WO2016180276A1 - Method for measuring dilution degree of lubricating oil, sensor, and method for detecting oil level - Google Patents

Method for measuring dilution degree of lubricating oil, sensor, and method for detecting oil level Download PDF

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WO2016180276A1
WO2016180276A1 PCT/CN2016/081256 CN2016081256W WO2016180276A1 WO 2016180276 A1 WO2016180276 A1 WO 2016180276A1 CN 2016081256 W CN2016081256 W CN 2016081256W WO 2016180276 A1 WO2016180276 A1 WO 2016180276A1
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dielectric constant
relative dielectric
oil
lubricating oil
compressor
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PCT/CN2016/081256
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French (fr)
Chinese (zh)
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孙英科
李靖远
刘鹏
张乐平
菲利普·德威特
皮埃尔·吉尼
范亮
王东东
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丹佛斯（天津）有限公司
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Publication of WO2016180276A1 publication Critical patent/WO2016180276A1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/26—Oils; Viscous liquids; Paints; Inks
    • G01N33/28—Oils, i.e. hydrocarbon liquids
    • G01N33/30—Oils, i.e. hydrocarbon liquids for lubricating properties
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance

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  • the invention relates to the technical field of a heating and ventilation air conditioning refrigeration system, in particular to a dilution of a lubricating oil in a compressor and detection of an oil level.
  • the refrigerant will dissolve into the lubricating oil. Since the refrigerant dissolves into the oil, the lubricating oil is diluted, resulting in a decrease in the viscosity of the oil, which eventually causes the compressor shaft to wear heavily and destroy the compressor. Therefore, the rate of dissolution of refrigerant and oil in the compressor sump must be monitored in real time to ensure effective lubrication. Once the dilution of the oil is found to be above the upper limit, immediately turn off the compressor or reduce the dilution of the oil by an appropriate method.
  • the dilution of the lubricating oil can be obtained by measuring the viscosity, density, or absorption rate or refractive index of the light in the lubricating oil and the refrigerant mixture to obtain the solubility of the refrigerant in the lubricating oil.
  • One of the objects of the present invention is to provide a method of detecting the dilution of lubricating oil in a compressor, a sensor, and a method of detecting the oil level of the compressor and a compressor.
  • a method of measuring a dilution of a lubricating oil of a compressor comprising:
  • a head of a sensor disposed on a casing of the compressor measures a relative dielectric constant of a liquid in an oil sump inside the compressor;
  • the method further includes monitoring a change in the dilution of the lubricating oil based on the change in the relative dielectric constant.
  • the head of the sensor includes an intermediate copper post, and an outer sleeve surrounding the copper post and spaced apart from the copper post, wherein the lubricating oil is from the copper post and the outer sleeve The space between them flows.
  • the length of the head of the sensor is L
  • the dielectric constant of the vacuum is ⁇ 0
  • the relative dielectric constant of the mixture of lubricating oil and refrigerant is ⁇ r
  • the inner diameter of the outer sleeve is R
  • the outer diameter of the middle copper column is r
  • the relationship between the capacitance and the relative dielectric constant is:
  • the lubricating oil is PVE 68 and the refrigerant is R410A.
  • the predetermined lubricating oil dilution x is a function of the corresponding relative dielectric constant y:
  • y 0.0003x 2 +0.0416x+2.8374, where x ranges from 0% to 100%.
  • the lubricating oil is 160 SZ and the refrigerant is R410A.
  • the method further includes detecting whether the oil level of the lubricating oil in the compressor is normal while measuring the dilution of the lubricating oil based on the detected relative dielectric constant.
  • the oil level in the compressor is normal
  • the oil level in the compressor is abnormal.
  • the relative dielectric constant of the liquid in the oil bath in the liquid state is 3.14;
  • the relative dielectric constant of the liquid in the oil bath in the gaseous state was 1.46.
  • a sensor comprising:
  • a detecting head inserted into the oil sump of the compressor in a horizontal direction and configured to detect a relative dielectric constant of the liquid in the oil sump;
  • a first calculating unit configured to calculate an oil dilution of the liquid according to the relative dielectric constant
  • a second calculating unit configured to display whether the oil level in the oil pool is lower or higher than the detecting head according to the relative dielectric constant.
  • the senor is disposed on a casing of the compressor, the head of the sensor measuring the relative dielectric constant of the liquid in the oil sump inside the compressor, and then the same lubrication based on a predetermined different mixing ratio Calculating a fitting relationship between the dilution of the lubricating oil of the mixture of the oil and the same refrigerant and the corresponding relative permittivity to obtain a dilution of the lubricating oil corresponding to the relative dielectric constant of the liquid measured by the sensor, wherein
  • the liquid is a lubricating oil or a mixture of lubricating oil and refrigerant.
  • the head of the sensor includes an intermediate copper post, and an outer sleeve surrounding the copper post and spaced apart from the copper post, wherein the lubricating oil is from the copper post and the outer sleeve The space between them flows.
  • the second calculation unit of the sensor detects whether the oil level of the lubricating oil in the compressor is normal while measuring the dilution of the lubricating oil based on the detected relative dielectric constant.
  • the second computing unit displays that the oil level in the compressor is normal
  • the second calculation unit indicates that the oil level in the compressor is abnormal.
  • a method of detecting if the oil level in a compressor is normal includes:
  • the oil level in the compressor is not normal.
  • a compressor including a sensor according to the above.
  • the method for measuring the dilution of the lubricating oil, the sensor, the method of measuring the oil level in the compressor, and the compressor obtained at least the lubricating oil by measuring the dielectric constant of the mixture of the lubricating oil and the refrigerant. Dilution or oil level, even both.
  • FIG. 1 is a schematic view showing a state of use of a sensor in a lubricating oil according to an embodiment of the present invention
  • Figure 2 is a schematic view showing the state of use of the sensor shown in Figure 1 exposed to a gaseous refrigerant;
  • Figure 3 is a schematic illustration of the head of the sensor shown in Figure 1;
  • Figure 4 is a graph showing the relationship between the dilution d of the lubricating oil and the corresponding relative permittivity y in the case where the lubricating oil is PVE 68 and the refrigerant is R410A.
  • a method of measuring the dilution of a lubricating oil of a compressor and a sensor for measuring the dilution of the lubricating oil of the compressor using the method are provided.
  • a mixture 2 of a lubricating oil and a refrigerant in a certain mixing ratio is provided (provided or stored) at the bottom end of the inside of the compressor 1.
  • each mixing ratio described herein means that the proportion of the refrigerant in the mixture 2 is 0-100%, that is, there may be no refrigerant, a certain proportion of the refrigerant, and all Refrigerants.
  • a sensor 3 is mounted on the outer casing of the compressor 1.
  • the sensor 3 is detected by the principle of capacitance detection.
  • the head of the sensor 3 is capable of measuring the dielectric constant of the mixture 2 of the lubricating oil and the refrigerant at a certain mixing ratio at the bottom end of the inside of the compressor 1, thereby obtaining a corresponding relative dielectric constant, which can be determined based on a predetermined
  • the relationship between the dilution of the lubricating oil of the mixture of the same lubricating oil and the same refrigerant of the same refrigerant and the corresponding relative dielectric constant is calculated to obtain the relative dielectric constant of the liquid measured by the sensor at this time.
  • Lubricating oil dilution is calculated to obtain the relative dielectric constant of the liquid measured by the sensor at this time.
  • the illustrated oil level is in a normal state, and the head of the sensor 3 is completely submerged in the lubricating oil or the mixture of lubricating oil and refrigerant 2, thereby being able to measure the lubricating oil or lubricating oil and cooling at this time.
  • the head 30 of the sensor includes an intermediate copper post 31, and an outer sleeve 32 surrounding the copper post 31 and spaced apart from the copper post 31, wherein the lubricating oil is from the copper post 31 and the outer sleeve 32.
  • the space between them flows in the direction indicated by the arrow.
  • the length of the head of the sensor is L
  • the dielectric constant of the vacuum is ⁇ 0
  • the relative dielectric constant of the mixture of lubricating oil and refrigerant is ⁇ r
  • the inner diameter of the outer sleeve 32 is R and the outer copper column 31 is outside.
  • the diameter is r, where the capacitance
  • the relative dielectric constant and lubricating oil solubility (dilution) of the lubricating oil under different working conditions have been measured (for example, in the laboratory).
  • the relationship between the two is shown in Figure 4.
  • the dilution of the lubricating oil and the refrigerant increases, the relative dielectric constant also rises accordingly.
  • the predetermined relationship between the dilution d of the lubricating oil and the corresponding relative permittivity y is:
  • y 0.0003x 2 +0.0416x+2.8374, where x ranges from 0% to 100%.
  • the control unit of the compressor will respond immediately, stop the operation of the compressor, or evaporate the refrigerant in the lubricating oil by an appropriate method.
  • the dilution ratio of the lubricating oil of the mixture 2 of the lubricating oil and the refrigerant of different mixing ratios can be calculated.
  • the method of the present invention can also be used to detect whether the oil level of the lubricating oil is normal.
  • the oil level is another very important factor that is directly related to the life of the compressor. If the oil level is too low, such as caused by a very high OCR, there will not be enough lubricant in the compressor to lubricate. This will destroy the compressor in a very short time. Therefore, the oil level of the compressor must also be monitored online in real time. Once the oil level is found to be below the minimum alarm value, the compressor is shut down immediately.
  • the oil level measurement method includes a method of using a float reed switch.
  • photoelectric switches are widely used to measure oil levels.
  • current methods have some drawbacks. For example, for compressor applications, the internal pressure can reach 45 bar enough to damage or deform the float on the reed switch, and the foam inside the lubricant can also interfere with the photoelectric The switch causes the photoelectric switch to misjudge the oil level.
  • the oil level in the compressor is below the minimum lower limit due to high OCR or other reasons. At this time, the head of the sensor 3 is exposed to the gaseous refrigerant as shown in FIG.
  • the tests described in Table 1 below can be performed.
  • the lubricating oil was 160 SZ and the refrigerant was R410A. Pure gaseous, pure liquid, saturated, pure under different working conditions The relative dielectric constants of the oil and the mixture of lubricating oil and refrigerant are measured.
  • a detecting head inserted into the oil pool of the compressor 1 in a horizontal direction and configured to detect a relative dielectric constant of the liquid in the oil pool;
  • a first calculating unit configured to calculate an oil dilution of the liquid according to the relative dielectric constant
  • a second calculating unit configured to display whether the oil level in the oil pool is lower or higher than the detecting head according to the relative dielectric constant.
  • the senor 3 is disposed on the outer casing of the compressor 1, and the head or the detecting head of the sensor is capable of measuring the relative dielectric constant of the liquid in the oil pool inside the compressor 1, and further based on a predetermined different mixing ratio Fitting the dilution of lubricating oil of the same lubricating oil with the same refrigerant and the corresponding relative dielectric constant The relationship calculation obtains a dilution of the lubricating oil corresponding to the relative dielectric constant of the liquid measured by the sensor, wherein the liquid is a lubricating oil or a mixture 2 of lubricating oil and refrigerant.
  • the head 30 of the sensor 3 includes an intermediate copper post 31, and an outer sleeve 32 surrounding the copper post 31 and spaced apart from the copper post 31, wherein the lubricating oil is from the copper post 31 and outside.
  • the space between the layer sleeves 32 flows.
  • the second calculating unit (not shown) of the sensor 3 detects whether the oil level of the lubricating oil in the compressor is normal while measuring the dilution of the lubricating oil based on the detected relative dielectric constant.
  • the second calculating unit indicates that the oil level in the compressor is normal
  • the second calculation unit indicates that the oil level in the compressor is abnormal.
  • the present invention provides a compressor comprising the sensor according to any of the above embodiments.
  • At least the dilution or oil level of the lubricating oil is obtained by measuring the relative dielectric constant of the mixture of the lubricating oil and the refrigerant, and even both of them are obtained at the same time.

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Abstract

A method for measuring a dilution degree of lubricating oil in a compressor comprises: a head portion of a sensor disposed on a housing of a compressor measuring a relative dielectric constant of a liquid inside an oil tank inside the compressor; and calculating, based on a predetermined fitting relation between a lubricating oil dilution degree of a mixture of a same lubricating oil and a same refrigerant that has a different mixing ratio and a corresponding relative dielectric constant, a lubricating oil dilution degree corresponding to the relative dielectric constant of the liquid. Further provided is a method for detecting whether an oil level inside a compressor is normal, in which it is detected whether an oil level is normal based on a detected relative dielectric constant. Further provided is a sensor, comprising a detection head used to detect a relative dielectric constant of a liquid, a first calculation unit used to calculate a dilution degree of the liquid, and a second calculation unit used to display whether an oil level is normal. Further provided is a compressor that comprises the sensor.

Description

测量润滑油稀释度的方法、传感器和检测油位的方法Method for measuring dilution of lubricating oil, sensor and method for detecting oil level
本申请要求于2015年5月8日递交的、申请号为201510236335.8、发明名称为“测量润滑油稀释度的方法、传感器和检测油位的方法”的中国专利申请的优先权，其全部内容通过引用并入本申请中。The present application claims priority to Chinese Patent Application No. 201510236335.8, entitled "Method for Measuring Dilution of Lubricating Oil, Sensor and Method for Detecting Oil Level", which was filed on May 8, 2015. The references are incorporated into this application.
技术领域Technical field
本发明涉及供热通风空调冷冻系统技术领域，尤其涉及压缩机内的润滑油的稀释度和油位的检测。The invention relates to the technical field of a heating and ventilation air conditioning refrigeration system, in particular to a dilution of a lubricating oil in a compressor and detection of an oil level.
背景技术Background technique
在压缩机运转的过程中，由于非常高的油稀释度会导致润滑油功能失效从而毁坏压缩机。During the operation of the compressor, the very high oil dilution will cause the function of the lubricating oil to fail and destroy the compressor.
尤其是在回液工况下，制冷剂会溶解到润滑油里面。由于制冷剂溶解到油里面会稀释润滑油，导致油的粘度降低，最终导致压缩机轴磨损严重而毁坏压缩机。因此，压缩机油池内制冷剂和油的溶解率必须被实时监控以确保有效的润滑。一旦发现油的稀释度高于上限，立刻关闭压缩机或者通过适当的方法降低润滑油稀释度。Especially in the case of liquid return, the refrigerant will dissolve into the lubricating oil. Since the refrigerant dissolves into the oil, the lubricating oil is diluted, resulting in a decrease in the viscosity of the oil, which eventually causes the compressor shaft to wear heavily and destroy the compressor. Therefore, the rate of dissolution of refrigerant and oil in the compressor sump must be monitored in real time to ensure effective lubrication. Once the dilution of the oil is found to be above the upper limit, immediately turn off the compressor or reduce the dilution of the oil by an appropriate method.
当前，润滑油的稀释度可以通过测量润滑油和制冷剂混合物的粘度、密度或者光在里面的吸收率或者折射率来得到制冷剂在润滑油里面的溶解率来得到。Currently, the dilution of the lubricating oil can be obtained by measuring the viscosity, density, or absorption rate or refractive index of the light in the lubricating oil and the refrigerant mixture to obtain the solubility of the refrigerant in the lubricating oil.
当前的润滑油稀释度测量方法要么成本太高(4万到16万元一只传感器)，要么安装很复杂，并且它们需要大量的数据处理。因此这些方法只适用于实验室做研究，而不适用广泛的工业应用。Current methods of measuring lubricant dilution are either too costly (a sensor of 40,000 to 160,000 yuan) or complicated to install, and they require a lot of data processing. Therefore, these methods are only suitable for laboratory research and not for a wide range of industrial applications.
发明内容Summary of the invention
本发明的目的旨在解决现有技术中存在的上述问题和缺陷的至少一个方面。It is an object of the present invention to address at least one aspect of the above problems and deficiencies existing in the prior art.
本发明的目的之一是提供一种在线检测压缩机内润滑油的稀释度的方法、传感器和检测压缩机的油位的方法和压缩机。One of the objects of the present invention is to provide a method of detecting the dilution of lubricating oil in a compressor, a sensor, and a method of detecting the oil level of the compressor and a compressor.
根据本发明的一个方面，提供了一种测量压缩机的润滑油稀释度的方法，包括：According to one aspect of the invention, a method of measuring a dilution of a lubricating oil of a compressor is provided, comprising:
设置在压缩机的外壳上的传感器的头部测量在所述压缩机内部的油池内的液体的相对介电常数；A head of a sensor disposed on a casing of the compressor measures a relative dielectric constant of a liquid in an oil sump inside the compressor;
基于预先确定的不同混合比例的同一润滑油与同一制冷剂的混合物的润滑油稀释 度与相应的相对介电常数的拟合关系计算获得与所述传感器测量的所述液体的相对介电常数对应的润滑油稀释度；其中，所述液体为润滑油或者润滑油与制冷剂的混合物。Dilution of lubricating oil based on a predetermined mixture of the same lubricating oil and a mixture of the same refrigerant Calculating a fitting relationship between the degree and the corresponding relative permittivity to obtain a dilution of the lubricating oil corresponding to the relative dielectric constant of the liquid measured by the sensor; wherein the liquid is a lubricating oil or a lubricating oil and a refrigerant mixture.
在一个示例中，所述方法还包括：根据所述相对介电常数的变化来监测所述润滑油的稀释度的变化。In one example, the method further includes monitoring a change in the dilution of the lubricating oil based on the change in the relative dielectric constant.
在一个示例中，所述传感器的头部包括中间铜柱、和包围所述铜柱且与所述铜柱间隔开的外层套筒，其中润滑油从所述铜柱和外层套筒之间的空间流过。In one example, the head of the sensor includes an intermediate copper post, and an outer sleeve surrounding the copper post and spaced apart from the copper post, wherein the lubricating oil is from the copper post and the outer sleeve The space between them flows.
在一个示例中，所述传感器的头部的长度为L，真空的介电常数为ε0，润滑油和制冷剂的混合物的相对介电常数为εr，外层套筒的内径为R和中间铜柱的外径为r，其中电容与相对介电常数的关系为：In one example, the length of the head of the sensor is L, the dielectric constant of the vacuum is ε 0 , the relative dielectric constant of the mixture of lubricating oil and refrigerant is ε r , and the inner diameter of the outer sleeve is R and The outer diameter of the middle copper column is r, and the relationship between the capacitance and the relative dielectric constant is:
Figure PCTCN2016081256-appb-000001
Figure PCTCN2016081256-appb-000001
在一个示例中，所述润滑油为PVE68，制冷剂为R410A，所述预先确定的润滑油稀释度x与相应的相对介电常数y之间的函数关系为：In one example, the lubricating oil is PVE 68 and the refrigerant is R410A. The predetermined lubricating oil dilution x is a function of the corresponding relative dielectric constant y:
y＝0.0003x2+0.0416x+2.8374，其中x的取值范围为0％-100％。y=0.0003x 2 +0.0416x+2.8374, where x ranges from 0% to 100%.
在一个示例中，所述润滑油为160SZ，制冷剂为R410A。In one example, the lubricating oil is 160 SZ and the refrigerant is R410A.
在一个示例中，所述方法还包括：基于所检测的相对介电常数，在测量所述润滑油稀释度的同时，检测压缩机内的润滑油的油位是否正常。In one example, the method further includes detecting whether the oil level of the lubricating oil in the compressor is normal while measuring the dilution of the lubricating oil based on the detected relative dielectric constant.
在一个示例中，如果所检测的介电常数大于所述油池内的液体在液态下的相对介电常数，则压缩机内的油位正常；In one example, if the detected dielectric constant is greater than the relative dielectric constant of the liquid in the sump in the liquid state, the oil level in the compressor is normal;
如果所检测的介电常数小于所述油池内的液体在气态下的相对介电常数，则压缩机内的油位不正常。If the measured dielectric constant is less than the relative dielectric constant of the liquid in the sump in the gaseous state, the oil level in the compressor is abnormal.
在一个示例中，所述油池内的液体在液态下的相对介电常数为3.14；In one example, the relative dielectric constant of the liquid in the oil bath in the liquid state is 3.14;
所述油池内的液体在气态下的相对介电常数为1.46。The relative dielectric constant of the liquid in the oil bath in the gaseous state was 1.46.
根据本发明的另一方面，提供了一种传感器，包括：According to another aspect of the present invention, a sensor is provided, comprising:
检测头，所述检测头沿水平方向插入到压缩机的油池内，并且配置成检测所述油池内的液体的相对介电常数；a detecting head inserted into the oil sump of the compressor in a horizontal direction and configured to detect a relative dielectric constant of the liquid in the oil sump;
第一计算单元，配置成根据所述相对介电常数计算所述液体的油稀释度；a first calculating unit configured to calculate an oil dilution of the liquid according to the relative dielectric constant;
第二计算单元，配置成根据所述相对介电常数显示所述油池内的油位是否低于或高于所述检测头。 And a second calculating unit configured to display whether the oil level in the oil pool is lower or higher than the detecting head according to the relative dielectric constant.
在一个示例中，所述传感器设置在压缩机的外壳上，所述传感器的头部测量在所述压缩机内部的油池内液体的相对介电常数，进而基于预先确定的不同混合比例的同一润滑油与同一制冷剂的混合物的润滑油稀释度与相应的相对介电常数的拟合关系计算获得与所述传感器测量的所述液体的相对介电常数对应的润滑油稀释度，其中，所述液体为润滑油或者润滑油与制冷剂的混合物。In one example, the sensor is disposed on a casing of the compressor, the head of the sensor measuring the relative dielectric constant of the liquid in the oil sump inside the compressor, and then the same lubrication based on a predetermined different mixing ratio Calculating a fitting relationship between the dilution of the lubricating oil of the mixture of the oil and the same refrigerant and the corresponding relative permittivity to obtain a dilution of the lubricating oil corresponding to the relative dielectric constant of the liquid measured by the sensor, wherein The liquid is a lubricating oil or a mixture of lubricating oil and refrigerant.
在一个示例中，所述传感器的头部包括中间铜柱、和包围所述铜柱且与所述铜柱间隔开的外层套筒，其中润滑油从所述铜柱和外层套筒之间的空间流过。In one example, the head of the sensor includes an intermediate copper post, and an outer sleeve surrounding the copper post and spaced apart from the copper post, wherein the lubricating oil is from the copper post and the outer sleeve The space between them flows.
在一个示例中，所述传感器的第二计算单元基于所检测的相对介电常数，在测量所述润滑油稀释度的同时，检测压缩机内的润滑油的油位是否正常。In one example, the second calculation unit of the sensor detects whether the oil level of the lubricating oil in the compressor is normal while measuring the dilution of the lubricating oil based on the detected relative dielectric constant.
在一个示例中，如果所检测的相对介电常数大于所述油池内的液体在液态下的相对介电常数，则第二计算单元显示压缩机内的油位正常；In one example, if the detected relative dielectric constant is greater than the relative dielectric constant of the liquid in the oil pool in the liquid state, the second computing unit displays that the oil level in the compressor is normal;
如果所检测的介电常数小于所述油池内的液体在气态下的相对介电常数，则第二计算单元显示压缩机内的油位不正常。If the detected dielectric constant is less than the relative dielectric constant of the liquid in the sump in the gaseous state, the second calculation unit indicates that the oil level in the compressor is abnormal.
在一个示例中，一种检测压缩机内的油位是否正常的方法，包括：In one example, a method of detecting if the oil level in a compressor is normal includes:
检测压缩机油池内液体的相对介电常数；Detecting the relative dielectric constant of the liquid in the compressor oil sump;
基于所检测的相对介电常数，检测压缩机的油池内的润滑油的油位是否正常；Detecting whether the oil level of the lubricating oil in the oil pool of the compressor is normal based on the detected relative dielectric constant;
如果所检测的相对介电常数大于所述油池内的液体在液态下的相对介电常数，则显示压缩机内的油位正常；If the relative dielectric constant detected is greater than the relative dielectric constant of the liquid in the oil pool in the liquid state, then the oil level in the compressor is normal;
如果所检测的介电常数小于所述油池内的液体在气态下的相对介电常数，则显示压缩机内的油位不正常。If the measured dielectric constant is less than the relative dielectric constant of the liquid in the sump in the gaseous state, then the oil level in the compressor is not normal.
在一个示例中，提供了一种压缩机，包括根据上述的传感器。In one example, a compressor is provided, including a sensor according to the above.
本发明的各实施例提供的测量润滑油稀释度的方法、传感器、测量压缩机内的油位的方法和压缩机通过测量润滑油和制冷剂的混合物的介电常数，来至少获得润滑油的稀释度或油位，甚至同时获得上述两者。The method for measuring the dilution of the lubricating oil, the sensor, the method of measuring the oil level in the compressor, and the compressor provided by the embodiments of the present invention obtain at least the lubricating oil by measuring the dielectric constant of the mixture of the lubricating oil and the refrigerant. Dilution or oil level, even both.
附图说明DRAWINGS
本发明的这些和/或其他方面和优点从下面结合附图对优选实施例的描述中将变得明显和容易理解，其中：These and/or other aspects and advantages of the present invention will become apparent and readily understood from
图1是根据本发明的一个实施例的处于润滑油中的传感器的使用状态示意图；1 is a schematic view showing a state of use of a sensor in a lubricating oil according to an embodiment of the present invention;
图2是图1所示的传感器暴露于气态制冷剂中的使用状态示意图； Figure 2 is a schematic view showing the state of use of the sensor shown in Figure 1 exposed to a gaseous refrigerant;
图3是图1所示的传感器的头部的示意图；Figure 3 is a schematic illustration of the head of the sensor shown in Figure 1;
图4是在润滑油为PVE68和制冷剂为R410A的情况下，润滑油稀释度x与相应的相对介电常数y之间的关系图。Figure 4 is a graph showing the relationship between the dilution d of the lubricating oil and the corresponding relative permittivity y in the case where the lubricating oil is PVE 68 and the refrigerant is R410A.
具体实施方式detailed description
下面通过实施例，并结合附图1-4，对本发明的技术方案作进一步具体的说明。在说明书中，相同或相似的附图标号指示相同或相似的部件。下述参照附图对本发明实施方式的说明旨在对本发明的总体发明构思进行解释，而不应当理解为对本发明的一种限制。The technical solution of the present invention will be further specifically described below by way of embodiments and with reference to the accompanying drawings. In the description, the same or similar reference numerals indicate the same or similar parts. The description of the embodiments of the present invention with reference to the accompanying drawings is intended to illustrate the general inventive concept of the invention, and should not be construed as a limitation of the invention.
在本发明的一个实施例中，提供了一种测量压缩机的润滑油稀释度的方法和使用该方法测量压缩机的润滑油的稀释度的传感器。In one embodiment of the invention, a method of measuring the dilution of a lubricating oil of a compressor and a sensor for measuring the dilution of the lubricating oil of the compressor using the method are provided.
如图1和2所示，在压缩机1内部的底端设置(提供或储存)有成某一混合比例的润滑油与制冷剂的混合物2。在此需要说明的是，此处所述的每一混合比例意思是制冷剂在该混合物2中的比例为0-100％，即可以没有制冷剂，可以具有某一比例的制冷剂以及全是制冷剂。As shown in Figs. 1 and 2, a mixture 2 of a lubricating oil and a refrigerant in a certain mixing ratio is provided (provided or stored) at the bottom end of the inside of the compressor 1. It should be noted here that each mixing ratio described herein means that the proportion of the refrigerant in the mixture 2 is 0-100%, that is, there may be no refrigerant, a certain proportion of the refrigerant, and all Refrigerants.
一个传感器3被安装在压缩机1的外壳上。该传感器3采用电容检测原理进行检测。传感器3的头部能够测量在压缩机1内部的底端处的成某一混合比例的润滑油与制冷剂的混合物2的介电常数，进而获得对应的相对介电常数，从而可以基于预先确定的不同混合比例的同一润滑油与同一制冷剂的混合物2的润滑油稀释度与相应的相对介电常数的拟合关系计算获得此时与所述传感器测量的所述液体的相对介电常数对应的润滑油稀释度。A sensor 3 is mounted on the outer casing of the compressor 1. The sensor 3 is detected by the principle of capacitance detection. The head of the sensor 3 is capable of measuring the dielectric constant of the mixture 2 of the lubricating oil and the refrigerant at a certain mixing ratio at the bottom end of the inside of the compressor 1, thereby obtaining a corresponding relative dielectric constant, which can be determined based on a predetermined The relationship between the dilution of the lubricating oil of the mixture of the same lubricating oil and the same refrigerant of the same refrigerant and the corresponding relative dielectric constant is calculated to obtain the relative dielectric constant of the liquid measured by the sensor at this time. Lubricating oil dilution.
再次参见图1，所图示的油位处于正常状态，传感器3的头部会完全浸没在润滑油或润滑油和制冷剂的混合物2中，从而能够测量此时的润滑油或润滑油和制冷剂的混合物2的介电常数或相对介电常数。Referring again to Figure 1, the illustrated oil level is in a normal state, and the head of the sensor 3 is completely submerged in the lubricating oil or the mixture of lubricating oil and refrigerant 2, thereby being able to measure the lubricating oil or lubricating oil and cooling at this time. The dielectric constant or relative dielectric constant of the mixture 2 of the agents.
当压缩机开始运行后，一些制冷剂会进入到润滑油中，而稀释润滑油2。这样的稀释将会改变润滑油的相对介电常数。因此，该相对介电常数的变化可以用来监测润滑油的稀释度的变化。When the compressor starts running, some of the refrigerant will enter the lubricating oil and dilute the lubricating oil 2. Such dilution will change the relative dielectric constant of the lubricating oil. Therefore, this change in relative dielectric constant can be used to monitor changes in the dilution of the lubricating oil.
如图3所示，传感器的头部30包括中间铜柱31、和包围铜柱31且与铜柱31间隔开的外层套筒32，其中润滑油从铜柱31和外层套筒32之间的空间沿着箭头所示的方向流过。传感器的头部的长度为L，真空的介电常数为ε0，润滑油和制冷剂的混合物的相对介电常数为εr，外层套筒32的内径为R和中间铜柱31的外径为r，其中 电容
Figure PCTCN2016081256-appb-000002
As shown in FIG. 3, the head 30 of the sensor includes an intermediate copper post 31, and an outer sleeve 32 surrounding the copper post 31 and spaced apart from the copper post 31, wherein the lubricating oil is from the copper post 31 and the outer sleeve 32. The space between them flows in the direction indicated by the arrow. The length of the head of the sensor is L, the dielectric constant of the vacuum is ε 0 , the relative dielectric constant of the mixture of lubricating oil and refrigerant is ε r , and the inner diameter of the outer sleeve 32 is R and the outer copper column 31 is outside. The diameter is r, where the capacitance
Figure PCTCN2016081256-appb-000002
通过图4所示的附图以及上述的公式可以预先得到各种不同混合比例的润滑油与制冷剂的混合物的润滑油稀释度与相应的相对介电常数的关系。The relationship between the dilution of the lubricating oil of the mixture of the lubricating oil and the refrigerant of various mixing ratios and the corresponding relative dielectric constant can be obtained in advance by the drawings shown in FIG. 4 and the above formula.
在润滑油为PVE68，制冷剂为R410A时，不同工况下的润滑油相对介电常数和润滑油溶解度(稀释度)已经被测量完成(例如在实验室中)。上述二者之间的关系如图4所示。在图4所示的曲线中，可以看出随着润滑油和制冷剂的稀释度的增加，相对介电常数也相应地上升。在这种情况下，预先确定的润滑油稀释度x与相应的相对介电常数y之间的函数关系为：When the lubricating oil is PVE68 and the refrigerant is R410A, the relative dielectric constant and lubricating oil solubility (dilution) of the lubricating oil under different working conditions have been measured (for example, in the laboratory). The relationship between the two is shown in Figure 4. In the graph shown in Fig. 4, it can be seen that as the dilution of the lubricating oil and the refrigerant increases, the relative dielectric constant also rises accordingly. In this case, the predetermined relationship between the dilution d of the lubricating oil and the corresponding relative permittivity y is:
y＝0.0003x2+0.0416x+2.8374，其中x的取值范围为0％-100％。y=0.0003x 2 +0.0416x+2.8374, where x ranges from 0% to 100%.
通过测量某一工况下(例如某一混合比例)的润滑油与制冷剂的混合物的相对介电常数，依据上述的公式，可以计算获得与该相对介电常数相对应的润滑油稀释度。一旦发现润滑油稀释度的测量值高于上限值，那么压缩机的控制单元会立即响应，停止压缩机的运转，或者通过适当的方法使得润滑油中的制冷剂蒸发出去。By measuring the relative dielectric constant of a mixture of lubricating oil and refrigerant under a certain operating condition (for example, a certain mixing ratio), according to the above formula, the dilution of the lubricating oil corresponding to the relative dielectric constant can be calculated. Once the measured value of the dilution of the lubricating oil is found to be above the upper limit, the control unit of the compressor will respond immediately, stop the operation of the compressor, or evaporate the refrigerant in the lubricating oil by an appropriate method.
可替代地，还可以获得在润滑油为160SZ和制冷剂为R410A的情况下，不同混合比例的润滑油与制冷剂的混合物2的润滑油稀释度与相应的相对介电常数的关系。从而可以计算此种情况下的润滑油稀释度。Alternatively, it is also possible to obtain a relationship between the dilution ratio of the lubricating oil of the mixture 2 of the lubricating oil and the refrigerant of different mixing ratios and the corresponding relative dielectric constant in the case where the lubricating oil is 160 SZ and the refrigerant is R410A. Thus, the dilution of the lubricating oil in this case can be calculated.
另外，需要说明的是本发明所述的方法还可以用于检测润滑油的油位是否正常。油位是另外一个非常重要的因素，它直接关系到压缩机的寿命。如果油位过低，例如非常高的OCR引起的，压缩机内将会没有足够的润滑油来润滑。这将在非常短的时间内毁坏压缩机。因此压缩机的油位必须也要被实时在线监测，一旦发现油位低于最低报警值，立刻关闭压缩机。In addition, it should be noted that the method of the present invention can also be used to detect whether the oil level of the lubricating oil is normal. The oil level is another very important factor that is directly related to the life of the compressor. If the oil level is too low, such as caused by a very high OCR, there will not be enough lubricant in the compressor to lubricate. This will destroy the compressor in a very short time. Therefore, the oil level of the compressor must also be monitored online in real time. Once the oil level is found to be below the minimum alarm value, the compressor is shut down immediately.
油位测量方法包括使用浮球干簧管的方法。另外，光电式的开关被广泛地用于测量油位。对于油位测量，当前的方法都存在一些缺陷，比如，对于压缩机应用，内部的压力可以达到45bar足以损坏或者令干簧管开关上的浮球变形，而润滑油里面的泡沫也会干扰光电式开关，从而令该光电式开关误判断油位。The oil level measurement method includes a method of using a float reed switch. In addition, photoelectric switches are widely used to measure oil levels. For oil level measurement, current methods have some drawbacks. For example, for compressor applications, the internal pressure can reach 45 bar enough to damage or deform the float on the reed switch, and the foam inside the lubricant can also interfere with the photoelectric The switch causes the photoelectric switch to misjudge the oil level.
由于高的OCR或其它原因，导致压缩机内的油位低于最低下限。此时，传感器3的头部暴露在气态制冷剂中，如图2所示。The oil level in the compressor is below the minimum lower limit due to high OCR or other reasons. At this time, the head of the sensor 3 is exposed to the gaseous refrigerant as shown in FIG.
对于润滑油的油位监测，可以进行如下述的表1所述的测试。在所述测试中，润滑油为160SZ和制冷剂为R410A。在不同工况下的纯气态、纯液态、饱和态、纯润 滑油以及润滑油与制冷剂的混合物的相对介电常数均被测量。For oil level monitoring of lubricating oil, the tests described in Table 1 below can be performed. In the test, the lubricating oil was 160 SZ and the refrigerant was R410A. Pure gaseous, pure liquid, saturated, pure under different working conditions The relative dielectric constants of the oil and the mixture of lubricating oil and refrigerant are measured.
表1在各种工况下的相对介电常数表Table 1 Table of relative dielectric constants under various operating conditions
Figure PCTCN2016081256-appb-000003
Figure PCTCN2016081256-appb-000003
根据以上的结果可以看出，如果润滑油的油位正常时，传感器3的头部被完全浸没在润滑油或者润滑油和制冷剂的混合物中。此时相对介电常数的值会大于3.14。如果润滑油的油位不正常(低于下限值)，传感器3的头部会暴露在气态制冷剂中，此时相对介电常数会低于1.46。在这两种情况下(油位正常和不正常)，相对介电常数有比较大的区别。压缩机1内的控制单元可以利用这一性质在测量润滑油的稀释度的同时检测油位。From the above results, it can be seen that if the oil level of the lubricating oil is normal, the head of the sensor 3 is completely immersed in the lubricating oil or the mixture of the lubricating oil and the refrigerant. At this time, the value of the relative dielectric constant will be greater than 3.14. If the oil level of the lubricating oil is abnormal (below the lower limit), the head of the sensor 3 will be exposed to the gaseous refrigerant, and the relative dielectric constant will be lower than 1.46. In both cases (normal and abnormal oil levels), there is a large difference in relative dielectric constant. The control unit in the compressor 1 can utilize this property to detect the oil level while measuring the dilution of the lubricating oil.
在本发明的另一实施例中，还提供了使用上述的方法进行润滑油稀释度测量的传感器3，该传感器3包括：In another embodiment of the invention, there is also provided a sensor 3 for performing a dilution measurement of lubricating oil using the method described above, the sensor 3 comprising:
检测头，沿水平方向插入到压缩机1的油池内，并且配置成检测所述油池内的液体的相对介电常数；a detecting head inserted into the oil pool of the compressor 1 in a horizontal direction and configured to detect a relative dielectric constant of the liquid in the oil pool;
第一计算单元，配置成根据所述相对介电常数计算所述液体的油稀释度；a first calculating unit configured to calculate an oil dilution of the liquid according to the relative dielectric constant;
第二计算单元，配置成根据所述相对介电常数显示所述油池内的油位是否低于或高于所述检测头。And a second calculating unit configured to display whether the oil level in the oil pool is lower or higher than the detecting head according to the relative dielectric constant.
具体地，传感器3设置在压缩机1的外壳上，该传感器的头部或检测头能够测量在该压缩机1内部的油池内的液体的相对介电常数，进而基于预先确定的不同混合比例的同一润滑油与同一制冷剂的混合物的润滑油稀释度与相应的相对介电常数的拟合 关系计算获得与所述传感器测量的所述液体的相对介电常数对应的润滑油稀释度，其中，所述液体为润滑油或者润滑油与制冷剂的混合物2。Specifically, the sensor 3 is disposed on the outer casing of the compressor 1, and the head or the detecting head of the sensor is capable of measuring the relative dielectric constant of the liquid in the oil pool inside the compressor 1, and further based on a predetermined different mixing ratio Fitting the dilution of lubricating oil of the same lubricating oil with the same refrigerant and the corresponding relative dielectric constant The relationship calculation obtains a dilution of the lubricating oil corresponding to the relative dielectric constant of the liquid measured by the sensor, wherein the liquid is a lubricating oil or a mixture 2 of lubricating oil and refrigerant.
如图3所示，该传感器3的头部30包括中间铜柱31、和包围该铜柱31且与该铜柱31间隔开的外层套筒32，其中润滑油从该铜柱31和外层套筒32之间的空间流过。As shown in FIG. 3, the head 30 of the sensor 3 includes an intermediate copper post 31, and an outer sleeve 32 surrounding the copper post 31 and spaced apart from the copper post 31, wherein the lubricating oil is from the copper post 31 and outside. The space between the layer sleeves 32 flows.
该传感器3的第二计算单元(未示出)基于所检测的相对介电常数，在测量该润滑油稀释度的同时，检测压缩机内的润滑油的油位是否正常。The second calculating unit (not shown) of the sensor 3 detects whether the oil level of the lubricating oil in the compressor is normal while measuring the dilution of the lubricating oil based on the detected relative dielectric constant.
如果所检测的介电常数大于所述油池内的液体在液态下的相对介电常数，则第二计算单元显示压缩机内的油位正常；If the detected dielectric constant is greater than the relative dielectric constant of the liquid in the oil pool in the liquid state, the second calculating unit indicates that the oil level in the compressor is normal;
如果所检测的介电常数小于所述油池内的液体在气态下的相对介电常数，则第二计算单元显示压缩机内的油位不正常。If the detected dielectric constant is less than the relative dielectric constant of the liquid in the sump in the gaseous state, the second calculation unit indicates that the oil level in the compressor is abnormal.
另外，本发明还提供了一种压缩机，包括根据上述任何一实施例所述的传感器。Further, the present invention provides a compressor comprising the sensor according to any of the above embodiments.
在本发明中，通过测量润滑油和制冷剂的混合物的相对介电常数，来至少获得润滑油的稀释度或油位，甚至同时获得上述两者。In the present invention, at least the dilution or oil level of the lubricating oil is obtained by measuring the relative dielectric constant of the mixture of the lubricating oil and the refrigerant, and even both of them are obtained at the same time.
以上仅为本发明的一些实施例，本领域普通技术人员将理解，在不背离本总体发明构思的原则和精神的情况下，可对这些实施例做出改变，本发明的范围以权利要求和它们的等同物限定。 The above is only some embodiments of the present invention, and those skilled in the art will understand that the embodiments may be modified without departing from the spirit and spirit of the present general inventive concept. Their equivalents are defined.

Claims (16)

  1. 一种测量压缩机的润滑油稀释度的方法，包括：A method of measuring the dilution of a lubricating oil of a compressor, comprising:
    设置在压缩机的外壳上的传感器的头部测量在所述压缩机内部的油池内的液体的相对介电常数；A head of a sensor disposed on a casing of the compressor measures a relative dielectric constant of a liquid in an oil sump inside the compressor;
    基于预先确定的不同混合比例的同一润滑油与同一制冷剂的混合物的润滑油稀释度与相应的相对介电常数的拟合关系计算获得与所述传感器测量的所述液体的相对介电常数对应的润滑油稀释度；其中，所述液体为润滑油或者润滑油与制冷剂的混合物。Calculating a relative dielectric constant of the liquid measured by the sensor based on a fitting relationship between a dilution degree of the lubricating oil of the same lubricating oil and a mixture of the same refrigerant and a corresponding relative dielectric constant based on a predetermined different mixing ratio Lubricating oil dilution; wherein the liquid is a lubricating oil or a mixture of lubricating oil and a refrigerant.
  2. 根据权利要求1所述的方法，还包括：根据所述相对介电常数的变化来监测所述润滑油的稀释度的变化。The method of claim 1 further comprising monitoring a change in dilution of said lubricating oil based on said change in relative dielectric constant.
  3. 根据权利要求1-2中任一项所述的方法，其中，所述传感器的头部包括中间铜柱、和包围所述铜柱且与所述铜柱间隔开的外层套筒，其中润滑油从所述铜柱和外层套筒之间的空间流过。A method according to any one of claims 1 to 2, wherein the head of the sensor comprises an intermediate copper post, and an outer sleeve surrounding the copper post and spaced apart from the copper post, wherein lubrication Oil flows through the space between the copper post and the outer sleeve.
  4. 根据权利要求3所述的方法，其中，所述传感器的头部的长度为L，真空的介电常数为ε0，润滑油和制冷剂的混合物的相对介电常数为εr，外层套筒的内径为R和中间铜柱的外径为r，其中电容与相对介电常数的关系为：The method according to claim 3, wherein the head of the sensor has a length L, the dielectric constant of the vacuum is ε 0 , the relative dielectric constant of the mixture of the lubricating oil and the refrigerant is ε r , and the outer sleeve The inner diameter of the cylinder is R and the outer diameter of the intermediate copper cylinder is r, wherein the relationship between the capacitance and the relative dielectric constant is:
    Figure PCTCN2016081256-appb-100001
    Figure PCTCN2016081256-appb-100001
  5. 根据权利要求4所述的方法，其中，所述润滑油为PVE68，制冷剂为R410A，所述预先确定的润滑油稀释度x与相应的相对介电常数y之间的函数关系为：The method of claim 4 wherein said lubricating oil is PVE 68 and the refrigerant is R410A, said predetermined lubricating oil dilution x being a function of a corresponding relative dielectric constant y:
    y＝0.0003x2+0.0416x+2.8374，其中x的取值范围为0％-100％。y=0.0003x 2 +0.0416x+2.8374, where x ranges from 0% to 100%.
  6. 根据权利要求4所述的方法，其中，所述润滑油为160SZ，制冷剂为R410A。 The method of claim 4 wherein said lubricating oil is 160 SZ and the refrigerant is R410A.
  7. 根据权利要求1-6中任一项所述的方法，还包括：基于所检测的相对介电常数，在测量所述润滑油稀释度的同时，检测压缩机内的润滑油的油位是否正常。The method according to any one of claims 1 to 6, further comprising: detecting whether the oil level of the lubricating oil in the compressor is normal while measuring the dilution of the lubricating oil based on the detected relative dielectric constant .
  8. 根据权利要求7所述的方法，其中，如果所检测的介电常数大于所述油池内的液体在液态下的相对介电常数，则压缩机内的油位正常；The method according to claim 7, wherein if the detected dielectric constant is greater than a relative dielectric constant of the liquid in the oil pool in a liquid state, the oil level in the compressor is normal;
    如果所检测的介电常数小于所述油池内的液体在气态下的相对介电常数，则压缩机内的油位不正常。If the measured dielectric constant is less than the relative dielectric constant of the liquid in the sump in the gaseous state, the oil level in the compressor is abnormal.
  9. 根据权利要求8所述的方法，其中，所述油池内的液体在液态下的相对介电常数为3.14；The method according to claim 8, wherein the liquid in the oil bath has a relative dielectric constant of 3.14 in a liquid state;
    所述油池内的液体在气态下的相对介电常数为1.46。The relative dielectric constant of the liquid in the oil bath in the gaseous state was 1.46.
  10. 一种传感器，包括：A sensor comprising:
    检测头，所述检测头沿水平方向插入到压缩机的油池内，并且配置成检测所述油池内的液体的相对介电常数；a detecting head inserted into the oil sump of the compressor in a horizontal direction and configured to detect a relative dielectric constant of the liquid in the oil sump;
    第一计算单元，配置成根据所述相对介电常数计算所述液体的油稀释度；a first calculating unit configured to calculate an oil dilution of the liquid according to the relative dielectric constant;
    第二计算单元，配置成根据所述相对介电常数显示所述油池内的油位是否低于或高于所述检测头。And a second calculating unit configured to display whether the oil level in the oil pool is lower or higher than the detecting head according to the relative dielectric constant.
  11. 根据权利要求10所述的传感器，其中，The sensor according to claim 10, wherein
    所述传感器设置在压缩机的外壳上，所述传感器的头部测量在所述压缩机内部的油池内液体的相对介电常数，进而基于预先确定的不同混合比例的同一润滑油与同一制冷剂的混合物的润滑油稀释度与相应的相对介电常数的拟合关系计算获得与所述传感器测量的所述液体的相对介电常数对应的润滑油稀释度，其中，所述液体为润滑油或者润滑油与制冷剂的混合物。The sensor is disposed on a casing of the compressor, the head of the sensor measuring a relative dielectric constant of the liquid in the oil pool inside the compressor, and further based on the same lubricating oil and the same refrigerant based on a predetermined different mixing ratio Calculating a fitting relationship between the dilution of the lubricating oil of the mixture and the corresponding relative dielectric constant to obtain a dilution of the lubricating oil corresponding to the relative dielectric constant of the liquid measured by the sensor, wherein the liquid is lubricating oil or a mixture of lubricating oil and refrigerant.
  12. 根据权利要求11所述的传感器，其中，所述传感器的头部包括中间铜柱、和包围所述铜柱且与所述铜柱间隔开的外层套筒，其中润滑油从所述铜柱和外层套筒之间的空间流过。 The sensor according to claim 11, wherein the head of the sensor comprises an intermediate copper post, and an outer sleeve surrounding the copper post and spaced apart from the copper post, wherein lubricating oil is from the copper post The space between the outer sleeve and the outer sleeve flows.
  13. 根据权利要求10-12中任一项所述的传感器，其中，所述传感器的第二计算单元基于所检测的相对介电常数，在测量所述润滑油稀释度的同时，检测压缩机内的润滑油的油位是否正常。The sensor according to any one of claims 10 to 12, wherein the second calculating unit of the sensor detects the inside of the compressor while measuring the dilution of the lubricating oil based on the detected relative dielectric constant Whether the oil level of the lubricating oil is normal.
  14. 根据权利要求13所述的传感器，其中，如果所检测的相对介电常数大于所述油池内的液体在液态下的相对介电常数，则第二计算单元显示压缩机内的油位正常；The sensor according to claim 13, wherein if the detected relative dielectric constant is greater than a relative dielectric constant of the liquid in the oil pool in a liquid state, the second calculating unit indicates that the oil level in the compressor is normal;
    如果所检测的介电常数小于所述油池内的液体在气态下的相对介电常数，则第二计算单元显示压缩机内的油位不正常。If the detected dielectric constant is less than the relative dielectric constant of the liquid in the sump in the gaseous state, the second calculation unit indicates that the oil level in the compressor is abnormal.
  15. 一种检测压缩机内的油位是否正常的方法，包括：A method of detecting whether the oil level in a compressor is normal, including:
    检测压缩机油池内液体的相对介电常数；Detecting the relative dielectric constant of the liquid in the compressor oil sump;
    基于所检测的相对介电常数，检测压缩机的油池内的润滑油的油位是否正常；Detecting whether the oil level of the lubricating oil in the oil pool of the compressor is normal based on the detected relative dielectric constant;
    如果所检测的相对介电常数大于所述油池内的液体在液态下的相对介电常数，则显示压缩机内的油位正常；If the relative dielectric constant detected is greater than the relative dielectric constant of the liquid in the oil pool in the liquid state, then the oil level in the compressor is normal;
    如果所检测的介电常数小于所述油池内的液体在气态下的相对介电常数，则显示压缩机内的油位不正常。If the measured dielectric constant is less than the relative dielectric constant of the liquid in the sump in the gaseous state, then the oil level in the compressor is not normal.
  16. 一种压缩机，包括根据权利要求10-14中任一项所述的传感器。 A compressor comprising the sensor of any of claims 10-14.
PCT/CN2016/081256 2015-05-08 2016-05-06 Method for measuring dilution degree of lubricating oil, sensor, and method for detecting oil level WO2016180276A1 (en)

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