Hydraulic Control Valve Selection Device
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Solution Overview
Problem
Existing hydraulic control systems require significant energy to maintain high inlet pressures for load management, especially when transitioning from negative to positive loads, and often necessitate system pressure changes to switch between pressure control and flow control modes, which is energetically unfavourable and operationally cumbersome.
Innovation Solution
A hydraulic control system that uses a selection device to optionally supply either pressure control or flow control pressure to the compensation valve, allowing for automatic switching between operation modes based on pressure conditions, thereby optimizing energy consumption and simplifying operation by maintaining a set position for the actuating element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If the control valve is opened relatively much to generate high inlet pressure for lowering the motor under load, then the required pressure is achieved, but the energy consumption increases significantly
Solution Approach 1:
The invention changes the control parameter from pressure-based control to flow-based control. By controlling the flow rate through the control valve rather than maintaining high pressure, the system achieves the same motor lowering function with significantly reduced energy consumption. The compensation valve is replaced by a flow control device that directly regulates the flow rate to the motor.
2Adaptability or versatility
If the system pressure is changed to switch between pressure control and flow control modes, then the operation mode is switched, but the system requires manual intervention and pressure changes
Solution Approach 1:
The system performs self-service by automatically selecting the appropriate control mode based on the operating conditions. The control device monitors the system state and autonomously switches between pressure control and flow control modes without requiring manual intervention. This is achieved through integrated sensing and control logic that adapts the control strategy to the current operational requirements.
3Stress or pressure
If a slide movement is required to control high pressure in the control valve, then the pressure control is achieved, but the actuating element requires significant movement which is energetically unfavourable
Solution Approach 1:
The invention replaces the mechanical pressure control system with a flow control system. Instead of using a large slide movement in a pressure control valve to generate high pressure, the system uses a flow control device that directly regulates the flow rate to the motor. This substitution eliminates the need for large mechanical movements and the associated energy losses.
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
This solution enables efficient energy use by automatically selecting the most favourable pressure mode, reducing the need for manual system alterations and minimizing energy expenditure, especially during load transitions, while ensuring the consumer receives only the necessary pressure for operation.
Implementation Method 1
In the opening direction, the compensation valve is acted upon by a spring and a pressure
Implementation Method 2
The fixed throttle is part of a pressure divider between the outlet of the compensation valve and the low-pressure connection
Implementation Method 3
under the influence of a spring, the load-retaining valve adjusts so that it does not open until the pressure difference has overcome the spring force
Data Source
AI summary
The invention concerns a hydraulic control (1) with a supply connection arrangement (7) having a high-pressure connection (P) and a low-pressure connection (T), a working connection arrangement having two working connections (A, B) connectable with a consumer, a control valve (8) with a valve element (9) between the supply connection arrangement and the working connection arrangement and a compensation valve (11), which is located between the high-pressure connection (P) and the control valve (8) and is acted upon in the closing direction by a pressure between the compensation valve (11) and the control valve (8).It is endeavoured to ensure the most favourable energy consumption possible.For this purpose, in the opening direction the compensation valve (11) is acted upon by a pressure of a selection device (29, 30, 30′, 38), which optionally supplies the compensation valve (11) with a pressure control pressure or a flow control pressure.