Vibration Sensing Assembly Pressure Balancing
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Solution Overview
Problem
Current vibration sensing assemblies face challenges in achieving high performance and precision due to limitations in design and pressure balancing, leading to suboptimal sensitivity and volume efficiency.
Innovation Solution
The proposed vibration sensing assembly incorporates a base, side shell, sensor, and diaphragm assembly with a unique cavity and airflow channel structure that balances pressure between cavities, eliminating the need for an additional outer shell and enhancing sensitivity through a diaphragm assembly with a mass block and annulus connector, while using a control chip and circuit board for electrical connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a traditional vibration sensing assembly design is used, then the structure is simple, but the sensitivity and performance are insufficient
Solution Approach 1:
The assembly is divided into multiple functional cavities (first cavity, second cavity, third cavity) separated by partitions, with each cavity serving specific functions for pressure balancing and sensing, thereby improving sensitivity through structured segmentation
Solution Approach 2:
The first cavity, second cavity, and third cavity are nested within each other through the base, side shell, and upper cover structure, creating a compact multi-chamber design that enhances performance without proportionally increasing overall volume
2Measurement precision
If pressure is not balanced between cavities, then the structure is simple, but the diaphragm movement is restricted and performance deteriorates
Solution Approach 1:
The airflow channel connects the first cavity and third cavity through the second cavity, enabling pressure equalization via fluid (air) flow, which ensures smooth diaphragm movement by maintaining pressure balance across the sensing assembly
Solution Approach 2:
The second cavity acts as an intermediary chamber between the first and third cavities, with the airflow channel serving as a mediator to transfer pressure changes and maintain equilibrium, thereby facilitating smooth diaphragm operation
3Reliability
If an additional outer shell is used, then the assembly is better protected, but the volume increases
Solution Approach 1:
The base, side shell, and upper cover are merged into an integrated outer shell structure that simultaneously provides mechanical protection and defines the internal cavity geometry, eliminating the need for separate protective housing and reducing overall volume
Solution Approach 2:
The outer shell formed by the base, side shell, and upper cover serves multiple functions: it provides structural protection, defines the first, second, and third cavities, and creates the airflow channels, thereby achieving protection without additional volume increase
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 improves sensitivity and reduces volume by balancing pressure within the assembly, allowing for smoother diaphragm movement and enhanced performance, including better low-frequency curve performance, without the need for an external shell.
Implementation Method 1
The first cavity of the vibration sensing assembly of the disclosure is communicated with the third cavity through the airflow channel to better balance the pressure in the first cavity and the third cavity
Data Source
AI summary
A vibration sensing assembly, including a base, a side shell, a sensor, an upper cover, and a diaphragm assembly, is provided. The base includes first and second bottom plates. A first cavity is formed between the first and second bottom plates. The second bottom plate includes first and second through holes. The side shell is disposed on the second bottom plate and includes a cylinder and an inner partition. The inner partition divides the cylinder into a second cavity and an airflow channel. The airflow channel is communicated with the first cavity through the first through hole. The sensor is disposed in the second cavity and covers the second through hole. The side shell is located between the base and the upper cover. The base, the side shell, and the upper cover jointly form an outer shell. The diaphragm assembly is disposed between the side shell and the upper cover.