Variable Speed Pump Control for Deadhead and Entrapment Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional aquatic pumps operate at fixed speed settings, making them non-responsive to changes in aquatic application conditions and user safety risks due to deadhead and entrapment hazards, such as sediment buildup and suction entrapment of users.
Innovation Solution
A variable speed pumping system with sensors to detect blockages and performance changes, allowing for real-time adjustments to prevent damage and injury by altering pump operation based on determined blockages and performance thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a pump operates at fixed speed settings, then the pump structure is simple and reliable, but the pump cannot respond to changes in aquatic application conditions and safety risks
Solution Approach 1:
The patent implements variable speed control of the pump motor, transitioning from fixed speed settings to dynamically adjustable speed. The controller modifies motor operating parameters in real-time based on sensor feedback, enabling the pump to adapt to changing aquatic application conditions and safety requirements.
Solution Approach 2:
The patent incorporates sensors that monitor pump operating conditions and provide feedback to the controller. The controller compares sensor values against stored thresholds and adjusts motor parameters accordingly, creating a closed-loop control system that responds to actual pump performance and safety conditions.
2Reliability
If the pump operates without supervision, then the operation is simple, but deadhead and entrapment conditions can cause damage or injury
Solution Approach 1:
The patent uses sensors to continuously monitor pump operating parameters and provides feedback to the controller. The controller compares sensor readings against predetermined thresholds and activates alarm conditions or shuts down the pump when unsafe conditions are detected, providing supervised operation without requiring complex manual intervention.
Solution Approach 2:
The pump system performs self-monitoring and self-protection through automated sensor-based detection and controller responses. The system automatically detects deadhead and entrapment conditions and takes corrective action without requiring external supervision, reducing the need for manual oversight while improving safety.
3Adaptability or versatility
If the pump speed is continuously variable, then the pump can respond to changing conditions, but the control system becomes more complex
Solution Approach 1:
The patent modifies motor operating parameters, specifically speed and torque, based on sensor feedback and predetermined thresholds. The controller adjusts these parameters dynamically to optimize pump performance and ensure safety, enabling continuous speed variation without requiring overly complex control mechanisms.
Data Source
AI summary
Embodiments of the invention provide a system including a pump, a motor, and a controller. The controller establishes a baseline value of power consumption during a deadhead condition, increases a counter when a current value decreases below the baseline value, and determines a deadhead condition when the counter exceeds a limit. The controller also compares a current value to an immediately previous power consumption value to determine an entrapment condition indicated by a sudden decrease in power consumption.