Hydraulic Valve Throttle Point Dampens Seat Impact
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Solution Overview
Problem
Changeover seat valves and power isolating switching devices face challenges in achieving a long service life and rapid changeover time due to premature wear and pressure shocks, which are exacerbated by hard impacts between the seat surface and valve seat, and undesirable pressure shocks in the system.
Innovation Solution
Incorporating a throttle point in the flow path to the tank to dampen the impact of the seat surface on the valve seat, minimizing pressure shocks, and using a mechanical latch for self-retention in switching positions, ensuring the throttling effect is strongest when the piston reaches the valve seat, thus reducing wear and maintaining quick contact separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the piston moves rapidly to achieve short changeover time, then the changeover speed is improved, but hard impact occurs between the seat surface and valve seat causing premature wear
Solution Approach 1:
A throttle point is introduced in the flow path to the tank to create beforehand cushioning of the pressure medium. This throttle point restricts the flow of pressure medium during piston movement, creating a damping effect that cushions the impact before the seat surface contacts the valve seat, thereby preventing premature wear while maintaining rapid changeover
2Loss of time
If the piston is accelerated strongly to reach cut-off switch position at maximum speed, then the changeover time is reduced, but hard impact occurs causing wear on the valve seat
Solution Approach 1:
The throttle point acts as an intermediary element in the hydraulic system. It mediates between the rapid piston movement and the final impact by controlling the pressure medium flow, thereby reducing the hard impact on the valve seat while preserving the quick changeover performance
3Object-affected harmful factors
If additional structural measures with grooves and collars are provided on the piston to throttle flow, then hard impact is reduced, but the changeover time is unduly increased
Solution Approach 1:
Instead of adding complex grooves and collars to the piston structure, the invention extracts the throttling function to a separate, simple throttle point in the flow path. This separate throttling element achieves impact reduction without the structural complexity and time penalty of modifying the piston itself
4Productivity
If the consumer connection is connected to both pressure connection and tank connection during piston movement, then pressure shocks occur causing delay in contact separation
Solution Approach 1:
The throttle point converts the potentially harmful pressure shocks into a beneficial damping effect. By restricting the pressure medium flow, the throttle point transforms sudden pressure surges into controlled, gradual pressure changes that protect the system while maintaining efficient contact separation
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 extends the service life of changeover seat valves and power disconnect devices by minimizing wear on contacts and preventing pressure shocks, allowing for rapid and continuous contact separation without delays, meeting high demands for reliability and longevity.
Implementation Method 1
By displacing a pressure medium volume through at least one throttle point and a flow path to the tank, not only can the impact of the seat surface on the valve seat be dampened
Implementation Method 2
dampen the movement of the piston to the valve seat and thus protects the valve seat, and pressure shocks in the system are surprisingly reduced or largely prevented
Data Source
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AI summary
The valve (V) has a piston (13) linearly movable between two switching positions in a chamber (26). A flow path (21) for a pressurizing medium is provided to a tank, where the medium is displaced from a part of a front end of the piston during movement of the piston. The flow path has a throttle point (23) that damps superimposing of a seat surface on a valve seat with increasing throttle effect in a movement direction of the piston in one of switching positions connecting a working connection (10) in the chamber with a tank connection (11). An independent claim is also included for a power-circuit breaker device comprising a hydraulic cylinder.