Fuel Metering Pump Piston Damping via Peripheral Outlet
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Solution Overview
Problem
Existing metering pumps for vehicle heaters face challenges in achieving improved movement damping behavior for the pump piston, leading to potential impact noise during the delivery stroke.
Innovation Solution
The metering pump design features outlet openings in the peripheral wall, at a distance from the bottom wall, creating a blind hole-like volume area that prevents direct contact between the pump piston and the bottom wall, utilizing the enclosed medium for damping and deceleration without additional damping elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the pump piston is allowed to contact the bottom wall directly, then the structure is simpler, but impact noise occurs during the delivery stroke
Solution Approach 1:
The patent introduces an intermediary mechanism - the blind hole volume filled with medium - between the pump piston and the bottom wall. This intermediary cushion of compressed medium absorbs the impact energy during the delivery stroke, preventing direct contact between the piston and bottom wall, thereby eliminating impact noise while maintaining structural simplicity.
2Object-affected harmful factors
If additional damping elements are added to reduce impact noise, then impact noise is reduced, but device complexity increases
Solution Approach 1:
The patent employs the self-service principle by utilizing the medium already present in the pump chamber. The medium serves dual purposes: it is the substance being pumped and simultaneously acts as a damping agent. The blind hole volume allows this medium to compress and cushion the pump piston during delivery, eliminating the need for separate damping elements and maintaining structural simplicity.
3Productivity
If the outlet opening is positioned close to the bottom wall, then the flow path is shorter, but throttling effects increase
Solution Approach 1:
The patent positions the outlet opening in the peripheral wall rather than in the bottom wall, utilizing a different spatial dimension. This peripheral positioning creates a more favorable flow geometry that reduces throttling effects while maintaining an efficient flow path, optimizing both productivity and energy efficiency.
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
This design effectively reduces impact noise and provides a gentle deceleration of the pump piston, ensuring a shock-free operation without the need for additional damping elements, while minimizing throttling effects during medium flow.
Implementation Method 1
the part of the medium to be pumped that is enclosed in this blind hole-like volume area due to the fact that it can no longer escape from this volume area is increasingly compressed
Implementation Method 2
The pump piston 12 is moved by the magnetic interaction of the armature 14 firmly connected to it and an electromagnetic coil 38
Implementation Method 3
when the excitation is terminated, a biasing spring 40, which acts between the armature 14 and the first housing part 18, moves the armature 14 and thus also the piston 12 in the opposite direction
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The pump has a pump piston (12) movable in a housing (16), where the housing provides a pump chamber (26). The housing has a peripheral wall (20) that guides the pump piston, and a bottom wall (24). An inlet flow area (28) discharges into the pump chamber over an inlet opening, and an outlet-flow area led away from the pump chamber over an outlet opening (34). The outlet opening is provided in the peripheral wall at a distance to the bottom wall.