Reciprocating Compressor Resonance Frequency Control
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Solution Overview
Problem
Reciprocating compressors face efficiency degradation due to constant operating frequency despite load variations, such as outdoor or condenser temperature changes, which leads to suboptimal performance.
Innovation Solution
An apparatus and method that calculates the mechanical resonance frequency based on current and stroke applied to the compressor, determining an operating frequency command value within a predetermined range to align the compressor's operation frequency with the mechanical resonance frequency, thereby improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the compressor operates at a constant frequency, then the control system is simple, but the operational efficiency degrades due to load variations
Solution Approach 1:
The patent applies dynamics by transitioning from constant frequency control to variable frequency control that adapts to load conditions. The controller dynamically adjusts the operating frequency based on detected mechanical resonance frequency, allowing the system to optimize efficiency under varying loads while maintaining relatively simple control logic through automated feedback.
2Productivity
If the operating frequency is adjusted to match mechanical resonance frequency, then operational efficiency improves, but the control system complexity increases
Solution Approach 1:
The patent implements feedback control by detecting the mechanical resonance frequency during operation and using this information to adjust the operating frequency. The controller continuously monitors system response and adapts the driving frequency to maintain alignment with resonance conditions, optimizing efficiency without requiring complex manual intervention.
Solution Approach 2:
The system applies self-service by automatically detecting and adapting to its own mechanical resonance characteristics. The compressor controller autonomously identifies resonance frequency through operational monitoring and self-adjusts the operating parameters, eliminating the need for external expert intervention or complex manual tuning procedures.
3Ease of manufacture
If mechanical conversion devices are used to transform rotary movement, then the reciprocating compressor can be constructed, but energy transformation loss increases and structure becomes complex
Solution Approach 1:
The patent extracts and eliminates intermediate mechanical conversion components by directly coupling the linear motor to the piston. This removal of unnecessary mechanical transmission elements (such as crankshafts, connecting rods, or gear systems) reduces energy transformation losses while simplifying the overall compressor structure.
Solution Approach 2:
The patent substitutes traditional mechanical conversion systems with a linear motor that directly generates linear motion. This replacement eliminates the need for rotary-to-linear mechanical transformation devices, reducing friction, wear, and energy loss while maintaining the reciprocating compression function.
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 operational efficiency by optimizing the compressor's frequency to match load variations, resulting in improved performance and reduced energy losses.
Implementation Method 1
calculating a mechanical resonance frequency based on a current and a stroke applied to a compressor
Implementation Method 2
making the operation frequency of the compressor consistent with a mechanical resonant frequency
Data Source
AI summary
The present invention relates to an apparatus and method for controlling operation of a reciprocating compressor. The operating efficiency of the compressor can be improved by performing the steps of: detecting a current and a stroke applied a compressor; a calculating a mechanical resonance frequency by using the detected current and stroke; and determining an operating frequency command value by adding or subtracting the present operating frequency so as to be within a predetermined range of the calculated mechanical resonance frequency and then driving the compressor by the operating frequency command value.