Acute-Angled Blade Sensor for Reduced Pressure Loss
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Solution Overview
Problem
Conventional pressure/temperature sensors with four blades arranged at equal angles around a tubular port face challenges in consistently drawing the measuring medium, leading to varying pressure loss and reduced temperature detection accuracy due to the orientation of blades relative to the flow direction, resulting in inefficient medium flow and increased pressure differences.
Innovation Solution
A pressure/temperature sensor design featuring a holding member with a tube that includes an introduction portion with radially arranged blades having acute angles, ensuring the acute-angled portions face the flow direction regardless of blade orientation, thereby optimizing medium flow and reducing pressure loss by minimizing the projected blade surface area perpendicular to the flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If four blades are arranged at equal angles around a tubular port, then the sensor structure is simple and easy to manufacture, but the pressure loss varies and temperature detection accuracy is reduced due to blade orientation relative to flow direction
Solution Approach 1:
The patent changes from symmetric blade arrangement (four blades at equal angles) to asymmetric arrangement where blades have different angles relative to the flow direction. Specifically, at least one blade has an acute angle with the flow direction, creating an asymmetric configuration that optimizes medium drawing while maintaining manufacturing simplicity.
Solution Approach 2:
The patent modifies the blade angle parameters relative to the flow direction. Instead of all blades having equal angles (90 degrees apart), the blades are configured with different angles, where at least one blade forms an acute angle with the flow direction. This parameter change optimizes the medium drawing effect and reduces pressure loss.
2Stability of the object's composition
If blades are arranged with equal angles, then the structural symmetry is maintained, but pressure loss increases and medium flow efficiency decreases due to varying orientation relative to flow direction
Solution Approach 1:
The patent introduces asymmetry in blade arrangement by configuring blades with different angles relative to the flow direction. At least one blade forms an acute angle with the flow direction, breaking the symmetric pattern. This asymmetric arrangement optimizes medium drawing efficiency and reduces pressure loss while maintaining structural stability.
3Device complexity
If the number of blades is reduced to four, then the device complexity is lowered, but the consistent drawing of measuring medium becomes difficult leading to varied pressure loss
Solution Approach 1:
The patent optimizes the blade angle parameters to ensure consistent medium drawing with only four blades. By configuring at least one blade at an acute angle to the flow direction and setting specific angle relationships between adjacent blades, the system achieves reliable and consistent medium drawing performance despite the reduced number of blades.
Data Source
AI summary
In a pressure/temperature sensor, a sensor circuit is held by a holding member inside a tube that is fixed to a pipe, and an introduction portion is provided in the holding member at an inner side of the pipe with respect to the sensor circuit. The introduction portion includes a plurality of blades having blade surfaces extending along a protrusion direction of the introduction portion with respect to the sensor circuit. The plurality of blades are arranged radially on a surface perpendicular to the protrusion direction, and angles defined by the blade surfaces of the adjacent blades are all acute angles. Thus, regardless of the angle at which the blade is attached with respect to the flow direction of the measuring medium, an acute-angled portion of any adjacent blades is directed to the flow direction of the measuring medium. Therefore, a pressure loss of the measuring medium can be reduced.