Spray Gun Filter With Conical Support Eliminates Spring
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Solution Overview
Problem
Existing spray gun filters have issues with filter residues remaining in the housing, requiring a spring for correct positioning, increased length due to dead space, and difficulty in removal when coating material hardens, leading to increased maintenance and force requirements.
Innovation Solution
A spray gun filter design with a filter fabric and support that eliminates the need for a spring, reduces length by removing dead space, and features a conical or open-ended filter support made from durable materials like polyamide or polypropylene, with a sleeve to prevent sticking and facilitate easy removal, and interconnected housing parts for easy cleaning and replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring is used to fix the spray gun filter in the filter housing, then the filter can be positioned correctly, but the device complexity increases and production costs increase
Solution Approach 1:
The spring component is completely removed from the filter assembly. Instead of using a spring to maintain contact between the filter support and filter housing, the invention relies on the pressure differential created during operation and the geometric design of the filter support to maintain proper positioning without any elastic elements.
Solution Approach 2:
The filter support is designed to automatically maintain contact with the filter housing through the pressure differential generated during filtration. The higher pressure on the upstream side of the filter fabric creates a self-acting force that presses the filter support against the housing, eliminating the need for external fixing mechanisms.
2Device complexity
If the spray gun filter includes a dead space at the upstream end, then the filter structure is simpler, but the overall length increases
Solution Approach 1:
The outlet openings are distributed over the length of the filter support rather than being concentrated at one end. This spatial distribution allows the filter to maintain structural integrity and proper flow distribution without requiring an extended dead space region, thereby reducing the overall axial length of the filter assembly.
3Strength
If the filter support has thick walls, then the structural strength is higher, but the pressure loss increases
Solution Approach 1:
The filter support walls are designed with locally optimized thickness rather than uniform thickness throughout. The wall thickness is adjusted based on the local structural requirements and flow conditions, providing sufficient strength where needed while minimizing obstruction to flow in critical regions, thereby reducing overall pressure loss.
4Strength
If coating material hardens in the filter housing, then the filter housing provides structural support, but the filter removal becomes difficult requiring tools
Solution Approach 1:
The conical geometry of the filter support creates a tapered interface with the filter housing that prevents material from bridging and hardening in a way that would lock the filter in place. The converging shape toward the outlet end provides a natural release point, allowing the filter to be removed by simple pulling forces without requiring tools to break hardened material bonds.
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 solution extends the service life of the filter, reduces pressure loss, minimizes maintenance, and allows for easier handling and disassembly, with reduced force required for removal and no need for tools, while maintaining high-pressure resistance and cost-effectiveness.
Implementation Method 1
a filter fabric and a filter support, which has outlet openings for the liquid and which surrounds the filter fabric from the outside
Implementation Method 2
the filter support is externally conical. It can thus be removed more easily from the spray gun
Data Source
AI summary
The spray gun filter according to the invention for filtering liquid comprises a filter fabric and a filter support, which has outlet openings for the liquid and which surrounds the filter fabric from the outside.