Lever-Driven Reversing Valve for Compact Grease Pumping
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Solution Overview
Problem
Current grease pumping devices are bulky and prone to burnout due to high reversing resistance from electromagnetic reversing valves, and their complex hydraulic structures occupy excessive space.
Innovation Solution
A compact grease pumping device utilizing a mechanical reversing valve with a lever mechanism and toggle member, where the output rotating shaft drives the toggle member to toggle the lever mechanism, switching the valve core between positions, reducing power consumption and costs while avoiding external valve configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electromagnetic reversing valves are used in grease pumping devices, then the valve can switch between pressurization and pressure relief phases, but the reversing resistance is large causing the valve to be prone to burnout
Solution Approach 1:
The patent replaces the electromagnetic reversing valve with a mechanical reversing valve driven by a reversing cam and follower mechanism. The cam is rotated by the driving mechanism to directly actuate the valve core through mechanical contact, eliminating the need for electromagnetic actuation. This mechanical substitution reduces power consumption and avoids the burnout issues associated with electromagnetic valves while maintaining reliable switching between pressurization and pressure relief phases.
2Reliability
If hydraulically controlled reversing valves are used, then the valve can function properly, but the structure is too complex and has relatively large volume
Solution Approach 1:
The patent employs a mechanically actuated reversing valve where a reversing cam, driven by the main driving mechanism, directly controls the valve core position through a follower. This eliminates the need for complex hydraulic control systems while maintaining reliable valve function. The mechanical linkage provides simple, direct control with fewer moving parts and reduced structural complexity compared to hydraulic control approaches.
3Ease of manufacture
If external reversing valves are configured, then the valve can be installed separately, but the overall structure occupies more space and is less compact
Solution Approach 1:
The patent integrates the reversing valve directly into the pump body structure, combining the valve assembly with the pumping mechanism. The reversing cam, valve core, and pump components are arranged in a compact integrated unit, eliminating the need for separate external valve installations. This merging of components reduces the overall device volume while maintaining installation flexibility through modular internal design.
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 mechanical reversing valve structure is more reliable, compact, and energy-efficient, reducing space occupation and eliminating the inconvenience of external valve configurations, enhancing the overall performance of the grease pumping device.
Implementation Method 1
At least one of the lever mechanism and the toggle member is an elastic structure, when the output rotating shaft rotates in the forward direction or the reverse direction, the toggle member contacts the lever mechanism and drives the valve core to operate, and when the valve core is switched to a corresponding valve position, the toggle member and the lever mechanism slide relatively by the elastic deformation of the elastic structure.
Data Source
AI summary
A grease pumping device includes a pump body, a driving mechanism, a plunger pair, a reversing valve and a lever mechanism. A switching action between each valve position of a valve core of the reversing valve is driven by the lever mechanism. An output rotating shaft drives a toggle member rotating therewith, and when the output rotating shaft rotates reciprocally in forward and reverse directions, the toggle member toggles the lever mechanism in the forward and reverse directions, such that the lever mechanism swings reciprocally. At least one of the lever mechanism and the toggle member is an elastic structure, when the output rotating shaft rotates, the toggle member contacts the lever mechanism and drives the valve core to operate, when the valve core is switched to a corresponding valve position, the toggle member and the lever mechanism slide relatively by elastic deformation of the elastic structure.