Refrigeration device for a shipping container, and shipping container
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Solution Overview
Problem
Existing refrigeration apparatuses for shipping containers cannot accurately detect temperatures at specific locations within the internal space due to the temperature sensor's inability to be positioned away from the internal wall or oriented in a desired direction, leading to inefficient heat conduction and potential damage from vibrations during transportation.
Innovation Solution
A refrigeration apparatus with a guide member that extends from the casing into the internal space, holding the temperature sensor and lead wire to allow precise temperature detection while reducing heat conduction from the outside and protecting the sensor from vibrations, featuring a curved portion, inclined surfaces, and separate passage members to improve ventilation and assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the temperature sensor is positioned by contacting a stepped portion at the tip end of the cylinder, then the temperature sensor can be positioned, but the tip end of the temperature sensor cannot be located away from the internal wall or oriented to a desired direction in the internal space
Solution Approach 1:
The guide member is divided into a cylindrical portion and a distal end portion with different functions. The cylindrical portion provides positioning through the stepped portion, while the distal end portion extends into the internal space to enable flexible sensor orientation and location away from the wall, thus resolving the contradiction between positioning accuracy and positioning flexibility.
Solution Approach 2:
The guide member extends from the wall into the internal space, adding a spatial dimension to the sensor positioning. This allows the temperature sensor to be oriented in desired directions and located at specific positions within the internal space, not just at the wall surface, thereby improving adaptability while maintaining positioning precision.
2Ease of manufacture
If the temperature sensor is positioned close to the internal wall for mounting convenience, then assembly is easy, but heat conduction from the outside affects temperature measurement accuracy
Solution Approach 1:
The guide member acts as an intermediary structure that connects the mounting location at the internal wall to the desired measurement location in the internal space. It transmits the mechanical support from the wall while positioning the sensor at a distance that reduces heat conduction interference, thus maintaining assembly convenience while improving measurement accuracy.
3Device complexity
If the temperature sensor is exposed without protection, then the structure is simple, but the sensor is vulnerable to damage from vibrations during transportation
Solution Approach 1:
The temperature sensor is nested within the guide member structure. The guide member encompasses the sensor, providing protection against vibrations and mechanical damage during transportation, while maintaining a relatively simple overall structure that does not significantly increase device complexity.
4Device complexity
If a straight guide member is used, then the structure is simple, but the temperature sensor cannot be arranged at a specific location while maintaining distance to reduce heat conduction
Solution Approach 1:
The guide member incorporates a curved distal end portion that extends into the internal space. This curvature allows the temperature sensor to be positioned at a specific location away from the wall while maintaining a compact structure, thus improving measurement accuracy without excessive structural complexity.
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
Enables accurate temperature detection at specific locations within the shipping container while minimizing heat conduction from the outside and protecting the temperature sensor from vibrations, ensuring reliable temperature monitoring and reduced operational costs.
Implementation Method 1
The guide member (60) holds the detector (51) and the lead wire (52). The detector (51) and the lead wire (52) of the temperature sensor (50) being held by the guide member (60) make it possible to detect the temperature at a specific location in the internal space (20). This configuration allows the temperature sensor (50) to be arranged at a specific location in the internal space (20) while keeping a distance that can reduce conduction of heat from the outside.
Implementation Method 2
The air flows around the guide member (60) in a predetermined flow direction. The guide member (60) has a curved portion (72) that is arranged in the internal space (20) and is curved when viewed in the flow direction of the air.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A guide member (60) extends from an opening of a casing (11) toward an internal space (20). The guide member (60) guides the temperature sensor (50) to the internal space (20). The detector (51) and the lead wire (52) of the temperature sensor (50) are held by the guide member (60).