High-Pressure Water Pump With Eccentric Hydrodynamic Lubrication
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Solution Overview
Problem
Existing water-lubricated high-pressure water pumps are prone to damage from pollutants and have limited pressure output due to high structural complexity and water lubricity issues.
Innovation Solution
A high-pressure water pump design utilizing a driving mechanism with eccentric and thrust structures that generate hydrodynamic pressure lubrication, reducing friction through rolling contact and eliminating the need for hydrostatic support, combined with anti-friction layers and controlled gaps to enhance lubrication and prevent wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydrostatic support is adopted to reduce friction, then lubrication is improved, but structural complexity increases and the system becomes sensitive to pollutants
Solution Approach 1:
The patent replaces the hydrostatic support system with a pure mechanical friction pair consisting of an eccentric structure and a thrust structure. The eccentric structure rotates directly against the thrust structure to generate hydrodynamic pressure for lubrication, eliminating the need for complex hydrostatic support mechanisms and their associated pollution sensitivity.
Solution Approach 2:
The patent utilizes hydrodynamic lubrication where water or aqueous solution enters the friction pair and generates pressure through the relative motion between the eccentric and thrust structures. This hydraulic approach provides lubrication without requiring complex mechanical support systems.
2Object-generated harmful factors
If water is used as lubricant for environmental protection, then ecological impact is reduced, but lubricity is insufficient for traditional materials
Solution Approach 1:
The patent changes the surface properties of the friction pair by introducing anti-friction layers on the eccentric and thrust structures. This modifies the friction characteristics to enable water lubrication to achieve sufficient lubricity for high-pressure operation without compromising environmental protection.
Solution Approach 2:
The patent employs composite material structures with anti-friction layers applied to the eccentric and thrust structures. These specialized surface materials provide the necessary friction characteristics for water-lubricated operation while maintaining the environmental benefits of using water instead of oil.
3Reliability
If traditional reciprocating pump design is used with lubricating oil, then lubrication is adequate, but oil replacement is required regularly and pollution occurs
Solution Approach 1:
The patent substitutes the lubricating oil system with a water-lubricated mechanical system. The friction pair between the eccentric and thrust structures is designed to operate with water or aqueous solution, eliminating oil pollution while maintaining adequate lubrication through hydrodynamic pressure generation.
Solution Approach 2:
The patent uses hydraulic lubrication where water enters the friction pair and generates sufficient pressure through the relative motion of the eccentric and thrust structures. This hydraulic approach provides continuous lubrication without the need for periodic oil replacement and without environmental pollution.
4Object-generated harmful factors
If water-lubricated axial plunger pump is adopted for environmental protection, then efficiency is improved, but pressure output is limited to 16MPa
Solution Approach 1:
The patent replaces the water-lubricated axial plunger pump design with an eccentric-driven mechanism. The rotating eccentric structure directly drives the plunger through a thrust structure, creating more efficient force transmission and enabling higher pressure output while maintaining water lubrication for environmental protection.
Solution Approach 2:
The patent changes the mechanical configuration from axial plunger to eccentric-driven reciprocating motion. This parameter change in the driving mechanism enables higher pressure generation capability while maintaining the water-lubricated environmental advantage.
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 design achieves higher pressure output and volumetric efficiency while improving anti-pollution capabilities and simplifying maintenance, with pressure outputs exceeding 30 MPa without lubricating oil.
Implementation Method 1
the water or the aqueous solution enters into the first sliding friction pair in the shell. When the eccentric structure is rotated, the thrust structure abuts against a contact surface of the plunger and rolls on the contact surface
Implementation Method 2
the thrust structure abuts against a contact surface of the plunger and rolls on the contact surface, to push the plunger to move in the plunger cavity to pressurize the water or the aqueous solution
Implementation Method 3
The plunger moves in the plunger cavity under a rebound force of the rebound structure to suck in the water or the aqueous solution
Data Source
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AI summary
The present invention discloses a high-pressure water pump lubricated by water or aqueous solution which relates to the field of high-pressure water pump technologies, including a driving mechanism, a shell, a rebound structure and at least one plunger and a plunger cavity. The driving mechanism includes a main shaft and at least one eccentric structure arranged on the main shaft, a thrust structure is sleeved on an outer side of each eccentric structure, the thrust structure and the eccentric structure are rotated relative to each other, and the thrust structure and the eccentric structure constitute a first sliding friction pair. The eccentric structure and the thrust structure are located in the shell, and a space in the shell in which the eccentric structure and the thrust structure are located is used to fill with water or aqueous solution simultaneously, and the water or the aqueous solution enters into the first sliding friction pair in the shell. When the eccentric structure is rotated, the thrust structure pushes the plunger to move in the plunger cavity to pressurize the water or the aqueous solution. The plunger moves in the plunger cavity under a rebound force of the rebound structure to suck in the water or the aqueous solution. The present invention has a high output pressure and good anti-pollution ability.