System for monitoring state of refrigerant oil in oil pool during operation of compressor

Abstract

The invention relates to the related technical field of monitoring the state and parameters of refrigeration oil in an oil pool inside a running compressor, in particular to a system for monitoring the state of refrigeration oil in the oil pool when the compressor runs. The compressor is connected with a condenser and an evaporator through copper pipes to form a loop; the system for monitoring the state of refrigeration oil in the oil pool during operation of the compressor is connected with the compressor through a copper pipe; the system comprises an oil viscosity monitoring module, an oil concentration monitoring module, an oil state monitoring module and an oil operation parameter monitoring module. According to the technical scheme, the problems that in the prior art, the state of refrigerant oil in an oil pool in a compressor cannot be monitored and analyzed, so that the state of the refrigerant oil in the oil pool cannot be accurately evaluated, and the reliability evaluation of the compressor cannot be supported are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of monitoring the state and parameters of refrigeration oil in the internal oil pool of a running compressor, and particularly relates to a system for monitoring the state of refrigeration oil in the oil pool during the running of a compressor. BACKGROUND

[0002] A compressor is a core component of an air conditioning system, and its reliability, stability and high efficiency are the most important key elements for guaranteeing an air conditioning system. The most important thing for guaranteeing the high-efficiency and reliable running of a compressor is how to guarantee that the refrigeration lubricating oil in the oil pool of the compressor is always within the range of design parameters. The evaluation of the state and parameters of refrigeration lubricating oil is the most direct judgment of the qualification of the lubrication, cooling and sealing of the internal mechanical components of a compressor, and therefore it is particularly important for a compressor to directly monitor the state and parameters of refrigeration oil in the oil pool of a running compressor in an air conditioning system. However, in actual situations, a unit manufacturer cannot monitor and analyze the state of refrigeration oil in the internal oil pool of a compressor when doing the reliability of the whole machine, and can only judge the running state of an air conditioning system through the discharge superheat, the superheat of an evaporator and the superheat of a gas-liquid separator, but cannot monitor the refrigeration oil in the oil pool. The data of an air conditioning unit and the state and parameters of refrigeration oil in the oil pool are not directly corresponding, and therefore the state of refrigeration oil in the oil pool cannot be accurately evaluated, and the reliability of a compressor cannot be supported.

[0003] In view of the problems in the prior art, it is necessary to design a new system for monitoring the state of refrigeration oil in the oil pool of a running compressor to overcome the problems in the prior art. SUMMARY

[0004] The prior art cannot monitor and analyze the state of refrigeration oil in the internal oil pool of a compressor, and therefore cannot accurately evaluate the state of refrigeration oil in the oil pool and support the reliability evaluation of a compressor. The present application provides a system for monitoring the state of refrigeration oil in the oil pool of a running compressor. The technical means adopted by the present application are as follows. A system for monitoring the state of refrigeration oil in the oil pool of a running compressor comprises a compressor, and the compressor is connected with a condenser and an evaporator through copper pipes to form a loop. Further, the system for monitoring the state of refrigeration oil in the oil pool of a running compressor is connected with the compressor through copper pipes. Further, the system comprises an oil viscosity monitoring module, an oil concentration monitoring module, an oil state monitoring module and an oil running parameter monitoring module. Further, the oil viscosity monitoring module is connected with the sampling pipe at the bottom of the compressor oil pool through a copper pipe and is electrically connected with the oil operation parameter monitoring module, so as to collect the oil viscosity in the compressor and directly transmit the oil viscosity to the oil operation parameter monitoring module for real-time observation by the monitoring personnel. Further, the oil concentration monitoring module is connected with the sampling pipe at the bottom of the compressor oil pool through a copper pipe and is electrically connected with the oil operation parameter monitoring module, so as to collect the refrigerant oil sample in the oil pool at any time and obtain the oil concentration parameter at the sampling time through calculation. Further, the oil state monitoring module is connected with the sight glass on the compressor and collects the real-time operation state of the refrigerant oil in the sight glass, and transmits the data to the oil operation parameter monitoring module for real-time observation by the monitoring personnel. Further, the oil operation parameter monitoring module is connected with the compressor and monitors the operation parameters of the refrigerant oil in the compressor oil pool in the running state in real time.

[0005] Further, the oil viscosity monitoring module comprises an oil viscosity monitoring stop valve and a viscosity sampler connected by a copper pipe. Further, the copper pipe at the front end of the oil viscosity monitoring stop valve is connected with the sampling pipe, and a filter, a refrigerant oil needle valve and an oil pool pressure sensor are sequentially arranged on the copper pipe. Further, the viscosity sampler is connected with the oil operation parameter monitoring module through a data line, and the data collected by the viscosity sampler is transmitted to the oil operation parameter monitoring module for real-time observation by the monitoring personnel.

[0006] Further, the oil concentration monitoring module comprises an oil concentration module stop valve, a concentration sampling device pressure sensor, a sight glass, an oil concentration sampling tank and a vacuum needle valve connected by a copper pipe. Further, the copper pipe at the front end of the oil concentration module stop valve is connected with the copper pipes between the refrigerant oil needle valve and the oil pool pressure sensor. Further, a sampling low-pressure switch and an oil concentration sampling stop valve are sequentially arranged on the copper pipe at the front end of the oil concentration module stop valve. Further, the concentration sampling device pressure sensor is connected with the oil operation parameter monitoring module through a data line, so as to calculate the refrigerant oil sample collected in the oil pool at any time and obtain the oil concentration parameter at the sampling time. Further, a drain stop valve is arranged on the copper pipe at the rear end of the vacuum needle valve.

[0007] Further, the oil state monitoring module comprises a sight glass arranged on the compressor and a video collector connected with the oil operation parameter monitoring module through a data line. Further, the sight glass collects the real-time running state of the refrigeration oil in the compressor, and transmits the real-time running state to the video collector, and then the video collector transmits the real-time running state to the oil running parameter monitoring module, so that the tester can observe in real time.

[0008] Further, the main body of the oil running parameter monitoring module is a centralized monitor. Further, the centralized monitor is connected with an oil pool temperature sensor arranged at the bottom of the compressor oil pool, a compressor suction port temperature sensor arranged at the compressor suction port, and an oil pool pressure sensor, to monitor the running parameters of the refrigeration oil in the compressor oil pool in real time. Further, the centralized monitor is also connected with the sampling low-pressure switch, the viscosity sampler, and the concentration sampling device pressure sensor through data lines, so that the tester can observe the related data in real time.

[0009] Further, the oil running parameter monitoring module receives the data transmitted by each module, and calculates the values of the compressor suction port superheat and the compressor oil pool superheat. Further, the calculation formula of the compressor suction port superheat is: Compressor suction port superheat = value of the compressor suction port temperature sensor - corresponding saturated temperature of the value of the oil pool pressure sensor. Further, the value of the compressor suction port superheat is required to be greater than or equal to K. Further, the calculation formula of the compressor oil pool superheat is: Further, oil pool superheat = value of the oil pool temperature sensor - corresponding saturated temperature of the value of the oil pool pressure sensor. Further, the value of the compressor oil pool superheat is required to be greater than or equal to K.

[0010] Further, the oil concentration monitoring module is applied to the steady state region of the compressor operation, and the oil concentration value can be accurately calculated by calculation. The calculation formula of the oil concentration monitoring module is: Oil concentration value = [ (W5-W4) + (W3-W1) ] / (W2-W1). Wherein: W1 - weight before sampling of the sampling device, unit: g; W2 - weight after collecting the solution sample, unit: g; W3 - empty weight of the sample in the sampling device, unit: g; W4 - weight of the receiving sample device when not in use, unit: g; W5 - weight of the receiving sample device after excluding the refrigerant, unit: g.

[0011] Further, the oil viscosity monitoring module is applied to the non-steady state area of the compressor operation, and the output viscosity and the value of the oil pool temperature sensor at the bottom of the oil pool are used to calculate the oil concentration in the oil pool through a Daniel curve.

[0012] Compared with the prior art, the present application has the following advantages: 1. The system for monitoring the state of refrigeration oil in an oil pool during operation of a compressor provided by the present application is connected to the compressor, thereby achieving monitoring of the operating state and parameters of the refrigeration oil in the oil pool.

[0013] 2. The system for monitoring the state of refrigeration oil in an oil pool during operation of a compressor provided by the present application achieves visual monitoring of the refrigeration oil in the oil pool inside the compressor, and through the combination of a sight glass and a video collector, real-time visual monitoring of the state of the refrigeration oil during operation of the compressor is achieved for the first time, thereby completely changing the limitation of traditional technologies that can only infer the operating state through indirect parameters (such as discharge superheat).

[0014] 3. The system for monitoring the state of refrigeration oil in an oil pool during operation of a compressor provided by the present application achieves synchronous acquisition of multiple parameters of the refrigeration oil in the oil pool inside the compressor, integrates monitoring of parameters such as viscosity, concentration, temperature, and pressure, can synchronously acquire the physical and chemical properties and operating parameters of the refrigeration oil, and forms a complete oil state evaluation system.

[0015] 4. The system for monitoring the state of refrigeration oil in an oil pool during operation of a compressor provided by the present application greatly improves the precision of data acquisition, analysis, and visual monitoring, and can achieve a direct measurement error of less than ±1.5%. Traditional technologies analyze the state of the oil pool inside the compressor by speculation, and the indirect calculation error is large and the conclusion has no actual data support. The present application directly uses data and images to analyze real operating data, thereby providing accurate data support for technical personnel.

[0016] 5. The system for monitoring the state of refrigeration oil in an oil pool during operation of a compressor provided by the present application can achieve real-time transmission of data acquisition and analysis response speed with a delay of less than 1 second. Compared with traditional schemes that rely on speculation analysis, the conclusion lags at least 5-10 minutes. Because the state of the refrigeration oil in the oil pool changes in real time with the operation of the compressor, data lagging for 5 minutes cannot be accurately analyzed and used.

[0017] 6. The system for monitoring the state of refrigeration oil in an oil pool during operation of a compressor provided by the present application can collect data with a wide dimension, and integrates 4 types of 12 parameters. Traditional schemes generally only monitor temperature or pressure and cannot perform systematic analysis, and thus cannot obtain comprehensive test conclusions.

[0018] 7、The system for monitoring the state of refrigeration oil in the oil pool during the operation of the compressor provided by the application can provide quantifiable standard data collection during actual application, greatly improves the reliability guarantee, and can predict the failure risk that may occur during the operation of the compressor in advance, so that the failure rate is reduced by more than 40%.

[0019] 8、The system for monitoring the state of refrigeration oil in the oil pool during the operation of the compressor provided by the application has very low maintenance cost during testing, can effectively avoid the waste caused by regular oil replacement in the traditional testing method, and can reduce 30% of the maintenance working hours and 25% of the refrigeration oil consumption.

[0020] 9、The system for monitoring the state of refrigeration oil in the oil pool during the operation of the compressor provided by the application is modularized, supports seamless docking with the existing air conditioner control system, is built in the copper pipe sampling loop and sensor mode, and does not need to modify the internal main structure of the compressor.

[0021] In summary, the application solves the long-standing problem of evaluating the lubrication state of the compressor through the innovative multi-module cooperative monitoring system, and achieves a significant breakthrough in monitoring accuracy, system reliability and economy. The technical scheme of the application solves the problem that the state of refrigeration oil in the internal oil pool of the compressor cannot be monitored and analyzed in the prior art, so the state of the refrigeration oil in the oil pool cannot be accurately evaluated, and the reliability evaluation of the compressor cannot be supported. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme in the embodiments of the application or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0023] Figure 1 It is a schematic diagram of the system of the application.

[0024] In the figure: 1, compressor 2, sight glass 3, sampling pipe 4, filter 5, refrigeration oil filling needle valve 6, oil pool pressure sensor 7, sampling low pressure switch 8, oil concentration sampling stop valve 9, oil concentration module stop valve 10, concentration sampling device pressure sensor 11, sight glass 12, oil concentration sampling tank 13, vacuumizing needle valve 14, oil discharge stop valve 15, oil viscosity monitoring stop valve 16, viscosity collector 17, video collector 18, compressor suction port temperature sensor 19, oil pool temperature sensor 20, centralized monitor. DETAILED DESCRIPTION

[0025] It should be noted that the embodiments and features of the present application can be combined with each other, if there is no conflict. The present application will be described in detail below with reference to the drawings and in conjunction with embodiments.

[0026] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application. The description of the at least one exemplary embodiment below is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0027] It should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a presence of the features, steps, operations, devices, components and / or combinations thereof.

[0028] Unless specifically stated otherwise, the relative arrangements of the components and steps illustrated in these embodiments and the numerical expressions and values set forth herein are not meant to limit the scope of the present application. It should also be understood that the size of the various parts shown in the figures can not be to scale, and that the drawings are intended to conceptually illustrate the structures and procedures described herein. The techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered as part of the description of the present application. In all examples shown and discussed herein, any specific value should be interpreted as merely illustrative, and not as a limitation. Therefore, other examples of the exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0029] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or positional relationship are generally based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, without the opposite statement, these orientation words do not indicate and imply that the indicated device or element must have a particular orientation or be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the scope of protection of the present application: the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0030] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper" and the like can be used herein to describe the spatial positional relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0031] In addition, it should be noted that the use of the words "first", "second" and the like to define parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, therefore it cannot be understood as a limitation on the scope of protection of the present application.

[0032] As shown in the figure, the present application provides a system which can monitor the state and parameters of refrigeration oil in the oil pool when the compressor is running. The device integrates four functional modules, which are oil concentration monitoring module, oil viscosity monitoring module, oil state monitoring module and oil running parameter monitoring module. The oil concentration monitoring module includes oil concentration module stop valve 9, concentration sampling device pressure sensor 10, sight glass 11, oil concentration sampling tank 12, vacuum extraction needle valve 13 and oil discharge stop valve 14; the oil viscosity monitoring module includes oil viscosity monitoring stop valve 15 and viscosity collector 16; the oil state monitoring module includes sight glass 2 and video collector 17; the oil running parameter monitoring module includes oil pool pressure sensor 6, sampling low pressure switch 7, concentration sampling device pressure sensor 10, compressor suction port temperature sensor 18, oil pool temperature sensor 19 and centralized monitor 20.

[0033] 4 modules run simultaneously, can be real-time measurement and record the oil amount, oil concentration, oil viscosity, oil temperature, oil pressure, oil state when the compressor is running.

[0034] Oil concentration monitoring module and oil viscosity monitoring module need to be directly connected through sampling tube 3 and compressor 1 bottom oil pool, in order to protect the system from impurities, install the filter 4, the filter 4 specification for internal steel frame filter screen, mesh number 60; In order to protect the sampling process does not occur leakage or appear low pressure over low, also install the sampling low pressure switch 7, the sampling low pressure switch 7 specification for cutting 0.05Mpa, into 0.10Mpa; In order to protect the frequent sampling of oil pool, install the refrigerant oil needle valve 5, refrigerant oil needle valve 5 specification for Φ6.35mm, can be directly connected to the oil device, to facilitate the operation of oil as needed.

[0035] Among them, the oil concentration monitoring module can be disassembled and installed from the monitoring system through the oil concentration sampling stop valve 8, so as to measure the oil concentration of the collected sample, and the structure thereof is composed of oil concentration module stop valve 9, concentration sampling device pressure sensor 10, sight glass 11, oil concentration sampling tank 12, vacuum needle valve 13 and oil discharge stop valve 14, and each part is welded in turn by welding, wherein the concentration sampling device pressure sensor 10 functions to judge whether the sampler is full by measuring the pressure inside the sampler, and to judge the state of the sampling tank by monitoring the pressure when the sample is discharged and vacuumized, and the sampling can be carried out when the vacuum degree reaches 0.05Torr. When the oil concentration sampling stop valve 8 and the oil concentration module stop valve 9 are opened to collect the oil sample, the pressure collected by the concentration sampling device pressure sensor 10 reaches the low pressure of the air conditioning system, and the sampling is completed.

[0036] Oil state monitoring module, need to install sight glass 2 on the compressor oil pool in advance, the sight glass 2 specification for the outer diameter of 60mm, install video collector 17 outside, the video collector 17 specification for color 1080P, with macro photography function, fixed on the front of the sight glass by bracket, if the light is insufficient, can install LED light belt; The monitoring equipment should have recording function, and should be clear and reliable under the ambient temperature of high temperature 60℃, high humidity 95%, low temperature-50℃. A scale should also be installed on the edge of the sight glass, so as to accurately record the oil level and state of the oil in the sight glass.

[0037] Installation points: the sampling tube 3 should be installed at the lowest point of the compressor 1 oil pool, and the sampling tube 3 should not exceed 5mm into the compressor 1. Because there are many branch pipes, the compressor 1 is a vibration source, so it is necessary to do well the shockproof work of all pipes to avoid the problem of refrigerant and refrigerant oil leakage after the pipe is broken.

[0038] The meaning of the oil concentration calculation formula is: The concentration value calculated by the oil concentration detection device = [(W5-W4) + (W3-W1)] / (W2-W1) W1 - The weight before sampling by the sampling device, unit g W2 - The weight after collecting the solution sample, unit g W3 - The empty weight of the sample in the sampling device, unit g W4 - The weight of the receiving sample device when not in use, unit g W5 - The weight of the receiving sample device after excluding the refrigerant, unit g The oil running parameter monitoring module collects the running parameters of the refrigeration oil in the compressor oil pool through the compressor suction port temperature sensor 18 installed on the suction port of the compressor 1 and the oil pool temperature sensor 19 installed at the bottom of the oil pool, and through the oil pool pressure sensor 6 installed on the sampling pipe 3. By calculating the superheat degree at the bottom position of the oil pool and the superheat degree at the suction port position, the running parameters of the oil in the oil pool are analyzed, and finally all the data are presented on the centralized monitor 20, so that the test personnel can compare and analyze whether the oil running parameters meet the design criteria in time. The compressor suction port temperature sensor 19 is to be installed at the bottom center position of the compressor oil pool, and a layer of aluminum foil with a thickness of 0.01 mm needs to be pasted on the compressor first, then the compressor suction port temperature sensor 19 is installed on the aluminum foil, and then a layer of aluminum foil is pasted again, and finally the outer part is pasted with thermal insulation material, so that the detected temperature value is not affected by the external environment temperature, and the wiring of the sensor is also fixed to prevent it from being pulled off or falling off during operation. The installation position of the compressor suction port temperature sensor 18 is close to the compressor and is installed on the side of the suction pipe. The pipe diameter of the suction pipe is thick, and the refrigerant is stratified in the pipeline, which affects the temperature value. The specific installation method is the same as that of the compressor suction port temperature sensor 19. The oil pool pressure sensor 6 is installed by welding at the position close to the main pipe, so as to monitor the oil pressure in the oil pool in real time and calculate the saturation temperature.

[0039] Through the data output by the oil running parameter monitoring module, parameter calculation can be performed, and the formula is: Compressor suction port superheat = Compressor suction port thermistor 18 - Oil pool pressure sensor 6 corresponding saturation temperature, which requires to be greater than or equal to 3K.

[0040] Compressor oil pool superheat = Oil pool bottom thermistor temperature sensor 19 - Oil pool pressure sensor 6 corresponding saturation temperature, which requires to be greater than or equal to 12K.

[0041] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A system for monitoring the state of refrigerant oil in an oil sump during compressor operation, comprising a compressor (1), wherein the compressor (1) is connected to a condenser and an evaporator via copper pipes to form a circuit; characterized in that: The system for monitoring the state of the refrigeration oil in the oil sump during compressor operation is connected to the compressor (1) via copper pipes; The system includes: an oil viscosity monitoring module, an oil concentration monitoring module, an oil condition monitoring module, and an oil operating parameter monitoring module; The oil viscosity monitoring module is connected to the sampling pipe (3) at the bottom of the oil sump of the compressor (1) through a copper pipe and is electrically connected to the oil operating parameter monitoring module to collect the oil viscosity in the compressor and transmit it directly to the oil operating parameter monitoring module so that the monitoring personnel can observe it in real time. The oil concentration monitoring module is connected to the sampling pipe (3) at the bottom of the oil tank of the compressor (1) through a copper pipe and is electrically connected to the oil operation parameter monitoring module. It collects refrigeration oil samples in the oil tank at any time and calculates the oil concentration parameters at the time of sampling. The oil status monitoring module is connected to the sight glass (2) on the compressor (1) to collect the real-time operating status of the refrigeration oil in the sight glass (2) and transmit the data to the oil operating parameter monitoring module so that the monitoring personnel can observe it in real time. The oil operation parameter monitoring module is connected to the compressor (1) and monitors the operating parameters of the refrigeration oil in the oil sump of the compressor (1) in real time during operation.

2. The system for monitoring the state of refrigerant oil in the oil sump during compressor operation according to claim 1, characterized in that: The oil viscosity monitoring module includes an oil viscosity monitoring shut-off valve (15) and a viscosity sampler (16) connected by copper pipes. The copper tube at the front end of the oil viscosity monitoring shut-off valve (15) is connected to the sampling tube (3), and a filter (4), a refrigerant oil needle valve (5), and an oil sump pressure sensor (6) are sequentially installed on the copper tube. The viscosity sampler (16) is connected to the oil operation parameter monitoring module via a data cable, and the data collected by the viscosity sampler (16) is transmitted to the oil operation parameter monitoring module for real-time observation by monitoring personnel.

3. The system for monitoring the state of refrigerant oil in the oil sump during compressor operation according to claim 1, characterized in that: The oil concentration monitoring module includes: an oil concentration module shut-off valve (9), a concentration sampling device pressure sensor (10), a sight glass (11), an oil concentration sampling tank (12), and a vacuum needle valve (13) connected in sequence by copper pipes. The copper pipe at the front end of the oil concentration module shut-off valve (9) is connected to the copper pipe between the refrigerant oil needle valve (5) and the oil sump pressure sensor (6); The copper tube at the front end of the oil concentration module shut-off valve (9) is provided with a sampling low-pressure switch (7) and an oil concentration sampling shut-off valve (8). The pressure sensor (10) of the concentration sampling device is connected to the oil operation parameter monitoring module via a data line to calculate the oil concentration parameters at the time of sampling by collecting the refrigeration oil sample in the oil pool at any time. An oil drain stop valve (14) is provided on the copper tube at the rear end of the vacuum needle valve (13).

4. The system for monitoring the state of refrigerant oil in the oil sump during compressor operation according to claim 1, characterized in that: The oil condition monitoring module includes an oil sight glass (2) installed on the compressor (1) and a video acquisition device (17) connected to the oil operating parameter monitoring module via a data cable. The sight glass (2) collects the real-time operating status of the refrigeration oil in the compressor (1) and transmits it to the video acquisition unit (17) in real time. The video acquisition unit (17) then transmits the data to the oil operating parameter monitoring module via a data cable so that the test personnel can observe it in real time.

5. The system for monitoring the state of refrigerant oil in the oil sump during compressor operation according to claim 1, characterized in that: The main body of the oil operation parameter monitoring module is a centralized monitor (20); The centralized monitor (20), together with the oil sump temperature sensor (19) installed at the bottom of the compressor (1) oil sump, the compressor suction port temperature sensor (18) at the compressor (1) suction port, and the oil sump pressure sensor (6), monitor the operating parameters of the refrigeration oil in the compressor (1) oil sump in real time during operation. The centralized monitor (20) is also connected to the sampling low-pressure switch (7), viscosity sampler (16) and concentration sampling device pressure sensor (10) via data lines so that testers can observe relevant data in real time.

6. The system for monitoring the state of refrigerant oil in the oil sump during compressor operation according to claim 1, characterized in that: The oil operation parameter monitoring module receives data transmitted from each module and performs parameter calculations to obtain the values ​​of compressor suction port superheat and compressor oil sump superheat. The formula for calculating the superheat of the compressor suction port is as follows: The superheat of the compressor suction port = the value of the compressor suction port temperature sensor (18) - the saturation temperature corresponding to the value of the oil sump pressure sensor (6); The superheat value of the compressor suction port must be ≥3K; The formula for calculating the superheat of the compressor oil sump is as follows: The superheat of the compressor oil sump = the value of the oil sump temperature sensor (19) - the saturation temperature corresponding to the value of the oil sump pressure sensor (6); The superheat value of the compressor oil sump must be ≥12K.

7. The system for monitoring the state of refrigerant oil in the oil sump during compressor operation according to claim 1, characterized in that: The oil concentration monitoring module is applied to the steady-state operating range of the compressor (1). It can accurately calculate the oil concentration value in the oil sump. The calculation formula used by the oil concentration monitoring module is as follows: Oil concentration value in the oil bath = [(W5-W4)+(W3-W1)] / (W2-W1).

8. The system for monitoring the state of refrigerant oil in the oil sump during compressor operation according to claim 1, characterized in that: The oil viscosity monitoring module is applied to the non-steady-state region of the compressor (1) operation. The output viscosity and the value of the oil pool temperature sensor (19) at the bottom of the oil pool are used to calculate the oil concentration in the oil pool through the Daniel curve.

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