Piezoelectric Transducer Cooling via Thermal Interface Layer
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Solution Overview
Problem
Current cooling methods for high-power piezoelectric transducers are inefficient, prone to overheating, and pose explosion and flame hazards, especially in environments with high humidity or flammable materials, as they require high air flow rates, bulky equipment, and are not effectively sealed, leading to potential arcing and damage.
Innovation Solution
A single, uniform heat-conducting layer of soft, rubbery material filled with fine, homogeneously dispersed high-thermal-conductivity powder is used to transfer heat from the transducer surfaces to an external heat sink, encapsulating the powder to prevent abrasiveness and ensuring electrical insulation, while maintaining a sealed environment to prevent moisture-related issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If air cooling method is used, then heat removal is achieved, but device complexity increases due to bulky equipment and explosion hazard increases in flammable environments
Solution Approach 1:
The patent extracts the cooling function from the transducer interior to the exterior by using a heat sink attached to the tail mass, eliminating the need for internal cooling channels and complex internal cooling structures
Solution Approach 2:
The patent introduces a heat sink as an intermediary component between the transducer and the environment, which serves as a dedicated heat removal device without requiring complex internal modifications to the transducer
2Temperature
If air cooling method is used, then heat removal is achieved, but reliability decreases due to moisture ingress and electrical arcing
Solution Approach 1:
The patent extracts the cooling function from the sealed transducer interior to the exterior, maintaining the seal integrity and preventing moisture ingress while still achieving effective heat removal
Solution Approach 2:
The patent uses the tail mass as a surrogate cooling surface, which is electrically isolated from the high-voltage piezoceramic elements, thereby copying the heat removal function away from the sensitive internal components
3Temperature
If heat pipe system is used, then heat removal is achieved, but applicability is limited to low-power transducers due to mechanical contact breakdown
Solution Approach 1:
The patent employs a simple thermally conductive interface material (such as thermal paste or pad) between the tail mass and heat sink, which is inexpensive and easily replaceable, avoiding the complexity and fragility of heat pipe systems
Solution Approach 2:
The patent changes the cooling approach from relying on precise mechanical contact (heat pipe) to using thermally conductive materials that accommodate thermal expansion and vibration, making the system adaptable to high-power applications
4Temperature
If liquid coolant is used, then heat removal efficiency increases, but parasitic heat generation increases due to cavitation
Solution Approach 1:
The patent replaces the liquid coolant system with a solid-state thermal conduction system using a heat sink and thermally conductive interface material, eliminating cavitation and the associated parasitic heat generation
Solution Approach 2:
The patent extracts the cooling liquid from the system entirely, using only solid components for heat removal, thereby eliminating the harmful effects of liquid-cavity interactions
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 enables continuous, stable operation of high-power piezoelectric transducers at high amplitudes in unfavorable environments by effectively dissipating heat without generating parasitic heat or causing arcing, ensuring reliable and durable performance.
Implementation Method 1
A single, uniform heat-conducting layer of a soft, rubbery material filled with a fine, homogeneously dispersed powder having high thermal conductivity is placed in contact with the transducer's side surface and its inner housing wall, and transmits the heat from the former to the latter
Data Source
AI summary
A sealed piezoelectric transducer having a single, uniform, electrically insulating, heat-conducting layer of a soft, rubbery material filled with a fine, homogeneously-dispersed powder having high thermal conductivity. The material is placed in contact with the surfaces of the transducer and conducts the heat from the surfaces to an external heat sink. Since the thermally conductive powder is fully encapsulated in the rubbery material, its abrasive properties are neutralized. The softness of the material ensures that the vibration of the transducer does not transmit significant acoustic energy into the material, thereby avoiding the generation of parasitic heat. In addition, the layer fills the entire gap between the transducer and the heat sink, thereby removing any possibility of moisture-related arcing.