Pneumatic Tool Pressure Adjusting Mechanism Design
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Solution Overview
Problem
Existing pneumatic tools face challenges in reducing the full length of the tool while maintaining effective pressure regulation, as the valve mechanism for depressurizing or pressure regulation increases the tool's size and requires a large operating load, and is sensitive to fluctuations in primary pressure.
Innovation Solution
A pneumatic tool with a pressure adjusting mechanism that includes a valve body, an elastic body, and a pressure receiving member, where the elastic body is positioned closer to the air intake, and a load reducing mechanism that adjusts the urging force of the elastic body to reduce the operating load, while maintaining stable secondary pressure despite fluctuations in primary pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a valve mechanism for pressure regulation is provided, then the pressure of compressed air can be adjusted, but the size of the driving tool increases
Solution Approach 1:
The pressure adjusting mechanism is nested within the grip structure of the driving tool. The valve body is positioned inside the grip, and the air plug is arranged to extend from the grip end, allowing the pressure regulation function to be integrated without significantly increasing the overall tool length.
Solution Approach 2:
The air plug is arranged to extend in the axial direction from the grip end, utilizing the longitudinal dimension rather than increasing radial dimensions. This allows the pressure adjustment mechanism to be compact in cross-section while maintaining functionality through axial extension.
2Stress or pressure
If the spring load of the pressure adjusting mechanism is increased to maintain higher set pressure, then the pressure regulation capability is improved, but the operating load increases making it difficult for users to operate
Solution Approach 1:
A dial is provided as an intermediary operating mechanism that converts rotational motion into axial movement of the valve body. The dial allows users to adjust pressure by rotating it, which indirectly actuates the valve body through a cam mechanism, reducing the direct operating load compared to manually pushing the valve body.
Solution Approach 2:
The cam mechanism converts the rotational motion of the dial into axial movement of the valve body, creating a mechanical advantage that reduces the operating force required. The cam profile is designed to provide gradual pressure adjustment while maintaining low operating load throughout the adjustment range.
3Device complexity
If a direct-acting pressure adjusting mechanism is used, then the structure is simplified, but the secondary pressure becomes unstable when primary pressure fluctuates
Solution Approach 1:
The pressure adjusting mechanism uses the secondary pressure itself to act on the valve body, creating a feedback loop. When secondary pressure increases, it pushes the valve body to close the flow path, and when secondary pressure decreases, the spring opens the flow path to replenish pressure. This self-regulating feedback mechanism maintains stable secondary pressure even when primary pressure fluctuates.
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 enables a shorter full length of the pneumatic tool, reduces the operating load of the pressure adjusting mechanism, and maintains stable secondary pressure, even when primary pressure fluctuates.
Implementation Method 1
an elastic body configured to exert an urging force to the valve body to open the flow path
Implementation Method 2
a pressure receiving member configured to receive air pressure in the air chamber and exert an urging force in a direction of closing the flow path
Data Source
AI summary
A pneumatic tool includes a drive mechanism configured to be driven by compressed air supplied from an air intake; an air chamber configured to store the compressed air supplied; and a pressure adjusting mechanism configured to adjust the pressure of the compressed air in the air chamber. The pressure adjusting mechanism includes a valve body configured to open and close a flow path that communicates the air intake and the air chamber with each other; an elastic body configured to exert an urging force to the valve body to open the flow path; and a pressure receiving member configured to receive air pressure in the air chamber and exert an urging force in a direction of closing the flow path to the elastic body. The elastic body is arranged at a position closer to the air intake than the valve body.