KR20090035601A - Compressor housing - Google Patents

Abstract

It is an object of the present invention to provide a compressor stage suitable for the more stringent demands on efficiency. To this end, the design of the diffuser / spiral section has been adapted. Specifically, the integration of the high stabilizer space 60 with the insertion wall and the compressor housing is provided.

Description

Compressor Housing {COMPRESSOR HOUSING}

The present invention relates to the field of exhaust gas turbochargers for turbocharged internal combustion engines. The present invention relates to a compressor of such an exhaust gas turbocharger.

Exhaust gas turbochargers are used to improve the performance of internal combustion engines, in particular reciprocating piston internal combustion engines. In this case, the exhaust gas turbocharger generally comprises a centrifugal compressor and a radial or axial turbine.

At this time, the characteristic curve-stabilization measures include a bypass in the form of an annular gap in the interior of the compressor housing, parallel to the suction channel, for example on the wheel contour of the compressor wheel at the first quarter of the wheel length. This bypass provides a radial inlet groove upstream to the compressor wheel, a radial contour groove downstream of the inlet edge of the compressor wheel, and a stabilizer area connecting the two grooves. Is formed.

Bypass mass flow occurs by the stabilizer space lying parallel to the suction channel and thus towards the original wheel unit, which bypass mass flow of the pump boundary, compared to a machine of the same construction without bypass. This allows for movement in a smaller or larger volume flow direction in the region, ie in the region of the minimum volume flow feed and in the region of the suction boundary, ie in the region of the maximum volume flow feed.

In conventional compressors, the stabilizer space is formed as a long narrow channel. This requires additional housing wall components, especially those required for large compressors, require very large and complex casting molds with many cores.

It is an object of the present invention to improve the compressor through a new design of the stabilizer space.

According to the invention, the parts inside the inner compressor housing, ie the outer helical housing, are integrally formed. The housing portion defining the flow channel downstream of the compressor wheel from the axial inlet in the region of the axial suction channel to the inside of the diffuser is formed as one part. The flow channel diverted radially from the axial direction is defined by the hub of the compressor wheel on the side facing this housing part and subsequently by the diffuser back side downstream.

A stabilizer space is arranged inside the integrally formed housing, the stabilizer space extending according to the invention over a large radial height which is variable in the axial direction. This results in an optimal vortex of the recycle flow through the stabilizer space. The stabilizer space is open towards the flow channel through two openings. A radial inlet opening is arranged upstream with respect to the compressor wheel, a radial contour groove is arranged downstream with respect to the inlet edge of the compressor wheel and in the cover area for the inlet. The annular web disposed between the peripheral openings forms part of the flow channel wall and is connected to the internal compressor housing through several holding ribs.

Optionally, the holding ribs may be provided with vibration reduction measures. For example, the holding ribs can be arranged at an angle with respect to the radial direction. Alternatively, the holding ribs may be profiled and / or disposed twisted around their axis. In order to increase the rigidity and also to realize the high natural frequency of the inlet geometry, several holding ribs can be arranged at an angle in the opposite direction.

Due to this variant, considerable cost savings for the finished part are expected. In addition, this variant makes it possible to implement a variable helical cross section for various compressor stages.

Optionally, a thermal insulation may be provided in the housing wall separating the stabilizer space from the flow channel. Due to this, the heat introduction into the air circulating in the stabilizer space can be reduced.

Optionally, soundproof means can be arranged in the stabilizer space without further structural measures.

Hereinafter, the apparatus according to the present invention will be described in more detail by schematically showing in the drawings.

1 shows a compressor housing with an integrated insertion wall.

FIG. 2 shows the oblique position in the opposite direction of the holding rib with respect to the center, without the oblique position of the reinforcing rib. FIG.

Explanation of symbols on the main parts of the drawings

10: internal compressor housing with integrated insertion wall

Annular web as an essential element of 11:10

Insertion wall contoured as an essential element of 12:10

13: contour groove

14: inlet groove

15: reinforcement rib

16: holding rib for annular web

20: external compressor housing

25: Diffuser Profile

30: axial safety element

40: compressor wheel

50: flow channel, spiral space

60: Stabilizer space

In all drawings, like-acting components are denoted by the same reference numerals.

1 is a cross section of a centrifugal compressor formed in accordance with the present invention, showing how the centrifugal compressor is used, for example, in an exhaust gas turbocharger. The outer compressor housing 20 and the inner compressor housing 10 are divided in the region of the helical housing. The outer compressor housing 20 is fixed to the rear of the compressor wheel 40 on the right side in the bearing housing (not shown). The inner compressor housing 10 includes a portion of the helical section, a housing portion forming a flow channel upstream of the helical section, an insertion wall 12 and a compressor inlet upstream of the compressor wheel 40.

In the interior of the integrally formed internal compressor housing 10 a stabilizer space 60 is arranged, which according to the invention extends over a large radial height which extends irregularly in the axial and circumferential directions. The stabilizer space 60 is open towards the flow channel through two openings. A radial inlet groove 14 is arranged upstream of the compressor wheel, which is defined by a housing portion in the suction region, for example a housing portion of a muffler or suction nozzle and a compressor inlet. A radial contour groove 13 is arranged downstream of the inlet edge of the compressor wheel 40 and in the cover area for the inlet. The annular web 11 disposed between the peripheral grooves forms a flow channel wall in the region of the compressor inlet and is connected to the internal compressor housing via several holding ribs 16. The cross section of the stabilizer space 60 is not constant along the perimeter based on the helical section. However, the average radial height of the stabilizer space is, according to the invention, at least approximately two thirds of the axial spacing between the inlet groove 14 and the contour groove 13. Thanks to the large, non-uniformly extending radial height of the stabilizer space, the vortex of the recirculation flow through the stabilizer space optimally occurs, which has a positive effect on the generated noise. In addition, non-uniform cross-sectional extensions along the perimeter ensure acoustically further improvements.

Optionally, the inner compressor housing 10 can be reinforced for some purpose by means of a reinforcing rib 15 extending in the axial direction. Due to this, by dividing the helical geometry into two housing parts, any load that may occur in the internal compressor housing can be prevented. The number of reinforcing ribs can be selected corresponding to the expected load. Optionally, the reinforcing ribs can be formed twisted around the charger axis. Optionally, the reinforcing ribs can be arranged obliquely with respect to the radial direction. Optionally, the edges of the reinforcing ribs can be formed rotationally symmetric. Optionally, the reinforcing ribs can have a conical shape.

It is necessary to fix the annular web 11 separately by separating the insertion wall geometry at the compressor inlet by the contour groove. This fixing is effected by holding ribs 16 facing radially outwards.

Optionally, vibration reduction measures can be implemented. That is, optionally, the holding ribs can be formed twisted about their axis. Optionally, the holding ribs can be erected at an angle to the radial direction. In this case, the holding ribs can have different deviations with respect to the radial direction. In particular, the holding ribs may be arranged obliquely in opposite directions. By the oblique position shown in FIG. 2 of the holding ribs 16 in the radial direction, in particular by unequal positions of the same or opposite directions, the vibration behavior can be influenced for a given purpose.

Optionally, the holding ribs can have a round, conical or elliptical profile or have a flow profile.

This type of holding rib has a small additional structural aid and allows the optimum means of reducing noise to be mounted in the stabilizer space.

The very smooth overall structure of the integrated internal compressor housing has a positive effect on the behavior when the compressor wheel ruptures. The long housing part can be deformed and absorbs most of the energy stored in the compressor wheel.

In the downstream region of the compressor wheel, an integrated housing wall 10 is optionally arranged with a guide vane profile 25 of the diffuser. The profile is provided as a rounded rim in the casting of the integrated internal compressor housing and milled to the required dimensions for finishing. In this way, the high inventory costs incurred by managing the diffuser as a separate part can be saved because for all possible compressor specifications, i.e. different blade heights or profiles, non-exchangeable parts must be maintained. Because. In addition, by integrating the diffuser profile 25 into the inner compressor housing, indentations requiring high manufacturing costs can be avoided based on strict tolerances on shape and position for the diffuser height and thickness of the diffuser plate. In particular, the number of parts of the compressor can also be reduced.

Claims (11)

A compressor having a compressor wheel with a blade lying within the compressor housing, wherein the axial inlet of the compressor wheel is disposed in the region of the axial suction channel, and within the compressor wheel is a radial inlet groove upstream to the compressor wheel. 14 is provided, the cover area is provided with a radial contour groove 13 downstream with respect to the inlet edge of the compressor wheel and with respect to the inlet thereof, and a stabilizer space 60 connecting the two grooves in the axial direction is provided. Provided, the stabilizer space is defined by an annular web 11 with respect to the suction channel, the annular web 11 forming part of the channel wall, the annular web being internal through several holding ribs 16. Compressor connected to the compressor housing. Compressor characterized in that the stabilizer space (60) between the inlet groove (14) and the contour groove (13) has a variable minimum height. The stabilizer space 60 between the inlet groove 14 and the contour groove 13 is an average of two thirds of the axial spacing between the inlet groove 14 and the contour groove 13. A compressor, characterized in that it has a minimum radial height. 3. Compressor according to claim 1 or 2, characterized in that the compressor housing (10) is integrally formed which defines the stabilizer space (60) towards the flow channel. 4. Compressor according to any one of the preceding claims, characterized in that the compressor housing defining the stabilizer space (60) towards the flow channel is provided with axially arranged reinforcing ribs (15). 5. Compressor according to any one of the preceding claims, characterized in that the compressor housing defining the stabilizer space (60) towards the flow channel is at least partially provided with thermal insulation. 6. Compressor according to any one of the preceding claims, characterized in that at least part of the holding ribs (16) are arranged radially off. 7. Compressor according to claim 6, characterized in that the holding ribs (16) are arranged radially off at least partially not equal. 8. The compressor housing according to claim 1, wherein the compressor housing defining the stabilizer space 60 towards the flow channel comprises a guide vane 25 of the diffuser integrated downstream of the compressor wheel in the region of the flow channel. Compressor, characterized in that. 9. Compressor according to any one of the preceding claims, characterized in that the stabilizer space (60) has a cross section which varies along a circumference. 10. Compressor according to any one of the preceding claims, characterized in that noise reduction means are provided in the region of the stabilizer space (60).

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