Pipe Connection Cone Angle Optimization
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Solution Overview
Problem
Existing pipe connections for thin-walled pipelines face internal incursions during the forming process, compromising the sealing function due to insufficient cone angles, which also lead to inadequate axial tension force transmission and potential deformation.
Innovation Solution
Increasing the cone angle of the connector bore and connection portion to 38° to 50°, along with a sufficient shoulder height, ensures proper sealing and axial tension force transmission without deformation, and using larger cone angles for the locating face to prevent conjoint rotation and minimize tightening torques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a small cone angle (up to 24°) is used in the connector bore and connection portion, then the sealing face length can be longer, but internal incursions occur during the forming process of thin-walled pipelines, compromising the sealing function
Solution Approach 1:
The patent applies parameter changes by increasing the cone angle from the conventional 24° to a range of 38° to 50°. This parameter modification prevents internal incursions during the forming process of thin-walled pipelines while maintaining adequate sealing face length, thereby resolving the contradiction between manufacturing precision and sealing reliability
Solution Approach 2:
The patent uses excessive action by selecting a cone angle (38°-50°) that exceeds the conventional minimum requirement. This larger angle provides a safety margin that ensures internal incursions are completely avoided during forming, while the sealing face remains sufficiently long to maintain the sealing function
2Force
If a small cone angle is used, then the axial tension force transmission is insufficient, but increasing the cone angle may cause plastic deformation of the connection portion
Solution Approach 1:
The patent modifies the cone angle parameter to an optimal range (38°-50°) that provides sufficient axial tension force transmission capability while avoiding excessive stress concentration that would cause plastic deformation. This parameter optimization resolves the contradiction between force transmission and structural integrity
Solution Approach 2:
The patent applies excessive action by using a larger cone angle than the minimum required for force transmission. This ensures adequate axial tension force transmission while the angle remains within the safe range that prevents plastic deformation, providing a margin of safety
3Manufacturing precision
If a steep cone angle (38° to 50°) is used, then the sealing face length decreases, but the shoulder height can be maintained, preventing internal incursions
Solution Approach 1:
The patent changes the cone angle parameter to a steeper range (38°-50°), which shortens the sealing face length but prevents internal incursions during forming. The shoulder height is maintained to compensate for the shorter sealing face, resolving the contradiction between manufacturing precision and sealing face length
Solution Approach 2:
The patent compensates for the reduced sealing face length in one dimension (axial length) by maintaining adequate shoulder height in another dimension (radial height). This dimensional compensation resolves the contradiction by distributing the sealing function across different geometric parameters
Data Source
AI summary
A pipe connection for connecting metal thin-walled pipeline. The pipeline has a shaped connecting segment that increases from the end of the connecting segment in the form of a frustum forming a circumferential sealing surface and a shoulder defining a stop surface adjacent to the sealing surface. The pipe connection also includes a connection stub having a connection thread and a connection bore, which decreases in size and defines a circumferential connection surface for contacting the sealing surface. A union threaded part includes a clamping thread and a passage opening, which has, on the inner circumference, a circumferential clamping surface for contacting the stop surface. The cone angle of the connecting segment in the region of the sealing surface and the cone angle of the connection bore in the region of the connection surface are in the range of about 38° to 50°.