Volute of centrifugal fan and method for manufacturing volute

Abstract

The invention discloses a volute of a centrifugal fan. The volute comprises a volute body, a diffusion cavity and a centrifugal blade impeller. The volute body is in an Archimedean spiral design or a logarithmic spiral design, the diffusion cavity is connected with the volute body, the centrifugal blade impeller is arranged inside the volute body, and a profile drawing center O of the volute body is deviated relative to the central axis of the centrifugal blade impeller, so that the distance D1 from the centrifugal blade impeller to the inner wall of the diffusion cavity is increased. The invention further discloses a method for manufacturing the volute of the centrifugal fan. The volute and the method have the advantages that airflow diffusion space can be reasonably arranged according to the distribution condition of the air speed of an outlet of the centrifugal fan, and main airflow can be smoothly accelerated from the centrifugal blade impeller, and then flows through the volute body to be transmitted to a diffusion opening of the diffusion cavity; obstacles to the main airflow are reduced, and accordingly integral flow resistance of an air channel of the fan and friction-induced noise of the air channel of the fan are reduced; purposes of preventing the airflow from being collided with the inner wall surface of the volute, increasing the quantity of air and reducing the noise are achieved; the quantity of the air generated by the fan is increased.

Description

technical field [0001] The invention relates to the field of pump parts, in particular to a centrifugal fan volute and a manufacturing method thereof. Background technique [0002] Existing centrifugal fan volutes are all designed according to the Archimedes spiral design or logarithmic spiral. Located on the same straight line, that is, concentrically design the center of the volute body, the center axis of the centrifugal wind impeller, and the geometric center axis of the guide ring, which belongs to the traditional design idea. The traditional design idea does not consider the space limitation of the shell, and the volute shape line is completely designed according to the wind speed distribution at the outlet of the wind impeller, that is, the possibility of collision between the air flow and the inner wall of the volute is small, and there is no need to adopt an eccentric design idea. [0003] Due to the limited housing space of air conditioners, small household applia...

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Problems solved by technology

The traditional design idea does not consider the space limitation of the shell, and the volute shape line is completely designed according to the wind speed distribution at the outlet of the wind impeller, that is, the possibility of collision between the air flow and the inner wall of the volute is small, and there is no need to adopt an eccentric design idea

[0003] Due to the limited housing space of air conditioners, small household appliances and other electrical equipment, it is impossible to design the profile of the volute by drawing the Archimedes spiral or the logarithmic spiral according to the traditional fan theory, so the design and expansion of the volute will be caused. Mismatch of wind speed near the wind impeller outlet of the pressure chamber

If the wind speed and direction near the outlet of the wind impeller in the diffuser cavity do not match the design of the entire volute, it will cause the airflow to collide with the inner wall of the volute, resulting in energy loss and noise

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