Piston Pump Electromagnet Coil Dual Quenching Control
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Solution Overview
Problem
Existing piston pumps driven by an electromagnet coil face inefficiencies in current quenching, leading to inadequate filling of the pump volume and noise issues due to abrupt current cessation, which can result in the piston striking a stop, especially under high hydraulic resistance or intense current application.
Innovation Solution
Implementing a dual quenching method for the coil current, comprising a weak quenching method to hold the piston at a stop and a strong quenching method to rapidly release it, utilizing different resistances in the freewheeling circuit to control the magnetic force and optimize pumping behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If rapid quenching is implemented by conducting current via a component that rapidly converts energy into heat, then the current decay speed is improved, but the pump volume filling is insufficient and noise increases
Solution Approach 1:
The quenching process is segmented into multiple stages with different resistance values. The method divides the current decay into phases: initial rapid quenching to quickly reduce magnetic force, followed by slower quenching to maintain sufficient current for complete pump volume filling, and finally strong quenching to stop current flow. This segmentation resolves the contradiction by allowing different quenching speeds at different times during the piston cycle.
Solution Approach 2:
The quenching resistance is made dynamic rather than static. The control device adjusts the resistance value in the freewheeling circuit based on the piston position and operating conditions. During early quenching, lower resistance allows faster decay; during later stages, higher resistance maintains current longer for complete filling. This dynamic adjustment resolves the contradiction between rapid quenching and sufficient filling time.
2Force
If intense current application is used to drive the piston, then the driving force is improved, but the piston strikes the stop causing noise
Solution Approach 1:
The control device applies preliminary quenching action before the piston reaches the stop. By monitoring piston position and anticipating the stop condition, the system begins reducing current flow in advance, gradually decreasing the magnetic force to prevent abrupt impact. This preliminary action resolves the contradiction by maintaining sufficient driving force during most of the stroke while preventing noisy impact at the end.
Solution Approach 2:
The method implements a final strong quenching phase that rapidly cuts off current just before piston-stop contact. This 'rushing through' the final current decay phase eliminates the magnetic force abruptly at the optimal moment, preventing the piston from striking the stop with full force. This resolves the contradiction by maintaining high force during the power stroke while eliminating impact noise at termination.
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 approach enhances volumetric efficiency by allowing sufficient time for fluid to fill the pump volume and enables flexible control of the piston's movement, reducing noise and energy loss while maintaining efficient operation across varying operating states.
Implementation Method 1
During a switch-on period, a voltage is applied to the coil, so that said voltage drives a current through the coil. The coil produces magnetic forces and accelerates the piston.
Implementation Method 2
Rapid quenching can be implemented by the current being conducted via a component which rapidly converts the energy in the coil into heat.
Data Source
AI summary
The invention relates to a method for operating a piston pump, which is driven by means of a coil (1) of an electromagnet, wherein a piston (2) of the piston pump can be moved against a restoring force by means of the electromagnet, wherein a voltage (U) is applied to the coil (1) during a switch-on duration such that a current (I) flows through the coil (1) and the piston (2) is accelerated, wherein two different quenching methods are used for the current (I) in the coil (1).