Fan Casing With Arc Support Members For Vibration Damping

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Solution Overview

Problem

Conventional fan casings experience significant vibration due to the long propagation path of vibrations from the fan blades, leading to increased noise and reduced operational stability.

Innovation Solution

The shock-absorbing fan casing features X-shaped support members with a base portion and rib portion connected to the corner segments, forming an arc surface that absorbs shock, along with embedded counterweights made of shock-absorbing materials to reduce vibration propagation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If support members are connected to side segments of the outer frame, then the fan casing structure is stable, but vibration propagation path becomes long and vibration increases

Engineering Contradiction:

Improvestructural stabilityVSAvoidvibration

Core Design Contradiction:

Stability of the object's compositionVSObject-generated harmful factors

Solution Approach 1:

The outer frame is segmented into corner segments and side segments, with support members selectively connected only to corner segments. This segmentation interrupts the continuous vibration propagation path that would otherwise travel through all segments, thereby reducing vibration while maintaining structural stability through the distributed corner segment connections.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The connection between support members and side segments is removed entirely. By extracting this harmful connection, the vibration propagation path is shortened and interrupted, preventing vibration from traveling through the side segments while the corner segment connections maintain sufficient structural stability.

Inventive Principle:

Principle #2Taking out (Extraction)

2Device complexity

If support members extend tangentially from the inner seat, then the mounting structure is simple, but vibration propagates throughout the entire outer frame

Engineering Contradiction:

Improvemounting structure complexityVSAvoidvibration propagation

Core Design Contradiction:

Device complexityVSObject-generated harmful factors

Solution Approach 1:

The support members are configured with asymmetric connection points: they extend from the inner seat but connect only to corner segments rather than side segments. This asymmetric arrangement disrupts the symmetric vibration propagation pattern that would occur with tangential connections, reducing overall vibration while maintaining a relatively simple mounting structure.

Inventive Principle:

Principle #4Asymmetry

3Strength

If the outer frame includes all connecting segments, then the fan casing provides complete structural support, but the vibration propagation path is extended

Engineering Contradiction:

Improvestructural supportVSAvoidvibration propagation path

Core Design Contradiction:

StrengthVSLength of stationary object

Solution Approach 1:

The harmful connection between support members and side segments is extracted from the structure. This removal shortens the vibration propagation path by preventing vibration from traveling through the side segments, while the retained corner segment connections maintain sufficient structural support strength.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The connection system is segmented to distinguish between corner segments and side segments. Support members are selectively connected only to corner segments, creating discrete vibration isolation zones that shorten the effective vibration propagation path while maintaining structural integrity through the distributed corner connections.

Inventive Principle:

Principle #1Segmentation

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

This configuration effectively buffers and absorbs vibrations, reducing the overall vibration and noise generated by the fan, enhancing operational stability and noise reduction.

Implementation Method 1

Any two adjacent ones of the base portions are connected to each other so as to form an arc surface that faces a corresponding one of the side segments of the outer frame and that is adapted to absorb shock when the fan is operating

Methodology Applied

Scientific EffectShock absorption: Damping

Data Source

PatentEP4202231A1Shock absorbing fan casing

Publication Date: 2023.06.28 YEN SUN TECH CORP

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AI summary

A fan casing (100) for mounting of a fan includes an outer frame (2) including four corner segments (21) and four side segments (22) that are arranged alternately with the corner segments (21), an inner seat (3) disposed in the outer frame (2), and four support members (4) extending radially and outwardly from the inner seat (3) and connected respectively to the corner segments (21). Each support member (4) includes a base portion (41) connected to the inner seat (3) and having a width reducing in a direction away from the inner seat (3), and a rib portion (42) connected between the base portion (41) and the corresponding corner segment (21). The base portions (41) are interconnected to surround the inner seat (3). Any two adjacent base portions (41) are interconnected to form an arc surface (A) facing the corresponding side segment (22) and adapted to absorb shock.