WO2023232292A1 - Système de compresseur de type roots - Google Patents

Système de compresseur de type roots Download PDF

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Publication number
WO2023232292A1
WO2023232292A1 PCT/EP2023/025261 EP2023025261W WO2023232292A1 WO 2023232292 A1 WO2023232292 A1 WO 2023232292A1 EP 2023025261 W EP2023025261 W EP 2023025261W WO 2023232292 A1 WO2023232292 A1 WO 2023232292A1
Authority
WO
WIPO (PCT)
Prior art keywords
compressor
assembly
sound
layer
pair
Prior art date
Application number
PCT/EP2023/025261
Other languages
English (en)
Inventor
Sagar Bhikajirao MANE
Chinmoy ROY
Vinay Vijay KELKAR
Vedant Netaji GAIKWAD
Original Assignee
Eaton Intelligent Power Limited
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 Eaton Intelligent Power Limited filed Critical Eaton Intelligent Power Limited
Publication of WO2023232292A1 publication Critical patent/WO2023232292A1/fr

Links

Classifications

    • 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
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/06—Silencing
    • F04C29/063—Sound absorbing materials
    • 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
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/0027—Pulsation and noise damping means
    • F04B39/0033—Pulsation and noise damping means with encapsulations
    • 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
    • F04C18/126—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 radially from the rotor body extending elements, not necessarily co-operating with corresponding recesses in the other rotor, e.g. lobes, Roots type

Definitions

  • This disclosure relates to compressors, and more particularly to those used in air compressor applications.
  • Roots-type compressors such as superchargers are known. Such devices are known to radiate noise and to leak lubrication oil into the main air flowpath. Improvements are desired.
  • a compressor assembly can include a compressor including a main housing having an inlet and an outlet, and can include a pair of rotors arranged within an internal cavity, each of the pair of rotors having a plurality of lobes.
  • the compressor assembly can also include a sound attenuation assembly at least partially surrounding an outer perimeter of the main housing, the sound attenuation assembly including a sound attenuating layer.
  • the main housing and the sound attenuating layer are separated by an interstitial gap.
  • the sound attenuating layer is a foam material.
  • the sound attenuating layer includes a plurality of separate parts.
  • the sound attenuation assembly includes an outer layer surrounding the sound attenuating layer.
  • the outer layer is formed from a sheet metal material.
  • the outer layer is formed from a plurality of separate parts.
  • a sound attenuation assembly for a compressor can include an outer layer and an inner layer disposed within the outer layer, the inner layer being formed from a sound attenuating material, the inner layer defining a perimeter wall extending between a first end wall and a second end wall, the first end wall including a first opening for surrounding a first end of the compressor such that a drive mechanism can be connected to the compressor, the second end wall including a second opening for surrounding a second end of the compressor having an air inlet opening, the perimeter wall having an opening through which an outlet of the compressor can extend.
  • the sound attenuating layer is a foam material.
  • the sound attenuating layer includes a plurality of separate parts.
  • the sound attenuation assembly includes an outer layer surrounding the sound attenuating layer.
  • the outer layer is formed from a sheet metal material.
  • the outer layer is formed from a plurality of separate parts.
  • a compressor can include a housing assembly having a first opening and a second opening in fluid communication with an internal cavity; a pair of rotors arranged within the internal cavity, each of the pair of rotors having a plurality of lobes; a pair of shafts supporting the pair of rotors; a pair of seal assemblies providing a seal between the pair of shafts and the housing assembly, each of the pair of seal assemblies including a first seal member and a spaced apart second seal member, wherein the housing assembly defines a passageway extending from a space defined between the first seal member and the second seal member to an exterior of the housing assembly; and a breather valve in fluid communication with the passageway, the breather valve opening at a predetermined fluid pressure.
  • the second seal member has wiper seals.
  • the compressor is a Roots-type compressor.
  • a sound attenuation assembly is further provided that at least partially surrounds an outer perimeter of the housing assembly, the sound attenuation assembly including a sound attenuating layer.
  • the housing assembly and the sound attenuating layer are separated by an interstitial gap.
  • the sound attenuating layer is a foam material.
  • the sound attenuating layer includes a plurality of separate parts.
  • Figure 1 is a perspective view of a compressor assembly having features that are examples of inventive aspects in accordance with the principles of the present disclosure.
  • Figure 2 is an exploded perspective view of the compressor assembly shown in Figure 1.
  • Figure 3 is a cross-sectional side view of an example encapsulation housing of the compressor assembly shown in Figure 1 with the motor and compressor shown schematically as solid blocks for ease in viewing the encapsulation housing.
  • Figure 4 is a side elevational view of the compressor assembly shown in Figure 1, with the encapsulation housing removed.
  • Figure 5 is a first end perspective view of a compressor and encapsulation housing of the compressor assembly of Figure 1 with a breather valve also installed to extend from the compressor, through the encapsulation housing, to an exterior of the compressor assembly.
  • Figure 6 is a second end perspective view of the compressor and encapsulation housing of Figure 5.
  • Figure 7 is a perspective view of the compressor of the compressor assembly of Figure 5.
  • Figure 8 is a cross-sectional view of the compressor shown in Figure 7.
  • Figure 9 is a partial view of the compressor shown in Figure 8.
  • Figure 10 is an enlarged view of a portion of Figure 1.
  • Figure 11 is an enlarged view of a portion of Figure 1.
  • Figure 12 is a perspective view of the encapsulation housing of the compressor shown in Figure 1.
  • Figure 13 is a cross-sectional perspective view of the encapsulation housing shown in Figure 1.
  • Figure 14 is a perspective view of a breather valve of the compressor shown in Figure 7.
  • Figure 15 shows a first step in an assembly procedure for the compressor assembly of Figure 1.
  • Figure 16 shows a second step in an assembly procedure for the compressor assembly of Figure 1.
  • Figure 17 shows a third step in an assembly procedure for the compressor assembly of Figure 1.
  • Figure 18 shows a fourth step in an assembly procedure for the compressor assembly of Figure 1.
  • Figure 19 shows a fifth step in an assembly procedure for the compressor assembly of Figure 1.
  • Figure 20 shows a sixth step in an assembly procedure for the compressor assembly of Figure 1.
  • Figure 21 shows a seventh step in an assembly procedure for the compressor assembly of Figure 1.
  • Figure 22 shows an eighth step in an assembly procedure for the compressor assembly of Figure 1.
  • This disclosure is related to compressor devices for use in multiple applications.
  • the disclosed devices are usable in fuel cell applications (stationary and mobile) where compressor will be supplying compressed air to fuel cell stack.
  • the compressor assembly 10 includes a compressor or device 100 within an encapsulation system 200, both of which are mounted to support plates 12, 14.
  • the compressor assembly 10 is further shown as including an electric motor 16 coupled to the compressor 100.
  • the compressor 100 compresses air which is delivered via an outlet structure 18 to, for example, a fuel cell air inlet.
  • the encapsulation system 200 operates to suppress or otherwise reduce noise generated by the compressor 100 to the surrounding area.
  • the electric motor 16 can be any desired type of electric motor and so is shown herein schematically.
  • the compressor 100 disclosed herein is shown as being a rotary device in the form of a Roots-type device. However, other types of devices can be used without departing from the concepts presented herein.
  • the compressor 100 can be provided with a main housing assembly 102 defining an internal cavity or passageway 104 extending between a first opening 106 and a second opening 108.
  • the first opening 106 is an air intake opening and the second opening 108 is an air outlet opening.
  • a pair of counterrotating rotor assemblies 110, 112 are disposed within the internal cavity 104 of the main housing assembly 102. Upon rotation of the rotors 110, 112, lobes of the rotors at least partially seal a working fluid against an interior side of the housing 102, at which point compression of the working fluid only occurs to the extent allowed by leakage.
  • the compressor can increase the amount of intake air delivered to a power plant, such as a fuel cell.
  • the compressor can be a blower or a supercharger of the type shown and described in US Patent 7,488,164 entitled OPTIMIZED HELIX ANGLE ROTORS FOR ROOTS- STYLE SUPERCHARGER.
  • US Patent 7,488,164 is hereby incorporated by reference in its entirety.
  • An additional example is provided at Patent Cooperation Treaty (PCT) International Publication Number WO 2013/148205, the disclosure of which is incorporated herein by reference in its entirety.
  • the rotors 110, 112 have lobes that are twisted or helically disposed along the length of the rotors 110, 112 (e.g., see Figure 8).
  • This design is in contrast to the construction of typical rotary screw devices and other similarly configured rotating equipment which have a dissimilar number of lobes (e.g., a male rotor with “n” lobes and a female rotor with “n+1” lobes).
  • the rotors 110, 112 are identical, wherein the rotors 110, 112 are oppositely arranged so that, as viewed from one axial end, the lobes of one rotor are twisted clockwise while the lobes of the meshing rotor are twisted counter-clockwise.
  • Other configurations are possible, such as a four-lobe rotor.
  • the first opening 106 is disposed generally orthogonal to a longitudinal axis X (see Figure 8) of the device 100 while the second opening 108 is disposed generally parallel to the longitudinal axis X.
  • the working fluid is a compressible fluid, such as atmospheric air.
  • the device 100 operates as a compressor, such as in a supercharger application, in which the rotors 110, 112 are rotated to generate and deliver a flow of the working fluid.
  • each of the rotors 1 10, 112 are respectively mounted to rotor shafts 114, 116.
  • a timing gear 117, 118 is respectively mounted to each shaft 114, 116.
  • the timing gears 117, 118 are intermeshed with each other to ensure that the rotor assemblies 108, 110 rotate synchronously such that interference between the rotor assemblies 108, 110 is avoided.
  • a coupling member 119 is coupled to the timing gear 117 by a plurality of pins 119a.
  • the coupling member is configured with receiving recesses 119b to receive additional pins from an input or output device such that power can be transferred to and/or from the compressor 100 via attached pulleys, gears, or the like.
  • Other embodiments are possible.
  • the shaft 114 could be provided with an extension portion or additional length extending beyond the timing gear 117 such that a pulley, gear, or coupling member can be attached directly to the shaft 114.
  • three pins 1 19a and three receiving recesses 119b are provided.
  • Other configurations are possible. For example, two and four pin arrangements.
  • the device 100 also can be provided with bearing assemblies 120, 122, 124, 126 for rotationally supporting the shafts 114, 116.
  • the bearing assemblies 120, 122 are supported within cavities of a bearing plate 128 which is mounted to the housing 102.
  • the bearing plate 128 forms an end surface of the internal cavity of the housing 102 and passageway 104.
  • the bearing assemblies 124, 126 are shown as being supported in recess or cavity portions of the housing 102.
  • the bearing plate 128, when removed, provides an opening through which the rotor assemblies 110, 112 can be installed and removed from the interior of the housing 102.
  • the device 100 also can be provided with sealing assemblies 130, 132 respectively mounted within cavities 128a, 128b of the bearing plate 128 to ensure that lubricating fluids associated with the timing gears 117, 118 do not leak into the passageway 104.
  • the sealing assemblies 130, 132 each include a first seal 130a, 132a and a spaced apart second seal 130b, 132b positioned in a series arrangement.
  • Each of the seals 130a, 130b, 132a, 132b provides sealing contact between the respective shafts 114, 116 and cavities 128a, 128b.
  • the seals 130b, 132b are provided with wiper-type seals which deflect in the direction towards the seals 130a, 132a, which creates greater resistance to fluid flow from the cavities 128a, 128b into the passageway 104.
  • the space between the seals 130a and 130b and 132a and 132b is vented to the atmosphere to reduce the likelihood of transmission of lubricating oil associated with the timing gears leaking into the passageway 104.
  • a first passageway 128c is provided in the bearing plate 128 extending between the cavities 128a, 128b while a second passageway 128d is provided extending from the cavity 128b to the exterior of the housing 102.
  • a breather valve 250 is mounted through an opening 102a in the housing 102 and extends to the passageway 128d.
  • the breather valve 250 is configured such that the valve opens at a predetermined pressure to relieve pressure in the cavities 128a, 128b and on the seals 130b, 132b, thereby minimizing the chances of fluid leakage past the seals 130b, 132b and into the passageway 104.
  • the breather valve 250 is a dual breather valve.
  • the compressor 100 can also include further components not illustrated in the drawings or discussed herein, that would be readily understood by a person skilled in the art to include.
  • the compressor 100 would be understood to include a cover mounted to the bearing plate to cover the timing gears 117, 118.
  • the compressor assembly 10 can include an encapsulation system 200 defining an internal cavity 201 within which the compressor 100 is disposed (see Figure 8).
  • the encapsulation system 200 is provided to reduce the transmission of noise generated by the compressor 100.
  • the encapsulation system 200 can be characterized as a sound attenuation housing that includes an outer layer 210 and an acoustically absorptive inner layer 220.
  • the outer layer 210 is a sound reflective material.
  • the outer layer 210 is a sound absorptive layer. Either of the inner and outer layers can have sound absorptive and sound reflective characteristics.
  • the inner layer is relatively more sound absorptive in comparison to the outer layer while the outer layer is relatively more sound reflective in comparison to the inner layer.
  • the outer layer 210 is formed from a metal material, such as bent sheet metal, and can be characterized as a protective or outer housing. As shown, the outer layer 210 is provided with a perimeter wall 212 extending between flanges 214, 216 which can be used for mounting the outer layer 210 to the support plates 12, 14 via fasteners.
  • the inner layer 220 is formed from a sound attenuating material such as a foam or fiberglass material, and can be characterized as a sound attenuating layer.
  • the inner layer 220 is formed from one or more foam sheets ranging in thickness from 10 millimeters to 15 millimeters.
  • the inner layer 220 includes a perimeter wall 222 extending between first and second end walls 224, 226. Each of the first and second end walls 224, 226 is provided with an opening 224a, 226a.
  • the openings 224a, 226a have a contour that matches the outer perimeter of the ends of the housing 102 such that the outer perimeter of the housing 102 is entirely encapsulated by the inner layer 220 such that the opening 108 is also encapsulated within the inner and outer layers 220, 210 and such that only axial end faces of the housing 102 are uncovered by the inner layer 220.
  • the end faces of the housing 102 are mounted to the support plates 12, 14.
  • the perimeter wall 222 is spaced from the opening 108 such that an internal volume results between the inner layer 220 and the opening 108 to accommodate the outlet structure 18.
  • a gap, interstitial space or volume, or empty space 201a exists between the inner layer 220 and the radial outer surfaces of the compressor 100 and outlet structure 18. The existence of a such a gap may aid in further reducing noise transmission from the compressor 10 in comparison to placing the inner layer 220 immediately adjacent the housing 102.
  • the outer layer 210 is provided with an opening 218 located in the perimeter wall 212 while the inner layer 220 is provided with an opening 228 in the perimeter wall 222.
  • the openings 218, 228 are coaxially aligned and face the opening 108 in the housing 102.
  • compressed fluid such as compressed air exits the opening 108 of the housing 102 and enters the outlet structure 18, which is disposed in the portion of the internal cavity 104 between the perimeter wall 222 and the opening 108.
  • a gasket or seal 219 can be provided at the location of the openings 218, 228 such that a seal can be formed with the outlet structure 18 (see Figure 18).
  • the outlet structure 18 is in fluid communication with an air inlet of a fuel cell.
  • the outer and inner layers 210, 220 are also respectively provided with openings 217, 229 through which the breather valve 250 extends.
  • the encapsulation system 200 can be provided in multiple parts that can be assembled around the compressor 100.
  • the outer layer 210 is provided with cooperating first and second parts 210a, 21 Ob that together form a full perimeter around the inner layer 220.
  • the inner layer 220 is shown as being provided with cooperating first, second, and third parts 220a, 220b, and 220c.
  • each of the first, second, and third parts 220a, 220b, 220c define a portion of the perimeter wall 222 with the first part 220a additionally defining the end wall 224 and the second part 220b additionally defining the end wall 226.
  • the first and second parts 220a, 220b are provided with an L-shape while the third part 220c is provided with a U-shape.
  • Other configurations are possible.
  • FIG. 15 an assembly procedure for the compressor assembly 10 is presented.
  • the first part 220a of the inner layer is mounted or otherwise secured to the support plate 12.
  • the compressor 10 and outlet structure 18 are mounted to the support plate 12.
  • the motor 16 is mounted to the support plate 12.
  • the gasket 219 is mounted about the outlet structure 18.
  • the first and second parts 210a, 210b are mounted to the support plate 12.
  • the second part 220b is inserted between the compressor 100 and the first and second parts 210a, 210b.
  • the third part 220c is inserted between the compressor 100 and the first and second parts 210a, 210b.
  • the compressor 100 and first and second parts 210a, 210b are mounted to the support plate 14.
  • a compressor assembly comprising:
  • a) a compressor including: [0067] i) a main housing having an inlet and an outlet;
  • Aspect 2 The compressor assembly of aspect 1 , wherein the main housing and the sound attenuating layer are separated by an interstitial gap.
  • Aspect 3 The compressor assembly of aspect 1, wherein the sound attenuating layer is a foam material.
  • Aspect 4 The compressor assembly of aspect 1 , wherein the sound attenuating layer includes a plurality of separate parts.
  • Aspect 5 The compressor assembly of aspect 1 , wherein the sound attenuation assembly includes an outer layer surrounding the sound attenuating layer.
  • Aspect 6 The compressor assembly of aspect 5, wherein the outer layer is formed from a sheet metal material.
  • Aspect 7 The compressor assembly of aspect 5, wherein the outer layer is formed from a plurality of separate parts.
  • a sound attenuation assembly for a compressor comprising:
  • an inner layer disposed within the outer layer the inner layer being formed from a sound attenuating material, the inner layer defining a perimeter wall extending between a first end wall and a second end wall, the first end wall including a first opening for surrounding a first end of the compressor such that a drive mechanism can be connected to the compressor, the second end wall including a second opening for surrounding a second end of the compressor having an air inlet opening, the perimeter wall having an opening through which an outlet of the compressor can extend.
  • Aspect 9 The sound attenuation assembly of aspect 8, wherein the sound attenuating material is a foam material.
  • Aspect 10 The sound attenuation assembly of aspect 8, wherein the inner layer includes a plurality of separate parts.
  • Aspect 11 The sound attenuation assembly of aspect 8, wherein the outer layer is formed from a different material than the sound attenuating material.
  • Aspect 12 The sound attenuation assembly of aspect 11, wherein the outer layer is formed from a sheet metal material.
  • Aspect 13 The sound attenuation assembly of aspect 8, wherein the outer layer is formed from a plurality of separate parts.
  • a compressor comprising:
  • a housing assembly having a first opening and a second opening in fluid communication with an internal cavity
  • each of the pair of seal assemblies including a first seal member and a spaced apart second seal member, wherein the housing assembly defines a passageway extending from a space defined between the first seal member and the second seal member to an exterior of the housing assembly;
  • Aspect 15 The compressor of aspect 14, wherein the second seal member has wiper seals.
  • Aspect 16 The compressor of aspect 14, wherein the compressor is a Roots-type compressor.
  • Aspect 17 The compressor of aspect 14, further including a sound attenuation assembly at least partially surrounding an outer perimeter of the housing assembly, the sound attenuation assembly including a sound attenuating layer.
  • Aspect 18 The compressor assembly of aspect 17, wherein the housing assembly and the sound attenuating layer are separated by an interstitial gap.
  • Aspect 19 The compressor assembly of aspect 17, wherein the sound attenuating layer is a foam material.
  • Aspect 20 The compressor assembly of aspect 17, wherein the sound attenuating layer includes a plurality of separate parts.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Abstract

L'invention concerne un ensemble compresseur qui peut comprendre un carter principal et un carter d'atténuation sonore entourant au moins partiellement un périmètre extérieur du carter principal. Le carter d'atténuation sonore peut comprendre une couche de matériau d'atténuation sonore. Le compresseur peut également comprendre un ensemble joint d'étanchéité présentant une paire de joints d'étanchéité sur chaque arbre rotor du compresseur, un reniflard étant prévu en communication fluidique avec un espace entre la paire de joints d'étanchéité pour empêcher la migration d'huile lubrifiante dans la voie d'écoulement d'air du compresseur.
PCT/EP2023/025261 2022-06-01 2023-06-01 Système de compresseur de type roots WO2023232292A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US202263347899P 2022-06-01 2022-06-01
US63/347899 2022-06-01

Publications (1)

Publication Number Publication Date
WO2023232292A1 true WO2023232292A1 (fr) 2023-12-07

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Family Applications (1)

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PCT/EP2023/025261 WO2023232292A1 (fr) 2022-06-01 2023-06-01 Système de compresseur de type roots

Country Status (1)

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WO (1) WO2023232292A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7488164B2 (en) 2005-05-23 2009-02-10 Eaton Corporation Optimized helix angle rotors for Roots-style supercharger
US20090142212A1 (en) * 2007-12-03 2009-06-04 Paul Xiubao Huang Rotary blower with noise abatement jacket enclosure
DE102009036363A1 (de) * 2008-08-08 2010-02-18 Yamaha Hatsudoki Kabushiki Kaisha, Iwata-shi Brennstoffzellensystem
EP2613054A1 (fr) * 2012-01-05 2013-07-10 Emerson Climate Technologies GmbH Couvercle d'atténuation du bruit
WO2013148205A1 (fr) 2012-03-29 2013-10-03 Eaton Corporation Ensemble compresseur à suralimentation électrique hybride à vitesse variable et procédé de commande d'un véhicule le comportant

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7488164B2 (en) 2005-05-23 2009-02-10 Eaton Corporation Optimized helix angle rotors for Roots-style supercharger
US20090142212A1 (en) * 2007-12-03 2009-06-04 Paul Xiubao Huang Rotary blower with noise abatement jacket enclosure
DE102009036363A1 (de) * 2008-08-08 2010-02-18 Yamaha Hatsudoki Kabushiki Kaisha, Iwata-shi Brennstoffzellensystem
EP2613054A1 (fr) * 2012-01-05 2013-07-10 Emerson Climate Technologies GmbH Couvercle d'atténuation du bruit
WO2013148205A1 (fr) 2012-03-29 2013-10-03 Eaton Corporation Ensemble compresseur à suralimentation électrique hybride à vitesse variable et procédé de commande d'un véhicule le comportant

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