CN201865750U

CN201865750U - Turbocharger for gasoline engine

Info

Publication number: CN201865750U
Application number: CN2010206275698U
Authority: CN
Inventors: 王洪斌; 邓力红; 李曼利; 王越萍
Original assignee: Shenyang Liming Aero Engine Group Co Ltd
Current assignee: Shenyang Liming Aero Engine Group Co Ltd
Priority date: 2010-11-27
Filing date: 2010-11-27
Publication date: 2011-06-15
Anticipated expiration: 2020-11-27

Abstract

The utility model provides a turbocharger for a gasoline engine, comprising a turbine shell, a middle body rotor assembly, an air compressor casing (31) and a heat-insulating cover (41), wherein a middle body bearing support (11) is connected with a rotor shaft (3) by a floating bearing A(14), a positioning sleeve (15) and a floating bearing B(16); the positioning sleeve (15) is arranged between the floating bearing A(14) and the floating bearing B(16), and is in clearance fit with the rotor shaft (3), the floating bearing A(14), the floating bearing B(16) and the middle body bearing support (11). By adopting the structure, the problems such as shaft grinding, oil leakage at an air compressor end and an turbine end within short time, can be solved; the turbine shell is made of high-nickel spheroidal cast iron material, thus solving the problem that the turbine shell deforms or cracks under the high-temperature environment; and therefore, the turbocharger can be widely applied to the gasoline engines of saloon cars, pickup trucks, light trucks, passenger cars and the like.

Description

A kind of petrol engine turbosupercharger

Technical field

The utility model relates to a kind of turbosupercharger, particularly a kind of petrol engine turbosupercharger.

Background technique

The petrol engine turbosupercharger has the advantage that volume is little, efficient is high, pressure ratio is big, range of flow is wide, can make petrol engine reduce fuel consumption rate, hoisting power, increase low speed torque, reduce disposal of pollutants and reduce noise, but do power with the waste gas that motor is discharged because be, therefore the operating ambient temperature height of pressurized machine reaches 850 ° more than the C.Existing petrol engine turbosupercharger reaches 850 ° of C in operating temperature, and continuous firing was above 200 hours, distortion or seminess can appear in its turbine case, and when its rotor assembly rotating speed reaches 180000r/min, will produce phenomenons such as grinding axle, gas compressor end and turbine end leakage of oil in short time, make the turbosupercharger cisco unity malfunction.

Summary of the invention

Deficiency at above-mentioned prior art existence, the utility model provides a kind of petrol engine turbosupercharger, this turbosupercharger can reach 900 ° of C in operating temperature, and continuous firing was above 600 hours, distortion or crackle can not appear in its turbine case, and rated speed can reach 180000r/min, and maximum speed reaches 210000r/min.

Petrol engine turbosupercharger of the present utility model comprises turbine case, intermediate rotor assembly, compressor casing and thermal shield, turbine case is connected by the clip fastening means with the intermediate rotor assembly, the intermediate rotor assembly compresses mode with compressor casing by pressing plate and is connected, and is equipped with thermal shield between intermediate rotor assembly and the turbine case;

Described intermediate rotor assembly comprises intermediate bearings, rotor assembly, piston ring A, back-up ring A, floating bearing A, setting sleeve, floating bearing B, back-up ring B, thrust pad, thrust shaft rim, thrust plate, thrust sleeve, piston ring B and end cap;

Described rotor assembly is made up of turbine, rotor shaft and compressor impeller, and described turbine and rotor shaft, compressor impeller and rotor shaft are and are rigidly connected;

The shafting structure of described rotor shaft is turbine, piston ring A, back-up ring A, floating bearing A, setting sleeve, floating bearing B, back-up ring B, thrust pad, thrust shaft rim, thrust plate, thrust sleeve, piston ring B, end cap and compressor impeller in proper order;

Be connected by floating bearing A, setting sleeve, floating bearing B between described intermediate bearings and the rotor shaft, be Spielpassung between described rotor shaft and floating bearing A, setting sleeve, the floating bearing B, be Spielpassung between described setting sleeve and intermediate bearings, floating bearing A, the floating bearing B;

Be provided with separate lubricating oil chamber, cooling chamber in the described intermediate bearings, described lubricating oil chamber is provided with filler opening and oil outlet, and described cooling chamber is provided with water intake and water outlet;

Petrol engine turbosupercharger of the present utility model is equipped with by-pass collar, and described by-pass collar comprises bypass valve and valve connecting rod;

Described turbine case is made with the ductile Ni-resist cast iron that contains Ni 32%～36%.

Petrol engine turbosupercharger of the present utility model is compared with existing turbosupercharger, the axial limiting of floating bearing in the intermediate bearings, adopt between the two bearings inboard setting sleeve is set, the structure of arranged outside back-up ring, when the floating bearing high speed rotating, setting sleeve is and then rotation simultaneously also, therefore reduced the friction between floating bearing and the setting sleeve, the wearing and tearing between the two have also just been reduced, thereby avoided occurring grinding axle, phenomenons such as leakage of oil of gas compressor end and turbine end leakage of oil, this axial limiting structure of floating bearing can make rotor assembly proper functioning under the ultra high speed situation, rated point changes scooter 180000r/min, and maximum speed reaches 210000r/min; And the axial limiting of the floating bearing in the existing turbosupercharger case of center bearing is to adopt in the bearing both sides to use piston ring spacing, piston ring is in the groove that is fixed in the case of center bearing, piston ring is static, floating bearing is relatively large with the friction meeting of static piston ring in high speed rotating, when the rotor assembly rotating speed reached 180000r/min, phenomenons such as axle, the leakage of oil of gas compressor end and turbine end leakage of oil will appear grinding at short notice; In addition, because the material of turbine case of the present utility model is to adopt the ductile Ni-resist cast iron that contains Ni32%～36%, compare with common ductile cast iron material, can reach 900 ° of C in operating temperature, and continuous firing surpasses 600 hours, and distortion or crackle can not appear in its turbine case.

Description of drawings

Fig. 1 is a petrol engine supercharger internal structure schematic representation of the present utility model

2 turbines, 3 rotor shafts among the figure

11 intermediate bearings, 12 piston ring A, 13 back-up ring A, 14 floating bearing A, 15 setting sleeves, 16 floating bearing B

17 back-up ring B, 18 thrust pads, 19 thrust shaft rims, 20 thrust plates, 21 thrust sleeves, 22 piston ring B, 23 end caps

31 compressor casings, 32 compressor impellers

41 thermal shields.

Embodiment

Below in conjunction with accompanying drawing the utility model is done and to be described in further detail:

Petrol engine turbosupercharger of the present utility model comprises turbine case, intermediate rotor assembly, compressor casing 31 and thermal shield 41, described turbine case is connected by the clip fastening means with the intermediate rotor assembly, described intermediate rotor assembly compresses mode with compressor casing 31 by pressing plate and is connected, and is equipped with thermal shield 41 between described intermediate rotor assembly and the turbine case;

Described intermediate rotor assembly comprises intermediate bearings 11, rotor assembly, piston ring A12, back-up ring A13, floating bearing A14, setting sleeve 15, floating bearing B16, back-up ring B17, thrust pad 18, thrust shaft rim 19, thrust plate 20, thrust sleeve 21, piston ring B22 and end cap 23;

Described rotor assembly is made up of turbine 2, rotor shaft 3 and compressor impeller 32, and described turbine 2 is with rotor shaft 3 with rotor shaft 3, compressor impeller 32 and is rigidly connected;

The shafting structure of described rotor shaft is turbine 2, piston ring A12, back-up ring A13, floating bearing A14, setting sleeve 15, floating bearing B16, back-up ring B17, thrust pad 18, thrust shaft rim 19, thrust plate 20, thrust sleeve 21, piston ring B22, end cap 23 and compressor impeller 32 in proper order;

Be connected by floating bearing A14, setting sleeve 15, floating bearing B16 between described intermediate bearings 11 and the rotor shaft 3, be Spielpassung between described rotor shaft 3 and floating bearing A14, setting sleeve 15, the floating bearing B16, be Spielpassung between described setting sleeve 15 and intermediate bearings 11, floating bearing A14, the floating bearing B16.

Described turbine case is made with the ductile Ni-resist cast iron that contains Ni 36%.

Petrol engine turbocharger operation process of the present utility model is as follows:

The waste gas that discharge from enmgine exhaust petrol engine cylinder combustion acting back enters in the turbine case cavity, promote turbine 2 rotations, thereby driving coaxial compressor impeller 32 together rotates, make the air at compressor air inlet machine mouth place produce negative pressure, thereby make a large amount of outside airs suck gas compressor from the compressor air inlet machine mouth, under the effect of compressor impeller 32, the air that enters gas compressor is compressed, air after the compression enters cylinder from the gas compressor air outlet by engine intake manifold, air after the compression is fully burnt with gasoline in cylinder, finally reach the reduction fuel consumption rate, hoisting power, increase low speed torque, reduce disposal of pollutants and reduce the purpose of noise.

Petrol engine turbosupercharger of the present utility model is equipped with by-pass collar, at the air that enters gas compressor after compression, after its pressure reaches the rating value of bypass valve, bypass valve is opened, the bypass valve rod drives the valve connecting rod and rotates, thereby the by-pass port of turbine end is opened, thereby it is excessive and prevent that the hypervelocity phenomenon of rotor assembly from taking place to have controlled the suction pressure of cylinder.

Lubricant oil is to enter gap between gap between rotor assembly and floating bearing A14, setting sleeve 15, the floating bearing B16 and intermediate bearings 11 and floating bearing A14, setting sleeve 15, the floating bearing B16 by the lubricating oil chamber, and form the thin oil film of one deck, play effect lubricated and cooling.

Cooling water flows into from the water intake of cooling chamber, from the water outlet outflow of cooling water chamber, plays the effect that reduces intermediate rotor assembly temperature.

Claims

1. petrol engine turbosupercharger, comprise turbine case, the intermediate rotor assembly, compressor casing (31) and thermal shield (41), described intermediate rotor assembly comprises intermediate bearings (11), rotor assembly, piston ring A(12), back-up ring A(13), floating bearing A(14), floating bearing B(16), back-up ring B(17), thrust pad (18), thrust shaft rim (19), thrust plate (20), thrust sleeve (21), piston ring B(22) and end cap (23), described rotor assembly is by turbine (2), rotor shaft (3) and compressor impeller (32) are formed, described turbine (2) and rotor shaft (3), compressor impeller (32) is with rotor shaft (3) and is rigidly connected, described rotor shaft (3) and floating bearing A(14), floating bearing B(16) is Spielpassung between, it is characterized in that: described intermediate rotor assembly also comprises setting sleeve (15), described setting sleeve (15) is enclosed within on the rotor shaft (3), and be positioned between floating bearing A (14) and the floating bearing B (16) described setting sleeve (15) and rotor shaft (3), floating bearing A (14), floating bearing B (16), the intermediate bearings is Spielpassung between (11).

2. petrol engine turbosupercharger as claimed in claim 1 ,It is characterized in that: described turbine case is to make with the ductile Ni-resist cast iron that contains Ni 32%～36%.