Rotary Decoupling Device for Lifting Valve Axial Load Absorption
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Solution Overview
Problem
Existing lift valves with rotary decoupling devices face malfunctions due to significant axial forces during switching, leading to incomplete decoupling and rotation of the valve stem and actuator stem, particularly in larger sizes with high air pressures.
Innovation Solution
A lift valve with a rotary decoupling device featuring two shell segments that form a positive fit with the valve rod and drive rod, allowing secure guidance of rotational movement while absorbing large axial loads through a radially outer force-transmitting element, reducing the number of components and simplifying assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional rotary decoupling devices are used in large poppet valves with high air pressure, then the valve can switch, but significant axial forces cause malfunction and loss of decoupling
Solution Approach 1:
The invention moves the force-transmitting element from the central axis to the radially outer region of the rods. This dimensional change allows the force to be transmitted at a larger lever arm distance from the rotation axis, improving the mechanical advantage and ability to absorb axial loads while maintaining rotational decoupling.
Solution Approach 2:
The rotary decoupling device is segmented into a drive rod with coupling elements, a valve rod, and multiple shell segments that form a positive connection. This segmentation allows the force transmission path to be distributed through multiple contact points (projections and grooves) rather than a single central connection, enhancing the device's capacity to handle high axial forces.
2Force
If the force-transmitting element is located in the radially outer region, then absorption of high axial loads is improved, but device complexity increases
Solution Approach 1:
The invention merges multiple functions into the shell segments: they provide the positive connection for force transmission, guide the rotational movement, and contain the coupling elements. By combining these functions into a single integrated component rather than separate elements, the device achieves high load absorption capability without proportionally increasing complexity.
Solution Approach 2:
The shell segments serve multiple purposes simultaneously: they form the positive connection with projections and grooves for force transmission, provide guidance for rotational movement, and structurally support the coupling elements. This multi-functionality reduces the need for additional specialized components, keeping the overall device complexity manageable.
3Force
If a positive fit connection is used between shell segments and rods, then force transmission is improved, but manufacturing precision requirements increase
Solution Approach 1:
The positive fit connection is implemented locally at specific projection and groove interfaces rather than requiring precision across the entire component surface. This localized approach concentrates the precision requirements to discrete contact points, making manufacturing more feasible while still achieving reliable 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 effectively absorbs large axial loads, preventing malfunctions and ensuring reliable decoupling, even under high pressures, by securely transmitting forces and allowing rotational movement without transferring torque to the closing body and membrane.
Implementation Method 1
An elastic element is provided that presses the valve stem and the valve member away from each other and against the coupling elements, respectively, for a backlash-free arrangement
Data Source
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AI summary
The invention relates to a lifting valve having a closing body (5), a valve rod (20) which is connected to the closing body (5), and a lifting drive (8), by means of which a lift of the closing body (5) can be brought about, a drive rod (16) which is operatively connected to the valve rod (20), and a rotational decoupling device (27) which is provided between the valve rod (20) and the drive rod (16). In order to provide a rotational decoupling device (27) of simple construction which is suitable for absorbing great axial loads, it is proposed that the rotational decoupling device (27) comprises at least two shell segments (31, 32), the drive rod (16) has a coupling element (28), and the shell segments (31, 32) form a positively locking connection in the direction of the lifting movement with the valve rod (20) and a positively locking connection in the direction of the lifting movement with the coupling element (28).