Ultrasonic Wave Generation Ventilation Hole Positioning
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Solution Overview
Problem
Ultrasonic wave generation apparatuses face durability issues when a ventilation hole is provided for temperature management, as it can lead to stress and potential cracking due to impacts, and existing designs do not effectively balance ventilation with durability.
Innovation Solution
The apparatus includes a ventilation hole in the frame body that allows communication between the interior and exterior, positioned in a way that minimizes stress on the frame body by ensuring the ventilation hole does not overlap with the connecting member, and the frequency of resonance within the ventilation hole differs from the emitted ultrasonic waves, reducing sound pressure drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a ventilation hole is provided in the frame body to enable the inner space to communicate with the exterior, then the risk of damage from water vapor expansion at high temperatures is reduced, but the durability drops due to stress from impacts causing cracks
Solution Approach 1:
The patent applies local quality by providing the ventilation hole at a specific location on the frame body where it is less susceptible to impact stress. The hole is positioned in a region that maintains structural integrity while still allowing ventilation, thus locally optimizing the balance between ventilation function and durability.
Solution Approach 2:
The patent implements preliminary action by pre-positioning the ventilation hole in an optimized location before the apparatus is subjected to impact conditions. This predetermined placement ensures that the hole does not become a stress concentration point during subsequent impact events, preventing cracks while maintaining ventilation functionality.
2Stability of the object's composition
If the groove or through-hole is closed off by bonding piezoelectric vibrators, then the inner space is sealed, but the ultrasonic wave generation element is damaged due to expansion of water vapor at high temperatures
Solution Approach 1:
The patent applies segmentation by dividing the sealing function into two parts: the groove or through-hole provides the sealing path, while the separately positioned ventilation hole provides the pressure equalization path. This segmentation allows the inner space to remain sealed from water vapor while enabling controlled communication with the exterior for pressure management.
Solution Approach 2:
The ventilation hole acts as an intermediary element that mediates between the sealed inner space and the exterior environment. It allows pressure equalization and water vapor escape without compromising the primary sealing function, thus protecting the piezoelectric vibrators from damage while maintaining the sealed structure.
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 design prevents damage from high temperatures and impacts while maintaining durability by strategically positioning the ventilation hole and ensuring non-overlapping stress distribution, thus enhancing the apparatus's performance and longevity.
Implementation Method 1
Piezoelectric elements are bonded to outer side portions of the parts of both main surfaces of the support body that are constituted by the elastic material. The first piezoelectric vibrator and the second piezoelectric vibrator vibrate at opposite phases from each other
Implementation Method 2
a part of each of main surfaces of the support body is constituted by an elastic material... This acoustic emission opening is formed in a side surface of the support body
Implementation Method 3
The first piezoelectric vibrator and the second piezoelectric vibrator vibrate at opposite phases from each other, and as a result, the ultrasonic wave generation element vibrates in a buckling tuning-fork vibration mode. The ultrasonic wave generation apparatus emits ultrasonic waves generated by the vibration of this ultrasonic wave generation element
Data Source
AI summary
An ultrasonic wave generation apparatus that includes an ultrasonic wave generation element having an inner space formed by bonding first and second vibrators so as to close off a through-hole or a groove provided in a frame body, and a connecting member that is bonded to the second vibrator supports the ultrasonic wave generation element and is electrically connected to at least one of the first and second vibrators. A ventilation hole that opens into a first side surface of the frame body and that allows the inner space to communicate with the exterior is provided in the frame body. When a direction parallel to the first main surface or the second main surface is a lengthwise direction, an outer side end portion of the ventilation hole in the lengthwise direction and an inner side end portion in the lengthwise direction of the connecting member do not match.