Thermal Insulating Bushing for Underwater Pressure Regulator
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Solution Overview
Problem
Underwater pressure regulators for breathing apparatuses face issues with localized freezing in cold water environments due to the adiabatic process of pressure reduction, which can affect the operation of moving mechanisms and springs, leading to potential valve malfunction.
Innovation Solution
A first-stage pressure regulator with an annular insulating bushing made of thermal plastic material is integrated into the pressure compensation chamber, along with a biasing member and a thermally insulated coil spring, to reduce heat transfer and prevent freezing by insulating key surfaces and components from the surrounding water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If pressure reduction is performed through adiabatic process, then pressure regulation function is achieved, but heat energy is absorbed from surrounding water causing localized freezing
Solution Approach 1:
The patent introduces a thermal insulating bushing as an intermediary component between the pressure compensation chamber and the surrounding water. This bushing mediates the thermal interaction by blocking heat transfer from the water to the regulator components, thereby preventing freezing while allowing the adiabatic pressure reduction process to continue functioning.
Solution Approach 2:
The patent converts the harmful freezing effect caused by adiabatic cooling into a beneficial insulated environment. By strategically insulating specific components (valve body, biasing member, spring) that are susceptible to freezing, the harmful cold is redirected away from critical moving parts, allowing the pressure reduction process to benefit from the insulation without compromising its adiabatic function.
2Reliability
If water in pressure compensation chamber freezes, then ice forms on exposed surfaces, but movement and operation of valve mechanism and spring are affected
Solution Approach 1:
The thermal insulating bushing serves as a protective intermediary between the cold water environment and the valve mechanism components. It prevents direct thermal contact that would cause ice formation, thereby maintaining reliable operation of the valve mechanism and spring without compromising the pressure compensation function.
Solution Approach 2:
The patent segments the pressure compensation chamber into insulated and non-insulated zones. Critical components (valve body, biasing member, spring) are placed within the insulated zone protected by the thermal insulating bushing, while other areas remain exposed to water. This segmentation allows selective protection of temperature-sensitive components while maintaining overall system functionality.
3Reliability
If thermal insulation is added to prevent freezing, then heat transfer is reduced and freezing is inhibited, but device complexity increases
Solution Approach 1:
The patent applies thermal insulation selectively only to specific components and regions that are most susceptible to freezing (valve body, biasing member, spring within the pressure compensation chamber) rather than insulating the entire regulator. This localized approach prevents freezing where it would be most harmful while minimizing the addition of complexity to the overall device structure.
Solution Approach 2:
The thermal insulating bushing is designed as a simple intermediary component that can be integrated into the existing pressure compensation chamber structure. It provides effective thermal protection through a straightforward geometric form that minimizes structural complexity while achieving the freezing prevention objective.
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 effectively inhibits freezing within the pressure compensation chamber, ensuring the reliable operation of the pressure regulator during cold water dives by reducing heat transfer and maintaining the functionality of the valve mechanism.
Implementation Method 1
the process of reducing the pressure of the gas from the inlet pressure to the outlet pressure is an adiabatic process that absorbs heat energy from the surrounding environment, namely the surrounding water
Implementation Method 2
A first stage pressure regulator with an annular insulating bushing made of thermal plastic material is integrated into the pressure compensation chamber, along with a biasing member and a thermally insulated coil spring, to reduce heat transfer and prevent freezing by insulating key surfaces and components from the surrounding water
Data Source
Figure 1
AI summary
A first stage pressure regulator is provided. The regulator includes a valve body having an inlet and an outlet coupled by a pressure chamber. A pressure compensation chamber fluidly communicates with the surrounding water. A valve member is slidably carried by the valve body between an open state in which fluid is permitted to flow between the inlet and outlet and a closed state in which fluid is prevented from flowing between the inlet and outlet. The valve member has an expansion head that is operably acted upon by the surrounding water within the pressure compensation chamber to bias the valve member toward the open state. The regulator includes an annular insulating bushing within the compensation chamber that covers a portion of the valve body defining a portion of the pressure compensation chamber to insulate the valve body from the water within the pressure compensation chamber.