Double-rear-slot casing processing device capable of effectively broadening flow range of compressor

Abstract

The invention provides a double-rear-slot casting processing device capable of effectively broadening the flow range of a compressor. The double-rear-slot casting processing device comprises a turbine shell and an impeller. The turbine shell comprises an inner shell body, an outer shell body and an air outlet pipe. The inner shell body is sleeved with the outer shell body, and an air circulation cavity is defined by the inner shell body and the outer shell body. An air runner is arranged in the inner shell body. Both the rear end of the air circulating cavity and the rear end of the air runner are communicated with the outside. The impeller is arranged in the air runner through an impeller shaft fixed to the front end of the inner shell body in a rotating manner. The impeller is divided into a main blade and a splitter blade. The portion, between the front edge of the main blade and the front end of the splitter blade, of the inner shell body is provided with a first rear slot. The portion, located in the middle of the air runner, of the inner shell body is provided with a second rear slot. Both the first rear slot and the second rear slot are distributed at a certain angle in the peripheral direction. By means of the double-rear-slot casting processing device capable of effectively broadening the flow range of the compressor, the surging flow of the compressor can be reduced while the blocking flow of the compressor is increased effectively, and the purpose of broadening the stable flow range of the compressor is achieved.

Description

technical field [0001] The invention belongs to the field of internal combustion engines, and in particular relates to a double rear groove case processing device capable of effectively widening the flow range of a compressor. Background technique [0002] The requirements of high power density and plateau power recovery of internal combustion engines require the boost pressure ratio of the supercharger and compressor to be continuously increased. As the boosting ratio continues to increase, the Mach number at the impeller inlet continues to increase, and the internal flow of the centrifugal compressor is transformed into a transonic flow structure, which will lead to a sharp decrease in the stable working range of the centrifugal compressor and a decrease in efficiency. The supercharged internal combustion engine involves the matching between the rotary impeller machinery and the reciprocating piston. Especially for vehicle operating conditions, due to the wide engine speed...

AI Technical Summary

Problems solved by technology

As the boosting ratio continues to increase, the Mach number at the impeller inlet continues to increase, and the internal flow of the centrifugal compressor is transformed into a transonic flow structure, which will lead to a sharp decrease in the stable working range of the centrifugal compressor and a decrease in efficiency

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