Miniature Thermal Control Valve With Fluted Spool for High Flow
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Solution Overview
Problem
Existing thermal control valves are large, bulky, and have lower flow rate ratings, requiring larger spool travel and not optimized for current temperature control ranges, making them unsuitable for modern applications that demand higher accuracy, increased flow rates, and reduced size and weight.
Innovation Solution
A miniature passive thermal control valve with an adjustable thermal actuator that uses a lever mechanism and fluted spool design to achieve higher flow rates and reduced size, capable of operating as either a mixing or splitting valve, with a thermal actuator that adjusts based on temperature changes to control fluid flow efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If prior thermal control valves used a linear valve approach, then the valve could operate with simple structure, but the spool travel increased the size of the valve
Solution Approach 1:
The patent employs a fluted spool design where the spool rotates rather than translating linearly. The flutes create pressure differentials that drive rotational motion, converting linear thermal actuator movement into rotational valve control. This dynamic approach reduces spool travel distance while maintaining control authority, directly resolving the contradiction between simple structure and reduced size.
Solution Approach 2:
The invention transitions from linear spool movement to rotational spool movement. By changing the dimension of motion from one-dimensional linear translation to one-dimensional rotation, the valve achieves compact size without sacrificing structural simplicity. The fluted spool geometry enables this dimensional transformation while maintaining ease of manufacture.
2Adaptability or versatility
If prior thermal control valves were designed for larger temperature control range, then the valve could operate in broader conditions, but the flow rate rating decreased
Solution Approach 1:
The fluted spool design creates localized pressure differentials at specific flute positions rather than relying on uniform linear movement. This allows the valve to maintain high flow rate capability at the outlet while responding to broader temperature ranges through rotational positioning of the flutes, resolving the contradiction between adaptability and productivity.
Solution Approach 2:
The patent changes the operational parameter from linear displacement to rotational angle. The fluted spool responds to temperature changes by rotating to different angular positions, where each angle corresponds to a specific flow rate. This parameter transformation enables the valve to achieve both broad temperature control range and high flow rate ratings simultaneously.
3Ease of manufacture
If prior thermal control valves used conventional linear approach, then the valve could be manufactured with standard processes, but the weight increased
Solution Approach 1:
The fluted spool rotational mechanism uses dynamic pressure differentials created by the flute geometry to actuate the valve. This eliminates the need for heavy linear guides, bearings, and long spool assemblies required in conventional linear valves. The rotational design achieves the same control function with significantly reduced mass while remaining manufacturable with standard processes.
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 solution provides a compact, lightweight thermal control valve with improved flow rate capacity, reduced size, and enhanced temperature control accuracy, suitable for a wide range of ambient temperature extremes, effectively addressing the limitations of existing state-of-the-art valves.
Implementation Method 1
When the temperature-sensing material experiences a temperature increase, the substance expands in volume. The expansion pushes against the rod forcing the rod to extend out of the cylinder. When the temperature of the temperature-sensing material cools, the volume of the substance contracts which pulls the rod inside the cylinder.
Data Source
AI summary
A passive thermal control valve comprising a thermal actuator coupled to a valve body having first and second ports. The thermal actuator including an actuator body having an inner bore. An adjustment stop engages the actuator body. A cylinder is received within the actuator body inner bore and the cylinder has a cylinder bore open at one end. An actuator spring within the actuator body biases the cylinder towards the adjustment stop. An actuator rod is at least partially received within the cylinder and has first and second ends. At least a portion of the actuator rod is allowed to extend through the open cylinder bore. A sealing element forms a seal between the actuator rod and the cylinder and defines a sealed chamber within the cylinder. A thermal fluid is contained within the cylinder. A lever mechanism is connected to the valve body and includes a lever having a first end connected to the valve body. A valve spool is connected to a lever second end. The valve spool is arranged and designed to close the first port and allow a system fluid to flow through the second port, close the second port and allow the system fluid to flow through the first port, or allow the system fluid to flow through both the first and second ports.