Pressure Multiplier Control Using Magnetic Piston Sensing
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Solution Overview
Problem
Mechanical pressure multipliers suffer from issues such as stall due to friction, require specific installation positions, and need mechanical limit switches, while electronic multipliers lack a simplified structure.
Innovation Solution
A pressure multiplier with an electrically actuated spool valve and magnetic field sensors is used to control piston movement without mechanical contact, utilizing an electronic control unit to manage piston oscillation based on compression curves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If mechanical limit switches are used to control piston oscillation, then the device structure is simple, but stall occurs due to friction preventing piston engagement with limit switches
Solution Approach 1:
The patent replaces mechanical limit switches with magnetic field sensors that detect the position of magnets mounted on the pistons. This substitution eliminates mechanical contact and friction between the switching mechanism and pistons, preventing stall while maintaining reliable detection of piston positions for controlling the compression cycle.
Solution Approach 2:
The patent introduces magnets as intermediaries between the pistons and the magnetic field sensors. The magnets mounted on the pistons create magnetic fields that are detected by the sensors, enabling non-contact position detection and eliminating the need for direct mechanical interaction between limit switches and moving parts.
2Area of stationary object
If mechanical limit switches are positioned inside the cylinder, then the switching mechanism is compact, but friction prevents reliable operation at certain installation positions
Solution Approach 1:
The patent replaces internal mechanical limit switches with external magnetic field sensors positioned on the outer wall of the cylinder. This allows the sensors to detect piston positions without being constrained by internal space limitations, enabling flexible installation positions and eliminating friction-related operational issues.
3Reliability
If magnetic field sensors and magnets are used for non-contact switching, then stall is eliminated, but the device structure becomes more complex
Solution Approach 1:
The patent integrates the magnetic field sensors into the external wall structure of the cylinder, allowing them to serve both as position detection elements and as structural components. The magnets mounted on the pistons serve dual purposes: they are attached to the piston rod for positional indication and also function as integral parts of the piston assembly, reducing the need for separate components.
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 eliminates stall and installation position constraints, providing a simplified and efficient pressure increase without mechanical friction, while maintaining reliable operation.
Implementation Method 1
magnetic field sensors positioned on the outer wall of the cylinder and suitable to detect that a limit switch position has been reached through the presence of a magnet on at least one of the two pistons
Data Source
AI summary
A pressure multiplier having a cylinder assembly, a command device, and an electronic control unit is provided. The electronic control unit is configured to obtain a switching signal to be provided to the command device from a compression curve which, knowing pressure of a fluid entering the pressure multiplier, binds a pressure increase of the fluid exiting the pressure multiplier with a switching frequency of a piston of the cylinder assembly.