Oxygen Fire Shutoff Valve With Isolated Torsion Spring
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Solution Overview
Problem
Existing fire protection devices for oxygen therapy instruments and ventilation systems face issues such as oxidation failure of metal springs in oxygen-rich environments, leading to potential oxygen leakage during fires, instability in gas path management, and slow melting speeds of supports that hinder rapid fire suppression.
Innovation Solution
A fire protection device with a housing, torsion spring, and meltable member, where the meltable member supports the valve body in an open state and the torsion spring drives it to a closed state upon melting, independently housing the torsion spring to prevent oxidation and enhance durability and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal spring is provided inside the fire protection device to drive the sealing valve, then the sealing valve can be driven to block the gas path, but the metal spring is prone to oxidation failure in the oxygen-rich environment
Solution Approach 1:
The patent extracts the harmful metal spring from the oxygen-rich environment by providing a separate accommodating cavity that is isolated from the oxygen pathway. The elastic member is housed in this cavity, preventing direct contact with oxygen and eliminating the oxidation risk while maintaining its driving function for the sealing valve.
Solution Approach 2:
The fire protection device is segmented into distinct functional zones: the oxygen pathway for gas flow and the accommodating cavity for housing the elastic member. This segmentation isolates the elastic member from oxygen, preventing oxidation while maintaining system functionality.
2Productivity
If holes are opened on the support to ensure oxygen passage, then oxygen can flow through the fire protection device, but the gas path stability is reduced and it is easy to block
Solution Approach 1:
The patent removes the problematic holes from the support structure. Instead of opening holes that compromise stability, the support maintains its structural integrity while the sealing valve provides controlled oxygen passage when needed, eliminating the instability caused by hole-based flow paths.
Solution Approach 2:
The sealing valve acts as an intermediary that controls oxygen flow without requiring holes in the support. It provides a stable, controllable passage for oxygen while maintaining the structural integrity of the support, avoiding the blockage issues associated with hole-based designs.
3Reliability
If the support melts slowly to drive the sealing valve, then the sealing valve can be driven to block the gas path, but the fire protection response is delayed
Solution Approach 1:
The patent replaces the thermal-mechanical melting mechanism with a direct elastic response mechanism. The elastic member, pre-loaded in the accommodating cavity, immediately drives the sealing valve when the support melts, eliminating the delay caused by slow melting and ensuring rapid fire protection response.
Solution Approach 2:
The elastic member is pre-loaded and positioned in the accommodating cavity during normal operation, ready to immediately drive the sealing valve when triggered by support melting. This preliminary preparation eliminates response delay, ensuring the sealing valve is driven rapidly when fire protection is needed.
4Ease of operation
If the sealing valve moves inside the fire protection device without proper guidance, then the valve can reach the opening, but the sealing valve is deflected and cannot be accurately engaged
Solution Approach 1:
The patent introduces a guide structure as an intermediary between the elastic member and the sealing valve. This guide ensures the sealing valve moves along the correct trajectory and is accurately positioned at the opening, preventing deflection and ensuring precise engagement for effective sealing.
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 prevents oxygen leakage during fires by rapidly closing the gas path and improves the stability and safety of the fire protection device by avoiding oxidation of the torsion spring and ensuring timely fire suppression.
Implementation Method 1
After the support is melted by heat, the sealing valve is driven by a spring to move to the opening and is engaged with the opening to block a gas path
Implementation Method 2
a torsion spring embedded in the accommodating cavity, wherein the torsion spring is used for driving the valve body to rotate to a closed state
Data Source
AI summary
A fire protection device includes a housing, a valve body, a torsion spring, and a meltable member, a fluid passage is provided in the housing, the fluid passage is provided with a first opening and a second opening, the first opening and the second opening are used for connecting with a pipeline of an oxygen therapy instrument or a patient end, respectively; the valve body is located in the fluid passage and is rotatably connected to the housing; the valve body is provided with an accommodating cavity, and the fluid passage and the accommodating cavity are two spaces independent from each other; the torsion spring is embedded in the accommodating cavity so as to drive the relative rotation of the valve body and the housing; and the meltable member is disposed on an inner wall of the fluid passage.