Solar-Powered U-Shape Load Cell for Polished Rod Monitoring
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Solution Overview
Problem
Existing rod pumping systems face challenges in accurately measuring the load on polished rods due to complex and costly installation processes, requiring multiple load cells that are prone to maintenance issues and indirect, inaccurate measurements.
Innovation Solution
A single load cell with a u-shaped structure is positioned between the rod clamp and clamping bar, featuring internal processing and wireless transmission capabilities, powered by a solar battery, allowing direct measurement of combined upward and downward forces without encircling the polished rod, thus simplifying installation and enhancing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple load cells are stacked to measure upward and downward forces, then measurement capability is improved, but device complexity and installation complexity increase
Solution Approach 1:
The patent combines multiple load measurement functions into a single load cell device. The unified load cell integrates both upward and downward force measurement capabilities, eliminating the need for separate stacked load cells while maintaining comprehensive load monitoring functionality.
Solution Approach 2:
The single load cell is designed to perform multiple functions: measuring both upward and downward forces on the polished rod, providing power through integrated solar battery, processing signals internally, and wireless transmission. This multi-functional design replaces the need for multiple specialized components.
2Measurement precision
If load cells encircle the polished rod in a ring shape, then measurement accuracy is improved, but installation time and maintenance complexity increase
Solution Approach 1:
The load cell adopts a segmented structural design with an open framework rather than a complete ring enclosure. This segmentation allows the device to be installed by simply placing it around the polished rod without requiring complex assembly or disassembly operations, significantly reducing installation and maintenance time while preserving measurement accuracy.
3Adaptability or versatility
If load cells are separated from power and transmission devices, then modularity is improved, but overall system complexity and cost increase
Solution Approach 1:
The patent integrates power generation (solar battery), signal processing, and wireless transmission functions directly into the load cell housing. This consolidation creates a self-contained unit that eliminates the need for external wiring and separate components, reducing overall system complexity while maintaining adaptability through integrated functionality.
4Reliability
If external power sources are used for load cells, then power supply reliability is improved, but installation complexity and vulnerability to outdoor elements increase
Solution Approach 1:
The load cell incorporates an integrated solar battery system that generates and stores its own power independently. This self-service power supply eliminates the need for external wiring, batteries, or power sources, making the device self-sufficient and reducing installation complexity while maintaining reliable operation in outdoor environments.
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 provides accurate, direct measurement of load forces on polished rods, reduces maintenance complexity, and lowers costs by eliminating the need for multiple load cells and external power sources, while being resistant to outdoor elements.
Implementation Method 1
a solar panel that is mounted externally on the outer shell of the load cell; a battery that is internal to the outer shell of the load cell; a charger that is internal to the outer shell of the load cell and that is electrically connected to the solar panel and the battery, wherein the charger is configured to receive current from the solar panel and to charge the battery
Data Source
AI summary
A load cell for transmitting load data of a polished rod in a rod pump system includes an outer shell having a u-shaped structure with two protrusions, the u-shaped structure configured to receive the polished rod, and the outer shell configured to be positioned between a rod clamp and a clamping bar of the rod pump system. Internal to the outer shell is a load sensor, a load signal processor, a modulator, a battery, and a charger, whereby the load cell measures a load on the polished rod and wirelessly transmits load signal data via a wireless transmitter internal to the outer shell but with an antenna that protrudes from the outer shell. Also internal to the outer shell is a battery which is charged by an external solar panel via the charger. The battery, charger, and solar panel provide power to the load cell.