Saddle Seal Assembly for High-Pressure Airless Spray Nozzles
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Solution Overview
Problem
Traditional high-pressure airless spray nozzle assemblies require precise machining for accurate fitting, leading to high costs, inefficiencies, and unreliable sealing, which affects atomization and service life due to torque and friction during cleaning.
Innovation Solution
A high-pressure airless spray nozzle design incorporating a spray tip guard, a spray tip, and a saddle seal assembly with a metal sealing sleeve and a cylindrical elastic seal, forming a combination of hard and flexible sealing structures to reduce manufacturing precision and extend service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If precise machining is used to form a metal-to-metal hard seal between spray tip and seal ring, then sealing reliability is improved, but manufacturing cost and complexity increase significantly
Solution Approach 1:
The patent introduces a flexible seal ring with a saddle-shaped sealing surface that can deform to adapt to the spray tip surface. This flexible sealing element replaces the need for precise metal-to-metal fitting, allowing for cost-effective manufacturing while maintaining reliable sealing through the elastic deformation capability of the flexible material.
2Reliability
If precise machining is used to form a metal-to-metal hard seal, then sealing performance is improved, but production efficiency decreases and costs increase
Solution Approach 1:
The flexible seal ring can be manufactured using simpler, more efficient processes such as molding or casting rather than precision machining. The flexible material's ability to deform and conform to the spray tip surface ensures effective sealing without requiring time-consuming precision machining operations, thereby improving production efficiency while maintaining sealing performance.
3Ease of operation
If the spray tip is reversed for internal cleaning between uses, then cleaning effectiveness is improved, but the fitted surfaces become scratched and cause matching gaps
Solution Approach 1:
The flexible seal ring can accommodate surface scratches and wear on the spray tip without compromising sealing effectiveness. Its elastic deformation capability allows it to maintain contact and seal around imperfect surfaces, ensuring that cleaning operations that may cause minor surface damage do not lead to matching gaps or sealing failures.
Solution Approach 2:
The flexible seal ring acts as a cushioning element that compensates for surface imperfections before they can cause sealing failures. By having this flexible intermediary in place, the system is pre-protected against the harmful effects of surface scratches and wear that occur during cleaning operations.
4Reliability
If metal-to-metal hard seal is used, then initial sealing is achieved, but service life is reduced due to torque and friction during cleaning
Solution Approach 1:
The flexible seal ring provides effective initial sealing through its elastic deformation and conformability to the spray tip surface. Additionally, its flexibility allows it to accommodate surface wear and scratches that occur during cleaning operations, maintaining sealing effectiveness throughout the service life and extending the overall durability of the spray nozzle assembly.
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 costs, and maintains effective sealing even after wear, allowing for tool-free operation and improved sealing performance.
Implementation Method 1
a cylindrical elastic seal (6) configured to be inserted into the metal sealing sleeve (5)... The cylindrical elastic seal (6)... forms an inner flexible sealing structure
Data Source
AI summary
A saddle seal assembly for a high-pressure airless spray nozzle having a spray tip includes a metal sealing sleeve and a cylindrical elastic seal. The metal sealing sleeve may include a first saddle-shaped semi-cylinder surface closely matching with an outer surface of the spray tip to form an outer hard sealing structure. The cylindrical elastic seal may include a second saddle-shaped semi-cylinder surface closely matching with the outer surface of the spray tip to form an inner flexible sealing structure. A first end portion of the cylindrical elastic seal is configured to be inserted into the metal sealing sleeve, and the first saddle-shaped semi-cylinder surface and the second saddle-shaped semi-cylinder surface are configured to be spliced to form a continuous saddle-shaped semi-cylinder surface, to thereby seal a stepped inlet hole of the high-pressure airless spray nozzle.