Pump Control Unit Liquid Level Detection via Pressure Sensor
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Solution Overview
Problem
Conventional drainage pumps face issues with accurate liquid level detection in environments with changing air pressure and solid matter, leading to inefficient operation and potential damage due to reliance on external sensors and constant operation modes.
Innovation Solution
An integrated pressure sensor with a fixed reference is used within the pump, connected to a control unit that calibrates and determines liquid levels by relating actual pressure values to a reference, allowing for accurate liquid level monitoring and reducing the impact of changing air pressure, while protecting the sensor from external damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If external discrete level sensors are used to detect liquid level, then the pump can be controlled to start and stop based on liquid level, but the sensors become prevented from floating freely due to solid matter in the liquid and cannot detect the liquid level correctly
Solution Approach 1:
The patent replaces mechanical floating level sensors with a pressure sensor that measures liquid level through pressure detection. The pressure sensor is connected to the pump housing and measures the pressure exerted by the liquid column, converting a mechanical floating mechanism into a pressure-based detection system that is not affected by solid matter in the liquid.
2Reliability
If the pump operates constantly to maintain dry environment, then the liquid level can be kept low, but the pump damages itself and consumes excessive energy when there is no or little water available
Solution Approach 1:
The patent implements a feedback control system where the pressure sensor continuously monitors the liquid level and provides information to the control unit. The control unit adjusts the pump operation based on the actual liquid level, creating a closed-loop system that prevents unnecessary operation and reduces energy consumption while maintaining reliable liquid level control.
3Use of energy by moving object
If the pump is stopped when liquid level is low to save energy, then energy consumption decreases, but the pump may start boiling mode and damage seals when operated without sufficient water
Solution Approach 1:
The patent uses the pressure sensor to detect liquid level conditions in advance before the pump starts operating. The control unit receives advance warning of low liquid levels and can prevent pump startup or shut down the pump before boiling conditions occur, protecting the seals from damage while avoiding unnecessary energy consumption.
4Measurement precision
If integrated pressure sensor with fixed reference is used within the pump, then accurate liquid level determination is achieved independent of changing air pressure, but the device complexity increases
Solution Approach 1:
The patent merges the pressure sensor, reference pressure chamber, and control unit into an integrated system within the pump housing. The fixed reference pressure is established using the pump's own structure (such as the inlet chamber or a sealed cavity), combining multiple functions into a unified system that achieves accurate measurement without adding significant external components.
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 enables precise liquid level determination and adaptive pump operation, reducing energy consumption and wear by eliminating the need for external sensors and protecting the pressure sensor from harsh environments.
Implementation Method 1
an integrated pressure sensor that has a fixed reference and that is operatively connected to the control unit
Implementation Method 2
determine a liquid level of the liquid surrounding the pump based on a relation between an actual value of the pressure sensor and a reference value
Data Source
AI summary
A pump having a drive unit with an electric motor, a hydraulic unit connected to the electric motor, and an integrated control unit operatively connected to the electric motor and configured for monitoring and controlling the pump. An integrated pressure sensor, connected to the control unit, has a fixed reference pressure. The control unit determines a liquid level of a liquid surrounding the pump based on a relation between an actual value of the pressure sensor and a reference value. A method for calibrating the pump comprises initiating pumping, continuing pumping until the liquid level is equal to a predetermined calibration level, determining the actual pressure value when the liquid level is equal to the predetermined calibration level, and calibrating the pump by setting a new reference pressure value corresponding to the actual pressure value.