Multi-Stage Oil Return Valve for Pressure Relief and Reset Speed
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Solution Overview
Problem
The existing throttling valve structures in oil hydraulic equipment, particularly in jacks, have limited valve opening allowance, restricting the pressure range for lifting heavy objects and the reset speed of the piston rod, leading to potential safety hazards when high-pressure oil is loaded.
Innovation Solution
A multi-stage throttling valve system with inner and outer valve plugs, each loaded with different elastic forces, is introduced in the oil returning channel, featuring a normally-open draining gap to maintain pressure relief and control the oil flow, allowing for increased valve opening margin and adjustable reset speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional throttling valve structure is used in the oil returning channel, then the structure is simple, but the valve opening allowance is insufficient, limiting the pressure range and reset speed adjustment
Solution Approach 1:
The single throttling valve is segmented into multiple independent throttling valve plugs (first, second, and third plugs), each capable of independent adjustment. This segmentation increases the valve opening allowance by providing multiple adjustment stages, allowing finer control over the pressure range and reset speed while maintaining a relatively simple overall structure through modular design.
Solution Approach 2:
The throttling valve plugs are arranged in a nested configuration within the oil returning channel, with each subsequent plug positioned inside or adjacent to the previous one. This nesting approach increases the functional capability (valve opening allowance) without proportionally increasing the external dimensions or structural complexity, as the multiple plugs share the same spatial envelope.
2Ease of operation
If a single throttling valve is used, then the structure is simple, but the reset speed adjustment range is limited
Solution Approach 1:
The reset speed control function is segmented across three independent throttling valve plugs, each controlling a different aspect of the oil return flow. This allows operators to adjust the reset speed in multiple stages, providing a broader and more precise adjustment range compared to a single valve, while keeping each individual valve component relatively simple.
Solution Approach 2:
The throttling valve plugs are designed to be adjustable and movable, allowing dynamic modification of the throttle opening during operation. This dynamic adjustability enables the system to adapt to different reset speed requirements, transforming a static single-valve system into a dynamic multi-stage control system that enhances operational flexibility without excessive complexity.
3Force
If high pressure oil is loaded in the pressurized oil collecting cavity, then the lifting capacity is increased, but the throttling valve may become stuck, preventing oil discharge and piston rod reset
Solution Approach 1:
The oil discharge path is segmented into multiple stages controlled by different throttling valve plugs, ensuring that not all pathways are blocked simultaneously. This segmentation provides redundancy, so if one valve becomes stuck due to high pressure, other pathways remain open, maintaining reliable oil discharge and piston rod reset functionality while preserving high lifting capacity.
Solution Approach 2:
The multi-stage throttling valve plugs are designed to prevent complete blockage of the oil return channel even under high pressure conditions. By distributing the throttling function across multiple adjustable plugs with potentially different opening states, the system cushions against the risk of complete valve sticking, ensuring that some oil flow path remains open to prevent dangerous situations where the piston rod cannot be reset.
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 design enhances the pressure range for lifting heavy objects and the reset speed of the piston rod, while maintaining a small flow pressure relief function to prevent safety hazards, even under heavy oil loads, by utilizing the elastic forces of the valve plugs and the normally-open draining gap.
Implementation Method 1
an inner valve plug and an outer valve plug; wherein the outer valve plug is loaded with an elastic force of an outer layer elastic element; wherein the inner valve plug is loaded with an elastic force of an inner layer elastic element
Data Source
Figure 1
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AI summary
The invention provides an oil returning valve set with multi-stage throttling control which comprises an oil returning channel (13) implemented in oil in an oil hydraulic equipment. The two ends of the oil returning channel (13) are connected to a pressurized oil collecting cavity (11) and a pressurized oil discharging cavity (12) respectively. A plurality of throttling valve plugs and oil returning valve plug (30) are arranged in the oil returning channel (13), and a normally-open draining gap (25) is also formed among the plurality of throttling valve plugs. When the oil returning valve plug (30) 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.