Right-left air flow direction control device and air-conditioning apparatus indoor unit provided with the same
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Solution Overview
Problem
Existing air flow direction control devices for air-conditioning apparatuses experience vibrations during frontward air blowing due to unequal pressures on planar portions, leading to turbulence and chatter, which affects the operation's quietness and efficiency.
Innovation Solution
A right-left air flow direction control device with a connecting rod mechanism that includes contact raised parts and connection protrusions, allowing for three-point bending and frictional integration of deflectors with the connecting rod during frontward air blowing, while minimizing friction during lateral air blowing to facilitate easy rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the planar portions are oriented to the front side for frontward air blowing, then the air flow direction control is improved, but vibrations and chatter occur due to unequal pressures on both surfaces of the planar portion
Solution Approach 1:
A damper is introduced as an intermediary component between the planar portion and the connecting rod. This damper absorbs the unequal pressures generated during frontward air blowing and prevents them from directly transmitting to the planar portion, thereby eliminating vibrations and chatter while maintaining effective air flow direction control
Solution Approach 2:
The damper changes the mechanical parameter of the connecting rod by introducing a damping element that modifies the pressure transmission characteristics. This parameter change allows the system to tolerate unequal pressures without generating vibrations, resolving the contradiction between operational effectiveness and stability
2Stability of the object's composition
If friction is increased to suppress vibrations during frontward air blowing, then vibration stability is improved, but the driving motor capacity must be increased to overcome the additional friction during lateral air blowing
Solution Approach 1:
The damper is positioned locally at the connection point between the planar portion and connecting rod, providing friction only where needed to suppress vibrations during frontward air blowing. This localized application of friction does not significantly increase the overall driving motor capacity required for lateral air blowing operations
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
The solution effectively suppresses vibrations during frontward air blowing, ensuring quiet operation and reduces the required capacity of the driving motor, while allowing easy rotation during lateral air blowing without increasing motor capacity.
Implementation Method 1
the connecting rod undergoes 'three-point bending' in a plane perpendicular to the longitudinal direction
Implementation Method 2
friction acts between the right-left deflector and the connecting rod at the contact points
Data Source
Figure 1
Figure 2
Figure 3(a)~3(b)
AI summary
A right-left air flow direction control device (100) includes right-left deflectors (10) and connecting rods (20). Each right-left deflector (10) includes a base portion (13) defining a plane perpendicular to the center A of rotation of a rotation shaft (11), a planar portion (12), and a connection protrusion (15) extending from the base portion (13). Each connecting rod (20) includes a rod body (21), connection holes (25), rod body extended portions (22) arranged in one side edge (21 d) of the rod body (21) so as to correspond to the connection holes (25), respectively, and contact raised parts (23) arranged along the edges of the rod body extended portions, respectively, the contact raised parts being higher than the rod body (21). Upon frontward air blowing, parts near the connection holes (25) of the connecting rod (20) are held by the respective connection protrusions (15) while being prevented from separating from the connection protrusions (15) and the tops of the contact raised parts (23) and parts near the other side edge are in contact with the respective base portions (13), so that the connecting rod (20) undergoes bending deformation.