Hydraulic Flushing Circuit with Orifice Flow Tuning
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Solution Overview
Problem
The existing hydraulic drive systems require significant labor and time to adjust the cooling ability of the flushing circuit, leading to pulsation and vibration issues due to the complex nature of the relief valve system.
Innovation Solution
A fluid pressure drive device with a low pressure selection valve and a flushing passage featuring a first orifice and a bent portion, allowing for easy adjustment of the flushing flow rate by replacing the orifice, which reduces negative pressure and stabilizes the cooling ability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a relief valve is used to adjust the cooling ability of the flushing circuit, then the cooling ability can be adjusted, but the number of parts increases and adjustment requires much labor
Solution Approach 1:
The patent extracts the adjustment function from the complex relief valve system and implements it through a simple orifice replacement mechanism. The orifice is a separate, easily replaceable component that controls the flushing flow rate, eliminating the need for complex relief valve adjustments while maintaining cooling ability control.
Solution Approach 2:
The orifice is designed as a simple, inexpensive component that can be easily replaced rather than adjusted. This disposable-like approach to flow control simplifies the overall system complexity while maintaining ease of operation for adjusting cooling ability.
2Ease of operation
If a relief valve is used to control flushing flow, then cooling ability can be adjusted, but pulsation occurs in flushing flow rate and vibration occurs in pipe
Solution Approach 1:
The patent removes the relief valve from the flushing circuit and replaces it with a simple orifice that provides stable flow control. This extraction of the problematic component eliminates the source of pulsation and vibration while maintaining the ability to adjust cooling capacity through orifice replacement.
Solution Approach 2:
The orifice provides a simplified copy of the flow control function that the relief valve attempted to provide, but without the harmful side effects. The orifice creates a stable pressure drop that ensures consistent flushing flow rate without the pulsation issues associated with relief valve operation.
3Adaptability or versatility
If the flushing circuit uses a relief valve with many parts, then cooling ability can be controlled, but adjustment requires much labor and time
Solution Approach 1:
The patent extracts the essential flow control function from the complex relief valve assembly and implements it through a simple orifice that can be quickly replaced. This reduces adjustment time significantly while maintaining the ability to adapt cooling ability to different operating conditions.
Solution Approach 2:
The orifice is designed as a simple, inexpensive component that can be quickly swapped out rather than adjusted. This approach trades the complexity and time-consuming adjustment of a relief valve for a simple replacement operation, reducing maintenance time and improving adaptability.
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 enables easy adjustment of the flushing flow rate, suppresses pulsation, and prevents pipe vibration, thereby simplifying the cooling ability adjustment and stabilizing the flushing circuit's performance.
Implementation Method 1
a low pressure selection valve provided between the pair of main passages and configured to be switched by a pressure difference between the pair of main passages
Implementation Method 2
When the working oil passes through the relief valve, due to generation of negative pressure on the downstream side of the relief valve, pulsation occurs in a flushing flow rate
Data Source
AI summary
A fluid pressure drive device includes a flushing circuit configured to discharge a working fluid from one of the pair of main passages to a tank. The flushing circuit has a low pressure selection valve provided between the pair of main passages and configured to be switched by a pressure difference between the pair of main passages, the low pressure selection valve being configured to select the main passage on the low pressure side; and a flushing passage configured to lead the working fluid passing through the low pressure selection valve to the tank. The flushing passage has a first orifice and a bent portion formed on the downstream side of the first orifice.