Reaction Force Nozzle Grooves Reduce Leakage
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Solution Overview
Problem
Existing water jet nozzles for cleaning heat exchanger tubes suffer from high leakage rates and blockages due to particulate material accumulation, leading to inefficiency and potential damage from high-pressure water jets.
Innovation Solution
A nozzle design featuring a shaft with grooves on its exterior surface, which creates turbulence between the shaft and sleeve, reducing leakage and trapping particulate material, along with a conical section for breaking up blockages, enhances the nozzle's efficiency and reduces the risk of blockages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If water is delivered to the nozzle under extremely high pressure to effectively clean heat exchanger tubes, then cleaning effectiveness is improved, but water leakage from the rotating sleeve increases significantly
Solution Approach 1:
The shaft is segmented with multiple grooves (first groove, second groove, third groove) that divide the water flow path. This segmentation creates multiple turbulence zones that collectively reduce water leakage while maintaining cleaning effectiveness. The grooves break the continuous water flow into segmented paths, reducing overall leakage through the rotating sleeve assembly.
Solution Approach 2:
The grooves on the shaft create turbulence in the water flow, which acts as a form of mechanical disturbance. This turbulence disrupts the smooth flow of water between the shaft and rotating sleeve, reducing leakage. The turbulent flow pattern creates eddies and mixing that impede the straightforward passage of water through the rotating assembly.
2Duration of action of moving object
If the nozzle operates for extended periods to thoroughly clean heat exchanger tubes, then cleaning completeness is improved, but particulate material accumulates between the rotating sleeve and stationary part, hindering rotation
Solution Approach 1:
The grooves on the shaft extract and trap particulate material from the water flow. By providing designated pathways (grooves) that capture solids, the invention prevents particulates from accumulating in the critical interface between the rotating sleeve and stationary shaft. The grooves act as traps that remove harmful particulates from the rotation interface, maintaining reliable operation over extended cleaning durations.
Solution Approach 2:
The grooves serve as an intermediary structure between the water flow and the rotating sleeve assembly. They mediate the interaction by providing a controlled pathway that manages both water flow and particulate material. The grooves intercept particulates before they can reach the rotating interface, acting as a protective intermediary that maintains rotation reliability.
3Loss of substance
If the shaft and sleeve fit tightly to minimize water leakage, then leakage is reduced, but particulate material more easily becomes trapped and blocks rotation
Solution Approach 1:
The shaft features localized grooves at specific positions along its length. These grooves create localized turbulence zones and particulate trapping areas without affecting the overall tight fit between the shaft and rotating sleeve. The local quality modification (adding grooves) addresses both leakage and rotation issues by creating specific functional zones that manage water flow and particulate material while maintaining the general tight clearance design.
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 achieves significant reduction in leakage rates and effectively clears blockages within heat exchanger tubes, maintaining efficiency and preventing damage from high-pressure water jets.
Implementation Method 1
The grooves create turbulence in water that moves into a space between the shaft and the sleeve and slows leakage from the nozzle
Data Source
AI summary
A nozzle for water jet equipment and a method of use thereof. The nozzle has a body including a base with a shaft extending outwardly therefrom. The shaft is inserted through a bore of a sleeve that rotatable about the shaft. The base and shaft define a bore therein. At least one opening is defined in the shaft and one or more grooves are milled into the shaft's exterior surface. Each opening places the body's bore in fluid communication with one of the grooves and the sleeve's bore. Water flowing through the body's bore will flow through each opening, into the associated groove and into a space between the shaft and sleeve. The grooves create turbulence in water in this space and thereby reduce leakage from the nozzle. The shaft terminates in a conical section usable as a battering ram to break up blockages in pipes during cleaning operations.