Refrigeration system
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Solution Overview
Problem
Conventional refrigeration apparatuses with cascade heat exchangers face challenges in carrying and installation due to protruding insulating structures, which increase the depth dimension and reduce storage volume, making them difficult to carry through standard entrances and requiring laborious installation processes.
Innovation Solution
The refrigeration apparatus features a side wall opening for the mechanical chamber, allowing the insulating structure with the cascade heat exchanger to be inserted from the rear, with pipes extending from the opposite end, and uses vacuum insulating panels and foam insulation to reduce the thickness of the insulating material while maintaining effective insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the insulating structure is provided externally to cover the cascade heat exchanger, then the insulation performance is improved, but the depth dimension of the apparatus increases and storage volume decreases
Solution Approach 1:
The cascade heat exchanger is nested within the insulating structure, with the insulating material positioned between the heat exchanger and the external environment. This integration allows the insulation function to be achieved without adding external protrusions, thereby maintaining storage volume while ensuring thermal insulation performance.
Solution Approach 2:
The insulating structure is repositioned from an external attachment to an internal integration within the apparatus depth dimension. By incorporating the insulation layer within the existing structural depth rather than adding it externally, the storage volume is preserved while insulation effectiveness is maintained.
2Reliability
If the insulating material thickness is increased to prevent dew attachment, then the insulation performance is improved, but the apparatus becomes difficult to carry through standard entrances
Solution Approach 1:
The insulating material is strategically positioned only at critical locations where dew condensation is most likely to occur, such as around the cascade heat exchanger and other cold surfaces. This localized insulation approach provides sufficient protection against dew attachment without requiring uniform thick insulation throughout the entire apparatus, thereby maintaining a compact depth dimension suitable for carrying through standard entrances.
3Volume of moving object
If the insulating structure is integrated into the main body, then the storage volume is improved, but the installation process becomes more complex
Solution Approach 1:
The insulating structure is designed as a separate, modular component that can be independently manufactured and then installed as a unit. This segmentation allows for simplified manufacturing and installation processes, as the insulating structure can be pre-assembled and then integrated into the main body without requiring complex in-situ construction, thereby balancing storage volume optimization with ease of installation.
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
This design enables easy carrying and installation by reducing the depth dimension of the apparatus, avoiding protrusions that could get stuck in entrances and minimizing the required installation area, while maintaining efficient insulation and storage volume.
Implementation Method 1
an insulating structure having first and second opposite ends and in which the periphery of the cascade heat exchanger is surrounded with insulating material
Implementation Method 2
an evaporator of the low-temperature-side refrigerant circuit being configured to cool a storage chamber constituted in an insulating box body to an extremely low temperature
Implementation Method 3
a refrigerant discharged from a compressor is condensed and then evaporated to exert a cooling function
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
There is disclosed a refrigeration apparatus including a cascade heat exchanger and capable of reducing the depth dimension of the apparatus itself without being influenced by the thickness dimension of an insulating material for covering the cascade heat exchanger, so that the apparatus can easily be carried indoors through a usual carrying entrance. In a refrigeration apparatus 1 including a high-temperature-side refrigerant circuit 25 and a low-temperature-side refrigerant circuit 38, an evaporator 34 of the high-temperature-side refrigerant circuit 25 and a condensing pipe 42 of the low-temperature-side refrigerant circuit 25 constitute a cascade heat exchanger 43, and an evaporation pipe 62 of the low-temperature-side refrigerant circuit 38 is configured to cool a storage chamber 4 constituted in an insulating box body 2 to an extremely low temperature. The apparatus includes a mechanical chamber 3 which is constituted by the side of an insulating box body 2 and in which a compressor 10 and the like are installed, and an insulating structure 70 in which the periphery of the cascade heat exchanger 34 is surrounded with an insulating material is arranged in a side wall of the insulating box body 2 on the side of the mechanical chamber 3.