Foldable Flow Straightener Funnel for Accurate Volumetric Airflow Measurement
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Solution Overview
Problem
Volumetric-flow measuring apparatuses experience significant measurement errors due to swirl in air flow, with existing solutions requiring separate assembly of flow straighteners, which complicates handling and increases measurement errors.
Innovation Solution
A foldable flow straightener integrated with the measuring funnel, convertible between transport and use positions, simplifies deployment and assembly by using a deployment device with tensioning rods, ensuring the flow straightener is ready for use without additional assembly steps, and is made from the same material as the funnel for seamless integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a flow straightener is directly disposed on air-guide elements of a supply-air opening, then measurement accuracy is improved by de-swirling the air flow, but device complexity increases due to separate assembly requirements
Solution Approach 1:
The flow straightener is integrated into the measuring funnel as a single unified device. The flow straightener consists of multiple guide elements that are permanently attached to the inner surface of the measuring funnel, eliminating the need for separate assembly steps and reducing device complexity while maintaining measurement accuracy
Solution Approach 2:
The flow straightening function is pre-integrated into the measuring funnel structure during manufacturing. The guide elements are pre-positioned and fixed on the inner surface of the funnel, so that when the funnel is assembled, the flow straightening capability is already in place and ready for immediate use without additional assembly operations
2Measurement precision
If a rigid flow straightener is used to effectively straighten air flow, then measurement accuracy is improved, but weight and space requirements increase
Solution Approach 1:
The measuring funnel is constructed from a foldable, flexible material that can be collapsed into a compact transport position and deployed into a functional measuring position. This flexible construction significantly reduces the weight and space requirements compared to rigid structures, while still providing sufficient structural integrity to support the flow straightening function
Solution Approach 2:
The measuring funnel and flow straightener are designed as a deployable system that transitions between a compact transport state and an expanded measuring state. This dynamic design allows the apparatus to have minimal weight and space requirements during transport, while providing the necessary structural form factor when deployed for measurement
3Ease of operation
If the measuring funnel is made foldable for easy transport, then ease of operation is improved, but measurement precision may deteriorate due to potential misalignment
Solution Approach 1:
The flow straightener is permanently integrated into the measuring funnel structure, ensuring that the guide elements maintain their precise geometric relationships to the funnel opening. This integration ensures that when the funnel is deployed, the flow straightening function is automatically and precisely aligned, eliminating misalignment errors that could affect measurement accuracy
Solution Approach 2:
The flow straightening geometry is pre-established during manufacturing with precise positioning of the guide elements relative to the funnel opening. This preliminary precision work ensures that when the foldable funnel is deployed in the field, the flow straightening function is automatically aligned correctly without requiring additional field calibration or adjustment
Data Source
AI summary
A volumetric-flow measuring apparatus (1) is provided using a measuring funnel (4) and a flow straightener (6) from a foldable material, which is disposed in the measuring funnel (4), configured such that the measuring funnel (4) and the flow straightener (6) are convertible between a folded-up transport position and an unfolded use position.