Air Tightness Measurement for Aluminum Alloy Hubs
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Solution Overview
Problem
Existing methods for detecting the air tightness of aluminum alloy hubs, such as water-based and helium-based methods, require accurate but costly and non-reusable standard hubs, necessitating a more efficient and affordable solution for frequent and precise measurements, especially for small quantities of highly required vehicle wheels.
Innovation Solution
A detection device comprising a pressure measurement device, an inflation system with a flowmeter, and a data processing unit, including a single-chip microcomputer, which calculates leakage rates using the ideal gas state equation, allowing for precise and reusable air tightness testing of aluminum alloy hubs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If helium-based air-tightness detection method is used, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces the complex helium mass spectrometer system with a simpler pressure-based detection system. Instead of using helium gas and mass spectrometry, the invention uses ordinary air pressure measurement with a pressure sensor to detect leakage, thereby reducing device complexity while maintaining measurement capability
Solution Approach 2:
The patent changes the detection parameter from helium concentration (requiring mass spectrometer) to pressure change over time (measurable with simple pressure sensor). By monitoring pressure decay rate, the system achieves air tightness detection without requiring complex helium-based equipment
2Measurement precision
If air-tightness standard hub is used for calibration, then measurement precision is improved, but cost increases and reliability decreases due to wear and damage
Solution Approach 1:
The patent creates a virtual standard through software calculation rather than relying on a physical standard hub. By using the pressure decay method and calculating leakage rate from pressure change over time, the system establishes a computational reference that doesn't require a physical standard hub, eliminating wear and damage issues
Solution Approach 2:
The patent replaces the expensive, fragile, and wear-prone standard hub with a software-based calculation method. The 'standard' becomes a computational algorithm rather than a physical object, eliminating the need for costly manufacturing and frequent replacement of standard hubs
3Measurement precision
If frequent replacement of standard hub is performed, then measurement precision is maintained, but loss of time and productivity decrease
Solution Approach 1:
The patent replaces the physical standard hub with a software-based reference system. The detection algorithm uses pressure decay characteristics to determine air tightness without requiring comparison against a physical standard, eliminating the need for frequent standard hub replacement and associated downtime
4Device complexity
If water-based air-tightness detection method is used, then device complexity is reduced, but measurement precision decreases
Solution Approach 1:
The patent replaces the visual observation method (water-based bubble detection) with an electronic pressure sensing system. Instead of relying on human visual inspection of air bubbles in water, the system uses a pressure sensor to automatically detect and quantify pressure changes, thereby improving precision while keeping the device relatively simple
Solution Approach 2:
The patent changes the detection parameter from visual observation of air bubbles (qualitative) to quantitative pressure measurement. By measuring pressure decay rate over time, the system provides numerical data for air tightness assessment, improving measurement precision while maintaining simple device 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
The solution provides a simple, accurate, and cost-effective method for detecting air tightness, achieving leakage rates as low as 10−12 to 10−13 Pa*m3/s, suitable for routine calibration of helium-based detection devices and meeting production requirements with high accuracy and convenience.
Implementation Method 1
a pressure measurement device (3) mounted into a hub (1) or tyre (2) to be measured
Implementation Method 2
an inflation device in gas connection with the inside of a tyre (2) of a wheel to be measured, wherein the inflation device comprises a flow measurement component
Implementation Method 3
calculates leakage rates using the ideal gas state equation
Data Source
AI summary
The present invention provides a device for measuring air tightness of an aluminum alloy hub or a tire and a method for measuring the air tightness of the aluminum alloy hub or the tire by using the device. The device includes a pressure measurement device mounted into a hub or tire to be measured, an inflation device in gas connection with an inside of a tire of a wheel to be measured, and a data acquiring and processing device; wherein the inflation device includes a flow measurement component.