Stacked-Plate Refrigerant Flow Path Unit for Compact Component Layout
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Solution Overview
Problem
Existing refrigeration apparatuses with stacked substrate refrigerant flow path units are limited by the need for a large surface area to accommodate components, leading to increased size and inefficiencies in component connection and maintenance.
Innovation Solution
A refrigeration apparatus with a refrigerant flow path unit comprising stacked plates, where one surface connects functional components like flow path switching valves and expansion valves, and the other surface connects containers like the compressor and accumulator, allowing for a reduced footprint and improved vibration control through strategic component placement and brazing of refrigerant pipes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a stacked substrate refrigerant flow path unit is used to reduce size, then the refrigerant circuit size is reduced, but the surface area required to accommodate components increases
Solution Approach 1:
The patent transitions from a planar substrate configuration to a three-dimensional stacked plate structure. Multiple refrigerant flow path units are stacked in the vertical dimension, allowing components to be distributed across different heights rather than competing for surface area. This dimensional change enables compact arrangement while maintaining adequate space for component connection and maintenance access.
Solution Approach 2:
The stacked plate structure creates nested layers where refrigerant flow path units are positioned between upper and lower plates. Components are strategically positioned at different levels - some connected to upper plates, others to lower plates - creating a nested arrangement that maximizes space utilization. This nesting allows the system to fit more components into a smaller overall footprint by utilizing vertical space efficiently.
2Device complexity
If components are connected to a single surface of the substrate, then the structure is simplified, but maintenance accessibility deteriorates
Solution Approach 1:
The refrigerant flow path system is segmented into multiple independent plate units stacked together. Each plate can be individually accessed from different sides, allowing maintenance personnel to reach components connected to different plates from different directions. This segmentation breaks the monolithic substrate structure into manageable sections, improving accessibility without significantly increasing connection complexity.
Solution Approach 2:
By stacking plates in the vertical dimension, the patent creates multiple access planes for maintenance. Components connected to upper plates can be accessed from above, while components on lower plates are accessible from below or the sides. This multi-level arrangement provides multiple maintenance pathways, improving accessibility without requiring a complex disassembly structure.
3Ease of manufacture
If the refrigerant flow path unit is positioned horizontally, then component connection is simplified, but vibration transmission from the compressor increases
Solution Approach 1:
The patent employs asymmetric positioning of the stacked plate assembly relative to the compressor. Rather than symmetric horizontal placement that would transmit vibrations directly, the structure is oriented and positioned asymmetrically to disrupt vibration transmission paths. The stacked configuration itself creates an asymmetric mass distribution that helps isolate vibrations while maintaining practical connection arrangements.
Solution Approach 2:
The transition from horizontal to vertical stacking changes the orientation of the refrigerant flow path unit. This vertical arrangement in the height dimension separates the plate assembly from direct horizontal contact with the compressor, reducing vibration transmission through the mounting structure. The vertical stacking creates a different structural stiffness profile that filters vibrations more effectively while allowing simplified connection pathways.
Data Source
AI summary
A refrigeration apparatus includes: a refrigerant flow path unit that comprises plates stacked together, and in which a refrigerant flow path is disposed; first components that are functional components each including a driving unit; second components other than functional components; and a casing accommodating the refrigerant flow path unit, and the first and second components. The first components and the second components constitute a refrigerant circuit. The refrigerant flow path unit: has a first surface and a second surface on both sides in a normal direction of the plates, and is disposed in the casing in a posture with the first surface and the second surface being upstanding. The first components are connected to the first surface. The second components are connected to the second surface. The refrigerant flow path unit includes joint tubes that connect pipes linked to the second components.