U.S. patent application number 12/912152 was filed with the patent office on 2011-04-28 for radial compressor.
This patent application is currently assigned to MANN+HUMMEL GMBH. Invention is credited to Robert Hanisch, Hedwig Schick.
Application Number | 20110097194 12/912152 |
Document ID | / |
Family ID | 43828713 |
Filed Date | 2011-04-28 |
United States Patent
Application |
20110097194 |
Kind Code |
A1 |
Schick; Hedwig ; et
al. |
April 28, 2011 |
Radial Compressor
Abstract
A radial compressor for a turbo charger has a housing with an
inflow passage and a spiral passage. A compressor wheel is
supported rotatably in the housing. The housing has at least two
housing parts between which a cavity is formed. At least one
opening is provided in the inflow passage, wherein the at least one
opening fluidically connects the cavity with the inflow
passage.
Inventors: |
Schick; Hedwig; (Tamm,
DE) ; Hanisch; Robert; (Remseck, DE) |
Assignee: |
MANN+HUMMEL GMBH
Ludwigsburg
DE
|
Family ID: |
43828713 |
Appl. No.: |
12/912152 |
Filed: |
October 26, 2010 |
Current U.S.
Class: |
415/119 ;
415/200 |
Current CPC
Class: |
F04D 29/4213 20130101;
F01D 25/26 20130101; F02M 35/1261 20130101; F05D 2220/40 20130101;
F04D 29/665 20130101; F02M 35/1266 20130101 |
Class at
Publication: |
415/119 ;
415/200 |
International
Class: |
F04D 29/66 20060101
F04D029/66; F01D 9/02 20060101 F01D009/02 |
Foreign Application Data
Date |
Code |
Application Number |
Oct 28, 2009 |
DE |
10 2009 051 104.0 |
Claims
1. A radial compressor for a turbo charger, comprising: a housing
comprising an inflow passage and a spiral passage; a compressor
wheel supported rotatably in said housing; wherein said housing is
comprised of at least two housing parts between which an acoustic
dampening cavity is formed; at least one opening provided in said
inflow passage, wherein said at least one opening fluidically
connects said cavity with said inflow passage.
2. The radial compressor according to claim 1, wherein said at
least two housing parts include a central housing part and wherein
said inflow passage is substantially formed by an axial section of
said central housing part.
3. The radial compressor according to claim 2, wherein said axial
section of said central housing part, said at least one opening is
a plurality of openings.
4. The radial compressor according to claim 3, wherein said
plurality of openings are slotted holes.
5. The radial compressor according to claim 4, wherein said slotted
holes extend parallel to one another in an axial direction of said
inflow passage.
6. The radial compressor according to claim 5, wherein said
plurality of openings are circular or polygonal.
7. The radial compressor according to claim 2, wherein said cavity
is annular and surrounds said axial section of said central housing
part.
8. The radial compressor according to claim 7, comprising an
annular radial partition that divides said cavity into an upper
subcavity and a lower subcavity each having a separate individual
volume.
9. The radial compressor according to claim 2, comprising three
axial partitions that divide said cavity into three ring segment
shaped subcavities that surround said axial section of said central
housing part.
10. The radial compressor according to claim 1, wherein said at
least two housing parts include a central housing part and a top
housing part, wherein said inflow passage is substantially formed
by an axial section of said top housing part and an axial section
of said central housing part.
11. The radial compressor according to claim 10, wherein said at
least one opening in said inflow passage is formed by a spacing
between said axial section of said top housing part and said axial
section of said central housing part.
12. The radial compressor according to claim 11, wherein said
spacing forms a slot extending in a circumferential direction of
said inflow passage.
13. The radial compressor according to claim 10, wherein said
cavity is annular and surrounds said axial section of said top
housing part and said axial section of said central housing
part.
14. The radial compressor according to claim 13, comprising an
annular radial partition that divides said cavity into an upper
subcavity and a lower subcavity each having a separate individual
volume.
15. The radial compressor according to claim 9, comprising three
axial partitions that divide said cavity into three ring segment
shaped subcavities that surround said axial section of said top
housing part and said axial section of said central housing
part.
16. The radial compressor according to claim 1, comprising a
partition that divides said cavity into two or more
subcavities.
17. The radial compressor according to claim 1, comprising at least
two axial partitions that divide said cavity into several
subcavities.
18. The radial compressor according to claim 1, wherein said at
least two housing parts are comprised of thermoplastic synthetic
material.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application claims the benefit under 35 USC 119 of
foreign application DE 10 2009 051 104.0 filed in Germany on Oct.
28, 2009, and which is hereby incorporated by reference in its
entirety.
BACKGROUND OF THE INVENTION
[0002] The invention concerns a radial compressor, especially for a
turbo charger, comprising a housing with an inflow passage and a
spiral passage, wherein in the housing a compressor wheel is
rotatably supported. The housing is comprised of at least two
housing parts between which at least one cavity is formed.
[0003] Turbo engines are generally used in connection with internal
combustion engines in order to compress, for the purpose of
increasing performance and efficiency, the sucked-in fresh air to a
higher pressure level. In case of exhaust gas turbo chargers the
housing is comprised of metal because of the high temperatures and
high pressures. Moreover, mechanically or electrically driven
compressors are known whose housing is comprised of plastic
material. When operating the compressor in particular at high
engine speeds significant noise is developed that, because of the
high frequencies, is perceived as disturbing and unpleasant. On the
one hand, these are constant sounds caused by natural dynamic
frequencies of the rotating shaft and the oil film. Moreover, there
exist numerous noises variable with regard to their frequency
spectra that are caused, for example, by shaft imbalances,
pulsation phenomena, aerodynamic effects (for example, flow about
the compressor or turbine vanes). The frequency range of these
problem noises are in general within a very broad bandwidth of
approximately 1,000 Hz to 20,000 Hz. These noises are partially
introduced as structure-borne sound into the structure and radiate
from there outwardly. A further portion of the disturbing noises is
emitted directly as airborne sound. This airborne sound propagates
along the airborne sound pathways.
[0004] In order to dampen the sound that is emitted to the exterior
by the turbo charger, in DE 10112764 A1 a radial compressor has
been proposed whose housing and pressure-side socket are comprised
of plastic material. For noise damping in the area of the spiral
housing, acoustically acting openings are provided that are
designed as blind bores or are formed as chambers that are
separated by a perforated sheet from the flow passage.
[0005] DE 202007016282 U1 discloses a housing for a radial
compressor that is comprised of three housing parts that are
connected to one another at joining or connecting surfaces.
SUMMARY OF THE INVENTION
[0006] It is therefore an object of the present invention to
propose a radial compressor of the aforementioned kind where a
significant noise reduction is realized at the housing in a simple
way.
[0007] In accordance with the present invention, this is achieved
in that at the inflow passage at least one opening is provided by
means of which the cavity is in fluidic communication with the
inflow passage.
[0008] The present invention is based on the concept that sound
waves that are propagating in the direction of the air intake
opening, in addition to noise emission of the air-guiding parts,
also negatively affect the outlet noise. This effect is
counteracted in that between the housing parts at least one
acoustic dampening cavity is provided that by means of at least one
opening is connected fluidically to the inflow passage. Since the
openings are provided in the intake cross-section of the
compressor, acoustic damping possibilities are provided directly at
the source of the sound in this way.
[0009] According to a preferred embodiment of the invention, the
inflow passage is substantially formed by an axial section of a
central housing part. Alternatively, the inflow passage may be
formed substantially by an axial section of a top housing part and
an axial section of the central housing part.
[0010] There are various options for designing the openings that
connect the inflow passage fluidically with the cavity. One of
these design options provides that the opening in the intake
passage is formed by a spacing between axial sections of the top
housing part and the central housing part. This spacing provides a
slot extending in circumferential direction between the axial
sections.
[0011] Alternative designs reside in that in the axial sections a
plurality of openings are provided. These openings can be formed,
for example, as slotted holes that extend preferably parallel to
one another in axial direction of the inflow passage. It is also
possible to design the openings to be of a circular shape or a
polygonal shape. A particularly preferred embodiment of the
invention resides in that a partition is provided by means of which
two or more subcavities are formed. In this way, individual volumes
are provided; it is possible that these individual volumes are
differently sized or are of the same size. For a multi-part design
of the housing it is expedient that the cavity is of an annular
design and surrounds the axial section or axial sections.
[0012] As a partition, for example, an annular radial partition may
be provided that separates an upper subcavity and a lower
subcavity, each having an individual volume, from one another.
Alternatively, it is also possible to provide axial partitions
wherein two or several partitions form a corresponding number of
subcavities. In this connection, preferably three axial partitions
are provided that surround the axial section(s) and in this way
form three ring segment-shaped subcavities.
[0013] The housing parts are comprised preferably of a
thermoplastic synthetic material, for example, PPS (polyphenyl
sulfide). The connection of the housing parts with one another is
realized, for example, by friction welding.
BRIEF DESCRIPTION OF THE DRAWING
[0014] FIG. 1 shows an axial section of a housing of a radial
compressor;
[0015] FIG. 1A shows an axial section of a housing of a radial
compressor of FIG. 1 including a schematic depiction of a
compressor wheel rotatably supported in the housing;
[0016] FIG. 2 shows an illustration of an alternative embodiment of
the housing according to FIG. 1;
[0017] FIG. 3 shows a further alternative embodiment of the housing
according to FIG. 1.
[0018] FIG. 4 is an illustration according to FIG. 2 with an
annular radial partition for forming two subcavities.
[0019] FIG. 5 is an illustration according to FIG. 3 with axial
partitions for forming several subcavities.
[0020] FIG. 6 is a schematic illustration of subcavities that are
formed by the partitions of FIG. 5.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0021] FIG. 1 shows a housing 1 that is comprised of three housing
parts wherein between the top part 2 and the bottom part 3 a
central part 4 is arranged. These housing parts 2, 3, 4 are
comprised of a thermoplastic synthetic material, for example, PPS
(polyphenyl sulfide). On the top part 2 there are two annular
joining or connecting surfaces 5, 6 wherein on the connecting
surface 5 an end face 7 of the bottom part 3 and on the connecting
surface 6 a contact surface 8 of the central part 4 are resting.
The connecting surface 5 and the end face 7 as well as the
connecting surface 6 and the contact surface 8 form welding zones,
respectively, where the parts are integrally joined or bonded. FIG.
1A shows the radial compressor housing of FIG. 1 including a
schematic depiction of a compressor wheel 52 rotatably supported in
the housing.
[0022] On the top part 2 a curved portion 9 that is open in
downward direction is formed that extends in an annular shape and
is widening in the circumferential direction. On the radially
inwardly positioned end of this curved portion 9 the connecting
surface 6 is formed. The contact surface 8 is adjoined by a rounded
section 10 that is matched to the shape of the curved portion 9 and
is formed on the central part 4. The central part 4 comprises also
an axial section 11 with a rounded portion 12 adjoining the radial
section 13 to which the rounded section 10 is integrally and
monolithically connected.
[0023] On the top part 2 an axial section 14 is formed that is
aligned with the axial section 11 of the central part 4. The axial
sections 11, 14 form an inflow passage 19 wherein between the
sections 11 and 14 a spacing exists by means of which a slot 15 is
formed that extends in circumferential direction. The axial section
14 of the top part 2 is connected by wall parts 16, 17 with the
curved part 9. These wall parts 16, 17 as well as the axial
sections 11, 14, rounded portion 12, and radial section 13 delimit
an annular cavity 18 that extends about the axial sections 11, 14
that is fluidically connected by the slot 15 with the inflow
passage 19 formed by the axial sections 11, 14. As can be seen in
FIG. 1, the annular acoustic dampening cavity 18 is arranged
between the axial sections 14, 11 and spiral passage 24, with the
axial sections 11,14 radially inwardly relative to the annular
cavity 18 and the spiral passage 24 arranged radially outwardly
from the annular cavity 18.
[0024] The bottom part 3 is substantially formed as an annular
curved portion 20 that widens in circumferential direction and is
provided at its radial external side with an axially upwardly
extending sleeve 21 having at its upper end the end face 7. On the
inner wall of the sleeve 21 an axial section 22 of the top part 2
is resting so that in this area the housing 11 is of a double-wall
configuration. The bottom part 3 is formed at its bottom side for
receiving a housing bottom, not illustrated in the drawing, wherein
on the bottom housing part 3 radially inwardly oriented projections
23 are provided. As can be seen in the illustration, the curved
portion 9 of the top part 2, the rounded section 10 of the central
part 4, and the curved portion 20 of the bottom part 3 together
form a spiral passage 24. An axis 50 is shown identifying an axial
direction relative to housing 1.
[0025] FIG. 2 shows the housing 1 in an alternative embodiment
wherein the central part 4 is provided with a longer axial section
27 that extends up to the bottom edge of the radially extending
wall part 16. On the bottom edge of the wall part 16 a further
connecting surface 25 is provided that is abutted by an end face 26
of the section 27; the top part 2 and the central part 4 are
integrally joined or bonded at the surfaces 25, 26 as well as at
the surfaces 6 and 8. In the cylindrically embodied section 27 a
plurality of slotted holes 28 is arranged that, in the illustrated
embodiment, are formed as parallel extending slots and fluidically
connect the cavity 18 with the inflow passage 19. In other
respects, same parts are identified with same reference numerals as
in FIG. 1 so that reference is being had to the description of FIG.
1.
[0026] In FIG. 3 a further embodiment of the housing 1 is shown
that differs from that of FIG. 2 in that in the cylindrically
embodied axial section 27 circular openings 29 are arranged by
means of which the cavity 18 is fluidically connected with the
inflow passage 19. Of course, also other shapes of the openings are
possible, for example, shaped as irregular polygons or as regular
polygons. In other respects, same parts are identified with same
reference numerals as in FIG. 2.
[0027] In FIG. 4, an illustration similar to that of FIG. 2 is
shown but in contrast thereto in FIG. 4 an annular radial partition
30 is provided in the cavity surrounding the radial section 27 so
that in this illustration of the housing 1 an upper subcavity 31
and a lower subcavity 32 are formed. Each one of the subcavities
31, 32 is fluidically connected by slotted holes 28 with the inflow
passage 19. In other respects, same parts are identified with same
reference numerals as in FIG. 2.
[0028] FIG. 5 shows an embodiment variant of FIG. 3 wherein in the
cavity surrounding the axial section 27 at least two axially
aligned partitions 34 are arranged; in FIG. 5 only one partition 34
is illustrated. These partitions 34 serve for forming several
subcavities 33 as indicated schematically in the illustration of
FIG. 6. In other respects, same parts are identified with same
reference numerals as in FIG. 3.
[0029] Separation into several cavities 31, 32 in FIG. 4 as well as
33 in FIGS. 5 and 6 provides for boxing of the volume, i.e.,
formation of two or several individual volumes. These individual
volumes may be of the same size or may be differently sized.
[0030] While specific embodiments of the invention have been shown
and described in detail to illustrate the inventive principles, it
will be understood that the invention may be embodied otherwise
without departing from such principles.
* * * * *