Pipe Joint Inner Ring Tapering to Prevent Flow Passage Protrusion
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Solution Overview
Problem
Conventional pipe joints with inner rings experience reduced fluid replacement characteristics due to axial end portion deformation, causing protrusion into fluid flow passages, which is exacerbated by inadequate or excessive tapered surface lengths.
Innovation Solution
The inner ring design features tapered surfaces at axial ends with strategically located diameter increase starting points to prevent deformation into fluid passages, ensuring a sufficient deformation margin and maintaining thickness, thereby inhibiting protrusion into fluid flow passages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If tapered surfaces are formed at axial end portions of the inner ring, then protrusion into fluid flow passage is inhibited, but deformation margin becomes insufficient when tapered surface length is short
Solution Approach 1:
The invention optimizes the length parameter of the tapered surface to achieve the minimum required length that provides sufficient deformation margin while preventing protrusion. By carefully controlling this dimensional parameter, the design balances the prevention of harmful protrusion with maintaining adequate structural deformation capacity.
2Object-affected harmful factors
If tapered surface length is increased to provide deformation margin, then protrusion is inhibited, but thickness in radial direction becomes excessively small
Solution Approach 1:
The invention determines the optimal tapered surface length that simultaneously satisfies two constraints: providing sufficient deformation margin to prevent protrusion and maintaining adequate radial thickness for structural integrity. This involves finding the precise parameter value where both requirements are met.
Solution Approach 2:
The tapered surface is applied locally at specific axial end portions of the inner ring where deformation occurs during press-fitting. This localized application provides the necessary deformation margin exactly where needed while preserving adequate thickness in other critical areas of the inner ring structure.
3Strength
If both end portions are pressed toward radially inner side during press-fitting, then connection is secured, but inner circumferential surface end portions deform and protrude into fluid flow passage
Solution Approach 1:
The tapered surfaces are pre-formed on the inner ring before press-fitting occurs. These pre-formed tapered surfaces create deformation margins that anticipate and prevent protrusion during the subsequent press-fitting process. The preliminary structural preparation ensures that when radial compression occurs, the deformation is contained within the tapered zone and does not protrude into the fluid passage.
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
Effectively prevents the inner circumferential surface end portions from protruding into fluid flow passages, enhancing fluid replacement characteristics and reducing deformation-related issues.
Implementation Method 1
both end portions in the axial direction of the inner circumferential surface of the inner ring 110 are deformed so as to fall down toward the radially inner side
Data Source
AI summary
An inner ring of a pipe joint includes a first tapered surface formed at one axial end portion of an inner circumferential surface such that a diameter thereof gradually increases from another axial side toward one axial end thereof in a state before a bulge portion is press-fitted into an end portion of a tube. A diameter increase starting point of the first tapered surface is located in a range from a deformation starting point, which serves as a starting point from which an inner circumferential surface is deformed due to the bulge portion 5 receiving external force from the tube 8 when the bulge portion is press-fitted into the end portion of the tube, to a position, on the inner circumferential surface, corresponding to one axial end of an outer circumferential surface of a body portion.