Adjustable Thermal Vent Assembly for Dynamic Open Air Ratio Control
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Solution Overview
Problem
Conventional thermal vent designs in electronic devices are restricted by safety regulations, limiting the open air ratio (OAR) to 40-50%, which impairs airflow and thermal performance due to fixed grating spacings that must be less than 1 mm to prevent rod-shaped objects from being inserted, thereby restricting thermal design power (TDP).
Innovation Solution
An adjustable thermal vent assembly that uses a movable shutter plate to dynamically adjust the grating spacing based on detected triggering conditions, increasing the OAR when the vent is inaccessible, such as when a laptop is placed on a surface or the display lid is closed, ensuring compliance with safety regulations by maintaining an overlapping grating spacing of less than 1 mm when accessible.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed grating spacing of less than 1 mm is used to comply with safety regulations, then safety compliance is achieved, but thermal performance deteriorates due to restricted airflow
Solution Approach 1:
The patent implements a movable shutter plate that can dynamically adjust the grating spacing between two gratings. The shutter plate moves between a first position (providing less than 1 mm spacing for safety compliance) and a second position (providing greater than 1 mm spacing for enhanced airflow). This dynamic adjustment mechanism allows the system to switch between safety mode and performance mode based on operational conditions, resolving the contradiction between safety compliance and thermal performance.
2Device complexity
If fixed grating spacing is used to simplify the design, then device complexity is reduced, but adaptability deteriorates as the vent cannot adjust to different usage conditions
Solution Approach 1:
The vent structure incorporates a movable shutter plate that can transition between fixed positions, providing both simplicity and adaptability. The shutter plate is guided by slots in the housing and can be actuated by triggering mechanisms (such as pressure-sensitive switches or temperature sensors) that detect different usage conditions. This allows the relatively simple structure to adapt dynamically to various operational states, achieving both low complexity and high adaptability.
Solution Approach 2:
The patent implements self-service through automatic triggering mechanisms that detect usage conditions (such as device orientation, surface contact, or temperature thresholds) and automatically actuate the shutter plate to the appropriate position. This eliminates the need for manual intervention or complex control systems, allowing the vent to self-adjust based on environmental conditions while maintaining structural simplicity.
3Productivity
If movable shutter plate mechanism is added to adjust grating spacing, then thermal performance is improved, but device complexity increases
Solution Approach 1:
The vent assembly is segmented into distinct functional components: a stationary housing with integrated gratings, a movable shutter plate, and a triggering mechanism. The shutter plate itself is segmented to fit within slots in the housing, allowing independent movement. This segmentation enables the complex function of adjustable grating spacing to be achieved through relatively simple, modular components that can be manufactured and assembled using standard techniques, minimizing the overall complexity increase.
Solution Approach 2:
The shutter plate is nested within the housing structure, fitting into slots that are integral to the housing design. The gratings are nested on opposite sides of the shutter plate, creating a compact layered structure. This nesting arrangement eliminates the need for separate mounting brackets, fasteners, or external adjustment mechanisms, thereby reducing the complexity increase that would otherwise result from adding the movable shutter functionality.
Data Source
AI summary
Techniques are described to dynamically adjust the open air ratio (OAR) while ensuring compliance with regulatory requirements. An adjustable thermal vent assembly is described that dynamically adjusts the OAR for inlet/outlet vents depending on the current use case. The adjustable thermal vent assembly functions to increase the grating spacing only when a triggering condition is met that ensures that a corresponding thermal vent location is inaccessible. Such temporarily inaccessible regions may include the bottom cover of an electronic device when positioned on the surface of an object, for thermal intake vents, or the rear portion of an electronic device when the display cover exceeds a predetermined angle, for thermal exhaust vents.