Radial Fan Rotor With Double Curvature Guide Surface
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Solution Overview
Problem
Radial fans face challenges in achieving efficient flow-head curves while maintaining limited dimensions and reducing energy consumption, noise, and fluid dynamic efficiency, particularly for condensation boilers, and require improved performance across a wide range of flow modulation.
Innovation Solution
The design incorporates a rotor with specifically shaped main and auxiliary blades, a housing configuration, and damping mechanisms to optimize fluid dynamics and reduce energy absorption, featuring a guide surface with double curvature and a support ring to minimize turbulence and enhance performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the rotor dimensions are reduced to achieve compact fan size, then the overall dimensions are limited, but the fluid dynamic efficiency and head generation capability deteriorate
Solution Approach 1:
The patent applies parameter changes by optimizing the geometric parameters of the rotor blades, specifically the wrap angle (30°-50°), the ratio of outer rotor circumference to inner blade circumference (3.5-5.5), and the ratio of rotor diameter to axial height (7-7.5). These parameter optimizations enable compact rotor dimensions while maintaining high fluid dynamic efficiency and head generation capability, resolving the contradiction between size reduction and performance preservation
Solution Approach 2:
The patent employs curved blade profiles with specific geometric characteristics, including arcs of circles with constant radius of curvature for both main blades and splits. This curvature optimization improves fluid flow characteristics and reduces turbulence, enabling efficient operation in a compact rotor volume without sacrificing fluid dynamic performance
2Use of energy by moving object
If the rotor blade configuration is optimized to improve fluid dynamic efficiency, then energy consumption is reduced, but the device complexity increases
Solution Approach 1:
The rotor is segmented into main blades and auxiliary blades (splits) that alternate around the rotation axis. This segmentation allows each blade type to be optimized for specific flow conditions, improving overall fluid dynamic efficiency and reducing energy consumption. The segmented design also facilitates modular manufacturing and assembly, partially offsetting the complexity increase
Solution Approach 2:
Different regions of the rotor blades are given different geometric properties - the main blades have specific wrap angles and curvature radii optimized for primary air movement, while the auxiliary blades have different dimensions optimized for flow control and turbulence reduction. This local quality differentiation improves energy efficiency without requiring complete redesign of the entire rotor structure
3Stress or pressure
If the number of rotor blades is increased to improve head generation, then the static pressure increase is enhanced, but the energy absorption and noise increase
Solution Approach 1:
The auxiliary blades (splits) act as intermediaries between the main blades, providing flow control and turbulence reduction. These intermediate elements help convert chaotic turbulent flow into more ordered flow patterns, enabling high static pressure generation with fewer main blades, thereby reducing noise and energy absorption associated with excessive blade counts
Solution Approach 2:
The curved profiles of both main blades and auxiliary blades, with specifically optimized radius of curvature, improve the smoothness of fluid flow through the rotor. This curvature optimization reduces flow separation and turbulence, enabling effective pressure generation without the need for excessive blade numbers that would increase noise and energy consumption
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables radial fans to achieve efficient flow-head curves with reduced energy consumption and compact dimensions, maintaining high performance across varying flow rates and pressures, while minimizing noise and energy absorption.
Implementation Method 1
a guide surface with double curvature and a support ring to minimize turbulence and enhance performance
Implementation Method 2
The air enters the housing through the suction aperture in the axial direction, crosses the rotor and is discharged from it in the radial direction
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A rotor (2) for a radial fan (1) comprises a plurality of main blades (25) positioned in sequence around a rotation axis (A) and a hub element (36) forming a guide surface (51) from which the main blades (25) project, wherein the guide surface (51) is a rotational surface with respect to the rotational axis (A) with a generatrix forming a convex radially inner portion (52), a concave intermediate portion (53), and, possibly, a substantially rectilinear radially outer portion (54) forming an outer ring that is planar and orthogonal to the rotational axis A.