Asymmetric Inclined Pressure Sampling Head for High-Precision Pitot Tube Flow Measurement
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Solution Overview
Problem
Conventional Pitot tube flow sensors have low precision due to the low precision of their pressure sampling heads, limiting the measurement precision class to 0.5-1.0 when measuring volume flow rates in pipes or conduits.
Innovation Solution
A high-precision pressure sampling head with inclined surfaces forming total and static pressure sensing holes, where the angle between the inclined surfaces and the axis of the cylindrical body is optimized to enhance differential pressure measurement precision, allowing for a more stable fluid flow and improved data collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional pressure sampling head is used in a Pitot tube flow sensor, then the device is simple to manufacture, but the measurement precision is limited to 0.5-1.0
Solution Approach 1:
The pressure sampling head employs asymmetric inclined surfaces instead of symmetric circular openings. The first inclined surface has an angle α with the axis, while the second inclined surface has a different angle β, creating asymmetric pressure sampling geometry that improves measurement precision by reducing flow disturbance and enhancing differential pressure detection accuracy.
Solution Approach 2:
The invention optimizes specific geometric parameters including the angles α and β of the inclined surfaces, the dimensions of the pressure sensing holes, and the relative positions of the total and static pressure channels. These parameter optimizations enable the pressure sampling head to achieve measurement precision of 0.2-0.5 while maintaining reasonable manufacturing complexity.
2Measurement precision
If the pressure sampling head uses inclined surfaces with optimized angles, then measurement precision improves to 0.2-0.5, but the manufacturing complexity increases
Solution Approach 1:
The invention specifies optimized angle ranges for the inclined surfaces (α and β) that balance measurement precision with manufacturability. By defining specific angle parameters and their relationships, the design achieves high measurement precision (0.2-0.5) while providing clear manufacturing guidelines that control the required precision levels.
Solution Approach 2:
The pressure sampling head is divided into distinct functional components including the first inclined surface for total pressure sensing, the second inclined surface for static pressure sensing, and separate pressure sensing holes. This segmentation allows each component to be optimized and manufactured independently, reducing the cumulative effect of manufacturing tolerances.
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 high-precision pressure sampling head increases measurement precision to 0.2-0.5, significantly improving the accuracy of volume flow rate measurements in Pitot tube flowmeters.
Implementation Method 1
Pitot tube flow sensors were invented based on the Pitot tube theory discovered by French scientist Henri Pitot
Implementation Method 2
The flow totalizer then calculates volume flow rate of the fluid flow based on the data and a Bernoulli equation
Data Source
AI summary
Present invention provides a high-precision pressure sampling head used in a Pitot tube flow sensor. The pressure sampling head includes a cylindrical pressure sampling head body. The cylindrical pressure sampling head body contains a total pressure channel and a static pressure channel. The axis of the total pressure channel and the axis of the static pressure channel are parallel to the axis of the cylindrical pressure sampling head body. Two inclined surfaces are formed on two opposite sides of the lower end of the cylindrical pressure sampling body. A first inclined surface intersects with the total pressure channel and thus a total pressure sensing hole is formed on the first inclined surface. A second inclined surface intersects with the static pressure channel and thus a static pressure sensing hole is formed on the second inclined surface. An angle α formed between the first inclined surface and the axis of the cylindrical pressure sampling head body is smaller than the angle β formed between the second inclined surface and the axis of the cylindrical pressure sampling head body. Based on experimental results, when measuring the volume flow rate of a liquid in a pipe or conduit using the pressure sampling head according to the present invention, the fluid can flow stably through the pressure sampling head, with a high differential pressure between the total pressure sensing hole and the static pressure sensing hole. Thus, a pressure differential measuring device can more easily collect the data and achieve a higher precision of measurement. The measurement precision class can reach between 0.2-0.5.