Rotating Nozzle Frusto-Conical Wall Reduces Seat Force
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Solution Overview
Problem
Existing rotating nozzles for high-pressure cleaning devices face challenges in production efficiency and material removal during manufacturing, as well as excessive forces between the nozzle member and the nozzle house during operation, which can lead to disintegration of the fluid jet due to rotational velocity.
Innovation Solution
A rotating nozzle design featuring a frusto-conical nozzle house chamber and a tubular nozzle member with a cylindrical rolling surface, allowing for easier core removal during casting or machining and reducing reaction forces by directing them away from the nozzle member, thus minimizing friction and maintaining fluid jet integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the nozzle house chamber is cylindrical, then the production process requires complex core removal during casting or machining, but changing to frusto-conical geometry improves ease of manufacture and core removal
Solution Approach 1:
The patent applies asymmetry by changing the nozzle house chamber from a symmetric cylindrical shape to an asymmetric frusto-conical shape. This asymmetric geometry allows the core to be easily pulled out during casting or machining, as the conical walls provide a natural extraction path that reduces manufacturing complexity and improves ease of production.
2Reliability
If the reaction force between nozzle member and nozzle house is directed towards the seat, then the nozzle member is firmly positioned, but this increases the force on the seat and can lead to disintegration of the fluid jet
Solution Approach 1:
The patent applies the counterweight principle by designing the frusto-conical wall section to redirect the reaction force between the nozzle member and nozzle house. The conical geometry is specifically configured so that the reaction force has a component that opposes the pressure force pushing the nozzle member towards the seat, thereby reducing the net force on the seat and preventing fluid jet disintegration while maintaining reliable nozzle member positioning.
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 design enhances production efficiency, reduces material removal difficulties, and minimizes operational forces, ensuring a stable and intact fluid jet is maintained during high-pressure cleaning operations.
Implementation Method 1
having the reaction force between the nozzle member and the nozzle house directed with a component in a direction reducing the force provide by the pressure in the nozzle house towards the seat in which the nozzle member is positioned during operation
Implementation Method 2
The rotational velocity of the nozzle member about its longitudinal axis is controlled by the frictional force between the surface of the frusto-conical portion of the nozzle member and the corresponding cylindrical portion of the inner wall of the nozzle house chamber
Data Source
AI summary
The present invention relates to a rotating nozzle (1) for high-pressure cleaning device comprising a nozzle house (2) provided with a fluid exit opening comprising a seat (4) cooperating with a first end portion (8) of a nozzle member (3) such that the nozzle member (3) can undergo a pivotal and rotational movement relative to a longitudinal axis (9) through the nozzle house. At least one fluid inlet (5) to the nozzle house (2) provides a rotational movement of the fluid in said nozzle house (2). The nozzle house (2) comprises a frusto-conical wall section (6), and said nozzle member (3) comprises a rolling surface (7), said rolling surface (7) of the nozzle member (3) rolling on said frusto-conical wall section (6) and rests on the latter along its generatrix. The frusto-conical formation of the nozzle house chamber (13) is advantageous with regard to the production process, in which the nozzle house is cast or produced by cutting by stock removal. Furthermore, the forces between the seat (4) of the nozzle house (2) and the corresponding end portion of the nozzle member are reduced due to the reaction forces between the frusto-conical wall section (6) and the rolling surface (7).