Spiral Heating Wire with Variable Turn Density for Uniform Temperature Control
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Solution Overview
Problem
Conventional measuring apparatuses for PVT properties of plastics face errors due to non-uniform temperature distribution, leading to density inconsistencies, material leakage, and mechanical issues during injection molding, as they typically operate under isobaric or isothermal conditions without effectively managing temperature variations and pressures.
Innovation Solution
A measuring apparatus with a temperature-controlling cylinder and pistons that form a testing chamber, featuring a spiral wire and pipe structure with varying density, isolated from the liquid flow, and equipped with temperature transducers to ensure uniform temperature distribution and pressure control, allowing for precise volumetric measurements under different temperatures and pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional isobaric or isothermal measuring conditions are used, then the measuring apparatus structure is simple, but non-uniform temperature distribution causes density inconsistency and volumetric measurement errors
Solution Approach 1:
The patent applies local quality by implementing a spiral heating wire with non-uniform turn density around the testing chamber. The heating wire has higher turn density at the ends of the chamber and lower density in the middle section, creating localized heating zones that compensate for heat loss at the ends. This non-uniform distribution pattern ensures uniform temperature throughout the chamber while avoiding the need for complex active control systems.
Solution Approach 2:
The patent changes the geometric parameter of the heating wire (turn density) to achieve uniform temperature distribution. By varying the spacing between spiral turns along the length of the chamber, the heating efficiency is modulated spatially. This parameter change approach transforms a potentially complex control problem into a simple geometric design solution.
2Reliability
If non-uniform temperature distribution occurs, then the measuring apparatus structure is simple, but material leakage and mechanical sticking/rubbing issues arise
Solution Approach 1:
The spiral heating wire design with variable turn density applies local quality by concentrating heating zones at the chamber ends where temperature gradients typically cause sealing problems. This localized heating approach prevents material leakage and mechanical sticking by maintaining uniform temperature at critical sealing locations without requiring complex active temperature control.
3Temperature
If uniform temperature distribution is achieved through complex control systems, then temperature uniformity is improved, but device complexity and cost increase
Solution Approach 1:
The patent achieves uniform temperature distribution by changing the geometric parameter of the heating element itself - the spiral wire turn density - rather than using complex control systems. This passive design approach varies the heating parameter spatially to compensate for heat loss patterns, eliminating the need for sensors, controllers, and active regulation mechanisms.
Solution Approach 2:
The heating system is designed to be self-regulating through its geometric configuration. The non-uniform spiral pattern inherently provides the necessary temperature distribution without external control, allowing the system to maintain uniform temperature automatically based on its own structural properties rather than requiring external monitoring and adjustment.
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 apparatus provides accurate and reliable measurements of volumetric variations by maintaining uniform temperature and pressure conditions, reducing errors and mechanical issues, and enabling precise control over the testing environment.
Implementation Method 1
a heating wire and an insulation layer surrounding the heating wire
Implementation Method 2
a heating wire and an insulation layer surrounding the heating wire, wherein the insulation layer is in contact with the testing chamber
Implementation Method 3
a pipe surrounding the testing chamber along the longitudinal length
Implementation Method 4
an upper piston and a lower piston respectively sealing the top opening and the bottom opening of the temperature-controlling cylinder
Data Source
AI summary
The present disclosure provides a measuring apparatus including a testing module. The testing module includes: a temperature-controlling cylinder having a top opening and a bottom opening; an upper piston and a lower piston respectively seal the top opening and the bottom opening of the temperature-controlling cylinder so that a testing chamber is formed inside the temperature-controlling cylinder, wherein the testing chamber has a longitudinal length; and a pipe surrounding the testing chamber along the longitudinal length in such a way that when a wire is provided along and in the pipe with a number of turns, a density of the turns has at least two different values over the longitudinal length.