Tangential Cap for Pneumatic Percussion Air Flow Control
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Solution Overview
Problem
Existing hand-held power tools with pneumatic impact mechanisms face inefficiencies due to air flow turbulence and mutual interference between the guide tube and surrounding assemblies, leading to suboptimal performance and undefined flow properties.
Innovation Solution
A cap on the guide tube, integral with it and having no seams, directs air flow tangentially to minimize turbulence, and a support tube arrangement allows the guide tube to move unhindered, with compensating and shutdown openings optimizing air flow and pressure management within the pneumatic chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the guide tube is surrounded by other components arranged telescopically inside one another, then the air flow can move unhindered along the guide tube over longer distances and mutual influence is reduced, but the air flow flowing radially out of the guide tube can still strike components at short distances and cause turbulence and undefined flow characteristics
Solution Approach 1:
A cap is introduced as an intermediary component that covers the radial opening of the guide tube. This cap directs the air flow in a defined manner essentially parallel to the guide tube, preventing the air flow from directly striking surrounding components and causing turbulence. The cap acts as a mediator between the pneumatic chamber and the surrounding components, controlling the air flow path.
Solution Approach 2:
The cap changes the flow parameters of the air by directing it predominantly in a parallel direction rather than radially outward. This parameter change in flow direction reduces turbulence and defines the flow characteristics, transforming the undefined radial flow into a controlled parallel flow.
2Reliability
If the cap is formed by a protrusion of the guide tube with seamless integration, then undefined turbulence from seams is eliminated, but the manufacturing precision requirements increase
Solution Approach 1:
The cap is merged with the guide tube to form an integral, seamless structure. This combining of two components into one eliminates the seams that would cause undefined turbulence in the air flow. The seamless integration ensures smooth air flow transitions without disruption from joints or interfaces.
3Reliability
If the cap has a predominantly tangential recess with maximum 45 degrees inclination, then the air flow is directed in a controlled parallel manner, but the structural complexity of the cap increases
Solution Approach 1:
The cap features an asymmetric recess design with a predominantly tangential orientation and maximum 45 degrees inclination. This asymmetric geometry is specifically designed to direct the air flow in a controlled manner essentially parallel to the guide tube. The asymmetric shape creates a defined flow path that prevents radial outward flow and turbulence.
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
This design enhances the pneumatic impact mechanism's efficiency by reducing air flow turbulence and interference, maintaining optimal air spring stiffness and ensuring consistent performance by directing air flow in a controlled manner, thus improving the tool's operational reliability and effectiveness.
Implementation Method 1
The cap is open in a direction predominantly tangential to the guide tube. The cap directs an air flow from the pneumatic chamber in a defined manner in a direction essentially parallel to the guide tube.
Implementation Method 2
a pneumatic percussion mechanism for periodically generating impacts on the tool held in the tool holder. The percussion mechanism comprises a guide tube, an excitation piston, a striker, a pneumatic chamber enclosed by the excitation piston and the striker in the guide tube
Implementation Method 3
maintaining optimal air spring stiffness
Data Source
Figure 1~3
AI summary
The invention relates to a hand-held power tool 1 with a tool holder 2 for holding a tool 3 and a pneumatic percussive mechanism 8 for periodically generating percussions on the tool 3 held in the tool holder. The percussive mechanism 8 comprises a guide tube 15, an excitation piston 13, a striker 9, a pneumatic chamber 14 which is enclosed in the guide tube by the excitation piston 3 and the striker 9, and a compensating opening 17 in the guide tube for ventilating the pneumatic chamber 14. A cap covers the compensating opening 17 on an exterior of the guide tube 15. The cap is open in an opening direction largely tangential to the guide tube 15.