PTFE Delivery Pipe Section for Container Treatment Machine
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Solution Overview
Problem
Container treatment machines experience cyclic bending stresses and microcracks in stainless steel delivery pipes due to production and operational tolerances, limiting their reliability, especially when handling liquids with aggressive gases or substances under pressure or varying temperatures.
Innovation Solution
A delivery pipe section made from flexible, pressure- and temperature-resistant polytetrafluoroethylene (PTFE) material with a 90° knee bend and straight legs, allowing for absorption of operational movements and compensation of mounting tolerances, while being acid- and alkali-resistant and suitable for foodstuffs, preventing microcracks and damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a curved section of stainless steel delivery pipe is used to connect the tank and valve housing, then the structural strength and pressure resistance are improved, but cyclic bending stresses lead to microcracks and damages over time
Solution Approach 1:
The patent replaces the rigid curved stainless steel pipe section with a flexible hose that can absorb cyclic bending stresses through elastic deformation. The flexible hose accommodates relative positional changes between the tank and valve housing during operation without generating damaging stress concentrations, thereby preventing microcrack formation while maintaining pressure resistance.
Solution Approach 2:
The patent changes the material parameters from rigid stainless steel to flexible hose material with appropriate elasticity. This parameter change allows the delivery pipe to adapt to operational movements and mounting tolerances while maintaining sufficient pressure resistance, resolving the contradiction between structural strength and reliability.
2Reliability
If flexible hoses are used to connect the tank and valve housings, then mounting tolerances and operational movements are compensated, but the hoses age and become brittle over time
Solution Approach 1:
The patent employs a composite construction where the flexible hose is reinforced with spiral wire winding or braided mesh. This composite structure combines the flexibility and elasticity of the hose material with the strength and durability of the metallic reinforcement, preventing the hose from becoming brittle while maintaining its ability to compensate for mounting tolerances and operational movements.
Solution Approach 2:
The patent incorporates reinforcement elements in advance within the hose structure to prevent future degradation. The spiral wire winding or braided mesh provides preemptive structural support that prevents the hose material from aging and becoming brittle, thereby extending service life while maintaining flexibility.
3Temperature
If stainless steel pipes are used for delivery, then pressure resistance and temperature resistance are achieved, but cyclic bending stresses from operational movements cause microcracks
Solution Approach 1:
The patent replaces the temperature-resistant but brittle curved stainless steel pipe with a flexible hose that can withstand temperature variations while absorbing mechanical stresses. The flexible hose maintains sufficient temperature resistance for the application while its elasticity prevents microcrack formation from cyclic bending stresses during operational movements.
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 PTFE delivery pipe section effectively absorbs operational movements, withstands maximum filling pressures and temperatures, and resists aggressive substances, enhancing the reliability and hygiene of container treatment machines by preventing microcracks and allowing for easy cleaning.
Implementation Method 1
The section of the delivery pipe, which is manufactured integrally from a plastic material, has, due to its material, such a flexibility that operation-dependent relative movements between the tank and the valve housings and the flow meter, respectively, are absorbed without there being a risk of microcracks
Data Source
AI summary
A container treatment machine with a tank and spaced-apart valve housings, wherein a pressure-resistant delivery pipe having a curved section is provided between the tank and each valve housing directly or via an intermediate flow regulator, the delivery pipe being composed, at least in its curved section, of a hard plastic which is pressure- and temperature-resistant, and is acid- and alkali-resistant and permissible for foodstuffs, in particular polytetrafluoroethylene (PTFE or Teflon).