Oil Return Mechanism for Hydraulic Jacks
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Solution Overview
Problem
Conventional oil return mechanisms in jacks are costly due to the need for expensive speed regulating devices to control fluid flow, which can lead to accidents during rapid load descent.
Innovation Solution
An oil return mechanism with a base, control switch, first blocking ball, and elastic member that regulates fluid flow by moving between blocking and open positions, creating liquid guiding gaps to control the speed of fluid flow from the liquid returning cavity to the communicating cavity, thereby reducing costs and preventing accidents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional oil return mechanism uses a control switch to regulate fluid flow speed, then the jack descending speed can be controlled, but the device complexity and manufacturing cost increase significantly
Solution Approach 1:
The patent replaces expensive speed regulating devices with inexpensive blocking balls that can be easily manufactured and replaced. The blocking balls serve as simple, low-cost flow control elements that achieve the same safety function without the complexity of conventional speed regulating mechanisms.
Solution Approach 2:
The blocking balls automatically regulate fluid flow based on hydraulic pressure differences without requiring external control systems. The system self-adjusts flow speed through the blocking balls' positioning driven by pressure differential, eliminating the need for complex electronic or mechanical control devices.
2Productivity
If the control switch is fully open to allow rapid fluid flow, then the jack operates efficiently under load, but the jack descends too rapidly under no load condition causing safety accidents
Solution Approach 1:
The blocking balls dynamically adjust their position based on real-time hydraulic pressure conditions. Under load, higher pressure pushes the blocking balls to allow rapid flow for efficiency; under no load, lower pressure allows the blocking balls to partially block flow, reducing descent speed for safety. This dynamic adaptation resolves the contradiction between efficiency and safety.
Solution Approach 2:
The system changes the flow resistance parameter automatically based on operating conditions. The blocking balls modify the effective flow area and resistance dynamically, transitioning between different flow regimes to maintain both productivity and safety across varying load conditions.
3Reliability
If a speed regulating device is added to control fluid flow speed, then safety accidents are prevented, but the manufacturing cost increases significantly
Solution Approach 1:
The patent uses inexpensive blocking balls made from simple materials instead of costly speed regulating devices. These blocking balls are easy to manufacture, install, and replace, dramatically reducing manufacturing costs while maintaining safety functionality through passive flow restriction.
4Reliability
If the first blocking ball is positioned to create liquid guiding gaps, then fluid flow speed is reduced for safety, but the flow path becomes more complex
Solution Approach 1:
The liquid guiding gaps create localized flow channels with specific geometric characteristics between the blocking ball and cavity wall. This local modification of flow path geometry provides speed control without requiring complex overall flow path design, maintaining simplicity while achieving the desired flow regulation.
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 mechanism effectively regulates fluid flow speed, ensuring safe jack operation by slowing down the jack under load conditions while maintaining a simple structure and reducing manufacturing costs, with the added benefit of avoiding clogging through strategically designed liquid guiding gaps.
Implementation Method 1
an elastic member (3) mounted between the first blocking ball (2) and the base (1)... the elastic force generated by the elastic member (3) acts on the first blocking ball (2) from the blocking position to the open position
Implementation Method 2
The first blocking ball (2) moves between the blocking position and the open position under the cooperative control of an elastic force of the elastic member (3) and a hydraulic pressure of the liquid in the liquid returning cavity (12)
Data Source
AI summary
An oil return mechanism includes a base, a control switch, a first blocking ball mounted in the base, an elastic member mounted between the first blocking ball and the base. The base has a liquid storing cavity, a liquid returning cavity, a communicating cavity, a first communicating opening communicating between the liquid returning cavity and the communicating cavity, and a second communicating opening communicating between the communicating cavity and the liquid storing cavity. The present invention can regulate a speed of a fluid flowing from the liquid returning cavity to the communicating cavity, and has the advantages of simple structure and great reduction of cost.