Container Fumigation Door for Leak-Safe Cold-Chain Aeration
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Solution Overview
Problem
Conventional tarpaulin-based fumigation methods for containerized cargo are time-consuming, prone to leaks, require excessive fumigant use, and disrupt the cold chain by exposing perishable goods to elevated temperatures during aeration, posing environmental and economic challenges.
Innovation Solution
A portable containment door with integral fumigant diffuser and connection ports is used to inject and disperse fumigant, combined with the existing refrigeration unit fan for circulation, and a suction pump for aeration, maintaining the cold chain and minimizing fumigant use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tarpaulin is used to enclose the container for fumigation, then the container can be sealed for fumigant containment, but the method becomes time-consuming and prone to leaks
Solution Approach 1:
The invention removes the tarpaulin from the fumigation system and replaces it with the container's existing structural components (doors, seals, and ventilation systems). This extraction eliminates the time-consuming tarpaulin installation and removal process while maintaining effective fumigant containment through the container's built-in sealing mechanisms.
Solution Approach 2:
The container's existing doors, seals, and ventilation systems are utilized to perform the fumigation containment function. The container essentially serves itself by using its own structural features rather than requiring external tarpaulins and manual sealing processes, thereby reducing time and improving reliability.
2Reliability
If tarpaulin is used to enclose the container, then fumigant can be contained, but excessive fumigant is required and leakage occurs
Solution Approach 1:
By removing the tarpaulin and using the container's existing sealed structure, the system eliminates the leakage problems associated with tarpaulin edges and sealing issues. The container's built-in seals provide more reliable containment, reducing fumigant loss through leakage.
Solution Approach 2:
The invention focuses fumigant application locally through targeted injection points and utilizes the container's existing ventilation system for precise air exchange control. This localized approach ensures efficient fumigant distribution and containment without the excessive quantities required by tarpaulin methods.
3Productivity
If conventional aeration method is used with fans and exhaust ducts under tarpaulin, then fumigant can be evacuated, but the cold chain is disrupted and temperatures rise
Solution Approach 1:
The container's refrigeration unit fan serves dual purposes: it circulates air during normal refrigeration and facilitates aeration after fumigation. This multi-functionality enables efficient fumigant evacuation while the refrigeration system maintains the cold chain, preventing temperature rise that would occur with external fan systems.
Solution Approach 2:
The refrigeration system performs the aeration function using its own existing fan and air circulation infrastructure. This self-service approach eliminates the need for separate aeration equipment and ensures that the cold chain is maintained throughout the aeration process, as the refrigeration system is already designed to control temperature.
4Volume of moving object
If refrigeration unit fan is used for fumigant circulation, then space is saved and cargo capacity increases, but the system must handle dual functions
Solution Approach 1:
The refrigeration unit fan is designed to perform multiple functions: normal air circulation during refrigeration and fumigant circulation during fumigation. This multi-functionality maximizes cargo capacity by eliminating the need for separate circulation fans while the system adapts to different operational modes through control system management.
Solution Approach 2:
The system changes operational parameters (fan speed, air flow rate, circulation pattern) to accommodate different functions. During fumigation, the fan operates at higher speeds with modified air flow patterns to effectively circulate fumigant, while during normal refrigeration, it operates at lower speeds for gentle air circulation, thereby adapting to different functional requirements.
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 system minimizes fumigant leakage, reduces fumigant requirements, and maintains cold chain integrity during fumigation and aeration, enhancing efficiency and environmental safety.
Implementation Method 1
a suction pump for aeration
Implementation Method 2
combined with the existing refrigeration unit fan for circulation
Implementation Method 3
integral fumigant diffuser and connection ports is used to inject and disperse fumigant
Data Source
AI summary
Tarpless fumigation and powered aeration of containerized cargo within a shipping container are disclosed. A portable fumigation containment door is installed in covering relation with main rear opening of a standard cargo container. The door is adapted with a fumigant diffuser for dispersing fumigant within the container. A recirculating fan disperses and circulates fumigant within the shipping container. Powered aeration is used to aerate the container through ports in the containment door by drawing fumigant laden air from the container while drawing in ambient air, while the container refrigeration unit is used to maintain a desired temperature.