Inductive Pump with Nested End Pistons for High Pressure Output
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Solution Overview
Problem
Existing positive displacement inductive pumps face challenges in increasing pressure without altering physical dimensions or reducing magnetic flux loss, and they struggle to handle materials that previous designs cannot manage.
Innovation Solution
The design incorporates a central piston with non-ferromagnetic end pistons and a housing with central bores, allowing for increased pressure or volume without changing the pump's size, and uses non-magnetic bushings for handling harsh chemicals, while minimizing magnetic flux loss by maintaining a magnetic gap between the axial bore and end walls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If the pump's physical dimensions are increased to increase pressure, then the pressure output is improved, but the pump size increases which is not desirable
Solution Approach 1:
The end pistons are nested within the end wall central bores, creating a compact configuration where the displacement chambers are formed inside the housing structure. This allows the pump to generate higher pressures without increasing its external dimensions, as the nested arrangement maximizes the use of internal space for pressure generation.
Solution Approach 2:
The invention introduces end pistons that extend into the end wall central bores, adding a dimensional element along the axial direction. This creates displacement chambers that utilize the end wall thickness, effectively adding another dimension for pressure generation without increasing the pump's radial or axial footprint.
2Device complexity
If continuous bore solenoids are used, then the structure is simple, but magnetic flux is lost considerably
Solution Approach 1:
The magnetic circuit is segmented by introducing end wall central bores that interrupt the continuous bore path. This segmentation creates discrete magnetic pathways through the end walls, preventing magnetic flux from short-circuiting through a continuous ferromagnetic path and thereby reducing magnetic flux loss while maintaining structural simplicity.
3Loss of energy
If the axial bore contacts the end walls, then the magnetic field is short circuited, but maintaining a gap reduces the effective magnetic force
Solution Approach 1:
End pistons made of non-magnetic material serve as intermediaries between the axial bore and the end walls. These end pistons maintain the necessary magnetic gap to prevent field short-circuiting while still allowing the magnetic force to be transmitted effectively to the central piston through the fluid pressure generated in the displacement chambers.
4Ease of manufacture
If standard materials are used, then manufacturing is easier, but harsh chemicals cannot be handled
Solution Approach 1:
The pump employs composite construction with the housing made of ferromagnetic material and the end pistons made of non-magnetic, chemically resistant materials. This composite approach allows the pump to handle harsh chemicals while maintaining ease of manufacture through the use of standard material joining techniques and modular design.
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 configuration allows for adjustable pressure and volume without altering the pump's physical dimensions, reduces magnetic flux loss, and enables the handling of materials that previous pumps cannot manage, enhancing the pump's efficiency and versatility.
Implementation Method 1
First and second inductive coils are disposed in the housing around the axial bore between the end walls and are coaxial with the axial bore. The coils are alternately energized to generate first and second magnetic fields that cause the central piston to reciprocate within the axial bore.
Implementation Method 2
A housing formed of a ferromagnetic material. An axial bore is formed in the housing. First and second end walls are secured to opposite ends of the housing. The end walls are magnetic poles.
Data Source
AI summary
A positive displacement inductive pump includes a central piston formed of a ferromagnetic material having non-ferromagnetic end pistons that extend from each of its opposite ends. Stationary end walls are mounted to opposite ends of a housing and are centrally bored. First and second inductive coils are alternately energized, causing the central piston and the end pistons to conjointly reciprocate within an axial bore and the end wall central bores, respectively. First and second check valves are positioned outboard of each end wall and allow valve-controlled ingress and egress of material into and out of the axial and central bores. The relative diameters of the central piston and the end pistons are changed to control the relationship between the magnetic force applied and the output pressure for a given volume of fluid.