Chassis Leakage Detection via Pneumatic Bubble Observation
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Solution Overview
Problem
Current methods for detecting leakage in chassis to certify them as waterproof and dustproof are time-consuming and expensive, requiring immersion in water and strict gas pressure control.
Innovation Solution
A method and system involving a sealed chamber, a water tank, and pressurized air to visually observe bubbles forming at the water's surface, indicating leaks in the chassis without immersion, using a compressor to deliver air between 10 kPa and 20000 kPa for 10 seconds to 180 seconds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the chassis is immersed in water for leakage detection, then the leakage can be detected, but the testing process becomes time-consuming due to drying requirements
Solution Approach 1:
The patent replaces the traditional water immersion method with a pneumatic pressure system. A compressor delivers pressurized air into the chassis, and leakage is detected by monitoring pressure changes or observing air flow through a water seal, eliminating the need for physical water immersion and subsequent drying time
Solution Approach 2:
The patent changes the testing parameter from liquid (water) to gas (pressurized air). This parameter change allows the leakage detection to be performed quickly without the drying requirement, while still maintaining detection accuracy through pressure differential measurement
2Measurement precision
If gas pressure is used for air tightness testing, then leakage detection is achieved, but the cost increases due to expensive gas pressure control equipment
Solution Approach 1:
The patent uses a simple water seal (water in a tube or container) as the detection medium instead of expensive electronic pressure control systems. The water seal is a low-cost, simple mechanism that effectively detects pressure changes indicating leakage, dramatically reducing equipment cost while maintaining detection accuracy
Solution Approach 2:
The patent uses a pneumatic system with a compressor and water seal to detect leakage. This approach uses readily available, inexpensive components (compressor, water, transparent tube) rather than costly electronic pressure controllers, achieving the same measurement precision at a fraction of the cost
3Measurement precision
If strict gas pressure and flow control is implemented, then accurate leakage detection is achieved, but the device complexity increases
Solution Approach 1:
The patent extracts and removes the complex electronic pressure control and flow regulation components from the system. Instead, it uses a simple mechanical water seal that passively indicates pressure changes, eliminating the need for complex control systems while maintaining detection accuracy
Solution Approach 2:
The water seal system is self-regulating and self-indicating. It automatically responds to pressure changes caused by leakage without requiring external control mechanisms, sensors, or complex instrumentation, thereby reducing device complexity while preserving measurement precision
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
Enables accurate, efficient, and inexpensive leakage detection in chassis, eliminating the need for extensive water immersion and costly gas pressure control equipment, supporting high-volume production testing.
Implementation Method 1
determining whether bubbles are formed at the bottom end of the pipe due to pressurized air flowing into the pipe
Implementation Method 2
determining presence of a leak in the chassis due to pressurized air flowing between the chassis and the sealed chamber
Data Source
AI summary
A method of detecting leakage within a chassis includes mounting the chassis on a plate disposed in a sealed chamber and fluidly connecting, by a pipe, an interior space of the sealed chamber to a water tank such that a bottom end of the pipe is under a surface of water in the water tank. The method further includes determining, such as observing, whether bubbles are formed at the bottom end of the pipe due to pressurized air flowing into the pipe. The method also includes determining presence of a leak in the chassis due to pressurized air flowing between the chassis and the sealed chamber, before flowing into the pipe.