Liquid level sensor and compressor using the same

Abstract

The invention provides a liquid level sensor of a compressor. The liquid level sensor comprises a compressor housing. An oil storing cavity of freezing lubricating oil is arranged in the compressor housing. An opening is arranged in the compressor housing. The liquid level sensor comprises a housing body with an opening which is in sealed connection with the opening of the compressor housing. The liquid level sensor also comprises a filtering screen which is arranged on the inner side of the opening of the housing body. The filtering screen surrounds at least parts of inner wall of the housing body, so a detection cavity communicated with the oil storing cavity via the filtering screen is formed. The liquid level sensor also comprises a floating ball which is arranged in the detection cavity and rises and descends along with change of liquid levels of the freezing lubricating oil. At least one permanent magnet is arranged on the floating ball. The liquid level sensor further comprises an inductor which is installed on the outer wall surface of the housing body. The inductor can be easily assembled later and pre-assembled for mass production, individually changed and more suitable for small semi-enclosed and fully-enclosed compressors.

Description

technical field [0001] The invention relates to a liquid level sensor, in particular to a liquid level sensor for detecting the oil level of refrigerated lubricating oil in an oil storage chamber inside a compressor and a compressor using the liquid level sensor. Background technique [0002] For compressors, most structures need to be lubricated with refrigerated lubricating oil during operation to cool the heat generated by the running-in of the internal components of the compressor, so as to prolong the operating life of the compressor and improve the operating efficiency. Therefore, the oil storage chamber inside the compressor is generally equipped with a liquid level sensor, which is used to detect the liquid level of the oil storage chamber. At or above a certain height (whether the oil quantity is insufficient or too large). When the amount of oil is insufficient or the amount of oil is too large, the liquid level sensor will generate a corresponding signal, and the...

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Problems solved by technology

[0003] In the prior art, the application environment of liquid level sensors is complex and changeable

First of all, refrigerated lubricating oil is a mixture of refrigerated oil and refrigerant with high viscosity. The working temperature ranges from -20°C to 120°C and the pressure ranges from 0 to 5Mpa, resulting in large changes in the density and viscosity of the mixture. The floating ball of the sub-type liquid level sensor has high requirements; secondly, the compressor vibrates greatly during operation, resulting in foam and liquid level fluctuations in the frozen lubricating oil, and the liquid level sensor needs to avoid the influence of foam and liquid level fluctuations on the detection accuracy; finally, For the magnetic float liquid level sensor, the electromagnetic radiation of the motor also affects the detection accuracy of the liquid level sensor, making it difficult to detect the electromagnetic signal of the sensor

[0004] In the prior art, during the manufacturing and assembly process of the compressor, the welding temperature and drying temperature are high, and the excessively high temperature will affect the sensor performance of the liquid level sensor, thereby affecting the pre-assembly of the sensor

In addition, after the compressor is assembled, it is difficult to replace the magnetic sensor separately in the subsequent use process, which is not convenient for later maintenance

[0005] The existing problems of liquid level sensors used in compressors in the prior art also include: capacitive liquid level sensors, pF-level signals are difficult to measure, and the cost of their transmitters is high; photoelectric liquid level sensors are expensive and are not suitable for application Small compressors; at present, the liquid level sensors are installed in the compressor casing, and the installation space of the compressor is small. Due to the large volume of the capacitive liquid level sensor and the large installation space requirements, it is generally not suitable for small compressors; Capacitive liquid level sensors, photoelectric liquid level sensors and magnetic float liquid level sensors in the prior art are more suitable for semi-hermetic compressors than hermetic compressors.

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