Compressor Vibration Sensor Mounting for Accurate Degradation Diagnosis
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Solution Overview
Problem
Existing compressor degradation diagnostic technologies face challenges in accurately detecting vibrations caused by rotational motion, leading to imprecise diagnosis due to the location and fixation strength of vibration sensors, which results in mixed noise and reduced detection accuracy.
Innovation Solution
A degradation diagnostic device is designed with a vibration detection system comprising sensors fixed to the outer wall of the compressor shell at the compression mechanism unit's location, using semiconductor-type MEMS sensors and a magnet for stable attachment, allowing precise detection of tangential and circle center direction vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the vibration sensor is mounted on the terminal cover or leg portion of the compressor, then the device structure is simple and easy to install, but the vibration detection accuracy is reduced due to noise mixing and poor fixation strength
Solution Approach 1:
The vibration detection device is segmented into distinct functional components: a base portion for mounting, a sensor holding unit for securing the sensor, and multiple projecting portions for contact with the compressor shell. This segmentation allows each component to be optimized independently - the base portion provides stable mounting while the sensor holding unit ensures precise sensor positioning, resolving the contradiction between easy installation and detection accuracy.
Solution Approach 2:
The device applies local quality by concentrating multiple projecting portions at specific locations on the base portion that contact the compressor shell. This creates localized high-strength fixation points that ensure stable sensor mounting without requiring complex overall structure, thus achieving both ease of manufacture and measurement precision.
2Reliability
If the vibration sensor is placed at positions away from the compression mechanism unit (such as terminal cover), then the sensor is protected from harsh operating conditions, but the vibration caused by rotational motion cannot be detected with high accuracy
Solution Approach 1:
The compressor shell acts as an intermediary medium between the compression mechanism unit and the vibration sensor. The sensor detects vibrations transmitted through the shell rather than contacting the compression mechanism directly, thus protecting the sensor from harsh operating conditions while maintaining high detection accuracy of rotational vibrations.
Solution Approach 2:
The invention transitions from direct contact measurement to indirect measurement through the shell surface. By mounting the sensor on the outer wall of the shell rather than inside the compression mechanism, the measurement is shifted to another dimension (external surface), allowing protected yet accurate detection of vibrations.
3Ease of operation
If the vibration sensor is mounted without sufficient fixation strength (such as on terminal cover), then the installation is simple, but noise mixes with the vibration detection value reducing diagnostic precision
Solution Approach 1:
The sensor holding unit is designed with pre-formed projecting portions that are prepared in advance to contact the compressor shell. This preliminary structuring ensures that when the device is installed, the sensor is automatically positioned and fixed with adequate strength, eliminating the need for complex additional fixation steps while maintaining signal quality.
Solution Approach 2:
The base portion and sensor holding unit may utilize composite material structures or material combinations that provide both ease of manufacturing/installation and sufficient fixation strength. This allows the device to achieve both operational simplicity and measurement precision without compromising either aspect.
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 configuration enables high-accuracy detection of compressor degradation by effectively isolating the vibration sensors from noise and ensuring stable fixation, thereby improving the precision of degradation diagnosis.
Implementation Method 1
a vibration sensor configured to detect vibration of the compressor
Implementation Method 2
using semiconductor-type MEMS sensors and a magnet for stable attachment
Data Source
AI summary
Provided is a degradation diagnostic device, which is configured to perform a diagnosis for degradation of a compressor including a compression mechanism unit to be driven along with a rotational motion of a rotary shaft, and a shell, which is configured to form an outer casing. The degradation diagnostic device includes a vibration detection device to be fixed onto an outer wall of the shell at a position at which the compression mechanism unit is located. The vibration detection device includes: a vibration sensor, which is configured to detect vibration of the compressor; a sensor holding unit including the vibration sensor; a base portion to which the sensor holding unit is connected; and a plurality of projecting portions, which are formed on a surface of the base portion on a side opposite to the sensor holding unit and to be brought into contact with the outer wall.