Metal Corrugated Pipe Joint With Heat-Resistant Compression Sealing
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Solution Overview
Problem
Existing connection methods for metal corrugated pipes, such as the flare joint method, fail to completely prevent gas leakage due to the degradation of rubber packing at high temperatures and lack of precision in processing at the piping site, leading to compromised airtightness over time.
Innovation Solution
A connection structure featuring a first connection member with an external thread and an inclined surface, a second connection member with an internal thread, and a heat-resistant packing that compresses and adheres to the inclined surface, ensuring airtight sealing without additional machining, using a tubular ring-shaped metal packing and an anti-separation ring for enhanced sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a rubber packing is used for connection, then the connection structure is simple, but the airtightness deteriorates at high temperatures due to melting
Solution Approach 1:
The packing material is changed from rubber to heat-resistant material (such as PTFE or metal), fundamentally changing the thermal resistance parameter to withstand high temperatures without melting, thereby maintaining airtightness in high-temperature environments
Solution Approach 2:
The connection structure uses a composite design combining heat-resistant packing material with metal connection members, creating a system that leverages the thermal stability of the packing and the mechanical strength of the metal components to achieve both simplicity and reliability
2Device complexity
If the flare joint method is used, then additional packing members are eliminated, but gas leakage occurs at connection portions
Solution Approach 1:
The connection structure applies different functional qualities to different regions: the inclined surface provides mechanical compression, while the heat-resistant packing material provides the sealing function, and the corrugated pipe end provides structural support, creating a specialized zone for airtight sealing
Solution Approach 2:
The heat-resistant packing material acts as an intermediary sealing element between the corrugated pipe and connection member, providing a reliable airtight barrier while allowing for practical installation without requiring precise machining at the work site
3Reliability
If precise trumpet shape processing is performed, then airtightness is improved, but the processing complexity and equipment requirements increase
Solution Approach 1:
Instead of creating a precise trumpet shape at the pipe end and fitting it into a matching connector, the design inverts the approach by using a standard corrugated pipe end that is inserted into a connector with an inclined compression surface, reversing who does the precise shaping - the connector rather than the pipe
Solution Approach 2:
The connection structure enables field installation without requiring specialized machining equipment or precise trumpet shaping, allowing workers to make simple insertion and tightening operations that automatically create the seal through the compression mechanism
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 maintains complete airtightness between metal corrugated pipes and boiler combustors, preventing gas leakage and allowing for precise connections without requiring additional machining at the piping site, ensuring long-term sealing performance.
Implementation Method 1
ends of a metal packing and the metal corrugated pipe are compressed by the force of mutual engagement of screw type connection members
Implementation Method 2
the end of the metal packing strongly adheres to an inner surface of the connection member and an outer surface of the metal corrugated pipe
Data Source
AI summary
The present invention relates to a connection structure of a metal corrugated pipe, which is used to connect metal corrugated pipes with each other or to connect a metal corrugated pipe to a boiler combustor. The connection structure includes a first connection member having one side, in which an external thread is formed on an outer surface of the one side and an inner surface of the one side has a diameter gradually reduced to form an inclined surface; a second connection member formed on an inner surface thereof with an internal thread screw-coupled with the external thread; and a heat-resistant packing fitted on the outer surface of the metal corrugated pipe, in which a front end of the heat-resistant packing is compressed by the inclined surface as the first connection member is screw-coupled with the second connection member.