Movable Volute Casing for Shorter Range Hood Airflow Paths
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Solution Overview
Problem
Range hoods with long internal air circulation passages experience significant air quantity and pressure loss when discharging air into a room, leading to poor sound quality due to high-frequency airflow whistles caused by large air pressure at high speeds.
Innovation Solution
A range hood design with a shorter air flow distance by incorporating a movable housing part that can shift between closed and open positions, allowing air to flow directly from the volute casing to the hood circulating air outlet, reducing air quantity and pressure loss, and improving exhaust efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the internal circulation air passage is made long to discharge air into the room, then the air discharge function is achieved, but air quantity and air pressure loss increases significantly
Solution Approach 1:
The volute casing is designed with a movable housing part that can dynamically switch between open and closed positions. When opened, it creates a short air passage for circulating mode; when closed, it directs air through the exhaust outlet for exhaust mode. This dynamic configuration allows the air passage length to adapt to different operating modes, reducing air loss in circulating mode while maintaining exhaust functionality.
2Adaptability or versatility
If a switching plate is opened or closed towards an external direction of a volute casing spiral, then mode switching is achieved, but air pressure jacks up the movable housing part causing connection gaps and high-frequency airflow whistles
Solution Approach 1:
The movable housing part is designed to move along the spiral direction of the volute casing rather than opening/closing perpendicular to it. This spiral-aligned movement allows the switching plate to follow the natural flow direction, preventing sudden pressure changes that cause the housing part to jack up and create connection gaps. The gradual, directional movement eliminates high-frequency airflow whistles while maintaining effective mode switching.
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 reduces air quantity and pressure loss, enhancing exhaust efficiency and minimizing noise issues by shortening the air flow distance and stabilizing the air flow, thus improving user experience.
Implementation Method 1
when the air pressure is large at a high speed level, a connection gap jacked up will generate an air flow whistle with high frequency
Data Source
AI summary
A range hood is provided. The range hood includes a volute casing, a volute casing air inlet and a volute casing exhaust outlet in communication with a hood exhaust outlet are provided in the volute casing. The volute casing includes a fixed housing part and a movable housing part, the movable housing part is movable relative to the fixed housing part; the fixed housing part is fitted with the movable housing part and air is discharged from the volute casing exhaust outlet when the movable housing part is in a closed position; the movable housing part is staggered relative to the fixed housing part to allow the air to be discharged into a room when the movable housing part is in an open position. When the range hood exhausts air to the room, a flow distance of the air is short, improving operational efficiency.