Indoor unit and refrigeration cycle apparatus
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Solution Overview
Problem
The existing ceiling cassette indoor units for air-conditioning systems face challenges in performing operations such as pipe work and electrical wiring due to limited space, as the main unit is mounted above the ceiling before the ceiling is covered, making it difficult to access and manage the refrigerant, drain, and electrical components effectively.
Innovation Solution
The indoor unit design includes an electrical component box, refrigerant pipe connection portions, and a drain pipe connection portion on the same mounting surface, positioned closer to the operator, with installation bolt attachment brackets that do not obstruct the workspace, allowing for easier access and visibility during installation and maintenance, and the refrigerant and drain pipe connections are installed perpendicular to the mounting surface to facilitate insulation and prevent air leaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the main unit is mounted above the ceiling before the ceiling is covered, then the installation structure is stable, but the space for operations such as pipe work and electrical wiring is limited
Solution Approach 1:
The patent positions the refrigerant pipe connection portion, drain pipe connection portion, and electrical component box on a mounting surface that extends toward the room interior (a different spatial dimension), allowing operations to be performed from the room side rather than from above the ceiling, thus resolving the contradiction between installation stability and operation space
2Device complexity
If the refrigerant pipe connection portion, drain pipe connection portion, and electrical component box are positioned on the main unit, then the components are integrated, but the installation bolts and brackets obstruct the working space
Solution Approach 1:
The patent extends the mounting surface from the main unit toward the room interior, creating additional spatial depth that accommodates all connection portions and electrical components while positioning them away from the installation bolts and brackets, thus eliminating obstruction to working space while maintaining component integration
3Ease of operation
If the mounting surface is positioned closer to the operator, then the visibility and accessibility of components is improved, but the structural compactness is reduced
Solution Approach 1:
The patent segments the indoor unit into distinct functional zones: the main unit containing core components, and an extended mounting surface serving as a dedicated operation zone for connections and electrical components, allowing compactness of the main unit while providing accessible mounting surface
Data Source
AI summary
An indoor unit includes a main unit including an air inlet through which air enters from a room and an air outlet through which air blows into the room, an electrical component box mounted on an outer surface of the main unit and accommodating an electrical device, a refrigerant pipe connection portion to which a refrigerant pipe through which refrigerant passes is connected, a drain pipe connection portion to which a drain pipe through which drain water discharged from the main unit passes is connected, and an installation bolt attachment bracket mounted on the outer surface of the main unit and fixing the main unit to an installation bolt suspended from above a ceiling. The indoor unit has the refrigerant pipe connection portion, the drain pipe connection portion, and the electrical component box on the same mounting surface.