Press Fitting Stop Ring Geometry for Secure Low-Force Assembly
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Solution Overview
Problem
Existing press fittings for pipe connections are prone to damage during production and assembly, especially from lateral impacts, and may not securely hold the stop ring before the pressing sleeve is mounted on the fitting body, leading to potential detachment issues.
Innovation Solution
A press fitting design featuring a stop ring with a cylindrical inner contour having protruding and recessed areas that securely clamps onto the pressing sleeve, along with a circumferential groove and radially inward projections for direct fixation to the fitting body, ensuring stability and preventing accidental detachment, and an assembly method that tilts the pressing sleeve for reduced assembly forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pressing sleeve design is used without a clamping mechanism, then the device complexity is reduced, but the stop ring cannot be securely held before pressing, leading to potential detachment
Solution Approach 1:
The stop ring features localized protruding areas with clamping surfaces that engage specific regions of the pressing sleeve, rather than requiring a complete circumferential clamping mechanism. This localized approach provides secure holding at critical points while maintaining overall structural simplicity
Solution Approach 2:
The stop ring design incorporates asymmetric protruding and receding areas that create a non-uniform clamping profile. The protruding areas with clamping surfaces provide localized engagement points on the pressing sleeve, achieving secure positioning without symmetric complexity
2Ease of manufacture
If the pressing sleeve is assembled directly without tilting, then the assembly process is simpler, but high assembly forces are required causing damage to parts
Solution Approach 1:
The pressing sleeve is pre-formed with an inclined inner surface before assembly. This preliminary geometric configuration guides the stopping element into proper alignment during insertion, distributing assembly forces evenly and preventing impact damage without requiring complex assembly tools or procedures
3Reliability
If the stop ring has a uniform inner contour, then the manufacturing precision is easier to maintain, but the clamping connection is insufficient due to tolerances
Solution Approach 1:
Rather than requiring uniform high-precision machining around the entire stop ring inner contour, the design provides localized protruding areas with precisely formed clamping surfaces. These localized features engage specific regions of the pressing sleeve, achieving secure clamping while allowing greater tolerance in non-critical areas
Solution Approach 2:
The pressing sleeve is pre-formed with an inclined inner surface before assembly. This preliminary geometric configuration guides the stopping element into proper alignment during insertion, distributing assembly forces evenly and preventing impact damage without requiring complex assembly tools or procedures
Data Source
AI summary
A press fitting for a pipe connection is provided. The press fitting comprises a fitting body for connecting the press fitting to a pipe, a substantially cylindrical pressing sleeve fixed to the fitting body and having a pressing area, and a stop ring fixed to the pressing sleeve and limiting the pressing area in an axial direction of the press sleeve. The stop ring has a substantially cylindrical inner contour with protruding first regions and second regions receding from the first regions. The first areas of the first stop ring encompass an outer contour of the pressing sleeve in a clamping manner. The second areas of the stop ring are spaced from the outer contour of the pressing sleeve.