Rotating Fluid Nozzle Axial Force Balancing
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Solution Overview
Problem
Existing high-pressure water jet nozzles for tube cleaning face challenges in balancing the forces generated by the high-pressure water, leading to instability and reduced cleaning efficiency when encountering obstructions.
Innovation Solution
A rotating fluid nozzle design featuring a stationary housing with a rotating member, including a central passage for high-pressure fluid communication, a forward fluid pressure chamber, a rear fluid pressure chamber, and an annular restriction, which balances forces by allowing fluid leakage to the atmosphere, eliminating the need for mechanical bearings and maintaining pressure when encountering obstructions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high pressure water is jetted outwardly from nozzle openings to clean the tube interior, then cleaning effectiveness is improved, but axial forces on the shaft increase causing instability
Solution Approach 1:
A counterbalancing chamber is provided in the shaft that receives high pressure water and directs it against a counterbalancing surface. This creates a counterbalancing force that offsets the axial forces generated by the forwardly directed nozzles, thereby stabilizing the shaft during operation while maintaining effective cleaning.
Solution Approach 2:
The shaft is segmented into functional zones: a forwardly directed nozzle section for cleaning, a counterbalancing chamber section for force offsetting, and a leakage path section for pressure management. This segmentation allows each zone to perform its specific function independently, resolving the contradiction between cleaning effectiveness and shaft stability.
2Stability of the object's composition
If the shaft moves axially forward to counterbalance forces, then force balance is improved, but pressure is lost when encountering obstructions
Solution Approach 1:
The shaft is designed to move dynamically along the tube interior, with the counterbalancing chamber volume adjusting as the shaft position changes. When the shaft encounters an obstruction and moves forward, the counterbalancing chamber volume decreases, automatically maintaining pressure balance and preventing pressure loss, thereby ensuring reliable operation.
Solution Approach 2:
The volume of the counterbalancing chamber is designed to change as a parameter in response to shaft position. As the shaft moves axially forward or backward, the chamber volume adjusts accordingly, maintaining optimal pressure balance and force equilibrium throughout the cleaning operation, even when encountering obstructions.
3Reliability
If mechanical bearings are used to support the rotating shaft, then rotational support is improved, but complexity and maintenance requirements increase
Solution Approach 1:
Traditional mechanical bearings are replaced with a fluid dynamic support system. High pressure water leaks axially between the shaft and housing through controlled leakage paths, creating a fluid film that supports and stabilizes the rotating shaft without mechanical contact. This substitution eliminates mechanical bearings and their associated complexity and maintenance requirements.
Solution Approach 2:
The shaft support system uses hydraulic principles, where high pressure water flowing through leakage paths creates a pressurized fluid film between the shaft outer peripheral surface and the housing inner peripheral surface. This fluid film provides bearing support, enabling smooth rotation without mechanical contact points, thereby reducing complexity and maintenance needs.
4Stability of the object's composition
If the restriction volume decreases when shaft moves forward, then force balancing is improved, but fluid flow control becomes more critical
Solution Approach 1:
The restriction geometry is designed to automatically adjust fluid flow based on shaft position. As the shaft moves forward or backward, the restriction volume changes self-regulating the fluid flow and pressure to maintain force balance. This self-service mechanism eliminates the need for external control systems, keeping the device simple while achieving precise force balancing.
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 effectively balances axial forces, maintains cleaning power, and ensures continuous rotation even when encountering obstructions, enhancing the stability and efficiency of the tube cleaning process.
Implementation Method 1
A source of high pressure water is generally connected to the nozzle and jets outwardly from nozzle openings at a forward end of the nozzle, causing the nozzle to rotate. The jetting fluid impacts against an interior surface, cleaning the tube.
Implementation Method 2
A source of high pressure water is generally connected to the nozzle and jets outwardly from nozzle openings at a forward end of the nozzle, causing the nozzle to rotate.
Implementation Method 3
A rear fluid pressure chamber may be defined between the shaft and the housing and a restriction may be defined between the housing and the inlet end of the shaft, the restriction configured to receive fluid from the rear fluid pressure chamber and transport it to a chamber communicating with the atmosphere.
Implementation Method 4
The outer peripheral surface of the shaft and the housing may further define forward and rearward leakage paths extending from the forward fluid pressure chamber to allow fluid to flow to the atmosphere.
Implementation Method 5
The rear fluid pressure chamber may be configured to receive water that has leaked between the stem and the inlet end of the shaft and transport it to opposing thrust surfaces on the housing and the shaft, thereby applying a forward force to at least partially balance a rearward force generated by the forward fluid pressure chamber.
Data Source
AI summary
A nozzle for use in a high pressure water jetting system is provided including a stationary housing, a rotating shaft, and a central passage within the shaft for communicating high pressure fluid to the nozzle. The shaft may include communication passages to provide fluid from the central passage to a forward fluid pressure chamber defined between an outer peripheral surface of the shaft and the housing. A rear fluid pressure chamber may be defined between the shaft and the housing and a restriction may be defined between the housing and the inlet end of the shaft, the restriction configured to receive fluid from the rear fluid pressure chamber and transport it to a chamber communicating with the atmosphere. The restriction may be formed as an annular gap between the housing and the inlet end of the shaft and configured to decrease in volume when the shaft moves axially forward.