Outdoor AC Fan Bracket Layout for Low-Noise Air Exhaust
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Solution Overview
Problem
Air conditioner outdoor units face challenges in maintaining low operating noise and high aerodynamic efficiency due to improper designs of heat exchangers, fan wheels, motors, brackets, and mesh covers, leading to air volume loss and aerodynamic noise.
Innovation Solution
The design includes a housing with a heat exchanger and a fan assembly where the distance between the bracket and the heat exchanger (L1) is optimized to 0≤L1≤0.15D, and the mesh cover has a blockage ratio of 0.12≤σ≤0.15, ensuring high air exhaust volume and reduced noise by minimizing speed loss and noise generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the bracket is positioned closer to the heat exchanger to reduce space, then the structural compactness is improved, but the air volume loss increases and aerodynamic noise worsens
Solution Approach 1:
The patent applies parameter changes by optimizing the distance L1 between the bracket and heat exchanger to a specific range (0.05D≤L1≤0.15D), where D is the fan wheel diameter. This quantitative parameter optimization resolves the contradiction by finding the optimal balance point where the bracket is close enough to maintain compactness but far enough to avoid significant air volume loss and noise generation.
2Strength
If the mesh cover blockage ratio is increased to improve structural strength, then the strength is improved, but the air exhaust volume decreases
Solution Approach 1:
The patent applies parameter changes by optimizing the mesh cover blockage ratio σ to a specific range (0.12≤σ≤0.15). This quantitative optimization resolves the contradiction between strength and air exhaust volume by finding the optimal blockage ratio that provides sufficient structural strength while maintaining high air permeability for efficient heat exchange and air exhaust.
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 achieves high air exhaust volume and low noise levels by optimizing the distance between the bracket and heat exchanger and the mesh cover's blockage ratio, enhancing both efficiency and structural strength.
Implementation Method 1
a fan assembly. The fan assembly includes: a bracket arranged in the first cavity and above the heat exchanger, and connected to the housing; a motor in the first cavity and on the bracket; and a fan wheel arranged in the first cavity and connected to the motor
Implementation Method 2
a heat exchanger in the first cavity, in which in a horizontal direction, the heat exchanger includes a first portion and a second portion opposite to each other
Data Source
AI summary
An air conditioner outdoor unit, including a housing, a heat exchanger, a fan wheel, an electric motor and a support, and the housing is provided with a first cavity and an air outlet in communication with the first cavity; the heat exchanger is arranged in the first cavity and connected to the housing; in a horizontal direction, the heat exchanger includes a first portion and a second portion which are opposite each other, a minimum distance S being provided between the first portion and the second portion; the support is arranged in the first cavity, is connected to the housing, and is located above the heat exchanger; the electric motor is in the first cavity and is arranged on the support; the fan wheel is in the first cavity, is connected to the electric motor, and has a diameter of D; and a first portion of the support is opposite the heat exchanger in a vertical direction, the minimum distance between the first portion and the heat exchanger in the vertical direction is L1, and when S<D, 0≤L1≤0.15D.