Pool Drain Vacuum Sensor and Vent Valve Control
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Solution Overview
Problem
Existing drain safety protection devices for fluid-containing vessels like pools and spas are not effective for various types of installations and can interfere with normal operation, and they do not adequately address safety during pump speed changes or economical operation.
Innovation Solution
A controller system with a vacuum sensor and vent valve that adjusts pump operation based on vacuum levels, using a pressure storage device to inject pressurized fluid and prevent suction-related injuries, while allowing for timed operation and speed control of pumps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If prior art drain safety devices reduce vacuum by turning pump off or opening conduit to atmosphere, then safety is improved, but normal operation of fluid circulation systems is interfered with
Solution Approach 1:
The patent introduces an intermediary mechanism (controlled venting system with solenoid valve) that allows selective release of vacuum without completely shutting down the system. The vent valve acts as a mediator between the vacuum condition and the pump operation, providing a controlled transition state that maintains safety while minimizing interference with normal circulation.
Solution Approach 2:
The system dynamically adjusts the vent valve position based on real-time vacuum sensor feedback. Rather than a static on/off control, the system continuously monitors vacuum levels and adjusts venting accordingly, allowing the circulation system to operate normally under safe conditions while providing rapid safety response when needed.
2Use of energy by moving object
If pump speed is increased for economical operation, then energy efficiency is improved, but safety during speed changes may be compromised
Solution Approach 1:
The patent implements a feedback control system where vacuum sensors continuously monitor suction conditions and provide real-time data to the controller. This feedback loop allows the system to detect unsafe vacuum levels during pump speed changes and automatically adjust operation to maintain safety, enabling economical high-speed operation when safe and preventing unsafe conditions regardless of pump speed.
3Adaptability or versatility
If drain safety protection is made universal for different installations, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent designs a universal control system that can accommodate different drain installation types (above-ground and below-ground pools and spas) through a single multi-functional device. The controller is programmed to recognize and adapt to various installation configurations, and the vent valve system is designed to work with different pump types and arrangements, eliminating the need for installation-specific safety devices.
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 system effectively prevents injuries and damage by dynamically managing vacuum levels, ensuring safety across different drain installations and operational conditions without disrupting normal fluid circulation systems.
Implementation Method 1
a vacuum sensor for sensing a level of vacuum present in the suction conduit and producing a corresponding output
Implementation Method 2
a vent valve in the controller system has at least two positions, a first position which fluidly connects the suction conduit to matter outside the suction conduit and a second position which isolates the suction conduit from matter outside the suction conduit
Implementation Method 3
a pump that moves the fluid from the fluid outlet to the fluid inlet
Data Source
AI summary
A drain protection device and pump controller for pools, spas, fountains and other fluid containment and circulation systems has a vacuum sensor for sensing a level of vacuum present in the suction conduit leading to the pump(s). The vacuum level is monitored by a computer that controls a vent valve that can vent to atmosphere to reduce the vacuum exerted at a drain. In applications with a flooded pump, e.g., above-ground pools, the vent valve may control the discharge of an accumulator that injects fluid pressurized by the return line into the suction conduit to reduce the vacuum therein. The computer also controls the pump(s) present in the circulation system, viz., turns them off to relieve vacuum when a drain is occluded and also runs them at the selected speed based upon a schedule. The vacuum criteria for vacuum reduction may include progressively sensitive values, some of which may be empirically based. Vacuum criteria may be maintained based upon the operational state of the circulation system, e.g., priming, stabilized running or cleaning. Low vacuum limits protect the pump(s) from dry running. A clogged vacuum conduit leading to the vacuum sensor is sensed based upon the presence of vacuum levels that are atypically constant and error processing invoked.