Self-Regulating Valve Decoupling Flow Rate and Activation Pressure
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Solution Overview
Problem
Drip irrigation systems face challenges in achieving large-scale dissemination due to the high cost of pumps and power systems, primarily because power consumption is proportional to the product of flow rate and pressure, with existing technologies failing to efficiently control flow rate and activation pressure independently.
Innovation Solution
A self-regulating valve design featuring a static pressure chamber with an elastically collapsible tube and a needle valve flow restrictor, allowing for constant flow rate maintenance despite varying pressures, by decoupling activation pressure and flow rate control through the use of a needle valve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pressure control methods are used to maintain constant flow rate, then flow rate stability is improved, but activation pressure increases and power consumption rises
Solution Approach 1:
The valve uses the incoming pressurized liquid itself to control the flow rate through the flow restrictor, eliminating the need for external power sources or complex control systems. The liquid's own pressure drives the mechanism that regulates its flow, achieving self-regulation without additional energy input.
Solution Approach 2:
The invention changes the flow rate parameter independently from pressure by introducing a flow restrictor that creates a pressure drop. This decouples the relationship between activation pressure and flow rate, allowing constant flow rate maintenance at lower activation pressures compared to conventional methods.
2Use of energy by moving object
If pump pressure is reduced to lower power consumption, then energy efficiency is improved, but flow rate control precision deteriorates
Solution Approach 1:
The flow restrictor acts as an intermediary element between the pressurized liquid source and the output. It creates a controlled pressure drop and regulates flow rate independently of the source pressure variations, maintaining precision even when pump pressure is reduced for energy efficiency.
Solution Approach 2:
The valve segments the pressure control and flow rate control functions into separate components: the static pressure chamber handles pressure stabilization while the flow restrictor handles flow rate precision. This segmentation allows each component to optimize its function independently, maintaining precision at lower pressures.
3Power
If activation pressure is lowered to reduce pumping power, then power system cost is reduced, but flow rate constancy under pressure variation deteriorates
Solution Approach 1:
The valve incorporates inherent feedback through the flow restrictor and collapsible tube mechanism. When pressure varies, the system automatically adjusts the flow restrictor opening to maintain constant flow rate, creating a self-correcting feedback loop that ensures reliability at low activation pressures.
Solution Approach 2:
The invention changes the flow characteristics through the restrictor to create a relationship where flow rate becomes independent of pressure variations. By controlling the restrictor geometry and position, the system maintains constant flow rate parameter even when activation pressure is lowered to reduce pumping power.
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 design achieves a low activation pressure, reducing pumping power and enabling efficient flow rate control independently of pressure variations, thereby lowering energy consumption and enhancing the scalability of drip irrigation systems.
Implementation Method 1
an elastically collapsible tube supported within the static pressure chamber
Implementation Method 2
the flow restrictor is a needle valve
Data Source
AI summary
A passive, self-regulating valve includes a static pressure chamber and an elastically collapsible tube supported within the static pressure chamber. The elastically collapsible tube is defined by a geometry that determines an activation pressure of the valve. The passive, self-regulating valve also includes a flow restrictor in fluid communication with the elastically collapsible tube inside the static pressure chamber, as well as piping connecting a source of pressurized liquid both to the flow restrictor and to an opening into the static pressure chamber. The piping enables the flow restrictor to control flow rate of the pressurized liquid through the valve independent of the activation pressure of the valve. In a preferred embodiment, the flow restrictor is a needle valve.