Dynamic Balance Weight Control for Deep-Well Pump Reliability
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Solution Overview
Problem
Deep-well pumps with electric drives face reduced service life due to frequent mode changes between motor and generator operations, leading to tooth flank wear and environmental concerns from generator operation.
Innovation Solution
A delivery device with a connecting rod and balance weights, controlled by a computer, which prevents generator operation by displacing balance weights and adjusting the pivot bearing, allowing for continuous motor operation and variable output, and utilizes contactless energy supply to maintain efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the drive operates in generator mode during viscosity changes, then energy can be recovered, but tooth flank wear increases and service life decreases
Solution Approach 1:
The patent applies dynamics by making the balance weights movable rather than fixed. The control system dynamically adjusts the position of balance weights in real-time based on operating conditions to prevent generator mode operation. This dynamic adjustment allows the system to adapt to changing loads and viscosity conditions, maintaining motor mode operation and avoiding tooth flank wear while still managing energy recovery appropriately.
Solution Approach 2:
The patent changes the parameter of balance weight position from fixed to variable. By controlling the angular position of balance weights relative to the crankshaft, the system modifies the inertial characteristics of the drive mechanism. This parameter change enables prevention of negative torque conditions that cause generator mode, thereby protecting the gear unit from wear while managing energy recovery.
2Device complexity
If balance weights are fixed, then the structure is simple, but generator operation occurs during load changes reducing service life
Solution Approach 1:
The patent transforms the static balance weight system into a dynamic one by enabling angular adjustment of balance weights relative to the crankshaft. This dynamic capability allows the system to adapt to varying operating conditions and prevent generator mode operation, significantly improving service life despite the increased structural complexity of adding actuators and control systems.
3Device complexity
If the pivot bearing position is fixed, then the mechanism is simpler, but the lift and output volume cannot be adjusted
Solution Approach 1:
The patent makes the pivot bearing position dynamic by providing actuation capability to adjust the distance between the pivot bearing and the crankshaft center axis. This dynamic adjustment enables variable lift and output volume while maintaining reasonable mechanical simplicity through the use of controlled mechanical adjustments rather than complex variable geometry mechanisms.
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 solution extends the service life of deep-well pumps, reduces environmental impact by avoiding generator operation, and allows for adjustable output and efficient power utilization by maintaining motor operation and optimizing delivery rates.
Implementation Method 1
balance weights are situated on the part, such that they are able to be displaced by a first drive
Implementation Method 2
the rectifier supplies the generator energy to a brake resistor for conversion into thermal energy
Implementation Method 3
the pivot bearing is situated on the part so as to be displaceable by a second drive, so that the distance between the pivot bearing and the center axis of the shaft is variable
Data Source
AI summary
A delivery device having a connecting rod, and a method for controlling a delivery device having a connecting rod and at least one balance weight, includes a part that is permanently connected to a shaft, on which part a pivot bearing is situated, by which the first end region of the connecting rod is accommodated by the part, in particular such that the connecting rod is able to be driven in eccentric manner, balance weights being situated on the part so as to be displaceable by a first drive, a first computer being provided on the part, which controls the displacement of the balance weights.