Switcher Nozzle Flow Insert for Traction Jet Force
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Solution Overview
Problem
Traction nozzles used in sewer pipelines and other piping systems face a counterforce issue due to forward-directed jet tips, which hinders the effective deployment of high-pressure hoses and reduces the net pulling force. Additionally, existing nozzle assemblies are complex and difficult to maintain, and they often require a functioning switching valve, which may not be necessary in all situations.
Innovation Solution
A nozzle assembly with a switching valve assembly that includes a movable poppet, a guide member, and a bias member, which directs fluid flow to different ports based on pressure thresholds. This assembly can be replaced with a high-efficiency flow insert when switching functionality is not needed, maximizing jet force and coherence without the need to withstand high pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a switching valve assembly is incorporated into the nozzle to enable flow direction control, then the nozzle can switch between traction mode and cleaning mode, but the device complexity increases and maintenance difficulty increases
Solution Approach 1:
The nozzle assembly is divided into modular components: a removable flow insert that can be extracted from the nozzle body, allowing the switching valve assembly to be replaced with a simple flow insert when switching capability is not needed. This segmentation reduces overall system complexity while maintaining adaptability when required.
Solution Approach 2:
The flow insert serves multiple functions: it can be a simple cylindrical piece for straight-through flow, or it can be replaced with a switching valve assembly that provides both traction mode and cleaning mode operation. The same structural location accommodates both simple and complex configurations based on operational needs.
2Adaptability or versatility
If a switching valve assembly is used to direct fluid flow to different ports, then the nozzle can perform both traction and cleaning functions, but the number of component parts increases and maintenance becomes more difficult
Solution Approach 1:
The switching valve assembly is designed as a removable unit that can be easily extracted from the nozzle body through the open end, allowing for simple replacement and maintenance without disassembling the entire nozzle. The flow insert can be removed and replaced in a similar straightforward manner.
Solution Approach 2:
The flow insert is designed as a simple, inexpensive component that can be easily replaced if worn or damaged. Rather than maintaining a complex switching valve assembly, users can opt for the simpler, lower-cost flow insert that provides sufficient functionality for many applications.
3Productivity
If forward directed jet tips are used in the nozzle, 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 allows dynamic adjustment of jet direction based on operational needs. During traction operations, the flow is directed rearward to maximize pulling force. When cleaning is required, the flow can be switched to forward-directed tips to provide effective obstruction removal, optimizing performance for each specific task.
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 effectively addresses the counterforce issue by optimizing fluid flow and reducing complexity, enhancing the efficiency of high-pressure hose deployment and simplifying maintenance. The use of a flow insert further improves jet force and coherence without the need for high-pressure resistance.
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
direct fluid flow from an inlet to the rear portion to at least one of the plurality of ports upon application of fluid flow above a predetermined threshold to the inlet
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.