Air-Conditioning Indoor Unit Control Box Hinge for Drain Pan Access
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Solution Overview
Problem
Conventional ceiling cassette type two-way airflow air-conditioning indoor units require removal of on-site and internal wiring from the control box to detach the drain pan, complicating maintenance and reducing its detachability.
Innovation Solution
A hinge assembly is installed on the casing's side plate, allowing the control box to be coupled and decoupled from the drain pan inlet-outlet port without separating from the casing, enabling the drain pan to be removed by pivoting the control box, thus eliminating the need to disconnect wiring during maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the control box is screw-fixed to the drain pan for stable mounting, then the control box is securely positioned, but the drain pan cannot be removed without disconnecting wiring
Solution Approach 1:
The mounting structure is divided into two independent parts: the control box mounting to the casing, and the drain pan mounting to the casing. This segmentation allows the drain pan to be detached without affecting the control box position, resolving the contradiction between mounting stability and drain pan detachability.
Solution Approach 2:
The casing serves as an intermediary structure that independently supports both the control box (via side plate mounting) and the drain pan (via bottom mounting). This intermediary structure enables both components to be securely mounted while allowing independent removal of the drain pan without wiring disconnection.
2Volume of moving object
If the control box is placed on the underside of the drain pan for compact arrangement, then space utilization is improved, but maintenance complexity increases due to wiring connections
Solution Approach 1:
The mounting locations are segmented and redistributed: the control box is mounted to the side plate while the drain pan is mounted to the bottom of the casing. This spatial segmentation separates the control box from the drain pan, eliminating wiring connections between them and reducing maintenance complexity while still achieving compact arrangement within the casing volume.
3Ease of operation
If the control box is removed from the drain pan for drain pan removal, then drain pan detachability is improved, but control box reinstallation complexity increases
Solution Approach 1:
The mounting system is segmented into independent control box mounting (to side plate) and drain pan mounting (to bottom). This eliminates the need to remove or reposition the control box when removing the drain pan, as they are mounted to different locations. The control box remains in place while the drain pan is simply unclipped from the bottom mounting positions.
Data Source
AI summary
An air-conditioning indoor unit includes: a heat exchanger of a refrigerant circuit; a drain pan installed below the heat exchanger; a fan configured to send air to the heat exchanger; a control box containing control parts configured to control operation of the fan and other components; and a casing, in which the heat exchanger, drain pan, fan, and control box are stored in the casing, a drain pan inlet-outlet port is formed in the casing, a hinge assembly is installed on a side plate of the casing, and the control box is coupled to the casing so as to be able to be taken in and out of the drain pan inlet-outlet port of the casing. This allows the drain pan to be attached and detached to and from the casing by removing internal wiring from the control box without removing the control box from the casing.