Compressor wheel of a radial compressor of an exhaust-gas turbocharger

Abstract

A compressor wheel (1) of a radial compressor (2) of an exhaust-gas turbocharger (3), having a hub (8); and having two blade rows (9, 10) which are arranged adjacent to one another on the hub (8), a first blade row (9) forming the leading blade row, and the adjacent, second blade row (10) forming the trailing blade row, wherein the number of blades (11) of the first blade row (9) is equal to the number of blades (12) of the second blade row (10).

Claims

1. An exhaust-gas turbocharger (3) having a radial compressor (2) including a compressor wheel (1) having a hub (8); and two blade rows (9, 10) arranged on the hub (8) including an inducer blade row (9) comprising a plurality of inducer blades and an exit blade row (10) comprising a plurality of exit blades, the blade rows cooperating for inducting air in axially, accelerating it centrifugally, and discharging air radially outward, wherein the number of inducer blades (11) of the inducer blade row (9) is equal to the number of exit blades (12) of the exit blade row (10), each inducer blade (11) cooperating with an exit blade (12) to form a blade pair, wherein each inducer blade (11) of the blade pair and each exit blade (12) of the blade pair has a leading edge (13, 14), a trailing edge (15, 16), a pressure side and a suction side, wherein a spacing (D) is provided between the trailing edge (15) of the inducer blade (11) of the blade pair and the leading edge (14) of the exit blade (12) of the blade pair as viewed in the inflow direction (A), and the exit blade (12) of the blade pair is advanced in the direction of rotation relative to the inducer blade (11) of the blade pair, and wherein all air flowing through said spacing (D) flows from the pressure side of the inducer blades to the suction side of the exit blades.

2. The exhaust-gas turbocharger as claimed in claim 1, wherein at least one splitter blade is provided.

Description

(1) Further details, advantages and features of the present invention become apparent from the following description of an exemplary embodiment with reference to the drawing, in which:

(2) FIG. 1 is a schematically highly simplified diagrammatic illustration of an exhaust-gas turbocharger that can be provided with a compressor wheel according to the invention, and

(3) FIG. 2 shows a perspective view of an embodiment of a compressor wheel according to the invention.

(4) FIG. 1 is a schematically highly simplified diagrammatic illustration of an exhaust-gas turbocharger 3 that can be provided with a compressor wheel 1 according to the invention, which compressor wheel will be explained in detail below on the basis of FIG. 2.

(5) As is conventional, the exhaust-gas turbocharger 3 has a compressor 2 with the compressor wheel 1 and has a turbine 4 with a turbine wheel 5. As is conventional, said parts are arranged in a compressor housing and a turbine housing respectively, which are connected via a bearing housing 6 which serves for the mounting of a shaft for the compressor wheel 1 and the turbine wheel 5. The exhaust-gas turbocharger 3 self-evidently also has all the other conventional components of such superchargers, the explanation of which is however not necessary for the description of the principles of the present invention.

(6) FIG. 2 shows a perspective illustration of an embodiment of the compressor wheel 1 according to the invention. The compressor wheel 1 has a hub 8 on which, according to the invention, there are arranged two blade rows 9 and 10.

(7) As viewed in the inflow direction A of the air that is inducted by the compressor 1 and to be compressed, the first blade row 9 is an inflow blade row (also referred to as pre-rotor blade row or inducer row), whereas the second blade row 10, arranged adjacent to the first blade row 9, forms an exit blade row, also referred to as impeller row.

(8) As shown in FIG. 2, the two blade rows 9 and 10 are two separate units which are both arranged on the same hub 8.

(9) Here, the number of blades 11 of the first blade row 9 is equal to the number of blades 12 of the second blade row 10, wherein in each case one of the blades of the first blade row 9 and one of the blades of the second blade row 10 is denoted by the said reference sign 11 and 12 respectively.

(10) Each of the blades 11 has a leading edge 13 and a trailing edge 15.

(11) Accordingly, each of the blades 12 of the second blade row 10 also has a leading edge 14 and a trailing edge 16.

(12) In the embodiment illustrated in FIG. 2, a spacing D is provided between the trailing edges 15 of the blades 11 and the leading edges 14 of the blades 12.

(13) According to the invention, however, it is also possible for the trailing edges 15 and the leading edges 14 of the first blade row 9 and of the second blade row 10, respectively, to overlap.

(14) Although not illustrated in FIG. 2, it is also possible for the compressor wheel 1 according to the invention to be provided with at least one splitter blade.

(15) According to the invention, the angled orientation of the blades 11 and 12 relative to the hub, or relative to the longitudinal axis thereof, may be varied in accordance with the application. Furthermore, the angled orientation of the leading edges of the blades 11 of the first blade row 9 with respect to the trailing edges 16 of the blades 12 of the second blade row 10 may likewise be varied.

(16) In addition to the above written description of the invention, reference is hereby explicitly made, for additional disclosure thereof, to the diagrammatic illustration in FIGS. 1 and 2.

LIST OF REFERENCE SIGNS

(17) 1 Compressor wheel 2 Radial compressor 3 Exhaust-gas turbocharger 4 Turbine 5 Turbine wheel 6 Bearing housing 7 Shaft 8 Hub 9, 10 First and second blade row 11 Blades of the first blade row 12 Blades of the second blade row 13, 14 Leading edges 15, 16 Trailing edges A Inflow direction of the inducted air D Spacing