A kind of turbocharger and the method for improving turbocharger supercharging efficiency

Abstract

The invention provides a turbocharger applied to the field of engines, and also relates to a method for improving the boost efficiency of the turbocharger. The turbocharger comprises a pressure shell (1), a pressure impeller (2), a blade tip clearance (3) and a wearable coating (4), wherein the wearable coating (4) is arranged on the surface of a pressure shell inner cavity (5) of the pressure shell (1), covers the position of a matched profile of the pressure shell inner cavity (5) and the pressure impeller (2), and comprises a coating substrate (6) and a solid lubricant (7). Through the technical scheme, the problem of low reliability due to a small clearance is solved; the leakage rate is greatly reduced, so the performance of a compressor is improved; the pneumatic noise of the turbocharger is greatly reduced; meanwhile, the requirement on the processing equipment of the turbocharger is reduced.

Description

technical field [0001] The invention relates to the field of engines, more specifically, the invention relates to a turbocharger, and at the same time, the invention also relates to a method for improving the supercharging efficiency of the turbocharger. Background technique [0002] At present, engine boosting is a relatively common technology. An exhaust gas turbocharger is installed on the engine, and the exhaust gas drives the turbine assembly in the volute to rotate, driving the coaxial pressure impeller to rotate, so that the air is compressed by the pressure shell. , into high-pressure gas into the engine cylinder, due to the increased air density for combustion, that is, the increase in the mass flow rate of air, correspondingly more fuel can be injected, so that the engine can generate more work. With the continuous advancement of automobile energy saving and emission reduction policies, the performance requirements of turbochargers are getting higher and higher, wh...

AI Technical Summary

Problems solved by technology

If the blade tip clearance is too small, due to the movement and deflection of the turbine assembly, it is easy to cause shell rubbing, performance degradation or even damage to the impeller or shell, reducing reliability

Since the reliability of the engine must be the most concerned issue, the blade tip clearance is usually designed to be larger, so as to avoid the reliability problem caused by the shell rubbing caused by too small clearance, but the result is an increase in gas leakage , reduced efficiency

Images