Scroll-Guided Fan Duct Layout for Low-Noise Refrigerator Ventilation
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Solution Overview
Problem
Refrigerator ventilation devices face challenges in reducing fan revolutions, noise, and component lifespan due to increased flow path resistance and cooling fin density, leading to excessive fan speed and noise, as well as potential vortex formation and backward air flow.
Innovation Solution
A ventilation device with a fan having a hub, concave blades, and a scroll guide with ducts that guide cold air, featuring specific angled surfaces and straight lines to minimize shaft power and prevent vortex formation, while increasing internal capacity and reducing noise and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the diameter of the fan is reduced to increase internal capacity, then the internal capacity increases, but the rotational speed increases excessively according to affinity laws
Solution Approach 1:
The patent applies parameter changes by modifying the blade geometry parameters (convex shape, specific angles, curvature) to optimize the fan's performance. This allows the fan to maintain lower rotational speed while achieving the required airflow, resolving the contradiction between reduced diameter and excessive speed increase.
2Productivity
If the flow path resistance increases due to narrower cold air flow path and increased cooling fins, then the heat exchange efficiency improves, but the rotational speed of the fan increases excessively
Solution Approach 1:
The patent modifies the blade parameters and flow path geometry to reduce flow resistance. The optimized blade shape and angle parameters enable efficient airflow through the narrower passage with fewer cooling fins, maintaining heat exchange efficiency while preventing excessive fan speed increase.
3Productivity
If the rotational speed of the fan increases excessively, then the airflow demand is met, but noise increases due to aerodynamic force and vibration
Solution Approach 1:
The patent optimizes blade parameters including convex shape, angles, and curvature to reduce aerodynamic forces and vibrations at lower rotational speeds. This parameter optimization enables the fan to deliver required airflow with minimal noise generation.
4Productivity
If the rotational speed of the fan increases excessively, then the airflow demand is met, but the lifespan of components such as motor and bearing decreases
Solution Approach 1:
The patent applies parameter changes to optimize blade geometry for efficient operation at lower rotational speeds. This reduces mechanical stress and wear on motor and bearing components, extending their lifespan while maintaining required airflow performance.
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 reduces fan revolutions, noise, and vibration, improves discharge efficiency, and extends component lifespan by optimizing the fan's design to reduce shaft power and prevent backward air flow and vortex formation.
Implementation Method 1
noise increases due to an aerodynamic force or a vibration resultant from an excessive increase in the number of revolutions of the fan
Implementation Method 2
a scroll guide configured to guide a cold air discharged from the fan in both directions
Data Source
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AI summary
A ventilation device is disclosed. The ventilation device comprises a fan comprising a hub coupled to a rotating shaft, a plurality of blades disposed at the hub and disposed radially with respect to the rotating shaft, and a shroud connecting the plurality of blades, a scroll guide configured to guide a cold air discharged from the fan in both directions, and first and second ducts extending from the scroll guide and extending along a rotation direction of the fan, wherein in the first and second ducts, a length of a hub-side surface is greater than a length of a shroud-side surface.