Electromagnetic Piston Pump Actuation for Noise Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Piston pumps driven by electromagnets generate noise due to piston impact against a limit stop and have inefficient actuation, leading to suboptimal efficiency and increased wear.
Innovation Solution
A method for detecting the impact time point of the piston on the limit stop by analyzing the time characteristics of electrical state variables, such as current or voltage, allowing for improved control and regulation of the pumping process, which includes determining the impact time point through temporal derivation or differential characteristics, and using this information to optimize the energization of the coil to reduce noise and energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the coil is energized for a fixed duration to drive the piston, then the pump action is completed, but the piston impacts the limit stop causing noise and wear
Solution Approach 1:
The patent applies dynamics by making the coil energization duration variable rather than fixed. The control device adjusts the energization time based on detected piston position and velocity, allowing the piston to decelerate before reaching the limit stop. This dynamic adjustment resolves the contradiction by maintaining pump productivity while eliminating harmful impacts through adaptive timing control.
Solution Approach 2:
The patent implements feedback by using sensors to detect piston position and velocity, then feeding this information back to the control device. The control device uses this feedback to dynamically adjust the coil energization duration, ensuring the piston reaches the limit stop with minimal velocity. This feedback mechanism resolves the contradiction by enabling real-time optimization of energization timing to prevent harmful impacts while maintaining pumping efficiency.
2Object-affected harmful factors
If the coil is energized longer to reduce piston velocity and prevent impact, then noise and wear are reduced, but energy consumption increases
Solution Approach 1:
The patent applies partial action by energizing the coil only for the necessary duration to achieve the desired piston velocity at the limit stop, rather than using excessive energization time. The control device calculates and applies just enough energy to decelerate the piston appropriately, avoiding both harmful impacts and unnecessary energy consumption. This principle resolves the contradiction by optimizing energization to the minimum required level.
3Object-affected harmful factors
If the piston velocity is reduced before reaching the limit stop, then noise and wear are reduced, but the pump efficiency decreases
Solution Approach 1:
The patent applies preliminary action by initiating the deceleration process before the piston reaches the limit stop. The control device detects the piston approach and adjusts coil energization in advance to reduce velocity gradually, ensuring the piston arrives at the limit stop with minimal impact velocity. This preliminary velocity reduction maintains pump efficiency by avoiding abrupt stops while still preventing harmful impacts.
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 method significantly reduces noise and wear by optimizing the energization of the coil, allowing the piston to reach the limit stop at a lower speed with reduced energy input, thereby improving the efficiency and operational performance of the piston pump.
Implementation Method 1
When a current flows in the coil 1, a magnetic flux is generated through the interior thereof. Consequently, the piston 2 is magnetically repelled from the valve unit 7
Implementation Method 2
the helical spring 5 is pretensioned against its abutment 6. The volume between the valve unit 7 and the piston head 4 expands... By the pretensioning of the helical spring 5, the piston 2 is then moved in the direction of the valve unit 7
Data Source
AI summary
The invention relates to a method for operating a piston pump (10) which is driven by means of a coil (1) of an electromagnet. A piston (2) of the piston pump (10) can be moved in a cylinder (3) for pumping purposes by means of the electromagnet. A voltage (U) is applied to the coil (1) during a switch-on period such that a current flows through the coil (1) and the piston (2) is accelerated, said voltage being applied by means of an actuation device (11). A time curve of an electric state variable (I, U) of the coil (1) is qualitatively detected, and the curve or a curve derived therefrom is analyzed in order to detect an impact of the piston (2) against a stop. The invention further relates to an actuation device and a piston pump.