Frequency Selective Damper Valve With Control Chamber Pressure Relief
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Solution Overview
Problem
Existing frequency selective damper valves struggle with non-linear closing force dependence on pressure and time, manufacturing tolerances, and lack of pressure relief mechanisms, which affects their performance and robustness in applications like shock absorbers.
Innovation Solution
A damper valve design incorporating a controlled flow channel, movable valve body, and a control chamber with a pressure relief valve that resets pressure levels by bypassing the flow restriction, allowing for a proportional relation between closing force and time, and integrating a pressure relief mechanism upstream of the valve to manage manufacturing tolerances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a frequency selective valve is added to provide frequency selective damping behavior, then damping performance is improved, but device complexity increases
Solution Approach 1:
The frequency selective valve is integrated into the existing damper structure by combining it with the piston rod and control chamber, merging multiple functions into a unified component rather than adding a separate standalone valve assembly
Solution Approach 2:
The control chamber serves multiple functions: it acts as a pressure accumulation space for frequency selective damping, a control volume for the valve operation, and integrates with the piston rod structure, allowing one component to fulfill several roles in the system
2Force
If pressure increases in the control chamber to control closing force, then closing force control is improved, but pressure relief capability deteriorates
Solution Approach 1:
The pressure relief valve is pre-configured with a relief opening positioned upstream of the main valve, allowing pressure to be relieved before it can build up to harmful levels in the control chamber, preventing pressure-related problems before they occur
Solution Approach 2:
The pressure relief valve acts as an intermediary mechanism between the control chamber and the external environment, providing a controlled pathway for pressure relief that protects the main valve and control system from pressure buildup
3Force
If closing force shows strong non-linear dependence on pressure, then pressure control capability is improved, but predictability of closing force over time deteriorates
Solution Approach 1:
The bias spring is pre-loaded during assembly to provide an initial closing force that compensates for the non-linear pressure dependence, establishing a predictable baseline closing force before dynamic pressure effects occur
Solution Approach 2:
The system exploits changes in control chamber volume as pressure builds, where the expanding volume modifies the pressure-closing force relationship to achieve a more linear and predictable closing force profile over time
4Ease of manufacture
If manufacturing tolerances are present in valve components, then ease of manufacture is improved, but performance consistency deteriorates
Solution Approach 1:
The bias spring is pre-loaded to a specific force during assembly that compensates for expected manufacturing tolerances in valve seat dimensions and flow restriction geometries, ensuring consistent performance across produced units without requiring tight manufacturing tolerances
Solution Approach 2:
The system uses the adjustable bias spring force as a tuning parameter to compensate for variations in manufacturing tolerances, allowing performance consistency to be achieved through assembly adjustments rather than requiring precision manufacturing
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 design achieves a robust and efficient frequency selective damping behavior with a proportional closing force over time, reducing the impact of manufacturing tolerances and maintaining performance across multiple damping cycles.
Implementation Method 1
an increase of a fluid pressure in the control chamber acting to increase the volume of the control chamber so as to move the movable valve body, thereby increasing a closing force of the controlled valve
Implementation Method 2
the control chamber inlet comprising a flow restriction for a control fluid flow from the valve inlet side to the control chamber
Implementation Method 3
allowing a relief fluid flow from the control chamber to the valve inlet side bypassing the flow restriction of the control chamber inlet
Data Source
AI summary
A damper valve (100) comprises a controlled flow channel (115) between a valve inlet side (100.1) and a valve outlet side (100.2); a controlled valve (130) provided in the controlled flow channel; a movable valve body (120) acting on the controlled valve so as to change a closing force of the controlled valve; and a control chamber (126). The control chamber comprises a control chamber inlet (125) in fluid connection with the valve inlet side (100.1) upstream of the controlled valve (130); a configuration providing a variable volume of the control chamber, a change in volume of the control chamber acting to cause a movement of the movable valve body (120); and a pressure relief valve (160) to allow a relief fluid flow from the control chamber (126) to the valve inlet side (100.1) bypassing the flow restriction (160.1) of the control chamber inlet (125).