Cam-Driven PEX Expansion Head for Precise Single-Cycle Sealing
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Solution Overview
Problem
Existing PEX tubing expansion tools lack efficiency and precision in expanding PEX tubing to accommodate fittings, often requiring multiple cycles and varying ambient temperatures, which affects the sealing time and consistency.
Innovation Solution
A PEX expansion tool with a motor-driven mechanism that includes a cam and drive shaft, converting rotational input into translational movement of a mandrel to expand the tubing, featuring interchangeable heads for different diameters and temperature compensation, ensuring consistent expansion and sealing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If existing PEX expansion tools are used, then the tubing can be expanded, but the expansion lacks precision and requires multiple cycles
Solution Approach 1:
The patent replaces traditional manual or simple mechanical expansion mechanisms with a motor-driven cam mechanism. The motor provides controlled rotational motion that is converted by the cam into precise translational movement of the mandrel, enabling accurate and consistent expansion diameters in a single cycle, thereby reducing sealing time while improving precision.
Solution Approach 2:
The patent employs interchangeable heads with different cam profiles to change the expansion parameters. Each head is designed with specific cam geometry that determines the mandrel's translational movement pattern, allowing precise control over the expansion diameter and profile for different tubing sizes and requirements, achieving accurate expansion in one cycle.
2Reliability
If ambient temperature varies, then the expansion process is affected, but consistency of sealing performance deteriorates
Solution Approach 1:
The patent incorporates temperature compensation features that pre-adjust the expansion parameters based on anticipated temperature conditions. The system includes temperature sensing and control mechanisms that modify the cam profile selection or motor operation parameters in advance, compensating for temperature effects before the expansion occurs, thereby maintaining consistent sealing performance across varying ambient temperatures.
3Adaptability or versatility
If a single expansion tool design is used, then device complexity is low, but adaptability to different tubing diameters is limited
Solution Approach 1:
The patent creates a universal expansion tool platform with interchangeable heads that can accommodate different tubing diameters. The main body housing and motor mechanism remain the same, while different cam-driven heads are attached as needed. This modular approach provides multi-functionality and adaptability across various tubing sizes without significantly increasing the complexity of the core tool design.
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 tool efficiently expands PEX tubing to precise diameters, reduces sealing time, and adapts to temperature variations, providing consistent performance across different conditions.
Implementation Method 1
The drive mechanism includes a cam and a drive shaft coupled to the cam
Implementation Method 2
The PEX tube elastically recovers around the fitting to form a tight connection
Data Source
AI summary
An expansion tool includes a housing, a motor supported within the housing, a mandrel, and a drive mechanism configured to convert a rotational input from the motor into translational movement of the mandrel. The drive mechanism includes a cam and a drive shaft coupled to the cam. The expansion tool further includes a frame including a hub and a neck extending from the hub and having an opening. A working element is coupled to the neck and has a plurality of jaws movable from a closed position toward an expanded position in response to movement of the mandrel from a retracted position toward an extended position. The mandrel extends through the opening to engage the jaws, and the drive shaft is rotatably supported by the hub.