CN204312393U - With the turbosupercharger of gas compressor arc diagonal impeller - Google Patents

Abstract

A turbocharger with an arc-shaped oblique flow impeller of a compressor, including a turbine case, a bearing body, a compressor pressure casing, a rotor shaft, a turbine rotor, a thrust vane, an arc-shaped oblique flow impeller of a compressor, a thrust bearing, Sealing sleeve, heat shield, oil seal cap, sealing ring. The turbine box is connected with the bearing body through the collar sleeve, the heat shield is installed between the turbine box and the end plane of the bearing body, the turbine rotor is fixedly installed at one end of the rotor shaft, and the rotor shaft is installed on the inner ring of the sliding bearing on the bearing body, and the The push piece, sealing sleeve and arc-shaped oblique flow impeller of the compressor are installed on the other end of the rotor shaft in turn, and are fixed on the rotor shaft by nuts, and the thrust bearing is installed on the outer circle of the sealing sleeve, and fixed on the bearing body by screws On the top, the pressure end seal ring is installed on the circular boss of the seal sleeve, the oil seal cover is set on the seal sleeve and fixed in the bearing body, and the compressor pressure shell is connected with the bearing body through screws and pressure plates.

Description

Turbocharger with curved compressor impeller

technical field

The utility model relates to the technical field of turbochargers, in particular to a method of reducing the axial load of a compressor impeller by adopting an arc-shaped oblique flow impeller and improving the ease of installation on the inlet rim side of a bladeless diffuser under a small flow rate of the supercharger. A turbocharger that generates backflow.

Background technique

The turbocharger uses the exhaust of the engine to drive the turbine, and the rotation of the turbine drives the coaxial compressor to work. The compressor compresses the fresh air entering the engine, thereby increasing the intake air volume of the engine, increasing the power of the engine, and reducing the power consumption of the engine. fuel consumption.

Existing turbocharger as shown in accompanying drawing 1, comprises turbine box 1, bearing body 2, compressor pressure shell 3, rotor shaft 4, turbine rotor 5, thrust vane 6, compressor impeller 7, thrust bearing 8. Sealing sleeve 9, heat shield 10, oil sealing cap 11, sealing ring 12.

The turbine box 1 is connected to the bearing body 2 through a collar sleeve, the heat shield 10 is installed between the end plane of the turbine box 1 and the bearing body 2, the turbine rotor 5 is fixedly installed on one end of the rotor shaft 4, and the rotor shaft 4 is installed on the bearing body The inner ring of the sliding bearing on 2, the thrust plate 6, the sealing sleeve 9 and the compressor impeller 7 are installed on the other end of the rotor shaft 4 in sequence, and are fixed on the rotor shaft 4 by nuts, and the thrust bearing 8 is installed on the sealing sleeve 9 and fixed on the bearing body 2 by screws, the pressure end sealing ring 12 is installed on the round boss of the sealing sleeve 9, the oil sealing cover 11 is set on the sealing sleeve 9 and fixed in the bearing body 2, and the compressed air The machine pressure shell 3 is connected with the bearing body 2 through screws and pressure plates.

The radial flow impeller 7 that existing turbocharger adopts is as shown in accompanying drawing 3, 4, comprises wheel hub 7-1, plural long blades 7-2 and plural short blades 7-3, long blades 7-2 and short The number of blades 7-3 is the same, long blades 7-2 and short blades 7-3 are evenly distributed on the hub 7-1 in a staggered shape, long blades 7-2 air outlet top 7-2-1 and short blades 7- 3 The air outlet top 7-3-1 is parallel to the hub 7-1's axle center line, the outer circle profile diameter of the long blade 7-2 air outlet top 7-2-1 and the short blade 7-3 air outlet top 7-3 The diameter of the outer circle of -1 is the same as the diameter of the disc of hub 1, both being D1.

With the development of turbochargers towards high speed and high pressure ratio, the entire turbocharger bearing system is under severe test, and the pressure ratio of the compressor increases, resulting in the axial load from the turbocharger end to the pressure end Increase, the axial load of the impeller mainly refers to the pressure P1 of the compressor inlet on the front of the impeller and the pressure P2 in the back clearance of the impeller. The pressure P2 in the back clearance of the compressor wheel is higher than the inlet pressure P1 when the supercharger is in normal operation. , when the axial load generated by the pressure P2 in the back clearance of the impeller is too large, the oil film between the thrust bearing 8 and the thrust plate 6 is not enough to bear the axial load, resulting in aggravated dry friction between parts. Under the action, the thrust bearing 8 wears out quickly, and when it is serious, the impeller blades will rub against the compressor casing to damage the supercharger.

Furthermore, the traditional radial flow impeller tends to generate backflow at the inlet rim side of the vaneless diffuser under the low flow rate of the supercharger.

In the field of turbocharger industry, in order to overcome the increase of axial load, we mainly start from two aspects. One is to increase the bearing capacity of the oil film by designing a new thrust bearing surface structure, so that the axial load that the thrust bearing can bear As the load value increases, this solution cannot reduce the axial load on the back of the compressor impeller. When the axial load on the back of the impeller is too large, the turbine rotor system and the thrust bearing will still have direct contact and dry wear The second is to achieve the purpose of indirectly reducing the axial load by increasing the A/R value of the turbine box flow channel, but the resulting problem is that after increasing the turbine box flow channel, the low-speed performance of the engine will be greatly affected. Contrary to current engines' emphasis on low-speed performance.

Contents of the invention

The purpose of this utility model is to overcome the above-mentioned deficiencies of the prior art and provide a turbocharger with an arc-shaped oblique flow impeller of the compressor. Axial load to prevent supercharger failure caused by the failure of the thrust bearing of the supercharger; the second is to adopt an arc-shaped oblique flow outlet at the outlet of the blade, and use the arc-shaped oblique flow outlet to improve the impeller flange curvature caused by too much The distribution of the flow field in the span direction of the impeller outlet is uneven, and the design parameter level of the impeller can be adjusted by adjusting the arc diameter of the edge of the blade outlet, so as to improve the working efficiency of the compressor.

The technical scheme of the utility model is: a turbocharger with arc-shaped oblique flow impeller of the compressor, including a turbine box, a bearing body, a compressor casing, a rotor shaft, a turbine rotor, a thrust plate, a compressor impeller, Thrust bearings, sealing sleeves, heat shields, oil seal covers, sealing rings.

The turbine box is connected with the bearing body through a collar sleeve, the heat shield is installed between the turbine box and the end plane of the bearing body, the turbine rotor is fixedly installed at one end of the rotor shaft, and the rotor shaft is installed on the inner ring of the sliding bearing on the bearing body, and the The push piece, sealing sleeve and compressor impeller are installed on the other end of the rotor shaft in sequence, and are fixed on the rotor shaft by nuts. The thrust bearing is installed on the outer circle of the sealing sleeve, and is fixed on the bearing body by screws. The pressure end The sealing ring is installed on the circular boss of the sealing sleeve, the oil sealing cover is set on the sealing sleeve and fixed in the bearing body, and the compressor pressure casing is connected with the bearing body through screws and pressure plates.

The compressor impeller adopts an arc oblique flow impeller, and the arc oblique flow impeller includes a hub, four to six long blades and four to six short blades, the number of the long blades and the short blades is the same, and the long blades and the short blades are Staggered and evenly distributed on the hub, the top of the air outlet of the long blade and the top of the air outlet of the short blade are arc-shaped structures, the arc-shaped hypotenuse at the top of the arc-shaped outlet of the long blade and the arc at the top of the arc-shaped oblique outlet of the short blade The diameter of the outer circle of the blade tip of the oblique edge is D1, the diameter of the outer circle of the blade root is D2, the diameter of the outer circle of the blade root of the arc-shaped hypotenuse at the top of the arc-shaped outlet of the long blade and the arc-shaped oblique outlet of the short blade is D2. Smaller than D1, the outer circle profile of the arc-shaped hypotenuse blade root is consistent with the outer circle diameter of the wheel hub.

When the turbocharger is in normal operation, the axial load F acting on the impeller is mainly determined by the front pressure P1 of the compressor inlet impeller, the pressure P2 in the back gap of the impeller wheel and the contact area between the gas and the impeller, F=F2-F1, F1 P1 is the axial load acting on the front surface of the impeller, F2 is the axial load acting on the back of the impeller wheel by P2, and the pressure P2 in the back clearance of the impeller wheel of the compressor is higher than the inlet pressure P1 when the supercharger is in normal operation. After the area of the back of the impeller decreases, the force-receiving area also decreases, and the decrease of the load F2 acting on the back surface of the impeller will be greater than the decrease of the axial load F1 acting on the front surface of the impeller. The load in the front direction of the impeller is reduced. As the speed increases, the axial load F on the oblique flow impeller decreases more obviously, which reduces the load on the thrust bearing and effectively improves the operation of the turbocharger.

Furthermore, the arc-shaped oblique flow outlet is used at the outlet of the blade, and the arc-shaped oblique flow outlet is used to improve the uneven distribution of the flow field in the span direction of the impeller outlet caused by the excessive curvature of the impeller rim, and can adjust the circle of the edge of the blade outlet. The arc diameter is used to adjust the design parameter level of the impeller to improve the working efficiency of the compressor.

Compared with the prior art, the utility model has the following characteristics:

1. On the existing radial flow impeller supercharger, change the impeller structure, reduce the outer circle radius of the impeller wheel back, and reduce the surface load F2 of the impeller wheel back by reducing the force-bearing surface, so as to realize the reduction of the rotor system. The axial load avoids the reduction of the life of the thrust bearing due to the large axial load, and improves the overall reliability of the supercharger.

2. Use the arc-shaped oblique flow outlet to improve the uneven distribution of the flow field in the span direction of the impeller outlet caused by the excessive curvature of the impeller rim, and adjust the design parameter level of the impeller by adjusting the arc diameter of the edge of the blade outlet to improve Compressor efficiency.

The detailed structure of the present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

Description of drawings

Accompanying drawing 1 is the structural representation of existing turbocharger;

Accompanying drawing 2 is the enlarged view of part I in accompanying drawing 1;

Accompanying drawing 3 is the structural representation of existing radial flow impeller;

Accompanying drawing 4 is A-A sectional view among accompanying drawing 3;

Accompanying drawing 5 is the structural representation of the turbocharger with arc-shaped oblique flow impeller of the compressor;

Accompanying drawing 6 is the structural representation of arc-shaped oblique flow impeller;

Accompanying drawing 7 is B-B sectional view among accompanying drawing 6;

Accompanying drawing 8 is II part enlarged view among 7.

Detailed ways

A turbocharger with an arc-shaped oblique flow impeller of a compressor, comprising a turbine case 1, a bearing body 2, a compressor casing 3, a rotor shaft 4, a turbine rotor 5, a thrust plate 6, a compressor impeller 13, a Push bearing 8, sealing sleeve 9, heat shield 10, oil sealing cap 11, sealing ring 12.

The turbine box 1 is connected to the bearing body 2 through a collar sleeve, the heat shield 10 is installed between the end plane of the turbine box 1 and the bearing body 2, the turbine rotor 5 is fixedly installed on one end of the rotor shaft 4, and the rotor shaft 4 is installed on the bearing body The inner ring of the sliding bearing on 2, the thrust plate 6, the sealing sleeve 9 and the compressor impeller 13 are installed on the other end of the rotor shaft 4 in sequence, and are fixed on the rotor shaft 4 by nuts, and the thrust bearing 8 is installed on the sealing sleeve 9 and fixed on the bearing body 2 by screws, the pressure end sealing ring 12 is installed on the round boss of the sealing sleeve 9, the oil sealing cover 11 is set on the sealing sleeve 9 and fixed in the bearing body 2, and the compressed air The machine pressure shell 3 is connected with the bearing body 2 through screws and pressure plates.

The compressor impeller adopts an arc oblique flow impeller, and the arc oblique flow impeller 13 includes a hub 13-1, five long blades 13-2 and five short blades 13-3, and the long blades 13-2 and short blades 13 -3 are evenly distributed on the hub 13-1 in a staggered shape, the top of the air outlet of the long blade 13-2 and the top of the air outlet of the short blade 13-3 are arc-shaped structures, and the top of the arc-shaped outlet of the long blade 13-2 The diameter of the blade tip outer circle of the arc-shaped hypotenuse 13-2-1 and the arc-shaped oblique flow outlet of the short blade 13-3 at the top of the arc-shaped oblique edge 13-3-1 is D1, and the arc-shaped outlet of the long blade 13-2 The arc-shaped hypotenuse 13-2-1 at the top and the arc-shaped hypotenuse 13-3-1 at the top of the short blade 13-3 arc-shaped oblique flow outlet have a root diameter of D2, and D2 is less than D1. The contour of the outer circle at the root of the side blade is consistent with the diameter of the outer circle of the wheel hub 13-1.

Claims (1)

1. the turbosupercharger with gas compressor arc diagonal impeller, comprises turbine box, bearing support, gas compressor pressure shell, rotor shaft, turbine rotor, thrust plate, compressor impeller, thrust bearing, stuffing box gland, thermal shield, oil sealing cap, seal ring;

Turbine box is connected with bearing support by collar cover, thermal shield is arranged between turbine box and the Transverse plane of bearing support, turbine rotor is fixedly mounted on one end of rotor shaft, rotor shaft is arranged on the sliding bearing inner ring on bearing support, thrust plate, stuffing box gland and gas compressor arc diagonal impeller are arranged on the other end of rotor shaft successively, and be fixed on rotor shaft by nut, thrust bearing is arranged on the cylindrical of stuffing box gland, and be fixed by screws on bearing support, pressure side seal ring is arranged on the circular bosses of stuffing box gland, oil sealing cap to be sleeved on stuffing box gland and to be fixed in bearing support, gas compressor pressure shell is connected with bearing support with pressing plate by screw,

It is characterized in that: described compressor impeller adopts arc diagonal impeller, arc diagonal impeller comprises wheel hub, four ~ six linear leafs and four ~ six short blades, linear leaf is the same with the quantity of short blade, linear leaf and cross-shaped being evenly distributed on of short blade are drawn together on wheel hub, the flow outlet top of linear leaf and the flow outlet top of short blade are arcuate structure, the blade tip excircle configuration diameter of the arc hypotenuse at the arc hypotenuse at linear leaf arc outflow opening top and short blade arc oblique flow outlet top is D1, the blade root excircle configuration diameter of the arc hypotenuse at the arc hypotenuse at linear leaf arc outflow opening top and short blade arc oblique flow outlet top is D2, D2 is less than D1, the excircle configuration at arc hypotenuse blade root position is consistent with the wheel disc outside diameter of wheel hub.