Insert-Plate Flowmeter Channels for Stable Laminar Bypass Flow
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Solution Overview
Problem
Existing flow rate measuring units face challenges in achieving laminar flow in both measuring and bypass channels due to turbulent flow effects, and the geometry of the measurement channel branch is fixed, making it difficult to vary or optimize.
Innovation Solution
The design includes a stack of insert plates with plate openings and recesses that form defined flow channels, ensuring a sealing arrangement that prevents parasitic ducts and allows for a controlled flow path, with optional sealing elements and flexible routing of electrical connections to maintain laminar flow and prevent turbulence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single bypass channel is used, then the device complexity is reduced, but turbulent flow effects occur that negatively affect laminar flow in the measuring channel
Solution Approach 1:
The bypass channel is divided into multiple parallel bypass channel branches (at least two) with identical or similar cross-sectional shapes to the measuring channel branch. This segmentation distributes the flow and prevents turbulent flow effects that would occur in a single large bypass channel, thereby maintaining laminar flow stability in the measuring channel while managing device complexity through standardized components.
Solution Approach 2:
The insert plates are nested within the channel expansion chamber, with each plate contributing to form the bypass channel branches and measuring channel branch. The plates are arranged in a stacked configuration where they collectively define the flow paths, allowing for compact integration of multiple channels within a confined space while maintaining precise geometric control for laminar flow.
2Manufacturing precision
If the measuring channel branch geometry is fixed, then the manufacturing precision is improved, but the adaptability to optimize flow capacity and measurement accuracy is reduced
Solution Approach 1:
The measuring channel branch geometry is made adjustable through the use of replaceable insert plates. Different insert plates with varying geometries (different numbers, positions, and dimensions of plate recesses) can be inserted into the channel expansion chamber to modify the bypass channel branches configuration. This allows optimization of flow capacity and measurement accuracy for different applications while maintaining precise manufacturing of each individual plate component.
Solution Approach 2:
The insert plate stack system serves multiple functions: it defines the measuring channel branch geometry, creates multiple bypass channel branches, provides sealing surfaces, and enables geometric variation for different measurement requirements. This universal design allows a single base structure to accommodate various measurement needs by simply changing the insert plates, thereby achieving adaptability without sacrificing manufacturing precision of the core components.
3Reliability
If insert plates are pressed against each other for sealing, then the reliability of flow path definition is improved, but the device complexity increases due to additional sealing mechanisms
Solution Approach 1:
The sealing function is merged with the structural function of the insert plates themselves. The plates are pressed against each other and against the channel expansion chamber walls to create both the flow path definition and the sealing simultaneously. This eliminates the need for separate sealing components in many locations, as the plates' own surfaces and the pressing mechanism serve dual purposes of defining and sealing the flow paths.
Solution Approach 2:
The insert plates self-seal through their own arrangement and the pressing force applied to the stack. The plates' geometry and positioning allow them to create sealing surfaces against each other and the chamber walls without requiring external sealing components. The system uses its own structural elements to achieve sealing, reducing overall device complexity while maintaining reliable flow path definition.
Data Source
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AI summary
Flow rate measuring unit (1) with a housing (2) consisting of at least two housing parts (3, 4) that can be connected to one another, in which a flow channel (9) extends, which branches into a measuring channel branch (38) and at least one bypass channel branch (36), a substrate (11) with a sensor arrangement being arranged in the measuring channel branch (38). According to the invention, the flow channel (9) has a channel expansion chamber (12) in which a stack of insert plates (15) made up of at least two insert plates (16) is arranged, each of which has at least one longitudinal plate recess (17, 17') as a measuring channel branch (38). and/or as a bypass channel branch (36). The insert plates (16) are provided as inserts for the channel expansion chamber (12).