Mixing Door Shaft Recesses for Vehicle HVAC Air Bypass Control
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Solution Overview
Problem
The existing air-conditioning units for motor vehicles face challenges in optimizing the shape and positioning of bypass passages for effective air mixing due to the molding process, leading to suboptimal temperature regulation.
Innovation Solution
An air conditioning unit with a mixing door featuring integrated bypass ducts and recesses on the shaft surface, allowing for precise regulation of air mixing by varying the shape and position of bypass passages along the door's length, independent of the molding constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If bypass passages are formed in the housing using conventional molding processes, then the housing structure is simple and easy to manufacture, but the shape and positioning of bypass passages cannot be optimized for effective air mixing
Solution Approach 1:
The bypass passage is segmented into multiple sections along the length of the mixing door, with each section having independently optimized shape and positioning. This allows the complex three-dimensional geometry to be achieved through additive manufacturing rather than conventional molding, resolving the contradiction between manufacturing precision and ease of manufacture.
Solution Approach 2:
The mixing door with integrated bypass passages is made movable and adjustable, allowing the shape and positioning of bypass passages to be optimized for different operating conditions. This dynamic capability enables precise regulation of air mixing while the additive manufacturing process makes such complex dynamic structures manufacturable.
2Productivity
If the bypass passage shape and position are fixed by housing molding, then manufacturing is simpler, but air mixing performance is suboptimal
Solution Approach 1:
The bypass passage is merged with the mixing door structure, creating an integrated component where the door itself forms part of the bypass passage. This integration allows complex geometries to be achieved through additive manufacturing of the door assembly, improving air mixing efficiency without requiring separate complex housing features.
Solution Approach 2:
The bypass passage extends in multiple dimensions along the length, height, and depth of the mixing door, creating a three-dimensional flow path that optimizes air mixing. Additive manufacturing enables this multi-dimensional complexity that would be difficult to achieve with conventional two-dimensional housing features.
3Adaptability or versatility
If bypass passages are integrated into the fixed housing, then the structure is simpler, but the air passage cannot be adjusted based on door position
Solution Approach 1:
The bypass passage is integrated with the movable mixing door rather than the fixed housing, making the air passage dynamically adjustable based on door position. As the door moves to different angles, the effective bypass passage area changes, providing automatic adaptation to different operating conditions while maintaining a relatively simple integrated structure.
Solution Approach 2:
The mixing door serves multiple functions: it acts as both the movable closure element and as part of the bypass passage structure. This multi-functionality provides adaptability for different air mixing requirements while avoiding the need for separate adjustment mechanisms, balancing versatility with structural simplicity.
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 solution enables improved air mixing and temperature control by allowing adjustable bypass passages that enhance the mixing of hot and cold air flows, providing more precise regulation and flexibility in air distribution within the vehicle.
Implementation Method 1
at least one recess configured to define a bypass air passage between the shaft of the door and the seat surface of the first wall is formed in the outer surface of the shaft
Implementation Method 2
a mixing door featuring integrated bypass ducts and recesses on the shaft surface, allowing for precise regulation of air mixing by varying the shape and position of bypass passages along the door's length
Data Source
Figure 1~3
Figure 4~5
Figure 6a~6d
AI summary
Air conditioning unit for a motor vehicle, comprising a door (50) mounted to a housing (C) of the air conditioning unit and rotatable about a rotation axis (x) to selectively open or close an air duct (10) formed in the housing (C) of the air conditioning unit, wherein the door (50) comprises a shaft (51) and a blade portion (52) extending from the shaft (51) of the door (50), and in an outer surface (51a) of the shaft (51) at least one recess (51b) is formed, which is configured to define a bypass air passage between the shaft (51) of the door (50) and a seat surface (11a) of a first wall (11) of the air duct (10).