Switcher Nozzle Flow Insert for High-Force Sewer Traction
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Solution Overview
Problem
Traction nozzles used in sewer pipes face a counterforce issue due to forward-directed jet tips, reducing the net pulling force and requiring a switching mechanism that doesn't generate counterforce, while also needing a simplified and maintainable nozzle assembly with minimal components.
Innovation Solution
A nozzle assembly with a switching valve assembly featuring a movable poppet, guide member, and bias member, which can be replaced by a high-efficiency flow insert to maximize jet force and coherence when switching functionality is not needed, allowing the nozzle body to withstand high pressures and simplify design and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If forward directed jet tips are used in traction nozzles, then the nozzle can effectively clean obstructions, but a counterforce is generated that hinders forward travel and reduces net pulling force
Solution Approach 1:
The nozzle employs a movable poppet valve that dynamically switches between two operational modes: during traction, the poppet closes forward-facing ports and opens rearward-facing ports to eliminate counterforce; during cleaning, the poppet opens forward-facing ports and closes rearward-facing ports to enable effective jetting. This dynamic reconfiguration resolves the contradiction by adapting the nozzle's flow direction to the current operational requirement.
Solution Approach 2:
The system changes the flow direction parameter by switching which ports are open or closed. The poppet valve alters the operational parameters of the nozzle by changing which jet tips are active (forward-facing or rearward-facing), thereby transforming the force characteristics from counterproductive during traction to effective during cleaning operations.
2Adaptability or versatility
If a switching valve assembly is incorporated to enable mode switching, then both traction and cleaning operations can be performed, but the nozzle assembly complexity increases
Solution Approach 1:
The switching valve assembly integrates multiple functions into a single compact mechanism. The poppet valve simultaneously controls flow to multiple ports, the bias member provides automatic reset functionality, and the guide member ensures proper alignment. This merging of functions into one assembly reduces overall complexity compared to using separate mechanisms for each function.
Solution Approach 2:
The poppet valve serves multiple functions: it acts as a flow director, a positioning element, and works in conjunction with the bias member and guide member to provide automatic switching capability. This multi-functionality reduces the need for additional separate components, thereby managing complexity while maintaining versatility.
3Adaptability or versatility
If a switching valve assembly with multiple components is used, then flow switching functionality is achieved, but maintenance difficulty and component count increase
Solution Approach 1:
The nozzle is designed as a modular assembly where the switching valve components (poppet, bias member, guide member) are distinct, separable parts captured within the nozzle body by the inlet nut. This segmentation allows individual components to be replaced or serviced independently, simplifying maintenance despite the presence of multiple parts.
Solution Approach 2:
The switching valve assembly can be extracted from the nozzle body as a unit or component-by-component for maintenance. The inlet nut serves as a common fastening point that secures all switching valve components, allowing them to be removed together or individually for inspection, repair, or replacement without requiring disassembly of the entire nozzle.
4Strength
If the nozzle body must withstand high operating pressures, then structural integrity is maintained, but the overall weight and material requirements increase
Solution Approach 1:
The switching valve assembly acts as an intermediary mechanism that allows the nozzle to achieve its full weight and material investment during cleaning operations when high pressure is needed, while during traction operations, the rearward-facing ports provide the necessary thrust without requiring the same level of structural reinforcement as continuously forward-facing ports would demand.
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 solution enhances the net pulling force by eliminating counterforce during traction and improves operational efficiency by simplifying the nozzle assembly, allowing for effective fluid jet operation and easy maintenance with minimal components.
Implementation Method 1
a bias member in the bore between the nozzle body and the poppet resiliently biasing the poppet toward the inlet nut
Implementation Method 2
These nozzles have forward directed jet tips and may also have laterally directed tips to ablate the obstructions encountered
Data Source
AI summary
A nozzle assembly includes a hollow nozzle body having a central bore and a plurality of ports extending through the body from the central bore; a switching valve assembly disposed in the central bore that directs fluid flow to ports upon application of fluid flow above a predetermined threshold to the inlet and direct fluid flow to different ports upon fluid flow having subsequently dropped below the predetermined threshold and then exceeding the predetermined threshold; and a flow insert configured to replace the switching valve assembly for directing flow through all of the ports when switching functionality is not needed. This flow insert may be made of a low pressure material such as a polymer.