Hydraulic Valve Circuit With Branched Return Flow Stabilization
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Solution Overview
Problem
Existing hydraulic systems for working machines face inefficiencies in fluid management, particularly in the control and return of operation fluid between control valves, leading to reduced performance and fluid supply issues during actuator operations.
Innovation Solution
The hydraulic system incorporates a series circuit configuration with a pressurizing portion, branched fluid tubes, and check valves to manage the flow of operation fluid and return fluid between control valves, ensuring efficient fluid supply and pressure management across the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If operation fluid is discharged from the control valve to the discharge fluid tube, then the control valve can reset properly, but the fluid flow rate becomes insufficient during actuator operations
Solution Approach 1:
The patent introduces a branched fluid tube as an intermediary pathway that connects the discharge fluid tube to the external fluid tube. This mediator allows operation fluid to be supplied to the actuator through an alternative route, resolving the contradiction between proper control valve resetting and sufficient fluid flow rate during actuator operations.
Solution Approach 2:
The patent segments the fluid discharge pathway into multiple routes: the main discharge fluid tube for control valve resetting and the branched fluid tube for actuator fluid supply. This segmentation allows the system to simultaneously achieve proper control valve operation and sufficient actuator fluid flow rate by directing fluid through different pathways based on operational needs.
2Device complexity
If return fluid flows directly from the return fluid tube to the discharge fluid tube, then the system is simple, but pressure fluctuations occur during actuator operations
Solution Approach 1:
The external fluid tube serves as an intermediary that receives operation fluid from the branched fluid tube and supplies it to the actuator. This intermediary pathway stabilizes pressure by providing a controlled alternative route for fluid flow, preventing direct pressure fluctuations that would occur with simple direct connection.
Solution Approach 2:
The system prepares for pressure stabilization by establishing the branched fluid tube and external fluid tube pathways in advance. These pre-configured pathways ensure that when pressure fluctuations occur during actuator operations, the fluid can be redirected through the stabilized external fluid tube route.
3Device complexity
If the hydraulic system uses a conventional fluid management configuration, then the system is simple, but fluid supply efficiency to actuators is reduced
Solution Approach 1:
The patent segments the fluid supply system into multiple dedicated pathways: the external fluid tube for actuator supply, the branched fluid tube for pressure management, and the discharge fluid tube for control valve resetting. This segmentation significantly improves fluid supply efficiency to actuators while maintaining reasonable system complexity through modular design.
Solution Approach 2:
The patent adds a dimensional aspect to fluid management by creating a branched configuration that operates in parallel with the main discharge pathway. This dimensional expansion allows simultaneous fluid supply to actuators and proper control valve resetting without interfering with each other, thereby improving overall fluid supply efficiency.
Data Source
AI summary
A hydraulic system includes a hydraulic pump, a first hydraulic actuator, a second hydraulic actuator, a first control valve to control the first hydraulic actuator, a second control valve connected to a downstream side of the first control valve and configured to control the second hydraulic actuator, a return fluid tube in which return fluid discharged from the first hydraulic actuator flows, the return fluid tube coupling the first control valve and the first hydraulic actuator, an internal fluid tube arranged in the first control valve and connected to the return fluid tube, an external fluid tube connected to the internal fluid tube, the external fluid tube coupling the first control valve and the second control valve, a branched fluid tube branched from the external fluid tube and connected to a discharge fluid tube, and a pressurizing portion provided to the discharge fluid tube.