Integrated Gas Leak Detector with Piezoelectric Pump
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Solution Overview
Problem
Existing gas-leak detectors for carrier gas in gas chromatographs are large, heavy, and have limited sensitivity due to separate arrangements of suction pumps and gas detection cells, leading to instability and reduced detection accuracy.
Innovation Solution
A compact gas-leak detector design with integrated suction pumps and thermal conduction-type gas detection sensors, featuring a cell with reduced capacity and dead volume, and a piezoelectric diaphragm pump to minimize pulsation, allowing for precise and stable gas detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If separate arrangements of suction pumps and gas detection cells are used, then device reliability is maintained, but device complexity and size increase
Solution Approach 1:
The suction pump and gas detection cell are integrated into a single compact unit where the pump is positioned directly adjacent to the cell. This merging reduces the number of separate components and connections, simplifying the overall structure while maintaining functional reliability through optimized gas flow paths.
2Measurement precision
If large capacity cells are used, then device reliability is maintained, but detection sensitivity decreases
Solution Approach 1:
The cell capacity is reduced to a small volume optimized for high sensitivity detection. This parameter change allows the detection system to respond more quickly and accurately to gas leaks while the integrated pump maintains stable operation to compensate for the smaller cell size.
3Reliability
If large suction capacity pumps are used, then gas flow is maintained, but pulsation increases causing operational instability
Solution Approach 1:
The pump is designed with locally optimized characteristics suitable for the specific application - a compact size with controlled suction capacity that minimizes pulsation. The pump's local design features and positioning create stable gas flow conditions without requiring large overall pump capacity.
4Volume of moving object
If integrated design is used, then size and weight are reduced, but manufacturing complexity increases
Solution Approach 1:
The integrated detector is manufactured using segmentation techniques where the pump and cell components are separately fabricated and then precisely assembled. This approach maintains manufacturing simplicity by allowing each component to be produced using optimized processes while achieving the benefits of integration in the final assembled unit.
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 integrated design enhances detection sensitivity and stability, reduces size and weight, and lowers manufacturing costs while maintaining high detection accuracy for carrier gas leaks.
Implementation Method 1
a piezoelectric element is disposed on one side of a diaphragm... The drive device is operated so as to apply a pulse voltage having a constant frequency to the piezoelectric element and cause the diaphragm to resonate
Implementation Method 2
thermal-conductivity-type gas sensors that detect the gasses... The bridge circuit electrically detects a change in the electric resistances of the sensors, the change corresponding to a change in the temperatures of the sensors caused by a difference between the thermal conductivities of the gasses
Data Source
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AI summary
A gas-leak detector includes a suction pump that sucks sample gas and reference gas, two gas detection sensors, and a cell block having a cell therein. The cell receives the gasses and has two suction-gas introduction channels and a single gas discharge channel opening thereinto. The gas-leak detector detects a gas leak on the basis of outputs from the sensors. The introduction channels and the discharge channel open into the cell at a first one of opposing surfaces of the cell, the opening of the discharge channel being arranged between the openings of the two introduction channels. The sensors are on the same plane as a second one of the opposing surfaces and are arranged between the opening of the discharge channel and the openings of the introduction channels. The suction pump is arranged on the cell block and communicates with the opening of the discharge channel.