Centrifugal compressor impeller structure suitable for threaded connection

Abstract

The invention provides a centrifugal compressor impeller structure suitable for threaded connection. The centrifugal compressor impeller structure suitable for threaded connection comprises an aluminum alloy hub and a resin impeller, wherein the aluminum alloy hub is arranged in the position of the axis of the resin impeller, and a threaded hole used for being connected with a turbine rotary shaft is formed in the hub back of one end of the aluminum alloy hub. Compared with the prior art, the centrifugal compressor impeller structure suitable for threaded connection has the following advantage that a thread connected with the turbine rotary shaft is machined on the hub back of the aluminum alloy hub; and compared with a traditional hollow shaft type centrifugal compressor impeller, the stress of the center of the impeller is reduced to a great extent, damage to the resin impeller is controlled more effectively, and the using strength of the resin impeller is improved.

Description

technical field [0001] The invention belongs to the technical field of exhaust gas turbocharging, and in particular relates to a centrifugal compressor impeller structure suitable for screw connection. Background technique [0002] As the power density of internal combustion engines increases, exhaust gas turbocharging is required to achieve higher pressure ratios. However, with the continuous improvement of the boost pressure ratio, the problems of low-speed torque characteristics and poor transient response of the engine will become more and more serious. Matching requires that the centrifugal compressor must have good dynamic responsiveness, so improving the dynamic responsiveness of the centrifugal compressor has become one of the key technologies to achieve a good match between the supercharging system and the engine. [0003] At present, the centrifugal compressor impeller is generally made of aluminum alloy. Due to the limitation of the material, there is a hysteresi...

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Problems solved by technology

However, with the continuous improvement of the boost pressure ratio, the problems of low-speed torque characteristics and poor transient response of the engine will become more and more serious. Matching requires that the centrifugal compressor must have better dynamic responsiveness, so improving the dynamic responsiveness of the centrifugal compressor has become one of the key technologies to achieve a good match between the booster system and the engine

[0003] At present, the centrifugal compressor impeller is generally made of aluminum alloy. Due to the limitation of the material, there is a hysteresis effect in the process of converting the kinetic energy transmitted from the turbine to the compressor into the pressure energy of the gas. Using lighter materials can shorten the time when the engine accelerates. The acceleration time of the supercharger rotor and the improvement of intake delay, thereby improving the low-speed torque performance and transient response of the engine; therefore, the resin impeller is introduced into the design of the supercharger centrifugal compressor, but the resin impeller faces a relatively high centrifugal stress. Therefore, there is an urgent need for a method to improve the stress of the resin impeller of the centrifugal compressor, so that the resin impeller of the centrifugal compressor can withstand a higher stress state

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