Fluid Pump Cam Geometry for Discharge Pulsation
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Solution Overview
Problem
Existing fluid pumps face challenges in reducing pulsation of discharge pressure when mounted on vehicles, particularly when only a single pump is installed, as they struggle to eliminate pulsation effectively due to limitations in discharge amount and mounting space.
Innovation Solution
A fluid pump design featuring three or more volume chambers with moving elements and a cam mechanism that synchronizes the discharge rotation angle across chambers, ensuring that when one chamber reaches the end phase, the next chamber starts, and the discharge amount is balanced to cancel out pressure fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single fluid pump is installed in a vehicle, then mounting space is saved and device complexity is reduced, but pulsation of discharge pressure cannot be effectively eliminated
Solution Approach 1:
The pump is divided into multiple independent working chambers (at least three), each capable of suction and discharge operations. Each chamber operates independently with its own moving element, allowing the discharge amounts from different chambers to overlap and cancel out pulsations while using a single pump unit.
2Object-generated harmful factors
If multiple volume chambers are used with synchronized discharge timing, then pulsation is reduced, but the discharge rotation angle calculation becomes complex
Solution Approach 1:
The invention defines specific parameter relationships for the discharge rotation angle α = (Z/M)×N, where Z is the cam rotation angle for one cycle, M is the number of working chambers, and N is an integer from 2 to M-1. This mathematical parameter relationship ensures that discharge timing is optimized to cancel pulsations while maintaining manageable complexity through standardized calculations.
Data Source
AI summary
A fluid pump includes: three or more volume chambers that suction and discharge a fluid sequentially; moving elements that are respectively provided in the volume chambers, move relative to the volume chamber, and suction and discharge the fluid from and to the volume chamber; a cam that abuts against and drives the moving elements; and a driving section that drives at least one of the moving elements and the cam and relatively rotates the moving elements and the cam to discharge the fluid one time from each of the volume chambers in one cycle of the relative rotation, in which, when suctioning and discharging the fluid, regarding a discharge rotation angle α, α=(Z/M)×N is satisfied, where the number of volume chambers is M and any integer from 2 to (M−1) is N.