Elongate Aeration Diffuser With Recessed Air Distribution Chamber
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing aeration diffusers face issues such as water ingress into the conduit, particulate build-up along the membrane edges, and limitations in length due to pipe mounting or chamber requirements, affecting performance and maintenance.
Innovation Solution
An elongate diffuser design with a recessed diffuser body surface forming a compartment between the membrane and the body, allowing gas distribution without stretching, and incorporating a non-return valve to prevent water ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a pipe mounting system with multiple orifices is used to supply air to the membrane, then air distribution along the membrane length is improved, but device complexity and installation difficulty increase due to considerable pipe work and alignment requirements
Solution Approach 1:
The diffuser body and air supply conduit are merged into a single integrated structure. The elongate diffuser body itself forms the air distribution conduit, eliminating the need for separate pipe work and multiple orifices. Air is supplied through the diffuser body wall along its entire length, combining the structural support function and air distribution function into one component.
Solution Approach 2:
The diffuser body serves multiple functions simultaneously: it provides structural support, forms the air distribution conduit, and acts as the mounting surface for the membrane. This multi-functional design eliminates the need for separate pipe work and reduces installation complexity while maintaining effective air distribution.
2Reliability
If sealing parts extend above the membrane edges to prevent water ingress, then sealing effectiveness is improved, but particulate build-up occurs along the membrane edges affecting performance
Solution Approach 1:
The sealing function is extracted from the raised sealing parts that extended above the membrane edges. Instead, sealing is achieved through the intimate contact between the membrane edges and the diffuser body surface, with the air pressure differential providing the sealing force. This eliminates the particulate-trapping sealing parts while maintaining sealing effectiveness.
Solution Approach 2:
The air pressure differential, which could potentially cause leakage, is converted into a beneficial sealing force. The positive air pressure behind the membrane pushes the membrane edges against the diffuser body surface, creating an effective seal without requiring raised sealing parts that would trap particulates.
3Area of stationary object
If the diffuser is made longer to cover larger treatment areas, then aeration coverage is improved, but air pressure differences increase along the membrane length affecting uniformity
Solution Approach 1:
The air supply is segmented into multiple entry points distributed along the length of the diffuser body. Rather than a single air supply point, air can be introduced at multiple locations along the diffuser, reducing the pressure differential along the length and enabling uniform air distribution across longer diffuser lengths.
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
Enhances gas distribution along the diffuser length, reduces water ingress, and maintains performance by preventing particulate build-up, enabling longer diffuser lengths without additional pipe work.
Implementation Method 1
Gas (normally air) is introduced into the diffuser, and passes through small slits in the membrane to form bubbles in the waste water
Implementation Method 2
a non-return valve to prevent water ingress
Data Source
Figure 1(a)
Figure 1(b)~2
Figure 3~4
AI summary
An elongate diffuser (10) comprises a diffuser body (30), and a membrane (20) attached so that introduction of gas at a working pressure into the diffuser displaces part of the membrane (20) from contact with the diffuser body (10) providing an elongate sealed compartment (50) between the membrane (20) and a surface (32) of the diffuser body (30). The gas can pass from the compartment (50) through the membrane (20) for aeration of fluid in which the diffuser (10) is immersed. The diffuser body surface (32) which bounds the compartment (50) is recessed away from the membrane (20) in use, to contribute to the lateral cross sectional area of the compartment (50) and facilitate distribution of gas along the diffuser by the compartment (50). An automatic purge valve for purging water from a gas feed pipe of a diffuser is also disclosed.