Corrugated Pipe End Sealing Against Galvanic Corrosion
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Solution Overview
Problem
Existing corrugated stainless steel pipe connection devices fail to effectively prevent galvanic corrosion at the expansion portion due to inadequate insulation from dissimilar metal parts, leading to potential water leaks and corrosion.
Innovation Solution
A corrugated pipe connection device that surrounds the straight and expansion portions of a corrugated stainless steel pipe with silicone packing, ensuring insulation from dissimilar metal parts through a combination of a metal connection member, synthetic resin sleeve, and silicone packing components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a synthetic resin sleeve with a flange is used to insulate the expansion portion from dissimilar metal products, then galvanic corrosion prevention is improved, but water tightness between the flange and dissimilar metal products deteriorates
Solution Approach 1:
A silicone packing member is introduced as an intermediary component between the synthetic resin sleeve flange and the dissimilar metal product. This silicone packing member has elasticity and can deform to fill gaps and ensure water tightness while maintaining the electrical insulation function, thus resolving the contradiction between corrosion prevention and water tightness.
Solution Approach 2:
The connection device uses a composite structure combining synthetic resin (for insulation) with silicone packing material (for water tightness and elasticity). This composite approach allows both functions - galvanic corrosion prevention through insulation and water tightness through the elastic sealing property of silicone - to be achieved simultaneously.
2Device complexity
If the expansion portion is left exposed without insulation, then device complexity is reduced, but galvanic corrosion resistance deteriorates
Solution Approach 1:
The silicone packing member is inserted into the expansion portion of the corrugated stainless steel pipe, nesting the insulation function within the existing pipe structure. The synthetic resin sleeve with flange is then fitted over the pipe end, creating a nested configuration that provides corrosion protection without adding excessive external complexity.
Solution Approach 2:
The silicone packing member acts as a flexible insulating layer within the expansion portion. Its flexibility allows it to conform to the corrugated pipe's shape while providing electrical insulation, thus protecting against galvanic corrosion with minimal structural addition.
3Reliability
If a rigid insulation structure is used to prevent galvanic corrosion, then corrosion resistance is improved, but adaptability to different pipe configurations deteriorates
Solution Approach 1:
The silicone packing member is made elastic and dynamic rather than rigid. It can deform and adapt to different pipe configurations, diameters, and expansion portion shapes while maintaining continuous electrical insulation. This dynamic property allows the same insulation structure to work with various pipe types and connection configurations.
Solution Approach 2:
The insulation system uses materials with appropriate physical parameters - the silicone packing member has specific elasticity and compressibility parameters that allow it to adapt to different configurations. By selecting materials with suitable parameter ranges, the system achieves both corrosion resistance and adaptability to various pipe arrangements.
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 device effectively prevents galvanic corrosion by ensuring electrical insulation of the expansion portion from dissimilar metal parts, while maintaining water tightness and structural integrity.
Implementation Method 1
a silicone packing having a ring portion coming into contact with the expansion portion, a protrusion portion protruding inwardly from the inner periphery of the ring portion to be inserted to the inside the straight pipe portion, and an insertion portion formed on the outer periphery thereof to surround the expansion portion therewith
Data Source
AI summary
A corrugated pipe connection device including: a corrugated stainless steel pipe; a straight pipe portion formed on each end of the corrugated stainless steel pipe; a connection member made of a metal and fitted to the outer periphery of the straight pipe portion; a synthetic resin sleeve fitted to the outer periphery of the straight pipe portion and having a flange; an expansion portion expanded from the end of the straight pipe portion; and a silicone packing having a ring portion coming into contact with the expansion portion, a protrusion portion protruding inwardly from the inner periphery of the ring portion to be inserted to the inside the straight pipe portion, and an insertion portion formed on the outer periphery thereof to surround the expansion portion therewith.