Differential Pressure Gauge Diaphragm Static Pressure Deformation
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Solution Overview
Problem
Conventional differential pressure gauges suffer from a decreased signal-to-noise (S/N) ratio due to adverse effects of static pressure, which causes diaphragm deformation even in the absence of differential pressure, leading to noise and reduced accuracy.
Innovation Solution
A differential pressure gauge design featuring a diaphragm layer with a pressure-receiving portion and a through-hole, where a wall with gaps is placed between the pressure-receiving portion and the through-hole within the second pressure chamber, reducing the area difference and minimizing diaphragm deformation under static pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the first sub-chamber area is different from the second sub-chamber area to enable differential pressure measurement, then the differential pressure measurement function is achieved, but the diaphragm deforms under static pressure causing noise and decreasing the S/N ratio
Solution Approach 1:
The second pressure chamber is divided into a first region and a second region by introducing a partition wall, creating distinct functional zones that balance the pressure distribution on the diaphragm while maintaining differential pressure measurement capability
Solution Approach 2:
The partition wall is positioned at a specific location within the second pressure chamber to locally adjust the pressure distribution, balancing the forces on the diaphragm without affecting the overall differential pressure measurement function
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 effectively suppresses the decrease in S/N ratio by reducing diaphragm deformation under static pressure, improving measurement accuracy and reducing noise.
Implementation Method 1
on which a piezoresistive element is formed
Data Source
AI summary
A differential pressure gauge of the invention contains: a diaphragm layer disposed between first and second parts; and a wall between a first region on a pressure-receiving portion side and a second region on a first through-hole side within a second pressure chamber. The diaphragm layer covers the pressure-receiving portion over a first pressure chamber and has the first through-hole with one end disposed in the second pressure chamber away from the pressure-receiving portion. The wall is disposed with gaps formed from inner walls of the second pressure chamber. The first pressure chamber is formed through the first part, the second pressure chamber has an opening facing the diaphragm layer, the first part has a second through-hole continuing to the first through-hole, and a base has a third through-hole with one end disposed in the first pressure chamber and a fourth through-hole continuing to the second through-hole.