Hydraulic Warm-Up Circuit With Check Valve Backflow Control
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Solution Overview
Problem
Conventional hydraulic systems in work machines, such as backhoes, face challenges in efficiently managing operation fluid flow and warm-up processes, particularly in switching between operational and warm-up modes, which can lead to inefficiencies and interference with machine operations.
Innovation Solution
The hydraulic system incorporates a dual-position switching unload valve, a traveling switching valve, and a warm-up fluid tube with a check valve, allowing for controlled operation fluid supply and warm-up fluid circulation, enabling efficient operation and warm-up of hydraulic devices while preventing fluid backflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the unload valve switches between supply position and unload position to control operation fluid flow, then the hydraulic device can operate or be warmed up, but fluid may flow in unintended directions causing interference with machine operations
Solution Approach 1:
The check valve acts as an intermediary component in the warm-up fluid tube, mediating the flow direction between the operation fluid tube and control fluid tube. It automatically prevents fluid from flowing from the operation fluid tube toward the control fluid tube, thus resolving the contradiction by ensuring system integrity while maintaining ease of operation mode switching.
2Productivity
If operation fluid is supplied to the operation fluid tube for hydraulic device operation, then the hydraulic device functions properly, but warm-up fluid circulation is interfered with
Solution Approach 1:
The hydraulic system is segmented into separate fluid pathways: the operation fluid tube for device operation and the control fluid tube for warm-up circulation. The check valve creates a clear division that allows operation fluid to flow freely to the hydraulic device while preventing it from entering the warm-up circulation path, thus resolving the contradiction between operational efficiency and warm-up capability.
3Temperature
If the warm-up fluid tube connects the operation fluid tube and control fluid tube for warm-up circulation, then fluid can be warmed up, but operation fluid may flow back and interfere with control
Solution Approach 1:
The check valve serves as a one-way intermediary that permits warm-up fluid circulation from the control fluid tube to the operation fluid tube while blocking any reverse flow. This ensures that the operation fluid can be warmed up effectively without risking backflow that would compromise control fluid integrity and system 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
This configuration allows for seamless switching between operational and warm-up modes, enhancing the efficiency of hydraulic device operation and maintaining system integrity by preventing fluid backflow, thus improving the overall performance and reliability of work machines.
Implementation Method 1
a check valve provided in the warm-up fluid tube and being for allowing the operation fluid to flow from the control fluid tube side toward the operation fluid tube, and for blocking the operation fluid from flowing side from the operation fluid tube toward the control fluid tube
Implementation Method 2
a warmup fluid tube connecting the control fluid tube and the operation fluid tube
Data Source
AI summary
A hydraulic system includes a hydraulic pump, an output fluid tube connected to the hydraulic pump, an operation fluid tube connected to a hydraulic device, an unload valve connected to the output fluid tube, and having: a supply position in which the operation fluid in the output fluid tube is supplied to the operation fluid tube; and a restrain position in which supply of the operation fluid to the operation fluid tube is restrained, an operation valve connected to the output fluid tube, a control fluid tube connecting the operation valve and the hydraulic device, a warmup fluid tube connecting the control fluid tube and the operation fluid tube, and a check valve provided in the warm-up fluid tube and being for allowing the operation fluid to flow from the control fluid tube side toward the operation fluid tube, and for blocking the operation fluid from flowing side from the operation fluid tube toward the control fluid tube.