A method for online testing of refrigeration oil viscosity in refrigeration system compressors

Abstract

The present invention relates to an online testing method for the viscosity of refrigeration oil in a refrigeration system compressor, comprising the following steps: a. drilling a hole in the lower shell of a compressor (6); b. injecting refrigeration oil and installing a viscosity testing sensor (7); c. connecting the compressor (6) to a system and evacuating the system; d. injecting refrigerant; e. installing two devices and accessories on the compressor (6), and connecting the viscosity testing sensor (7) to a viscosity testing host (8); f. adjusting an expansion valve (2), and energizing the compressor (6) and the oil viscosity testing host (8); g. recording the temperature and real-time kinematic viscosity (cP) value of the refrigeration oil; h. substituting the minimum kinematic viscosity value of the refrigeration oil into a screw pump oiling calculation software to calculate the oiling height; j. verifying the installation of the refrigeration oil; and k. opening the shell for inspection. The method simulates the reliability test and operating conditions of the compressor (6), tests the viscosity of the refrigeration oil online, and evaluates the reliability of the refrigeration oil. The method solves the problem that the prior art cannot effectively evaluate the reliability of the refrigeration oil and is prone to damage to parts.

Description

Technical Field

[0001] The invention relates to an online testing method for viscosity of refrigeration oil in a refrigeration system compressor, belonging to the technical field of detection. Background Art

[0002] With the rapid development of the light commercial industry, the reliability of the refrigeration system compressor is of vital importance. The compressor refrigerant oil is equivalent to the blood of the refrigeration system. If the viscosity of the compressor refrigerant oil is too high, it will not only increase the cost of the whole machine, but also reduce the efficiency of the compressor. If the viscosity of the refrigerant oil is too low, it will not form an effective oil film on the surface of the compressor pump parts, or the oil film is too thin, which will not effectively help the wear of the compressor parts and the reliability of the compressor cannot be guaranteed. Therefore, the high or low viscosity of the refrigerant oil is a big challenge to the entire compressor manufacturing industry and the technology application of the light commercial industry.

[0003] A vapor compression refrigeration system primarily consists of an evaporator, expansion valve, filter drier, condenser, exhaust valve, balancing valve, compressor, suction valve, accumulator, and capillary tubes, forming a closed circulation system. This closed circulation system is filled with a constant amount of refrigerant. The refrigerant circulates through the system, transferring heat from the food in the refrigerator's refrigerated and freezer compartments to the outside of the refrigerator, achieving the desired cooling effect. The compressor provides the power for the refrigerant's circulation, acting as the heart of the refrigeration system. The compressor's refrigerant oil, like the system's blood, lubricates and dissipates heat for the compressor components. Existing reliability testing equipment can only assess the suitability of compressor refrigerant oil through long-term simulation tests on reliability life test benches, followed by analysis of compressor components. This time-consuming process also prevents real-time monitoring of the compressor oil viscosity (cP index), making it difficult to effectively assess the refrigerant's suitability for the reliability of compressor components in vapor compression refrigeration systems. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that the existing technology cannot effectively evaluate the reliability of refrigeration oil, which easily causes damage to the compressor parts.

[0005] The technical solution adopted by the present invention to solve the technical problem is: an online testing method for the viscosity of refrigeration oil in a refrigeration system compressor, comprising the following steps:

[0006] a. Drill and open a hole at the bottom of the compressor lower shell according to the size of the viscosity test sensor, and weld the adapter;

[0007] b. Install the compressor, inject the test refrigeration oil, and install the viscosity test sensor on the adapter;

[0008] c. Connect the compressor to the refrigeration system and the vacuum pump, open the balancing valve, and evacuate the system to meet the process requirements;

[0009] d. Connect the refrigerant cylinder and inject the refrigerant into the refrigeration system. When the balance pressure reaches the required pressure, close the balance valve and the refrigerant filling is completed;

[0010] e. Install two devices and accessories on the compressor, and connect the viscosity test sensor to the refrigeration oil viscosity test host through the connecting cable;

[0011] f. After the compressor is powered on, adjust the expansion valve so that the system suction and exhaust pressures reach the set working conditions. When the compressor is powered on and the oil viscosity test host is powered on, monitor the refrigeration oil viscosity online;

[0012] g. When the compressor runs stably, record the refrigeration oil temperature and real-time kinematic viscosity cP value;

[0013] h. After the test, the minimum kinematic viscosity of the refrigeration oil recorded when the compressor is running stably is substituted into the screw pump oiling calculation software to calculate the compressor oiling height to confirm whether the viscosity of the compressor refrigeration oil meets the requirements;

[0014] j. After the real-time kinematic viscosity cP of the compressor refrigeration oil meets the requirements, the compressor reliability test is carried out using the refrigeration oil with this viscosity;

[0015] k. After the compressor reliability test is completed, open the shell for inspection to verify whether the viscosity of the compressor refrigeration oil meets the compressor reliability test requirements.

[0016] Wherein, in step b of the above method, the moisture in the compressor needs to be dried so that the moisture content in the compressor is ≤50mg.

[0017] Wherein, the refrigeration oil viscosity test host in step e of the above method has a display screen.

[0018] Furthermore, in step g of the above method, the test data is recorded every 30 minutes until the compressor is fully operational and stable, generally for 120 minutes.

[0019] The shell opening inspection in step k of the above method includes abnormal damage or wear of the pump body, motor, and valve group components.

[0020] Wherein, the system in step b of the above method is a single-cell life test bench system.

[0021] Wherein, in step c of the above method, the system is evacuated to below 20 Pa.

[0022] Wherein, the equilibrium pressure in step d of the above method reaches 0.2-1.1 MPa.

[0023] In the above method, the expansion valve is adjusted in step d so that the suction pressure of the system is 0 to 0.4 MPa and the exhaust pressure is 0.6 to 3 MPa.

[0024] In the above method, in step g, after the compressor has been running for 1 hour, the system suction and exhaust pressure and the compressor shell temperature remain substantially unchanged.

[0025] The beneficial effects of the present invention are as follows: This method involves drilling and opening a hole in the bottom of the existing compressor lower shell, welding an adapter, installing the compressor, injecting refrigerant oil, and installing a viscosity test sensor, thereby obtaining an online test device for the viscosity of refrigerant oil in a refrigeration system compressor. This device can simulate the reliability test and operating conditions of the compressor, conduct an online refrigerant oil viscosity test on the compressor, and effectively evaluate whether the refrigerant oil is suitable for the reliability of compressor components in a vapor compression refrigeration system. At the same time, this method is of great reference value for compressor manufacturers to monitor the refrigerant oil viscosity cP index online, and can effectively guide compressor manufacturers to rationally use refrigerant oil with appropriate viscosity, shorten the entire machine test cycle, reduce trial and error costs, improve development efficiency, and largely avoid compressor failures such as increased costs, wear of compressor parts, and jamming caused by the use of inappropriate refrigerant oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the system connection structure of the present invention.

[0027] The markings in the figure are: 1 is the evaporator, 2 is the expansion valve, 3 is the drying filter, 4 is the condenser, 5 is the exhaust valve, 6 is the compressor, 7 is the viscosity test sensor, 8 is the viscosity test host, 9 is the balancing valve, 10 is the suction valve, and 11 is the liquid receiver. DETAILED DESCRIPTION

[0028] The present invention will be further described below with reference to the accompanying drawings.

[0029] like Figure 1 As shown, the present invention provides an online testing method for the viscosity of refrigeration oil in a refrigeration system compressor, comprising the following steps:

[0030] a. Drill and open a hole at the bottom of the lower shell of the compressor 6 according to the size of the viscosity test sensor 7, and weld the adapter;

[0031] b. Install the compressor 6, inject the test refrigeration oil, and install the viscosity test sensor 7 on the adapter;

[0032] c. Connect the compressor 6 to the refrigeration system and the vacuum pump, open the balancing valve 9, and evacuate the system to meet the process requirements;

[0033] d. Connect the refrigerant cylinder and inject the refrigerant into the refrigeration system. When the balance pressure reaches the required pressure, close the balance valve 9 and the refrigerant filling is completed;

[0034] e. Install two devices and accessories on the compressor 6, and connect the viscosity test sensor 7 to the refrigeration oil viscosity test host 8 through the connecting cable;

[0035] f. After the compressor is powered on, adjust the expansion valve 2 so that the system suction and exhaust pressures reach the set working conditions. The compressor 6 is powered on and the oil viscosity test host 8 is powered on at the same time to monitor the refrigeration oil viscosity online.

[0036] g. When the compressor 6 is running stably, record the refrigeration oil temperature and real-time kinematic viscosity cP value;

[0037] h. After the test, the minimum kinematic viscosity of the refrigeration oil recorded when the compressor 6 is running stably is substituted into the screw pump oiling calculation software to calculate the oiling height of the compressor 6 to confirm whether the viscosity of the refrigeration oil in the compressor 6 meets the requirements;

[0038] j. After the real-time kinematic viscosity cP of the refrigeration oil of compressor 6 meets the requirements, the reliability test of compressor 6 is carried out using the refrigeration oil of this viscosity;

[0039] k. After the reliability test and verification of compressor 6 is completed, the compressor 6 is opened for inspection to verify whether the viscosity of the refrigerant oil in compressor 6 meets the requirements for the compressor 6 reliability test. Those skilled in the art will appreciate that this method involves drilling and opening a hole in the bottom of the lower housing of compressor 6, welding an adapter, installing compressor 6, injecting refrigerant oil, and installing a viscosity test sensor 7 at the adapter. The refrigerant oil viscosity cP index is recorded via a viscosity test host 8 electrically connected to the sensor. This setup results in an online refrigerant oil viscosity test device for refrigeration system compressor 6. This device can simulate the reliability test and operating conditions of compressor 6, conduct online refrigerant oil viscosity testing on compressor 6, and effectively assess the refrigerant oil's suitability for the reliability of components in a vapor compression refrigeration system. Furthermore, in step c, compressor 6 is primarily connected to the existing refrigeration system's evaporator 1, expansion valve 2, filter drier 3, condenser 4, exhaust valve 5, balancing valve 9, intake valve 10, and liquid reservoir 11 to form a closed-loop refrigeration system. The two components and accessories in step h are prior art, primarily including a protector, starter, capacitor, junction box, rubber gasket, and other accessories. The screw pump oiling calculation software in step h is also prior art. The reliability test of the compressor 6 in step j is verified to be prior art. Preferred refrigerants are R290, R404A, R134a and R600a.

[0040] Preferably, in step b of the above method, the moisture in the compressor 6 needs to be dried so that the moisture content in the compressor 6 is ≤50 mg. It will be understood by those skilled in the art that in order to ensure that the compressor 6 works well, it is preferred to dry the moisture in the compressor 6 so that the moisture content in the compressor 6 is ≤50 mg.

[0041] Preferably, the refrigeration oil viscosity test host 8 in step e of the above method has a display screen. Those skilled in the art will appreciate that, in order to facilitate data recording, the present method preferably has the refrigeration oil viscosity test host 8 with a display screen.

[0042] Preferably, test data is recorded every 30 minutes in step g of the above method until compressor 6 is fully operational and stable, typically for 120 minutes. Those skilled in the art will appreciate that compressor 6 is generally considered to be in a stable operating state after running for 1 hour, with system suction and exhaust pressures and compressor 6 shell temperature remaining essentially unchanged. This is the purpose of this test requiring continuous data recording for 120 minutes.

[0043] Preferably, the unpacking inspection in step k of the above method includes checking for abnormal damage or wear of the pump body, motor, and valve assembly components. Those skilled in the art will appreciate that the unpacking inspection is primarily a review of the reliability of the compressor 6 and thus primarily involves the operating conditions of the components of the compressor 6. Therefore, the unpacking inspection preferably includes checking for abnormal damage or wear of the pump body, motor, and valve assembly components.

[0044] Preferably, the system in step b of the above method is a single-unit life test bench system. Those skilled in the art will appreciate that, to ensure the method is carried out properly, the system in step b is preferably a single-unit life test bench system. Single-unit life test bench systems are currently used primarily to test the reliability of compressors 6.

[0045] Preferably, in step c of the above method, the system is evacuated to below 20 Pa. Those skilled in the art will appreciate that, in order to ensure the injection of refrigerant, it is preferred to evacuate the system to below 20 Pa, i.e., ≤20 Pa, in step a.

[0046] Preferably, the equilibrium pressure in step d of the above method reaches 0.2-1.1 MPa. It will be understood by those skilled in the art that, in this method, the equilibrium pressure in step d is preferably 0.2-1.1 MPa depending on the refrigerant.

[0047] Preferably, in step d of the above method, the expansion valve 2 is adjusted so that the system suction pressure is 0 to 0.4 MPa and the discharge pressure is 0.6 to 3 MPa. It will be appreciated by those skilled in the art that, depending on the type of refrigerant and the operating conditions of the compressor 6, the present method preferably sets the system suction pressure to 0 to 0.4 MPa and the discharge pressure to 0.6 to 3 MPa to achieve the set system suction and discharge pressures.

[0048] Preferably, in step g of the above method, after the compressor 6 has been running for 1 hour, the system suction and exhaust pressure and the shell temperature of the compressor 6 remain substantially unchanged. It will be understood by those skilled in the art that, after the compressor 6 is powered on, the suction and exhaust high and low pressure differences are generally established within 2 minutes. At this time, the system evaporation temperature and condensation temperature have not yet fully reached the set working conditions required for refrigeration, and the compressor 6 needs to continue to operate. As the compressor 6 continues to operate, the system working conditions approach the set working conditions, and the shell temperature of the compressor 6 gradually increases. Therefore, in step g, after the compressor 6 runs stably, it means that the compressor 6 can be considered to be in a stable operating state after running for 1 hour, and the system suction and exhaust pressure and the shell temperature of the compressor 6 remain substantially unchanged.

[0049] Example 1

[0050] Drill and open a φ23mm hole at the bottom of the lower shell of compressor 6, and weld an adapter; install compressor 6, inject test refrigeration oil RL22H, and install viscosity test sensor 7 on the adapter. The parameter model of viscosity test sensor 7 is Models SPL501. The probe has a 1 / 2" NPT threaded connector and is directly installed on the container wall; connect compressor 6 to the refrigeration system and connect it to the vacuum pump, open the balancing valve 9, and evacuate the system to a vacuum degree of 10Pa; connect the R290 refrigerant cylinder, and charge the refrigerant into the refrigeration system. When the balance pressure reaches the required pressure, that is, the pressure size is 0.85MPa, close the valve. The balancing valve 9 completes the refrigerant charging process; the compressor 6 is equipped with two devices and accessories, and the viscosity test sensor 7 is connected to the refrigeration oil viscosity test host 8 via a connecting cable; the expansion valve 2 is adjusted so that the system suction and exhaust pressures meet the relevant parameters of the working conditions, the suction pressure is 0.215MPa, and the exhaust pressure is 1.88MPa. The compressor 6 is powered on and the oil viscosity test host 8 is powered on to monitor the refrigeration oil viscosity online; when the compressor 6 runs stably, generally, the compressor 6 can be considered to be in a stable operating state after running for 1 hour, and the system suction and exhaust pressure and the compressor 6 shell temperature remain basically unchanged. The refrigeration oil temperature and real-time kinematic viscosity cP value are recorded, as shown in the table below;

[0051]

[0052] After the test, the minimum kinematic viscosity of the refrigeration oil recorded when the compressor 6 is running stably is substituted into the screw pump oiling calculation software to calculate the oiling height of the compressor 6.

[0053]

[0054] Confirm that the viscosity of the compressor 6 refrigeration oil meets the specific requirements, the oiling height is greater than the distance from the oil level of the compressor 6 to the short axis of the crankshaft ≥44mm; the real-time kinematic viscosity cP of the compressor 6 refrigeration oil meets the requirements, and then use the refrigeration oil with this viscosity to install the compressor 6 reliability test verification; after the reliability test verification of the compressor 6 is completed, the shell is opened for inspection, the surface wear standard is ≥ level 3, the appearance quality evaluation standard is ≤ level 3, and the viscosity of the compressor 6 refrigeration oil meets the compressor 6 reliability test requirements.

[0055] Example 2

[0056] Drill and open a φ23mm hole at the bottom of the lower shell of compressor 6, and weld an adapter. Install compressor 6, inject test refrigeration oil RL32H, and install viscosity test sensor 7 on the adapter. The parameter model of viscosity test sensor 7 is Models SPL501. The probe has a 1 / 2" NPT threaded connector and is directly installed on the container wall. Connect compressor 6 to the refrigeration system and connect it to the vacuum pump. Open the balancing valve 9 and evacuate the system to a vacuum degree of 10Pa. Connect the R404A refrigerant cylinder and charge the refrigerant into the refrigeration system. When the balance pressure reaches the required pressure, that is, the pressure size is 1.1MPa, close the valve. The balancing valve 9 completes the refrigerant charging process; the compressor 6 is installed with two devices and accessories, and the viscosity test sensor 7 is connected to the refrigeration oil viscosity test host 8 via a connecting cable; the expansion valve 2 is adjusted so that the system suction and exhaust pressures meet the relevant parameters of the working conditions, the suction pressure is 0.27MPa, and the exhaust pressure is 2.55MPa. The compressor 6 is powered on and the oil viscosity test host 8 is powered on to monitor the refrigeration oil viscosity online; when the compressor 6 runs stably, generally the compressor 6 can be considered to be in a stable operating state after running for 1 hour, and the system suction and exhaust pressure and the compressor 6 shell temperature remain basically unchanged. The refrigeration oil temperature and real-time kinematic viscosity cP value are recorded, as shown in the table below;

[0057]

[0058] After the test, the minimum kinematic viscosity of the refrigeration oil recorded when the compressor 6 is running stably is substituted into the screw pump oiling calculation software to calculate the oiling height of the compressor 6.

[0059]

[0060] Confirm that the viscosity of the compressor 6 refrigeration oil meets the specific requirements, the oiling height is greater than the distance from the oil level of the compressor 6 to the short axis of the crankshaft ≥44mm; the real-time kinematic viscosity cP of the compressor 6 refrigeration oil meets the requirements, and then use the refrigeration oil with this viscosity to install the compressor 6 reliability test verification; after the reliability test verification of the compressor 6 is completed, the shell is opened for inspection, the surface wear standard is ≥ level 3, the appearance quality evaluation standard is ≤ level 3, and the viscosity of the compressor 6 refrigeration oil meets the compressor 6 reliability test requirements.

[0061] Example 3

[0062] Drill and open a φ23mm hole at the bottom of the lower shell of compressor 6, and weld an adapter; install compressor 6, inject test refrigeration oil RL10H, and install viscosity test sensor 7 on the adapter. The parameter model of viscosity test sensor 7 is Models SPL501. The probe has a 1 / 2" NPT threaded connector and is directly installed on the container wall; connect compressor 6 to the refrigeration system and connect it to the vacuum pump, open the balancing valve 9, and evacuate the system to a vacuum degree of 10Pa; connect the R134a refrigerant cylinder, and charge the refrigerant into the refrigeration system. When the balance pressure reaches the required pressure, that is, the pressure size is 0.5MPa, close the valve. The balancing valve 9 completes the refrigerant charging process; the compressor 6 is installed with two devices and accessories, and the viscosity test sensor 7 is connected to the refrigeration oil viscosity test host 8 via a connecting cable; the expansion valve 2 is adjusted so that the system suction and exhaust pressures meet the relevant parameters of the working conditions, the suction pressure is 0.115MPa, and the exhaust pressure is 1.47MPa. The compressor 6 is powered on and the oil viscosity test host 8 is powered on to monitor the refrigeration oil viscosity online; when the compressor 6 runs stably, generally the compressor 6 can be considered to be in a stable operating state after running for 1 hour, and the system suction and exhaust pressure and the compressor 6 shell temperature remain basically unchanged. The refrigeration oil temperature and real-time kinematic viscosity cP value are recorded, as shown in the table below;

[0063]

[0064] After the test, the minimum kinematic viscosity of the refrigeration oil recorded when the compressor 6 is running stably is substituted into the screw pump oiling calculation software to calculate the oiling height of the compressor 6.

[0065]

[0066] Confirm that the viscosity of the compressor 6 refrigeration oil meets the specific requirements, the oiling height is greater than the distance from the oil level of the compressor 6 to the short axis of the crankshaft ≥44mm; the real-time kinematic viscosity cP of the compressor 6 refrigeration oil meets the requirements, and then use the refrigeration oil with this viscosity to install the compressor 6 reliability test verification; after the reliability test verification of the compressor 6 is completed, the shell is opened for inspection, the surface wear standard is ≥ level 3, the appearance quality evaluation standard is ≤ level 3, and the viscosity of the compressor 6 refrigeration oil meets the compressor 6 reliability test requirements.

[0067] Example 4

[0068] Drill a 23mm hole at the bottom of the lower shell of compressor 6 and weld the adapter. Install compressor 6, inject 10g of test refrigeration oil, and install viscosity test sensor 7 on the adapter. Parameter model of viscosity test sensor 7 The SPL501 probe has a 1 / 2" NPT threaded connector and is directly installed on the container wall. Connect the compressor 6 to the refrigeration system and the vacuum pump. Open the balancing valve 9 and evacuate the system to a vacuum degree of 10Pa. Connect the R600a refrigerant cylinder and inject the refrigerant into the refrigeration system. When the balanced pressure reaches the required pressure, that is, the pressure of 0.3MPa, close the balancing valve 9 and the refrigerant charging is complete. Install the two devices and accessories on the compressor 6. At the same time, connect the viscosity test sensor 7 to the refrigeration oil viscosity test host 8 via the connecting cable. Adjust the expansion valve 2 so that the system suction and exhaust pressures meet the relevant parameters of the operating conditions: suction pressure of 0.062MPa and exhaust pressure of 0.76MPa. Power on the compressor 6 and the oil viscosity test host 8 to monitor the refrigeration oil viscosity online. When the compressor 6 is running stably, generally after running for 1 hour, it can be considered to be in a stable operating state. The system suction and exhaust pressures and the compressor 6 shell temperature remain basically unchanged. Record the refrigeration oil temperature and real-time kinematic viscosity cP value. See the table below for details.

[0069]

[0070]

[0071] After the test, the minimum kinematic viscosity of the refrigeration oil recorded when the compressor 6 is running stably is substituted into the screw pump oiling calculation software to calculate the oiling height of the compressor 6.

[0072]

[0073] Confirm that the viscosity of the compressor 6 refrigeration oil meets the specific requirements, the oiling height is greater than the distance from the oil level of the compressor 6 to the short axis of the crankshaft ≥38mm; the real-time kinematic viscosity cP of the compressor 6 refrigeration oil meets the requirements, and then use the refrigeration oil with this viscosity to install the compressor 6 reliability test verification; after the reliability test verification of the compressor 6 is completed, the shell is opened for inspection, the surface wear standard is ≥level 3, the appearance quality evaluation standard is ≤level 3, and the viscosity of the compressor 6 refrigeration oil meets the compressor 6 reliability test requirements.

Claims

1. A method for online testing of the viscosity of refrigeration oil in a refrigeration system compressor, characterized in that The steps include: a. Drill and open a hole at the bottom of the compressor (6) lower shell according to the size of the viscosity test sensor (7) and weld the adapter; b. Install the compressor (6), inject test refrigeration oil, and install the viscosity test sensor (7) on the adapter; c. Connect the compressor (6) to the refrigeration system and to the vacuum pump, open the balancing valve (9), and evacuate the system to meet the process requirements; d. Connect the refrigerant cylinder and inject the refrigerant into the refrigeration system. When the balance pressure reaches the required pressure, close the balance valve (9) and the refrigerant filling is completed; e. Install two devices and accessories on the compressor (6), and connect the viscosity test sensor (7) to the refrigeration oil viscosity test host (8) via a connecting cable; f. After the compressor is powered on, the expansion valve (2) is adjusted so that the system suction and exhaust pressures reach the set working conditions. The compressor (6) is powered on and the oil viscosity test host (8) is powered on to monitor the refrigeration oil viscosity online; g. When the compressor (6) runs stably, record the refrigeration oil temperature and real-time kinematic viscosity cP value; h. After the test, the minimum kinematic viscosity of the refrigeration oil recorded when the compressor (6) is running stably is substituted into the screw pump oiling calculation software to calculate the oiling height of the compressor (6) to confirm whether the viscosity of the refrigeration oil of the compressor (6) meets the requirements; j. After the real-time kinematic viscosity cP of the refrigeration oil of the compressor (6) meets the requirements, the reliability test of the compressor (6) is carried out using the refrigeration oil of this viscosity; k. After the reliability test verification of the compressor (6) is completed, the shell is opened for inspection to verify whether the viscosity of the refrigeration oil of the compressor (6) meets the requirements of the reliability test of the compressor (6).

2. The method for online testing viscosity of refrigeration oil in a refrigeration system compressor according to claim 1, characterized in that: In the step b, the moisture in the compressor (6) needs to be dried so that the moisture content in the compressor (6) is ≤50 mg.

3. The online testing method for viscosity of refrigeration oil in a refrigeration system compressor according to claim 1, characterized in that: In the step e, the refrigeration oil viscosity test host (8) is provided with a display screen.

4. The method for online testing viscosity of refrigeration oil in a refrigeration system compressor according to claim 3, characterized in that: In step g, the test data is recorded every 30 minutes until the compressor (6) is fully operational and stable, generally for 120 minutes.

5. The method for online testing viscosity of refrigeration oil in a refrigeration system compressor according to claim 1, characterized in that: The shell opening inspection in step k includes abnormal damage or wear of the pump body, motor, and valve group components.

6. The method for online testing viscosity of refrigeration oil in a refrigeration system compressor according to claim 1, characterized in that: The system in step b is a single-unit life test bench system.

7. The method for online testing viscosity of refrigeration oil in a refrigeration system compressor according to claim 1, characterized in that: In the step c, the system is evacuated to below 20 Pa.

8. The method for online testing viscosity of refrigeration oil in a refrigeration system compressor according to claim 1, characterized in that: The equilibrium pressure in step d reaches 0.2-1.1 MPa.

9. The method for online testing viscosity of refrigeration oil in a refrigeration system compressor according to claim 1, characterized in that: The expansion valve (2) is adjusted in step d so that the suction pressure of the system is 0 to 0.4 MPa and the exhaust pressure is 0.6 to 3 MPa.

10. The method for online testing viscosity of refrigeration oil in a refrigeration system compressor according to claim 1, characterized in that: In step g, after the compressor (6) has been running for 1 hour, the system suction and exhaust pressures and the compressor shell temperature remain substantially unchanged.

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