Compressor Shaft Position Control via Temperature Compensation
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Solution Overview
Problem
Conventional chiller systems experience surge phenomena due to high compression ratios, leading to refrigerant backflow and frequent compressor damage, with existing gap sensors being unreliable due to temperature changes affecting displacement measurements.
Innovation Solution
A compressor system equipped with a gap sensor and a temperature compensation sensor to accurately measure the displacement of the rotation shaft, using a control unit to adjust current supply to thrust bearings for precise positioning and preventing surge occurrences with minimal force and current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a gap sensor is used to detect the position of the rotation shaft, then the position can be sensed, but the measurement accuracy deteriorates due to temperature changes affecting the output value
Solution Approach 1:
A temperature compensation sensor is introduced as an intermediary element to detect temperature changes around the gap sensor. The compensation sensor's output is used to adjust the gap sensor's measurement, eliminating the temperature-induced measurement errors without directly modifying the gap sensor itself.
Solution Approach 2:
The system compensates for temperature effects by detecting temperature changes and using these parameter changes to adjust the gap sensor's output. The control unit modifies the measurement parameters based on temperature compensation values, maintaining accurate position detection across varying temperature conditions.
2Productivity
If the compression ratio is increased to improve cooling performance, then the cooling capacity increases, but surge phenomenon occurs causing refrigerant backflow and compressor damage
Solution Approach 1:
The control unit proactively adjusts the rotation shaft position using thrust bearings before surge occurs. By detecting temperature changes and predicting potential surge conditions, the system pre-adjusts the shaft position to prevent refrigerant backflow and compressor damage before they happen.
Solution Approach 2:
The system continuously monitors temperature changes around the gap sensor and uses this feedback to dynamically adjust the rotation shaft position. The control unit modifies thrust bearing current based on temperature compensation values, creating a closed-loop control system that prevents surge phenomenon while maintaining high compression ratios.
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 system effectively detects and prevents surge occurrences, reducing compressor damage by accurately measuring shaft position and adjusting thrust bearing current, ensuring efficient operation and extending compressor lifespan.
Implementation Method 1
a gap sensor measuring a displacement change of the rotation shaft as a frequency change
Implementation Method 2
a temperature compensation sensor determining a frequency compensation value according to a temperature change around the gap sensor
Data Source
AI summary
A compressor is provided. The compressor according to the present disclosure includes: one or more impellers suctioning and compressing refrigerant; a motor rotating the impeller; a rotation shaft to which the impeller and the motor are connected; a gap sensor measuring a displacement change of the rotation shaft as a frequency change; a temperature compensation sensor determining a frequency compensation value according to a temperature change around the gap sensor; and a control unit calculating a displacement amount of the rotation shaft by reflecting the frequency compensation value provided by the temperature compensation sensor and the frequency change measured by the gap sensor.