Shaft seal arrangement of turbocharger

Pumps – Motor driven – Fluid motor

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277 3, F02B 3344, F04B 1700

Patent

active

050767658

ABSTRACT:
A shaft seal arrangement of a turbocharger for an internal combustion engine having a throttle valve disposed upstream of a compressor of the turbocharger. The shaft seal arrangement is comprised of first and second seal rings fitted on a cylindrical thrust spacer mounted on a rotatable shaft on which turbine and compresser wheels are mounted. The first and second rings are located spaced from each other and positioned between the compressor and bearings for the rotatable shaft. An annular air chamber is formed between the first and second seal rings and supplied with atmospheric air through an air supply passage. The cross-sectional area of the air supply passage is set such that an increase in pressure difference between the air chamber and the side of the bearings over an experimental pressure difference value at which oil leakage from the bearing side to the compressor side begins is prevented, thereby effectively avoiding oil leakage even in an engine operating condition in which the throttle valve is fully closed.

REFERENCES:
patent: 4196910 (1980-04-01), Aizu
patent: 4613288 (1986-03-01), McInemey
patent: 4640630 (1987-02-01), Yoshioka et al.
patent: 4781553 (1988-11-01), Nomura et al.
D. G. Wilson: "Design of High Efficiency Turbomachinery and Gas Turbines", pp. 74-75, M.I.T. Press, Cambridge, U.S., 5/1990.

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