EP3555483A1 - Compressor with displaceable guide device - Google Patents

Compressor with displaceable guide device

Info

Publication number
EP3555483A1
EP3555483A1 EP17826391.9A EP17826391A EP3555483A1 EP 3555483 A1 EP3555483 A1 EP 3555483A1 EP 17826391 A EP17826391 A EP 17826391A EP 3555483 A1 EP3555483 A1 EP 3555483A1
Authority
EP
European Patent Office
Prior art keywords
compressor
guide device
ring element
blades
diffuser
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Withdrawn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
EP17826391.9A
Other languages
German (de)
French (fr)
Inventor
Aleksandar Sekularac
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.)
BorgWarner Inc
Original Assignee
BorgWarner Inc
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 BorgWarner Inc filed Critical BorgWarner Inc
Publication of EP3555483A1 publication Critical patent/EP3555483A1/en
Withdrawn legal-status Critical Current

Links

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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/46—Fluid-guiding means, e.g. diffusers adjustable
    • F04D29/462—Fluid-guiding means, e.g. diffusers adjustable 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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/46—Fluid-guiding means, e.g. diffusers adjustable
    • F04D29/462—Fluid-guiding means, e.g. diffusers adjustable especially adapted for elastic fluid pumps
    • F04D29/464—Fluid-guiding means, e.g. diffusers adjustable especially adapted for elastic fluid pumps adjusting flow cross-section, otherwise than by using adjustable stator blades
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2250/00—Geometry
    • F05D2250/50—Inlet or outlet
    • F05D2250/52—Outlet

Definitions

  • the present invention relates to a compressor with a displaceable guide device and a charging device with a corresponding compressor.
  • Exhaust gas turbochargers are known, for example, in which a turbine with a turbine wheel is driven by the exhaust gas flow of the internal combustion engine.
  • a compressor wheel which is arranged with a turbine wheel on a mutual shaft, compresses the fresh air taken in for the engine.
  • the air or oxygen amount, available to the engine for combustion is increased, which in turn leads to an increased output of the internal combustion engine.
  • Compressors may also be decoupled from exhaust gas turbochargers, for example, in mechanically or electrically driven compressors, or, for example, in combination with an air supply for a fuel cell engine.
  • Known compressors comprise a compressor housing in which a compressor wheel is arranged. The fresh air is sucked in through a compressor inlet, accelerated by the compressor wheel, and leaves the compressor via a spiral after it has passed through the diffuser.
  • guide blades are arranged in the area of the diffuser. In known compressors with guide blades, these are rigidly installed in the diffuser or are pushed through individual slots in the diffuser wall. In the systems with slots, a very precise processing of the diffuser wall and the slots provided therein is necessary for the blades. This is very laborious. In addition, it is very difficult to keep the slots for the guide blades or the gaps between the slots and the guide blades free of contaminants and to seal them.
  • the object of the present invention is accordingly to provide a compressor that has an easily assembled yet still variable guide device.
  • the present invention relates to a compressor for a charging device according to Claim 1 and a charging device according to Claim 15.
  • the compressor according to the invention comprises a compressor housing, a compressor backplate, and a compressor wheel which is arranged in the compressor housing, wherein a diffuser is formed radially outside of the compressor wheel between the compressor housing and the compressor backplate.
  • An axially displaceable guide device is arranged in the area of the diffuser, wherein the guide device comprises a first ring element, a second ring element, and at least one blade that is arranged between the first ring element and the second ring element.
  • the invention provides a simpler manufacturing and assembly process as the guide device may be completely preassembled and the corresponding elements of the guide device (first and second ring elements and blades) are easy to process and thus lower tolerances may be maintained.
  • the gaps between the blades and the diffuser wall e.g. the compressor backplate
  • the through openings which are laborious to manufacture and into which the blades are guided in the diffuser wall, are omitted in the compressor according to the invention.
  • the compressor according to the invention provides improvements in the area of pressure ratios and efficiency (in particular in the transient range and in the range of maximum torque), and also an increase in operational stability and the surge limit (the area on the left of the compressor characteristic map).
  • the compressors according to the invention have a greater operating range, as the advantages of the displaceable guide device in the left area of the compressor characteristic map do not cause any negative effects in the lower right area of the compressor characteristic map (the area of the stop line) - in contrast to rigidly installed or pivotable blades.
  • the width of the diffuser varies over a corresponding configuration of the ring elements and may be adjusted according to use. Due to the configuration of the guide device, in particular the shape/cross-sectional contour and thickness of the ring elements, the ratio of blade discharge width to diffuser intake width may be determined.
  • the guide device may be configured, for example, so that the width of the diffuser at the extended guide device is smaller than at the retracted guide device. This means that dynamic blades may not only be positioned in the diffuser or removed from the diffuser, but also that the width of the diffuser may be varied during operation of the compressor. A change from a larger to a smaller width of the diffuser is advantageous, in particular for operating points near the surge limit.
  • the guide device may be quickly extended and retracted again.
  • a recess may be formed in the compressor backplate and/or in the compressor housing in the area of the guide device.
  • the recess may be configured in such a way that the guide device may be displaced from an extended position, in which flow passes by the blades during operation, into a retracted position, in which the guide device is located in the recess and flow does not pass by the blades.
  • opposing radial lateral surfaces of the first ring element and the second ring element, between which the blades are arranged form the diffuser.
  • the diffuser In the retracted position of the guide device, the diffuser may be formed by a lateral surface of the first ring element, which faces in the direction of the compressor housing, and the compressor housing.
  • the diffuser in the retracted position of the guide device, may be formed by a lateral surface of the second ring element, which faces in the direction of the compressor backplate, and the compressor backplate.
  • a second recess may be provided, which is configured to accommodate only the first or only the second ring element.
  • the first ring element and/or the second ring element have a U- shaped cross section with first and second arms.
  • the recess may have grooves which are designed to guide and to at least partially accommodate the arms during displacement of the guide device.
  • the cross-sectional shape of the first and/or second ring element is advantageously configured for the kinematics and the sealing of the diffuser with respect to the accommodation space (for the guide device in the recess): as the first and/or second ring element is configured with a U-shaped cross section, then a good processing of the outer surface of the ring element (or ring elements) is facilitated so that a good seal is provided in the interaction with the compressor housing or the compressor backplate.
  • the arms of the U-profile stabilize and guide the guide device during the translational movement.
  • a T- shaped cross section may also be used, which is guided in a recess.
  • a lateral surface of the first and/or second ring element facing in the direction of the compressor backplate may be configured as flattened on its radially inner end so that a uniform transition between a surface of the compressor housing or the compressor backplate and the guide device is formed in an extended position of the guide device.
  • the blades may be fixedly connected to the first and second ring elements.
  • the first ring element and the second ring element may be arranged concentrically with respect to an axis of rotation of the compressor.
  • a third ring element may be provided, wherein the at least one blade contains a plurality of first blades between the first ring element and the second ring element, and a plurality of second blades is arranged between the second ring element and the third ring element.
  • the first blades and the second blades may differ in their shape, size, number, position, and/or arrangement. Due to the multilayer guide device, different types and a different numbers of blades may be provided in the diffuser area for different operating points (in the compressor characteristic map) and also different positions and arrangements of the blades may be provided. This facilitates a more precise adaptation of the compressor characteristic map to the desired demands and to the size of the turbocharger.
  • the blades may be arranged in a single row and optionally distributed uniformly in the circumferential direction.
  • the blades may be arranged in two or more rows and optionally distributed uniformly in the circumferential direction.
  • an actuating device may additionally be provided which is designed to displace the guide device between the retracted position and the extended position.
  • the actuating device may comprise an electromechanical device, a pneumatic device, or a hydraulic device. Alternatively or additionally, the actuating device may comprise a magnet.
  • the actuating device and/or the guide device may additionally comprise biasing means.
  • the compressor backplate may be a separate component or a part of a bearing housing.
  • the axially displaceable guide device may be a first axially displaceable guide device, and a second axially displaceable guide device may be additionally provided, which is arranged radially within or radially outside of the first axially displaceable guide device.
  • the second axially displaceable guide device may have features corresponding to the first axially displaceable guide device according to any of the previously described configurations.
  • the invention additionally comprises a charging device with a compressor according to any one of the previously described configurations.
  • Figure 1 shows a partial section of an embodiment of the compressor according to the invention with a guide device in an extended position
  • Figure 2 shows a partial section of the embodiment of the compressor according to the invention from Figure 1 with a guide device in a retracted position;
  • Figure 3 shows compressor characteristic maps from compressors without blades or with stationary blades respectively.
  • radial surfaces/planes refer to surfaces that are arranged in the planes that are perpendicular to the axis of rotation 500 of the compressor 10.
  • FIG. 1 and Figure 2 show a partial section of the upper half of an embodiment of compressor 10 according to the invention.
  • the compressor comprises a compressor housing 100, a compressor backplate 200, and a compressor wheel 400 which is arranged in compressor housing 100.
  • a diffuser 120 is formed radially outside of compressor wheel 400 and between compressor housing 100 and compressor backplate 200.
  • An axially displaceable guide device 300 is arranged in the area of diffuser 120.
  • Guide device 300 has a first ring element 310, a second ring element 330, and at least one blade 320.
  • blade comprises herein all types of connection elements that may connect the first and second ring element to one another.
  • simple connection bolts are included within the scope of this application along with (fluid mechanically) specially shaped guide blades.
  • Blades 320 (in the remainder of the application, the term “blades” is used, which continues to be synonymous with at least one blade) are arranged between first ring element 310 and second ring element 330.
  • blades 320 are rigidly connected to first and second ring elements 310, 330.
  • First ring element 310 and second ring element 330 are arranged concentrically with respect to axis of rotation 500 of compressor 10.
  • the invention provides a simpler manufacturing and assembly process as guide device 300 may be completely preassembled and the corresponding elements of the guide device (first and second ring elements 310, 330 and also blades 320) are easy to process and thus lower tolerances may be maintained.
  • the gaps between the blades and the diffuser wall e.g. the compressor backplate
  • the through openings which are complex to manufacture and into which the blades are guided in the diffuser wall, are omitted in compressor 10 according to the invention.
  • compressor 10 according to the invention provides improvements in the area of pressure ratios and efficiency (in particular in the transient range and in the range of maximum torque), and an increase in operational stability and the surge limit (the area on the left of the compressor characteristic map).
  • compressor 10 according to the invention has a greater operating range, as the advantages of displaceable guide device 300 in the left area of the compressor characteristic map do not cause any negative effects in the lower right area of the compressor characteristic map (the area of the stop line) - in contrast to rigidly installed or pivotable blades.
  • the areas of the two characteristic maps 600, 700 shown in Figure 3 may thus be exploited.
  • the width of diffuser 120 varies over a corresponding configuration of ring elements 310, 330 and may be adjusted according to use. Due to the configuration of guide device 300, in particular the shape/cross-sectional contour and thickness of ring elements 310, 330, the ratio of blade discharge width to diffuser intake width may be determined. For example, as is clear in the comparison of the depictions of the embodiment in Figure 1 and Figure 2, guide device 300 may be configured so that the width of diffuser 120 is smaller when guide device 300 is extended than when guide device 300 is retracted.
  • dynamic blades 320 may not only be positioned in diffuser 120 or removed from diffuser 120, but also that the width of diffuser 120 may be varied during operation of compressor 10. A change from a larger to a smaller width of diffuser 120 is advantageous in particular for operating points near the surge limit.
  • guide device 300 is simply structured. Due to this simple structure and the simple displacement kinematics, guide device 300 may be quickly extended and retracted again.
  • recess 210 is arranged in compressor backplate 200.
  • guide device 300 may also be arranged as mirror inverted, so that the recess would be formed in compressor housing 100 in the area of guide device 300.
  • Recess 210 may be configured in such a way that guide device 300 may be displaced from an extended position (see Figure 1), in which flow passes through blades 320 during operation, into a retracted position (see Figure 2), in which guide device 300 is located in recess 210 and flow does not pass by blades 320.
  • Guide device 300 is thereby either completely extended in the extended position or completely retracted in the retracted position.
  • diffuser 120 may be formed in the retracted position of guide device 300 by a radial lateral surface of second ring element 330, which faces in the direction of compressor backplate 200, and a radial lateral surface of compressor backplate 200.
  • a radial lateral surface of second ring element 330 which faces in the direction of compressor backplate 200
  • a radial lateral surface of compressor backplate 200 may be formed in the retracted position of guide device 300 by a radial lateral surface of second ring element 330, which faces in the direction of compressor backplate 200, and a radial lateral surface of compressor backplate 200.
  • a recess 210 is provided in compressor backplate 200 which is configured for accommodating the complete guide device 300 (as is depicted in Figure 1 and Figure 2), and additionally, depending on need, a second recess is provided on the opposite side in compressor housing 100 which may accommodate at least a part of first ring element 310 in order to thus be able to determine the width of diffuser 120 and the corresponding flow volume through diffuser 120 when guide device 300 is extended.
  • No recess is provided on compressor housing 100 in the example shown in Figure 1 and Figure 2, by which means it is possible to reduce the diffuser width with the aid of first ring element 310 and, depending on the width of first ring element 310, in comparison to a state in which guide device 300 is in a retracted position.
  • the arrangement may also be arranged and actuatable in reverse (mirror inverted). Then a larger recess would be in compressor housing 100 and no recess or a smaller second recess would be in compressor backplate 200.
  • first ring element 310 is formed in the shape of a plate and second ring element 330 has a U-shaped cross section which has first and second arms 332, 334.
  • Recess 210 has grooves which are designed to guide and to at least partially accommodate arms 332, 334 during displacement of guide device 300.
  • the configuration of the cross-sectional shape of ring element 330 is advantageously configured for the kinematics and the sealing of diffuser 120 with respect to the accommodation space (which is designed for guide device 300 in recess 210): as ring element 330 is configured with a U-shaped cross section, then a good processing of the outer surface of ring element 330 is facilitated so that a good seal is provided in the interaction with compressor backplate 200.
  • arms 332, 334 of the U-shaped profile stabilize and guide device 300 during the translational movement. A much simpler kinematics results therefrom in comparison to compressors with displaceable guide blades.
  • a T-shaped cross section may also be used for the first ring element (or for the second ring element in the mirror-inverted arrangement). Only a (central) groove is correspondingly provided, in which the ring element and by this means the entire guide device 300 is guided.
  • first ring element 310 also conceivable for second ring element 310 which faces in the direction of compressor backplate 200 and is designed as flattened on its radially inward end so that a uniform transition is formed between a surface of compressor housing 100 or of compressor backplate 200 and guide device 300 in an extended position of guide device 300 (see Figure 1).
  • a third ring element may be additionally provided, wherein the blades between the first ring element and the second ring element contain first blades, and a plurality of second blades is arranged between the second ring element and the third ring element.
  • the first blades and the second blades may differ in their shape, size, number, position, and/or arrangement. If such a multilayer guide device is provided, then the displacement may also be facilitated in that a deeper recess is provided in compressor backplate 200 or in compressor housing 100 so that the multilayer guide device may be completely retracted from the diffuser area, for example, in two stages.
  • a diffuser 120 with a first blading and with a second blading, and also a diffuser 120 without blades may be provided.
  • a recess may be conceived of both in compressor housing 100 and also in compressor backplate 200, wherein a first blading or a second blading may also be arranged in diffuser 120, said bladings are correspondingly provided between the first and the second ring elements or between the second and the third ring elements.
  • the number of layers may theoretically be increased via corresponding additional ring elements and by blades arranged between the ring elements.
  • Blades 320 of guide device 300 may be arranged in a single row between first and second ring elements 310, 330 (between the second and third ring elements in the face multiple layers are provided) and distributed uniformly in the circumferential direction.
  • blades 320 may be provided in two or more rows.
  • an actuating device (not shown in the figures) is additionally provided which is designed to displace guide device 300 between the retraced position and the extended position.
  • the actuating device may comprise an electromechanical device, a pneumatic device, or a hydraulic device. Alternatively or additionally, the actuating device may comprise a magnet.
  • the actuating device and/or guide device 300 may additionally comprise biasing means which bias guide device 300 either in the direction of the extended position or in the direction of the retracted position.
  • Compressor backplate 200 is shown as a separate component in Figures 1 and 2.
  • the compressor backplate may also be part of a bearing housing contacting the compressor.
  • axially displaceable guide device 300 may be a first axially displaceable guide device, and a second axially displaceable guide device may be additionally provided, which is arranged radially within or radially outside of the first axially displaceable guide device.
  • the second axially displaceable guide device may have corresponding features which have been described previously in conjunction with first axially displaceable guide device 300.
  • additional (third, fourth, etc.) axially displaceable guide devices may be provided.
  • the actuation of the second and/or additional guide devices may be carried out via a common actuator system or via an individual actuation and regulation device.
  • different types and different numbers of blades may be arranged in the diffuser area and also different positions and arrangements of the blades may be provided for multiple, independently operable guide devices for different operating points (in the compressor characteristic map). This facilitates in turn a more precise adaptation of the compressor characteristic map to the desired demands and to the size of the turbocharger.
  • the position of the guide device(s) is controlled depending on the currently required demands at compressor 10, e.g., by a control device and via a corresponding regulating mechanism.
  • different regulating parameters may be used, for example, at least partially the engine speed, the engine torque, the gas pedal position, pressure ratios in the compressor or engine, temperatures in the area of the engine and in the area of the compressor, etc.
  • a compressor (10) for a charging device comprising
  • a compressor wheel (400) which is arranged in the compressor housing (100),
  • a diffuser (120) is formed radially outside of the compressor wheel (400) and between the compressor housing (100) and the compressor backplate (200),
  • a guide device (300) which is arranged and axially displaceable in the area of the diffuser (120), wherein the guide device (300) comprises a first ring element (310), a second ring element (330), and at least one blade (320) that is arranged between the first ring element (310) and the second ring element (330).
  • the compressor according to Embodiment 1 characterized in that a recess (210) is formed in the compressor backplate (200) and/or in the compressor housing (100) in the area of the guide device (300).
  • the compressor according to Embodiment 2 characterized in that the recess (210) is configured in such a way that the guide device (300) may be displaced from an extended position, in which flow passes through the blades (320) during operation, into a retracted position, in which the guide device (300) is located in the recess (210) and flow does not pass by the blades (320).
  • the compressor according to Embodiment 2 or Embodiment 3 characterized in that a second recess is additionally provided which is configured for accommodating only the first or only the second ring element (310, 330).
  • the compressor according to Embodiment 3 or Embodiment 4 characterized in that opposing radial lateral surfaces of the first ring element (310) and the second ring element (330), between which the blades (320) are arranged, form the diffuser (120) in the extended position of the guide device (300).
  • the diffuser (120) is formed by a lateral surface of the second ring element (330), which faces in the direction of the compressor backplate (200), and the compressor backplate (200) in the retracted position of the guide device (300).
  • first ring element (310) and/or the second ring element (330) has a U-shaped cross section with first and second arms (332, 334).
  • a lateral surface of the first and/or second ring element (310, 330) facing in the direction of the compressor backplate (200) is configured as flattened on its radially inner end so that a uniform transition between a surface of the compressor housing (100) or the compressor backplate (200) and the guide device (300) is formed in an extended position of the guide device (300).
  • the compressor according to any one of the preceding embodiments, characterized in that the blades (320) are fixedly connected to the first and second ring elements (310, 330).
  • the compressor according to any one of the preceding embodiments characterized in that the first ring element (310) and the second ring element (330) are arranged concentrically with respect to an axis of rotation (500) of the compressor (10).
  • a third ring element is provided, wherein the at least one blade between the first ring element and the second ring element contains a plurality of first blades, and a plurality of second blades is arranged between the second ring element and the third ring element.
  • the compressor according to Embodiment 12 characterized in that the first blades and the second blades differ in their shape, size, number, position, and/or arrangement.
  • the compressor according to any one of the preceding embodiments characterized in that the blades (320) are arranged in a single row and optionally distributed uniformly in the circumferential direction.
  • the compressor according to any one of the preceding embodiments characterized in that an actuating device is additionally provided which is designed to displace the guide device (300) between the retracted position and the extended position.
  • the compressor according to Embodiment 16 characterized in that the actuating device comprises an electromechanical device, a pneumatic device, or a hydraulic device.
  • the compressor according to Embodiment 16 characterized in that the actuating device comprises a magnet.
  • compressor backplate (200) is a separate component, or characterized in that the compressor backplate (200) is part of a bearing housing.
  • the axially displaceable guide device (300) is a first axially displaceable guide device, and that a second axially displaceable guide device is provided which is arranged radially within or radially outside of the first axially displaceable guide device, and wherein the second axially displaceable guide device may have features corresponding to the first axially displaceable guide device (300) according to any one of the preceding embodiments.
  • a charging device for an engine with a compressor according to any one of the preceding embodiments.

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

Abstract

The invention relates to a compressor comprising a compressor housing, a compressor backplate, and a compressor wheel which is arranged in the compressor housing, wherein a diffuser is formed radially outside of the compressor wheel between the compressor housing and the compressor backplate. An axially displaceable guide device is arranged in the area of the diffuser, wherein the guide device comprises a first ring element, a second ring element, and at least one blade that is arranged between the first ring element and the second ring element.

Description

COMPRESSOR WITH DISPLACEABLE GUIDE DEVICE
Field of the Invention
[0001] The present invention relates to a compressor with a displaceable guide device and a charging device with a corresponding compressor.
Background Information
[0002] Increasingly more vehicles of the more recent generation are equipped with charging devices. In order to achieve the target demands and the legal requirements, it is imperative to promote development in the complete drive train and also to optimize the individual components as well as the system as a whole with respect to their reliability and efficiency.
[0003] Exhaust gas turbochargers are known, for example, in which a turbine with a turbine wheel is driven by the exhaust gas flow of the internal combustion engine. A compressor wheel, which is arranged with a turbine wheel on a mutual shaft, compresses the fresh air taken in for the engine. By this means, the air or oxygen amount, available to the engine for combustion, is increased, which in turn leads to an increased output of the internal combustion engine.
[0004] Compressors may also be decoupled from exhaust gas turbochargers, for example, in mechanically or electrically driven compressors, or, for example, in combination with an air supply for a fuel cell engine.
[0005] Known compressors comprise a compressor housing in which a compressor wheel is arranged. The fresh air is sucked in through a compressor inlet, accelerated by the compressor wheel, and leaves the compressor via a spiral after it has passed through the diffuser. It may be provided that guide blades are arranged in the area of the diffuser. In known compressors with guide blades, these are rigidly installed in the diffuser or are pushed through individual slots in the diffuser wall. In the systems with slots, a very precise processing of the diffuser wall and the slots provided therein is necessary for the blades. This is very laborious. In addition, it is very difficult to keep the slots for the guide blades or the gaps between the slots and the guide blades free of contaminants and to seal them. In addition, there are also compressors with rotatable blades. These have the disadvantage that the kinematics, and thus the mechanics for the displacement of the blades is complex, and thus is prone to errors, and the blades may not be removed from the diffuser.
[0006] The object of the present invention is accordingly to provide a compressor that has an easily assembled yet still variable guide device.
Brief Summary of the Invention
[0007] The present invention relates to a compressor for a charging device according to Claim 1 and a charging device according to Claim 15.
[0008] The compressor according to the invention comprises a compressor housing, a compressor backplate, and a compressor wheel which is arranged in the compressor housing, wherein a diffuser is formed radially outside of the compressor wheel between the compressor housing and the compressor backplate. An axially displaceable guide device is arranged in the area of the diffuser, wherein the guide device comprises a first ring element, a second ring element, and at least one blade that is arranged between the first ring element and the second ring element.
[0009] In comparison to the prior art, the invention provides a simpler manufacturing and assembly process as the guide device may be completely preassembled and the corresponding elements of the guide device (first and second ring elements and blades) are easy to process and thus lower tolerances may be maintained. In addition, the gaps between the blades and the diffuser wall (e.g. the compressor backplate), which are present in previously known arrangements with movable blades and are difficult to seal, and also the through openings, which are laborious to manufacture and into which the blades are guided in the diffuser wall, are omitted in the compressor according to the invention.
[0010] With respect to compressors without blades or with rigidly installed blades, the compressor according to the invention provides improvements in the area of pressure ratios and efficiency (in particular in the transient range and in the range of maximum torque), and also an increase in operational stability and the surge limit (the area on the left of the compressor characteristic map). By this means, the compressors according to the invention have a greater operating range, as the advantages of the displaceable guide device in the left area of the compressor characteristic map do not cause any negative effects in the lower right area of the compressor characteristic map (the area of the stop line) - in contrast to rigidly installed or pivotable blades. [0011] It is additionally advantageous in the embodiment of the guide device with two ring elements and blades arranged therebetween that the width of the diffuser varies over a corresponding configuration of the ring elements and may be adjusted according to use. Due to the configuration of the guide device, in particular the shape/cross-sectional contour and thickness of the ring elements, the ratio of blade discharge width to diffuser intake width may be determined. In particular, the guide device may be configured, for example, so that the width of the diffuser at the extended guide device is smaller than at the retracted guide device. This means that dynamic blades may not only be positioned in the diffuser or removed from the diffuser, but also that the width of the diffuser may be varied during operation of the compressor. A change from a larger to a smaller width of the diffuser is advantageous, in particular for operating points near the surge limit.
[0012] Due to the simple structure of the guide device and the simple displacement kinematics, the guide device may be quickly extended and retracted again.
[0013] In configurations, a recess may be formed in the compressor backplate and/or in the compressor housing in the area of the guide device. The recess may be configured in such a way that the guide device may be displaced from an extended position, in which flow passes by the blades during operation, into a retracted position, in which the guide device is located in the recess and flow does not pass by the blades. In the extended position of the guide device, opposing radial lateral surfaces of the first ring element and the second ring element, between which the blades are arranged, form the diffuser. In the retracted position of the guide device, the diffuser may be formed by a lateral surface of the first ring element, which faces in the direction of the compressor housing, and the compressor housing. Alternatively, in the retracted position of the guide device, the diffuser may be formed by a lateral surface of the second ring element, which faces in the direction of the compressor backplate, and the compressor backplate. In addition, a second recess may be provided, which is configured to accommodate only the first or only the second ring element. [0014] In configurations, which are combinable with all previously described configurations, the first ring element and/or the second ring element have a U- shaped cross section with first and second arms. The recess may have grooves which are designed to guide and to at least partially accommodate the arms during displacement of the guide device. The cross-sectional shape of the first and/or second ring element is advantageously configured for the kinematics and the sealing of the diffuser with respect to the accommodation space (for the guide device in the recess): as the first and/or second ring element is configured with a U-shaped cross section, then a good processing of the outer surface of the ring element (or ring elements) is facilitated so that a good seal is provided in the interaction with the compressor housing or the compressor backplate. In addition, the arms of the U-profile stabilize and guide the guide device during the translational movement. A much simpler kinematics results therefrom in comparison to compressors with displaceable guide blades. Alternatively, a T- shaped cross section may also be used, which is guided in a recess.
[0015] In configurations, which are combinable with all previously described configurations, a lateral surface of the first and/or second ring element facing in the direction of the compressor backplate may be configured as flattened on its radially inner end so that a uniform transition between a surface of the compressor housing or the compressor backplate and the guide device is formed in an extended position of the guide device. [0016] In configurations, which are combinable with all previously described configurations, the blades may be fixedly connected to the first and second ring elements.
[0017] In configurations, which are combinable with all previously described configurations, the first ring element and the second ring element may be arranged concentrically with respect to an axis of rotation of the compressor.
[0018] In configurations, which are combinable with all previously described configurations, a third ring element may be provided, wherein the at least one blade contains a plurality of first blades between the first ring element and the second ring element, and a plurality of second blades is arranged between the second ring element and the third ring element. The first blades and the second blades may differ in their shape, size, number, position, and/or arrangement. Due to the multilayer guide device, different types and a different numbers of blades may be provided in the diffuser area for different operating points (in the compressor characteristic map) and also different positions and arrangements of the blades may be provided. This facilitates a more precise adaptation of the compressor characteristic map to the desired demands and to the size of the turbocharger.
[0019] In embodiments, which may be combined with all previously described embodiments, the blades may be arranged in a single row and optionally distributed uniformly in the circumferential direction. Alternatively, the blades may be arranged in two or more rows and optionally distributed uniformly in the circumferential direction.
[0020] In configurations, which are combinable with all previously described configurations, an actuating device may additionally be provided which is designed to displace the guide device between the retracted position and the extended position. The actuating device may comprise an electromechanical device, a pneumatic device, or a hydraulic device. Alternatively or additionally, the actuating device may comprise a magnet. The actuating device and/or the guide device may additionally comprise biasing means.
[0021] In configurations, which are combinable with all previously described configurations, the compressor backplate may be a separate component or a part of a bearing housing.
[0022] In configurations, which are combinable with all previously described configurations, the axially displaceable guide device may be a first axially displaceable guide device, and a second axially displaceable guide device may be additionally provided, which is arranged radially within or radially outside of the first axially displaceable guide device. The second axially displaceable guide device may have features corresponding to the first axially displaceable guide device according to any of the previously described configurations.
[0023] The invention additionally comprises a charging device with a compressor according to any one of the previously described configurations.
[0024] Additional details and features of the invention are subsequently described by way of the figures. Brief Description of the Drawings
Figure 1 shows a partial section of an embodiment of the compressor according to the invention with a guide device in an extended position;
Figure 2 shows a partial section of the embodiment of the compressor according to the invention from Figure 1 with a guide device in a retracted position; Figure 3 shows compressor characteristic maps from compressors without blades or with stationary blades respectively. Detailed Description of the Invention
[0025] Embodiments of the compressor according to the invention will subsequently be described based on the figures. All details and advantages subsequently described apply both to the compressor and also to a charging device with a corresponding compressor. In the scope of this application, radial surfaces/planes refer to surfaces that are arranged in the planes that are perpendicular to the axis of rotation 500 of the compressor 10.
[0026] Figure 1 and Figure 2 show a partial section of the upper half of an embodiment of compressor 10 according to the invention. The compressor comprises a compressor housing 100, a compressor backplate 200, and a compressor wheel 400 which is arranged in compressor housing 100. A diffuser 120 is formed radially outside of compressor wheel 400 and between compressor housing 100 and compressor backplate 200. During operation of the compressor, fresh air is sucked in via the compressor inlet 110, accelerated by compressor wheel 400, and discharged via spiral 130 after it has passed through diffuser 120. An axially displaceable guide device 300 is arranged in the area of diffuser 120. Guide device 300 has a first ring element 310, a second ring element 330, and at least one blade 320. The term blade comprises herein all types of connection elements that may connect the first and second ring element to one another. Thus, simple connection bolts are included within the scope of this application along with (fluid mechanically) specially shaped guide blades. Blades 320 (in the remainder of the application, the term "blades" is used, which continues to be synonymous with at least one blade) are arranged between first ring element 310 and second ring element 330. In particular, blades 320 are rigidly connected to first and second ring elements 310, 330. First ring element 310 and second ring element 330 are arranged concentrically with respect to axis of rotation 500 of compressor 10. [0027] In comparison to the prior art, the invention provides a simpler manufacturing and assembly process as guide device 300 may be completely preassembled and the corresponding elements of the guide device (first and second ring elements 310, 330 and also blades 320) are easy to process and thus lower tolerances may be maintained. In addition, the gaps between the blades and the diffuser wall (e.g. the compressor backplate), which are present in previously known arrangements with movable blades and are difficult to seal, and also the through openings, which are complex to manufacture and into which the blades are guided in the diffuser wall, are omitted in compressor 10 according to the invention.
[0028] With respect to compressors without blades (see compressor characteristic map 700 in Figure 3) or with rigidly installed blades see compressor characteristic map 600 in Figure 3), compressor 10 according to the invention provides improvements in the area of pressure ratios and efficiency (in particular in the transient range and in the range of maximum torque), and an increase in operational stability and the surge limit (the area on the left of the compressor characteristic map). By this means, compressor 10 according to the invention has a greater operating range, as the advantages of displaceable guide device 300 in the left area of the compressor characteristic map do not cause any negative effects in the lower right area of the compressor characteristic map (the area of the stop line) - in contrast to rigidly installed or pivotable blades. By using a displaceable guide device 300, the areas of the two characteristic maps 600, 700 shown in Figure 3 may thus be exploited.
[0029] It is additionally advantageous in the embodiment of the guide device with two ring elements 310, 330 and blades 320 arranged therebetween that the width of diffuser 120 varies over a corresponding configuration of ring elements 310, 330 and may be adjusted according to use. Due to the configuration of guide device 300, in particular the shape/cross-sectional contour and thickness of ring elements 310, 330, the ratio of blade discharge width to diffuser intake width may be determined. For example, as is clear in the comparison of the depictions of the embodiment in Figure 1 and Figure 2, guide device 300 may be configured so that the width of diffuser 120 is smaller when guide device 300 is extended than when guide device 300 is retracted. This means that dynamic blades 320 may not only be positioned in diffuser 120 or removed from diffuser 120, but also that the width of diffuser 120 may be varied during operation of compressor 10. A change from a larger to a smaller width of diffuser 120 is advantageous in particular for operating points near the surge limit.
[0030] As is likewise clear in Figures 1 and 2, guide device 300 is simply structured. Due to this simple structure and the simple displacement kinematics, guide device 300 may be quickly extended and retracted again.
[0031] It is clear in Figure 1 that recess 210 is arranged in compressor backplate 200. Alternatively, guide device 300 may also be arranged as mirror inverted, so that the recess would be formed in compressor housing 100 in the area of guide device 300. Recess 210 may be configured in such a way that guide device 300 may be displaced from an extended position (see Figure 1), in which flow passes through blades 320 during operation, into a retracted position (see Figure 2), in which guide device 300 is located in recess 210 and flow does not pass by blades 320. Guide device 300 is thereby either completely extended in the extended position or completely retracted in the retracted position.
[0032] It is clear in Figure 1, that in the extended position of guide device 300, opposing radial lateral surfaces of first ring element 310 and second ring element 330, between which blades 320 are arranged, form diffuser 120. In contrast, in the retracted position of guide device 300 (see Figure 2), diffuser 120 is formed by a lateral surface of first ring element 310, which faces in the direction of compressor housing 100, and a radial lateral surface of compressor housing 100. In the alternative, mirror-inverted arrangement or movement direction of guide device 300, diffuser 120 may be formed in the retracted position of guide device 300 by a radial lateral surface of second ring element 330, which faces in the direction of compressor backplate 200, and a radial lateral surface of compressor backplate 200. [0033] Depending on the compressor (size) and configuration of blades 310, it may be logical to provide recesses in both lateral walls of diffuser 120 if a specific cross sectional surface is to be realized for a corresponding operating point. I.e., that, for example, a recess 210 is provided in compressor backplate 200 which is configured for accommodating the complete guide device 300 (as is depicted in Figure 1 and Figure 2), and additionally, depending on need, a second recess is provided on the opposite side in compressor housing 100 which may accommodate at least a part of first ring element 310 in order to thus be able to determine the width of diffuser 120 and the corresponding flow volume through diffuser 120 when guide device 300 is extended. No recess is provided on compressor housing 100 in the example shown in Figure 1 and Figure 2, by which means it is possible to reduce the diffuser width with the aid of first ring element 310 and, depending on the width of first ring element 310, in comparison to a state in which guide device 300 is in a retracted position. Alternatively, the arrangement may also be arranged and actuatable in reverse (mirror inverted). Then a larger recess would be in compressor housing 100 and no recess or a smaller second recess would be in compressor backplate 200. [0034] The features of guide device 300 and of compressor housing 100 or compressor backplate 200, subsequently described with the aid of Figures 1 and 2, may be provided in a mirror-inverted arrangement and the actuation of guide device 300 may be correspondingly mirror inverted. Figure 1 and Figure 2 show that first ring element 310 is formed in the shape of a plate and second ring element 330 has a U-shaped cross section which has first and second arms 332, 334. Recess 210 has grooves which are designed to guide and to at least partially accommodate arms 332, 334 during displacement of guide device 300. The configuration of the cross-sectional shape of ring element 330 is advantageously configured for the kinematics and the sealing of diffuser 120 with respect to the accommodation space (which is designed for guide device 300 in recess 210): as ring element 330 is configured with a U-shaped cross section, then a good processing of the outer surface of ring element 330 is facilitated so that a good seal is provided in the interaction with compressor backplate 200. In addition, arms 332, 334 of the U-shaped profile stabilize and guide device 300 during the translational movement. A much simpler kinematics results therefrom in comparison to compressors with displaceable guide blades. [0035] Alternatively to the U-shaped cross section, a T-shaped cross section may also be used for the first ring element (or for the second ring element in the mirror-inverted arrangement). Only a (central) groove is correspondingly provided, in which the ring element and by this means the entire guide device 300 is guided.
[0036] As is clear in Figure 1 and Figure 2, a lateral surface of first ring element 310 (also conceivable for second ring element 310) which faces in the direction of compressor backplate 200 and is designed as flattened on its radially inward end so that a uniform transition is formed between a surface of compressor housing 100 or of compressor backplate 200 and guide device 300 in an extended position of guide device 300 (see Figure 1).
[0037] In one configuration, which is not depicted in the figures, a third ring element may be additionally provided, wherein the blades between the first ring element and the second ring element contain first blades, and a plurality of second blades is arranged between the second ring element and the third ring element. The first blades and the second blades may differ in their shape, size, number, position, and/or arrangement. If such a multilayer guide device is provided, then the displacement may also be facilitated in that a deeper recess is provided in compressor backplate 200 or in compressor housing 100 so that the multilayer guide device may be completely retracted from the diffuser area, for example, in two stages. By this means, a diffuser 120 with a first blading and with a second blading, and also a diffuser 120 without blades may be provided. Alternatively, a recess may be conceived of both in compressor housing 100 and also in compressor backplate 200, wherein a first blading or a second blading may also be arranged in diffuser 120, said bladings are correspondingly provided between the first and the second ring elements or between the second and the third ring elements. The number of layers may theoretically be increased via corresponding additional ring elements and by blades arranged between the ring elements.
[0038] Due to a multilayer guide device, different types and different numbers of blades may be arranged in the diffuser area for different operating points (in the compressor characteristic map) and also different positions and arrangements of the blades may be provided. This facilitates a more precise adaptation of the compressor characteristic map to the desired demands and to the size of the turbocharger.
[0039] Blades 320 of guide device 300 may be arranged in a single row between first and second ring elements 310, 330 (between the second and third ring elements in the face multiple layers are provided) and distributed uniformly in the circumferential direction. Alternatively, blades 320 may be provided in two or more rows.
[0040] To actuate guide device 300, an actuating device (not shown in the figures) is additionally provided which is designed to displace guide device 300 between the retraced position and the extended position. The actuating device may comprise an electromechanical device, a pneumatic device, or a hydraulic device. Alternatively or additionally, the actuating device may comprise a magnet. The actuating device and/or guide device 300 may additionally comprise biasing means which bias guide device 300 either in the direction of the extended position or in the direction of the retracted position.
[0041] Compressor backplate 200 is shown as a separate component in Figures 1 and 2. Alternatively, the compressor backplate may also be part of a bearing housing contacting the compressor. [0042] In another configuration of the compressor according to the invention, which is likewise not shown in the figures, axially displaceable guide device 300 may be a first axially displaceable guide device, and a second axially displaceable guide device may be additionally provided, which is arranged radially within or radially outside of the first axially displaceable guide device. The second axially displaceable guide device may have corresponding features which have been described previously in conjunction with first axially displaceable guide device 300. Theoretically, additional (third, fourth, etc.) axially displaceable guide devices may be provided. The actuation of the second and/or additional guide devices may be carried out via a common actuator system or via an individual actuation and regulation device. As in a multilayer guide device, different types and different numbers of blades may be arranged in the diffuser area and also different positions and arrangements of the blades may be provided for multiple, independently operable guide devices for different operating points (in the compressor characteristic map). This facilitates in turn a more precise adaptation of the compressor characteristic map to the desired demands and to the size of the turbocharger. [0043] During operation, the position of the guide device(s) is controlled depending on the currently required demands at compressor 10, e.g., by a control device and via a corresponding regulating mechanism. For this purpose, different regulating parameters may be used, for example, at least partially the engine speed, the engine torque, the gas pedal position, pressure ratios in the compressor or engine, temperatures in the area of the engine and in the area of the compressor, etc.
Although the present invention has been described and is defined in the attached claims, it should be understood that the invention may also be alternatively defined according to the following embodiments:
A compressor (10) for a charging device comprising
a compressor housing (100),
a compressor backplate (200), and
a compressor wheel (400) which is arranged in the compressor housing (100),
wherein a diffuser (120) is formed radially outside of the compressor wheel (400) and between the compressor housing (100) and the compressor backplate (200),
characterized by a guide device (300) which is arranged and axially displaceable in the area of the diffuser (120), wherein the guide device (300) comprises a first ring element (310), a second ring element (330), and at least one blade (320) that is arranged between the first ring element (310) and the second ring element (330).
The compressor according to Embodiment 1, characterized in that a recess (210) is formed in the compressor backplate (200) and/or in the compressor housing (100) in the area of the guide device (300).
The compressor according to Embodiment 2, characterized in that the recess (210) is configured in such a way that the guide device (300) may be displaced from an extended position, in which flow passes through the blades (320) during operation, into a retracted position, in which the guide device (300) is located in the recess (210) and flow does not pass by the blades (320).
The compressor according to Embodiment 2 or Embodiment 3, characterized in that a second recess is additionally provided which is configured for accommodating only the first or only the second ring element (310, 330). The compressor according to Embodiment 3 or Embodiment 4, characterized in that opposing radial lateral surfaces of the first ring element (310) and the second ring element (330), between which the blades (320) are arranged, form the diffuser (120) in the extended position of the guide device (300).
The compressor according to any one of Embodiments 3 to 5, characterized in that the diffuser (120) is formed by a lateral surface of the first ring element (310), which faces in the direction of the compressor housing (100), and the compressor housing (100) in the retracted position of the guide device (300), or
the diffuser (120) is formed by a lateral surface of the second ring element (330), which faces in the direction of the compressor backplate (200), and the compressor backplate (200) in the retracted position of the guide device (300).
The compressor according to any one of the preceding embodiments, characterized in that the first ring element (310) and/or the second ring element (330) has a U-shaped cross section with first and second arms (332, 334).
The compressor according to Embodiment 7, characterized in that the recess (210) has grooves which are designed to guide and to at least partially accommodate the arms (332, 334) during displacement of the guide device (300).
The compressor according to any one of the preceding embodiments, characterized in that a lateral surface of the first and/or second ring element (310, 330) facing in the direction of the compressor backplate (200) is configured as flattened on its radially inner end so that a uniform transition between a surface of the compressor housing (100) or the compressor backplate (200) and the guide device (300) is formed in an extended position of the guide device (300).
The compressor according to any one of the preceding embodiments, characterized in that the blades (320) are fixedly connected to the first and second ring elements (310, 330).
The compressor according to any one of the preceding embodiments, characterized in that the first ring element (310) and the second ring element (330) are arranged concentrically with respect to an axis of rotation (500) of the compressor (10).
The compressor according to any one of the preceding embodiments, characterized in that a third ring element is provided, wherein the at least one blade between the first ring element and the second ring element contains a plurality of first blades, and a plurality of second blades is arranged between the second ring element and the third ring element.
The compressor according to Embodiment 12, characterized in that the first blades and the second blades differ in their shape, size, number, position, and/or arrangement.
The compressor according to any one of the preceding embodiments, characterized in that the blades (320) are arranged in a single row and optionally distributed uniformly in the circumferential direction. The compressor according to any one of Embodiments 1 to 14, characterized in that that the blades (320) are arranged in two or more rows and optionally distributed uniformly in the circumferential direction. The compressor according to any one of the preceding embodiments, characterized in that an actuating device is additionally provided which is designed to displace the guide device (300) between the retracted position and the extended position.
The compressor according to Embodiment 16, characterized in that the actuating device comprises an electromechanical device, a pneumatic device, or a hydraulic device.
The compressor according to Embodiment 16, characterized in that the actuating device comprises a magnet.
The compressor according to any one of Embodiments 16 to 18, characterized in that the guide device (300) and/or the actuating device comprises biasing means.
The compressor according to any one of the preceding embodiments, characterized in that the compressor backplate (200) is a separate component, or characterized in that the compressor backplate (200) is part of a bearing housing.
The compressor according to any one of the preceding embodiments, characterized in that the axially displaceable guide device (300) is a first axially displaceable guide device, and that a second axially displaceable guide device is provided which is arranged radially within or radially outside of the first axially displaceable guide device, and wherein the second axially displaceable guide device may have features corresponding to the first axially displaceable guide device (300) according to any one of the preceding embodiments.
A charging device for an engine with a compressor according to any one of the preceding embodiments.

Claims

Claims
A compressor (10) for a charging device comprising
a compressor housing (100),
a compressor backplate (200), and
a compressor wheel (400) which is arranged in the compressor housing (100),
wherein a diffuser (120) is formed radially outside of the compressor wheel (400) and between the compressor housing (100) and the compressor backplate (200),
characterized by a guide device (300) which is arranged and axially displaceable in the area of the diffuser (120), wherein the guide device (300) comprises a first ring element (310), a second ring element (330), and at least one blade (320) that is arranged between the first ring element (310) and the second ring element (330).
The compressor according to Claim 1, characterized in that a recess (210) is formed in the compressor backplate (200) and/or in the compressor housing (100) in the area of the guide device (300).
The compressor according to Claim 2, characterized in that the recess (210) is configured in such a way that the guide device (300) may be displaced from an extended position, in which flow passes through the blades (320) during operation, into a retracted position, in which the guide device (300) is located in the recess (210) and flow does not pass by the blades (320).
The compressor according to Claim 3, characterized in that opposing radial lateral surfaces of the first ring element (310) and the second ring element (330), between which the blades (320) are arranged, form the diffuser (120) in the extended position of the guide device (300). The compressor according to Claim 3 or Claim 4, characterized in that the diffuser (120) is formed by a lateral surface of the first ring element (310), which faces in the direction of the compressor housing (100), and the compressor housing (100) in the retracted position of the guide device (300), or
the diffuser (120) is formed by a lateral surface of the second ring element (330), which faces in the direction of the compressor backplate (200), and the compressor backplate (200) in the retracted position of the guide device (300).
The compressor according to any one of the preceding claims, characterized in that the first ring element (310) and/or the second ring element (330) has a U-shaped cross section with first and second arms (332, 334).
The compressor according to Claim 6, characterized in that the recess (210) has grooves which are designed to guide and to at least partially accommodate the arms (332, 334) during displacement of the guide device (300).
The compressor according to any one of the preceding claims, characterized in that a lateral surface of the first and/or second ring element (310, 330) facing in the direction of the compressor backplate (200) is configured as flattened on its radially inner end so that a uniform transition between a surface of the compressor housing (100) or the compressor backplate (200) and the guide device (300) is formed in an extended position of the guide device (300).
The compressor according to any one of the preceding claims, characterized in that a third ring element is provided, wherein the at least one blade between the first ring element and the second ring element contains a plurality of first blades, and a plurality of second blades is arranged between the second ring element and the third ring element. The compressor according to any one of the preceding claims, characterized in that the blades (320) are arranged in a single row and optionally distributed uniformly in the circumferential direction, or characterized in that that the blades (320) are arranged in two or more rows and optionally distributed uniformly in the circumferential direction.
The compressor according to any one of the preceding claims, characterized in that an actuating device is additionally provided which is designed to displace the guide device (300) between the retracted position and the extended position.
The compressor according to Claim 11, characterized in that the actuating device comprises an electromechanical device, a pneumatic device, or a hydraulic device.
The compressor according to Claim 11 or Claim 12, characterized in that the guide device (300) and/or the actuating device comprises biasing means.
The compressor according to any one of the preceding claims, characterized in that the axially displaceable guide device (300) is a first axially displaceable guide device, and that a second axially displaceable guide device is additionally provided which is arranged radially within or radially outside of the first axially displaceable guide device, and wherein the second axially displaceable guide device may have features corresponding to the first axially displaceable guide device (300) according to any one of the preceding claims. 15. A charging device for an engine with a compressor according to any one of the preceding claims.
EP17826391.9A 2016-12-16 2017-12-15 Compressor with displaceable guide device Withdrawn EP3555483A1 (en)

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