Test method for compressor oil circulation, oil circulation test architecture

Abstract

The application relates to the technical field of compressor testing, and discloses a testing method for oil circulation of a compressor and an oil circulation testing framework. The testing method comprises the following steps: placing the oil circulation testing framework in a set environment temperature; adjusting a first oil return control valve to place a first testing branch of the oil circulation testing framework in a set first oil circulation rate; the first testing branch is a connecting pipeline between an oil collection side of an oil separator and a suction side of the compressor; adjusting the compressor according to a set first compressor rotating speed and adjusting a throttle valve according to a set first valve opening degree; after the compressor and the throttle valve are adjusted for a preset time length, measuring the operating parameters of a device to be tested in the oil circulation testing framework by using a testing device; the device to be tested comprises the compressor, a condenser, the throttle valve and an evaporator; and the performance of the oil circulation testing framework is displayed according to the operating parameters. In this way, by continuously adjusting the rotating speed of the compressor and the valve opening degree of the throttle valve under the conditions of different set environment temperatures and set first oil circulation rates, the parameter change conditions of the device to be tested in the oil circulation testing framework can be monitored, and then the user can analyze the parameter change conditions to know the performance of the oil circulation testing framework in all aspects, so as to improve the operating performance of an actually used refrigeration system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressor testing, and particularly relates to a test method for oil circulation of a compressor and an oil circulation test framework. BACKGROUND

[0002] At present, an oil separator is arranged in a compressor, but the size and structure of the built-in oil separator are limited due to the limited internal space of the compressor, which leads to insufficient separation efficiency of the oil separator, and more lubricating oil enters the refrigeration system, which may cause insufficient oil return of the compressor and damage under some extreme special conditions. 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 arranged 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 an oil return circuit. However, after changing the oil return structure, the user does not know under what operating conditions the performance of the compressor is optimal, and thus the performance of the entire refrigeration system is optimal. Therefore, how to test the new refrigeration system in order to optimize the parameters of the actual refrigeration system needs to be solved.

[0003] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present application, and thus can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0004] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an overall description of the application, nor is it intended to identify key / important elements or delineate the scope of the embodiments, but to serve as a prelude to the detailed description below.

[0005] The embodiments of the present application provide a test method for oil circulation of a compressor and an oil circulation test framework, so as to improve the performance of a refrigeration system.

[0006] The embodiment of the present application provides a kind of compressor oil circulation test method, it is applied to oil circulation test architecture, the oil circulation test architecture includes: compressor, with the oil separator of the exhaust side of the compressor, the first oil return control valve between the oil collection side of the oil separator and the suction side of the compressor is connected, condenser, throttle valve, evaporator are sequentially connected between the gas side of the oil separator and the suction side of the compressor, test device is set on the pipeline of the test architecture;Test method includes: make the oil circulation test architecture be placed in set environmental temperature;Adjust the first oil return control valve to make the first test branch of the oil circulation test architecture be placed in set first oil circulation rate;The first test branch is the connecting pipeline between the oil collection side of the oil separator and the suction side of the compressor;According to the first compressor speed of set, the compressor is adjusted, and according to the first valve opening of set, the throttle valve is adjusted;After adjusting the compressor and the throttle valve for a predetermined period of time, the operating parameters of the device to be tested in the oil circulation test architecture are measured using the test device;The device to be tested includes the compressor, the condenser, the throttle valve, the evaporator;According to the operating parameters, the performance of the oil circulation test architecture is displayed.

[0007] In the above embodiment, by continuously adjusting the speed of the compressor and the valve opening of the throttle valve under different set environmental temperatures and set first oil circulation rates, the parameter change of the device to be tested in the oil circulation test architecture can be monitored, and then the user can analyze the parameter change to obtain the performance of the oil circulation test architecture in all aspects, and then the user can adjust the control parameters in the actual use refrigeration system corresponding to the oil circulation test architecture to improve the operating performance of the actual use refrigeration system.

[0008] Further, the oil circulation test architecture further includes: an oil pump, the oil pump is arranged between the oil collection side of the oil separator and the first oil return control valve;Adjusting the first oil return control valve to make the first test branch of the oil circulation test architecture be placed in set first oil circulation rate includes: adjusting the first oil return control valve and the oil pump to make the first test branch of the oil circulation test architecture be placed in set first oil circulation rate.

[0009] In the above embodiment, by arranging the oil pump between the oil collection side of the oil separator and the first oil return control valve, the set first oil circulation rate is adjusted by the oil pump and the first oil return control valve, even if one of the devices has a problem, the oil circulation test architecture can be adjusted to the set first oil circulation rate, so that the fault tolerance of the oil circulation test architecture is higher.

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

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

[0012] Further, the operating parameters include refrigerant flow, suction temperature of the compressor, discharge temperature of the compressor, suction pressure of the compressor and discharge pressure of the compressor; the performance of the oil circulation test architecture includes the performance of the compressor; and 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, 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 discharge temperature of the compressor, the suction pressure of the compressor and the discharge 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, by measuring the parameters such as refrigerant flow, suction temperature of the compressor, discharge temperature of the compressor, suction pressure of the compressor and discharge pressure of the compressor, the volumetric efficiency and the isentropic efficiency of the compressor can be calculated, and the performance of the compressor in the oil circulation test architecture can be intuitively viewed by the user through the volumetric efficiency and the isentropic efficiency of the compressor, so as to facilitate the user to improve the control parameters in the actual used refrigeration system, and improve the performance of the refrigeration system.

[0014] Further, the operation 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; the first pipe is a pipe connected to the oil circulation test architecture; the second pipe is a pipe in heat exchange with the first pipe; the performance of the oil circulation test architecture includes the heat exchange performance of the heat exchange device; and the performance of the oil circulation test architecture is displayed according to the operation 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 first pipe inlet temperature of the condenser, the first pipe outlet temperature of the condenser, and the second pipe inlet temperature of the condenser can reflect the heat exchange efficiency of the condenser; and 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 can reflect the heat exchange efficiency of the evaporator. The heat exchange efficiency of the condenser and the heat exchange efficiency of the evaporator can facilitate the user to intuitively view the performance of the condenser and the evaporator in the oil circulation test architecture, and further facilitate the user to improve the control parameters of the actual use of the refrigeration system to improve the performance of the refrigeration system.

[0016] Further, before the oil circulation test architecture is placed in the set environment temperature, the method further includes: injecting a set amount of lubricating oil into the compressor; and triggering the oil circulation test architecture to run at the set environment temperature, the set second compressor speed, the set supercooling degree, and the set superheating degree until the oil circulation test architecture runs stably.

[0017] In the above embodiment, the oil circulation test architecture is run before the test to make the oil circulation test architecture run stably. The test parameter error caused by the unstable running of the oil circulation test architecture can be avoided, and the obtained operation parameters of each device in the oil circulation test architecture are more accurate.

[0018] Further, the test device includes a temperature sensor and / or a pressure sensor; and the determination of whether the oil circulation test architecture runs stably includes: obtaining a plurality of to-be-evaluated parameters at intervals of a preset time period; the to-be-evaluated parameters include temperature values measured by the temperature sensor and / or pressure values measured by the pressure sensor; and the oil circulation test architecture is determined to run stably in a case where the values of the plurality of to-be-evaluated parameters change within a preset range.

[0019] In the above embodiment, the temperature value measured by the temperature sensor changes little in a period of time, or the pressure value measured by the pressure sensor changes little in a period of time, which reflects that each parameter in the oil circulation test architecture tends to be stable, and at this time, it is beneficial to obtain stable values. Therefore, the change of the temperature value and the change of the pressure value can be used to conveniently and accurately determine whether the oil circulation test architecture is stably operated.

[0020] Further, the compressor oil circulation test method further comprises: triggering the temperature control device to operate during the trial operation, and reading the temperature value of the temperature control device; and in the case that the temperature value changes, confirming that the temperature control device is normally operated.

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

[0022] Further, the oil circulation test architecture further comprises: the oil collection side of the oil separator is connected with the condenser through a second oil return control valve; before the compressor is adjusted at the set first compressor rotating speed, the compressor oil circulation test method further comprises: adjusting the second oil return control valve to set the second test branch of the oil circulation test architecture at a set second oil circulation rate; and the second test branch is a connecting pipeline between the gas outlet side of the oil separator and the suction side of the compressor.

[0023] In the above embodiment, by continuously adjusting the rotating speed of the compressor and the valve opening degree of the throttle valve under the conditions of the set different ambient temperatures, the set first oil circulation rate and the set second oil circulation rate, the parameter change of the device to be tested in the oil circulation test architecture can be monitored, and then the user can analyze the parameter change to obtain the performance of the oil circulation test architecture in all aspects, and then the user can adjust the control parameters in the actual used refrigeration system corresponding to the oil circulation test architecture, so as to improve the operating performance of the actual used refrigeration system.

[0024] The embodiment of the present application provides an oil circulation test architecture, comprising: a compressor; an oil separator, an exhaust port of the compressor being connected with an input side of the oil separator; a first oil return control valve, an oil collection side of the oil separator being connected with a suction side of the compressor through the first oil return control valve; a condenser, an input side of the condenser being connected with an air outlet side of the oil separator; an evaporator, an input side of the evaporator being connected with an output side of the condenser; the output side of the evaporator being connected with the suction side of the compressor; a throttle valve, the throttle valve being arranged on a connecting pipeline of the condenser and the evaporator; an oil circulation meter, the oil circulation meter being arranged on the connecting pipeline of the condenser and the evaporator; a temperature sensor, the temperature sensor being arranged on a pipeline of the oil circulation test architecture and being used for measuring temperature; a pressure sensor, the pressure sensor being arranged on the pipeline of the oil circulation test architecture and being used for measuring pressure; a flow meter, the flow meter being arranged on the pipeline of the oil circulation test architecture and being used for measuring flow.

[0025] In the above embodiment, by designing the oil circulation test architecture which is suitable for the actual running refrigeration system, and arranging the temperature sensor, the pressure sensor, the flow meter and the oil circulation meter for measuring parameters on the oil circulation test architecture, the user can understand the running parameters of each device under different control parameters, so as to automatically understand the performance of each device.

[0026] Further, the oil circulation test architecture further comprises: an oil pump, the first oil return control valve being connected with the oil separator through the oil pump.

[0027] In the above embodiment, considering that there is an oil pump in part of the refrigeration system, by arranging the oil pump, the running parameters of each device measured can be more suitable for the parameters in the actual running refrigeration system.

[0028] Further, the oil circulation test architecture further comprises: an oil collection cabin, the oil separator being connected with the first oil return control valve through the oil collection cabin.

[0029] In the above embodiment, by arranging the oil collection cabin, the running parameters of each device measured can be more suitable for the parameters in the actual running refrigeration system.

[0030] Further, the oil circulation test architecture further comprises: a temperature control device, the temperature control device being arranged on a pipeline between the oil separator and the first oil return control valve; the temperature control device being used for regulating the lubricating oil flowing out of the oil separator to a set oil return temperature.

[0031] In the above embodiment, by setting the temperature control device, the lubricating oil flowing out of the oil separator can reach the set oil return temperature, thereby facilitating the reaction of different oil return temperatures on the performance of each device in the oil circulation test architecture.

[0032] Further, the oil circulation test architecture further comprises a second oil return control valve, and the oil collection side of the oil separator is connected with the condenser through the second oil return control valve.

[0033] In the above embodiment, considering that when the oil separator is not separately provided, the lubricating oil mixed in the refrigerant discharged from the exhaust side of the compressor will enter the condenser along with the refrigerant, therefore by setting the second oil return control valve, the performance of the oil circulation test architecture under different operating conditions when the oil separator is not provided can be simulated and tested at the same time.

[0034] The foregoing general description and the following description are only exemplary and explanatory, and are not used to limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0035] One or more embodiments are exemplarily illustrated by the corresponding drawings, which do not constitute a limitation on the embodiments, and elements with the same reference numerals in the drawings are considered as similar elements, the drawings do not constitute a proportional limitation, and wherein:

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

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

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

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

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

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

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

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

[0044] Reference signs:

[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 enable a more detailed understanding of the features and technical content of the embodiments of the present application, the implementation of the embodiments of the present application will be described in detail below, and the attached drawings are only used for reference and do not limit the embodiments of the present application. In the following technical description, in order to facilitate explanation, through multiple details, a sufficient understanding of the disclosed embodiments is provided. However, one or more embodiments can still be implemented without these details. In other cases, in order to simplify the drawings, well-known structures and devices can be simplified.

[0047] The terms "first", "second", and the like in the specification and claims of the embodiments of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the embodiments of the present application described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0048] Unless otherwise specified, the term "a plurality of" means two or more.

[0049] The term "corresponding" can refer to an association or binding relationship. A and B correspond to each other means that there is an association or binding relationship between A and B.

[0050] In 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 with the oil separator 2; the oil separator 2 is connected with the suction side of the compressor 1 through the first oil return control valve 6; the input side of the condenser 8 is connected with the oil separator 2; the input side of the evaporator 11 is connected with the output side of the condenser 8; the output side of the evaporator 11 is connected with the suction side of the compressor 1; the throttle valve 10 is arranged on the connecting pipeline of the condenser 8 and the evaporator 11.

[0051] Among them, the refrigeration system further includes: an oil pump 4. One end of the oil pump 4 is connected with the oil separator 2, and the other end of the oil pump 4 is connected with 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 through the oil collecting tank 3.

[0053] Embodiment one

[0054] In combination Figure 2 As shown in the drawings, the oil circulation test architecture provided in the embodiments of the present application comprises a compressor 1, an oil separator 2, a first oil return control valve 6, a condenser 8, an evaporator 11, a throttling valve 10, an oil circulation meter 9, a temperature sensor 12, a pressure sensor 13 and a flow meter 7. 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 throttling valve 10 is arranged on the connecting pipeline of the condenser 8 and the evaporator 11. The oil circulation meter 9 is arranged on the connecting pipeline of the condenser 8 and the evaporator 11. The temperature sensor 12 is arranged on the pipeline of the oil circulation test architecture for measuring temperature. The pressure sensor 13 is arranged on the pipeline of the oil circulation test architecture for measuring pressure. The flow meter 7 is arranged on the pipeline of the oil circulation test architecture for measuring flow.

[0055] In combination Figure 2 As shown in the drawings, in some embodiments, the oil circulation test architecture further comprises 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 architecture further comprises 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] For example, 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] In combination Figure 3 As shown in the drawings, in some embodiments, the oil circulation test architecture further comprises 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 regulate the lubricating oil flowing out of the oil separator 2 to a set oil return temperature.

[0059] For example, 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] In combination Figure 4As shown, in some embodiments, the oil circulation test architecture further comprises: a second oil return control valve 14. The oil collection side of the oil separator 2 is connected with the condenser 8 through the second oil return control valve 14.

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

[0062] In some embodiments, multiple temperature sensors 12 and multiple pressure sensors 13 can be provided. For example, one temperature sensor 12 and one pressure sensor 13 can be provided on the pipeline between the throttle valve 10 and the condenser 8, and one temperature sensor 12 and one pressure sensor 13 can be provided on the pipeline between the evaporator 11 and the compressor 1. At this time, the supercooling degree of the system can be determined by the values of the temperature sensor 12 and the pressure sensor 13 provided on the pipeline between the throttle valve 10 and the condenser 8. The superheating degree of the system can be determined by the values of the temperature sensor 12 and the pressure sensor 13 provided on the pipeline between the evaporator 11 and the compressor 1.

[0063] For example, the supercooling degree can be calculated by: finding the first saturation temperature corresponding to the outlet pressure of the condenser 8 in the preset first saturation temperature database; calculating the outlet temperature of the condenser 8 minus the first saturation temperature to obtain the supercooling degree. 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] For example, the superheating degree can be calculated by: finding the second saturation temperature corresponding to the outlet pressure of the evaporator 11 in the preset second saturation temperature database; calculating the outlet temperature of the evaporator 11 minus the second saturation temperature to obtain the superheating 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 can be provided, for example, one flow meter 7 can be provided on the pipeline between the first oil return control valve 6 and the compressor 1, and one flow meter 7 can also be provided on the pipeline between the condenser 8 and the throttle valve 10.

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

[0067] Embodiment Two

[0068] In combination Figure 5 As shown in the embodiments of the present application, a test method for compressor oil circulation is provided, which is applied to the oil circulation test architecture of Embodiment One. The test method for compressor oil circulation comprises the following steps:

[0069] In step S101, the oil circulation test architecture is placed in a set environment temperature.

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

[0071] In some embodiments, the temperature adjustment device can be triggered to operate to make the environment temperature reach the set environment temperature by arranging a temperature adjustment device in the space where the oil circulation test architecture is placed.

[0072] In the above embodiments, the temperature adjustment device can be an air conditioner. In the case that the environment temperature is less than the set environment temperature, the air conditioner is triggered to start the heating mode. In the case that the environment temperature is greater than the set environment temperature, the air conditioner is triggered to start the cooling mode.

[0073] In step S102, the first return oil control valve is adjusted to make the first test branch of the oil circulation test architecture reach a set first oil circulation rate.

[0074] The first test branch is the connecting pipeline between the oil collection side of the oil separator and the suction side of the compressor.

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

[0076] In some embodiments, step S102 can also be adjusting the first return oil control valve and the oil pump to make the first test branch of the oil circulation test architecture reach the set first oil circulation rate.

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

[0078] In another example, the set ambient temperature can be obtained, and in the case that the set ambient temperature is less than the set temperature, the first oil return control valve 6 and the oil pump 4 are adjusted to place the first test branch of the oil circulation test architecture in the set first oil circulation rate. In the case that the set ambient temperature is greater than the set temperature, only the first oil return control valve 6 is adjusted to place the first test branch of the oil circulation test architecture in the set first oil circulation rate. In this way, the oil pump of the refrigeration system is set according to the use requirement. Generally, the ambient temperature is associated with the use requirement, and whether to increase the oil pump to participate in the adjustment is determined by the ambient temperature, so that the test is more in line with the actual situation.

[0079] Optionally, the first oil circulation rate of the first test branch is obtained by calculating the refrigerant flow and the flow of the lubricating oil. In an example, the oil circulation rate of the first test branch = the measured flow of the lubricating oil of the first test branch ÷ (the measured flow of the lubricating oil of the first test branch + the refrigerant flow).

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

[0081] The second test branch is a connecting pipeline between the gas outlet side of the oil separator and the suction side of the compressor.

[0082] In an 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. The oil circulation rate of the second test branch can be measured by an oil circulation meter arranged on the second test branch.

[0083] In some embodiments, the test method of the compressor oil circulation further comprises: before adjusting the compressor 1 at the set first compressor speed, adjusting the temperature control device 5 to place the oil circulation test architecture in the set oil return temperature.

[0084] In an example, a temperature sensor is arranged on the pipeline between the temperature control device 5 and the compressor to measure the actual oil return temperature, and in the case that the actual oil return temperature is lower than the set oil return temperature, the heating temperature of the temperature control device 5 is increased, and in the case that 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, the user can understand the influence of the oil return temperature on the oil circulation test architecture, and adjust the control parameters in the actual use refrigeration system corresponding to the oil circulation test architecture to improve the operation performance of the actual use refrigeration system.

[0085] For example, before testing the oil circulation test architecture, i.e. before adjusting the compressor at a set first compressor speed, the first test branch can be set at a set first oil circulation rate, the second test branch can be set at a set second oil circulation rate, and the oil circulation test architecture can be set at a set oil return temperature.

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

[0087] At step S103, the compressor is adjusted at a set first compressor speed, and the throttle valve is adjusted at a set first valve opening.

[0088] It should be understood that when the compressor speed is increased, the refrigeration capacity of the compressor is usually also increased, which means that the refrigeration system needs to handle more refrigerant to provide sufficient refrigeration capacity. Therefore, in order to balance the refrigeration capacity and the refrigeration demand, the valve opening of the throttle valve is usually increased with the compressor speed. The compressor speed to be tested and the valve opening corresponding to the compressor speed to be tested can be set in advance and saved in a preset test database. When testing is needed, the compressor speed to be tested is directly read from the test database as the first compressor speed, and the valve opening corresponding to the first compressor speed is directly read as the first valve opening.

[0089] It should be noted that the same compressor speed can correspond to multiple valve openings. Each set of compressor speed and valve opening should be tested when testing and adjusting.

[0090] At step S104, after adjusting the compressor and the throttle valve for a preset time, the operating parameters of the devices to be tested in the oil circulation test architecture are measured by the test device.

[0091] The devices to be tested include the compressor, the condenser, the throttle valve, and the evaporator.

[0092] In some embodiments, if one 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, the throttle valve 10 is adjusted, i.e. the compressor 1 and the throttle valve 10 are adjusted.

[0093] It should be noted that after the compressor speed of the compressor 1 and the opening of the throttle valve 10 are changed, a certain time is needed for the test architecture to reach a stable state. By adjusting the compressor 1 and the throttle valve 10 for a preset time and then obtaining the operating parameters of the devices, the obtained operating parameters of the devices can be more accurate. The value of the preset time can be set by an engineer according to experience, for example, 2 minutes, 5 minutes, etc.

[0094] In some embodiments, the device under test further comprises 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] For example, the operating parameters of the device under test in the oil circulation test architecture include: suction pressure of compressor 1, discharge pressure of compressor 1, suction temperature of compressor 1, discharge temperature of compressor 1, input voltage of compressor 1, working current of compressor 1, output power of compressor 1, refrigerant flow, pipe inlet temperature of condenser 8, pipe outlet temperature of condenser 8, flow of condenser 8, pipe inlet temperature of evaporator 11, pipe outlet temperature of evaporator 11, flow of evaporator 11, inlet pressure of throttle valve 10, inlet temperature of throttle valve 10, inlet temperature of temperature control device 5, outlet temperature of temperature control device 5, lubricating oil flow, rotating speed of oil pump 4, second valve opening degree of first oil return control valve 6, oil amount of oil collecting tank 3, third valve opening degree of second oil return 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 medium to be heated. Therefore, for the condenser, the evaporator and the temperature control device, the pipe inlet temperature and the pipe outlet temperature of the two pipes can be measured respectively. The first pipe is the pipe for flowing through the medium to be heated, that is, the pipe in the heat exchanger connected to the refrigerant flow in the refrigeration system, that is, the pipe in the heat exchanger connected to the oil circulation test architecture. The second pipe is the pipe for flowing through the heat exchange medium, that is, the pipe for heat exchange with the first pipe. For example, the first pipe of the condenser, that is, the pipe for flowing through the medium to be heated in the condenser. The second pipe of the condenser, that is, the pipe for flowing through the heat exchange medium in the condenser. The first pipe of the evaporator, that is, the pipe for flowing through the medium to be heated in the evaporator. The second pipe of the evaporator, that is, the pipe for flowing through the heat exchange medium in the evaporator.

[0097] In step S105, the performance of the oil circulation test architecture is displayed according to the operating parameters.

[0098] In some embodiments, the operating parameters include: refrigerant flow, suction temperature of compressor, discharge temperature of compressor, suction pressure of compressor, discharge pressure of compressor; the performance of the oil circulation test architecture includes: performance of the compressor; step S104 can include: determining volumetric efficiency of the compressor according to the refrigerant flow, the suction temperature of the compressor and the suction pressure of the compressor; determining isentropic efficiency of the compressor according to the suction temperature of the compressor, the discharge temperature of the compressor, the suction pressure of the compressor and the discharge pressure of the compressor; displaying the performance of the compressor according to the volumetric efficiency and the isentropic efficiency.

[0099] In one embodiment described above, determining the compressor's volumetric efficiency based on the refrigerant flow rate, compressor suction temperature, and compressor suction pressure can be achieved by: looking up the density in a preset thermal property table using the compressor's suction temperature and suction pressure; and calculating M. ref =h×n×ρ1×t,η1=M r / M ref Where ρ1 is 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, and M r For refrigerant flow, M ref For mass flow rate.

[0100] In one embodiment described above, determining the isentropic efficiency of the compressor based on its suction temperature, discharge temperature, suction pressure, and discharge pressure can be achieved by: finding the compressor's inlet enthalpy and entropy value in a preset thermal property table using the compressor's suction temperature and suction pressure; finding the compressor's outlet enthalpy in a preset thermal property table using the compressor's discharge temperature and discharge pressure; finding the compressor's isentropic discharge temperature in a preset thermal property table using the compressor's entropy value and discharge pressure; and finding the compressor's post-compression enthalpy in a preset thermal property table using the isentropic discharge temperature and discharge pressure. The isentropic efficiency of the compressor is then calculated as η2 = (h5' - h6) / (h5 - h6). Here, η2 is the compressor's isentropic efficiency, h5' is the compressor's post-compression enthalpy, h6 is the compressor's inlet enthalpy, and h5 is the compressor's outlet enthalpy.

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

[0102] For example, the volumetric efficiency at different oil circulation rates can be plotted as a volumetric efficiency trend chart, such as... Figure 6 As shown, the horizontal axis represents the oil circulation rate (OCR), and the vertical axis represents the volumetric efficiency. An isentropic efficiency trend chart can be generated for different oil circulation rates, as shown below. Figure 7 As shown, the horizontal axis represents the oil circulation rate, and the vertical axis represents the isentropic efficiency. The oil circulation rate on the horizontal axis can be set to the oil circulation rate of the first test branch or the oil circulation rate of the second test branch, depending on the testing requirements.

[0103] In some embodiments, 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, a first pipe inlet temperature of the evaporator; and the performance of the oil circulation test architecture includes: heat exchange performance of the heat exchange device. Step S104 can include: determining 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 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 embodiments, 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 can be: calculating 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 embodiments, 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 can be: calculating 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 embodiments, 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 can include: forming a condenser efficiency trend chart of the heat exchange efficiency of the condenser measured by different first compressor speeds and first valve opening degrees; and forming an evaporator efficiency trend chart of the heat exchange efficiency of the evaporator measured by different first compressor speeds and first valve opening degrees.

[0107] For example, the heat exchange efficiency of the condenser (Cond) at different oil circulation rates can be formed into a condenser efficiency trend chart, as shown in Figure 8 As shown, the abscissa is the oil circulation rate, and the ordinate is the heat exchange efficiency of the condenser.

[0108] For the convenience of users, one or more of the volumetric efficiency trend chart, the isentropic efficiency trend chart, the condenser performance trend chart, and the evaporator performance trend chart can be fused into one chart for display.

[0109] In some 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 throttling valve 10, the inlet pressure of the throttling valve 10, the first pipe outlet temperature of the evaporator 11, the first pipe outlet pressure of the evaporator 11, the refrigerant flow rate; the performance of the oil circulation test architecture includes: the heat exchange performance of the heat exchange device; the step S104 can 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 throttling valve 10, the inlet pressure of the throttling 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 8 and the heat exchange performance of the evaporator 11.

[0110] In the above embodiments, the heat exchange performance of the condenser 8 can be 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: calculating QE1 = Mr x (he1-he2). Wherein, 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] Wherein, 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 thermophysical 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 thermophysical 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 thermophysical 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 embodiments, the heat exchange performance of the evaporator 11 can be determined according to the inlet temperature of the throttling valve 10, the inlet pressure of the throttling 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, which can be: calculating QE2 = Mr x (he4-he3). Wherein, 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 a preset thermophysical table. The enthalpy of the outlet refrigerant of the evaporator 11 can be found by using the first pipe outlet temperature of the evaporator 11 and the first pipe outlet pressure of the evaporator 11 in the preset thermophysical table. The preset thermophysical table stores the corresponding relationship among 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 preset thermophysical table also stores the corresponding relationship among the first pipe outlet temperature of the evaporator 11, the first pipe outlet pressure 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 condenser and the heat exchange performance of the evaporator are used to display the heat exchange performance of the heat exchange device. The heat exchange performance of the condenser calculated based on the operating parameters measured at different first compressor speeds and different first valve opening degrees can be used to form a condenser performance trend chart. The heat exchange performance of the evaporator calculated based on the operating parameters measured at different first compressor speeds and different first valve opening degrees can be used to form an evaporator performance trend chart.

[0115] In some embodiments, before the oil circulation test architecture is placed in the set environment temperature, the method further comprises: injecting a set amount of lubricating oil into the compressor 1; and triggering the oil circulation test architecture to run at the set environment temperature, the set second compressor speed, the set supercooling degree and the set superheating degree until the oil circulation test architecture runs stably.

[0116] In the above embodiment, the set amount of lubricating oil can be set by an engineer according to experience to ensure that the compressor 1 can run normally. The set amount of lubricating oil can be injected into the compressor 1 by the engineer or can be injected into the compressor 1 by the manufacturer in advance.

[0117] In the above embodiment, the test device comprises a temperature sensor and / or a pressure sensor. The determination of whether the oil circulation test architecture runs stably comprises: obtaining a plurality of to-be-evaluated parameters at intervals of a preset time period; the to-be-evaluated parameters comprise a temperature value measured by the temperature sensor 12 and / or a pressure value measured by the pressure sensor 13; and in a case where the values of the plurality of to-be-evaluated parameters change within a preset range, it is determined that the oil circulation test architecture runs stably.

[0118] It can be understood that the preset range can comprise a preset temperature change range and / or a preset pressure change range. In a case where the to-be-evaluated parameter is a temperature value, it is evaluated whether the value change of the temperature value is within the preset temperature change range. In a case where the to-be-evaluated parameter is a pressure value, it is evaluated whether the value change of the pressure value is within the preset pressure change range.

[0119] For example, the preset time period is 30 seconds, the temperature value A measured by the temperature sensor 12 and the pressure value B of the pressure sensor 13 are obtained, after 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 using the temperature value C minus the temperature value A. The pressure change value is obtained by using the pressure value D minus the pressure value B. In the case that the temperature change value is in the preset temperature change range and the pressure change value is in the preset pressure change range, it is determined that the oil circulation test architecture is stably operated.

[0120] In the above embodiment, during the commissioning process, the temperature control device 5 can also be triggered to operate, and the temperature value of the temperature control device 5 is read; in the case that the temperature value of the temperature control device 5 changes, it is confirmed that the temperature control device 5 is normally operated.

[0121] In some embodiments, before the oil circulation test architecture is placed in the condition of the set environment temperature and the set oil circulation rate, it can also include: the pipeline of the oil circulation test architecture is subjected to vacuumizing and pressure maintaining treatment, after the air tightness requirement is met, the refrigerant is filled, and the specific value of the refrigerant is recorded.

[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. Then, according to the above-mentioned method, the temperature value A measured by the temperature sensor 12 and the pressure value B of the pressure sensor 13 are obtained, after 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 using the temperature value C minus the temperature value A. The pressure change value is obtained by using the pressure value D minus the pressure value B. In the case that the temperature change value is in the preset temperature change range and the pressure change value is in the preset pressure change range, it is determined that the oil circulation test architecture is stably operated. Figure 1The oil circulation test architecture shown installs the device and the sensor in place. The oil circulation test architecture is subjected to vacuumizing and pressure maintaining treatment, after meeting the air tightness requirement, the refrigerant is filled, and the value of the refrigerant is recorded. The test environment is started, and the test run is carried out according to the environmental temperature of 38℃, the compressor 1 rotation speed of Max x 80% rpm (revolutions per minute), the supercooling degree of 10K (thermodynamic temperature unit), the superheating degree of 5K, the exhaust pressure of 1.5 MPa (megapascal), and the suction pressure of 0.3 MPa, until the oil circulation test architecture is stably operated. Wherein, Max is the rated maximum rotation speed of the compressor. During the test run, the oil pump 4 and the first oil return control valve 6 are not operated. The temperature control device 5 is triggered to operate, and the temperature value of the temperature control device 5 is read, in the case that the temperature value changes, it is confirmed that the temperature control device 5 operates normally, and in the case that the temperature value does not change, it is confirmed that the temperature control device 5 does not operate normally. After the test run is completed, the oil circulation test architecture is stopped for 15 minutes. Then, the compressor 1 rotation speed to be tested and the valve opening degree corresponding to the compressor 1 rotation speed are obtained; the oil circulation test architecture is placed in the condition of the set environmental temperature and the set oil circulation rate, the compressor 1 is adjusted according to the compressor 1 rotation speed, and the throttle valve 10 is adjusted according to the valve opening degree; after the compressor 1 and the throttle valve 10 are adjusted for a preset time, the operating parameters of each device in the oil circulation test architecture are obtained; the performance of the device is determined according to the operating parameters. Then, the oil circulation test architecture is placed in the condition of the set environmental temperature, the set oil circulation rate and the set oil return temperature, the compressor 1 is adjusted again according to the compressor 1 rotation speed, and the throttle valve 10 is adjusted according to the valve opening degree; after the compressor 1 and the throttle valve 10 are adjusted for a preset time, the operating parameters of the compressor, the condenser, the throttle valve, the evaporator and other devices in the oil circulation test architecture 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. In this way, the user can intuitively view the change of the operating parameters.

[0124] The technical scheme of the embodiments of the present application can be embodied in the form of a software product. The computer software product is stored in a storage medium, and includes one or more instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in the embodiments of the present application. The storage medium described above can be a non-transitory storage medium, including a U disk, a mobile hard disk, a read-only memory, a random access memory, a magnetic disk or an optical disk, etc. various media that can store program codes, or can be a transitory storage medium.

[0125] In the embodiments provided by the present application, it should be understood that the disclosed device and method can be implemented in other manners. The embodiments described above are merely exemplary, for example, the division of the units is only a logical function division, and there can be another division manner in actual implementation, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed.

[0126] The above only describes some embodiments of the present application, and is not used to limit the protection scope of the present application. For those skilled in the art, the present application can have various modifications and changes. 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. Meanwhile, the above embodiments can be combined with each other in the case of no conflict, to form new embodiments.

Claims

1. A test method for compressor oil circulation, characterized in that, An oil circulation test architecture is applied, comprising: a compressor, an oil separator connected to the discharge side of the compressor, a first oil return control valve connected between the oil collection side of the oil separator and the suction side of the compressor, a condenser, a throttle valve, and an evaporator sequentially connected between the outlet side of the oil separator and the suction side of the compressor, and a test device disposed on the pipeline of the oil circulation test architecture; the method includes: The oil circulation test architecture was placed at a set ambient temperature. Adjust the first oil return control valve to set the first test branch of the oil circulation test architecture to a set first oil circulation rate; the first test branch is the connecting pipe between the oil collection side of the oil separator and the suction side of the compressor; The compressor is adjusted according to the set first compressor speed, and the throttle valve is adjusted according to the set first valve opening. After adjusting the preset duration of the compressor and the throttle valve, the operating parameters of the device under test in the oil circulation test architecture are measured using the testing device; 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 based on the operating parameters. The oil circulation test architecture further includes: the oil collection side of the oil separator is connected to the condenser via a second oil return control valve; before adjusting the compressor according to the set first compressor speed, the method further includes: Adjust the second return oil control valve to set the second test branch of the oil circulation test architecture to the set second oil circulation rate; the second test branch is the connecting pipe between the outlet side of the oil separator and the suction side of the compressor.

2. The method according to claim 1, characterized in that, The oil circulation test architecture further includes: an oil pump, which is disposed between the oil collection side of the oil separator and the first return oil control valve; adjusting the first return oil control valve to place the first test branch of the oil circulation test architecture at a set first oil circulation rate includes: Adjust the first return oil 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.

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 installed on the pipeline between the oil collection 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 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 reach the set oil return temperature.

4. The method according to claim 1, characterized in that, The operating parameters include: refrigerant flow rate, compressor suction temperature, compressor discharge temperature, compressor suction pressure, and compressor discharge pressure. The performance of the oil circulation test architecture includes: compressor performance. The performance of the oil circulation test architecture is demonstrated based on the operating parameters, including: The volumetric efficiency of the compressor is determined based on the refrigerant flow rate, the compressor suction temperature, and the compressor suction pressure. The isentropic efficiency of the compressor is determined based on the compressor's intake temperature, discharge temperature, intake pressure, and discharge pressure. The performance of the compressor is demonstrated based on the volumetric efficiency and the isentropic efficiency.

5. The method according to claim 1, characterized in that, The operating parameters include: the inlet temperature of the first pipe of the condenser, the outlet temperature of the first pipe of the condenser, the inlet temperature of the second pipe of the condenser, 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; wherein, the first pipe is the pipe connected to the oil circulation test architecture; the second pipe is the pipe that exchanges heat with the first pipe; the performance of the oil circulation test architecture includes: the heat exchange performance of the heat exchange devices; the performance of the oil circulation test architecture is demonstrated according to the operating parameters, including: The heat exchange efficiency of the condenser is determined based on the inlet temperature of the first pipe, the outlet temperature of the first pipe, and the inlet temperature of the second pipe. The heat exchange efficiency of the evaporator is determined based on the inlet temperature of the second pipe, the outlet temperature of the second pipe, and the inlet temperature of the first pipe. The heat exchange performance of the heat exchange device is demonstrated based on 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, Placing the oil circulation test architecture at a set ambient temperature also includes: Inject the set amount of lubricating oil into the compressor; The oil circulation test architecture is triggered to run under the set ambient temperature, set second compressor speed, set subcooling and set superheat until the oil circulation test architecture runs stably.

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

8. The method according to claim 6, characterized in that, The method further includes: During the trial operation, the temperature control device is triggered to operate, and the temperature value of the temperature control device is read. If the temperature value changes, confirm that the temperature control device is operating normally.

9. An oil circulation test architecture, characterized in that, The oil circulation test architecture, employing the method described in any one of claims 1 to 8, comprises: compressor; An oil separator, wherein the discharge port of the compressor is connected to the input side of the oil separator; The first oil return control valve connects the oil collection side of the oil separator to the suction side of the compressor. A condenser, wherein the input side of the condenser is connected to the outlet side of the oil separator; An evaporator, the input side of which 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 throttling valve is provided on the connecting pipe between the condenser and the evaporator; An oil circulation meter is installed on the connecting pipe between the condenser and the evaporator; A temperature sensor, which is installed on the pipe of the oil circulation test structure, is used to measure the temperature; A pressure sensor, which is installed on the pipeline of the oil circulation test architecture, is used to measure pressure; A flow meter, which is installed on the pipeline of the oil circulation test architecture, is used to measure the flow rate; The oil circulation test architecture also includes a second oil return control valve, through which the oil collection side of the oil separator is connected to the condenser.

10. The oil circulation test architecture according to claim 9, characterized in that, The oil circulation test architecture also includes: An oil pump is provided, and the first return oil control valve is connected to the oil separator via the oil pump.

11. The oil circulation test architecture according to claim 9, characterized in that, The oil circulation test architecture also includes: The oil separator is connected to the first return oil control valve through the oil collection tank.

12. The oil circulation test architecture according to claim 9, characterized in that, The oil circulation test architecture also includes: A temperature control device is installed on the pipeline between the oil separator and the first return oil control valve; the temperature control device is used to regulate the lubricating oil flowing out of the oil separator to the set return oil temperature.

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