Hydraulic Distributor Inlet Section for Stand-By Pressure Margin Control
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Solution Overview
Problem
Existing hydraulic distributor systems with fixed displacement pump configurations experience significant energy loss and thermal dissipation in stand-by conditions, leading to inefficient energy use, particularly in applications where maximum hydraulic performance is not required.
Innovation Solution
An inlet section for hydraulic distributors is designed with a valve body, slider, and control device that allows for a controlled reduction of pressure margin, enabling better energy balance and reduced thermal dissipation by selectively managing the flow between high and low pressure lines through a mechanical actuator and spring system, allowing for fast and slow control configurations and continuous proportional control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure compensator is used to discharge pump flow in stand-by conditions, then the system can maintain LS pressure margin in operating conditions, but energy loss and thermal dissipation increase significantly in stand-by conditions
Solution Approach 1:
The patent applies a dynamic control mechanism where the slider can switch between different positions based on system conditions. In stand-by conditions, the slider moves to a first position that reduces pressure margin and directs flow to a low pressure line, minimizing energy loss. In operating conditions, it transitions to a second position that maintains the pressure margin for proper load sensing operation. This dynamic reconfiguration allows the system to adapt its pressure margin characteristics according to operational needs.
Solution Approach 2:
The invention changes the pressure parameter dynamically by using a slider mechanism that adjusts the pressure margin between stand-by and operating conditions. The slider's position determines whether the system operates with a reduced pressure margin (stand-by) or a maintained pressure margin (operating), allowing optimization of energy efficiency versus pressure control based on real-time system demands.
2Loss of energy
If a second discharging device and pilot valve are added to manage low pressure discharge, then pressure margin can be controlled in stand-by conditions, but device complexity increases significantly
Solution Approach 1:
The patent merges the pressure margin control function directly into the existing slider mechanism of the discharge compensator. Instead of adding a separate pilot valve and control system, the invention integrates the pressure margin adjustment capability into the slider's movement between positions. This integration eliminates the need for additional components while achieving the same pressure control objective.
Solution Approach 2:
The slider mechanism is given multiple functions: it simultaneously performs flow discharge control and pressure margin adjustment. By making the slider universal, the system eliminates the need for dedicated pilot valves or separate control mechanisms, thereby reducing overall device complexity while maintaining the ability to control pressure margin in stand-by conditions.
3Reliability
If pump flow is discharged at high pressure in stand-by conditions, then pressure margin is maintained for operating conditions, but thermal dissipation and energy inefficiency increase
Solution Approach 1:
The system dynamically adjusts pressure discharge pathways based on operational state. In stand-by conditions, the slider directs flow to a low pressure line, reducing thermal dissipation. When operation is required, the slider transitions to maintain high pressure for proper load sensing function. This dynamic switching optimizes thermal efficiency without compromising operational reliability.
Solution Approach 2:
The invention changes the pressure parameter of discharged flow based on system state. In stand-by, the discharged flow operates at low pressure to minimize thermal dissipation. In operating conditions, the system maintains high pressure parameters to ensure adequate pressure margin for load sensing operations. This parameter adaptation resolves the contradiction between thermal efficiency and operational reliability.
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 energy losses and thermal dissipation in stand-by conditions, enabling efficient energy use and flexible control of hydraulic systems, while simplifying the structural complexity of existing solutions.
Implementation Method 1
a first area (S1) subjected to the action of a first pressure (P1) fed by the high pressure line (HP) in a direction such as to push the slider (6) towards the second position
Implementation Method 2
a second area (S2) subjected to the action of a second pressure (P2) fed by a line (LS) for detecting a highest load pressure required by uses placed downstream of the distributor in a direction opposite to that of the first pressure
Implementation Method 3
a main spring (11) active on the second area (S2) of the slider in a direction consistent with that of the second pressure
Implementation Method 4
a control device (4) for the position of the slider (6), comprising a mechanical actuator member (17) selectively active on the first area (S1) of the slider in a direction consistent with that of the first pressure
Data Source
AI summary
An inlet section for use in a hydraulic distributor including a valve body and a slider with a first area and a second area. The inlet section further including said slider being longitudinally slidable within the valve body between a first position in which it prevents passage of fluid from a high pressure line to a low pressure line, and a second position in which it enables passage of fluid. The inlet section further including a main spring active on the second area of the slider in a direction consistent with action of the second pressure and a control device of the slider. The control device of the slider includes a mechanical actuator member selectively active on the slider in a direction consistent with the action of the first pressure on the first area of the slider so as to force the slider in the second position.