Glass-Lined Steel Tank Smooth Transition Eliminating Corrosion
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Solution Overview
Problem
The existing methods for constructing inner tanks of hot water heaters often result in sharp transition areas that hinder the adhesion of glass linings, leading to corrosion and reduced life expectancy due to exposed metal surfaces.
Innovation Solution
A method involving the formation of a cylindrical steel shell with a smooth angulated surface at the transition zones between the top dome and cylindrical shells, followed by sandblasting and application of porcelain enamel to ensure a uniform glass lining density, eliminating abrupt edges and enhancing adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional welding methods are used to join the top dome shell and cylindrical shell, then the manufacturing process is simple, but sharp transition areas are created that cause glass lining defects and corrosion
Solution Approach 1:
The patent applies curvature by replacing the sharp angular transition between the top dome shell and cylindrical shell with a smooth curved transition zone. This curved geometry eliminates the abrupt edge that causes glass lining defects, allowing the glass lining to form with substantially constant density throughout the transition area, thereby preventing corrosion at this critical junction.
Solution Approach 2:
The patent changes the geometric parameters of the transition area by specifying precise angular relationships (e.g., the curved transition zone creating specific angles with the horizontal and vertical surfaces). This parameter optimization ensures that the glass lining can flow and solidify uniformly without trapped air or stress concentrations, achieving consistent density and eliminating corrosion-prone defects.
2Reliability
If non-corrosive polymer materials are used for the inner tank, then corrosion is prevented and steel用量 is reduced, but the solution creates other efficiency problems
Solution Approach 1:
The patent employs a composite material system consisting of steel shells with an inner glass lining coating. This composite structure combines the structural strength and thermal conductivity of steel with the corrosion resistance of glass, eliminating the need for polymer linings while maintaining both reliability and productivity. The glass-lined steel tank achieves superior corrosion protection without compromising heating efficiency.
3Reliability
If sacrificial anode is used for corrosion protection, then exposed metal surfaces are protected, but the anode deteriorates faster when metal exposure is increased
Solution Approach 1:
The patent extracts the corrosion protection function from the sacrificial anode system by implementing a glass lining that provides inherent corrosion resistance to the entire inner surface. This eliminates the need for sacrificial anodes or reduces their role to only protecting exposed metal surfaces, thereby extending the overall system life and reducing maintenance requirements.
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 approach significantly reduces oxidation and extends the life expectancy of the tank and the sacrificial anode, thereby reducing maintenance and replacement costs.
Implementation Method 1
The inner surface of the press-fitted top dome shell and the inner surface of the cylindrical steel shell is then sand-blasted
Implementation Method 2
The porcelain enamel is heated to fuse same on the inner surface of the press-fitted top dome shell and the cylindrical steel shell
Implementation Method 3
The top dome shell is press-fitted inside a top end portion of the cylindrical steel shell with the marginal section of the outer surface of the top dome shell in tight frictional contact with an inner surface of the top end of the cylindrical steel shell
Data Source
AI summary
A method of constructing an inner glass-lined steel tank is described. The lower edge of the top dome shell is machined wherein a smooth angulated surface is formed between an outer and an inner surface of the top dome shell to form a smooth angulated surface to eliminate abrupt transition edges. Also, couplings are machined and press-fitted into the tank wall to form smooth surfaces with the inner surface of the tank. When the porcelain enamel is sprayed inside the tank there are no sharp edges which often results in defects due to the fact that the porcelain enamel is not properly adhered thereto. Such defects eventually cause corrosion within the inner tank and greatly reduce the life expectancy thereof as well as the life expectancy of the sacrificial anode connected to the tank and extending therein.