Switcher Nozzle Flow Insert for Counterforce-Free Sewer Traction
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Solution Overview
Problem
Traction nozzles used in sewer piping systems face a counterforce issue due to forward-directed jet tips, which hinder the effective deployment of high-pressure hoses and complicate maintenance, necessitating a switching mechanism that eliminates counterforces while maintaining efficient fluid jet operation.
Innovation Solution
A nozzle assembly with a switching valve assembly featuring a movable poppet, guide member, and bias member, along with a high-efficiency flow insert that replaces the valve assembly when switching is not needed, allowing for fluid flow directionality and maximizing jet force without requiring high-pressure resistance.
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 hose deployment and reduces net pulling force
Solution Approach 1:
The nozzle incorporates a switching mechanism that dynamically changes the direction of fluid jets based on operational mode. During traction operation, jets are directed rearward to generate thrust without counterforce. During cleaning operation, jets are directed forward to maximize cleaning effectiveness. This dynamic reconfiguration resolves the contradiction between cleaning effectiveness and net pulling force.
Solution Approach 2:
The nozzle changes the directional parameter of fluid jet output based on operational requirements. By switching between forward-directed jets (for cleaning) and rearward-directed jets (for traction without counterforce), the system optimizes performance for each specific task, eliminating the need to compromise between conflicting performance requirements.
2Force
If a switching valve assembly is incorporated to eliminate counterforce, then net pulling force is improved, but device complexity and maintenance requirements increase
Solution Approach 1:
The switching valve assembly is designed as a modular, replaceable component separate from the main nozzle body. This segmentation allows the complex switching mechanism to be independently manufactured, tested, and replaced without affecting the entire nozzle assembly, thereby managing complexity through modularity.
Solution Approach 2:
The switching valve assembly serves multiple functions: it directs fluid jets during cleaning operations, generates thrust during traction operations, and eliminates counterforce. By consolidating these multiple functions into a single modular component, the overall device complexity is managed more effectively than if separate components were required for each function.
3Adaptability or versatility
If a switching valve assembly is used to facilitate both traction and cleaning operations, then operational versatility is improved, but the number of component parts and maintenance complexity increase
Solution Approach 1:
The switching valve assembly is designed as a self-contained modular unit that can be quickly removed and replaced. This segmentation isolates the complex multi-functional component, allowing maintenance personnel to service or replace only the valve assembly without disassembling the entire nozzle, thereby simplifying maintenance despite the component's multiple functions.
Solution Approach 2:
The modular switching valve assembly can be designed as a replaceable component that is economically manufactured and quickly replaced when worn or damaged. This approach is more economical and simpler than attempting to repair complex internal valve mechanisms, aligning with the principle of replacing rather than repairing complex components.
4Force
If a high efficiency flow insert is used instead of a switching valve, then jet force and coherence are maximized, but the ability to switch between traction and cleaning modes is lost
Solution Approach 1:
The system uses a flow insert optimized for maximum jet force and coherence during cleaning operations, while a switching mechanism dynamically redirects fluid flow to generate rearward thrust during traction operations. This dynamic flow control allows the system to achieve both maximum cleaning effectiveness and effective traction capability without compromising jet force.
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 nozzle assembly enhances the net pulling force and operational efficiency by eliminating counterforces and simplifying design and maintenance, while the flow insert ensures maximum fluid jet coherence and cohesiveness without needing to withstand high pressures.
Implementation Method 1
a bias member in the bore between the nozzle head body and the poppet resiliently biasing the poppet toward the inlet nut
Implementation Method 2
These traction nozzles have jet tips oriented at an angle rearward in order to generate thrust in the nozzle within the pipe to assist in pulling the hose through
Implementation Method 3
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.