Compressor performance testing system and testing method thereof

Abstract

The present invention relates to the technical field of air conditioning testing, and discloses a compressor performance testing system and a testing method thereof, comprising: a high-efficiency oil separator, arranged in the exhaust section of the compressor to be tested, for separating the refrigerant and engine oil mixed in the exhaust section; an oil storage tank, connected to the high-efficiency oil separator, for collecting the engine oil separated by the high-efficiency oil separator, the internal oil storage space of the oil storage tank being a cylindrical space of equal cross-section; an oil return pipe, connecting the oil storage tank and the suction section of the compressor; an oil return valve, arranged on the oil return pipe; and a mass flow meter, arranged on the oil return pipe, and located between the oil return valve and the oil storage tank. By arranging the oil storage tank between the oil return pipe and the high-efficiency oil separator, the return oil temperature can be effectively reduced, and the suction temperature fluctuation caused by the refluxed engine oil with excessively high temperature mixing with the refrigerant in the suction section of the compressor can be avoided. The control stability of the test system when subjected to flow disturbance can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning testing, and in particular to a compressor performance testing system and a testing method thereof. Background Art

[0002] In the current development of air-conditioning compressors and the matching design of air-conditioning systems, the circulation rate of compressor oil in the system loop is an important design indicator. During the operation of an air-conditioning system, if the compressor oil circulation rate is too large, the refrigerant ratio will decrease accordingly, which will lead to poor heat exchange performance; if the compressor oil circulation rate is too small, the compressor cavity will not be able to get enough lubricating oil replenishment, resulting in reduced lubrication performance and wear of the moving mechanism, which will affect product reliability. Therefore, when conducting compressor performance tests, in order to accurately analyze the relationship between the oil circulation rate (or oil content, which refers to the ratio of oil content to refrigerant flow at the time) and the cooling capacity and COP (heating performance coefficient of air conditioners), the compressor performance test equipment must have the ability to measure the oil content (or oil circulation volume, which refers to the flow rate of compressor oil circulating in the pipeline with the refrigerant when the refrigeration system is running) as accurately as possible, and at the same time, it should be able to stably control the oil circulation volume within a certain range.

[0003] According to the investigation, the existing compressor performance test scheme rarely considers the fine control of oil circulation rate. Generally, a flow valve is set on the oil return pipeline connecting the exhaust section and the intake section of the compressor, and the opening of the flow valve is controlled according to the preset oil circulation rate target. This test scheme still has various shortcomings such as inaccurate results and difficult to control working conditions. Summary of the invention

[0004] The present invention provides a compressor performance testing system and a testing method thereof, so as to solve the technical problems of inaccurate test results and difficult control of working conditions in existing compressor performance testing schemes.

[0005] In a first aspect, the present invention provides a compressor performance testing system, comprising:

[0006] A high-efficiency oil separator, which is installed in the exhaust section of the compressor to be tested, is used to separate the refrigerant and oil mixed in the exhaust section;

[0007] An oil storage tank, connected to the high-efficiency oil separator, for collecting the engine oil separated by the high-efficiency oil separator, wherein the internal oil storage space of the oil storage tank is a cylindrical space with a uniform cross-section;

[0008] An oil return pipe, connecting the oil storage tank and the suction section of the compressor;

[0009] an oil return valve, disposed on the oil return pipe; and

[0010] The mass flow meter is arranged on the oil return pipe and is located between the oil return valve and the oil storage tank.

[0011] In some embodiments, a liquid level probe is provided in the oil storage tank for obtaining the actual measured oil level of the oil storage tank.

[0012] By setting a liquid level probe in the oil storage tank, the oil level change in the oil storage tank can be accurately detected in real time. When the oil level is balanced, it can reflect that the oil circulation volume in the test system or air conditioning system has been basically stable.

[0013] In some embodiments, the compressor performance testing system also includes a PID controller, which is electrically connected to the liquid level probe and the oil return valve, and adjusts the opening of the oil return valve according to a preset target oil level height and the actual oil level height measured by the liquid level probe.

[0014] The opening of the oil return valve is automatically adjusted using a PID controller. The control target parameter is the oil level in the oil storage tank. The oil flow is indirectly controlled, making the oil circulation volume easier to be stably controlled.

[0015] In some embodiments, the oil storage tank is connected to a pressure source.

[0016] The pressure source is set at the top of the oil storage tank. The pressure in the pressure source refers to the air pressure. The pressure source can maintain the return oil pressure relative to the suction section of the compressor and ensure that the return oil pipe is filled with oil to avoid abnormal fluctuations in the mass flow meter measurement value.

[0017] In some embodiments, the oil storage tank is provided with a refueling port and an oil drain port. The oil volume in the oil storage tank can be adjusted through the refueling port and the oil drain port, so as to match the test of compressors with different displacements and facilitate maintenance. The oil storage tank can also be pre-filled with an appropriate amount of oil.

[0018] Furthermore, the oil storage tank is provided with an observation window, which is preferably arranged at 3 / 4 of the height of the oil storage tank, so as to facilitate observation of the oil quantity or oil level in the oil storage tank.

[0019] In some embodiments, the oil storage tank may be made of a transparent material to facilitate direct observation of the oil level and amount inside the oil storage tank.

[0020] In some embodiments, the oil storage tank is connected to a cooling system.

[0021] The cooling system is preferably an existing cooling system in the air conditioning system where the compressor is located. The oil storage tank is connected to the cooling system to avoid fluctuations in the compressor suction temperature due to the continuous increase in the return oil temperature during the test operation.

[0022] In some embodiments, the oil storage tank is installed at a higher height than the mass flow meter.

[0023] Place the mass flow meter at a height lower than the oil tank to ensure that the measuring section of the return oil pipe (a section of the return oil pipe between the mass flow meter and the oil tank) is filled with oil to avoid abnormal fluctuations in the measured value of the oil flow of the mass flow meter.

[0024] In a second aspect, the present invention further provides a compressor performance test method, which uses the above compressor performance test system to perform a performance test on a compressor, including an installation step and an oil circulation volume measurement step;

[0025] The installation steps include: installing a high-efficiency oil separator in the exhaust section of the compressor to be tested to separate the refrigerant and oil mixed in the exhaust section; connecting an oil storage tank with the high-efficiency oil separator to collect the oil separated by the high-efficiency oil separator in the oil storage tank; connecting the oil storage tank and the suction section of the compressor by an oil return pipe; installing an oil return valve on the oil return pipe; installing a mass flow meter on the oil return pipe between the oil return valve and the oil storage tank;

[0026] The oil circulation volume measurement step includes: obtaining an initial oil level height H in the oil storage tank, setting the initial oil level height H as a target oil level height H0, and recording it, starting the test system and the compressor, adjusting the opening of the oil return valve, and obtaining the actual measured oil level height H' in the oil storage tank in real time, until the actual measured oil level height H' is stabilized within the floating range allowed by the target oil level height H0. At this time, the actual measured flow value of the mass flow meter is the oil circulation volume required for the test.

[0027] In some embodiments, the following oil circulation amount control step is also included:

[0028] According to the test conditions, preset the target refrigerant flow MF and target oil flow mF;

[0029] Obtain the initial oil level height H in the oil storage tank, preset the target oil level height H0=H-Ncm in the oil storage tank, where N is greater than or equal to 0; close the oil return valve;

[0030] Starting the compressor, and adjusting the parameters of the compressor until the measured refrigerant flow rate MF' of the refrigerant separated by the high-efficiency oil separator is stabilized within the floating range allowed by the target refrigerant flow rate MF;

[0031] The oil return valve is opened and the opening of the oil return valve is adjusted to obtain the actual oil level height H' in the oil storage tank in real time. The test system and the compressor continue to operate until the actual oil level height H' is stabilized within the floating range allowed by the target oil level height H0, and the actual oil flow mF' obtained by the mass flow meter at this time is recorded;

[0032] The target oil level height H0 is proportionally corrected to obtain a corrected target oil level height H1, wherein the target oil level height H0 and the corrected target oil level height H1 satisfy the following relationship: (H0-H1) / (H-H0)=(mF-mF') / mF';

[0033] Based on the corrected target oil level H1, continue to adjust the oil return valve opening until the measured oil level H' is stabilized within the allowable floating range of the corrected target oil level H1 and the measured oil flow mF' is stabilized within the allowable floating range of the target oil flow mF.

[0034] The beneficial effects brought by the technical solution provided by the present invention include: by setting a high-efficiency oil separator for separating the refrigerant and oil mixed in the exhaust section in the exhaust section of the compressor to be tested, the oil circulation rate of the refrigerant pipeline in the air-conditioning system loop is reduced, the measurement value of the refrigerant flowmeter is more accurate, and the heat exchange calculation basically does not need to correct the oil circulation amount. By setting an oil storage tank between the return oil pipe and the high-efficiency oil separator, the oil separated by the high-efficiency oil separator first enters the oil storage tank and then enters the return oil pipe, which can effectively reduce the return oil temperature and avoid the return oil with too high temperature mixing with the refrigerant in the suction section of the compressor. The oil storage property of the oil storage tank can be used to control the amount of oil refluxed to the compressor through the return oil pipe, so that the total amount of oil in the compressor can be increased or decreased in real time according to demand. The cooperation of the oil storage tank, the mass flowmeter and the return oil valve can improve the control stability of the test system when it is disturbed by the flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 It is a schematic diagram of the structural principle of the compressor performance testing system of the present invention.

[0037] In the figure: 10 - compressor; 20 - high-efficiency oil separator; 30 - oil storage tank; 40 - oil return pipe; 50 - oil return valve; 60 - mass flow meter; 70 - PID controller. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] In the current development of air-conditioning compressors and the matching design of air-conditioning systems, the circulation rate of compressor oil in the system loop is an important design indicator.

[0040] During the operation of an air-conditioning system, if the compressor oil circulation rate is too high, the refrigerant ratio will decrease accordingly, resulting in poor heat exchange performance; if the compressor oil circulation rate is too low, the compressor cavity cannot get enough lubricating oil replenishment, resulting in reduced lubrication performance and wear of the moving mechanism, which in turn affects product reliability.

[0041] Therefore, when conducting compressor performance tests, in order to accurately analyze the relationship between the oil circulation rate (or oil content, which refers to the ratio of the oil content to the refrigerant flow rate at that time) and the cooling capacity and COP (heating performance coefficient of the air conditioner), the compressor performance test equipment must have the ability to measure the oil content (or oil circulation volume, which refers to the flow rate of the compressor oil circulating in the pipeline with the refrigerant when the refrigeration system is running) as accurately as possible, and should be able to stably control the oil circulation volume within a certain range.

[0042] According to investigation, the existing compressor performance test schemes rarely consider the fine control of the oil circulation rate. Generally, a flow valve is set on the oil return pipeline connecting the exhaust section and the intake section of the compressor, and the opening of the flow valve is controlled according to the pre-set oil circulation rate target.

[0043] This test solution still has various shortcomings, such as inaccurate results and difficult to control working conditions. For example, in actual applications, it was found that this solution still has several defects. First, the return oil temperature is high, which causes suction temperature fluctuations when it mixes with the refrigerant in the suction section of the compressor; second, the total amount of compressor oil in the system cannot be increased or decreased in real time according to demand; third, the control stability is poor when the system is disturbed.

[0044] In order to solve the above problems, Figure 1 As shown, this embodiment proposes a compressor performance test system, including: a high-efficiency oil separator 20, an oil storage tank 30, an oil return pipe 40, an oil return valve 50, and a mass flow meter 60.

[0045] The high-efficiency oil separator 20 is arranged at the exhaust section of the compressor 10 to be tested, and is used to separate the refrigerant and the oil mixed in the exhaust section. The separated refrigerant continues to enter the refrigerant circulation pipe of the air-conditioning system. In some embodiments, a refrigerant flow meter is arranged on the refrigerant circulation pipe to measure the refrigerant flow. In this embodiment, the separation efficiency of the high-efficiency oil separator 20 is 99.5%.

[0046] The oil storage tank 30 is communicated with the high-efficiency oil separator 20 and is used to collect the engine oil separated by the high-efficiency oil separator 20. The internal oil storage space of the oil storage tank 30 is a cylindrical space with a uniform cross-section.

[0047] The oil return pipe 40 communicates with the oil storage tank 30 and the suction section of the compressor 10 .

[0048] The oil return valve 50 is disposed on the oil return pipe 40 .

[0049] The mass flow meter 60 is disposed on the oil return pipe 40 and is located between the oil return valve 50 and the oil storage tank 30 .

[0050] The oil storage tank 30 is provided with a liquid level probe for obtaining the actual oil level of the oil storage tank 30. By providing the liquid level probe in the oil storage tank 30, the oil level change in the oil storage tank 30 can be accurately detected in real time. When the oil level is balanced, it can be reflected that the oil circulation amount in the test system or the air conditioning system has been basically stable.

[0051] The compressor 10 performance test system also includes a PID controller 70, which is electrically connected to the liquid level probe and the oil return valve 50, and adjusts the opening of the oil return valve 50 according to a preset target oil level combined with the actual oil level of the liquid level probe.

[0052] The opening of the oil return valve 50 is automatically adjusted using a PID controller 70, and the control target parameter is the oil level height of the oil storage tank 30, which indirectly controls the oil flow rate, making it easier to stably control the oil circulation volume.

[0053] The oil storage tank 30 is connected to a pressure source.

[0054] The pressure source is arranged at the top of the oil storage tank 30, and the pressure in the pressure source refers to the air pressure. The pressure source can maintain the return oil pressure relative to the suction section of the compressor 10, and ensure that the return oil pipe 40 is filled with oil, so as to avoid abnormal fluctuations in the measurement value of the mass flow meter 60. The pressure source adopts an existing conventional boosting device. This embodiment does not limit the specific structure of the pressure source.

[0055] The oil storage tank 30 is provided with a refueling port and an oil drain port.

[0056] The oil volume in the oil storage tank 30 can be adjusted by the oil filling port and the oil drain port, so as to match the test of the compressor 10 with different displacements and facilitate maintenance. The oil storage tank 30 can also be pre-filled with an appropriate amount of oil. The oil filling port is pre-set at the top of the oil storage tank 30, and the oil drain port is pre-set at the bottom of the oil storage tank 30.

[0057] An observation window is provided on the oil storage tank 30. The observation window is preferably provided at 3 / 4 of the height of the oil storage tank 30, so as to facilitate observation of the oil quantity or oil level in the oil storage tank 30.

[0058] The oil storage tank 30 may be made of a transparent material, so that the oil level and amount inside the oil storage tank 30 can be directly observed.

[0059] The oil storage tank 30 is connected to a cooling system. The cooling system is preferably an existing cooling system in the air conditioning system where the compressor 10 is located. The oil storage tank 30 is connected to the cooling system to avoid fluctuations in the suction temperature of the compressor 10 due to the continuous increase in the return oil temperature during the test operation. The cooling system includes a cooling pipe, which is wrapped around the outside of the oil storage tank 30.

[0060] The installation height of the oil storage tank 30 is higher than the installation height of the mass flow meter 60. The mass flow meter 60 is arranged at a height lower than the oil storage tank 30 to ensure that the measuring section of the oil return pipe 40 (a section of the oil return pipe 40 between the mass flow meter 60 and the oil storage tank 30) is filled with oil, thereby avoiding abnormal fluctuations in the measured value of the oil flow of the mass flow meter 60.

[0061] By setting a high-efficiency oil separator 20 for separating the refrigerant and oil mixed in the exhaust section at the exhaust section of the compressor 10 to be tested, the oil circulation rate of the refrigerant pipeline in the air-conditioning system loop is reduced, the measured value of the refrigerant flowmeter is more accurate, and the heat exchange calculation basically does not need to correct the oil circulation amount. By setting an oil storage tank 30 between the return oil pipe 40 and the high-efficiency oil separator 20, the oil separated by the high-efficiency oil separator 20 first enters the oil storage tank 30 and then enters the return oil pipe 40, which can effectively reduce the return oil temperature and avoid the return oil with too high temperature mixing with the refrigerant in the suction section of the compressor 10, causing the suction temperature to fluctuate. By using the oil storage property of the oil storage tank 30, the amount of oil refluxed to the compressor 10 through the return oil pipe 40 can be regulated, so that the total amount of oil in the compressor 10 can be increased or decreased in real time according to demand. By using the cooperation of the oil storage tank 30, the mass flowmeter 60 and the return oil valve 50, the control stability of the test system when subjected to flow disturbance can be improved.

[0062] Based on the same inventive concept, the present invention also proposes a compressor 10 performance test method, which uses the above-mentioned compressor 10 performance test system to perform performance test on the compressor 10, including an installation step and an oil circulation volume measurement step.

[0063] Among them, the installation steps include: setting a high-efficiency oil separator 20 in the exhaust section of the compressor 10 to be tested, and separating the refrigerant and oil mixed in the exhaust section; connecting the oil storage tank 30 with the high-efficiency oil separator 20, and collecting the oil separated by the high-efficiency oil separator 20 in the oil storage tank 30; using a return oil pipe 40 to connect the oil storage tank 30 and the suction section of the compressor 10; setting the return oil valve 50 on the return oil pipe 40; and setting the mass flow meter 60 on the return oil pipe 40 between the return oil valve 50 and the oil storage tank 30.

[0064] The oil circulation volume measurement step includes: obtaining an initial oil level height H in the oil storage tank 30, setting the initial oil level height H as a target oil level height H0, and recording it, starting the test system and the compressor 10, adjusting the opening of the oil return valve 50, and obtaining the actual measured oil level height H' in the oil storage tank 30 in real time, until the actual measured oil level height H' is stabilized within the floating range allowed by the target oil level height H0. At this time, the actual measured flow value of the mass flow meter 60 is the oil circulation volume required for the test.

[0065] It should be noted that the performance test of the compressor 10 includes a step of measuring the oil circulation amount and a step of controlling the oil circulation amount.

[0066] Among them, the oil circulation volume control steps are:

[0067] According to the test conditions, the target refrigerant flow MF and the target oil flow mF are preset. The oil circulation rate OCR can also be preset, and the formula of the oil circulation rate OCR, the target refrigerant flow MF and the target oil flow mF is: OCR = mF / MF.

[0068] The initial oil level H in the oil storage tank 30 is obtained, and the target oil level H0 in the oil storage tank 30 is preset to be H0=H-Ncm, where N is greater than or equal to 0; in this embodiment, N is 1, and in fact, N can also be other values. The oil return valve 50 is closed.

[0069] The compressor 10 is started, and the parameters of the compressor 10 are adjusted until the measured refrigerant flow rate MF' of the refrigerant separated by the high-efficiency oil separator 20 is stabilized within the floating range allowed by the target refrigerant flow rate MF.

[0070] The parameters of the compressor 10 include parameters such as the rotation speed of the compressor 10 and the opening degree of the expansion valve.

[0071] The oil return valve 50 is opened and the opening degree of the oil return valve 50 is adjusted to obtain the actual oil level height H' in the oil storage tank 30 in real time. The test system and the compressor 10 continue to operate until the actual oil level height H' is stabilized within the floating range allowed by the target oil level height H0, and the actual oil flow mF' obtained by the mass flow meter 60 at this time is recorded.

[0072] Since the inner shape of the oil storage tank 30 is designed as a cylinder with a constant cross section, the target oil level height H0 can be easily corrected proportionally to obtain a corrected target oil level height H1, wherein the target oil level height H0 and the corrected target oil level height H1 satisfy the following relationship: (H0-H1) / (H-H0)=(mF-mF') / mF'.

[0073] The correction method can be programmed into the control software, and the automatic correction can be performed by clicking on it. It should be noted that the control software for implementing the method of this embodiment can be conventional software, and this embodiment does not limit the specific implementation process of the control software.

[0074] Based on the corrected target oil level H1, continue to adjust the opening of the oil return valve 50 until the measured oil level H' is stabilized within the allowable floating range of the corrected target oil level H1 and the measured oil flow mF' is stabilized within the allowable floating range of the target oil flow mF.

[0075] The test method of this embodiment is applied in the air conditioning system test of a certain vehicle development project, and the fluctuation of the oil circulation rate measurement result of the compressor is less than ±0.4%. The oil circulation rate can be set within 5% for stable control, which basically meets the test requirements.

[0076] The test data is excerpted in Table 1:

[0077] Table 1 Test data of air conditioning system of a certain vehicle model

[0078]

[0079] It should be noted that, in the present invention, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0080] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features invented herein.

Claims

1. A compressor performance testing method, using a compressor performance testing system to test the compressor performance, characterized in that: The compressor performance testing system comprises: A high-efficiency oil separator is provided at the exhaust section of the compressor to be tested, and is used to separate the refrigerant and the oil mixed in the exhaust section, wherein the separated refrigerant continues to enter the refrigerant circulation pipe of the air conditioning system; An oil storage tank, connected to the high-efficiency oil separator, for collecting the engine oil separated by the high-efficiency oil separator, wherein the internal oil storage space of the oil storage tank is a cylindrical space with a uniform cross-section; An oil return pipe, connecting the oil storage tank and the suction section of the compressor; an oil return valve, disposed on the oil return pipe; and A mass flow meter, arranged on the oil return pipe and located between the oil return valve and the oil storage tank; A liquid level probe is provided in the oil storage tank for obtaining the actual measured oil level of the oil storage tank; The compressor performance test system further comprises a PID controller, which is electrically connected to the liquid level probe and the oil return valve, and adjusts the opening of the oil return valve according to a preset target oil level and the measured oil level of the liquid level probe, until the measured oil level is stabilized within the allowable range of the target oil level, at which time the measured flow value of the mass flow meter is the oil circulation amount required for the test; The oil storage tank is connected to a pressure source; The compressor performance test method comprises an installation step and an oil circulation measurement step; The installation steps include: installing a high-efficiency oil separator in the exhaust section of the compressor to be tested to separate the refrigerant and oil mixed in the exhaust section; connecting an oil storage tank with the high-efficiency oil separator to collect the oil separated by the high-efficiency oil separator in the oil storage tank; connecting the oil storage tank and the suction section of the compressor by an oil return pipe; installing an oil return valve on the oil return pipe; installing a mass flow meter on the oil return pipe between the oil return valve and the oil storage tank; The oil circulation volume measurement step includes: obtaining an initial oil level height H in the oil storage tank, setting the initial oil level height H as a target oil level height H0, and recording, starting the test system and the compressor, adjusting the opening of the oil return valve, and obtaining the measured oil level height H' in the oil storage tank in real time, until the measured oil level height H' is stabilized within the floating range allowed by the target oil level height H0, at which time, the measured flow value of the mass flow meter is the oil circulation volume required for the test; The following oil circulation volume control steps are also included: According to the test conditions, preset the target refrigerant flow MF and target oil flow mF; Obtain the initial oil level height H in the oil storage tank, preset the target oil level height H0=H-Ncm in the oil storage tank, where N is greater than or equal to 0; close the oil return valve; Starting the compressor, and adjusting the parameters of the compressor until the measured refrigerant flow rate MF' of the refrigerant separated by the high-efficiency oil separator is stabilized within the floating range allowed by the target refrigerant flow rate MF; The oil return valve is opened and the opening of the oil return valve is adjusted to obtain the actual oil level height H' in the oil storage tank in real time. The test system and the compressor continue to operate until the actual oil level height H' is stabilized within the floating range allowed by the target oil level height H0, and the actual oil flow mF' obtained by the mass flow meter at this time is recorded; The target oil level height H0 is proportionally corrected to obtain a corrected target oil level height H1, wherein the target oil level height H0 and the corrected target oil level height H1 satisfy the following relationship: (H0-H1) / (H-H0)=(mF-mF') / mF'; Based on the corrected target oil level H1, continue to adjust the oil return valve opening until the measured oil level H' is stabilized within the allowable floating range of the corrected target oil level H1 and the measured oil flow mF' is stabilized within the allowable floating range of the target oil flow mF.

2. The compressor performance testing method according to claim 1, characterized in that: The oil storage tank is provided with a refueling port and an oil drain port.

3. The compressor performance testing method according to claim 2, characterized in that: The oil storage tank is provided with an observation window.

4. The compressor performance testing method according to claim 1, characterized in that: The oil storage tank is connected with a cooling system.

5. The compressor performance testing method according to claim 1, characterized in that: The installation height of the oil storage tank is higher than the installation height of the mass flow meter.

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