Multi-Part Axial Ventilator Housing for Low-Noise Diffusion
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Solution Overview
Problem
Existing ventilator housings have high production costs and poor efficiency, especially in the medium and lower pressure range, along with high noise levels due to the use of sheet metal diffusers.
Innovation Solution
The ventilator housing is designed with an outer diffuser formed from multiple ring sections connected mechanically and an inner diffuser with a central air guide section, both made from plastic, which reduces tool costs and improves efficiency and noise performance by optimizing the diffuser's geometry and structural arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a sheet metal diffuser is used in the ventilator housing, then the structural strength is sufficient, but the production costs are high and the efficiency is poor
Solution Approach 1:
The patent changes the material parameter from sheet metal to plastic for the diffuser, and optimizes geometric parameters including a cone angle of 10° to 18° (particularly 12° to 15°), and a height-to-diameter ratio (L:D1) of 0.25 to 1.0 (preferably 0.25 to 0.8). These parameter changes enable cost reduction through plastic manufacturing while achieving improved efficiency in the medium and lower pressure range.
2Object-affected harmful factors
If a sheet metal diffuser is used in the ventilator housing, then the structural integrity is maintained, but the noise level is high
Solution Approach 1:
The patent changes the material from sheet metal to plastic and optimizes geometric parameters including cone angle (10° to 18°) and height (200-800 mm above fan blades), achieving reduced noise levels in the medium and lower pressure range while maintaining sufficient structural integrity through the optimized plastic diffuser design.
3Productivity
If the diffuser height is increased to improve efficiency, then the efficiency in medium and lower pressure range improves, but the device complexity increases
Solution Approach 1:
The patent optimizes the diffuser height parameter to be 200-800 mm above the fan blades (L:D1 ratio of 0.25 to 1.0), and combines this with a conical geometry (10° to 18° cone angle). This parameter optimization achieves improved efficiency in the medium and lower pressure range while maintaining manageable structural complexity through the standardized conical design.
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 multi-part diffuser design reduces production costs and enhances efficiency and noise reduction in the medium and lower pressure range, while the inner diffuser prevents hub backflow and optimizes airflow, resulting in a more effective and quieter ventilator housing.
Implementation Method 1
an annular diffuser (6) connected to this on the outflow side, with an inflow opening (7) and an outflow opening (8), in which the outer diffuser (6) is formed from at least two partial ring sections (12)... the outer diffuser (6) widens conically from its inflow opening (7) to its outflow opening (8) with a cone angle α of 10° to 18°
Implementation Method 2
the outer diffuser (6) is formed from at least two partial ring sections (12), which are connected by means of mechanical connecting means (13) on its outer peripheral surface
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The present invention relates to a housing for a ventilator or ventilator, in particular an axial ventilator, comprising a wall ring (2) with an inlet nozzle section (3) and an annular external diffuser (6) connected to the wall ring (2) on the outflow side and having an inflow opening (7) and a Outflow opening (8) and a holder for an electric motor (9) of the fan, which is arranged in an interior of the housing. The outer diffuser (6) is formed from at least two partial ring sections, which are connected by means of mechanical connecting means on its outer peripheral surface. The holder is formed from a plurality of struts (14) which can be fastened to an inner peripheral surface of the outer diffuser (6) with one end, are spaced apart circumferentially, can be fastened in the edge region of its inflow opening (7) and which have the other ends on a motor flange (16) of a motor housing ( 17) of the electric motor (9) can be mounted.