Ventilator Fan Unit Inlet Flow Guidance for Pressure and Noise Control
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Solution Overview
Problem
Conventional fan units for ventilators lack improved operating performance, particularly in terms of fluid pressure and rotational efficiency, and often result in mechanical wear, vibrations, and noise due to unsuitable fluid flow management.
Innovation Solution
A fan unit with a suction connector featuring flow guiding elements on its inner face, such as ribs or grooves, that alter the inlet duct diameter to control fluid flow, enhancing pressure and reducing rotational speed requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If the rotational speed of the fan impeller is increased to achieve higher outflow pressure, then the outflow pressure is improved, but mechanical wear, vibrations and noise increase
Solution Approach 1:
The invention changes the geometric parameters of the inlet duct by providing flow guiding elements (ribs or grooves) on the inner face of the suction connector. This modifies the inlet duct internal diameter to differ from the nominal diameter, optimizing the fluid flow characteristics and allowing the fan impeller to operate at lower rotational speeds while maintaining the required outflow pressure, thereby reducing mechanical wear, vibrations and noise
Solution Approach 2:
The invention applies flow guiding elements at specific locations on the inner face of the suction connector to create localized flow guidance. This local modification of the inlet duct geometry optimizes the fluid flow distribution without requiring changes to the entire system, enabling improved pressure characteristics at reduced rotational speeds
2Object-affected harmful factors
If the rotational speed of the fan impeller is reduced to decrease mechanical wear and noise, then harmful factors are reduced, but the outflow pressure decreases
Solution Approach 1:
The invention modifies the inlet duct parameters by providing flow guiding elements that create a controlled difference between the inlet duct internal diameter and nominal diameter. This parameter change optimizes the fluid flow efficiency, allowing the system to maintain the required outflow pressure at lower rotational speeds, thus reducing mechanical wear and noise while preserving pressure performance
3Productivity
If the inlet duct diameter is increased to improve fluid flow, then fluid flow is improved, but the device complexity increases
Solution Approach 1:
The invention provides flow guiding elements (ribs or grooves) on the inner face of the suction connector to create localized flow guidance. This local modification optimizes fluid flow without requiring a complete redesign or significant increase in the overall inlet duct diameter, thereby improving fluid flow while minimizing the increase in device complexity
Solution Approach 2:
The flow guiding elements divide the inlet duct flow into multiple flow paths or zones, creating a segmented flow pattern that improves overall fluid flow efficiency. This segmentation approach enhances productivity without requiring a proportional increase in the total inlet duct cross-sectional area
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 fan unit achieves increased fluid pressure and reduced rotational speed, improving operational efficiency, reducing mechanical wear and noise, and optimizing fluid flow management.
Implementation Method 1
The suction connector has at least one flow guiding element on its inner face, which flow guiding element sets an inlet duct internal diameter which differs from the inlet duct nominal diameter
Implementation Method 2
the fan impeller which is mounted rotatably in the housing and by means of which, by way of rotation, a fluid can be sucked in through an inlet duct of the housing and can subsequently be ejected again through an outlet duct of the housing
Data Source
AI summary
Fan unit for a ventilator, comprising a housing with a suction connector which forms an inlet duct for the suction-side inflow of a fluid into the housing, a pressure connector which forms an outlet duct for the pressure-side outflow of the fluid from the housing, and a fan impeller mounted rotatably in the housing and being configured, by rotation, to suck in the fluid via the suction connector and to convey it through the inlet duct into the housing, and to eject the fluid again via the pressure connector and to convey it through the outlet duct out of the housing. The suction connector has at least one flow guiding element on its inner face which faces the inlet duct and defines an inlet duct nominal diameter, by which element an inlet duct internal diameter differing at least in sections from the inlet duct nominal diameter is set.