Variable-Speed Water Lifting Station Control
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Solution Overview
Problem
Current wastewater or rainwater lifting stations with single-speed electric pumps consume excessive energy due to constant high-speed operation, regardless of varying flow conditions, leading to inefficient energy use and pump wear.
Innovation Solution
A lifting station with a control device that adjusts the operation of the evacuation pump's motor based on historical operating parameter values, such as discharge flow rate, to optimize energy use and prevent unnecessary maximum operation, using a brushless motor and electronic control system to adapt rotational speed and torque, and prevent overflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If single-speed electric pumps operate at maximum capacity, then water evacuation capability is maximized, but energy consumption increases excessively
Solution Approach 1:
The patent applies dynamics by transitioning from fixed single-speed pump operation to variable-speed operation. The control device adjusts the rotational speed of the pump motor dynamically based on historical operating parameters and current water level conditions, allowing the pump to operate at optimal speed rather than constant maximum speed, thereby reducing energy consumption while maintaining adequate evacuation capability.
Solution Approach 2:
The patent changes the operating parameter of the pump from fixed maximum speed to variable speed. By modifying the rotational speed parameter based on historical data and current conditions, the system achieves energy efficiency without sacrificing productivity. The control device adjusts speed parameters to match actual demand, preventing excessive energy use during low-flow conditions.
2Reliability
If pumps operate at maximum capacity continuously, then water evacuation is ensured, but pump aging accelerates
Solution Approach 1:
The system uses dynamic speed adjustment to reduce mechanical stress on the pump. By operating at lower speeds when full capacity is not needed, the pump experiences reduced wear and tear, extending its service life while still ensuring reliable water evacuation when necessary. The historical parameter tracking enables proactive adjustment before excessive wear occurs.
3Use of energy by moving object
If pump speed is reduced to save energy, then energy consumption decreases, but water evacuation efficiency may be compromised
Solution Approach 1:
The patent implements feedback control by continuously monitoring historical operating parameters and using this information to adjust pump speed. The control device learns from past performance and adapts the pump operation to maintain optimal evacuation efficiency while minimizing energy consumption. This closed-loop approach ensures that speed reductions do not compromise evacuation effectiveness.
Solution Approach 2:
The system performs preliminary analysis of historical operating parameters before adjusting pump speed. By pre-processing data from previous cycles and predicting optimal operating conditions, the control device can proactively adjust speed to achieve energy savings without risking evacuation efficiency. This anticipatory adjustment prevents both over-pumping and under-pumping scenarios.
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 reduces energy consumption by matching pump operation to actual flow requirements, delaying pump aging, and preventing overflow, while maintaining efficient water evacuation.
Implementation Method 1
the motor of the evacuation pump is an electric motor, in particular a brushless motor
Data Source
Figure 1~2a
Figure 2b
Figure 2c~2d
AI summary
Pumping station (10) for the evacuation of water, said station comprising: - a tank (12) intended to receive water to be evacuated, - at least one water evacuation pump (16) equipped with a motor (30), and - a control device (20) for the motor (30) of the evacuation pump (16) on a given pumping cycle as a function of at least one value of an operating parameter of the pump at a past pumping cycle, referred to as the "historical value".