Sewer Blockage Detection via Gas Backpressure
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Solution Overview
Problem
Existing sewer blockage detection systems are expensive, difficult to install, and vulnerable to damage due to their mechanical or electrical components being exposed to wastewater, which can lead to contamination and malfunction during use or cleaning operations.
Innovation Solution
A sewer blockage detection system that uses a gas supply to deliver pressurized gas through a duct with a gas inflow opening in the lower circumferential wall of the sewer pipe, measuring back pressures to detect potential blockages and sending an alarm signal when thresholds are exceeded, with no internal mechanical or electrical components, allowing for external operation and self-cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mechanical or electrical components are placed inside the sewer pipe for blockage detection, then detection capability is improved, but reliability deteriorates due to damage from wastewater and cleaning operations
Solution Approach 1:
The detection system extracts all mechanical and electrical components from the sewer pipe interior and relocates them to the exterior. Only a simple gas inlet opening remains inside the pipe, while the compressor, pressure sensor, and control electronics are positioned outside, eliminating vulnerability to wastewater damage and cleaning operations.
Solution Approach 2:
Pressurized gas serves as an intermediary medium to transmit detection information from the sewer pipe interior to the external sensor. The gas flows through the pipe and its backpressure reflects the blockage state, allowing indirect measurement without placing sensitive components inside the harsh environment.
2Measurement precision
If detection components are installed inside the sewer pipe, then detection accuracy is improved, but ease of manufacture and installation deteriorates
Solution Approach 1:
The complex detection assembly is extracted from the pipe interior and reconfigured as an external unit connected via gas flow, simplifying installation to merely creating a small gas inlet opening in the pipe wall while positioning the detection electronics externally.
3Measurement precision
If mechanical components are placed inside the sewer pipe for detection, then detection function is improved, but device complexity increases
Solution Approach 1:
The detection system is extracted from the pipe interior and reconfigured as an external unit, eliminating the need for complex sealed housings, waterproof connectors, and protective mechanisms that would be required for internal installation.
Solution Approach 2:
The mechanical detection approach (physical sensors inside the pipe) is replaced with a pneumatic measurement system using gas backpressure, eliminating mechanical components from the harsh environment and simplifying the overall system architecture.
4Measurement precision
If detection systems with internal components are used, then blockage detection is enabled, but vulnerability to contamination and damage increases
Solution Approach 1:
All vulnerable mechanical and electrical components are extracted from the sewer pipe interior and positioned externally where they are protected from wastewater contamination, urinary stone deposition, and damage during cleaning operations with snakes or other tools.
Solution Approach 2:
Pressurized gas acts as an intermediary that can tolerate the harsh sewer environment, transmitting blockage information to external sensors without requiring sensitive components to be exposed to wastewater, thereby eliminating contamination and damage risks.
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 system provides a cost-effective, user-friendly, and reliable means to predict and prevent sewer blockages by measuring gas pressure differences, allowing for timely maintenance without disrupting sewer operations and maintaining a smooth inner pipe surface.
Implementation Method 1
A gas supply 7 has been provided for delivering pressurized gas to a gas transport duct 8
Implementation Method 2
A measuring organ 10 has been provided for measuring back pressures of pressurized gas when flowing from the gas supply through the duct into the bottom part
Data Source
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AI summary
An assembly of a sewer and a sewer blockage detection system comprises a sewer pipe 1, a gas supply pump 6, a gas transport duct 8, a measuring organ 10 for measuring back pressures of pressurized gas flowing through the duct, and a control unit 15. The control unit comprises at least one threshold value for measured back pressures and is designed to send out an alarm signal when the measured back pressures over a period of time lie above the threshold value. A gas inflow opening 9 has been provided in a lower circumferential wall section of the sewer pipe, such that pressurized gas which is delivered to the duct, gets blown directly through the gas inflow opening in the lower circumferential wall section into the bottom part of the sewer pipe.