Compressor oil circulation test method and oil circulation test framework

Abstract

The invention relates to the technical field of compressor testing, and discloses a compressor oil circulation testing method and an oil circulation testing framework. The test method comprises the following steps: placing the oil circulation test framework at a set environment temperature; adjusting a first oil return control valve to enable a first test branch of the oil circulation test framework to be set at a set first oil circulation rate; the first test branch is a connecting pipeline between the oil collecting side of the oil separator and the air suction side of the compressor; the compressor is adjusted according to the set first compressor rotating speed, and the throttling valve is adjusted according to the set first valve opening degree; after the compressor and the throttle valve are adjusted for a preset time length, the testing device is used for measuring operation parameters of a to-be-tested device in the oil circulation testing framework; the to-be-tested device comprises a compressor, a condenser, a throttle valve and an evaporator; and displaying the performance of the oil circulation test architecture according to the operation parameters. Thus, the rotating speed of the compressor and the valve opening degree of the throttle valve are continuously adjusted under the conditions of different set environment temperatures and set first oil circulation rates, and the parameter change condition of the to-be-tested device in the oil circulation test framework can be monitored; and therefore, a user can conveniently analyze the parameter change condition to know the performance of the oil circulation test framework in various aspects, and the operation performance of the refrigerating system in actual use can be conveniently improved.

Description

Technical Field

[0001] The present application relates to the technical field of compressor testing, and in particular to a compressor oil circulation testing method and an oil circulation testing architecture. Background Art

[0002] At present, there is a structure in which an oil separator is set inside the compressor. However, due to the limited internal space of the compressor, the size and structure of the built-in oil separator are limited, resulting in insufficient separation efficiency of the oil separator, and more lubricating oil entering the refrigeration system. Under certain extreme special working conditions, the compressor may not return enough oil and be damaged. Among them, the refrigeration system includes: a compressor, a condenser, and an evaporator. Therefore, in order to improve the separation efficiency of the oil separator, a separate oil separator is added between the compressor and the condenser to separate the refrigerant and the lubricating oil, and the lubricating oil separated by the oil separator is transmitted back to the compressor through the oil return circuit. However, after changing the oil return structure, the user does not know under what operating conditions the performance of the compressor can be better, and thus the performance of the entire refrigeration system can be better. Therefore, how to test the new refrigeration system in order to optimize the parameters of the refrigeration system actually used needs to be solved urgently.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0004] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical components or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0005] The embodiments of the present application provide a compressor oil circulation testing method and an oil circulation testing architecture to improve the performance of a refrigeration system.

[0006] The embodiment of the present application provides a test method for compressor oil circulation, which is applied to an oil circulation test framework, wherein the oil circulation test framework comprises: a compressor, an oil separator connected to the exhaust side of the compressor, a first oil return control valve connected between the oil collecting side of the oil separator and the suction side of the compressor, a condenser, a throttle valve, and an evaporator connected in sequence between the outlet side of the oil separator and the suction side of the compressor, and a test device arranged on a pipeline of the test framework; the test method comprises: placing the oil circulation test framework at a set ambient temperature; adjusting the first oil return control valve to make the oil circulation test framework The first test branch of the structure is placed at a set first oil circulation rate; the first test branch is a connecting pipe between the oil collecting side of the oil separator and the suction side of the compressor; the compressor is adjusted according to a set first compressor speed, and the throttle valve is adjusted according to a set first valve opening; after adjusting the compressor and the throttle valve for a preset time, the test device is used to measure the operating parameters of the device to be tested in the oil circulation test structure; the device to be tested includes the compressor, the condenser, the throttle valve, and the evaporator; the performance of the oil circulation test structure is displayed according to the operating parameters.

[0007] In the above-mentioned embodiment, by continuously adjusting the rotation speed of the compressor and the valve opening of the throttle valve under different set ambient temperatures and set first oil circulation rate conditions, the parameter changes of the device to be tested in the oil circulation test architecture can be monitored, which makes it convenient for users to analyze the parameter changes to obtain the performance of various aspects of the oil circulation test architecture, and thus makes it convenient for users to adjust the control parameters in the actual refrigeration system corresponding to the oil circulation test architecture to improve the operating performance of the actual refrigeration system.

[0008] Furthermore, the oil circulation test architecture also includes: an oil pump, which is arranged between the oil collecting side of the oil separator and the first oil return control valve; adjusting the first oil return control valve so that the first test branch of the oil circulation test architecture is placed at a set first oil circulation rate, including: adjusting the first oil return control valve and the oil pump so that the first test branch of the oil circulation test architecture is placed at the set first oil circulation rate.

[0009] In the above embodiment, an oil pump is arranged between the oil collecting side of the oil separator and the first oil return control valve, and the set first oil circulation rate is jointly adjusted by the oil pump and the first oil return control valve. Even if a problem occurs in one of the components, the oil circulation test architecture can be adjusted to the set first oil circulation rate, thereby making the oil circulation test architecture more fault-tolerant.

[0010] Furthermore, the oil circulation test architecture also includes: a temperature control device; the temperature control device is arranged on a pipeline between the oil collecting side of the oil separator and the suction side of the compressor; the temperature control device is used to regulate the lubricating oil flowing out of the oil separator to a set return oil temperature; the test method also includes: before adjusting the compressor according to the first compressor speed, placing the oil circulation test architecture at a set return oil temperature.

[0011] In the above embodiment, by setting a temperature control device, the oil return temperature is further controlled during the test process. The operating parameters of each device under test in the oil circulation test framework can be automatically measured under the conditions of the set ambient temperature, the set oil circulation rate and the set oil return temperature, so as to reflect the influence of the oil return temperature on the oil circulation test framework, so as to facilitate the user to adjust the control parameters in the refrigeration system actually used corresponding to the oil circulation test framework according to the influence of the oil return temperature on the oil circulation test framework, so as to improve the operating performance of the refrigeration system actually used.

[0012] Furthermore, the operating parameters include: refrigerant flow rate, suction temperature of the compressor, exhaust temperature of the compressor, suction pressure of the compressor, and exhaust pressure of the compressor; the performance of the oil circulation test architecture includes: the performance of the compressor; displaying the performance of the oil circulation test architecture according to the operating parameters includes: determining the volumetric efficiency of the compressor according to the refrigerant flow rate, the suction temperature of the compressor and the suction pressure of the compressor; determining the isentropic efficiency of the compressor according to the suction temperature of the compressor, the exhaust temperature of the compressor, the suction pressure of the compressor, and the exhaust pressure of the compressor; and displaying the performance of the compressor according to the volumetric efficiency and the isentropic efficiency.

[0013] In the above embodiment, the volumetric efficiency and isentropic efficiency of the compressor can be calculated by measuring parameters such as the refrigerant flow rate, the suction temperature of the compressor, the exhaust temperature of the compressor, the suction pressure of the compressor, and the exhaust pressure of the compressor. The volumetric efficiency and isentropic efficiency of the compressor allow users to intuitively view the performance of the compressor in the oil circulation test architecture, thereby facilitating users to improve the control parameters in the actual refrigeration system to improve the performance of the refrigeration system.

[0014] Furthermore, the operating parameters include: a first pipe inlet temperature of the condenser, a first pipe outlet temperature of the condenser, a second pipe inlet temperature of the condenser, a second pipe inlet temperature of the evaporator, a second pipe outlet temperature of the evaporator, and a first pipe inlet temperature of the evaporator; wherein the first pipe is a pipe connected to the oil circulation test framework; the second pipe is a pipe that exchanges heat with the first pipe; the performance of the oil circulation test framework includes: the heat exchange performance of the heat exchange device; the performance of the oil circulation test framework is displayed according to the operating parameters, including: determining the heat exchange efficiency of the condenser according to the first pipe inlet temperature of the condenser, the first pipe outlet temperature of the condenser, and the second pipe inlet temperature of the condenser; determining the heat exchange efficiency of the evaporator according to the second pipe inlet temperature of the evaporator, the second pipe outlet temperature of the evaporator, and the first pipe inlet temperature of the evaporator; and displaying the heat exchange performance of the heat exchange device according to the heat exchange efficiency of the condenser and the heat exchange efficiency of the evaporator.

[0015] In the above embodiment, the heat exchange efficiency of the condenser can be reflected by measuring the first pipe inlet temperature of the condenser, the first pipe outlet temperature of the condenser, and the second pipe inlet temperature of the condenser; the heat exchange efficiency of the evaporator can be reflected by measuring the second pipe inlet temperature of the evaporator, the second pipe outlet temperature of the evaporator, and the first pipe inlet temperature of the evaporator. The heat exchange efficiency of the condenser and the heat exchange efficiency of the evaporator facilitate the user to intuitively view the performance of the condenser and the evaporator in the oil circulation test framework, thereby facilitating the user to improve the control parameters of the refrigeration system actually used to improve the performance of the refrigeration system.

[0016] Furthermore, placing the oil circulation test architecture at a set ambient temperature also includes: injecting a set amount of lubricating oil into the compressor; triggering the oil circulation test architecture to test run at a set ambient temperature, a set second compressor speed, a set subcooling degree, and a set superheating degree until the oil circulation test architecture operates stably.

[0017] In the above implementation, the oil circulation test framework is tested before the test to ensure stable operation of the oil circulation test framework, thereby avoiding test parameter errors caused by unstable operation of the oil circulation test framework and making the acquired operation parameters of each component in the oil circulation test framework more accurate.

[0018] Furthermore, the testing device includes: a temperature sensor and / or a pressure sensor; determining whether the oil circulation test architecture is operating stably includes: obtaining a plurality of parameters to be evaluated at intervals of a preset time period; the parameters to be evaluated include: a temperature value measured by the temperature sensor and / or a pressure value measured by the pressure sensor; when the value changes of the plurality of parameters to be evaluated are within a preset range, determining that the oil circulation test architecture is operating stably.

[0019] In the above implementation, the temperature value measured by the temperature sensor changes slightly over a period of time, or the pressure value measured by the pressure sensor changes slightly over a period of time, reflecting that the parameters in the oil circulation test framework tend to be stable, which is conducive to obtaining stable values. Therefore, the change of temperature value and pressure value can be used to conveniently and accurately determine whether the oil circulation test framework is running stably.

[0020] Furthermore, the test method for the compressor oil circulation also includes: during the trial operation, triggering the temperature control device to operate and reading the temperature value of the temperature control device; when the temperature value changes, confirming that the temperature control device is operating normally.

[0021] In the above embodiment, by detecting whether the temperature control device is normal during the trial operation, the return oil temperature can be normally controlled when the oil circulation test architecture is tested, thereby improving the accuracy of the operating parameters of each component in the oil circulation test architecture.

[0022] Furthermore, the oil circulation test architecture also includes: the oil collecting side of the oil separator is connected to the condenser through a second oil return control valve; before adjusting the compressor according to the set first compressor speed, the compressor oil circulation test method also includes: adjusting the second oil return control valve to place the second test branch of the oil circulation test architecture at the set second oil circulation rate; the second test branch is a connecting pipe between the outlet side of the oil separator and the intake side of the compressor.

[0023] In the above-mentioned embodiment, by continuously adjusting the rotation speed of the compressor and the valve opening of the throttle valve under different conditions of set ambient temperatures, set first oil circulation rates and set second oil circulation rates, the parameter changes of the device to be tested in the oil circulation test architecture can be monitored, which makes it convenient for users to analyze the parameter changes to obtain the performance of various aspects of the oil circulation test architecture, and thus makes it convenient for users to adjust the control parameters in the actual refrigeration system corresponding to the oil circulation test architecture to improve the operating performance of the actual refrigeration system.

[0024] An embodiment of the present application provides an oil circulation test architecture, comprising: a compressor; an oil separator, wherein the exhaust port of the compressor is connected to the input side of the oil separator; a first return oil control valve, wherein the oil collecting side of the oil separator is connected to the suction side of the compressor through the first return oil control valve; a condenser, wherein the input side of the condenser is connected to the outlet side of the oil separator; an evaporator, wherein the input side of the evaporator is connected to the output side of the condenser; the output side of the evaporator is connected to the suction side of the compressor; a throttle valve, wherein the throttle valve is arranged on the connecting pipe between the condenser and the evaporator; an oil circulation meter, wherein the oil circulation meter is arranged on the connecting pipe between the condenser and the evaporator; a temperature sensor, wherein the temperature sensor is arranged on the pipe of the oil circulation test architecture for measuring temperature; a pressure sensor, wherein the pressure sensor is arranged on the pipe of the oil circulation test architecture for measuring pressure; and a flow meter, wherein the flow meter is arranged on the pipe of the oil circulation test architecture for measuring flow.

[0025] In the above-mentioned embodiment, by designing an oil circulation test architecture adapted to the actual operating refrigeration system, and arranging temperature sensors, pressure sensors, flow meters and oil circulation meters for measuring parameters on the oil circulation test architecture, it is possible for users to understand the operating parameters of each component under different control parameters, thereby automatically understanding the performance of each component.

[0026] Furthermore, the oil circulation test architecture also includes: an oil pump, and the first oil return control valve is connected to the oil separator through the oil pump.

[0027] In the above embodiment, considering that there is an oil pump in some refrigeration systems, the oil pump can be set to fit the setting of the refrigeration system during actual operation, so that the measured operating parameters of each component are more consistent with the parameters during actual operation.

[0028] Furthermore, the oil circulation test architecture further includes: an oil collecting tank, and the oil separator is connected to the first oil return control valve via the oil collecting tank.

[0029] In the above embodiment, by providing an oil collecting tank, it is possible to fit the setting of the refrigeration system during actual operation, so that the measured operating parameters of each component are more consistent with the parameters during actual operation.

[0030] Furthermore, the oil circulation test architecture also includes: a temperature control device, which is arranged on a pipeline between the oil separator and the first oil return control valve; the temperature control device is used to regulate the lubricating oil flowing out of the oil separator to a set oil return temperature.

[0031] In the above embodiment, by providing a temperature control device, the lubricating oil flowing out of the oil separator can be made to reach a set oil return temperature, thereby facilitating the reflection of the influence of different oil return temperatures on various components in the oil circulation test architecture.

[0032] Furthermore, the oil circulation test architecture further includes: a second oil return control valve, and the oil collecting side of the oil separator is connected to the condenser via the second oil return control valve.

[0033] In the above embodiment, considering that when an oil separator is not separately provided, the lubricating oil mixed in the refrigerant discharged from the exhaust side of the compressor will follow the refrigerant into the condenser, by providing a second oil return control valve, it is possible to simultaneously simulate the performance of the oil circulation test architecture under different operating conditions when an oil separator is not provided.

[0034] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] One or more embodiments are exemplarily described by corresponding drawings, and these exemplary descriptions and drawings do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are considered similar elements, and the drawings do not constitute a scale limitation, and wherein:

[0036] Figure 1 is a schematic diagram of a refrigeration system provided in an embodiment of the present application;

[0037] Figure 2 is a schematic diagram of an oil circulation test architecture provided in an embodiment of the present application;

[0038] Figure 3 is a schematic diagram of another oil circulation test architecture provided in an embodiment of the present application;

[0039] Figure 4 is a schematic diagram of another oil circulation test architecture provided in an embodiment of the present application;

[0040] Figure 5 is a schematic diagram of a compressor oil circulation test method provided in an embodiment of the present application;

[0041] Figure 6 It is a schematic diagram of a volumetric efficiency trend chart provided in an embodiment of the present application;

[0042] Figure 7 It is a schematic diagram of an isentropic efficiency trend chart provided in an embodiment of the present application;

[0043] Figure 8 It is a schematic diagram of a condenser efficiency trend chart provided in an embodiment of the present application.

[0044] Reference numerals:

[0045] 1: compressor; 2: oil separator; 3: oil collecting tank; 4: oil pump; 5: temperature control device; 6: first oil return control valve; 7: flow meter; 8: condenser; 9: oil circulation meter; 10: throttle valve; 11: evaporator; 12: temperature sensor; 13: pressure sensor; 14: second oil return control valve. DETAILED DESCRIPTION

[0046] In order to be able to understand the features and technical contents of the embodiments of the present application in more detail, the implementation of the embodiments of the present application is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present application. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0047] The terms "first", "second", etc. in the specification and claims of the embodiments of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the embodiments of the present application described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0048] Unless otherwise stated, the term "plurality" means two or more.

[0049] The term "correspondence" may refer to an association relationship or a binding relationship. The correspondence between A and B means that there is an association relationship or a binding relationship between A and B.

[0050] Combination Figure 1 As shown, the refrigeration system includes: a compressor 1, an oil separator 2, an oil pump 4, a first oil return control valve 6, a condenser 8, an evaporator 11, and a throttle valve 10. Among them, the exhaust port of the compressor 1 is connected to the oil separator 2; the oil separator 2 is connected to the suction side of the compressor 1 through the first oil return control valve 6; the input side of the condenser 8 is connected to the oil separator 2; the input side of the evaporator 11 is connected to the output side of the condenser 8; the output side of the evaporator 11 is connected to the suction side of the compressor 1; and the throttle valve 10 is arranged on the connecting pipe between the condenser 8 and the evaporator 11.

[0051] The refrigeration system further includes an oil pump 4 . One end of the oil pump 4 is connected to the oil separator 2 , and the other end of the oil pump 4 is connected to one end of the first oil return control valve 6 .

[0052] The refrigeration system further comprises an oil collecting tank 3. The oil separator 2 is connected to the oil pump 4 via the oil collecting tank 3.

[0053] Embodiment 1

[0054] Combination Figure 2 As shown, an oil circulation test framework is provided in the embodiment of the present application, including: a compressor 1, an oil separator 2, a first oil return control valve 6, a condenser 8, an evaporator 11, a throttle valve 10, an oil circulation meter 9, a temperature sensor 12, a pressure sensor 13 and a flow meter 7. Among them, the exhaust port of the compressor 1 is connected to the oil separator 2; one end of the first oil return control valve 6 is connected to the oil separator 2, and the other end of the first oil return control valve 6 is connected to the suction side of the compressor 1; the input side of the condenser 8 is connected to the oil separator 2; the input side of the evaporator 11 is connected to the output side of the condenser 8; the output side of the evaporator 11 is connected to the suction side of the compressor 1; the throttle valve 10 is arranged on the connecting pipe between the condenser 8 and the evaporator 11; the oil circulation meter 9 is arranged on the connecting pipe between the condenser 8 and the evaporator 11; the temperature sensor 12 is arranged on the pipe of the oil circulation test framework for measuring temperature; the pressure sensor 13 is arranged on the pipe of the oil circulation test framework for measuring pressure; the flow meter 7 is arranged on the pipe of the oil circulation test framework for measuring flow.

[0055] Combination Figure 2 As shown, in some embodiments, the oil circulation test architecture further includes: an oil pump 4. The first oil return control valve 6 is connected to the oil separator 2 through the oil pump 4.

[0056] In some embodiments, the oil circulation test framework further includes: an oil collecting tank 3. The oil separator 2 is connected to the first oil return control valve 6 through the oil collecting tank 3.

[0057] Exemplarily, the oil collecting side of the oil separator 2 is connected to one end of the oil collecting tank 3 , the other end of the oil collecting tank 3 is connected to one end of the oil pump 4 , and the other end of the oil pump 4 is connected to the first oil return control valve 6 .

[0058] Combination Figure 3 As shown, in some embodiments, the oil circulation test architecture further includes: a temperature control device 5. The temperature control device 5 is arranged on the pipeline between the oil collecting side of the oil separator 2 and the suction side of the compressor 1; the temperature control device 5 is used to adjust the lubricating oil flowing out of the oil separator 2 to a set return oil temperature.

[0059] Exemplarily, the oil collecting side of the oil separator 2 is connected to one end of the oil collecting tank 3 , the other end of the oil collecting tank 3 is connected to one end of the oil pump 4 , and the other end of the oil pump 4 is connected to the first oil return control valve 6 through the temperature control device 5 .

[0060] Combination Figure 4As shown, in some embodiments, the oil circulation test architecture further includes: a second oil return control valve 14. The oil collecting side of the oil separator 2 is connected to the condenser 8 through the second oil return control valve 14.

[0061] Exemplarily, the oil collecting side of the oil separator 2 is connected to one end of the oil collecting tank 3, the other end of the oil collecting tank 3 is connected to one end of the oil pump 4, the other end of the oil pump 4 is connected to one end of the second oil return control valve 14, and the other end of the second oil return control valve 14 is connected to the condenser 8.

[0062] In some embodiments, multiple temperature sensors 12 and multiple pressure sensors 13 may be provided. For example, a temperature sensor 12 and a pressure sensor 13 may be provided on the pipeline between the throttle valve 10 and the condenser 8, and a temperature sensor 12 and a pressure sensor 13 may be provided on the pipeline between the evaporator 11 and the compressor 1. In this case, the degree of subcooling of the system may be determined by the value of the temperature sensor 12 and the value of the pressure sensor 13 provided on the pipeline between the throttle valve 10 and the condenser 8. The degree of superheat of the system may be determined by the value of the temperature sensor 12 and the value of the pressure sensor 13 provided on the pipeline between the evaporator 11 and the compressor 1.

[0063] Exemplarily, the degree of subcooling can be calculated in the following manner: searching the first saturation temperature corresponding to the outlet pressure of the condenser 8 in a preset first saturation temperature database; calculating the outlet temperature of the condenser 8 minus the first saturation temperature to obtain the degree of subcooling. The temperature sensor 12 provided on the pipeline between the throttle valve 10 and the condenser 8 is used to measure the outlet temperature of the condenser 8, and the pressure sensor 13 provided on the pipeline between the throttle valve 10 and the condenser 8 is used to measure the outlet pressure of the condenser 8. The first saturation temperature database stores the corresponding relationship between the outlet pressure of the condenser 8 and the first saturation temperature.

[0064] Exemplarily, the superheat degree may be calculated in the following manner: searching the second saturation temperature corresponding to the outlet pressure of the evaporator 11 in a preset second saturation temperature database; calculating the outlet temperature of the evaporator 11 minus the second saturation temperature to obtain the superheat degree. The temperature sensor 12 provided on the pipeline between the evaporator 11 and the compressor 1 is used to measure the outlet temperature of the evaporator 11, and the pressure sensor 13 provided on the pipeline between the evaporator 11 and the compressor 1 is used to measure the outlet pressure of the evaporator 11.

[0065] In some embodiments, multiple flow meters 7 may be provided, for example, a flow meter 7 is provided on the pipeline between the first oil return control valve 6 and the compressor 1 , and a flow meter 7 is also provided on the pipeline between the condenser 8 and the throttle valve 10 .

[0066] In some embodiments, the oil circulation meter 9 may be disposed on the pipeline between the condenser 8 and the evaporator 11 .

[0067] Embodiment 2

[0068] Combination Figure 5 As shown, a compressor oil circulation test method is provided in an embodiment of the present application, which is applied to the oil circulation test framework of embodiment 1. The compressor oil circulation test method includes:

[0069] Step S101 , placing the oil circulation test structure at a set ambient temperature.

[0070] In some embodiments, the ambient temperature refers to the temperature of the space where the oil circulation test framework is placed. The ambient temperature can be obtained by setting a temperature sensor in the space where the oil circulation test framework is placed and reading the value of the temperature sensor. The space where the oil circulation test framework is placed is, for example, a room where the oil circulation test framework is placed.

[0071] In some embodiments, a temperature regulating device may be provided in the space where the oil circulation test framework is placed, and the temperature regulating device may be triggered to operate so that the ambient temperature reaches a set ambient temperature.

[0072] In the above embodiment, the temperature adjustment device may be an air conditioner. When the ambient temperature is lower than the set ambient temperature, the air conditioner is triggered to start the heating mode. When the ambient temperature is higher than the set ambient temperature, the air conditioner is triggered to start the cooling mode.

[0073] Step S102 , adjusting the first oil return control valve to set the first test branch of the oil circulation test structure to a set first oil circulation rate.

[0074] The first test branch is a connecting pipe between the oil collecting side of the oil separator and the suction side of the compressor.

[0075] Exemplarily, the second valve opening of the first oil return control valve may be continuously adjusted until the oil circulation rate of the first test branch reaches a set first oil circulation rate.

[0076] In some embodiments, step S102 may also be: adjusting the first oil return control valve and the oil pump to place the first test branch of the oil circulation test architecture at a set first oil circulation rate.

[0077] For example, the oil pump 4 can be adjusted to a set oil pump speed in advance, and then the second valve opening of the first oil return control valve 6 is continuously adjusted until the oil circulation rate of the first test branch reaches the set first oil circulation rate. The first oil return control valve 6 can also be adjusted to a set valve opening in advance, and then the oil pump speed of the oil pump 4 is continuously adjusted until the oil circulation rate of the first test branch reaches the set first oil circulation rate.

[0078] As another example, a set ambient temperature can be obtained. When the set ambient temperature is lower than the set temperature, the first oil return control valve 6 and the oil pump 4 are adjusted so that the first test branch of the oil circulation test structure is set to the set first oil circulation rate. When the set ambient temperature is higher than the set temperature, only the first oil return control valve 6 is adjusted so that the first test branch of the oil circulation test structure is set to the set first oil circulation rate. In this way, considering that the oil pump of the refrigeration system is set according to the use requirements. Usually, the ambient temperature is related to the use requirements. Determining whether to increase the oil pump to participate in the adjustment by the ambient temperature can make the test more realistic.

[0079] Optionally, the first oil circulation rate of the first test branch is calculated by the refrigerant flow rate and the lubricating oil flow rate. Exemplarily, the oil circulation rate of the first test branch = the lubricating oil flow rate measured by the first test branch / (the lubricating oil flow rate measured by the first test branch + the refrigerant flow rate).

[0080] In some embodiments, the compressor oil circulation test method further includes: before adjusting the compressor 1 according to the set first compressor speed, adjusting the second oil return control valve 14 to set the second test branch of the oil circulation test architecture to a set second oil circulation rate.

[0081] The second test branch is a connecting pipe between the air outlet side of the oil separator and the air intake side of the compressor.

[0082] For example, the third valve opening of the second oil return control valve 14 can be continuously adjusted until the oil circulation rate of the second test branch reaches the set second oil circulation rate. An oil circulation meter can be set on the second test branch to measure the oil circulation rate of the second test branch.

[0083] In some embodiments, the compressor oil circulation test method further includes: before adjusting the compressor 1 according to the set first compressor speed, adjusting the temperature control device 5 to make the oil circulation test structure at a set oil return temperature.

[0084] Exemplarily, a temperature sensor is provided on the pipe between the temperature control device 5 and the compressor to measure the actual oil return temperature. When the actual oil return temperature is lower than the set oil return temperature, the heating temperature of the temperature control device 5 is increased. When the actual oil return temperature is higher than the set oil return temperature, the heating temperature of the temperature control device 5 is decreased. In this way, by controlling the oil return temperature, it is convenient for the user to understand the influence of the oil return temperature on the oil circulation test architecture, and adjust the control parameters in the refrigeration system actually used corresponding to the oil circulation test architecture, so as to improve the operating performance of the refrigeration system actually used.

[0085] Exemplarily, before testing the oil circulation test architecture, that is, before adjusting the compressor according to a set first compressor speed, the first test branch can be placed at a set first oil circulation rate, the second test branch can be placed at a set second oil circulation rate, and the oil circulation test architecture can be placed at a set oil return temperature.

[0086] As another example, before testing the oil circulation test architecture, only the first test branch may be placed at a set first oil circulation rate, and the oil circulation test architecture may be placed at a set oil return temperature.

[0087] Step S103, adjusting the compressor according to the set first compressor speed, and adjusting the throttle valve according to the set first valve opening.

[0088] It should be understood that when the compressor speed increases, its refrigeration capacity will generally increase, which means that the refrigeration system needs to process more refrigerant to provide sufficient cooling capacity. Therefore, in order to balance the cooling capacity with the cooling demand, the valve opening of the throttle valve will generally increase with the compressor speed. The compressor speed to be tested and the valve opening to be tested corresponding to the compressor speed can be pre-set and saved to a preset database to be tested. When a test is required, the compressor speed to be tested is directly read from the database to be tested as the first compressor speed, and the valve opening corresponding to the first compressor speed is used as the first valve opening.

[0089] It is worth noting that the same compressor speed can correspond to multiple valve openings. When performing test adjustments, each set of compressor speed and valve opening should be tested.

[0090] Step S104 , after adjusting the compressor and the throttle valve for a preset time, using a test device to measure operating parameters of the device under test in the oil circulation test framework.

[0091] Among them, the devices to be tested include a compressor, a condenser, a throttle valve, and an evaporator.

[0092] In some embodiments, if a compressor speed corresponds to multiple valve openings, the compressor speed does not need to be changed, and only the valve opening of the throttle valve 10 needs to be adjusted. At this time, after the throttle valve 10 is adjusted, the compressor 1 and the throttle valve 10 are adjusted.

[0093] Considering that after the compressor speed of the compressor 1 and the opening of the throttle valve 10 are changed, it takes a certain amount of time for the test architecture to reach a stable state. By obtaining the operating parameters of the device after adjusting the compressor 1 and the throttle valve 10 for a preset time, the operating parameters of the device obtained can be more accurate. Among them, the value of the preset time can be set by the engineer based on experience, for example: 2 minutes, 5 minutes, etc.

[0094] In some embodiments, the device under test further includes: a temperature control device, an oil pump, a first oil return control valve, an oil collecting tank, a second oil return control valve, etc.

[0095] Exemplarily, operating parameters of the device to be tested in the oil circulation test architecture, such as: the suction pressure of compressor 1, the exhaust pressure of compressor 1, the suction temperature of compressor 1, the exhaust temperature of compressor 1, the input voltage of compressor 1, the operating current of compressor 1, the output power of compressor 1, the refrigerant flow rate, the pipe inlet temperature of condenser 8, the pipe outlet temperature of condenser 8, the flow rate of condenser 8, the pipe inlet temperature of evaporator 11, the pipe outlet temperature of evaporator 11, the flow rate of evaporator 11, the inlet pressure of throttle valve 10, the inlet temperature of throttle valve 10, the inlet temperature of temperature control device 5, the outlet temperature of temperature control device 5, the lubricating oil flow rate, the speed of oil pump 4, the second valve opening of the first return oil control valve 6, the oil amount in the oil collecting tank 3, the third valve opening of the second return oil control valve 14, etc.

[0096] It should be understood that there are two pipes in the heat exchanger, one for flowing through the heat exchange medium and the other for flowing through the heat exchanged medium. Therefore, for the condenser, evaporator and temperature control device. The pipe inlet temperature and pipe outlet temperature of the two pipes can be measured respectively. Among them, the first pipe is a pipe for flowing through the heat exchanged medium, that is, a pipe in the heat exchanger connected to the refrigeration system to participate in the flow of refrigerant, that is, a pipe in the heat exchanger connected to the oil circulation test structure. Among them, the second pipe is a pipe for flowing through the heat exchange medium, that is, a pipe that exchanges heat with the first pipe. Exemplarily, the first pipe of the condenser, that is, the pipe of the condenser for flowing through the heat exchanged medium. The second pipe of the condenser, that is, the pipe of the condenser for flowing through the heat exchanged medium. The first pipe of the evaporator, that is, the pipe of the evaporator for flowing through the heat exchanged medium. The second pipe of the evaporator, that is, the pipe of the evaporator for flowing through the heat exchanged medium.

[0097] Step S105 , displaying the performance of the oil circulation test architecture according to the operating parameters.

[0098] In some embodiments, the operating parameters include: refrigerant flow rate, suction temperature of the compressor, exhaust temperature of the compressor, suction pressure of the compressor, and exhaust pressure of the compressor; the performance of the oil circulation test architecture includes: the performance of the compressor; step S104 may include: determining the volumetric efficiency of the compressor based on the refrigerant flow rate, the suction temperature of the compressor and the suction pressure of the compressor; determining the isentropic efficiency of the compressor based on the suction temperature of the compressor, the exhaust temperature of the compressor, the suction pressure of the compressor, and the exhaust pressure of the compressor; and displaying the performance of the compressor based on the volumetric efficiency and the isentropic efficiency.

[0099] In one embodiment of the present invention, the volumetric efficiency of the compressor can be determined based on the refrigerant flow rate, the suction temperature of the compressor, and the suction pressure of the compressor by searching for density in a preset thermophysical property table using the suction temperature of the compressor and the suction pressure of the compressor; calculating M ref =h×n×ρ1×t,η1=M r / M ref Among them, ρ1 is the density, h is the cylinder volume of the compressor, n is the compressor speed, t is the preset time coefficient, η1 is the volumetric efficiency of the compressor, M r is the refrigerant flow rate, M ref is the mass flow rate.

[0100] In one way of the above embodiment, the isentropic efficiency of the compressor can be determined according to the suction temperature of the compressor, the exhaust temperature of the compressor, the suction pressure of the compressor, and the exhaust pressure of the compressor: by using the suction temperature of the compressor and the suction pressure of the compressor to find the inlet enthalpy value of the compressor and the entropy value of the compressor in a preset thermophysical property table; by using the exhaust temperature of the compressor and the exhaust pressure of the compressor to find the outlet enthalpy value of the compressor in a preset thermophysical property table; using the entropy value of the compressor and the exhaust pressure of the compressor in a preset thermophysical property table to find the isentropic exhaust temperature of the compressor; using the isentropic exhaust temperature and the exhaust pressure of the compressor in a preset thermophysical property table to find the post-compression enthalpy value of the compressor. Calculate η2=(h5'-h6) / (h5-h6) to obtain the isentropic efficiency of the compressor. Wherein, η2 is the isentropic efficiency of the compressor, h5' is the post-compression enthalpy value of the compressor, h6 is the inlet enthalpy value of the compressor, and h5 is the outlet enthalpy value of the compressor.

[0101] In one manner of the above embodiment, displaying the performance of the compressor based on volumetric efficiency and isentropic efficiency may include: forming a volumetric efficiency trend graph with the volumetric efficiency calculated based on the operating parameters measured at different first compressor speeds and first valve openings; and forming an isentropic efficiency trend graph with the isentropic efficiency calculated based on the operating parameters measured at different first compressor speeds and first valve openings.

[0102] For example, the volumetric efficiency of different oil circulation rates can be formed into a volumetric efficiency trend chart, such as Figure 6 As shown, the horizontal axis is the oil circulation rate (OCR) and the vertical axis is the volumetric efficiency. The isentropic efficiency of different oil circulation rates can be formed into an isentropic efficiency trend chart, such as Figure 7 As shown, the abscissa is the oil circulation rate, and the ordinate is the isentropic efficiency. The oil circulation rate of the abscissa can be set to the oil circulation rate of the first test branch or the oil circulation rate of the second test branch according to the test requirements.

[0103] In some embodiments, the operating parameters include: the first pipe inlet temperature of the condenser, the first pipe outlet temperature of the condenser, the second pipe inlet temperature of the condenser, the second pipe inlet temperature of the evaporator, the second pipe outlet temperature of the evaporator, and the first pipe inlet temperature of the evaporator; the performance of the oil circulation test framework includes: the heat exchange performance of the heat exchange device. Step S104 may include: determining the heat exchange efficiency of the condenser according to the first pipe inlet temperature of the condenser, the first pipe outlet temperature of the condenser, and the second pipe inlet temperature of the condenser; determining the heat exchange efficiency of the evaporator according to the second pipe inlet temperature of the evaporator, the second pipe outlet temperature of the evaporator, and the first pipe inlet temperature of the evaporator; and displaying the heat exchange performance of the heat exchange device according to the heat exchange efficiency of the condenser and the heat exchange efficiency of the evaporator.

[0104] In the above embodiment, the heat exchange efficiency of the condenser can be determined according to the first pipe inlet temperature of the condenser, the first pipe outlet temperature of the condenser, and the second pipe inlet temperature of the condenser: ε1 is the heat exchange efficiency of the condenser, T2 is the first pipe inlet temperature of the condenser, T3 is the first pipe outlet temperature of the condenser, and T4 is the second pipe inlet temperature of the condenser.

[0105] In the above embodiment, the heat exchange efficiency of the evaporator can be determined according to the inlet temperature of the second pipe of the evaporator, the outlet temperature of the second pipe of the evaporator, and the inlet temperature of the first pipe of the evaporator: ε2 is the heat exchange efficiency of the evaporator, T5 is the second pipe inlet temperature of the evaporator, T6 is the second pipe outlet temperature of the evaporator, and T7 is the first pipe inlet temperature of the evaporator.

[0106] In the above embodiment, displaying the heat exchange performance of the heat exchange device according to the heat exchange efficiency of the condenser and the heat exchange efficiency of the evaporator may include: forming a condenser efficiency trend graph with the heat exchange efficiency of the condenser calculated based on the operating parameters measured by different first compressor speeds and first valve openings; forming an evaporator efficiency trend graph with the heat exchange efficiency of the evaporator calculated based on the operating parameters measured by different first compressor speeds and first valve openings.

[0107] For example, the heat exchange efficiency of the condenser (Cond) with different oil circulation rates can be formed into a condenser efficiency trend chart, such as Figure 8 As shown, the horizontal axis is the oil circulation rate and the vertical axis is the heat exchange efficiency of the condenser.

[0108] In order to facilitate user viewing, one or more of the volumetric efficiency trend chart, isentropic efficiency trend chart, condenser performance trend chart, and evaporator performance trend chart can be combined into one chart for display.

[0109] In other embodiments, the operating parameters include: the first pipe inlet temperature of the condenser 8, the first pipe outlet temperature of the condenser 8, the first pipe inlet pressure of the condenser 8, the first pipe outlet pressure of the condenser 8, the inlet temperature of the throttle valve 10, the inlet pressure of the throttle valve 10, the first pipe outlet temperature of the evaporator 11, the first pipe outlet pressure of the evaporator 11, and the refrigerant flow rate; the performance of the oil circulation test architecture includes: the heat exchange performance of the heat exchange device; step S104 may include: determining the heat exchange performance of the condenser 8 according to the first pipe inlet temperature of the condenser 8, the first pipe outlet temperature of the condenser 8, the first pipe inlet pressure of the condenser 8, the first pipe outlet pressure of the condenser 8, and the refrigerant flow rate; determining the heat exchange performance of the evaporator 11 according to the inlet temperature of the throttle valve 10, the inlet pressure of the throttle valve 10, the first pipe outlet temperature of the evaporator 11, the first pipe outlet pressure of the evaporator 11, and the refrigerant flow rate; and displaying the heat exchange performance of the heat exchange device according to the heat exchange performance of the condenser and the heat exchange performance of the evaporator.

[0110] In the above embodiment, the heat exchange performance of the condenser 8 is determined according to the first pipe inlet temperature of the condenser 8, the first pipe outlet temperature of the condenser 8, the first pipe inlet pressure of the condenser 8, the first pipe outlet pressure of the condenser 8, and the flow rate of the condenser 8, which can be calculated as follows: QE1 = Mr × (he1-he2). Among them, QE1 is the heat exchange performance of the condenser, he2 is the enthalpy of the outlet refrigerant of the condenser, and he1 is the enthalpy of the inlet refrigerant of the condenser.

[0111] The enthalpy of the inlet refrigerant of the condenser 8 can be found by using the first pipe inlet temperature of the condenser 8 and the first pipe inlet pressure of the condenser 8 in the preset thermal property table, and the enthalpy of the outlet refrigerant of the condenser 8 can be found by using the first pipe outlet temperature of the condenser 8 and the first pipe outlet pressure of the condenser 8. The thermal property table stores the corresponding relationship between the first pipe inlet temperature of the condenser 8, the first pipe inlet pressure of the condenser 8 and the enthalpy of the inlet refrigerant. The thermal property table also stores the corresponding relationship between the first pipe outlet temperature of the condenser 8, the first pipe outlet pressure of the condenser 8 and the enthalpy of the outlet refrigerant of the condenser 8.

[0112] In the above embodiment, the heat exchange performance of the evaporator 11 is determined according to the inlet temperature of the throttle valve 10, the inlet pressure of the throttle valve 10, the outlet temperature of the first pipeline of the evaporator 11, the outlet pressure of the first pipeline of the evaporator 11, and the refrigerant flow rate, which can be calculated as follows: QE2 = Mr × (he4-he3). Among them, QE2 is the heat exchange performance of the evaporator, he4 is the enthalpy of the outlet refrigerant of the evaporator, and he3 is the enthalpy of the inlet refrigerant of the evaporator.

[0113] The enthalpy of the inlet refrigerant of the evaporator 11 can be found by using the inlet temperature of the throttle valve 10 and the inlet pressure of the throttle valve 10 in the preset thermophysical property table, and the enthalpy of the outlet refrigerant of the evaporator 11 can be found by using the outlet temperature of the first pipe of the evaporator 11 and the outlet pressure of the first pipe of the evaporator 11. The thermophysical property table stores the corresponding relationship between the inlet temperature of the throttle valve 10, the inlet pressure of the throttle valve 10 and the enthalpy of the inlet refrigerant of the evaporator 11. The thermophysical property table also stores the corresponding relationship between the outlet temperature of the first pipe of the evaporator 11, the outlet pressure of the first pipe of the evaporator 11 and the enthalpy of the outlet refrigerant of the evaporator 11.

[0114] In the above embodiment, the heat exchange performance of the heat exchange device is displayed according to the heat exchange performance of the condenser and the heat exchange performance of the evaporator, which can include: forming a condenser performance trend graph based on the heat exchange performance of the condenser calculated by the operating parameters measured by different first compressor speeds and first valve openings; forming an evaporator performance trend graph based on the heat exchange performance of the evaporator calculated by the operating parameters measured by different first compressor speeds and first valve openings.

[0115] In some embodiments, placing the oil circulation test architecture at a set ambient temperature further includes: injecting a set amount of lubricating oil into compressor 1; triggering the oil circulation test architecture to run a trial at a set ambient temperature, a set second compressor speed, a set subcooling degree, and a set superheating degree until the oil circulation test architecture operates stably.

[0116] In the above embodiment, the engineer may set the set oil volume based on experience to ensure the normal operation of the compressor 1. The engineer may inject the set oil volume into the compressor 1, or the manufacturer may inject the set oil volume into the compressor 1 in advance.

[0117] In the above embodiment, the testing device includes: a temperature sensor and / or a pressure sensor; determining whether the oil circulation test architecture is running stably includes: obtaining multiple parameters to be evaluated at intervals of a preset time period; the parameters to be evaluated include: the temperature value measured by the temperature sensor 12 and / or the pressure value of the pressure sensor 13; when the value changes of the multiple parameters to be evaluated are within a preset range, determining that the oil circulation test architecture is running stably.

[0118] It is understood that the preset range may include: a preset temperature variation range and / or a preset pressure variation range. When the parameter to be evaluated is a temperature value, it is evaluated whether the value variation of the temperature value is within the preset temperature variation range. When the parameter to be evaluated is a pressure value, it is evaluated whether the value variation of the pressure value is within the preset pressure variation range.

[0119] Exemplarily, the preset time period is 30 seconds, and the temperature value A measured by the temperature sensor 12 and the pressure value B of the pressure sensor 13 are obtained. After an interval of 30 seconds, the temperature value C measured by the temperature sensor 12 and the pressure value D of the pressure sensor 13 are obtained. The temperature change value is obtained by subtracting the temperature value A from the temperature value C. The pressure change value is obtained by subtracting the pressure value B from the pressure value D. When the temperature change value is within the preset temperature change range and the pressure change value is within the preset pressure change range, it is determined that the oil circulation test architecture is stably operating.

[0120] In the above embodiment, during the trial operation, the temperature control device 5 can also be triggered to run and the temperature value of the temperature control device 5 can be read; when the temperature value of the temperature control device 5 changes, it is confirmed that the temperature control device 5 is running normally.

[0121] In some embodiments, before placing the oil circulation test framework under the set ambient temperature and set oil circulation rate conditions, it may also include: evacuating and pressurizing the pipeline of the oil circulation test framework, filling the pipeline with refrigerant after meeting the airtightness requirements, and recording the specific value of the refrigerant.

[0122] For example, a proper amount of lubricating oil can be injected into the compressor 1 in advance to ensure that the compressor 1 can operate normally. Figure 1The oil circulation test framework shown has the components and sensors installed in place. The oil circulation test framework is vacuumed and pressure-maintained. After meeting the airtightness requirements, it is filled with refrigerant and the refrigerant value is recorded. Start the test environment, according to the ambient temperature of 38°C, the speed of compressor 1 is Max×80% rpm (revolutions / minute), the subcooling is 10K (thermodynamic temperature unit), the superheat is 5K, the exhaust pressure is 1.5MPa (megapascals), and the suction pressure is 0.3MPa. Test run until the oil circulation test framework runs stably. Among them, Max is the rated maximum speed of the compressor. During the test run, the oil pump 4 and the first return oil control valve 6 are not running. Trigger the temperature control device 5 to run, and read the temperature value of the temperature control device 5. If the temperature value changes, it is confirmed that the temperature control device 5 is operating normally; if the temperature value does not change, it is confirmed that the temperature control device 5 is abnormal. After the test run is completed, the oil circulation test framework is shut down for 15 minutes. Then, the speed of the compressor 1 to be tested and the valve opening corresponding to the speed of the compressor 1 are obtained; the oil circulation test framework is placed under the conditions of the set ambient temperature and the set oil circulation rate, the compressor 1 is adjusted according to the speed of the compressor 1, and the throttle valve 10 is adjusted according to the valve opening; after adjusting the compressor 1 and the throttle valve 10 for a preset time, the operating parameters of each device in the oil circulation test framework are obtained; and the performance of the device is determined according to the operating parameters. Then, the oil circulation test framework is placed under the conditions of the set ambient temperature, the set oil circulation rate and the set return oil temperature, the compressor 1 is re-adjusted according to the speed of the compressor 1, and the throttle valve 10 is adjusted according to the valve opening; after adjusting the compressor 1 and the throttle valve 10 for a preset time, the operating parameters of the compressor, condenser, throttle valve, evaporator and other devices in the oil circulation test framework are obtained; the performance of the compressor and the heat exchange performance of the heat exchange device are displayed according to the operating parameters.

[0123] In some embodiments, after displaying the performance of the oil circulation test architecture according to the operating parameters, the method further includes: displaying the operating parameters, so that the user can intuitively view the changes in the operating parameters.

[0124] The technical solution of the embodiment of the present application can be embodied in the form of a software product, which is stored in a storage medium and includes one or more instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in the embodiment of the present application. The aforementioned storage medium can be a non-transient storage medium, including: a USB flash drive, a mobile hard disk, a read-only memory, a random access memory, a magnetic disk or an optical disk, etc., which can store program codes, or a transient storage medium.

[0125] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.

[0126] The above description is only an embodiment of the present application and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application. At the same time, the above embodiments can be combined with each other to form new embodiments without conflict.

Claims

1. A method for testing compressor oil circulation, characterized in that: Applied to an oil circulation test framework, the oil circulation test framework comprises: a compressor, an oil separator connected to the exhaust side of the compressor, a first oil return control valve connected between the oil collecting side of the oil separator and the suction side of the compressor, a condenser, a throttle valve, and an evaporator connected in sequence between the outlet side of the oil separator and the suction side of the compressor, and a test device arranged on a pipeline of the test framework; the method comprises: Placing the oil circulation test framework at a set ambient temperature; Regulating the first oil return control valve to place the first test branch of the oil circulation test architecture at a set first oil circulation rate; the first test branch is a connecting pipe between the oil collecting side of the oil separator and the suction side of the compressor; adjusting the compressor according to a set first compressor speed, and adjusting the throttle valve according to a set first valve opening; After adjusting the compressor and the throttle valve for a preset time, using the test device to measure the operating parameters of the device under test in the oil circulation test framework; the device under test includes the compressor, the condenser, the throttle valve, and the evaporator; The performance of the oil circulation test architecture is demonstrated according to the operating parameters.

2. The method according to claim 1, characterized in that The oil circulation test framework further includes: an oil pump, the oil pump being arranged between the oil collecting side of the oil separator and the first oil return control valve; adjusting the first oil return control valve so that the first test branch of the oil circulation test framework is placed at a set first oil circulation rate, including: The first oil return control valve and the oil pump are adjusted to place the first test branch of the oil circulation test architecture at a set first oil circulation rate.

3. The method according to claim 1, characterized in that The oil circulation test architecture further includes: a temperature control device; the temperature control device is arranged on a pipeline between the oil collecting side of the oil separator and the suction side of the compressor; the temperature control device is used to regulate the lubricating oil flowing out of the oil separator to a set oil return temperature; the method further includes: Before adjusting the compressor according to the set first compressor speed, the temperature control device is adjusted to make the oil circulation test structure at the set oil return temperature.

4. The method according to claim 1, characterized in that: The operating parameters include: refrigerant flow, compressor suction temperature, compressor exhaust temperature, compressor suction pressure, compressor exhaust pressure; the performance of the oil circulation test architecture includes: compressor performance; the performance of the oil circulation test architecture is displayed according to the operating parameters, including: determining the volumetric efficiency of the compressor according to the refrigerant flow rate, the suction temperature of the compressor and the suction pressure of the compressor; Determining the isentropic efficiency of the compressor according to the suction temperature of the compressor, the exhaust temperature of the compressor, the suction pressure of the compressor, and the exhaust pressure of the compressor; The performance of the compressor is demonstrated in terms of the volumetric efficiency and the isentropic efficiency.

5. The method according to claim 1, characterized in that The operating parameters include: the first pipe inlet temperature of the condenser, the first pipe outlet temperature of the condenser, the second pipe inlet temperature of the condenser, the second pipe inlet temperature of the evaporator, the second pipe outlet temperature of the evaporator, and the first pipe inlet temperature of the evaporator; wherein the first pipe is a pipe connected to the oil circulation test framework; the second pipe is a pipe that exchanges heat with the first pipe; the performance of the oil circulation test framework includes: the heat exchange performance of the heat exchange device; the performance of the oil circulation test framework is displayed according to the operating parameters, including: Determine the heat exchange efficiency of the condenser according to the first pipe inlet temperature of the condenser, the first pipe outlet temperature of the condenser, and the second pipe inlet temperature of the condenser; Determine the heat exchange efficiency of the evaporator according to the second pipe inlet temperature of the evaporator, the second pipe outlet temperature of the evaporator, and the first pipe inlet temperature of the evaporator; The heat exchange performance of the heat exchange device is demonstrated according to the heat exchange efficiency of the condenser and the heat exchange efficiency of the evaporator.

6. The method according to claim 3, characterized in that Before placing the oil circulation test framework at a set ambient temperature, the method further comprises: Inject a set amount of lubricating oil into the compressor; The oil circulation test architecture is triggered to perform a trial operation under a set ambient temperature, a set second compressor speed, a set subcooling degree, and a set superheating degree until the oil circulation test architecture operates stably.

7. The method according to claim 6, characterized in that The test device includes: a temperature sensor and / or a pressure sensor; determining whether the oil circulation test architecture is running stably includes: Acquire multiple parameters to be evaluated at intervals of a preset time period; the parameters to be evaluated include: a temperature value measured by a temperature sensor and / or a pressure value measured by a pressure sensor; When the numerical changes of the plurality of parameters to be evaluated are within a preset range, it is determined that the oil circulation test architecture is operating stably.

8. The method according to claim 6, characterized in that The method further comprises: During the trial operation, the temperature control device is triggered to operate, and the temperature value of the temperature control device is read; When the temperature value changes, it is confirmed that the temperature control device operates normally.

9. The method according to any one of claims 1 to 8, characterized in that: The oil circulation test architecture further includes: the oil collecting side of the oil separator is connected to the condenser through a second oil return control valve; before adjusting the compressor according to the set first compressor speed, the method further includes: The second oil return control valve is adjusted to place the second test branch of the oil circulation test architecture at a set second oil circulation rate; the second test branch is a connecting pipe between the outlet side of the oil separator and the suction side of the compressor.

10. An oil circulation test framework, characterized in that: include: compressor; An oil separator, wherein the exhaust port of the compressor is connected to the input side of the oil separator; a first oil return control valve, the oil collecting side of the oil separator is connected to the suction side of the compressor through the first oil return control valve; A condenser, wherein the input side of the condenser is connected to the gas outlet side of the oil separator; an evaporator, wherein the input side of the evaporator is connected to the output side of the condenser; and the output side of the evaporator is connected to the suction side of the compressor; A throttle valve, wherein the throttle valve is arranged on a connecting pipe between the condenser and the evaporator; An oil circulation meter, the oil circulation meter is arranged on a connecting pipe between the condenser and the evaporator; A temperature sensor, the temperature sensor being arranged on a pipeline of the oil circulation test framework and being used for measuring temperature; A pressure sensor, the pressure sensor being arranged on a pipeline of the oil circulation test framework and being used for measuring pressure; A flow meter is provided on a pipeline of the oil circulation test framework and is used for measuring flow rate.

11. The oil circulation test framework according to claim 10, characterized in that: The oil circulation test framework also includes: An oil pump, wherein the first oil return control valve is connected to the oil separator through the oil pump.

12. The oil circulation test framework according to claim 10, characterized in that: The oil circulation test framework also includes: An oil collecting tank, wherein the oil separator is connected to the first oil return control valve through the oil collecting tank.

13. The oil circulation test framework according to claim 10, characterized in that: The oil circulation test framework also includes: A temperature control device, wherein the temperature control device is arranged on a pipeline between the oil separator and the first oil return control valve; the temperature control device is used to regulate the lubricating oil flowing out of the oil separator to a set oil return temperature.

14. The oil circulation test framework according to any one of claims 10 to 13, characterized in that: The oil circulation test framework also includes: A second oil return control valve, the oil collecting side of the oil separator is connected to the condenser through the second oil return control valve.

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