A turbocharger compressor impeller with a high performance hub and wheel cover

Abstract

The invention discloses a turbocharger compressor impeller with a high-performance hub and a wheel cover, comprising a hub (1); a plurality of pairs of blade groups are cross-distributed at equal intervals around the upper surface of the hub and around the vertical central axis of the hub in the circumferential direction; each pair of blade groups comprises a long blade (2) and a splitter blade (3) distributed at intervals; the long blade (2) and the splitter blade (3) are both blade-shaped blades; the edge of the middle arc surface of the long blade (2) close to the hub (1) is a hub curve (5); the edge of the middle arc surface of the long blade (2) away from the hub (1) is a wheel cover curve (4); the wheel cover curve and the hub curve both conform to the Bezier spline curve. The invention has a scientific structural design and can effectively prevent air backflow by controlling the shapes of the hub curve and the wheel cover curve on both sides of the middle arc surface of the blade, thereby greatly improving the efficiency of the compressor.

Description

Technical Field

[0001] The invention relates to the technical field of turbochargers, and in particular to a turbocharger compressor impeller with a high-performance hub and a wheel cover. Background Art

[0002] Turbocharging technology uses the exhaust gas from the engine to drive the turbine in the turbocharger to rotate, and drives the compressor impeller to rotate, so that the compressor impeller compresses the air and fills the compressed air into the engine. In order to make the same size engine have higher combustion efficiency, better fuel economy and higher torque characteristics, the performance of the compressor impeller must be improved.

[0003] However, the existing compressor impeller has an unreasonable structural design and poor overall performance, which seriously limits the efficiency of the compressor and further affects the efficiency of the entire turbocharger. Summary of the invention

[0004] The purpose of the present invention is to provide a turbocharger compressor impeller with a high-performance hub and a wheel cover in view of the technical defects in the prior art.

[0005] To this end, the present invention provides a turbocharger compressor impeller having a high-performance hub and a wheel cover, comprising a hub;

[0006] A plurality of pairs of blade groups are cross-distributed at equal intervals around the upper surface of the hub and around the vertical center axis of the hub in the circumferential direction;

[0007] Each pair of blade groups includes a long blade and a splitter blade that are spaced apart;

[0008] Long blades and splitter blades are both leaf-shaped blades;

[0009] The edge of the middle arc surface of the long blade close to the hub is the hub curve;

[0010] The edge of the middle arc surface of the long blade away from the hub is the wheel cover curve;

[0011] The shapes of the wheel cover curve and the wheel hub curve both conform to the shape of the Bezier spline curve.

[0012] Among them, the hub curve of the splitter blade and the wheel cover curve of the splitter blade both conform to the shape of the Bezier spline curve.

[0013] Among them, the wheel cover curve and the wheel hub curve conform to the high-order Bezier spline curve respectively;

[0014] A high-order Bezier spline curve, specifically a Bezier spline curve of degree 5 or higher.

[0015] The angle A between the air inlet edge of the long blade at the top of the long blade and the horizontal transverse straight line is in the range of 5 to 8 degrees.

[0016] Among them, the air inlet edge of the long blade at the top of the long blade gradually tilts downward from the inside to the outside.

[0017] The angle B between the outlet edge of the long blade at the bottom of the long blade and the vertical line is in the range of 12 to 18 degrees.

[0018] Among them, the outlet edge of the long blade gradually tilts upward from the inside to the outside.

[0019] Among them, the ratio of the total arc length of the splitter blade hub curve to the total arc length of the long blade hub curve is in the range of 0.4-0.5.

[0020] The angle C between the inlet edge of the splitter blade at the top of the splitter blade and the horizontal transverse straight line is in the range of 11 to 13 degrees;

[0021] The air inlet edge of the splitter blade at the top of the splitter blade gradually tilts upward from the inside to the outside.

[0022] It can be seen from the technical solution provided by the present invention that, compared with the prior art, the present invention provides a turbocharger compressor impeller with a high-performance hub and a wheel cover, which has a scientific structural design and can effectively prevent air backflow by controlling the shape of the hub curve and the wheel cover curve on both sides of the mid-arc surface of the blade, thereby greatly improving the compressor efficiency, and thus improving the efficiency of the entire turbocharger, and can effectively solve the technical deficiencies of the existing impeller. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the three-dimensional structure of a turbocharger compressor impeller with a high-performance hub and a wheel cover provided by the present invention;

[0024] Figure 2 A turbocharger compressor impeller with a high-performance hub and a wheel cover provided by the present invention has a schematic diagram of an impeller channel structure;

[0025] Figure 3 A turbocharger compressor impeller with a high-performance hub and a wheel cover provided by the present invention, and a schematic diagram of a design example of a Bezier spline control curve of the hub and the wheel cover of the impeller;

[0026] Figure 4 A turbocharger compressor impeller with a high-performance hub and a wheel cover provided by the present invention, and a schematic diagram of the inlet and outlet structure angles of the impeller;

[0027] Figure 5A turbocharger compressor impeller with a high-performance hub and a wheel cover provided by the present invention, and a schematic diagram of the position of the splitter blades of the impeller (the figure shows the position of the splitter blades and the long blades when they are superimposed together);

[0028] In the figure, 1 is the hub, 2 is the long blade, 3 is the splitter blade, 4 is the wheel cover curve, and 5 is the hub curve;

[0029] 21 is the air inlet edge of the long blade, and 22 is the outlet edge of the long blade;

[0030] 31 is the air inlet edge of the splitter blade. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and implementation modes.

[0032] See also Figures 1 to 5 As shown, the present invention provides a turbocharger compressor impeller with a high-performance hub and a wheel cover, comprising a hub 1;

[0033] Around the upper surface of the hub 1, multiple pairs of blade groups are cross-distributed at equal intervals along the circumferential direction around the vertical center axis of the hub 1;

[0034] Each pair of blade groups includes a long blade 2 and a splitter blade 3 that are spaced apart;

[0035] The long blade 2 and the splitter blade 3 are both leaf-shaped blades;

[0036] The edge of the middle arc surface (blade profile) of the long blade 2 close to the hub 1 is the hub curve 5;

[0037] The edge of the middle arc surface of the long blade 2 away from the hub 1 is the wheel cover curve 4;

[0038] The shapes of the wheel arch curve 4 and the wheel hub curve 5 both conform to the shapes of the Bezier spline curve.

[0039] It should be noted that the hub curve of the splitter blade (i.e. the edge of the splitter blade 3 close to the hub 1) and the wheel cover curve of the splitter blade (i.e. the edge of the other side of the splitter blade 3 away from the hub 1) both conform to the shape of the Bezier spline curve.

[0040] In the present invention, in a specific implementation, the wheel cover curve 4 and the wheel hub curve 5 respectively conform to high-order (5th order and above) Bezier spline curves;

[0041] In a specific implementation, the high-order Bezier spline curve may be a quintic Bezier spline curve.

[0042] It should be noted that, for the present invention, the hub curve of the impeller conforms to the high-order Bezier spline curve, which can accurately control the hub curve of the compressor impeller and control the gas flow direction of the meridional channel of the impeller. At the same time, the shape of the impeller cover curve also conforms to the high-order Bezier spline curve, so that the compressor impeller cover curve can be accurately controlled to effectively prevent gas backflow, and at the same time effectively control the spacing between the compressor impeller and the compressor casing to prevent air leakage, greatly improving the efficiency of the compressor, thereby improving the overall efficiency of the turbocharger.

[0043] In the present invention, it should be noted that the median arc line in the median arc surface of the long blade 2 is a Bezier spline curve based on a plurality of control points, for example, a quintic Bezier spline curve.

[0044] See also Figure 3 As shown, for example, for the impeller, the wheel cover Bezier spline curve, when designing, includes P1 shroud 、P2 shroud 、P3 shroud 、P4 shroud and P5 shroud The wheel hub Bezier spline curve includes P1 hub 、P2 hub 、P3 hub 、P4 hub and P5 hub Through these designs, the tangent direction of the curve starting point control point can be accurately controlled, and the curve is smooth, continuous and divisible, making it more in line with the high-order Bezier spline curve, which is conducive to accurately controlling the gas flow direction.

[0045] It should be noted that, for the present invention, the structure of the compressor impeller includes a hub, a plurality of long blades and a plurality of splitter blades, the number of long blades and splitter blades is equal, and they are evenly distributed on the hub of the impeller in an alternating manner around the axial direction of the compressor impeller.

[0046] When designing the blades of the compressor impeller, the middle camber surface of the blade is first defined (specifically, the middle camber surface obtained by the middle camber line conforming to the Bezier curve, which is specifically embodied as follows: Figure 2The side of the long blade shown in the figure), the two sides of the middle arc surface are the hub curve and the wheel cover curve, wherein the hub curve is close to the hub side, and the wheel cover curve is away from the hub side. In order to obtain higher compressor efficiency, it is necessary to strictly control the hub curve and the wheel cover curve of the compressor impeller. It should be noted that for the prior art, the hub curve and the wheel cover curve are usually processed and positioned using multiple tangent arcs, and the above two curves cannot be accurately controlled. Therefore, secondary flow in the impeller channel and air flow backflow will occur, which seriously limits the compressor efficiency.

[0047] Therefore, the present invention utilizes high-order Bezier spline curves to accurately control the shapes of the hub curve and the wheel cover curve on both sides of the mid-arc surface of the blade, effectively preventing air backflow, greatly improving the compressor efficiency, and thus improving the efficiency of the entire turbocharger, which can effectively solve the technical deficiencies of existing impellers.

[0048] In the present invention, the specific implementation is as follows: Figure 4 As shown, the angle A between the long blade air inlet edge 21 at the top of the long blade 2 and the horizontal transverse straight line is in the range of 5 degrees to 8 degrees.

[0049] In a specific implementation, the long blade air inlet edge 21 at the top of the long blade 2 gradually slopes downward from the inside to the outside (ie, the closer to the vertical center axis of the profile, the higher the height).

[0050] Therefore, based on the above angle and shape design, the problem of uneven radial airflow distribution at the impeller inlet can be solved, and at the same time, the natural frequency of the impeller blades is improved.

[0051] In the present invention, the specific implementation is as follows: Figure 4 As shown, the angle B between the long blade outlet edge 22 at the lower part of the long blade 2 and the vertical straight line is in the range of 12 degrees to 18 degrees;

[0052] In a specific implementation, the long blade outlet edge 22 gradually tilts upward from the inside to the outside (ie, the closer to the vertical center axis of the profile, the lower the height).

[0053] Therefore, based on the above angle and shape design, the airflow flow channel on the wheel cover side can be extended, the airflow diffusion distance can be increased, the aerodynamic load on the blades can be reduced, the impeller efficiency and pressure ratio can be improved, and at the same time, the uniformity of the impeller outlet airflow can be improved, and the efficiency of the impeller can be improved.

[0054] In the present invention, in a specific implementation, the ratio of the total arc length of the splitter blade hub curve to the total arc length of the long blade hub curve is in the range of 0.4-0.5. By selecting the position of the splitter blade, the impeller blade load can be reduced in the outlet section, the impeller outlet expansion pressure is stable, and the pressure ratio is improved stably.

[0055] like Figure 5 As shown, for the splitter blade of the impeller, its shape conforms to the Bezier spline curve, and the Bezier spline curve includes the wheel cover curve control point P shroud And the wheel curve control point P hub , wherein the ratio between the arc length L1 of the arc-shaped hub edge on the side of the splitter blade 3 close to the hub 1 (i.e. the total arc length of the splitter blade hub curve) and the arc length L2 of the hub curve edge 5 of the long blade 2 (i.e. the total arc length of the long blade hub curve) is in the range of 0.4 to 0.5.

[0056] In the present invention, the specific implementation is as follows: Figure 4 As shown, the angle C between the splitter blade inlet edge 31 at the top of the splitter blade 3 and the horizontal transverse straight line is in the range of 11 to 13 degrees;

[0057] The splitter blade inlet edge 31 at the top of the splitter blade 3 gradually tilts upward from the inside to the outside (ie, the closer to the vertical center axis of the profile, the lower the height).

[0058] Therefore, based on the above angle and shape design, the root strength of the splitter blade 3 can be guaranteed, and better aerodynamic performance of the blade can be obtained, while avoiding problems such as stress concentration and blade breakage caused by excessive centrifugal force.

[0059] It should be noted that in Figure 2 , Figure 4 In the figure, the long blade outlet edge 22 at the bottom of the long blade 2 and the diverter blade outlet edge at the bottom of the diverter blade 3 overlap each other. In specific implementation, the angles between the long blade outlet edge 22 at the bottom of the long blade 2 and the diverter blade outlet edge at the bottom of the diverter blade 3 and the vertical line can be equal.

[0060] To sum up, compared with the prior art, the turbocharger compressor impeller with a high-performance hub and a wheel cover provided by the present invention has a scientific structural design and can effectively prevent air backflow by controlling the shape of the hub curve edge and the wheel cover curve edge on both sides of the mid-arc surface of the blade, thereby greatly improving the compressor efficiency, and thus improving the efficiency of the entire turbocharger, and can effectively solve the technical deficiencies of existing impellers.

[0061] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A turbocharger compressor impeller having a high-performance hub and a wheel cover, characterized in that: comprising a wheel hub (1); A plurality of pairs of blade groups are cross-distributed at equal intervals along the circumferential direction around the upper surface of the hub (1) and around the vertical central axis of the hub (1); Each pair of blade groups includes a long blade (2) and a splitter blade (3) that are spaced apart from each other; The long blade (2) and the splitter blade (3) are both leaf-shaped blades; The edge of the middle arc surface of the long blade (2) close to the hub (1) is a hub curve (5); The other side edge of the mid-arc surface of the long blade (2) away from the hub (1) is a wheel cover curve (4); The hub curve of the splitter blade and the wheel cover curve of the splitter blade both conform to the Bezier spline curve; The shapes of the wheel cover curve (4) of the long blade and the wheel hub curve (5) of the long blade are shapes that conform to high-order Bezier spline curves; Higher-order Bezier spline curves, specifically Bezier spline curves of degree 5 or higher; The angle between the long blade air inlet edge (21) at the top of the long blade (2) and the horizontal transverse straight line is in the range of 5 degrees to 8 degrees; The long blade air inlet edge (21) at the top of the long blade (2) is gradually inclined downward from the inside to the outside; The angle B between the long blade outlet edge (22) at the lower part of the long blade (2) and the vertical line is in the range of 12 degrees to 18 degrees; The long blade outlet edge (22) is gradually inclined upward from the inside to the outside; The angle between the splitter blade inlet edge (31) at the top of the splitter blade (3) and the horizontal transverse straight line is in the range of 11 to 13 degrees; The splitter blade inlet edge (31) at the top of the splitter blade (3) gradually tilts upward from the inside to the outside.

2. The turbocharger compressor impeller with a high-performance hub and a wheel cover according to claim 1, characterized in that: The ratio of the total arc length of the splitter blade hub curve to the total arc length of the long blade hub curve is in the range of 0.4-0.5.

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