Magnetically Actuated Pump Piston With Annular Inlet Valve Control
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Solution Overview
Problem
Existing pump devices for providing fluids under predeterminable pressure, such as those used in SCR systems for exhaust gas treatment, are limited by their ability to transport only small amounts of fluid at high cycle rates, and they require conventional drivable hydraulic pumps, which can be inefficient and prone to damage from freezing fluids.
Innovation Solution
A pump device with an annular valve piston and pressure reporting surface, controlled by a pump piston and actuating magnet device, allows for pressure-controlled fluid path management, enabling efficient suction and delivery strokes to handle high cycle rates and prevent fluid damage, with a design that includes a compression spring for energy storage and a magnet armature for rapid actuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional drivable hydraulic pumps are used, then the pump can operate with simple structure, but the pump requires additional drive mechanisms and is prone to damage from freezing fluids
Solution Approach 1:
The patent replaces the conventional mechanical drive system (hydraulic pump with motor) with a magnetic actuation system. The pump piston is directly actuated by a magnet, eliminating the need for complex drive mechanisms, belts, or gears that could fail or be damaged by freezing fluids.
Solution Approach 2:
The pump design allows the pump piston to be directly actuated by magnetic force without requiring an external drive mechanism. The system serves itself by using the magnetic field to directly move the piston, eliminating separate drive components that could be damaged by freezing conditions.
2Productivity
If high cycle rates are used, then the pump can deliver fluid quickly, but the pump can only transport small quantities of fluid
Solution Approach 1:
The patent transitions from a single-acting pump to a double-acting pump design where fluid is delivered during both the forward and return strokes of the piston. This effectively doubles the fluid transport volume per cycle while maintaining high cycle rates, resolving the contradiction between speed and volume.
Solution Approach 2:
The pump utilizes periodic magnetic actuation to drive the piston through repeated cycles of forward and return strokes. Each cycle delivers fluid in both directions, maximizing the utilization of every motion cycle to increase overall fluid transport volume while maintaining high frequency operation.
3Adaptability or versatility
If aqueous urea solution is used in freezing conditions, then the pump can function in cold environments, but the fluid can freeze and damage pump parts
Solution Approach 1:
The patent incorporates a compensation device that anticipates and counteracts the harmful effects of freezing. The device compensates for volume expansion when urea solution freezes, preventing damage to pump components while allowing the pump to operate in cold environments with freezeable fluids.
Solution Approach 2:
The compensation device applies a counteracting force against the expansion pressure generated when the urea solution freezes. By providing this preliminary anti-action, the system prevents the freezing fluid from damaging pump parts while maintaining operational capability in cold conditions.
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 solution enables reliable, space-saving, and cost-effective operation with high fluid transport capacity at high cycle rates, while preventing fluid damage and ensuring functional reliability, even under frosty conditions.
Implementation Method 1
A pump device with a pump piston (12) arranged to be longitudinally movable in a pump housing (10), which is controlled by an actuating magnetic device (14)
Implementation Method 2
the valve piston has a pressure sensing surface that is actuated by the pump piston such that, during the intake stroke, the pressure sensing surface of the valve piston moves in the direction of travel of the pump piston against the action of an energy storage device
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a pump device comprising a pump piston (12) which is longitudinally movable in a pump housing (10) and which, controlled by a magnetic actuation apparatus (14), acts on an inlet valve (16) and an outlet valve (18), the inlet valve (16) opening during the intake stroke of the pump piston (12), and the outlet valve (18) opening during the delivery stroke thereof. The inlet valve (16) has an annular valve piston (20) which encompasses the pump housing (10) which has an entry point (22) and an exit point (24) for fluid. The valve piston (20) has a pressure-sensing surface (26) which is controlled by the pump piston (12) in such a way that, during the intake stroke, the pressure-sensing surface (26) of the valve piston (20) is moved counter to the action of an energy store (28) in the movement direction of the pump piston (12) and in the process vacates a fluid path into a pump chamber (30) of the pump housing (10) by means of the pump piston (12) and, during the delivery stroke, the valve piston (20) of the inlet valve (16), under the action of the energy store (28) and the pressure-sensing surface (26), blocks this fluid path and opens the outlet valve (18).