Garden Pump Flow Sensor Delay Control
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Solution Overview
Problem
Garden pumps face issues with overheating and damage due to prolonged operation without water flow, particularly in mobile designs where conventional flow and pressure sensors lead to frequent and unintended switching on and off, causing electrical stress and increased costs.
Innovation Solution
A garden pump arrangement utilizing a flow sensor with a significantly increased delay time of at least 1.5 minutes for shutdown, eliminating the need for a pressure sensor, and incorporating a remote control module for manual restart, along with a status display to indicate operational and fault states, ensuring safe operation and reducing complexity and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flow sensor with short delay time (10-20 seconds) is used for automatic pump shutdown, then the pump is protected against overheating, but the pump switches off and on frequently during user pauses, causing electrical stress and damage
Solution Approach 1:
The patent changes the delay time parameter from conventional 10-20 seconds to at least 1.5 minutes (preferably 2-5 minutes). This parameter change allows the pump to remain running during typical user pauses while still shutting off after genuine non-use periods, thereby protecting against overheating without causing frequent unwanted switching that would create electrical stress.
2Ease of operation
If a pressure sensor is added to monitor lower pressure threshold for automatic restart, then the pump can automatically restart after pauses, but the system becomes more complex and costly
Solution Approach 1:
The patent extracts and removes the pressure sensor component from the system. Instead of using a pressure sensor to detect when to restart the pump, the system relies on the user to manually restart the pump after a pause period. This elimination of the pressure sensor simplifies the system architecture, reduces component count, and lowers overall system cost while still providing adequate functionality.
3Device complexity
If flow detection is not installed in mobile garden pumps, then the system remains simple and affordable, but the pump cannot detect dry running conditions and may overheat
Solution Approach 1:
The patent implements a self-service approach where the user monitors the pump operation and manually intervenes by switching off the pump if no water flow is observed. This eliminates the need for complex automatic flow detection systems while still providing protection against dry running damage, maintaining system simplicity and affordability while ensuring user awareness of pump status.
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 effectively prevents overheating and damage by ensuring the pump remains off during extended pauses, reducing electrical stress and costs, while maintaining user convenience with a simpler and more reliable control system.
Implementation Method 1
a flow sensor determines when a flow rate through the pump outlet falls below a minimum flow rate
Data Source
Figure 1~3
AI summary
For a garden pump that is automatically switched off by means of a flow sensor that detects a minimum flow rate, a delay time between the time at which the flow rate falls below the minimum flow rate and the time at which the drive motor is switched off is set to at least 1.5 minutes, and after the drive motor has been switched off due to the flow rate falling below the minimum flow rate, the drive motor can be switched back on regardless of pressure by means of a control element to be operated by the user. Thus, the control device is made considerably simpler and cheaper compared to known embodiments that automatically switch back on when the pressure falls below a lower pressure threshold, and the loading of the electrical part of the pump is reduced and the service life of said electrical part is increased.