Elastomeric Disc Valve Support Plate Ports Combustion Pressure
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Solution Overview
Problem
Existing combustion driven fastener hand tools face inefficiencies and reduced power delivery due to inadequate control valve designs, which fail to effectively manage combustion pressure between the two portions of the combustion chamber, leading to suboptimal performance and reliability.
Innovation Solution
A valve support system utilizing a flexible disc affixed to a central shaft with a support plate having one or more ports, allowing free flow of combustion pressure between the two portions of the combustion chamber while blocking reverse pressure, thereby enhancing power delivery and tool efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a control valve is used between two portions of a combustion chamber, then power output and efficiency are improved, but the valve must withstand high combustion pressure which creates reliability issues
Solution Approach 1:
The valve assembly is segmented into multiple functional components: a flexible disc for pressure sealing, a support plate for structural stability, a central shaft for actuation, and a valve seat for sealing. This segmentation allows each component to be optimized for its specific function while working together to solve the contradiction between power handling and reliability.
Solution Approach 2:
The support plate extends beyond the flexible disc to provide additional structural support and stability. This excessive action of the support plate beyond what is minimally required for disc attachment provides the extra strength needed to withstand high combustion pressures, thereby improving reliability without compromising the power handling capability.
2Productivity
If a flexible disc valve is used to control combustion pressure, then efficiency is improved, but the valve collapses under reverse pressure reducing performance
Solution Approach 1:
The support plate acts as a counterweight or counter-force structure against the flexible disc. When reverse pressure is applied, the rigid support plate provides the opposing force needed to prevent disc collapse, maintaining the valve's ability to control combustion pressure efficiently while preserving power delivery capability.
Solution Approach 2:
The valve assembly combines different material properties: the flexible disc provides elastic sealing and pressure response, while the rigid support plate provides structural strength and stability. This composite structure leverages the advantages of both flexible and rigid materials to solve the contradiction between efficiency and power delivery.
3Reliability
If the support plate is made rigid to prevent disc collapse, then reliability is improved, but combustion pressure flow is blocked reducing efficiency
Solution Approach 1:
The support plate has non-uniform geometry with varying thickness and features strategic openings. The plate is rigid where needed for structural support but incorporates localized flexible regions and openings that allow combustion pressure to pass through. This local quality variation resolves the contradiction by providing rigidity for reliability while maintaining pressure flow paths for efficiency.
Solution Approach 2:
The support plate incorporates openings or porous structures that allow combustion pressure to flow through the plate while the overall plate structure maintains its rigidity. This porous design enables the plate to provide structural support without blocking the necessary pressure flow, thus resolving the contradiction between reliability and productivity.
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 significantly improves the power output and efficiency of combustion driven fastener hand tools by allowing free flow of combustion pressure in the forward direction while preventing reverse pressure flow, leading to enhanced performance and extended tool life.
Implementation Method 1
a flexible disc affixed to a movable central shaft wherein the control valve is disposed in an open position with a circumferential edge of the flexible disc distal from a valve seat
Implementation Method 2
one or more ports through the plate such that the one or more ports allow combustion pressure to flow freely between the two portions of the combustion chamber with the control valve in the closed position under forward combustion pressure
Implementation Method 3
combustion driven fastener hand tool
Data Source
AI summary
A valve support for use with a valve in a combustion driven fastener hand tool, the valve being formed by a flexible disc affixed to a central shaft having a circumferential edge resting against an anular valve seat affixed to a wall of a combustion chamber with the valve in a closed position is disclosed. The valve support comprises a plate affixed to the central shaft and against the flexible disc, the plate having one or more ports therethrough. In a closed position, the flexible disc has a circumferential edge resting against an anular valve seat affixed to a wall of a combustion chamber but also a central portion of the flexible disc is proximate or contacting a central portion of the support plate on the same side of the disc as the annular valve seat. Various port configuration are possible.