Heating Radiator Bottom Cap Design for Complete Coating Penetration
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Solution Overview
Problem
Existing heating radiator elements, particularly die-cast aluminum ones, face challenges in achieving complete anti-corrosion protection on their inner surfaces due to the formation of air pockets during painting and treatment processes, which prevents effective penetration of paint and results in unprotected inner chambers when immersed in a reversed position.
Innovation Solution
The design of a heating radiator element with a specific conformation of the bottom cap that prevents air pocket formation, allowing for complete treatment of all inner surfaces, combined with an electrochemical deposition process using polymeric coatings like epoxy or fluorinated resins to ensure comprehensive anti-corrosion protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If electrophoresis painting is used on radiator elements immersed in a reversed position, then the outer surfaces can be painted, but air pockets form in the bottom preventing complete penetration of paint to inner surfaces
Solution Approach 1:
The bottom cap is designed with an inverted conical shape where the smaller diameter is at the top and the larger diameter is at the bottom. This inverted geometry prevents air pockets from forming at the bottom when the element is immersed in the painting bath, allowing paint to completely penetrate and cover all inner surfaces including the bottom area.
Solution Approach 2:
The bottom cap incorporates a filter screen made of synthetic fibers with a specific mesh size (0.5-2.0 mm) integrated into its structure. This composite design combines the protective function of the cap with the filtering function, preventing corrosion particles from entering the inner chamber while maintaining the inverted geometry for complete paint penetration.
2Strength
If the inner chamber is left unpainted to maintain structural integrity, then the aluminium walls remain strong, but the inner surfaces are not protected against corrosion from aggressive water
Solution Approach 1:
The filter screen is strategically positioned at the bottom cap where corrosion particles would enter the inner chamber. This localized protection approach applies the filtering function specifically at the most critical entry point, allowing the rest of the aluminium structure to maintain its inherent strength and structural integrity without requiring complete internal painting.
Solution Approach 2:
The filter screen acts as an intermediary barrier between the external environment and the inner chamber. It intercepts and filters out corrosive particles before they can contact the aluminium inner surfaces, providing corrosion protection without requiring the inner chamber to be painted, thus preserving the structural integrity of the aluminium walls.
3Ease of manufacture
If the bottom cap is designed with a conventional flat shape, then manufacturing is simple, but air pockets form during treatment preventing complete penetration of protective coatings
Solution Approach 1:
The bottom cap uses an inverted conical shape instead of a flat design. This inverted geometry naturally guides the protective treatment solution to flow into and completely penetrate the bottom area, preventing air pocket formation. The inversion of the conventional shape solves the air pocket problem while remaining manufacturable using standard forming processes.
Solution Approach 2:
The bottom cap transitions from a two-dimensional flat surface to a three-dimensional inverted conical shape. This dimensional change creates a self-draining geometry where the treatment solution can flow along the sloped surfaces and completely wet the bottom area, eliminating air pockets and ensuring complete penetration of protective coatings throughout the inner chamber.
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
This solution enables complete anti-corrosion protection of all inner surfaces, allowing the radiator to function effectively even with aggressive water over long periods by ensuring thorough coverage and adhesion of protective coatings.
Implementation Method 1
The particular conformation of the bottom cap allows the formation of air pockets to be avoided precisely inside the bottom, when the element is immersed in a treatment composition
Implementation Method 2
an electrochemical deposition process using polymeric coatings like epoxy or fluorinated resins
Data Source
Figure 1
Figure 2~4
Figure 3
AI summary
A heating radiator element (1) has a body (2) made of die -cast aluminium and provided with an inner chamber (5) for water circulation, delimited by inner surfaces (6) of the aluminium body (2); the inner chamber (5) is entirely coated with a protective coating (51) made of an anti- corrosion polymeric coating material which protects in use the inner surfaces (6) of the aluminium body (2) against the contact with water; the body (2) has an end part (25) which extends beyond a pair of transversal coupling sleeves (9), connected to the chamber (5) by means of respective holes (29) delimited by peripheral edges (30), and having a bottom opening (27) closed by a cap (28); the cap (28) has a closing surface (33) arranged within the end part (25) very close to the holes (29) which connect the sleeves (9) to the chamber (5) and specifically substantially tangent to the holes (29).