Radial Ventilation Device Conical Baffle Noise Reduction
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Solution Overview
Problem
Ventilation devices with axial fans and radial air flow suffer from high noise levels and reduced efficiency due to air collisions with end baffles, leading to decreased flow capacity.
Innovation Solution
The ventilation device features a unique air duct structure with a cylindrical section, a larger cylindrical section for the axial fan blade, a funnel-shaped section with a conical baffle, and a streamlined member, creating a radial air passage that minimizes turbulence and noise, with the baffle's diameter increasing outwardly to direct airflow radially.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a straight tube with an end flat baffle is used to divert air outflow radially, then the device structure is simple, but the noise level increases and efficiency decreases due to direct air collision with the baffle
Solution Approach 1:
The patent replaces the flat end baffle with a conical baffle that has a curved surface. The conical shape with its sloping surface allows air to be gradually diverted radially rather than abruptly colliding with a flat surface, reducing turbulence and noise while maintaining structural simplicity.
2Device complexity
If a straight tube with an end flat baffle is used to divert air outflow radially, then the device structure is simple, but the flow capacity and efficiency are reduced due to direct air collision with the baffle
Solution Approach 1:
The conical baffle's curved surface guides air flow smoothly from axial to radial direction, preventing flow separation and turbulence that would occur with a flat baffle. This maintains higher flow capacity and efficiency while keeping the overall structure simple.
3Ease of manufacture
If the air duct has a constant diameter, then the manufacturing is simple, but the air flow experiences turbulence and losses when transitioning to radial outflow
Solution Approach 1:
The patent introduces a conical section in the air duct where the diameter gradually changes from the axial inlet to the radial outlet. This gradual parameter change allows smooth air flow transition without abrupt expansions or contractions, minimizing turbulence and energy losses while remaining manufacturable.
4Device complexity
If a flat end baffle is used for radial air diversion, then the device structure is simple, but the noise levels are high due to direct air collision
Solution Approach 1:
The conical baffle replaces the flat end baffle with a sloping curved surface that gradually redirects air flow radially. This eliminates the sudden air collision with a flat surface, significantly reducing noise generation while maintaining a relatively simple single-piece baffle structure.
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 design enhances airflow rate and efficiency while reducing noise levels by ensuring smooth airflow and minimizing losses, resulting in improved performance and quieter operation.
Implementation Method 1
a coniform baffle is arranged immediately after the hub of the blade in front of the opening of the third section, said coniform baffle constituting a rotation-symmetric body with continuous conical circumferential surface... Between the outer circumferential surface of the coniform baffle and the inner circumferential surface of the third section of the air duct a radial air passage is formed
Implementation Method 2
a third funnel shaped section, whose diameter gradually increases outwards towards its opening... the inner circumferential surface of the third section transfers from parallel to the axis line of the axial fan into a plane that is perpendicular to said axis line
Implementation Method 3
ventilation device with axial fan and radial air flow... an accommodated in it axial fan
Data Source
Figure 1
AI summary
The ventilation device with a radial air flow solves the problem of supplying premises with fresh air with an increased air outflow, improved efficiency and lower noise levels. The ventilation device comprises an air duct (1) with variable circular section, consisting of three successive parts and an accommodated inside it axial fan (2). The tird section of the air duct (1) expands like a funnel and together with a coniform baffle (3) forms a radial air passage. The coniform baffle (3) is arranged after the fan in the direction of the exit for the air and represents a truncated cone with gradually increasing diameter. A streamlined member (4) is arranged in front of the hub of the fan (2).