Flow Sensor Multiple Passages Throttle Point Segmentation
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Solution Overview
Problem
Existing flow sensors have flow resistance in both the main and secondary channels that depend on flow rate, pressure, and temperature, leading to inaccurate measurements and potential turbulence issues at high flow rates.
Innovation Solution
The flow sensor features multiple passages at the main channel throttle point, allowing for adjustable division ratios between the main and measuring channels, reducing fluidic resistance and preventing turbulent flows, while maintaining laminar conditions in the measuring channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single throttle point is arranged in the main channel or measuring channel, then the flow can be throttled, but the flow resistance depends on flow rate, pressure, and temperature, leading to inaccurate measurements
Solution Approach 1:
The throttle point in the main channel is divided into multiple passages instead of a single passage. This segmentation allows the flow to be distributed across multiple paths, reducing the dependency of flow resistance on flow rate, pressure, and temperature variations, thereby improving measurement accuracy and reliability.
Solution Approach 2:
Different passages in the throttle point can have different cross-sectional areas, allowing local optimization of flow characteristics. This enables precise control over the division ratio between main channel and measuring channel flows, ensuring stable and accurate measurements under varying operating conditions.
2Speed
If the cross section of the measuring channel is reduced to increase flow speed, then the measuring range may be exceeded, but if increased, then turbulence may occur
Solution Approach 1:
The throttle point is segmented into multiple passages with different cross-sectional areas. This allows the flow to be distributed in a controlled manner, maintaining laminar flow conditions in the measuring channel while preventing excessive turbulence in the main channel, thus avoiding measurement errors.
Solution Approach 2:
By varying the cross-sectional areas of different passages in the throttle point, the flow division ratio between main channel and measuring channel can be optimized. This enables maintaining appropriate flow speeds without exceeding the measuring range or generating harmful turbulence.
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 ensures that the flow rate division ratio is independent of pressure and temperature, allowing for accurate measurements across varying flow rates without exceeding the measuring range, and reduces turbulence in the main channel.
Implementation Method 1
The throttle point in the main channel increases the flow speed in the main channel and also causes a pressure change in the main channel depending on its cross section
Implementation Method 2
Laminar flows prevail in the first section, which is in the flow direction of the medium before the throttle point
Implementation Method 3
turbulent flow effects are present in the second section, which is after the throttle point
Data Source
Figure 1~2b
Figure 3a~4b
Figure 5a~6b
AI summary
The sensor has a sensor housing in which a flow channel extends between an inlet channel (15) and an outlet channel (16). The flow channel has a measuring channel (3) parallely connected to a main channel (2). A main channel orifice (17) is arranged in the main channel. The measuring channel has a sensor element for measuring flow of a gaseous or liquid medium. The main channel orifice has passages (19) between the inlet channel and the main channel and/or between the main channel and the outlet channel. The passages extend along a flow direction parallel to each other.