Exhaust-driven turbo-charger central rotor device

Abstract

The invention discloses a core rotor device of an exhaust gas turbocharger, which comprises an intermediate shell, a thrust sleeve, a thrust bearing, an oil baffle, and a shaft seal. It has a chamber, and a sealing ring seat is arranged in the chamber, and the sealing ring seat includes a ring member sealed with the inner wall of the chamber, and a ring for dynamic sealing with the shaft seal arranged on the turbine shaft, the ring member, the sleeve The rings are fixedly connected with a ring-shaped connecting piece, and the side of the ring-shaped connecting piece facing the impeller has an arc-shaped end face corresponding to the shape of the impeller. The original connecting disc and the middle shell are changed into the middle shell and the sealing ring sleeve. The larger connecting plate is canceled to avoid product deformation, the original convex seal is changed to groove seal, the oil return space of the product is increased, and the screw compression is changed to the elastic retaining ring compression. The above measures The assembly is convenient, the automatic assembly line is easy to adopt, and the product cost is reduced.

Description

technical field [0001] The invention relates to the core rotor assembly structure of a turbocharger for vehicles, in particular to an exhaust gas turbocharger that can be easily assembled, improves the sealing performance of the product, improves the dynamic performance of the rotor, and has good reliability The core rotor device. Background technique [0002] At present, the domestic automotive turbocharger has been rapidly improved in terms of performance, and has been able to replace imported products, but the reliability of the product restricts its competition with foreign brands. With the increase in product output and the wider application range , There are more and more failures of supercharger lubricating oil leakage and thrust bearing wear, especially in medium-sized trucks, heavy-duty trucks, and passenger cars. The sealing structure of the turbocharger is to prevent the lubricating oil in the middle shell from entering the flow part of the turbocharger, and prev...

AI Technical Summary

Problems solved by technology

In particular, the turbocharger for vehicles works under the condition of a large range of operating conditions, so that the axial force of the supercharger is in a state of large fluctuations, and it is more difficult to solve the sealing of the supercharger

like figure 1 As shown, a current exhaust gas turbocharger core rotor device generally includes an intermediate casing 9, an impeller 2 installed at the end of the turbine shaft 10, a coupling disc 1, a shaft seal 3, a sealing ring 4, an oil baffle 5 and a stopper. The push sleeve 7 and the thrust bearing 6, the sealing ring 8 is arranged between the intermediate shell 9 and the connecting disc 1, the sealing ring 4 is arranged between the connecting disc 1 and the shaft seal 3, and the lubricating oil enters from the oil inlet of the intermediate shell 9, Enter the thrust bearing 6 along the straight oil passage in the middle shell 9, and be thrown out after both sides of the thrust bearing 6 are lubricated, and the lubricating oil in the thrust sleeve 7 is thrown out from the mating surface; After entering the floating bearing, it flows to the oil return port of the middle shell 9 after being lubricated, and is discharged by its own gravity. This kind of sealing structure has a large range of changes in the working conditions of the vehicle turbocharger, and the axial force of the supercharger is relatively large. When the ups and downs change state, part of the lubricating oil still enters the compressor area through the sealing ring 8 and the sealing ring 4, resulting in oil leakage from the supercharger, and the sealing effect is not ideal

The thrust bearing structure of this structure adopts the inner hole to supply oil, and the oil film formation effect is not ideal, which is easy to cause bearing wear

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