Indoor Unit Front Panel Structure to Prevent Warping
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Solution Overview
Problem
The central part of a front panel in indoor air conditioning units warps when the panel is significantly inclined during operation, due to increased downward force, which is not effectively restrained by existing reinforcing ribs, leading to appearance issues and reduced durability.
Innovation Solution
The indoor unit design includes a front panel that moves horizontally and an outlet panel that closes the gap between the front panel and the casing, preventing air from being sucked into the gap and reducing the downward force on the central part of the front panel, while also being inclined to create a thinner appearance and increasing air volume through a wider inlet central part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the front panel is significantly inclined during operation to improve air flow, then air supply efficiency is improved, but the downward force on the central part increases causing warping
Solution Approach 1:
The front panel is divided into a fixed outer peripheral part and a movable central part. The outer peripheral part remains fixed to the casing while the central part can move forward independently, allowing the panel to be inclined for air flow without the entire panel warping under gravitational force.
Solution Approach 2:
The front panel transitions from a static structure to a dynamic one where the central part can move forward during operation. This dynamic adjustment allows the panel to achieve the optimal inclination angle for air flow while the movable design compensates for warping forces through controlled displacement rather than rigid resistance.
2Strength
If reinforcing ribs are added to improve strength and restrain warping, then structural strength is improved, but the appearance is spoiled due to denting during molding
Solution Approach 1:
The front panel is segmented into a fixed outer peripheral part that maintains appearance and a movable central part that provides structural functionality. This segmentation allows the smooth appearance to be preserved while the movable central part handles the mechanical stresses without requiring visible reinforcing ribs on the front surface.
Solution Approach 2:
The solution moves the structural reinforcement from the visual dimension (front surface with ribs) to the functional dimension (movable mechanism). The reinforcing function is achieved through the movable central part's connection mechanism and drive system rather than through surface features, eliminating appearance degradation.
3Productivity
If the front panel moves away from the casing to enable operation, then air intake is improved, but the gap allows air recirculation reducing efficiency
Solution Approach 1:
The front panel is divided into a fixed outer peripheral part that seals against the casing and a movable central part that moves for air intake. This segmentation allows the peripheral seal to prevent air recirculation in the gap while the central opening provides adequate air intake area during operation.
Solution Approach 2:
Different parts of the front panel have different functional qualities: the outer peripheral part maintains a sealed quality to prevent air leakage and recirculation, while the central part has an openable quality to allow air intake. This local differentiation of functional qualities resolves the contradiction between air intake and air recirculation prevention.
Data Source
Figure 1A~1C
Figure 2A~2B
Figure 3A~3B
AI summary
When a front panel moves away from a front surface of a casing, a central part of the front panel is warped. An indoor unit 1 of the present invention includes a casing 5, a front panel 7 provided forward of the casing 5, and a drive mechanism moving the front panel 7 away from the front surface of the casing 5. The front panel 7 is curved so that its central part protrudes forward. The drive mechanism moves the front panel 7 in a substantially horizontal direction.