EP3677776A1 - Elektrischer verbindungsstecker für einen elektrischen kompressor einer klimaanlage - Google Patents

Elektrischer verbindungsstecker für einen elektrischen kompressor einer klimaanlage Download PDF

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Publication number
EP3677776A1
EP3677776A1 EP19150263.2A EP19150263A EP3677776A1 EP 3677776 A1 EP3677776 A1 EP 3677776A1 EP 19150263 A EP19150263 A EP 19150263A EP 3677776 A1 EP3677776 A1 EP 3677776A1
Authority
EP
European Patent Office
Prior art keywords
housing
electrical
electrical connector
dielectric material
electric
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Withdrawn
Application number
EP19150263.2A
Other languages
English (en)
French (fr)
Inventor
Augustin Bellet
Imed Guitari
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 Japan Co Ltd
Original Assignee
Valeo Japan Co Ltd
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 Japan Co Ltd filed Critical Valeo Japan Co Ltd
Priority to EP19150263.2A priority Critical patent/EP3677776A1/de
Publication of EP3677776A1 publication Critical patent/EP3677776A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/46—Bases; Cases
    • H01R13/52—Dustproof, splashproof, drip-proof, waterproof, or flameproof cases
    • H01R13/5205—Sealing means between cable and housing, e.g. grommet
    • H01R13/5208—Sealing means between cable and housing, e.g. grommet having at least two cable receiving openings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/007—General arrangements of parts; Frames and supporting elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C18/20—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with dissimilar tooth forms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/80—Other components
    • F04C2240/803—Electric connectors or cables; Fittings therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/80—Other components
    • F04C2240/808—Electronic circuits (e.g. inverters) installed inside the machine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/008—Hermetic pumps

Definitions

  • the present invention relates to the field of electric compressors for air conditioning installations and more particularly to the means of connection between different components of these electric compressors.
  • An air conditioning installation of a motor vehicle comprises a closed circuit inside which a coolant circulates. Successively according to the direction of circulation of the refrigerant fluid through it, the closed circuit essentially comprises a condenser, a pressure reducer, an evaporator and a compressor, in particular an electric compressor.
  • the electric compressor comprises a housing which delimits a cavity and a housing separated from each other by a wall of the housing and in which are received respectively a control module and an electric motor controlled by this control module.
  • the housing is further provided with an inlet mouth through which the refrigerant is admitted at low pressure into the interior of the housing. The refrigerant then flows through the housing from the inlet mouth to a compression mechanism implemented by the electric motor and also received in the housing of the housing.
  • An outlet mouth is in communication with the compression mechanism for the evacuation of the high pressure refrigerant fluid out of the housing, following its compression.
  • the coolant circulates in the housing receiving the electric motor and the compression mechanism.
  • the wall of the housing separating the cavity from the housing must be sealed to prevent any introduction of coolant into the cavity, while allowing a connection between the control module and the electric motor.
  • the document US2012230851 discloses a compressor in which the wall of the housing separating the cavity from the housing includes an orifice allowing the passage of an electrical connector 100 which comprises a base 110 and three electrical conductors 120 and which makes it possible to make said electrical connection between the motor and the control module.
  • an electrical connector 100 which comprises a base 110 and three electrical conductors 120 and which makes it possible to make said electrical connection between the motor and the control module.
  • a single sealing device 130 is then placed around the base 110, such a sealing device 130 then surrounding all of the electrical conductors 120 of this electrical connector 100.
  • Such an electrical connector 100 is for example illustrated on the figure 1 .
  • the refrigerant flowing through the electric compressor can for example be a supercritical fluid which has a high operating pressure. This pressure is then exerted on a large surface of the electrical connector, thus generating a particularly high bearing force on the sealing device. This can result in a leak between the housing in which the refrigerant circulates and the cavity in which the control module is received. Such a leak must be avoided because it results in irreversible damage to the control module, and concomitantly to the electric compressor.
  • the present invention falls within this context and proposes an electrical connector making it possible to perpetuate the seal between the housing and the cavity of the compressor housing.
  • An object of the present invention thus relates to an electrical connector intended for an electrical compressor of an air conditioning installation, the electrical connector comprising at least one base through which at least two electrical conductors pass, at least one dielectric material being arranged around of each electrical conductor.
  • the electrical connector comprises at least two sealing devices, each of these sealing devices being arranged around only one of the electrical conductors.
  • each electrical conductor is surrounded by a sealing device which is specific to it.
  • the electrical connector comprises three electrical conductors and three sealing devices, each sealing device being arranged around only one of the electrical conductors.
  • the electrical connector is thus adapted to transport a three-phase electrical supply.
  • each sealing device has a section equal to or substantially equal to the electrical connector around which it is arranged. This results in a reduction of the bearing force on each sealing device, and, consequently, the electrical connector is exposed to pressure on a smaller surface. Thus, the seal at the electrical connector is improved in the sense that it is made more reliable.
  • the sealing devices are interconnected by a bridge.
  • This bridge is advantageously unique between two immediately adjacent sealing devices.
  • this bridge is made of the same material as the material constituting the sealing devices. It is understood that these sealing devices can thus form a one-piece assembly, that is to say an assembly which cannot be separated without causing the deterioration of one of the sealing devices.
  • the dielectric material passes through the base.
  • Such a dielectric material therefore extends from one face to the other of the base, while ensuring a seal against the coolant at the level of the contact between the dielectric material and the electrical conductor concerned.
  • each sealing device surrounds at least the second dielectric material. It is understood here that a plane perpendicular to a longitudinal direction of the electrical conductor passes both through this second dielectric material and through the sealing device which is surrounded by this second dielectric material.
  • Each electrical conductor of the electrical connector extends mainly in a longitudinal direction.
  • the first dielectric material and the second dielectric material are arranged one after the other along this longitudinal direction.
  • the second dielectric material is outside the base of the electrical connector according to the invention.
  • the first dielectric material comprises glass. More precisely, the first dielectric material is glass. This material is chosen in particular because, in addition to ensuring good electrical insulation, the glass provides a seal between the spaces it separates by being melted around the electrical conductor.
  • the second dielectric material comprises ceramic. More specifically, the second dielectric material is ceramic. Ceramic is particularly chosen because it has, in addition to its electrical insulating properties, high mechanical strength, low density, high hardness and high resistance to wear.
  • each electrical conductor is produced by a rigid pin.
  • the term “rigid spindle” is understood to mean an element capable of conducting an electric current and which withstands torsional and shear forces. In other words, this rigid pin does not bend under its own weight, as can be the case with a flexible electric cable.
  • the invention also relates to an electric compressor comprising a housing delimiting at least one cavity and a housing separated from one another by an internal wall of the housing, the housing receiving at least one electric motor and the cavity housing at least one module. for controlling the electric motor, the control module being electrically connected to the electric motor by an electric connector in accordance with the present invention.
  • the electrical connector is fixed to the internal wall of the housing. It is then understood that the internal wall of the housing includes as many orifices as the electrical connector comprises electrical conductors. Thus, the internal wall of the housing comprises at least two separate orifices. It will be noted that each electrical conductor of this electrical connector passes through this internal wall independently of the other electrical conductors.
  • the internal wall of the housing comprises a counterbore around each orifice, each counterbore forming a housing for receiving one of the sealing devices.
  • each electric conductor is thus surrounded by a sealing device which is specific to it. The sealing of the internal wall of the housing is thus ensured at the level of each orifice formed in this internal wall.
  • the compressor is traversed by a coolant capable of passing in and / or around the elements received in the housing of the housing, this coolant being a supercritical fluid.
  • this refrigerant is carbon dioxide.
  • the housing can be produced from an assembly of several parts manufactured separately from each other.
  • the housing delimiting the housing, the cavity and comprising the internal wall may result from a single monobloc piece, advantageously produced by molding.
  • the figure 1 illustrates an electrical connector 100 known from the document US2012230851 .
  • the figure 2 illustrates an electric compressor 1 according to the present invention comprising a box 2 of generally cylindrical conformation, closed by a cover 3.
  • This housing 2 delimits at least one cavity 4 and a housing 5 separated from each other by an internal wall 6 of the housing 2.
  • the cavity 4 houses a control module 7, while the housing 5 receives a compression mechanism 9 and a motorization, in this case an electric motor 8.
  • this electric compressor 1 extends mainly in a longitudinal direction X and it is noted that the housing 5, the internal wall 6 of the housing 2, the cavity 4, the control module 7 and the cover 3 of this housing 2 are aligned, in this order, along the longitudinal direction X.
  • the electric compressor 1 of the invention is thus a longitudinal electric compressor, in contrast to the electric compressors where the control module is arranged radially.
  • the housing 2 of the electric compressor 1 can be made of aluminum or an aluminum alloy.
  • This box 2 of the electric compressor 1 can for example be composed of several parts manufactured separately and then joined together.
  • this housing 2 can be produced by a single piece, this single piece being for example obtained by molding.
  • the housing 2 also comprises an inlet mouth 10 and an outlet mouth 11 configured to allow the entry and exit of a refrigerant fluid in and out of the case 2. More particularly, this mouth inlet 10 and this outlet mouth 11 are formed in a portion of the housing 2 delimiting the housing 5 in which the compression mechanism 9 and the electric motor are received. The housing 2 is therefore configured so that the coolant circulates along the less of the electric motor 8, in particular for cooling it.
  • This coolant thus circulates in the housing 5 where it is compressed by the compression mechanism 9 driven in rotation by a drive shaft 12 of the electric motor 8.
  • the compression mechanism 9 can for example be a spiral compression mechanism, of which one spiral is fixed while the other spiral oscillates.
  • the electric motor 8 is electrically powered and controlled by the control module 7 housed in the cavity 4 of the housing 2 of the electric compressor 1.
  • This control module 7 comprises an electronic card on which are fixed a plurality of electronic components - not illustrated here - and this control module 7 is supplied by an electrical supply harness 13 electrically connected to an electrical network of a vehicle in which the electric compressor is mounted 1.
  • the power supply bundle 13 comprises, at one of its longitudinal ends, a connection element 19 which passes through the cover 3 of the housing 2.
  • This connection element 19 comprises a female element 190 to which the harness of power supply 13 and a male element 191 which is plugged into the female element 190 at one end and which is connected to the control module 17 at another end, these two ends being opposite along the longitudinal direction X.
  • an electrical connector 14 passes through the internal wall 6 of the housing 2.
  • a coolant circulates in the housing 5 partially delimited by this internal wall 6.
  • several sealing devices are arranged between the electrical connector 14 and the internal wall 6 of the housing 2.
  • the figure 3 is a sectional view, taken along a longitudinal plane passing through electrical conductors 141 of the electrical connector 14 and in which the longitudinal direction X is inscribed.
  • the electrical connector 14 which makes it possible to make the electrical connection between the control module 7 and the electric motor - not illustrated in the figure 3 - Includes a base 140 and, according to the example illustrated, three electrical conductors 141 extending respectively parallel to the longitudinal direction X. These electrical conductors 141 are capable of conducting an electric current from the control module 7 and towards the electric motor of the compressor.
  • these electrical conductors 141 are rigid pins made of a metallic material, for example steel.
  • the internal wall 6 of the housing separating the housing 5 from the cavity 4 comprises three orifices 60, through which the electrical conductors 141 pass.
  • each electrical conductor 141 passes through the internal wall 6 via one of these orifices 60.
  • a first longitudinal end of each electrical conductor 141 extends into the housing 5 and a second longitudinal end of each electrical conductor 141 extends in turn into the cavity 4.
  • the electric motor received in the housing 5 comprises an electric harness to which is fixed a female connection element - not illustrated here - capable of being plugged into the three electric conductors 141, and more particularly the first longitudinal ends of these electric conductors 141.
  • These electrical conductors 141 are also electrically connected to the control module 7 via electrical connection lugs 20 carried by the electronic card of the control module 7. As illustrated in the figure 3 , each electrical conductor 141, and more particularly the second longitudinal ends of these electrical conductors 141, is thus connected to the control module 7 by a terminal 20 for its own electrical connection.
  • the housing includes aluminum or an aluminum alloy.
  • the latter are surrounded by at least two dielectric materials 15, 16 arranged one after the other along the longitudinal direction X.
  • a first dielectric material 15 is arranged in the base 140 of the electrical connector 14 and a second dielectric material 16, distinct from the first dielectric material 15, is in turn arranged at least in the internal wall 6 of the housing, this first dielectric material 15 and this second dielectric material 16 both being arranged around the electrical conductors 141.
  • the first dielectric material 15 includes glass.
  • this material makes it possible on the one hand to electrically isolate the electrical conductor 141 from the internal wall 6 of the housing and, on the other hand, contributes to the sealing of this internal wall 6. It is understood figure 3 that this first dielectric material 15 here prevents any migration of the refrigerant fluid along the electrical conductors 141 as well as along holes made in the base 140 and through which these electrical conductors 141 pass.
  • the second dielectric material 16 comprises ceramic and makes it possible to electrically isolate the electrical conductors 141 around which it is arranged from the internal wall 6 of the housing.
  • the first dielectric material 15 is arranged between each electrical conductor 141 and the base 140 of the electrical connector 14 and the second dielectric material 16 is in turn arranged between each electrical conductor 141 and the internal wall 6 of the housing.
  • the choice of these materials results from the fact that the voltage which circulates on the electrical conductors 141 is between 300V and 600V, which requires significant electrical insulation.
  • the refrigerant which circulates in the housing 5 comprises a lubricant which promotes electric arcs, it is therefore necessary to properly electrically insulate the electrical conductors 141, in particular at the level of their portion which extends into the housing 5.
  • the second dielectric material 16 thus at least partially surrounds a portion of each electrical conductor 141 which extends beyond the internal wall 6, in the housing 5.
  • the ceramic advantageously has electrical insulation properties superior to glass, which ensures effective electrical insulation even on these portions of electrical conductors 141 directly in contact with the refrigerant to which the lubricant is added.
  • the electrical connector 14 also comprises several sealing devices 17, in this case three sealing devices 17, respectively arranged around one of the electrical conductors 141. Viewed in projection, the shape of the sealing device 17 is identical. in the form of an external wall of the electrical conductor 141. These are circles. These sealing devices 17 prevent in particular a migration of the refrigerant fluid along the base 140, that is to say between a face of this base 140 and a face of the internal wall 6 which faces the cavity 4 In other words, these sealing devices 17 provide a seal at the interface between the internal wall 6 of the housing and the base 140 of the electrical connector 14.
  • a plurality of counterbores 18 are formed in the internal wall 6, around the electrical conductors 141, and more precisely around the second dielectric material 16 surrounding each electrical conductor 141.
  • each sealing device 17 is arranged in the one of these counterbores 18.
  • these sealing devices 17 can be O-rings.
  • the housing 5 is traversed by the supercritical fluid, for example by carbon dioxide, which therefore has a high operating pressure.
  • the operating pressure of the electric compressor according to the invention is between 15 bars and 110 bars at low pressure.
  • the burst pressure at low pressure is 260 bars.
  • the term “specific organization” means that, according to the invention, the total area of the electrical connector 14 is less than the area of this electrical connector 14 on which the pressure of this supercritical fluid is effectively exerted. It is in particular this difference in surfaces which allows this electrical connector 14 to resist these high pressures.
  • each sealing device 17 exposed to this pressure is relatively reduced, which advantageously makes it possible to make the sealing provided by these sealing devices more reliable.
  • the figure 4 is a top view of the sealing devices 17 arranged between the electrical connector and the internal wall of the housing, shown according to a particular embodiment.
  • the sealing devices 17 are interconnected by bridges 170.
  • these bridges 170 are of the same material as the sealing devices 17, these three sealing devices 17 thus forming a one-piece assembly .
  • “One-piece assembly” is understood to mean the fact that the sealing devices cannot be separated from one another without causing deterioration of at least one of them. Such an organization makes it easier to install the sealing devices 17 during the assembly of the electrical connector on the electric compressor.
  • the present invention allows, by simple and inexpensive means, to perpetuate the seal between two spaces of a high pressure electric compressor.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)
EP19150263.2A 2019-01-03 2019-01-03 Elektrischer verbindungsstecker für einen elektrischen kompressor einer klimaanlage Withdrawn EP3677776A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19150263.2A EP3677776A1 (de) 2019-01-03 2019-01-03 Elektrischer verbindungsstecker für einen elektrischen kompressor einer klimaanlage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19150263.2A EP3677776A1 (de) 2019-01-03 2019-01-03 Elektrischer verbindungsstecker für einen elektrischen kompressor einer klimaanlage

Publications (1)

Publication Number Publication Date
EP3677776A1 true EP3677776A1 (de) 2020-07-08

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EP19150263.2A Withdrawn EP3677776A1 (de) 2019-01-03 2019-01-03 Elektrischer verbindungsstecker für einen elektrischen kompressor einer klimaanlage

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2133571A2 (de) * 2008-06-09 2009-12-16 Kabushiki Kaisha Toyota Jidoshokki Motorbetriebener Verdichter
EP2299118A2 (de) * 2009-09-08 2011-03-23 Kabushiki Kaisha Toyota Jidoshokki Motorbetriebener Verdichter
EP2439826A1 (de) * 2010-10-07 2012-04-11 Kabushiki Kaisha Toyota Jidoshokki Kabeleinführungsdichtung für motorbetriebener Verdichter
US20120230851A1 (en) 2011-03-08 2012-09-13 Kabushiki Kaisha Toyota Jidoshokki Electric compressor
FR3030917A1 (de) * 2014-12-19 2016-06-24 Valeo Japan Co Ltd
WO2018048086A1 (ko) * 2016-09-08 2018-03-15 한온시스템 주식회사 압축기
DE102018104681A1 (de) * 2017-03-03 2018-09-06 Kabushiki Kaisha Toyota Jidoshokki Elektrischer Kompressor

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2133571A2 (de) * 2008-06-09 2009-12-16 Kabushiki Kaisha Toyota Jidoshokki Motorbetriebener Verdichter
EP2299118A2 (de) * 2009-09-08 2011-03-23 Kabushiki Kaisha Toyota Jidoshokki Motorbetriebener Verdichter
EP2439826A1 (de) * 2010-10-07 2012-04-11 Kabushiki Kaisha Toyota Jidoshokki Kabeleinführungsdichtung für motorbetriebener Verdichter
US20120230851A1 (en) 2011-03-08 2012-09-13 Kabushiki Kaisha Toyota Jidoshokki Electric compressor
FR3030917A1 (de) * 2014-12-19 2016-06-24 Valeo Japan Co Ltd
WO2018048086A1 (ko) * 2016-09-08 2018-03-15 한온시스템 주식회사 압축기
DE102018104681A1 (de) * 2017-03-03 2018-09-06 Kabushiki Kaisha Toyota Jidoshokki Elektrischer Kompressor

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