KR20170026853A - Turbo charger for vehicle - Google Patents

Turbo charger for vehicle Download PDF

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Publication number
KR20170026853A
KR20170026853A KR1020150122373A KR20150122373A KR20170026853A KR 20170026853 A KR20170026853 A KR 20170026853A KR 1020150122373 A KR1020150122373 A KR 1020150122373A KR 20150122373 A KR20150122373 A KR 20150122373A KR 20170026853 A KR20170026853 A KR 20170026853A
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KR
South Korea
Prior art keywords
housing
guide
air
passage
spacing
Prior art date
Application number
KR1020150122373A
Other languages
Korean (ko)
Inventor
정경재
Original Assignee
현대위아 주식회사
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Filing date
Publication date
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Priority to KR1020150122373A priority Critical patent/KR20170026853A/en
Publication of KR20170026853A publication Critical patent/KR20170026853A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B39/00—Component parts, details, or accessories relating to, driven charging or scavenging pumps, not provided for in groups F02B33/00 - F02B37/00
    • 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
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/522—Casings; Connections of working fluid for axial pumps 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
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/541—Specially adapted for elastic fluid pumps
    • 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
    • F05D2220/00—Application
    • F05D2220/40—Application in turbochargers
    • 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
    • F05D2240/00—Components
    • F05D2240/10—Stators
    • F05D2240/12—Fluid guiding means, e.g. vanes
    • Y02T10/144—

Abstract

The present invention relates to a turbocharger for an automobile, and more particularly, to a turbocharger for an automobile, which comprises a housing part, a passage part communicating with the air supply part and guiding air, formed in the housing part, And a guide portion mounted on the housing portion and protruding from the passage portion to prevent the return to the compression wheel portion, so that the operating region can be expanded to improve the output and improve fuel economy.

Figure P1020150122373

Description

{TURBO CHARGER FOR VEHICLE}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to an automotive turbocharger, and more particularly, to an automotive turbocharger that increases the operating range of a compressor to increase the output of the engine and improve fuel economy.

Generally, an automotive turbocharger is a device for turning the turbine by using the exhaust gas pressure of the engine, which is necessarily generated in the internal combustion engine, and then pushing the sucked air to a pressure higher than atmospheric pressure by using the rotational force to increase the output of the engine .

The purpose of the car turbocharger is to go beyond the basic limit of the engine and to increase the output efficiency relative to the volume. In a naturally aspirated engine, when the piston descends from the top dead center to the bottom dead center, the pressure inside the cylinder is lowered below the atmospheric pressure due to the volume change inside the cylinder, and the air and fuel mixture is naturally drawn into the cylinder. The amount of air supplied to the combustion chamber and the amount of fuel accordingly becomes an important factor in determining the limit of the engine because the amount of intake air and the fuel mixer must be increased to increase the pushing force of the piston in the explosion stroke. The turbocharger has a structure in which a turbine and a gas compressor are connected to each other in a snail-shaped container, and the exhaust gas flowing in the exhaust manifold is sent to the turbine inlet to rotate the turbine blades. This rotational force causes the gas compressor to operate, and the gas compressor compresses the air and delivers it to the air intake of the engine. The compressed air is mixed with more fuel and the mixer is delivered into the engine cylinder to increase the efficiency of the engine.

In the case of a turbocharger for automobiles, a vaneless diffuser is being used as it requires a wide operating range. In the case of a vane-less diffuser, the operating range of the compressor is determined by the flow state at the wheel outlet end. The flow at the end of the wheel shows jet flow and wake flow. The jet flow is a flow that is ideally defined as the flow appearing on the bottom surface of the compressor wheel outlet and on the surface pushing and rotating on rotation. The wake flow is a flow that appears at the top of the compressor wheel outlet and opposite to the side pushing the flow, leaving the density low and closer to the wheel as it leaves the wheel. As the flow back to the wheel during wake flow increases, a surge appears. Thus, in the case of a vane-less diffuser, the map is expanded by a wheel.

Meanwhile, various vane diffusers are used for wider map expansion. However, separate actuators and mechanisms are applied to the variable vane operation, which complicates the structure and increases the cost. Therefore, there is a need to improve this.

BACKGROUND ART [0002] The background art of the present invention is disclosed in Korean Patent Laid-Open Publication No. 2005-0000319 (published on Mar. 13, 2005, entitled "Turbocharger").

SUMMARY OF THE INVENTION The present invention provides a turbocharger for a motor vehicle which improves the output of the engine and improves the fuel economy by preventing the wake flow from entering the compressor outlet end to increase the operating range of the compressor It has its purpose.

An automotive turbocharger according to the present invention comprises: a housing part; A passage portion formed in the housing portion and communicating with the air supply portion to guide the air; A compression wheel unit that is built in the housing unit and compresses the air flowing into the housing unit while rotating to supply the compressed air to the passage unit; And a guide portion mounted on the housing portion and protruding from the passage portion to prevent a flow returning to the compression wheel portion.

Wherein the housing portion comprises: a housing inlet portion into which air flows; A housing cover portion extending from the housing entrance portion and surrounding the guide portion; A housing spacing part extending from the housing cover part and spaced apart from the guide part; A housing fastening portion extending from the housing spacing portion and forming the passage portion; An upper main portion formed by a difference in inner diameter between the housing inlet portion and the housing cover portion; A stopper portion formed by a difference in inner diameter between the housing cover portion and the housing portion; And a lower end portion formed by a difference in inner diameter between the housing spacing portion and the housing engagement portion.

The guide portion may include: a guide duct portion which is caught by the upper end portion of the main body and is in close contact with the housing cover portion to guide air; A guide spacing portion extending from the guide duct portion and spaced apart from the housing spacing portion; A guide extension part protruding laterally from an end of the guide spacing part and hooked to the lower end part of the guide part to guide air to the passage part; And a guide protrusion protruding at least one in the circumferential direction in the guide extension part and preventing a flow from the passage part toward the compression wheel part.

And the thickness of the guide projection portion is 20% to 60% of the width of the passage portion.

Wherein the guide portion comprises: an upper hole portion formed at least one in the circumferential direction of the guide spacing portion and formed above the compression wheel portion and through which air passes; And a lower hole portion formed at least one in the circumferential direction of the guide spacing portion and formed in a lateral direction of the compression wheel portion to allow air to pass therethrough.

The turbocharger for a motor vehicle according to the present invention prevents the flow through the guide portion to the compression wheel portion, so that the surge region can be increased by reducing the wake flow.

The turbocharger for a car according to the present invention can bypass the air through the upper hole portion and the lower hole portion formed in the guide portion, thereby increasing the choke flow rate and increasing the surge flow rate.

1 is a cross-sectional view schematically showing an automotive turbocharger according to an embodiment of the present invention.
FIG. 2 is a view schematically showing a housing part in a car turbocharger according to an embodiment of the present invention.
3 is a view schematically showing a guide part in a car turbocharger according to an embodiment of the present invention.
4 is a view schematically showing a flow of a guide protrusion in a car turbocharger according to an embodiment of the present invention.
FIG. 5 is a view schematically showing choke flow in a car turbocharger according to an embodiment of the present invention.
6 is a schematic diagram illustrating a surge flow in an automotive turbocharger according to an embodiment of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a car turbocharger according to the present invention will be described with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. Further, terms to be described below are terms defined in consideration of functions in the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

1 is a cross-sectional view schematically showing an automotive turbocharger according to an embodiment of the present invention. 1, an automotive turbocharger 1 according to an embodiment of the present invention includes a housing part 10, a passage part 20, a compression wheel part 30, and a guide part 40 do.

The housing part 10 can be mounted on the vehicle body and can have a duct shape capable of inflow of air. The housing part (10) is provided with a passage part (20) for guiding air. The compression wheel 30 is housed in the housing part 10 and compresses the air flowing into the housing part 10 and supplies the compressed air to the passage part 20.

For example, a turbine portion 110 for rotating the compression wheel portion 30 by the exhaust gas discharged from the engine portion 100 may be disposed on the opposite side of the housing portion 10. When the compressor wheel portion 30 is rotated by the turbine portion 110, air can be introduced into the housing portion 10 and compressed. The compressed air can be supplied to the engine unit 100 after being moved to the air supply unit 120 through the passage portion 20.

The compression wheel portion 30 may include a compression shaft portion 31 that rotates in conjunction with the turbine portion 110 and a compression blade portion 32 that is formed in the compression shaft portion 31 and compresses the air. The compression blade portion 32 protrudes in the lateral direction of the compression shaft portion 31 and can be formed to have various shapes according to the design.

The guide portion 40 is mounted to the housing portion 10 and prevents the flow of the flow protruding from the passage portion 20 and returning to the compression wheel portion 30. [ That is, the guide portion 40 prevents the wake flow from moving to the compression wheel portion 30, and does not restrict the movement of the jet flow.

FIG. 2 is a view schematically showing a housing part in a car turbocharger according to an embodiment of the present invention. 1 and 2, a housing part 10 according to an embodiment of the present invention includes a housing inlet part 11, a housing cover part 12, a housing spacing part 13, An upper lid 15, a lower lid 16, and a lower lid 17. As shown in Fig.

The housing inlet portion 11 is opened at one side and air is introduced through the opened portion. For example, the housing inlet portion 11 may have a cylindrical shape. An inclined surface portion 111 may be formed on the inside of the housing inlet portion 11 so as to guide air to the guide portion 40 built in the housing portion 10. [

The housing cover portion 12 extends in the other direction from the housing inlet portion 11 and surrounds the guide portion 40. For example, the housing cover portion 12 may be joined to the outer surface of the guide portion 40 adjacent to each other.

The housing cover portion 12 is designed to have an inner diameter larger than the housing inlet portion 11 and the upper muffler portion 15 is formed due to the difference in inner diameter between the housing inlet portion 11 and the housing cover portion 12.

The housing spacing portion 13 extends from the housing cover portion 12 and is spaced apart from the guide portion 40. For example, the housing spacing portion 13 is formed to have an inner diameter larger than the outer diameter of the guide portion 40, and a flow space 131 may be formed between the guide portion 40 and the housing spacing portion 13 .

The housing spacing portion 13 is designed to have an inner diameter larger than that of the housing cover portion 12 and the stop portion 16 is formed due to the difference in inner diameter between the housing cover portion 12 and the housing spacing portion 13.

The housing latching portion 14 extends from the housing spacing portion 13 and forms the passage portion 20. The housing engagement portion 14 is designed to have a larger inner diameter than the housing engagement portion 13 and the lower engagement portion 17 is formed due to the difference in inner diameter between the housing engagement portion 13 and the housing engagement portion 14.

3 is a view schematically showing a guide part in a car turbocharger according to an embodiment of the present invention. 4 is a view schematically illustrating a flow of a guide protrusion in a car turbocharger according to an embodiment of the present invention. FIG. 5 is a view illustrating a flow of choke in a car turbocharger according to an embodiment of the present invention. FIG. 6 is a view schematically showing a surge flow in an automotive turbocharger according to an embodiment of the present invention. FIG. 1 to 5, the guide portion 40 includes a guide duct portion 41, a guide spacing portion 42, a guide extension portion 43, and a guide projection portion 44.

The guide duct portion 41 is caught by the upper end portion 15 and closely contacts the housing cover portion 12 to guide the air. For example, the guide duct portion 41 may have a cylindrical shape and an upper end portion may be in close contact with the upper end portion 15 to be joined. The outer surface of the guide duct portion 41 can be engaged with the inner surface of the housing cover portion 12. [

The guide spacing portion 42 extends from the guide duct portion 41 and is spaced apart from the housing spacing portion 13. For example, a flow space 131 in which air can move is formed between the guide spacing portion 42 and the housing spacing portion 13.

The guide extension 43 protrudes laterally from the end of the guide spacing 42. The guide extension portion 43 is caught by the lower step portion 17 and guides the air to the passage portion 20. For example, the guide extension 43 may be formed in the shape of a bar. At this time, the thickness a from the housing engagement portion 14 to the passage portion 20 may correspond to the thickness b of the guide extension portion 43. A part of the guide extension part (43) can be brought into close contact with the housing fastening part (14) to realize the passage part (20). The thickness of the guide extension portion 43 can be adjusted so that the width c of the passage portion 20 is kept constant.

The guide projection 44 protrudes at least one in the circumferential direction in the guide extension 43 to prevent the flow from the passage 20 toward the compression wheel 30. For example, the guide protrusions 44 may protrude uniformly in the circumferential direction of the guide extensions 43. The thickness of the guide protrusions 44 may be 20% to 20% of the width c of the passages 20, 60%. The guide protrusion 44 can limit the flow rate of the backward flow in the passage portion 20 and the movement to the pushing-out wheel portion 30 without restricting the flow rate of the fluid flowing through the passage portion 20 to the supply portion 120 .

The guide portion 40 may be formed separately from the housing portion 10 and the guide portion 40 may be coupled to the housing portion 10. The guide portion 40 can be bolted to or joined to the housing portion 10. In addition, the guide portion 40 can be molded integrally with the housing portion 10.

The guide part 40 may further include an upper hole part 45 and a lower hole part 46 according to an embodiment of the present invention. At least one of the upper and lower hole portions 45 and 46 is formed in the circumferential direction of the guide spacing portion 42. At this time, the upper hole portion 45 is disposed above the lower hole portion 46. The upper hole portion 45 is formed above the compression wheel portion 30 and the lower hole portion 46 is formed laterally of the compression wheel portion 30 to allow air to pass therethrough. For example, the upper hole portion 45 may be positioned above the upper end of the compression blade portion 32. The lower hole portion 46 is located below the upper end of the compression blade portion 32 and can be located above the housing engagement portion 14. [

The operation of the automotive turbocharger according to an embodiment of the present invention will now be described.

The guide portion 40 is mounted inside the housing portion 10 and the compression wheel portion 30 disposed inside the guide portion 40 is rotated by the turbine portion 110 rotated by the exhaust gas. The compressed wheel 30 is rotated to compress the air that has flowed into the housing unit 10 and the compressed air is moved to the air supply unit 120 through the passage unit 20. [ The air in the air supply unit 120 is supplied to the engine unit 100 to improve the output.

The guide protrusion 44 formed in the guide portion 40 may protrude in the width c direction of the passage portion 20 to expand the operation region. 4, the jet flow during the flow generated by the compression wheel portion 30 passes through the passage portion 20 bypassing the guide projection portion 44, and the wake flow is clogged by the guide projection portion 44, (30) is limited. This increases the surge area due to wake flow reduction.

Meanwhile, the operation area can be expanded by bypassing the air through the upper hole 45 and the lower hole 46 formed in the guide part 40.

That is, referring to FIG. 5, in the case of choke flow rate at which air flows at a speed of sound 1, when the air flowing into the compression wheel 30 reaches a speed of sound 1, Lt; / RTI > does not increase any more. At this time, when the air introduced into the upper hole portion 45 formed above the compression blade portion 32 flows into the compression wheel portion 30 through the lower hole portion 46, the choke area is increased.

6, when the flow rate of the air flowing into the compression wheel 30 is reduced, the reverse flow rate from the outlet end of the compression wheel 30 reaches the inlet end of the compression wheel 30, The pressure fluctuation of the flow rate becomes large. At this time, when the backflow flow rate flows into the lower hole portion 46 and is discharged to the upper hole portion 45, the surge region is increased by delaying the backflow flow rate from being formed to the inlet end of the compression wheel portion 30.

The turbocharger 1 for an automobile according to the embodiment of the present invention prevents the movement of the turbocharger 1 to the compression wheel 30 through the guide protrusion 44 formed in the guide portion 40, Can be increased.

The turbocharger 1 for an automobile according to the embodiment of the present invention bypasses the air through the upper hole 45 and the lower hole 46 formed in the guide portion 40 to increase the choke flow rate, Can be increased.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. I will understand. Accordingly, the true scope of protection of the present invention should be defined by the following claims.

10: housing part 11: housing inlet part
12: housing cover part 13: housing part
14: housing locking portion 15: upper chute
16: Stopped car 17: Lower carousel
20: passage portion 30: compression wheel portion
31: compression shaft part 32: compression blade part
40: guide portion 41: guide duct portion
42: Guide separation part 43: Guide extension part
44: Guide protrusion 45: Upper hole
46: lower hole portion 100: engine portion
110: turbine section 120:

Claims (5)

A housing part;
A passage portion formed in the housing portion and communicating with the air supply portion to guide the air;
A compression wheel unit that is built in the housing unit and compresses the air flowing into the housing unit while rotating to supply the compressed air to the passage unit; And
And a guide portion mounted on the housing portion and protruding from the passage portion to prevent a flow returning to the compression wheel portion.
2. The apparatus of claim 1, wherein the housing portion
A housing inlet portion into which air flows;
A housing cover portion extending from the housing entrance portion and surrounding the guide portion;
A housing spacing part extending from the housing cover part and spaced apart from the guide part;
A housing fastening portion extending from the housing spacing portion and forming the passage portion;
An upper main portion formed by a difference in inner diameter between the housing inlet portion and the housing cover portion;
A stopper portion formed by a difference in inner diameter between the housing cover portion and the housing portion; And
And a lower end portion formed by a difference in inner diameter between the housing spacing portion and the housing engagement portion.
3. The apparatus of claim 2, wherein the guide portion
A guide duct portion which is caught by the upper lobe portion and is in close contact with the housing cover portion to guide air;
A guide spacing portion extending from the guide duct portion and spaced apart from the housing spacing portion;
A guide extension part protruding laterally from an end of the guide spacing part and hooked to the lower end part of the guide part to guide air to the passage part; And
And a guide protrusion protruded at least one in the circumferential direction at the guide extension part and preventing a flow from the passage part toward the compression wheel part.
The method of claim 3,
Wherein the thickness of the guide protrusion is 20% to 60% of the width of the passage.
The method of claim 3,
An upper hole formed at least one in the circumferential direction of the guide spacer and formed above the compression wheel to allow air to pass therethrough; And
Further comprising a lower hole portion formed at least in the circumferential direction of the guide spacing portion and formed in a lateral direction of the compression wheel portion to allow air to pass therethrough.
KR1020150122373A 2015-08-31 2015-08-31 Turbo charger for vehicle KR20170026853A (en)

Priority Applications (1)

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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150122373A KR20170026853A (en) 2015-08-31 2015-08-31 Turbo charger for vehicle

Publications (1)

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KR20170026853A true KR20170026853A (en) 2017-03-09

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