Flowmeter-to-PCB Assembly for Protected Sensor Mounting
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Solution Overview
Problem
Existing flowmeters for beverage preparation machines face challenges in integration with control units, leading to increased manufacturing costs and complexity due to the need for cables and mechanical constraints that can damage sensors, and they often require multiple assembly orientations which result in errors.
Innovation Solution
A flowmeter design that allows direct mounting onto a printed circuit board (PCB) with a connection arrangement external to the sensor, eliminating the need for cables and reducing the risk of sensor damage, featuring a recess for sensor protection and a spacer for proper positioning, and using materials like POM and PBT for low friction and high precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flowmeter is connected to a control unit using cables and mechanical constraints, then the flowmeter can be integrated with the control unit, but the sensor is at risk of damage and manufacturing complexity increases
Solution Approach 1:
The flowmeter is directly mounted onto the PCB, merging the flowmeter housing with the circuit board structure. The sensor is integrated into the PCB itself, eliminating separate cable connections and mechanical mounting brackets, thereby reducing assembly complexity while maintaining sensor protection
Solution Approach 2:
The sensor is extracted from the flowmeter housing and directly integrated into the PCB. This separation allows the sensor to be protected by the PCB structure while the flowmeter housing serves solely for fluid flow measurement, reducing the risk of mechanical damage during assembly
2Strength
If multiple assembly hooks are used to secure imperviousness, then the flowmeter can withstand higher pressure, but the number of assembly positions increases leading to more errors
Solution Approach 1:
The flowmeter housing features an asymmetric single assembly hook design that provides sufficient pressure resistance. The asymmetric shape ensures correct orientation during assembly, eliminating the problem of multiple valid assembly positions that lead to errors, while maintaining structural strength through optimized hook geometry
3Productivity
If the flowmeter is rigidly fixed onto the PCB, then automatic assembly is facilitated, but the sensor may be damaged by mechanical constraints
Solution Approach 1:
The mounting structure is segmented into distinct functional zones: the flowmeter housing is rigidly fixed to the PCB for automatic assembly, while the sensor area is separated and protected by a recess in the PCB. This segmentation allows rigid fixation for automation while protecting the sensor from mechanical damage
Solution Approach 2:
A recess is provided in the PCB at the sensor location before the flowmeter is mounted. This recess acts as a cushioning feature that prevents the sensor from being subjected to excessive mechanical stress during rigid fixation, thereby protecting sensor integrity while enabling automatic assembly
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 simplifies manufacturing and assembly, reduces costs, and enhances the accuracy and reliability of flow measurement by eliminating cable connections and mechanical stress on sensors, while ensuring proper orientation and protection of the sensor during assembly.
Implementation Method 1
a sensor (51) that is located at the outermost face and that is configured to sense said signal from the generator upon connection
Data Source
AI summary
A flowmeter (1) comprises: an outermost casing (2,4) containing a measuring chamber (10); an outermost face (20) on the casing; a generator (3,36) for generating at the outermost face a signal representative of a flow through the measuring chamber; and a connection arrangement (28) for fastening the outermost casing against a PCB (50) which extends over and beyond the outermost casing and contains a sensor (51) that is located at the outermost face and that is configured to sense the signal from the generator upon connection. The connection arrangement is configured for connection against the PCB, which connection between the PCB and the casing is distinct from the sensor.