Thermal Mass Flow Meter Control for Bubble-Aware Fluid Dosing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current flow control systems for fluids, particularly in applications like beverage dispensers, face challenges in accurately controlling flow rates and detecting changes in fluid phase, such as the presence of bubbles, which can lead to inefficiencies and maintenance issues.
Innovation Solution
A flow control module incorporating a thermal mass flow meter and dual solenoid assemblies, where the thermal mass flow meter communicates signals based on flow rate and temperature, allowing for proportional control and detecting phase changes, and a controller adjusts operations based on these signals to maintain optimal flow and detect anomalies like bubbles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a thermal mass flow meter is used to measure flow rate and detect phase changes, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent combines the flow rate measurement and temperature detection functions into a single thermal mass flow meter component. The heater element and temperature sensors are integrated within the same housing, allowing simultaneous measurement of flow rate and fluid temperature without requiring separate measurement devices, thus improving measurement precision while limiting the increase in device complexity.
Solution Approach 2:
The thermal mass flow meter serves multiple functions: it measures flow rate by detecting heat transfer from the heater to the fluid, detects phase changes (such as bubble presence) through temperature sensor readings, and provides temperature compensation data. This multi-functionality improves measurement precision across different parameters while avoiding the need for multiple separate measurement devices.
2Manufacturing precision
If dual solenoid assemblies are used for flow control, then flow control precision is improved, but device complexity increases
Solution Approach 1:
The flow control function is divided into two separate solenoid assemblies: a first solenoid assembly for on/off control and a second solenoid assembly for proportional control. This segmentation allows each solenoid to be optimized for its specific control mode, improving overall flow control precision while keeping the complexity manageable through functional division.
Solution Approach 2:
The system transitions from static on/off control to dynamic proportional control by incorporating a second solenoid assembly that can modulate flow continuously. This dynamic control capability improves flow control precision by allowing real-time adjustment of flow rates based on actual system needs, while the modular solenoid design keeps the added complexity manageable.
3Reliability
If real-time flow and temperature monitoring is implemented, then reliability is improved, but use of energy increases
Solution Approach 1:
The thermal mass flow meter continuously monitors flow rate and temperature without interruption, providing real-time data for reliability improvements. The heater and temperature sensors operate continuously to detect flow conditions and phase changes, ensuring that the system can respond immediately to any anomalies, thereby maintaining high system reliability.
Solution Approach 2:
The system implements feedback control by using the flow rate and temperature data from the thermal mass flow meter to adjust solenoid assembly operations. The controller receives continuous feedback signals and adjusts the solenoids to maintain optimal flow conditions, improving reliability through closed-loop control while managing energy consumption through intelligent control algorithms.
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 system ensures precise control of fluid flow rates and detects phase changes, preventing inefficiencies and maintenance issues by adjusting solenoid operations based on real-time flow and temperature data, thereby improving system performance and reliability.
Implementation Method 1
The thermal mass flow meter is configured to generate the first signal based on a measured amount of heat transferred from the heater to the temperature sensor
Implementation Method 2
The temperature sensor comprises a thermocouple, a thermopile, or thermistor
Data Source
AI summary
A flow control module with a thermal mass flow meter is provided. The thermal mass flow meter facilitates measuring both a flow rate and a temperature of a fluid passing through the flow control module. Fluids may experience different flow characteristics at different temperature ranges. The flow control module includes a proportional control valve for selectively adjusting the flow rate of the fluid passing through the flow control module. Upon detecting that the temperature of the fluid is outside of a temperature range for the fluid, a controller is configured to load a different set of calibration parameters for controlling the operation of the proportional control valve to accommodate the different flow characteristics of the fluid at that temperature. Additionally, the controller is configured to detect bubbles using the thermal mass flow meter based upon the difference in thermal conductivity of gasses and liquids.