Hydraulic Distributor Inlet Section for Stand-By Pressure Margin Control
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Solution Overview
Problem
Existing hydraulic distributor systems face energy loss and thermal dissipation issues in stand-by conditions due to high pressure margins, and require complex structural changes to manage pressure compensation, limiting energy efficiency and control flexibility.
Innovation Solution
An inlet section with a valve body, slider, and control device that allows for a controlled reduction of pressure margin by using a mechanical thrust mechanism and control spring to manage fluid flow between high and low pressure lines, enabling efficient energy balance and flexible control strategies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a fixed displacement pump configuration is used in stand-by conditions, then the pump delivers full flow, but significant energy loss and thermal dissipation occur due to high pressure margin
Solution Approach 1:
The invention applies dynamics by making the pressure margin adjustable rather than fixed. The control device modifies the spring preload on the discharge compensator based on operating conditions (stand-by vs. operation), allowing the system to adapt the pressure margin dynamically. This resolves the contradiction by enabling low pressure margin in stand-by (reducing energy loss) while maintaining high pressure margin during operation (ensuring proper flow compensation), without requiring a completely different system architecture.
Solution Approach 2:
The invention changes the pressure margin parameter dynamically through a control device that adjusts the spring preload on the discharge compensator. In stand-by conditions, the control device reduces the spring preload to lower the pressure margin, minimizing energy loss. During operation, the spring preload is restored to maintain the necessary pressure margin for proper flow compensation. This parameter change approach resolves the contradiction between energy efficiency and system functionality.
2Reliability
If a high pressure margin is maintained in stand-by conditions to ensure proper flow compensation, then system reliability is improved, but energy loss and thermal dissipation increase
Solution Approach 1:
The control device dynamically adjusts the pressure margin based on system state. In stand-by conditions, it reduces the spring preload on the discharge compensator to lower the pressure margin, minimizing energy loss while maintaining sufficient compensation capability. During operation, the pressure margin is restored to ensure reliable flow compensation. This dynamic adjustment resolves the contradiction between reliability and energy efficiency.
Solution Approach 2:
The control device prepares the system for stand-by conditions by preemptively reducing the spring preload on the discharge compensator before full stand-by mode is engaged. This preliminary action ensures that when the system transitions to stand-by, the pressure margin is already optimized for energy efficiency, while the compensator structure remains ready to provide reliable flow compensation when needed.
3Loss of energy
If a second discharging device and pilot valve are added to reduce pressure margin in stand-by conditions, then energy efficiency is improved, but device complexity increases significantly
Solution Approach 1:
The control device is designed to perform multiple functions: it adjusts the spring preload on the discharge compensator to modify the pressure margin, and it can operate in different modes (stand-by and operation) by changing the preload level. This multi-functionality allows the system to reduce energy loss in stand-by conditions without adding separate dedicated components for each function, thereby resolving the contradiction between energy efficiency and complexity.
Solution Approach 2:
The invention merges the pressure margin control function into the existing discharge compensator structure by modifying its spring preload, rather than adding a completely separate control system. The control device integrates with the compensator mechanism, combining multiple control aspects (pressure margin adjustment, flow compensation) into a unified structure, thus reducing overall system complexity while achieving energy efficiency goals.
4Loss of energy
If the spring preload on the discharge compensator is reduced in stand-by conditions, then energy loss is reduced, but control precision over the pressure margin may be compromised
Solution Approach 1:
The control device incorporates feedback mechanisms that monitor system conditions (flow requirements, pressure levels) and automatically adjust the spring preload on the discharge compensator accordingly. This feedback ensures that the pressure margin is precisely controlled at the reduced level during stand-by conditions, maintaining control precision while minimizing energy loss. The feedback loop prevents over-reduction or under-reduction of the pressure margin, resolving the contradiction between energy efficiency and control precision.
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 reduces thermal dissipation and energy loss in stand-by conditions, allows for double-level control of machines, and provides continuous proportional control of pressure margin, while simplifying the system structure and reducing complexity.
Implementation Method 1
said first area being subjected to the action of a first pressure fed by the high pressure line and acting in a direction such as to push the slider towards the second position
Implementation Method 2
said second area being subjected to a second pressure fed by a line for detecting the highest load pressure required by uses placed downstream of the distributor, said second pressure acting in the opposite direction to said first pressure
Implementation Method 3
a main spring active on the second area of the slider in a direction consistent with the action of the second pressure
Implementation Method 4
comprising a mechanical thrust means selectively active on the first area of the slider in a direction consistent with the action of the first pressure so as to force the slider in the second position
Implementation Method 5
said control device further comprising a control spring active on the fourth area opposed to the main spring
Data Source
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AI summary
An inlet section (1) for use in a hydraulic distributor (FS), comprising: a slider (6) longitudinally sliding within a valve body (2) between a first position in which it prevents the passage of fluid from a high pressure line (HP) to a low pressure line (TL), and a second position in which it enables it, with a first area (S1) subjected to the action of a first pressure fed by the high pressure line (HP) and in a direction such as to push the slider (6) towards the second position, and a second area (S2) subjected to a second pressure acting in the opposite direction to the first and fed by a line (LS) for detecting the highest load pressure required downstream; a main spring (11) active on the second area (S2) of the slider (6) in a direction consistent with the action of the second pressure; a control device (4) of the position of the slider (6), comprising a mechanical thrust means (17) selectively active on the slider (6) to force it in the second position and a control spring (27) active thereon opposed to the main spring (11). The control device (4) is configurable in a thrust condition, in which it acts on the first area (S1) of the slider (6) together with the first pressure to force it into the second position thereof, and in a deactivating condition, in which it is distanced and retracted from the first area (S1) of the slider (6).