Oil Return Valve Set With Multi-Stage Throttling for Reset Speed Control
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Solution Overview
Problem
The existing throttling valve structures in oil returning channels of hydraulic instruments have insufficient valve opening allowance, limiting the pressure range and reset speed of hydraulic equipment, such as jacks, and can lead to dangerous situations where high-pressure oil cannot be discharged, preventing the piston rod from being lowered and reset.
Innovation Solution
A multi-stage throttling control system is implemented using a series of throttling valve plugs with different elastic forces, arranged in the oil returning channel, which includes a normally-open draining gap to maintain pressure relief and control the flow of oil, allowing for increased valve opening margin and adjustable reset speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single throttling valve is installed in the oil returning channel, then the structure is simple, but the valve opening allowance is insufficient and the pressure range and reset speed are limited
Solution Approach 1:
The single throttling valve is segmented into multiple throttling valve plugs (first, second, and third) arranged in series within the oil returning channel. Each valve plug has different elastic forces and controls different stages of oil flow, enabling multi-stage throttling control. This segmentation allows independent adjustment of each valve's opening allowance, thereby expanding the overall pressure range and reset speed adjustment capability while maintaining reasonable structural complexity.
2Speed
If the throttling valve opening is reduced to control oil flow, then the reset speed can be adjusted, but the pressure range for lifting heavy objects is limited
Solution Approach 1:
The system transitions from a static single-valve configuration to a dynamic multi-stage throttling system. The multiple valve plugs with different elastic forces create dynamically adjustable flow resistance at different pressure levels. This allows the system to adaptively control oil flow based on loading conditions, enabling both speed adjustment and expanded pressure range without compromising either parameter.
Solution Approach 2:
The invention changes the parameter of valve opening allowance across multiple stages rather than using a single fixed parameter. Each throttling valve plug can be independently adjusted to provide different opening allowances, creating a multi-parameter control system. This enables the system to maintain appropriate oil flow control across a wider pressure range while adjusting reset speed as needed.
3Stress or pressure
If the throttling valve is designed for high pressure control, then the pressure range is improved, but the valve opening allowance for flow adjustment becomes insufficient
Solution Approach 1:
The flow control function is segmented across multiple valve plugs, each responsible for a specific pressure range and flow adjustment task. The first valve plug handles lower pressure ranges with larger opening allowance for maximum flow adjustment, while subsequent valve plugs handle progressively higher pressures. This segmentation ensures that each valve operates within its optimal range, maintaining both pressure control capability and flow adjustment flexibility.
Solution Approach 2:
Each throttling valve plug is designed with local quality - different elastic forces and opening allowances tailored to specific pressure ranges. The first valve plug has larger opening allowance for high-flow scenarios, while subsequent plugs have progressively smaller allowances optimized for their respective pressure ranges. This local optimization ensures that flow adjustment ease is maintained at each stage while achieving overall high-pressure control capability.
4Stress or pressure
If the oil returning channel is completely blocked to control pressure, then the pressure range is maximized, but the piston rod cannot be lowered and reset
Solution Approach 1:
The system performs preliminary action by providing a pre-designed escape channel that is always available but controlled. The multiple valve plugs are configured with progressively smaller opening allowances, creating a staged flow restriction system. Even when all main throttling valves are closed for maximum pressure control, the escape channel provides a fail-safe path for oil return, ensuring the piston rod can always be lowered and reset. This preliminary design prevents complete blockage while maintaining pressure control capability.
Solution Approach 2:
The escape channel acts as a beforehand cushioning measure against complete flow blockage. By designing this alternative path in advance with controlled opening allowances, the system prepares a safety mechanism that prevents the harmful effect of total blockage. The multi-stage valve configuration ensures that even under maximum pressure control conditions, some oil can return through the escape channel, cushioning against the risk of inability to reset and maintaining 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
The multi-stage throttling control system enhances the pressure range for lifting heavy objects and adjusts the reset speed of the piston rod, while maintaining a small flow pressure relief function to prevent dangerous situations, even under heavy oil loads, thereby improving the operational efficiency and safety of hydraulic equipment.
Implementation Method 1
a plurality of throttling valve plugs arranged at an inlet end of the oil returning channel, and controlling the oil in the pressurized oil collecting cavity to flow to the oil returning channel; wherein a plurality of the throttling valve plugs are arranged in series and each load has a different elastic force
Implementation Method 2
a normally-open draining gap is formed in the plurality of throttling valve plugs, and the normally-open draining gap is used for connecting between the pressurized oil collecting cavity and the oil returning channel
Data Source
AI summary
An oil returning valve set with multi-stage throttling control includes an oil returning channel implemented in oil in an oil hydraulic equipment. The two ends of the oil returning channel are connected to a pressurized oil collecting cavity and a pressurized oil discharging cavity respectively. A plurality of throttling valve plugs and oil returning valve plug are arranged in the oil returning channel, and a normally-open draining gap is also formed among the plurality of throttling valve plugs. When the oil returning valve plug is opened, a plurality of the throttling valve plugs are arranged in series to generate multi-stage throttling oil hydraulic draining control, which improves the problem that the valve opening allowance of the throttling valve for oil returning and pressure relief of traditional oil hydraulic equipment is not sufficient.