KR20180108462A - Compressor for a turbocharger - Google Patents

Abstract

A compressor for a turbocharger includes: a compressor housing (10) having an air inlet (11) for receiving air to be compressed and an air outlet (12) for discharging compressed air to the outside; a driving shaft extending axially, rotatably mounted in the compressor housing (10), and rotatably driven through a driving unit; a compressor impeller disposed in the compressor housing (10) and on the driving shaft (30) with respect to the air flow path between the air inlet (11) and the air outlet (12); a diffuser passage extending radially in the compressor housing (10) and including first and second radial walls; a compressor volute serving as a passage to the compressor impeller (40) through a diffuser passage (14), and directed to the air outlet (12); and a blade-less type outlet guide unit disposed radially in the diffuser passage (14) and attached to the first radial wall (22) of the diffuser passage (14). Accordingly, the compressor having the blade-less type outlet guide unit has improved functional stability.

Description

[0001] COMPRESSOR FOR A TURBOCHARGER [0002]

The present invention relates to a compressor for a turbocharger according to claim 1.

Radial flow compressors, such as those described in WO 2014/01275 A1, typically include an inlet duct through which fluid flows, the radial compressor acting to drive the fluid or Further comprising an impeller and an outlet duct serving to compress the fluid, through which the compressed fluid exits the radial compressor again. In the case of radial compressors, a so-called outlet guide unit is located in the outlet duct, in the flow direction, behind the compressor impeller, the outlet guide unit being formed by a diffuser passage, Shaped ducts. This outlet guide unit serves to delay the flow behind the impeller so that the fluid is further reduced to the potential energy of the kinetic energy before it is adjusted in the annular duct (compressor volute) The pressure is increased in that the conversion takes place. In some cases, a fixed, usually profiled, outlet guide blade is installed in the diffuser passage described above, which serves to change the characteristic curve of the compressor and is thus often a bladed diffuser or outlet guide unit Lt; / RTI > These outlet guide blades are generally a component connected to the diffuser wall and apply pressure using the blunt end of the outlet guide blade to the opposing housing wall. Disadvantages associated with flow, which cause a so-called clearance loss between the outlet guide blade and the housing, can be reduced in the manner described above. In the prior art, radial compressors are likewise known, in which the aforementioned outlet guide blades are rotatably adjustable or rotatable for the purpose of controlling or regulating the compressor.

In addition, a compressor with a so-called bladeless outlet guide unit, that is, an outlet guide unit without an outlet guide blade, is also known from the prior art, in which case the blade- Is inserted into the diffuser passage from behind the compressor impeller. The bladeless type outlet guide unit is not capable of jamming in the housing through the outlet guide blades and thus has the disadvantage that a connecting element such as a screw must be employed to attach the bladeless type outlet guide unit to the housing Respectively. However, in the event of such a connection failure, the blade-less outlet guide unit may come into contact with the compressor impeller and cause significant damage to the compressor.

Accordingly, the present invention is based on the object of further improving a compressor with a blade-less type outlet guide unit in a manner with improved functional stability. Furthermore, a turbocharger with such a compressor is also available.

According to the present invention, this object is solved by the features of claim 1 and claim 9. Further advantageous improvements of the invention are the subject of the appended dependent claims.

The present invention relates to a compressor for a turbocharger comprising a compressor housing having at least the following elements: an air inlet for receiving air to be compressed in the compressor and an air outlet for discharging compressed air from the compressor to the outside, ; A drive shaft extending axially, the drive shaft rotatably mounted within the compressor housing and rotatably driven through a drive acting on the drive shaft; A compressor impeller comprising: a compressor impeller disposed in a compressor housing and on a drive shaft for an air flow path between an air inlet and an air outlet; A diffuser passage extending radially within the compressor housing, the diffuser passage having a first radial wall and a second radial wall; A compressor volute, acting as an air passage through the diffuser passage to the compressor impeller and directed to the air outlet; And a blade-less outlet guide unit disposed in the radial diffuser passage and attached to the first radial wall of the diffuser passage, wherein the separate blade-less outlet guide unit includes a separate blade- And an axial clear width is present between the second radial walls of the diffuser passage which are axially opposed to the lean-type outlet guide unit.

According to the invention, said separate bladeless type outlet guide unit is formed as an annular disc which comprises a first pipe section coaxial with the drive shaft and resting on the second radial wall of the diffuser passage in the radially inner diameter region, The first pipe section has a specific axial dimension and the radially inner circumferential surface of the first pipe section lies radially opposite one section of the compressor housing, Direction size. The first pipe section specifically surrounds the drive shaft and the compressor impeller.

The radially inner circumferential surface of the first pipe section lies radially opposed to a section of the compressor housing and additionally comprises a separate bladeless outlet guide unit and axially opposed bladeless outlet guide unit Free outlet guide unit from the first radial wall of the diffuser passageway unintentionally because the axial azimuth between the second radial walls of the diffuser passage located in the diffuser passage is smaller than the axial dimension of the first pipe section It is ensured that the separate bladeless type outlet guide unit can not be brought into contact with the compressor wheel. In this case, the first pipe section of the separate blade-less outlet guide unit impinges on the section of the compressor housing or the second radial wall of the diffuser passage located radially opposite the diffuser passage, but the rest of the diffuser passage The axial rest number is too narrow so that the separate bladeless type outlet guide unit can not be brought into contact with the compressor wheel by the axial movement and / or the radial movement of the separate bladeless type outlet guide unit.

For this reason, the geometrical shape of the separate bladeless type outlet guide unit is, according to the invention, formed by the axial size of the first pipe section, which geometry is in the axial direction with respect to the number of the diffuser passages Which is too large to allow axial and / or radial movement of the separate bladeless type outlet guide unit, which is too large to be brought into contact with the compressor wheel when the connection to the compressor housing is inadvertently dropped. Accordingly, the problem mentioned above can be solved by the present invention, that damage to the compressor may occur when the connection between the separate bladeless type outlet guide unit and the compressor housing is damaged. In short, the functional stability of the compressor is improved thereby.

By the measures described in the dependent claims, advantageous further improvements and improvements of the invention mentioned in the independent claims are possible.

Particularly preferably, the first radial wall of the diffuser passage forms part of the compressor volute.

According to a further refinement, the annular disk comprises a second pipe section deviating from the first pipe section, the second pipe section being coaxial with the drive shaft and backing the second radial wall of the diffuser passage, Centering the disk. Here, the second pipe section can be specifically centered at the radially inward step of the second radial wall of the diffuser passage. Specifically, the second pipe section may have a larger inner diameter than the first pipe section.

At least the first pipe section may be formed as one part with the annular disc, and the second pipe section may also be formed, for example, in the annular disc.

According to a particularly preferred embodiment, the radial inner diameter of the first pipe section lies radially opposed to the insert part, which inserts into the air inlet side of the compressor housing and encompasses the compressor impeller in the radial direction. Such an insert part then forms, for example, a part of the compressor housing.

Specifically, a connecting element such as a screw may be provided, by means of which the bladeless type outlet guide unit or annular disc is detachably attached to the first radial wall of the diffuser passage.

According to a further preferred refinement, the axial confinement between the separate, bladeless-type outlet guide unit or annular disc and the second radial wall of the diffuser passage located axially opposite to them is at least It can be constant at the maximum part.

The present invention also relates to a turbocharger, and more particularly to an exhaust gas turbocharger equipped with a compressor comprising the above.

Preferably, the turbocharger is a turbine comprising a turbine impeller defining a turbine housing and a drive to a drive shaft, wherein the turbine impeller is disposed on a drive shaft within the turbine housing. Here, the turbine housing is preferably connected to the compressor housing.

In the following, the present invention will be described in more detail using exemplary embodiments with reference to the accompanying drawings.
1 is a cross-sectional view of a turbocharger equipped with a compressor according to a preferred embodiment of the present invention.
Fig. 2 is an enlarged view derived from the compressor of Fig. 1;

As shown in Fig. 1, the turbocharger includes a turbine 2, which in this case is driven by the exhaust gas of an internal combustion engine, for example, and a compressor 1 driven by the turbine 2. In other words, the turbocharger shown in Fig. 1 is an exhaust gas turbocharger.

The compressor 1 comprises a compressor housing 10 having an air inlet 11 for receiving air to be compressed in the compressor 1 and an air outlet 12 for discharging the air compressed in the compressor 1 to the outside, ; A drive shaft rotatably mounted within a compressor housing (10), comprising: a drive shaft (30) rotatably driven through a drive of a turbine (2) acting on the drive shaft; And a compressor impeller 40 having a blades 41 which is arranged within the compressor housing 10 for the air flow path between the air inlet 11 and the air outlet 12 and between the drive shaft 30 .

The turbine 2 is constructed in a conventional manner and includes a turbine impeller 21 forming a drive for the turbine housing 20 and the drive shaft 30 and the turbine impeller is disposed within the turbine housing 20, Is disposed on the shaft (30).

A compressor volute 15 in the form of a volute housing and a diffuser passage or intermediate passage 14 are formed in the compressor housing 10 of the compressor 1. The compressor volute 15 as an air passage in the airflow path leads to the compressor impeller 40 through a radially extending intermediate passage 14 and is directed to the air outlet 12.

1 and 2, the compressor housing 10 further includes an insert part 13 which is inserted into the compressor housing 10 at the air inlet side so that the insert part 13 is connected to the compressor impeller 40 ) In the radial direction. The compressor (1) further includes an outlet guide unit (60) arranged in the diffuser passage (14) of the compressor housing (10).

In a preferred embodiment of the compressor 1, the diffuser passage 14, which extends radially in the compressor housing 10, includes a first radial wall 22 and a second radial wall 24. The first radial wall 22 of the diffuser passage 14 preferably forms a part of the compressor volute 15.

The outlet guide unit 60 is a separate bladeless type outlet guide unit disposed in the radial diffuser passage 14 and attached to the first radial wall 15 of the diffuser passage 14. Specifically, as shown in the figure, a connecting element, such as a screw, for detachably attaching a separate, bladeless-type outlet guide unit 60 to the first radial wall 22 of the diffuser passage 14 is provided .

Specifically, as shown in FIG. 2, an axial-directional restricting portion (not shown) is provided between a separate blade-less type outlet guide unit 60 and a second radial wall 24 of the diffuser passage 14, (a) is present. Here, based on the radial size of the diffuser passage 14, a separate blade-less type outlet guide unit 60 and a second radial wall 24 of the diffuser passage 14, which is axially opposed thereto, Is preferably constant at the maximum portion. In the region of the radially inner diameter of the separate blade-less type outlet guide unit 60, the inner diameter of the second blade-less outlet guide unit 60 is set so that the second And emanates from the radial wall 24 in a substantially conical shape.

A separate bladeless outflow guide unit 60 is configured as an annular disc comprising a first pipe section 32 in the region of a radially inner diameter which is coaxial with the drive shaft 30, The second radial wall 24 of the passage 14 and has a specific axial size b.

Moreover, the radially inner circumferential surface of the first pipe section 32 lies radially opposite one section of the compressor housing 10, which section is specifically defined by a section of the insert part 13 A narrow radial clearance, which is not visible in FIG. 2, is present between the one section of the insert part 13 and the radially inner circumferential surface of the first pipe section 32, but this gap is too narrow, Lt; RTI ID = 0.0 > 14 < / RTI >

Preferably, the annular disc 60 includes a second pipe section 34 that is offset from the first pipe section 32, the second pipe section is coaxial with the drive shaft 30, 2 radially wall 24 and centering the annular disc 60 at the radially inward step 36 of the compressor bolt 15. Here, the second pipe section 34 has a larger inner diameter than the first pipe section 32 in particular. The first pipe section 32 and the second pipe section 34 are formed, for example, as one part with the annular disc 60. Furthermore, the first pipe section 32 and the second pipe section 34 specifically enclose the drive shaft 30 and the compressor impeller 40.

Furthermore, the axial azimuth (a) between the separate, blade-less, outlet guide unit in the form of an annular disc 60 and the second radial wall 24 of the diffuser passage 14, which is located axially opposite thereto, Is smaller than the axial size (b) of the first pipe section (34). Thus, if a separate bladeless outlet guide unit in the form of an annular disc 60 is inadvertently dropped from the first radial wall 32 as a result of, for example, damage to the screw (s) Type outlet guide unit is brought into contact with the compressor impeller 40 to prevent the compressor 1 from causing significant damage.

The present invention can be implemented in any type of compressor 1 without the need for a combination of turbine 2 and compressor 1 for the aforementioned purposes.

1: Compressor
2: Turbine
10: compressor housing
11: Air inlet
12: Air outlet
13: insert piece
14: Diffuser passage
15: Compressor volute
20: Turbine housings
21: Turbine impeller
22: first radial wall
24: second radial wall
30: drive shaft
32: first pipe section
34: second pipe section
36: radially inward step
40: compressor impeller
41: blade
60: Outlet guide unit
a: Axial clear width
b: Axial size

Claims (11)

A compressor (1) for a turbocharger, said compressor comprising at least the following elements:
a compressor housing (10) having an air inlet (11) for receiving air to be compressed in the compressor (1) and an air outlet (12) for discharging the air compressed in the compressor (1) to the outside;
b) a drive shaft (30) extending axially and rotatably mounted within the compressor housing (10), the drive shaft being rotatably driven through a drive acting on the drive shaft;
c) a compressor impeller (40) disposed in the compressor housing (10) and on the drive shaft (30) in relation to the air flow path between the air inlet (11) and the air outlet (12);
d) a diffuser passage (14) extending radially in the compressor housing (10), the diffuser passage comprising a first radial wall (22) and a second radial wall (24);
e) a compressor volute as an air passage in the airflow path, the compressor volute leading to the compressor impeller (40) through the diffuser passage (14) and towards the air outlet (12);
f) a separate bladeless outlet guide member (12) disposed in the radial diffuser passage (14) and attached to the first radial wall (22) of the diffuser passage
/ RTI >
g) There is an axial clear width (a) between the separate blade-less outlet guide unit and the second radial wall (24) of the diffuser passage (14)
h) a separate bladeless outlet guide unit is configured as an annular disc (6) comprising a first pipe section (32) in the region of a radially inner diameter, said first pipe section comprising a drive shaft , With the second radial wall (24) of the diffuser passage (14) being back and having a specific axial dimension (b)
i) the radially inner circumferential surface of the first pipe section 32 lies radially opposed to one section 13 of the compressor housing 10,
(j) said axial azimuth (a) is smaller than said size (b) of said first pipe section (32). A compressor according to claim 1, characterized in that the first radial wall (22) of the diffuser passage (14) forms part of a compressor volute (15). 3. The apparatus of claim 2, wherein the annular disc (60) comprises a second pipe section (34) that is offset from the first pipe section (32), the second pipe section is coaxial with the drive shaft And centering the annular disc (60) at the step (36) of the compressor bolt (15). 4. The compressor of claim 3, wherein the second pipe section (34) has a larger inner diameter than the first pipe section (32). 5. Compressor according to any one of claims 1 to 4, characterized in that at least the first pipe section (32) is formed as one part with the annular disc (60). 6. A method according to any one of claims 1 to 5, wherein the radially inwardly radial portion of the first pipe section (32) is radially opposed to the insert part (13), the insert part Is inserted into the compressor housing (10) at least partly radially and surrounds the compressor inlet (40). 7. A device according to any one of claims 1 to 6, characterized in that a connecting element is provided for detachably attaching the annular disc (60) to the first radial wall (22) of the diffuser passage (14) The compressor. 8. An apparatus according to any one of the preceding claims, characterized in that an annular disc (16) and a second radial wall (24) of the diffuser passage (14) axially opposed to the annular disc Characterized in that the number of revolutions (a) is constant at least at the maximum part, based on the radial size. A turbocharger equipped with the compressor (1) according to any one of claims 1 to 8. 10. The turbine of claim 9, further comprising a turbine (2) comprising a turbine impeller (21) forming a turbine housing (20) and a drive for the drive shaft (30) Is disposed on the drive shaft (30). 11. Turbocharger according to claim 10, characterized in that the turbine housing (20) is connected to the compressor housing (10).

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