Blow Valve Curved Guide Surfaces for Pressure Loss Reduction
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Solution Overview
Problem
Existing blow valves in blow molding machines suffer from high pressure losses and long switching differences due to turbulent flow and dead spaces, making them difficult to clean and inefficient in compressed air consumption.
Innovation Solution
The implementation of inclined guide surfaces on the piston extension and wall, which are concavely rounded, minimizes turbulence and pressure losses by guiding the flow efficiently from the inflow to the outflow channel, reducing dead spaces and enhancing cleanability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If flat surfaces perpendicular to the shifting direction are used in the valve chamber, then the manufacturing is simple, but pressure losses increase and flow turbulence worsens
Solution Approach 1:
The patent applies curved guide surfaces instead of flat surfaces in the valve chamber. The guide surfaces are designed with specific curvature radii (R1, R2, R3) to smoothly guide the flow from the inflow channel through the valve chamber to the outflow channel, eliminating sharp edges and corners that cause turbulence and pressure losses while maintaining manufacturability.
2Device complexity
If flat surfaces perpendicular to the shifting direction are used, then the structure is simple, but dead spaces increase and cleanability deteriorates
Solution Approach 1:
The curved guide surfaces eliminate dead spaces by creating smooth, continuous flow paths without sharp corners where fluid could stagnate. The rounded transitions ensure that cleaning media can effectively reach all surfaces, improving cleanability without significantly increasing structural complexity.
3Device complexity
If the flow expands into the large-volume cylindrical valve chamber, then the valve structure is simple, but switching differences increase and efficiency decreases
Solution Approach 1:
The guide surfaces with optimized curvature radii create a streamlined flow path that reduces the effective volume the flow must traverse. The curved surfaces accelerate the flow smoothly through the valve chamber, reducing the switching time difference between valve opening and preform pressurization while maintaining the simple cylindrical valve chamber structure.
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 achieves minimal pressure losses and short switching differences, ensuring efficient airflow and easy cleaning of the blow valve by reducing swirl formation and maintaining high tightness in the shut-off position.
Implementation Method 1
the respective guide surface, facing the flow, is concavely rounded at least in portions. A concave rounding considerably improves the flow pattern in the flow and thus reduces the pressure loss caused during deflection.
Data Source
AI summary
A blow valve of a blow-molding machine for containers, having a valve seat which is arranged in a valve chamber between an inflow channel mouth and an outflow channel mouth and has assigned thereto a valve piston which is shiftable linearly between a shut-off position and a lifted open position and which with a piston extension carrying a closing surface passes sealingly shiftably through a bore of a wall defining the valve chamber, wherein a flow path which extends through the valve chamber between the mouths is shut off in the shut-off position and released in the open position, at least one guide surface which is generally inclined relative to the shifting direction of the valve piston is provided for the lateral forced deflection of the flow on the wall and/or on the piston extension.