Support for fixing a turret for extracting a fluid flow, system for extracting a fluid flow and control method
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Solution Overview
Problem
Existing air extraction systems for masonry ducts in old buildings face challenges with air flow disturbances and unreliable pressure measurements, leading to inefficient stale air extraction and energy loss, particularly at low pressures.
Innovation Solution
A mounting bracket with a curved internal edge and pressure measurement sites positioned at the convex curvature, reducing air flow disturbances and allowing for precise pressure measurements, which enables the establishment of a reliable mathematical model for regulating fan speed and optimizing air extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional air extraction turret with a shell spacer is used, then the fan can be mounted on the masonry duct outlet, but significant airflow disturbances occur at the duct outlet and within the fan shell, causing unreliable pressure measurements and air leakage
Solution Approach 1:
The invention removes the shell spacer component that was creating the gap between the fan lower wall and the intake opening. By eliminating this spacer, the fan is positioned directly at the masonry duct outlet, eliminating the source of airflow disturbances and preventing external air from leaking into the extraction system.
Solution Approach 2:
The invention introduces a curved transition piece with a specific curvature radius (R1 between 50-150mm and R2 between 25-75mm) at the duct outlet. This curved geometry smoothly guides the airflow from the rectangular duct outlet into the circular fan intake, reducing turbulence and airflow disturbances that would otherwise occur at the interface.
2Measurement precision
If pressure measurement is performed at the duct outlet with high flow rates and low pressure, then extraction monitoring is possible, but air influx through the shell gap distorts the pressure sensor measurements
Solution Approach 1:
The invention eliminates the shell spacer that created the measurement-distorting air gap. By removing this component and positioning the fan directly at the outlet, the source of measurement distortion is eliminated, allowing accurate pressure sensing without air leakage interference.
Solution Approach 2:
The curved transition piece acts as an intermediary component between the rectangular duct outlet and the circular fan intake. It provides a smooth airflow path that prevents turbulence and ensures stable pressure conditions at the measurement location, enabling accurate pressure sensing.
3Ease of manufacture
If the fan is positioned with a shell spacer creating a gap, then mounting is simplified, but external air with higher pressure rushes into the fan from the environment, reducing extraction efficiency
Solution Approach 1:
The invention removes the shell spacer component entirely, eliminating the gap that allowed external air leakage. The fan is mounted directly at the masonry duct outlet, ensuring that only air from the duct enters the fan, thereby maintaining extraction efficiency.
Solution Approach 2:
The curved transition piece with optimized radius creates a smooth aerodynamic path that efficiently channels all extracted air through the fan. This curved geometry maximizes extraction efficiency by preventing air short-circuiting and ensuring complete utilization of the fan's suction capacity.
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 precise and reliable pressure measurements, enabling efficient air extraction at low pressures, reducing energy consumption by up to 5 times and improving the overall extraction yield.
Implementation Method 1
a curved internal edge and pressure measurement sites positioned at the convex curvature, reducing air flow disturbances
Implementation Method 2
the mounting support comprising at least one pressure measurement site which is positioned at the inner edge between the upper and lower face of the annular body, the pressure measurement site allowing the pressure of the fluid flow through the central opening to be measured
Data Source
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AI summary
The invention relates to a mounting bracket (10) for an extraction turret (20) conveying a fluid flow to a masonry extraction duct (30) for the fluid flow. According to the invention, the mounting bracket (10) comprises, on the one hand, at least one pressure measuring site (40) positioned to be exposed to the flow of a fluid stream in order to measure its pressure, and on the other hand, an aerodynamic disturbance reducer disposed near the pressure measuring site (40). The invention also relates to an extraction system comprising the mounting bracket (10) and a fan (200), the method for regulating the fan's rotational speed also being the subject of the invention.