Eccentric Pump with Deformable Seal for Urea Dosing
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Solution Overview
Problem
Pumps used for delivering urea-water solutions for SCR processes in motor vehicles face issues such as freezing at low temperatures, crystalline urea deposits, and inefficiencies in dosing accuracy and mechanical energy consumption, which can lead to pump damage and operational inaccuracies.
Innovation Solution
A pump design featuring an eccentric movement within a pump housing with a deformable element and a structured surface on the outer face of the eccentric, forming a displaceable seal and closed pump volumes, which reduces friction and energy consumption while maintaining precise dosing and preventing backflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pump is designed to deliver urea-water solution, then dosing accuracy is improved, but mechanical energy consumption increases due to diaphragm deformation
Solution Approach 1:
The patent replaces the traditional diaphragm deformation mechanism with a magnetic field-based actuation system. Magnets arranged on the piston surface generate magnetic forces that directly move the piston, eliminating the need for mechanical diaphragm deformation and significantly reducing mechanical energy consumption while maintaining precise dosing control
Solution Approach 2:
The patent changes the physical state and properties of the pump components by using magnetic fields instead of mechanical forces. The magnetic field strength and distribution are adjusted to achieve precise piston movement and dosing accuracy without the energy losses associated with traditional mechanical deformation
2Use of energy by moving object
If a pump operates with high mechanical efficiency, then energy consumption is reduced, but dosing accuracy may deteriorate
Solution Approach 1:
The magnetic field actuation system provides precise control over piston movement without the mechanical losses inherent in traditional systems. The magnetic forces can be precisely modulated to achieve accurate dosing while maintaining high energy efficiency, as magnetic fields do not suffer from friction or mechanical deformation losses
3Reliability
If a pump is designed to withstand freezing liquid expansion, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent employs a flexible membrane that can expand and contract to accommodate volume changes in the liquid, including expansion during freezing. This flexible barrier protects the rigid pump structure from damage while maintaining system integrity, avoiding the need for complex expansion chambers or relief mechanisms
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 pump effectively delivers urea-water solutions at low temperatures with improved dosing accuracy and reduced mechanical energy consumption, preventing damage from freezing and maintaining precise liquid delivery to exhaust-gas treatment devices.
Implementation Method 1
an eccentric which is movable in eccentric fashion relative to the pump housing about the geometric axis
Data Source
AI summary
Pump for conveying liquid, having at least one pump housing with at least one inlet and at least one outlet, and including an inner circumferential surface and a geometric axis, where an eccentric is arranged within the pump housing and is moveable eccentrically relative to the pump housing around the geometric axis. A deformable element is arranged in a pump gap between the inner circumferential surface of the pump housing and an outer surface of the eccentric. The deformable element is pressed against the pump housing by the outer surface of the eccentric along at least one section of a conveying channel such that at least one displaceable seal of the conveying channel and at least one closed pump volume are formed in the conveying channel which are displaceable by an eccentric movement of the eccentric for conveying the fluid along the conveying channel from the inlet to the outlet.