Multi-Point Head Loss Flow Measurement Device
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Solution Overview
Problem
Existing flow measurement devices for open channels in large-scale irrigation areas suffer from low precision, high cost, and inefficiency, making it challenging to accurately measure flow velocity and rate.
Innovation Solution
A high precision channel flow measurement device and method based on the principle of multi-point head loss, utilizing telescopic guide rods, Pitot tubes, ultrasonic probes, and a Micro Controller Unit (MCU) for precise measurement of flow velocity and rate across different irrigation channel cross sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the traditional flowmeter velocity-area method is used for flow measurement in open channels, then the measurement can be performed, but the measurement precision is low and the workload is large
Solution Approach 1:
The measurement cross-section is divided into multiple segments (first measurement cross-section and second measurement cross-section) with respective measurement points. By segmenting the complex open channel flow into manageable sections, the patent enables precise measurement at each segment while reducing the overall measurement complexity compared to measuring the entire cross-section simultaneously.
Solution Approach 2:
The patent introduces a flow measurement tube as an intermediary element inserted into the channel. This tube contains Pitot tubes and ultrasonic probes that serve as mediators to measure flow velocity and head loss at multiple points. The flow measurement tube simplifies the measurement process by providing a structured framework for collecting data at multiple locations without requiring complex field operations.
2Measurement precision
If a relatively advanced flow measurement device based on traditional principles is adopted, then measurement capability is improved, but the cost increases and measurement precision cannot be ensured
Solution Approach 1:
The patent replaces traditional mechanical flow measurement methods with a combination of ultrasonic probing and electronic data processing. The ultrasonic probes measure flow velocity non-contactingly, and the Micro Controller Unit processes the data to calculate flow rate. This substitution of mechanical measurement systems with ultrasonic and electronic systems achieves high measurement precision while keeping the device cost-effective.
Solution Approach 2:
The patent changes the measurement parameters from single-point velocity measurement to multi-point head loss measurement. By measuring head loss at multiple points along the flow measurement tube and using the Darcy-Weisbach equation to calculate flow velocity from these parameter changes, the system achieves high precision flow rate measurement without requiring expensive traditional flow measurement devices.
3Measurement precision
If single-point measurement is used, then the measurement process is simple, but the measurement accuracy is insufficient for open channel flow
Solution Approach 1:
The patent implements continuous measurement at multiple points along the flow measurement tube. The ultrasonic probes continuously measure flow velocity at each measurement point, and the system continuously calculates the flow rate based on the integrated head loss data. This continuous multi-point measurement approach ensures high accuracy while minimizing the total measurement time compared to repeated single-point measurements.
Solution Approach 2:
The patent performs preliminary setup by installing the flow measurement tube with multiple Pitot tubes and ultrasonic probes at the measurement cross-section before actual measurement begins. This preliminary arrangement of measurement components allows for rapid sequential measurement at different points without requiring repeated deployment and adjustment, thereby reducing total measurement time while maintaining high accuracy.
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 solution enables precise and efficient measurement of flow rates in open channels, improving measurement accuracy and reducing costs, facilitating real-time monitoring and data analysis for effective water resource management.
Implementation Method 1
The flow measurement tube is communicated with two Pitot tubes for measuring heights of water heads
Implementation Method 2
An ultrasonic probe a is arranged at a top of the Pitot tube
Data Source
AI summary
The present disclosure discloses a high precision channel flow measurement device and method based on a principle of multi-point head loss. A flow velocity of a designated position is acquired by using a flow measurement tube; the flow measurement tube is moved in a vertical direction through a convex sliding block and a motion guide pillar to measure the flow velocity at different measurement points on a measurement line; an overall flow measurement part is integrally ascended, that is, the motion guide pillar leaves a water body, in combination with a load bearing telescopic lifting frame; the overall flow measurement part integrally moves left and right in a longitudinal direction through a telescopic guide rod to reach a set position; the overall flow measurement part is integrally descended through the load bearing telescopic lifting frame, that is, the motion guide pillar enters the water body to acquire the flow velocity.