.
• the sealing system according to the invention is disposed between the first and the second compartment so as to seal between the two compartments.
• the sealing means 8 is a washer, preferably a flexible washer.
• this sealing means 8 is disposed at a bearing face, face perpendicular to the longitudinal axis X of the shaft 10 of the compressor. More specifically, the sealing means 8 is disposed at the level of the face of the bearing 4 facing the wheel 3.
• the sealing means 8 is fixed relative to the body 14 of the compressor.
• the sealing means 8 is gripped by its end corresponding to the outer diameter 81 between the outer ring of the bearing and the bottom of the housing 42 of the bearing in the body 14.
• the end corresponding to the internal diameter 82 of the sealing means 8 is configured to rub axially on the inner ring 43 of the bearing 4.
• the shaft 10 includes a not illustrated shoulder.
• the end corresponding to the internal diameter 82 of the sealing means 8 is configured to rub axially on the shoulder of the shaft 10.
• the advantage of the presence of such a sealing means is that the overpressure created upstream of the sealing means, that is to say the compressor wheel side 3, makes it possible to exert a plating force sealing means on the rotating part against which it rubs.
• the internal diameter and the external diameter are adjusted so as to obtain a compromise between:
• the inner and outer diameter dimensions of the washer have a dual impact on both the flexibility and the pressure application surface.
• the thickness of the sealing means 8 is configured to optimize the flexibility of the sealing means.
• the sealing means 8 have the following dimensions:
• the sealing means is made of steel or stainless steel spring.
• the sealing means comprises an anti-friction surface treatment, and for example a treatment based on polytetrafluoroethylene (or PTFE).
• the inner ring of the bearing or the shoulder of the shaft when it is present comprises an anti-friction surface treatment, and for example a treatment based on PTFE.
• the sealing system also comprises at least one sealing gasket 5, 6.
• the seal 5, 6 surrounds the shaft and is disposed in a recess.
• seal means a sealing segment
• 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, 6 are arranged in two recesses.
• 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 7 arranged to open into a space between the two seals 5, 6.
• This vent hole 7 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 7 thus prevents the accumulation of these pollutants between the two seals 5, 6.

Landscapes

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

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=55345923

Family Applications (1)

Country Status (3)

Cited By (1)

Families Citing this family (1)

Citations (5)

• 2015
  • 2015-09-28 FR FR1559138A patent/FR3043149A1/fr active Pending
• 2016
  • 2016-09-23 WO PCT/FR2016/052419 patent/WO2017055717A1/fr active Application Filing
  • 2016-09-23 DE DE112016004378.3T patent/DE112016004378T5/de not_active Withdrawn

Patent Citations (5)

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