Self-Cleaning Negative-Pressure Ejector for Blockage Prevention
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Solution Overview
Problem
Conventional venturi tube systems for gas-liquid mixing in waste gas treatment are prone to blockages due to solid particle deposition, require frequent maintenance, and have limited decontamination efficiency, leading to equipment damage and increased operational costs.
Innovation Solution
A self-cleaning negative-pressure ejector system with a suction chamber, jet pipe, flushing members, and air jet nozzles that generate high negative pressure and use inclined fluid flow and gas injection to prevent blockages, allowing for automatic cleaning and extended maintenance intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a venturi tube structure is used to increase gas-liquid mixing degree, then decontamination ability is improved, but solid particles deposit on the delivery tube causing blockages and requiring frequent maintenance
Solution Approach 1:
The system uses its own fluid flow to perform self-cleaning functions. The flushing member utilizes the process fluid itself to clean solid particles from the delivery tube, eliminating the need for external cleaning systems and enabling continuous operation without maintenance shutdowns.
Solution Approach 2:
The flushing member operates periodically to clean solid particles from the delivery tube. By controlling the flushing member to open and close at intervals, the system performs periodic cleaning cycles that prevent blockage accumulation while maintaining continuous gas-liquid mixing operation.
2Reliability
If the flexible tube is used to prevent blocking by disturbing solid dust, then blockage resistance is improved, but the tube breaks during long-time usage causing equipment damage
Solution Approach 1:
The invention removes the vulnerable flexible tube from the system entirely. Instead of relying on a flexible tube to disturb solid dust, the design uses a fixed delivery tube combined with a flushing member that actively removes particles, eliminating the weakness of flexible tube breakdown while maintaining blockage resistance.
Solution Approach 2:
The system replaces the mechanical flexible tube disturbance mechanism with a fluid-based flushing mechanism. The flushing member uses fluid flow to remove solid particles from the delivery tube, substituting a fragile mechanical component with a more durable fluid-based cleaning system.
3Productivity
If the tube wall is made small and path is made long to increase mixing, then decontamination ability is improved, but maintenance frequency increases and shutdown is required
Solution Approach 1:
The flushing member enables continuous cleaning action during operation. By integrating the flushing mechanism into the active delivery tube, the system can remove solid particles continuously without shutting down, maintaining both high decontamination ability and uninterrupted operation.
Solution Approach 2:
The system performs self-maintenance through the flushing member that cleans the delivery tube during operation. This self-cleaning capability eliminates the need for external maintenance intervention and shutdowns, allowing the system to maintain optimal performance continuously.
4Reliability
If multiple sets of spare equipment are kept for maintenance, then reliability is improved, but overall cost and system complexity increase
Solution Approach 1:
The single ejector unit performs self-maintenance through the flushing member, eliminating the need for multiple spare equipment sets. This self-sustaining capability maintains continuous operation reliability while keeping the system simple and cost-effective.
Solution Approach 2:
The delivery tube serves multiple functions: transporting the liquid stream and being cleaned by the flushing member. This multi-functionality eliminates the need for separate cleaning systems or multiple equipment sets, reducing overall system complexity while maintaining continuous operation capability.
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 effectively prevents blockages, maintains high decontamination efficiency, and reduces maintenance needs, ensuring continuous operation with reduced consumable costs and extended equipment lifespan.
Implementation Method 1
an exit port of the jet pipe being disposed in the suction chamber and ejecting a second fluid so that a negative pressure being generated in the suction chamber, and a first fluid in the first fluid pipeline obliquely entering the suction chamber
Implementation Method 2
the air jet nozzle injecting a gas into the first fluid pipeline along a tangential direction of the first fluid pipeline to generate a spiral airflow to remove the third fluid remaining in the first fluid pipeline during cleaning by the flushing member
Data Source
AI summary
A long-effect self-cleaning negative-pressure ejector at least comprises a suction chamber, a jet pipe and a flushing member. A side wall of the suction chamber has at least one suction port for communicating with a first fluid pipeline. An exit port of the jet pipe is disposed in the suction chamber and ejects a second fluid so that a negative pressure is generated in the suction chamber, a first fluid in the first fluid pipeline obliquely enters the suction chamber, and a first included angle is between a direction in which the first fluid being sucked into the suction chamber and an ejection direction of the second fluid. The flushing member optionally provides a third fluid to flush the suction chamber and/or the first fluid pipeline. At least one air jet nozzle is disposed on the first fluid pipeline to inject gas into the first fluid pipeline.