Air Damper Orifice Geometry for Stable Glove Box Opening
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing air dampers for glove boxes in vehicles fail to maintain a consistent opening speed due to changes in orifice area caused by thermal expansion and non-linear damping forces, especially under varying loads and high-temperature conditions.
Innovation Solution
An air damper design featuring a cylinder with divided chambers, a piston, a guide rod with a slit, and a valve that adjusts the orifice area based on pressure differences, incorporating an inclined surface to linearly change the cross-sectional area and a slit to compensate for thermal expansion, ensuring consistent opening speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional orifice is used in the air damper, then the structure is simple, but the opening speed becomes inconsistent under varying loads and high-temperature conditions due to thermal expansion
Solution Approach 1:
The orifice is designed with a slit that allows dynamic adjustment of the opening area. The slit can change its effective width in response to thermal expansion of the valve body, maintaining consistent airflow characteristics despite temperature variations. This dynamic adaptation resolves the contradiction by making the orifice structure responsive rather than static.
Solution Approach 2:
The invention changes the geometric parameters of the orifice by introducing a slit with specific orientation and dimensions. The slit's width and orientation are designed to compensate for thermal expansion effects, allowing the orifice area to remain relatively constant across different temperature conditions while varying loads.
2Reliability
If the orifice area is fixed, then the manufacturing is simple, but the damping force becomes non-linear under varying loads
Solution Approach 1:
The slit in the orifice is designed with asymmetric geometry relative to the valve movement direction. This asymmetric configuration ensures that the effective orifice area changes in a controlled manner during valve movement, producing more linear damping characteristics across the full range of motion while maintaining manufacturability.
Solution Approach 2:
Instead of varying the orifice area in the traditional radial direction, the invention introduces a dimensional element by orienting the slit at a specific angle (e.g., 45 degrees) relative to the valve movement direction. This angular dimension allows the orifice area to change progressively during valve movement, achieving linear damping without complex manufacturing.
3Reliability
If thermal expansion is not compensated, then the design is simple, but the opening time increases excessively under high-temperature conditions
Solution Approach 1:
The slit in the orifice automatically compensates for thermal expansion through its geometric design. As the valve body expands due to heat, the slit's effective width adjusts accordingly, maintaining consistent airflow characteristics without requiring external compensation mechanisms. The structure serves its own thermal compensation function.
Solution Approach 2:
The invention deliberately designs the orifice slit to interact with thermal expansion effects rather than resist them. The slit geometry is configured so that thermal expansion of the valve body results in predictable changes to the effective orifice area, which are compensated for in the design to maintain consistent performance across temperature ranges.
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 air damper maintains a constant opening speed of the glove box by adjusting the orifice area and damping force, preventing excessive opening time under high temperatures and varying loads, and ensuring linear damping force changes.
Implementation Method 1
an elastic member positioned between the partition wall and the valve body
Implementation Method 2
a valve movably installed in the second chamber and configured to move in conjunction with a pressure difference between the first chamber and the second chamber
Implementation Method 3
an air damper, which may compensate for a change in an area of an orifice caused by thermal expansion of a component
Data Source
AI summary
An air damper includes: a cylinder; a partition wall dividing an internal space of the cylinder into a first chamber and a second chamber; a piston movably installed in the first chamber; a guide rod extending from the partition wall toward the second chamber and including a transfer hole connected to the first chamber and the second chamber; a valve movably installed in the second chamber and configured to move in conjunction with a pressure difference between the first chamber and the second chamber; an orifice positioned between the guide rod and the valve and connected to the second chamber and the transfer hole; and a slit provided on the guide rod or the valve and connected to the orifice.