Centrifugal impeller and ventilation device using same

By designing a centrifugal impeller with backward-curved blades and optimizing the blade shape and installation position, the problems of low efficiency and high noise of the ventilation device were solved, achieving higher air volume and efficiency while reducing energy consumption and noise.

CN121854474APending Publication Date: 2026-04-14JOHNSON ELECTRIC GUANGDONG CO LTD
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Patent Information

Application Number
CN202411427776.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-10-12
Publication Date
2026-04-14

AI Technical Summary

Technical Problem

Existing ventilation devices have inefficient and noisy centrifugal impellers, which cannot meet consumers' demand for high efficiency and low noise.

Method used

Design a centrifugal impeller with backward-curved blades, wherein the first included angle between the inner and outer radial sides of the blades is not less than 140 degrees, and the number of blades is 23 to 31. Combine specific included angles and ratios to optimize the shape and installation position of the blades, thereby forming a larger windward surface and higher static pressure.

Benefits of technology

It improves the airflow and efficiency of the centrifugal impeller, reduces noise, and is characterized by lower speed, energy consumption and noise level, with a significant increase in airflow per watt of power consumption.

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Abstract

The invention relates to a centrifugal impeller and a ventilation device using the same. The centrifugal impeller comprises a central part, a connecting part and a plurality of blades surrounding the central part, wherein the connecting part extends outwards from the central part and is connected to the blades; the blade is bent from the radial inner side to the radial outer side, and a first included angle (alpha) formed by a first tangent line (L1) of the windward side of the blade on the radial outer side and a second tangent line (L2) of the windward side of the blade on the radial inner side is not smaller than 140 degrees and smaller than 180 degrees. Compared with a traditional straight blade scheme, the backward bent blade has larger air volume and higher efficiency, and the centrifugal impeller and the ventilation device can have better air inlet volume and efficiency.
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