Operation controlling apparatus and method of reciprocating compressor
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Solution Overview
Problem
Existing reciprocating compressor operation controlling systems incur additional costs and increased volume due to the use of multiple switches for mode switching, leading to inefficiencies and higher costs as the number of switches increases, particularly in systems using two-stage operation modes.
Innovation Solution
An operation controlling apparatus for reciprocating compressors that detects torque, rotation speed, and counter electromotive voltage to determine mode switching points, allowing for operation in multiple modes without additional hardware switches, utilizing a three-group inverter IPM and control algorithm to optimize efficiency and reduce costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple switches are used for mode switching in reciprocating compressor operation controlling systems, then the compressor can operate in multiple modes, but the device complexity and cost increase due to additional hardware components
Solution Approach 1:
The patent extracts and removes the switch component from the system by utilizing the body diodes inherent in the IGBTs of the three-group inverter. Instead of adding external switches for mode switching, the invention leverages the existing semiconductor structure to achieve the same functionality, thereby eliminating the need for additional switches and reducing device complexity
Solution Approach 2:
The three-group inverter's IGBT body diodes are made to serve multiple functions: they act as freewheeling diodes for normal operation and simultaneously serve as switching elements for mode switching. This multi-functionality allows the system to operate in different modes without requiring dedicated switches, thus maintaining adaptability while reducing hardware complexity
2Adaptability or versatility
If multiple switches are added for mode switching, then the compressor can adapt to different operation modes, but the volume of the controlling apparatus increases
Solution Approach 1:
The patent merges the mode switching function with the existing inverter structure by utilizing the body diodes that are already integrated into the IGBT modules. This consolidation eliminates the need for separate switch components and their associated mounting space, thereby maintaining operation mode flexibility while reducing the overall volume of the controlling apparatus
3Adaptability or versatility
If traditional switch-based mode switching is used, then operation modes can be changed, but costs increase due to additional hardware components
Solution Approach 1:
The invention enables the system to perform mode switching using its own inherent components - the body diodes of the IGBTs - without requiring external switch components. This self-service approach allows the compressor to achieve multi-mode operation capability while avoiding the additional manufacturing costs associated with procuring and installing extra switches
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 enables the reciprocating compressor to operate in multiple modes without additional hardware, reducing costs and improving efficiency by optimizing the control of operation modes, thereby enhancing the overall performance and reducing the complexity of the operation controlling apparatus.
Implementation Method 1
detecting torque output by a motor of the reciprocating compressor, a rotation speed of the motor, a counter electromotive voltage of the motor, and a current applied to the motor
Implementation Method 2
a piston coupled to the crankshaft to change a rotational force of the rotation motor to a linear reciprocation motion
Implementation Method 3
The inverter 30 may operate based on input of a control signal through pulse width modulation (PWM)
Data Source
AI summary
An operation controlling apparatus of a reciprocating compressor includes: a detector configured to detect a torque output by a motor of the reciprocating compressor, a rotation speed of the motor, a counter electromotive voltage of the motor, and a current applied to the motor; a controller configured to determine a mode switching time point for switching an operation mode of the reciprocating compressor based on the torque, the rotation speed, the counter electromotive voltage, and the current of the motor, and output a control signal for changing a wire ratio of the motor corresponding to the operation mode; and a driver configured to change the wire ratio of the motor based on the control signal and operate the reciprocating compressor in the operation mode among at least two operation modes.