Compressor Assembly Liquid Level Detection Using Dual Temperature Sensors
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Solution Overview
Problem
Existing compressor systems lack effective methods to accurately determine the lubricant level in the lubricant sump, which can lead to inefficient operation and potential damage due to either lubricant depletion or overfilling, affecting the reliability and efficiency of climate-control systems.
Innovation Solution
The compressor incorporates a control module that utilizes first and second temperature sensors, potentially a pressure sensor, and a heating element to determine the lubricant level by measuring temperature differences and standard deviations, and comparing ratios to assess if the lubricant level is below a predetermined threshold, thereby ensuring adequate lubrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional single-point temperature sensing is used, then device complexity is reduced, but measurement precision of lubricant level is insufficient
Solution Approach 1:
The single temperature sensing point is segmented into multiple temperature sensing points arranged at different vertical positions within the lubricant sump. This segmentation allows the system to detect temperature variations at different heights, which correspond to different lubricant levels, thereby improving measurement precision without requiring a single complex sensor.
Solution Approach 2:
The system transitions from one-dimensional single-point temperature measurement to multi-dimensional spatial temperature measurement by arranging sensors at different vertical positions. This dimensional expansion enables the system to infer lubricant level information through temperature gradient analysis across multiple spatial points.
2Reliability
If no lubricant level monitoring is implemented, then device complexity is minimized, but reliability of compressor operation deteriorates
Solution Approach 1:
The system implements feedback monitoring by continuously measuring temperature differences at multiple vertical positions and comparing these measurements against reference values or thresholds. When the temperature difference indicates abnormal lubricant level conditions, the system provides feedback signals to control mechanisms, enabling proactive reliability management through automated monitoring and response.
Solution Approach 2:
The system replaces complex mechanical level sensing mechanisms with thermal field-based temperature measurement and analysis. By using temperature sensors and analyzing temperature gradients in the lubricant, the system achieves reliable lubricant level monitoring without requiring direct mechanical contact or complex mechanical level detection apparatus.
3Measurement precision
If multiple temperature sensors at different positions are used, then lubricant level detection accuracy is improved, but use of energy increases
Solution Approach 1:
The system leverages the natural thermal properties of the lubricant and the compressor's operational heat generation to perform level detection. The temperature sensors measure passive thermal fields created by the compressor's operation and the lubricant's thermal behavior, rather than requiring active heating or cooling mechanisms. This self-service approach minimizes additional energy consumption while maintaining detection accuracy.
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 solution enables continuous monitoring and determination of the lubricant level, preventing operational issues by accurately identifying when the lubricant is low or excessively high, thus maintaining optimal compressor performance and preventing damage.
Implementation Method 1
The first temperature sensor is at least partially disposed within the shell at a first position. The second temperature sensor is at least partially disposed within the shell at a second position that is vertically higher than the first position.
Implementation Method 2
the compressor includes a heating element configured to heat liquid within said lubricant sump
Implementation Method 3
the compressor includes a pressure sensor disposed at least partially within the shell. The control module may determine whether the liquid level is below the predetermined level based on whether data from the pressure sensor indicates a presence of liquid working fluid in the shell.
Data Source
AI summary
A compressor may include a shell, a compression mechanism, first and second temperature sensors, and a control module. The shell may define a lubricant sump. The compression mechanism may be disposed within the shell and may be operable to compress a working fluid. The first temperature sensor may be at least partially disposed within the shell at a first position. The second temperature sensor may be at least partially disposed within the shell at a second position that is vertically higher than the first position. The control module may be in communication with the first and second temperature sensors and the pressure sensor and may determine whether a liquid level in the lubricant sump is below a predetermined level based on data received from the first and second temperature sensors.