Double-Suction Fan Hub Plate Layout for Even Airflow Distribution
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Solution Overview
Problem
Conventional double suction fans suffer from air flow concentration at the center portion, leading to increased resistance and reduced performance, especially when air volume increases, due to the lack of a hub structure to distribute air evenly, which is costly to manufacture with a hub using existing methods.
Innovation Solution
A double suction fan design featuring rotating hubs formed from smooth, hub plates with specific geometries, such as circular pipes and arc plates, that distribute air evenly along the longitudinal direction of blades, preventing central air flow concentration and allowing for injection molding, reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a hub structure is added to distribute air flow in the center portion, then air flow concentration is reduced, but manufacturing cost increases significantly
Solution Approach 1:
The hub is divided into multiple hub plates (first hub plate, second hub plate, third hub plate, fourth hub plate) arranged around the shaft hole. Each hub plate has a smooth outer surface without protrusions, allowing them to be formed as integrated parts with the fan blades through injection molding, eliminating complex assembly while achieving air flow distribution
Solution Approach 2:
The hub structure is merged with the fan blade assembly as a single integrated component formed through injection molding. The hub plates are positioned such that their outer surfaces form a smooth contour that does not interfere with the injection molding process, combining the hub function with the fan blade structure
2Quantity of substance
If the air volume of the double suction fan is increased, then air flow capacity is improved, but air flow concentration at the center portion becomes more severe
Solution Approach 1:
The hub plates are strategically positioned at specific locations around the shaft hole to create localized air flow distribution zones. The first and second hub plates are arranged on one side of the intermediate plate while the third and fourth hub plates are arranged on the other side, creating symmetric local quality adjustments that distribute air flow evenly across the entire fan area
Solution Approach 2:
The hub plates act as intermediary structures between the shaft hole and the fan blades. Their smooth outer surfaces guide the air flow from the center region toward the blade regions, mediating the transition and preventing direct concentration of high-velocity air flow at the center portion
3Length of moving object
If the length of the double suction fan is increased, then air flow capacity is improved, but air flow concentration at the center portion is aggravated
Solution Approach 1:
The hub plates extend in the axial direction (length dimension) of the fan, creating a three-dimensional air flow distribution structure. By positioning hub plates at different axial locations and arranging them symmetrically, the air flow distribution is achieved across multiple dimensions, effectively counteracting the concentration effect that worsens with increased fan length
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 design effectively distributes air flow, reducing central concentration and backflow, improving air conditioner performance and manufacturing efficiency by using injection molding processes.
Implementation Method 1
a plurality of hub plates 161, 162 which are disposed perpendicular to the intermediate plate 13 around the shaft hole 13a, and which are formed to evenly distribute air introduced through the first ring 11 and the second ring 12 in a longitudinal direction of the plurality of first blades 14 and the plurality of second blades 15 when the intermediate plate 13 rotates
Data Source
Figure 1
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AI summary
A double suction fan includes first and second rings spaced at a predetermined distance apart from and in parallel to each other, an intermediate plate disposed between the first and second rings and including a shaft hole, a plurality of first blades disposed between the first ring and the intermediate plate, a plurality of second blades disposed between the second ring and the intermediate plate, and first and second rotating hubs disposed on both side surfaces of the intermediate plate, wherein each of the first and second rotating hubs is formed of a plurality of hub plates which are disposed perpendicular to the intermediate plate around the shaft hole, and wherein the plurality of hub plates are formed to evenly distribute air introduced through the first and second rings in a longitudinal direction of the plurality of first and second blades when the intermediate plate rotates.