Sampling Tube Bundle Temperature Control and Signal Integration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing sampling tube bundles for MCC-IMS instruments in customs inspection lack precise temperature control, leading to inefficiencies and uneven heating, and they do not integrate signal transmission effectively, making them unsuitable for long-term use in personnel and cargo inspections.
Innovation Solution
A sampling tube bundle with a self-controlling temperature heat tracing cable, a PID-controlled heating pad, and integrated signal transmission lines, wrapped in a metal woven layer and insulation materials, along with a quick-connect joint assembly for efficient temperature regulation and signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a self-limiting temperature heat tracing band is used for heating, then the tube bundle can prevent gas condensation and maintain temperature above dew point, but the temperature control error becomes larger (>±°C.) and cannot adjust temperature in time
Solution Approach 1:
The patent applies feedback control by using a temperature sensor to detect the actual temperature of the sampling tube and feed this information back to a control device. The control device then adjusts the power supply to the heating wire based on the temperature difference between the set value and actual value, achieving precise and responsive temperature control. This resolves the contradiction by creating a closed-loop system that continuously monitors and adjusts temperature, eliminating the lag and imprecision of self-limiting heat tracing bands.
Solution Approach 2:
The patent replaces the mechanical/self-limiting heat tracing band with an electric heating wire system controlled by electronic components (temperature sensor, control device, power supply). This substitution allows for precise electronic control of heating parameters, enabling rapid temperature adjustment and accurate maintenance of set temperature points, thereby resolving the responsiveness and precision issues of the mechanical heat tracing system.
2Device complexity
If the heating element uses a self-limiting temperature heat tracing band, then the structure is simple, but the temperature control error is larger and high-boiling substances are easily remained in uneven places
Solution Approach 1:
The feedback control system continuously monitors temperature distribution and adjusts heating power to maintain uniform temperature across the sampling tube. The temperature sensor detects temperature variations and the control device modulates the heating wire power accordingly, preventing hot and cold spots that would cause uneven heating and retention of high-boiling substances.
Solution Approach 2:
The patent transitions from a static, fixed heating system to a dynamic, adjustable heating system. The heating wire's power consumption can be dynamically adjusted based on real-time temperature feedback, allowing the system to adapt to changing conditions and maintain optimal temperature distribution, thereby achieving uniform heating without the complexity limitations of static heat tracing bands.
3Strength
If the heat insulation material and sheath material have higher hardness, then they can adapt to greater deformation, but it is not beneficial for flexible sampling
Solution Approach 1:
The patent applies different material properties to different parts of the tube bundle structure. The inner sampling tube and heating elements use flexible materials to maintain bending capability, while the outer sheath and support structures use harder materials for protection and structural integrity. This local differentiation allows the tube bundle to withstand deformation forces while maintaining flexibility for sampling operations.
Solution Approach 2:
The patent uses a composite structure combining multiple materials with different properties. The tube bundle includes flexible inner components for sampling, intermediate layers for insulation and support, and outer protective sheaths. This composite construction integrates the flexibility needed for sampling with the strength required to resist deformation, resolving the contradiction between operational flexibility and structural strength.
4Device complexity
If the tube bundle has no interface design, then the structure is compact, but it cannot be connected or replaced quickly and conveniently
Solution Approach 1:
The patent divides the tube bundle into modular segments with standardized interfaces. The quick-connect joint assembly allows the tube bundle to be segmented into replaceable sections, enabling rapid connection and disconnection without complex assembly procedures. This segmentation maintains overall structural compactness while providing efficient connection capabilities through standardized, pre-designed interface components.
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 provides real-time temperature control with reduced errors, ensures uniform heating, and integrates signal transmission, enhancing the efficiency and reliability of gas sampling in MCC-IMS systems for extended periods.
Implementation Method 1
a heating pad comprising a heat tracing cable wrapping an outer circumference of the metal woven layer, for heating the sampling gas in the gas sampling tube
Implementation Method 2
coating a heat insulation layer around the outer circumference of the fireproof layer
Data Source
AI summary
A sampling tube bundle includes a tube bundle body and a joint assembly. The tube bundle body includes a gas sampling tube for transmitting sampling gas; a metal woven layer wrapping an outer circumference of the gas sampling tube; a heating pad comprising a heat tracing cable wrapping an outer circumference of the metal woven layer, for heating the sampling gas in the gas sampling tube; a flame resistant tape wound around an outer circumference of the of the heating pad; a plurality of signal transmission lines circumferentially spaced apart from one another are arranged outside the flame resistant tape; and a sheath located outside the signal transmission line. The joint assembly is arranged on an end of the tube bundle body, for connecting to an analysis device or a sampling device.