Flowmeter Design for Liquid Measurement Accuracy
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Solution Overview
Problem
Existing flow meters for small liquid amounts face challenges in achieving high measuring accuracy due to air pockets from flow interruptions and are often bulky, costly, and difficult to produce with precise dimensions, especially when using plastic injection molding, which results in burr formation and turbulence at the transition edges.
Innovation Solution
A compact flow meter design featuring a two-part cylindrical measuring housing with a tangentially directed inflow nozzle and a conical bearing pin, incorporating a separate nozzle tube with precise axial positioning to minimize turbulence and air bubble retention, allowing for cost-effective production and improved measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a compact flow meter design is used, then the device size is reduced, but manufacturing precision deteriorates due to burr formation at transition edges during plastic injection molding
Solution Approach 1:
The flow meter housing is divided into two separate parts: the measuring housing and the inflow connection piece. This segmentation allows each component to be manufactured independently with optimized molding processes, avoiding the burr formation issue that occurs when trying to produce a compact integrated housing with tight transition edges.
Solution Approach 2:
An intermediary connection structure is introduced between the measuring housing and inflow connection piece. This intermediary design provides a dedicated connection interface that accommodates the transition from inflow to cyclonic flow without creating problematic sharp edges, thus maintaining manufacturing precision while achieving compact dimensions.
2Ease of manufacture
If plastic injection molding is used for cost-effective production, then manufacturing cost is reduced, but measurement precision deteriorates due to turbulence and air bubble retention at transition edges
Solution Approach 1:
By segmenting the housing into separate injection-molded parts, the design maintains cost-effectiveness while eliminating the turbulence-causing transition edges. Each part can be optimized for its specific function, with the connection interface designed to minimize flow disturbances.
Solution Approach 2:
The design accepts the limitations of plastic injection molding (such as draft angles and parting lines) and incorporates them into the design in a way that actually benefits flow characteristics. The connection interface is designed to accommodate molding constraints while promoting smooth flow transition and reducing air bubble retention.
3Device complexity
If a compact design with integrated components is used, then device complexity is reduced, but adaptability deteriorates for different applications
Solution Approach 1:
The segmented housing design allows the measuring housing to remain a standardized, simple component while the inflow connection piece can be varied to suit different applications. This segmentation maintains low overall complexity while providing high adaptability through modular connection designs.
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 design ensures high measuring accuracy even with air pockets, is cost-effective to produce, and adaptable to various applications with precise flow path definition, reducing turbulence and air bubble issues at transition edges.
Implementation Method 1
a secondary housing (14) is provided on the housing cover (8) for a sensor which, e.g. due to the Hall effect, responds to at least one sensor transmitter provided on the impeller
Implementation Method 2
the outflow connector (7) is centrally formed on a housing cover (8) closing the cup-shaped housing part (3), so that it can drain off the liquid flowing in tangentially in a cyclone-like manner
Data Source
Figure 1~2
Figure 3~4
AI summary
The flow meter has an inlet flow port (4) tangentially formed at a cylindrical measuring housing in plastic injection molding. A sensor is provided at the housing for determining fluid amount flowing through the housing based on rotation of a wheel blower. An outlet flow port is centrally formed at a housing cover, and the inlet flow port encloses a nozzle tube (18) forming a nozzle channel so that a fluid flows through the flow meter in a cyclonic manner, where the tube is inserted into the inlet flow port and opens corresponding to a direction of the inlet flow port.