Submersible Centrifugal Pump Startup Using Torque-Speed Ramp Switching
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Solution Overview
Problem
Existing methods for starting submersible centrifugal pumps result in either slow startup, leading to inefficiency, or rapid startup that causes turbidity and cloudiness in the pumped fluid, failing to provide a balance between speed and clarity.
Innovation Solution
An electric drive apparatus is used to control the motor of the submersible centrifugal pump, implementing an accelerating ramp followed by an operational pumping ramp, where torque versus speed is monitored to detect a significant increase indicating operational pumping conditions, allowing for a fast and secure startup with reduced turbidity and cloudiness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a slow start of the submersible centrifugal pump is used, then turbidity and cloudiness in the borehole fluid is reduced, but the pumping startup time becomes too long and efficiency is reduced
Solution Approach 1:
The patent applies dynamics by implementing a two-stage accelerating ramp system where the pump motor speed is first increased along an initial accelerating ramp, then detected to transition to a second accelerating ramp. This dynamic adjustment of acceleration profiles allows the system to achieve fast startup while minimizing fluid disturbance and turbidity, resolving the contradiction between startup speed and fluid clarity.
Solution Approach 2:
The patent employs feedback mechanisms by detecting the first accelerating ramp execution and using this information to trigger the second accelerating ramp. The system monitors pump motor speed and acceleration patterns, adjusting the ramp profile based on real-time conditions to optimize both startup speed and minimize turbidity generation.
2Productivity
If a fast start of the submersible centrifugal pump is used, then pumping startup time is reduced and efficiency is improved, but turbidity and cloudiness in the borehole fluid increases
Solution Approach 1:
The patent segments the acceleration process into two distinct phases: a first accelerating ramp and a second accelerating ramp. This segmentation allows the system to optimize each phase differently - the first ramp prepares the system while the second ramp delivers the high-speed startup needed for efficiency, collectively achieving fast startup with minimized fluid disturbance.
Solution Approach 2:
The patent changes acceleration parameters by transitioning from the first accelerating ramp profile to the second accelerating ramp profile. This parameter change allows the system to adjust acceleration characteristics dynamically, achieving high startup speed while controlling fluid disturbance and turbidity generation.
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 a fast and secure startup of submersible centrifugal pumps while minimizing turbidity and cloudiness in the pumped fluid, providing an efficient and effective method for operational pumping.
Implementation Method 1
the torque of the motor of said submersible centrifugal pump versus pump motor speed is monitored in said electric drive apparatus
Implementation Method 2
submersible centrifugal pumps are widely used in pumping plants and installations for pumping fluid from large depths
Data Source
AI summary
A field of controlling pumps and pumping plants and installations, such as electrical devices and installations used for controlling pumps and pumping plants and installations, and more particularly to a method and an arrangement for starting pumping with a submersible centrifugal pump for pumping fluid. In the arrangement for starting pumping with a submersible centrifugal pump for pumping fluid, the arrangement including a submersible centrifugal pump and an electric drive apparatus arranged for controlling the motor of the submersible centrifugal pump, the electric drive apparatus is arranged: for starting an accelerating ramp for ramping up the speed of the motor of the submersible centrifugal pump; for monitoring the torque of the motor of the submersible centrifugal pump versus pump motor speed; and upon detecting a significant increase in the derivate of monitored torque versus pump motor speed, for starting an operational pumping ramp for the motor of the submersible centrifugal pump.