Dual-Pressure Valve Unit for Fast Compact Blow-Molding Switching
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Solution Overview
Problem
Existing valve units for blow-moulding machines, particularly in stretch blow-moulding, have large space requirements, high production and maintenance costs due to multiple seals, and increased friction, which complicates achieving rapid switching and compact design.
Innovation Solution
A valve unit design utilizing a movable piston subjected to two control pressures, where one pressure is constant and acts as an air spring, allowing for rapid actuation with a single pilot valve, reducing the number of seals and optimizing compactness and switching behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing valve units with multiple control chambers and seals are used, then the valve can be actuated, but the space requirement increases and the device becomes more complex
Solution Approach 1:
The patent merges the functions of multiple control chambers into a single integrated control chamber. The piston rod passes through the piston, and the control pressure is applied to the piston rod rather than requiring separate control chambers on both sides of the piston. This consolidation reduces the number of components and simplifies the overall valve structure while maintaining the actuation capability.
Solution Approach 2:
The invention extracts and eliminates the need for multiple seals by redesigning the control mechanism. Instead of requiring seals for multiple control chambers and piston rod connections, the design uses a single control chamber with the piston rod extending through it, reducing the number of sealing points and associated complexity.
2Reliability
If existing valve units with multiple seals are used, then the valve can be sealed properly, but the production and maintenance costs increase
Solution Approach 1:
The patent combines multiple sealing functions into fewer sealing points. By using a single control chamber and having the piston rod pass through it with minimal sealing requirements, the design reduces the total number of seals needed compared to traditional designs with multiple control chambers requiring multiple seals for each chamber and connection point.
3Reliability
If existing valve units with multiple seals are used, then the valve can maintain pressure, but the friction increases
Solution Approach 1:
The invention removes unnecessary seals that generate friction. By eliminating multiple control chambers and their associated seals, the design reduces the number of contact points where friction occurs. The piston rod passes through the control chamber with minimal sealing, significantly reducing overall friction in the valve mechanism while still maintaining the necessary pressure containment.
4Volume of stationary object
If compact valve design is pursued, then the space requirement is reduced, but achieving rapid switching becomes more difficult
Solution Approach 1:
The patent achieves compactness by merging multiple control chambers into a single control chamber. This consolidation reduces the overall valve volume while maintaining the necessary control functionality. The simplified structure with fewer components actually facilitates faster switching by reducing the mass that needs to be moved and minimizing the complexity of the control mechanism.
Solution Approach 2:
The design segments the control function by applying control pressure directly to the piston rod, which then actuates the piston. This segmentation of the control mechanism from traditional multi-chamber designs allows for a more compact configuration that maintains rapid response capability through direct force transmission.
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 rapid and efficient valve operation with reduced production costs and minimized friction, achieving the desired reaction times and compact design for blow-moulding applications.
Implementation Method 1
the piston is permanently subjected to the first control pressure
Implementation Method 2
the piston is moved by means of the first control pressure and the second control pressure
Implementation Method 3
the piston is additionally subjected to the second control pressure for moving the piston in one direction
Implementation Method 4
the piston is moved by means of the first control pressure and the second control pressure
Implementation Method 5
in the operating state of the valve unit the piston is permanently subjected to the first control pressure and the piston is additionally subjected to the second control pressure for moving the piston in one direction
Data Source
AI summary
Method for actuating a valve unit, which has a process pressure inlet, a process pressure outlet and a valve chamber connecting the process pressure inlet to the process pressure outlet and a movable piston for closing and opening the connection between the process pressure inlet and the process pressure outlet. The piston is able to be subjected on a first side to a first control pressure and the piston is able to be subjected on a second side to a second control pressure. The piston is moved by means of the first control pressure and the second control pressure for the purpose of closing and opening the connection. In the operating state of the valve unit, the piston is permanently subjected to the first control pressure, wherein the piston is additionally subjected to the second control pressure for moving the piston in one direction and wherein a pressure which is higher than atmospheric pressure and lower than the second control pressure is used as the first control pressure.