Rotary Jet Nozzle Balancing for Vibration and Speed Control

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Solution Overview

Problem

Existing rotary jet nozzle assemblies in pressure cleaning devices suffer from mechanical oscillations and vibrations, leading to discomfort and noise for operators, and inefficiencies at high pressures due to nebulization and imbalance of rotating elements.

Innovation Solution

A rotary jet nozzle assembly with a counterweight eccentrically positioned to balance the nozzle body, using a polymeric support and metallic counterweight, combined with a turbine and dual passages to control rotation speed and reduce nebulization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If a rotary jet nozzle assembly is used to deliver washing liquid to a larger surface, then the cleaning coverage is improved, but mechanical oscillations and vibrations occur at high pressures

Engineering Contradiction:
Improvecleaning coverageVSAvoidvibrations
Core Design Contradiction:
Area of stationary objectVSObject-affected harmful factors

Solution Approach 1:

A counterweight element is integrated into the rotor assembly, positioned eccentrically opposite to the nozzle body relative to the rotation axis. This counterweight has a mass and position specifically designed to balance the rotor dynamically during rotation, canceling out the vibrations and mechanical oscillations that would otherwise be transmitted to the handling tool and operator.

Inventive Principle:
Principle #8Anti-weight (Counterweight)

2Productivity

If the nozzle body is driven at high rotation speed to cover larger area, then the cleaning efficiency is improved, but nebulization effect occurs reducing jet impact force

Engineering Contradiction:
Improvecleaning efficiencyVSAvoidjet impact force
Core Design Contradiction:
ProductivityVSForce

Solution Approach 1:

The system allows dynamic adjustment of the rotation speed parameter based on operating conditions. By controlling the rotation speed to remain below a critical threshold, the design prevents the nebulization effect that would otherwise occur at excessively high speeds, thereby maintaining sufficient jet impact force for effective cleaning while still achieving coverage of larger surfaces through the rotary motion.

Inventive Principle:
Principle #35Parameter changes

3Object-affected harmful factors

If damping systems are applied to reduce vibrations, then the operator comfort is improved, but the structural complexity and production costs increase

Engineering Contradiction:
Improveoperator comfortVSAvoidstructural complexity
Core Design Contradiction:
Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

Instead of adding complex damping systems to reduce vibrations, the invention uses a counterweight element integrated into the rotor assembly. This passive balancing approach eliminates vibrations at the source by dynamically balancing the rotating mass, thereby improving operator comfort without increasing structural complexity or production costs.

Inventive Principle:
Principle #8Anti-weight (Counterweight)

4Ease of operation

If the nozzle assembly is designed to start easily at low pressures, then the ease of operation is improved, but the rotation speed increases excessively at high pressures

Engineering Contradiction:
Improveease of startingVSAvoidrotation speed
Core Design Contradiction:
Ease of operationVSSpeed

Solution Approach 1:

The design incorporates a rotation speed control mechanism that adapts the operational parameters based on the input pressure. At low pressures, the system is designed to start easily with minimal resistance. As pressure increases, the control mechanism adjusts to prevent excessive rotation speed by maintaining a threshold below which the nozzle operates, thereby preventing nebulization while ensuring easy starting at low pressures.

Inventive Principle:
Principle #35Parameter changes

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 assembly significantly reduces vibrations and noise, enhances user comfort, and maintains cleaning efficiency by balancing the rotor and controlling rotation speed, even at high pressures.

Implementation Method 1

a counterweight, integral with the support and arranged in a position which is eccentric and opposite the nozzle body with respect to the first longitudinal axis, to balance the nozzle body during the rotation of the support about the first longitudinal axis

Methodology Applied
Scientific EffectCounterweight balancing: Balance

Implementation Method 2

a support rotating within the containment chamber and about the first longitudinal axis due to the effect of the washing liquid coming from the inlet

Methodology Applied
Scientific EffectFluid thrust: Fluid Spray

Data Source

PatentEP3646953B2Rotary jet nozzle assembly for pressure cleaning devices
Publication Date: 2026.03.25 P A SPA
  • EP3646953B2 patent drawingFigure 1
  • EP3646953B2 patent drawingFigure 2
  • EP3646953B2 patent drawingFigure 3

AI summary

Rotary jet nozzle assembly (1) for pressure cleaning devices, comprising: a housing (2) extended along a first longitudinal axis (X) between an inlet (3) and an outlet (4) of a washing liquid, defining therein a containment chamber (5) of the washing liquid in fluid communication with the inlet (3); a support (10) rotatable within said containment chamber (5) and about the first longitudinal axis (X) due to the effect of the washing liquid coming from the inlet (3); a nozzle body (20) extended along a second longitudinal axis (Y) inclined with respect to the first longitudinal axis (X) and traversed by a delivery duct (28), the nozzle body (20) being associated with the support (10) and driven in rotation thereby; and a counterweight, integral with the support (10) and arranged in a position that is eccentric and opposite the nozzle body (20) with respect to the first longitudinal axis (X).