Press Fitting Assembly With Grip Ring and Separator for Leak-Proof Joints
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Solution Overview
Problem
Press fitting assemblies in the plumbing industry face issues with uneven stress and hoop stress, leading to potential failure when using conventional sleeves for tubular connections, as they lack sufficient gripping and sealing mechanisms.
Innovation Solution
A press fitting assembly that includes a receiving device with a grip ring having opposing teeth, a sealing element with lobes, and a separator ring with an angled portion, which together provide enhanced gripping and sealing capabilities while preventing damage to the sealing element during assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional sleeve is used for mechanical grip, then the structure is simple, but the joint fails under uneven stress and hoop stress
Solution Approach 1:
The grip ring is segmented into multiple teeth that can independently engage with the pipe surface, distributing stress across multiple contact points rather than a single continuous surface. This segmentation allows the structure to maintain simplicity while significantly improving reliability under stress conditions.
Solution Approach 2:
The press fitting assembly combines multiple materials with different properties: the grip ring uses a hard material for gripping, the sealing element uses a soft compliant material for sealing, and the separator ring uses a protective material. This composite approach resolves the contradiction by integrating functional complexity into a unified assembly that maintains overall structural simplicity.
2Strength
If a grip ring with teeth is added to enhance gripping, then the gripping performance improves, but the risk of damaging the sealing element increases
Solution Approach 1:
The separator ring acts as an intermediary element positioned between the grip ring teeth and the sealing element. It provides mechanical protection to the sealing element from the teeth while allowing the grip ring to maintain its gripping function. This mediator resolves the contradiction by enabling strong gripping without transmitting harmful forces to the sealing element.
Solution Approach 2:
The separator ring is designed with segmented or flexible features that allow it to deform and absorb the concentrated forces from the grip ring teeth, preventing these forces from being transmitted to the sealing element. This segmentation approach protects the sealing element while maintaining grip strength.
3Strength
If pressure is concentrated at the grip ring to enhance gripping, then the grip strength increases, but uneven stress distribution causes joint failure
Solution Approach 1:
The grip ring is divided into multiple teeth that contact the pipe at different locations, distributing the gripping pressure across multiple discrete points. This segmentation transforms concentrated stress into distributed stress, maintaining grip strength while preventing joint failure from uneven stress distribution.
Solution Approach 2:
Each tooth of the grip ring is designed with specific local geometry and material properties optimized for gripping, while the overall assembly maintains balanced stress distribution. The local quality of each tooth provides high grip strength, while the global arrangement ensures even stress distribution across the joint.
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 enhances the gripping and sealing performance of press fitting assemblies, reducing the risk of failure due to stress and ensuring a secure, leak-proof connection by distributing pressure evenly and shielding the sealing element from the grip ring's teeth.
Implementation Method 1
The purpose of these interlocking devices is to mechanically grip the inserted tube, increasing joint slip resistance
Implementation Method 2
a sealing element positioned within the receiving device and abutting the shoulder, wherein the sealing element comprises at least one lobe
Data Source
AI summary
A press fitting assembly is provided that includes: a piping component including a receiving device which includes an open end and a shoulder, the open end comprising a continuous stop; a grip ring positioned within the receiving device abutting the continuous stop and comprising a plurality of opposing teeth; a sealing element positioned within the receiving device and abutting the shoulder, wherein the sealing element comprises at least one lobe; and a separator ring positioned within the receiving device between the sealing element and the grip ring, the ring comprises a base portion and an angled portion. Further, the angled portion is angled toward the sealing element and the shoulder.