Volute molded line drawing method, check valve molded line drawing method, air duct structure and range hood

Abstract

The invention relates to the technical field of extractor hood design, in particular to a volute molded line drawing method, a check valve molded line drawing method, an air duct structure and a range hood. The volute molded line drawing method provided by the invention comprises steps: on the basis of the volute first molded line generated by the logarithmic spiral line, increasing the opening degree of a first spiral line segment gradually and equivalently according to the area, and then re-fitting into a second spiral line segment; fitting the second spiral line segment with a first straight line segment, a second straight line segment, a volute tongue molded line and a third straight line segment of the volute first molded line to form a final volute second molded line; compared with an existing volute molded line generation method, the volute molded line drawing method provided by the invention has the advantages that the advantages of a logarithmic spiral line are reserved, meanwhile, local correction can be conveniently and quickly performed on the volute molded line according to limiting conditions, so that the volute molded line is uniformly increased and is not abruptly changed, finally, airflow acceleration in a volute is more uniform and stable, pressure pulsation is reduced, and aerodynamic noise is lowered.

Description

technical field [0001] The invention relates to the technical field of range hood design, in particular to a method for drawing a volute profile, a method for drawing a check valve profile, an air duct structure and a range hood. Background technique [0002] The air duct system of the household range hood is mainly composed of a volute assembly, an impeller, a motor assembly, and a check valve. The volute and the check valve provide a flow channel for the gas; shell outlet and convert part of the dynamic pressure to static pressure. The flow in the volute is very complicated. While the gas flows along the volute, the gas continuously enters the volute from the impeller, that is, the gas flows while mixing. Therefore, the design of the volute directly determines the aerodynamic performance of the fan, and then determines The aerodynamic performance and noise performance of the range hood. [0003] At present, the design of the volute profile usually adopts the four-segment...

AI Technical Summary

Problems solved by technology

If the width and height of the volute change, it is only necessary to modify the R coefficient in the equation to obtain the correction of the entire curve, but there are also defects that local corrections cannot be made.

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