Spray Tip Turbulation Chamber for Uniform Atomization

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Solution Overview

Problem

Existing fluid spraying systems face challenges in achieving uniform spray patterns and mechanical durability, particularly at lower pressures, due to limitations in fluid shearing and turbulation within the spray tip design.

Innovation Solution

A spray tip assembly featuring an upstream and downstream chamber piece with a turbulation chamber, where the upstream chamber piece is press-fitted into the cylindrical body, creating a strong interference fit and facilitating fluid shearing and improved mechanical properties, and the turbulation chamber enhances atomization and spray fan development through geometric features like aperture orifices and tapered portions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If conventional spray tip designs are used, then the structure is simple and easy to manufacture, but uniform spray patterns cannot be achieved at lower pressures due to insufficient fluid shearing and turbulation

Engineering Contradiction:
Improvespray pattern uniformityVSAvoidspray tip structure
Core Design Contradiction:
Manufacturing precisionVSDevice complexity

Solution Approach 1:

The spray tip is divided into multiple functional segments: an upstream chamber piece, a downstream chamber piece, and a turbulation chamber. This segmentation allows each component to perform a specific function (fluid intake, turbulation generation, and spray output) that collectively achieves uniform spray patterns at lower pressures through controlled fluid shearing and turbulation.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The turbulation chamber introduces localized geometric features (such as tapered portions and aperture orifices) that create specific flow conditions only in the regions where they are needed. These local modifications generate fluid shearing and turbulation effects precisely where required to improve spray pattern uniformity without complicating the entire structure.

Inventive Principle:
Principle #3Local quality

2Reliability

If conventional spray tip designs are used, then the structure is simple, but mechanical durability and service life are reduced due to wear and tear

Engineering Contradiction:
Improvemechanical durabilityVSAvoidassembly structure
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

By segmenting the spray tip into removable chamber pieces, the design allows individual components to be inspected, maintained, and replaced independently. This segmentation improves mechanical durability by enabling targeted repair of worn sections without replacing the entire assembly, thereby extending service life while maintaining a relatively simple overall structure.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The press-fit connection between chamber pieces creates a robust mechanical joint that anticipates and resists wear and tear during operation. This pre-engineered connection method provides mechanical cushioning against operational stresses, enhancing durability before wear becomes problematic.

Inventive Principle:
Principle #11Beforehand cushioning (Prior cushioning)

3Manufacturing precision

If conventional spray tip designs are used, then manufacturing is straightforward, but spray fan development is limited due to insufficient fluid shearing

Engineering Contradiction:
Improvespray fan developmentVSAvoidassembly process
Core Design Contradiction:
Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The turbulation chamber incorporates localized geometric features (tapered portions, aperture orifices) that generate the necessary fluid shearing and spray fan development. These local modifications are designed to be manufacturable using standard machining processes, achieving improved spray fan development without significantly complicating the overall manufacturing process.

Inventive Principle:
Principle #3Local quality

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 improves fluid shearing and spray fan development, enabling more uniform spray patterns at lower pressures, reducing wear and tear, and extending the service life of the spray tip while allowing for easy assembly and alignment.

Implementation Method 1

The spray outlet piece includes an outlet aperture configured to atomize a spray fluid

Methodology Applied
Scientific EffectAtomization:

Implementation Method 2

a turbulation chamber defined by the spray outlet piece and the upstream chamber piece

Methodology Applied
Scientific EffectTurbulence: Turbulence

Implementation Method 3

The upstream and downstream pieces further define a turbulation chamber. These features help improve fluid shearing and spray fan development

Methodology Applied
Scientific EffectFluid shearing: Shear Stress

Implementation Method 4

the upstream chamber piece is press-fitted into the cylindrical body, creating a strong interference fit

Methodology Applied
Scientific EffectInterference fit:

Data Source

PatentUS11865559B2Spray tip
Publication Date: 2024.01.09 GRACO MINNESTOA INC
  • US11865559B2 patent drawing
  • US11865559B2 patent drawing
  • US11865559B2 patent drawing

AI summary

A spray tip includes a cylindrical body having a through hole oriented along a fluid flow axis, and a spray outlet piece and upstream chamber piece located in the through hole. The spray outlet piece includes an outlet aperture configured to atomize a spray fluid. The upstream chamber piece includes an internal aperture wall with an upstream surface and a downstream surface, and an aperture through the wall. The aperture includes an inlet orifice and an outlet orifice. The spray tip further includes a turbulation chamber defined by the spray outlet piece and the upstream chamber piece.